Class BrancherSplitFF, branch elemental for 2->3 gluon splittings. More...

#include <VinciaFSR.h>

Inheritance diagram for BrancherSplitFF:

Public Member Functions
	BrancherSplitFF (int iSysIn, Event &event, bool sectorShowerIn, vector< int > iIn, ZetaGeneratorSet *zetaGenSet)
	Create branch elemental for antenna(e) with parents in iIn. More...

	BrancherSplitFF (int iSysIn, Event &event, bool sectorShowerIn, int iIn0, int iIn1, bool col2acol, ZetaGeneratorSet *zetaGenSet)

void	initBrancher (ZetaGeneratorSet *zetaGenSet, bool col2acolIn=true)
	Method to initialise data members specific to BrancherSplitFF. More...

virtual bool	isXG () const

virtual int	idNew () const
	Flavour and mass of emitted particle.

virtual double	mNew () const

double	genQ2 (int evTypeIn, double q2MaxNow, Rndm rndmPtr, Logger loggerPtr, const EvolutionWindow *evWindowPtrIn, double colFac, vector< double > headroomIn, vector< double > enhanceFacIn, int verboseIn)
	Generate a new Q2 value . More...

virtual bool	genInvariants (vector< double > &invariants, Rndm rnmdPtr, int verboseIn, Logger loggerPtr)

virtual double	pAccept (const double antPhys, Logger *loggerPtr, int verboseIn)

double	getQ2Max (int evType)
	Getter and setter methods.

virtual vector< double >	setmPostVec ()

virtual void	setidPost ()
	Set post-branching IDs and masses. Base class is for gluon emission.

virtual void	setStatPost ()

virtual void	setMaps (int sizeOld)

virtual bool	getNewParticles (Event &event, vector< Vec4 > momIn, vector< int > hIn, vector< Particle > &pNew, Rndm , VinciaColour )
	Generic getter method. Assumes setter methods called earlier. More...

Public Member Functions inherited from Brancher
	Brancher (int iSysIn, Event &event, bool sectorShowerIn, vector< int > iIn)
	Main base class constructor.

	Brancher (int iSysIn, Event &event, bool sectorShowerIn, int iIn0, int iIn1, int iIn2=0)
	Wrapper for 2- and 3-parton parents.

virtual	~Brancher ()
	Base class must have a virtual destructor.

void	reset (int iSysIn, Event &event, vector< int > iIn)
	Reset (common functionality implemented in base class). More...

void	reset (int iSysIn, Event &event, int i0In, int i1In, int i2In=0)
	Wrapper for simple 2- (or 3-) parton antennae.

int	i0 () const
	Methods to get (explicit for up to 3 parents, otherwise just use iVec).

int	i1 () const

int	i2 () const

int	iVec (unsigned int i) const

vector< int >	iVec ()

int	id0 () const

int	id1 () const

int	id2 () const

vector< int >	idVec () const

int	colType0 () const

int	colType1 () const

int	colType2 () const

vector< int >	colTypeVec () const

int	col0 () const

int	col1 () const

int	col2 () const

vector< int >	colVec () const

int	acol0 () const

int	acol1 () const

int	acol2 () const

vector< int >	acolVec () const

int	h0 () const

int	h1 () const

int	h2 () const

vector< int >	hVec () const

double	m0 () const

double	m1 () const

double	m2 () const

vector< double >	mVec () const

vector< double >	getmPostVec ()

int	colTag ()

int	system () const
	Methods to return saved/derived quantities.

double	mAnt () const

double	m2Ant () const

double	sAnt () const

double	kallenFac () const

double	enhanceFac () const

double	q2Trial () const

enum AntFunType	antFunTypePhys () const

virtual double	getpTscale ()
	Compute pT scale of trial branching.

virtual double	getXj ()
	Return Xj.

virtual void	list (string header="none", bool withLegend=true) const
	Simple print utility, showing the contents of the Brancher. More...

virtual int	iNew ()
	Return index of new particle (slightly arbitrary choice for splittings).

virtual int	posR () const

virtual int	posF () const

virtual int	getSector ()
	Return sector label.

enum BranchType	getBranchType ()
	Return branch type.

bool	isSwapped ()
	Check if swapped.

vector< double >	getInvariants ()
	Return the saved invariants.

void	resetEnhanceFac (const double enhanceIn)
	This method allows to reset enhanceFac if we do an accept/reject.

bool	hasTrial () const

void	needsNewTrial ()
	Method to mark new trial needed without erasing current one.

void	eraseTrial ()
	Method to mark new trial needed and erase current one.

Additional Inherited Members
Public Attributes inherited from Brancher
shared_ptr< TrialGenerator >	trialGenPtr = {}
	Object to perform trial generation.

map< int, pair< int, int > >	mothers2daughters
	Publicly accessible members for storing mother/daughter connections.

map< int, pair< int, int > >	daughters2mothers

Protected Attributes inherited from Brancher
int	systemSav {}
	Data members for storing information about parent partons.

vector< int >	iSav

vector< int >	idSav

vector< int >	colTypeSav

vector< int >	hSav

vector< int >	colSav

vector< int >	acolSav

vector< int >	idPostSav

vector< int >	statPostSav

vector< double >	mSav

vector< double >	mPostSav

int	colTagSav {}

int	evTypeSav {}

const EvolutionWindow *	evWindowSav {}
	All alphaS information.

double	mAntSav {}
	Saved antenna mass parameters.

double	m2AntSav {}

double	kallenFacSav {}

double	sAntSav {}

bool	hasTrialSav {false}
	Data members for storing information about generated trial branching.

double	headroomSav {1.}

double	enhanceSav {1.}

double	q2BegSav {}

double	q2NewSav {}

vector< double >	invariantsSav

bool	swapped {false}
	If true, flip identities of A and B.

bool	sectorShower {}
	Parameters for the sector shower.

int	iSectorWinner {}

Detailed Description

Class BrancherSplitFF, branch elemental for 2->3 gluon splittings.

Constructor & Destructor Documentation

BrancherSplitFF	(	int	iSysIn,
		Event &	event,
		bool	sectorShowerIn,
		vector< int >	iIn,
		ZetaGeneratorSet *	zetaGenSet
	)

inline

Create branch elemental for antenna(e) with parents in iIn.

Initialise derived-class members and set up trial generator.

BrancherSplitFF	(	int	iSysIn,
		Event &	event,
		bool	sectorShowerIn,
		int	iIn0,
		int	iIn1,
		bool	col2acol,
		ZetaGeneratorSet *	zetaGenSet
	)

inline

Wrapper to provide simple 2-parton systems as parents. Set if it is the anticolour or colour side of the gluon that participates in the antenna (used to decide pTj or pTi measure).

Initialise derived-class members and set up trial generator.

Member Function Documentation

bool genInvariants	(	vector< double > &	invariants,
		Rndm *	rndmPtr,
		int	verboseIn,
		Logger *	loggerPtr
	)

virtual

Generate complementary invariant(s) for saved trial scale for gluon splitting. Return false if no physical kinematics possible.

Clear output vector, and check if we have a sensible q2New scale.

pT evolution.

Here i=q, j=qbar is always the case, but change def for sjk, sik depending on who is colour connected to the recoiler.

Veto if point outside the available phase space.

Reimplemented from Brancher.

double genQ2	(	int	evTypeIn,
		double	q2MaxNow,
		Rndm *	rndmPtr,
		Logger *	loggerPtr,
		const EvolutionWindow *	evWindowPtrIn,
		double	colFac,
		vector< double >	headroomIn,
		vector< double >	enhanceFacIn,
		int	verboseIn
	)

virtual

Generate a new Q2 value .

Generate a new Q2 scale (collinear 1/(2q2) implementation) with constant trial alphaS.

Set current phase space limits and active sectors.

Initialise output value and save input parameters.

Total splitting weight summed over flavours

First check if there is any phase space open for this flavour

pT evolution.

Generate Q2 and save winning sector.

Select flavour.

Set quark masses.

Save corresponding headroom and enhancement factors.

Sanity checks.

Set flag that this call produces a saved trial.

Implements Brancher.

bool getNewParticles	(	Event &	event,
		vector< Vec4 >	momIn,
		vector< int >	hIn,
		vector< Particle > &	pNew,
		Rndm *	,
		VinciaColour *
	)

virtual

Generic getter method. Assumes setter methods called earlier.

Initialize.

Check everything set.

Now populate particle vector.

Implements Brancher.

void initBrancher	(	ZetaGeneratorSet *	zetaGenSet,
		bool	col2acolIn = `true`
	)

Method to initialise data members specific to BrancherSplitFF.

Class BrancherSplitFF, branch elemental for 2->3 gluon splittings.

Method to initialise data members specific to BrancherSplitFF.

virtual bool isXG ( ) const

inlinevirtual

Method to check if it is the colour (false) or anticolour (true) side of the gluon that is splitting, corresponding to the quark or antiquark being regarded as the emitted parton respectively.

double pAccept	(	const double	antPhys,
		Logger *	loggerPtr,
		int	verboseIn
	)

virtual

Compute antPhys/antTrial for gluon splittings, given antPhys. Note, antPhys should be normalised to include charge and coupling factors.

pT evolution.

Reimplemented from Brancher.

void setMaps ( int sizeOld )

virtual

For updating the children of existing parents.

For adding mothers of new children.

Reimplemented from Brancher.

vector< double > setmPostVec ( )

virtual

mi

mj

mk

Reimplemented from Brancher.

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

include/Pythia8/VinciaFSR.h
src/VinciaFSR.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation