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//************************************************************************//
// //
// Copyright 2013 Bertram Kopf (bertram@ep1.rub.de) //
// Julian Pychy (julian@ep1.rub.de) //
// - Ruhr-Universität Bochum //
// //
// This file is part of Pawian. //
// //
// Pawian 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. //
// //
// Pawian 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 Pawian. If not, see <http://www.gnu.org/licenses/>. //
// //
//************************************************************************//
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#include "PwaDynamics/Flatte.hh"
#include "Particle/Particle.hh"
#include "qft++/relativistic-quantum-mechanics/Utils.hh"
Flatte::Flatte(std::pair<Particle*, Particle*>& decPair1, std::pair<Particle*, Particle*>& decPair2) :
_mass11(decPair1.first->mass())
,_mass12(decPair1.second->mass())
,_mass21(decPair2.first->mass())
,_mass22(decPair2.second->mass())
{
}
Flatte::Flatte(std::pair <const double, const double>& massPair1, std::pair <const double, const double>& massPair2) :
_mass11(massPair1.first)
,_mass12(massPair1.second)
,_mass21(massPair2.first)
,_mass22(massPair2.second)
{
}
Flatte::~Flatte(){
}
complex<double> Flatte::calcFirstChannel(double currentMass, double mass0, double g1, double g2){
complex<double> i(0.,1.);
//calculate gammas with phase-space factors
complex<double> gamma11=g1*breakupMomQ(currentMass, _mass11, _mass12);
complex<double> gamma22=g2*breakupMomQ(currentMass, _mass21, _mass22);
complex<double> gammaLow(0.,0.);
if( (_mass11+_mass12) < (_mass21+_mass22) ) gammaLow=gamma11;
else gammaLow=gamma22;
complex<double> result=mass0*sqrt(gammaLow*gamma11)/( mass0*mass0 - currentMass*currentMass - i * mass0 * (gamma11+gamma22) );
return result;
}
complex<double> Flatte::calcSecondChannel(double currentMass, double mass0, double g1, double g2){
complex<double> i(0.,1.);
//calculate gammas with phase-space factors
complex<double> gamma11=g1*breakupMomQ(currentMass, _mass11, _mass12);
complex<double> gamma22=g2*breakupMomQ(currentMass, _mass21, _mass22);
complex<double> gammaLow(0.,0.);
if( (_mass11+_mass12) < (_mass21+_mass22) ) gammaLow=gamma11;
else gammaLow=gamma22;
complex<double> result=mass0*sqrt(gammaLow*gamma22)/( mass0*mass0 - currentMass*currentMass - i * mass0 * (gamma11+gamma22) );
return result;
}