A splitting trial function for initial-initial, q -> gqbar. More...

#include <VinciaISR.h>

Inheritance diagram for TrialIISplitA:

Public Member Functions
virtual string	name () override
	Name of trial generator.

virtual double	aTrial (double saj, double sjb, double sAB) override
	A splitting trial function for initial-initial, q -> gqbar. More...

virtual double	getQ2 (double saj, double sjb, double sAB) override
	Evolution scale.

virtual double	getQ2max (double sAB, double, double) override

virtual double	genQ2run (double q2old, double sAB, double zMin, double zMax, double colFac, double PDFratio, double b0, double kR, double Lambda, double eA, double eB, double headroomFac=1.0, double enhanceFac=1.0) override
	Generate a new Q value, with first-order running alphaS. More...

virtual double	genQ2 (double q2old, double sAB, double zMin, double zMax, double colFac, double alphaSvalue, double PDFratio, double eA, double eB, double headroomFac=1.0, double enhanceFac=1.0) override
	Generate new Q value, with constant trial alphaS. More...

virtual double	genQ2thres (double q2old, double sAB, double zMin, double zMax, double colFac, double alphaSvalue, double PDFratio, int idA, int idB, double eA, double eB, bool useMpdf, double headroomFac=1.0, double enhanceFac=1.0) override

virtual double	genZ (double zMin, double zMax) override
	Generate a new zeta value in [zMin,zMax]. More...

virtual double	getIz (double zMin, double zMax) override
	The zeta integral (with alpha = 0). More...

virtual double	getZmin (double Qt2, double sAB, double eA, double eBeamUsed) override
	The zeta boundaries, for a given value of the evolution scale. More...

virtual double	getZmax (double Qt2, double sAB, double eA, double eBeamUsed) override

virtual double	getS1j (double Qt2, double zeta, double sAB) override
	Inverse transforms to obtain saj and sjb from Qt2 and zeta. More...

virtual double	getSj2 (double Qt2, double zeta, double sAB) override

virtual double	trialPDFratio (BeamParticle beamAPtr, BeamParticle beamBPtr, int iSys, int idA, int idB, double eA, double eB, double Qt2A, double Qt2B) override
	Trial PDF ratio.

Public Member Functions inherited from TrialGeneratorISR
	TrialGeneratorISR ()
	Constructor.

void	initPtr (Info *infoPtrIn)
	Initialize pointers. More...

virtual void	init (double mcIn, double mbIn)
	Initialize. More...

virtual double	getTrialPDFratio ()
	Return last trial PDF ratio.

bool	checkInit ()
	Check initialization.

int	trialFlav ()
	Return the last trial flavor.

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

Rndm *	rndmPtr {}

Settings *	settingsPtr {}

Logger *	loggerPtr {}

bool	useMevolSav
	Use m or pT evolution for collinear singularities.

double	shhSav
	s for hadron hadron.

int	trialFlavSav
	For conversion trial generators.

int	nGtoQISRSav

double	mbSav
	Masses.

double	mcSav

bool	sectorShower
	Doing a sector shower?

double	trialPDFratioSav
	Saved trial PDF ratio and trial tolerance.

double	TINYPDFtrial

Detailed Description

A splitting trial function for initial-initial, q -> gqbar.

Member Function Documentation

double aTrial	(	double	saj,
		double	sjb,
		double	sAB
	)

overridevirtual

A splitting trial function for initial-initial, q -> gqbar.

Trial antenna function. This trial used with PDF ratio <= const, so has sab/sAB prefactor.

Trial antenna function.

Reimplemented from TrialGeneratorISR.

Reimplemented in TrialIISplitB.

double genQ2	(	double	q2old,
		double	sAB,
		double	zMin,
		double	zMax,
		double	colFac,
		double	alphaSvalue,
		double	PDFratio,
		double	eA,
		double	eB,
		double	headroomFac = `1.0`,
		double	enhanceFac = `1.0`
	)

overridevirtual

Generate new Q value, with constant trial alphaS.

Generate a new Q value, with constant trial alphaS.

Sanity checks.

Enhance factors < 1: do not modify trial probability.

Generate new trial scale

Reimplemented from TrialGeneratorISR.

Reimplemented in TrialIISplitB.

double genQ2run	(	double	q2old,
		double	sAB,
		double	zMin,
		double	zMax,
		double	colFac,
		double	PDFratio,
		double	b0,
		double	kR,
		double	Lambda,
		double	eA,
		double	eB,
		double	headroomFac = `1.0`,
		double	enhanceFac = `1.0`
	)

overridevirtual

Generate a new Q value, with first-order running alphaS.

Generate new Q value, with first-order running alphaS. Same expression for QT and QA; Iz is different.

Sanity checks.

Enhance factors < 1: do not modify trial probability.

Generate new trial scale

Reimplemented from TrialGeneratorISR.

Reimplemented in TrialIISplitB.

double genQ2thres	(	double	q2old,
		double	sAB,
		double	zMin,
		double	zMax,
		double	colFac,
		double	alphaS,
		double	PDFratio,
		int	idA,
		int	idB,
		double	eA,
		double	eB,
		bool	useMpdf,
		double	headroomFac = `1.0`,
		double	enhanceFac = `1.0`
	)

overridevirtual

Generate new Q value, with running of the PDFs towards the mass threshold.

Generate a new Q value, with running of the PDFs towards the mass threshold.

Use only if the user wants to get rid of c and b quarks and use only in the right evolution window.

Sanity checks.

Enhance factors < 1: do not modify trial probability

Generate new trial scale

Reimplemented from TrialGeneratorISR.

Reimplemented in TrialIISplitB.

double genZ	(	double	zMin,
		double	zMax
	)

overridevirtual

Generate a new zeta value in [zMin,zMax].

Generate a new zeta value in [zMin,zMax]. For QT 1/(1+z3) distribution; for QA 1/z4 distribution.

Reimplemented from TrialGeneratorISR.

double getIz	(	double	zMin,
		double	zMax
	)

overridevirtual

The zeta integral (with alpha = 0).

The zeta integral (with alpha = 0). For QT integral dz4 1/(1+z3), for QA integral dz4 1/z4.

Reimplemented from TrialGeneratorISR.

double getS1j	(	double	Qt2,
		double	zeta,
		double	sAB
	)

overridevirtual

Inverse transforms to obtain saj and sjb from Qt2 and zeta.

If zeta < 0, swap invariants.

Sanity check.

Reimplemented from TrialGeneratorISR.

Reimplemented in TrialIISplitB.

double getSj2	(	double	Qt2,
		double	zeta,
		double	sAB
	)

overridevirtual

If zeta < 0, swap invariants.

Sanity check.

Reimplemented from TrialGeneratorISR.

double getZmax	(	double	Qt2,
		double	sAB,
		double	eA,
		double	eBeamUsed
	)

overridevirtual

Update in case of beam spread.

Reimplemented from TrialGeneratorISR.

double getZmin	(	double	Qt2,
		double	sAB,
		double	eA,
		double	eBeamUsed
	)

overridevirtual

The zeta boundaries, for a given value of the evolution scale.

Update in case of beam spread.

Reimplemented from TrialGeneratorISR.

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

include/Pythia8/VinciaISR.h
src/VinciaISR.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation