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25 // 25 //
26 // INCL++ intra-nuclear cascade model 26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France 27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium 28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France 29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and H 30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France 31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France 32 // Davide Mancusi, CEA-Saclay, France
33 // 33 //
34 #define INCLXX_IN_GEANT4_MODE 1 34 #define INCLXX_IN_GEANT4_MODE 1
35 35
36 #include "globals.hh" 36 #include "globals.hh"
37 37
38 #include "G4INCLNDeltaToDeltaLKChannel.hh" 38 #include "G4INCLNDeltaToDeltaLKChannel.hh"
39 #include "G4INCLKinematicsUtils.hh" 39 #include "G4INCLKinematicsUtils.hh"
40 #include "G4INCLBinaryCollisionAvatar.hh" 40 #include "G4INCLBinaryCollisionAvatar.hh"
41 #include "G4INCLRandom.hh" 41 #include "G4INCLRandom.hh"
42 #include "G4INCLGlobals.hh" 42 #include "G4INCLGlobals.hh"
43 #include "G4INCLLogger.hh" 43 #include "G4INCLLogger.hh"
44 #include <algorithm> 44 #include <algorithm>
45 #include "G4INCLPhaseSpaceGenerator.hh" 45 #include "G4INCLPhaseSpaceGenerator.hh"
46 46
47 namespace G4INCL { 47 namespace G4INCL {
48 48
49 const G4double NDeltaToDeltaLKChannel::angul 49 const G4double NDeltaToDeltaLKChannel::angularSlope = 2.;
50 50
51 NDeltaToDeltaLKChannel::NDeltaToDeltaLKChann 51 NDeltaToDeltaLKChannel::NDeltaToDeltaLKChannel(Particle *p1, Particle *p2)
52 : particle1(p1), particle2(p2) 52 : particle1(p1), particle2(p2)
53 {} 53 {}
54 54
55 NDeltaToDeltaLKChannel::~NDeltaToDeltaLKChan 55 NDeltaToDeltaLKChannel::~NDeltaToDeltaLKChannel(){}
56 56
57 G4double NDeltaToDeltaLKChannel::sampleDelta 57 G4double NDeltaToDeltaLKChannel::sampleDeltaMass(G4double ecm) {
58 const G4double maxDeltaMass = ecm - Partic 58 const G4double maxDeltaMass = ecm - ParticleTable::effectiveLambdaMass - ParticleTable::effectiveKaonMass - 1.0;
59 const G4double maxDeltaMassRndm = std::ata 59 const G4double maxDeltaMassRndm = std::atan((maxDeltaMass-ParticleTable::effectiveDeltaMass)*2./ParticleTable::effectiveDeltaWidth);
60 const G4double deltaMassRndmRange = maxDel 60 const G4double deltaMassRndmRange = maxDeltaMassRndm - ParticleTable::minDeltaMassRndm;
61 // assert(deltaMassRndmRange>0.); 61 // assert(deltaMassRndmRange>0.);
62 62
63 G4double y=ecm*ecm; 63 G4double y=ecm*ecm;
64 G4double q2=(y-1.157776E6)*(y-6.4E5)/y/4.0 64 G4double q2=(y-1.157776E6)*(y-6.4E5)/y/4.0; // 1.157776E6 = 1076^2 = (mNucleon + mPion)^2, 6.4E5 = 800^2 = (mNucleon - mPion)^2
65 G4double q3=std::pow(std::sqrt(q2), 3.); 65 G4double q3=std::pow(std::sqrt(q2), 3.);
66 const G4double f3max=q3/(q3+5.832E6); // 5 66 const G4double f3max=q3/(q3+5.832E6); // 5.832E6 = 180^3 = ???^3
67 G4double x; 67 G4double x;
68 68
69 G4int nTries = 0; 69 G4int nTries = 0;
70 G4bool success = false; 70 G4bool success = false;
71 while(!success) { /* Loop checking, 10.07. 71 while(!success) { /* Loop checking, 10.07.2015, D.Mancusi */
72 if(++nTries >= 100000) { 72 if(++nTries >= 100000) {
73 INCL_WARN("NDeltaToDeltaLKChannel::sam 73 INCL_WARN("NDeltaToDeltaLKChannel::sampleDeltaMass loop was stopped because maximum number of tries was reached. Minimum delta mass "
74 << ParticleTable::minDeltaMass < 74 << ParticleTable::minDeltaMass << " MeV with CM energy " << ecm << " MeV may be unphysical." << '\n');
75 return ParticleTable::minDeltaMass; 75 return ParticleTable::minDeltaMass;
76 } 76 }
77 77
78 G4double rndm = ParticleTable::minDeltaM 78 G4double rndm = ParticleTable::minDeltaMassRndm + Random::shoot() * deltaMassRndmRange;
79 y = std::tan(rndm); 79 y = std::tan(rndm);
80 x = ParticleTable::effectiveDeltaMass + 80 x = ParticleTable::effectiveDeltaMass + 0.5*ParticleTable::effectiveDeltaWidth*y;
81 // assert(x>=ParticleTable::minDeltaMass && ec 81 // assert(x>=ParticleTable::minDeltaMass && ecm >= x + ParticleTable::effectiveLambdaMass + ParticleTable::effectiveKaonMass + 1.0);
82 82
83 // generation of the delta mass with the 83 // generation of the delta mass with the penetration factor
84 // (see prc56(1997)2431) 84 // (see prc56(1997)2431)
85 y=x*x; 85 y=x*x;
86 q2=(y-1.157776E6)*(y-6.4E5)/y/4.0; // 1. 86 q2=(y-1.157776E6)*(y-6.4E5)/y/4.0; // 1.157776E6 = 1076^2 = (mNucleon + mPion)^2, 6.4E5 = 800^2 = (mNucleon - mPion)^2
87 q3=std::pow(std::sqrt(q2), 3.); 87 q3=std::pow(std::sqrt(q2), 3.);
88 const G4double f3=q3/(q3+5.832E6); // 5. 88 const G4double f3=q3/(q3+5.832E6); // 5.832E6 = 180^3 = ???^3
89 rndm = Random::shoot(); 89 rndm = Random::shoot();
90 if (rndm*f3max < f3) 90 if (rndm*f3max < f3)
91 success = true; 91 success = true;
92 } 92 }
93 return x; 93 return x;
94 } 94 }
95 95
96 void NDeltaToDeltaLKChannel::fillFinalState( 96 void NDeltaToDeltaLKChannel::fillFinalState(FinalState *fs) {
97 // D++ p -> L K+ D++ (4) 97 // D++ p -> L K+ D++ (4)
98 // 98 //
99 // D++ n -> L K+ D+ (3) 99 // D++ n -> L K+ D+ (3)
100 // D++ n -> L K0 D++ (4) 100 // D++ n -> L K0 D++ (4)
101 // 101 //
102 // D+ p -> L K0 D++ (3) 102 // D+ p -> L K0 D++ (3)
103 // D+ p -> L K+ D+ (2) 103 // D+ p -> L K+ D+ (2)
104 // 104 //
105 // D+ n -> L K+ D0 (4) 105 // D+ n -> L K+ D0 (4)
106 // D+ n -> L K0 D+ (2) 106 // D+ n -> L K0 D+ (2)
107 107
108 Particle *delta; 108 Particle *delta;
109 Particle *nucleon; 109 Particle *nucleon;
110 110
111 if (particle1->isResonance()) { 111 if (particle1->isResonance()) {
112 delta = particle1; 112 delta = particle1;
113 nucleon = particle2; 113 nucleon = particle2;
114 } 114 }
115 else { 115 else {
116 delta = particle2; 116 delta = particle2;
117 nucleon = particle1; 117 nucleon = particle1;
118 } 118 }
119 119
120 120
121 const G4double sqrtS = KinematicsUtils::to 121 const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2);
122 122
123 const G4int iso = ParticleTable::getIsospi 123 const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
124 const G4int iso_d = ParticleTable::getIsos 124 const G4int iso_d = ParticleTable::getIsospin(delta->getType());
125 const G4double rdm = Random::shoot(); 125 const G4double rdm = Random::shoot();
126 126
127 /* const G4double m1 = particle1->getMass() 127 /* const G4double m1 = particle1->getMass();
128 const G4double m2 = particle2->getMass(); 128 const G4double m2 = particle2->getMass();
129 const G4double pLab = KinematicsUtils::mom 129 const G4double pLab = KinematicsUtils::momentumInLab(particle1, particle2);*/
130 130
131 ParticleType KaonType; 131 ParticleType KaonType;
132 ParticleType DeltaType; 132 ParticleType DeltaType;
133 nucleon->setType(Lambda); 133 nucleon->setType(Lambda);
134 134
135 if(std::abs(iso) == 4){// D++ p 135 if(std::abs(iso) == 4){// D++ p
136 KaonType = ParticleTable::getKaonType(is 136 KaonType = ParticleTable::getKaonType(iso/4);
137 DeltaType = ParticleTable::getDeltaType( 137 DeltaType = ParticleTable::getDeltaType(3*iso/4);
138 } 138 }
139 else if(iso == 0){// D+ n 139 else if(iso == 0){// D+ n
140 if(rdm*3 < 2){ 140 if(rdm*3 < 2){
141 KaonType = ParticleTable::getKaonType( 141 KaonType = ParticleTable::getKaonType(iso_d);
142 DeltaType = ParticleTable::getDeltaTyp 142 DeltaType = ParticleTable::getDeltaType(-iso_d);
143 } 143 }
144 else{ 144 else{
145 KaonType = ParticleTable::getKaonType( 145 KaonType = ParticleTable::getKaonType(-iso_d);
146 DeltaType = ParticleTable::getDeltaTyp 146 DeltaType = ParticleTable::getDeltaType(iso_d);
147 } 147 }
148 } 148 }
149 else if(ParticleTable::getIsospin(particle 149 else if(ParticleTable::getIsospin(particle1->getType()) == ParticleTable::getIsospin(particle2->getType())){// D+ p
150 if(rdm*5 < 3){ 150 if(rdm*5 < 3){
151 KaonType = ParticleTable::getKaonType( 151 KaonType = ParticleTable::getKaonType(-iso/2);
152 DeltaType = ParticleTable::getDeltaTyp 152 DeltaType = ParticleTable::getDeltaType(3*iso/2);
153 } 153 }
154 else{ 154 else{
155 KaonType = ParticleTable::getKaonType( 155 KaonType = ParticleTable::getKaonType(iso/2);
156 DeltaType = ParticleTable::getDeltaTyp 156 DeltaType = ParticleTable::getDeltaType(iso/2);
157 } 157 }
158 } 158 }
159 else{// D++ n 159 else{// D++ n
160 if(rdm*7 < 3){ 160 if(rdm*7 < 3){
161 KaonType = ParticleTable::getKaonType( 161 KaonType = ParticleTable::getKaonType(iso/2);
162 DeltaType = ParticleTable::getDeltaTyp 162 DeltaType = ParticleTable::getDeltaType(iso/2);
163 } 163 }
164 else{ 164 else{
165 KaonType = ParticleTable::getKaonType( 165 KaonType = ParticleTable::getKaonType(-iso/2);
166 DeltaType = ParticleTable::getDeltaTyp 166 DeltaType = ParticleTable::getDeltaType(3*iso/2);
167 } 167 }
168 } 168 }
169 169
170 delta->setType(DeltaType); 170 delta->setType(DeltaType);
171 delta->setMass(sampleDeltaMass(sqrtS)); 171 delta->setMass(sampleDeltaMass(sqrtS));
172 172
173 ParticleList list; 173 ParticleList list;
174 list.push_back(delta); 174 list.push_back(delta);
175 list.push_back(nucleon); 175 list.push_back(nucleon);
176 const ThreeVector &rcol = nucleon->getPosi 176 const ThreeVector &rcol = nucleon->getPosition();
177 const ThreeVector zero; 177 const ThreeVector zero;
178 Particle *kaon = new Particle(KaonType,zer 178 Particle *kaon = new Particle(KaonType,zero,rcol);
179 list.push_back(kaon); 179 list.push_back(kaon);
180 180
181 if(Random::shoot()<0.5) PhaseSpaceGenerato 181 if(Random::shoot()<0.5) PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
182 else PhaseSpaceGenerator::generateBiased(s 182 else PhaseSpaceGenerator::generateBiased(sqrtS, list, 1, angularSlope);
183 183
184 184
185 fs->addModifiedParticle(delta); 185 fs->addModifiedParticle(delta);
186 fs->addModifiedParticle(nucleon); 186 fs->addModifiedParticle(nucleon);
187 fs->addCreatedParticle(kaon); 187 fs->addCreatedParticle(kaon);
188 188
189 } 189 }
190 } 190 }
191 191