#include <VinciaISR.h>

Inheritance diagram for TrialGeneratorISR:

Public Member Functions
	TrialGeneratorISR ()
	Constructor.

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

virtual string	name ()
	Name of trial generator.

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

virtual double	aTrial (double saj, double sjb, double sAB)
	Trial antenna function. More...

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

virtual double	getQ2max (double sAB, double, double)

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)
	Generate 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)
	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)

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

virtual double	getIz (double zMin, double zMax)
	The zeta integral.

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

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

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

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

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

virtual double	getTrialPDFratio ()
	Return last trial PDF ratio.

bool	checkInit ()
	Check initialization.

int	trialFlav ()
	Return the last trial flavor.

Protected Attributes
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

Base class for initial-state trial generators. Note, base class is coded for a soft-eikonal trial function.

Member Function Documentation

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

virtual

Trial antenna function.

Trial antenna function. Convention for what is coded here: when using x*PDF ratio <= const : aTrial when using PDF ratio <= const : aTrial * sab / sAB Base class implements soft eikonal with PDF ratio as overestimate.

Reimplemented in TrialIFConvA, TrialIFSplitK, TrialIFSplitA, TrialIFGCollK, TrialIFGCollA, TrialVFSoft, TrialIFSoft, TrialIIConvB, TrialIIConvA, TrialIISplitB, TrialIISplitA, TrialIIGCollB, and TrialIIGCollA.

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`
	)

virtual

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 in TrialIFConvA, TrialIFSplitK, TrialIFSplitA, TrialIFGCollK, TrialIFGCollA, TrialIFSoft, TrialIIConvB, TrialIIConvA, TrialIISplitB, TrialIISplitA, and TrialIIGCollA.

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`
	)

virtual

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

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

Sanity checks.

Enhance factors < 1: do not modify trial probability.

Constants.

Generate new scale.

Reimplemented in TrialIFConvA, TrialIFSplitK, TrialIFSplitA, TrialIFGCollK, TrialIFGCollA, TrialIFSoft, TrialIIConvB, TrialIIConvA, TrialIISplitB, TrialIISplitA, and TrialIIGCollA.

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`
	)

virtual

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

Reimplemented in TrialIFSplitA, TrialIISplitB, and TrialIISplitA.

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

virtual

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

If zeta < 0, swap invariants.

Sanity check.

Reimplemented in TrialIFConvA, TrialIFSplitK, TrialIFSplitA, TrialIFGCollK, TrialIFGCollA, TrialIFSoft, TrialIIConvB, TrialIIConvA, TrialIISplitB, TrialIISplitA, TrialIIGCollB, and TrialIIGCollA.

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

virtual

If zeta < 0, swap invariants.

Sanity check.

Reimplemented in TrialIFConvA, TrialIFSplitK, TrialIFSplitA, TrialIFGCollK, TrialIFGCollA, TrialIFSoft, TrialIIConvA, TrialIISplitA, and TrialIIGCollA.

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

virtual

Update in case of beam spread.

Reimplemented in TrialIFGCollK, TrialIIConvA, TrialIISplitA, and TrialIIGCollA.

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

virtual

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

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

Update in case of beam spread.

Reimplemented in TrialIFConvA, TrialIFSplitK, TrialIFSplitA, TrialIFGCollK, TrialIFGCollA, TrialIFSoft, TrialIIConvA, TrialIISplitA, and TrialIIGCollA.

void init	(	double	mcIn,
		double	mbIn
	)

virtual

Initialize.

TODO: this version of VINCIA uses PT evolution for all branchings.

s for hadron hadron.

Number of active quark flavours.

For conversion trial generators.

Masses.

Sector shower.

Saved trialPDF ratio.

void initPtr ( Info * infoPtrIn )

Initialize pointers.

Base class for initial-state trial generators.

Initialize pointers.

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

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

Public Member Functions

Protected Attributes

Detailed Description

Member Function Documentation