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26 // 26 //
>> 27 // $Id: G4DiffractiveSplitableHadron.cc 107317 2017-11-08 16:25:57Z gcosmo $
>> 28 // GEANT4 tag $Name: $
27 // 29 //
28 30
29 // ------------------------------------------- 31 // ------------------------------------------------------------
30 // GEANT 4 class implementation file 32 // GEANT 4 class implementation file
31 // 33 //
32 // ---------------- G4DiffractiveSplitabl 34 // ---------------- G4DiffractiveSplitableHadron----------------
33 // by Gunter Folger, August 1998. 35 // by Gunter Folger, August 1998.
34 // class splitting an interacting partic 36 // class splitting an interacting particle. Used by FTF String Model.
35 // ------------------------------------------- 37 // ------------------------------------------------------------
36 38
37 #include "G4DiffractiveSplitableHadron.hh" 39 #include "G4DiffractiveSplitableHadron.hh"
38 40
39 #include "G4ParticleDefinition.hh" 41 #include "G4ParticleDefinition.hh"
40 #include "Randomize.hh" 42 #include "Randomize.hh"
41 43
42 44
43 //============================================ 45 //============================================================================
44 46
45 G4DiffractiveSplitableHadron::G4DiffractiveSpl 47 G4DiffractiveSplitableHadron::G4DiffractiveSplitableHadron()
46 { 48 {
47 PartonIndex = -1; 49 PartonIndex = -1;
48 G4LorentzVector tmp=G4LorentzVector(0.,0.,0. <<
49 Parton[0] = new G4Parton( 1 ); 50 Parton[0] = new G4Parton( 1 );
50 Parton[1] = new G4Parton(-1 ); 51 Parton[1] = new G4Parton(-1 );
51 <<
52 Parton[0]->Set4Momentum(tmp); Parton[1]->Set <<
53 } 52 }
54 53
55 54
56 //============================================ 55 //============================================================================
57 56
58 G4DiffractiveSplitableHadron::G4DiffractiveSpl 57 G4DiffractiveSplitableHadron::G4DiffractiveSplitableHadron( const G4ReactionProduct& aPrimary ) :
59 G4VSplitableHadron( aPrimary ) 58 G4VSplitableHadron( aPrimary )
60 { 59 {
61 PartonIndex = -1; << 60 PartonIndex = -2;
62 Parton[0] = nullptr; << 61 Parton[0] = NULL;
63 Parton[1] = nullptr; <<
64 } 62 }
65 63
66 64
67 //============================================ 65 //============================================================================
68 66
69 G4DiffractiveSplitableHadron::G4DiffractiveSpl 67 G4DiffractiveSplitableHadron::G4DiffractiveSplitableHadron( const G4Nucleon& aNucleon ) :
70 G4VSplitableHadron( aNucleon ) 68 G4VSplitableHadron( aNucleon )
71 { 69 {
72 PartonIndex = -1; << 70 PartonIndex = -2;
73 Parton[0] = nullptr; << 71 Parton[0] = NULL;
74 Parton[1] = nullptr; <<
75 } 72 }
76 73
77 74
78 //============================================ 75 //============================================================================
79 76
80 G4DiffractiveSplitableHadron::G4DiffractiveSpl 77 G4DiffractiveSplitableHadron::G4DiffractiveSplitableHadron( const G4VKineticNucleon* aNucleon ) :
81 G4VSplitableHadron( aNucleon ) 78 G4VSplitableHadron( aNucleon )
82 { 79 {
83 PartonIndex = -1; << 80 PartonIndex = -2;
84 Parton[0] = nullptr; << 81 Parton[0] = NULL;
85 Parton[1] = nullptr; <<
86 } 82 }
87 83
88 84
89 //============================================ 85 //============================================================================
90 86
91 G4DiffractiveSplitableHadron::~G4DiffractiveSp << 87 G4DiffractiveSplitableHadron::~G4DiffractiveSplitableHadron() {
>> 88 //G4cout << "Destruct G4DiffractiveSplitableHadron" << Parton[0] << " " << Parton[1] << G4endl;
>> 89 //if ( Parton[0] != NULL ) { delete Parton[0]; delete Parton[1]; }
>> 90 }
92 91
93 92
94 //============================================ 93 //============================================================================
95 94
96 void G4DiffractiveSplitableHadron::SplitUp() { 95 void G4DiffractiveSplitableHadron::SplitUp() {
97 << 96 //G4cout << "SplitUp() IsSplit() Parton[0] " << IsSplit() << " " << Parton[0] << G4endl;
98 if ( IsSplit() ) return; 97 if ( IsSplit() ) return;
99 Splitting(); 98 Splitting();
100 // Split once only... 99 // Split once only...
101 if ( Parton[0] != nullptr ) return; << 100 if ( Parton[0] != NULL ) return;
102 101
103 // flavours of quark ends 102 // flavours of quark ends
104 G4int PDGcode = GetDefinition()->GetPDGEncod 103 G4int PDGcode = GetDefinition()->GetPDGEncoding();
105 G4int stringStart, stringEnd; 104 G4int stringStart, stringEnd;
106 ChooseStringEnds( PDGcode, &stringStart, &st 105 ChooseStringEnds( PDGcode, &stringStart, &stringEnd );
107 106
108 Parton[0] = new G4Parton( stringStart ); 107 Parton[0] = new G4Parton( stringStart );
109 Parton[1] = new G4Parton( stringEnd ); 108 Parton[1] = new G4Parton( stringEnd );
110 109
111 G4LorentzVector tmp=G4LorentzVector(0.,0.,0. <<
112 Parton[0]->Set4Momentum(tmp); Parton[1]->Set <<
113 <<
114 /* // 110 /* // Inversion of a string
115 if ( G4UniformRand() < 1.75 ) { //0.75 111 if ( G4UniformRand() < 1.75 ) { //0.75
116 Parton[0] = new G4Parton( stringStart ); 112 Parton[0] = new G4Parton( stringStart );
117 Parton[1] = new G4Parton( stringEnd ); 113 Parton[1] = new G4Parton( stringEnd );
118 } else { 114 } else {
119 Parton[0] = new G4Parton( stringEnd ); 115 Parton[0] = new G4Parton( stringEnd );
120 Parton[1] = new G4Parton( stringStart ); 116 Parton[1] = new G4Parton( stringStart );
121 } 117 }
122 */ 118 */
123 119
124 PartonIndex = -1; 120 PartonIndex = -1;
125 } 121 }
126 122
127 123
128 //============================================ 124 //============================================================================
129 125
130 G4Parton* G4DiffractiveSplitableHadron::GetNex 126 G4Parton* G4DiffractiveSplitableHadron::GetNextParton() {
131 ++PartonIndex; 127 ++PartonIndex;
132 if ( PartonIndex > 1 || PartonIndex < 0 ) << 128 if ( PartonIndex > 1 || PartonIndex < 0 ) return NULL;
133 G4int PartonInd( PartonIndex ); 129 G4int PartonInd( PartonIndex );
134 if ( PartonIndex == 1 ) PartonIndex = -1; 130 if ( PartonIndex == 1 ) PartonIndex = -1;
135 return Parton[ PartonInd ]; 131 return Parton[ PartonInd ];
136 } 132 }
137 133
138 134
139 //============================================ 135 //============================================================================
140 136
141 G4Parton* G4DiffractiveSplitableHadron::GetNex 137 G4Parton* G4DiffractiveSplitableHadron::GetNextAntiParton() {
142 ++PartonIndex; 138 ++PartonIndex;
143 if ( PartonIndex > 1 || PartonIndex < 0 ) << 139 if ( PartonIndex > 1 || PartonIndex < 0 ) return NULL;
144 G4int PartonInd( PartonIndex ); 140 G4int PartonInd( PartonIndex );
145 if ( PartonIndex == 1 ) PartonIndex = -1; 141 if ( PartonIndex == 1 ) PartonIndex = -1;
146 return Parton[ PartonInd ]; 142 return Parton[ PartonInd ];
147 } 143 }
148 144
149 145
150 //============================================ 146 //============================================================================
151 147
152 void G4DiffractiveSplitableHadron::SetFirstPar 148 void G4DiffractiveSplitableHadron::SetFirstParton( G4int PDGcode ) {
153 delete Parton[0]; 149 delete Parton[0];
154 Parton[0] = new G4Parton( PDGcode ); 150 Parton[0] = new G4Parton( PDGcode );
155 G4LorentzVector tmp=G4LorentzVector(0.,0.,0. <<
156 Parton[0]->Set4Momentum(tmp); <<
157 } 151 }
158 152
159 153
160 //============================================ 154 //============================================================================
161 155
162 void G4DiffractiveSplitableHadron::SetSecondPa 156 void G4DiffractiveSplitableHadron::SetSecondParton( G4int PDGcode ) {
163 delete Parton[1]; 157 delete Parton[1];
164 Parton[1] = new G4Parton( PDGcode ); 158 Parton[1] = new G4Parton( PDGcode );
165 G4LorentzVector tmp=G4LorentzVector(0.,0.,0. <<
166 Parton[1]->Set4Momentum(tmp); <<
167 } 159 }
168 160
169 161
170 //============================================ 162 //============================================================================
171 163
172 void G4DiffractiveSplitableHadron::ChooseStrin 164 void G4DiffractiveSplitableHadron::ChooseStringEnds( G4int PDGcode, G4int* aEnd,
173 165 G4int* bEnd ) const {
174 G4int absPDGcode = std::abs( PDGcode ); 166 G4int absPDGcode = std::abs( PDGcode );
175 167
176 if ( absPDGcode < 1000 ) { //-------------- 168 if ( absPDGcode < 1000 ) { //-------------------- Meson -------------
177 G4int heavy(0), light(0); 169 G4int heavy(0), light(0);
178 if (!((absPDGcode == 111)||(absPDGcode == << 170 if(!((absPDGcode == 111)||(absPDGcode == 221)||(absPDGcode == 331)))
179 { // Ordinary mes 171 { // Ordinary mesons =======================
180 heavy = absPDGcode/100; 172 heavy = absPDGcode/100;
181 light = (absPDGcode % 100)/10; 173 light = (absPDGcode % 100)/10;
182 //G4int anti = std::pow( -1 , std::max( h 174 //G4int anti = std::pow( -1 , std::max( heavy, light ) );
183 G4int anti = 1 - 2*( std::max( heavy, lig 175 G4int anti = 1 - 2*( std::max( heavy, light ) % 2 );
184 if (PDGcode < 0 ) anti *= -1; 176 if (PDGcode < 0 ) anti *= -1;
185 heavy *= anti; 177 heavy *= anti;
186 light *= -1 * anti; 178 light *= -1 * anti;
187 } 179 }
188 else 180 else
189 { // Pi0, Eta, Eta 181 { // Pi0, Eta, Eta' =======================
190 if ( G4UniformRand() < 0.5 ) {heavy = 1; << 182 if( G4UniformRand() < 0.5 ) {heavy = 1; light = -1;}
191 else {heavy = 2; << 183 else {heavy = 2; light = -2;}
192 } 184 }
193 if ( G4UniformRand() < 0.5 ) { 185 if ( G4UniformRand() < 0.5 ) {
194 *aEnd = heavy; 186 *aEnd = heavy;
195 *bEnd = light; 187 *bEnd = light;
196 } else { 188 } else {
197 *aEnd = light; 189 *aEnd = light;
198 *bEnd = heavy; 190 *bEnd = heavy;
199 } 191 }
200 } else { //-------------- 192 } else { //-------------------- Baryon --------------
201 G4int j1000 = PDGcode/1000; 193 G4int j1000 = PDGcode/1000;
202 G4int j100 = (PDGcode % 1000)/100; 194 G4int j100 = (PDGcode % 1000)/100;
203 G4int j10 = (PDGcode % 100)/10; 195 G4int j10 = (PDGcode % 100)/10;
204 196
205 if ( absPDGcode > 4000 ) { <<
206 *aEnd = j10; <<
207 if ( G4UniformRand() > 0.25 ) { <<
208 *bEnd = Diquark( j1000, j100, 0 ); <<
209 } else { <<
210 *bEnd = Diquark( j1000, j100, 1 ); <<
211 } <<
212 return; <<
213 } <<
214 <<
215 G4double SuppresUUDDSS=1.0/2.0; 197 G4double SuppresUUDDSS=1.0/2.0;
216 if ((j1000 == j100) && (j1000 == j10)) Sup << 198 if((j1000 == j100) && (j1000 == j10)) SuppresUUDDSS=1.;
217 199
218 const G4int maxNumberOfLoops = 1000; 200 const G4int maxNumberOfLoops = 1000;
219 G4int loopCounter = 0; 201 G4int loopCounter = 0;
220 do 202 do
221 { 203 {
222 G4double random = G4UniformRand(); 204 G4double random = G4UniformRand();
223 205
224 if (random < 0.33333) << 206 if(random < 0.33333)
225 { 207 {
226 if (( j100 == j10 ) && ( G4UniformRand << 208 if(( j100 == j10 ) && ( G4UniformRand() > SuppresUUDDSS )) continue;
227 *aEnd = j1000; 209 *aEnd = j1000;
228 if ( j100 == j10 ) {*bEnd << 210 if( j100 == j10 ) {*bEnd = Diquark( j100, j10, 1 );}
229 else 211 else
230 if ( G4UniformRand() > 0.25) {*bEnd << 212 if( G4UniformRand() > 0.25) {*bEnd = Diquark( j100, j10, 0 );}
231 else {*bEnd = 213 else {*bEnd = Diquark( j100, j10, 1 );}
232 break; 214 break;
233 } 215 }
234 else if (random < 0.66667) << 216 else if(random < 0.66667)
235 { 217 {
236 if (( j1000 == j10 ) && ( G4UniformRan << 218 if(( j1000 == j10 ) && ( G4UniformRand() > SuppresUUDDSS )) continue;
237 *aEnd = j100; 219 *aEnd = j100;
238 if ( j1000 == j10 ) {*bEnd << 220 if( j1000 == j10 ) {*bEnd = Diquark( j1000, j10, 1 );}
239 else 221 else
240 if ( G4UniformRand() > 0.25) {*bEnd << 222 if( G4UniformRand() > 0.25) {*bEnd = Diquark( j1000, j10, 0 );}
241 else {*bEnd = 223 else {*bEnd = Diquark( j1000, j10, 1 );}
242 break; 224 break;
243 } 225 }
244 else 226 else
245 { 227 {
246 if (( j1000 == j100 ) && ( G4UniformRa << 228 if(( j1000 == j100 ) && ( G4UniformRand() > SuppresUUDDSS )) continue;
247 *aEnd = j10; 229 *aEnd = j10;
248 if ( j1000 == j100 ) {*bEnd << 230 if( j1000 == j100 ) {*bEnd = Diquark( j1000, j100, 1 );}
249 else 231 else
250 if ( G4UniformRand() > 0.25) {*bEnd << 232 if( G4UniformRand() > 0.25) {*bEnd = Diquark( j1000, j100, 0 );}
251 else {*bEnd = 233 else {*bEnd = Diquark( j1000, j100, 1 );}
252 break; 234 break;
253 } 235 }
254 } while ( (true) && 236 } while ( (true) &&
255 ++loopCounter < maxNumberOfLoops 237 ++loopCounter < maxNumberOfLoops ); /* Loop checking, 10.08.2015, A.Ribon */
256 if ( loopCounter >= maxNumberOfLoops ) { 238 if ( loopCounter >= maxNumberOfLoops ) {
257 *aEnd = j10; *bEnd = Diquark( j1000, j10 239 *aEnd = j10; *bEnd = Diquark( j1000, j100, 1 ); // Just something acceptable, without any physics consideration.
258 } 240 }
>> 241
>> 242 /*
>> 243 if ( std::abs( j100 ) >= std::abs( j10 ) ) {
>> 244 if ( random < udspin1 ) {
>> 245 *aEnd = j1000;
>> 246 *bEnd = Diquark( j100, j10, 1 );
>> 247 } else if ( random < udspin1 + uuspin1 ) {
>> 248 *aEnd = j10;
>> 249 *bEnd = Diquark( j1000, j100, 1 );
>> 250 } else {
>> 251 *aEnd = j100;
>> 252 // Careful, there is no diquark q1=q2, (q1 q2)0, possible for Omega-
>> 253 *bEnd = Diquark( j1000, j10, j1000 != j100 ? 0 : 1 );
>> 254 }
>> 255 } else {
>> 256 // Lambda-like hadrons have two lightest quarks in spin 0
>> 257 if ( random < udspin1 ) {
>> 258 *aEnd = j1000;
>> 259 // as above, but with charmed baryons
>> 260 *bEnd = Diquark( j100, j10, j100 != j10 ? 0 : 10 );
>> 261 } else if ( random < udspin1 + uuspin1 ) {
>> 262 *aEnd = j10;
>> 263 *bEnd = Diquark( j1000, j100, 1 );
>> 264 } else {
>> 265 *aEnd = j100;
>> 266 *bEnd = Diquark( j1000, j10, 1 );
>> 267 }
>> 268 }
>> 269 */
259 270
260 } 271 }
261 } 272 }
262 273
263 274
264 //============================================ 275 //============================================================================
265 276
266 G4int G4DiffractiveSplitableHadron::Diquark( G 277 G4int G4DiffractiveSplitableHadron::Diquark( G4int aquark, G4int bquark, G4int Spin) const {
267 G4int diquarkPDG = std::max( std::abs( aquar 278 G4int diquarkPDG = std::max( std::abs( aquark ), std::abs( bquark ) ) * 1000 +
268 std::min( std::abs( aquar 279 std::min( std::abs( aquark ), std::abs( bquark ) ) * 100 +
269 2*Spin + 1; 280 2*Spin + 1;
270 return ( aquark > 0 && bquark > 0 ) ? diqu 281 return ( aquark > 0 && bquark > 0 ) ? diquarkPDG : -1*diquarkPDG;
271 } 282 }
272 283
273 284