Class for a QED conversion system. More...

#include <VinciaQED.h>

Inheritance diagram for QEDconvSystem:

Public Member Functions
	QEDconvSystem ()
	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 for backwards-evolution of photons. More...

void	buildSystem (Event &event) override
	Build the system. More...

double	q2Next (Event &event, double q2Start) override
	Generate a trial scale. More...

bool	acceptTrial (Event &event) override
	Generate kinematics and check veto. More...

void	updateEvent (Event &event) override
	Update. More...

bool	isInitial () override
	Branching type: isInitial() = true.

void	print () override
	Print.

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	isSplitting ()
	Methods to tell which type of brancher this is.

Additional Inherited Members
Protected Attributes inherited from QEDsystem
Info *	infoPtr {}
	Pointers.

PartonSystems *	partonSystemsPtr {}

ParticleData *	particleDataPtr {}

Rndm *	rndmPtr {}

Settings *	settingsPtr {}

Logger *	loggerPtr {}

VinciaCommon *	vinComPtr {}

bool	isInitPtr

int	iSys
	Event system.

vector< Vec4 >	pNew

int	verbose
	Verbose setting.

int	jNew
	Information for partonSystems.

map< int, int >	iReplace

double	shat

Detailed Description

Class for a QED conversion system.

Member Function Documentation

bool acceptTrial ( Event & event )

overridevirtual

Generate kinematics and check veto.

Check the veto.

Mark trial as used.

Conversion mass.

Spectator ID.

Old momenta.

Clear new momenta.

Note that we treat the initial state as massless and the final state as massive. q2 is defined as saj - 2*mf2, but otherwise we adhere to the proper kinematics.

Check kinematic boundaries.

Check if photon is in beam a or b.

Global recoil momenta.

Kinematics.

Check if new energies don't exceed hadronic maxima.

Kernel veto probability.

Compute pdf ratios.

Photon pdf.

Spectator pdf.

Photon pdf.

Spectator pdf.

Pdf ratio veto probability.

Do veto.

Done.

Implements QEDsystem.

void buildSystem ( Event & event )

overridevirtual

Build the system.

Get rid of saved trial.

Get initial states.

Implements QEDsystem.

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

overridevirtual

Initialize.

Class for a QED conversion system.

Initialize the system.

Verbosity setting.

Settings, number of incoming flavours to allow conversions to. Could be extended to allow top quarks in future; for now up to b.

Set trial pdf ratios.

Constants.

Beam pointers.

Implements QEDsystem.

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

overridevirtual

Prepare for backwards-evolution of photons.

Input.

Set up weights for conversion flavours.

If switched off, do nothing.

Only do conversions to quarks if above hadronisation scale.

Total weights.

Build system.

Done.

Implements QEDsystem.

double q2Next	(	Event &	event,
		double	q2Start
	)

overridevirtual

Generate a trial scale.

Return saved trial if we have one.

Check if there are any initial-state photons.

Select a photon.

Two photon antennae -> twice the weight.

Starting scale.

Check if qTrial is below the cutoff.

Find lower value from evolution window.

Iz integral.

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

Generate scale and do alpha veto.

Check if evolution window was crossed.

Select conversion ID.

Implements QEDsystem.

void updateEvent ( Event & event )

overridevirtual

Update.

Update event after QED conversion.

Clear information for replacing later in partonSystems

Conversion mass

Set up new particles.

Stochastic colour tag.

Change daughters of beams for hard process.

Update event for global recoil.

Copy the recoiler.

Change the momentum.

Save update to do on PartonSystems later.

Save updates to do on PartonSystems later.

Update beams.

Check if photon is in beam a or b

Redo choice of valence/sea/companion kind.

Done.

Implements QEDsystem.

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

include/Pythia8/VinciaQED.h
src/VinciaQED.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation