This class offers a simple parameterisation of a resolution. More...

#include <ResCrystalBallBase.h>

Inheritance diagram for KLFitter::ResCrystalBallBase:

Public Member Functions
	ResCrystalBallBase (const char *filename)
	The default constructor.

	ResCrystalBallBase (std::vector< double > const &parameters)
	A constructor that takes parameters directly, unlike the default constructor that takes a path to the file with TFs. More...

virtual	~ResCrystalBallBase ()
	The (defaulted) destructor.

virtual double	GetAlpha (double x)=0
	Calculate the alpha parameter from the TF parameters and the value of x. More...

virtual double	GetN (double x)=0
	Calculate the n parameter from the TF parameters and the value of x. More...

virtual double	GetMean (double x)=0
	Calculate the mean from the TF parameters and the value of x. More...

double	logp (double x, double xmeas, bool *good, double=0) override
	Return the probability of the true value of x given the measured value, xmeas. More...

double	LogCrystalBallFunction (double x, double alpha, double n, double sigma, double mean)
	A function that calculates CrystalBall See twiki: https://en.wikipedia.org/wiki/Crystal_Ball_function. More...

double	ApproxError (double x)
	An approximation of the error function needed to calculate crystal ball normalization with precision < 1e-4. More...

Public Member Functions inherited from KLFitter::ResolutionBase
	ResolutionBase (int npar)
	The default constructor. More...

	ResolutionBase (std::vector< double > parameters)
	A constructor. More...

virtual	~ResolutionBase ()
	The (defaulted) destructor.

virtual double	GetSigma (double par)=0
	Return the (approximate) width of the TF depending on the relevant parameter (mostly xmeas, but sumET in case of ResGauss_MET). More...

int	Par (int index, double *par)
	Return a parameter of the parameterization. More...

int	SetPar (int index, double value)
	Set a parameter value. More...

int	SetPar (std::vector< double > parameters)
	Set all parameter values. More...

int	ReadParameters (const char *filename, std::size_t nparameters)
	Read parameter values from ASCII file. More...

int	Status ()
	Return a status code. More...

Static Public Member Functions
static bool	CheckCrystalBallSanity (double sigma, double n)
	Sanity check for the crystal ball parameters sigma, and n (1st sigma, scale and 2nd sigma). More...

Additional Inherited Members
Protected Attributes inherited from KLFitter::ResolutionBase
int	fNParameters
	The number of parameters.

std::vector< double >	fParameters
	The parameter values.

int	fStatus
	The status of this class (1: ok, 0: error).

Detailed Description

This class offers a simple parameterisation of a resolution.

The parametrisation is a CrystalBall function with energy dependent parameters.

Constructor & Destructor Documentation

KLFitter::ResCrystalBallBase::ResCrystalBallBase ( std::vector< double > const & parameters )

explicit

A constructor that takes parameters directly, unlike the default constructor that takes a path to the file with TFs.

Parameters

parameters The parameters of the parameterization.

Member Function Documentation

double KLFitter::ResCrystalBallBase::ApproxError ( double x )

An approximation of the error function needed to calculate crystal ball normalization with precision < 1e-4.

Decreases computation time by about 10%.

Parameters

x

Returns: Approximate value of the error function for x

static bool KLFitter::ResCrystalBallBase::CheckCrystalBallSanity	(	double *	sigma,
		double *	n
	)

inlinestatic

Sanity check for the crystal ball parameters sigma, and n (1st sigma, scale and 2nd sigma).

Parameters

sigma.
n.

Returns: False if problem with TF.

virtual double KLFitter::ResCrystalBallBase::GetAlpha ( double x )

pure virtual

Calculate the alpha parameter from the TF parameters and the value of x.

Parameters

x	The value of x.

Returns: The alpha.

Implemented in KLFitter::ResCrystalBallJets.

virtual double KLFitter::ResCrystalBallBase::GetMean ( double x )

pure virtual

Calculate the mean from the TF parameters and the value of x.

Parameters

x	The value of x.

Returns: The mean.

Implemented in KLFitter::ResCrystalBallJets.

virtual double KLFitter::ResCrystalBallBase::GetN ( double x )

pure virtual

Calculate the n parameter from the TF parameters and the value of x.

Parameters

x	The value of x.

Returns: The parameter n.

Implemented in KLFitter::ResCrystalBallJets.

double KLFitter::ResCrystalBallBase::LogCrystalBallFunction	(	double	x,
		double	alpha,
		double	n,
		double	sigma,
		double	mean
	)

A function that calculates CrystalBall See twiki: https://en.wikipedia.org/wiki/Crystal_Ball_function.

Parameters

x
Alpha	parameter
n	parameter
sigma	parameter
mean	parameter

Returns: Logarithm of CrystalBall value for X

double KLFitter::ResCrystalBallBase::logp	(	double	x,
		double	xmeas,
		bool *	good,
		double	= `0`
	)

overridevirtual

Return the probability of the true value of x given the measured value, xmeas.

Parameters

x	The true value of x.
xmeas	The measured value of x.
good	False if problem with TF.
par	Optional additional parameter (not used here).

Returns: Logarithm of the probability.

Reimplemented from KLFitter::ResolutionBase.

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

include/KLFitter/ResCrystalBallBase.h
src/ResCrystalBallBase.cxx

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation