#include <VinciaAntennaFunctions.h>

Inheritance diagram for AntennaFunctionIX:

Public Member Functions
virtual bool	init () override
	Method to initialise (can be different than that of the base class). More...

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,B,a,b initial and j final.

virtual int	idB () const override

virtual int	id0 () const

virtual int	id1 () const override

virtual int	id2 () const

virtual double	zA (vector< double > invariants)
	Functions to get Altarelli-Parisi energy fractions.

virtual double	zB (vector< double > invariants)

virtual bool	isIIant ()
	Function to tell if this is an II antenna.

virtual bool	check () override
	Function to check singularities, positivity, etc. More...

Public Member Functions inherited from AntennaFunction
	AntennaFunction ()=default
	Constructor.

virtual	~AntennaFunction ()
	Destructor.

virtual double	antFun (vector< double > invariants, vector< double > mNew, vector< int > helBef, vector< int > helNew)=0
	The antenna function [GeV^-2].

virtual double	AltarelliParisi (vector< double > invariants, vector< double > mNew, vector< int > helBef, vector< int > helNew)=0

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 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 AntennaFunctionIX, base class for initial-initial and initial-final antenna functions which implements II. All derived classes for initial-initial antenna functions are the same for global and sector cases since even the global ones include sector terms representing "emission into the initial state".

Member Function Documentation

bool check ( )

overridevirtual

Function to check singularities, positivity, etc.

Function to check singularities, positivity, etc. For initial-initial: sab = sAB + saj + sjb.

For check for positivity.

Z and Higgs as testing case.

Check soft singularity against dipole factor.

Test one symmetric and one asymmetric soft phase-space point.

Test two sAB values.

Test invariants.

saj/sab

sjb/sab

1 = sAB/sab + yaj + yjb.

Compute eikonal.

Compute antenna (without subleading-colour corrections).

Compare.

Test all helicity configurations for collinearity and posivity.

Gluon emission.

Massless: quark helicities must be conserved.

For gluons, sector terms can give helicity flips

Do not allow helicity flips on both sides simultaneously

Gluon conversion.

Helicity of recoiler must be conserved.

Massless: quark helicity must be conserved.

Gluon splitting.

Helicity of recoiler must be conserved.

Massless: quark helicity must be conserved.

Test invariants, for a few points along collinear axis.

Test two sAB values.

Test invariants.

saj/sab

sjb/sab

1 = sAB/sab + yaj + yjb

Compute AP kernels.

Compute antennae (without subleading colour corrections).

Check if only a singularity on one side exists (-> z = -1).

Require better than 5% agreement unless dominated by non-singular.

Check for positivity and dead zones.

sAB^0.5 between 1 and 1000 GeV.

Generate a random point in phase-space triangle.

saj/sab

sjb/sab

Compute sab from 1 = sAB/sab + yaj + yjb.

Check that sab < shhMax.

Compute antenna.

Check positivity (strict).

Check for dead zones away from phase-space boundary

Verbose output

End loop over helicities.

Reimplemented from AntennaFunction.

Reimplemented in AntennaFunctionIF.

bool init ( )

overridevirtual

Method to initialise (can be different than that of the base class).

AntennaFunctionIX class.

Method to initialise (can be different than that of the base class).

Check whether pointers are initialized.

Subleading-colour treatment. modeSLC = 0: all gluon-emission antennae normalised to CA. modeSLC = 1: use colour factors as specified by user. modeSLC = 2: QQ gets CF, GG gets CA, QG gets interpolation.

Sector shower on/off and sectorDamp parameter.

Collinear partitioning (for global antennae).

Return OK.

Reimplemented from AntennaFunction.

Reimplemented in AntennaFunctionIF.

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

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

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation