Gabriele Cosmo
123 lines
5.3 KiB
Plaintext
123 lines
5.3 KiB
Plaintext
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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#include <stdlib.h>
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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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}
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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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}
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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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theParticipants.Init(aNucleus.GetN(),aNucleus.GetZ());
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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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G4double nCons = 1;
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if(abs(aProjectile.GetDefinition()->GetBaryonNumber()) !=0)
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{
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nCons = abs(aProjectile.GetDefinition()->GetBaryonNumber());
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}
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G4double pz_per_projectile = aProjectile.Get4Momentum().pz()/nCons;
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// G4double e_per_projectile = aProjectile.Get4Momentum().vect()*aProjectile.Get4Momentum().vect();
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// e_per_projectile /=nCons*nCons;
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// e_per_projectile += G4Proton::Proton()->GetPDGMass()*G4Proton::Proton()->GetPDGMass();
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G4double e_per_projectile = aProjectile.Get4Momentum()*aProjectile.Get4Momentum();
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e_per_projectile += aProjectile.Get4Momentum().vect()*aProjectile.Get4Momentum().vect();
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e_per_projectile /=nCons*nCons;
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e_per_projectile = sqrt(e_per_projectile);
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e_per_projectile += G4Proton::Proton()->GetPDGMass();
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G4double vz = pz_per_projectile/e_per_projectile;
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//--DEBUG-- cout << "IncomingMomentum "<<aProjectile.Get4Momentum()<<G4endl;
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theCurrentVelocity.setZ(vz);
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theParticipants.DoLorentzBoost(-theCurrentVelocity);
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G4LorentzVector Mom = aProjectile.Get4Momentum();
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Mom.boost(-theCurrentVelocity);
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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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//--DEBUG-- cout << "PreInteractionMomentum "<<Mom<<G4endl;
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theParticipants.BuildInteractions(theProjectile);
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theParticipants.GetWoundedNucleus()->DoLorentzBoost(theCurrentVelocity);
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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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// 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())
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{
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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()<<std::endl;
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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()<<std::endl;
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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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//--DEBUG-- cout << G4endl;
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// for(G4int i=0; i<theStrings->size(); i++)
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// {
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// cout << "String = "<<theStrings->operator[](i)->Get4Momentum()<<G4endl;
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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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//*********************************************************************************************************************
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