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EvtBtoXsgammaFermiUtil.hh
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EvtBtoXsgammaFermiUtil.hh
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//--------------------------------------------------------------------------
//
// Environment:
// This software is part of the EvtGen package developed jointly
// for the BaBar and CLEO collaborations. If you use all or part
// of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
// Copyright (C) 2001 Brunel University
//
// Module: EvtGen/EvtBtoXsgammaFermiUtil.hh
//
// Description:
// Class to hold various fermi functions and their helper functions. The
// fermi functions are used in EvtBtoXsgammaKagan.
//
// Modification history:
//
// Jane Tinslay March 21, 2001 Module created
//
//------------------------------------------------------------------------
#ifndef EVTBTOXSGAMMAFERMIUTIL_HH
#define EVTBTOXSGAMMAFERMIUTIL_HH
#include <vector>
class EvtBtoXsgammaFermiUtil {
//--------------------
// Instance Members --
//--------------------
public:
// Constructors
EvtBtoXsgammaFermiUtil() { };
virtual ~EvtBtoXsgammaFermiUtil() { };
//Exponential function
static double FermiExpFunc(double var, const std::vector<double> &coeffs);
//Gaussian function and its helper functions
static double FermiGaussFunc(double, std::vector<double> const &coeffs);
static double FermiGaussFuncRoot(double, double, double, std::vector<double> &coeffs);
static double FermiGaussRootFcnA(double, const std::vector<double> &coeffs1, const std::vector<double> &coeffs2);
static double FermiGaussRootFcnB(double, const std::vector<double> &coeffs1, const std::vector<double> &coeffs2);
static double Gamma(double, const std::vector<double> &coeffs);
//Roman function and its helper functions
static double BesselI1(double);
static double BesselK1(double);
static double FermiRomanFuncRoot(double, double);
static double FermiRomanRootFcnA(double);
static double FermiRomanFunc(double, std::vector<double> const &coeffs);
};
#endif

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