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EvtMBreitWigner.cpp
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EvtMBreitWigner.cpp
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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/>. *
***********************************************************************/
#include "EvtGenBase/EvtMBreitWigner.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include <stdlib.h>
using std::endl;
EvtMBreitWigner::EvtMBreitWigner( const EvtId& id, const vector<string>& args )
{
if ( args.size() != 0 ) {
EvtGenReport( EVTGEN_ERROR, "EvtGen" )
<< "Unknown input arguments passed in to lineshape." << endl;
::abort();
}
_id = id;
_width = EvtPDL::getWidth( id );
_resmass = EvtPDL::getMeanMass( id );
}
EvtComplex EvtMBreitWigner::shape( const vector<EvtVector4R>& product ) const
{
static EvtComplex I( 0.0, 1.0 );
double mass = _node->get4vector( product ).mass();
return sqrt( _width / ( EvtConst::twoPi ) ) * 1 /
( mass - _resmass - I * _width / 2 );
}
EvtMLineShape* EvtMBreitWigner::duplicate() const
{
vector<string> args;
EvtMLineShape* tmp = new EvtMBreitWigner( _id, args );
return tmp;
}

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