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EvtLambdaP_BarGamma.hh
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#ifndef EVTLAMBDAPBARGAMMA_HH
#define EVTLAMBDAPBARGAMMA_HH
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtConst.hh"
#include "EvtGenBase/EvtDecayAmp.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtParticle.hh"
// Description:Implementation of the decay B- -> lambda p_bar gamma according to
// Cheng, Yang; hep-ph/0201015
class EvtLambdaP_BarGamma : public EvtDecayAmp {
public:
EvtLambdaP_BarGamma();
~EvtLambdaP_BarGamma() { ; }
std::string getName() override;
EvtDecayBase* clone() override;
void decay( EvtParticle* p ) override;
void init() override;
void initProbMax() override;
private:
// some constants to make the code easier to read and maintain
// these three should be constants... (implementation of getMass() prohibits this)
double _mLambdab; // = 5.624; // Lambda_b mass
double _mLambda0; // = 1.115684; // Lambda0 mass
double _c7Eff; // = -0.31; // Wilson coefficient
double _mb; // = 4.4; // running b mass
double _mV; // = 5.42; // pole mass vector current
double _mA; // = 5.86; // pole mass axial current
double _GF; // = 1.166E-5; // Fermi constant
double _gLambdab; // = 16; // coupling constant Lambda_b -> B- p
double _e0; // = 1; // electromagnetic coupling (+1)
double _g1; // = 0.64; // heavy-light form factors at q_mSqare
double _g2; // = -0.10;
double _f1; // = 0.64;
double _f2; // = -0.31;
double _VtbVtsStar; // = 0.038; // |V_tb V_ts^*|
// user never needs to call this -> private
// baryonic form factors f(p), g(p), at p=0
double f0( const double f_qm,
int n = 1 ) const; // calculate f(0) with f(q_max)
double g0( const double f_qm,
int n = 1 ) const; // calculate g(0) with g(q_max)
// shorthand for constants a and b in the formula
double constA() const;
double constB() const;
// initialize phasespace and calculate the amplitude for one (i=0,1) state of the photon
EvtComplex calcAmpliude( const EvtParticle* p, const unsigned int polState );
};
#endif

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