#include <SigmaTotal.h>

Inheritance diagram for SigmaTotAux:

Public Member Functions
	SigmaTotAux ()
	Constructor.

virtual	~SigmaTotAux ()
	Destructor.

virtual void	init (Info *)=0
	Store pointers and initialize data members.

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

virtual bool	calcTotEl (int, int, double, double, double)

virtual double	dsigmaEl (double, bool=false, bool=false)
	Differential elastic cross section, d(sigma_el) / dt.

virtual bool	calcDiff (int, int, double, double, double)

virtual double	dsigmaSD (double, double, bool=true, int=0)

virtual bool	splitDiff ()
	Possibility to separate xi and t choices for diffraction.

virtual double	dsigmaDD (double, double, double, int=0)

virtual double	dsigmaCD (double, double, double, double, int)

virtual double	mMinCD ()
	Minimal central diffractive mass.

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.

Public Attributes
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
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
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
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 SigmaTotAux is base class for the different parametrizations made accessible via SigmaTotal. Many variables are public, since they can only be accessed via the SigmaTotal methods anyway.

Member Function Documentation

bool addCoulomb ( )

protectedvirtual

Add Coulomb corrections to the elastic and total cross sections.

Trivial case when there should be no Coulomb contribution.

Relative sign (or zero) for Coulomb term in elastic scattering.

Done if no Coulomb corrections.

Reduce hadronic part of elastic cross section by tMin cut.

Loop through t range according to dt/t^2.

Evaluate Coulomb and interference terms.

Include common factors to give new elastic and total cross sections.

Done.

virtual bool calcDiff	(	int	,
		int	,
		double	,
		double	,
		double
	)

inlinevirtual

Calculate integrated diffractive cross sections. Usage: calcDiff( idAin, idBin, sIn, mAin, mBin).

Reimplemented in SigmaABMST, SigmaMBR, SigmaSaSDL, and SigmaTotOwn.

virtual bool calcTotEl	(	int	,
		int	,
		double	,
		double	,
		double
	)

inlinevirtual

Calculate integrated total/elastic cross sections. Usage: calcTotEl( idAin, idBin, sIn, mAin, mBin).

Reimplemented in SigmaRPP, SigmaABMST, SigmaMBR, SigmaSaSDL, and SigmaTotOwn.

virtual double dsigmaCD	(	double	,
		double	,
		double	,
		double	,
		int
	)

inlinevirtual

Differential central diffractive cross section, xi1 * xi2 * d(sigma_CD) / (dxi1 dxi2 dt1 dt2).

Reimplemented in SigmaABMST, SigmaMBR, SigmaSaSDL, and SigmaTotOwn.

virtual double dsigmaDD	(	double	,
		double	,
		double	,
		int	= `0`
	)

inlinevirtual

Differential double diffractive cross section, xi1 * xi2 * d(sigma_DD) / (dxi1 dxi2 dt).

Reimplemented in SigmaABMST, SigmaMBR, SigmaSaSDL, and SigmaTotOwn.

double dsigmaElCoulomb ( double t )

protectedvirtual

Coulomb contribution to the differential elastic cross sections.

Coulomb contribution and interference.

virtual double dsigmaSD	(	double	,
		double	,
		bool	= `true`,
		int	= `0`
	)

inlinevirtual

Differential single diffractive cross section, xi * d(sigma_SD) / (dxi dt).

Reimplemented in SigmaABMST, SigmaMBR, SigmaSaSDL, and SigmaTotOwn.

bool initCoulomb	(	Settings &	settings,
		ParticleData *	particleDataPtrIn
	)

protectedvirtual

Initialize Coulomb correction parameters.

Save pointer to particle database.

User-set values for total and elastic cross section.

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

inline

Standard methods to find t range of a 2 -> 2 process and to check whether a given t value is in that range.

Member Data Documentation

const double ALPHAEM = 0.00729353

staticprotected

alpha_em(0).

The SigmaTotAux class. Base class for the individual implementations.

const int NPOINTS = 1000

staticprotected

Constants: could only be changed in the code itself.

Numerical integration parameters.

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

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

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Static Protected Attributes

Detailed Description

Member Function Documentation

Member Data Documentation