PYTHIA  8.312
Public Member Functions | List of all members
QEDsplitSystem Class Reference

Class for a QED splitting system. More...

#include <VinciaQED.h>

Inheritance diagram for QEDsplitSystem:
QEDsystem

Public Member Functions

 QEDsplitSystem ()
 Constructor.
 
void init (BeamParticle *beamAPtrIn, BeamParticle *beamBPtrIn, int verboseIn) override
 Initialize. More...
 
void prepare (int iSysIn, Event &event, double q2CutIn, bool isBelowHadIn, vector< double > evolutionWindowsIn, AlphaEM alIn) override
 Prepare list of final-state photons - with recoilers - for splittings. More...
 
void buildSystem (Event &event) override
 Build the splitting system. More...
 
double q2Next (Event &event, double q2Start) override
 Generate a scale for the system. More...
 
bool acceptTrial (Event &event) override
 Generate kinematics and check veto. More...
 
void updateEvent (Event &event) override
 Update Event. More...
 
bool isSplitting () override
 Branching type: isSplitting() = true.
 
void print () override
 Print the system.
 
- Public Member Functions inherited from QEDsystem
 QEDsystem ()
 Constructor.
 
virtual ~QEDsystem ()=default
 Destructor.
 
void initPtr (Info *infoPtrIn, ParticleData *particleDataPtrIn, PartonSystems *partonSystemsPtrIn, Rndm *rndmPtrIn, Settings *settingsPtrIn, VinciaCommon *vinComPtrIn)
 Initialize pointers. More...
 
virtual void setVerbose (int verboseIn)
 
virtual void updatePartonSystems ()
 Update the parton systems. More...
 
virtual bool isInitial ()
 

Additional Inherited Members

- Protected Attributes inherited from QEDsystem
InfoinfoPtr {}
 Pointers.
 
PartonSystemspartonSystemsPtr {}
 
ParticleDataparticleDataPtr {}
 
RndmrndmPtr {}
 
SettingssettingsPtr {}
 
LoggerloggerPtr {}
 
VinciaCommonvinComPtr {}
 
bool isInitPtr
 
int iSys
 Event system.
 
vector< Vec4pNew
 
int verbose
 Verbose setting.
 
int jNew
 Information for partonSystems.
 
map< int, int > iReplace
 
double shat
 

Detailed Description

Class for a QED splitting system.

Member Function Documentation

bool acceptTrial ( Event event)
overridevirtual

Generate kinematics and check veto.

Mark trial as used.

Set up some shorthands.

New momenta.

Safety check.

ij is the new pair, k is the spectator.

Check phase space.

Make sure any new qqbar pair has at least the invariant mass of the lightest meson. sijMin is 0 if these are not quarks.

Kernel veto.

Kinematics.

Done.

Implements QEDsystem.

void buildSystem ( Event event)
overridevirtual

Build the splitting system.

Verbose output.

Get rid of saved trial and clear all antennae.

Build lists of particles.

Only involve final state particles.

Find photons.

Find recoilers.

If no charged and no uncharged spectators, return.

Loop over photons.

If no charged spectators, use uncharged.

Check if there is another spectator than the current photon.

Continue to next photon if no spectator is available.

Select one at random that's not the photon itself.

Else use charged spectators.

Set up Ariadne factors.

Implements QEDsystem.

void init ( BeamParticle beamAPtrIn,
BeamParticle beamBPtrIn,
int  verboseIn 
)
overridevirtual

Initialize.

Class for a QED splitting system.

Initialize.

Implements QEDsystem.

void prepare ( int  iSysIn,
Event event,
double  q2CutIn,
bool  isBelowHadIn,
vector< double >  evolutionWindowsIn,
AlphaEM  alIn 
)
overridevirtual

Prepare list of final-state photons - with recoilers - for splittings.

Input.

Set up weights for splitting flavours.

Splittings for gamma->lepton+lepton-.

Only include gamma->qqbar if above hadronisation scale.

Total weight.

Build internal system.

Done.

Implements QEDsystem.

double q2Next ( Event event,
double  q2Start 
)
overridevirtual

Generate a scale for the system.

Return saved trial if we have one.

Check if there are any photons left.

Starting scale - account for cut on mGammaMax.

Check if qTrial is below the cutoff.

Find lower value from evolution window.

Compute weights.

If no antennae are active, don't generate new scale.

Generate scale and do alpha veto.

Check if evolution window was crossed.

Select antenna.

Select splitting ID.

Safety check.

Generate value of zeta and phi.

Done.

Implements QEDsystem.

void updateEvent ( Event event)
overridevirtual

Update Event.

Update event after splitting.

Clear information for replacing later in partonSystems

Set up the new fermions. Stochastic colour tag.

Shower may occur at a displaced vertex, or for unstable particle.

Change the event - add new particles.

Adjust old ones.

Save updates to be done on PartonSystems later.

Implements QEDsystem.


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