The StringPT class is used to select select transverse momenta. More...

#include <FragmentationFlavZpT.h>

Inheritance diagram for StringPT:

Public Member Functions
	StringPT ()
	Constructor.

virtual	~StringPT ()
	Destructor.

virtual void	init ()
	Initialize data members. More...

pair< double, double >	pxy (int idIn, double kappaRatio=0.0)

pair< double, double >	pxyGauss (int idIn=0, double kappaRatio=0.0)

pair< double, double >	pxyThermal (int idIn, double kappaRatio=0.0)

double	suppressPT2 (double pT2)
	Gaussian suppression of given pT2; used in MiniStringFragmentation.

Public Member Functions inherited from PhysicsBase
void	initInfoPtr (Info &infoPtrIn)
	This function is called from above for physics objects used in a run. More...

virtual	~PhysicsBase ()
	Empty virtual destructor.

bool	flag (string key) const
	Shorthand to read settings values.

int	mode (string key) const

double	parm (string key) const

string	word (string key) const

vector< bool >	fvec (string key) const

vector< int >	mvec (string key) const

vector< double >	pvec (string key) const

vector< string >	wvec (string key) const

Protected Attributes
bool	useWidthPre

double	sigmaQ

double	enhancedFraction

double	enhancedWidth

double	sigma2Had

double	widthPreStrange

double	widthPreDiquark

double	closePackingFacPT2

bool	thermalModel
	Thermal model.

double	temperature

double	tempPreFactor

double	fracSmallX

bool	closePacking
	Both.

double	exponentMPI

double	exponentNSP

Protected Attributes inherited from PhysicsBase
Info *	infoPtr = {}

Settings *	settingsPtr = {}
	Pointer to the settings database.

ParticleData *	particleDataPtr = {}
	Pointer to the particle data table.

Logger *	loggerPtr = {}
	Pointer to logger.

HadronWidths *	hadronWidthsPtr = {}
	Pointer to the hadron widths data table.

Rndm *	rndmPtr = {}
	Pointer to the random number generator.

CoupSM *	coupSMPtr = {}
	Pointers to SM and SUSY couplings.

CoupSUSY *	coupSUSYPtr = {}

BeamSetup *	beamSetupPtr = {}

BeamParticle *	beamAPtr = {}

BeamParticle *	beamBPtr = {}

BeamParticle *	beamPomAPtr = {}

BeamParticle *	beamPomBPtr = {}

BeamParticle *	beamGamAPtr = {}

BeamParticle *	beamGamBPtr = {}

BeamParticle *	beamVMDAPtr = {}

BeamParticle *	beamVMDBPtr = {}

PartonSystems *	partonSystemsPtr = {}
	Pointer to information on subcollision parton locations.

SigmaTotal *	sigmaTotPtr = {}
	Pointers to the total/elastic/diffractive cross sections.

SigmaCombined *	sigmaCmbPtr = {}

set< PhysicsBase * >	subObjects

UserHooksPtr	userHooksPtr

Static Protected Attributes
static const double	SIGMAMIN = 0.2
	Constants: could only be changed in the code itself. More...

Additional Inherited Members
Public Types inherited from PhysicsBase
enum	Status { INCOMPLETE = -1, COMPLETE = 0, CONSTRUCTOR_FAILED, INIT_FAILED, LHEF_END, LOWENERGY_FAILED, PROCESSLEVEL_FAILED, PROCESSLEVEL_USERVETO, MERGING_FAILED, PARTONLEVEL_FAILED, PARTONLEVEL_USERVETO, HADRONLEVEL_FAILED, CHECK_FAILED, OTHER_UNPHYSICAL, HEAVYION_FAILED, HADRONLEVEL_USERVETO }
	Enumerate the different status codes the event generation can have.

Protected Member Functions inherited from PhysicsBase
	PhysicsBase ()
	Default constructor.

virtual void	onInitInfoPtr ()

virtual void	onBeginEvent ()
	This function is called in the very beginning of each Pythia::next call.

virtual void	onEndEvent (Status)

virtual void	onStat ()
	This function is called from the Pythia::stat() call.

void	registerSubObject (PhysicsBase &pb)
	Register a sub object that should have its information in sync with this.

Detailed Description

The StringPT class is used to select select transverse momenta.

Member Function Documentation

void init ( )

virtual

Initialize data members.

Initialize data members of the string pT selection.

Parameters of the pT width and enhancement.

Temperature for thermal model.

Upper estimate of thermal spectrum: fraction at x = pT_quark/T < 1.

Enhanced-width prefactor for MPIs and/or nearby string pieces.

Parameter for pT suppression in MiniStringFragmentation.

Reimplemented in HVStringPT.

pair<double, double> pxy	(	int	idIn,
		double	kappaRatio = `0.0`
	)

inline

General function, return px and py as a pair in the same call in either model.

pair< double, double > pxyGauss	(	int	idIn = `0`,
		double	kappaRatio = `0.0`
	)

Generate Gaussian pT such that <p_x^2> = <p_x^2> = sigma^2 = width^2/2, but with small fraction multiplied up to a broader spectrum.

Normal (classical) width selection and factor for sigma variations.

Prefactor for strange quarks and diquarks.

Enhanced-width prefactor for MPIs and/or nearby string pieces.

Generate (p_x, p_y) pair.

Calculate the weights from the variations.

Return the result.

pair< double, double > pxyThermal	(	int	idIn,
		double	kappaRatio = `0.0`
	)

Generate quark pT according to fitting functions, such that hadron pT is generated according to exp(-pT/T) d^2pT.

Temperature increase to work against asymmetry. Apply for s/c/b and diquarks.

Enhanced-width prefactor for MPIs and/or nearby string pieces.

Pick x = pT_quark/T according to K_{1/4}(x)/x^{1/4} * x dx.

Find pT_quark. Random number to decide on angle.

Done.

Member Data Documentation

const double SIGMAMIN = 0.2

staticprotected

Constants: could only be changed in the code itself.

The StringPT class.

Constants: could be changed here if desired, but normally should not. These are of technical nature, as described for each. To avoid division by zero one must have sigma > 0.

bool useWidthPre

protected

Initialization data, to be read from Settings. Gaussian model.

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

include/Pythia8/FragmentationFlavZpT.h
src/FragmentationFlavZpT.cc

Public Member Functions

Protected Attributes

Static Protected Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation

Member Data Documentation