The HVStringZ class is used to sample the HV fragmentation function f(z). More...

#include <HiddenValleyFragmentation.h>

Inheritance diagram for HVStringZ:

Public Member Functions
	HVStringZ ()
	Constructor.

virtual	~HVStringZ ()
	Destructor.

void	preinit (int setabsigmaIn, double rescalebsigmaIn, double mVecRatioIn)
	Feed in extra parameters for HV handling, not part of base class. More...

bool	init () override
	Initialize data members. More...

double	zFrag (int idOld, int idNew=0, double mT2=1.) override
	Fragmentation function: top-level to determine parameters. More...

virtual double	stopMass () override
	Parameters for stopping in the middle; for now hardcoded.

virtual double	stopNewFlav () override

virtual double	stopSmear () override

Public Member Functions inherited from StringZ
	StringZ ()
	Constructor.

virtual	~StringZ ()
	Destructor.

virtual double	zLund (double a, double b, double c=1., double head=1., double bNow=0., int idFrag=0, bool isOldSQuark=false, bool isNewSQuark=false, bool isOldDiquark=false, bool isNewDiquark=false)
	Fragmentation function: select z according to provided parameters. More...

virtual double	zPeterson (double epsilon)

virtual double	zLundMax (double a, double b, double c=1.)
	Determine the maximum for zLund. More...

virtual double	aAreaLund ()
	a and b fragmentation parameters needed in some operations.

virtual double	bAreaLund ()

bool	deriveABLund (bool derivaA=false, bool deriveAExtraDiquark=false, bool deriveAExtraSQuark=false)
	Method to derive both a and b parameters (from <z> and RMSD(z)). More...

double	deriveBLund (double avgZ, double a, double mT2ref)
	Method to derive bLund from <z> (for fixed a and reference mT2). More...

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

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.

virtual void	onStat (vector< PhysicsBase * >, Pythia *)

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

Protected Attributes inherited from StringZ
bool	useNonStandC
	Initialization data, to be read from Settings.

bool	useNonStandB

bool	useNonStandH

bool	usePetersonC

bool	usePetersonB

bool	usePetersonH

bool	useOldAExtra

double	mc2

double	mb2

double	aLund

double	bLund

double	aExtraSQuark

double	aExtraDiquark

double	rFactC

double	rFactB

double	rFactH

double	aNonC

double	aNonB

double	aNonH

double	bNonC

double	bNonB

double	bNonH

double	epsilonC

double	epsilonB

double	epsilonH

double	stopM

double	stopNF

double	stopS

WeightsFragmentation *	wgtsPtr {}
	Fragmentation weights container.

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

mutex *	mutexPtr
	Mutex that should be locked for thread-unsafe code.

Static Protected Attributes inherited from StringZ
static const double	CFROMUNITY = 0.01
	Constants: could only be changed in the code itself. More...

static const double	AFROMZERO = 0.02

static const double	AFROMC = 0.01

static const double	EXPMAX = 50.
	Do not take exponent of too large or small number.

Detailed Description

The HVStringZ class is used to sample the HV fragmentation function f(z).

Member Function Documentation

bool init ( )

overridevirtual

Initialize data members.

Initialize data members of the string z selection.

Paramaters of Lund/Bowler symmetric fragmentation function.

Vector meson ratio used to rescale stop scale for fragmentation iteration.

Initialization succeeded.

Reimplemented from StringZ.

void preinit	(	int	setabsigmaIn,
		double	rescalebsigmaIn,
		double	mVecRatioIn
	)

Feed in extra parameters for HV handling, not part of base class.

The HVStringZ class is used to select z in HV fragmentation.

Feed in enhancement factors separately, so as not to break base class.

double zFrag	(	int	idOld,
		int	idNew = `0`,
		double	mT2 = `1.`
	)

overridevirtual

Fragmentation function: top-level to determine parameters.

Generate the fraction z that the next hadron will take using Lund/Bowler.

Shape parameters of Lund symmetric fragmentation function.

Reimplemented from StringZ.

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

include/Pythia8/HiddenValleyFragmentation.h
src/HiddenValleyFragmentation.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation