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25 //
26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35
36 #include "globals.hh"
37
38 #include "G4INCLNpiToLK2piChannel.hh"
39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh"
44 #include <algorithm>
45 #include "G4INCLPhaseSpaceGenerator.hh"
46
47 namespace G4INCL {
48
49 const G4double NpiToLK2piChannel::angularSlope = 6.; // What is the exact effect? Sould be check
50
51 NpiToLK2piChannel::NpiToLK2piChannel(Particle *p1, Particle *p2)
52 : particle1(p1), particle2(p2)
53 {}
54
55 NpiToLK2piChannel::~NpiToLK2piChannel(){}
56
57 void NpiToLK2piChannel::fillFinalState(FinalState *fs) {
58
59 // p pi+ -> L K+ pi+ pi0 (1)
60 // p pi+ -> L K0 pi+ pi+ (1)
61 //
62 // p pi0 -> L K+ pi0 pi0 (1/4)
63 // p pi0 -> L K+ pi+ pi- (1)
64 // p pi0 -> L K0 pi+ pi0 (1/2)
65 //
66 // p pi- -> L K+ pi0 pi- (1)
67 // p pi- -> L K0 pi+ pi- (1)
68 // p pi- -> L K0 pi0 pi0 (1/2)
69
70 Particle *nucleon;
71 Particle *pion;
72
73 if(particle1->isNucleon()){
74 nucleon = particle1;
75 pion = particle2;
76 }
77 else{
78 nucleon = particle2;
79 pion = particle1;
80 }
81
82 const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, pion);
83
84 const G4int iso = ParticleTable::getIsospin(nucleon->getType()) + ParticleTable::getIsospin(pion->getType());
85 G4double rdm = Random::shoot();
86
87 ParticleType KaonType;
88 ParticleType PionType;
89
90 if(iso == 3 || iso == -3){
91 if(rdm < 0.5){
92 KaonType = ParticleTable::getKaonType(iso/3);
93 PionType = PiZero;
94 }
95 else{
96 KaonType = ParticleTable::getKaonType(-iso/3);
97 PionType = ParticleTable::getPionType(2*iso/3);
98 }
99 }
100 else if(pion->getType() == PiZero){
101 if(rdm*7. < 1.){
102 KaonType = ParticleTable::getKaonType(iso);
103 PionType = PiZero;
104 }
105 else if(rdm*7. < 5.){
106 KaonType = ParticleTable::getKaonType(iso);
107 pion->setType(PiPlus);
108 PionType = PiMinus;
109 }
110 else{
111 KaonType = ParticleTable::getKaonType(-iso);
112 PionType = ParticleTable::getPionType(2*iso);
113 }
114 }
115 else{
116 if(rdm*5. < 2.){
117 KaonType = ParticleTable::getKaonType(-iso);
118 PionType = PiZero;
119 }
120 else if(rdm*5. < 4.){
121 KaonType = ParticleTable::getKaonType(iso);
122 PionType = ParticleTable::getPionType(-2*iso);;
123 }
124 else{
125 KaonType = ParticleTable::getKaonType(iso);
126 pion->setType(PiZero);
127 PionType = PiZero;
128 }
129 }
130
131 nucleon->setType(Lambda);
132
133 #ifdef INCLXX_IN_GEANT4_MODE
134 // Erase the parent resonance information of the nucleon and pion
135 nucleon->setParentResonancePDGCode(0);
136 nucleon->setParentResonanceID(0);
137 pion->setParentResonancePDGCode(0);
138 pion->setParentResonanceID(0);
139 #endif
140
141 ParticleList list;
142 list.push_back(nucleon);
143 list.push_back(pion);
144 const ThreeVector &rcol1 = nucleon->getPosition();
145 const ThreeVector &rcol2 = pion->getPosition();
146 const ThreeVector zero;
147 Particle *kaon = new Particle(KaonType,zero,rcol1);
148 Particle *pion2 = new Particle(PionType,zero,rcol2);
149 list.push_back(kaon);
150 list.push_back(pion2);
151
152 PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
153
154 INCL_DEBUG("NpiToLK2pi " << (kaon->getMomentum().theta()) * 180. / G4INCL::Math::pi << '\n');
155
156 fs->addModifiedParticle(nucleon);
157 fs->addModifiedParticle(pion);
158 fs->addCreatedParticle(kaon);
159 fs->addCreatedParticle(pion2);
160
161 }
162 }
163