AntQGEmitIF Class Reference

Class AntQGEmitIF, initial-final antenna function. More...

#include <VinciaAntennaFunctions.h>

Inheritance diagram for AntQGEmitIF:

Public Member Functions
virtual string	vinciaName () const override
	Names (remember to redefine both for each inherited class).
virtual int	idA () const override
	Parton types AB -> 0a 1j 2b with A,a initial and B,b,j final.
virtual int	idB () const override
virtual int	id0 () const override
virtual int	id1 () const override
virtual int	id2 () const override
virtual double	antFun (vector< double > invariants, vector< double > masses, vector< int > helBef, vector< int > helNew) override
	The antenna function [GeV^-2]. More...
virtual double	AltarelliParisi (vector< double > invariants, vector< double >, vector< int > helBef, vector< int > helNew) override
	The AP kernel, P(z)/Q2. More...
Public Member Functions inherited from AntennaFunctionIF
virtual bool	init () override
	Method to initialise (can be different than that of the base class). More...
virtual bool	check () override
	Function to check singularities, positivity, etc. More...
virtual double	zA (vector< double > invariants) override
	Functions to get Altarelli-Parisi energy fractions.
virtual double	zB (vector< double > invariants) override
virtual bool	isIIant () override
	Methods to tell II, IF, and RF apart.
virtual bool	isRFant ()
virtual bool	checkRes ()
	Check for resonances. More...
virtual void	getTestMasses (vector< double > &masses)
	Create the test masses for the checkRes method.
virtual bool	getTestInvariants (vector< double > &invariants, vector< double > masses, double yaj, double yjk)
	Create the test invariants for the checkRes method.
Public Member Functions inherited from AntennaFunction
	AntennaFunction ()=default
	Constructor.
virtual	~AntennaFunction ()
	Destructor.
virtual string	baseName () const
	Construct baseName from idA, idB, and id1.
virtual string	humanName () const
	Wrapper that can modify baseName to more human readable form if required.
virtual void	initMasses (vector< double > *masses)
	Method to intialise mass values.
virtual int	initHel (vector< int > *helBef, vector< int > *helNew)
	Method to initialise internal helicity variables. More...
double	antFun (vector< double > invariants, vector< double > masses)
	Wrapper for helicity-summed/averaged antenna function.
double	antFun (vector< double > invariants)
	Wrapper for massless, helicity-summed/averaged antenna function.
double	AltarelliParisi (vector< double > invariants, vector< double > masses)
	Wrapper without helicity assignments.
double	AltarelliParisi (vector< double > invariants)
	Wrapper for massless helicity-summed/averaged DGLAP kernels.
void	initPtr (Info *infoPtrIn, DGLAP *dglapPtrIn)
	Initialize pointers. More...
double	chargeFac ()
	Get parameters.
int	kineMap ()
double	alpha ()
double	sectorDamp ()
double	zA (vector< double > invariants)
	Functions to get Altarelli-Parisi energy fractions from invariants.
double	zB (vector< double > invariants)
string	id2str (int id) const
	Auxiliary function to translate an ID code to a string. More...

Additional Inherited Members
Protected Member Functions inherited from AntennaFunctionIF
double	massiveEikonal (double saj, double sjk, double sak, double m_a, double m_k)
double	massiveEikonal (vector< double > invariants, vector< double > masses)
	Massive eikonal factor, given invariants and masses.
double	gramDet (vector< double > invariants, vector< double > masses)
	Return the Gram determinant.
double	antFunCollLimit (vector< double > invariants, vector< double > masses)
Protected Attributes inherited from AntennaFunction
bool	isInitPtr {false}
	Is initialized.
bool	isInit {false}
double	chargeFacSav {0.0}
	Charge factor, kinematics map, and subleading-colour treatment.
int	kineMapSav {0}
int	modeSLC {-1}
bool	sectorShower {false}
double	alphaSav {0.0}
	The alpha collinear-partitioning parameter.
double	sectorDampSav {0.0}
	The sector-shower collinear dampening parameter.
double	term {}
	Shorthand for commonly used variable(s).
double	preFacFiniteTermSav {0.0}
double	antMinSav {0.0}
bool	isMinVar {}
double	mi {0.0}
	Variables for internal storage of masses and helicities.
double	mj {0.0}
double	mk {0.0}
int	hA {9}
int	hB {9}
int	hi {9}
int	hj {9}
int	hk {9}
map< int, bool >	LH {{9, true}, {1, false}, {-1, true}}
map< int, bool >	RH {{9, true}, {1, true}, {-1, false}}
int	verbose {1}
	Verbosity level.
Info *	infoPtr {}
	Pointers to Pythia8 classes.
ParticleData *	particleDataPtr {}
Settings *	settingsPtr {}
Rndm *	rndmPtr {}
Logger *	loggerPtr {}
DGLAP *	dglapPtr {}
	Pointer to VINCIA DGLAP class.
vector< double >	mDum {0, 0, 0, 0}
	Dummy vectors.
vector< int >	hDum {9, 9, 9, 9}

Detailed Description

Class AntQGEmitIF, initial-final antenna function.

Member Function Documentation

double AltarelliParisi ( vector< double >  invariants, vector< double >  , vector< int >  helBef, vector< int >  helNew  )

overridevirtual

The AP kernel, P(z)/Q2.

Sanity check. Require positive invariants.

Store helicities.

Collinear to initial-state quark.

Collinear to final-state gluon.

Implements AntennaFunction.

Reimplemented in AntQGEmitRFsec, and AntQGEmitRF.

double antFun ( vector< double >  invariants, vector< double >  masses, vector< int >  helBef, vector< int >  helNew  )

overridevirtual

The antenna function [GeV^-2].

Class AntQGEmitIF, initial-final antenna function.

The antenna function [GeV^-2].

Invariants and helicities.

Sanity check. Require positive invariants.

Initialise masses and helicities. Return 0 for unphysical helicities.

Shorthands.

Do helicity sum.

(++ and –) parents.

++ > +++ && – > — antennae (MHV).

++ > +-+ && – > -+- antennae (NMHV).

++ > –+ && – > ++- antennae (massive helicity flip).

(+- and -+) parents.

+- > ++- && -+ > –+ antennae.

+- > +– && -+ > -++ antennae.

+- > — && -+ > +++ antennae (massive helicity flip).

Subleading colour correction. Note: has to be applied to sector antennae after symmetrisation!

Return helicity sum, averaged over initial helicities.

Implements AntennaFunction.

Reimplemented in AntQGEmitIFsec.

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

• include/Pythia8/VinciaAntennaFunctions.h
• src/VinciaAntennaFunctions.cc