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EvtPythiaEngine.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_PYTHIA
#ifndef EVTPYTHIAENGINE_HH
#define EVTPYTHIAENGINE_HH
#include "EvtGenBase/EvtDecayBase.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtVector4R.hh"
#include "EvtGenModels/EvtAbsExternalGen.hh"
#include "EvtGenExternal/EvtPythiaRandom.hh"
#include "Pythia8/ParticleData.h"
#include "Pythia8/Pythia.h"
#include <map>
#include <memory>
#include <string>
#include <vector>
// Description: Interface to the Pytha 8 external generator
class EvtPythiaEngine : public EvtAbsExternalGen {
public:
EvtPythiaEngine( std::string xmlDir = "./xmldoc",
bool convertPhysCodes = false, bool useEvtGenRandom = true );
bool doDecay( EvtParticle* theMother ) override;
void initialise() override;
protected:
private:
void updateParticleLists();
void updatePhysicsParameters();
bool validPDGCode( int PDGCode );
void createPythiaParticle( Pythia8::Pythia& thePythiaGenerator,
EvtId& particleId, int PDGCode );
void updatePythiaDecayTable( Pythia8::Pythia& thePythiaGenerator,
EvtId& particleId, int aliasInt, int PDGCode );
void storeDaughterInfo( Pythia8::Event& theEvent, EvtParticle* theParticle,
int startInt );
void clearDaughterVectors();
void clearPythiaModeMap();
void createDaughterEvtParticles( EvtParticle* theParent );
int getModeInt( EvtDecayBase* decayModel );
bool m_convertPhysCodes;
// Specify if we are going to use the random number generator (engine) from EvtGen for Pythia 8.
bool m_useEvtGenRandom;
bool m_initialised{ false };
std::unique_ptr<Pythia8::Pythia> m_genericPythiaGen;
std::unique_ptr<Pythia8::Pythia> m_aliasPythiaGen;
std::shared_ptr<EvtPythiaRandom> m_evtgenRandom;
std::vector<int> m_daugPDGVector;
std::vector<EvtVector4R> m_daugP4Vector;
std::map<int, std::vector<int>> m_pythiaModeMap;
std::map<int, int> m_addedPDGCodes;
};
#endif
#endif

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