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EvtPhotosEngine.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/>. *
***********************************************************************/
#ifdef EVTGEN_PHOTOS
#ifndef EVTPHOTOSENGINE_HH
#define EVTPHOTOSENGINE_HH
#include "EvtGenBase/EvtHepMCEvent.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenModels/EvtAbsExternalGen.hh"
#ifdef EVTGEN_HEPMC3
#include "HepMC3/Units.h"
#include "Photos/PhotosHepMC3Event.h"
#include "Photos/PhotosHepMC3Particle.h"
#else
#include "Photos/PhotosHepMCEvent.h"
#include "Photos/PhotosHepMCParticle.h"
#include "Photos/PhotosParticle.h"
#endif
#include <string>
// Description: Interface to the PHOTOS external generator
class EvtPhotosEngine : public EvtAbsExternalGen {
public:
EvtPhotosEngine( std::string photonType = "gamma",
bool useEvtGenRandom = true );
bool doDecay( EvtParticle* theMother ) override;
void initialise() override;
private:
std::string _photonType;
EvtId _gammaId;
int _gammaPDG;
double _mPhoton;
bool _initialised;
GenParticlePtr createGenParticle( EvtParticle* theParticle, bool incoming );
int getNumberOfPhotons( const GenVertexPtr theVertex ) const;
};
#endif
#endif

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