Gabriele Cosmo
156 lines
6.8 KiB
Plaintext
156 lines
6.8 KiB
Plaintext
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//****************************************************************************************************************
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template<class ParticipantType>
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G4QGSModel<ParticipantType>::G4QGSModel()
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{
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G4VPartonStringModel::SetThisPointer(this);
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SetEnergyMomentumCheckLevels(2*CLHEP::perCent, 150*CLHEP::MeV);
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}
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template<class ParticipantType>
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G4QGSModel<ParticipantType>::G4QGSModel(const G4QGSModel &right)
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{
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G4VPartonStringModel::SetThisPointer(this);
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std::pair<G4double, G4double> levels=right.GetEnergyMomentumCheckLevels();
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SetEnergyMomentumCheckLevels(levels.first, levels.second);
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}
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template<class ParticipantType>
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G4QGSModel<ParticipantType>& G4QGSModel<ParticipantType>::operator=(const G4QGSModel &right)
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{
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if (this != &right )
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{
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G4VPartonStringModel::SetThisPointer(this);
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std::pair<G4double, G4double> levels=right.GetEnergyMomentumCheckLevels();
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SetEnergyMomentumCheckLevels(levels.first, levels.second);
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}
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}
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template<class ParticipantType>
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G4QGSModel<ParticipantType>::~G4QGSModel()
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{
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}
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template<class ParticipantType>
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void G4QGSModel<ParticipantType>::Init(const G4Nucleus & aNucleus, const G4DynamicParticle & aProjectile)
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{
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// clean-up and consistency with design, HPW Feb 1999
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/*
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G4cout<<"QGSM Init A Z "<<aNucleus.GetA_asInt()<<" "<<aNucleus.GetZ_asInt()<<G4endl;
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G4cout<<"Projectile "<<aProjectile.GetDefinition()->GetParticleName()<<" "<<aProjectile.GetDefinition()->GetBaryonNumber()<<G4endl;
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G4cout<<" "<<aProjectile.Get4Momentum()<<G4endl;
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*/
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theParticipants.Init(aNucleus.GetA_asInt(),aNucleus.GetZ_asInt());
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theCurrentVelocity.setX(0);
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theCurrentVelocity.setY(0);
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// HPW Feb 1999
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// this is an approximation, neglecting the motion of nucleons in the nucleus & p,n mass differences. @@@
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// G4double vz_old = aProjectile.Get4Momentum().pz()/
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// (aProjectile.Get4Momentum().e() + G4Proton::Proton()->GetPDGMass());
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/* //Uzhi 15.05.2015
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G4double nCons = 1;
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if(std::abs(aProjectile.GetDefinition()->GetBaryonNumber()) !=0)
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{
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nCons = std::abs(aProjectile.GetDefinition()->GetBaryonNumber());
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}
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*/
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// Transformation to hN/NN CMS system ---------------------------------
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//Uzhi 15.05.2015 G4double pz_per_projectile = aProjectile.Get4Momentum().pz()/nCons;
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//Uzhi 15.05.2015 G4double EperHN=aProjectile.Get4Momentum().e()/nCons + G4Proton::Proton()->GetPDGMass();
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G4double vz = 0.; //pz_per_projectile/EperHN;
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theCurrentVelocity.setZ(vz);
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theParticipants.DoLorentzBoost(-theCurrentVelocity); // Lorentz boost of the target nucleus
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G4LorentzVector Mom = aProjectile.Get4Momentum();
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Mom.boost(-theCurrentVelocity); // Lorentz boost of the projectile
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// End of the transformation ------------------------------------------
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G4ReactionProduct theProjectile;
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theProjectile.SetDefinition(aProjectile.GetDefinition());
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theProjectile.SetTotalEnergy(Mom.e());
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theProjectile.SetMomentum(Mom.vect());
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theParticipants.BuildInteractions(theProjectile);
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theParticipants.GetWoundedNucleus()->DoLorentzBoost(theCurrentVelocity); // Backward transformation
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}
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template<class ParticipantType>
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G4ExcitedStringVector * G4QGSModel<ParticipantType>::GetStrings()
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{
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//G4cout<<"G4ExcitedStringVector * G4QGSModel<ParticipantType>::GetStrings()"<<G4endl;
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// clean-up and consistancy with design, HPW Feb 1999
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// also fixing a memory leak, removing unnecessary caching, and
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// streamlining of logic
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G4PartonPair* aPair;
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G4ExcitedStringVector* theStrings = new G4ExcitedStringVector;
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G4ExcitedString * aString;
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while( (aPair = theParticipants.GetNextPartonPair()) ) /* Loop checking, 07.08.2015, A.Ribon */
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{
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//G4cout<<"aPair->GetCollisionType() "<<aPair->GetCollisionType()<<G4endl;
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if (aPair->GetCollisionType() == G4PartonPair::DIFFRACTIVE)
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{
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aString = theDiffractiveStringBuilder.BuildString(aPair);
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//G4cout << "diffractive "<<aString->Get4Momentum()<<G4endl;
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}
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else
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{
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aString = theSoftStringBuilder.BuildString(aPair);
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//G4cout << "soft "<<aString->Get4Momentum()<<G4endl;
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}
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aString->Boost(theCurrentVelocity);
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theStrings->push_back(aString);
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delete aPair;
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}
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return theStrings;
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}
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template<class ParticipantType>
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G4V3DNucleus* G4QGSModel<ParticipantType>::GetWoundedNucleus() const
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{
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return theParticipants.GetWoundedNucleus();
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}
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template<class ParticipantType> // Uzhi Nov. 2012
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G4V3DNucleus* G4QGSModel<ParticipantType>::GetProjectileNucleus() const
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{
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return 0;
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}
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template<class ParticipantType>
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void G4QGSModel<ParticipantType>::ModelDescription(std::ostream& outFile) const
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{
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outFile << "The Quark-Gluon String (QGS) model simulates the interaction\n"
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<< "of protons, neutrons, pions and kaons with nuclei in the\n"
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<< "approximate energy range 20 GeV to 50 TeV. The model handles\n"
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<< "the selection of collision partners, splitting of the nucleons\n"
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<< "into quarks and di-quarks, the formation and excitation of\n"
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<< "quark-gluon strings, string hadronization and diffractive dissociation.\n";
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}
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//*********************************************************************************************************************
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