Final-final electroweak antenna. More...

#include <VinciaEW.h>

Inheritance diagram for EWAntennaFF:

Public Member Functions
virtual bool	init (Event &event, int iMotIn, int iRecIn, int iSysIn, vector< EWBranching > &branchings, Settings *settingsPtr) override
	Overridden virtual functions. More...

virtual double	generateTrial (double q2Start, double q2End, double alphaIn) override
	Generate a trial. More...

virtual bool	acceptTrial (Event &event) override
	Accept trial. More...

virtual void	updateEvent (Event &event) override
	Update an event. More...

Public Member Functions inherited from EWAntenna
	EWAntenna ()
	Constructor and destructor.

void	print ()
	Print, must be implemented by base classes.

void	initPtr (Info infoPtrIn, VinciaCommon vinComPtrIn, AlphaEM alphaPtrIn, AmpCalculator ampCalcPtrIn)
	Initialize pointers.

void	setVerbose (int verboseIn)
	Set verbosity level.

virtual void	updatePartonSystems (Event &event)
	Base class for an electroweak antenna. More...

int	getIndexMot ()
	Return index.

int	getIndexRec ()

bool	isSplitToFermions ()
	Check if splitting to fermions, inital, or resoance.

virtual bool	isInitial ()

virtual bool	isResonanceDecay ()

bool	selectChannel (int idx, const double &cSum, const map< double, int > &cSumSoFar, int &idi, int &idj, double &mi2, double &mj2)
	Select a channel.

Additional Inherited Members
Protected Attributes inherited from EWAntenna
int	iMot
	Indices, PID, and polarization of I, K in Pythia event record.

int	iRec

int	idMot

int	idRec

int	polMot

Vec4	pMot
	Momenta of antenna constituents.

Vec4	pRec

double	sAnt
	Masses and invariants of antenna constituents.

double	mMot

double	mMot2

double	mRec

double	mRec2

double	alpha
	Overestimate of QED coupling.

int	iSys
	Parton system this antenna is part of.

vector< EWBranching >	brVec
	EW branchings.

bool	hasTrial
	Trial variables.

double	q2Trial

double	sijTrial

double	sjkTrial

int	poliTrial

int	poljTrial

vector< Vec4 >	pNew
	Outgoing momenta after branching.

double	c0Sum
	Info on coefficents.

double	c1Sum

double	c2Sum

double	c3Sum

map< double, int >	c0SumSoFar

map< double, int >	c1SumSoFar

map< double, int >	c2SumSoFar

map< double, int >	c3SumSoFar

double	q2Match
	Matching scale.

int	jNew
	Information for partonSystems.

unordered_map< int, int >	iReplace

double	shat

EWBranching *	brTrial {}
	Pointers.

Info *	infoPtr {}

Rndm *	rndmPtr {}

Logger *	loggerPtr {}

PartonSystems *	partonSystemsPtr {}

VinciaCommon *	vinComPtr {}

AlphaEM *	alphaPtr {}

AmpCalculator *	ampCalcPtr {}

bool	doBosonInterference
	Settings.

int	verbose
	Verbosity.

Detailed Description

Final-final electroweak antenna.

Member Function Documentation

bool acceptTrial ( Event & event )

overridevirtual

Accept trial.

Mark trial as used.

Get some variables.

Check on-shell phase space.

Make sure any new qqbar pair has at least the invariant mass of the lightest meson. sijMin is 0 if these are not quarks.

Construct veto probability, alpha ratio.

Trial kernel - uses kinematic mass of pMot.

Physical kernels per final state spin config - width = 0.

Sums and cumulants for spin states.

Antenna ratio.

Check if veto probability is ok.

Accept/Reject step.

Passed veto - now select a spin state.

Sample Breit-Wigner masses for the kinematics. Don't change resonance mass in an emission.

Recompute invariants to conserve Q2.

Check off-shell phase space.

Check if we veto resonance production with off-shellness larger than q2.

Proceed to do the kinematics. Pre- and post-branching momenta, phi, invariants, masses.

Do kinematics and return.

Apply bosonic interference factor.

Branching accepted!

Implements EWAntenna.

Reimplemented in EWAntennaFFres.

double generateTrial	(	double	q2Start,
		double	q2End,
		double	alphaIn
	)

overridevirtual

Generate a trial.

Auxiliary phase space variable ranges. All branching are generated in one go. This implementation overestimates z ranges in massless approx.

Antenna mass is too small for radiation.

Expand square root to prevent numerical issues.

Zeta integrals and trial generation weights.

Find the highest new trial scale and generate scale from c0.

Compute the trial invariants. Use the kinematic mass of pMot here.

Generate scale from c1.

Compute the trial invariants. Use the kinematic mass of pMot here.

Generate scale from c2.

Local veto is required for this trial.

Compute the trial invariants. Use the kinematic mass of pMot here.

Local veto probability to fix the trial distribution. Note that pAccept may be > 1 if sijNow < 0. This is not an issue because these trials get vetoed in acceptTrial.

Save the trial.

Generate scale from c3.

Compute the trial invariants. Use the kinematic mass of pMot here.

Return trial.

Implements EWAntenna.

Reimplemented in EWAntennaFFres.

bool init	(	Event &	event,
		int	iMotIn,
		int	iRecIn,
		int	iSysIn,
		vector< EWBranching > &	branchings,
		Settings *	settingsPtr
	)

overridevirtual

Overridden virtual functions.

Final-final electroweak antenna.

Initialize.

Settings.

Initialize variables.

The shower always uses the on-shell mass of mI. mRec only acts as recoiler, so we just use the kinematic mass.

This function is part of phase space, It is computed with the kinematic masses.

Store the system and branchings.

Find coefficients for overestimates.

Implements EWAntenna.

Reimplemented in EWAntennaFFres.

void updateEvent ( Event & event )

overridevirtual

Update an event.

Clear information for replacing later in partonSystems.

Fetch ids and kinematic masses.

If new particles are qqbar pair, we need new color indices.

Otherwise carry I color indices to i.

Adjust old particles.

Save information for parton systems.

Implements EWAntenna.

Reimplemented in EWAntennaFFres.

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

include/Pythia8/VinciaEW.h
src/VinciaEW.cc

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation