PYTHIA  8.303
Public Member Functions | List of all members
HVStringZ Class Reference

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

#include <HiddenValleyFragmentation.h>

Inheritance diagram for HVStringZ:
StringZ PhysicsBase

Public Member Functions

 HVStringZ ()
virtual ~HVStringZ ()
void init ()
 Initialize data members. More...
double zFrag (int idOld, int idNew=0, double mT2=1.)
 Fragmentation function: top-level to determine parameters. More...
virtual double stopMass ()
 Parameters for stopping in the middle; for now hardcoded.
virtual double stopNewFlav ()
virtual double stopSmear ()
- Public Member Functions inherited from StringZ
 StringZ ()
virtual ~StringZ ()
virtual double aAreaLund ()
 a and b fragmentation parameters needed in some operations.
virtual double bAreaLund ()
bool deriveBLund ()
 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

Additional Inherited Members

- Public Types inherited from PhysicsBase
enum  Status {
 Enumerate the different status codes the event generation can have.
- Protected Member Functions inherited from StringZ
double zLund (double a, double b, double c=1.)
 Fragmentation function: select z according to provided parameters. More...
double zPeterson (double epsilon)
- 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.
- Protected Attributes inherited from StringZ
bool useNonStandC
 Initialization data, to be read from Settings.
bool useNonStandB
bool useNonStandH
bool usePetersonC
bool usePetersonB
bool usePetersonH
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
- Protected Attributes inherited from PhysicsBase
InfoinfoPtr = {}
SettingssettingsPtr = {}
 Pointer to the settings database.
ParticleDataparticleDataPtr = {}
 Pointer to the particle data table.
HadronWidthshadronWidthsPtr = {}
 Pointer to the hadron widths data table.
RndmrndmPtr = {}
 Pointer to the random number generator.
CoupSMcoupSMPtr = {}
 Pointers to SM and SUSY couplings.
CoupSUSYcoupSUSYPtr = {}
BeamParticlebeamAPtr = {}
BeamParticlebeamBPtr = {}
BeamParticlebeamPomAPtr = {}
BeamParticlebeamPomBPtr = {}
BeamParticlebeamGamAPtr = {}
BeamParticlebeamGamBPtr = {}
BeamParticlebeamVMDAPtr = {}
BeamParticlebeamVMDBPtr = {}
PartonSystemspartonSystemsPtr = {}
 Pointer to information on subcollision parton locations.
SigmaTotalsigmaTotPtr = {}
 Pointer to the total/elastic/diffractive cross sections.
set< PhysicsBase * > subObjects
UserHooksPtr userHooksPtr
- 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

void init ( )

Initialize data members.

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

Initialize data members of the string z selection.

Paramaters of Lund/Bowler symmetric fragmentation function.

Use qv mass to set scale of bEff = b * m^2;

Mass of qv meson used to set stop scale for fragmentation iteration.

Reimplemented from StringZ.

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

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: