Geant4  10.00.p02
G4QGSModel.icc
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27 //****************************************************************************************************************
28 template<class ParticipantType>
29 G4QGSModel<ParticipantType>::G4QGSModel()
30  {
31  G4VPartonStringModel::SetThisPointer(this);
32  SetEnergyMomentumCheckLevels(2*CLHEP::perCent, 150*CLHEP::MeV);
33  }
34 template<class ParticipantType>
35 G4QGSModel<ParticipantType>::G4QGSModel(const G4QGSModel &right)
36  {
37  G4VPartonStringModel::SetThisPointer(this);
38  std::pair<G4double, G4double> levels=right.GetEnergyMomentumCheckLevels();
39  SetEnergyMomentumCheckLevels(levels.first, levels.second);
40  }
41 
42 template<class ParticipantType>
43 G4QGSModel<ParticipantType>& G4QGSModel<ParticipantType>::operator=(const G4QGSModel &right)
44  {
45  if (this != &right )
46  {
47  G4VPartonStringModel::SetThisPointer(this);
48  std::pair<G4double, G4double> levels=right.GetEnergyMomentumCheckLevels();
49  SetEnergyMomentumCheckLevels(levels.first, levels.second);
50  }
51  }
52 template<class ParticipantType>
53 G4QGSModel<ParticipantType>::~G4QGSModel()
54  {
55  }
56 
57 template<class ParticipantType>
58 void G4QGSModel<ParticipantType>::Init(const G4Nucleus & aNucleus, const G4DynamicParticle & aProjectile)
59  {
60  // clean-up and consistency with design, HPW Feb 1999
61  theParticipants.Init(aNucleus.GetA_asInt(),aNucleus.GetZ_asInt());
62  theCurrentVelocity.setX(0);
63  theCurrentVelocity.setY(0);
64  // HPW Feb 1999
65  // this is an approximation, neglecting the motion of nucleons in the nucleus & p,n mass differences. @@@
66 // G4double vz_old = aProjectile.Get4Momentum().pz()/
67 // (aProjectile.Get4Momentum().e() + G4Proton::Proton()->GetPDGMass());
68  G4double nCons = 1;
69  if(std::abs(aProjectile.GetDefinition()->GetBaryonNumber()) !=0)
70  {
71  nCons = std::abs(aProjectile.GetDefinition()->GetBaryonNumber());
72  }
73  G4double pz_per_projectile = aProjectile.Get4Momentum().pz()/nCons;
74 // G4double e_per_projectile = aProjectile.Get4Momentum().vect()*aProjectile.Get4Momentum().vect();
75 // e_per_projectile /=nCons*nCons;
76 // e_per_projectile += G4Proton::Proton()->GetPDGMass()*G4Proton::Proton()->GetPDGMass();
77  G4double e_per_projectile = aProjectile.Get4Momentum()*aProjectile.Get4Momentum();
78  e_per_projectile += aProjectile.Get4Momentum().vect()*aProjectile.Get4Momentum().vect();
79  e_per_projectile /=nCons*nCons;
80  e_per_projectile = std::sqrt(e_per_projectile);
81  e_per_projectile += G4Proton::Proton()->GetPDGMass();
82  G4double vz = pz_per_projectile/e_per_projectile;
83 //--DEBUG-- G4cout << "IncomingMomentum - vz "<<aProjectile.Get4Momentum()<< ", " << vz <<G4endl;
84  theCurrentVelocity.setZ(vz);
85  theParticipants.DoLorentzBoost(-theCurrentVelocity);
86  G4LorentzVector Mom = aProjectile.Get4Momentum();
87  Mom.boost(-theCurrentVelocity);
88  G4ReactionProduct theProjectile;
89  theProjectile.SetDefinition(aProjectile.GetDefinition());
90  theProjectile.SetTotalEnergy(Mom.e());
91  theProjectile.SetMomentum(Mom.vect());
92 //--DEBUG-- G4cout << "PreInteractionMomentum "<<Mom<<G4endl;
93  theParticipants.BuildInteractions(theProjectile);
94  theParticipants.GetWoundedNucleus()->DoLorentzBoost(theCurrentVelocity);
95  }
96 
97 template<class ParticipantType>
98 G4ExcitedStringVector * G4QGSModel<ParticipantType>::GetStrings()
99 {
100  // clean-up and consistancy with design, HPW Feb 1999
101  // also fixing a memory leak, removing unnecessary caching, and
102  // streamlining of logic
103  G4PartonPair* aPair;
104  G4ExcitedStringVector* theStrings = new G4ExcitedStringVector;
105  G4ExcitedString * aString;
106  while( (aPair = theParticipants.GetNextPartonPair()) )
107  {
108  if (aPair->GetCollisionType() == G4PartonPair::DIFFRACTIVE)
109  {
110  aString = theDiffractiveStringBuilder.BuildString(aPair);
111  // G4cout << "diffractive "<<aString->Get4Momentum()<<G4endl;
112  }
113  else
114  {
115  aString = theSoftStringBuilder.BuildString(aPair);
116  // G4cout << "soft "<<aString->Get4Momentum()<<G4endl;
117  }
118 //--DEBUG-- G4cout << " QGSModel.icc::GetStrings() theCurrentVelocity " << theCurrentVelocity << G4endl;
119  aString->Boost(theCurrentVelocity);
120  theStrings->push_back(aString);
121  delete aPair;
122  }
123 //--DEBUG-- G4cout << G4endl;
124 // for(G4int i=0; i<theStrings->size(); i++)
125 // {
126 // G4cout << "String = "<<theStrings->operator[](i)->Get4Momentum()<<G4endl;
127 // }
128  return theStrings;
129 }
130 
131 template<class ParticipantType>
132 G4V3DNucleus* G4QGSModel<ParticipantType>::GetWoundedNucleus() const
133 {
134  return theParticipants.GetWoundedNucleus();
135 }
136 
137 template<class ParticipantType> // Uzhi Nov. 2012
138 G4V3DNucleus* G4QGSModel<ParticipantType>::GetProjectileNucleus() const
139 {
140  return 0;
141 }
142 
143 template<class ParticipantType>
144 void G4QGSModel<ParticipantType>::ModelDescription(std::ostream& outFile) const
145 {
146  outFile << "The Quark-Gluon String (QGS) model simulates the interaction\n"
147  << "of protons, neutrons, pions and kaons with nuclei in the\n"
148  << "approximate energy range 20 GeV to 50 TeV. The model handles\n"
149  << "the selection of collision partners, splitting of the nucleons\n"
150  << "into quarks and di-quarks, the formation and excitation of\n"
151  << "quark-gluon strings, string hadronization and diffractive dissociation.\n";
152 }
153 //*********************************************************************************************************************
154