#include <SigmaTotal.h>

Inheritance diagram for SigmaMBR:

Public Member Functions
	SigmaMBR ()
	Constructor.

virtual void	init (Info *infoPtrIn)
	Initialize data members. More...

virtual bool	calcTotEl (int idAin, int idBin, double sIn, double, double)
	Calculate integrated total/elastic cross sections. More...

virtual double	dsigmaEl (double t, bool useCoulomb=false, bool=false)
	Differential elastic cross section. More...

virtual bool	calcDiff (int, int, double sIn, double, double)
	Calculate integrated diffractive cross sections. More...

virtual bool	splitDiff ()
	In MBR choice of xi and t values are separated.

virtual double	dsigmaSD (double xi, double t, bool=true, int step=0)
	Differential single diffractive cross section. More...

virtual double	dsigmaDD (double xi1, double xi2, double t, int step=0)
	Differential double diffractive cross section. More...

virtual double	dsigmaCD (double xi1, double xi2, double t1, double t2, int step=0)
	Differential central diffractive cross section. More...

virtual double	mMinCD ()
	Minimal central diffractive mass.

Public Member Functions inherited from SigmaTotAux
	SigmaTotAux ()
	Constructor.

virtual	~SigmaTotAux ()
	Destructor.

virtual bool	calcTot (int, int, double)
	Calculate total cros section only. Only implemented for SigmaSaSDL.

pair< double, double >	tRange (double sIn, double s1In, double s2In, double s3In, double s4In)

bool	tInRange (double tIn, double sIn, double s1In, double s2In, double s3In, double s4In)

double	pFormFac (double tIn)
	Commonly used proton form factor.

Additional Inherited Members
Public Attributes inherited from SigmaTotAux
bool	isExpEl
	Store total and elastic cross section properties.

bool	hasCou

double	sigTot

double	rhoOwn

double	sigEl

double	bEl

double	sigTotCou

double	sigElCou

double	sigXB
	Store diffractive cross sections. Possibly also sigmaND.

double	sigAX

double	sigXX

double	sigAXB

double	sigNDtmp

Protected Member Functions inherited from SigmaTotAux
virtual bool	initCoulomb (Settings &settings, ParticleData *particleDataPtrIn)
	Initialize Coulomb correction parameters. More...

virtual bool	addCoulomb ()
	Add Coulomb corrections to the elastic and total cross sections. More...

virtual double	dsigmaElCoulomb (double t)
	Coulomb contribution to the differential elastic cross sections. More...

Protected Attributes inherited from SigmaTotAux
int	idA
	Initialization data, normally only set once.

int	idB

bool	tryCoulomb
	Add Coulomb corrections to the elastic cross section.

double	chgSgn

double	tAbsMin

double	lambda

double	phaseCst

ParticleData *	particleDataPtr
	Pointer to the particle data table.

Rndm *	rndmPtr
	Pointer to the random number generator.

Static Protected Attributes inherited from SigmaTotAux
static const int	NPOINTS = 1000
	Constants: could only be changed in the code itself. More...

static const double	ALPHAEM = 0.00729353
	alpha_em(0). More...

static const double	CONVERTEL = 0.0510925
	Conversion coefficients = 1/(16pi) * (mb <-> GeV^2).

static const double	MPROTON = 0.9382720
	Proton and pion masses, and their squares. Euler's constant.

static const double	SPROTON = 0.8803544

static const double	MPION = 0.1349766

static const double	SPION = 0.0182187

static const double	GAMMAEUL = 0.577215665

static const double	TABSREF = 2e-3
	Reference scale for nominal definition of t slope.

static const double	TABSMAX = 1.

static const double	MINSLOPEEL = 10.

Detailed Description

The SigmaMBR class parametrizes total and elastic cross sections according to the Minimum Bias Rockefeller (MBR) model.

Member Function Documentation

bool calcDiff	(	int	,
		int	,
		double	sIn,
		double	,
		double
	)

virtual

Calculate integrated diffractive cross sections.

Total diffractive cross sections, obtained from the ratio of two integrals: the Regge cross section and the renormalized flux.

Common variables,

Calculate SD cross section.

SD flux.

Regge SD cross section.

Calculate DD cross section. Note: dymaxDD = ln(s * s0 /mMin^4) with s0 = 1 GeV^2.

DD flux.

Regge DD cross section.

Calculate DPE (CD) cross section.

DPE flux.

Regge DPE (CD) cross section.

Output to standard names. Done.

Reimplemented from SigmaTotAux.

bool calcTotEl	(	int	idAin,
		int	idBin,
		double	sIn,
		double	,
		double
	)

virtual

Calculate integrated total/elastic cross sections.

Total and elastic cross section.

Save some input.

Total cross section and elastic/total parametrizations.

Possibly add Coulomb correction and interference.

Done.

Reimplemented from SigmaTotAux.

double dsigmaCD	(	double	xi1,
		double	xi2,
		double	t1,
		double	t2,
		int	step = `0`
	)

virtual

Differential central diffractive cross section.

Differential central diffractive cross section, separated in xi and t steps.

Rapidity gap sizes.

Step 1: evaluate cross section in xi1 and xi2, integrated over t1 and t2.

Step 2: evaluate cross section in t1 and t2 for fixed xi1 and xi2.

Done.

Reimplemented from SigmaTotAux.

double dsigmaDD	(	double	xi1,
		double	xi2,
		double	t,
		int	step = `0`
	)

virtual

Differential double diffractive cross section.

Differential double diffractive cross sections, separated in xi and t steps.

Rapidity gap size (with implicit scale s_0 = 1 GeV).

Step 1: evaluate cross section in xi1 and xi2, integrated over t.

Step 2: evaluate cross section in t for fixed xi1 and xi2.

Done.

Reimplemented from SigmaTotAux.

double dsigmaEl	(	double	t,
		bool	useCoulomb = `false`,
		bool	= `false`
	)

virtual

Differential elastic cross section.

Hadronic contribution: simple exponential.

Possibly add Coulomb contribution and interference.

Done.

Reimplemented from SigmaTotAux.

double dsigmaSD	(	double	xi,
		double	t,
		bool	= `true`,
		int	step = `0`
	)

virtual

Differential single diffractive cross section.

Differential single diffractive cross sections, separated in xi and t steps.

Rapidity gap size.

Step 1: evaluate cross section in xi, integrated over t.

Step 2: evaluate cross section in t for fixed xi.

Done.

Reimplemented from SigmaTotAux.

void init ( Info * infoPtrIn )

virtual

Initialize data members.

Use shorthand for settings

Parameters for MBR model.

Initialize parameters for Coulomb corrections to elastic scattering.

No rho parameter implemented.

Implements SigmaTotAux.

The documentation for this class was generated from the following files:

include/Pythia8/SigmaTotal.h
src/SigmaTotal.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation