WeightsFragmentation Class Reference

#include <Weights.h>

Inheritance diagram for WeightsFragmentation:

Public Types
enum	FactIndex { Z, Flav, PT }
	Factorization indices.

Public Member Functions
	~WeightsFragmentation ()
	Destructor. More...
void	init () override
	Initialize the weights. More...
void	clear () override
	Clear the weights.
int	nWeightGroups () const
string	getGroupName (int iGN) const
double	getGroupWeight (int iGW) const
	Return group weight.
void	collectWeightNames (vector< string > &outputNames) override
	Collect fragmentation weight names. More...
void	collectWeightValues (vector< double > &outputWeights, double norm=1.) override
	Collect fragmentation weight values.
vector< double >	flavParms (double xi, double rho, double x, double y)
	Calculate the derived flavour parameters. More...
double	flavWeight (const vector< double > &parms)
	Calculate a flavour weight.
double	flavWeight (const vector< double > &parms, const vector< int > &breaks)
	Calculate a flavor weight, given the derived parameters and breaks. More...
double	zWeight (double aLund, double bLund, double rFactC, double rFactB, int idOld, int idNew, double mT2, double z, double fPrel)
	Calculate kinematic weights. More...
double	pTWeight (double sigma, double pT2, double mult)
Public Member Functions inherited from WeightsBase
virtual void	init (bool)
virtual void	bookVectors (vector< double > weights, vector< string > names)
string	getWeightsName (int iPos) const
virtual double	getWeightsValue (int iPos) const
int	getWeightsSize () const
void	bookWeight (string name, double defaultValue=1.)
	Function to create a new, synchronized, pair of weight name and value. More...
void	setValueByIndex (int iPos, double val)
	Functions to set values of weights.
void	setValueByName (string name, double val)
virtual void	reweightValueByIndex (int iPos, double val)
	Functions to reweight weight values, by index or by name.
virtual void	reweightValueByName (string name, double val)
int	findIndexOfName (string name)
void	setPtrs (Info *infoPtrIn)
	Set the pointers.

Public Attributes
vector< map< vector< double >, int > >	weightParms {}
	Vectors for weight group handling.
vector< string >	externalGroupNames {}
vector< vector< int > >	externalMap {}
vector< int >	flavBreaks
	Track the breaks needed for flavour reweighting.
vector< int >	zIntBreaks
vector< double >	zDblBreaks
vector< double >	pTBreaks

Friends
class	StringFlav
	Friends for fragmentation reweighitng.
class	StringZ
class	StringPT

Additional Inherited Members
Protected Member Functions inherited from WeightsBase
void	parse (string wvecKey, map< string, map< string, double > > &dct)
	Parse a WVec of variations into a dictionary. More...
Protected Attributes inherited from WeightsBase
vector< double >	weightValues
	Weight values and names.
vector< string >	weightNames
Info *	infoPtr {}
	Pointers necessary for variation initialization.

Detailed Description

This is class to collect information on fragmentation weighting, and is in turn part of Info.

Constructor & Destructor Documentation

~WeightsFragmentation

(

)

Destructor.

WeightsFragmentation class.

Fragmentation variations destructor.

Member Function Documentation

void collectWeightNames ( vector< string > &  outputNames )

overridevirtual

Collect fragmentation weight names.

Functions to return processed weights to weight container, e.g. if weights should be combined before proceeding.

Reimplemented from WeightsBase.

vector< double > flavParms	(	double	xi,
		double	rho,
		double	x,
		double	y
	)

Calculate the derived flavour parameters.

Calculate the derived flavor parameters.

Set the primary parameters.

Pass the primary parameters to settings.

Initialize a flavor selector.

Set the derived parameters.

Reset the settings.

double flavWeight	(	const vector< double > &	parms,
		const vector< int > &	breaks
	)

Calculate a flavor weight, given the derived parameters and breaks.

Loop over parameter ratios (avoids floating point exceptions).

Weight unchanged if negative for 5th parameter.

Weight unchanged if no breaks.

Infinite weight if parameter is infinite.

Include remaining weight terms and return.

void init ( )

overridevirtual

Initialize the weights.

Fragmentation variations initialization.

Read weight groups into a dictionary.

Define the ordering of the parameters and key mapping.

Initialize the flavor selector.

Initialize the z selector.

Initialize the pT selector.

Create a map from variation keys to standard keys.

Store the baseline flavor parameters.

Loop over the groups and determine the parameter variations.

Set the parameter variations for a group.

Map the group parameters to factorized parameters.

Transform flavor parameters if needed.

Set the standard parameters.

Check if this is a new factorized variation.

Reimplemented from WeightsBase.

double pTWeight	(	double	sigma,
		double	pT2,
		double	mult
	)

Calculate a pT weight for a single break, given the derived parameters and break info.

double zWeight	(	double	aLund,
		double	bLund,
		double	rFactC,
		double	rFactB,
		int	idOld,
		int	idNew,
		double	mT2,
		double	z,
		double	fPrel
	)

Calculate kinematic weights.

Calculate a z weight for a single break, given the derived parameters and break info.

Positive mT2 is an accepted break.

Initialize all the relevant parameters.

Skip non-standard c, b, or h.

Determine the varied a, b, and c parameters.

Determine position of the maximum. Assuming that no special options are being used, i.e bShape = bLund. This is because b is scaled by mT2.

When b is changed, so is c.

Determine the new position of maximum.

Recalculate the coefficients.

Return the weight.

Member Data Documentation

vector<double> pTBreaks

Track the break information for pT reweighting. This is a flat vector. The double vector is {pT2_0, mult_0, ..., pT2_n, mult_n}.

vector<int> zIntBreaks

Track the break information for z reweighting. These are flat vectors. The integer vector is {idOld_0, idNew_0, ..., idOld_n, idNew_n}. The double vector is {mT2_0, z_0, fPrel}.

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

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