C********************************************************************* C********************************************************************* C* ** C* February 1990 ** C* ** C* The Lund Monte Carlo for Hadronic Processes ** C* ** C* PYTHIA version 5.3 ** C* ** C* Hans-Uno Bengtsson ** C* Department of Theoretical Physics, University of Lund ** C* Solvegatan 14A, S-223 62 Lund, Sweden ** C* INTERNET address HANSUNO@THEP.LU.SE ** C* BITNET address THEPHUB@SELDC52 ** C* Tel. +46 - 10 48 16 ** C* Department of Physics, UCLA ** C* 405 Hilgard Avenue, Los Angeles, CA 90024, USA ** C* BITNET address GOLLUM@UCLAHEP ** C* Tel. +213 - 825 - 5672 ** C* ** C* Torbjorn Sjostrand ** C* CERN/TH, CH-1211 Geneva 23 ** C* BITNET/EARN address TORSJO@CERNVM ** C* Tel. +22 - 767 28 20 ** C* ** C* Copyright Hans-Uno Bengtsson and Torbjorn Sjostrand ** C* ** C********************************************************************* C********************************************************************* C * C List of subprograms in order of appearance, with main purpose * C (S = subroutine, F = function, B = block data) * C * C S PYINIT to administer the initialization procedure * C S PYTHIA to administer the generation of an event * C S PYSTAT to print cross-section and other information * C S PYINKI to initialize kinematics of incoming particles * C S PYINRE to initialize treatment of resonances * C S PYXTOT to give total, elastic and diffractive cross-sect. * C S PYMAXI to find differential cross-section maxima * C S PYOVLY to select multiplicity of overlayed events * C S PYRAND to select subprocess and kinematics for event * C S PYSCAT to set up kinematics and colour flow of event * C S PYSSPA to simulate initial state spacelike showers * C S PYMULT to generate multiple interactions * C S PYREMN to add on target remnants * C S PYRESD to perform resonance decays * C S PYDIFF to set up kinematics for diffractive events * C S PYFRAM to perform boosts between different frames * C S PYWIDT to calculate full and partial widths of resonances * C S PYKLIM to calculate borders of allowed kinematical region * C S PYKMAP to construct value of kinematical variable * C S PYSIGH to calculate differential cross-sections * C S PYSTFU to evaluate structure functions * C S PYSPLI to find flavours left in hadron when one removed * C F PYGAMM to evaluate ordinary Gamma function Gamma(x) * C F PYW1AU to evaluate auxiliary function W1(s) * C F PYW2AU to evaluate auxiliary function W2(s) * C F PYI3AU to evaluate auxiliary function I3(s,t,u,v) * C F PYSPEN to evaluate Spence (dilogarithm) function Sp(x) * C S PYTEST to test the proper functioning of the package * C B PYDATA to contain all default values * C S PYKCUT to provide dummy routine for user kinematical cuts * C S PYSTFE to provide interface to Tung or user structure func. * C * C********************************************************************* SUBROUTINE PYINIT(FRAME,BEAM,TARGET,WIN) C...Initializes the generation procedure; finds maxima of the C...differential cross-sections to be used for weighting. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/LUDAT4/CHAF(500) CHARACTER CHAF*8 COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/,/LUDAT4/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT5/ CHARACTER*(*) FRAME,BEAM,TARGET CHARACTER CHFRAM*8,CHBEAM*8,CHTARG*8,CHMO(12)*3,CHLH(2)*6 DATA CHMO/'Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep', &'Oct','Nov','Dec'/, CHLH/'lepton','hadron'/ C...Write headers. IF(MSTP(122).GE.1) WRITE(MSTU(11),1000) MSTP(181),MSTP(182), &MSTP(185),CHMO(MSTP(184)),MSTP(183) CALL LULIST(0) WRITE(MSTU(11),1100) C...Identify beam and target particles and initialize kinematics. CHFRAM=FRAME//' ' CHBEAM=BEAM//' ' CHTARG=TARGET//' ' CALL PYINKI(CHFRAM,CHBEAM,CHTARG,WIN) C...Select partonic subprocesses to be included in the simulation. IF(MSEL.NE.0) THEN DO 100 I=1,200 100 MSUB(I)=0 ENDIF IF(MINT(43).EQ.1.AND.(MSEL.EQ.1.OR.MSEL.EQ.2)) THEN C...Lepton+lepton -> gamma/Z0 or W. IF(MINT(11)+MINT(12).EQ.0) MSUB(1)=1 IF(MINT(11)+MINT(12).NE.0) MSUB(2)=1 ELSEIF(MSEL.EQ.1) THEN C...High-pT QCD processes: MSUB(11)=1 MSUB(12)=1 MSUB(13)=1 MSUB(28)=1 MSUB(53)=1 MSUB(68)=1 IF(MSTP(82).LE.1.AND.CKIN(3).LT.PARP(81)) MSUB(95)=1 IF(MSTP(82).GE.2.AND.CKIN(3).LT.PARP(82)) MSUB(95)=1 ELSEIF(MSEL.EQ.2) THEN C...All QCD processes: MSUB(11)=1 MSUB(12)=1 MSUB(13)=1 MSUB(28)=1 MSUB(53)=1 MSUB(68)=1 MSUB(91)=1 MSUB(92)=1 MSUB(93)=1 MSUB(95)=1 ELSEIF(MSEL.GE.4.AND.MSEL.LE.8) THEN C...Heavy quark production. MSUB(81)=1 MSUB(82)=1 DO 110 J=1,MIN(8,MDCY(21,3)) 110 MDME(MDCY(21,2)+J-1,1)=0 MDME(MDCY(21,2)+MSEL-1,1)=1 ELSEIF(MSEL.EQ.10) THEN C...Prompt photon production: MSUB(14)=1 MSUB(18)=1 MSUB(29)=1 ELSEIF(MSEL.EQ.11) THEN C...Z0/gamma* production: MSUB(1)=1 ELSEIF(MSEL.EQ.12) THEN C...W+/- production: MSUB(2)=1 ELSEIF(MSEL.EQ.13) THEN C...Z0 + jet: MSUB(15)=1 MSUB(30)=1 ELSEIF(MSEL.EQ.14) THEN C...W+/- + jet: MSUB(16)=1 MSUB(31)=1 ELSEIF(MSEL.EQ.15) THEN C...Z0 & W+/- pair production: MSUB(19)=1 MSUB(20)=1 MSUB(22)=1 MSUB(23)=1 MSUB(25)=1 ELSEIF(MSEL.EQ.16) THEN C...H0 production: MSUB(3)=1 MSUB(5)=1 MSUB(8)=1 MSUB(102)=1 ELSEIF(MSEL.EQ.17) THEN C...H0 & Z0 or W+/- pair production: MSUB(24)=1 MSUB(26)=1 ELSEIF(MSEL.EQ.21) THEN C...Z'0 production: MSUB(141)=1 ELSEIF(MSEL.EQ.22) THEN C...H+/- production: MSUB(142)=1 ELSEIF(MSEL.EQ.23) THEN C...R production: MSUB(143)=1 ENDIF C...Count number of subprocesses on. MINT(44)=0 DO 120 ISUB=1,200 IF(MINT(43).LT.4.AND.ISUB.GE.91.AND.ISUB.LE.96.AND. &MSUB(ISUB).EQ.1) THEN WRITE(MSTU(11),1200) ISUB,CHLH(MINT(41)),CHLH(MINT(42)) STOP ELSEIF(MSUB(ISUB).EQ.1.AND.ISET(ISUB).EQ.-1) THEN WRITE(MSTU(11),1300) ISUB STOP ELSEIF(MSUB(ISUB).EQ.1.AND.ISET(ISUB).LE.-2) THEN WRITE(MSTU(11),1400) ISUB STOP ELSEIF(MSUB(ISUB).EQ.1) THEN MINT(44)=MINT(44)+1 ENDIF 120 CONTINUE IF(MINT(44).EQ.0) THEN WRITE(MSTU(11),1500) STOP ENDIF MINT(45)=MINT(44)-MSUB(91)-MSUB(92)-MSUB(93)-MSUB(94) C...Maximum 4 generations; set maximum number of allowed flavours. MSTP(1)=MIN(4,MSTP(1)) MSTU(114)=MIN(MSTU(114),2*MSTP(1)) MSTP(54)=MIN(MSTP(54),2*MSTP(1)) C...Sum up Cabibbo-Kobayashi-Maskawa factors for each quark/lepton. DO 140 I=-20,20 VINT(180+I)=0. IA=IABS(I) IF(IA.GE.1.AND.IA.LE.2*MSTP(1)) THEN DO 130 J=1,MSTP(1) IB=2*J-1+MOD(IA,2) IPM=(5-ISIGN(1,I))/2 IDC=J+MDCY(IA,2)+2 130 IF(MDME(IDC,1).EQ.1.OR.MDME(IDC,1).EQ.IPM) VINT(180+I)= & VINT(180+I)+VCKM((IA+1)/2,(IB+1)/2) ELSEIF(IA.GE.11.AND.IA.LE.10+2*MSTP(1)) THEN VINT(180+I)=1. ENDIF 140 CONTINUE C...Choose Lambda value to use in alpha-strong. MSTU(111)=MSTP(2) IF(MSTP(3).GE.1) THEN ALAM=PARP(1) IF(MSTP(51).EQ.1) ALAM=0.2 IF(MSTP(51).EQ.2) ALAM=0.29 IF(MSTP(51).EQ.3) ALAM=0.2 IF(MSTP(51).EQ.4) ALAM=0.4 IF(MSTP(51).EQ.5) ALAM=0.154 IF(MSTP(51).EQ.11) ALAM=0.16 IF(MSTP(51).EQ.12) ALAM=0.26 IF(MSTP(51).EQ.13) ALAM=0.36 PARP(1)=ALAM PARP(61)=ALAM PARU(112)=ALAM PARJ(81)=ALAM ENDIF C...Initialize widths and partial widths for resonances. CALL PYINRE C...Reset variables for cross-section calculation. DO 150 I=0,200 DO 150 J=1,3 NGEN(I,J)=0 150 XSEC(I,J)=0. VINT(108)=0. C...Find parametrized total cross-sections. IF(MINT(43).EQ.4) CALL PYXTOT C...Maxima of differential cross-sections. IF(MSTP(121).LE.0) CALL PYMAXI C...Initialize possibility of overlayed events. IF(MSTP(131).NE.0) CALL PYOVLY(1) C...Initialize multiple interactions with variable impact parameter. IF(MINT(43).EQ.4.AND.(MINT(45).NE.0.OR.MSTP(131).NE.0).AND. &MSTP(82).GE.2) CALL PYMULT(1) WRITE(MSTU(11),1600) C...Formats for initialization information. 1000 FORMAT(///20X,'The Lund Monte Carlo - PYTHIA version ',I1,'.',I1/ &20X,'** Last date of change: ',I2,1X,A3,1X,I4,' **'/) 1100 FORMAT('1',18('*'),1X,'PYINIT: initialization of PYTHIA ', &'routines',1X,17('*')) 1200 FORMAT(1X,'Error: process number ',I3,' not meaningful for ',A6, &'-',A6,' interactions.'/1X,'Execution stopped!') 1300 FORMAT(1X,'Error: requested subprocess',I4,' not implemented.'/ &1X,'Execution stopped!') 1400 FORMAT(1X,'Error: requested subprocess',I4,' not existing.'/ &1X,'Execution stopped!') 1500 FORMAT(1X,'Error: no subprocess switched on.'/ &1X,'Execution stopped.') 1600 FORMAT(/1X,22('*'),1X,'PYINIT: initialization completed',1X, &22('*')) RETURN END C********************************************************************* SUBROUTINE PYTHIA C...Administers the generation of a high-pt event via calls to a number C...of subroutines; also computes cross-sections. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT5/ C...Loop over desired number of overlayed events (normally 1). MINT(7)=0 MINT(8)=0 NOVL=1 IF(MSTP(131).NE.0) CALL PYOVLY(2) IF(MSTP(131).NE.0) NOVL=MINT(81) MINT(83)=0 MINT(84)=MSTP(126) MSTU(70)=0 DO 190 IOVL=1,NOVL IF(MINT(84)+100.GE.MSTU(4)) THEN CALL LUERRM(11, & '(PYTHIA:) no more space in LUJETS for overlayed events') IF(MSTU(21).GE.1) GOTO 200 ENDIF MINT(82)=IOVL C...Generate variables of hard scattering. 100 CONTINUE IF(IOVL.EQ.1) NGEN(0,2)=NGEN(0,2)+1 MINT(31)=0 MINT(51)=0 CALL PYRAND ISUB=MINT(1) IF(IOVL.EQ.1) THEN NGEN(ISUB,2)=NGEN(ISUB,2)+1 C...Store information on hard interaction. DO 110 J=1,200 MSTI(J)=0 110 PARI(J)=0. MSTI(1)=MINT(1) MSTI(2)=MINT(2) MSTI(11)=MINT(11) MSTI(12)=MINT(12) MSTI(15)=MINT(15) MSTI(16)=MINT(16) MSTI(17)=MINT(17) MSTI(18)=MINT(18) PARI(11)=VINT(1) PARI(12)=VINT(2) IF(ISUB.NE.95) THEN DO 120 J=13,22 120 PARI(J)=VINT(30+J) PARI(33)=VINT(41) PARI(34)=VINT(42) PARI(35)=PARI(33)-PARI(34) PARI(36)=VINT(21) PARI(37)=VINT(22) PARI(38)=VINT(26) PARI(41)=VINT(23) ENDIF ENDIF IF(MSTP(111).EQ.-1) GOTO 160 IF(ISUB.LE.90.OR.ISUB.GE.95) THEN C...Hard scattering (including low-pT): C...reconstruct kinematics and colour flow of hard scattering. CALL PYSCAT IF(MINT(51).EQ.1) GOTO 100 C...Showering of initial state partons (optional). IPU1=MINT(84)+1 IPU2=MINT(84)+2 IF(MSTP(61).GE.1.AND.MINT(43).NE.1.AND.ISUB.NE.95) & CALL PYSSPA(IPU1,IPU2) NSAV1=N C...Multiple interactions. IF(MSTP(81).GE.1.AND.MINT(43).EQ.4.AND.ISUB.NE.95) & CALL PYMULT(6) MINT(1)=ISUB NSAV2=N C...Hadron remnants and primordial kT. CALL PYREMN(IPU1,IPU2) IF(MINT(51).EQ.1) GOTO 100 NSAV3=N C...Showering of final state partons (optional). IPU3=MINT(84)+3 IPU4=MINT(84)+4 IF(MSTP(71).GE.1.AND.ISUB.NE.95.AND.ISET(ISUB).GE.2.AND. & K(IPU3,1).GT.0.AND.K(IPU3,1).LE.10.AND.K(IPU4,1).GT.0.AND. & K(IPU4,1).LE.10) THEN QMAX=SQRT(PARP(71)*VINT(52)) IF(ISUB.EQ.5) QMAX=SQRT(PMAS(23,1)**2) IF(ISUB.EQ.8) QMAX=SQRT(PMAS(24,1)**2) CALL LUSHOW(IPU3,IPU4,QMAX) ENDIF C...Sum up transverse and longitudinal momenta. IF(IOVL.EQ.1) THEN PARI(65)=2.*PARI(17) DO 130 I=MSTP(126)+1,N IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 130 PT=SQRT(P(I,1)**2+P(I,2)**2) PARI(69)=PARI(69)+PT IF(I.LE.NSAV1.OR.I.GT.NSAV3) PARI(66)=PARI(66)+PT IF(I.GT.NSAV1.AND.I.LE.NSAV2) PARI(68)=PARI(68)+PT 130 CONTINUE PARI(67)=PARI(68) PARI(71)=VINT(151) PARI(72)=VINT(152) PARI(73)=VINT(151) PARI(74)=VINT(152) ENDIF C...Decay of final state resonances. IF(MSTP(41).GE.1.AND.ISUB.NE.95) CALL PYRESD ELSE C...Diffractive and elastic scattering. CALL PYDIFF IF(IOVL.EQ.1) THEN PARI(65)=2.*PARI(17) PARI(66)=PARI(65) PARI(69)=PARI(65) ENDIF ENDIF C...Recalculate energies from momenta and masses (if desired). IF(MSTP(113).GE.1) THEN DO 140 I=MINT(83)+1,N 140 IF(K(I,1).GT.0.AND.K(I,1).LE.10) P(I,4)=SQRT(P(I,1)**2+ & P(I,2)**2+P(I,3)**2+P(I,5)**2) ENDIF C...Rearrange partons along strings, check invariant mass cuts. MSTU(28)=0 CALL LUPREP(MINT(84)+1) IF(MSTP(112).EQ.1.AND.MSTU(28).EQ.3) GOTO 100 IF(MSTP(125).EQ.0.OR.MSTP(125).EQ.1) THEN DO 150 I=MINT(84)+1,N IF(K(I,2).NE.94) GOTO 150 K(I+1,3)=MOD(K(I+1,4)/MSTU(5),MSTU(5)) K(I+2,3)=MOD(K(I+2,4)/MSTU(5),MSTU(5)) 150 CONTINUE CALL LUEDIT(12) CALL LUEDIT(14) IF(MSTP(125).EQ.0) CALL LUEDIT(15) IF(MSTP(125).EQ.0) MINT(4)=0 ENDIF C...Introduce separators between sections in LULIST event listing. IF(IOVL.EQ.1.AND.MSTP(125).LE.0) THEN MSTU(70)=1 MSTU(71)=N ELSEIF(IOVL.EQ.1) THEN MSTU(70)=3 MSTU(71)=2 MSTU(72)=MINT(4) MSTU(73)=N ENDIF C...Perform hadronization (if desired). IF(MSTP(111).GE.1) CALL LUEXEC IF(MSTU(24).NE.0) GOTO 100 IF(MSTP(125).EQ.0.OR.MSTP(125).EQ.1) CALL LUEDIT(14) C...Calculate Monte Carlo estimates of cross-sections. 160 IF(IOVL.EQ.1) THEN IF(MSTP(111).NE.-1) NGEN(ISUB,3)=NGEN(ISUB,3)+1 NGEN(0,3)=NGEN(0,3)+1 XSEC(0,3)=0. DO 170 I=1,200 IF(I.EQ.96) THEN XSEC(I,3)=0. ELSEIF(MSUB(95).EQ.1.AND.(I.EQ.11.OR.I.EQ.12.OR.I.EQ.13.OR. & I.EQ.28.OR.I.EQ.53.OR.I.EQ.68)) THEN XSEC(I,3)=XSEC(96,2)*NGEN(I,3)/MAX(1.,FLOAT(NGEN(96,1))* & FLOAT(NGEN(96,2))) ELSEIF(NGEN(I,1).EQ.0) THEN XSEC(I,3)=0. ELSEIF(NGEN(I,2).EQ.0) THEN XSEC(I,3)=XSEC(I,2)*NGEN(0,3)/(FLOAT(NGEN(I,1))* & FLOAT(NGEN(0,2))) ELSE XSEC(I,3)=XSEC(I,2)*NGEN(I,3)/(FLOAT(NGEN(I,1))* & FLOAT(NGEN(I,2))) ENDIF 170 XSEC(0,3)=XSEC(0,3)+XSEC(I,3) IF(MSUB(95).EQ.1) THEN NGENS=NGEN(91,3)+NGEN(92,3)+NGEN(93,3)+NGEN(94,3)+NGEN(95,3) XSECS=XSEC(91,3)+XSEC(92,3)+XSEC(93,3)+XSEC(94,3)+XSEC(95,3) XMAXS=XSEC(95,1) IF(MSUB(91).EQ.1) XMAXS=XMAXS+XSEC(91,1) IF(MSUB(92).EQ.1) XMAXS=XMAXS+XSEC(92,1) IF(MSUB(93).EQ.1) XMAXS=XMAXS+XSEC(93,1) IF(MSUB(94).EQ.1) XMAXS=XMAXS+XSEC(94,1) FAC=1. IF(NGENS.LT.NGEN(0,3)) FAC=(XMAXS-XSECS)/(XSEC(0,3)-XSECS) XSEC(11,3)=FAC*XSEC(11,3) XSEC(12,3)=FAC*XSEC(12,3) XSEC(13,3)=FAC*XSEC(13,3) XSEC(28,3)=FAC*XSEC(28,3) XSEC(53,3)=FAC*XSEC(53,3) XSEC(68,3)=FAC*XSEC(68,3) XSEC(0,3)=XSEC(91,3)+XSEC(92,3)+XSEC(93,3)+XSEC(94,3)+ & XSEC(95,1) ENDIF C...Store final information. MINT(5)=MINT(5)+1 MSTI(3)=MINT(3) MSTI(4)=MINT(4) MSTI(5)=MINT(5) MSTI(6)=MINT(6) MSTI(7)=MINT(7) MSTI(8)=MINT(8) MSTI(13)=MINT(13) MSTI(14)=MINT(14) MSTI(21)=MINT(21) MSTI(22)=MINT(22) MSTI(23)=MINT(23) MSTI(24)=MINT(24) MSTI(25)=MINT(25) MSTI(26)=MINT(26) MSTI(31)=MINT(31) PARI(1)=XSEC(0,3) PARI(2)=XSEC(0,3)/MINT(5) PARI(31)=VINT(141) PARI(32)=VINT(142) IF(ISUB.NE.95.AND.MINT(7)*MINT(8).NE.0) THEN PARI(42)=2.*VINT(47)/VINT(1) DO 180 IS=7,8 PARI(36+IS)=P(MINT(IS),3)/VINT(1) PARI(38+IS)=P(MINT(IS),4)/VINT(1) I=MINT(IS) PR=MAX(1E-20,P(I,5)**2+P(I,1)**2+P(I,2)**2) PARI(40+IS)=SIGN(LOG(MIN((SQRT(PR+P(I,3)**2)+ABS(P(I,3)))/ & SQRT(PR),1E20)),P(I,3)) PR=MAX(1E-20,P(I,1)**2+P(I,2)**2) PARI(42+IS)=SIGN(LOG(MIN((SQRT(PR+P(I,3)**2)+ABS(P(I,3)))/ & SQRT(PR),1E20)),P(I,3)) PARI(44+IS)=P(I,3)/SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2) PARI(46+IS)=ULANGL(P(I,3),SQRT(P(I,1)**2+P(I,2)**2)) PARI(48+IS)=ULANGL(P(I,1),P(I,2)) 180 CONTINUE ENDIF PARI(61)=VINT(148) IF(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.3) THEN MSTU(161)=MINT(21) MSTU(162)=0 ELSE MSTU(161)=MINT(21) MSTU(162)=MINT(22) ENDIF ENDIF C...Prepare to go to next overlayed event. MSTI(41)=IOVL IF(IOVL.GE.2.AND.IOVL.LE.10) MSTI(40+IOVL)=ISUB IF(MSTU(70).LT.10) THEN MSTU(70)=MSTU(70)+1 MSTU(70+MSTU(70))=N ENDIF MINT(83)=N MINT(84)=N+MSTP(126) 190 CONTINUE C...Information on overlayed events. IF(MSTP(131).EQ.1.AND.MSTP(133).GE.1) THEN PARI(91)=VINT(132) PARI(92)=VINT(133) PARI(93)=VINT(134) IF(MSTP(133).EQ.2) PARI(93)=PARI(93)*XSEC(0,3)/VINT(131) ENDIF C...Transform to the desired coordinate frame. 200 CALL PYFRAM(MSTP(124)) RETURN END C*********************************************************************** SUBROUTINE PYSTAT(MSTAT) C...Prints out information about cross-sections, decay widths, branching C...ratios, kinematical limits, status codes and parameter values. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) COMMON/PYINT6/PROC(0:200) CHARACTER PROC*28 SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT4/,/PYINT5/,/PYINT6/ CHARACTER CHAU*16,CHPA(-40:40)*12,CHIN(2)*12, &STATE(-1:5)*4,CHKIN(21)*18 DATA STATE/'----','off ','on ','on/+','on/-','on/1','on/2'/, &CHKIN/' m_hard (GeV/c:2) ',' p_T_hard (GeV/c) ', &'m_finite (GeV/c:2)',' y*_subsystem ',' y*_large ', &' y*_small ',' eta*_large ',' eta*_small ', &'cos(theta*)_large ','cos(theta*)_small ',' x_1 ', &' x_2 ',' x_F ',' cos(theta_hard) ', &'m''_hard (GeV/c:2) ',' tau ',' y* ', &'cos(theta_hard:-) ','cos(theta_hard:+) ',' x_T:2 ', &' tau'' '/ C...Cross-sections. IF(MSTAT.LE.1) THEN WRITE(MSTU(11),1000) WRITE(MSTU(11),1100) WRITE(MSTU(11),1200) 0,PROC(0),NGEN(0,3),NGEN(0,1),XSEC(0,3) DO 100 I=1,200 IF(MSUB(I).NE.1) GOTO 100 WRITE(MSTU(11),1200) I,PROC(I),NGEN(I,3),NGEN(I,1),XSEC(I,3) 100 CONTINUE WRITE(MSTU(11),1300) 1.-FLOAT(NGEN(0,3))/ & MAX(1.,FLOAT(NGEN(0,2))) C...Decay widths and branching ratios. ELSEIF(MSTAT.EQ.2) THEN DO 110 KF=-40,40 CALL LUNAME(KF,CHAU) 110 CHPA(KF)=CHAU(1:12) WRITE(MSTU(11),1400) WRITE(MSTU(11),1500) C...Off-shell branchings. DO 130 I=1,17 KC=I IF(I.GE.9) KC=I+2 IF(I.EQ.17) KC=21 WRITE(MSTU(11),1600) CHPA(KC),0.,0.,STATE(MDCY(KC,1)),0. DO 120 J=1,MDCY(KC,3) IDC=J+MDCY(KC,2)-1 120 IF(MDME(IDC,2).EQ.102) WRITE(MSTU(11),1700) CHPA(KFDP(IDC,1)), & CHPA(KFDP(IDC,2)),0.,0.,STATE(MDME(IDC,1)),0. 130 CONTINUE C...On-shell decays. DO 150 I=1,6 KC=I+22 IF(I.EQ.4) KC=32 IF(I.EQ.5) KC=37 IF(I.EQ.6) KC=40 IF(WIDE(KC,0).GT.0.) THEN WRITE(MSTU(11),1600) CHPA(KC),WIDP(KC,0),1., & STATE(MDCY(KC,1)),1. DO 140 J=1,MDCY(KC,3) IDC=J+MDCY(KC,2)-1 140 WRITE(MSTU(11),1700) CHPA(KFDP(IDC,1)),CHPA(KFDP(IDC,2)), & WIDP(KC,J),WIDP(KC,J)/WIDP(KC,0),STATE(MDME(IDC,1)), & WIDE(KC,J)/WIDE(KC,0) ELSE WRITE(MSTU(11),1600) CHPA(KC),WIDP(KC,0),1., & STATE(MDCY(KC,1)),0. ENDIF 150 CONTINUE WRITE(MSTU(11),1800) C...Allowed incoming partons/particles at hard interaction. ELSEIF(MSTAT.EQ.3) THEN WRITE(MSTU(11),1900) CALL LUNAME(MINT(11),CHAU) CHIN(1)=CHAU(1:12) CALL LUNAME(MINT(12),CHAU) CHIN(2)=CHAU(1:12) WRITE(MSTU(11),2000) CHIN(1),CHIN(2) DO 160 KF=-40,40 CALL LUNAME(KF,CHAU) 160 CHPA(KF)=CHAU(1:12) IF(MINT(43).EQ.1) THEN WRITE(MSTU(11),2100) CHPA(MINT(11)),STATE(KFIN(1,MINT(11))), & CHPA(MINT(12)),STATE(KFIN(2,MINT(12))) ELSEIF(MINT(43).EQ.2) THEN WRITE(MSTU(11),2100) CHPA(MINT(11)),STATE(KFIN(1,MINT(11))), & CHPA(-MSTP(54)),STATE(KFIN(2,-MSTP(54))) DO 170 I=-MSTP(54)+1,-1 170 WRITE(MSTU(11),2200) CHPA(I),STATE(KFIN(2,I)) DO 180 I=1,MSTP(54) 180 WRITE(MSTU(11),2200) CHPA(I),STATE(KFIN(2,I)) WRITE(MSTU(11),2200) CHPA(21),STATE(KFIN(2,21)) ELSEIF(MINT(43).EQ.3) THEN WRITE(MSTU(11),2100) CHPA(-MSTP(54)),STATE(KFIN(1,-MSTP(54))), & CHPA(MINT(12)),STATE(KFIN(2,MINT(12))) DO 190 I=-MSTP(54)+1,-1 190 WRITE(MSTU(11),2300) CHPA(I),STATE(KFIN(1,I)) DO 200 I=1,MSTP(54) 200 WRITE(MSTU(11),2300) CHPA(I),STATE(KFIN(1,I)) WRITE(MSTU(11),2300) CHPA(21),STATE(KFIN(1,21)) ELSEIF(MINT(43).EQ.4) THEN DO 210 I=-MSTP(54),-1 210 WRITE(MSTU(11),2100) CHPA(I),STATE(KFIN(1,I)),CHPA(I), & STATE(KFIN(2,I)) DO 220 I=1,MSTP(54) 220 WRITE(MSTU(11),2100) CHPA(I),STATE(KFIN(1,I)),CHPA(I), & STATE(KFIN(2,I)) WRITE(MSTU(11),2100) CHPA(21),STATE(KFIN(1,21)),CHPA(21), & STATE(KFIN(2,21)) ENDIF WRITE(MSTU(11),2400) C...User-defined and derived limits on kinematical variables. ELSEIF(MSTAT.EQ.4) THEN WRITE(MSTU(11),2500) WRITE(MSTU(11),2600) SHRMAX=CKIN(2) IF(SHRMAX.LT.0.) SHRMAX=VINT(1) WRITE(MSTU(11),2700) CKIN(1),CHKIN(1),SHRMAX PTHMIN=MAX(CKIN(3),CKIN(5)) PTHMAX=CKIN(4) IF(PTHMAX.LT.0.) PTHMAX=0.5*SHRMAX WRITE(MSTU(11),2800) CKIN(3),PTHMIN,CHKIN(2),PTHMAX WRITE(MSTU(11),2900) CHKIN(3),CKIN(6) DO 230 I=4,14 230 WRITE(MSTU(11),2700) CKIN(2*I-1),CHKIN(I),CKIN(2*I) SPRMAX=CKIN(32) IF(SPRMAX.LT.0.) SPRMAX=VINT(1) WRITE(MSTU(11),2700) CKIN(31),CHKIN(15),SPRMAX WRITE(MSTU(11),3000) WRITE(MSTU(11),3100) WRITE(MSTU(11),2600) DO 240 I=16,21 240 WRITE(MSTU(11),2700) VINT(I-5),CHKIN(I),VINT(I+15) WRITE(MSTU(11),3000) C...Status codes and parameter values. ELSEIF(MSTAT.EQ.5) THEN WRITE(MSTU(11),3200) WRITE(MSTU(11),3300) DO 250 I=1,100 250 WRITE(MSTU(11),3400) I,MSTP(I),PARP(I),100+I,MSTP(100+I), & PARP(100+I) ENDIF C...Formats for printouts. 1000 FORMAT('1',9('*'),1X,'PYSTAT: Statistics on Number of ', &'Events and Cross-sections',1X,9('*')) 1100 FORMAT(/1X,78('=')/1X,'I',34X,'I',28X,'I',12X,'I'/1X,'I',12X, &'Subprocess',12X,'I',6X,'Number of points',6X,'I',4X,'Sigma',3X, &'I'/1X,'I',34X,'I',28X,'I',12X,'I'/1X,'I',34('-'),'I',28('-'), &'I',4X,'(mb)',4X,'I'/1X,'I',34X,'I',28X,'I',12X,'I'/1X,'I',1X, &'N:o',1X,'Type',25X,'I',4X,'Generated',9X,'Tried',1X,'I',12X, &'I'/1X,'I',34X,'I',28X,'I',12X,'I'/1X,78('=')/1X,'I',34X,'I',28X, &'I',12X,'I') 1200 FORMAT(1X,'I',1X,I3,1X,A28,1X,'I',1X,I12,1X,I13,1X,'I',1X,1P, &E10.3,1X,'I') 1300 FORMAT(1X,'I',34X,'I',28X,'I',12X,'I'/1X,78('=')// &1X,'********* Fraction of events that fail fragmentation ', &'cuts =',1X,F8.5,' *********'/) 1400 FORMAT('1',17('*'),1X,'PYSTAT: Decay Widths and Branching ', &'Ratios',1X,17('*')) 1500 FORMAT(/1X,78('=')/1X,'I',29X,'I',13X,'I',12X,'I',6X,'I',12X,'I'/ &1X,'I',1X,'Branching/Decay Channel',5X,'I',1X,'Width (GeV)',1X, &'I',7X,'B.R.',1X,'I',1X,'Stat',1X,'I',2X,'Eff. B.R.',1X,'I'/1X, &'I',29X,'I',13X,'I',12X,'I',6X,'I',12X,'I'/1X,78('=')) 1600 FORMAT(1X,'I',29X,'I',13X,'I',12X,'I',6X,'I',12X,'I'/1X,'I',1X, &A12,1X,'->',13X,'I',2X,1P,E10.3,0P,1X,'I',1X,1P,E10.3,0P,1X,'I', &1X,A4,1X,'I',1X,1P,E10.3,0P,1X,'I') 1700 FORMAT(1X,'I',1X,A12,1X,'+',1X,A12,1X,'I',2X,1P,E10.3,0P,1X,'I', &1X,1P,E10.3,0P,1X,'I',1X,A4,1X,'I',1X,1P,E10.3,0P,1X,'I') 1800 FORMAT(1X,'I',29X,'I',13X,'I',12X,'I',6X,'I',12X,'I'/1X,78('=')) 1900 FORMAT('1',7('*'),1X,'PYSTAT: Allowed Incoming Partons/', &'Particles at Hard Interaction',1X,7('*')) 2000 FORMAT(/1X,78('=')/1X,'I',38X,'I',37X,'I'/1X,'I',1X, &'Beam particle:',1X,A,10X,'I',1X,'Target particle:',1X,A,7X, &'I'/1X,'I',38X,'I',37X,'I'/1X,'I',1X,'Content',9X,'State',16X, &'I',1X,'Content',9X,'State',15X,'I'/1X,'I',38X,'I',37X,'I'/1X, &78('=')/1X,'I',38X,'I',37X,'I') 2100 FORMAT(1X,'I',1X,A,5X,A,16X,'I',1X,A,5X,A,15X,'I') 2200 FORMAT(1X,'I',38X,'I',1X,A,5X,A,15X,'I') 2300 FORMAT(1X,'I',1X,A,5X,A,16X,'I',37X,'I') 2400 FORMAT(1X,'I',38X,'I',37X,'I'/1X,78('=')) 2500 FORMAT('1',12('*'),1X,'PYSTAT: User-Defined Limits on ', &'Kinematical Variables',1X,12('*')) 2600 FORMAT(/1X,78('=')/1X,'I',76X,'I') 2700 FORMAT(1X,'I',16X,1P,E10.3,0P,1X,'<',1X,A,1X,'<',1X,1P,E10.3,0P, &16X,'I') 2800 FORMAT(1X,'I',3X,1P,E10.3,0P,1X,'(',1P,E10.3,0P,')',1X,'<',1X,A, &1X,'<',1X,1P,E10.3,0P,16X,'I') 2900 FORMAT(1X,'I',29X,A,1X,'=',1X,1P,E10.3,0P,16X,'I') 3000 FORMAT(1X,'I',76X,'I'/1X,78('=')) 3100 FORMAT(////1X,5('*'),1X,'PYSTAT: Derived Limits on Kinematical ', &'Variables Used in Generation',1X,5('*')) 3200 FORMAT('1',12('*'),1X,'PYSTAT: Summary of Status Codes and ', &'Parameter Values',1X,12('*')) 3300 FORMAT(/3X,'I',4X,'MSTP(I)',9X,'PARP(I)',20X,'I',4X,'MSTP(I)',9X, &'PARP(I)'/) 3400 FORMAT(1X,I3,5X,I6,6X,1P,E10.3,0P,18X,I3,5X,I6,6X,1P,E10.3) RETURN END C********************************************************************* SUBROUTINE PYINKI(CHFRAM,CHBEAM,CHTARG,WIN) C...Identifies the two incoming particles and sets up kinematics, C...including rotations and boosts to/from CM frame. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) SAVE /LUJETS/,/LUDAT1/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/ CHARACTER CHFRAM*8,CHBEAM*8,CHTARG*8,CHCOM(3)*8,CHALP(2)*26, &CHIDNT(3)*8,CHTEMP*8,CHCDE(18)*8,CHINIT*76 DIMENSION LEN(3),KCDE(18) DATA CHALP/'abcdefghijklmnopqrstuvwxyz', &'ABCDEFGHIJKLMNOPQRSTUVWXYZ'/ DATA CHCDE/'e- ','e+ ','nue ','nue~ ', &'mu- ','mu+ ','numu ','numu~ ','tau- ', &'tau+ ','nutau ','nutau~ ','pi+ ','pi- ', &'n ','n~ ','p ','p~ '/ DATA KCDE/11,-11,12,-12,13,-13,14,-14,15,-15,16,-16, &211,-211,2112,-2112,2212,-2212/ C...Convert character variables to lowercase and find their length. CHCOM(1)=CHFRAM CHCOM(2)=CHBEAM CHCOM(3)=CHTARG DO 120 I=1,3 LEN(I)=8 DO 100 LL=8,1,-1 IF(LEN(I).EQ.LL.AND.CHCOM(I)(LL:LL).EQ.' ') LEN(I)=LL-1 DO 100 LA=1,26 100 IF(CHCOM(I)(LL:LL).EQ.CHALP(2)(LA:LA)) CHCOM(I)(LL:LL)= &CHALP(1)(LA:LA) CHIDNT(I)=CHCOM(I) DO 110 LL=1,6 IF(CHIDNT(I)(LL:LL+2).EQ.'bar') THEN CHTEMP=CHIDNT(I) CHIDNT(I)=CHTEMP(1:LL-1)//'~'//CHTEMP(LL+3:8)//' ' ENDIF 110 CONTINUE DO 120 LL=1,8 IF(CHIDNT(I)(LL:LL).EQ.'_') THEN CHTEMP=CHIDNT(I) CHIDNT(I)=CHTEMP(1:LL-1)//CHTEMP(LL+1:8)//' ' ENDIF 120 CONTINUE C...Set initial state. Error for unknown codes. Reset variables. N=2 DO 140 I=1,2 K(I,1)=1 K(I,2)=0 DO 130 J=1,18 130 IF(CHIDNT(I+1).EQ.CHCDE(J)) K(I,2)=KCDE(J) P(I,5)=ULMASS(K(I,2)) MINT(40+I)=1 IF(IABS(K(I,2)).GT.100) MINT(40+I)=2 DO 140 J=1,5 140 V(I,J)=0. IF(K(1,2).EQ.0) WRITE(MSTU(11),1000) CHBEAM(1:LEN(2)) IF(K(2,2).EQ.0) WRITE(MSTU(11),1100) CHTARG(1:LEN(3)) IF(K(1,2).EQ.0.OR.K(2,2).EQ.0) STOP DO 150 J=6,10 150 VINT(J)=0. CHINIT=' ' C...Set up kinematics for events defined in CM frame. IF(CHCOM(1)(1:2).EQ.'cm') THEN IF(CHCOM(2)(1:1).NE.'e') THEN LOFFS=(34-(LEN(2)+LEN(3)))/2 CHINIT(LOFFS+1:76)='PYTHIA will be initialized for a '// & CHCOM(2)(1:LEN(2))//'-'//CHCOM(3)(1:LEN(3))//' collider'//' ' ELSE LOFFS=(33-(LEN(2)+LEN(3)))/2 CHINIT(LOFFS+1:76)='PYTHIA will be initialized for an '// & CHCOM(2)(1:LEN(2))//'-'//CHCOM(3)(1:LEN(3))//' collider'//' ' ENDIF WRITE(MSTU(11),1200) CHINIT WRITE(MSTU(11),1300) WIN S=WIN**2 P(1,1)=0. P(1,2)=0. P(2,1)=0. P(2,2)=0. P(1,3)=SQRT(((S-P(1,5)**2-P(2,5)**2)**2-(2.*P(1,5)*P(2,5))**2)/ & (4.*S)) P(2,3)=-P(1,3) P(1,4)=SQRT(P(1,3)**2+P(1,5)**2) P(2,4)=SQRT(P(2,3)**2+P(2,5)**2) C...Set up kinematics for fixed target events. ELSEIF(CHCOM(1)(1:3).EQ.'fix') THEN LOFFS=(29-(LEN(2)+LEN(3)))/2 CHINIT(LOFFS+1:76)='PYTHIA will be initialized for '// & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))// & ' fixed target'//' ' WRITE(MSTU(11),1200) CHINIT WRITE(MSTU(11),1400) WIN P(1,1)=0. P(1,2)=0. P(2,1)=0. P(2,2)=0. P(1,3)=WIN P(1,4)=SQRT(P(1,3)**2+P(1,5)**2) P(2,3)=0. P(2,4)=P(2,5) S=P(1,5)**2+P(2,5)**2+2.*P(2,4)*P(1,4) VINT(10)=P(1,3)/(P(1,4)+P(2,4)) CALL LUROBO(0.,0.,0.,0.,-VINT(10)) WRITE(MSTU(11),1500) SQRT(S) C...Set up kinematics for events in user-defined frame. ELSEIF(CHCOM(1)(1:3).EQ.'use') THEN LOFFS=(13-(LEN(1)+LEN(2)))/2 CHINIT(LOFFS+1:76)='PYTHIA will be initialized for '// & CHCOM(2)(1:LEN(2))//' on '//CHCOM(3)(1:LEN(3))// & 'user-specified configuration'//' ' WRITE(MSTU(11),1200) CHINIT WRITE(MSTU(11),1600) WRITE(MSTU(11),1700) CHCOM(2),P(1,1),P(1,2),P(1,3) WRITE(MSTU(11),1700) CHCOM(3),P(2,1),P(2,2),P(2,3) P(1,4)=SQRT(P(1,1)**2+P(1,2)**2+P(1,3)**2+P(1,5)**2) P(2,4)=SQRT(P(2,1)**2+P(2,2)**2+P(2,3)**2+P(2,5)**2) DO 160 J=1,3 160 VINT(7+J)=(DBLE(P(1,J))+DBLE(P(2,J)))/DBLE(P(1,4)+P(2,4)) CALL LUROBO(0.,0.,-VINT(8),-VINT(9),-VINT(10)) VINT(7)=ULANGL(P(1,1),P(1,2)) CALL LUROBO(0.,-VINT(7),0.,0.,0.) VINT(6)=ULANGL(P(1,3),P(1,1)) CALL LUROBO(-VINT(6),0.,0.,0.,0.) S=P(1,5)**2+P(2,5)**2+2.*(P(1,4)*P(2,4)-P(1,3)*P(2,3)) WRITE(MSTU(11),1500) SQRT(S) C...Unknown frame. Error for too low CM energy. ELSE WRITE(MSTU(11),1800) CHFRAM(1:LEN(1)) STOP ENDIF IF(S.LT.PARP(2)**2) THEN WRITE(MSTU(11),1900) SQRT(S) STOP ENDIF C...Save information on incoming particles. MINT(11)=K(1,2) MINT(12)=K(2,2) MINT(43)=2*MINT(41)+MINT(42)-2 VINT(1)=SQRT(S) VINT(2)=S VINT(3)=P(1,5) VINT(4)=P(2,5) VINT(5)=P(1,3) C...Store constants to be used in generation. IF(MSTP(82).LE.1) VINT(149)=4.*PARP(81)**2/S IF(MSTP(82).GE.2) VINT(149)=4.*PARP(82)**2/S C...Formats for initialization and error information. 1000 FORMAT(1X,'Error: unrecognized beam particle ''',A,'''.'/ &1X,'Execution stopped!') 1100 FORMAT(1X,'Error: unrecognized target particle ''',A,'''.'/ &1X,'Execution stopped!') 1200 FORMAT(/1X,78('=')/1X,'I',76X,'I'/1X,'I',A76,'I') 1300 FORMAT(1X,'I',18X,'at',1X,F10.3,1X,'GeV center-of-mass energy', &19X,'I'/1X,'I',76X,'I'/1X,78('=')) 1400 FORMAT(1X,'I',22X,'at',1X,F10.3,1X,'GeV/c lab-momentum',22X,'I') 1500 FORMAT(1X,'I',76X,'I'/1X,'I',11X,'corresponding to',1X,F10.3,1X, &'GeV center-of-mass energy',12X,'I'/1X,'I',76X,'I'/1X,78('=')) 1600 FORMAT(1X,'I',76X,'I'/1X,'I',24X,'px (GeV/c)',3X,'py (GeV/c)',3X, &'pz (GeV/c)',16X,'I') 1700 FORMAT(1X,'I',15X,A8,3(2X,F10.3,1X),15X,'I') 1800 FORMAT(1X,'Error: unrecognized coordinate frame ''',A,'''.'/ &1X,'Execution stopped!') 1900 FORMAT(1X,'Error: too low CM energy,',F8.3,' GeV for event ', &'generation.'/1X,'Execution stopped!') RETURN END C********************************************************************* SUBROUTINE PYINRE C...Calculates full and effective widths of guage bosons, stores masses C...and widths, rescales coefficients to be used for resonance C...production generation. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT6/PROC(0:200) CHARACTER PROC*28 SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT4/,/PYINT6/ DIMENSION WDTP(0:40),WDTE(0:40,0:5) C...Calculate full and effective widths of gauge bosons. AEM=PARU(101) XW=PARU(102) DO 100 I=21,40 DO 100 J=0,40 WIDP(I,J)=0. 100 WIDE(I,J)=0. C...W+/-: WMAS=PMAS(24,1) WFAC=AEM/(24.*XW)*WMAS CALL PYWIDT(24,WMAS,WDTP,WDTE) WIDS(24,1)=((WDTE(0,1)+WDTE(0,2))*(WDTE(0,1)+WDTE(0,3))+ &(WDTE(0,1)+WDTE(0,2)+WDTE(0,1)+WDTE(0,3))*(WDTE(0,4)+WDTE(0,5))+ &2.*WDTE(0,4)*WDTE(0,5))/WDTP(0)**2 WIDS(24,2)=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))/WDTP(0) WIDS(24,3)=(WDTE(0,1)+WDTE(0,3)+WDTE(0,4))/WDTP(0) DO 110 I=0,40 WIDP(24,I)=WFAC*WDTP(I) 110 WIDE(24,I)=WFAC*WDTE(I,0) C...H+/-: HCMAS=PMAS(37,1) HCFAC=AEM/(8.*XW)*(HCMAS/WMAS)**2*HCMAS CALL PYWIDT(37,HCMAS,WDTP,WDTE) WIDS(37,1)=((WDTE(0,1)+WDTE(0,2))*(WDTE(0,1)+WDTE(0,3))+ &(WDTE(0,1)+WDTE(0,2)+WDTE(0,1)+WDTE(0,3))*(WDTE(0,4)+WDTE(0,5))+ &2.*WDTE(0,4)*WDTE(0,5))/WDTP(0)**2 WIDS(37,2)=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))/WDTP(0) WIDS(37,3)=(WDTE(0,1)+WDTE(0,3)+WDTE(0,4))/WDTP(0) DO 120 I=0,40 WIDP(37,I)=HCFAC*WDTP(I) 120 WIDE(37,I)=HCFAC*WDTE(I,0) C...Z0: ZMAS=PMAS(23,1) ZFAC=AEM/(48.*XW*(1.-XW))*ZMAS CALL PYWIDT(23,ZMAS,WDTP,WDTE) WIDS(23,1)=((WDTE(0,1)+WDTE(0,2))**2+ &2.*(WDTE(0,1)+WDTE(0,2))*(WDTE(0,4)+WDTE(0,5))+ &2.*WDTE(0,4)*WDTE(0,5))/WDTP(0)**2 WIDS(23,2)=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))/WDTP(0) WIDS(23,3)=0. DO 130 I=0,40 WIDP(23,I)=ZFAC*WDTP(I) 130 WIDE(23,I)=ZFAC*WDTE(I,0) C...H0: HMAS=PMAS(25,1) HFAC=AEM/(8.*XW)*(HMAS/WMAS)**2*HMAS MINT(61)=1 CALL PYWIDT(25,HMAS,WDTP,WDTE) WIDS(25,1)=((WDTE(0,1)+WDTE(0,2))**2+ &2.*(WDTE(0,1)+WDTE(0,2))*(WDTE(0,4)+WDTE(0,5))+ &2.*WDTE(0,4)*WDTE(0,5))/WDTP(0)**2 WIDS(25,2)=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))/WDTP(0) WIDS(25,3)=0. DO 140 I=0,40 WIDP(25,I)=HFAC*WDTP(I) 140 WIDE(25,I)=HFAC*WDTE(I,0) C...Z'0: ZPMAS=PMAS(32,1) ZPFAC=AEM/(48.*XW*(1.-XW))*ZPMAS CALL PYWIDT(32,ZPMAS,WDTP,WDTE) WIDS(32,1)=((WDTE(0,1)+WDTE(0,2)+WDTE(0,3))**2+ &2.*(WDTE(0,1)+WDTE(0,2))*(WDTE(0,4)+WDTE(0,5))+ &2.*WDTE(0,4)*WDTE(0,5))/WDTP(0)**2 WIDS(32,2)=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))/WDTP(0) WIDS(32,3)=0. DO 150 I=0,40 WIDP(32,I)=ZPFAC*WDTP(I) 150 WIDE(32,I)=ZPFAC*WDTE(I,0) C...R: RMAS=PMAS(40,1) RFAC=0.08*RMAS/((MSTP(1)-1)*(1.+6.*(1.+ULALPS(RMAS**2)/PARU(1)))) CALL PYWIDT(40,RMAS,WDTP,WDTE) WIDS(40,1)=((WDTE(0,1)+WDTE(0,2))*(WDTE(0,1)+WDTE(0,3))+ &(WDTE(0,1)+WDTE(0,2)+WDTE(0,1)+WDTE(0,3))*(WDTE(0,4)+WDTE(0,5))+ &2.*WDTE(0,4)*WDTE(0,5))/WDTP(0)**2 WIDS(40,2)=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))/WDTP(0) WIDS(40,3)=(WDTE(0,1)+WDTE(0,3)+WDTE(0,4))/WDTP(0) DO 160 I=0,40 WIDP(40,I)=RFAC*WDTP(I) 160 WIDE(40,I)=RFAC*WDTE(I,0) C...Q: KFLQM=1 DO 170 I=1,MIN(8,MDCY(21,3)) IDC=I+MDCY(21,2)-1 IF(MDME(IDC,1).LE.0) GOTO 170 KFLQM=I 170 CONTINUE MINT(46)=KFLQM KFPR(81,1)=KFLQM KFPR(81,2)=KFLQM KFPR(82,1)=KFLQM KFPR(82,2)=KFLQM C...Set resonance widths and branching ratios in JETSET. DO 180 I=1,6 IF(I.LE.3) KC=I+22 IF(I.EQ.4) KC=32 IF(I.EQ.5) KC=37 IF(I.EQ.6) KC=40 PMAS(KC,2)=WIDP(KC,0) PMAS(KC,3)=MIN(0.9*PMAS(KC,1),10.*PMAS(KC,2)) DO 180 J=1,MDCY(KC,3) IDC=J+MDCY(KC,2)-1 BRAT(IDC)=WIDE(KC,J)/WIDE(KC,0) 180 CONTINUE C...Special cases in treatment of gamma*/Z0: redefine process name. IF(MSTP(43).EQ.1) THEN PROC(1)='f + fb -> gamma*' ELSEIF(MSTP(43).EQ.2) THEN PROC(1)='f + fb -> Z0' ELSEIF(MSTP(43).EQ.3) THEN PROC(1)='f + fb -> gamma*/Z0' ENDIF C...Special cases in treatment of gamma*/Z0/Z'0: redefine process name. IF(MSTP(44).EQ.1) THEN PROC(141)='f + fb -> gamma*' ELSEIF(MSTP(44).EQ.2) THEN PROC(141)='f + fb -> Z0' ELSEIF(MSTP(44).EQ.3) THEN PROC(141)='f + fb -> Z''0' ELSEIF(MSTP(44).EQ.4) THEN PROC(141)='f + fb -> gamma*/Z0' ELSEIF(MSTP(44).EQ.5) THEN PROC(141)='f + fb -> gamma*/Z''0' ELSEIF(MSTP(44).EQ.6) THEN PROC(141)='f + fb -> Z0/Z''0' ELSEIF(MSTP(44).EQ.7) THEN PROC(141)='f + fb -> gamma*/Z0/Z''0' ENDIF RETURN END C********************************************************************* SUBROUTINE PYXTOT C...Parametrizes total, double diffractive, single diffractive and C...elastic cross-sections for different energies and beams. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUDAT1/ SAVE /PYPARS/,/PYINT1/,/PYINT5/ DIMENSION BCS(5,8),BCB(2,5),BCC(3) C...The following data lines are coefficients needed in the C...Block, Cahn parametrization of total cross-section and nuclear C...slope parameter; see below. DATA ((BCS(I,J),J=1,8),I=1,5)/ 1 41.74, 0.66, 0.0000, 337., 0.0, 0.0, -39.3, 0.48, 2 41.66, 0.60, 0.0000, 306., 0.0, 0.0, -34.6, 0.51, 3 41.36, 0.63, 0.0000, 299., 7.3, 0.5, -40.4, 0.47, 4 41.68, 0.63, 0.0083, 330., 0.0, 0.0, -39.0, 0.48, 5 41.13, 0.59, 0.0074, 278., 10.5, 0.5, -41.2, 0.46/ DATA ((BCB(I,J),J=1,5),I=1,2)/ 1 10.79, -0.049, 0.040, 21.5, 1.23, 2 9.92, -0.027, 0.013, 18.9, 1.07/ DATA BCC/2.0164346,-0.5590311,0.0376279/ C...Total cross-section and nuclear slope parameter for pp and p-pbar NFIT=MIN(5,MAX(1,MSTP(31))) SIGP=BCS(NFIT,1)+BCS(NFIT,2)*(-0.25*PARU(1)**2* &(1.-0.25*BCS(NFIT,3)*PARU(1)**2)+(1.+0.5*BCS(NFIT,3)*PARU(1)**2)* &(LOG(VINT(2)/BCS(NFIT,4)))**2+BCS(NFIT,3)* &(LOG(VINT(2)/BCS(NFIT,4)))**4)/ &((1.-0.25*BCS(NFIT,3)*PARU(1)**2)**2+2.*BCS(NFIT,3)* &(1.+0.25*BCS(NFIT,3)*PARU(1)**2)*(LOG(VINT(2)/BCS(NFIT,4)))**2+ &BCS(NFIT,3)**2*(LOG(VINT(2)/BCS(NFIT,4)))**4)+BCS(NFIT,5)* &VINT(2)**(BCS(NFIT,6)-1.)*SIN(0.5*PARU(1)*BCS(NFIT,6)) SIGM=-BCS(NFIT,7)*VINT(2)**(BCS(NFIT,8)-1.)* &COS(0.5*PARU(1)*BCS(NFIT,8)) REFP=BCS(NFIT,2)*PARU(1)*LOG(VINT(2)/BCS(NFIT,4))/ &((1.-0.25*BCS(NFIT,3)*PARU(1)**2)**2+2.*BCS(NFIT,3)* &(1.+0.25*BCS(NFIT,3)*PARU(1)**2)+(LOG(VINT(2)/BCS(NFIT,4)))**2+ &BCS(NFIT,3)**2*(LOG(VINT(2)/BCS(NFIT,4)))**4)-BCS(NFIT,5)* &VINT(2)**(BCS(NFIT,6)-1.)*COS(0.5*PARU(1)*BCS(NFIT,6)) REFM=-BCS(NFIT,7)*VINT(2)**(BCS(NFIT,8)-1.)* &SIN(0.5*PARU(1)*BCS(NFIT,8)) SIGMA=SIGP-ISIGN(1,MINT(11)*MINT(12))*SIGM RHO=(REFP-ISIGN(1,MINT(11)*MINT(12))*REFM)/SIGMA C...Nuclear slope parameter B, curvature C: NFIT=1 IF(MSTP(31).GE.4) NFIT=2 BP=BCB(NFIT,1)+BCB(NFIT,2)*LOG(VINT(2))+ &BCB(NFIT,3)*(LOG(VINT(2)))**2 BM=BCB(NFIT,4)+BCB(NFIT,5)*LOG(VINT(2)) B=BP-ISIGN(1,MINT(11)*MINT(12))*SIGM/SIGP*(BM-BP) VINT(121)=B C=-0.5*BCC(2)/BCC(3)*(1.-SQRT(MAX(0.,1.+4.*BCC(3)/BCC(2)**2* &(1.E-03*VINT(1)-BCC(1))))) VINT(122)=C C...Elastic scattering cross-section (fixed by sigma-tot, rho and B). SIGEL=SIGMA**2*(1.+RHO**2)/(16.*PARU(1)*PARU(5)*B) C...Single diffractive scattering cross-section from Goulianos: SIGSD=2.*0.68*(1.+36./VINT(2))*LOG(0.6+0.1*VINT(2)) C...Double diffractive scattering cross-section (essentially fixed by C...sigma-sd and sigma-el). SIGDD=SIGSD**2/(3.*SIGEL) C...Total non-elastic, non-diffractive cross-section. SIGND=SIGMA-SIGDD-SIGSD-SIGEL C...Rescale for pions. IF(IABS(MINT(11)).EQ.211.AND.IABS(MINT(12)).EQ.211) THEN SIGMA=4./9.*SIGMA SIGDD=4./9.*SIGDD SIGSD=4./9.*SIGSD SIGEL=4./9.*SIGEL SIGND=4./9.*SIGND ELSEIF(IABS(MINT(11)).EQ.211.OR.IABS(MINT(12)).EQ.211) THEN SIGMA=2./3.*SIGMA SIGDD=2./3.*SIGDD SIGSD=2./3.*SIGSD SIGEL=2./3.*SIGEL SIGND=2./3.*SIGND ENDIF C...Save cross-sections in common block PYPARA. VINT(101)=SIGMA VINT(102)=SIGEL VINT(103)=SIGSD VINT(104)=SIGDD VINT(106)=SIGND XSEC(95,1)=SIGND RETURN END C********************************************************************* SUBROUTINE PYMAXI C...Finds optimal set of coefficients for kinematical variable selection C...and the maximum of the part of the differential cross-section used C...in the event weighting. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) COMMON/PYINT6/PROC(0:200) CHARACTER PROC*28 SAVE /LUDAT1/,/LUDAT2/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT4/, &/PYINT5/,/PYINT6/ CHARACTER CVAR(4)*4 DIMENSION NPTS(4),MVARPT(200,4),VINTPT(200,30),SIGSPT(200), &NAREL(6),WTREL(6),WTMAT(6,6),COEFU(6),IACCMX(4),SIGSMX(4), &SIGSSM(3) DATA CVAR/'tau ','tau''','y* ','cth '/ C...Select subprocess to study: skip cases not applicable. VINT(143)=1. VINT(144)=1. XSEC(0,1)=0. DO 350 ISUB=1,200 IF(ISUB.GE.91.AND.ISUB.LE.95) THEN XSEC(ISUB,1)=VINT(ISUB+11) IF(MSUB(ISUB).NE.1) GOTO 350 GOTO 340 ELSEIF(ISUB.EQ.96) THEN IF(MINT(43).NE.4) GOTO 350 IF(MSUB(95).NE.1.AND.MSTP(81).LE.0.AND.MSTP(131).LE.0) GOTO 350 ELSEIF(ISUB.EQ.11.OR.ISUB.EQ.12.OR.ISUB.EQ.13.OR.ISUB.EQ.28.OR. &ISUB.EQ.53.OR.ISUB.EQ.68) THEN IF(MSUB(ISUB).NE.1.OR.MSUB(95).EQ.1) GOTO 350 ELSE IF(MSUB(ISUB).NE.1) GOTO 350 ENDIF MINT(1)=ISUB ISTSB=ISET(ISUB) IF(ISUB.EQ.96) ISTSB=2 IF(MSTP(122).GE.2) WRITE(MSTU(11),1000) ISUB C...Find resonances (explicit or implicit in cross-section). MINT(72)=0 KFR1=0 IF(ISTSB.EQ.1.OR.ISTSB.EQ.3) THEN KFR1=KFPR(ISUB,1) ELSEIF(ISUB.GE.71.AND.ISUB.LE.77) THEN KFR1=25 ENDIF IF(KFR1.NE.0) THEN TAUR1=PMAS(KFR1,1)**2/VINT(2) GAMR1=PMAS(KFR1,1)*PMAS(KFR1,2)/VINT(2) MINT(72)=1 MINT(73)=KFR1 VINT(73)=TAUR1 VINT(74)=GAMR1 ENDIF IF(ISUB.EQ.141) THEN KFR2=23 TAUR2=PMAS(KFR2,1)**2/VINT(2) GAMR2=PMAS(KFR2,1)*PMAS(KFR2,2)/VINT(2) MINT(72)=2 MINT(74)=KFR2 VINT(75)=TAUR2 VINT(76)=GAMR2 ENDIF C...Find product masses and minimum pT of process. SQM3=0. SQM4=0. MINT(71)=0 VINT(71)=CKIN(3) IF(ISTSB.EQ.2.OR.ISTSB.EQ.4) THEN IF(KFPR(ISUB,1).NE.0) SQM3=PMAS(KFPR(ISUB,1),1)**2 IF(KFPR(ISUB,2).NE.0) SQM4=PMAS(KFPR(ISUB,2),1)**2 IF(MIN(SQM3,SQM4).LT.CKIN(6)**2) MINT(71)=1 IF(MINT(71).EQ.1) VINT(71)=MAX(CKIN(3),CKIN(5)) IF(ISUB.EQ.96.AND.MSTP(82).LE.1) VINT(71)=PARP(81) IF(ISUB.EQ.96.AND.MSTP(82).GE.2) VINT(71)=0.08*PARP(82) ENDIF VINT(63)=SQM3 VINT(64)=SQM4 C...Number of points for each variable: tau, tau', y*, cos(theta-hat). NPTS(1)=2+2*MINT(72) IF(MINT(43).EQ.1.AND.(ISTSB.EQ.1.OR.ISTSB.EQ.2)) NPTS(1)=1 NPTS(2)=1 IF(MINT(43).GE.2.AND.(ISTSB.EQ.3.OR.ISTSB.EQ.4)) NPTS(2)=2 NPTS(3)=1 IF(MINT(43).EQ.4) NPTS(3)=3 NPTS(4)=1 IF(ISTSB.EQ.2.OR.ISTSB.EQ.4) NPTS(4)=5 NTRY=NPTS(1)*NPTS(2)*NPTS(3)*NPTS(4) C...Reset coefficients of cross-section weighting. DO 100 J=1,20 100 COEF(ISUB,J)=0. COEF(ISUB,1)=1. COEF(ISUB,7)=0.5 COEF(ISUB,8)=0.5 COEF(ISUB,10)=1. COEF(ISUB,15)=1. MCTH=0 MTAUP=0 VINT(23)=0. VINT(26)=0. SIGSAM=0. C...Find limits and select tau, y*, cos(theta-hat) and tau' values, C...in grid of phase space points. CALL PYKLIM(1) NACC=0 DO 120 ITRY=1,NTRY IF(MOD(ITRY-1,NPTS(2)*NPTS(3)*NPTS(4)).EQ.0) THEN MTAU=1+(ITRY-1)/(NPTS(2)*NPTS(3)*NPTS(4)) CALL PYKMAP(1,MTAU,0.5) IF(ISTSB.EQ.3.OR.ISTSB.EQ.4) CALL PYKLIM(4) ENDIF IF((ISTSB.EQ.3.OR.ISTSB.EQ.4).AND.MOD(ITRY-1,NPTS(3)*NPTS(4)). &EQ.0) THEN MTAUP=1+MOD((ITRY-1)/(NPTS(3)*NPTS(4)),NPTS(2)) CALL PYKMAP(4,MTAUP,0.5) ENDIF IF(MOD(ITRY-1,NPTS(3)*NPTS(4)).EQ.0) CALL PYKLIM(2) IF(MOD(ITRY-1,NPTS(4)).EQ.0) THEN MYST=1+MOD((ITRY-1)/NPTS(4),NPTS(3)) CALL PYKMAP(2,MYST,0.5) CALL PYKLIM(3) ENDIF IF(ISTSB.EQ.2.OR.ISTSB.EQ.4) THEN MCTH=1+MOD(ITRY-1,NPTS(4)) CALL PYKMAP(3,MCTH,0.5) ENDIF IF(ISUB.EQ.96) VINT(25)=VINT(21)*(1.-VINT(23)**2) C...Calculate and store cross-section. MINT(51)=0 CALL PYKLIM(0) IF(MINT(51).EQ.1) GOTO 120 NACC=NACC+1 MVARPT(NACC,1)=MTAU MVARPT(NACC,2)=MTAUP MVARPT(NACC,3)=MYST MVARPT(NACC,4)=MCTH DO 110 J=1,30 110 VINTPT(NACC,J)=VINT(10+J) CALL PYSIGH(NCHN,SIGS) SIGSPT(NACC)=SIGS IF(SIGS.GT.SIGSAM) SIGSAM=SIGS IF(MSTP(122).GE.2) WRITE(MSTU(11),1100) MTAU,MYST,MCTH,MTAUP, &VINT(21),VINT(22),VINT(23),VINT(26),SIGS 120 CONTINUE IF(SIGSAM.EQ.0.) THEN WRITE(MSTU(11),1200) ISUB STOP ENDIF C...Calculate integrals in tau and y* over maximal phase space limits. TAUMIN=VINT(11) TAUMAX=VINT(31) ATAU1=LOG(TAUMAX/TAUMIN) ATAU2=(TAUMAX-TAUMIN)/(TAUMAX*TAUMIN) IF(NPTS(1).GE.3) THEN ATAU3=LOG(TAUMAX/TAUMIN*(TAUMIN+TAUR1)/(TAUMAX+TAUR1))/TAUR1 ATAU4=(ATAN((TAUMAX-TAUR1)/GAMR1)-ATAN((TAUMIN-TAUR1)/GAMR1))/ & GAMR1 ENDIF IF(NPTS(1).GE.5) THEN ATAU5=LOG(TAUMAX/TAUMIN*(TAUMIN+TAUR2)/(TAUMAX+TAUR2))/TAUR2 ATAU6=(ATAN((TAUMAX-TAUR2)/GAMR2)-ATAN((TAUMIN-TAUR2)/GAMR2))/ & GAMR2 ENDIF YSTMIN=0.5*LOG(TAUMIN) YSTMAX=-YSTMIN AYST0=YSTMAX-YSTMIN AYST1=0.5*(YSTMAX-YSTMIN)**2 AYST3=2.*(ATAN(EXP(YSTMAX))-ATAN(EXP(YSTMIN))) C...Reset. Sum up cross-sections in points calculated. DO 230 IVAR=1,4 IF(NPTS(IVAR).EQ.1) GOTO 230 IF(ISUB.EQ.96.AND.IVAR.EQ.4) GOTO 230 NBIN=NPTS(IVAR) DO 130 J1=1,NBIN NAREL(J1)=0 WTREL(J1)=0. COEFU(J1)=0. DO 130 J2=1,NBIN 130 WTMAT(J1,J2)=0. DO 140 IACC=1,NACC IBIN=MVARPT(IACC,IVAR) NAREL(IBIN)=NAREL(IBIN)+1 WTREL(IBIN)=WTREL(IBIN)+SIGSPT(IACC) C...Sum up tau cross-section pieces in points used. IF(IVAR.EQ.1) THEN TAU=VINTPT(IACC,11) WTMAT(IBIN,1)=WTMAT(IBIN,1)+1. WTMAT(IBIN,2)=WTMAT(IBIN,2)+(ATAU1/ATAU2)/TAU IF(NBIN.GE.3) THEN WTMAT(IBIN,3)=WTMAT(IBIN,3)+(ATAU1/ATAU3)/(TAU+TAUR1) WTMAT(IBIN,4)=WTMAT(IBIN,4)+(ATAU1/ATAU4)*TAU/ & ((TAU-TAUR1)**2+GAMR1**2) ENDIF IF(NBIN.GE.5) THEN WTMAT(IBIN,5)=WTMAT(IBIN,5)+(ATAU1/ATAU5)/(TAU+TAUR2) WTMAT(IBIN,6)=WTMAT(IBIN,6)+(ATAU1/ATAU6)*TAU/ & ((TAU-TAUR2)**2+GAMR2**2) ENDIF C...Sum up tau' cross-section pieces in points used. ELSEIF(IVAR.EQ.2) THEN TAU=VINTPT(IACC,11) TAUP=VINTPT(IACC,16) TAUPMN=VINTPT(IACC,6) TAUPMX=VINTPT(IACC,26) ATAUP1=LOG(TAUPMX/TAUPMN) ATAUP2=((1.-TAU/TAUPMX)**4-(1.-TAU/TAUPMN)**4)/(4.*TAU) WTMAT(IBIN,1)=WTMAT(IBIN,1)+1. WTMAT(IBIN,2)=WTMAT(IBIN,2)+(ATAUP1/ATAUP2)*(1.-TAU/TAUP)**3/ & TAUP C...Sum up y* and cos(theta-hat) cross-section pieces in points used. ELSEIF(IVAR.EQ.3) THEN YST=VINTPT(IACC,12) WTMAT(IBIN,1)=WTMAT(IBIN,1)+(AYST0/AYST1)*(YST-YSTMIN) WTMAT(IBIN,2)=WTMAT(IBIN,2)+(AYST0/AYST1)*(YSTMAX-YST) WTMAT(IBIN,3)=WTMAT(IBIN,3)+(AYST0/AYST3)/COSH(YST) ELSE RM34=2.*SQM3*SQM4/(VINTPT(IACC,11)*VINT(2))**2 RSQM=1.+RM34 CTHMAX=SQRT(1.-4.*VINT(71)**2/(TAUMAX*VINT(2))) CTHMIN=-CTHMAX IF(CTHMAX.GT.0.9999) RM34=MAX(RM34,2.*VINT(71)**2/ & (TAUMAX*VINT(2))) ACTH1=CTHMAX-CTHMIN ACTH2=LOG(MAX(RM34,RSQM-CTHMIN)/MAX(RM34,RSQM-CTHMAX)) ACTH3=LOG(MAX(RM34,RSQM+CTHMAX)/MAX(RM34,RSQM+CTHMIN)) ACTH4=1./MAX(RM34,RSQM-CTHMAX)-1./MAX(RM34,RSQM-CTHMIN) ACTH5=1./MAX(RM34,RSQM+CTHMIN)-1./MAX(RM34,RSQM+CTHMAX) CTH=VINTPT(IACC,13) WTMAT(IBIN,1)=WTMAT(IBIN,1)+1. WTMAT(IBIN,2)=WTMAT(IBIN,2)+(ACTH1/ACTH2)/MAX(RM34,RSQM-CTH) WTMAT(IBIN,3)=WTMAT(IBIN,3)+(ACTH1/ACTH3)/MAX(RM34,RSQM+CTH) WTMAT(IBIN,4)=WTMAT(IBIN,4)+(ACTH1/ACTH4)/MAX(RM34,RSQM-CTH)**2 WTMAT(IBIN,5)=WTMAT(IBIN,5)+(ACTH1/ACTH5)/MAX(RM34,RSQM+CTH)**2 ENDIF 140 CONTINUE C...Check that equation system solvable; else trivial way out. IF(MSTP(122).GE.2) WRITE(MSTU(11),1300) CVAR(IVAR) MSOLV=1 DO 150 IBIN=1,NBIN IF(MSTP(122).GE.2) WRITE(MSTU(11),1400) (WTMAT(IBIN,IRED), &IRED=1,NBIN),WTREL(IBIN) 150 IF(NAREL(IBIN).EQ.0) MSOLV=0 IF(MSOLV.EQ.0) THEN DO 160 IBIN=1,NBIN 160 COEFU(IBIN)=1. C...Solve to find relative importance of cross-section pieces. ELSE DO 170 IRED=1,NBIN-1 DO 170 IBIN=IRED+1,NBIN RQT=WTMAT(IBIN,IRED)/WTMAT(IRED,IRED) WTREL(IBIN)=WTREL(IBIN)-RQT*WTREL(IRED) DO 170 ICOE=IRED,NBIN 170 WTMAT(IBIN,ICOE)=WTMAT(IBIN,ICOE)-RQT*WTMAT(IRED,ICOE) DO 190 IRED=NBIN,1,-1 DO 180 ICOE=IRED+1,NBIN 180 WTREL(IRED)=WTREL(IRED)-WTMAT(IRED,ICOE)*COEFU(ICOE) 190 COEFU(IRED)=WTREL(IRED)/WTMAT(IRED,IRED) ENDIF C...Normalize coefficients, with piece shared democratically. COEFSU=0. DO 200 IBIN=1,NBIN COEFU(IBIN)=MAX(0.,COEFU(IBIN)) 200 COEFSU=COEFSU+COEFU(IBIN) IF(IVAR.EQ.1) IOFF=0 IF(IVAR.EQ.2) IOFF=14 IF(IVAR.EQ.3) IOFF=6 IF(IVAR.EQ.4) IOFF=9 IF(COEFSU.GT.0.) THEN DO 210 IBIN=1,NBIN 210 COEF(ISUB,IOFF+IBIN)=PARP(121)/NBIN+(1.-PARP(121))*COEFU(IBIN)/ & COEFSU ELSE DO 220 IBIN=1,NBIN 220 COEF(ISUB,IOFF+IBIN)=1./NBIN ENDIF IF(MSTP(122).GE.2) WRITE(MSTU(11),1500) CVAR(IVAR), &(COEF(ISUB,IOFF+IBIN),IBIN=1,NBIN) 230 CONTINUE C...Find two most promising maxima among points previously determined. DO 240 J=1,4 IACCMX(J)=0 240 SIGSMX(J)=0. NMAX=0 DO 290 IACC=1,NACC DO 250 J=1,30 250 VINT(10+J)=VINTPT(IACC,J) CALL PYSIGH(NCHN,SIGS) IEQ=0 DO 260 IMV=1,NMAX 260 IF(ABS(SIGS-SIGSMX(IMV)).LT.1E-4*(SIGS+SIGSMX(IMV))) IEQ=IMV IF(IEQ.EQ.0) THEN DO 270 IMV=NMAX,1,-1 IIN=IMV+1 IF(SIGS.LE.SIGSMX(IMV)) GOTO 280 IACCMX(IMV+1)=IACCMX(IMV) 270 SIGSMX(IMV+1)=SIGSMX(IMV) IIN=1 280 IACCMX(IIN)=IACC SIGSMX(IIN)=SIGS IF(NMAX.LE.1) NMAX=NMAX+1 ENDIF 290 CONTINUE C...Read out starting position for search. IF(MSTP(122).GE.2) WRITE(MSTU(11),1600) SIGSAM=SIGSMX(1) DO 330 IMAX=1,NMAX IACC=IACCMX(IMAX) MTAU=MVARPT(IACC,1) MTAUP=MVARPT(IACC,2) MYST=MVARPT(IACC,3) MCTH=MVARPT(IACC,4) VTAU=0.5 VYST=0.5 VCTH=0.5 VTAUP=0.5 C...Starting point and step size in parameter space. DO 320 IRPT=1,2 DO 310 IVAR=1,4 IF(NPTS(IVAR).EQ.1) GOTO 310 IF(IVAR.EQ.1) VVAR=VTAU IF(IVAR.EQ.2) VVAR=VTAUP IF(IVAR.EQ.3) VVAR=VYST IF(IVAR.EQ.4) VVAR=VCTH IF(IVAR.EQ.1) MVAR=MTAU IF(IVAR.EQ.2) MVAR=MTAUP IF(IVAR.EQ.3) MVAR=MYST IF(IVAR.EQ.4) MVAR=MCTH IF(IRPT.EQ.1) VDEL=0.1 IF(IRPT.EQ.2) VDEL=MAX(0.01,MIN(0.05,VVAR-0.02,0.98-VVAR)) IF(IRPT.EQ.1) VMAR=0.02 IF(IRPT.EQ.2) VMAR=0.002 IMOV0=1 IF(IRPT.EQ.1.AND.IVAR.EQ.1) IMOV0=0 DO 300 IMOV=IMOV0,8 C...Define new point in parameter space. IF(IMOV.EQ.0) THEN INEW=2 VNEW=VVAR ELSEIF(IMOV.EQ.1) THEN INEW=3 VNEW=VVAR+VDEL ELSEIF(IMOV.EQ.2) THEN INEW=1 VNEW=VVAR-VDEL ELSEIF(SIGSSM(3).GE.MAX(SIGSSM(1),SIGSSM(2)).AND. &VVAR+2.*VDEL.LT.1.-VMAR) THEN VVAR=VVAR+VDEL SIGSSM(1)=SIGSSM(2) SIGSSM(2)=SIGSSM(3) INEW=3 VNEW=VVAR+VDEL ELSEIF(SIGSSM(1).GE.MAX(SIGSSM(2),SIGSSM(3)).AND. &VVAR-2.*VDEL.GT.VMAR) THEN VVAR=VVAR-VDEL SIGSSM(3)=SIGSSM(2) SIGSSM(2)=SIGSSM(1) INEW=1 VNEW=VVAR-VDEL ELSEIF(SIGSSM(3).GE.SIGSSM(1)) THEN VDEL=0.5*VDEL VVAR=VVAR+VDEL SIGSSM(1)=SIGSSM(2) INEW=2 VNEW=VVAR ELSE VDEL=0.5*VDEL VVAR=VVAR-VDEL SIGSSM(3)=SIGSSM(2) INEW=2 VNEW=VVAR ENDIF C...Convert to relevant variables and find derived new limits. IF(IVAR.EQ.1) THEN VTAU=VNEW CALL PYKMAP(1,MTAU,VTAU) IF(ISTSB.EQ.3.OR.ISTSB.EQ.4) CALL PYKLIM(4) ENDIF IF(IVAR.LE.2.AND.(ISTSB.EQ.3.OR.ISTSB.EQ.4)) THEN IF(IVAR.EQ.2) VTAUP=VNEW CALL PYKMAP(4,MTAUP,VTAUP) ENDIF IF(IVAR.LE.2) CALL PYKLIM(2) IF(IVAR.LE.3) THEN IF(IVAR.EQ.3) VYST=VNEW CALL PYKMAP(2,MYST,VYST) CALL PYKLIM(3) ENDIF IF(ISTSB.EQ.2.OR.ISTSB.EQ.4) THEN IF(IVAR.EQ.4) VCTH=VNEW CALL PYKMAP(3,MCTH,VCTH) ENDIF IF(ISUB.EQ.96) VINT(25)=VINT(21)*(1.-VINT(23)**2) C...Evaluate cross-section. Save new maximum. Final maximum. CALL PYSIGH(NCHN,SIGS) SIGSSM(INEW)=SIGS IF(SIGS.GT.SIGSAM) SIGSAM=SIGS IF(MSTP(122).GE.2) WRITE(MSTU(11),1700) IMAX,IVAR,MVAR,IMOV, &VNEW,VINT(21),VINT(22),VINT(23),VINT(26),SIGS 300 CONTINUE 310 CONTINUE 320 CONTINUE IF(IMAX.EQ.1) SIGS11=SIGSAM 330 CONTINUE XSEC(ISUB,1)=1.05*SIGSAM 340 IF(ISUB.NE.96) XSEC(0,1)=XSEC(0,1)+XSEC(ISUB,1) 350 CONTINUE C...Print summary table. IF(MSTP(122).GE.1) THEN WRITE(MSTU(11),1800) WRITE(MSTU(11),1900) DO 360 ISUB=1,200 IF(MSUB(ISUB).NE.1.AND.ISUB.NE.96) GOTO 360 IF(ISUB.EQ.96.AND.MINT(43).NE.4) GOTO 360 IF(ISUB.EQ.96.AND.MSUB(95).NE.1.AND.MSTP(81).LE.0) GOTO 360 IF(MSUB(95).EQ.1.AND.(ISUB.EQ.11.OR.ISUB.EQ.12.OR.ISUB.EQ.13.OR. & ISUB.EQ.28.OR.ISUB.EQ.53.OR.ISUB.EQ.68)) GOTO 360 WRITE(MSTU(11),2000) ISUB,PROC(ISUB),XSEC(ISUB,1) 360 CONTINUE WRITE(MSTU(11),2100) ENDIF C...Format statements for maximization results. 1000 FORMAT(/1X,'Coefficient optimization and maximum search for ', &'subprocess no',I4/1X,'Coefficient modes tau',10X,'y*',9X, &'cth',9X,'tau''',7X,'sigma') 1100 FORMAT(1X,4I4,F12.8,F12.6,F12.7,F12.8,1P,E12.4) 1200 FORMAT(1X,'Error: requested subprocess ',I3,' has vanishing ', &'cross-section.'/1X,'Execution stopped!') 1300 FORMAT(1X,'Coefficients of equation system to be solved for ',A4) 1400 FORMAT(1X,1P,7E11.3) 1500 FORMAT(1X,'Result for ',A4,':',6F9.4) 1600 FORMAT(1X,'Maximum search for given coefficients'/2X,'MAX VAR ', &'MOD MOV VNEW',7X,'tau',7X,'y*',8X,'cth',7X,'tau''',7X,'sigma') 1700 FORMAT(1X,4I4,F8.4,F11.7,F9.3,F11.6,F11.7,1P,E12.4) 1800 FORMAT(/1X,8('*'),1X,'PYMAXI: summary of differential ', &'cross-section maximum search',1X,8('*')) 1900 FORMAT(/11X,58('=')/11X,'I',38X,'I',17X,'I'/11X,'I ISUB ', &'Subprocess name',15X,'I Maximum value I'/11X,'I',38X,'I', &17X,'I'/11X,58('=')/11X,'I',38X,'I',17X,'I') 2000 FORMAT(11X,'I',2X,I3,3X,A28,2X,'I',2X,1P,E12.4,3X,'I') 2100 FORMAT(11X,'I',38X,'I',17X,'I'/11X,58('=')) RETURN END C********************************************************************* SUBROUTINE PYOVLY(MOVLY) C...Initializes multiplicity distribution and selects mutliplicity C...of overlayed events, i.e. several events occuring at the same C...beam crossing. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) SAVE /LUDAT1/ SAVE /PYPARS/,/PYINT1/ DIMENSION WTI(0:100) SAVE IMAX,WTI,WTS C...Sum of allowed cross-sections for overlayed events. IF(MOVLY.EQ.1) THEN VINT(131)=VINT(106) IF(MSTP(132).GE.2) VINT(131)=VINT(131)+VINT(104) IF(MSTP(132).GE.3) VINT(131)=VINT(131)+VINT(103) IF(MSTP(132).GE.4) VINT(131)=VINT(131)+VINT(102) C...Initialize multiplicity distribution for unbiased events. IF(MSTP(133).EQ.1) THEN XNAVE=VINT(131)*PARP(131) IF(XNAVE.GT.40.) WRITE(MSTU(11),1000) XNAVE WTI(0)=EXP(-MIN(50.,XNAVE)) WTS=0. WTN=0. DO 100 I=1,100 WTI(I)=WTI(I-1)*XNAVE/I IF(I-2.5.GT.XNAVE.AND.WTI(I).LT.1E-6) GOTO 110 WTS=WTS+WTI(I) WTN=WTN+WTI(I)*I 100 IMAX=I 110 VINT(132)=XNAVE VINT(133)=WTN/WTS VINT(134)=WTS C...Initialize mutiplicity distribution for biased events. ELSEIF(MSTP(133).EQ.2) THEN XNAVE=VINT(131)*PARP(131) IF(XNAVE.GT.40.) WRITE(MSTU(11),1000) XNAVE WTI(1)=EXP(-MIN(50.,XNAVE))*XNAVE WTS=WTI(1) WTN=WTI(1) DO 120 I=2,100 WTI(I)=WTI(I-1)*XNAVE/(I-1) IF(I-2.5.GT.XNAVE.AND.WTI(I).LT.1E-6) GOTO 130 WTS=WTS+WTI(I) WTN=WTN+WTI(I)*I 120 IMAX=I 130 VINT(132)=XNAVE VINT(133)=WTN/WTS VINT(134)=WTS ENDIF C...Pick multiplicity of overlayed events. ELSE IF(MSTP(133).EQ.0) THEN MINT(81)=MAX(1,MSTP(134)) ELSE WTR=WTS*RLU(0) DO 140 I=1,IMAX MINT(81)=I WTR=WTR-WTI(I) IF(WTR.LE.0.) GOTO 150 140 CONTINUE 150 CONTINUE ENDIF ENDIF C...Format statement for error message. 1000 FORMAT(1X,'Warning: requested average number of events per bunch', &'crossing too large, ',1P,E12.4) RETURN END C********************************************************************* SUBROUTINE PYRAND C...Generates quantities characterizing the high-pT scattering at the C...parton level according to the matrix elements. Chooses incoming, C...reacting partons, their momentum fractions and one of the possible C...subprocesses. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUDAT1/,/LUDAT2/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT4/, &/PYINT5/ C...Initial values, specifically for (first) semihard interaction. MINT(17)=0 MINT(18)=0 VINT(143)=1. VINT(144)=1. IF(MSUB(95).EQ.1.OR.MINT(82).GE.2) CALL PYMULT(2) ISUB=0 100 MINT(51)=0 C...Choice of process type - first event of overlay. IF(MINT(82).EQ.1.AND.(ISUB.LE.90.OR.ISUB.GT.96)) THEN RSUB=XSEC(0,1)*RLU(0) DO 110 I=1,200 IF(MSUB(I).NE.1) GOTO 110 ISUB=I RSUB=RSUB-XSEC(I,1) IF(RSUB.LE.0.) GOTO 120 110 CONTINUE 120 IF(ISUB.EQ.95) ISUB=96 C...Choice of inclusive process type - overlayed events. ELSEIF(MINT(82).GE.2.AND.ISUB.EQ.0) THEN RSUB=VINT(131)*RLU(0) ISUB=96 IF(RSUB.GT.VINT(106)) ISUB=93 IF(RSUB.GT.VINT(106)+VINT(104)) ISUB=92 IF(RSUB.GT.VINT(106)+VINT(104)+VINT(103)) ISUB=91 ENDIF IF(MINT(82).EQ.1) NGEN(0,1)=NGEN(0,1)+1 IF(MINT(82).EQ.1) NGEN(ISUB,1)=NGEN(ISUB,1)+1 MINT(1)=ISUB C...Find resonances (explicit or implicit in cross-section). MINT(72)=0 KFR1=0 IF(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.3) THEN KFR1=KFPR(ISUB,1) ELSEIF(ISUB.GE.71.AND.ISUB.LE.77) THEN KFR1=25 ENDIF IF(KFR1.NE.0) THEN TAUR1=PMAS(KFR1,1)**2/VINT(2) GAMR1=PMAS(KFR1,1)*PMAS(KFR1,2)/VINT(2) MINT(72)=1 MINT(73)=KFR1 VINT(73)=TAUR1 VINT(74)=GAMR1 ENDIF IF(ISUB.EQ.141) THEN KFR2=23 TAUR2=PMAS(KFR2,1)**2/VINT(2) GAMR2=PMAS(KFR2,1)*PMAS(KFR2,2)/VINT(2) MINT(72)=2 MINT(74)=KFR2 VINT(75)=TAUR2 VINT(76)=GAMR2 ENDIF C...Find product masses and minimum pT of process, C...optionally with broadening according to a truncated Breit-Wigner. VINT(63)=0. VINT(64)=0. MINT(71)=0 VINT(71)=CKIN(3) IF(MINT(82).GE.2) VINT(71)=0. IF(ISET(ISUB).EQ.2.OR.ISET(ISUB).EQ.4) THEN DO 130 I=1,2 IF(KFPR(ISUB,I).EQ.0) THEN ELSEIF(MSTP(42).LE.0) THEN VINT(62+I)=PMAS(KFPR(ISUB,I),1)**2 ELSE VINT(62+I)=ULMASS(KFPR(ISUB,I))**2 ENDIF 130 CONTINUE IF(MIN(VINT(63),VINT(64)).LT.CKIN(6)**2) MINT(71)=1 IF(MINT(71).EQ.1) VINT(71)=MAX(CKIN(3),CKIN(5)) ENDIF IF(ISET(ISUB).EQ.0) THEN C...Double or single diffractive, or elastic scattering: C...choose m^2 according to 1/m^2 (diffractive), constant (elastic) IS=INT(1.5+RLU(0)) VINT(63)=VINT(3)**2 VINT(64)=VINT(4)**2 IF(ISUB.EQ.92.OR.ISUB.EQ.93) VINT(62+IS)=PARP(111)**2 IF(ISUB.EQ.93) VINT(65-IS)=PARP(111)**2 SH=VINT(2) SQM1=VINT(3)**2 SQM2=VINT(4)**2 SQM3=VINT(63) SQM4=VINT(64) SQLA12=(SH-SQM1-SQM2)**2-4.*SQM1*SQM2 SQLA34=(SH-SQM3-SQM4)**2-4.*SQM3*SQM4 THTER1=SQM1+SQM2+SQM3+SQM4-(SQM1-SQM2)*(SQM3-SQM4)/SH-SH THTER2=SQRT(MAX(0.,SQLA12))*SQRT(MAX(0.,SQLA34))/SH THL=0.5*(THTER1-THTER2) THU=0.5*(THTER1+THTER2) THM=MIN(MAX(THL,PARP(101)),THU) JTMAX=0 IF(ISUB.EQ.92.OR.ISUB.EQ.93) JTMAX=ISUB-91 DO 140 JT=1,JTMAX MINT(13+3*JT-IS*(2*JT-3))=1 SQMMIN=VINT(59+3*JT-IS*(2*JT-3)) SQMI=VINT(8-3*JT+IS*(2*JT-3))**2 SQMJ=VINT(3*JT-1-IS*(2*JT-3))**2 SQMF=VINT(68-3*JT+IS*(2*JT-3)) SQUA=0.5*SH/SQMI*((1.+(SQMI-SQMJ)/SH)*THM+SQMI-SQMF- & SQMJ**2/SH+(SQMI+SQMJ)*SQMF/SH+(SQMI-SQMJ)**2/SH**2*SQMF) QUAR=SH/SQMI*(THM*(THM+SH-SQMI-SQMJ-SQMF*(1.-(SQMI-SQMJ)/SH))+ & SQMI*SQMJ-SQMJ*SQMF*(1.+(SQMI-SQMJ-SQMF)/SH)) SQMMAX=SQUA+SQRT(MAX(0.,SQUA**2-QUAR)) IF(ABS(QUAR/SQUA**2).LT.1.E-06) SQMMAX=0.5*QUAR/SQUA SQMMAX=MIN(SQMMAX,(VINT(1)-SQRT(SQMF))**2) VINT(59+3*JT-IS*(2*JT-3))=SQMMIN*(SQMMAX/SQMMIN)**RLU(0) 140 CONTINUE C...Choose t-hat according to exp(B*t-hat+C*t-hat^2). SQM3=VINT(63) SQM4=VINT(64) SQLA34=(SH-SQM3-SQM4)**2-4.*SQM3*SQM4 THTER1=SQM1+SQM2+SQM3+SQM4-(SQM1-SQM2)*(SQM3-SQM4)/SH-SH THTER2=SQRT(MAX(0.,SQLA12))*SQRT(MAX(0.,SQLA34))/SH THL=0.5*(THTER1-THTER2) THU=0.5*(THTER1+THTER2) B=VINT(121) C=VINT(122) IF(ISUB.EQ.92.OR.ISUB.EQ.93) THEN B=0.5*B C=0.5*C ENDIF THM=MIN(MAX(THL,PARP(101)),THU) EXPTH=0. THARG=B*(THM-THU) IF(THARG.GT.-20.) EXPTH=EXP(THARG) 150 TH=THU+LOG(EXPTH+(1.-EXPTH)*RLU(0))/B TH=MAX(THM,MIN(THU,TH)) RATLOG=MIN((B+C*(TH+THM))*(TH-THM),(B+C*(TH+THU))*(TH-THU)) IF(RATLOG.LT.LOG(RLU(0))) GOTO 150 VINT(21)=1. VINT(22)=0. VINT(23)=MIN(1.,MAX(-1.,(2.*TH-THTER1)/THTER2)) C...Note: in the following, by In is meant the integral over the C...quantity multiplying coefficient cn. C...Choose tau according to h1(tau)/tau, where C...h1(tau) = c0 + I0/I1*c1*1/tau + I0/I2*c2*1/(tau+tau_R) + C...I0/I3*c3*tau/((s*tau-m^2)^2+(m*Gamma)^2) + C...I0/I4*c4*1/(tau+tau_R') + C...I0/I5*c5*tau/((s*tau-m'^2)^2+(m'*Gamma')^2), and C...c0 + c1 + c2 + c3 + c4 + c5 = 1 ELSEIF(ISET(ISUB).GE.1.AND.ISET(ISUB).LE.4) THEN CALL PYKLIM(1) IF(MINT(51).NE.0) GOTO 100 RTAU=RLU(0) MTAU=1 IF(RTAU.GT.COEF(ISUB,1)) MTAU=2 IF(RTAU.GT.COEF(ISUB,1)+COEF(ISUB,2)) MTAU=3 IF(RTAU.GT.COEF(ISUB,1)+COEF(ISUB,2)+COEF(ISUB,3)) MTAU=4 IF(RTAU.GT.COEF(ISUB,1)+COEF(ISUB,2)+COEF(ISUB,3)+COEF(ISUB,4)) & MTAU=5 IF(RTAU.GT.COEF(ISUB,1)+COEF(ISUB,2)+COEF(ISUB,3)+COEF(ISUB,4)+ & COEF(ISUB,5)) MTAU=6 CALL PYKMAP(1,MTAU,RLU(0)) C...2 -> 3, 4 processes: C...Choose tau' according to h4(tau,tau')/tau', where C...h4(tau,tau') = c0 + I0/I1*c1*(1 - tau/tau')^3/tau', and C...c0 + c1 = 1. IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) THEN CALL PYKLIM(4) IF(MINT(51).NE.0) GOTO 100 RTAUP=RLU(0) MTAUP=1 IF(RTAUP.GT.COEF(ISUB,15)) MTAUP=2 CALL PYKMAP(4,MTAUP,RLU(0)) ENDIF C...Choose y* according to h2(y*), where C...h2(y*) = I0/I1*c1*(y*-y*min) + I0/I2*c2*(y*max-y*) + C...I0/I3*c3*1/cosh(y*), I0 = y*max-y*min, and c1 + c2 + c3 = 1. CALL PYKLIM(2) IF(MINT(51).NE.0) GOTO 100 RYST=RLU(0) MYST=1 IF(RYST.GT.COEF(ISUB,7)) MYST=2 IF(RYST.GT.COEF(ISUB,7)+COEF(ISUB,8)) MYST=3 CALL PYKMAP(2,MYST,RLU(0)) C...2 -> 2 processes: C...Choose cos(theta-hat) (cth) according to h3(cth), where C...h3(cth) = c0 + I0/I1*c1*1/(A - cth) + I0/I2*c2*1/(A + cth) + C...I0/I3*c3*1/(A - cth)^2 + I0/I4*c4*1/(A + cth)^2, C...A = 1 + 2*(m3*m4/sh)^2 (= 1 for massless products), C...and c0 + c1 + c2 + c3 + c4 = 1. CALL PYKLIM(3) IF(MINT(51).NE.0) GOTO 100 IF(ISET(ISUB).EQ.2.OR.ISET(ISUB).EQ.4) THEN RCTH=RLU(0) MCTH=1 IF(RCTH.GT.COEF(ISUB,10)) MCTH=2 IF(RCTH.GT.COEF(ISUB,10)+COEF(ISUB,11)) MCTH=3 IF(RCTH.GT.COEF(ISUB,10)+COEF(ISUB,11)+COEF(ISUB,12)) MCTH=4 IF(RCTH.GT.COEF(ISUB,10)+COEF(ISUB,11)+COEF(ISUB,12)+ & COEF(ISUB,13)) MCTH=5 CALL PYKMAP(3,MCTH,RLU(0)) ENDIF C...Low-pT or multiple interactions (first semihard interaction). ELSEIF(ISET(ISUB).EQ.5) THEN CALL PYMULT(3) ISUB=MINT(1) ENDIF C...Choose azimuthal angle. VINT(24)=PARU(2)*RLU(0) C...Check against user cuts on kinematics at parton level. MINT(51)=0 IF(ISUB.LE.90.OR.ISUB.GT.100) CALL PYKLIM(0) IF(MINT(51).NE.0) GOTO 100 IF(MINT(82).EQ.1.AND.MSTP(141).GE.1) THEN MCUT=0 IF(MSUB(91)+MSUB(92)+MSUB(93)+MSUB(94)+MSUB(95).EQ.0) & CALL PYKCUT(MCUT) IF(MCUT.NE.0) GOTO 100 ENDIF C...Calculate differential cross-section for different subprocesses. CALL PYSIGH(NCHN,SIGS) C...Calculations for Monte Carlo estimate of all cross-sections. IF(MINT(82).EQ.1.AND.ISUB.LE.90.OR.ISUB.GE.96) THEN XSEC(ISUB,2)=XSEC(ISUB,2)+SIGS ELSEIF(MINT(82).EQ.1) THEN XSEC(ISUB,2)=XSEC(ISUB,2)+XSEC(ISUB,1) ENDIF C...Multiple interactions: store results of cross-section calculation. IF(MINT(43).EQ.4.AND.MSTP(82).GE.3) THEN VINT(153)=SIGS CALL PYMULT(4) ENDIF C...Weighting using estimate of maximum of differential cross-section. VIOL=SIGS/XSEC(ISUB,1) IF(VIOL.LT.RLU(0)) GOTO 100 C...Check for possible violation of estimated maximum of differential C...cross-section used in weighting. IF(MSTP(123).LE.0) THEN IF(VIOL.GT.1.) THEN WRITE(MSTU(11),1000) VIOL,NGEN(0,3)+1 WRITE(MSTU(11),1100) ISUB,VINT(21),VINT(22),VINT(23),VINT(26) STOP ENDIF ELSEIF(MSTP(123).EQ.1) THEN IF(VIOL.GT.VINT(108)) THEN VINT(108)=VIOL IF(VIOL.GT.1.) THEN WRITE(MSTU(11),1200) VIOL,NGEN(0,3)+1 WRITE(MSTU(11),1100) ISUB,VINT(21),VINT(22),VINT(23), & VINT(26) ENDIF ENDIF ELSEIF(VIOL.GT.VINT(108)) THEN VINT(108)=VIOL IF(VIOL.GT.1.) THEN XDIF=XSEC(ISUB,1)*(VIOL-1.) XSEC(ISUB,1)=XSEC(ISUB,1)+XDIF IF(MSUB(ISUB).EQ.1.AND.(ISUB.LE.90.OR.ISUB.GT.96)) & XSEC(0,1)=XSEC(0,1)+XDIF WRITE(MSTU(11),1200) VIOL,NGEN(0,3)+1 WRITE(MSTU(11),1100) ISUB,VINT(21),VINT(22),VINT(23),VINT(26) IF(ISUB.LE.9) THEN WRITE(MSTU(11),1300) ISUB,XSEC(ISUB,1) ELSEIF(ISUB.LE.99) THEN WRITE(MSTU(11),1400) ISUB,XSEC(ISUB,1) ELSE WRITE(MSTU(11),1500) ISUB,XSEC(ISUB,1) ENDIF VINT(108)=1. ENDIF ENDIF C...Multiple interactions: choose impact parameter. VINT(148)=1. IF(MINT(43).EQ.4.AND.(ISUB.LE.90.OR.ISUB.GE.96).AND.MSTP(82).GE.3) &THEN CALL PYMULT(5) IF(VINT(150).LT.RLU(0)) GOTO 100 ENDIF IF(MINT(82).EQ.1.AND.MSUB(95).EQ.1) THEN IF(ISUB.LE.90.OR.ISUB.GE.95) NGEN(95,1)=NGEN(95,1)+1 IF(ISUB.LE.90.OR.ISUB.GE.96) NGEN(96,2)=NGEN(96,2)+1 ENDIF IF(ISUB.LE.90.OR.ISUB.GE.96) MINT(31)=MINT(31)+1 C...Choose flavour of reacting partons (and subprocess). RSIGS=SIGS*RLU(0) QT2=VINT(48) RQQBAR=PARP(87)*(1.-(QT2/(QT2+(PARP(88)*PARP(82))**2))**2) IF(ISUB.NE.95.AND.(ISUB.NE.96.OR.MSTP(82).LE.1.OR. &RLU(0).GT.RQQBAR)) THEN DO 190 ICHN=1,NCHN KFL1=ISIG(ICHN,1) KFL2=ISIG(ICHN,2) MINT(2)=ISIG(ICHN,3) RSIGS=RSIGS-SIGH(ICHN) IF(RSIGS.LE.0.) GOTO 210 190 CONTINUE C...Multiple interactions: choose qqbar preferentially at small pT. ELSEIF(ISUB.EQ.96) THEN CALL PYSPLI(MINT(11),21,KFL1,KFLDUM) CALL PYSPLI(MINT(12),21,KFL2,KFLDUM) MINT(1)=11 MINT(2)=1 IF(KFL1.EQ.KFL2.AND.RLU(0).LT.0.5) MINT(2)=2 C...Low-pT: choose string drawing configuration. ELSE KFL1=21 KFL2=21 RSIGS=6.*RLU(0) MINT(2)=1 IF(RSIGS.GT.1.) MINT(2)=2 IF(RSIGS.GT.2.) MINT(2)=3 ENDIF C...Reassign QCD process. Partons before initial state radiation. 210 IF(MINT(2).GT.10) THEN MINT(1)=MINT(2)/10 MINT(2)=MOD(MINT(2),10) ENDIF MINT(15)=KFL1 MINT(16)=KFL2 MINT(13)=MINT(15) MINT(14)=MINT(16) VINT(141)=VINT(41) VINT(142)=VINT(42) C...Format statements for differential cross-section maximum violations. 1000 FORMAT(1X,'Error: maximum violated by',1P,E11.3,1X, &'in event',1X,I7,'.'/1X,'Execution stopped!') 1100 FORMAT(1X,'ISUB = ',I3,'; Point of violation:'/1X,'tau =',1P, &E11.3,', y* =',E11.3,', cthe = ',0P,F11.7,', tau'' =',1P,E11.3) 1200 FORMAT(1X,'Warning: maximum violated by',1P,E11.3,1X, &'in event',1X,I7) 1300 FORMAT(1X,'XSEC(',I1,',1) increased to',1P,E11.3) 1400 FORMAT(1X,'XSEC(',I2,',1) increased to',1P,E11.3) 1500 FORMAT(1X,'XSEC(',I3,',1) increased to',1P,E11.3) RETURN END C********************************************************************* SUBROUTINE PYSCAT C...Finds outgoing flavours and event type; sets up the kinematics C...and colour flow of the hard scattering. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT4/, &/PYINT5/ DIMENSION WDTP(0:40),WDTE(0:40,0:5),PMQ(2),Z(2),CTHE(2),PHI(2) C...Choice of subprocess, number of documentation lines. ISUB=MINT(1) IDOC=6+ISET(ISUB) IF(ISUB.EQ.95) IDOC=8 MINT(3)=IDOC-6 IF(IDOC.GE.9) IDOC=IDOC+2 MINT(4)=IDOC IPU1=MINT(84)+1 IPU2=MINT(84)+2 IPU3=MINT(84)+3 IPU4=MINT(84)+4 IPU5=MINT(84)+5 IPU6=MINT(84)+6 C...Reset K, P and V vectors. Store incoming particles. DO 100 JT=1,MSTP(126)+10 I=MINT(83)+JT DO 100 J=1,5 K(I,J)=0 P(I,J)=0. 100 V(I,J)=0. DO 110 JT=1,2 I=MINT(83)+JT K(I,1)=21 K(I,2)=MINT(10+JT) P(I,1)=0. P(I,2)=0. P(I,5)=VINT(2+JT) P(I,3)=VINT(5)*(-1)**(JT+1) 110 P(I,4)=SQRT(P(I,3)**2+P(I,5)**2) MINT(6)=2 KFRES=0 C...Store incoming partons in their CM-frame. SH=VINT(44) SHR=SQRT(SH) SHP=VINT(26)*VINT(2) SHPR=SQRT(SHP) SHUSER=SHR IF(ISET(ISUB).GE.3) SHUSER=SHPR DO 120 JT=1,2 I=MINT(84)+JT K(I,1)=14 K(I,2)=MINT(14+JT) K(I,3)=MINT(83)+2+JT 120 P(I,5)=ULMASS(K(I,2)) IF(P(IPU1,5)+P(IPU2,5).GE.SHUSER) THEN P(IPU1,5)=0. P(IPU2,5)=0. ENDIF P(IPU1,4)=0.5*(SHUSER+(P(IPU1,5)**2-P(IPU2,5)**2)/SHUSER) P(IPU1,3)=SQRT(MAX(0.,P(IPU1,4)**2-P(IPU1,5)**2)) P(IPU2,4)=SHUSER-P(IPU1,4) P(IPU2,3)=-P(IPU1,3) C...Copy incoming partons to documentation lines. DO 130 JT=1,2 I1=MINT(83)+4+JT I2=MINT(84)+JT K(I1,1)=21 K(I1,2)=K(I2,2) K(I1,3)=I1-2 DO 130 J=1,5 130 P(I1,J)=P(I2,J) C...Choose new quark flavour for relevant annihilation graphs. IF(ISUB.EQ.12.OR.ISUB.EQ.53) THEN CALL PYWIDT(21,SHR,WDTP,WDTE) RKFL=(WDTE(0,1)+WDTE(0,2)+WDTE(0,4))*RLU(0) DO 140 I=1,2*MSTP(1) KFLQ=I RKFL=RKFL-(WDTE(I,1)+WDTE(I,2)+WDTE(I,4)) IF(RKFL.LE.0.) GOTO 150 140 CONTINUE 150 CONTINUE ENDIF C...Final state flavours and colour flow: default values. JS=1 MINT(21)=MINT(15) MINT(22)=MINT(16) MINT(23)=0 MINT(24)=0 KCC=20 KCS=ISIGN(1,MINT(15)) IF(ISUB.LE.10) THEN IF(ISUB.EQ.1) THEN C...f + fb -> gamma*/Z0. KFRES=23 ELSEIF(ISUB.EQ.2) THEN C...f + fb' -> W+/- . KCH1=KCHG(IABS(MINT(15)),1)*ISIGN(1,MINT(15)) KCH2=KCHG(IABS(MINT(16)),1)*ISIGN(1,MINT(16)) KFRES=ISIGN(24,KCH1+KCH2) ELSEIF(ISUB.EQ.3) THEN C...f + fb -> H0. KFRES=25 ELSEIF(ISUB.EQ.4) THEN C...gamma + W+/- -> W+/-. ELSEIF(ISUB.EQ.5) THEN C...Z0 + Z0 -> H0. XH=SH/SHP MINT(21)=MINT(15) MINT(22)=MINT(16) PMQ(1)=ULMASS(MINT(21)) PMQ(2)=ULMASS(MINT(22)) 240 JT=INT(1.5+RLU(0)) ZMIN=2.*PMQ(JT)/SHPR ZMAX=1.-PMQ(3-JT)/SHPR-(SH-PMQ(JT)**2)/(SHPR*(SHPR-PMQ(3-JT))) ZMAX=MIN(1.-XH,ZMAX) Z(JT)=ZMIN+(ZMAX-ZMIN)*RLU(0) IF(-1.+(1.+XH)/(1.-Z(JT))-XH/(1.-Z(JT))**2.LT. & (1.-XH)**2/(4.*XH)*RLU(0)) GOTO 240 SQC1=1.-4.*PMQ(JT)**2/(Z(JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 240 C1=SQRT(SQC1) C2=1.+2.*(PMAS(23,1)**2-PMQ(JT)**2)/(Z(JT)*SHP) CTHE(JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(JT)=MIN(1.,MAX(-1.,CTHE(JT))) Z(3-JT)=1.-XH/(1.-Z(JT)) SQC1=1.-4.*PMQ(3-JT)**2/(Z(3-JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 240 C1=SQRT(SQC1) C2=1.+2.*(PMAS(23,1)**2-PMQ(3-JT)**2)/(Z(3-JT)*SHP) CTHE(3-JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(3-JT)=MIN(1.,MAX(-1.,CTHE(3-JT))) PHIR=PARU(2)*RLU(0) CPHI=COS(PHIR) ANG=CTHE(1)*CTHE(2)-SQRT(1.-CTHE(1)**2)*SQRT(1.-CTHE(2)**2)*CPHI Z1=2.-Z(JT) Z2=ANG*SQRT(Z(JT)**2-4.*PMQ(JT)**2/SHP) Z3=1.-Z(JT)-XH+(PMQ(1)**2+PMQ(2)**2)/SHP Z(3-JT)=2./(Z1**2-Z2**2)*(Z1*Z3+Z2*SQRT(Z3**2-(Z1**2-Z2**2)* & PMQ(3-JT)**2/SHP)) ZMIN=2.*PMQ(3-JT)/SHPR ZMAX=1.-PMQ(JT)/SHPR-(SH-PMQ(3-JT)**2)/(SHPR*(SHPR-PMQ(JT))) ZMAX=MIN(1.-XH,ZMAX) IF(Z(3-JT).LT.ZMIN.OR.Z(3-JT).GT.ZMAX) GOTO 240 KCC=22 KFRES=25 ELSEIF(ISUB.EQ.6) THEN C...Z0 + W+/- -> W+/-. ELSEIF(ISUB.EQ.7) THEN C...W+ + W- -> Z0. ELSEIF(ISUB.EQ.8) THEN C...W+ + W- -> H0. XH=SH/SHP 250 DO 280 JT=1,2 I=MINT(14+JT) IA=IABS(I) IF(IA.LE.10) THEN RVCKM=VINT(180+I)*RLU(0) DO 270 J=1,MSTP(1) IB=2*J-1+MOD(IA,2) IPM=(5-ISIGN(1,I))/2 IDC=J+MDCY(IA,2)+2 IF(MDME(IDC,1).NE.1.AND.MDME(IDC,1).NE.IPM) GOTO 270 MINT(20+JT)=ISIGN(IB,I) RVCKM=RVCKM-VCKM((IA+1)/2,(IB+1)/2) IF(RVCKM.LE.0.) GOTO 280 270 CONTINUE ELSE IB=2*((IA+1)/2)-1+MOD(IA,2) MINT(20+JT)=ISIGN(IB,I) ENDIF 280 PMQ(JT)=ULMASS(MINT(20+JT)) JT=INT(1.5+RLU(0)) ZMIN=2.*PMQ(JT)/SHPR ZMAX=1.-PMQ(3-JT)/SHPR-(SH-PMQ(JT)**2)/(SHPR*(SHPR-PMQ(3-JT))) ZMAX=MIN(1.-XH,ZMAX) Z(JT)=ZMIN+(ZMAX-ZMIN)*RLU(0) IF(-1.+(1.+XH)/(1.-Z(JT))-XH/(1.-Z(JT))**2.LT. & (1.-XH)**2/(4.*XH)*RLU(0)) GOTO 250 SQC1=1.-4.*PMQ(JT)**2/(Z(JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 250 C1=SQRT(SQC1) C2=1.+2.*(PMAS(24,1)**2-PMQ(JT)**2)/(Z(JT)*SHP) CTHE(JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(JT)=MIN(1.,MAX(-1.,CTHE(JT))) Z(3-JT)=1.-XH/(1.-Z(JT)) SQC1=1.-4.*PMQ(3-JT)**2/(Z(3-JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 250 C1=SQRT(SQC1) C2=1.+2.*(PMAS(24,1)**2-PMQ(3-JT)**2)/(Z(3-JT)*SHP) CTHE(3-JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(3-JT)=MIN(1.,MAX(-1.,CTHE(3-JT))) PHIR=PARU(2)*RLU(0) CPHI=COS(PHIR) ANG=CTHE(1)*CTHE(2)-SQRT(1.-CTHE(1)**2)*SQRT(1.-CTHE(2)**2)*CPHI Z1=2.-Z(JT) Z2=ANG*SQRT(Z(JT)**2-4.*PMQ(JT)**2/SHP) Z3=1.-Z(JT)-XH+(PMQ(1)**2+PMQ(2)**2)/SHP Z(3-JT)=2./(Z1**2-Z2**2)*(Z1*Z3+Z2*SQRT(Z3**2-(Z1**2-Z2**2)* & PMQ(3-JT)**2/SHP)) ZMIN=2.*PMQ(3-JT)/SHPR ZMAX=1.-PMQ(JT)/SHPR-(SH-PMQ(3-JT)**2)/(SHPR*(SHPR-PMQ(JT))) ZMAX=MIN(1.-XH,ZMAX) IF(Z(3-JT).LT.ZMIN.OR.Z(3-JT).GT.ZMAX) GOTO 250 KCC=22 KFRES=25 ENDIF ELSEIF(ISUB.LE.20) THEN IF(ISUB.EQ.11) THEN C...f + f' -> f + f'; th = (p(f)-p(f))**2. KCC=MINT(2) IF(MINT(15)*MINT(16).LT.0) KCC=KCC+2 ELSEIF(ISUB.EQ.12) THEN C...f + fb -> f' + fb'; th = (p(f)-p(f'))**2. MINT(21)=ISIGN(KFLQ,MINT(15)) MINT(22)=-MINT(21) KCC=4 ELSEIF(ISUB.EQ.13) THEN C...f + fb -> g + g; th arbitrary. MINT(21)=21 MINT(22)=21 KCC=MINT(2)+4 ELSEIF(ISUB.EQ.14) THEN C...f + fb -> g + gam; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=21 MINT(23-JS)=22 KCC=17+JS ELSEIF(ISUB.EQ.15) THEN C...f + fb -> g + Z0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=21 MINT(23-JS)=23 KCC=17+JS ELSEIF(ISUB.EQ.16) THEN C...f + fb' -> g + W+/-; th = (p(f)-p(W-))**2 or (p(fb')-p(W+))**2. KCH1=KCHG(IABS(MINT(15)),1)*ISIGN(1,MINT(15)) KCH2=KCHG(IABS(MINT(16)),1)*ISIGN(1,MINT(16)) IF(MINT(15)*(KCH1+KCH2).LT.0) JS=2 MINT(20+JS)=21 MINT(23-JS)=ISIGN(24,KCH1+KCH2) KCC=17+JS ELSEIF(ISUB.EQ.17) THEN C...f + fb -> g + H0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=21 MINT(23-JS)=25 KCC=17+JS ELSEIF(ISUB.EQ.18) THEN C...f + fb -> gamma + gamma; th arbitrary. MINT(21)=22 MINT(22)=22 ELSEIF(ISUB.EQ.19) THEN C...f + fb -> gamma + Z0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=22 MINT(23-JS)=23 ELSEIF(ISUB.EQ.20) THEN C...f + fb' -> gamma + W+/-; th = (p(f)-p(W-))**2 or (p(fb')-p(W+))**2. KCH1=KCHG(IABS(MINT(15)),1)*ISIGN(1,MINT(15)) KCH2=KCHG(IABS(MINT(16)),1)*ISIGN(1,MINT(16)) IF(MINT(15)*(KCH1+KCH2).LT.0) JS=2 MINT(20+JS)=22 MINT(23-JS)=ISIGN(24,KCH1+KCH2) ENDIF ELSEIF(ISUB.LE.30) THEN IF(ISUB.EQ.21) THEN C...f + fb -> gamma + H0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=22 MINT(23-JS)=25 ELSEIF(ISUB.EQ.22) THEN C...f + fb -> Z0 + Z0; th arbitrary. MINT(21)=23 MINT(22)=23 ELSEIF(ISUB.EQ.23) THEN C...f + fb' -> Z0 + W+/-; th = (p(f)-p(W-))**2 or (p(fb')-p(W+))**2. KCH1=KCHG(IABS(MINT(15)),1)*ISIGN(1,MINT(15)) KCH2=KCHG(IABS(MINT(16)),1)*ISIGN(1,MINT(16)) IF(MINT(15)*(KCH1+KCH2).LT.0) JS=2 MINT(20+JS)=23 MINT(23-JS)=ISIGN(24,KCH1+KCH2) ELSEIF(ISUB.EQ.24) THEN C...f + fb -> Z0 + H0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=23 MINT(23-JS)=25 ELSEIF(ISUB.EQ.25) THEN C...f + fb -> W+ + W-; th = (p(f)-p(W-))**2. MINT(21)=-ISIGN(24,MINT(15)) MINT(22)=-MINT(21) ELSEIF(ISUB.EQ.26) THEN C...f + fb' -> W+/- + H0; th = (p(f)-p(W-))**2 or (p(fb')-p(W+))**2. KCH1=KCHG(IABS(MINT(15)),1)*ISIGN(1,MINT(15)) KCH2=KCHG(IABS(MINT(16)),1)*ISIGN(1,MINT(16)) IF(MINT(15)*(KCH1+KCH2).GT.0) JS=2 MINT(20+JS)=ISIGN(24,KCH1+KCH2) MINT(23-JS)=25 ELSEIF(ISUB.EQ.27) THEN C...f + fb -> H0 + H0. ELSEIF(ISUB.EQ.28) THEN C...f + g -> f + g; th = (p(f)-p(f))**2. KCC=MINT(2)+6 IF(MINT(15).EQ.21) KCC=KCC+2 IF(MINT(15).NE.21) KCS=ISIGN(1,MINT(15)) IF(MINT(16).NE.21) KCS=ISIGN(1,MINT(16)) ELSEIF(ISUB.EQ.29) THEN C...f + g -> f + gamma; th = (p(f)-p(f))**2. IF(MINT(15).EQ.21) JS=2 MINT(23-JS)=22 KCC=15+JS KCS=ISIGN(1,MINT(14+JS)) ELSEIF(ISUB.EQ.30) THEN C...f + g -> f + Z0; th = (p(f)-p(f))**2. IF(MINT(15).EQ.21) JS=2 MINT(23-JS)=23 KCC=15+JS KCS=ISIGN(1,MINT(14+JS)) ENDIF ELSEIF(ISUB.LE.40) THEN IF(ISUB.EQ.31) THEN C...f + g -> f' + W+/-; th = (p(f)-p(f'))**2; choose flavour f'. IF(MINT(15).EQ.21) JS=2 I=MINT(14+JS) IA=IABS(I) MINT(23-JS)=ISIGN(24,KCHG(IA,1)*I) RVCKM=VINT(180+I)*RLU(0) DO 220 J=1,MSTP(1) IB=2*J-1+MOD(IA,2) IPM=(5-ISIGN(1,I))/2 IDC=J+MDCY(IA,2)+2 IF(MDME(IDC,1).NE.1.AND.MDME(IDC,1).NE.IPM) GOTO 220 MINT(20+JS)=ISIGN(IB,I) RVCKM=RVCKM-VCKM((IA+1)/2,(IB+1)/2) IF(RVCKM.LE.0.) GOTO 230 220 CONTINUE 230 KCC=15+JS KCS=ISIGN(1,MINT(14+JS)) ELSEIF(ISUB.EQ.32) THEN C...f + g -> f + H0; th = (p(f)-p(f))**2. IF(MINT(15).EQ.21) JS=2 MINT(23-JS)=25 KCC=15+JS KCS=ISIGN(1,MINT(14+JS)) ELSEIF(ISUB.EQ.33) THEN C...f + gamma -> f + g. ELSEIF(ISUB.EQ.34) THEN C...f + gamma -> f + gamma. ELSEIF(ISUB.EQ.35) THEN C...f + gamma -> f + Z0. ELSEIF(ISUB.EQ.36) THEN C...f + gamma -> f' + W+/-. ELSEIF(ISUB.EQ.37) THEN C...f + gamma -> f + H0. ELSEIF(ISUB.EQ.38) THEN C...f + Z0 -> f + g. ELSEIF(ISUB.EQ.39) THEN C...f + Z0 -> f + gamma. ELSEIF(ISUB.EQ.40) THEN C...f + Z0 -> f + Z0. ENDIF ELSEIF(ISUB.LE.50) THEN IF(ISUB.EQ.41) THEN C...f + Z0 -> f' + W+/-. ELSEIF(ISUB.EQ.42) THEN C...f + Z0 -> f + H0. ELSEIF(ISUB.EQ.43) THEN C...f + W+/- -> f' + g. ELSEIF(ISUB.EQ.44) THEN C...f + W+/- -> f' + gamma. ELSEIF(ISUB.EQ.45) THEN C...f + W+/- -> f' + Z0. ELSEIF(ISUB.EQ.46) THEN C...f + W+/- -> f' + W+/-. ELSEIF(ISUB.EQ.47) THEN C...f + W+/- -> f' + H0. ELSEIF(ISUB.EQ.48) THEN C...f + H0 -> f + g. ELSEIF(ISUB.EQ.49) THEN C...f + H0 -> f + gamma. ELSEIF(ISUB.EQ.50) THEN C...f + H0 -> f + Z0. ENDIF ELSEIF(ISUB.LE.60) THEN IF(ISUB.EQ.51) THEN C...f + H0 -> f' + W+/-. ELSEIF(ISUB.EQ.52) THEN C...f + H0 -> f + H0. ELSEIF(ISUB.EQ.53) THEN C...g + g -> f + fb; th arbitrary. KCS=(-1)**INT(1.5+RLU(0)) MINT(21)=ISIGN(KFLQ,KCS) MINT(22)=-MINT(21) KCC=MINT(2)+10 ELSEIF(ISUB.EQ.54) THEN C...g + gamma -> f + fb. ELSEIF(ISUB.EQ.55) THEN C...g + Z0 -> f + fb. ELSEIF(ISUB.EQ.56) THEN C...g + W+/- -> f + fb'. ELSEIF(ISUB.EQ.57) THEN C...g + H0 -> f + fb. ELSEIF(ISUB.EQ.58) THEN C...gamma + gamma -> f + fb. ELSEIF(ISUB.EQ.59) THEN C...gamma + Z0 -> f + fb. ELSEIF(ISUB.EQ.60) THEN C...gamma + W+/- -> f + fb'. ENDIF ELSEIF(ISUB.LE.70) THEN IF(ISUB.EQ.61) THEN C...gamma + H0 -> f + fb. ELSEIF(ISUB.EQ.62) THEN C...Z0 + Z0 -> f + fb. ELSEIF(ISUB.EQ.63) THEN C...Z0 + W+/- -> f + fb'. ELSEIF(ISUB.EQ.64) THEN C...Z0 + H0 -> f + fb. ELSEIF(ISUB.EQ.65) THEN C...W+ + W- -> f + fb. ELSEIF(ISUB.EQ.66) THEN C...W+/- + H0 -> f + fb'. ELSEIF(ISUB.EQ.67) THEN C...H0 + H0 -> f + fb. ELSEIF(ISUB.EQ.68) THEN C...g + g -> g + g; th arbitrary. KCC=MINT(2)+12 KCS=(-1)**INT(1.5+RLU(0)) ELSEIF(ISUB.EQ.69) THEN C...gamma + gamma -> W+ + W-. ELSEIF(ISUB.EQ.70) THEN C...gamma + W+/- -> gamma + W+/- ENDIF ELSEIF(ISUB.LE.80) THEN IF(ISUB.EQ.71.OR.ISUB.EQ.72) THEN C...Z0 + Z0 -> Z0 + Z0; Z0 + Z0 -> W+ + W-. XH=SH/SHP MINT(21)=MINT(15) MINT(22)=MINT(16) PMQ(1)=ULMASS(MINT(21)) PMQ(2)=ULMASS(MINT(22)) 290 JT=INT(1.5+RLU(0)) ZMIN=2.*PMQ(JT)/SHPR ZMAX=1.-PMQ(3-JT)/SHPR-(SH-PMQ(JT)**2)/(SHPR*(SHPR-PMQ(3-JT))) ZMAX=MIN(1.-XH,ZMAX) Z(JT)=ZMIN+(ZMAX-ZMIN)*RLU(0) IF(-1.+(1.+XH)/(1.-Z(JT))-XH/(1.-Z(JT))**2.LT. & (1.-XH)**2/(4.*XH)*RLU(0)) GOTO 290 SQC1=1.-4.*PMQ(JT)**2/(Z(JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 290 C1=SQRT(SQC1) C2=1.+2.*(PMAS(23,1)**2-PMQ(JT)**2)/(Z(JT)*SHP) CTHE(JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(JT)=MIN(1.,MAX(-1.,CTHE(JT))) Z(3-JT)=1.-XH/(1.-Z(JT)) SQC1=1.-4.*PMQ(3-JT)**2/(Z(3-JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 290 C1=SQRT(SQC1) C2=1.+2.*(PMAS(23,1)**2-PMQ(3-JT)**2)/(Z(3-JT)*SHP) CTHE(3-JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(3-JT)=MIN(1.,MAX(-1.,CTHE(3-JT))) PHIR=PARU(2)*RLU(0) CPHI=COS(PHIR) ANG=CTHE(1)*CTHE(2)-SQRT(1.-CTHE(1)**2)*SQRT(1.-CTHE(2)**2)*CPHI Z1=2.-Z(JT) Z2=ANG*SQRT(Z(JT)**2-4.*PMQ(JT)**2/SHP) Z3=1.-Z(JT)-XH+(PMQ(1)**2+PMQ(2)**2)/SHP Z(3-JT)=2./(Z1**2-Z2**2)*(Z1*Z3+Z2*SQRT(Z3**2-(Z1**2-Z2**2)* & PMQ(3-JT)**2/SHP)) ZMIN=2.*PMQ(3-JT)/SHPR ZMAX=1.-PMQ(JT)/SHPR-(SH-PMQ(3-JT)**2)/(SHPR*(SHPR-PMQ(JT))) ZMAX=MIN(1.-XH,ZMAX) IF(Z(3-JT).LT.ZMIN.OR.Z(3-JT).GT.ZMAX) GOTO 290 KCC=22 ELSEIF(ISUB.EQ.73) THEN C...Z0 + W+/- -> Z0 + W+/-. XH=SH/SHP 300 JT=INT(1.5+RLU(0)) I=MINT(14+JT) IA=IABS(I) IF(IA.LE.10) THEN RVCKM=VINT(180+I)*RLU(0) DO 320 J=1,MSTP(1) IB=2*J-1+MOD(IA,2) IPM=(5-ISIGN(1,I))/2 IDC=J+MDCY(IA,2)+2 IF(MDME(IDC,1).NE.1.AND.MDME(IDC,1).NE.IPM) GOTO 320 MINT(20+JT)=ISIGN(IB,I) RVCKM=RVCKM-VCKM((IA+1)/2,(IB+1)/2) IF(RVCKM.LE.0.) GOTO 330 320 CONTINUE ELSE IB=2*((IA+1)/2)-1+MOD(IA,2) MINT(20+JT)=ISIGN(IB,I) ENDIF 330 PMQ(JT)=ULMASS(MINT(20+JT)) MINT(23-JT)=MINT(17-JT) PMQ(3-JT)=ULMASS(MINT(23-JT)) JT=INT(1.5+RLU(0)) ZMIN=2.*PMQ(JT)/SHPR ZMAX=1.-PMQ(3-JT)/SHPR-(SH-PMQ(JT)**2)/(SHPR*(SHPR-PMQ(3-JT))) ZMAX=MIN(1.-XH,ZMAX) Z(JT)=ZMIN+(ZMAX-ZMIN)*RLU(0) IF(-1.+(1.+XH)/(1.-Z(JT))-XH/(1.-Z(JT))**2.LT. & (1.-XH)**2/(4.*XH)*RLU(0)) GOTO 300 SQC1=1.-4.*PMQ(JT)**2/(Z(JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 300 C1=SQRT(SQC1) C2=1.+2.*(PMAS(23,1)**2-PMQ(JT)**2)/(Z(JT)*SHP) CTHE(JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(JT)=MIN(1.,MAX(-1.,CTHE(JT))) Z(3-JT)=1.-XH/(1.-Z(JT)) SQC1=1.-4.*PMQ(3-JT)**2/(Z(3-JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 300 C1=SQRT(SQC1) C2=1.+2.*(PMAS(23,1)**2-PMQ(3-JT)**2)/(Z(3-JT)*SHP) CTHE(3-JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(3-JT)=MIN(1.,MAX(-1.,CTHE(3-JT))) PHIR=PARU(2)*RLU(0) CPHI=COS(PHIR) ANG=CTHE(1)*CTHE(2)-SQRT(1.-CTHE(1)**2)*SQRT(1.-CTHE(2)**2)*CPHI Z1=2.-Z(JT) Z2=ANG*SQRT(Z(JT)**2-4.*PMQ(JT)**2/SHP) Z3=1.-Z(JT)-XH+(PMQ(1)**2+PMQ(2)**2)/SHP Z(3-JT)=2./(Z1**2-Z2**2)*(Z1*Z3+Z2*SQRT(Z3**2-(Z1**2-Z2**2)* & PMQ(3-JT)**2/SHP)) ZMIN=2.*PMQ(3-JT)/SHPR ZMAX=1.-PMQ(JT)/SHPR-(SH-PMQ(3-JT)**2)/(SHPR*(SHPR-PMQ(JT))) ZMAX=MIN(1.-XH,ZMAX) IF(Z(3-JT).LT.ZMIN.OR.Z(3-JT).GT.ZMAX) GOTO 300 KCC=22 ELSEIF(ISUB.EQ.74) THEN C...Z0 + H0 -> Z0 + H0. ELSEIF(ISUB.EQ.75) THEN C...W+ + W- -> gamma + gamma. ELSEIF(ISUB.EQ.76.OR.ISUB.EQ.77) THEN C...W+ + W- -> Z0 + Z0; W+ + W- -> W+ + W-. XH=SH/SHP 340 DO 370 JT=1,2 I=MINT(14+JT) IA=IABS(I) IF(IA.LE.10) THEN RVCKM=VINT(180+I)*RLU(0) DO 360 J=1,MSTP(1) IB=2*J-1+MOD(IA,2) IPM=(5-ISIGN(1,I))/2 IDC=J+MDCY(IA,2)+2 IF(MDME(IDC,1).NE.1.AND.MDME(IDC,1).NE.IPM) GOTO 360 MINT(20+JT)=ISIGN(IB,I) RVCKM=RVCKM-VCKM((IA+1)/2,(IB+1)/2) IF(RVCKM.LE.0.) GOTO 370 360 CONTINUE ELSE IB=2*((IA+1)/2)-1+MOD(IA,2) MINT(20+JT)=ISIGN(IB,I) ENDIF 370 PMQ(JT)=ULMASS(MINT(20+JT)) JT=INT(1.5+RLU(0)) ZMIN=2.*PMQ(JT)/SHPR ZMAX=1.-PMQ(3-JT)/SHPR-(SH-PMQ(JT)**2)/(SHPR*(SHPR-PMQ(3-JT))) ZMAX=MIN(1.-XH,ZMAX) Z(JT)=ZMIN+(ZMAX-ZMIN)*RLU(0) IF(-1.+(1.+XH)/(1.-Z(JT))-XH/(1.-Z(JT))**2.LT. & (1.-XH)**2/(4.*XH)*RLU(0)) GOTO 340 SQC1=1.-4.*PMQ(JT)**2/(Z(JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 340 C1=SQRT(SQC1) C2=1.+2.*(PMAS(24,1)**2-PMQ(JT)**2)/(Z(JT)*SHP) CTHE(JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(JT)=MIN(1.,MAX(-1.,CTHE(JT))) Z(3-JT)=1.-XH/(1.-Z(JT)) SQC1=1.-4.*PMQ(3-JT)**2/(Z(3-JT)**2*SHP) IF(SQC1.LT.1.E-8) GOTO 340 C1=SQRT(SQC1) C2=1.+2.*(PMAS(24,1)**2-PMQ(3-JT)**2)/(Z(3-JT)*SHP) CTHE(3-JT)=(C2-(C2**2-C1**2)/(C2+(2.*RLU(0)-1.)*C1))/C1 CTHE(3-JT)=MIN(1.,MAX(-1.,CTHE(3-JT))) PHIR=PARU(2)*RLU(0) CPHI=COS(PHIR) ANG=CTHE(1)*CTHE(2)-SQRT(1.-CTHE(1)**2)*SQRT(1.-CTHE(2)**2)*CPHI Z1=2.-Z(JT) Z2=ANG*SQRT(Z(JT)**2-4.*PMQ(JT)**2/SHP) Z3=1.-Z(JT)-XH+(PMQ(1)**2+PMQ(2)**2)/SHP Z(3-JT)=2./(Z1**2-Z2**2)*(Z1*Z3+Z2*SQRT(Z3**2-(Z1**2-Z2**2)* & PMQ(3-JT)**2/SHP)) ZMIN=2.*PMQ(3-JT)/SHPR ZMAX=1.-PMQ(JT)/SHPR-(SH-PMQ(3-JT)**2)/(SHPR*(SHPR-PMQ(JT))) ZMAX=MIN(1.-XH,ZMAX) IF(Z(3-JT).LT.ZMIN.OR.Z(3-JT).GT.ZMAX) GOTO 340 KCC=22 ELSEIF(ISUB.EQ.78) THEN C...W+/- + H0 -> W+/- + H0. ELSEIF(ISUB.EQ.79) THEN C...H0 + H0 -> H0 + H0. ENDIF ELSEIF(ISUB.LE.90) THEN IF(ISUB.EQ.81) THEN C...q + qb -> Q' + Qb'; th = (p(q)-p(q'))**2. MINT(21)=ISIGN(MINT(46),MINT(15)) MINT(22)=-MINT(21) KCC=4 ELSEIF(ISUB.EQ.82) THEN C...g + g -> Q + Qb; th arbitrary. KCS=(-1)**INT(1.5+RLU(0)) MINT(21)=ISIGN(MINT(46),KCS) MINT(22)=-MINT(21) KCC=MINT(2)+10 ENDIF ELSEIF(ISUB.LE.100) THEN IF(ISUB.EQ.95) THEN C...Low-pT ( = energyless g + g -> g + g). KCC=MINT(2)+12 KCS=(-1)**INT(1.5+RLU(0)) ELSEIF(ISUB.EQ.96) THEN C...Multiple interactions (should be reassigned to QCD process). ENDIF ELSEIF(ISUB.LE.110) THEN IF(ISUB.EQ.101) THEN C...g + g -> gamma*/Z0. KCC=21 KFRES=22 ELSEIF(ISUB.EQ.102) THEN C...g + g -> H0. KCC=21 KFRES=25 ENDIF ELSEIF(ISUB.LE.120) THEN IF(ISUB.EQ.111) THEN C...f + fb -> g + H0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(20+JS)=21 MINT(23-JS)=25 KCC=17+JS ELSEIF(ISUB.EQ.112) THEN C...f + g -> f + H0; th = (p(f) - p(f))**2. IF(MINT(15).EQ.21) JS=2 MINT(23-JS)=25 KCC=15+JS KCS=ISIGN(1,MINT(14+JS)) ELSEIF(ISUB.EQ.113) THEN C...g + g -> g + H0; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(23-JS)=25 KCC=22+JS KCS=(-1)**INT(1.5+RLU(0)) ELSEIF(ISUB.EQ.114) THEN C...g + g -> gamma + gamma; th arbitrary. IF(RLU(0).GT.0.5) JS=2 MINT(21)=22 MINT(22)=22 KCC=21 ELSEIF(ISUB.EQ.115) THEN C...g + g -> gamma + Z0. ELSEIF(ISUB.EQ.116) THEN C...g + g -> Z0 + Z0. ELSEIF(ISUB.EQ.117) THEN C...g + g -> W+ + W-. ENDIF ELSEIF(ISUB.LE.140) THEN IF(ISUB.EQ.121) THEN C...g + g -> f + fb + H0. ENDIF ELSEIF(ISUB.LE.160) THEN IF(ISUB.EQ.141) THEN C...f + fb -> gamma*/Z0/Z'0. KFRES=32 ELSEIF(ISUB.EQ.142) THEN C...f + fb' -> H+/-. KCH1=KCHG(IABS(MINT(15)),1)*ISIGN(1,MINT(15)) KCH2=KCHG(IABS(MINT(16)),1)*ISIGN(1,MINT(16)) KFRES=ISIGN(37,KCH1+KCH2) ELSEIF(ISUB.EQ.143) THEN C...f + fb' -> R. KFRES=ISIGN(40,MINT(15)+MINT(16)) ENDIF ELSE IF(ISUB.EQ.161) THEN C...f + g -> f' + H+/-; th = (p(f)-p(f'))**2. IF(MINT(15).EQ.21) JS=2 I=MINT(14+JS) IA=IABS(I) MINT(23-JS)=ISIGN(37,KCHG(IA,1)*I) IB=IA+MOD(IA,2)-MOD(IA+1,2) MINT(20+JS)=ISIGN(IB,I) KCC=15+JS KCS =ISIGN(1,MINT(14+JS)) ENDIF ENDIF IF(IDOC.EQ.7) THEN C...Resonance not decaying: store colour connection indices. I=MINT(83)+7 K(IPU3,1)=1 K(IPU3,2)=KFRES K(IPU3,3)=I P(IPU3,4)=SHUSER P(IPU3,5)=SHUSER K(IPU1,4)=IPU2 K(IPU1,5)=IPU2 K(IPU2,4)=IPU1 K(IPU2,5)=IPU1 K(I,1)=21 K(I,2)=KFRES P(I,4)=SHUSER P(I,5)=SHUSER N=IPU3 MINT(21)=KFRES MINT(22)=0 ELSEIF(IDOC.EQ.8) THEN C...2 -> 2 processes: store outgoing partons in their CM-frame. DO 390 JT=1,2 I=MINT(84)+2+JT K(I,1)=1 IF(IABS(MINT(20+JT)).LE.10.OR.MINT(20+JT).EQ.21) K(I,1)=3 K(I,2)=MINT(20+JT) K(I,3)=MINT(83)+IDOC+JT-2 IF(IABS(K(I,2)).LE.10.OR.K(I,2).EQ.21) THEN P(I,5)=ULMASS(K(I,2)) ELSE P(I,5)=SQRT(VINT(63+MOD(JS+JT,2))) ENDIF 390 CONTINUE IF(P(IPU3,5)+P(IPU4,5).GE.SHR) THEN KFA1=IABS(MINT(21)) KFA2=IABS(MINT(22)) IF((KFA1.GT.3.AND.KFA1.NE.21).OR.(KFA2.GT.3.AND.KFA2.NE.21)) & THEN MINT(51)=1 RETURN ENDIF P(IPU3,5)=0. P(IPU4,5)=0. ENDIF P(IPU3,4)=0.5*(SHR+(P(IPU3,5)**2-P(IPU4,5)**2)/SHR) P(IPU3,3)=SQRT(MAX(0.,P(IPU3,4)**2-P(IPU3,5)**2)) P(IPU4,4)=SHR-P(IPU3,4) P(IPU4,3)=-P(IPU3,3) N=IPU4 MINT(7)=MINT(83)+7 MINT(8)=MINT(83)+8 C...Rotate outgoing partons using cos(theta)=(th-uh)/lam(sh,sqm3,sqm4). CALL LUDBRB(IPU3,IPU4,ACOS(VINT(23)),VINT(24),0D0,0D0,0D0) ELSEIF(IDOC.EQ.9) THEN C'''2 -> 3 processes: ELSEIF(IDOC.EQ.11) THEN C...Z0 + Z0 -> H0, W+ + W- -> H0: store Higgs and outgoing partons. PHI(1)=PARU(2)*RLU(0) PHI(2)=PHI(1)-PHIR DO 400 JT=1,2 I=MINT(84)+2+JT K(I,1)=1 IF(IABS(MINT(20+JT)).LE.10.OR.MINT(20+JT).EQ.21) K(I,1)=3 K(I,2)=MINT(20+JT) K(I,3)=MINT(83)+IDOC+JT-2 P(I,5)=ULMASS(K(I,2)) IF(0.5*SHPR*Z(JT).LE.P(I,5)) P(I,5)=0. PABS=SQRT(MAX(0.,(0.5*SHPR*Z(JT))**2-P(I,5)**2)) PTABS=PABS*SQRT(MAX(0.,1.-CTHE(JT)**2)) P(I,1)=PTABS*COS(PHI(JT)) P(I,2)=PTABS*SIN(PHI(JT)) P(I,3)=PABS*CTHE(JT)*(-1)**(JT+1) P(I,4)=0.5*SHPR*Z(JT) IZW=MINT(83)+6+JT K(IZW,1)=21 K(IZW,2)=23 IF(ISUB.EQ.8) K(IZW,2)=ISIGN(24,LUCHGE(MINT(14+JT))) K(IZW,3)=IZW-2 P(IZW,1)=-P(I,1) P(IZW,2)=-P(I,2) P(IZW,3)=(0.5*SHPR-PABS*CTHE(JT))*(-1)**(JT+1) P(IZW,4)=0.5*SHPR*(1.-Z(JT)) 400 P(IZW,5)=-SQRT(MAX(0.,P(IZW,3)**2+PTABS**2-P(IZW,4)**2)) I=MINT(83)+9 K(IPU5,1)=1 K(IPU5,2)=KFRES K(IPU5,3)=I P(IPU5,5)=SHR P(IPU5,1)=-P(IPU3,1)-P(IPU4,1) P(IPU5,2)=-P(IPU3,2)-P(IPU4,2) P(IPU5,3)=-P(IPU3,3)-P(IPU4,3) P(IPU5,4)=SHPR-P(IPU3,4)-P(IPU4,4) K(I,1)=21 K(I,2)=KFRES DO 410 J=1,5 410 P(I,J)=P(IPU5,J) N=IPU5 MINT(23)=KFRES ELSEIF(IDOC.EQ.12) THEN C...Z0 and W+/- scattering: store bosons and outgoing partons. PHI(1)=PARU(2)*RLU(0) PHI(2)=PHI(1)-PHIR DO 420 JT=1,2 I=MINT(84)+2+JT K(I,1)=1 IF(IABS(MINT(20+JT)).LE.10.OR.MINT(20+JT).EQ.21) K(I,1)=3 K(I,2)=MINT(20+JT) K(I,3)=MINT(83)+IDOC+JT-2 P(I,5)=ULMASS(K(I,2)) IF(0.5*SHPR*Z(JT).LE.P(I,5)) P(I,5)=0. PABS=SQRT(MAX(0.,(0.5*SHPR*Z(JT))**2-P(I,5)**2)) PTABS=PABS*SQRT(MAX(0.,1.-CTHE(JT)**2)) P(I,1)=PTABS*COS(PHI(JT)) P(I,2)=PTABS*SIN(PHI(JT)) P(I,3)=PABS*CTHE(JT)*(-1)**(JT+1) P(I,4)=0.5*SHPR*Z(JT) IZW=MINT(83)+6+JT K(IZW,1)=21 IF(MINT(14+JT).EQ.MINT(20+JT)) THEN K(IZW,2)=23 ELSE K(IZW,2)=ISIGN(24,LUCHGE(MINT(14+JT))-LUCHGE(MINT(20+JT))) ENDIF K(IZW,3)=IZW-2 P(IZW,1)=-P(I,1) P(IZW,2)=-P(I,2) P(IZW,3)=(0.5*SHPR-PABS*CTHE(JT))*(-1)**(JT+1) P(IZW,4)=0.5*SHPR*(1.-Z(JT)) P(IZW,5)=-SQRT(MAX(0.,P(IZW,3)**2+PTABS**2-P(IZW,4)**2)) IPU=MINT(84)+4+JT K(IPU,1)=3 K(IPU,2)=KFPR(ISUB,JT) K(IPU,3)=MINT(83)+8+JT IF(IABS(K(IPU,2)).LE.10.OR.K(IPU,2).EQ.21) THEN P(IPU,5)=ULMASS(K(IPU,2)) ELSE P(IPU,5)=SQRT(VINT(63+MOD(JS+JT,2))) ENDIF MINT(22+JT)=K(IZW,2) 420 CONTINUE IF(ISUB.EQ.72) K(MINT(84)+4+INT(1.5+RLU(0)),2)=-24 C...Find rotation and boost for hard scattering subsystem. I1=MINT(83)+7 I2=MINT(83)+8 BEXCM=(P(I1,1)+P(I2,1))/(P(I1,4)+P(I2,4)) BEYCM=(P(I1,2)+P(I2,2))/(P(I1,4)+P(I2,4)) BEZCM=(P(I1,3)+P(I2,3))/(P(I1,4)+P(I2,4)) GAMCM=(P(I1,4)+P(I2,4))/SHR BEPCM=BEXCM*P(I1,1)+BEYCM*P(I1,2)+BEZCM*P(I1,3) PX=P(I1,1)+GAMCM*(GAMCM/(1.+GAMCM)*BEPCM-P(I1,4))*BEXCM PY=P(I1,2)+GAMCM*(GAMCM/(1.+GAMCM)*BEPCM-P(I1,4))*BEYCM PZ=P(I1,3)+GAMCM*(GAMCM/(1.+GAMCM)*BEPCM-P(I1,4))*BEZCM THECM=ULANGL(PZ,SQRT(PX**2+PY**2)) PHICM=ULANGL(PX,PY) C...Store hard scattering subsystem. Rotate and boost it. SQLAM=(SH-P(IPU5,5)**2-P(IPU6,5)**2)**2-4.*P(IPU5,5)**2* & P(IPU6,5)**2 PABS=SQRT(MAX(0.,SQLAM/(4.*SH))) CTHWZ=VINT(23) STHWZ=SQRT(MAX(0.,1.-CTHWZ**2)) PHIWZ=VINT(24)-PHICM P(IPU5,1)=PABS*STHWZ*COS(PHIWZ) P(IPU5,2)=PABS*STHWZ*SIN(PHIWZ) P(IPU5,3)=PABS*CTHWZ P(IPU5,4)=SQRT(PABS**2+P(IPU5,5)**2) P(IPU6,1)=-P(IPU5,1) P(IPU6,2)=-P(IPU5,2) P(IPU6,3)=-P(IPU5,3) P(IPU6,4)=SQRT(PABS**2+P(IPU6,5)**2) CALL LUDBRB(IPU5,IPU6,THECM,PHICM,DBLE(BEXCM),DBLE(BEYCM), & DBLE(BEZCM)) DO 430 JT=1,2 I1=MINT(83)+8+JT I2=MINT(84)+4+JT K(I1,1)=21 K(I1,2)=K(I2,2) DO 430 J=1,5 430 P(I1,J)=P(I2,J) N=IPU6 MINT(7)=MINT(83)+9 MINT(8)=MINT(83)+10 ENDIF IF(IDOC.GE.8) THEN C...Store colour connection indices. DO 440 J=1,2 JC=J IF(KCS.EQ.-1) JC=3-J IF(ICOL(KCC,1,JC).NE.0.AND.K(IPU1,1).EQ.14) K(IPU1,J+3)= & K(IPU1,J+3)+MINT(84)+ICOL(KCC,1,JC) IF(ICOL(KCC,2,JC).NE.0.AND.K(IPU2,1).EQ.14) K(IPU2,J+3)= & K(IPU2,J+3)+MINT(84)+ICOL(KCC,2,JC) IF(ICOL(KCC,3,JC).NE.0.AND.K(IPU3,1).EQ.3) K(IPU3,J+3)= & MSTU(5)*(MINT(84)+ICOL(KCC,3,JC)) 440 IF(ICOL(KCC,4,JC).NE.0.AND.K(IPU4,1).EQ.3) K(IPU4,J+3)= & MSTU(5)*(MINT(84)+ICOL(KCC,4,JC)) C...Copy outgoing partons to documentation lines. DO 450 I=1,2 I1=MINT(83)+IDOC-2+I I2=MINT(84)+2+I K(I1,1)=21 K(I1,2)=K(I2,2) IF(IDOC.LE.9) K(I1,3)=0 IF(IDOC.GE.11) K(I1,3)=MINT(83)+2+I DO 450 J=1,5 450 P(I1,J)=P(I2,J) ENDIF MINT(52)=N C...Low-pT events: remove gluons used for string drawing purposes. IF(ISUB.EQ.95) THEN K(IPU3,1)=K(IPU3,1)+10 K(IPU4,1)=K(IPU4,1)+10 DO 460 J=41,66 460 VINT(J)=0. DO 470 I=MINT(83)+5,MINT(83)+8 DO 470 J=1,5 470 P(I,J)=0. ENDIF RETURN END C********************************************************************* SUBROUTINE PYSSPA(IPU1,IPU2) C...Generates spacelike parton showers. IMPLICIT DOUBLE PRECISION(D) COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/ DIMENSION KFLS(4),IS(2),XS(2),ZS(2),Q2S(2),TEVS(2),ROBO(5), &XFS(2,-6:6),XFA(-6:6),XFB(-6:6),XFN(-6:6),WTAP(-6:6),WTSF(-6:6), &THE2(2),ALAM(2),DQ2(3),DPC(3),DPD(4),DPB(4) C...Calculate maximum virtuality and check that evolution possible. IPUS1=IPU1 IPUS2=IPU2 ISUB=MINT(1) Q2E=VINT(52) IF(ISET(ISUB).EQ.1) THEN Q2E=Q2E/PARP(67) ELSEIF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) THEN Q2E=PMAS(23,1)**2 IF(ISUB.EQ.8.OR.ISUB.EQ.76.OR.ISUB.EQ.77) Q2E=PMAS(24,1)**2 ENDIF TMAX=LOG(PARP(67)*PARP(63)*Q2E/PARP(61)**2) IF(PARP(67)*Q2E.LT.MAX(PARP(62)**2,2.*PARP(61)**2).OR. &TMAX.LT.0.2) RETURN C...Common constants and initial values. Save normal Lambda value. XE0=2.*PARP(65)/VINT(1) ALAMS=PARU(111) PARU(111)=PARP(61) NS=N 100 N=NS DO 110 JT=1,2 KFLS(JT)=MINT(14+JT) KFLS(JT+2)=KFLS(JT) XS(JT)=VINT(40+JT) ZS(JT)=1. Q2S(JT)=PARP(67)*Q2E TEVS(JT)=TMAX ALAM(JT)=PARP(61) THE2(JT)=100. DO 110 KFL=-6,6 110 XFS(JT,KFL)=XSFX(JT,KFL) DSH=VINT(44) IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) DSH=VINT(26)*VINT(2) C...Pick up leg with highest virtuality. 120 N=N+1 JT=1 IF(N.GT.NS+1.AND.Q2S(2).GT.Q2S(1)) JT=2 KFLB=KFLS(JT) XB=XS(JT) DO 130 KFL=-6,6 130 XFB(KFL)=XFS(JT,KFL) DSHR=2D0*SQRT(DSH) DSHZ=DSH/DBLE(ZS(JT)) XE=MAX(XE0,XB*(1./(1.-PARP(66))-1.)) IF(XB+XE.GE.0.999) THEN Q2B=0. GOTO 220 ENDIF C...Maximum Q2 without or with Q2 ordering. Effective Lambda and n_f. IF(MSTP(62).LE.1) THEN Q2B=0.5*(1./ZS(JT)+1.)*Q2S(JT)+0.5*(1./ZS(JT)-1.)*(Q2S(3-JT)- & SNGL(DSH)+SQRT((SNGL(DSH)+Q2S(1)+Q2S(2))**2+8.*Q2S(1)*Q2S(2)* & ZS(JT)/(1.-ZS(JT)))) TEVB=LOG(PARP(63)*Q2B/ALAM(JT)**2) ELSE Q2B=Q2S(JT) TEVB=TEVS(JT) ENDIF ALSDUM=ULALPS(PARP(63)*Q2B) TEVB=TEVB+2.*LOG(ALAM(JT)/PARU(117)) TEVBSV=TEVB ALAM(JT)=PARU(117) B0=(33.-2.*MSTU(118))/6. C...Calculate Altarelli-Parisi and structure function weights. DO 140 KFL=-6,6 WTAP(KFL)=0. 140 WTSF(KFL)=0. IF(KFLB.EQ.21) THEN WTAPQ=16.*(1.-SQRT(XB+XE))/(3.*SQRT(XB)) DO 150 KFL=-MSTP(54),MSTP(54) IF(KFL.EQ.0) WTAP(KFL)=6.*LOG((1.-XB)/XE) 150 IF(KFL.NE.0) WTAP(KFL)=WTAPQ ELSE WTAP(0)=0.5*XB*(1./(XB+XE)-1.) WTAP(KFLB)=8.*LOG((1.-XB)*(XB+XE)/XE)/3. ENDIF 160 WTSUM=0. IF(KFLB.NE.21) XFBO=XFB(KFLB) IF(KFLB.EQ.21) XFBO=XFB(0) DO 170 KFL=-MSTP(54),MSTP(54) WTSF(KFL)=XFB(KFL)/XFBO 170 WTSUM=WTSUM+WTAP(KFL)*WTSF(KFL) WTSUM=MAX(0.0001,WTSUM) C...Choose new t: fix alpha_s, alpha_s(Q^2), alpha_s(k_T^2). 180 IF(MSTP(64).LE.0) THEN TEVB=TEVB+LOG(RLU(0))*PARU(2)/(PARU(111)*WTSUM) ELSEIF(MSTP(64).EQ.1) THEN TEVB=TEVB*EXP(MAX(-100.,LOG(RLU(0))*B0/WTSUM)) ELSE TEVB=TEVB*EXP(MAX(-100.,LOG(RLU(0))*B0/(5.*WTSUM))) ENDIF 190 Q2REF=ALAM(JT)**2*EXP(TEVB) Q2B=Q2REF/PARP(63) C...Evolution ended or select flavour for branching parton. IF(Q2B.LT.PARP(62)**2) THEN Q2B=0. ELSE WTRAN=RLU(0)*WTSUM KFLA=-MSTP(54)-1 200 KFLA=KFLA+1 WTRAN=WTRAN-WTAP(KFLA)*WTSF(KFLA) IF(KFLA.LT.MSTP(54).AND.WTRAN.GT.0.) GOTO 200 IF(KFLA.EQ.0) KFLA=21 C...Choose z value and corrective weight. IF(KFLB.EQ.21.AND.KFLA.EQ.21) THEN Z=1./(1.+((1.-XB)/XB)*(XE/(1.-XB))**RLU(0)) WTZ=(1.-Z*(1.-Z))**2 ELSEIF(KFLB.EQ.21) THEN Z=XB/(1.-RLU(0)*(1.-SQRT(XB+XE)))**2 WTZ=0.5*(1.+(1.-Z)**2)*SQRT(Z) ELSEIF(KFLA.EQ.21) THEN Z=XB*(1.+RLU(0)*(1./(XB+XE)-1.)) WTZ=1.-2.*Z*(1.-Z) ELSE Z=1.-(1.-XB)*(XE/((XB+XE)*(1.-XB)))**RLU(0) WTZ=0.5*(1.+Z**2) ENDIF C...Option with resummation of soft gluon emission as effective z shift. IF(MSTP(65).GE.1) THEN RSOFT=6. IF(KFLB.NE.21) RSOFT=8./3. Z=Z*(TEVB/TEVS(JT))**(RSOFT*XE/((XB+XE)*B0)) IF(Z.LE.XB) GOTO 180 ENDIF C...Option with alpha_s(k_T^2)Q^2): demand k_T^2 > cutoff, reweight. IF(MSTP(64).GE.2) THEN IF((1.-Z)*Q2B.LT.PARP(62)**2) GOTO 180 ALPRAT=TEVB/(TEVB+LOG(1.-Z)) IF(ALPRAT.LT.5.*RLU(0)) GOTO 180 IF(ALPRAT.GT.5.) WTZ=WTZ*ALPRAT/5. ENDIF C...Option with angular ordering requirement. IF(MSTP(62).GE.3) THEN THE2T=(4.*Z**2*Q2B)/(VINT(2)*(1.-Z)*XB**2) IF(THE2T.GT.THE2(JT)) GOTO 180 ENDIF C...Weighting with new structure functions. CALL PYSTFU(MINT(10+JT),XB,Q2REF,XFN) IF(KFLB.NE.21) XFBN=XFN(KFLB) IF(KFLB.EQ.21) XFBN=XFN(0) IF(XFBN.LT.1E-20) THEN IF(KFLA.EQ.KFLB) THEN TEVB=TEVBSV WTAP(KFLB)=0. GOTO 160 ELSEIF(TEVBSV-TEVB.GT.0.2) THEN TEVB=0.5*(TEVBSV+TEVB) GOTO 190 ELSE XFBN=1E-10 IF(KFLB.NE.21) XFN(KFLB)=XFBN IF(KFLB.EQ.21) XFN(0)=XFBN ENDIF ENDIF DO 210 KFL=-MSTP(54),MSTP(54) 210 XFB(KFL)=XFN(KFL) XA=XB/Z CALL PYSTFU(MINT(10+JT),XA,Q2REF,XFA) IF(KFLA.NE.21) XFAN=XFA(KFLA) IF(KFLA.EQ.21) XFAN=XFA(0) IF(XFAN.LT.1E-20) GOTO 160 IF(KFLA.NE.21) WTSFA=WTSF(KFLA) IF(KFLA.EQ.21) WTSFA=WTSF(0) IF(WTZ*XFAN/XFBN.LT.RLU(0)*WTSFA) GOTO 160 ENDIF C...Define two hard scatterers in their CM-frame. 220 IF(N.EQ.NS+2) THEN DQ2(JT)=Q2B DPLCM=SQRT((DSH+DQ2(1)+DQ2(2))**2-4D0*DQ2(1)*DQ2(2))/DSHR DO 240 JR=1,2 I=NS+JR IF(JR.EQ.1) IPO=IPUS1 IF(JR.EQ.2) IPO=IPUS2 DO 230 J=1,5 K(I,J)=0 P(I,J)=0. 230 V(I,J)=0. K(I,1)=14 K(I,2)=KFLS(JR+2) K(I,4)=IPO K(I,5)=IPO P(I,3)=DPLCM*(-1)**(JR+1) P(I,4)=(DSH+DQ2(3-JR)-DQ2(JR))/DSHR P(I,5)=-SQRT(SNGL(DQ2(JR))) K(IPO,1)=14 K(IPO,3)=I K(IPO,4)=MOD(K(IPO,4),MSTU(5))+MSTU(5)*I 240 K(IPO,5)=MOD(K(IPO,5),MSTU(5))+MSTU(5)*I C...Find maximum allowed mass of timelike parton. ELSEIF(N.GT.NS+2) THEN JR=3-JT DQ2(3)=Q2B DPC(1)=P(IS(1),4) DPC(2)=P(IS(2),4) DPC(3)=0.5*(ABS(P(IS(1),3))+ABS(P(IS(2),3))) DPD(1)=DSH+DQ2(JR)+DQ2(JT) DPD(2)=DSHZ+DQ2(JR)+DQ2(3) DPD(3)=SQRT(DPD(1)**2-4D0*DQ2(JR)*DQ2(JT)) DPD(4)=SQRT(DPD(2)**2-4D0*DQ2(JR)*DQ2(3)) IKIN=0 IF(Q2S(JR).GE.(0.5*PARP(62))**2.AND.DPD(1)-DPD(3).GE. & 1D-10*DPD(1)) IKIN=1 IF(IKIN.EQ.0) DMSMA=(DQ2(JT)/DBLE(ZS(JT))-DQ2(3))*(DSH/ & (DSH+DQ2(JT))-DSH/(DSHZ+DQ2(3))) IF(IKIN.EQ.1) DMSMA=(DPD(1)*DPD(2)-DPD(3)*DPD(4))/(2.* & DQ2(JR))-DQ2(JT)-DQ2(3) C...Generate timelike parton shower (if required). IT=N DO 250 J=1,5 K(IT,J)=0 P(IT,J)=0. 250 V(IT,J)=0. K(IT,1)=3 K(IT,2)=21 IF(KFLB.EQ.21.AND.KFLS(JT+2).NE.21) K(IT,2)=-KFLS(JT+2) IF(KFLB.NE.21.AND.KFLS(JT+2).EQ.21) K(IT,2)=KFLB P(IT,5)=ULMASS(K(IT,2)) IF(SNGL(DMSMA).LE.P(IT,5)**2) GOTO 100 IF(MSTP(63).GE.1) THEN P(IT,4)=(DSHZ-DSH-P(IT,5)**2)/DSHR P(IT,3)=SQRT(P(IT,4)**2-P(IT,5)**2) IF(MSTP(63).EQ.1) THEN Q2TIM=DMSMA ELSEIF(MSTP(63).EQ.2) THEN Q2TIM=MIN(SNGL(DMSMA),PARP(71)*Q2S(JT)) ELSE C'''Here remains to introduce angular ordering in first branching. Q2TIM=DMSMA ENDIF CALL LUSHOW(IT,0,SQRT(Q2TIM)) IF(N.GE.IT+1) P(IT,5)=P(IT+1,5) ENDIF C...Reconstruct kinematics of branching: timelike parton shower. DMS=P(IT,5)**2 IF(IKIN.EQ.0) DPT2=(DMSMA-DMS)*(DSHZ+DQ2(3))/(DSH+DQ2(JT)) IF(IKIN.EQ.1) DPT2=(DMSMA-DMS)*(0.5*DPD(1)*DPD(2)+0.5*DPD(3)* & DPD(4)-DQ2(JR)*(DQ2(JT)+DQ2(3)+DMS))/(4.*DSH*DPC(3)**2) IF(DPT2.LT.0.) GOTO 100 DPB(1)=(0.5*DPD(2)-DPC(JR)*(DSHZ+DQ2(JR)-DQ2(JT)-DMS)/ & DSHR)/DPC(3)-DPC(3) P(IT,1)=SQRT(SNGL(DPT2)) P(IT,3)=DPB(1)*(-1)**(JT+1) P(IT,4)=(DSHZ-DSH-DMS)/DSHR IF(N.GE.IT+1) THEN DPB(1)=SQRT(DPB(1)**2+DPT2) DPB(2)=SQRT(DPB(1)**2+DMS) DPB(3)=P(IT+1,3) DPB(4)=SQRT(DPB(3)**2+DMS) DBEZ=(DPB(4)*DPB(1)-DPB(3)*DPB(2))/(DPB(4)*DPB(2)-DPB(3)* & DPB(1)) CALL LUDBRB(IT+1,N,0.,0.,0D0,0D0,DBEZ) THE=ULANGL(P(IT,3),P(IT,1)) CALL LUDBRB(IT+1,N,THE,0.,0D0,0D0,0D0) ENDIF C...Reconstruct kinematics of branching: spacelike parton. DO 260 J=1,5 K(N+1,J)=0 P(N+1,J)=0. 260 V(N+1,J)=0. K(N+1,1)=14 K(N+1,2)=KFLB P(N+1,1)=P(IT,1) P(N+1,3)=P(IT,3)+P(IS(JT),3) P(N+1,4)=P(IT,4)+P(IS(JT),4) P(N+1,5)=-SQRT(SNGL(DQ2(3))) C...Define colour flow of branching. K(IS(JT),3)=N+1 K(IT,3)=N+1 ID1=IT IF((K(N+1,2).GT.0.AND.K(N+1,2).NE.21.AND.K(ID1,2).GT.0.AND. & K(ID1,2).NE.21).OR.(K(N+1,2).LT.0.AND.K(ID1,2).EQ.21).OR. & (K(N+1,2).EQ.21.AND.K(ID1,2).EQ.21.AND.RLU(0).GT.0.5).OR. & (K(N+1,2).EQ.21.AND.K(ID1,2).LT.0)) ID1=IS(JT) ID2=IT+IS(JT)-ID1 K(N+1,4)=K(N+1,4)+ID1 K(N+1,5)=K(N+1,5)+ID2 K(ID1,4)=K(ID1,4)+MSTU(5)*(N+1) K(ID1,5)=K(ID1,5)+MSTU(5)*ID2 K(ID2,4)=K(ID2,4)+MSTU(5)*ID1 K(ID2,5)=K(ID2,5)+MSTU(5)*(N+1) N=N+1 C...Boost to new CM-frame. CALL LUDBRB(NS+1,N,0.,0.,-DBLE((P(N,1)+P(IS(JR),1))/(P(N,4)+ & P(IS(JR),4))),0D0,-DBLE((P(N,3)+P(IS(JR),3))/(P(N,4)+ & P(IS(JR),4)))) IR=N+(JT-1)*(IS(1)-N) CALL LUDBRB(NS+1,N,-ULANGL(P(IR,3),P(IR,1)),PARU(2)*RLU(0), & 0D0,0D0,0D0) ENDIF C...Save quantities, loop back. IS(JT)=N Q2S(JT)=Q2B DQ2(JT)=Q2B IF(MSTP(62).GE.3) THE2(JT)=THE2T DSH=DSHZ IF(Q2B.GE.(0.5*PARP(62))**2) THEN KFLS(JT+2)=KFLS(JT) KFLS(JT)=KFLA XS(JT)=XA ZS(JT)=Z DO 270 KFL=-6,6 270 XFS(JT,KFL)=XFA(KFL) TEVS(JT)=TEVB ELSE IF(JT.EQ.1) IPU1=N IF(JT.EQ.2) IPU2=N ENDIF IF(N.GT.MSTU(4)-MSTU(32)-10) THEN CALL LUERRM(11,'(PYSSPA:) no more memory left in LUJETS') IF(MSTU(21).GE.1) N=NS IF(MSTU(21).GE.1) RETURN ENDIF IF(MAX(Q2S(1),Q2S(2)).GE.(0.5*PARP(62))**2.OR.N.LE.NS+1) GOTO 120 C...Boost hard scattering partons to frame of shower initiators. DO 280 J=1,3 280 ROBO(J+2)=(P(NS+1,J)+P(NS+2,J))/(P(NS+1,4)+P(NS+2,4)) K(N+2,1)=1 DO 290 J=1,5 290 P(N+2,J)=P(NS+1,J) ROBOT=ROBO(3)**2+ROBO(4)**2+ROBO(5)**2 IF(ROBOT.GE.0.999999) THEN ROBOT=1.00001*SQRT(ROBOT) ROBO(3)=ROBO(3)/ROBOT ROBO(4)=ROBO(4)/ROBOT ROBO(5)=ROBO(5)/ROBOT ENDIF CALL LUDBRB(N+2,N+2,0.,0.,-DBLE(ROBO(3)),-DBLE(ROBO(4)), &-DBLE(ROBO(5))) ROBO(2)=ULANGL(P(N+2,1),P(N+2,2)) ROBO(1)=ULANGL(P(N+2,3),SQRT(P(N+2,1)**2+P(N+2,2)**2)) CALL LUDBRB(MINT(83)+5,NS,ROBO(1),ROBO(2),DBLE(ROBO(3)), &DBLE(ROBO(4)),DBLE(ROBO(5))) C...Store user information. Reset Lambda value. K(IPU1,3)=MINT(83)+3 K(IPU2,3)=MINT(83)+4 DO 300 JT=1,2 MINT(12+JT)=KFLS(JT) 300 VINT(140+JT)=XS(JT) PARU(111)=ALAMS RETURN END C********************************************************************* SUBROUTINE PYMULT(MMUL) C...Initializes treatment of multiple interactions, selects kinematics C...of hardest interaction if low-pT physics included in run, and C...generates all non-hardest interactions. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT5/ DIMENSION NMUL(20),SIGM(20),KSTR(500,2),VINTSV(80) SAVE XT2,XT2FAC,XC2,XTS,IRBIN,RBIN,NMUL,SIGM C...Initialization of multiple interaction treatment. IF(MMUL.EQ.1) THEN IF(MSTP(122).GE.1) WRITE(MSTU(11),1000) MSTP(82) ISUB=96 MINT(1)=96 VINT(63)=0. VINT(64)=0. VINT(143)=1. VINT(144)=1. C...Loop over phase space points: xT2 choice in 20 bins. 100 SIGSUM=0. DO 120 IXT2=1,20 NMUL(IXT2)=MSTP(83) SIGM(IXT2)=0. DO 110 ITRY=1,MSTP(83) RSCA=0.05*((21-IXT2)-RLU(0)) XT2=VINT(149)*(1.+VINT(149))/(VINT(149)+RSCA)-VINT(149) XT2=MAX(0.01*VINT(149),XT2) VINT(25)=XT2 C...Choose tau and y*. Calculate cos(theta-hat). IF(RLU(0).LE.COEF(ISUB,1)) THEN TAUP=(2.*(1.+SQRT(1.-XT2))/XT2-1.)**RLU(0) TAU=XT2*(1.+TAUP)**2/(4.*TAUP) ELSE TAU=XT2*(1.+TAN(RLU(0)*ATAN(SQRT(1./XT2-1.)))**2) ENDIF VINT(21)=TAU CALL PYKLIM(2) RYST=RLU(0) MYST=1 IF(RYST.GT.COEF(ISUB,7)) MYST=2 IF(RYST.GT.COEF(ISUB,7)+COEF(ISUB,8)) MYST=3 CALL PYKMAP(2,MYST,RLU(0)) VINT(23)=SQRT(MAX(0.,1.-XT2/TAU))*(-1)**INT(1.5+RLU(0)) C...Calculate differential cross-section. VINT(71)=0.5*VINT(1)*SQRT(XT2) CALL PYSIGH(NCHN,SIGS) 110 SIGM(IXT2)=SIGM(IXT2)+SIGS 120 SIGSUM=SIGSUM+SIGM(IXT2) SIGSUM=SIGSUM/(20.*MSTP(83)) C...Reject result if sigma(parton-parton) is smaller than hadronic one. IF(SIGSUM.LT.1.1*VINT(106)) THEN IF(MSTP(122).GE.1) WRITE(MSTU(11),1100) PARP(82),SIGSUM PARP(82)=0.9*PARP(82) VINT(149)=4.*PARP(82)**2/VINT(2) GOTO 100 ENDIF IF(MSTP(122).GE.1) WRITE(MSTU(11),1200) PARP(82), SIGSUM C...Start iteration to find k factor. YKE=SIGSUM/VINT(106) SO=0.5 XI=0. YI=0. XK=0.5 IIT=0 130 IF(IIT.EQ.0) THEN XK=2.*XK ELSEIF(IIT.EQ.1) THEN XK=0.5*XK ELSE XK=XI+(YKE-YI)*(XF-XI)/(YF-YI) ENDIF C...Evaluate overlap integrals. IF(MSTP(82).EQ.2) THEN SP=0.5*PARU(1)*(1.-EXP(-XK)) SOP=SP/PARU(1) ELSE IF(MSTP(82).EQ.3) DELTAB=0.02 IF(MSTP(82).EQ.4) DELTAB=MIN(0.01,0.05*PARP(84)) SP=0. SOP=0. B=-0.5*DELTAB 140 B=B+DELTAB IF(MSTP(82).EQ.3) THEN OV=EXP(-B**2)/PARU(2) ELSE CQ2=PARP(84)**2 OV=((1.-PARP(83))**2*EXP(-MIN(100.,B**2))+2.*PARP(83)* & (1.-PARP(83))*2./(1.+CQ2)*EXP(-MIN(100.,B**2*2./(1.+CQ2)))+ & PARP(83)**2/CQ2*EXP(-MIN(100.,B**2/CQ2)))/PARU(2) ENDIF PACC=1.-EXP(-MIN(100.,PARU(1)*XK*OV)) SP=SP+PARU(2)*B*DELTAB*PACC SOP=SOP+PARU(2)*B*DELTAB*OV*PACC IF(B.LT.1..OR.B*PACC.GT.1E-6) GOTO 140 ENDIF YK=PARU(1)*XK*SO/SP C...Continue iteration until convergence. IF(YK.LT.YKE) THEN XI=XK YI=YK IF(IIT.EQ.1) IIT=2 ELSE XF=XK YF=YK IF(IIT.EQ.0) IIT=1 ENDIF IF(ABS(YK-YKE).GE.1E-5*YKE) GOTO 130 C...Store some results for subsequent use. VINT(145)=SIGSUM VINT(146)=SOP/SO VINT(147)=SOP/SP C...Initialize iteration in xT2 for hardest interaction. ELSEIF(MMUL.EQ.2) THEN IF(MSTP(82).LE.0) THEN ELSEIF(MSTP(82).EQ.1) THEN XT2=1. XT2FAC=XSEC(96,1)/VINT(106)*VINT(149)/(1.-VINT(149)) ELSEIF(MSTP(82).EQ.2) THEN XT2=1. XT2FAC=VINT(146)*XSEC(96,1)/VINT(106)*VINT(149)*(1.+VINT(149)) ELSE XC2=4.*CKIN(3)**2/VINT(2) IF(CKIN(3).LE.CKIN(5).OR.MINT(82).GE.2) XC2=0. ENDIF ELSEIF(MMUL.EQ.3) THEN C...Low-pT or multiple interactions (first semihard interaction): C...choose xT2 according to dpT2/pT2**2*exp(-(sigma above pT2)/norm) C...or (MSTP(82)>=2) dpT2/(pT2+pT0**2)**2*exp(-....). ISUB=MINT(1) IF(MSTP(82).LE.0) THEN XT2=0. ELSEIF(MSTP(82).EQ.1) THEN XT2=XT2FAC*XT2/(XT2FAC-XT2*LOG(RLU(0))) ELSEIF(MSTP(82).EQ.2) THEN IF(XT2.LT.1..AND.EXP(-XT2FAC*XT2/(VINT(149)*(XT2+ & VINT(149)))).GT.RLU(0)) XT2=1. IF(XT2.GE.1.) THEN XT2=(1.+VINT(149))*XT2FAC/(XT2FAC-(1.+VINT(149))*LOG(1.- & RLU(0)*(1.-EXP(-XT2FAC/(VINT(149)*(1.+VINT(149)))))))- & VINT(149) ELSE XT2=-XT2FAC/LOG(EXP(-XT2FAC/(XT2+VINT(149)))+RLU(0)* & (EXP(-XT2FAC/VINT(149))-EXP(-XT2FAC/(XT2+VINT(149)))))- & VINT(149) ENDIF XT2=MAX(0.01*VINT(149),XT2) ELSE XT2=(XC2+VINT(149))*(1.+VINT(149))/(1.+VINT(149)- & RLU(0)*(1.-XC2))-VINT(149) XT2=MAX(0.01*VINT(149),XT2) ENDIF VINT(25)=XT2 C...Low-pT: choose xT2, tau, y* and cos(theta-hat) fixed. IF(MSTP(82).LE.1.AND.XT2.LT.VINT(149)) THEN IF(MINT(82).EQ.1) NGEN(0,1)=NGEN(0,1)-1 IF(MINT(82).EQ.1) NGEN(ISUB,1)=NGEN(ISUB,1)-1 ISUB=95 MINT(1)=ISUB VINT(21)=0.01*VINT(149) VINT(22)=0. VINT(23)=0. VINT(25)=0.01*VINT(149) ELSE C...Multiple interactions (first semihard interaction). C...Choose tau and y*. Calculate cos(theta-hat). IF(RLU(0).LE.COEF(ISUB,1)) THEN TAUP=(2.*(1.+SQRT(1.-XT2))/XT2-1.)**RLU(0) TAU=XT2*(1.+TAUP)**2/(4.*TAUP) ELSE TAU=XT2*(1.+TAN(RLU(0)*ATAN(SQRT(1./XT2-1.)))**2) ENDIF VINT(21)=TAU CALL PYKLIM(2) RYST=RLU(0) MYST=1 IF(RYST.GT.COEF(ISUB,7)) MYST=2 IF(RYST.GT.COEF(ISUB,7)+COEF(ISUB,8)) MYST=3 CALL PYKMAP(2,MYST,RLU(0)) VINT(23)=SQRT(MAX(0.,1.-XT2/TAU))*(-1)**INT(1.5+RLU(0)) ENDIF VINT(71)=0.5*VINT(1)*SQRT(VINT(25)) C...Store results of cross-section calculation. ELSEIF(MMUL.EQ.4) THEN ISUB=MINT(1) XTS=VINT(25) IF(ISET(ISUB).EQ.1) XTS=VINT(21) IF(ISET(ISUB).EQ.2) XTS=(4.*VINT(48)+2.*VINT(63)+2.*VINT(64))/ & VINT(2) IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) XTS=VINT(26) RBIN=MAX(0.000001,MIN(0.999999,XTS*(1.+VINT(149))/ & (XTS+VINT(149)))) IRBIN=INT(1.+20.*RBIN) IF(ISUB.EQ.96) NMUL(IRBIN)=NMUL(IRBIN)+1 IF(ISUB.EQ.96) SIGM(IRBIN)=SIGM(IRBIN)+VINT(153) C...Choose impact parameter. ELSEIF(MMUL.EQ.5) THEN IF(MSTP(82).EQ.3) THEN VINT(148)=RLU(0)/(PARU(2)*VINT(147)) ELSE RTYPE=RLU(0) CQ2=PARP(84)**2 IF(RTYPE.LT.(1.-PARP(83))**2) THEN B2=-LOG(RLU(0)) ELSEIF(RTYPE.LT.1.-PARP(83)**2) THEN B2=-0.5*(1.+CQ2)*LOG(RLU(0)) ELSE B2=-CQ2*LOG(RLU(0)) ENDIF VINT(148)=((1.-PARP(83))**2*EXP(-MIN(100.,B2))+2.*PARP(83)* & (1.-PARP(83))*2./(1.+CQ2)*EXP(-MIN(100.,B2*2./(1.+CQ2)))+ & PARP(83)**2/CQ2*EXP(-MIN(100.,B2/CQ2)))/(PARU(2)*VINT(147)) ENDIF C...Multiple interactions (variable impact parameter) : reject with C...probability exp(-overlap*cross-section above pT/normalization). RNCOR=(IRBIN-20.*RBIN)*NMUL(IRBIN) SIGCOR=(IRBIN-20.*RBIN)*SIGM(IRBIN) DO 150 IBIN=IRBIN+1,20 RNCOR=RNCOR+NMUL(IBIN) 150 SIGCOR=SIGCOR+SIGM(IBIN) SIGABV=(SIGCOR/RNCOR)*VINT(149)*(1.-XTS)/(XTS+VINT(149)) VINT(150)=EXP(-MIN(100.,VINT(146)*VINT(148)*SIGABV/VINT(106))) C...Generate additional multiple semihard interactions. ELSEIF(MMUL.EQ.6) THEN DO 160 J=11,80 160 VINTSV(J)=VINT(J) C...Reconstruct strings in hard scattering. ISUB=MINT(1) NMAX=MINT(84)+4 IF(ISET(ISUB).EQ.1) NMAX=MINT(84)+2 NSTR=0 DO 180 I=MINT(84)+1,NMAX KCS=KCHG(LUCOMP(K(I,2)),2)*ISIGN(1,K(I,2)) IF(KCS.EQ.0) GOTO 180 DO 170 J=1,4 IF(KCS.EQ.1.AND.(J.EQ.2.OR.J.EQ.4)) GOTO 170 IF(KCS.EQ.-1.AND.(J.EQ.1.OR.J.EQ.3)) GOTO 170 IF(J.LE.2) THEN IST=MOD(K(I,J+3)/MSTU(5),MSTU(5)) ELSE IST=MOD(K(I,J+1),MSTU(5)) ENDIF IF(IST.LT.MINT(84).OR.IST.GT.I) GOTO 170 IF(KCHG(LUCOMP(K(IST,2)),2).EQ.0) GOTO 170 NSTR=NSTR+1 IF(J.EQ.1.OR.J.EQ.4) THEN KSTR(NSTR,1)=I KSTR(NSTR,2)=IST ELSE KSTR(NSTR,1)=IST KSTR(NSTR,2)=I ENDIF 170 CONTINUE 180 CONTINUE C...Set up starting values for iteration in xT2. XT2=VINT(25) IF(ISET(ISUB).EQ.1) XT2=VINT(21) IF(ISET(ISUB).EQ.2) XT2=(4.*VINT(48)+2.*VINT(63)+2.*VINT(64))/ & VINT(2) IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) XT2=VINT(26) ISUB=96 MINT(1)=96 IF(MSTP(82).LE.1) THEN XT2FAC=XSEC(ISUB,1)*VINT(149)/((1.-VINT(149))*VINT(106)) ELSE XT2FAC=VINT(146)*VINT(148)*XSEC(ISUB,1)/VINT(106)* & VINT(149)*(1.+VINT(149)) ENDIF VINT(63)=0. VINT(64)=0. VINT(151)=0. VINT(152)=0. VINT(143)=1.-VINT(141) VINT(144)=1.-VINT(142) C...Iterate downwards in xT2. 190 IF(MSTP(82).LE.1) THEN XT2=XT2FAC*XT2/(XT2FAC-XT2*LOG(RLU(0))) IF(XT2.LT.VINT(149)) GOTO 230 ELSE IF(XT2.LE.0.01*VINT(149)) GOTO 230 XT2=XT2FAC*(XT2+VINT(149))/(XT2FAC-(XT2+VINT(149))* & LOG(RLU(0)))-VINT(149) IF(XT2.LE.0.) GOTO 230 XT2=MAX(0.01*VINT(149),XT2) ENDIF VINT(25)=XT2 C...Choose tau and y*. Calculate cos(theta-hat). IF(RLU(0).LE.COEF(ISUB,1)) THEN TAUP=(2.*(1.+SQRT(1.-XT2))/XT2-1.)**RLU(0) TAU=XT2*(1.+TAUP)**2/(4.*TAUP) ELSE TAU=XT2*(1.+TAN(RLU(0)*ATAN(SQRT(1./XT2-1.)))**2) ENDIF VINT(21)=TAU CALL PYKLIM(2) RYST=RLU(0) MYST=1 IF(RYST.GT.COEF(ISUB,7)) MYST=2 IF(RYST.GT.COEF(ISUB,7)+COEF(ISUB,8)) MYST=3 CALL PYKMAP(2,MYST,RLU(0)) VINT(23)=SQRT(MAX(0.,1.-XT2/TAU))*(-1)**INT(1.5+RLU(0)) C...Check that x not used up. Accept or reject kinematical variables. X1M=SQRT(TAU)*EXP(VINT(22)) X2M=SQRT(TAU)*EXP(-VINT(22)) IF(VINT(143)-X1M.LT.0.01.OR.VINT(144)-X2M.LT.0.01) GOTO 190 VINT(71)=0.5*VINT(1)*SQRT(XT2) CALL PYSIGH(NCHN,SIGS) IF(SIGS.LT.XSEC(ISUB,1)*RLU(0)) GOTO 190 C...Reset K, P and V vectors. Select some variables. DO 200 I=N+1,N+2 DO 200 J=1,5 K(I,J)=0 P(I,J)=0. 200 V(I,J)=0. RFLAV=RLU(0) PT=0.5*VINT(1)*SQRT(XT2) PHI=PARU(2)*RLU(0) CTH=VINT(23) C...Add first parton to event record. K(N+1,1)=3 K(N+1,2)=21 IF(RFLAV.GE.MAX(PARP(85),PARP(86))) K(N+1,2)= & 1+INT((2.+PARJ(2))*RLU(0)) P(N+1,1)=PT*COS(PHI) P(N+1,2)=PT*SIN(PHI) P(N+1,3)=0.25*VINT(1)*(VINT(41)*(1.+CTH)-VINT(42)*(1.-CTH)) P(N+1,4)=0.25*VINT(1)*(VINT(41)*(1.+CTH)+VINT(42)*(1.-CTH)) P(N+1,5)=0. C...Add second parton to event record. K(N+2,1)=3 K(N+2,2)=21 IF(K(N+1,2).NE.21) K(N+2,2)=-K(N+1,2) P(N+2,1)=-P(N+1,1) P(N+2,2)=-P(N+1,2) P(N+2,3)=0.25*VINT(1)*(VINT(41)*(1.-CTH)-VINT(42)*(1.+CTH)) P(N+2,4)=0.25*VINT(1)*(VINT(41)*(1.-CTH)+VINT(42)*(1.+CTH)) P(N+2,5)=0. IF(RFLAV.LT.PARP(85).AND.NSTR.GE.1) THEN C....Choose relevant string pieces to place gluons on. DO 220 I=N+1,N+2 DMIN=1E8 DO 210 ISTR=1,NSTR I1=KSTR(ISTR,1) I2=KSTR(ISTR,2) DIST=(P(I,4)*P(I1,4)-P(I,1)*P(I1,1)-P(I,2)*P(I1,2)- & P(I,3)*P(I1,3))*(P(I,4)*P(I2,4)-P(I,1)*P(I2,1)- & P(I,2)*P(I2,2)-P(I,3)*P(I2,3))/MAX(1.,P(I1,4)*P(I2,4)- & P(I1,1)*P(I2,1)-P(I1,2)*P(I2,2)-P(I1,3)*P(I2,3)) IF(ISTR.EQ.1.OR.DIST.LT.DMIN) THEN DMIN=DIST IST1=I1 IST2=I2 ISTM=ISTR ENDIF 210 CONTINUE C....Colour flow adjustments, new string pieces. IF(K(IST1,4)/MSTU(5).EQ.IST2) K(IST1,4)=MSTU(5)*I+ & MOD(K(IST1,4),MSTU(5)) IF(MOD(K(IST1,5),MSTU(5)).EQ.IST2) K(IST1,5)= & MSTU(5)*(K(IST1,5)/MSTU(5))+I K(I,5)=MSTU(5)*IST1 K(I,4)=MSTU(5)*IST2 IF(K(IST2,5)/MSTU(5).EQ.IST1) K(IST2,5)=MSTU(5)*I+ & MOD(K(IST2,5),MSTU(5)) IF(MOD(K(IST2,4),MSTU(5)).EQ.IST1) K(IST2,4)= & MSTU(5)*(K(IST2,4)/MSTU(5))+I KSTR(ISTM,2)=I KSTR(NSTR+1,1)=I KSTR(NSTR+1,2)=IST2 220 NSTR=NSTR+1 C...String drawing and colour flow for gluon loop. ELSEIF(K(N+1,2).EQ.21) THEN K(N+1,4)=MSTU(5)*(N+2) K(N+1,5)=MSTU(5)*(N+2) K(N+2,4)=MSTU(5)*(N+1) K(N+2,5)=MSTU(5)*(N+1) KSTR(NSTR+1,1)=N+1 KSTR(NSTR+1,2)=N+2 KSTR(NSTR+2,1)=N+2 KSTR(NSTR+2,2)=N+1 NSTR=NSTR+2 C...String drawing and colour flow for qq~ pair. ELSE K(N+1,4)=MSTU(5)*(N+2) K(N+2,5)=MSTU(5)*(N+1) KSTR(NSTR+1,1)=N+1 KSTR(NSTR+1,2)=N+2 NSTR=NSTR+1 ENDIF C...Update remaining energy; iterate. N=N+2 IF(N.GT.MSTU(4)-MSTU(32)-10) THEN CALL LUERRM(11,'(PYMULT:) no more memory left in LUJETS') IF(MSTU(21).GE.1) RETURN ENDIF MINT(31)=MINT(31)+1 VINT(151)=VINT(151)+VINT(41) VINT(152)=VINT(152)+VINT(42) VINT(143)=VINT(143)-VINT(41) VINT(144)=VINT(144)-VINT(42) IF(MINT(31).LT.240) GOTO 190 230 CONTINUE DO 240 J=11,80 240 VINT(J)=VINTSV(J) ENDIF C...Format statements for printout. 1000 FORMAT(/1X,'****** PYMULT: initialization of multiple inter', &'actions for MSTP(82) =',I2,' ******') 1100 FORMAT(8X,'pT0 =',F5.2,' GeV gives sigma(parton-parton) =',1P, &E9.2,' mb: rejected') 1200 FORMAT(8X,'pT0 =',F5.2,' GeV gives sigma(parton-parton) =',1P, &E9.2,' mb: accepted') RETURN END C********************************************************************* SUBROUTINE PYREMN(IPU1,IPU2) C...Adds on target remnants (one or two from each side) and C...includes primordial kT. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/ SAVE /PYPARS/,/PYINT1/ DIMENSION KFLCH(2),KFLSP(2),CHI(2),PMS(6),IS(2),ROBO(5) C...Special case for lepton-lepton interaction. IF(MINT(43).EQ.1) THEN DO 100 JT=1,2 I=MINT(83)+JT+2 K(I,1)=21 K(I,2)=K(I-2,2) K(I,3)=I-2 DO 100 J=1,5 100 P(I,J)=P(I-2,J) ENDIF C...Find event type, set pointers. IF(IPU1.EQ.0.AND.IPU2.EQ.0) RETURN ISUB=MINT(1) ILEP=0 IF(IPU1.EQ.0) ILEP=1 IF(IPU2.EQ.0) ILEP=2 IF(ISUB.EQ.95) ILEP=-1 IF(ILEP.EQ.1) IQ=MINT(84)+1 IF(ILEP.EQ.2) IQ=MINT(84)+2 IP=MAX(IPU1,IPU2) ILEPR=MINT(83)+5-ILEP NS=N C...Define initial partons, including primordial kT. 110 DO 130 JT=1,2 I=MINT(83)+JT+2 IF(JT.EQ.1) IPU=IPU1 IF(JT.EQ.2) IPU=IPU2 K(I,1)=21 K(I,3)=I-2 IF(ISUB.EQ.95) THEN K(I,2)=21 SHS=0. ELSEIF(MINT(40+JT).EQ.1.AND.IPU.NE.0) THEN K(I,2)=K(IPU,2) P(I,5)=P(IPU,5) P(I,1)=0. P(I,2)=0. PMS(JT)=P(I,5)**2 ELSEIF(IPU.NE.0) THEN K(I,2)=K(IPU,2) P(I,5)=P(IPU,5) C...No primordial kT or chosen according to truncated Gaussian or C...exponential. 120 IF(MSTP(91).LE.0) THEN PT=0. ELSEIF(MSTP(91).EQ.1) THEN PT=PARP(91)*SQRT(-LOG(RLU(0))) ELSE RPT1=RLU(0) RPT2=RLU(0) PT=-PARP(92)*LOG(RPT1*RPT2) ENDIF IF(PT.GT.PARP(93)) GOTO 120 PHI=PARU(2)*RLU(0) P(I,1)=PT*COS(PHI) P(I,2)=PT*SIN(PHI) PMS(JT)=P(I,5)**2+P(I,1)**2+P(I,2)**2 ELSE K(I,2)=K(IQ,2) Q2=VINT(52) P(I,5)=-SQRT(Q2) PMS(JT)=-Q2 SHS=(1.-VINT(43-JT))*Q2/VINT(43-JT)+VINT(5-JT)**2 ENDIF 130 CONTINUE C...Kinematics construction for initial partons. I1=MINT(83)+3 I2=MINT(83)+4 IF(ILEP.EQ.0) SHS=VINT(141)*VINT(142)*VINT(2)+ &(P(I1,1)+P(I2,1))**2+(P(I1,2)+P(I2,2))**2 SHR=SQRT(MAX(0.,SHS)) IF(ILEP.EQ.0) THEN IF((SHS-PMS(1)-PMS(2))**2-4.*PMS(1)*PMS(2).LE.0.) GOTO 110 P(I1,4)=0.5*(SHR+(PMS(1)-PMS(2))/SHR) P(I1,3)=SQRT(MAX(0.,P(I1,4)**2-PMS(1))) P(I2,4)=SHR-P(I1,4) P(I2,3)=-P(I1,3) ELSEIF(ILEP.EQ.1) THEN P(I1,4)=P(IQ,4) P(I1,3)=P(IQ,3) P(I2,4)=P(IP,4) P(I2,3)=P(IP,3) ELSEIF(ILEP.EQ.2) THEN P(I1,4)=P(IP,4) P(I1,3)=P(IP,3) P(I2,4)=P(IQ,4) P(I2,3)=P(IQ,3) ENDIF IF(MINT(43).EQ.1) RETURN C...Transform partons to overall CM-frame (not for leptoproduction). IF(ILEP.EQ.0) THEN ROBO(3)=(P(I1,1)+P(I2,1))/SHR ROBO(4)=(P(I1,2)+P(I2,2))/SHR CALL LUDBRB(I1,I2,0.,0.,-DBLE(ROBO(3)),-DBLE(ROBO(4)),0D0) ROBO(2)=ULANGL(P(I1,1),P(I1,2)) CALL LUDBRB(I1,I2,0.,-ROBO(2),0D0,0D0,0D0) ROBO(1)=ULANGL(P(I1,3),P(I1,1)) CALL LUDBRB(I1,I2,-ROBO(1),0.,0D0,0D0,0D0) NMAX=MAX(MINT(52),IPU1,IPU2) CALL LUDBRB(I1,NMAX,ROBO(1),ROBO(2),DBLE(ROBO(3)),DBLE(ROBO(4)), & 0D0) ROBO(5)=MAX(-0.999999,MIN(0.999999,(VINT(141)-VINT(142))/ & (VINT(141)+VINT(142)))) CALL LUDBRB(I1,NMAX,0.,0.,0D0,0D0,DBLE(ROBO(5))) ENDIF C...Check invariant mass of remnant system: C...hadronic events or leptoproduction. IF(ILEP.LE.0) THEN IF(MSTP(81).LE.0.OR.MSTP(82).LE.0.OR.ISUB.EQ.95) THEN VINT(151)=0. VINT(152)=0. ENDIF PEH=P(I1,4)+P(I2,4)+0.5*VINT(1)*(VINT(151)+VINT(152)) PZH=P(I1,3)+P(I2,3)+0.5*VINT(1)*(VINT(151)-VINT(152)) SHH=(VINT(1)-PEH)**2-(P(I1,1)+P(I2,1))**2-(P(I1,2)+P(I2,2))**2- & PZH**2 PMMIN=P(MINT(83)+1,5)+P(MINT(83)+2,5)+ULMASS(K(I1,2))+ & ULMASS(K(I2,2)) IF(SHR.GE.VINT(1).OR.SHH.LE.(PMMIN+PARP(111))**2) THEN MINT(51)=1 RETURN ENDIF SHR=SQRT(SHH+(P(I1,1)+P(I2,1))**2+(P(I1,2)+P(I2,2))**2) ELSE PEI=P(IQ,4)+P(IP,4) PZI=P(IQ,3)+P(IP,3) PMS(ILEP)=MAX(0.,PEI**2-PZI**2) PMMIN=P(ILEPR-2,5)+ULMASS(K(ILEPR,2))+SQRT(PMS(ILEP)) IF(SHR.LE.PMMIN+PARP(111)) THEN MINT(51)=1 RETURN ENDIF ENDIF C...Subdivide remnant if necessary, store first parton. 140 I=NS DO 190 JT=1,2 IF(JT.EQ.ILEP) GOTO 190 IF(JT.EQ.1) IPU=IPU1 IF(JT.EQ.2) IPU=IPU2 CALL PYSPLI(MINT(10+JT),MINT(12+JT),KFLCH(JT),KFLSP(JT)) I=I+1 IS(JT)=I DO 150 J=1,5 K(I,J)=0 P(I,J)=0. 150 V(I,J)=0. K(I,1)=3 K(I,2)=KFLSP(JT) K(I,3)=MINT(83)+JT P(I,5)=ULMASS(K(I,2)) C...First parton colour connections and transverse mass. KFLS=(3-KCHG(LUCOMP(KFLSP(JT)),2)*ISIGN(1,KFLSP(JT)))/2 K(I,KFLS+3)=IPU K(IPU,6-KFLS)=MOD(K(IPU,6-KFLS),MSTU(5))+MSTU(5)*I IF(KFLCH(JT).EQ.0) THEN P(I,1)=-P(MINT(83)+JT+2,1) P(I,2)=-P(MINT(83)+JT+2,2) PMS(JT)=P(I,5)**2+P(I,1)**2+P(I,2)**2 C...When extra remnant parton or hadron: find relative pT, store. ELSE CALL LUPTDI(1,P(I,1),P(I,2)) PMS(JT+2)=P(I,5)**2+P(I,1)**2+P(I,2)**2 I=I+1 DO 160 J=1,5 K(I,J)=0 P(I,J)=0. 160 V(I,J)=0. K(I,1)=1 K(I,2)=KFLCH(JT) K(I,3)=MINT(83)+JT P(I,5)=ULMASS(K(I,2)) P(I,1)=-P(MINT(83)+JT+2,1)-P(I-1,1) P(I,2)=-P(MINT(83)+JT+2,2)-P(I-1,2) PMS(JT+4)=P(I,5)**2+P(I,1)**2+P(I,2)**2 C...Relative distribution of energy for particle into two jets. IMB=1 IF(MOD(MINT(10+JT)/1000,10).NE.0) IMB=2 IF(IABS(KFLCH(JT)).LE.10.OR.KFLCH(JT).EQ.21) THEN CHIK=PARP(92+2*IMB) IF(MSTP(92).LE.1) THEN IF(IMB.EQ.1) CHI(JT)=RLU(0) IF(IMB.EQ.2) CHI(JT)=1.-SQRT(RLU(0)) ELSEIF(MSTP(92).EQ.2) THEN CHI(JT)=1.-RLU(0)**(1./(1.+CHIK)) ELSEIF(MSTP(92).EQ.3) THEN CUT=2.*0.3/VINT(1) 170 CHI(JT)=RLU(0)**2 IF((CHI(JT)**2/(CHI(JT)**2+CUT**2))**0.25*(1.-CHI(JT))**CHIK & .LT.RLU(0)) GOTO 170 ELSE CUT=2.*0.3/VINT(1) CUTR=(1.+SQRT(1.+CUT**2))/CUT 180 CHIR=CUT*CUTR**RLU(0) CHI(JT)=(CHIR**2-CUT**2)/(2.*CHIR) IF((1.-CHI(JT))**CHIK.LT.RLU(0)) GOTO 180 ENDIF C...Relative distribution of energy for particle into jet plus particle. ELSE IF(MSTP(92).LE.1) THEN IF(IMB.EQ.1) CHI(JT)=RLU(0) IF(IMB.EQ.2) CHI(JT)=1.-SQRT(RLU(0)) ELSE CHI(JT)=1.-RLU(0)**(1./(1.+PARP(93+2*IMB))) ENDIF IF(MOD(KFLCH(JT)/1000,10).NE.0) CHI(JT)=1.-CHI(JT) ENDIF PMS(JT)=PMS(JT+4)/CHI(JT)+PMS(JT+2)/(1.-CHI(JT)) KFLS=KCHG(LUCOMP(KFLCH(JT)),2)*ISIGN(1,KFLCH(JT)) IF(KFLS.NE.0) THEN K(I,1)=3 KFLS=(3-KFLS)/2 K(I,KFLS+3)=IPU K(IPU,6-KFLS)=MOD(K(IPU,6-KFLS),MSTU(5))+MSTU(5)*I ENDIF ENDIF 190 CONTINUE IF(SHR.LE.SQRT(PMS(1))+SQRT(PMS(2))) GOTO 140 N=I C...Reconstruct kinematics of remnants. DO 200 JT=1,2 IF(JT.EQ.ILEP) GOTO 200 PE=0.5*(SHR+(PMS(JT)-PMS(3-JT))/SHR) PZ=SQRT(PE**2-PMS(JT)) IF(KFLCH(JT).EQ.0) THEN P(IS(JT),4)=PE P(IS(JT),3)=PZ*(-1)**(JT-1) ELSE PW1=CHI(JT)*(PE+PZ) P(IS(JT)+1,4)=0.5*(PW1+PMS(JT+4)/PW1) P(IS(JT)+1,3)=0.5*(PW1-PMS(JT+4)/PW1)*(-1)**(JT-1) P(IS(JT),4)=PE-P(IS(JT)+1,4) P(IS(JT),3)=PZ*(-1)**(JT-1)-P(IS(JT)+1,3) ENDIF 200 CONTINUE C...Hadronic events: boost remnants to correct longitudinal frame. IF(ILEP.LE.0) THEN CALL LUDBRB(NS+1,N,0.,0.,0D0,0D0,-DBLE(PZH/(VINT(1)-PEH))) C...Leptoproduction events: boost colliding subsystem. ELSE NMAX=MAX(IP,MINT(52)) PEF=SHR-PE PZF=PZ*(-1)**(ILEP-1) PT2=P(ILEPR,1)**2+P(ILEPR,2)**2 PHIPT=ULANGL(P(ILEPR,1),P(ILEPR,2)) CALL LUDBRB(MINT(84)+1,NMAX,0.,-PHIPT,0D0,0D0,0D0) RQP=P(IQ,3)*(PT2+PEI**2)-P(IQ,4)*PEI*PZI SINTH=P(IQ,4)*SQRT(PT2*(PT2+PEI**2)/(RQP**2+PT2* & P(IQ,4)**2*PZI**2))*SIGN(1.,-RQP) CALL LUDBRB(MINT(84)+1,NMAX,ASIN(SINTH),0.,0D0,0D0,0D0) BETAX=(-PEI*PZI*SINTH+SQRT(PT2*(PT2+PEI**2-(PZI*SINTH)**2)))/ & (PT2+PEI**2) CALL LUDBRB(MINT(84)+1,NMAX,0.,0.,DBLE(BETAX),0D0,0D0) CALL LUDBRB(MINT(84)+1,NMAX,0.,PHIPT,0D0,0D0,0D0) PEM=P(IQ,4)+P(IP,4) PZM=P(IQ,3)+P(IP,3) BETAZ=(-PEM*PZM+PZF*SQRT(PZF**2+PEM**2-PZM**2))/(PZF**2+PEM**2) CALL LUDBRB(MINT(84)+1,NMAX,0.,0.,0D0,0D0,DBLE(BETAZ)) CALL LUDBRB(I1,I2,ASIN(SINTH),0.,DBLE(BETAX),0D0,0D0) CALL LUDBRB(I1,I2,0.,PHIPT,0D0,0D0,DBLE(BETAZ)) ENDIF RETURN END C********************************************************************* SUBROUTINE PYRESD C...Allows resonances to decay (including parton showers for hadronic C...channels). IMPLICIT DOUBLE PRECISION(D) COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT4/ DIMENSION IREF(10,6),KDCY(2),KFL1(2),KFL2(2),NSD(2),ILIN(6), &COUP(6,4),PK(6,4),PKK(6,6),CTHE(2),PHI(2),WDTP(0:40), &WDTE(0:40,0:5) COMPLEX FGK,HA(6,6),HC(6,6) C...The F, Xi and Xj functions of Gunion and Kunszt C...(Phys. Rev. D33, 665, plus errata from the authors). FGK(I1,I2,I3,I4,I5,I6)=4.*HA(I1,I3)*HC(I2,I6)*(HA(I1,I5)* &HC(I1,I4)+HA(I3,I5)*HC(I3,I4)) DIGK(DT,DU)=-4.*D34*D56+DT*(3.*DT+4.*DU)+DT**2*(DT*DU/(D34*D56)- &2.*(1./D34+1./D56)*(DT+DU)+2.*(D34/D56+D56/D34)) DJGK(DT,DU)=8.*(D34+D56)**2-8.*(D34+D56)*(DT+DU)-6.*DT*DU- &2.*DT*DU*(DT*DU/(D34*D56)-2.*(1./D34+1./D56)*(DT+DU)+ &2.*(D34/D56+D56/D34)) C...Some general constants. XW=PARU(102) SQMZ=PMAS(23,1)**2 GZMZ=PMAS(23,1)*PMAS(23,2) SQMW=PMAS(24,1)**2 GZMW=PMAS(24,1)*PMAS(24,2) SQMZP=PMAS(32,1)**2 GZMZP=PMAS(32,1)*PMAS(32,2) SH=VINT(44) C...Define initial two objects. ISUB=MINT(1) IF(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.3) THEN IREF(1,1)=MINT(84)+2+ISET(ISUB) IREF(1,2)=0 IREF(1,3)=MINT(83)+6+ISET(ISUB) IREF(1,4)=0 ELSEIF(ISET(ISUB).EQ.2.OR.ISET(ISUB).EQ.4) THEN IREF(1,1)=MINT(84)+1+ISET(ISUB) IREF(1,2)=MINT(84)+2+ISET(ISUB) IREF(1,3)=MINT(83)+5+ISET(ISUB) IREF(1,4)=MINT(83)+6+ISET(ISUB) ENDIF IF(K(IREF(1,1),1).GT.10) THEN KFA=IABS(K(IREF(1,1),2)) KDA=MOD(K(IREF(1,1),4),MSTU(4)) IF(KFA.GE.23.AND.KFA.LE.40.AND.KDA.GT.1) IREF(1,1)=KDA ENDIF IF(K(IREF(1,2),1).GT.10) THEN KFA=IABS(K(IREF(1,2),2)) KDA=MOD(K(IREF(1,2),4),MSTU(4)) IF(KFA.GE.23.AND.KFA.LE.40.AND.KDA.GT.1) IREF(1,2)=KDA ENDIF IREF(1,5)=0 IREF(1,6)=0 C...Loop over decay history. NP=1 IP=0 100 IP=IP+1 NINH=0 JTMAX=2 IF(IP.EQ.1.AND.(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.3)) JTMAX=1 C...Start treatment of one or two resonances in parallel. DO 120 JT=1,JTMAX ID=IREF(IP,JT) KDCY(JT)=0 KFL1(JT)=0 KFL2(JT)=0 NSD(JT)=ID IF(ID.EQ.0) GOTO 120 KFA=IABS(K(ID,2)) IF(KFA.LT.23.OR.KFA.GT.40) GOTO 120 IF(K(ID,1).GT.10.OR.MDCY(KFA,1).EQ.0) GOTO 120 C...Select decay channel. IF(ISUB.EQ.1.OR.ISUB.EQ.141) MINT(61)=1 CALL PYWIDT(KFA,P(ID,5),WDTP,WDTE) IF(KCHG(KFA,3).EQ.0) THEN IPM=2 ELSE IPM=(5+ISIGN(1,K(ID,2)))/2 ENDIF IF(JTMAX.EQ.1) THEN I12=4 ELSEIF(KFA.NE.IABS(K(IREF(IP,3-JT),2))) THEN I12=4 ELSEIF(JT.EQ.1) THEN I12=INT(4.5+RLU(0)) ELSE I12=9-I12 ENDIF IF(WDTE(0,1)+WDTE(0,IPM)+WDTE(0,I12).LE.0.) GOTO 120 RKFL=(WDTE(0,1)+WDTE(0,IPM)+WDTE(0,I12))*RLU(0) IDL=0 110 IDL=IDL+1 IDC=IDL+MDCY(KFA,2)-1 RKFL=RKFL-(WDTE(IDL,1)+WDTE(IDL,IPM)+WDTE(IDL,I12)) IF(IDL.LT.MDCY(KFA,3).AND.RKFL.GT.0.) GOTO 110 C...Read out and classify decay channel chosen. KFL1(JT)=KFDP(IDC,1)*ISIGN(1,K(ID,2)) IF(KCHG(IABS(KFL1(JT)),3).EQ.0) KFL1(JT)=IABS(KFL1(JT)) KFL2(JT)=KFDP(IDC,2)*ISIGN(1,K(ID,2)) IF(KCHG(IABS(KFL2(JT)),3).EQ.0) KFL2(JT)=IABS(KFL2(JT)) KDCY(JT)=2 IF(IABS(KFL1(JT)).LE.10.OR.KFL1(JT).EQ.21) KDCY(JT)=1 IF(IABS(KFL1(JT)).GE.23.AND.IABS(KFL1(JT)).LE.40) KDCY(JT)=3 NSD(JT)=N C...Select masses and check that mass sum not too large. PMM1=PMAS(IABS(KFL1(JT)),1) PMM2=PMAS(IABS(KFL2(JT)),1) IF(MSTP(42).LE.0) THEN P(N+1,5)=PMM1 P(N+2,5)=PMM2 ELSEIF(PMM1+PMM2.LT.P(ID,5)) THEN 112 P(N+1,5)=ULMASS(KFL1(JT)) P(N+2,5)=ULMASS(KFL2(JT)) IF(P(ID,5).LE.P(N+1,5)+P(N+2,5)+PARJ(64)) GOTO 112 ELSE C...Special case for H0 -> Z + Z* or W + W* KFLSTR=IABS(KFL1(JT)) PMSTR=PMAS(KFLSTR,1) GASTR=PMAS(KFLSTR,2) PMLSTR=MAX(0.,CKIN(41)) PMUSTR=P(ID,5)-PMSTR IF(CKIN(42).GT.CKIN(41)) PMUSTR=MIN(P(ID,5)-PMSTR,CKIN(42)) ATLSTR=ATAN((PMLSTR**2-PMSTR**2)/(PMSTR*GASTR)) ATUSTR=ATAN((PMUSTR**2-PMSTR**2)/(PMSTR*GASTR)) 114 PM2STR=PMSTR**2+PMSTR*GASTR*TAN(ATLSTR+RLU(0)*(ATUSTR-ATLSTR)) PMASTR=MIN(PMUSTR,SQRT(MAX(PMLSTR**2,PM2STR))) PMRSTR=ULMASS(KFLSTR) IF(P(ID,5).LE.PMASTR+PMRSTR+PARJ(64)) GOTO 114 RM1STR=(PMASTR/P(ID,5))**2 RM2STR=(PMRSTR/P(ID,5))**2 WTSTR=((1.-RM1STR-RM2STR)**2+8.*RM1STR*RM2STR)* & SQRT(MAX(0.,(1.-RM1STR-RM2STR)**2-4.*RM1STR*RM2STR)) IF(WTSTR.LT.RLU(0)) GOTO 114 IDSTR=N+1+INT(0.5+RLU(0)) P(IDSTR,5)=PMASTR P(2*N+3-IDSTR,5)=PMRSTR ENDIF C...Fill decay products, prepared for parton showers for quarks. MSTU(10)=1 IF(KDCY(JT).EQ.1) THEN CALL LU2ENT(-(N+1),KFL1(JT),KFL2(JT),P(ID,5)) ELSE CALL LU2ENT(N+1,KFL1(JT),KFL2(JT),P(ID,5)) ENDIF MSTU(10)=2 120 IF(KFA.GE.23.AND.KFA.LE.40.AND.KFL1(JT).EQ.0) NINH=NINH+1 IF(JTMAX.EQ.1.AND.KDCY(1).EQ.0) GOTO 280 IF(JTMAX.EQ.2.AND.KDCY(1).EQ.0.AND.KDCY(2).EQ.0) GOTO 280 IF(JTMAX.EQ.2.AND.MSTP(45).GE.1.AND.NINH.EQ.0) THEN C...Order incoming partons and outgoing resonances. ILIN(1)=MINT(84)+1 IF(K(MINT(84)+1,2).GT.0) ILIN(1)=MINT(84)+2 IF(K(ILIN(1),2).EQ.21) ILIN(1)=2*MINT(84)+3-ILIN(1) ILIN(2)=2*MINT(84)+3-ILIN(1) IMIN=1 IF(IREF(IP,5).EQ.25) IMIN=3 IMAX=2 IORD=1 IF(K(IREF(IP,1),2).EQ.23) IORD=2 IF(K(IREF(IP,1),2).EQ.24.AND.K(IREF(IP,2),2).EQ.-24) IORD=2 IF(IABS(K(IREF(IP,IORD),2)).EQ.25) IORD=3-IORD IF(KDCY(IORD).EQ.0) IORD=3-IORD C...Order decay products of resonances. DO 130 JT=IORD,3-IORD,3-2*IORD IF(KDCY(JT).EQ.0) THEN ILIN(IMAX+1)=NSD(JT) IMAX=IMAX+1 ELSEIF(K(NSD(JT)+1,2).GT.0) THEN ILIN(IMAX+1)=N+2*JT-1 ILIN(IMAX+2)=N+2*JT IMAX=IMAX+2 K(N+2*JT-1,2)=K(NSD(JT)+1,2) K(N+2*JT,2)=K(NSD(JT)+2,2) ELSE ILIN(IMAX+1)=N+2*JT ILIN(IMAX+2)=N+2*JT-1 IMAX=IMAX+2 K(N+2*JT-1,2)=K(NSD(JT)+1,2) K(N+2*JT,2)=K(NSD(JT)+2,2) ENDIF 130 CONTINUE C...Find charge, isospin, left- and righthanded couplings. DO 150 I=IMIN,IMAX DO 140 J=1,4 140 COUP(I,J)=0. KFA=IABS(K(ILIN(I),2)) IF(KFA.EQ.0.OR.KFA.GT.20) GOTO 150 COUP(I,1)=KCHG(KFA,1)/3. COUP(I,2)=(-1)**MOD(KFA,2) COUP(I,4)=-2.*COUP(I,1)*XW COUP(I,3)=COUP(I,2)+COUP(I,4) 150 CONTINUE ENDIF C...Select random angles (begin of weighting procedure). 160 DO 170 JT=1,JTMAX IF(KDCY(JT).EQ.0) GOTO 170 IF(JTMAX.EQ.1) THEN CTHE(JT)=VINT(13)+(VINT(33)-VINT(13)+VINT(34)-VINT(14))*RLU(0) IF(CTHE(JT).GT.VINT(33)) CTHE(JT)=CTHE(JT)+VINT(14)-VINT(33) PHI(JT)=VINT(24) ELSE CTHE(JT)=2.*RLU(0)-1. PHI(JT)=PARU(2)*RLU(0) ENDIF 170 CONTINUE IF(JTMAX.EQ.2.AND.MSTP(45).GE.1.AND.NINH.EQ.0) THEN C...Construct massless four-vectors. DO 180 I=N+1,N+4 K(I,1)=1 DO 180 J=1,5 180 P(I,J)=0. DO 190 JT=1,JTMAX IF(KDCY(JT).EQ.0) GOTO 190 ID=IREF(IP,JT) P(N+2*JT-1,3)=0.5*P(ID,5) P(N+2*JT-1,4)=0.5*P(ID,5) P(N+2*JT,3)=-0.5*P(ID,5) P(N+2*JT,4)=0.5*P(ID,5) CALL LUDBRB(N+2*JT-1,N+2*JT,ACOS(CTHE(JT)),PHI(JT),DBLE(P(ID,1)/ & P(ID,4)),DBLE(P(ID,2)/P(ID,4)),DBLE(P(ID,3)/P(ID,4))) 190 CONTINUE C...Store incoming and outgoing momenta, with random rotation to C...avoid accidental zeroes in HA expressions. DO 200 I=1,IMAX K(N+4+I,1)=1 P(N+4+I,4)=SQRT(P(ILIN(I),1)**2+P(ILIN(I),2)**2+P(ILIN(I),3)**2+ & P(ILIN(I),5)**2) P(N+4+I,5)=P(ILIN(I),5) DO 200 J=1,3 200 P(N+4+I,J)=P(ILIN(I),J) 210 THERR=ACOS(2.*RLU(0)-1.) PHIRR=PARU(2)*RLU(0) CALL LUDBRB(N+5,N+4+IMAX,THERR,PHIRR,0D0,0D0,0D0) DO 220 I=1,IMAX IF(P(N+4+I,1)**2+P(N+4+I,2)**2.LT.1E-4*P(N+4+I,4)**2) GOTO 210 DO 220 J=1,4 220 PK(I,J)=P(N+4+I,J) C...Calculate internal products. IF(ISUB.EQ.22.OR.ISUB.EQ.23.OR.ISUB.EQ.25.OR.ISUB.EQ.141.OR. & ISUB.EQ.142) THEN DO 230 I1=IMIN,IMAX-1 DO 230 I2=I1+1,IMAX HA(I1,I2)=SQRT((PK(I1,4)-PK(I1,3))*(PK(I2,4)+PK(I2,3))/ & (1E-20+PK(I1,1)**2+PK(I1,2)**2))*CMPLX(PK(I1,1),PK(I1,2))- & SQRT((PK(I1,4)+PK(I1,3))*(PK(I2,4)-PK(I2,3))/ & (1E-20+PK(I2,1)**2+PK(I2,2)**2))*CMPLX(PK(I2,1),PK(I2,2)) HC(I1,I2)=CONJG(HA(I1,I2)) IF(I1.LE.2) HA(I1,I2)=CMPLX(0.,1.)*HA(I1,I2) IF(I1.LE.2) HC(I1,I2)=CMPLX(0.,1.)*HC(I1,I2) HA(I2,I1)=-HA(I1,I2) 230 HC(I2,I1)=-HC(I1,I2) ENDIF DO 240 I=1,2 DO 240 J=1,4 240 PK(I,J)=-PK(I,J) DO 250 I1=IMIN,IMAX-1 DO 250 I2=I1+1,IMAX PKK(I1,I2)=2.*(PK(I1,4)*PK(I2,4)-PK(I1,1)*PK(I2,1)- & PK(I1,2)*PK(I2,2)-PK(I1,3)*PK(I2,3)) 250 PKK(I2,I1)=PKK(I1,I2) ENDIF IF(MSTP(45).LE.0.OR.NINH.NE.0) THEN C...Isotropic decay selected by user. WT=1. WTMAX=1. ELSEIF(IREF(IP,5).EQ.25) THEN C...Angular weight for H0 -> Z0 + Z0 or W+ + W- -> 4 quarks/leptons. WT=16.*PKK(3,5)*PKK(4,6) IF(IP.EQ.1) WTMAX=SH**2 IF(IP.GE.2) WTMAX=P(IREF(IP,6),5)**4 ELSEIF(ISUB.EQ.1) THEN IF(IP.EQ.1.AND.(KDCY(1).EQ.1.OR.KDCY(1).EQ.2)) THEN C...Angular weight for gamma*/Z0 -> 2 quarks/leptons. EI=KCHG(IABS(MINT(15)),1)/3. AI=SIGN(1.,EI+0.1) VI=AI-4.*EI*XW EF=KCHG(IABS(KFL1(1)),1)/3. AF=SIGN(1.,EF+0.1) VF=AF-4.*EF*XW GG=1. GZ=1./(8.*XW*(1.-XW))*SH*(SH-SQMZ)/((SH-SQMZ)**2+GZMZ**2) ZZ=1./(16.*XW*(1.-XW))**2*SH**2/((SH-SQMZ)**2+GZMZ**2) IF(MSTP(43).EQ.1) THEN C...Only gamma* production included. GZ=0. ZZ=0. ELSEIF(MSTP(43).EQ.2) THEN C...Only Z0 production included. GG=0. GZ=0. ENDIF ASYM=2.*(EI*AI*GZ*EF*AF+4.*VI*AI*ZZ*VF*AF)/(EI**2*GG*EF**2+ & EI*VI*GZ*EF*VF+(VI**2+AI**2)*ZZ*(VF**2+AF**2)) WT=1.+ASYM*CTHE(1)*ISIGN(1,MINT(15)*KFL1(1))+CTHE(1)**2 WTMAX=2.+ABS(ASYM) ELSEIF(IP.EQ.1.AND.KDCY(1).EQ.3) THEN C...Angular weight for gamma*/Z0 -> H+ + H-. WT=1.-CTHE(1)**2 WTMAX=1. ENDIF ELSEIF(ISUB.EQ.2) THEN C...Angular weight for W+/- -> 2 quarks/leptons. WT=(1.+CTHE(1)*ISIGN(1,MINT(15)*KFL1(1)))**2 WTMAX=4. ELSEIF(ISUB.EQ.15.OR.ISUB.EQ.19) THEN C...Angular weight for f + f~ -> gluon/gamma + Z0 -> C...-> gluon/gamma + 2 quarks/leptons. WT=((COUP(1,3)*COUP(3,3))**2+(COUP(1,4)*COUP(3,4))**2)* & (PKK(1,3)**2+PKK(2,4)**2)+((COUP(1,3)*COUP(3,4))**2+ & (COUP(1,4)*COUP(3,3))**2)*(PKK(1,4)**2+PKK(2,3)**2) WTMAX=(COUP(1,3)**2+COUP(1,4)**2)*(COUP(3,3)**2+COUP(3,4)**2)* & ((PKK(1,3)+PKK(1,4))**2+(PKK(2,3)+PKK(2,4))**2) ELSEIF(ISUB.EQ.16.OR.ISUB.EQ.20) THEN C...Angular weight for f + f~' -> gluon/gamma + W+/- -> C...-> gluon/gamma + 2 quarks/leptons. WT=PKK(1,3)**2+PKK(2,4)**2 WTMAX=(PKK(1,3)+PKK(1,4))**2+(PKK(2,3)+PKK(2,4))**2 ELSEIF(ISUB.EQ.22) THEN C...Angular weight for f + f~ -> Z0 + Z0 -> 4 quarks/leptons. S34=P(IREF(IP,IORD),5)**2 S56=P(IREF(IP,3-IORD),5)**2 TI=PKK(1,3)+PKK(1,4)+S34 UI=PKK(1,5)+PKK(1,6)+S56 FGK135=ABS(FGK(1,2,3,4,5,6)/TI+FGK(1,2,5,6,3,4)/UI) FGK145=ABS(FGK(1,2,4,3,5,6)/TI+FGK(1,2,5,6,4,3)/UI) FGK136=ABS(FGK(1,2,3,4,6,5)/TI+FGK(1,2,6,5,3,4)/UI) FGK146=ABS(FGK(1,2,4,3,6,5)/TI+FGK(1,2,6,5,4,3)/UI) FGK253=ABS(FGK(2,1,5,6,3,4)/TI+FGK(2,1,3,4,5,6)/UI) FGK263=ABS(FGK(2,1,6,5,3,4)/TI+FGK(2,1,3,4,6,5)/UI) FGK254=ABS(FGK(2,1,5,6,4,3)/TI+FGK(2,1,4,3,5,6)/UI) FGK264=ABS(FGK(2,1,6,5,4,3)/TI+FGK(2,1,4,3,6,5)/UI) WT=COUP(1,3)**4*((COUP(3,3)*COUP(5,3)*FGK135)**2+(COUP(3,4)* & COUP(5,3)*FGK145)**2+(COUP(3,3)*COUP(5,4)*FGK136)**2+ & (COUP(3,4)*COUP(5,4)*FGK146)**2)+COUP(1,4)**4*((COUP(3,3)* & COUP(5,3)*FGK253)**2+(COUP(3,4)*COUP(5,3)*FGK263)**2+ & (COUP(3,3)*COUP(5,4)*FGK254)**2+(COUP(3,4)*COUP(5,4)* & FGK264)**2) WTMAX=4.*S34*S56*(COUP(1,3)**4+COUP(1,4)**4)*(COUP(3,3)**2+ & COUP(3,4)**2)*(COUP(5,3)**2+COUP(5,4)**2)*4.*(TI/UI+UI/TI+ & 2.*SH*(S34+S56)/(TI*UI)-S34*S56*(1./TI**2+1./UI**2)) ELSEIF(ISUB.EQ.23) THEN C...Angular weight for f + f~' -> Z0 + W+/- -> 4 quarks/leptons. D34=P(IREF(IP,IORD),5)**2 D56=P(IREF(IP,3-IORD),5)**2 DT=PKK(1,3)+PKK(1,4)+D34 DU=PKK(1,5)+PKK(1,6)+D56 CAWZ=COUP(2,3)/SNGL(DT)-2.*(1.-XW)*COUP(1,2)/(SH-SQMW) CBWZ=COUP(1,3)/SNGL(DU)+2.*(1.-XW)*COUP(1,2)/(SH-SQMW) FGK135=ABS(CAWZ*FGK(1,2,3,4,5,6)+CBWZ*FGK(1,2,5,6,3,4)) FGK136=ABS(CAWZ*FGK(1,2,3,4,6,5)+CBWZ*FGK(1,2,6,5,3,4)) WT=(COUP(5,3)*FGK135)**2+(COUP(5,4)*FGK136)**2 WTMAX=4.*D34*D56*(COUP(5,3)**2+COUP(5,4)**2)*(CAWZ**2* & DIGK(DT,DU)+CBWZ**2*DIGK(DU,DT)+CAWZ*CBWZ*DJGK(DT,DU)) ELSEIF(ISUB.EQ.24) THEN C...Angular weight for f + f~ -> Z0 + H0 -> 2 quarks/leptons + H0. WT=((COUP(1,3)*COUP(3,3))**2+(COUP(1,4)*COUP(3,4))**2)* & PKK(1,3)*PKK(2,4)+((COUP(1,3)*COUP(3,4))**2+(COUP(1,4)* & COUP(3,3))**2)*PKK(1,4)*PKK(2,3) WTMAX=(COUP(1,3)**2+COUP(1,4)**2)*(COUP(3,3)**2+COUP(3,4)**2)* & (PKK(1,3)+PKK(1,4))*(PKK(2,3)+PKK(2,4)) ELSEIF(ISUB.EQ.25) THEN C...Angular weight for f + f~ -> W+ + W- -> 4 quarks/leptons. D34=P(IREF(IP,IORD),5)**2 D56=P(IREF(IP,3-IORD),5)**2 DT=PKK(1,3)+PKK(1,4)+D34 DU=PKK(1,5)+PKK(1,6)+D56 CDWW=(COUP(1,3)*SQMZ/(SH-SQMZ)+COUP(1,2))/SH CAWW=CDWW+0.5*(COUP(1,2)+1.)/SNGL(DT) CBWW=CDWW+0.5*(COUP(1,2)-1.)/SNGL(DU) CCWW=COUP(1,4)*SQMZ/(SH-SQMZ)/SH FGK135=ABS(CAWW*FGK(1,2,3,4,5,6)-CBWW*FGK(1,2,5,6,3,4)) FGK253=ABS(FGK(2,1,5,6,3,4)-FGK(2,1,3,4,5,6)) WT=FGK135**2+(CCWW*FGK253)**2 WTMAX=4.*D34*D56*(CAWW**2*DIGK(DT,DU)+CBWW**2*DIGK(DU,DT)-CAWW* & CBWW*DJGK(DT,DU)+CCWW**2*(DIGK(DT,DU)+DIGK(DU,DT)-DJGK(DT,DU))) ELSEIF(ISUB.EQ.26) THEN C...Angular weight for f + f~' -> W+/- + H0 -> 2 quarks/leptons + H0. WT=PKK(1,3)*PKK(2,4) WTMAX=(PKK(1,3)+PKK(1,4))*(PKK(2,3)+PKK(2,4)) ELSEIF(ISUB.EQ.30) THEN C...Angular weight for f + g -> f + Z0 -> f + 2 quarks/leptons. IF(K(ILIN(1),2).GT.0) WT=((COUP(1,3)*COUP(3,3))**2+ & (COUP(1,4)*COUP(3,4))**2)*(PKK(1,4)**2+PKK(3,5)**2)+ & ((COUP(1,3)*COUP(3,4))**2+(COUP(1,4)*COUP(3,3))**2)* & (PKK(1,3)**2+PKK(4,5)**2) IF(K(ILIN(1),2).LT.0) WT=((COUP(1,3)*COUP(3,3))**2+ & (COUP(1,4)*COUP(3,4))**2)*(PKK(1,3)**2+PKK(4,5)**2)+ & ((COUP(1,3)*COUP(3,4))**2+(COUP(1,4)*COUP(3,3))**2)* & (PKK(1,4)**2+PKK(3,5)**2) WTMAX=(COUP(1,3)**2+COUP(1,4)**2)*(COUP(3,3)**2+COUP(3,4)**2)* & ((PKK(1,3)+PKK(1,4))**2+(PKK(3,5)+PKK(4,5))**2) ELSEIF(ISUB.EQ.31) THEN C...Angular weight for f + g -> f' + W+/- -> f' + 2 quarks/leptons. IF(K(ILIN(1),2).GT.0) WT=PKK(1,4)**2+PKK(3,5)**2 IF(K(ILIN(1),2).LT.0) WT=PKK(1,3)**2+PKK(4,5)**2 WTMAX=(PKK(1,3)+PKK(1,4))**2+(PKK(3,5)+PKK(4,5))**2 ELSEIF(ISUB.EQ.141) THEN IF(IP.EQ.1.AND.(KDCY(1).EQ.1.OR.KDCY(1).EQ.2)) THEN C...Angular weight for f + f~ -> gamma*/Z0/Z'0 -> 2 quarks/leptons. EI=KCHG(IABS(MINT(15)),1)/3. AI=SIGN(1.,EI+0.1) VI=AI-4.*EI*XW API=SIGN(1.,EI+0.1) VPI=API-4.*EI*XW EF=KCHG(IABS(KFL1(1)),1)/3. AF=SIGN(1.,EF+0.1) VF=AF-4.*EF*XW APF=SIGN(1.,EF+0.1) VPF=APF-4.*EF*XW GG=1. GZ=1./(8.*XW*(1.-XW))*SH*(SH-SQMZ)/((SH-SQMZ)**2+GZMZ**2) GZP=1./(8.*XW*(1.-XW))*SH*(SH-SQMZP)/((SH-SQMZP)**2+GZMZP**2) ZZ=1./(16.*XW*(1.-XW))**2*SH**2/((SH-SQMZ)**2+GZMZ**2) ZZP=2./(16.*XW*(1.-XW))**2* & SH**2*((SH-SQMZ)*(SH-SQMZP)+GZMZ*GZMZP)/ & (((SH-SQMZ)**2+GZMZ**2)*((SH-SQMZP)**2+GZMZP**2)) ZPZP=1./(16.*XW*(1.-XW))**2*SH**2/((SH-SQMZP)**2+GZMZP**2) IF(MSTP(44).EQ.1) THEN C...Only gamma* production included. GZ=0. GZP=0. ZZ=0. ZZP=0. ZPZP=0. ELSEIF(MSTP(44).EQ.2) THEN C...Only Z0 production included. GG=0. GZ=0. GZP=0. ZZP=0. ZPZP=0. ELSEIF(MSTP(44).EQ.3) THEN C...Only Z'0 production included. GG=0. GZ=0. GZP=0. ZZ=0. ZZP=0. ELSEIF(MSTP(44).EQ.4) THEN C...Only gamma*/Z0 production included. GZP=0. ZZP=0. ZPZP=0. ELSEIF(MSTP(44).EQ.5) THEN C...Only gamma*/Z'0 production included. GZ=0. ZZ=0. ZZP=0. ELSEIF(MSTP(44).EQ.6) THEN C...Only Z0/Z'0 production included. GG=0. GZ=0. GZP=0. ENDIF ASYM=2.*(EI*AI*GZ*EF*AF+EI*API*GZP*EF*APF+4.*VI*AI*ZZ*VF*AF+ & (VI*API+VPI*AI)*ZZP*(VF*APF+VPF*AF)+4.*VPI*API*ZPZP*VPF*APF)/ & (EI**2*GG*EF**2+EI*VI*GZ*EF*VF+EI*VPI*GZP*EF*VPF+ & (VI**2+AI**2)*ZZ*(VF**2+AF**2)+(VI*VPI+AI*API)*ZZP* & (VF*VPF+AF*APF)+(VPI**2+API**2)*ZPZP*(VPF**2+APF**2)) WT=1.+ASYM*CTHE(1)*ISIGN(1,MINT(15)*KFL1(1))+CTHE(1)**2 WTMAX=2.+ABS(ASYM) ELSEIF(IP.EQ.1.AND.KDCY(1).EQ.3) THEN C...Angular weight for f + f~ -> Z' -> W+ + W-. RM1=P(NSD(1)+1,5)**2/SH RM2=P(NSD(1)+2,5)**2/SH CCOS2=-(1./16.)*((1.-RM1-RM2)**2-4.*RM1*RM2)* & (1.-2.*RM1-2.*RM2+RM1**2+RM2**2+10.*RM1*RM2) CFLAT=-CCOS2+0.5*(RM1+RM2)*(1.-2.*RM1-2.*RM2+(RM2-RM1)**2) WT=CFLAT+CCOS2*CTHE(1)**2 WTMAX=CFLAT+MAX(0.,CCOS2) ELSE C...Angular weight for f + f~ -> Z' -> W+ + W- -> 4 quarks/leptons. D34=P(IREF(IP,IORD),5)**2 D56=P(IREF(IP,3-IORD),5)**2 DT=PKK(1,3)+PKK(1,4)+D34 DU=PKK(1,5)+PKK(1,6)+D56 FGK135=ABS(FGK(1,2,3,4,5,6)-FGK(1,2,5,6,3,4)) FGK253=ABS(FGK(2,1,5,6,3,4)-FGK(2,1,3,4,5,6)) WT=(COUP(1,3)*FGK135)**2+(COUP(1,4)*FGK253)**2 WTMAX=4.*D34*D56*(COUP(1,3)**2+COUP(1,4)**2)* & (DIGK(DT,DU)+DIGK(DU,DT)-DJGK(DT,DU)) ENDIF C? ELSEIF(ISUB.EQ.142) THEN C? IF(IP.EQ.1.AND.(KDCY(1).EQ.1.OR.KDCY(1).EQ.2)) THEN C...Angular weight for f + f~' -> W'+/- -> 2 quarks/leptons. C? WT=(1.+CTHE(1)*ISIGN(1,MINT(15)*KFL1(1)))**2 C? WTMAX=4. C? ELSEIF(IP.EQ.1.AND.KDCY(1).EQ.3) THEN C...Angular weight for f + f~' -> W'+/- -> W+/- + Z0. C? RM1=P(NSD(1)+1,5)**2/SH C? RM2=P(NSD(1)+2,5)**2/SH C? CCOS2=-(1./16.)*((1.-RM1-RM2)**2-4.*RM1*RM2)* C? & (1.-2.*RM1-2.*RM2+RM1**2+RM2**2+10.*RM1*RM2) C? CFLAT=-CCOS2+0.5*(RM1+RM2)*(1.-2.*RM1-2.*RM2+(RM2-RM1)**2) C? WT=CFLAT+CCOS2*CTHE(1)**2 C? WTMAX=CFLAT+MAX(0.,CCOS2) C? ELSE C...Angular weight for f + f~' -> W' -> W + Z0 -> 4 quarks/leptons. C? D34=P(IREF(IP,IORD),5)**2 C? D56=P(IREF(IP,3-IORD),5)**2 C? DT=PKK(1,3)+PKK(1,4)+D34 C? DU=PKK(1,5)+PKK(1,6)+D56 C? FGK135=ABS(FGK(1,2,3,4,5,6)-FGK(1,2,5,6,3,4)) C? FGK136=ABS(FGK(1,2,3,4,6,5)-FGK(1,2,6,5,3,4)) C? WT=(COUP(5,3)*FGK135)**2+(COUP(5,4)*FGK136)**2 C? WTMAX=4.*D34*D56*(COUP(5,3)**2+COUP(5,4)**2)* C? & (DIGK(DT,DU)+DIGK(DU,DT)-DJGK(DT,DU)) C? ENDIF C...Obtain correct angular distribution by rejection techniques. ELSE WT=1. WTMAX=1. ENDIF IF(WT.LT.RLU(0)*WTMAX) GOTO 160 C...Construct massive four-vectors using angles chosen. Mark decayed C...resonances, add documentation lines. Shower evolution. DO 270 JT=1,JTMAX IF(KDCY(JT).EQ.0) GOTO 270 ID=IREF(IP,JT) CALL LUDBRB(NSD(JT)+1,NSD(JT)+2,ACOS(CTHE(JT)),PHI(JT), &DBLE(P(ID,1)/P(ID,4)),DBLE(P(ID,2)/P(ID,4)),DBLE(P(ID,3)/P(ID,4))) K(ID,1)=K(ID,1)+10 K(ID,4)=NSD(JT)+1 K(ID,5)=NSD(JT)+2 IDOC=MINT(83)+MINT(4) DO 260 I=NSD(JT)+1,NSD(JT)+2 MINT(4)=MINT(4)+1 I1=MINT(83)+MINT(4) K(I,3)=I1 K(I1,1)=21 K(I1,2)=K(I,2) K(I1,3)=IREF(IP,JT+2) DO 260 J=1,5 260 P(I1,J)=P(I,J) IF(MSTP(71).GE.1.AND.KDCY(JT).EQ.1) CALL LUSHOW(NSD(JT)+1, &NSD(JT)+2,P(ID,5)) C...Check if new resonances were produced. IF(KDCY(JT).NE.3) GOTO 270 NP=NP+1 IREF(NP,1)=NSD(JT)+1 IREF(NP,2)=NSD(JT)+2 IREF(NP,3)=IDOC+1 IREF(NP,4)=IDOC+2 IREF(NP,5)=K(IREF(IP,JT),2) IREF(NP,6)=IREF(IP,JT) 270 CONTINUE C...Fill information for 2 -> 1 -> 2. Loop back if needed. IF(JTMAX.EQ.1.AND.KDCY(1).NE.0) THEN MINT(7)=MINT(83)+6+2*ISET(ISUB) MINT(8)=MINT(83)+7+2*ISET(ISUB) MINT(25)=KFL1(1) MINT(26)=KFL2(1) VINT(23)=CTHE(1) RM3=P(N-1,5)**2/SH RM4=P(N,5)**2/SH BE34=SQRT(MAX(0.,(1.-RM3-RM4)**2-4.*RM3*RM4)) VINT(45)=-0.5*SH*(1.-RM3-RM4-BE34*CTHE(1)) VINT(46)=-0.5*SH*(1.-RM3-RM4+BE34*CTHE(1)) VINT(48)=0.25*SH*BE34**2*MAX(0.,1.-CTHE(1)**2) VINT(47)=SQRT(VINT(48)) PARI(15)=VINT(45) PARI(16)=VINT(46) PARI(17)=VINT(47) PARI(18)=VINT(48) PARI(41)=VINT(23) PARI(65)=2.*PARI(17) ENDIF 280 IF(IP.LT.NP) GOTO 100 RETURN END C********************************************************************* SUBROUTINE PYDIFF C...Handles diffractive and elastic scattering. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) SAVE /LUJETS/,/LUDAT1/ SAVE /PYPARS/,/PYINT1/ C...Reset K, P and V vectors. Store incoming particles. DO 100 JT=1,MSTP(126)+10 I=MINT(83)+JT DO 100 J=1,5 K(I,J)=0 P(I,J)=0. 100 V(I,J)=0. N=MINT(84) MINT(3)=0 MINT(21)=0 MINT(22)=0 MINT(23)=0 MINT(24)=0 MINT(4)=4 DO 110 JT=1,2 I=MINT(83)+JT K(I,1)=21 K(I,2)=MINT(10+JT) P(I,5)=VINT(2+JT) P(I,3)=VINT(5)*(-1)**(JT+1) 110 P(I,4)=SQRT(P(I,3)**2+P(I,5)**2) MINT(6)=2 C...Subprocess; kinematics. ISUB=MINT(1) SQLAM=(VINT(2)-VINT(63)-VINT(64))**2-4.*VINT(63)*VINT(64) PZ=SQRT(SQLAM)/(2.*VINT(1)) DO 150 JT=1,2 I=MINT(83)+JT PE=(VINT(2)+VINT(62+JT)-VINT(65-JT))/(2.*VINT(1)) C...Elastically scattered particle. IF(MINT(16+JT).LE.0) THEN N=N+1 K(N,1)=1 K(N,2)=K(I,2) K(N,3)=I+2 P(N,3)=PZ*(-1)**(JT+1) P(N,4)=PE P(N,5)=P(I,5) C...Diffracted particle: valence quark kicked out. ELSEIF(MSTP(101).EQ.1) THEN N=N+2 K(N-1,1)=2 K(N,1)=1 K(N-1,3)=I+2 K(N,3)=I+2 CALL PYSPLI(K(I,2),21,K(N,2),K(N-1,2)) P(N-1,5)=ULMASS(K(N-1,2)) P(N,5)=ULMASS(K(N,2)) SQLAM=(VINT(62+JT)-P(N-1,5)**2-P(N,5)**2)**2- & 4.*P(N-1,5)**2*P(N,5)**2 P(N-1,3)=(PE*SQRT(SQLAM)+PZ*(VINT(62+JT)+P(N-1,5)**2- & P(N,5)**2))/(2.*VINT(62+JT))*(-1)**(JT+1) P(N-1,4)=SQRT(P(N-1,3)**2+P(N-1,5)**2) P(N,3)=PZ*(-1)**(JT+1)-P(N-1,3) P(N,4)=SQRT(P(N,3)**2+P(N,5)**2) C...Diffracted particle: gluon kicked out. ELSE N=N+3 K(N-2,1)=2 K(N-1,1)=2 K(N,1)=1 K(N-2,3)=I+2 K(N-1,3)=I+2 K(N,3)=I+2 CALL PYSPLI(K(I,2),21,K(N,2),K(N-2,2)) K(N-1,2)=21 P(N-2,5)=ULMASS(K(N-2,2)) P(N-1,5)=0. P(N,5)=ULMASS(K(N,2)) C...Energy distribution for particle into two jets. 120 IMB=1 IF(MOD(K(I,2)/1000,10).NE.0) IMB=2 CHIK=PARP(92+2*IMB) IF(MSTP(92).LE.1) THEN IF(IMB.EQ.1) CHI=RLU(0) IF(IMB.EQ.2) CHI=1.-SQRT(RLU(0)) ELSEIF(MSTP(92).EQ.2) THEN CHI=1.-RLU(0)**(1./(1.+CHIK)) ELSEIF(MSTP(92).EQ.3) THEN CUT=2.*0.3/VINT(1) 130 CHI=RLU(0)**2 IF((CHI**2/(CHI**2+CUT**2))**0.25*(1.-CHI)**CHIK.LT. & RLU(0)) GOTO 130 ELSE CUT=2.*0.3/VINT(1) CUTR=(1.+SQRT(1.+CUT**2))/CUT 140 CHIR=CUT*CUTR**RLU(0) CHI=(CHIR**2-CUT**2)/(2.*CHIR) IF((1.-CHI)**CHIK.LT.RLU(0)) GOTO 140 ENDIF IF(CHI.LT.P(N,5)**2/VINT(62+JT).OR.CHI.GT.1.-P(N-2,5)**2/ & VINT(62+JT)) GOTO 120 SQM=P(N-2,5)**2/(1.-CHI)+P(N,5)**2/CHI IF((SQRT(SQM)+PARJ(32))**2.GE.VINT(62+JT)) GOTO 120 PZI=(PE*(VINT(62+JT)-SQM)+PZ*(VINT(62+JT)+SQM))/ & (2.*VINT(62+JT)) PEI=SQRT(PZI**2+SQM) PQQP=(1.-CHI)*(PEI+PZI) P(N-2,3)=0.5*(PQQP-P(N-2,5)**2/PQQP)*(-1)**(JT+1) P(N-2,4)=SQRT(P(N-2,3)**2+P(N-2,5)**2) P(N-1,3)=(PZ-PZI)*(-1)**(JT+1) P(N-1,4)=ABS(P(N-1,3)) P(N,3)=PZI*(-1)**(JT+1)-P(N-2,3) P(N,4)=SQRT(P(N,3)**2+P(N,5)**2) ENDIF C...Documentation lines. K(I+2,1)=21 IF(MINT(16+JT).EQ.0) K(I+2,2)=MINT(10+JT) IF(MINT(16+JT).NE.0) K(I+2,2)=10*(MINT(10+JT)/10) K(I+2,3)=I P(I+2,3)=PZ*(-1)**(JT+1) P(I+2,4)=PE P(I+2,5)=SQRT(VINT(62+JT)) 150 CONTINUE C...Rotate outgoing partons/particles using cos(theta). CALL LUDBRB(MINT(83)+3,N,ACOS(VINT(23)),VINT(24),0D0,0D0,0D0) RETURN END C********************************************************************* SUBROUTINE PYFRAM(IFRAME) C...Performs transformations between different coordinate frames. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) SAVE /LUDAT1/ SAVE /PYPARS/,/PYINT1/ IF(IFRAME.LT.1.OR.IFRAME.GT.2) THEN WRITE(MSTU(11),1000) IFRAME,MINT(6) RETURN ENDIF IF(IFRAME.EQ.MINT(6)) RETURN IF(MINT(6).EQ.1) THEN C...Transform from fixed target or user specified frame to C...CM-frame of incoming particles. CALL LUROBO(0.,0.,-VINT(8),-VINT(9),-VINT(10)) CALL LUROBO(0.,-VINT(7),0.,0.,0.) CALL LUROBO(-VINT(6),0.,0.,0.,0.) MINT(6)=2 ELSE C...Transform from particle CM-frame to fixed target or user specified C...frame. CALL LUROBO(VINT(6),VINT(7),VINT(8),VINT(9),VINT(10)) MINT(6)=1 ENDIF MSTI(6)=MINT(6) 1000 FORMAT(1X,'Error: illegal values in subroutine PYFRAM.',1X, &'No transformation performed.'/1X,'IFRAME =',1X,I5,'; MINT(6) =', &1X,I5) RETURN END C********************************************************************* SUBROUTINE PYWIDT(KFLR,RMAS,WDTP,WDTE) C...Calculates full and partial widths of resonances. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYPARS/,/PYINT1/,/PYINT4/ DIMENSION WDTP(0:40),WDTE(0:40,0:5),SUMSTR(2) C...Some common constants. KFLA=IABS(KFLR) SQM=RMAS**2 AS=ULALPS(SQM) AEM=PARU(101) XW=PARU(102) RADC=1.+AS/PARU(1) C...Reset width information. DO 100 I=0,40 WDTP(I)=0. DO 100 J=0,5 100 WDTE(I,J)=0. IF(KFLA.EQ.21) THEN C...QCD: DO 110 I=1,MDCY(21,3) IDC=I+MDCY(21,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 110 IF(I.LE.8) THEN C...QCD -> q + q~ WDTP(I)=(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) WID2=1. ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) ENDIF 110 CONTINUE ELSEIF(KFLA.EQ.23) THEN C...Z0: IF(MINT(61).EQ.1) THEN EI=KCHG(IABS(MINT(15)),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW SQMZ=PMAS(23,1)**2 GZMZ=PMAS(23,2)*PMAS(23,1) GGI=EI**2 GZI=EI*VI/(8.*XW*(1.-XW))*SQM*(SQM-SQMZ)/ & ((SQM-SQMZ)**2+GZMZ**2) ZZI=(VI**2+AI**2)/(16.*XW*(1.-XW))**2*SQM**2/ & ((SQM-SQMZ)**2+GZMZ**2) IF(MSTP(43).EQ.1) THEN C...Only gamma* production included GZI=0. ZZI=0. ELSEIF(MSTP(43).EQ.2) THEN C...Only Z0 production included GGI=0. GZI=0. ENDIF ELSEIF(MINT(61).EQ.2) THEN VINT(111)=0. VINT(112)=0. VINT(114)=0. ENDIF DO 120 I=1,MDCY(23,3) IDC=I+MDCY(23,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 120 IF(I.LE.8) THEN C...Z0 -> q + q~ EF=KCHG(I,1)/3. AF=SIGN(1.,EF+0.1) VF=AF-4.*EF*XW IF(MINT(61).EQ.0) THEN WDTP(I)=3.*(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ELSEIF(MINT(61).EQ.1) THEN WDTP(I)=3.*((GGI*EF**2+GZI*EF*VF+ZZI*VF**2)* & (1.+2.*RM1)+ZZI*AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ELSEIF(MINT(61).EQ.2) THEN GGF=3.*EF**2*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1))*RADC GZF=3.*EF*VF*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1))*RADC ZZF=3.*(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ENDIF WID2=1. ELSEIF(I.LE.16) THEN C...Z0 -> l+ + l-, nu + nu~ EF=KCHG(I+2,1)/3. AF=SIGN(1.,EF+0.1) VF=AF-4.*EF*XW WDTP(I)=(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) IF(MINT(61).EQ.0) THEN WDTP(I)=(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ELSEIF(MINT(61).EQ.1) THEN WDTP(I)=((GGI*EF**2+GZI*EF*VF+ZZI*VF**2)* & (1.+2.*RM1)+ZZI*AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ELSEIF(MINT(61).EQ.2) THEN GGF=EF**2*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) GZF=EF*VF*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) ZZF=(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ENDIF WID2=1. ELSE C...Z0 -> H+ + H- CF=2.*(1.-2.*XW) IF(MINT(61).EQ.0) THEN WDTP(I)=0.25*CF**2*(1.-4.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) ELSEIF(MINT(61).EQ.1) THEN WDTP(I)=0.25*(GGI+GZI*CF+ZZI*CF**2)*(1.-4.*RM1)* & SQRT(MAX(0.,1.-4.*RM1)) ELSEIF(MINT(61).EQ.2) THEN GGF=0.25*(1.-4.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) GZF=0.25*CF*(1.-4.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) ZZF=0.25*CF**2*(1.-4.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) ENDIF WID2=WIDS(37,1) ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) VINT(111)=VINT(111)+GGF*WID2 VINT(112)=VINT(112)+GZF*WID2 VINT(114)=VINT(114)+ZZF*WID2 ENDIF 120 CONTINUE IF(MSTP(43).EQ.1) THEN C...Only gamma* production included VINT(112)=0. VINT(114)=0. ELSEIF(MSTP(43).EQ.2) THEN C...Only Z0 production included VINT(111)=0. VINT(112)=0. ENDIF ELSEIF(KFLA.EQ.24) THEN C...W+/-: DO 130 I=1,MDCY(24,3) IDC=I+MDCY(24,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 130 IF(I.LE.16) THEN C...W+/- -> q + q~' WDTP(I)=3.*(2.-RM1-RM2-(RM1-RM2)**2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2))* & VCKM((I-1)/4+1,MOD(I-1,4)+1)*RADC WID2=1. ELSE C...W+/- -> l+/- + nu WDTP(I)=(2.-RM1-RM2-(RM1-RM2)**2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2)) WID2=1. ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) ENDIF 130 CONTINUE ELSEIF(KFLA.EQ.25) THEN C...H0: DO 170 I=1,MDCY(25,3) IDC=I+MDCY(25,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(MDME(IDC,1).LT.0) GOTO 170 IF(SQRT(RM1)+SQRT(RM2).GT.1..AND.I.LE.MDCY(25,3)-2) GOTO 170 IF(I.LE.8) THEN C...H0 -> q + q~ WDTP(I)=3.*RM1*(1.-4.*RM1)*SQRT(MAX(0.,1.-4.*RM1))*RADC WID2=1. ELSEIF(I.LE.12) THEN C...H0 -> l+ + l- WDTP(I)=RM1*(1.-4.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) WID2=1. ELSEIF(I.EQ.13) THEN C...H0 -> g + g; quark loop contribution only ETARE=0. ETAIM=0. DO 140 J=1,2*MSTP(1) EPS=(2.*PMAS(J,1)/RMAS)**2 IF(EPS.LE.1.) THEN IF(EPS.GT.1.E-4) THEN ROOT=SQRT(1.-EPS) RLN=LOG((1.+ROOT)/(1.-ROOT)) ELSE RLN=LOG(4./EPS-2.) ENDIF PHIRE=0.25*(RLN**2-PARU(1)**2) PHIIM=0.5*PARU(1)*RLN ELSE PHIRE=-(ASIN(1./SQRT(EPS)))**2 PHIIM=0. ENDIF ETARE=ETARE+0.5*EPS*(1.+(EPS-1.)*PHIRE) ETAIM=ETAIM+0.5*EPS*(EPS-1.)*PHIIM 140 CONTINUE ETA2=ETARE**2+ETAIM**2 WDTP(I)=(AS/PARU(1))**2*ETA2 WID2=1. ELSEIF(I.EQ.14) THEN C...H0 -> gamma + gamma; quark, charged lepton and W loop contributions ETARE=0. ETAIM=0. DO 150 J=1,3*MSTP(1)+1 IF(J.LE.2*MSTP(1)) THEN EJ=KCHG(J,1)/3. EPS=(2.*PMAS(J,1)/RMAS)**2 ELSEIF(J.LE.3*MSTP(1)) THEN JL=2*(J-2*MSTP(1))-1 EJ=KCHG(10+JL,1)/3. EPS=(2.*PMAS(10+JL,1)/RMAS)**2 ELSE EPS=(2.*PMAS(24,1)/RMAS)**2 ENDIF IF(EPS.LE.1.) THEN IF(EPS.GT.1.E-4) THEN ROOT=SQRT(1.-EPS) RLN=LOG((1.+ROOT)/(1.-ROOT)) ELSE RLN=LOG(4./EPS-2.) ENDIF PHIRE=0.25*(RLN**2-PARU(1)**2) PHIIM=0.5*PARU(1)*RLN ELSE PHIRE=-(ASIN(1./SQRT(EPS)))**2 PHIIM=0. ENDIF IF(J.LE.2*MSTP(1)) THEN ETARE=ETARE+0.5*3.*EJ**2*EPS*(1.+(EPS-1.)*PHIRE) ETAIM=ETAIM+0.5*3.*EJ**2*EPS*(EPS-1.)*PHIIM ELSEIF(J.LE.3*MSTP(1)) THEN ETARE=ETARE+0.5*EJ**2*EPS*(1.+(EPS-1.)*PHIRE) ETAIM=ETAIM+0.5*EJ**2*EPS*(EPS-1.)*PHIIM ELSE ETARE=ETARE-0.5-0.75*EPS*(1.+(EPS-2.)*PHIRE) ETAIM=ETAIM+0.75*EPS*(EPS-2.)*PHIIM ENDIF 150 CONTINUE ETA2=ETARE**2+ETAIM**2 WDTP(I)=(AEM/PARU(1))**2*0.5*ETA2 WID2=1. ELSEIF(I.EQ.15) THEN C...H0 -> gamma + Z0; quark, charged lepton and W loop contributions ETARE=0. ETAIM=0. DO 160 J=1,3*MSTP(1)+1 IF(J.LE.2*MSTP(1)) THEN EJ=KCHG(J,1)/3. AJ=SIGN(1.,EJ+0.1) VJ=AJ-4.*EJ*XW EPS=(2.*PMAS(J,1)/RMAS)**2 EPSP=(2.*PMAS(J,1)/PMAS(23,1))**2 ELSEIF(J.LE.3*MSTP(1)) THEN JL=2*(J-2*MSTP(1))-1 EJ=KCHG(10+JL,1)/3. AJ=SIGN(1.,EJ+0.1) VJ=AJ-4.*EJ*XW EPS=(2.*PMAS(10+JL,1)/RMAS)**2 EPSP=(2.*PMAS(10+JL,1)/PMAS(23,1))**2 ELSE EPS=(2.*PMAS(24,1)/RMAS)**2 EPSP=(2.*PMAS(24,1)/PMAS(23,1))**2 ENDIF IF(EPS.LE.1.) THEN ROOT=SQRT(1.-EPS) IF(EPS.GT.1.E-4) THEN RLN=LOG((1.+ROOT)/(1.-ROOT)) ELSE RLN=LOG(4./EPS-2.) ENDIF PHIRE=0.25*(RLN**2-PARU(1)**2) PHIIM=0.5*PARU(1)*RLN PSIRE=-(1.+0.5*ROOT*RLN) PSIIM=0.5*PARU(1)*ROOT ELSE PHIRE=-(ASIN(1./SQRT(EPS)))**2 PHIIM=0. PSIRE=-(1.+SQRT(EPS-1.)*ASIN(1./SQRT(EPS))) PSIIM=0. ENDIF IF(EPSP.LE.1.) THEN ROOT=SQRT(1.-EPSP) IF(EPSP.GT.1.E-4) THEN RLN=LOG((1.+ROOT)/(1.-ROOT)) ELSE RLN=LOG(4./EPSP-2.) ENDIF PHIREP=0.25*(RLN**2-PARU(1)**2) PHIIMP=0.5*PARU(1)*RLN PSIREP=-(1.+0.5*ROOT*RLN) PSIIMP=0.5*PARU(1)*ROOT ELSE PHIREP=-(ASIN(1./SQRT(EPSP)))**2 PHIIMP=0. PSIREP=-(1.+SQRT(EPSP-1.)*ASIN(1./SQRT(EPSP))) PSIIMP=0. ENDIF FXYRE=EPS*EPSP/(8.*(EPS-EPSP))*(1.-EPS*EPSP/(EPS-EPSP)*(PHIRE- & PHIREP)+2.*EPS/(EPS-EPSP)*(PSIRE-PSIREP)) FXYIM=EPS*EPSP/(8.*(EPS-EPSP))*(-EPS*EPSP/(EPS-EPSP)*(PHIIM- & PHIIMP)+2.*EPS/(EPS-EPSP)*(PSIIM-PSIIMP)) F1RE=EPS*EPSP/(2.*(EPS-EPSP))*(PHIRE-PHIREP) F1IM=EPS*EPSP/(2.*(EPS-EPSP))*(PHIIM-PHIIMP) IF(J.LE.2*MSTP(1)) THEN ETARE=ETARE-3.*EJ*VJ*(FXYRE-0.25*F1RE) ETAIM=ETAIM-3.*EJ*VJ*(FXYIM-0.25*F1IM) ELSEIF(J.LE.3*MSTP(1)) THEN ETARE=ETARE-EJ*VJ*(FXYRE-0.25*F1RE) ETAIM=ETAIM-EJ*VJ*(FXYIM-0.25*F1IM) ELSE ETARE=ETARE-SQRT(1.-XW)*(((1.+2./EPS)*XW/SQRT(1.-XW)- & (5.+2./EPS))*FXYRE+(3.-XW/SQRT(1.-XW))*F1RE) ETAIM=ETAIM-SQRT(1.-XW)*(((1.+2./EPS)*XW/SQRT(1.-XW)- & (5.+2./EPS))*FXYIM+(3.-XW/SQRT(1.-XW))*F1IM) ENDIF 160 CONTINUE ETA2=ETARE**2+ETAIM**2 WDTP(I)=(AEM/PARU(1))**2*(1.-(PMAS(23,1)/RMAS)**2)**3/XW*ETA2 WID2=WIDS(23,2) ELSEIF(RM1.LT.0.25) THEN C...H0 -> Z0 + Z0, W+ + W- WDTP(I)=(1.-4.*RM1+12.*RM1**2)*SQRT(MAX(0.,1.-4.*RM1))/ & (2.*(18-I)) WID2=WIDS(7+I,1) ELSEIF(MSTP(42).GE.1.AND.RM1.LT.1.) THEN C...H0 -> Z0* + Z0, W+* + W- (one boson off shell, approximate!) IF(MINT(61).EQ.1) THEN KFLSTR=IABS(KFDP(IDC,1)) PMSTR=PMAS(KFLSTR,1) GASTR=PMAS(KFLSTR,2) PMLSTR=MAX(0.,CKIN(41)) PMUSTR=RMAS-PMSTR IF(CKIN(42).GT.CKIN(41)) PMUSTR=MIN(RMAS-PMSTR,CKIN(42)) ATLSTR=ATAN((PMLSTR**2-PMSTR**2)/(PMSTR*GASTR)) ATUSTR=ATAN((PMUSTR**2-PMSTR**2)/(PMSTR*GASTR)) NSTR=100 SWWSTR=0. DO 165 ISTR=1,NSTR XSTR=(2.*ISTR-1.)/(2.*NSTR) PM2STR=PMSTR**2+PMSTR*GASTR*TAN(ATLSTR+XSTR*(ATUSTR-ATLSTR)) RM2STR=MIN(PMUSTR**2,MAX(PMLSTR**2,PM2STR))/RMAS**2 WTSTR=((1.-RM1-RM2STR)**2+8.*RM1*RM2STR)* & SQRT(MAX(0.,(1.-RM1-RM2STR)**2-4.*RM1*RM2STR)) 165 SWWSTR=SWWSTR+WTSTR SUMSTR(I-15)=2.*(ATUSTR-ATLSTR)/3.1416*(SWWSTR/NSTR)/ & (2.*(18-I)) ENDIF WDTP(I)=SUMSTR(I-15) WID2=WIDS(7+I,1) ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) ENDIF 170 CONTINUE ELSEIF(KFLA.EQ.32) THEN C...Z'0: IF(MINT(61).EQ.1) THEN EI=KCHG(IABS(MINT(15)),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW SQMZ=PMAS(23,1)**2 GZMZ=PMAS(23,2)*PMAS(23,1) API=SIGN(1.,EI) VPI=API-4.*EI*XW SQMZP=PMAS(32,1)**2 GZPMZP=PMAS(32,2)*PMAS(32,1) GGI=EI**2 GZI=EI*VI/(8.*XW*(1.-XW))*SQM*(SQM-SQMZ)/ & ((SQM-SQMZ)**2+GZMZ**2) GZPI=EI*VPI/(8.*XW*(1.-XW))*SQM*(SQM-SQMZP)/ & ((SQM-SQMZP)**2+GZPMZP**2) ZZI=(VI**2+AI**2)/(16.*XW*(1.-XW))**2*SQM**2/ & ((SQM-SQMZ)**2+GZMZ**2) ZZPI=2.*(VI*VPI+AI*API)/(16.*XW*(1.-XW))**2* & SQM**2*((SQM-SQMZ)*(SQM-SQMZP)+GZMZ*GZPMZP)/ & (((SQM-SQMZ)**2+GZMZ**2)*((SQM-SQMZP)**2+GZPMZP**2)) ZPZPI=(VPI**2+API**2)/(16.*XW*(1.-XW))**2*SQM**2/ & ((SQM-SQMZP)**2+GZPMZP**2) IF(MSTP(44).EQ.1) THEN C...Only gamma* production included GZI=0. GZPI=0. ZZI=0. ZZPI=0. ZPZPI=0. ELSEIF(MSTP(44).EQ.2) THEN C...Only Z0 production included GGI=0. GZI=0. GZPI=0. ZZPI=0. ZPZPI=0. ELSEIF(MSTP(44).EQ.3) THEN C...Only Z'0 production included GGI=0. GZI=0. GZPI=0. ZZI=0. ZZPI=0. ELSEIF(MSTP(44).EQ.4) THEN C...Only gamma*/Z0 production included GZPI=0. ZZPI=0. ZPZPI=0. ELSEIF(MSTP(44).EQ.5) THEN C...Only gamma*/Z'0 production included GZI=0. ZZI=0. ZZPI=0. ELSEIF(MSTP(44).EQ.6) THEN C...Only Z0/Z'0 production included GGI=0. GZI=0. GZPI=0. ENDIF ELSEIF(MINT(61).EQ.2) THEN VINT(111)=0. VINT(112)=0. VINT(113)=0. VINT(114)=0. VINT(115)=0. VINT(116)=0. ENDIF DO 180 I=1,MDCY(32,3) IDC=I+MDCY(32,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 180 IF(I.LE.8) THEN C...Z'0 -> q + q~ EF=KCHG(I,1)/3. AF=SIGN(1.,EF+0.1) VF=AF-4.*EF*XW APF=SIGN(1.,EF+0.1) VPF=APF-4.*EF*XW IF(MINT(61).EQ.0) THEN WDTP(I)=3.*(VPF**2*(1.+2.*RM1)+APF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ELSEIF(MINT(61).EQ.1) THEN WDTP(I)=3.*((GGI*EF**2+GZI*EF*VF+GZPI*EF*VPF+ZZI*VF**2+ & ZZPI*VF*VPF+ZPZPI*VPF**2)*(1.+2.*RM1)+(ZZI*AF**2+ & ZZPI*AF*APF+ZPZPI*APF**2)*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ELSEIF(MINT(61).EQ.2) THEN GGF=3.*EF**2*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1))*RADC GZF=3.*EF*VF*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1))*RADC GZPF=3.*EF*VPF*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1))*RADC ZZF=3.*(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ZZPF=3.*(VF*VPF*(1.+2.*RM1)+AF*APF*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ZPZPF=3.*(VPF**2*(1.+2.*RM1)+APF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1))*RADC ENDIF WID2=1. ELSEIF(I.LE.16) THEN C...Z'0 -> l+ + l-, nu + nu~ EF=KCHG(I+2,1)/3. AF=SIGN(1.,EF+0.1) VF=AF-4.*EF*XW APF=SIGN(1.,EF+0.1) VPF=APF-4.*EF*XW IF(MINT(61).EQ.0) THEN WDTP(I)=(VPF**2*(1.+2.*RM1)+APF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ELSEIF(MINT(61).EQ.1) THEN WDTP(I)=((GGI*EF**2+GZI*EF*VF+GZPI*EF*VPF+ZZI*VF**2+ & ZZPI*VF*VPF+ZPZPI*VPF**2)*(1.+2.*RM1)+(ZZI*AF**2+ & ZZPI*AF*APF+ZPZPI*APF**2)*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ELSEIF(MINT(61).EQ.2) THEN GGF=EF**2*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) GZF=EF*VF*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) GZPF=EF*VPF*(1.+2.*RM1)*SQRT(MAX(0.,1.-4.*RM1)) ZZF=(VF**2*(1.+2.*RM1)+AF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ZZPF=(VF*VPF*(1.+2.*RM1)+AF*APF*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ZPZPF=(VPF**2*(1.+2.*RM1)+APF**2*(1.-4.*RM1))* & SQRT(MAX(0.,1.-4.*RM1)) ENDIF WID2=1. ELSE C...Z' -> W+ + W- WDTPZP=PARU(143)**2*(1.-XW)**2* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2))**3* & (1.+10.*RM1+10.*RM2+RM1**2+RM2**2+10.*RM1*RM2) IF(MINT(61).EQ.0) THEN WDTP(I)=WDTPZP ELSEIF(MINT(61).EQ.1) THEN WDTP(I)=ZPZPI*WDTPZP ELSEIF(MINT(61).EQ.2) THEN GGF=0. GZF=0. GZPF=0. ZZF=0. ZZPF=0. ZPZPF=WDTPZP ENDIF WID2=WIDS(24,1) ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) VINT(111)=VINT(111)+GGF VINT(112)=VINT(112)+GZF VINT(113)=VINT(113)+GZPF VINT(114)=VINT(114)+ZZF VINT(115)=VINT(115)+ZZPF VINT(116)=VINT(116)+ZPZPF ENDIF 180 CONTINUE IF(MSTP(44).EQ.1) THEN C...Only gamma* production included VINT(112)=0. VINT(113)=0. VINT(114)=0. VINT(115)=0. VINT(116)=0. ELSEIF(MSTP(44).EQ.2) THEN C...Only Z0 production included VINT(111)=0. VINT(112)=0. VINT(113)=0. VINT(115)=0. VINT(116)=0. ELSEIF(MSTP(44).EQ.3) THEN C...Only Z'0 production included VINT(111)=0. VINT(112)=0. VINT(113)=0. VINT(114)=0. VINT(115)=0. ELSEIF(MSTP(44).EQ.4) THEN C...Only gamma*/Z0 production included VINT(113)=0. VINT(115)=0. VINT(116)=0. ELSEIF(MSTP(44).EQ.5) THEN C...Only gamma*/Z'0 production included VINT(112)=0. VINT(114)=0. VINT(115)=0. ELSEIF(MSTP(44).EQ.6) THEN C...Only Z0/Z'0 production included VINT(111)=0. VINT(112)=0. VINT(113)=0. ENDIF ELSEIF(KFLA.EQ.34) THEN C...W'+/-: DO 190 I=1,MDCY(34,3) IDC=I+MDCY(34,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 190 IF(I.LE.16) THEN C...W'+/- -> q + q~' WDTP(I)=PARU(141)**2*3.*(2.-RM1-RM2-(RM1-RM2)**2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2))* & VCKM((I-1)/4+1,MOD(I-1,4)+1)*RADC WID2=1. ELSEIF(I.LE.20) THEN C...W'+/- -> l+/- + nu WDTP(I)=PARU(142)**2*(2.-RM1-RM2-(RM1-RM2)**2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2)) WID2=1. ELSE C...W'+/- -> W+/- + Z0 WDTP(I)=PARU(143)**2*0.5*(1.-XW)*(RM1/RM2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2))**3* & (1.+10.*RM1+10.*RM2+RM1**2+RM2**2+10.*RM1*RM2) IF(KFLR.GT.0) WID2=WIDS(24,2)*WIDS(23,2) IF(KFLR.LT.0) WID2=WIDS(24,3)*WIDS(23,2) ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) ENDIF 190 CONTINUE ELSEIF(KFLA.EQ.37) THEN C...H+/-: DO 200 I=1,MDCY(37,3) IDC=I+MDCY(37,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 200 IF(I.LE.4) THEN C...H+/- -> q + q~' WDTP(I)=3.*((RM1*PARU(121)+RM2/PARU(121))* & (1.-RM1-RM2)-4.*RM1*RM2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2))*RADC WID2=1. ELSE C...H+/- -> l+/- + nu WDTP(I)=((RM1*PARU(121)+RM2/PARU(121))* & (1.-RM1-RM2)-4.*RM1*RM2)* & SQRT(MAX(0.,(1.-RM1-RM2)**2-4.*RM1*RM2)) WID2=1. ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) ENDIF 200 CONTINUE ELSEIF(KFLA.EQ.40) THEN C...R: DO 210 I=1,MDCY(40,3) IDC=I+MDCY(40,2)-1 RM1=(PMAS(IABS(KFDP(IDC,1)),1)/RMAS)**2 RM2=(PMAS(IABS(KFDP(IDC,2)),1)/RMAS)**2 IF(SQRT(RM1)+SQRT(RM2).GT.1..OR.MDME(IDC,1).LT.0) GOTO 210 IF(I.LE.4) THEN C...R -> q + q~' WDTP(I)=3.*RADC WID2=1. ELSE C...R -> l+ + l'- WDTP(I)=1. WID2=1. ENDIF WDTP(0)=WDTP(0)+WDTP(I) IF(MDME(IDC,1).GT.0) THEN WDTE(I,MDME(IDC,1))=WDTP(I)*WID2 WDTE(0,MDME(IDC,1))=WDTE(0,MDME(IDC,1))+WDTE(I,MDME(IDC,1)) WDTE(I,0)=WDTE(I,MDME(IDC,1)) WDTE(0,0)=WDTE(0,0)+WDTE(I,0) ENDIF 210 CONTINUE ENDIF MINT(61)=0 RETURN END C*********************************************************************** SUBROUTINE PYKLIM(ILIM) C...Checks generated variables against pre-set kinematical limits; C...also calculates limits on variables used in generation. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/ C...Common kinematical expressions. ISUB=MINT(1) IF(ISUB.EQ.96) GOTO 110 SQM3=VINT(63) SQM4=VINT(64) IF(ILIM.NE.1) THEN TAU=VINT(21) RM3=SQM3/(TAU*VINT(2)) RM4=SQM4/(TAU*VINT(2)) BE34=SQRT((1.-RM3-RM4)**2-4.*RM3*RM4) ENDIF PTHMIN=CKIN(3) IF(MIN(SQM3,SQM4).LT.CKIN(6)**2) PTHMIN=MAX(CKIN(3),CKIN(5)) IF(ILIM.EQ.0) THEN C...Check generated values of tau, y*, cos(theta-hat), and tau' against C...pre-set kinematical limits. YST=VINT(22) CTH=VINT(23) TAUP=VINT(26) IF(ISET(ISUB).LE.2) THEN X1=SQRT(TAU)*EXP(YST) X2=SQRT(TAU)*EXP(-YST) ELSE X1=SQRT(TAUP)*EXP(YST) X2=SQRT(TAUP)*EXP(-YST) ENDIF XF=X1-X2 IF(TAU*VINT(2).LT.CKIN(1)**2) MINT(51)=1 IF(CKIN(2).GE.0..AND.TAU*VINT(2).GT.CKIN(2)**2) MINT(51)=1 IF(X1.LT.CKIN(21).OR.X1.GT.CKIN(22)) MINT(51)=1 IF(X2.LT.CKIN(23).OR.X2.GT.CKIN(24)) MINT(51)=1 IF(XF.LT.CKIN(25).OR.XF.GT.CKIN(26)) MINT(51)=1 IF(YST.LT.CKIN(7).OR.YST.GT.CKIN(8)) MINT(51)=1 IF(ISET(ISUB).EQ.2.OR.ISET(ISUB).EQ.4) THEN PTH=0.5*BE34*SQRT(TAU*VINT(2)*(1.-CTH**2)) EXPY3=MAX(1.E-10,(1.+RM3-RM4+BE34*CTH)/ & MAX(1.E-10,(1.+RM3-RM4-BE34*CTH))) EXPY4=MAX(1.E-10,(1.-RM3+RM4-BE34*CTH)/ & MAX(1.E-10,(1.-RM3+RM4+BE34*CTH))) Y3=YST+0.5*LOG(EXPY3) Y4=YST+0.5*LOG(EXPY4) YLARGE=MAX(Y3,Y4) YSMALL=MIN(Y3,Y4) ETALAR=10. ETASMA=-10. STH=SQRT(1.-CTH**2) IF(STH.LT.1.E-6) GOTO 100 EXPET3=((1.+RM3-RM4)*SINH(YST)+BE34*COSH(YST)*CTH+ & SQRT(((1.+RM3-RM4)*COSH(YST)+BE34*SINH(YST)*CTH)**2-4.*RM3))/ & (BE34*STH) EXPET4=((1.-RM3+RM4)*SINH(YST)-BE34*COSH(YST)*CTH+ & SQRT(((1.-RM3+RM4)*COSH(YST)-BE34*SINH(YST)*CTH)**2-4.*RM4))/ & (BE34*STH) ETA3=LOG(MIN(1.E10,MAX(1.E-10,EXPET3))) ETA4=LOG(MIN(1.E10,MAX(1.E-10,EXPET4))) ETALAR=MAX(ETA3,ETA4) ETASMA=MIN(ETA3,ETA4) 100 CTS3=((1.+RM3-RM4)*SINH(YST)+BE34*COSH(YST)*CTH)/ & SQRT(((1.+RM3-RM4)*COSH(YST)+BE34*SINH(YST)*CTH)**2-4.*RM3) CTS4=((1.-RM3+RM4)*SINH(YST)-BE34*COSH(YST)*CTH)/ & SQRT(((1.-RM3+RM4)*COSH(YST)-BE34*SINH(YST)*CTH)**2-4.*RM4) CTSLAR=MAX(CTS3,CTS4) CTSSMA=MIN(CTS3,CTS4) IF(PTH.LT.PTHMIN) MINT(51)=1 IF(CKIN(4).GE.0..AND.PTH.GT.CKIN(4)) MINT(51)=1 IF(YLARGE.LT.CKIN(9).OR.YLARGE.GT.CKIN(10)) MINT(51)=1 IF(YSMALL.LT.CKIN(11).OR.YSMALL.GT.CKIN(12)) MINT(51)=1 IF(ETALAR.LT.CKIN(13).OR.ETALAR.GT.CKIN(14)) MINT(51)=1 IF(ETASMA.LT.CKIN(15).OR.ETASMA.GT.CKIN(16)) MINT(51)=1 IF(CTSLAR.LT.CKIN(17).OR.CTSLAR.GT.CKIN(18)) MINT(51)=1 IF(CTSSMA.LT.CKIN(19).OR.CTSSMA.GT.CKIN(20)) MINT(51)=1 IF(CTH.LT.CKIN(27).OR.CTH.GT.CKIN(28)) MINT(51)=1 ENDIF IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) THEN IF(TAUP*VINT(2).LT.CKIN(31)**2) MINT(51)=1 IF(CKIN(32).GE.0..AND.TAUP*VINT(2).GT.CKIN(32)**2) MINT(51)=1 ENDIF ELSEIF(ILIM.EQ.1) THEN C...Calculate limits on tau C...0) due to definition TAUMN0=0. TAUMX0=1. C...1) due to limits on subsystem mass TAUMN1=CKIN(1)**2/VINT(2) TAUMX1=1. IF(CKIN(2).GE.0.) TAUMX1=CKIN(2)**2/VINT(2) C...2) due to limits on pT-hat (and non-overlapping rapidity intervals) TM3=SQRT(SQM3+PTHMIN**2) TM4=SQRT(SQM4+PTHMIN**2) YDCOSH=1. IF(CKIN(9).GT.CKIN(12)) YDCOSH=COSH(CKIN(9)-CKIN(12)) TAUMN2=(TM3**2+2.*TM3*TM4*YDCOSH+TM4**2)/VINT(2) TAUMX2=1. C...3) due to limits on pT-hat and cos(theta-hat) CTH2MN=MIN(CKIN(27)**2,CKIN(28)**2) CTH2MX=MAX(CKIN(27)**2,CKIN(28)**2) TAUMN3=0. IF(CKIN(27)*CKIN(28).GT.0.) TAUMN3= & (SQRT(SQM3+PTHMIN**2/(1.-CTH2MN))+ & SQRT(SQM4+PTHMIN**2/(1.-CTH2MN)))**2/VINT(2) TAUMX3=1. IF(CKIN(4).GE.0..AND.CTH2MX.LT.1.) TAUMX3= & (SQRT(SQM3+CKIN(4)**2/(1.-CTH2MX))+ & SQRT(SQM4+CKIN(4)**2/(1.-CTH2MX)))**2/VINT(2) C...4) due to limits on x1 and x2 TAUMN4=CKIN(21)*CKIN(23) TAUMX4=CKIN(22)*CKIN(24) C...5) due to limits on xF TAUMN5=0. TAUMX5=MAX(1.-CKIN(25),1.+CKIN(26)) VINT(11)=MAX(TAUMN0,TAUMN1,TAUMN2,TAUMN3,TAUMN4,TAUMN5) VINT(31)=MIN(TAUMX0,TAUMX1,TAUMX2,TAUMX3,TAUMX4,TAUMX5) IF(MINT(43).EQ.1.AND.(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.2)) THEN VINT(11)=0.99999 VINT(31)=1.00001 ENDIF IF(VINT(31).LE.VINT(11)) MINT(51)=1 ELSEIF(ILIM.EQ.2) THEN C...Calculate limits on y* IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) TAU=VINT(26) TAURT=SQRT(TAU) C...0) due to kinematics YSTMN0=LOG(TAURT) YSTMX0=-YSTMN0 C...1) due to explicit limits YSTMN1=CKIN(7) YSTMX1=CKIN(8) C...2) due to limits on x1 YSTMN2=LOG(MAX(TAU,CKIN(21))/TAURT) YSTMX2=LOG(MAX(TAU,CKIN(22))/TAURT) C...3) due to limits on x2 YSTMN3=-LOG(MAX(TAU,CKIN(24))/TAURT) YSTMX3=-LOG(MAX(TAU,CKIN(23))/TAURT) C...4) due to limits on xF YEPMN4=0.5*ABS(CKIN(25))/TAURT YSTMN4=SIGN(LOG(SQRT(1.+YEPMN4**2)+YEPMN4),CKIN(25)) YEPMX4=0.5*ABS(CKIN(26))/TAURT YSTMX4=SIGN(LOG(SQRT(1.+YEPMX4**2)+YEPMX4),CKIN(26)) C...5) due to simultaneous limits on y-large and y-small YEPSMN=(RM3-RM4)*SINH(CKIN(9)-CKIN(11)) YEPSMX=(RM3-RM4)*SINH(CKIN(10)-CKIN(12)) YDIFMN=ABS(LOG(SQRT(1.+YEPSMN**2)-YEPSMN)) YDIFMX=ABS(LOG(SQRT(1.+YEPSMX**2)-YEPSMX)) YSTMN5=0.5*(CKIN(9)+CKIN(11)-YDIFMN) YSTMX5=0.5*(CKIN(10)+CKIN(12)+YDIFMX) C...6) due to simultaneous limits on cos(theta-hat) and y-large or C... y-small CTHLIM=SQRT(1.-4.*PTHMIN**2/(BE34*TAU*VINT(2))) RZMN=BE34*MAX(CKIN(27),-CTHLIM) RZMX=BE34*MIN(CKIN(28),CTHLIM) YEX3MX=(1.+RM3-RM4+RZMX)/MAX(1E-10,1.+RM3-RM4-RZMX) YEX4MX=(1.+RM4-RM3-RZMN)/MAX(1E-10,1.+RM4-RM3+RZMN) YEX3MN=MAX(1E-10,1.+RM3-RM4+RZMN)/(1.+RM3-RM4-RZMN) YEX4MN=MAX(1E-10,1.+RM4-RM3-RZMX)/(1.+RM4-RM3+RZMX) YSTMN6=CKIN(9)-0.5*LOG(MAX(YEX3MX,YEX4MX)) YSTMX6=CKIN(12)-0.5*LOG(MIN(YEX3MN,YEX4MN)) VINT(12)=MAX(YSTMN0,YSTMN1,YSTMN2,YSTMN3,YSTMN4,YSTMN5,YSTMN6) VINT(32)=MIN(YSTMX0,YSTMX1,YSTMX2,YSTMX3,YSTMX4,YSTMX5,YSTMX6) IF(MINT(43).EQ.1) THEN VINT(12)=-0.00001 VINT(32)=0.00001 ELSEIF(MINT(43).EQ.2) THEN VINT(12)=0.99999*YSTMX0 VINT(32)=1.00001*YSTMX0 ELSEIF(MINT(43).EQ.3) THEN VINT(12)=-1.00001*YSTMX0 VINT(32)=-0.99999*YSTMX0 ENDIF IF(VINT(32).LE.VINT(12)) MINT(51)=1 ELSEIF(ILIM.EQ.3) THEN C...Calculate limits on cos(theta-hat) YST=VINT(22) C...0) due to definition CTNMN0=-1. CTNMX0=0. CTPMN0=0. CTPMX0=1. C...1) due to explicit limits CTNMN1=MIN(0.,CKIN(27)) CTNMX1=MIN(0.,CKIN(28)) CTPMN1=MAX(0.,CKIN(27)) CTPMX1=MAX(0.,CKIN(28)) C...2) due to limits on pT-hat CTNMN2=-SQRT(1.-4.*PTHMIN**2/(BE34**2*TAU*VINT(2))) CTPMX2=-CTNMN2 CTNMX2=0. CTPMN2=0. IF(CKIN(4).GE.0.) THEN CTNMX2=-SQRT(MAX(0.,1.-4.*CKIN(4)**2/(BE34**2*TAU*VINT(2)))) CTPMN2=-CTNMX2 ENDIF C...3) due to limits on y-large and y-small CTNMN3=MIN(0.,MAX((1.+RM3-RM4)/BE34*TANH(CKIN(11)-YST), & -(1.-RM3+RM4)/BE34*TANH(CKIN(10)-YST))) CTNMX3=MIN(0.,(1.+RM3-RM4)/BE34*TANH(CKIN(12)-YST), & -(1.-RM3+RM4)/BE34*TANH(CKIN(9)-YST)) CTPMN3=MAX(0.,(1.+RM3-RM4)/BE34*TANH(CKIN(9)-YST), & -(1.-RM3+RM4)/BE34*TANH(CKIN(12)-YST)) CTPMX3=MAX(0.,MIN((1.+RM3-RM4)/BE34*TANH(CKIN(10)-YST), & -(1.-RM3+RM4)/BE34*TANH(CKIN(11)-YST))) VINT(13)=MAX(CTNMN0,CTNMN1,CTNMN2,CTNMN3) VINT(33)=MIN(CTNMX0,CTNMX1,CTNMX2,CTNMX3) VINT(14)=MAX(CTPMN0,CTPMN1,CTPMN2,CTPMN3) VINT(34)=MIN(CTPMX0,CTPMX1,CTPMX2,CTPMX3) IF(VINT(33).LE.VINT(13).AND.VINT(34).LE.VINT(14)) MINT(51)=1 ELSEIF(ILIM.EQ.4) THEN C...Calculate limits on tau' C...0) due to kinematics TAPMN0=TAU TAPMX0=1. C...1) due to explicit limits TAPMN1=CKIN(31)**2/VINT(2) TAPMX1=1. IF(CKIN(32).GE.0.) TAPMX1=CKIN(32)**2/VINT(2) VINT(16)=MAX(TAPMN0,TAPMN1) VINT(36)=MIN(TAPMX0,TAPMX1) IF(MINT(43).EQ.1) THEN VINT(16)=0.99999 VINT(36)=1.00001 ENDIF IF(VINT(36).LE.VINT(16)) MINT(51)=1 ENDIF RETURN C...Special case for low-pT and multiple interactions: C...effective kinematical limits for tau, y*, cos(theta-hat). 110 IF(ILIM.EQ.0) THEN ELSEIF(ILIM.EQ.1) THEN IF(MSTP(82).LE.1) VINT(11)=4.*PARP(81)**2/VINT(2) IF(MSTP(82).GE.2) VINT(11)=PARP(82)**2/VINT(2) VINT(31)=1. ELSEIF(ILIM.EQ.2) THEN VINT(12)=0.5*LOG(VINT(21)) VINT(32)=-VINT(12) ELSEIF(ILIM.EQ.3) THEN IF(MSTP(82).LE.1) ST2EFF=4.*PARP(81)**2/(VINT(21)*VINT(2)) IF(MSTP(82).GE.2) ST2EFF=0.01*PARP(82)**2/(VINT(21)*VINT(2)) VINT(13)=-SQRT(MAX(0.,1.-ST2EFF)) VINT(33)=0. VINT(14)=0. VINT(34)=-VINT(13) ENDIF RETURN END C********************************************************************* SUBROUTINE PYKMAP(IVAR,MVAR,VVAR) C...Maps a uniform distribution into a distribution of a kinematical C...variable according to one of the possibilities allowed. It is C...assumed that kinematical limits have been set by a PYKLIM call. COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) SAVE /LUDAT2/ SAVE /PYINT1/,/PYINT2/ C...Convert VVAR to tau variable. ISUB=MINT(1) IF(IVAR.EQ.1) THEN TAUMIN=VINT(11) TAUMAX=VINT(31) IF(MVAR.EQ.3.OR.MVAR.EQ.4) THEN TAURE=VINT(73) GAMRE=VINT(74) ELSEIF(MVAR.EQ.5.OR.MVAR.EQ.6) THEN TAURE=VINT(75) GAMRE=VINT(76) ENDIF IF(MINT(43).EQ.1.AND.(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.2)) THEN TAU=1. ELSEIF(MVAR.EQ.1) THEN TAU=TAUMIN*(TAUMAX/TAUMIN)**VVAR ELSEIF(MVAR.EQ.2) THEN TAU=TAUMAX*TAUMIN/(TAUMIN+(TAUMAX-TAUMIN)*VVAR) ELSEIF(MVAR.EQ.3.OR.MVAR.EQ.5) THEN RATGEN=(TAURE+TAUMAX)/(TAURE+TAUMIN)*TAUMIN/TAUMAX TAU=TAURE*TAUMIN/((TAURE+TAUMIN)*RATGEN**VVAR-TAUMIN) ELSE AUPP=ATAN((TAUMAX-TAURE)/GAMRE) ALOW=ATAN((TAUMIN-TAURE)/GAMRE) TAU=TAURE+GAMRE*TAN(ALOW+(AUPP-ALOW)*VVAR) ENDIF VINT(21)=MIN(TAUMAX,MAX(TAUMIN,TAU)) C...Convert VVAR to y* variable. ELSEIF(IVAR.EQ.2) THEN YSTMIN=VINT(12) YSTMAX=VINT(32) IF(MINT(43).EQ.1) THEN YST=0. ELSEIF(MINT(43).EQ.2) THEN IF(ISET(ISUB).LE.2) YST=-0.5*LOG(VINT(21)) IF(ISET(ISUB).GE.3) YST=-0.5*LOG(VINT(26)) ELSEIF(MINT(43).EQ.3) THEN IF(ISET(ISUB).LE.2) YST=0.5*LOG(VINT(21)) IF(ISET(ISUB).GE.3) YST=0.5*LOG(VINT(26)) ELSEIF(MVAR.EQ.1) THEN YST=YSTMIN+(YSTMAX-YSTMIN)*SQRT(VVAR) ELSEIF(MVAR.EQ.2) THEN YST=YSTMAX-(YSTMAX-YSTMIN)*SQRT(1.-VVAR) ELSE AUPP=ATAN(EXP(YSTMAX)) ALOW=ATAN(EXP(YSTMIN)) YST=LOG(TAN(ALOW+(AUPP-ALOW)*VVAR)) ENDIF VINT(22)=MIN(YSTMAX,MAX(YSTMIN,YST)) C...Convert VVAR to cos(theta-hat) variable. ELSEIF(IVAR.EQ.3) THEN RM34=2.*VINT(63)*VINT(64)/(VINT(21)*VINT(2))**2 RSQM=1.+RM34 IF(2.*VINT(71)**2/(VINT(21)*VINT(2)).LT.0.0001) RM34=MAX(RM34, & 2.*VINT(71)**2/(VINT(21)*VINT(2))) CTNMIN=VINT(13) CTNMAX=VINT(33) CTPMIN=VINT(14) CTPMAX=VINT(34) IF(MVAR.EQ.1) THEN ANEG=CTNMAX-CTNMIN APOS=CTPMAX-CTPMIN IF(ANEG.GT.0..AND.VVAR*(ANEG+APOS).LE.ANEG) THEN VCTN=VVAR*(ANEG+APOS)/ANEG CTH=CTNMIN+(CTNMAX-CTNMIN)*VCTN ELSE VCTP=(VVAR*(ANEG+APOS)-ANEG)/APOS CTH=CTPMIN+(CTPMAX-CTPMIN)*VCTP ENDIF ELSEIF(MVAR.EQ.2) THEN RMNMIN=MAX(RM34,RSQM-CTNMIN) RMNMAX=MAX(RM34,RSQM-CTNMAX) RMPMIN=MAX(RM34,RSQM-CTPMIN) RMPMAX=MAX(RM34,RSQM-CTPMAX) ANEG=LOG(RMNMIN/RMNMAX) APOS=LOG(RMPMIN/RMPMAX) IF(ANEG.GT.0..AND.VVAR*(ANEG+APOS).LE.ANEG) THEN VCTN=VVAR*(ANEG+APOS)/ANEG CTH=RSQM-RMNMIN*(RMNMAX/RMNMIN)**VCTN ELSE VCTP=(VVAR*(ANEG+APOS)-ANEG)/APOS CTH=RSQM-RMPMIN*(RMPMAX/RMPMIN)**VCTP ENDIF ELSEIF(MVAR.EQ.3) THEN RMNMIN=MAX(RM34,RSQM+CTNMIN) RMNMAX=MAX(RM34,RSQM+CTNMAX) RMPMIN=MAX(RM34,RSQM+CTPMIN) RMPMAX=MAX(RM34,RSQM+CTPMAX) ANEG=LOG(RMNMAX/RMNMIN) APOS=LOG(RMPMAX/RMPMIN) IF(ANEG.GT.0..AND.VVAR*(ANEG+APOS).LE.ANEG) THEN VCTN=VVAR*(ANEG+APOS)/ANEG CTH=RMNMIN*(RMNMAX/RMNMIN)**VCTN-RSQM ELSE VCTP=(VVAR*(ANEG+APOS)-ANEG)/APOS CTH=RMPMIN*(RMPMAX/RMPMIN)**VCTP-RSQM ENDIF ELSEIF(MVAR.EQ.4) THEN RMNMIN=MAX(RM34,RSQM-CTNMIN) RMNMAX=MAX(RM34,RSQM-CTNMAX) RMPMIN=MAX(RM34,RSQM-CTPMIN) RMPMAX=MAX(RM34,RSQM-CTPMAX) ANEG=1./RMNMAX-1./RMNMIN APOS=1./RMPMAX-1./RMPMIN IF(ANEG.GT.0..AND.VVAR*(ANEG+APOS).LE.ANEG) THEN VCTN=VVAR*(ANEG+APOS)/ANEG CTH=RSQM-1./(1./RMNMIN+ANEG*VCTN) ELSE VCTP=(VVAR*(ANEG+APOS)-ANEG)/APOS CTH=RSQM-1./(1./RMPMIN+APOS*VCTP) ENDIF ELSEIF(MVAR.EQ.5) THEN RMNMIN=MAX(RM34,RSQM+CTNMIN) RMNMAX=MAX(RM34,RSQM+CTNMAX) RMPMIN=MAX(RM34,RSQM+CTPMIN) RMPMAX=MAX(RM34,RSQM+CTPMAX) ANEG=1./RMNMIN-1./RMNMAX APOS=1./RMPMIN-1./RMPMAX IF(ANEG.GT.0..AND.VVAR*(ANEG+APOS).LE.ANEG) THEN VCTN=VVAR*(ANEG+APOS)/ANEG CTH=1./(1./RMNMIN-ANEG*VCTN)-RSQM ELSE VCTP=(VVAR*(ANEG+APOS)-ANEG)/APOS CTH=1./(1./RMPMIN-APOS*VCTP)-RSQM ENDIF ENDIF IF(CTH.LT.0.) CTH=MIN(CTNMAX,MAX(CTNMIN,CTH)) IF(CTH.GT.0.) CTH=MIN(CTPMAX,MAX(CTPMIN,CTH)) VINT(23)=CTH C...Convert VVAR to tau' variable. ELSEIF(IVAR.EQ.4) THEN TAU=VINT(21) TAUPMN=VINT(16) TAUPMX=VINT(36) IF(MINT(43).EQ.1) THEN TAUP=1. ELSEIF(MVAR.EQ.1) THEN TAUP=TAUPMN*(TAUPMX/TAUPMN)**VVAR ELSE AUPP=(1.-TAU/TAUPMX)**4 ALOW=(1.-TAU/TAUPMN)**4 TAUP=TAU/MAX(1E-7,1.-(ALOW+(AUPP-ALOW)*VVAR)**0.25) ENDIF VINT(26)=MIN(TAUPMX,MAX(TAUPMN,TAUP)) ENDIF RETURN END C*********************************************************************** SUBROUTINE PYSIGH(NCHN,SIGS) C...Differential matrix elements for all included subprocesses. C...Note that what is coded is (disregarding the COMFAC factor) C...1) for 2 -> 1 processes: s-hat/pi*d(sigma-hat), where, C...when d(sigma-hat) is given in the zero-width limit, the delta C...function in tau is replaced by a Breit-Wigner: C...1/pi*(s*m_res*Gamma_res)/((s*tau-m_res^2)^2+(m_res*Gamma_res)^2); C...2) for 2 -> 2 processes: (s-hat)**2/pi*d(sigma-hat)/d(t-hat); C...i.e., dimensionless quantities. COMFAC contains the factor C...pi/s and the conversion factor from GeV^-2 to mb. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT4/, &/PYINT5/ DIMENSION X(2),XPQ(-6:6),KFAC(2,-40:40),WDTP(0:40),WDTE(0:40,0:5) C...Reset number of channels and cross-section. NCHN=0 SIGS=0. C...Read kinematical variables and limits. ISUB=MINT(1) TAUMIN=VINT(11) YSTMIN=VINT(12) CTNMIN=VINT(13) CTPMIN=VINT(14) XT2MIN=VINT(15) TAUPMN=VINT(16) TAU=VINT(21) YST=VINT(22) CTH=VINT(23) XT2=VINT(25) TAUP=VINT(26) TAUMAX=VINT(31) YSTMAX=VINT(32) CTNMAX=VINT(33) CTPMAX=VINT(34) XT2MAX=VINT(35) TAUPMX=VINT(36) C...Derive kinematical quantities. IF(ISET(ISUB).LE.2.OR.ISET(ISUB).EQ.5) THEN X(1)=SQRT(TAU)*EXP(YST) X(2)=SQRT(TAU)*EXP(-YST) ELSE X(1)=SQRT(TAUP)*EXP(YST) X(2)=SQRT(TAUP)*EXP(-YST) ENDIF IF(MINT(43).EQ.4.AND.ISET(ISUB).GE.1.AND. &(X(1).GT.0.999.OR.X(2).GT.0.999)) RETURN SH=TAU*VINT(2) SQM3=VINT(63) SQM4=VINT(64) RM3=SQM3/SH RM4=SQM4/SH BE34=SQRT((1.-RM3-RM4)**2-4.*RM3*RM4) RPTS=4.*VINT(71)**2/SH BE34L=SQRT(MAX(0.,(1.-RM3-RM4)**2-4.*RM3*RM4-RPTS)) RM34=2.*RM3*RM4 RSQM=1.+RM34 RTHM=(4.*RM3*RM4+RPTS)/(1.-RM3-RM4+BE34L) TH=-0.5*SH*MAX(RTHM,1.-RM3-RM4-BE34*CTH) UH=-0.5*SH*MAX(RTHM,1.-RM3-RM4+BE34*CTH) SQPTH=MAX(VINT(71)**2,0.25*SH*BE34**2*(1.-CTH**2)) SH2=SH**2 TH2=TH**2 UH2=UH**2 C...Choice of Q2 scale. IF(ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.3) THEN Q2=SH ELSEIF(MOD(ISET(ISUB),2).EQ.0.OR.ISET(ISUB).EQ.5) THEN IF(MSTP(32).EQ.1) THEN Q2=2.*SH*TH*UH/(SH**2+TH**2+UH**2) ELSEIF(MSTP(32).EQ.2) THEN Q2=SQPTH+0.5*(SQM3+SQM4) ELSEIF(MSTP(32).EQ.3) THEN Q2=MIN(-TH,-UH) ELSEIF(MSTP(32).EQ.4) THEN Q2=SH ENDIF IF(ISET(ISUB).EQ.5.AND.MSTP(82).GE.2) Q2=Q2+PARP(82)**2 ENDIF C...Store derived kinematical quantities. VINT(41)=X(1) VINT(42)=X(2) VINT(44)=SH VINT(43)=SQRT(SH) VINT(45)=TH VINT(46)=UH VINT(48)=SQPTH VINT(47)=SQRT(SQPTH) VINT(50)=TAUP*VINT(2) VINT(49)=SQRT(MAX(0.,VINT(50))) VINT(52)=Q2 VINT(51)=SQRT(Q2) C...Calculate parton structure functions. IF(ISET(ISUB).LE.0) GOTO 145 IF(MINT(43).GE.2) THEN Q2SF=Q2 IF(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4) THEN Q2SF=PMAS(23,1)**2 IF(ISUB.EQ.8.OR.ISUB.EQ.76.OR.ISUB.EQ.77) Q2SF=PMAS(24,1)**2 ENDIF DO 100 I=3-MINT(41),MINT(42) XSF=X(I) IF(ISET(ISUB).EQ.5) XSF=X(I)/VINT(142+I) CALL PYSTFU(MINT(10+I),XSF,Q2SF,XPQ) DO 100 KFL=-6,6 100 XSFX(I,KFL)=XPQ(KFL) ENDIF C...Calculate alpha_strong and K-factor. IF(MSTP(33).NE.3) AS=ULALPS(Q2) FACK=1. FACA=1. IF(MSTP(33).EQ.1) THEN FACK=PARP(31) ELSEIF(MSTP(33).EQ.2) THEN FACK=PARP(31) FACA=PARP(32)/PARP(31) ELSEIF(MSTP(33).EQ.3) THEN Q2AS=PARP(33)*Q2 IF(ISET(ISUB).EQ.5.AND.MSTP(82).GE.2) Q2AS=Q2AS+ & PARU(112)*PARP(82) AS=ULALPS(Q2AS) ENDIF RADC=1.+AS/PARU(1) C...Set flags for allowed reacting partons/leptons. DO 130 I=1,2 DO 110 J=-40,40 110 KFAC(I,J)=0 IF(MINT(40+I).EQ.1) THEN KFAC(I,MINT(10+I))=1 ELSE DO 120 J=-40,40 KFAC(I,J)=KFIN(I,J) IF(ABS(J).GT.MSTP(54).AND.J.NE.21) KFAC(I,J)=0 IF(ABS(J).LE.6) THEN IF(XSFX(I,J).LT.1.E-10) KFAC(I,J)=0 ELSEIF(J.EQ.21) THEN IF(XSFX(I,0).LT.1.E-10) KFAC(I,21)=0 ENDIF 120 CONTINUE ENDIF 130 CONTINUE C...Lower and upper limit for flavour loops. MIN1=0 MAX1=0 MIN2=0 MAX2=0 DO 140 J=-20,20 IF(KFAC(1,-J).EQ.1) MIN1=-J IF(KFAC(1,J).EQ.1) MAX1=J IF(KFAC(2,-J).EQ.1) MIN2=-J IF(KFAC(2,J).EQ.1) MAX2=J 140 CONTINUE MINA=MIN(MIN1,MIN2) MAXA=MAX(MAX1,MAX2) C...Common conversion factors (including Jacobian) for subprocesses. SQMZ=PMAS(23,1)**2 GMMZ=PMAS(23,1)*PMAS(23,2) SQMW=PMAS(24,1)**2 GMMW=PMAS(24,1)*PMAS(24,2) SQMH=PMAS(25,1)**2 GMMH=PMAS(25,1)*PMAS(25,2) SQMZP=PMAS(32,1)**2 GMMZP=PMAS(32,1)*PMAS(32,2) SQMHC=PMAS(37,1)**2 GMMHC=PMAS(37,1)*PMAS(37,2) SQMR=PMAS(40,1)**2 GMMR=PMAS(40,1)*PMAS(40,2) AEM=PARU(101) XW=PARU(102) C...Phase space integral in tau and y*. COMFAC=PARU(1)*PARU(5)/VINT(2) IF(MINT(43).EQ.4) COMFAC=COMFAC*FACK IF((MINT(43).GE.2.OR.ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4).AND. &ISET(ISUB).NE.5) THEN ATAU0=LOG(TAUMAX/TAUMIN) ATAU1=(TAUMAX-TAUMIN)/(TAUMAX*TAUMIN) H1=COEF(ISUB,1)+(ATAU0/ATAU1)*COEF(ISUB,2)/TAU IF(MINT(72).GE.1) THEN TAUR1=VINT(73) GAMR1=VINT(74) ATAU2=LOG(TAUMAX/TAUMIN*(TAUMIN+TAUR1)/(TAUMAX+TAUR1))/TAUR1 ATAU3=(ATAN((TAUMAX-TAUR1)/GAMR1)-ATAN((TAUMIN-TAUR1)/GAMR1))/ & GAMR1 H1=H1+(ATAU0/ATAU2)*COEF(ISUB,3)/(TAU+TAUR1)+ & (ATAU0/ATAU3)*COEF(ISUB,4)*TAU/((TAU-TAUR1)**2+GAMR1**2) ENDIF IF(MINT(72).EQ.2) THEN TAUR2=VINT(75) GAMR2=VINT(76) ATAU4=LOG(TAUMAX/TAUMIN*(TAUMIN+TAUR2)/(TAUMAX+TAUR2))/TAUR2 ATAU5=(ATAN((TAUMAX-TAUR2)/GAMR2)-ATAN((TAUMIN-TAUR2)/GAMR2))/ & GAMR2 H1=H1+(ATAU0/ATAU4)*COEF(ISUB,5)/(TAU+TAUR2)+ & (ATAU0/ATAU5)*COEF(ISUB,6)*TAU/((TAU-TAUR2)**2+GAMR2**2) ENDIF COMFAC=COMFAC*ATAU0/(TAU*H1) ENDIF IF(MINT(43).EQ.4.AND.ISET(ISUB).NE.5) THEN AYST0=YSTMAX-YSTMIN AYST1=0.5*(YSTMAX-YSTMIN)**2 AYST2=AYST1 AYST3=2.*(ATAN(EXP(YSTMAX))-ATAN(EXP(YSTMIN))) H2=(AYST0/AYST1)*COEF(ISUB,7)*(YST-YSTMIN)+(AYST0/AYST2)* & COEF(ISUB,8)*(YSTMAX-YST)+(AYST0/AYST3)*COEF(ISUB,9)/COSH(YST) COMFAC=COMFAC*AYST0/H2 ENDIF C...2 -> 1 processes: reduction in angular part of phase space integral C...for case of decaying resonance. ACTH0=CTNMAX-CTNMIN+CTPMAX-CTPMIN IF((ISET(ISUB).EQ.1.OR.ISET(ISUB).EQ.3).AND. &MDCY(KFPR(ISUB,1),1).EQ.1) THEN IF(KFPR(ISUB,1).EQ.25.OR.KFPR(ISUB,1).EQ.37) THEN COMFAC=COMFAC*0.5*ACTH0 ELSE COMFAC=COMFAC*0.125*(3.*ACTH0+CTNMAX**3-CTNMIN**3+ & CTPMAX**3-CTPMIN**3) ENDIF C...2 -> 2 processes: angular part of phase space integral. ELSEIF(ISET(ISUB).EQ.2.OR.ISET(ISUB).EQ.4) THEN ACTH1=LOG((MAX(RM34,RSQM-CTNMIN)*MAX(RM34,RSQM-CTPMIN))/ & (MAX(RM34,RSQM-CTNMAX)*MAX(RM34,RSQM-CTPMAX))) ACTH2=LOG((MAX(RM34,RSQM+CTNMAX)*MAX(RM34,RSQM+CTPMAX))/ & (MAX(RM34,RSQM+CTNMIN)*MAX(RM34,RSQM+CTPMIN))) ACTH3=1./MAX(RM34,RSQM-CTNMAX)-1./MAX(RM34,RSQM-CTNMIN)+ & 1./MAX(RM34,RSQM-CTPMAX)-1./MAX(RM34,RSQM-CTPMIN) ACTH4=1./MAX(RM34,RSQM+CTNMIN)-1./MAX(RM34,RSQM+CTNMAX)+ & 1./MAX(RM34,RSQM+CTPMIN)-1./MAX(RM34,RSQM+CTPMAX) H3=COEF(ISUB,10)+ & (ACTH0/ACTH1)*COEF(ISUB,11)/MAX(RM34,RSQM-CTH)+ & (ACTH0/ACTH2)*COEF(ISUB,12)/MAX(RM34,RSQM+CTH)+ & (ACTH0/ACTH3)*COEF(ISUB,13)/MAX(RM34,RSQM-CTH)**2+ & (ACTH0/ACTH4)*COEF(ISUB,14)/MAX(RM34,RSQM+CTH)**2 COMFAC=COMFAC*ACTH0*0.5*BE34/H3 ENDIF C...2 -> 3, 4 processes: phace space integral in tau'. IF(MINT(43).GE.2.AND.(ISET(ISUB).EQ.3.OR.ISET(ISUB).EQ.4)) THEN ATAUP0=LOG(TAUPMX/TAUPMN) ATAUP1=((1.-TAU/TAUPMX)**4-(1.-TAU/TAUPMN)**4)/(4.*TAU) H4=COEF(ISUB,15)+ & ATAUP0/ATAUP1*COEF(ISUB,16)/TAUP*(1.-TAU/TAUP)**3 IF(1.-TAU/TAUP.GT.1.E-4) THEN FZW=(1.+TAU/TAUP)*LOG(TAUP/TAU)-2.*(1.-TAU/TAUP) ELSE FZW=1./6.*(1.-TAU/TAUP)**3*TAU/TAUP ENDIF COMFAC=COMFAC*ATAUP0*FZW/H4 ENDIF C...Phase space integral for low-pT and multiple interactions. IF(ISET(ISUB).EQ.5) THEN COMFAC=PARU(1)*PARU(5)*FACK*0.5*VINT(2)/SH2 ATAU0=LOG(2.*(1.+SQRT(1.-XT2))/XT2-1.) ATAU1=2.*ATAN(1./XT2-1.)/SQRT(XT2) H1=COEF(ISUB,1)+(ATAU0/ATAU1)*COEF(ISUB,2)/SQRT(TAU) COMFAC=COMFAC*ATAU0/H1 AYST0=YSTMAX-YSTMIN AYST1=0.5*(YSTMAX-YSTMIN)**2 AYST3=2.*(ATAN(EXP(YSTMAX))-ATAN(EXP(YSTMIN))) H2=(AYST0/AYST1)*COEF(ISUB,7)*(YST-YSTMIN)+(AYST0/AYST1)* & COEF(ISUB,8)*(YSTMAX-YST)+(AYST0/AYST3)*COEF(ISUB,9)/COSH(YST) COMFAC=COMFAC*AYST0/H2 IF(MSTP(82).LE.1) COMFAC=COMFAC*XT2**2*(1./VINT(149)-1.) C...For MSTP(82)>=2 an additional factor (xT2/(xT2+VINT(149))**2 is C...introduced to make cross-section finite for xT2 -> 0. IF(MSTP(82).GE.2) COMFAC=COMFAC*XT2**2/(VINT(149)* & (1.+VINT(149))) ENDIF C...A: 2 -> 1, tree diagrams. 145 IF(ISUB.LE.10) THEN IF(ISUB.EQ.1) THEN C...f + fb -> gamma*/Z0. MINT(61)=2 CALL PYWIDT(23,SQRT(SH),WDTP,WDTE) FACZ=COMFAC*AEM**2*4./3. DO 150 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 150 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW FACF=1. IF(IABS(I).LE.10) FACF=FACA/3. NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACF*FACZ*(EI**2*VINT(111)+EI*VI/(8.*XW*(1.-XW))* & SH*(SH-SQMZ)/((SH-SQMZ)**2+GMMZ**2)*VINT(112)+(VI**2+AI**2)/ & (16.*XW*(1.-XW))**2*SH2/((SH-SQMZ)**2+GMMZ**2)*VINT(114)) 150 CONTINUE ELSEIF(ISUB.EQ.2) THEN C...f + fb' -> W+/-. CALL PYWIDT(24,SQRT(SH),WDTP,WDTE) FACW=COMFAC*(AEM/XW)**2*1./24*SH2/((SH-SQMW)**2+GMMW**2) DO 170 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 170 IA=IABS(I) DO 160 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 160 JA=IABS(J) IF(I*J.GT.0.OR.MOD(IA+JA,2).EQ.0) GOTO 160 IF((IA.LE.10.AND.JA.GT.10).OR.(IA.GT.10.AND.JA.LE.10)) GOTO 160 KCHW=(KCHG(IA,1)*ISIGN(1,I)+KCHG(JA,1)*ISIGN(1,J))/3 FACF=1. IF(IA.LE.10) FACF=VCKM((IA+1)/2,(JA+1)/2)*FACA/3. NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACF*FACW*(WDTE(0,1)+WDTE(0,(5-KCHW)/2)+WDTE(0,4)) 160 CONTINUE 170 CONTINUE ELSEIF(ISUB.EQ.3) THEN C...f + fb -> H0. CALL PYWIDT(25,SQRT(SH),WDTP,WDTE) FACH=COMFAC*(AEM/XW)**2*1./48.*(SH/SQMW)**2* & SH2/((SH-SQMH)**2+GMMH**2)*(WDTE(0,1)+WDTE(0,2)+WDTE(0,4)) IF(ABS(SH-SQMH).GT.100.*GMMH) FACH=0. DO 180 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 180 RMQ=PMAS(IABS(I),1)**2/SH NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*RMQ*SQRT(MAX(0.,1.-4.*RMQ)) 180 CONTINUE ELSEIF(ISUB.EQ.4) THEN C...gamma + W+/- -> W+/-. ELSEIF(ISUB.EQ.5) THEN C...Z0 + Z0 -> H0. CALL PYWIDT(25,SQRT(SH),WDTP,WDTE) FACH=COMFAC*1./(128.*PARU(1)**2*16.*(1.-XW)**3)*(AEM/XW)**4* & (SH/SQMW)**2*SH2/((SH-SQMH)**2+GMMH**2)* & (WDTE(0,1)+WDTE(0,2)+WDTE(0,4)) IF(ABS(SH-SQMH).GT.100.*GMMH) FACH=0. DO 200 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 200 DO 190 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 190 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW EJ=KCHG(IABS(J),1)/3. AJ=SIGN(1.,EJ) VJ=AJ-4.*EJ*XW NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*(VI**2+AI**2)*(VJ**2+AJ**2) 190 CONTINUE 200 CONTINUE ELSEIF(ISUB.EQ.6) THEN C...Z0 + W+/- -> W+/-. ELSEIF(ISUB.EQ.7) THEN C...W+ + W- -> Z0. ELSEIF(ISUB.EQ.8) THEN C...W+ + W- -> H0. CALL PYWIDT(25,SQRT(SH),WDTP,WDTE) FACH=COMFAC*1./(128*PARU(1)**2)*(AEM/XW)**4*(SH/SQMW)**2* & SH2/((SH-SQMH)**2+GMMH**2)*(WDTE(0,1)+WDTE(0,2)+WDTE(0,4)) IF(ABS(SH-SQMH).GT.100.*GMMH) FACH=0. DO 220 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 220 EI=SIGN(1.,FLOAT(I))*KCHG(IABS(I),1) DO 210 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 210 EJ=SIGN(1.,FLOAT(J))*KCHG(IABS(J),1) IF(EI*EJ.GT.0.) GOTO 210 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*VINT(180+I)*VINT(180+J) 210 CONTINUE 220 CONTINUE ENDIF C...B: 2 -> 2, tree diagrams. ELSEIF(ISUB.LE.20) THEN IF(ISUB.EQ.11) THEN C...f + f' -> f + f'. FACQQ1=COMFAC*AS**2*4./9.*(SH2+UH2)/TH2 FACQQB=COMFAC*AS**2*4./9.*((SH2+UH2)/TH2*FACA- & MSTP(34)*2./3.*UH2/(SH*TH)) FACQQ2=COMFAC*AS**2*4./9.*((SH2+TH2)/UH2- & MSTP(34)*2./3.*SH2/(TH*UH)) DO 240 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 240 DO 230 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 230 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACQQ1 IF(I.EQ.-J) SIGH(NCHN)=FACQQB IF(I.EQ.J) THEN SIGH(NCHN)=0.5*SIGH(NCHN) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=2 SIGH(NCHN)=0.5*FACQQ2 ENDIF 230 CONTINUE 240 CONTINUE ELSEIF(ISUB.EQ.12) THEN C...f + fb -> f' + fb' (q + qb -> q' + qb' only). CALL PYWIDT(21,SQRT(SH),WDTP,WDTE) FACQQB=COMFAC*AS**2*4./9.*(TH2+UH2)/SH2*(WDTE(0,1)+WDTE(0,2)+ & WDTE(0,3)+WDTE(0,4)) DO 250 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 250 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACQQB 250 CONTINUE ELSEIF(ISUB.EQ.13) THEN C...f + fb -> g + g (q + qb -> g + g only). FACGG1=COMFAC*AS**2*32./27.*(UH/TH-(2.+MSTP(34)*1./4.)*UH2/SH2) FACGG2=COMFAC*AS**2*32./27.*(TH/UH-(2.+MSTP(34)*1./4.)*TH2/SH2) DO 260 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 260 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=0.5*FACGG1 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=2 SIGH(NCHN)=0.5*FACGG2 260 CONTINUE ELSEIF(ISUB.EQ.14) THEN C...f + fb -> g + gamma (q + qb -> g + gamma only). FACGG=COMFAC*AS*AEM*8./9.*(TH2+UH2)/(TH*UH) DO 270 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 270 EI=KCHG(IABS(I),1)/3. NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACGG*EI**2 270 CONTINUE ELSEIF(ISUB.EQ.15) THEN C...f + fb -> g + Z0 (q + qb -> g + Z0 only). FACZG=COMFAC*AS*AEM/(XW*(1.-XW))*1./18.* & (TH2+UH2+2.*SQM4*SH)/(TH*UH) FACZG=FACZG*WIDS(23,2) DO 280 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 280 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACZG*(VI**2+AI**2) 280 CONTINUE ELSEIF(ISUB.EQ.16) THEN C...f + fb' -> g + W+/- (q + qb' -> g + W+/- only). FACWG=COMFAC*AS*AEM/XW*2./9.*(TH2+UH2+2.*SQM4*SH)/(TH*UH) DO 300 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 300 IA=IABS(I) DO 290 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 290 JA=IABS(J) IF(I*J.GT.0.OR.MOD(IA+JA,2).EQ.0) GOTO 290 KCHW=(KCHG(IA,1)*ISIGN(1,I)+KCHG(JA,1)*ISIGN(1,J))/3 FCKM=1. IF(MINT(43).EQ.4) FCKM=VCKM((IA+1)/2,(JA+1)/2) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACWG*FCKM*WIDS(24,(5-KCHW)/2) 290 CONTINUE 300 CONTINUE ELSEIF(ISUB.EQ.17) THEN C...f + fb -> g + H0 (q + qb -> g + H0 only). ELSEIF(ISUB.EQ.18) THEN C...f + fb -> gamma + gamma. FACGG=COMFAC*FACA*AEM**2*1./3.*(TH2+UH2)/(TH*UH) DO 310 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 310 EI=KCHG(IABS(I),1)/3. NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACGG*EI**4 310 CONTINUE ELSEIF(ISUB.EQ.19) THEN C...f + fb -> gamma + Z0. FACGZ=COMFAC*FACA*AEM**2/(XW*(1.-XW))*1./24.* & (TH2+UH2+2.*SQM4*SH)/(TH*UH) FACGZ=FACGZ*WIDS(23,2) DO 320 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 320 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACGZ*EI**2*(VI**2+AI**2) 320 CONTINUE ELSEIF(ISUB.EQ.20) THEN C...f + fb' -> gamma + W+/-. FACGW=COMFAC*FACA*AEM**2/XW*1./6.* & ((2.*UH-TH)/(3.*(SH-SQM4)))**2*(TH2+UH2+2.*SQM4*SH)/(TH*UH) DO 340 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 340 IA=IABS(I) DO 330 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 330 JA=IABS(J) IF(I*J.GT.0.OR.MOD(IA+JA,2).EQ.0) GOTO 330 KCHW=(KCHG(IA,1)*ISIGN(1,I)+KCHG(JA,1)*ISIGN(1,J))/3 FCKM=1. IF(MINT(43).EQ.4) FCKM=VCKM((IA+1)/2,(JA+1)/2) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACGW*FCKM*WIDS(24,(5-KCHW)/2) 330 CONTINUE 340 CONTINUE ENDIF ELSEIF(ISUB.LE.30) THEN IF(ISUB.EQ.21) THEN C...f + fb -> gamma + H0. ELSEIF(ISUB.EQ.22) THEN C...f + fb -> Z0 + Z0. FACZZ=COMFAC*FACA*(AEM/(XW*(1.-XW)))**2*1./768.* & (UH/TH+TH/UH+2.*(SQM3+SQM4)*SH/(TH*UH)- & SQM3*SQM4*(1./TH2+1./UH2)) FACZZ=FACZZ*WIDS(23,1) DO 350 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 350 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACZZ*(VI**4+6.*VI**2*AI**2+AI**4) 350 CONTINUE ELSEIF(ISUB.EQ.23) THEN C...f + fb' -> Z0 + W+/-. FACZW=COMFAC*FACA*(AEM/XW)**2*1./6. FACZW=FACZW*WIDS(23,2) THUH=MAX(TH*UH-SQM3*SQM4,SH*CKIN(3)**2) DO 370 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 370 IA=IABS(I) DO 360 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 360 JA=IABS(J) IF(I*J.GT.0.OR.MOD(IA+JA,2).EQ.0) GOTO 360 KCHW=(KCHG(IA,1)*ISIGN(1,I)+KCHG(JA,1)*ISIGN(1,J))/3 EI=KCHG(IA,1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW EJ=KCHG(JA,1)/3. AJ=SIGN(1.,EJ) VJ=AJ-4.*EJ*XW IF(VI+AI.GT.0) THEN VISAV=VI AISAV=AI VI=VJ AI=AJ VJ=VISAV AJ=AISAV ENDIF FCKM=1. IF(MINT(43).EQ.4) FCKM=VCKM((IA+1)/2,(JA+1)/2) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACZW*FCKM*(1./(SH-SQMW)**2* & ((9.-8.*XW)/4.*THUH+(8.*XW-6.)/4.*SH*(SQM3+SQM4))+ & (THUH-SH*(SQM3+SQM4))/(2.*(SH-SQMW))*((VJ+AJ)/TH-(VI+AI)/UH)+ & THUH/(16.*(1.-XW))*((VJ+AJ)**2/TH2+(VI+AI)**2/UH2)+ & SH*(SQM3+SQM4)/(8.*(1.-XW))*(VI+AI)*(VJ+AJ)/(TH*UH))* & WIDS(24,(5-KCHW)/2) 360 CONTINUE 370 CONTINUE ELSEIF(ISUB.EQ.24) THEN C...f + fb -> Z0 + H0. THUH=MAX(TH*UH-SQM3*SQM4,SH*CKIN(3)**2) FACHZ=COMFAC*FACA*(AEM/(XW*(1.-XW)))**2*1./96.* & (THUH+2.*SH*SQMZ)/(SH-SQMZ)**2 FACHZ=FACHZ*WIDS(23,2)*WIDS(25,2) DO 380 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 380 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACHZ*(VI**2+AI**2) 380 CONTINUE ELSEIF(ISUB.EQ.25) THEN C...f + fb -> W+ + W-. FACWW=COMFAC*FACA*(AEM/XW)**2*1./12. FACWW=FACWW*WIDS(24,1) THUH=MAX(TH*UH-SQM3*SQM4,SH*CKIN(3)**2) DO 390 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 390 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW DSIGWW=THUH/SH2*(3.-(SH-3.*(SQM3+SQM4))/(SH-SQMZ)* & (VI+AI)/(2.*AI*(1.-XW))+(SH/(SH-SQMZ))**2* & (1.-2.*(SQM3+SQM4)/SH+12.*SQM3*SQM4/SH2)*(VI**2+AI**2)/ & (8.*(1.-XW)**2))-2.*SQMZ/(SH-SQMZ)*(VI+AI)/AI+ & SQMZ*SH/(SH-SQMZ)**2*(1.-2.*(SQM3+SQM4)/SH)*(VI**2+AI**2)/ & (2.*(1.-XW)) IF(KCHG(IABS(I),1).LT.0) THEN DSIGWW=DSIGWW+2.*(1.+SQMZ/(SH-SQMZ)*(VI+AI)/(2.*AI))* & (THUH/(SH*TH)-(SQM3+SQM4)/TH)+THUH/TH2 ELSE DSIGWW=DSIGWW+2.*(1.+SQMZ/(SH-SQMZ)*(VI+AI)/(2.*AI))* & (THUH/(SH*UH)-(SQM3+SQM4)/UH)+THUH/UH2 ENDIF NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACWW*DSIGWW 390 CONTINUE ELSEIF(ISUB.EQ.26) THEN C...f + fb' -> W+/- + H0. THUH=MAX(TH*UH-SQM3*SQM4,SH*CKIN(3)**2) FACHW=COMFAC*FACA*(AEM/XW)**2*1./24.*(THUH+2.*SH*SQMW)/ & (SH-SQMW)**2 FACHW=FACHW*WIDS(25,2) DO 410 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 410 IA=IABS(I) DO 400 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(1,J).EQ.0) GOTO 400 JA=IABS(J) IF(I*J.GT.0.OR.MOD(IA+JA,2).EQ.0) GOTO 400 KCHW=(KCHG(IA,1)*ISIGN(1,I)+KCHG(JA,1)*ISIGN(1,J))/3 FCKM=1. IF(MINT(43).EQ.4) FCKM=VCKM((IA+1)/2,(JA+1)/2) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACHW*FCKM*WIDS(24,(5-KCHW)/2) 400 CONTINUE 410 CONTINUE ELSEIF(ISUB.EQ.27) THEN C...f + fb -> H0 + H0. ELSEIF(ISUB.EQ.28) THEN C...f + g -> f + g (q + g -> q + g only). FACQG1=COMFAC*AS**2*4./9.*((2.+MSTP(34)*1./4.)*UH2/TH2-UH/SH)* & FACA FACQG2=COMFAC*AS**2*4./9.*((2.+MSTP(34)*1./4.)*SH2/TH2-SH/UH) DO 430 I=MINA,MAXA IF(I.EQ.0) GOTO 430 DO 420 ISDE=1,2 IF(ISDE.EQ.1.AND.KFAC(1,I)*KFAC(2,21).EQ.0) GOTO 420 IF(ISDE.EQ.2.AND.KFAC(1,21)*KFAC(2,I).EQ.0) GOTO 420 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACQG1 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=2 SIGH(NCHN)=FACQG2 420 CONTINUE 430 CONTINUE ELSEIF(ISUB.EQ.29) THEN C...f + g -> f + gamma (q + g -> q + gamma only). FGQ=COMFAC*FACA*AS*AEM*1./3.*(SH2+UH2)/(-SH*UH) DO 450 I=MINA,MAXA IF(I.EQ.0) GOTO 450 EI=KCHG(IABS(I),1)/3. FACGQ=FGQ*EI**2 DO 440 ISDE=1,2 IF(ISDE.EQ.1.AND.KFAC(1,I)*KFAC(2,21).EQ.0) GOTO 440 IF(ISDE.EQ.2.AND.KFAC(1,21)*KFAC(2,I).EQ.0) GOTO 440 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACGQ 440 CONTINUE 450 CONTINUE ELSEIF(ISUB.EQ.30) THEN C...f + g -> f + Z0 (q + g -> q + Z0 only). FZQ=COMFAC*FACA*AS*AEM/(XW*(1.-XW))*1./48.* & (SH2+UH2+2.*SQM4*TH)/(-SH*UH) FZQ=FZQ*WIDS(23,2) DO 470 I=MINA,MAXA IF(I.EQ.0) GOTO 470 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW FACZQ=FZQ*(VI**2+AI**2) DO 460 ISDE=1,2 IF(ISDE.EQ.1.AND.KFAC(1,I)*KFAC(2,21).EQ.0) GOTO 460 IF(ISDE.EQ.2.AND.KFAC(1,21)*KFAC(2,I).EQ.0) GOTO 460 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACZQ 460 CONTINUE 470 CONTINUE ENDIF ELSEIF(ISUB.LE.40) THEN IF(ISUB.EQ.31) THEN C...f + g -> f' + W+/- (q + g -> q' + W+/- only). FACWQ=COMFAC*FACA*AS*AEM/XW*1./12.* & (SH2+UH2+2.*SQM4*TH)/(-SH*UH) DO 490 I=MINA,MAXA IF(I.EQ.0) GOTO 490 IA=IABS(I) KCHW=ISIGN(1,KCHG(IA,1)*ISIGN(1,I)) DO 480 ISDE=1,2 IF(ISDE.EQ.1.AND.KFAC(1,I)*KFAC(2,21).EQ.0) GOTO 480 IF(ISDE.EQ.2.AND.KFAC(1,21)*KFAC(2,I).EQ.0) GOTO 480 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACWQ*VINT(180+I)*WIDS(24,(5-KCHW)/2) 480 CONTINUE 490 CONTINUE ELSEIF(ISUB.EQ.32) THEN C...f + g -> f + H0 (q + g -> q + H0 only). ELSEIF(ISUB.EQ.33) THEN C...f + gamma -> f + g (q + gamma -> q + g only). ELSEIF(ISUB.EQ.34) THEN C...f + gamma -> f + gamma. ELSEIF(ISUB.EQ.35) THEN C...f + gamma -> f + Z0. ELSEIF(ISUB.EQ.36) THEN C...f + gamma -> f' + W+/-. ELSEIF(ISUB.EQ.37) THEN C...f + gamma -> f + H0. ELSEIF(ISUB.EQ.38) THEN C...f + Z0 -> f + g (q + Z0 -> q + g only). ELSEIF(ISUB.EQ.39) THEN C...f + Z0 -> f + gamma. ELSEIF(ISUB.EQ.40) THEN C...f + Z0 -> f + Z0. ENDIF ELSEIF(ISUB.LE.50) THEN IF(ISUB.EQ.41) THEN C...f + Z0 -> f' + W+/-. ELSEIF(ISUB.EQ.42) THEN C...f + Z0 -> f + H0. ELSEIF(ISUB.EQ.43) THEN C...f + W+/- -> f' + g (q + W+/- -> q' + g only). ELSEIF(ISUB.EQ.44) THEN C...f + W+/- -> f' + gamma. ELSEIF(ISUB.EQ.45) THEN C...f + W+/- -> f' + Z0. ELSEIF(ISUB.EQ.46) THEN C...f + W+/- -> f' + W+/-. ELSEIF(ISUB.EQ.47) THEN C...f + W+/- -> f' + H0. ELSEIF(ISUB.EQ.48) THEN C...f + H0 -> f + g (q + H0 -> q + g only). ELSEIF(ISUB.EQ.49) THEN C...f + H0 -> f + gamma. ELSEIF(ISUB.EQ.50) THEN C...f + H0 -> f + Z0. ENDIF ELSEIF(ISUB.LE.60) THEN IF(ISUB.EQ.51) THEN C...f + H0 -> f' + W+/-. ELSEIF(ISUB.EQ.52) THEN C...f + H0 -> f + H0. ELSEIF(ISUB.EQ.53) THEN C...g + g -> f + fb (g + g -> q + qb only). CALL PYWIDT(21,SQRT(SH),WDTP,WDTE) FACQQ1=COMFAC*AS**2*1./6.*(UH/TH-(2.+MSTP(34)*1./4.)*UH2/SH2)* & (WDTE(0,1)+WDTE(0,2)+WDTE(0,3)+WDTE(0,4))*FACA FACQQ2=COMFAC*AS**2*1./6.*(TH/UH-(2.+MSTP(34)*1./4.)*TH2/SH2)* & (WDTE(0,1)+WDTE(0,2)+WDTE(0,3)+WDTE(0,4))*FACA IF(KFAC(1,21)*KFAC(2,21).EQ.0) GOTO 500 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACQQ1 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=2 SIGH(NCHN)=FACQQ2 500 CONTINUE ELSEIF(ISUB.EQ.54) THEN C...g + gamma -> f + fb (g + gamma -> q + qb only). ELSEIF(ISUB.EQ.55) THEN C...g + gamma -> f + fb (g + gamma -> q + qb only). ELSEIF(ISUB.EQ.56) THEN C...g + gamma -> f + fb (g + gamma -> q + qb only). ELSEIF(ISUB.EQ.57) THEN C...g + gamma -> f + fb (g + gamma -> q + qb only). ELSEIF(ISUB.EQ.58) THEN C...gamma + gamma -> f + fb. ELSEIF(ISUB.EQ.59) THEN C...gamma + Z0 -> f + fb. ELSEIF(ISUB.EQ.60) THEN C...gamma + W+/- -> f + fb'. ENDIF ELSEIF(ISUB.LE.70) THEN IF(ISUB.EQ.61) THEN C...gamma + H0 -> f + fb. ELSEIF(ISUB.EQ.62) THEN C...Z0 + Z0 -> f + fb. ELSEIF(ISUB.EQ.63) THEN C...Z0 + W+/- -> f + fb'. ELSEIF(ISUB.EQ.64) THEN C...Z0 + H0 -> f + fb. ELSEIF(ISUB.EQ.65) THEN C...W+ + W- -> f + fb. ELSEIF(ISUB.EQ.66) THEN C...W+/- + H0 -> f + fb'. ELSEIF(ISUB.EQ.67) THEN C...H0 + H0 -> f + fb. ELSEIF(ISUB.EQ.68) THEN C...g + g -> g + g. FACGG1=COMFAC*AS**2*9./4.*(SH2/TH2+2.*SH/TH+3.+2.*TH/SH+ & TH2/SH2)*FACA FACGG2=COMFAC*AS**2*9./4.*(UH2/SH2+2.*UH/SH+3.+2.*SH/UH+ & SH2/UH2)*FACA FACGG3=COMFAC*AS**2*9./4.*(TH2/UH2+2.*TH/UH+3+2.*UH/TH+UH2/TH2) IF(KFAC(1,21)*KFAC(2,21).EQ.0) GOTO 510 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=0.5*FACGG1 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=2 SIGH(NCHN)=0.5*FACGG2 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=3 SIGH(NCHN)=0.5*FACGG3 510 CONTINUE ELSEIF(ISUB.EQ.69) THEN C...gamma + gamma -> W+ + W-. ELSEIF(ISUB.EQ.70) THEN C...gamma + W+/- -> gamma + W+/-. ENDIF ELSEIF(ISUB.LE.80) THEN IF(ISUB.EQ.71) THEN C...Z0 + Z0 -> Z0 + Z0. BE2=1.-4.*SQMZ/SH TH=-0.5*SH*BE2*(1.-CTH) UH=-0.5*SH*BE2*(1.+CTH) SHANG=1./(1.-XW)*SQMW/SQMZ*(1.+BE2)**2 ASHRE=(SH-SQMH)/((SH-SQMH)**2+GMMH**2)*SHANG ASHIM=-GMMH/((SH-SQMH)**2+GMMH**2)*SHANG THANG=1./(1.-XW)*SQMW/SQMZ*(BE2-CTH)**2 ATHRE=(TH-SQMH)/((TH-SQMH)**2+GMMH**2)*THANG ATHIM=-GMMH/((TH-SQMH)**2+GMMH**2)*THANG UHANG=1./(1.-XW)*SQMW/SQMZ*(BE2+CTH)**2 AUHRE=(UH-SQMH)/((UH-SQMH)**2+GMMH**2)*UHANG AUHIM=-GMMH/((UH-SQMH)**2+GMMH**2)*UHANG FACH=0.5*COMFAC*1./(4096.*PARU(1)**2*16.*(1.-XW)**2)* & (AEM/XW)**4*(SH/SQMW)**2*((ASHRE+ATHRE+AUHRE)**2+ & (ASHIM+ATHIM+AUHIM)**2)*SQMZ/SQMW DO 530 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 530 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW AVI=AI**2+VI**2 DO 520 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 520 EJ=KCHG(IABS(J),1)/3. AJ=SIGN(1.,EJ) VJ=AJ-4.*EJ*XW AVJ=AJ**2+VJ**2 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*AVI*AVJ 520 CONTINUE 530 CONTINUE ELSEIF(ISUB.EQ.72) THEN C...Z0 + Z0 -> W+ + W-. BE2=SQRT((1.-4.*SQMW/SH)*(1.-4.*SQMZ/SH)) CTH2=CTH**2 TH=-0.5*SH*(1.-2.*(SQMW+SQMZ)/SH-BE2*CTH) UH=-0.5*SH*(1.-2.*(SQMW+SQMZ)/SH+BE2*CTH) SHANG=4.*SQRT(SQMW/(SQMZ*(1.-XW)))*(1.-2.*SQMW/SH)* & (1.-2.*SQMZ/SH) ASHRE=(SH-SQMH)/((SH-SQMH)**2+GMMH**2)*SHANG ASHIM=-GMMH/((SH-SQMH)**2+GMMH**2)*SHANG ATWRE=(1.-XW)/SQMZ*SH/(TH-SQMW)*((CTH-BE2)**2*(3./2.+BE2/2.*CTH- & (SQMW+SQMZ)/SH+(SQMW-SQMZ)**2/(SH*SQMW))+4.*((SQMW+SQMZ)/SH* & (1.-3.*CTH2)+8.*SQMW*SQMZ/SH2*(2.*CTH2-1.)+ & 4.*(SQMW**2+SQMZ**2)/SH2*CTH2+2.*(SQMW+SQMZ)/SH*BE2*CTH)) ATWIM=0. AUWRE=(1.-XW)/SQMZ*SH/(UH-SQMW)*((CTH+BE2)**2*(3./2.-BE2/2.*CTH- & (SQMW+SQMZ)/SH+(SQMW-SQMZ)**2/(SH*SQMW))+4.*((SQMW+SQMZ)/SH* & (1.-3.*CTH2)+8.*SQMW*SQMZ/SH2*(2.*CTH2-1.)+ & 4.*(SQMW**2+SQMZ**2)/SH2*CTH2-2.*(SQMW+SQMZ)/SH*BE2*CTH)) AUWIM=0. A4RE=2.*(1.-XW)/SQMZ*(3.-CTH2-4.*(SQMW+SQMZ)/SH) A4IM=0. FACH=COMFAC*1./(4096.*PARU(1)**2*16.*(1.-XW)**2)*(AEM/XW)**4* & (SH/SQMW)**2*((ASHRE+ATWRE+AUWRE+A4RE)**2+ & (ASHIM+ATWIM+AUWIM+A4IM)**2)*SQMZ/SQMW DO 550 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 550 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW AVI=AI**2+VI**2 DO 540 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 540 EJ=KCHG(IABS(J),1)/3. AJ=SIGN(1.,EJ) VJ=AJ-4.*EJ*XW AVJ=AJ**2+VJ**2 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*AVI*AVJ 540 CONTINUE 550 CONTINUE ELSEIF(ISUB.EQ.73) THEN C...Z0 + W+/- -> Z0 + W+/-. BE2=1.-2.*(SQMZ+SQMW)/SH+((SQMZ-SQMW)/SH)**2 EP1=1.+(SQMZ-SQMW)/SH EP2=1.-(SQMZ-SQMW)/SH TH=-0.5*SH*BE2*(1.-CTH) UH=(SQMZ-SQMW)**2/SH-0.5*SH*BE2*(1.+CTH) THANG=SQRT(SQMW/(SQMZ*(1.-XW)))*(BE2-EP1*CTH)*(BE2-EP2*CTH) ATHRE=(TH-SQMH)/((TH-SQMH)**2+GMMH**2)*THANG ATHIM=-GMMH/((TH-SQMH)**2+GMMH**2)*THANG ASWRE=(1.-XW)/SQMZ*SH/(SH-SQMW)*(-BE2*(EP1+EP2)**4*CTH+ & 1./4.*(BE2+EP1*EP2)**2*((EP1-EP2)**2-4.*BE2*CTH)+ & 2.*BE2*(BE2+EP1*EP2)*(EP1+EP2)**2*CTH- & 1./16.*SH/SQMW*(EP1**2-EP2**2)**2*(BE2+EP1*EP2)**2) ASWIM=0. AUWRE=(1.-XW)/SQMZ*SH/(UH-SQMW)*(-BE2*(EP2+EP1*CTH)* & (EP1+EP2*CTH)*(BE2+EP1*EP2)+BE2*(EP2+EP1*CTH)* & (BE2+EP1*EP2*CTH)*(2.*EP2-EP2*CTH+EP1)-BE2*(EP2+EP1*CTH)**2* & (BE2-EP2**2*CTH)-1./8.*(BE2+EP1*EP2*CTH)**2*((EP1+EP2)**2+ & 2.*BE2*(1.-CTH))+1./32.*SH/SQMW*(BE2+EP1*EP2*CTH)**2* & (EP1**2-EP2**2)**2-BE2*(EP1+EP2*CTH)*(EP2+EP1*CTH)* & (BE2+EP1*EP2)+BE2*(EP1+EP2*CTH)*(BE2+EP1*EP2*CTH)* & (2.*EP1-EP1*CTH+EP2)-BE2*(EP1+EP2*CTH)**2*(BE2-EP1**2*CTH)- & 1./8.*(BE2+EP1*EP2*CTH)**2*((EP1+EP2)**2+2.*BE2*(1.-CTH))+ & 1./32.*SH/SQMW*(BE2+EP1*EP2*CTH)**2*(EP1**2-EP2**2)**2) AUWIM=0. A4RE=(1.-XW)/SQMZ*(EP1**2*EP2**2*(CTH**2-1.)- & 2.*BE2*(EP1**2+EP2**2+EP1*EP2)*CTH-2.*BE2*EP1*EP2) A4IM=0. FACH=COMFAC*1./(4096.*PARU(1)**2*4.*(1.-XW))*(AEM/XW)**4* & (SH/SQMW)**2*((ATHRE+ASWRE+AUWRE+A4RE)**2+ & (ATHIM+ASWIM+AUWIM+A4IM)**2)*SQRT(SQMZ/SQMW) DO 570 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 570 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW AVI=AI**2+VI**2 DO 560 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 560 EJ=KCHG(IABS(J),1)/3. AJ=SIGN(1.,EJ) VJ=AI-4.*EJ*XW AVJ=AJ**2+VJ**2 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*(AVI*VINT(180+J)+VINT(180+I)*AVJ) 560 CONTINUE 570 CONTINUE ELSEIF(ISUB.EQ.75) THEN C...W+ + W- -> gamma + gamma. ELSEIF(ISUB.EQ.76) THEN C...W+ + W- -> Z0 + Z0. BE2=SQRT((1.-4.*SQMW/SH)*(1.-4.*SQMZ/SH)) CTH2=CTH**2 TH=-0.5*SH*(1.-2.*(SQMW+SQMZ)/SH-BE2*CTH) UH=-0.5*SH*(1.-2.*(SQMW+SQMZ)/SH+BE2*CTH) SHANG=4.*SQRT(SQMW/(SQMZ*(1.-XW)))*(1.-2.*SQMW/SH)* & (1.-2.*SQMZ/SH) ASHRE=(SH-SQMH)/((SH-SQMH)**2+GMMH**2)*SHANG ASHIM=-GMMH/((SH-SQMH)**2+GMMH**2)*SHANG ATWRE=(1.-XW)/SQMZ*SH/(TH-SQMW)*((CTH-BE2)**2*(3./2.+BE2/2.*CTH- & (SQMW+SQMZ)/SH+(SQMW-SQMZ)**2/(SH*SQMW))+4.*((SQMW+SQMZ)/SH* & (1.-3.*CTH2)+8.*SQMW*SQMZ/SH2*(2.*CTH2-1.)+ & 4.*(SQMW**2+SQMZ**2)/SH2*CTH2+2.*(SQMW+SQMZ)/SH*BE2*CTH)) ATWIM=0. AUWRE=(1.-XW)/SQMZ*SH/(UH-SQMW)*((CTH+BE2)**2*(3./2.-BE2/2.*CTH- & (SQMW+SQMZ)/SH+(SQMW-SQMZ)**2/(SH*SQMW))+4.*((SQMW+SQMZ)/SH* & (1.-3.*CTH2)+8.*SQMW*SQMZ/SH2*(2.*CTH2-1.)+ & 4.*(SQMW**2+SQMZ**2)/SH2*CTH2-2.*(SQMW+SQMZ)/SH*BE2*CTH)) AUWIM=0. A4RE=2.*(1.-XW)/SQMZ*(3.-CTH2-4.*(SQMW+SQMZ)/SH) A4IM=0. FACH=0.5*COMFAC*1./(4096.*PARU(1)**2)*(AEM/XW)**4*(SH/SQMW)**2* & ((ASHRE+ATWRE+AUWRE+A4RE)**2+(ASHIM+ATWIM+AUWIM+A4IM)**2) DO 590 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 590 EI=SIGN(1.,FLOAT(I))*KCHG(IABS(I),1) DO 580 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 580 EJ=SIGN(1.,FLOAT(J))*KCHG(IABS(J),1) IF(EI*EJ.GT.0.) GOTO 580 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*VINT(180+I)*VINT(180+J) 580 CONTINUE 590 CONTINUE ELSEIF(ISUB.EQ.77) THEN C...W+/- + W+/- -> W+/- + W+/-. BE2=1.-4.*SQMW/SH BE4=BE2**2 CTH2=CTH**2 CTH3=CTH**3 TH=-0.5*SH*BE2*(1.-CTH) UH=-0.5*SH*BE2*(1.+CTH) SHANG=(1.+BE2)**2 ASHRE=(SH-SQMH)/((SH-SQMH)**2+GMMH**2)*SHANG ASHIM=-GMMH/((SH-SQMH)**2+GMMH**2)*SHANG THANG=(BE2-CTH)**2 ATHRE=(TH-SQMH)/((TH-SQMH)**2+GMMH**2)*THANG ATHIM=-GMMH/((TH-SQMH)**2+GMMH**2)*THANG SGZANG=1./SQMW*BE2*(3.-BE2)**2*CTH ASGRE=XW*SGZANG ASGIM=0. ASZRE=(1.-XW)*SH/(SH-SQMZ)*SGZANG ASZIM=0. TGZANG=1./SQMW*(BE2*(4.-2.*BE2+BE4)+BE2*(4.-10.*BE2+BE4)*CTH+ & (2.-11.*BE2+10.*BE4)*CTH2+BE2*CTH3) ATGRE=0.5*XW*SH/TH*TGZANG ATGIM=0. ATZRE=0.5*(1.-XW)*SH/(TH-SQMZ)*TGZANG ATZIM=0. A4RE=1./SQMW*(1.+2.*BE2-6.*BE2*CTH-CTH2) A4IM=0. FACH=COMFAC*1./(4096.*PARU(1)**2)*(AEM/XW)**4*(SH/SQMW)**2* & ((ASHRE+ATHRE+ASGRE+ASZRE+ATGRE+ATZRE+A4RE)**2+ & (ASHIM+ATHIM+ASGIM+ASZIM+ATGIM+ATZIM+A4IM)**2) DO 610 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 610 EI=SIGN(1.,FLOAT(I))*KCHG(IABS(I),1) DO 600 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 600 EJ=SIGN(1.,FLOAT(J))*KCHG(IABS(J),1) IF(EI*EJ.GT.0.) GOTO 600 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACH*VINT(180+I)*VINT(180+J) 600 CONTINUE 610 CONTINUE ELSEIF(ISUB.EQ.78) THEN C...W+/- + H0 -> W+/- + H0. ELSEIF(ISUB.EQ.79) THEN C...H0 + H0 -> H0 + H0. ENDIF C...C: 2 -> 2, tree diagrams with masses. ELSEIF(ISUB.LE.90) THEN IF(ISUB.EQ.81) THEN C...q + qb -> Q + QB. FACQQB=COMFAC*AS**2*4./9.*(((TH-SQM3)**2+ & (UH-SQM3)**2)/SH2+2.*SQM3/SH) IF(MSTP(35).GE.1) THEN IF(MSTP(35).EQ.1) THEN ALSSG=PARP(35) ELSE MST115=MSTU(115) MSTU(115)=MSTP(36) Q2BN=SQRT(SQM3*((SQRT(SH)-2.*SQRT(SQM3))**2+PARP(36)**2)) ALSSG=ULALPS(Q2BN) MSTU(115)=MST115 ENDIF XREPU=PARU(1)*ALSSG/(6.*SQRT(MAX(1E-20,1.-4.*SQM3/SH))) FREPU=XREPU/(EXP(MIN(100.,XREPU))-1.) PARI(81)=FREPU FACQQB=FACQQB*FREPU ENDIF DO 620 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 620 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACQQB 620 CONTINUE ELSEIF(ISUB.EQ.82) THEN C...g + g -> Q + QB. FACQQ1=COMFAC*FACA*AS**2*1./6.*((UH-SQM3)/(TH-SQM3)- & 2.*(UH-SQM3)**2/SH2+4.*SQM3/SH*(TH*UH-SQM3**2)/(TH-SQM3)**2) FACQQ2=COMFAC*FACA*AS**2*1./6.*((TH-SQM3)/(UH-SQM3)- & 2.*(TH-SQM3)**2/SH2+4.*SQM3/SH*(TH*UH-SQM3**2)/(UH-SQM3)**2) IF(MSTP(35).GE.1) THEN IF(MSTP(35).EQ.1) THEN ALSSG=PARP(35) ELSE MST115=MSTU(115) MSTU(115)=MSTP(36) Q2BN=SQRT(SQM3*((SQRT(SH)-2.*SQRT(SQM3))**2+PARP(36)**2)) ALSSG=ULALPS(Q2BN) MSTU(115)=MST115 ENDIF XATTR=4.*PARU(1)*ALSSG/(3.*SQRT(MAX(1E-20,1.-4.*SQM3/SH))) FATTR=XATTR/(1.-EXP(-MIN(100.,XATTR))) XREPU=PARU(1)*ALSSG/(6.*SQRT(MAX(1E-20,1.-4.*SQM3/SH))) FREPU=XREPU/(EXP(MIN(100.,XREPU))-1.) FATRE=(2.*FATTR+5.*FREPU)/7. PARI(81)=FATRE FACQQ1=FACQQ1*FATRE FACQQ2=FACQQ2*FATRE ENDIF IF(KFAC(1,21)*KFAC(2,21).EQ.0) GOTO 630 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACQQ1 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=2 SIGH(NCHN)=FACQQ2 630 CONTINUE ENDIF C...D: Mimimum bias processes. ELSEIF(ISUB.LE.100) THEN IF(ISUB.EQ.91) THEN C...Elastic scattering. SIGS=XSEC(ISUB,1) ELSEIF(ISUB.EQ.92) THEN C...Single diffractive scattering. SIGS=XSEC(ISUB,1) ELSEIF(ISUB.EQ.93) THEN C...Double diffractive scattering. SIGS=XSEC(ISUB,1) ELSEIF(ISUB.EQ.94) THEN C...Central diffractive scattering. SIGS=XSEC(ISUB,1) ELSEIF(ISUB.EQ.95) THEN C...Low-pT scattering. SIGS=XSEC(ISUB,1) ELSEIF(ISUB.EQ.96) THEN C...Multiple interactions: sum of QCD processes. CALL PYWIDT(21,SQRT(SH),WDTP,WDTE) C...q + q' -> q + q'. FACQQ1=COMFAC*AS**2*4./9.*(SH2+UH2)/TH2 FACQQB=COMFAC*AS**2*4./9.*((SH2+UH2)/TH2*FACA- & MSTP(34)*2./3.*UH2/(SH*TH)) FACQQ2=COMFAC*AS**2*4./9.*((SH2+TH2)/UH2- & MSTP(34)*2./3.*SH2/(TH*UH)) DO 650 I=-3,3 IF(I.EQ.0) GOTO 650 DO 640 J=-3,3 IF(J.EQ.0) GOTO 640 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=111 SIGH(NCHN)=FACQQ1 IF(I.EQ.-J) SIGH(NCHN)=FACQQB IF(I.EQ.J) THEN SIGH(NCHN)=0.5*SIGH(NCHN) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=112 SIGH(NCHN)=0.5*FACQQ2 ENDIF 640 CONTINUE 650 CONTINUE C...q + qb -> q' + qb' or g + g. FACQQB=COMFAC*AS**2*4./9.*(TH2+UH2)/SH2*(WDTE(0,1)+WDTE(0,2)+ & WDTE(0,3)+WDTE(0,4)) FACGG1=COMFAC*AS**2*32./27.*(UH/TH-(2.+MSTP(34)*1./4.)*UH2/SH2) FACGG2=COMFAC*AS**2*32./27.*(TH/UH-(2.+MSTP(34)*1./4.)*TH2/SH2) DO 660 I=-3,3 IF(I.EQ.0) GOTO 660 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=121 SIGH(NCHN)=FACQQB NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=131 SIGH(NCHN)=0.5*FACGG1 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=132 SIGH(NCHN)=0.5*FACGG2 660 CONTINUE C...q + g -> q + g. FACQG1=COMFAC*AS**2*4./9.*((2.+MSTP(34)*1./4.)*UH2/TH2-UH/SH)* & FACA FACQG2=COMFAC*AS**2*4./9.*((2.+MSTP(34)*1./4.)*SH2/TH2-SH/UH) DO 680 I=-3,3 IF(I.EQ.0) GOTO 680 DO 670 ISDE=1,2 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=281 SIGH(NCHN)=FACQG1 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=282 SIGH(NCHN)=FACQG2 670 CONTINUE 680 CONTINUE C...g + g -> q + qb or g + g. FACQQ1=COMFAC*AS**2*1./6.*(UH/TH-(2.+MSTP(34)*1./4.)*UH2/SH2)* & (WDTE(0,1)+WDTE(0,2)+WDTE(0,3)+WDTE(0,4))*FACA FACQQ2=COMFAC*AS**2*1./6.*(TH/UH-(2.+MSTP(34)*1./4.)*TH2/SH2)* & (WDTE(0,1)+WDTE(0,2)+WDTE(0,3)+WDTE(0,4))*FACA FACGG1=COMFAC*AS**2*9./4.*(SH2/TH2+2.*SH/TH+3.+2.*TH/SH+ & TH2/SH2)*FACA FACGG2=COMFAC*AS**2*9./4.*(UH2/SH2+2.*UH/SH+3.+2.*SH/UH+ & SH2/UH2)*FACA FACGG3=COMFAC*AS**2*9./4.*(TH2/UH2+2.*TH/UH+3+2.*UH/TH+UH2/TH2) NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=531 SIGH(NCHN)=FACQQ1 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=532 SIGH(NCHN)=FACQQ2 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=681 SIGH(NCHN)=0.5*FACGG1 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=682 SIGH(NCHN)=0.5*FACGG2 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=683 SIGH(NCHN)=0.5*FACGG3 ENDIF C...E: 2 -> 1, loop diagrams. ELSEIF(ISUB.LE.110) THEN IF(ISUB.EQ.101) THEN C...g + g -> gamma*/Z0. ELSEIF(ISUB.EQ.102) THEN C...g + g -> H0. CALL PYWIDT(25,SQRT(SH),WDTP,WDTE) ETARE=0. ETAIM=0. DO 690 I=1,2*MSTP(1) EPS=4.*PMAS(I,1)**2/SH IF(EPS.LE.1.) THEN IF(EPS.GT.1.E-4) THEN ROOT=SQRT(1.-EPS) RLN=LOG((1.+ROOT)/(1.-ROOT)) ELSE RLN=LOG(4./EPS-2.) ENDIF PHIRE=0.25*(RLN**2-PARU(1)**2) PHIIM=0.5*PARU(1)*RLN ELSE PHIRE=-(ASIN(1./SQRT(EPS)))**2 PHIIM=0. ENDIF ETARE=ETARE+0.5*EPS*(1.+(EPS-1.)*PHIRE) ETAIM=ETAIM+0.5*EPS*(EPS-1.)*PHIIM 690 CONTINUE ETA2=ETARE**2+ETAIM**2 FACH=COMFAC*FACA*(AS/PARU(1)*AEM/XW)**2*1./512.* & (SH/SQMW)**2*ETA2*SH2/((SH-SQMH)**2+GMMH**2)* & (WDTE(0,1)+WDTE(0,2)+WDTE(0,4)) IF(ABS(SH-SQMH).GT.100.*GMMH) FACH=0. IF(KFAC(1,21)*KFAC(2,21).EQ.0) GOTO 700 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACH 700 CONTINUE ENDIF C...F: 2 -> 2, box diagrams. ELSEIF(ISUB.LE.120) THEN IF(ISUB.EQ.111) THEN C...f + fb -> g + H0 (q + qb -> g + H0 only). A5STUR=0. A5STUI=0. DO 710 I=1,2*MSTP(1) SQMQ=PMAS(I,1)**2 EPSS=4.*SQMQ/SH EPSH=4.*SQMQ/SQMH A5STUR=A5STUR+SQMQ/SQMH*(4.+4.*SH/(TH+UH)*(PYW1AU(EPSS,1)- & PYW1AU(EPSH,1))+(1.-4.*SQMQ/(TH+UH))*(PYW2AU(EPSS,1)- & PYW2AU(EPSH,1))) A5STUI=A5STUI+SQMQ/SQMH*(4.*SH/(TH+UH)*(PYW1AU(EPSS,2)- & PYW1AU(EPSH,2))+(1.-4.*SQMQ/(TH+UH))*(PYW2AU(EPSS,2)- & PYW2AU(EPSH,2))) 710 CONTINUE FACGH=COMFAC*FACA/(144.*PARU(1)**2)*AEM/XW*AS**3*SQMH/SQMW* & SQMH/SH*(UH**2+TH**2)/(UH+TH)**2*(A5STUR**2+A5STUI**2) FACGH=FACGH*WIDS(25,2) DO 720 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 720 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACGH 720 CONTINUE ELSEIF(ISUB.EQ.112) THEN C...f + g -> f + H0 (q + g -> q + H0 only). A5TSUR=0. A5TSUI=0. DO 730 I=1,2*MSTP(1) SQMQ=PMAS(I,1)**2 EPST=4.*SQMQ/TH EPSH=4.*SQMQ/SQMH A5TSUR=A5TSUR+SQMQ/SQMH*(4.+4.*TH/(SH+UH)*(PYW1AU(EPST,1)- & PYW1AU(EPSH,1))+(1.-4.*SQMQ/(SH+UH))*(PYW2AU(EPST,1)- & PYW2AU(EPSH,1))) A5TSUI=A5TSUI+SQMQ/SQMH*(4.*TH/(SH+UH)*(PYW1AU(EPST,2)- & PYW1AU(EPSH,2))+(1.-4.*SQMQ/(SH+UH))*(PYW2AU(EPST,2)- & PYW2AU(EPSH,2))) 730 CONTINUE FACQH=COMFAC*FACA/(384.*PARU(1)**2)*AEM/XW*AS**3*SQMH/SQMW* & SQMH/(-TH)*(UH**2+SH**2)/(UH+SH)**2*(A5TSUR**2+A5TSUI**2) FACQH=FACQH*WIDS(25,2) DO 750 I=MINA,MAXA IF(I.EQ.0) GOTO 750 DO 740 ISDE=1,2 IF(ISDE.EQ.1.AND.KFAC(1,I)*KFAC(2,21).EQ.0) GOTO 740 IF(ISDE.EQ.2.AND.KFAC(1,21)*KFAC(2,I).EQ.0) GOTO 740 NCHN=NCHN+1 ISIG(NCHN,ISDE)=I ISIG(NCHN,3-ISDE)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACQH 740 CONTINUE 750 CONTINUE ELSEIF(ISUB.EQ.113) THEN C...g + g -> g + H0. A2STUR=0. A2STUI=0. A2USTR=0. A2USTI=0. A2TUSR=0. A2TUSI=0. A4STUR=0. A4STUI=0. DO 760 I=1,2*MSTP(1) SQMQ=PMAS(I,1)**2 EPSS=4.*SQMQ/SH EPST=4.*SQMQ/TH EPSU=4.*SQMQ/UH EPSH=4.*SQMQ/SQMH IF(EPSH.LT.1.E-6) GOTO 760 W3STUR=PYI3AU(EPSH,SQMH/SH*TH/UH,1)-PYI3AU(EPSS,TH/UH,1)- & PYI3AU(EPSU,TH/SH,1) W3STUI=PYI3AU(EPSH,SQMH/SH*TH/UH,2)-PYI3AU(EPSS,TH/UH,2)- & PYI3AU(EPSU,TH/SH,2) W3SUTR=PYI3AU(EPSH,SQMH/SH*UH/TH,1)-PYI3AU(EPSS,UH/TH,1)- & PYI3AU(EPST,UH/SH,1) W3SUTI=PYI3AU(EPSH,SQMH/SH*UH/TH,2)-PYI3AU(EPSS,UH/TH,2)- & PYI3AU(EPST,UH/SH,2) W3TSUR=PYI3AU(EPSH,SQMH/TH*SH/UH,1)-PYI3AU(EPST,SH/UH,1)- & PYI3AU(EPSU,SH/TH,1) W3TSUI=PYI3AU(EPSH,SQMH/TH*SH/UH,2)-PYI3AU(EPST,SH/UH,2)- & PYI3AU(EPSU,SH/TH,2) W3TUSR=PYI3AU(EPSH,SQMH/TH*UH/SH,1)-PYI3AU(EPST,UH/SH,1)- & PYI3AU(EPSS,UH/TH,1) W3TUSI=PYI3AU(EPSH,SQMH/TH*UH/SH,2)-PYI3AU(EPST,UH/SH,2)- & PYI3AU(EPSS,UH/TH,2) W3USTR=PYI3AU(EPSH,SQMH/UH*SH/TH,1)-PYI3AU(EPSU,SH/TH,1)- & PYI3AU(EPST,SH/UH,1) W3USTI=PYI3AU(EPSH,SQMH/UH*SH/TH,2)-PYI3AU(EPSU,SH/TH,2)- & PYI3AU(EPST,SH/UH,2) W3UTSR=PYI3AU(EPSH,SQMH/UH*TH/SH,1)-PYI3AU(EPSU,TH/SH,1)- & PYI3AU(EPSS,TH/UH,1) W3UTSI=PYI3AU(EPSH,SQMH/UH*TH/SH,2)-PYI3AU(EPSU,TH/SH,2)- & PYI3AU(EPSS,TH/UH,2) B2STUR=SQMQ/SQMH**2*(SH*(UH-SH)/(SH+UH)+2.*TH*UH*(UH+2.*SH)/ & (SH+UH)**2*(PYW1AU(EPST,1)-PYW1AU(EPSH,1))+(SQMQ-SH/4.)* & (0.5*PYW2AU(EPSS,1)+0.5*PYW2AU(EPSH,1)-PYW2AU(EPST,1)+W3STUR)+ & SH**2*(2.*SQMQ/(SH+UH)**2-0.5/(SH+UH))*(PYW2AU(EPST,1)- & PYW2AU(EPSH,1))+0.5*TH*UH/SH*(PYW2AU(EPSH,1)-2.*PYW2AU(EPST,1))+ & 0.125*(SH-12.*SQMQ-4.*TH*UH/SH)*W3TSUR) B2STUI=SQMQ/SQMH**2*(2.*TH*UH*(UH+2.*SH)/(SH+UH)**2* & (PYW1AU(EPST,2)-PYW1AU(EPSH,2))+(SQMQ-SH/4.)* & (0.5*PYW2AU(EPSS,2)+0.5*PYW2AU(EPSH,2)-PYW2AU(EPST,2)+W3STUI)+ & SH**2*(2.*SQMQ/(SH+UH)**2-0.5/(SH+UH))*(PYW2AU(EPST,2)- & PYW2AU(EPSH,2))+0.5*TH*UH/SH*(PYW2AU(EPSH,2)-2.*PYW2AU(EPST,2))+ & 0.125*(SH-12.*SQMQ-4.*TH*UH/SH)*W3TSUI) B2SUTR=SQMQ/SQMH**2*(SH*(TH-SH)/(SH+TH)+2.*UH*TH*(TH+2.*SH)/ & (SH+TH)**2*(PYW1AU(EPSU,1)-PYW1AU(EPSH,1))+(SQMQ-SH/4.)* & (0.5*PYW2AU(EPSS,1)+0.5*PYW2AU(EPSH,1)-PYW2AU(EPSU,1)+W3SUTR)+ & SH**2*(2.*SQMQ/(SH+TH)**2-0.5/(SH+TH))*(PYW2AU(EPSU,1)- & PYW2AU(EPSH,1))+0.5*UH*TH/SH*(PYW2AU(EPSH,1)-2.*PYW2AU(EPSU,1))+ & 0.125*(SH-12.*SQMQ-4.*UH*TH/SH)*W3USTR) B2SUTI=SQMQ/SQMH**2*(2.*UH*TH*(TH+2.*SH)/(SH+TH)**2* & (PYW1AU(EPSU,2)-PYW1AU(EPSH,2))+(SQMQ-SH/4.)* & (0.5*PYW2AU(EPSS,2)+0.5*PYW2AU(EPSH,2)-PYW2AU(EPSU,2)+W3SUTI)+ & SH**2*(2.*SQMQ/(SH+TH)**2-0.5/(SH+TH))*(PYW2AU(EPSU,2)- & PYW2AU(EPSH,2))+0.5*UH*TH/SH*(PYW2AU(EPSH,2)-2.*PYW2AU(EPSU,2))+ & 0.125*(SH-12.*SQMQ-4.*UH*TH/SH)*W3USTI) B2TSUR=SQMQ/SQMH**2*(TH*(UH-TH)/(TH+UH)+2.*SH*UH*(UH+2.*TH)/ & (TH+UH)**2*(PYW1AU(EPSS,1)-PYW1AU(EPSH,1))+(SQMQ-TH/4.)* & (0.5*PYW2AU(EPST,1)+0.5*PYW2AU(EPSH,1)-PYW2AU(EPSS,1)+W3TSUR)+ & TH**2*(2.*SQMQ/(TH+UH)**2-0.5/(TH+UH))*(PYW2AU(EPSS,1)- & PYW2AU(EPSH,1))+0.5*SH*UH/TH*(PYW2AU(EPSH,1)-2.*PYW2AU(EPSS,1))+ & 0.125*(TH-12.*SQMQ-4.*SH*UH/TH)*W3STUR) B2TSUI=SQMQ/SQMH**2*(2.*SH*UH*(UH+2.*TH)/(TH+UH)**2* & (PYW1AU(EPSS,2)-PYW1AU(EPSH,2))+(SQMQ-TH/4.)* & (0.5*PYW2AU(EPST,2)+0.5*PYW2AU(EPSH,2)-PYW2AU(EPSS,2)+W3TSUI)+ & TH**2*(2.*SQMQ/(TH+UH)**2-0.5/(TH+UH))*(PYW2AU(EPSS,2)- & PYW2AU(EPSH,2))+0.5*SH*UH/TH*(PYW2AU(EPSH,2)-2.*PYW2AU(EPSS,2))+ & 0.125*(TH-12.*SQMQ-4.*SH*UH/TH)*W3STUI) B2TUSR=SQMQ/SQMH**2*(TH*(SH-TH)/(TH+SH)+2.*UH*SH*(SH+2.*TH)/ & (TH+SH)**2*(PYW1AU(EPSU,1)-PYW1AU(EPSH,1))+(SQMQ-TH/4.)* & (0.5*PYW2AU(EPST,1)+0.5*PYW2AU(EPSH,1)-PYW2AU(EPSU,1)+W3TUSR)+ & TH**2*(2.*SQMQ/(TH+SH)**2-0.5/(TH+SH))*(PYW2AU(EPSU,1)- & PYW2AU(EPSH,1))+0.5*UH*SH/TH*(PYW2AU(EPSH,1)-2.*PYW2AU(EPSU,1))+ & 0.125*(TH-12.*SQMQ-4.*UH*SH/TH)*W3UTSR) B2TUSI=SQMQ/SQMH**2*(2.*UH*SH*(SH+2.*TH)/(TH+SH)**2* & (PYW1AU(EPSU,2)-PYW1AU(EPSH,2))+(SQMQ-TH/4.)* & (0.5*PYW2AU(EPST,2)+0.5*PYW2AU(EPSH,2)-PYW2AU(EPSU,2)+W3TUSI)+ & TH**2*(2.*SQMQ/(TH+SH)**2-0.5/(TH+SH))*(PYW2AU(EPSU,2)- & PYW2AU(EPSH,2))+0.5*UH*SH/TH*(PYW2AU(EPSH,2)-2.*PYW2AU(EPSU,2))+ & 0.125*(TH-12.*SQMQ-4.*UH*SH/TH)*W3UTSI) B2USTR=SQMQ/SQMH**2*(UH*(TH-UH)/(UH+TH)+2.*SH*TH*(TH+2.*UH)/ & (UH+TH)**2*(PYW1AU(EPSS,1)-PYW1AU(EPSH,1))+(SQMQ-UH/4.)* & (0.5*PYW2AU(EPSU,1)+0.5*PYW2AU(EPSH,1)-PYW2AU(EPSS,1)+W3USTR)+ & UH**2*(2.*SQMQ/(UH+TH)**2-0.5/(UH+TH))*(PYW2AU(EPSS,1)- & PYW2AU(EPSH,1))+0.5*SH*TH/UH*(PYW2AU(EPSH,1)-2.*PYW2AU(EPSS,1))+ & 0.125*(UH-12.*SQMQ-4.*SH*TH/UH)*W3SUTR) B2USTI=SQMQ/SQMH**2*(2.*SH*TH*(TH+2.*UH)/(UH+TH)**2* & (PYW1AU(EPSS,2)-PYW1AU(EPSH,2))+(SQMQ-UH/4.)* & (0.5*PYW2AU(EPSU,2)+0.5*PYW2AU(EPSH,2)-PYW2AU(EPSS,2)+W3USTI)+ & UH**2*(2.*SQMQ/(UH+TH)**2-0.5/(UH+TH))*(PYW2AU(EPSS,2)- & PYW2AU(EPSH,2))+0.5*SH*TH/UH*(PYW2AU(EPSH,2)-2.*PYW2AU(EPSS,2))+ & 0.125*(UH-12.*SQMQ-4.*SH*TH/UH)*W3SUTI) B2UTSR=SQMQ/SQMH**2*(UH*(SH-UH)/(UH+SH)+2.*TH*SH*(SH+2.*UH)/ & (UH+SH)**2*(PYW1AU(EPST,1)-PYW1AU(EPSH,1))+(SQMQ-UH/4.)* & (0.5*PYW2AU(EPSU,1)+0.5*PYW2AU(EPSH,1)-PYW2AU(EPST,1)+W3UTSR)+ & UH**2*(2.*SQMQ/(UH+SH)**2-0.5/(UH+SH))*(PYW2AU(EPST,1)- & PYW2AU(EPSH,1))+0.5*TH*SH/UH*(PYW2AU(EPSH,1)-2.*PYW2AU(EPST,1))+ & 0.125*(UH-12.*SQMQ-4.*TH*SH/UH)*W3TUSR) B2UTSI=SQMQ/SQMH**2*(2.*TH*SH*(SH+2.*UH)/(UH+SH)**2* & (PYW1AU(EPST,2)-PYW1AU(EPSH,2))+(SQMQ-UH/4.)* & (0.5*PYW2AU(EPSU,2)+0.5*PYW2AU(EPSH,2)-PYW2AU(EPST,2)+W3UTSI)+ & UH**2*(2.*SQMQ/(UH+SH)**2-0.5/(UH+SH))*(PYW2AU(EPST,2)- & PYW2AU(EPSH,2))+0.5*TH*SH/UH*(PYW2AU(EPSH,2)-2.*PYW2AU(EPST,2))+ & 0.125*(UH-12.*SQMQ-4.*TH*SH/UH)*W3TUSI) B4STUR=SQMQ/SQMH*(-2./3.+(SQMQ/SQMH-1./4.)*(PYW2AU(EPSS,1)- & PYW2AU(EPSH,1)+W3STUR)) B4STUI=SQMQ/SQMH*(SQMQ/SQMH-1./4.)*(PYW2AU(EPSS,2)- & PYW2AU(EPSH,2)+W3STUI) B4TUSR=SQMQ/SQMH*(-2./3.+(SQMQ/SQMH-1./4.)*(PYW2AU(EPST,1)- & PYW2AU(EPSH,1)+W3TUSR)) B4TUSI=SQMQ/SQMH*(SQMQ/SQMH-1./4.)*(PYW2AU(EPST,2)- & PYW2AU(EPSH,2)+W3TUSI) B4USTR=SQMQ/SQMH*(-2./3.+(SQMQ/SQMH-1./4.)*(PYW2AU(EPSU,1)- & PYW2AU(EPSH,1)+W3USTR)) B4USTI=SQMQ/SQMH*(SQMQ/SQMH-1./4.)*(PYW2AU(EPSU,2)- & PYW2AU(EPSH,2)+W3USTI) A2STUR=A2STUR+B2STUR+B2SUTR A2STUI=A2STUI+B2STUI+B2SUTI A2USTR=A2USTR+B2USTR+B2UTSR A2USTI=A2USTI+B2USTI+B2UTSI A2TUSR=A2TUSR+B2TUSR+B2TSUR A2TUSI=A2TUSI+B2TUSI+B2TSUI A4STUR=A4STUR+B4STUR+B4USTR+B4TUSR A4STUI=A4STUI+B4STUI+B4USTI+B4TUSI 760 CONTINUE FACGH=COMFAC*FACA*3./(128.*PARU(1)**2)*AEM/XW*AS**3* & SQMH/SQMW*SQMH**3/(SH*TH*UH)*(A2STUR**2+A2STUI**2+A2USTR**2+ & A2USTI**2+A2TUSR**2+A2TUSI**2+A4STUR**2+A4STUI**2) FACGH=FACGH*WIDS(25,2) IF(KFAC(1,21)*KFAC(2,21).EQ.0) GOTO 770 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACGH 770 CONTINUE ELSEIF(ISUB.EQ.114) THEN C...g + g -> gamma + gamma. ASRE=0. ASIM=0. DO 780 I=1,2*MSTP(1) EI=KCHG(IABS(I),1)/3. SQMQ=PMAS(I,1)**2 EPSS=4.*SQMQ/SH EPST=4.*SQMQ/TH EPSU=4.*SQMQ/UH A0STUR=1.+(1.+2.*TH/SH)*PYW1AU(EPST,1)+(1.+2.*UH/SH)* & PYW1AU(EPSU,1)+0.5*((TH2+UH2)/SH2-EPSS)*(PYW2AU(EPST,1)+ & PYW2AU(EPSU,1))-0.25*EPST*(1.-0.5*EPSS)*(PYI3AU(EPSS,UH/TH,1)+ & PYI3AU(EPST,UH/SH,1))-0.25*EPSU*(1.-0.5*EPSS)* & (PYI3AU(EPSS,TH/UH,1)+PYI3AU(EPSU,TH/SH,1))+ & 0.25*(-2.*(TH2+UH2)/SH2+4.*EPSS+EPST+EPSU+0.5*EPST*EPSU)* & (PYI3AU(EPST,SH/UH,1)+PYI3AU(EPSU,SH/TH,1)) A0STUI=(1.+2.*TH/SH)*PYW1AU(EPST,2)+(1.+2.*UH/SH)* & PYW1AU(EPSU,2)+0.5*((TH2+UH2)/SH2-EPSS)*(PYW2AU(EPST,2)+ & PYW2AU(EPSU,2))-0.25*EPST*(1.-0.5*EPSS)*(PYI3AU(EPSS,UH/TH,2)+ & PYI3AU(EPST,UH/SH,2))-0.25*EPSU*(1.-0.5*EPSS)* & (PYI3AU(EPSS,TH/UH,2)+PYI3AU(EPSU,TH/SH,2))+ & 0.25*(-2.*(TH2+UH2)/SH2+4.*EPSS+EPST+EPSU+0.5*EPST*EPSU)* & (PYI3AU(EPST,SH/UH,2)+PYI3AU(EPSU,SH/TH,2)) A0TSUR=1.+(1.+2.*SH/TH)*PYW1AU(EPSS,1)+(1.+2.*UH/TH)* & PYW1AU(EPSU,1)+0.5*((SH2+UH2)/TH2-EPST)*(PYW2AU(EPSS,1)+ & PYW2AU(EPSU,1))-0.25*EPSS*(1.-0.5*EPST)*(PYI3AU(EPST,UH/SH,1)+ & PYI3AU(EPSS,UH/TH,1))-0.25*EPSU*(1.-0.5*EPST)* & (PYI3AU(EPST,SH/UH,1)+PYI3AU(EPSU,SH/TH,1))+ & 0.25*(-2.*(SH2+UH2)/TH2+4.*EPST+EPSS+EPSU+0.5*EPSS*EPSU)* & (PYI3AU(EPSS,TH/UH,1)+PYI3AU(EPSU,TH/SH,1)) A0TSUI=(1.+2.*SH/TH)*PYW1AU(EPSS,2)+(1.+2.*UH/TH)* & PYW1AU(EPSU,2)+0.5*((SH2+UH2)/TH2-EPST)*(PYW2AU(EPSS,2)+ & PYW2AU(EPSU,2))-0.25*EPSS*(1.-0.5*EPST)*(PYI3AU(EPST,UH/SH,2)+ & PYI3AU(EPSS,UH/TH,2))-0.25*EPSU*(1.-0.5*EPST)* & (PYI3AU(EPST,SH/UH,2)+PYI3AU(EPSU,SH/TH,2))+ & 0.25*(-2.*(SH2+UH2)/TH2+4.*EPST+EPSS+EPSU+0.5*EPSS*EPSU)* & (PYI3AU(EPSS,TH/UH,2)+PYI3AU(EPSU,TH/SH,2)) A0UTSR=1.+(1.+2.*TH/UH)*PYW1AU(EPST,1)+(1.+2.*SH/UH)* & PYW1AU(EPSS,1)+0.5*((TH2+SH2)/UH2-EPSU)*(PYW2AU(EPST,1)+ & PYW2AU(EPSS,1))-0.25*EPST*(1.-0.5*EPSU)*(PYI3AU(EPSU,SH/TH,1)+ & PYI3AU(EPST,SH/UH,1))-0.25*EPSS*(1.-0.5*EPSU)* & (PYI3AU(EPSU,TH/SH,1)+PYI3AU(EPSS,TH/UH,1))+ & 0.25*(-2.*(TH2+SH2)/UH2+4.*EPSU+EPST+EPSS+0.5*EPST*EPSS)* & (PYI3AU(EPST,UH/SH,1)+PYI3AU(EPSS,UH/TH,1)) A0UTSI=(1.+2.*TH/UH)*PYW1AU(EPST,2)+(1.+2.*SH/UH)* & PYW1AU(EPSS,2)+0.5*((TH2+SH2)/UH2-EPSU)*(PYW2AU(EPST,2)+ & PYW2AU(EPSS,2))-0.25*EPST*(1.-0.5*EPSU)*(PYI3AU(EPSU,SH/TH,2)+ & PYI3AU(EPST,SH/UH,2))-0.25*EPSS*(1.-0.5*EPSU)* & (PYI3AU(EPSU,TH/SH,2)+PYI3AU(EPSS,TH/UH,2))+ & 0.25*(-2.*(TH2+SH2)/UH2+4.*EPSU+EPST+EPSS+0.5*EPST*EPSS)* & (PYI3AU(EPST,UH/SH,2)+PYI3AU(EPSS,UH/TH,2)) A1STUR=-1.-0.25*(EPSS+EPST+EPSU)*(PYW2AU(EPSS,1)+ & PYW2AU(EPST,1)+PYW2AU(EPSU,1))+0.25*(EPSU+0.5*EPSS*EPST)* & (PYI3AU(EPSS,UH/TH,1)+PYI3AU(EPST,UH/SH,1))+ & 0.25*(EPST+0.5*EPSS*EPSU)*(PYI3AU(EPSS,TH/UH,1)+ & PYI3AU(EPSU,TH/SH,1))+0.25*(EPSS+0.5*EPST*EPSU)* & (PYI3AU(EPST,SH/UH,1)+PYI3AU(EPSU,SH/TH,1)) A1STUI=-0.25*(EPSS+EPST+EPSU)*(PYW2AU(EPSS,2)+PYW2AU(EPST,2)+ & PYW2AU(EPSU,2))+0.25*(EPSU+0.5*EPSS*EPST)* & (PYI3AU(EPSS,UH/TH,2)+PYI3AU(EPST,UH/SH,2))+ & 0.25*(EPST+0.5*EPSS*EPSU)*(PYI3AU(EPSS,TH/UH,2)+ & PYI3AU(EPSU,TH/SH,2))+0.25*(EPSS+0.5*EPST*EPSU)* & (PYI3AU(EPST,SH/UH,2)+PYI3AU(EPSU,SH/TH,2)) A2STUR=-1.+0.125*EPSS*EPST*(PYI3AU(EPSS,UH/TH,1)+ & PYI3AU(EPST,UH/SH,1))+0.125*EPSS*EPSU*(PYI3AU(EPSS,TH/UH,1)+ & PYI3AU(EPSU,TH/SH,1))+0.125*EPST*EPSU*(PYI3AU(EPST,SH/UH,1)+ & PYI3AU(EPSU,SH/TH,1)) A2STUI=0.125*EPSS*EPST*(PYI3AU(EPSS,UH/TH,2)+ & PYI3AU(EPST,UH/SH,2))+0.125*EPSS*EPSU*(PYI3AU(EPSS,TH/UH,2)+ & PYI3AU(EPSU,TH/SH,2))+0.125*EPST*EPSU*(PYI3AU(EPST,SH/UH,2)+ & PYI3AU(EPSU,SH/TH,2)) ASRE=ASRE+EI**2*(A0STUR+A0TSUR+A0UTSR+4.*A1STUR+A2STUR) ASIM=ASIM+EI**2*(A0STUI+A0TSUI+A0UTSI+4.*A1STUI+A2STUI) 780 CONTINUE FACGG=COMFAC*FACA/(8.*PARU(1)**2)*AS**2*AEM**2*(ASRE**2+ASIM**2) IF(KFAC(1,21)*KFAC(2,21).EQ.0) GOTO 790 NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACGG 790 CONTINUE ELSEIF(ISUB.EQ.115) THEN C...g + g -> gamma + Z0. ELSEIF(ISUB.EQ.116) THEN C...g + g -> Z0 + Z0. ELSEIF(ISUB.EQ.117) THEN C...g + g -> W+ + W-. ENDIF C...G: 2 -> 3, tree diagrams. ELSEIF(ISUB.LE.140) THEN IF(ISUB.EQ.121) THEN C...g + g -> f + fb + H0. ENDIF C...H: 2 -> 1, tree diagrams, non-standard model processes. ELSEIF(ISUB.LE.160) THEN IF(ISUB.EQ.141) THEN C...f + fb -> gamma*/Z0/Z'0. MINT(61)=2 CALL PYWIDT(32,SQRT(SH),WDTP,WDTE) FACZP=COMFAC*AEM**2*4./9. DO 800 I=MINA,MAXA IF(I.EQ.0.OR.KFAC(1,I)*KFAC(2,-I).EQ.0) GOTO 800 EI=KCHG(IABS(I),1)/3. AI=SIGN(1.,EI) VI=AI-4.*EI*XW API=SIGN(1.,EI) VPI=API-4.*EI*XW NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACZP*(EI**2*VINT(111)+EI*VI/(8.*XW*(1.-XW))* & SH*(SH-SQMZ)/((SH-SQMZ)**2+GMMZ**2)*VINT(112)+EI*VPI/(8.*XW* & (1.-XW))*SH*(SH-SQMZP)/((SH-SQMZP)**2+GMMZP**2)*VINT(113)+ & (VI**2+AI**2)/(16.*XW*(1.-XW))**2*SH2/((SH-SQMZ)**2+GMMZ**2)* & VINT(114)+2.*(VI*VPI+AI*API)/(16.*XW*(1.-XW))**2*SH2* & ((SH-SQMZ)*(SH-SQMZP)+GMMZ*GMMZP)/(((SH-SQMZ)**2+GMMZ**2)* & ((SH-SQMZP)**2+GMMZP**2))*VINT(115)+(VPI**2+API**2)/ & (16.*XW*(1.-XW))**2*SH2/((SH-SQMZP)**2+GMMZP**2)*VINT(116)) 800 CONTINUE ELSEIF(ISUB.EQ.142) THEN C...f + fb' -> H+/-. CALL PYWIDT(37,SQRT(SH),WDTP,WDTE) FHC=COMFAC*(AEM/XW)**2*1./48.*(SH/SQMW)**2*SH2/ & ((SH-SQMHC)**2+GMMHC**2) C'''No construction yet for leptons DO 840 I=1,MSTP(54)/2 IL=2*I-1 IU=2*I RMQL=PMAS(IL,1)**2/SH RMQU=PMAS(IU,1)**2/SH IF(SQRT(RMQL)+SQRT(RMQU).GE.1.) GOTO 840 FACHC=FHC*((RMQL*PARU(121)+RMQU/PARU(121))*(1.-RMQL-RMQU)- & 4.*RMQL*RMQU)*SQRT(MAX(0.,(1.-RMQL-RMQU)**2-4.*RMQL*RMQU)) IF(KFAC(1,IL)*KFAC(2,-IU).EQ.0) GOTO 810 KCHHC=(KCHG(IL,1)-KCHG(IU,1))/3 NCHN=NCHN+1 ISIG(NCHN,1)=IL ISIG(NCHN,2)=-IU ISIG(NCHN,3)=1 SIGH(NCHN)=FACHC*(WDTE(0,1)+WDTE(0,(5-KCHHC)/2)+WDTE(0,4)) 810 IF(KFAC(1,-IL)*KFAC(2,IU).EQ.0) GOTO 820 KCHHC=(-KCHG(IL,1)+KCHG(IU,1))/3 NCHN=NCHN+1 ISIG(NCHN,1)=-IL ISIG(NCHN,2)=IU ISIG(NCHN,3)=1 SIGH(NCHN)=FACHC*(WDTE(0,1)+WDTE(0,(5-KCHHC)/2)+WDTE(0,4)) 820 IF(KFAC(1,IU)*KFAC(2,-IL).EQ.0) GOTO 830 KCHHC=(KCHG(IU,1)-KCHG(IL,1))/3 NCHN=NCHN+1 ISIG(NCHN,1)=IU ISIG(NCHN,2)=-IL ISIG(NCHN,3)=1 SIGH(NCHN)=FACHC*(WDTE(0,1)+WDTE(0,(5-KCHHC)/2)+WDTE(0,4)) 830 IF(KFAC(1,-IU)*KFAC(2,IL).EQ.0) GOTO 840 KCHHC=(-KCHG(IU,1)+KCHG(IL,1))/3 NCHN=NCHN+1 ISIG(NCHN,1)=-IU ISIG(NCHN,2)=IL ISIG(NCHN,3)=1 SIGH(NCHN)=FACHC*(WDTE(0,1)+WDTE(0,(5-KCHHC)/2)+WDTE(0,4)) 840 CONTINUE ELSEIF(ISUB.EQ.143) THEN C...f + fb -> R. CALL PYWIDT(40,SQRT(SH),WDTP,WDTE) FACR=COMFAC*(AEM/XW)**2*1./9.*SH2/((SH-SQMR)**2+GMMR**2) DO 860 I=MIN1,MAX1 IF(I.EQ.0.OR.KFAC(1,I).EQ.0) GOTO 860 IA=IABS(I) DO 850 J=MIN2,MAX2 IF(J.EQ.0.OR.KFAC(2,J).EQ.0) GOTO 850 JA=IABS(J) IF(I*J.GT.0.OR.IABS(IA-JA).NE.2) GOTO 850 NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=J ISIG(NCHN,3)=1 SIGH(NCHN)=FACR*(WDTE(0,1)+WDTE(0,(10-(I+J))/4)+WDTE(0,4)) 850 CONTINUE 860 CONTINUE ENDIF C...I: 2 -> 2, tree diagrams, non-standard model processes. ELSE IF(ISUB.EQ.161) THEN C...f + g -> f' + H+/- (q + g -> q' + H+/- only). FHCQ=COMFAC*FACA*AS*AEM/XW*1./24 DO 900 I=1,MSTP(54) IU=I+MOD(I,2) SQMQ=PMAS(IU,1)**2 FACHCQ=FHCQ/PARU(121)*SQMQ/SQMW*(SH/(SQMQ-UH)+ & 2.*SQMQ*(SQMHC-UH)/(SQMQ-UH)**2+(SQMQ-UH)/SH+ & 2.*SQMQ/(SQMQ-UH)+2.*(SQMHC-UH)/(SQMQ-UH)*(SQMHC-SQMQ-SH)/SH) IF(KFAC(1,-I)*KFAC(2,21).EQ.0) GOTO 870 KCHHC=ISIGN(1,-KCHG(I,1)) NCHN=NCHN+1 ISIG(NCHN,1)=-I ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACHCQ*WIDS(37,(5-KCHHC)/2) 870 IF(KFAC(1,I)*KFAC(2,21).EQ.0) GOTO 880 KCHHC=ISIGN(1,KCHG(I,1)) NCHN=NCHN+1 ISIG(NCHN,1)=I ISIG(NCHN,2)=21 ISIG(NCHN,3)=1 SIGH(NCHN)=FACHCQ*WIDS(37,(5-KCHHC)/2) 880 IF(KFAC(1,21)*KFAC(2,-I).EQ.0) GOTO 890 KCHHC=ISIGN(1,-KCHG(I,1)) NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=-I ISIG(NCHN,3)=1 SIGH(NCHN)=FACHCQ*WIDS(37,(5-KCHHC)/2) 890 IF(KFAC(1,21)*KFAC(2,I).EQ.0) GOTO 900 KCHHC=ISIGN(1,KCHG(I,1)) NCHN=NCHN+1 ISIG(NCHN,1)=21 ISIG(NCHN,2)=I ISIG(NCHN,3)=1 SIGH(NCHN)=FACHCQ*WIDS(37,(5-KCHHC)/2) 900 CONTINUE ENDIF ENDIF C...Multiply with structure functions. IF(ISUB.LE.90.OR.ISUB.GE.96) THEN DO 910 ICHN=1,NCHN IF(MINT(41).EQ.2) THEN KFL1=ISIG(ICHN,1) IF(KFL1.EQ.21) KFL1=0 SIGH(ICHN)=SIGH(ICHN)*XSFX(1,KFL1) ENDIF IF(MINT(42).EQ.2) THEN KFL2=ISIG(ICHN,2) IF(KFL2.EQ.21) KFL2=0 SIGH(ICHN)=SIGH(ICHN)*XSFX(2,KFL2) ENDIF 910 SIGS=SIGS+SIGH(ICHN) ENDIF RETURN END C********************************************************************* SUBROUTINE PYSTFU(KF,X,Q2,XPQ) C...Gives proton and pi+ parton structure functions according to a few C...different parametrizations. Note that what is coded is x times the C...probability distribution, i.e. xq(x,Q2) etc. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) SAVE /LUDAT1/,/LUDAT2/ SAVE /PYPARS/,/PYINT1/ DIMENSION XPQ(-6:6),XQ(8),TX(6),TT(6),TS(6),NEHLQ(8,2), &CEHLQ(6,6,2,8,2),CDO(3,6,5,2),COW(3,5,4,2),CMT1(12,8) C...The following data lines are coefficients needed in the C...Eichten, Hinchliffe, Lane, Quigg proton structure function C...parametrizations, see below. C...Powers of 1-x in different cases. DATA NEHLQ/3,4,7,5,7,7,7,7,3,4,7,6,7,7,7,7/ C...Expansion coefficients for up valence quark distribution. DATA (((CEHLQ(IX,IT,NX,1,1),IX=1,6),IT=1,6),NX=1,2)/ 1 7.677E-01,-2.087E-01,-3.303E-01,-2.517E-02,-1.570E-02,-1.000E-04, 2-5.326E-01,-2.661E-01, 3.201E-01, 1.192E-01, 2.434E-02, 7.620E-03, 3 2.162E-01, 1.881E-01,-8.375E-02,-6.515E-02,-1.743E-02,-5.040E-03, 4-9.211E-02,-9.952E-02, 1.373E-02, 2.506E-02, 8.770E-03, 2.550E-03, 5 3.670E-02, 4.409E-02, 9.600E-04,-7.960E-03,-3.420E-03,-1.050E-03, 6-1.549E-02,-2.026E-02,-3.060E-03, 2.220E-03, 1.240E-03, 4.100E-04, 1 2.395E-01, 2.905E-01, 9.778E-02, 2.149E-02, 3.440E-03, 5.000E-04, 2 1.751E-02,-6.090E-03,-2.687E-02,-1.916E-02,-7.970E-03,-2.750E-03, 3-5.760E-03,-5.040E-03, 1.080E-03, 2.490E-03, 1.530E-03, 7.500E-04, 4 1.740E-03, 1.960E-03, 3.000E-04,-3.400E-04,-2.900E-04,-1.800E-04, 5-5.300E-04,-6.400E-04,-1.700E-04, 4.000E-05, 6.000E-05, 4.000E-05, 6 1.700E-04, 2.200E-04, 8.000E-05, 1.000E-05,-1.000E-05,-1.000E-05/ DATA (((CEHLQ(IX,IT,NX,1,2),IX=1,6),IT=1,6),NX=1,2)/ 1 7.237E-01,-2.189E-01,-2.995E-01,-1.909E-02,-1.477E-02, 2.500E-04, 2-5.314E-01,-2.425E-01, 3.283E-01, 1.119E-01, 2.223E-02, 7.070E-03, 3 2.289E-01, 1.890E-01,-9.859E-02,-6.900E-02,-1.747E-02,-5.080E-03, 4-1.041E-01,-1.084E-01, 2.108E-02, 2.975E-02, 9.830E-03, 2.830E-03, 5 4.394E-02, 5.116E-02,-1.410E-03,-1.055E-02,-4.230E-03,-1.270E-03, 6-1.991E-02,-2.539E-02,-2.780E-03, 3.430E-03, 1.720E-03, 5.500E-04, 1 2.410E-01, 2.884E-01, 9.369E-02, 1.900E-02, 2.530E-03, 2.400E-04, 2 1.765E-02,-9.220E-03,-3.037E-02,-2.085E-02,-8.440E-03,-2.810E-03, 3-6.450E-03,-5.260E-03, 1.720E-03, 3.110E-03, 1.830E-03, 8.700E-04, 4 2.120E-03, 2.320E-03, 2.600E-04,-4.900E-04,-3.900E-04,-2.300E-04, 5-6.900E-04,-8.200E-04,-2.000E-04, 7.000E-05, 9.000E-05, 6.000E-05, 6 2.400E-04, 3.100E-04, 1.100E-04, 0.000E+00,-2.000E-05,-2.000E-05/ C...Expansion coefficients for down valence quark distribution. DATA (((CEHLQ(IX,IT,NX,2,1),IX=1,6),IT=1,6),NX=1,2)/ 1 3.813E-01,-8.090E-02,-1.634E-01,-2.185E-02,-8.430E-03,-6.200E-04, 2-2.948E-01,-1.435E-01, 1.665E-01, 6.638E-02, 1.473E-02, 4.080E-03, 3 1.252E-01, 1.042E-01,-4.722E-02,-3.683E-02,-1.038E-02,-2.860E-03, 4-5.478E-02,-5.678E-02, 8.900E-03, 1.484E-02, 5.340E-03, 1.520E-03, 5 2.220E-02, 2.567E-02,-3.000E-05,-4.970E-03,-2.160E-03,-6.500E-04, 6-9.530E-03,-1.204E-02,-1.510E-03, 1.510E-03, 8.300E-04, 2.700E-04, 1 1.261E-01, 1.354E-01, 3.958E-02, 8.240E-03, 1.660E-03, 4.500E-04, 2 3.890E-03,-1.159E-02,-1.625E-02,-9.610E-03,-3.710E-03,-1.260E-03, 3-1.910E-03,-5.600E-04, 1.590E-03, 1.590E-03, 8.400E-04, 3.900E-04, 4 6.400E-04, 4.900E-04,-1.500E-04,-2.900E-04,-1.800E-04,-1.000E-04, 5-2.000E-04,-1.900E-04, 0.000E+00, 6.000E-05, 4.000E-05, 3.000E-05, 6 7.000E-05, 8.000E-05, 2.000E-05,-1.000E-05,-1.000E-05,-1.000E-05/ DATA (((CEHLQ(IX,IT,NX,2,2),IX=1,6),IT=1,6),NX=1,2)/ 1 3.578E-01,-8.622E-02,-1.480E-01,-1.840E-02,-7.820E-03,-4.500E-04, 2-2.925E-01,-1.304E-01, 1.696E-01, 6.243E-02, 1.353E-02, 3.750E-03, 3 1.318E-01, 1.041E-01,-5.486E-02,-3.872E-02,-1.038E-02,-2.850E-03, 4-6.162E-02,-6.143E-02, 1.303E-02, 1.740E-02, 5.940E-03, 1.670E-03, 5 2.643E-02, 2.957E-02,-1.490E-03,-6.450E-03,-2.630E-03,-7.700E-04, 6-1.218E-02,-1.497E-02,-1.260E-03, 2.240E-03, 1.120E-03, 3.500E-04, 1 1.263E-01, 1.334E-01, 3.732E-02, 7.070E-03, 1.260E-03, 3.400E-04, 2 3.660E-03,-1.357E-02,-1.795E-02,-1.031E-02,-3.880E-03,-1.280E-03, 3-2.100E-03,-3.600E-04, 2.050E-03, 1.920E-03, 9.800E-04, 4.400E-04, 4 7.700E-04, 5.400E-04,-2.400E-04,-3.900E-04,-2.400E-04,-1.300E-04, 5-2.600E-04,-2.300E-04, 2.000E-05, 9.000E-05, 6.000E-05, 4.000E-05, 6 9.000E-05, 1.000E-04, 2.000E-05,-2.000E-05,-2.000E-05,-1.000E-05/ C...Expansion coefficients for up and down sea quark distributions. DATA (((CEHLQ(IX,IT,NX,3,1),IX=1,6),IT=1,6),NX=1,2)/ 1 6.870E-02,-6.861E-02, 2.973E-02,-5.400E-03, 3.780E-03,-9.700E-04, 2-1.802E-02, 1.400E-04, 6.490E-03,-8.540E-03, 1.220E-03,-1.750E-03, 3-4.650E-03, 1.480E-03,-5.930E-03, 6.000E-04,-1.030E-03,-8.000E-05, 4 6.440E-03, 2.570E-03, 2.830E-03, 1.150E-03, 7.100E-04, 3.300E-04, 5-3.930E-03,-2.540E-03,-1.160E-03,-7.700E-04,-3.600E-04,-1.900E-04, 6 2.340E-03, 1.930E-03, 5.300E-04, 3.700E-04, 1.600E-04, 9.000E-05, 1 1.014E+00,-1.106E+00, 3.374E-01,-7.444E-02, 8.850E-03,-8.700E-04, 2 9.233E-01,-1.285E+00, 4.475E-01,-9.786E-02, 1.419E-02,-1.120E-03, 3 4.888E-02,-1.271E-01, 8.606E-02,-2.608E-02, 4.780E-03,-6.000E-04, 4-2.691E-02, 4.887E-02,-1.771E-02, 1.620E-03, 2.500E-04,-6.000E-05, 5 7.040E-03,-1.113E-02, 1.590E-03, 7.000E-04,-2.000E-04, 0.000E+00, 6-1.710E-03, 2.290E-03, 3.800E-04,-3.500E-04, 4.000E-05, 1.000E-05/ DATA (((CEHLQ(IX,IT,NX,3,2),IX=1,6),IT=1,6),NX=1,2)/ 1 1.008E-01,-7.100E-02, 1.973E-02,-5.710E-03, 2.930E-03,-9.900E-04, 2-5.271E-02,-1.823E-02, 1.792E-02,-6.580E-03, 1.750E-03,-1.550E-03, 3 1.220E-02, 1.763E-02,-8.690E-03,-8.800E-04,-1.160E-03,-2.100E-04, 4-1.190E-03,-7.180E-03, 2.360E-03, 1.890E-03, 7.700E-04, 4.100E-04, 5-9.100E-04, 2.040E-03,-3.100E-04,-1.050E-03,-4.000E-04,-2.400E-04, 6 1.190E-03,-1.700E-04,-2.000E-04, 4.200E-04, 1.700E-04, 1.000E-04, 1 1.081E+00,-1.189E+00, 3.868E-01,-8.617E-02, 1.115E-02,-1.180E-03, 2 9.917E-01,-1.396E+00, 4.998E-01,-1.159E-01, 1.674E-02,-1.720E-03, 3 5.099E-02,-1.338E-01, 9.173E-02,-2.885E-02, 5.890E-03,-6.500E-04, 4-3.178E-02, 5.703E-02,-2.070E-02, 2.440E-03, 1.100E-04,-9.000E-05, 5 8.970E-03,-1.392E-02, 2.050E-03, 6.500E-04,-2.300E-04, 2.000E-05, 6-2.340E-03, 3.010E-03, 5.000E-04,-3.900E-04, 6.000E-05, 1.000E-05/ C...Expansion coefficients for gluon distribution. DATA (((CEHLQ(IX,IT,NX,4,1),IX=1,6),IT=1,6),NX=1,2)/ 1 9.482E-01,-9.578E-01, 1.009E-01,-1.051E-01, 3.456E-02,-3.054E-02, 2-9.627E-01, 5.379E-01, 3.368E-01,-9.525E-02, 1.488E-02,-2.051E-02, 3 4.300E-01,-8.306E-02,-3.372E-01, 4.902E-02,-9.160E-03, 1.041E-02, 4-1.925E-01,-1.790E-02, 2.183E-01, 7.490E-03, 4.140E-03,-1.860E-03, 5 8.183E-02, 1.926E-02,-1.072E-01,-1.944E-02,-2.770E-03,-5.200E-04, 6-3.884E-02,-1.234E-02, 5.410E-02, 1.879E-02, 3.350E-03, 1.040E-03, 1 2.948E+01,-3.902E+01, 1.464E+01,-3.335E+00, 5.054E-01,-5.915E-02, 2 2.559E+01,-3.955E+01, 1.661E+01,-4.299E+00, 6.904E-01,-8.243E-02, 3-1.663E+00, 1.176E+00, 1.118E+00,-7.099E-01, 1.948E-01,-2.404E-02, 4-2.168E-01, 8.170E-01,-7.169E-01, 1.851E-01,-1.924E-02,-3.250E-03, 5 2.088E-01,-4.355E-01, 2.239E-01,-2.446E-02,-3.620E-03, 1.910E-03, 6-9.097E-02, 1.601E-01,-5.681E-02,-2.500E-03, 2.580E-03,-4.700E-04/ DATA (((CEHLQ(IX,IT,NX,4,2),IX=1,6),IT=1,6),NX=1,2)/ 1 2.367E+00, 4.453E-01, 3.660E-01, 9.467E-02, 1.341E-01, 1.661E-02, 2-3.170E+00,-1.795E+00, 3.313E-02,-2.874E-01,-9.827E-02,-7.119E-02, 3 1.823E+00, 1.457E+00,-2.465E-01, 3.739E-02, 6.090E-03, 1.814E-02, 4-1.033E+00,-9.827E-01, 2.136E-01, 1.169E-01, 5.001E-02, 1.684E-02, 5 5.133E-01, 5.259E-01,-1.173E-01,-1.139E-01,-4.988E-02,-2.021E-02, 6-2.881E-01,-3.145E-01, 5.667E-02, 9.161E-02, 4.568E-02, 1.951E-02, 1 3.036E+01,-4.062E+01, 1.578E+01,-3.699E+00, 6.020E-01,-7.031E-02, 2 2.700E+01,-4.167E+01, 1.770E+01,-4.804E+00, 7.862E-01,-1.060E-01, 3-1.909E+00, 1.357E+00, 1.127E+00,-7.181E-01, 2.232E-01,-2.481E-02, 4-2.488E-01, 9.781E-01,-8.127E-01, 2.094E-01,-2.997E-02,-4.710E-03, 5 2.506E-01,-5.427E-01, 2.672E-01,-3.103E-02,-1.800E-03, 2.870E-03, 6-1.128E-01, 2.087E-01,-6.972E-02,-2.480E-03, 2.630E-03,-8.400E-04/ C...Expansion coefficients for strange sea quark distribution. DATA (((CEHLQ(IX,IT,NX,5,1),IX=1,6),IT=1,6),NX=1,2)/ 1 4.968E-02,-4.173E-02, 2.102E-02,-3.270E-03, 3.240E-03,-6.700E-04, 2-6.150E-03,-1.294E-02, 6.740E-03,-6.890E-03, 9.000E-04,-1.510E-03, 3-8.580E-03, 5.050E-03,-4.900E-03,-1.600E-04,-9.400E-04,-1.500E-04, 4 7.840E-03, 1.510E-03, 2.220E-03, 1.400E-03, 7.000E-04, 3.500E-04, 5-4.410E-03,-2.220E-03,-8.900E-04,-8.500E-04,-3.600E-04,-2.000E-04, 6 2.520E-03, 1.840E-03, 4.100E-04, 3.900E-04, 1.600E-04, 9.000E-05, 1 9.235E-01,-1.085E+00, 3.464E-01,-7.210E-02, 9.140E-03,-9.100E-04, 2 9.315E-01,-1.274E+00, 4.512E-01,-9.775E-02, 1.380E-02,-1.310E-03, 3 4.739E-02,-1.296E-01, 8.482E-02,-2.642E-02, 4.760E-03,-5.700E-04, 4-2.653E-02, 4.953E-02,-1.735E-02, 1.750E-03, 2.800E-04,-6.000E-05, 5 6.940E-03,-1.132E-02, 1.480E-03, 6.500E-04,-2.100E-04, 0.000E+00, 6-1.680E-03, 2.340E-03, 4.200E-04,-3.400E-04, 5.000E-05, 1.000E-05/ DATA (((CEHLQ(IX,IT,NX,5,2),IX=1,6),IT=1,6),NX=1,2)/ 1 6.478E-02,-4.537E-02, 1.643E-02,-3.490E-03, 2.710E-03,-6.700E-04, 2-2.223E-02,-2.126E-02, 1.247E-02,-6.290E-03, 1.120E-03,-1.440E-03, 3-1.340E-03, 1.362E-02,-6.130E-03,-7.900E-04,-9.000E-04,-2.000E-04, 4 5.080E-03,-3.610E-03, 1.700E-03, 1.830E-03, 6.800E-04, 4.000E-04, 5-3.580E-03, 6.000E-05,-2.600E-04,-1.050E-03,-3.800E-04,-2.300E-04, 6 2.420E-03, 9.300E-04,-1.000E-04, 4.500E-04, 1.700E-04, 1.100E-04, 1 9.868E-01,-1.171E+00, 3.940E-01,-8.459E-02, 1.124E-02,-1.250E-03, 2 1.001E+00,-1.383E+00, 5.044E-01,-1.152E-01, 1.658E-02,-1.830E-03, 3 4.928E-02,-1.368E-01, 9.021E-02,-2.935E-02, 5.800E-03,-6.600E-04, 4-3.133E-02, 5.785E-02,-2.023E-02, 2.630E-03, 1.600E-04,-8.000E-05, 5 8.840E-03,-1.416E-02, 1.900E-03, 5.800E-04,-2.500E-04, 1.000E-05, 6-2.300E-03, 3.080E-03, 5.500E-04,-3.700E-04, 7.000E-05, 1.000E-05/ C...Expansion coefficients for charm sea quark distribution. DATA (((CEHLQ(IX,IT,NX,6,1),IX=1,6),IT=1,6),NX=1,2)/ 1 9.270E-03,-1.817E-02, 9.590E-03,-6.390E-03, 1.690E-03,-1.540E-03, 2 5.710E-03,-1.188E-02, 6.090E-03,-4.650E-03, 1.240E-03,-1.310E-03, 3-3.960E-03, 7.100E-03,-3.590E-03, 1.840E-03,-3.900E-04, 3.400E-04, 4 1.120E-03,-1.960E-03, 1.120E-03,-4.800E-04, 1.000E-04,-4.000E-05, 5 4.000E-05,-3.000E-05,-1.800E-04, 9.000E-05,-5.000E-05,-2.000E-05, 6-4.200E-04, 7.300E-04,-1.600E-04, 5.000E-05, 5.000E-05, 5.000E-05, 1 8.098E-01,-1.042E+00, 3.398E-01,-6.824E-02, 8.760E-03,-9.000E-04, 2 8.961E-01,-1.217E+00, 4.339E-01,-9.287E-02, 1.304E-02,-1.290E-03, 3 3.058E-02,-1.040E-01, 7.604E-02,-2.415E-02, 4.600E-03,-5.000E-04, 4-2.451E-02, 4.432E-02,-1.651E-02, 1.430E-03, 1.200E-04,-1.000E-04, 5 1.122E-02,-1.457E-02, 2.680E-03, 5.800E-04,-1.200E-04, 3.000E-05, 6-7.730E-03, 7.330E-03,-7.600E-04,-2.400E-04, 1.000E-05, 0.000E+00/ DATA (((CEHLQ(IX,IT,NX,6,2),IX=1,6),IT=1,6),NX=1,2)/ 1 9.980E-03,-1.945E-02, 1.055E-02,-6.870E-03, 1.860E-03,-1.560E-03, 2 5.700E-03,-1.203E-02, 6.250E-03,-4.860E-03, 1.310E-03,-1.370E-03, 3-4.490E-03, 7.990E-03,-4.170E-03, 2.050E-03,-4.400E-04, 3.300E-04, 4 1.470E-03,-2.480E-03, 1.460E-03,-5.700E-04, 1.200E-04,-1.000E-05, 5-9.000E-05, 1.500E-04,-3.200E-04, 1.200E-04,-6.000E-05,-4.000E-05, 6-4.200E-04, 7.600E-04,-1.400E-04, 4.000E-05, 7.000E-05, 5.000E-05, 1 8.698E-01,-1.131E+00, 3.836E-01,-8.111E-02, 1.048E-02,-1.300E-03, 2 9.626E-01,-1.321E+00, 4.854E-01,-1.091E-01, 1.583E-02,-1.700E-03, 3 3.057E-02,-1.088E-01, 8.022E-02,-2.676E-02, 5.590E-03,-5.600E-04, 4-2.845E-02, 5.164E-02,-1.918E-02, 2.210E-03,-4.000E-05,-1.500E-04, 5 1.311E-02,-1.751E-02, 3.310E-03, 5.100E-04,-1.200E-04, 5.000E-05, 6-8.590E-03, 8.380E-03,-9.200E-04,-2.600E-04, 1.000E-05,-1.000E-05/ C...Expansion coefficients for bottom sea quark distribution. DATA (((CEHLQ(IX,IT,NX,7,1),IX=1,6),IT=1,6),NX=1,2)/ 1 9.010E-03,-1.401E-02, 7.150E-03,-4.130E-03, 1.260E-03,-1.040E-03, 2 6.280E-03,-9.320E-03, 4.780E-03,-2.890E-03, 9.100E-04,-8.200E-04, 3-2.930E-03, 4.090E-03,-1.890E-03, 7.600E-04,-2.300E-04, 1.400E-04, 4 3.900E-04,-1.200E-03, 4.400E-04,-2.500E-04, 2.000E-05,-2.000E-05, 5 2.600E-04, 1.400E-04,-8.000E-05, 1.000E-04, 1.000E-05, 1.000E-05, 6-2.600E-04, 3.200E-04, 1.000E-05,-1.000E-05, 1.000E-05,-1.000E-05, 1 8.029E-01,-1.075E+00, 3.792E-01,-7.843E-02, 1.007E-02,-1.090E-03, 2 7.903E-01,-1.099E+00, 4.153E-01,-9.301E-02, 1.317E-02,-1.410E-03, 3-1.704E-02,-1.130E-02, 2.882E-02,-1.341E-02, 3.040E-03,-3.600E-04, 4-7.200E-04, 7.230E-03,-5.160E-03, 1.080E-03,-5.000E-05,-4.000E-05, 5 3.050E-03,-4.610E-03, 1.660E-03,-1.300E-04,-1.000E-05, 1.000E-05, 6-4.360E-03, 5.230E-03,-1.610E-03, 2.000E-04,-2.000E-05, 0.000E+00/ DATA (((CEHLQ(IX,IT,NX,7,2),IX=1,6),IT=1,6),NX=1,2)/ 1 8.980E-03,-1.459E-02, 7.510E-03,-4.410E-03, 1.310E-03,-1.070E-03, 2 5.970E-03,-9.440E-03, 4.800E-03,-3.020E-03, 9.100E-04,-8.500E-04, 3-3.050E-03, 4.440E-03,-2.100E-03, 8.500E-04,-2.400E-04, 1.400E-04, 4 5.300E-04,-1.300E-03, 5.600E-04,-2.700E-04, 3.000E-05,-2.000E-05, 5 2.000E-04, 1.400E-04,-1.100E-04, 1.000E-04, 0.000E+00, 0.000E+00, 6-2.600E-04, 3.200E-04, 0.000E+00,-3.000E-05, 1.000E-05,-1.000E-05, 1 8.672E-01,-1.174E+00, 4.265E-01,-9.252E-02, 1.244E-02,-1.460E-03, 2 8.500E-01,-1.194E+00, 4.630E-01,-1.083E-01, 1.614E-02,-1.830E-03, 3-2.241E-02,-5.630E-03, 2.815E-02,-1.425E-02, 3.520E-03,-4.300E-04, 4-7.300E-04, 8.030E-03,-5.780E-03, 1.380E-03,-1.300E-04,-4.000E-05, 5 3.460E-03,-5.380E-03, 1.960E-03,-2.100E-04, 1.000E-05, 1.000E-05, 6-4.850E-03, 5.950E-03,-1.890E-03, 2.600E-04,-3.000E-05, 0.000E+00/ C...Expansion coefficients for top sea quark distribution. DATA (((CEHLQ(IX,IT,NX,8,1),IX=1,6),IT=1,6),NX=1,2)/ 1 4.410E-03,-7.480E-03, 3.770E-03,-2.580E-03, 7.300E-04,-7.100E-04, 2 3.840E-03,-6.050E-03, 3.030E-03,-2.030E-03, 5.800E-04,-5.900E-04, 3-8.800E-04, 1.660E-03,-7.500E-04, 4.700E-04,-1.000E-04, 1.000E-04, 4-8.000E-05,-1.500E-04, 1.200E-04,-9.000E-05, 3.000E-05, 0.000E+00, 5 1.300E-04,-2.200E-04,-2.000E-05,-2.000E-05,-2.000E-05,-2.000E-05, 6-7.000E-05, 1.900E-04,-4.000E-05, 2.000E-05, 0.000E+00, 0.000E+00, 1 6.623E-01,-9.248E-01, 3.519E-01,-7.930E-02, 1.110E-02,-1.180E-03, 2 6.380E-01,-9.062E-01, 3.582E-01,-8.479E-02, 1.265E-02,-1.390E-03, 3-2.581E-02, 2.125E-02, 4.190E-03,-4.980E-03, 1.490E-03,-2.100E-04, 4 7.100E-04, 5.300E-04,-1.270E-03, 3.900E-04,-5.000E-05,-1.000E-05, 5 3.850E-03,-5.060E-03, 1.860E-03,-3.500E-04, 4.000E-05, 0.000E+00, 6-3.530E-03, 4.460E-03,-1.500E-03, 2.700E-04,-3.000E-05, 0.000E+00/ DATA (((CEHLQ(IX,IT,NX,8,2),IX=1,6),IT=1,6),NX=1,2)/ 1 4.260E-03,-7.530E-03, 3.830E-03,-2.680E-03, 7.600E-04,-7.300E-04, 2 3.640E-03,-6.050E-03, 3.030E-03,-2.090E-03, 5.900E-04,-6.000E-04, 3-9.200E-04, 1.710E-03,-8.200E-04, 5.000E-04,-1.200E-04, 1.000E-04, 4-5.000E-05,-1.600E-04, 1.300E-04,-9.000E-05, 3.000E-05, 0.000E+00, 5 1.300E-04,-2.100E-04,-1.000E-05,-2.000E-05,-2.000E-05,-1.000E-05, 6-8.000E-05, 1.800E-04,-5.000E-05, 2.000E-05, 0.000E+00, 0.000E+00, 1 7.146E-01,-1.007E+00, 3.932E-01,-9.246E-02, 1.366E-02,-1.540E-03, 2 6.856E-01,-9.828E-01, 3.977E-01,-9.795E-02, 1.540E-02,-1.790E-03, 3-3.053E-02, 2.758E-02, 2.150E-03,-4.880E-03, 1.640E-03,-2.500E-04, 4 9.200E-04, 4.200E-04,-1.340E-03, 4.600E-04,-8.000E-05,-1.000E-05, 5 4.230E-03,-5.660E-03, 2.140E-03,-4.300E-04, 6.000E-05, 0.000E+00, 6-3.890E-03, 5.000E-03,-1.740E-03, 3.300E-04,-4.000E-05, 0.000E+00/ C...The following data lines are coefficients needed in the C...Duke, Owens proton structure function parametrizations, see below. C...Expansion coefficients for (up+down) valence quark distribution. DATA ((CDO(IP,IS,1,1),IS=1,6),IP=1,3)/ 1 4.190E-01, 3.460E+00, 4.400E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2 4.000E-03, 7.240E-01,-4.860E+00, 0.000E+00, 0.000E+00, 0.000E+00, 3-7.000E-03,-6.600E-02, 1.330E+00, 0.000E+00, 0.000E+00, 0.000E+00/ DATA ((CDO(IP,IS,1,2),IS=1,6),IP=1,3)/ 1 3.740E-01, 3.330E+00, 6.030E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2 1.400E-02, 7.530E-01,-6.220E+00, 0.000E+00, 0.000E+00, 0.000E+00, 3 0.000E+00,-7.600E-02, 1.560E+00, 0.000E+00, 0.000E+00, 0.000E+00/ C...Expansion coefficients for down valence quark distribution. DATA ((CDO(IP,IS,2,1),IS=1,6),IP=1,3)/ 1 7.630E-01, 4.000E+00, 0.000E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2-2.370E-01, 6.270E-01,-4.210E-01, 0.000E+00, 0.000E+00, 0.000E+00, 3 2.600E-02,-1.900E-02, 3.300E-02, 0.000E+00, 0.000E+00, 0.000E+00/ DATA ((CDO(IP,IS,2,2),IS=1,6),IP=1,3)/ 1 7.610E-01, 3.830E+00, 0.000E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2-2.320E-01, 6.270E-01,-4.180E-01, 0.000E+00, 0.000E+00, 0.000E+00, 3 2.300E-02,-1.900E-02, 3.600E-02, 0.000E+00, 0.000E+00, 0.000E+00/ C...Expansion coefficients for (up+down+strange) sea quark distribution. DATA ((CDO(IP,IS,3,1),IS=1,6),IP=1,3)/ 1 1.265E+00, 0.000E+00, 8.050E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2-1.132E+00,-3.720E-01, 1.590E+00, 6.310E+00,-1.050E+01, 1.470E+01, 3 2.930E-01,-2.900E-02,-1.530E-01,-2.730E-01,-3.170E+00, 9.800E+00/ DATA ((CDO(IP,IS,3,2),IS=1,6),IP=1,3)/ 1 1.670E+00, 0.000E+00, 9.150E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2-1.920E+00,-2.730E-01, 5.300E-01, 1.570E+01,-1.010E+02, 2.230E+02, 3 5.820E-01,-1.640E-01,-7.630E-01,-2.830E+00, 4.470E+01,-1.170E+02/ C...Expansion coefficients for charm sea quark distribution. DATA ((CDO(IP,IS,4,1),IS=1,6),IP=1,3)/ 1 0.000E+00,-3.600E-02, 6.350E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2 1.350E-01,-2.220E-01, 3.260E+00,-3.030E+00, 1.740E+01,-1.790E+01, 3-7.500E-02,-5.800E-02,-9.090E-01, 1.500E+00,-1.130E+01, 1.560E+01/ DATA ((CDO(IP,IS,4,2),IS=1,6),IP=1,3)/ 1 0.000E+00,-1.200E-01, 3.510E+00, 0.000E+00, 0.000E+00, 0.000E+00, 2 6.700E-02,-2.330E-01, 3.660E+00,-4.740E-01, 9.500E+00,-1.660E+01, 3-3.100E-02,-2.300E-02,-4.530E-01, 3.580E-01,-5.430E+00, 1.550E+01/ C...Expansion coefficients for gluon distribution. DATA ((CDO(IP,IS,5,1),IS=1,6),IP=1,3)/ 1 1.560E+00, 0.000E+00, 6.000E+00, 9.000E+00, 0.000E+00, 0.000E+00, 2-1.710E+00,-9.490E-01, 1.440E+00,-7.190E+00,-1.650E+01, 1.530E+01, 3 6.380E-01, 3.250E-01,-1.050E+00, 2.550E-01, 1.090E+01,-1.010E+01/ DATA ((CDO(IP,IS,5,2),IS=1,6),IP=1,3)/ 1 8.790E-01, 0.000E+00, 4.000E+00, 9.000E+00, 0.000E+00, 0.000E+00, 2-9.710E-01,-1.160E+00, 1.230E+00,-5.640E+00,-7.540E+00,-5.960E-01, 3 4.340E-01, 4.760E-01,-2.540E-01,-8.170E-01, 5.500E+00, 1.260E-01/ C...The following data lines are coefficients needed in the C...Owens pion structure function parametrizations, see below. C...Expansion coefficients for up and down valence quark distributions. DATA ((COW(IP,IS,1,1),IS=1,5),IP=1,3)/ 1 4.0000E-01, 7.0000E-01, 0.0000E+00, 0.0000E+00, 0.0000E+00, 2 -6.2120E-02, 6.4780E-01, 0.0000E+00, 0.0000E+00, 0.0000E+00, 3 -7.1090E-03, 1.3350E-02, 0.0000E+00, 0.0000E+00, 0.0000E+00/ DATA ((COW(IP,IS,1,2),IS=1,5),IP=1,3)/ 1 4.0000E-01, 6.2800E-01, 0.0000E+00, 0.0000E+00, 0.0000E+00, 2 -5.9090E-02, 6.4360E-01, 0.0000E+00, 0.0000E+00, 0.0000E+00, 3 -6.5240E-03, 1.4510E-02, 0.0000E+00, 0.0000E+00, 0.0000E+00/ C...Expansion coefficients for gluon distribution. DATA ((COW(IP,IS,2,1),IS=1,5),IP=1,3)/ 1 8.8800E-01, 0.0000E+00, 3.1100E+00, 6.0000E+00, 0.0000E+00, 2 -1.8020E+00, -1.5760E+00, -1.3170E-01, 2.8010E+00, -1.7280E+01, 3 1.8120E+00, 1.2000E+00, 5.0680E-01, -1.2160E+01, 2.0490E+01/ DATA ((COW(IP,IS,2,2),IS=1,5),IP=1,3)/ 1 7.9400E-01, 0.0000E+00, 2.8900E+00, 6.0000E+00, 0.0000E+00, 2 -9.1440E-01, -1.2370E+00, 5.9660E-01, -3.6710E+00, -8.1910E+00, 3 5.9660E-01, 6.5820E-01, -2.5500E-01, -2.3040E+00, 7.7580E+00/ C...Expansion coefficients for (up+down+strange) quark sea distribution. DATA ((COW(IP,IS,3,1),IS=1,5),IP=1,3)/ 1 9.0000E-01, 0.0000E+00, 5.0000E+00, 0.0000E+00, 0.0000E+00, 2 -2.4280E-01, -2.1200E-01, 8.6730E-01, 1.2660E+00, 2.3820E+00, 3 1.3860E-01, 3.6710E-03, 4.7470E-02, -2.2150E+00, 3.4820E-01/ DATA ((COW(IP,IS,3,2),IS=1,5),IP=1,3)/ 1 9.0000E-01, 0.0000E+00, 5.0000E+00, 0.0000E+00, 0.0000E+00, 2 -1.4170E-01, -1.6970E-01, -2.4740E+00, -2.5340E+00, 5.6210E-01, 3 -1.7400E-01, -9.6230E-02, 1.5750E+00, 1.3780E+00, -2.7010E-01/ C...Expansion coefficients for charm quark sea distribution. DATA ((COW(IP,IS,4,1),IS=1,5),IP=1,3)/ 1 0.0000E+00, -2.2120E-02, 2.8940E+00, 0.0000E+00, 0.0000E+00, 2 7.9280E-02, -3.7850E-01, 9.4330E+00, 5.2480E+00, 8.3880E+00, 3 -6.1340E-02, -1.0880E-01, -1.0852E+01, -7.1870E+00, -1.1610E+01/ DATA ((COW(IP,IS,4,2),IS=1,5),IP=1,3)/ 1 0.0000E+00, -8.8200E-02, 1.9240E+00, 0.0000E+00, 0.0000E+00, 2 6.2290E-02, -2.8920E-01, 2.4240E-01, -4.4630E+00, -8.3670E-01, 3 -4.0990E-02, -1.0820E-01, 2.0360E+00, 5.2090E+00, -4.8400E-02/ C...The following data lines are coefficients needed in the C...Morfin and Tung structure function parametrization. C...12 coefficients each for d(valence), u(valence), g, u(sea), C...d(sea), s, c and b, in that order. DATA ((CMT1(IT,IP),IT=1,12),IP=1,8)/ 1 1.3178, -0.6651, -0.0616, 0.1256, 0.1923, -0.0233, 1 5.1084, 0.5081, 0.0156, -1.9303, 1.2551, -0.0698, 2 1.6518, -0.4491, -0.0752, 0.1518, 0.1807, -0.0239, 2 3.5553, 0.5630, 0.0113, -1.8374, 1.1228, -0.0655, 3 1.9178, -2.8296, 0.1598, -0.2075, -0.1188, 0.0463, 3 6.7570, -0.3242, -0.1925, -1.1231, 2.4722, -0.3005, 4 -0.9587, -1.3292, -0.0069, -0.1681, -0.2502, 0.0725, 4 8.8151, -0.3787, 0.1048, -1.2039, 1.2332, -0.0772, 5 -0.9594, -1.3289, -0.0069, -0.1678, -0.2502, 0.0725, 5 8.8139, -0.3779, 0.1049, -1.2026, 1.2332, -0.0775, 6 -1.6581, -1.2990, 0.0457, -0.2018, -0.1029, 0.0127, 6 8.5771, -0.9005, 0.3974, -1.0832, 1.9092, -0.3798, 7 -4.2179, 1.1314, -0.8045, -0.0609, -0.1557, 0.0249, 7 6.9475, 1.3365, -0.4293, 0.5671, 0.7210, 0.0041, 8 -6.3391, 2.6572, -1.1963, -0.1571, 0.0235, -0.0387, 8 6.5586, 1.0705, -0.2845, 0.5810, 1.3889, -0.2629/ C...Euler's beta function, requires ordinary Gamma function EULBET(X,Y)=PYGAMM(X)*PYGAMM(Y)/PYGAMM(X+Y) C...Reset structure functions, check x and hadron flavour. ALAM=0. DO 100 KFL=-6,6 100 XPQ(KFL)=0. IF(X.LE.0..OR.X.GE.1.) THEN WRITE(MSTU(11),1000) X RETURN ENDIF KFA=IABS(KF) IF(KFA.NE.211.AND.KFA.NE.2212.AND.KFA.NE.2112) THEN WRITE(MSTU(11),1100) KF RETURN ENDIF C...Call user-supplied structure function. Select proton/neutron/pion. IF(MSTP(51).EQ.0.OR.MSTP(52).GE.2) THEN KFE=KFA IF(KFA.EQ.2112) KFE=2212 CALL PYSTFE(KFE,X,Q2,XPQ) GOTO 230 ENDIF IF(KFA.EQ.211) GOTO 200 IF(MSTP(51).EQ.1.OR.MSTP(51).EQ.2) THEN C...Proton structure functions from Eichten, Hinchliffe, Lane, Quigg. C...Allowed variable range: 5 GeV^2 < Q^2 < 1E8 GeV^2; 1E-4 < x < 1 C...Determine set, Lamdba and x and t expansion variables. NSET=MSTP(51) IF(NSET.EQ.1) ALAM=0.2 IF(NSET.EQ.2) ALAM=0.29 TMIN=LOG(5./ALAM**2) TMAX=LOG(1E8/ALAM**2) IF(MSTP(52).EQ.0) THEN T=TMIN ELSE T=LOG(MAX(1.,Q2/ALAM**2)) ENDIF VT=MAX(-1.,MIN(1.,(2.*T-TMAX-TMIN)/(TMAX-TMIN))) NX=1 IF(X.LE.0.1) NX=2 IF(NX.EQ.1) VX=(2.*X-1.1)/0.9 IF(NX.EQ.2) VX=MAX(-1.,(2.*LOG(X)+11.51293)/6.90776) CXS=1. IF(X.LT.1E-4.AND.ABS(PARP(51)-1.).GT.0.01) CXS= & (1E-4/X)**(PARP(51)-1.) C...Chebyshev polynomials for x and t expansion. TX(1)=1. TX(2)=VX TX(3)=2.*VX**2-1. TX(4)=4.*VX**3-3.*VX TX(5)=8.*VX**4-8.*VX**2+1. TX(6)=16.*VX**5-20.*VX**3+5.*VX TT(1)=1. TT(2)=VT TT(3)=2.*VT**2-1. TT(4)=4.*VT**3-3.*VT TT(5)=8.*VT**4-8.*VT**2+1. TT(6)=16.*VT**5-20.*VT**3+5.*VT C...Calculate structure functions. DO 120 KFL=1,6 XQSUM=0. DO 110 IT=1,6 DO 110 IX=1,6 110 XQSUM=XQSUM+CEHLQ(IX,IT,NX,KFL,NSET)*TX(IX)*TT(IT) 120 XQ(KFL)=XQSUM*(1.-X)**NEHLQ(KFL,NSET)*CXS C...Put into output array. XPQ(0)=XQ(4) XPQ(1)=XQ(2)+XQ(3) XPQ(2)=XQ(1)+XQ(3) XPQ(3)=XQ(5) XPQ(4)=XQ(6) XPQ(-1)=XQ(3) XPQ(-2)=XQ(3) XPQ(-3)=XQ(5) XPQ(-4)=XQ(6) C...Special expansion for bottom (threshold effects). IF(MSTP(54).GE.5) THEN IF(NSET.EQ.1) TMIN=8.1905 IF(NSET.EQ.2) TMIN=7.4474 IF(T.LE.TMIN) GOTO 140 VT=MAX(-1.,MIN(1.,(2.*T-TMAX-TMIN)/(TMAX-TMIN))) TT(1)=1. TT(2)=VT TT(3)=2.*VT**2-1. TT(4)=4.*VT**3-3.*VT TT(5)=8.*VT**4-8.*VT**2+1. TT(6)=16.*VT**5-20.*VT**3+5.*VT XQSUM=0. DO 130 IT=1,6 DO 130 IX=1,6 130 XQSUM=XQSUM+CEHLQ(IX,IT,NX,7,NSET)*TX(IX)*TT(IT) XPQ(5)=XQSUM*(1.-X)**NEHLQ(7,NSET) XPQ(-5)=XPQ(5) 140 CONTINUE ENDIF C...Special expansion for top (threshold effects). IF(MSTP(54).GE.6) THEN IF(NSET.EQ.1) TMIN=11.5528 IF(NSET.EQ.2) TMIN=10.8097 TMIN=TMIN+2.*LOG(PMAS(6,1)/30.) TMAX=TMAX+2.*LOG(PMAS(6,1)/30.) IF(T.LE.TMIN) GOTO 160 VT=MAX(-1.,MIN(1.,(2.*T-TMAX-TMIN)/(TMAX-TMIN))) TT(1)=1. TT(2)=VT TT(3)=2.*VT**2-1. TT(4)=4.*VT**3-3.*VT TT(5)=8.*VT**4-8.*VT**2+1. TT(6)=16.*VT**5-20.*VT**3+5.*VT XQSUM=0. DO 150 IT=1,6 DO 150 IX=1,6 150 XQSUM=XQSUM+CEHLQ(IX,IT,NX,8,NSET)*TX(IX)*TT(IT) XPQ(6)=XQSUM*(1.-X)**NEHLQ(8,NSET) XPQ(-6)=XPQ(6) 160 CONTINUE ENDIF ELSEIF(MSTP(51).EQ.3.OR.MSTP(51).EQ.4) THEN C...Proton structure functions from Duke, Owens. C...Allowed variable range: 4 GeV^2 < Q^2 < approx 1E6 GeV^2. C...Determine set, Lambda and s expansion parameter. NSET=MSTP(51)-2 IF(NSET.EQ.1) ALAM=0.2 IF(NSET.EQ.2) ALAM=0.4 IF(MSTP(52).LE.0) THEN SD=0. ELSE SD=LOG(LOG(MAX(Q2,4.)/ALAM**2)/LOG(4./ALAM**2)) ENDIF C...Calculate structure functions. DO 180 KFL=1,5 DO 170 IS=1,6 170 TS(IS)=CDO(1,IS,KFL,NSET)+CDO(2,IS,KFL,NSET)*SD+ & CDO(3,IS,KFL,NSET)*SD**2 IF(KFL.LE.2) THEN XQ(KFL)=X**TS(1)*(1.-X)**TS(2)*(1.+TS(3)*X)/(EULBET(TS(1), & TS(2)+1.)*(1.+TS(3)*TS(1)/(TS(1)+TS(2)+1.))) ELSE XQ(KFL)=TS(1)*X**TS(2)*(1.-X)**TS(3)*(1.+TS(4)*X+TS(5)*X**2+ & TS(6)*X**3) ENDIF 180 CONTINUE C...Put into output arrays. XPQ(0)=XQ(5) XPQ(1)=XQ(2)+XQ(3)/6. XPQ(2)=3.*XQ(1)-XQ(2)+XQ(3)/6. XPQ(3)=XQ(3)/6. XPQ(4)=XQ(4) XPQ(-1)=XQ(3)/6. XPQ(-2)=XQ(3)/6. XPQ(-3)=XQ(3)/6. XPQ(-4)=XQ(4) ELSEIF(MSTP(51).EQ.5) THEN C...Proton structure functions from Morfin and Tung. C...Fit is to Q > 3.16 GeV. C...Calculate expansion parameters. IF(MSTP(52).EQ.0) THEN T=ALOG(ALOG(3.16/0.154)/ALOG(1.58/0.154)) ELSE T=ALOG(ALOG(MAX(3.16,SQRT(Q2))/0.154)/ALOG(1.58/0.154)) ENDIF T2=T**2 X1=1.-X XL=ALOG(1.+1./X) Calculate structure functions. DO 190 IP=1,8 190 XQ(IP)=EXP(CMT1(1,IP)+CMT1(2,IP)*T+CMT1(3,IP)*T2)* & X**(CMT1(4,IP)+CMT1(5,IP)*T+CMT1(6,IP)*T2)* & X1**(CMT1(7,IP)+CMT1(8,IP)*T+CMT1(9,IP)*T2)* & XL**(CMT1(10,IP)+CMT1(11,IP)*T+CMT1(12,IP)*T2) C...Put into output arrays. XPQ(0)=XQ(3) XPQ(1)=XQ(1)+XQ(5) XPQ(-1)=XQ(5) XPQ(2)=XQ(2)+XQ(4) XPQ(-2)=XQ(4) XPQ(3)=XQ(6) XPQ(-3)=XQ(6) XPQ(4)=XQ(7) XPQ(-4)=XQ(7) XPQ(5)=XQ(8) XPQ(-5)=XQ(8) C...Proton structure functions from Diemoz, Ferroni, Longo, Martinelli. C...These are accessed via PYSTFE since the files needed may not always C...available. ELSEIF(MSTP(51).GE.11.AND.MSTP(51).LE.13) THEN CALL PYSTFE(2212,X,Q2,XPQ) C...Unknown proton parametrization. ELSE WRITE(MSTU(11),1200) MSTP(51) ENDIF GOTO 230 200 IF((MSTP(51).GE.1.AND.MSTP(51).LE.5).OR. &(MSTP(51).GE.11.AND.MSTP(51).LE.13)) THEN C...Pion structure functions from Owens. C...Allowed variable range: 4 GeV^2 < Q^2 < approx 2000 GeV^2. C...Determine set, Lambda and s expansion variable. NSET=1 IF(MSTP(51).EQ.2.OR.MSTP(51).EQ.4.OR.MSTP(51).EQ.13) NSET=2 IF(NSET.EQ.1) ALAM=0.2 IF(NSET.EQ.2) ALAM=0.4 IF(MSTP(52).LE.0) THEN SD=0. ELSE SD=LOG(LOG(MAX(Q2,4.)/ALAM**2)/LOG(4./ALAM**2)) ENDIF C...Calculate structure functions. DO 220 KFL=1,4 DO 210 IS=1,5 210 TS(IS)=COW(1,IS,KFL,NSET)+COW(2,IS,KFL,NSET)*SD+ & COW(3,IS,KFL,NSET)*SD**2 IF(KFL.EQ.1) THEN XQ(KFL)=X**TS(1)*(1.-X)**TS(2)/EULBET(TS(1),TS(2)+1.) ELSE XQ(KFL)=TS(1)*X**TS(2)*(1.-X)**TS(3)*(1.+TS(4)*X+TS(5)*X**2) ENDIF 220 CONTINUE C...Put into output arrays. XPQ(0)=XQ(2) XPQ(1)=XQ(3)/6. XPQ(2)=XQ(1)+XQ(3)/6. XPQ(3)=XQ(3)/6. XPQ(4)=XQ(4) XPQ(-1)=XQ(1)+XQ(3)/6. XPQ(-2)=XQ(3)/6. XPQ(-3)=XQ(3)/6. XPQ(-4)=XQ(4) C...Unknown pion parametrization. ELSE WRITE(MSTU(11),1200) MSTP(51) ENDIF C...Isospin conjugation for neutron, charge conjugation for antipart. 230 IF(KFA.EQ.2112) THEN XPS=XPQ(1) XPQ(1)=XPQ(2) XPQ(2)=XPS XPS=XPQ(-1) XPQ(-1)=XPQ(-2) XPQ(-2)=XPS ENDIF IF(KF.LT.0) THEN DO 240 KFL=1,4 XPS=XPQ(KFL) XPQ(KFL)=XPQ(-KFL) 240 XPQ(-KFL)=XPS ENDIF C...Check positivity and reset above maximum allowed flavour. DO 250 KFL=-6,6 XPQ(KFL)=MAX(0.,XPQ(KFL)) 250 IF(IABS(KFL).GT.MSTP(54)) XPQ(KFL)=0. C...Formats for error printouts. 1000 FORMAT(' Error: x value outside physical range, x =',1P,E12.3) 1100 FORMAT(' Error: illegal particle code for structure function,', &' KF =',I5) 1200 FORMAT(' Error: bad value of parameter MSTP(51) in PYSTFU,', &' MSTP(51) =',I5) RETURN END C********************************************************************* SUBROUTINE PYSPLI(KF,KFLIN,KFLCH,KFLSP) C...In case of a hadron remnant which is more complicated than just a C...quark or a diquark, split it into two (partons or hadron + parton). DIMENSION KFL(3) C...Preliminaries. Parton composition. KFA=IABS(KF) KFS=ISIGN(1,KF) KFL(1)=MOD(KFA/1000,10) KFL(2)=MOD(KFA/100,10) KFL(3)=MOD(KFA/10,10) KFLR=KFLIN*KFS KFLCH=0 C...Subdivide meson. IF(KFL(1).EQ.0) THEN KFL(2)=KFL(2)*(-1)**KFL(2) KFL(3)=-KFL(3)*(-1)**IABS(KFL(2)) IF(KFLR.EQ.KFL(2)) THEN KFLSP=KFL(3) ELSEIF(KFLR.EQ.KFL(3)) THEN KFLSP=KFL(2) ELSEIF(IABS(KFLR).EQ.21.AND.RLU(0).GT.0.5) THEN KFLSP=KFL(2) KFLCH=KFL(3) ELSEIF(IABS(KFLR).EQ.21) THEN KFLSP=KFL(3) KFLCH=KFL(2) ELSEIF(KFLR*KFL(2).GT.0) THEN CALL LUKFDI(-KFLR,KFL(2),KFDUMP,KFLCH) KFLSP=KFL(3) ELSE CALL LUKFDI(-KFLR,KFL(3),KFDUMP,KFLCH) KFLSP=KFL(2) ENDIF C...Subdivide baryon. ELSE NAGR=0 DO 100 J=1,3 100 IF(KFLR.EQ.KFL(J)) NAGR=NAGR+1 IF(NAGR.GE.1) THEN RAGR=0.00001+(NAGR-0.00002)*RLU(0) IAGR=0 DO 110 J=1,3 IF(KFLR.EQ.KFL(J)) RAGR=RAGR-1. 110 IF(IAGR.EQ.0.AND.RAGR.LE.0.) IAGR=J ELSE IAGR=1.00001+2.99998*RLU(0) ENDIF ID1=1 IF(IAGR.EQ.1) ID1=2 IF(IAGR.EQ.1.AND.KFL(3).GT.KFL(2)) ID1=3 ID2=6-IAGR-ID1 KSP=3 IF(MOD(KFA,10).EQ.2.AND.KFL(1).EQ.KFL(2)) THEN IF(IAGR.NE.3.AND.RLU(0).GT.0.25) KSP=1 ELSEIF(MOD(KFA,10).EQ.2.AND.KFL(2).GE.KFL(3)) THEN IF(IAGR.NE.1.AND.RLU(0).GT.0.25) KSP=1 ELSEIF(MOD(KFA,10).EQ.2) THEN IF(IAGR.EQ.1) KSP=1 IF(IAGR.NE.1.AND.RLU(0).GT.0.75) KSP=1 ENDIF KFLSP=1000*KFL(ID1)+100*KFL(ID2)+KSP IF(KFLIN.EQ.21) THEN KFLCH=KFL(IAGR) ELSEIF(NAGR.EQ.0.AND.KFLR.GT.0) THEN CALL LUKFDI(-KFLR,KFL(IAGR),KFDUMP,KFLCH) ELSEIF(NAGR.EQ.0) THEN CALL LUKFDI(10000+KFLSP,-KFLR,KFDUMP,KFLCH) KFLSP=KFL(IAGR) ENDIF ENDIF C...Add on correct sign for result. KFLCH=KFLCH*KFS KFLSP=KFLSP*KFS RETURN END C********************************************************************* FUNCTION PYGAMM(X) C...Gives ordinary Gamma function Gamma(x) for positive, real arguments; C...see M. Abramowitz, I. A. Stegun: Handbook of Mathematical Functions C...(Dover, 1965) 6.1.36. DIMENSION B(8) DATA B/-0.577191652,0.988205891,-0.897056937,0.918206857, &-0.756704078,0.482199394,-0.193527818,0.035868343/ NX=INT(X) DX=X-NX PYGAMM=1. DO 100 I=1,8 100 PYGAMM=PYGAMM+B(I)*DX**I IF(X.LT.1.) THEN PYGAMM=PYGAMM/X ELSE DO 110 IX=1,NX-1 110 PYGAMM=(X-IX)*PYGAMM ENDIF RETURN END C*********************************************************************** FUNCTION PYW1AU(EPS,IREIM) C...Calculates real and imaginary parts of the auxiliary function W1; C...see R. K. Ellis, I. Hinchliffe, M. Soldate and J. J. van der Bij, C...FERMILAB-Pub-87/100-T, LBL-23504, June, 1987 COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) SAVE /LUDAT1/ ASINH(X)=LOG(X+SQRT(X**2+1.)) ACOSH(X)=LOG(X+SQRT(X**2-1.)) IF(EPS.LT.0.) THEN W1RE=2.*SQRT(1.-EPS)*ASINH(SQRT(-1./EPS)) W1IM=0. ELSEIF(EPS.LT.1.) THEN W1RE=2.*SQRT(1.-EPS)*ACOSH(SQRT(1./EPS)) W1IM=-PARU(1)*SQRT(1.-EPS) ELSE W1RE=2.*SQRT(EPS-1.)*ASIN(SQRT(1./EPS)) W1IM=0. ENDIF IF(IREIM.EQ.1) PYW1AU=W1RE IF(IREIM.EQ.2) PYW1AU=W1IM RETURN END C*********************************************************************** FUNCTION PYW2AU(EPS,IREIM) C...Calculates real and imaginary parts of the auxiliary function W2; C...see R. K. Ellis, I. Hinchliffe, M. Soldate and J. J. van der Bij, C...FERMILAB-Pub-87/100-T, LBL-23504, June, 1987 COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) SAVE /LUDAT1/ ASINH(X)=LOG(X+SQRT(X**2+1.)) ACOSH(X)=LOG(X+SQRT(X**2-1.)) IF(EPS.LT.0.) THEN W2RE=4.*(ASINH(SQRT(-1./EPS)))**2 W2IM=0. ELSEIF(EPS.LT.1.) THEN W2RE=4.*(ACOSH(SQRT(1./EPS)))**2-PARU(1)**2 W2IM=-4.*PARU(1)*ACOSH(SQRT(1./EPS)) ELSE W2RE=-4.*(ASIN(SQRT(1./EPS)))**2 W2IM=0. ENDIF IF(IREIM.EQ.1) PYW2AU=W2RE IF(IREIM.EQ.2) PYW2AU=W2IM RETURN END C*********************************************************************** FUNCTION PYI3AU(EPS,RAT,IREIM) C...Calculates real and imaginary parts of the auxiliary function I3; C...see R. K. Ellis, I. Hinchliffe, M. Soldate and J. J. van der Bij, C...FERMILAB-Pub-87/100-T, LBL-23504, June, 1987 COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) SAVE /LUDAT1/ BE=0.5*(1.+SQRT(1.+RAT*EPS)) IF(EPS.LT.1.) GA=0.5*(1.+SQRT(1.-EPS)) IF(EPS.LT.0.) THEN IF(ABS(EPS).LT.1.E-4.AND.ABS(RAT*EPS).LT.1.E-4) THEN F3RE=PYSPEN(-0.25*EPS/(1.+0.25*(RAT-1.)*EPS),0.,1)- & PYSPEN((1.-0.25*EPS)/(1.+0.25*(RAT-1.)*EPS),0.,1)+ & PYSPEN(0.25*(RAT+1.)*EPS/(1.+0.25*RAT*EPS),0.,1)- & PYSPEN((RAT+1.)/RAT,0.,1)+0.5*(LOG(1.+0.25*RAT*EPS)**2- & LOG(0.25*RAT*EPS)**2)+LOG(1.-0.25*EPS)* & LOG((1.+0.25*(RAT-1.)*EPS)/(1.+0.25*RAT*EPS))+ & LOG(-0.25*EPS)*LOG(0.25*RAT*EPS/(1.+0.25*(RAT-1.)*EPS)) ELSEIF(ABS(EPS).LT.1.E-4.AND.ABS(RAT*EPS).GE.1.E-4) THEN F3RE=PYSPEN(-0.25*EPS/(BE-0.25*EPS),0.,1)- & PYSPEN((1.-0.25*EPS)/(BE-0.25*EPS),0.,1)+ & PYSPEN((BE-1.+0.25*EPS)/BE,0.,1)- & PYSPEN((BE-1.+0.25*EPS)/(BE-1.),0.,1)+ & 0.5*(LOG(BE)**2-LOG(BE-1.)**2)+ & LOG(1.-0.25*EPS)*LOG((BE-0.25*EPS)/BE)+ & LOG(-0.25*EPS)*LOG((BE-1.)/(BE-0.25*EPS)) ELSEIF(ABS(EPS).GE.1.E-4.AND.ABS(RAT*EPS).LT.1.E-4) THEN F3RE=PYSPEN((GA-1.)/(GA+0.25*RAT*EPS),0.,1)- & PYSPEN(GA/(GA+0.25*RAT*EPS),0.,1)+ & PYSPEN((1.+0.25*RAT*EPS-GA)/(1.+0.25*RAT*EPS),0.,1)- & PYSPEN((1.+0.25*RAT*EPS-GA)/(0.25*RAT*EPS),0.,1)+ & 0.5*(LOG(1.+0.25*RAT*EPS)**2-LOG(0.25*RAT*EPS)**2)+ & LOG(GA)*LOG((GA+0.25*RAT*EPS)/(1.+0.25*RAT*EPS))+ & LOG(GA-1.)*LOG(0.25*RAT*EPS/(GA+0.25*RAT*EPS)) ELSE F3RE=PYSPEN((GA-1.)/(GA+BE-1.),0.,1)- & PYSPEN(GA/(GA+BE-1.),0.,1)+PYSPEN((BE-GA)/BE,0.,1)- & PYSPEN((BE-GA)/(BE-1.),0.,1)+0.5*(LOG(BE)**2-LOG(BE-1.)**2)+ & LOG(GA)*LOG((GA+BE-1.)/BE)+LOG(GA-1.)*LOG((BE-1.)/(GA+BE-1.)) ENDIF F3IM=0. ELSEIF(EPS.LT.1.) THEN IF(ABS(EPS).LT.1.E-4.AND.ABS(RAT*EPS).LT.1.E-4) THEN F3RE=PYSPEN(-0.25*EPS/(1.+0.25*(RAT-1.)*EPS),0.,1)- & PYSPEN((1.-0.25*EPS)/(1.+0.25*(RAT-1.)*EPS),0.,1)+ & PYSPEN((1.-0.25*EPS)/(-0.25*(RAT+1.)*EPS),0.,1)- & PYSPEN(1./(RAT+1.),0.,1)+LOG((1.-0.25*EPS)/(0.25*EPS))* & LOG((1.+0.25*(RAT-1.)*EPS)/(0.25*(RAT+1.)*EPS)) F3IM=-PARU(1)*LOG((1.+0.25*(RAT-1.)*EPS)/(0.25*(RAT+1.)*EPS)) ELSEIF(ABS(EPS).LT.1.E-4.AND.ABS(RAT*EPS).GE.1.E-4) THEN F3RE=PYSPEN(-0.25*EPS/(BE-0.25*EPS),0.,1)- & PYSPEN((1.-0.25*EPS)/(BE-0.25*EPS),0.,1)+ & PYSPEN((1.-0.25*EPS)/(1.-0.25*EPS-BE),0.,1)- & PYSPEN(-0.25*EPS/(1.-0.25*EPS-BE),0.,1)+ & LOG((1.-0.25*EPS)/(0.25*EPS))* & LOG((BE-0.25*EPS)/(BE-1.+0.25*EPS)) F3IM=-PARU(1)*LOG((BE-0.25*EPS)/(BE-1.+0.25*EPS)) ELSEIF(ABS(EPS).GE.1.E-4.AND.ABS(RAT*EPS).LT.1.E-4) THEN F3RE=PYSPEN((GA-1.)/(GA+0.25*RAT*EPS),0.,1)- & PYSPEN(GA/(GA+0.25*RAT*EPS),0.,1)+ & PYSPEN(GA/(GA-1.-0.25*RAT*EPS),0.,1)- & PYSPEN((GA-1.)/(GA-1.-0.25*RAT*EPS),0.,1)+ & LOG(GA/(1.-GA))*LOG((GA+0.25*RAT*EPS)/(1.+0.25*RAT*EPS-GA)) F3IM=-PARU(1)*LOG((GA+0.25*RAT*EPS)/(1.+0.25*RAT*EPS-GA)) ELSE F3RE=PYSPEN((GA-1.)/(GA+BE-1.),0.,1)- & PYSPEN(GA/(GA+BE-1.),0.,1)+PYSPEN(GA/(GA-BE),0.,1)- & PYSPEN((GA-1.)/(GA-BE),0.,1)+LOG(GA/(1.-GA))* & LOG((GA+BE-1.)/(BE-GA)) F3IM=-PARU(1)*LOG((GA+BE-1.)/(BE-GA)) ENDIF ELSE RSQ=EPS/(EPS-1.+(2.*BE-1.)**2) RCTHE=RSQ*(1.-2.*BE/EPS) RSTHE=SQRT(RSQ-RCTHE**2) RCPHI=RSQ*(1.+2.*(BE-1.)/EPS) RSPHI=SQRT(RSQ-RCPHI**2) R=SQRT(RSQ) THE=ACOS(RCTHE/R) PHI=ACOS(RCPHI/R) F3RE=PYSPEN(RCTHE,RSTHE,1)+PYSPEN(RCTHE,-RSTHE,1)- & PYSPEN(RCPHI,RSPHI,1)-PYSPEN(RCPHI,-RSPHI,1)+ & (PHI-THE)*(PHI+THE-PARU(1)) F3IM=PYSPEN(RCTHE,RSTHE,2)+PYSPEN(RCTHE,-RSTHE,2)- & PYSPEN(RCPHI,RSPHI,2)-PYSPEN(RCPHI,-RSPHI,2) ENDIF IF(IREIM.EQ.1) PYI3AU=2./(2.*BE-1.)*F3RE IF(IREIM.EQ.2) PYI3AU=2./(2.*BE-1.)*F3IM RETURN END C*********************************************************************** FUNCTION PYSPEN(XREIN,XIMIN,IREIM) C...Calculates real and imaginary part of Spence function; see C...G. 't Hooft and M. Veltman, Nucl. Phys. B153 (1979) 365. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) SAVE /LUDAT1/ DIMENSION B(0:14) DATA B/ & 1.000000E+00, -5.000000E-01, 1.666667E-01, & 0.000000E+00, -3.333333E-02, 0.000000E+00, & 2.380952E-02, 0.000000E+00, -3.333333E-02, & 0.000000E+00, 7.575757E-02, 0.000000E+00, &-2.531135E-01, 0.000000E+00, 1.166667E+00/ XRE=XREIN XIM=XIMIN IF(ABS(1.-XRE).LT.1.E-6.AND.ABS(XIM).LT.1.E-6) THEN IF(IREIM.EQ.1) PYSPEN=PARU(1)**2/6. IF(IREIM.EQ.2) PYSPEN=0. RETURN ENDIF XMOD=SQRT(XRE**2+XIM**2) IF(XMOD.LT.1.E-6) THEN IF(IREIM.EQ.1) PYSPEN=0. IF(IREIM.EQ.2) PYSPEN=0. RETURN ENDIF XARG=SIGN(ACOS(XRE/XMOD),XIM) SP0RE=0. SP0IM=0. SGN=1. IF(XMOD.GT.1.) THEN ALGXRE=LOG(XMOD) ALGXIM=XARG-SIGN(PARU(1),XARG) SP0RE=-PARU(1)**2/6.-(ALGXRE**2-ALGXIM**2)/2. SP0IM=-ALGXRE*ALGXIM SGN=-1. XMOD=1./XMOD XARG=-XARG XRE=XMOD*COS(XARG) XIM=XMOD*SIN(XARG) ENDIF IF(XRE.GT.0.5) THEN ALGXRE=LOG(XMOD) ALGXIM=XARG XRE=1.-XRE XIM=-XIM XMOD=SQRT(XRE**2+XIM**2) XARG=SIGN(ACOS(XRE/XMOD),XIM) ALGYRE=LOG(XMOD) ALGYIM=XARG SP0RE=SP0RE+SGN*(PARU(1)**2/6.-(ALGXRE*ALGYRE-ALGXIM*ALGYIM)) SP0IM=SP0IM-SGN*(ALGXRE*ALGYIM+ALGXIM*ALGYRE) SGN=-SGN ENDIF XRE=1.-XRE XIM=-XIM XMOD=SQRT(XRE**2+XIM**2) XARG=SIGN(ACOS(XRE/XMOD),XIM) ZRE=-LOG(XMOD) ZIM=-XARG SPRE=0. SPIM=0. SAVERE=1. SAVEIM=0. DO 100 I=0,14 TERMRE=(SAVERE*ZRE-SAVEIM*ZIM)/FLOAT(I+1) TERMIM=(SAVERE*ZIM+SAVEIM*ZRE)/FLOAT(I+1) SAVERE=TERMRE SAVEIM=TERMIM SPRE=SPRE+B(I)*TERMRE 100 SPIM=SPIM+B(I)*TERMIM IF(IREIM.EQ.1) PYSPEN=SP0RE+SGN*SPRE IF(IREIM.EQ.2) PYSPEN=SP0IM+SGN*SPIM RETURN END *********************************************************************** SUBROUTINE PYTEST(MTEST) C...Purpose: to provide a simple program (disguised as a subroutine) to C...run at installation as a check that the program works as intended. COMMON/LUJETS/N,K(4000,5),P(4000,5),V(4000,5) COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5) COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/ SAVE /PYSUBS/,/PYPARS/ C...Common initial values. Loop over initiating conditions. MSTP(122)=MAX(0,MIN(2,MTEST)) MDCY(LUCOMP(111),1)=0 NERR=0 DO 130 IPROC=1,7 C...Reset process type, kinematics cuts, and the flags used. MSEL=0 DO 100 ISUB=1,200 100 MSUB(ISUB)=0 CKIN(1)=2. CKIN(3)=0. MSTP(2)=1 MSTP(33)=0 MSTP(81)=1 MSTP(82)=1 MSTP(111)=1 MSTP(131)=0 MSTP(133)=0 PARP(131)=0.01 C...Prompt photon production at fixed target. IF(IPROC.EQ.1) THEN PZSUM=300. PESUM=SQRT(PZSUM**2+ULMASS(211)**2)+ULMASS(2212) PQSUM=2. MSEL=10 CKIN(3)=5. CALL PYINIT('FIXT','pi+','p',PZSUM) C...QCD processes at ISR energies. ELSEIF(IPROC.EQ.2) THEN PESUM=63. PZSUM=0. PQSUM=2. MSEL=1 CKIN(3)=5. CALL PYINIT('CMS','p','p',PESUM) C...W production + multiple interactions at CERN Collider. ELSEIF(IPROC.EQ.3) THEN PESUM=630. PZSUM=0. PQSUM=0. MSEL=12 CKIN(1)=20. MSTP(82)=4 MSTP(2)=2 MSTP(33)=3 CALL PYINIT('CMS','p','pbar',PESUM) C...W/Z gauge boson pairs + overlayed events at the Tevatron. ELSEIF(IPROC.EQ.4) THEN PESUM=1800. PZSUM=0. PQSUM=0. MSUB(22)=1 MSUB(23)=1 MSUB(25)=1 CKIN(1)=200. MSTP(111)=0 MSTP(131)=1 MSTP(133)=2 PARP(131)=0.04 CALL PYINIT('CMS','p','pbar',PESUM) C...Higgs production at LHC. ELSEIF(IPROC.EQ.5) THEN PESUM=17000. PZSUM=0. PQSUM=0. MSEL=16 PMAS(25,1)=300. CKIN(1)=200. MSTP(81)=0 MSTP(111)=0 CALL PYINIT('CMS','p','pbar',PESUM) C...Z' production at SSC. ELSEIF(IPROC.EQ.6) THEN PESUM=40000. PZSUM=0. PQSUM=0. MSEL=21 PMAS(32,1)=600. CKIN(1)=400. MSTP(81)=0 MSTP(111)=0 CALL PYINIT('CMS','p','pbar',PESUM) C...W pair production at 1 TeV e+e- collider. ELSEIF(IPROC.EQ.7) THEN PESUM=1000. PZSUM=0. PQSUM=0. MSUB(25)=1 CALL PYINIT('CMS','e+','e-',PESUM) ENDIF C...Generate 20 events of each required type. DO 120 IEV=1,20 CALL PYTHIA PESUMM=PESUM IF(IPROC.EQ.4) PESUMM=MSTI(41)*PESUM C...Check conservation of energy/momentum/flavour. MERR=0 DEVE=ABS(PLU(0,4)-PESUMM)+ABS(PLU(0,3)-PZSUM) DEVT=ABS(PLU(0,1))+ABS(PLU(0,2)) DEVQ=ABS(PLU(0,6)-PQSUM) IF(DEVE.GT.1E-3*PESUM.OR.DEVT.GT.MAX(0.01,1E-5*PESUM).OR. &DEVQ.GT.0.1) MERR=1 IF(MERR.NE.0) WRITE(MSTU(11),1000) IPROC,IEV C...Check that all KF codes are known ones, and that partons/particles C...satisfy energy-momentum-mass relation. DO 110 I=1,N IF(K(I,1).GT.20) GOTO 110 IF(LUCOMP(K(I,2)).EQ.0) THEN WRITE(MSTU(11),1100) I MERR=MERR+1 ENDIF PD=P(I,4)**2-P(I,1)**2-P(I,2)**2-P(I,3)**2-P(I,5)**2* &SIGN(1.,P(I,5)) IF(ABS(PD).GT.MAX(0.1,0.002*P(I,4)**2,0.002*P(I,5)**2).OR. &(P(I,5).GE.0..AND.P(I,4).LT.0.)) THEN WRITE(MSTU(11),1200) I MERR=MERR+1 ENDIF 110 CONTINUE C...Listing of erronoeus events, and first event of each type. IF(MERR.GE.1) NERR=NERR+1 IF(NERR.GE.10) THEN WRITE(MSTU(11),1300) CALL LULIST(1) STOP ENDIF IF(MTEST.GE.1.AND.(MERR.GE.1.OR.IEV.EQ.1)) THEN IF(MERR.GE.1) WRITE(MSTU(11),1400) CALL LULIST(1) ENDIF 120 CONTINUE C...List statistics for each process type. IF(MTEST.GE.1) CALL PYSTAT(1) 130 CONTINUE C...Summarize result of run. IF(NERR.EQ.0) WRITE(MSTU(11),1500) IF(NERR.GT.0) WRITE(MSTU(11),1600) NERR RETURN C...Formats for information. 1000 FORMAT(/5X,'Energy/momentum/flavour nonconservation for process', &I2,', event',I4) 1100 FORMAT(/5X,'Entry no.',I4,' in following event not known code') 1200 FORMAT(/5X,'Entry no.',I4,' in following event has faulty ', &'kinematics') 1300 FORMAT(/5X,'This is the tenth error experienced! Something is ', &'wrong.'/5X,'Execution will be stopped after listing of event.') 1400 FORMAT(5X,'Faulty event follows:') 1500 FORMAT(//5X,'End result of run: no errors detected.') 1600 FORMAT(//5X,'End result of run:',I2,' errors detected.'/ &5X,'This should not have happened!') END C********************************************************************* BLOCK DATA PYDATA C...Give sensible default values to all status codes and parameters. COMMON/PYSUBS/MSEL,MSUB(200),KFIN(2,-40:40),CKIN(200) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) COMMON/PYINT1/MINT(400),VINT(400) COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2) COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000) COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3) COMMON/PYINT5/NGEN(0:200,3),XSEC(0:200,3) COMMON/PYINT6/PROC(0:200) CHARACTER PROC*28 SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT4/, &/PYINT5/,/PYINT6/ C...Default values for allowed processes and kinematics constraints. DATA MSEL/1/ DATA MSUB/200*0/ DATA ((KFIN(I,J),J=-40,40),I=1,2)/40*1,0,80*1,0,40*1/ DATA CKIN/ & 2.0, -1.0, 0.0, -1.0, 1.0, 1.0, -10., 10., -10., 10., 1 -10., 10., -10., 10., -10., 10., -1.0, 1.0, -1.0, 1.0, 2 0.0, 1.0, 0.0, 1.0, -1.0, 1.0, -1.0, 1.0, 0., 0., 3 2.0, -1.0, 0., 0., 0., 0., 0., 0., 0., 0., 4 2.0, -1.0, 0., 0., 0., 0., 0., 0., 0., 0., 5 150*0./ C...Default values for main switches and parameters. Reset information. DATA (MSTP(I),I=1,100)/ & 3, 1, 2, 0, 0, 0, 0, 0, 0, 0, 1 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3 1, 2, 0, 0, 0, 2, 0, 0, 0, 0, 4 1, 0, 3, 7, 1, 0, 0, 0, 0, 0, 5 1, 1, 20, 6, 0, 0, 0, 0, 0, 0, 6 1, 2, 2, 2, 1, 0, 0, 0, 0, 0, 7 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8 1, 1, 100, 0, 0, 0, 0, 0, 0, 0, 9 1, 4, 0, 0, 0, 0, 0, 0, 0, 0/ DATA (MSTP(I),I=101,200)/ & 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 2 0, 1, 2, 1, 1, 20, 0, 0, 0, 0, 3 0, 4, 0, 1, 0, 0, 0, 0, 0, 0, 4 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8 5, 3, 1990, 04, 16, 0, 0, 0, 0, 0, 9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0/ DATA (PARP(I),I=1,100)/ & 0.25, 10., 0., 0., 0., 0., 0., 0., 0., 0., 1 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 2 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 3 1.5, 2.0, 0.075, 0., 0.2, 0., 0., 0., 0., 0., 4 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 5 1.0, 2.26, 1.E4, 1.E-4, 0., 0., 0., 0., 0., 0., 6 0.25, 1.0, 0.25, 1.0, 2.0, 1.E-3, 4.0, 0., 0., 0., 7 4.0, 0., 0., 0., 0., 0., 0., 0., 0., 0., 8 1.6, 2.00, 0.5, 0.2, 0.33, 0.66, 0.7, 0.5, 0., 0., 9 0.44, 0.44, 2.0, 1.0, 0., 3.0, 1.0, 0.75, 0., 0./ DATA (PARP(I),I=101,200)/ & -0.02, 0., 0., 0., 0., 0., 0., 0., 0., 0., 1 2.0, 0., 0., 0., 0., 0., 0., 0., 0., 0., 2 0.4, 0., 0., 0., 0., 0., 0., 0., 0., 0., 3 0.01, 0., 0., 0., 0., 0., 0., 0., 0., 0., 4 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 5 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 6 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 7 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 8 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 9 0., 0., 0., 0., 0., 0., 0., 0., 0., 0./ DATA MSTI/200*0/ DATA PARI/200*0./ DATA MINT/400*0/ DATA VINT/400*0./ C...Constants for the generation of the various processes. DATA (ISET(I),I=1,100)/ & 1, 1, 1, -1, 3, -1, -1, 3, -2, -2, 1 2, 2, 2, 2, 2, 2, -1, 2, 2, 2, 2 -1, 2, 2, 2, 2, 2, -1, 2, 2, 2, 3 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, 4 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 5 -1, -1, 2, -1, -1, -1, -1, -1, -1, -1, 6 -1, -1, -1, -1, -1, -1, -1, 2, -1, -1, 7 4, 4, 4, -1, -1, 4, 4, -1, -1, -2, 8 2, 2, -2, -2, -2, -2, -2, -2, -2, -2, 9 0, 0, 0, -1, 0, 5, -2, -2, -2, -2/ DATA (ISET(I),I=101,200)/ & -1, 1, -2, -2, -2, -2, -2, -2, -2, -2, 1 2, 2, 2, 2, -1, -1, -1, -2, -2, -2, 2 -1, -2, -2, -2, -2, -2, -2, -2, -2, -2, 3 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 4 1, 1, 1, -2, -2, -2, -2, -2, -2, -2, 5 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 6 2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 7 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 8 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 9 -2, -2, -2, -2, -2, -2, -2, -2, -2, -2/ DATA ((KFPR(I,J),J=1,2),I=1,50)/ & 23, 0, 24, 0, 25, 0, 24, 0, 25, 0, & 24, 0, 23, 0, 25, 0, 0, 0, 0, 0, 1 0, 0, 0, 0, 21, 21, 21, 22, 21, 23, 1 21, 24, 21, 25, 22, 22, 22, 23, 22, 24, 2 22, 25, 23, 23, 23, 24, 23, 25, 24, 24, 2 24, 25, 25, 25, 0, 21, 0, 22, 0, 23, 3 0, 24, 0, 25, 0, 21, 0, 22, 0, 23, 3 0, 24, 0, 25, 0, 21, 0, 22, 0, 23, 4 0, 24, 0, 25, 0, 21, 0, 22, 0, 23, 4 0, 24, 0, 25, 0, 21, 0, 22, 0, 23/ DATA ((KFPR(I,J),J=1,2),I=51,100)/ 5 0, 24, 0, 25, 0, 0, 0, 0, 0, 0, 5 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6 0, 0, 0, 0, 21, 21, 24, 24, 22, 24, 7 23, 23, 24, 24, 23, 24, 23, 25, 22, 22, 7 23, 23, 24, 24, 24, 25, 25, 25, 0, 0, 8 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0/ DATA ((KFPR(I,J),J=1,2),I=101,150)/ & 23, 0, 25, 0, 0, 0, 0, 0, 0, 0, & 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 21, 25, 0, 25, 21, 25, 22, 22, 22, 23, 1 23, 23, 24, 24, 0, 0, 0, 0, 0, 0, 2 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4 32, 0, 37, 0, 40, 0, 0, 0, 0, 0, 4 0, 0, 0, 0, 0, 0, 0, 0, 0, 0/ DATA ((KFPR(I,J),J=1,2),I=151,200)/ 5 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6 0, 37, 0, 0, 0, 0, 0, 0, 0, 0, 6 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0/ DATA COEF/4000*0./ DATA (((ICOL(I,J,K),K=1,2),J=1,4),I=1,40)/ 1 4,0,3,0,2,0,1,0,3,0,4,0,1,0,2,0,2,0,0,1,4,0,0,3,3,0,0,4,1,0,0,2, 2 3,0,0,4,1,4,3,2,4,0,0,3,4,2,1,3,2,0,4,1,4,0,2,3,4,0,3,4,2,0,1,2, 3 3,2,1,0,1,4,3,0,4,3,3,0,2,1,1,0,3,2,1,4,1,0,0,2,2,4,3,1,2,0,0,1, 4 3,2,1,4,1,4,3,2,4,2,1,3,4,2,1,3,3,4,4,3,1,2,2,1,2,0,3,1,2,0,0,0, 5 4,2,1,0,0,0,1,0,3,0,0,3,1,2,0,0,4,0,0,4,0,0,1,2,2,0,0,1,4,4,3,3, 6 2,2,1,1,4,4,3,3,3,3,4,4,1,1,2,2,3,2,1,3,1,2,0,0,4,2,1,4,0,0,1,2, 7 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 8 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 9 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, & 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0/ C...Character constants: name of processes. DATA PROC(0)/ 'All included subprocesses '/ DATA (PROC(I),I=1,20)/ 1'f + fb -> gamma*/Z0 ', 'f + fb'' -> W+/- ', 2'f + fb -> H0 ', 'gamma + W+/- -> W+/- ', 3'Z0 + Z0 -> H0 ', 'Z0 + W+/- -> W+/- ', 4' ', 'W+ + W- -> H0 ', 5' ', ' ', 6'f + f'' -> f + f'' ','f + fb -> f'' + fb'' ', 7'f + fb -> g + g ', 'f + fb -> g + gamma ', 8'f + fb -> g + Z0 ', 'f + fb'' -> g + W+/- ', 9'f + fb -> g + H0 ', 'f + fb -> gamma + gamma ', &'f + fb -> gamma + Z0 ', 'f + fb'' -> gamma + W+/- '/ DATA (PROC(I),I=21,40)/ 1'f + fb -> gamma + H0 ', 'f + fb -> Z0 + Z0 ', 2'f + fb'' -> Z0 + W+/- ', 'f + fb -> Z0 + H0 ', 3'f + fb -> W+ + W- ', 'f + fb'' -> W+/- + H0 ', 4'f + fb -> H0 + H0 ', 'f + g -> f + g ', 5'f + g -> f + gamma ', 'f + g -> f + Z0 ', 6'f + g -> f'' + W+/- ', 'f + g -> f + H0 ', 7'f + gamma -> f + g ', 'f + gamma -> f + gamma ', 8'f + gamma -> f + Z0 ', 'f + gamma -> f'' + W+/- ', 9'f + gamma -> f + H0 ', 'f + Z0 -> f + g ', &'f + Z0 -> f + gamma ', 'f + Z0 -> f + Z0 '/ DATA (PROC(I),I=41,60)/ 1'f + Z0 -> f'' + W+/- ', 'f + Z0 -> f + H0 ', 2'f + W+/- -> f'' + g ', 'f + W+/- -> f'' + gamma ', 3'f + W+/- -> f'' + Z0 ', 'f + W+/- -> f'' + W+/- ', 4'f + W+/- -> f'' + H0 ', 'f + H0 -> f + g ', 5'f + H0 -> f + gamma ', 'f + H0 -> f + Z0 ', 6'f + H0 -> f'' + W+/- ', 'f + H0 -> f + H0 ', 7'g + g -> f + fb ', 'g + gamma -> f + fb ', 8'g + Z0 -> f + fb ', 'g + W+/- -> f + fb'' ', 9'g + H0 -> f + fb ', 'gamma + gamma -> f + fb ', &'gamma + Z0 -> f + fb ', 'gamma + W+/- -> f + fb'' '/ DATA (PROC(I),I=61,80)/ 1'gamma + H0 -> f + fb ', 'Z0 + Z0 -> f + fb ', 2'Z0 + W+/- -> f + fb'' ', 'Z0 + H0 -> f + fb ', 3'W+ + W- -> f + fb ', 'W+/- + H0 -> f + fb'' ', 4'H0 + H0 -> f + fb ', 'g + g -> g + g ', 5'gamma + gamma -> W+ + W- ', 'gamma + W+/- -> gamma + W+/-', 6'Z0 + Z0 -> Z0 + Z0 ', 'Z0 + Z0 -> W+ + W- ', 7'Z0 + W+/- -> Z0 + W+/- ', 'Z0 + Z0 -> Z0 + H0 ', 8'W+ + W- -> gamma + gamma ', 'W+ + W- -> Z0 + Z0 ', 9'W+/- + W+/- -> W+/- + W+/- ', 'W+/- + H0 -> W+/- + H0 ', &'H0 + H0 -> H0 + H0 ', ' '/ DATA (PROC(I),I=81,100)/ 1'q + qb -> Q + QB, massive ', 'g + g -> Q + QB, massive ', 2' ', ' ', 3' ', ' ', 4' ', ' ', 5' ', ' ', 6'Elastic scattering ', 'Single diffractive ', 7'Double diffractive ', 'Central diffractive ', 8'Low-pT scattering ', 'Semihard QCD 2 -> 2 ', 9' ', ' ', &' ', ' '/ DATA (PROC(I),I=101,120)/ 1'g + g -> gamma*/Z0 ', 'g + g -> H0 ', 2' ', ' ', 3' ', ' ', 4' ', ' ', 5' ', ' ', 6'f + fb -> g + H0 ', 'q + g -> q + H0 ', 7'g + g -> g + H0 ', 'g + g -> gamma + gamma ', 8'g + g -> gamma + Z0 ', 'g + g -> Z0 + Z0 ', 9'g + g -> W+ + W- ', ' ', &' ', ' '/ DATA (PROC(I),I=121,140)/ 1'g + g -> f + fb + H0 ', ' ', 2' ', ' ', 3' ', ' ', 4' ', ' ', 5' ', ' ', 6' ', ' ', 7' ', ' ', 8' ', ' ', 9' ', ' ', &' ', ' '/ DATA (PROC(I),I=141,160)/ 1'f + fb -> gamma*/Z0/Z''0 ', 'f + fb'' -> H+/- ', 2'f + fb -> R ', ' ', 3' ', ' ', 4' ', ' ', 5' ', ' ', 6' ', ' ', 7' ', ' ', 8' ', ' ', 9' ', ' ', &' ', ' '/ DATA (PROC(I),I=161,180)/ 1'f + g -> f'' + H+/- ', ' ', 2' ', ' ', 3' ', ' ', 4' ', ' ', 5' ', ' ', 6' ', ' ', 7' ', ' ', 8' ', ' ', 9' ', ' ', &' ', ' '/ DATA (PROC(I),I=181,200)/ 20*' '/ END C********************************************************************* SUBROUTINE PYKCUT(MCUT) C...Dummy routine, which the user can replace in order to make cuts on C...the kinematics on the parton level before the matrix elements are C...evaluated and the event is generated. The cross-section estimates C...will automatically take these cuts into account, so the given C...values are for the allowed phase space region only. MCUT=0 means C...that the event has passed the cuts, MCUT=1 that it has failed. COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) SAVE /PYPARS/ MCUT=0 RETURN END C********************************************************************* SUBROUTINE PYSTFE(KF,X,Q2,XPQ) C...This is a dummy routine, where the user can introduce an interface C...to his own external structure function parametrization. C...Arguments in: C...KF : 2212 for p, 211 for pi+; isospin conjugation for n and charge C... conjugation for pbar, nbar or pi- is performed by PYSTFU. C...X : x value. C...Q2 : Q^2 value. C...Arguments out: C...XPQ(-6:6) : x * f(x,Q^2), with index according to KF code, C... except that gluon is placed in 0. Thus XPQ(0) = xg, C... XPQ(1) = xd, XPQ(-1) = xdbar, XPQ(2) = xu, XPQ(-2) = xubar, C... XPQ(3) = xs, XPQ(-3) = xsbar, XPQ(4) = xc, XPQ(-4) = xcbar, C... XPQ(5) = xb, XPQ(-5) = xbbar, XPQ(6) = xt, XPQ(-6) = xtbar. C... C...One such interface, to the Diemos, Ferroni, Longo, Martinelli C...proton structure functions, already comes with the package. What C...the user needs here is external files with the three routines C...FXG160, FXG260 and FXG360 of the authors above, plus the C...interpolation routine FINT, which is part of the CERN library C...KERNLIB package. To avoid problems with unresolved external C...references, the external calls are commented in the current C...version. To enable this option, remove the C* at the beginning C...of the relevant lines. C... C...Alternatively, the routine can be used as an interface to the C...structure function evolution program of Tung. This can be achieved C...by removing C* at the beginning of some of the lines below. COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200) COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4) COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200) SAVE /LUDAT1/,/LUDAT2/ SAVE /PYPARS/ DIMENSION XPQ(-6:6),XFDFLM(9) CHARACTER CHDFLM(9)*5,HEADER*40 DATA CHDFLM/'UPVAL','DOVAL','GLUON','QBAR ','UBAR ','SBAR ', &'CBAR ','BBAR ','TBAR '/ DATA HEADER/'Tung evolution package has been invoked'/ DATA INIT/0/ C...Proton structure functions from Diemoz, Ferroni, Longo, Martinelli. C...Allowed variable range 10 GeV2 < Q2 < 1E8 GeV2, 5E-5 < x < .95. IF(MSTP(51).GE.11.AND.MSTP(51).LE.13.AND.MSTP(52).LE.1) THEN XDFLM=MAX(0.51E-4,X) Q2DFLM=MAX(10.,MIN(1E8,Q2)) IF(MSTP(52).EQ.0) Q2DFLM=10. DO 100 J=1,9 IF(MSTP(52).EQ.1.AND.J.EQ.9) THEN Q2DFLM=Q2DFLM*(40./PMAS(6,1))**2 Q2DFLM=MAX(10.,MIN(1E8,Q2)) ENDIF XFDFLM(J)=0. C...Remove C* on following three lines to enable the DFLM options. C* IF(MSTP(51).EQ.11) CALL FXG160(XDFLM,Q2DFLM,CHDFLM(J),XFDFLM(J)) C* IF(MSTP(51).EQ.12) CALL FXG260(XDFLM,Q2DFLM,CHDFLM(J),XFDFLM(J)) C* IF(MSTP(51).EQ.13) CALL FXG360(XDFLM,Q2DFLM,CHDFLM(J),XFDFLM(J)) 100 CONTINUE IF(X.LT.0.51E-4.AND.ABS(PARP(51)-1.).GT.0.01) THEN CXS=(0.51E-4/X)**(PARP(51)-1.) DO 110 J=1,7 110 XFDFLM(J)=XFDFLM(J)*CXS ENDIF XPQ(0)=XFDFLM(3) XPQ(1)=XFDFLM(2)+XFDFLM(5) XPQ(2)=XFDFLM(1)+XFDFLM(5) XPQ(3)=XFDFLM(6) XPQ(4)=XFDFLM(7) XPQ(5)=XFDFLM(8) XPQ(6)=XFDFLM(9) XPQ(-1)=XFDFLM(5) XPQ(-2)=XFDFLM(5) XPQ(-3)=XFDFLM(6) XPQ(-4)=XFDFLM(7) XPQ(-5)=XFDFLM(8) XPQ(-6)=XFDFLM(9) C...Proton structure function evolution from Wu-Ki Tung: parton C...distribution functions incorporating heavy quark mass effects. C...Allowed variable range: PARP(52) < Q < PARP(53); PARP(54) < x < 1. ELSE IF(INIT.EQ.0) THEN I1=0 IF(MSTP(52).EQ.4) I1=1 IHDRN=1 NU=MSTP(53) I2=MSTP(51) IF(MSTP(51).GE.11) I2=MSTP(51)-3 I3=0 IF(MSTP(52).EQ.3) I3=1 C...Convert to Lambda in CWZ scheme (approximately linear relation). ALAM=0.75*PARP(1) TPMS=PMAS(6,1) QINI=PARP(52) QMAX=PARP(53) XMIN=PARP(54) C...Initialize evolution (perform calculation or read results from C...file). C...Remove C* on following two lines to enable Tung initialization. C* CALL PDFSET(I1,IHDRN,ALAM,TPMS,QINI,QMAX,XMIN,NU,HEADER, C* & I2,I3,IRET,IRR) INIT=1 ENDIF C...Put into output array. Q=SQRT(Q2) DO 200 I=-6,6 FIXQ=0. C...Remove C* on following line to enable structure function call. C* FIXQ=MAX(0.,PDF(10,1,I,X,Q,IR)) 200 XPQ(I)=X*FIXQ C...Change order of u and d quarks from Tung to PYTHIA convention. XPS=XPQ(1) XPQ(1)=XPQ(2) XPQ(2)=XPS XPS=XPQ(-1) XPQ(-1)=XPQ(-2) XPQ(-2)=XPS ENDIF RETURN END