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26 // 26 //
>> 27 // $Id: G4QGSMFragmentation.cc 84707 2014-10-20 07:15:31Z gcosmo $
27 // 28 //
28 // ------------------------------------------- 29 // -----------------------------------------------------------------------------
29 // GEANT 4 class implementation file 30 // GEANT 4 class implementation file
30 // 31 //
31 // History: first implementation, Maxim K 32 // History: first implementation, Maxim Komogorov, 10-Jul-1998
32 // ------------------------------------------- 33 // -----------------------------------------------------------------------------
33 #include "G4QGSMFragmentation.hh" 34 #include "G4QGSMFragmentation.hh"
34 #include "G4PhysicalConstants.hh" 35 #include "G4PhysicalConstants.hh"
35 #include "G4SystemOfUnits.hh" <<
36 #include "Randomize.hh" 36 #include "Randomize.hh"
37 #include "G4ios.hh" 37 #include "G4ios.hh"
38 #include "G4FragmentingString.hh" 38 #include "G4FragmentingString.hh"
39 #include "G4DiQuarks.hh" 39 #include "G4DiQuarks.hh"
40 #include "G4Quarks.hh" 40 #include "G4Quarks.hh"
41 #include "G4HadronicParameters.hh" <<
42 #include "G4Pow.hh" <<
43 41
44 //#define debug_QGSMfragmentation << 42 //#define debug_QGSMfragmentation // Uzhi Oct. 2014
45 43
46 // Class G4QGSMFragmentation 44 // Class G4QGSMFragmentation
47 //******************************************** 45 //****************************************************************************************
48 46
49 G4QGSMFragmentation::G4QGSMFragmentation() << 47 G4QGSMFragmentation::G4QGSMFragmentation() :
50 { << 48 arho(0.5), aphi(0.), an(-0.5), ala(-0.75), aksi(-1.), alft(0.5)
51 SigmaQT = 0.45 * GeV; << 49 {
52 << 50 SetStrangenessSuppression(0.41); // 0.47 0.447 Uzhi 27.09.2014 0.43 last 0.425
53 MassCut = 0.35*GeV; << 51 SetDiquarkSuppression(0.25); // 0.087 std 0.07 Uzhi 0.25 Last
54 << 52 SetDiquarkBreakProbability(0.4); // 0.05 std 0.1 Uzhi 27.09.2014
55 SetStrangenessSuppression((1.0 - 0.16)/2.) << 53 }
56 <<
57 // Check if charmed and bottom hadrons are <<
58 // set the non-zero probabilities for c-cb <<
59 // else set them to 0.0. If these probabil <<
60 // hadrons can't/can be created during the <<
61 // (i.e. not heavy) projectile hadron nucl <<
62 if ( G4HadronicParameters::Instance()->Ena <<
63 SetProbCCbar(0.0002); // According to O <<
64 SetProbBBbar(5.0e-5); // According to O <<
65 } else { <<
66 SetProbCCbar(0.0); <<
67 SetProbBBbar(0.0); <<
68 } <<
69 <<
70 SetDiquarkSuppression(0.32); <<
71 SetDiquarkBreakProbability(0.7); <<
72 <<
73 SetMinMasses(); <<
74 <<
75 arho = 0.5; // alpha_rho0 <<
76 aphi = 0.0; // alpha_fi <<
77 aJPs =-2.2; // alpha_J/Psi <<
78 aUps =-8.0; // alpha_Y ??? O. Pisk <<
79 <<
80 aksi =-1.0; <<
81 alft = 0.5; // 2 * alpha'_R *<Pt^2> <<
82 <<
83 an = -0.5 ; <<
84 ala = -0.75; // an - arho/2 + aphi/2 <<
85 alaC = an - arho/2.0 + aJPs/2.0; <<
86 alaB = an - arho/2.0 + aUps/2.0; <<
87 aXi = 0.0; // ?? <<
88 aXiC = 0.0; // ?? <<
89 aXiB = 0.0; // ?? <<
90 aXiCC = 0.0; // ?? <<
91 aXiCB = 0.0; // ?? <<
92 aXiBB = 0.0; // ?? <<
93 <<
94 SetFFq2q(); <<
95 SetFFq2qq(); <<
96 SetFFqq2q(); <<
97 SetFFqq2qq(); <<
98 // d u s c b <<
99 G4int Index[5][5] = { { 0, 1, 2, 3, 4 } <<
100 { 1, 5, 6, 7, 8 } <<
101 { 2, 6, 9, 10, 11 } <<
102 { 3, 7, 10, 12, 13 } <<
103 { 4, 8, 11, 13, 14 } <<
104 for (G4int i = 0; i < 5; i++ ) { <<
105 for ( G4int j = 0; j < 5; j++ ) { <<
106 IndexDiQ[i][j] = Index[i][j]; <<
107 } <<
108 }; <<
109 } <<
110 54
111 G4QGSMFragmentation::~G4QGSMFragmentation() 55 G4QGSMFragmentation::~G4QGSMFragmentation()
112 {} << 56 {
>> 57 }
113 58
114 //-------------------------------------------- 59 //----------------------------------------------------------------------------------------------------------
115 60
116 G4KineticTrackVector* G4QGSMFragmentation::Fra 61 G4KineticTrackVector* G4QGSMFragmentation::FragmentString(const G4ExcitedString& theString)
117 { 62 {
118 << 63 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
119 G4FragmentingString aString(theString); <<
120 SetMinimalStringMass(&aString); <<
121 <<
122 #ifdef debug_QGSMfragmentation <<
123 G4cout<<G4endl<<"QGSM StringFragm: String Ma 64 G4cout<<G4endl<<"QGSM StringFragm: String Mass "
124 <<theString.Get4M 65 <<theString.Get4Momentum().mag()<<" Pz "
125 <<theString.Get4M 66 <<theString.Get4Momentum().pz()
126 <<"-------------- 67 <<"------------------------------------"<<G4endl;
127 G4cout<<"String ends Direct "<<theString.Get 68 G4cout<<"String ends Direct "<<theString.GetLeftParton()->GetPDGcode()<<" "
128 <<theString.Get 69 <<theString.GetRightParton()->GetPDGcode()<<" "
129 <<theString.Get 70 <<theString.GetDirection()<< G4endl;
130 G4cout<<"Left mom "<<theString.GetLeftParto 71 G4cout<<"Left mom "<<theString.GetLeftParton()->Get4Momentum()<<G4endl;
131 G4cout<<"Right mom "<<theString.GetRightPart 72 G4cout<<"Right mom "<<theString.GetRightParton()->Get4Momentum()<<G4endl;
132 G4cout<<"Check for Fragmentation "<<G4endl; 73 G4cout<<"Check for Fragmentation "<<G4endl;
133 #endif << 74 #endif
134 75
135 // Can no longer modify Parameters for Fragm << 76 // Can no longer modify Parameters for Fragmentation.
136 PastInitPhase=true; << 77 PastInitPhase=true;
137 78
138 // Check if string has enough mass to fragme << 79 // check if string has enough mass to fragment...
139 G4KineticTrackVector * LeftVector=NULL; <<
140 80
141 if ( !IsItFragmentable(&aString) ) { << 81 G4KineticTrackVector * LeftVector=LightFragmentationTest(&theString);
142 LeftVector=ProduceOneHadron(&theString); <<
143 82
144 #ifdef debug_QGSMfragmentation << 83 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
145 if ( LeftVector != 0 ) G4cout<<"Non fragm << 84 if ( LeftVector != 0 ) G4cout<<"Non fragmentable - the string is converted to one hadron "<<G4endl;
146 #endif << 85 #endif
147 86
148 if ( LeftVector == nullptr ) LeftVector = << 87 if ( LeftVector != 0 ) return LeftVector;
149 return LeftVector; <<
150 } <<
151 88
152 #ifdef debug_QGSMfragmentation << 89 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
153 G4cout<<"The string will be fragmented. "<<G 90 G4cout<<"The string will be fragmented. "<<G4endl;
154 #endif << 91 #endif
155 92
156 LeftVector = new G4KineticTrackVector; << 93 LeftVector = new G4KineticTrackVector;
157 G4KineticTrackVector * RightVector=new G4Kin << 94 G4KineticTrackVector * RightVector=new G4KineticTrackVector;
158 95
159 G4ExcitedString *theStringInCMS=CopyExcited( << 96 // this should work but its only a semi deep copy. %GF G4ExcitedString theStringInCMS(theString);
160 G4LorentzRotation toCms=theStringInCMS->Tran << 97 G4ExcitedString *theStringInCMS=CPExcited(theString);
161 << 98 G4LorentzRotation toCms=theStringInCMS->TransformToAlignedCms();
162 G4bool success=false, inner_sucess=true; << 99
163 G4int attempt=0; << 100 G4bool success=false, inner_sucess=true;
164 while ( !success && attempt++ < StringLoopIn << 101 G4int attempt=0;
165 { << 102 while ( !success && attempt++ < StringLoopInterrupt )
166 #ifdef debug_QGSMfragmentation << 103 {
167 G4cout<<"Loop_toFrag "<<theStr << 104 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
168 <<theStr << 105 G4cout<<"Loop_toFrag "<<theStringInCMS->GetLeftParton()->GetPDGcode()<<" "
169 <<theStr << 106 <<theStringInCMS->GetRightParton()->GetPDGcode()<<" "
170 #endif << 107 <<theStringInCMS->GetDirection()<< G4endl;
>> 108 #endif
171 109
172 G4FragmentingString *currentString=new G4F 110 G4FragmentingString *currentString=new G4FragmentingString(*theStringInCMS);
173 111
174 std::for_each(LeftVector->begin(), LeftVec 112 std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack());
175 LeftVector->clear(); 113 LeftVector->clear();
176 std::for_each(RightVector->begin(), RightV 114 std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack());
177 RightVector->clear(); 115 RightVector->clear();
178 116
179 inner_sucess=true; // set false on failur 117 inner_sucess=true; // set false on failure..
180 const G4int maxNumberOfLoops = << 118
181 G4int loopCounter = -1; << 119 while (! StopFragmenting(currentString) )
182 while (! StopFragmenting(currentString) && <<
183 { // Split current string into hadron + n 120 { // Split current string into hadron + new string
184 121
185 #ifdef debug_QGSMfragm << 122 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
186 G4cout<<"The string ca << 123 G4cout<<"The string can fragment. "<<G4endl;;
187 #endif << 124 #endif
188 G4FragmentingString *newString=0; // us 125 G4FragmentingString *newString=0; // used as output from SplitUp...
189 G4KineticTrack * Hadron=Splitup(currentS 126 G4KineticTrack * Hadron=Splitup(currentString,newString);
190 127
191 if ( Hadron != 0 ) << 128 if ( Hadron != 0 ) // && IsFragmentable(newString)) // Closed by Uzhi, Oct. 2014
192 { 129 {
193 #ifdef debug_QGSMfr << 130 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
194 G4cout<<"Hadron pro << 131 G4cout<<"Hadron prod at fragm. "<<Hadron->GetDefinition()->GetParticleName()<<G4endl;
195 #endif << 132 #endif
196 // To close the pro <<
197 if ( currentString->GetDecayDirection 133 if ( currentString->GetDecayDirection() > 0 )
198 LeftVector->push_back(Hadron); 134 LeftVector->push_back(Hadron);
199 else 135 else
200 RightVector->push_back(Hadron); 136 RightVector->push_back(Hadron);
201 137
202 delete currentString; 138 delete currentString;
203 currentString=newString; 139 currentString=newString;
204 140
205 } else { 141 } else {
206 142
207 #ifdef debug_QGSMfr << 143 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
208 G4cout<<"abandon .. << 144 G4cout<<"abandon ... start from the beginning ---------------"<<G4endl;
209 #endif << 145 #endif
210 146
211 // Abandon ... start from the beginni << 147 // abandon ... start from the beginning
212 if (newString) delete newString; 148 if (newString) delete newString;
>> 149 if (Hadron) delete Hadron;
213 inner_sucess=false; 150 inner_sucess=false;
214 break; 151 break;
215 } 152 }
216 } << 153 }
217 if ( loopCounter >= maxNumberO <<
218 inner_sucess=false; <<
219 } <<
220 <<
221 // Split current string into 2 final Hadro 154 // Split current string into 2 final Hadrons
222 #ifdef debug_QGSMfragmentation << 155 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
223 if( inner_sucess ) { << 156 G4cout<<"Split remaining string into 2 final hadrons."<<G4endl;
224 G4cout<<"Split remaining str << 157 #endif
225 } else { << 158
226 G4cout<<" New attempt to fragment string << 159 if ( inner_sucess && //true) // Uzhi -- No Last Splitting
227 } <<
228 #endif <<
229 // To the close production of <<
230 if ( inner_sucess && <<
231 SplitLast(currentString,LeftVector, R 160 SplitLast(currentString,LeftVector, RightVector) )
232 { 161 {
233 success=true; 162 success=true;
234 } 163 }
235 delete currentString; 164 delete currentString;
236 } 165 }
237 166
238 delete theStringInCMS; 167 delete theStringInCMS;
239 168
240 if ( ! success ) 169 if ( ! success )
241 { 170 {
242 std::for_each(LeftVector->begin(), LeftVec 171 std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack());
243 LeftVector->clear(); 172 LeftVector->clear();
244 std::for_each(RightVector->begin(), RightV 173 std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack());
245 delete RightVector; 174 delete RightVector;
246 return LeftVector; 175 return LeftVector;
247 } 176 }
248 177
249 // Join Left- and RightVector into LeftVecto 178 // Join Left- and RightVector into LeftVector in correct order.
250 while(!RightVector->empty()) /* Loop checki << 179 while(!RightVector->empty())
251 { 180 {
252 LeftVector->push_back(RightVector->back( 181 LeftVector->push_back(RightVector->back());
253 RightVector->erase(RightVector->end()-1) 182 RightVector->erase(RightVector->end()-1);
254 } 183 }
255 delete RightVector; 184 delete RightVector;
256 185
257 CalculateHadronTimePosition(theString.Get4Mo 186 CalculateHadronTimePosition(theString.Get4Momentum().mag(), LeftVector);
258 187
259 G4LorentzRotation toObserverFrame(toCms.inve 188 G4LorentzRotation toObserverFrame(toCms.inverse());
260 189
261 for (size_t C1 = 0; C1 < LeftVector->size(); << 190 for(size_t C1 = 0; C1 < LeftVector->size(); C1++)
262 { 191 {
263 G4KineticTrack* Hadron = LeftVector->oper 192 G4KineticTrack* Hadron = LeftVector->operator[](C1);
264 G4LorentzVector Momentum = Hadron->Get4Mo 193 G4LorentzVector Momentum = Hadron->Get4Momentum();
265 Momentum = toObserverFrame*Momentum; 194 Momentum = toObserverFrame*Momentum;
266 Hadron->Set4Momentum(Momentum); 195 Hadron->Set4Momentum(Momentum);
267 G4LorentzVector Coordinate(Hadron->GetPos 196 G4LorentzVector Coordinate(Hadron->GetPosition(), Hadron->GetFormationTime());
268 Momentum = toObserverFrame*Coordinate; 197 Momentum = toObserverFrame*Coordinate;
269 Hadron->SetFormationTime(Momentum.e()); 198 Hadron->SetFormationTime(Momentum.e());
270 G4ThreeVector aPosition(Momentum.vect()); 199 G4ThreeVector aPosition(Momentum.vect());
271 Hadron->SetPosition(theString.GetPosition 200 Hadron->SetPosition(theString.GetPosition()+aPosition);
272 } 201 }
273 return LeftVector; 202 return LeftVector;
274 } << 203
275 204
276 //-------------------------------------------- <<
277 205
278 G4bool G4QGSMFragmentation::IsItFragmentable(c <<
279 { <<
280 return sqr( MinimalStringMass + MassCut ) < <<
281 } 206 }
282 207
283 //-------------------------------------------- 208 //----------------------------------------------------------------------------------------------------------
284 209
285 G4bool G4QGSMFragmentation::StopFragmenting(co << 210 G4double G4QGSMFragmentation::GetLightConeZ(G4double zmin, G4double zmax, G4int PartonEncoding,
286 { << 211 G4ParticleDefinition* pHadron, G4double , G4double )
287 SetMinimalStringMass(string); << 212 {
288 if ( MinimalStringMass < 0.0 ) return << 213 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
289 << 214 G4cout<<"GetLightConeZ zmin zmax Parton pHadron "<<zmin<<" "<<zmax<<" "<<PartonEncoding<<" "<<pHadron->GetParticleName()<<G4endl;
290 G4double smass = string->Mass(); << 215 #endif
291 G4double x = (string->IsAFourQuarkString()) << 216 G4double z;
292 : 0.66e-6*(smass - MinimalStringMass)*(sma << 217 G4double d1, d2, yf;
293 << 218 G4double invD1(0.),invD2(0.), r1(0.),r2(0.),r12(0.);
294 G4bool res = true; <<
295 if(x > 0.0) { <<
296 res = (x < 200.) ? (G4UniformRand() <<
297 } <<
298 return res; <<
299 } <<
300 <<
301 //-------------------------------------------- <<
302 <<
303 G4KineticTrack * G4QGSMFragmentation::Splitup( <<
304 G4FragmentingStri <<
305 { <<
306 #ifdef debug_QGSMfragmentation <<
307 G4cout<<G4endl; <<
308 G4cout<<"Start SplitUP (G4VLongitudinal <<
309 G4cout<<"String partons: " <<string->Ge <<
310 <<string->Ge <<
311 <<"Direction " <<string->Ge <<
312 #endif <<
313 <<
314 //... random choice of string end to us <<
315 G4int SideOfDecay = (G4UniformRand() < <<
316 if (SideOfDecay < 0) <<
317 { <<
318 string->SetLeftPartonStable(); <<
319 } else <<
320 { <<
321 string->SetRightPartonStable(); <<
322 } <<
323 <<
324 G4ParticleDefinition *newStringEnd; <<
325 G4ParticleDefinition * HadronDefinition <<
326 if (string->DecayIsQuark()) <<
327 { <<
328 G4double ProbDqADq = GetDiquarkSuppress(); <<
329 <<
330 G4int NumberOfpossibleBaryons = 2; <<
331 <<
332 if (string->GetLeftParton()->GetParticleSu <<
333 if (string->GetRightParton()->GetParticleS <<
334 <<
335 G4double ActualProb = ProbDqADq ; <<
336 ActualProb *= (1.0-G4Exp(2.0*(1.0 - <<
337 <<
338 SetDiquarkSuppression(ActualProb); <<
339 <<
340 HadronDefinition= QuarkSplitup(strin <<
341 <<
342 SetDiquarkSuppression(ProbDqADq); <<
343 } else { <<
344 HadronDefinition= DiQuarkSplitup(str <<
345 } <<
346 <<
347 if ( HadronDefinition == NULL ) return <<
348 <<
349 #ifdef debug_QGSMfragmentation <<
350 G4cout<<"The parton "<<string->GetDecay <<
351 <<" produces hadron "<<HadronDefi <<
352 <<" and is transformed to "<<newS <<
353 G4cout<<"The side of the string decay L <<
354 #endif <<
355 // create new String from old, ie. keep <<
356 <<
357 newString=new G4FragmentingString(*stri <<
358 <<
359 <<
360 #ifdef debug_QGSMfragmentation <<
361 G4cout<<"An attempt to determine its en <<
362 #endif <<
363 G4LorentzVector* HadronMomentum=SplitEa <<
364 219
365 delete newString; newString=0; << 220 G4int absCode = std::abs( PartonEncoding );
366 << 221 G4int absHadronCode=std::abs(pHadron->GetPDGEncoding());
367 G4KineticTrack * Hadron =0; <<
368 if ( HadronMomentum != 0 ) { <<
369 222
370 #ifdef debug_QGSMfragmentation << 223 G4int q1, q2, q3;
371 G4cout<<"The attempt was successful << 224 q1 = absHadronCode/1000; q2 = (absHadronCode % 1000)/100; q3 = (absHadronCode % 100)/10;
372 #endif <<
373 G4ThreeVector Pos; <<
374 Hadron = new G4KineticTrack(HadronDefinit <<
375 <<
376 newString=new G4FragmentingString(*st <<
377 <<
378 delete HadronMomentum; <<
379 } <<
380 else <<
381 { <<
382 #ifdef debug_QGSMfragmentation <<
383 G4cout<<"The attempt was not successf <<
384 #endif <<
385 } <<
386 <<
387 #ifdef debug_VStringDecay <<
388 G4cout<<"End SplitUP (G4VLongitudinalSt <<
389 #endif <<
390 225
391 return Hadron; << 226 G4bool StrangeHadron = (q1 == 3) || (q2 == 3) || (q3 == 3);
392 } <<
393 <<
394 //-------------------------------------------- <<
395 <<
396 G4ParticleDefinition *G4QGSMFragmentation::DiQ <<
397 <<
398 { <<
399 //... can Diquark break or not? <<
400 if (G4UniformRand() < DiquarkBreakProb ) / <<
401 { <<
402 G4int stableQuarkEncoding = decay->GetPD <<
403 G4int decayQuarkEncoding = (decay->GetPD <<
404 227
405 if (G4UniformRand() < 0.5) << 228 if (absCode < 10)
406 { << 229 { // A quark fragmentation ----------------------------
407 G4int Swap = stableQuarkEncoding; << 230 if(absCode == 1 || absCode == 2)
408 stableQuarkEncoding = decayQuarkEncod << 231 {
409 decayQuarkEncoding = Swap; << 232 if(absHadronCode < 1000)
>> 233 { // Meson produced
>> 234 if( !StrangeHadron ) {d1=2.0; d2 = -arho + alft;}
>> 235 else {d1=1.0; d2 = -aphi + alft;}
>> 236 } else
>> 237 { // Baryon produced
>> 238 if( !StrangeHadron ) {d1=0.0; d2 = arho - 2.0*an + alft;}
>> 239 else {d1=0.0; d2 = 2.0*arho - 2.0*an - aphi + alft;}
410 } 240 }
>> 241 }
>> 242 else if(absCode == 3)
>> 243 {
>> 244 if(absHadronCode < 1000){d1=1.0 - aphi; d2 = -arho + alft;} // Meson produced s->K + u/d
>> 245 else {d1=1.0 - aphi; d2 = arho - 2.0*an + alft;} // Baryon produced
411 246
412 G4int IsParticle=(decayQuarkEncoding>0) << 247 } else throw G4HadronicException(__FILE__, __LINE__, "Unknown PDGencoding in G4QGSMFragmentation::G4LightConeZ");
413 248
414 G4double StrSup=GetStrangeSuppress(); << 249 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
415 SetStrangenessSuppression((1.0 - 0.07)/2 << 250 G4cout<<"d1 d2 "<<d1<<" "<<d2<<G4endl;
416 pDefPair QuarkPair = CreatePartonPair(Is << 251 #endif
417 SetStrangenessSuppression(StrSup); <<
418 252
419 //... Build new Diquark << 253 d1+=1.0; d2+=1.0;
420 G4int QuarkEncoding=QuarkPair.second->Ge <<
421 G4int i10 = std::max(std::abs(QuarkEnco <<
422 G4int i20 = std::min(std::abs(QuarkEnco <<
423 G4int spin = (i10 != i20 && G4UniformRan <<
424 G4int NewDecayEncoding = -1*IsParticle*( <<
425 <<
426 created = FindParticle(NewDecayEncoding) <<
427 G4ParticleDefinition * decayQuark=FindPa <<
428 G4ParticleDefinition * had=hadronizer->B <<
429 254
430 DecayQuark = decay->GetPDGEncoding(); << 255 invD1=1./d1; invD2=1./d2;
431 NewQuark = NewDecayEncoding; <<
432 256
433 return had; << 257 do
>> 258 {
>> 259 r1=std::pow(G4UniformRand(),invD1);
>> 260 r2=std::pow(G4UniformRand(),invD2);
>> 261 r12=r1+r2;
>> 262 z=r1/r12;
>> 263 } while( (r12 > 1.0) || !((zmin <= z)&&(z <= zmax)));
434 264
435 } else { //... Diquark does not break << 265 return z;
>> 266 }
>> 267 else
>> 268 { // A di-quark fragmentation -------------------------
>> 269 if(absCode == 1103 || absCode == 2101 ||
>> 270 absCode == 2203 || absCode == 2103)
>> 271 {
>> 272 if(absHadronCode < 1000) // Meson production
>> 273 {
>> 274 if( !StrangeHadron ) {d1=1.0; d2= arho - 2.0*an + alft;}
>> 275 else {d1=1.0; d2 = 2.*arho - 2.0*an - aphi + alft;}
>> 276 } else // Baryon production
>> 277 {
>> 278 if( !StrangeHadron ) {d1=2.0*(arho - an); d2= -arho + alft;}
>> 279 else {d1=2.0*(arho - an); d2 =-aphi + alft;}
>> 280 }
>> 281
>> 282 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
>> 283 G4cout<<"d1 d2 "<<d1<<" "<<d2<<G4endl;
>> 284 #endif
>> 285
>> 286 d1+=1.0; d2+=1.0;
>> 287 invD1=1./d1; invD2=1./d2;
>> 288
>> 289 do
>> 290 {
>> 291 r1=std::pow(G4UniformRand(),invD1);
>> 292 r2=std::pow(G4UniformRand(),invD2);
>> 293 r12=r1+r2;
>> 294 z=r1/r12;
>> 295 } while( (r12 > 1.0) || !((zmin <= z)&&(z <= zmax)));
436 296
437 G4int IsParticle=(decay->GetPDGEncoding( << 297 return z;
438 G4double StrSup=GetStrangeSuppress(); / << 298 }
439 SetStrangenessSuppression((1.0 - 0.07)/2 << 299 else if(absCode == 3101 || absCode == 3103 || // For strange d-quarks
440 pDefPair QuarkPair = CreatePartonPair(Is << 300 absCode == 3201 || absCode == 3203)
441 SetStrangenessSuppression(StrSup); << 301 {
>> 302 d2 = (alft - (2.*ala - arho));
442 303
443 created = QuarkPair.second; << 304 }
>> 305 else
>> 306 {
>> 307 d2 = (alft - (2.*aksi - arho));
>> 308 }
444 309
445 DecayQuark = decay->GetPDGEncoding(); << 310 do
446 NewQuark = created->GetPDGEncoding(); << 311 {
>> 312 z = zmin + G4UniformRand() * (zmax - zmin);
>> 313 d1 = (1. - z);
>> 314 yf = std::pow(d1, d2);
>> 315 }
>> 316 while (G4UniformRand() > yf);
>> 317 }
447 318
448 G4ParticleDefinition * had=hadronizer->B << 319 return z;
449 return had; <<
450 } <<
451 } 320 }
452 <<
453 //-------------------------------------------- 321 //-----------------------------------------------------------------------------------------
454 322
455 G4LorentzVector * G4QGSMFragmentation::SplitEa 323 G4LorentzVector * G4QGSMFragmentation::SplitEandP(G4ParticleDefinition * pHadron,
456 << 324 G4FragmentingString * string, // Uzhi
457 << 325 G4FragmentingString * NewString) // Uzhi Oct. 2014
458 { 326 {
459 G4double HadronMass = pHadron->GetPDGMa 327 G4double HadronMass = pHadron->GetPDGMass();
460 328
461 SetMinimalStringMass(NewString); << 329 G4double MinimalStringMass= FragmentationMass(NewString,&G4HadronBuilder::BuildHighSpin);
462 <<
463 if ( MinimalStringMass < 0.0 ) return n <<
464 330
465 #ifdef debug_QGSMfragmentation << 331 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
466 G4cout<<"G4QGSMFragmentation::SplitEand << 332 G4cout<<"G4QGSMFragmentation::SplitEandP "<<pHadron->GetParticleName()<<G4endl;
467 G4cout<<"String 4 mom, String M "<<stri << 333 G4cout<<"String 4 mom, String M "<<string->Get4Momentum()<<" "<<string->Mass()<<G4endl;
468 G4cout<<"HadM MinimalStringMassLeft Str << 334 G4cout<<"HadM MinimalStringMassLeft StringM hM+sM "<<HadronMass<<" "<<MinimalStringMass<<" "
469 <<string->Mass()<<" "<<HadronMass << 335 <<string->Mass()<<" "<<HadronMass+MinimalStringMass<<G4endl;
470 #endif << 336 #endif
471 337
472 if (HadronMass + MinimalStringMass > st << 338 if(HadronMass + MinimalStringMass > string->Mass())
473 { << 339 {
474 #ifdef debug_QGSMfragmentation << 340 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
475 G4cout<<"Mass of the string is not su << 341 G4cout<<"Mass of the string is not sufficient to produce the hadron!"<<G4endl;
476 #endif << 342 #endif
477 return 0; 343 return 0;
478 } // have to start all over! << 344 }// have to start all over!
479 345
480 // calculate and assign hadron transver 346 // calculate and assign hadron transverse momentum component HadronPx andHadronPy
481 G4double StringMT2 = string->MassT2(); 347 G4double StringMT2 = string->MassT2();
482 G4double StringMT = std::sqrt(StringMT 348 G4double StringMT = std::sqrt(StringMT2);
483 349
484 G4LorentzVector String4Momentum = strin 350 G4LorentzVector String4Momentum = string->Get4Momentum();
485 String4Momentum.setPz(0.); 351 String4Momentum.setPz(0.);
486 G4ThreeVector StringPt = String4Momentu 352 G4ThreeVector StringPt = String4Momentum.vect();
487 353
488 G4ThreeVector HadronPt , RemSysPt; 354 G4ThreeVector HadronPt , RemSysPt;
489 G4double HadronMassT2, ResidualMas 355 G4double HadronMassT2, ResidualMassT2;
490 356
491 // Mt distribution is implemented <<
492 G4double HadronMt, Pt, Pt2, phi; <<
493 <<
494 //... sample Pt of the hadron 357 //... sample Pt of the hadron
495 G4int attempt=0; 358 G4int attempt=0;
496 do 359 do
497 { 360 {
498 attempt++; if (attempt > StringLoopIn << 361 attempt++; if(attempt > StringLoopInterrupt) return 0;
499 362
500 HadronMt = HadronMass - 200.0*G4Log(G << 363 HadronPt =SampleQuarkPt() + string->DecayPt();
501 Pt2 = sqr(HadronMt)-sqr(HadronMass); << 364 HadronPt.setZ(0);
502 phi = 2.*pi*G4UniformRand(); << 365 RemSysPt = StringPt - HadronPt;
503 G4ThreeVector SampleQuarkPtw= G4Three <<
504 HadronPt =SampleQuarkPtw + string->D <<
505 HadronPt.setZ(0); <<
506 RemSysPt = StringPt - HadronPt; <<
507 366
508 HadronMassT2 = sqr(HadronMass) + Hadr << 367 HadronMassT2 = sqr(HadronMass) + HadronPt.mag2();
509 ResidualMassT2=sqr(MinimalStringMass) << 368 ResidualMassT2=sqr(MinimalStringMass) + RemSysPt.mag2();
510 369
511 } while (std::sqrt(HadronMassT2) + std: << 370 } while(std::sqrt(HadronMassT2) + std::sqrt(ResidualMassT2) > StringMT);
512 371
513 //... sample z to define hadron longit 372 //... sample z to define hadron longitudinal momentum and energy
514 //... but first check the available pha 373 //... but first check the available phase space
515 374
516 G4double Pz2 = (sqr(StringMT2 - HadronM << 375 G4double Pz2 = (sqr(StringMT2 - HadronMassT2 - ResidualMassT2) -
517 4*HadronMassT2 * ResidualMassT2)/4./ << 376 4*HadronMassT2 * ResidualMassT2)/4./StringMT2;
>> 377
>> 378 if(Pz2 < 0 ) {return 0;} // have to start all over!
518 379
519 if ( Pz2 < 0 ) {return 0;} // << 380 //... then compute allowed z region z_min <= z <= z_max
520 381
521 //... then compute allowed z region z_ << 382 G4double Pz = std::sqrt(Pz2);
>> 383 G4double zMin = (std::sqrt(HadronMassT2+Pz2) - Pz)/std::sqrt(StringMT2);
>> 384 G4double zMax = (std::sqrt(HadronMassT2+Pz2) + Pz)/std::sqrt(StringMT2);
522 385
523 G4double Pz = std::sqrt(Pz2); << 386 /* close by Uzhi, Oct. 2014
524 G4double zMin = (std::sqrt(HadronMassT2 << 387 G4double DecayQuarkMass2 = sqr(string->GetDecayParton()->GetPDGMass());
525 G4double zMax = (std::sqrt(HadronMassT2 << 388 G4double HadronMass2T = sqr(HadronMass) + HadronPt.mag2();
526 389
>> 390 if (DecayQuarkMass2 + HadronMass2T >= SmoothParam*(string->Mass2()) )
>> 391 return 0; // have to start all over!
>> 392
>> 393 //... then compute allowed z region z_min <= z <= z_max
>> 394
>> 395 // G4double zMin = HadronMass2T/(string->Mass2());
>> 396 // G4double zMax = 1. - DecayQuarkMass2/(string->Mass2());
>> 397 */
527 if (zMin >= zMax) return 0; // have 398 if (zMin >= zMax) return 0; // have to start all over!
528 399
529 G4double z = GetLightConeZ(zMin, zMax, 400 G4double z = GetLightConeZ(zMin, zMax,
530 string->GetDecayParton() << 401 string->GetDecayParton()->GetPDGEncoding(), pHadron,
531 HadronPt.x(), HadronPt.y << 402 HadronPt.x(), HadronPt.y());
532 403
533 //... now compute hadron longitudinal m 404 //... now compute hadron longitudinal momentum and energy
534 // longitudinal hadron momentum compone 405 // longitudinal hadron momentum component HadronPz
535 406
536 HadronPt.setZ( 0.5* string->GetDecayDir << 407 HadronPt.setZ(0.5* string->GetDecayDirection() *
537 (z * string->LightConeDecay() - << 408 (z * string->LightConeDecay() -
538 HadronMassT2/(z * string->LightCone << 409 HadronMassT2/(z * string->LightConeDecay())));
539 G4double HadronE = 0.5* (z * string->L << 410 G4double HadronE = 0.5* (z * string->LightConeDecay() +
540 HadronMassT2/(z * string->LightConeDe << 411 HadronMassT2/(z * string->LightConeDecay()));
541 412
542 G4LorentzVector * a4Momentum= new G4Lor 413 G4LorentzVector * a4Momentum= new G4LorentzVector(HadronPt,HadronE);
543 414
544 #ifdef debug_QGSMfragmentation << 415 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
545 G4cout<<"string->GetDecayDirection() st << 416 G4cout<<"string->GetDecayDirection() string->LightConeDecay() "
546 <<string->GetDecayDirection()<<" << 417 <<string->GetDecayDirection()<<" "<<string->LightConeDecay()<<G4endl;
547 G4cout<<"HadronPt,HadronE "<<HadronPt<< << 418 G4cout<<"HadronPt,HadronE "<<HadronPt<<" "<<HadronE<<G4endl;
548 G4cout<<"Out of QGSM SplitEandP "<<G4en << 419 // G4cout<<"String4Momentum "<<String4Momentum<<G4endl;
549 #endif << 420 //G4int Uzhi; G4cin>>Uzhi;
>> 421 G4cout<<"Out of QGSM SplitEandP "<<G4endl;
>> 422 #endif
550 423
551 return a4Momentum; 424 return a4Momentum;
552 } 425 }
553 426
554 //-------------------------------------------- <<
555 <<
556 G4double G4QGSMFragmentation::GetLightConeZ(G4 <<
557 G4 <<
558 { <<
559 G4double lambda = 2.0*(sqr(ptx)+sqr(pty))/sq <<
560 <<
561 #ifdef debug_QGSMfragmentation <<
562 G4cout<<"GetLightConeZ zmin zmax Parton pHad <<
563 <<" "/*<< pHadron->GetParticleName() * <<
564 #endif <<
565 <<
566 G4double z(0.); <<
567 G4int DiQold(0), DiQnew(0); <<
568 G4double d1(-1.0), d2(0.); <<
569 G4double invD1(0.),invD2(0.), r1(0.),r2(0.), <<
570 <<
571 G4int absDecayQuarkCode = std::abs( DecayQua <<
572 G4int absNewQuarkCode = std::abs( NewQuark <<
573 <<
574 G4int q1(0), q2(0); <<
575 // q1 = absDecayQuarkCode/1000; q2 = (absDe <<
576 <<
577 G4int qA(0), qB(0); <<
578 // qA = absNewQuarkCode/1000; qB = (absNe <<
579 <<
580 if ( (absDecayQuarkCode < 6) && (absNewQuark <<
581 d1 = FFq2q[absDecayQuarkCode-1][absNewQuar <<
582 } <<
583 <<
584 if ( (absDecayQuarkCode < 6) && (absNewQuark <<
585 qA = absNewQuarkCode/1000; qB = (absNewQu <<
586 d1 = FFq2qq[absDecayQuarkCode-1][DiQnew][0] <<
587 } <<
588 <<
589 if ( (absDecayQuarkCode > 6) && (absNewQuark <<
590 q1 = absDecayQuarkCode/1000; q2 = (absDeca <<
591 d1 = FFqq2q[DiQold][absNewQuarkCode-1][0]; <<
592 } <<
593 <<
594 if ( d1 < 0. ) { <<
595 q1 = absDecayQuarkCode/1000; q2 = (absDeca <<
596 qA = absNewQuarkCode/1000; qB = (absNewQ <<
597 d1 = FFqq2qq[DiQold][DiQnew][0]; d2 = FFqq <<
598 } <<
599 <<
600 d2 +=lambda; <<
601 d1+=1.0; d2+=1.0; <<
602 <<
603 invD1=1./d1; invD2=1./d2; <<
604 <<
605 const G4int maxNumberOfLoops = 10000; <<
606 G4int loopCounter = 0; <<
607 do // Jong's algorithm <<
608 { <<
609 r1=G4Pow::GetInstance()->powA(G4UniformRan <<
610 r2=G4Pow::GetInstance()->powA(G4UniformRan <<
611 r12=r1+r2; <<
612 z=r1/r12; <<
613 } while ( ( (r12 > 1.0) || !((zmin <= z)&&(z <<
614 ++loopCounter < maxNumberOfLoops ) <<
615 <<
616 if ( loopCounter >= maxNumberOfLoops ) { <<
617 z = 0.5*(zmin + zmax); // Just a value be <<
618 } <<
619 <<
620 return z; <<
621 } <<
622 427
623 //-------------------------------------------- 428 //-----------------------------------------------------------------------------------------
624 429
625 G4bool G4QGSMFragmentation::SplitLast(G4Fragme 430 G4bool G4QGSMFragmentation::SplitLast(G4FragmentingString * string,
626 G4KineticTrackVector * Lef << 431 G4KineticTrackVector * LeftVector,
627 G4KineticTrackVector * Right << 432 G4KineticTrackVector * RightVector)
628 { 433 {
629 //... perform last cluster decay 434 //... perform last cluster decay
630 435
631 G4ThreeVector ClusterVel =string->Get4Mome 436 G4ThreeVector ClusterVel =string->Get4Momentum().boostVector();
632 G4double ResidualMass =string->Mass(); << 437 G4double ResidualMass =string->Mass();
633 438
634 #ifdef debug_QGSMfragmentation << 439 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
635 G4cout<<"Split last----------------------- << 440 G4cout<<"Split last-----------------------------------------"<<G4endl;
636 G4cout<<"StrMass "<<ResidualMass<<" q's " << 441 G4cout<<"StrMass "<<ResidualMass<<" q's "
637 <<string->GetLeftParton()->GetPartic << 442 <<string->GetLeftParton()->GetParticleName()<<" "
638 <<string->GetRightParton()->GetParti << 443 <<string->GetRightParton()->GetParticleName()<<G4endl;
639 #endif << 444 #endif
640 445
>> 446 G4double ClusterMassCut = ClusterMass; // Taken from G4VLongitudinalStringDecay
641 G4int cClusterInterrupt = 0; 447 G4int cClusterInterrupt = 0;
642 G4ParticleDefinition *LeftHadron = nullptr << 448 G4ParticleDefinition * LeftHadron, * RightHadron;
643 G4ParticleDefinition *RightHadron = nullpt <<
644 const G4int maxNumberOfLoops = 1000; <<
645 G4int loopCounter = 0; <<
646 <<
647 G4double LeftHadronMass(0.); G4double Righ <<
648 do 449 do
649 { 450 {
650 if (cClusterInterrupt++ >= ClusterLoop << 451 if (cClusterInterrupt++ >= ClusterLoopInterrupt)
651 LeftHadronMass = -MaxMass; RightHadron << 452 {
>> 453 return false;
>> 454 }
652 455
653 G4ParticleDefinition * quark = nullptr; << 456 G4ParticleDefinition * quark = NULL;
654 string->SetLeftPartonStable(); // to query q 457 string->SetLeftPartonStable(); // to query quark contents..
655 458
656 if (string->DecayIsQuark() && string->Stable 459 if (string->DecayIsQuark() && string->StableIsQuark() )
657 { 460 {
658 //... there are quarks on cluster ends << 461 //... there are quarks on cluster ends
659 << 462 LeftHadron= QuarkSplitup(string->GetLeftParton(), quark);
660 G4int IsParticle=(string->GetLeftParton()- << 463 } else {
661 // if we have a quark, we need << 464 //... there is a Diquark on cluster ends
>> 465 G4int IsParticle;
>> 466 if ( string->StableIsQuark() ) {
>> 467 IsParticle=(string->GetLeftParton()->GetPDGEncoding()>0) ? -1 : +1;
>> 468 } else {
>> 469 IsParticle=(string->GetLeftParton()->GetPDGEncoding()>0) ? +1 : -1;
>> 470 }
662 471
663 pDefPair QuarkPair = CreatePartonPair(IsPa << 472 pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted
664 quark = QuarkPair.second; << 473 quark = QuarkPair.second;
>> 474 LeftHadron=hadronizer->Build(QuarkPair.first, string->GetLeftParton());
>> 475 }
665 476
666 LeftHadron= hadronizer->Build(QuarkPair.fi << 477 RightHadron = hadronizer->Build(string->GetRightParton(), quark);
667 if ( LeftHadron == NULL ) continue; <<
668 RightHadron = hadronizer->Build(stri <<
669 if ( RightHadron == NULL ) continue; <<
670 } else if( (!string->DecayIsQuark() && stri <<
671 ( string->DecayIsQuark() && !stri <<
672 //... there is a Diquark on one of cluster <<
673 G4int IsParticle; <<
674 if ( string->StableIsQuark() ) { <<
675 IsParticle=(string->GetLeftParton()->Get <<
676 } else { <<
677 IsParticle=(string->GetLeftParton()->Get <<
678 } <<
679 <<
680 //G4double ProbSaS = 1.0 - 2.0 * G <<
681 //G4double ActualProb = ProbSaS * 1. <<
682 //SetStrangenessSuppression((1.0-Act <<
683 <<
684 pDefPair QuarkPair = CreatePartonPai <<
685 //SetStrangenessSuppression((1.0-Pro <<
686 quark = QuarkPair.second; <<
687 LeftHadron=hadronizer->Build(QuarkPa <<
688 if ( LeftHadron == NULL ) continue; <<
689 RightHadron = hadronizer->Build(stri <<
690 if ( RightHadron == NULL ) continue; <<
691 } else { // Diquark and anti-diquark <<
692 if (cClusterInterrupt++ >= ClusterLo <<
693 G4int LeftQuark1= string->GetLeftPar <<
694 G4int LeftQuark2=(string->GetLeftPar <<
695 G4int RightQuark1= string->GetRightP <<
696 G4int RightQuark2=(string->GetRightP <<
697 if (G4UniformRand()<0.5) { <<
698 LeftHadron =hadronizer->Build(Fin <<
699 RightHadron =hadronizer->Build(Fin <<
700 } else { <<
701 LeftHadron =hadronizer->Build(Fin <<
702 RightHadron =hadronizer->Build(Fin <<
703 } <<
704 if ( (LeftHadron == NULL) || (RightHadron <<
705 } <<
706 LeftHadronMass = LeftHadron->GetPDGMa <<
707 RightHadronMass = RightHadron->GetPDGM <<
708 //... repeat procedure, if mass of clu <<
709 } while ( ( ResidualMass <= LeftHadronMass <<
710 && ++loopCounter < maxNumberOfLo <<
711 478
712 if ( loopCounter >= maxNumberOfLoops ) { << 479 //... repeat procedure, if mass of cluster is too low to produce hadrons
713 return false; << 480 //... ClusterMassCut = 0.15*GeV model parameter
714 } << 481 if ( quark->GetParticleSubType()== "quark" ) {ClusterMassCut = 0.;}
>> 482 else {ClusterMassCut = ClusterMass;}
>> 483 }
>> 484 while (ResidualMass <= LeftHadron->GetPDGMass() + RightHadron->GetPDGMass() + ClusterMassCut);
715 485
716 //... compute hadron momenta and energies 486 //... compute hadron momenta and energies
717 G4LorentzVector LeftMom, RightMom; 487 G4LorentzVector LeftMom, RightMom;
718 G4ThreeVector Pos; 488 G4ThreeVector Pos;
719 Sample4Momentum(&LeftMom , LeftHadron->Get 489 Sample4Momentum(&LeftMom , LeftHadron->GetPDGMass() ,
720 &RightMom, RightHadron->Ge 490 &RightMom, RightHadron->GetPDGMass(), ResidualMass);
721 LeftMom.boost(ClusterVel); 491 LeftMom.boost(ClusterVel);
722 RightMom.boost(ClusterVel); 492 RightMom.boost(ClusterVel);
723 493
724 #ifdef debug_QGSMfragmentation << 494 #ifdef debug_QGSMfragmentation // Uzhi Oct. 2014
725 G4cout<<LeftHadron->GetParticleName()<<" " << 495 G4cout<<LeftHadron->GetParticleName()<<" "<<RightHadron->GetParticleName()<<G4endl;
726 G4cout<<"Left Hadrom P M "<<LeftMom<<" "< << 496 G4cout<<"Left Hadrom P M "<<LeftMom<<" "<<LeftMom.mag()<<G4endl;
727 G4cout<<"Right Hadrom P M "<<RightMom<<" " << 497 G4cout<<"Right Hadrom P M "<<RightMom<<" "<<RightMom.mag()<<G4endl;
728 #endif << 498 #endif
729 499
730 LeftVector->push_back(new G4KineticTrack(L 500 LeftVector->push_back(new G4KineticTrack(LeftHadron, 0, Pos, LeftMom));
731 RightVector->push_back(new G4KineticTrack( 501 RightVector->push_back(new G4KineticTrack(RightHadron, 0, Pos, RightMom));
732 502
733 return true; 503 return true;
>> 504
734 } 505 }
735 506
736 //-------------------------------------------- 507 //----------------------------------------------------------------------------------------------------------
737 508
738 void G4QGSMFragmentation::Sample4Momentum(G4Lo << 509 G4bool G4QGSMFragmentation::IsFragmentable(const G4FragmentingString * const string)
739 G4Lo << 510 {
>> 511 return sqr(FragmentationMass(string)+MassCut) <
>> 512 string->Mass2();
>> 513 }
>> 514
>> 515 //----------------------------------------------------------------------------------------------------------
>> 516
>> 517 G4bool G4QGSMFragmentation::StopFragmenting(const G4FragmentingString * const string)
740 { 518 {
741 #ifdef debug_QGSMfragmentation << 519 return
742 G4cout<<"Sample4Momentum Last------------- << 520 sqr(FragmentationMass(string,&G4HadronBuilder::BuildHighSpin)+MassCut) >
743 G4cout<<" StrMass "<<InitialMass<<" Mass1 << 521 string->Get4Momentum().mag2();
744 G4cout<<" SumMass "<<Mass+AntiMass<<G4end << 522 }
745 #endif << 523
>> 524 //----------------------------------------------------------------------------------------------------------
>> 525
>> 526 //----------------------------------------------------------------------------------------------------------
746 527
>> 528 void G4QGSMFragmentation::Sample4Momentum(G4LorentzVector* Mom , G4double Mass ,
>> 529 G4LorentzVector* AntiMom, G4double AntiMass, G4double InitialMass)
>> 530 {
747 G4double r_val = sqr(InitialMass*InitialMa 531 G4double r_val = sqr(InitialMass*InitialMass - Mass*Mass - AntiMass*AntiMass) - sqr(2.*Mass*AntiMass);
748 G4double Pabs = (r_val > 0.)? std::sqrt(r_ 532 G4double Pabs = (r_val > 0.)? std::sqrt(r_val)/(2.*InitialMass) : 0;
749 533
750 //... sample unit vector 534 //... sample unit vector
751 G4double pz = 1. - 2.*G4UniformRand(); 535 G4double pz = 1. - 2.*G4UniformRand();
752 G4double st = std::sqrt(1. - pz * pz)* 536 G4double st = std::sqrt(1. - pz * pz)*Pabs;
753 G4double phi = 2.*pi*G4UniformRand(); 537 G4double phi = 2.*pi*G4UniformRand();
754 G4double px = st*std::cos(phi); 538 G4double px = st*std::cos(phi);
755 G4double py = st*std::sin(phi); 539 G4double py = st*std::sin(phi);
756 pz *= Pabs; 540 pz *= Pabs;
757 541
758 Mom->setPx(px); Mom->setPy(py); Mom->setPz 542 Mom->setPx(px); Mom->setPy(py); Mom->setPz(pz);
759 Mom->setE(std::sqrt(Pabs*Pabs + Mass*Mass) 543 Mom->setE(std::sqrt(Pabs*Pabs + Mass*Mass));
760 544
761 AntiMom->setPx(-px); AntiMom->setPy(-py); 545 AntiMom->setPx(-px); AntiMom->setPy(-py); AntiMom->setPz(-pz);
762 AntiMom->setE (std::sqrt(Pabs*Pabs + AntiM 546 AntiMom->setE (std::sqrt(Pabs*Pabs + AntiMass*AntiMass));
763 } << 547 }
764 548
765 //-------------------------------------------- << 549
>> 550 //*********************************************************************************************
>> 551 // Uzhi June 2014 Insert from G4ExcitedStringDecay.cc
>> 552 //-----------------------------------------------------------------------------
766 553
767 void G4QGSMFragmentation::SetFFq2q() // q-> q << 554 G4ParticleDefinition *G4QGSMFragmentation::DiQuarkSplitup(
>> 555 G4ParticleDefinition* decay,
>> 556 G4ParticleDefinition *&created)
768 { 557 {
769 for (G4int i=0; i < 5; i++) { << 558 //... can Diquark break or not?
770 FFq2q[i][0][0] = 2.0 ; FFq2q[i][0][1] = -a << 559 if (G4UniformRand() < DiquarkBreakProb ){
771 FFq2q[i][1][0] = 2.0 ; FFq2q[i][1][1] = -a << 560 //... Diquark break
772 FFq2q[i][2][0] = 1.0 ; FFq2q[i][2][1] = -a <<
773 FFq2q[i][3][0] = 1.0 ; FFq2q[i][3][1] = -a <<
774 FFq2q[i][4][0] = 1.0 ; FFq2q[i][4][1] = -a <<
775 } <<
776 } <<
777 561
778 //-------------------------------------------- << 562 G4int stableQuarkEncoding = decay->GetPDGEncoding()/1000;
>> 563 G4int decayQuarkEncoding = (decay->GetPDGEncoding()/100)%10;
779 564
780 void G4QGSMFragmentation::SetFFq2qq() // q-> << 565 if (G4UniformRand() < 0.5)
781 { << 566 {
782 for (G4int i=0; i < 5; i++) { << 567 G4int Swap = stableQuarkEncoding;
783 FFq2qq[i][ 0][0] = 0.0 ; FFq2qq[i][ 0][1] << 568 stableQuarkEncoding = decayQuarkEncoding;
784 FFq2qq[i][ 1][0] = 0.0 ; FFq2qq[i][ 1][1] << 569 decayQuarkEncoding = Swap;
785 FFq2qq[i][ 2][0] = 0.0 ; FFq2qq[i][ 2][1] << 570 }
786 FFq2qq[i][ 3][0] = 0.0 ; FFq2qq[i][ 3][1] <<
787 FFq2qq[i][ 4][0] = 0.0 ; FFq2qq[i][ 4][1] <<
788 FFq2qq[i][ 5][0] = 0.0 ; FFq2qq[i][ 5][1] <<
789 FFq2qq[i][ 6][0] = 0.0 ; FFq2qq[i][ 6][1] <<
790 FFq2qq[i][ 7][0] = 0.0 ; FFq2qq[i][ 7][1] <<
791 FFq2qq[i][ 8][0] = 0.0 ; FFq2qq[i][ 8][1] <<
792 FFq2qq[i][ 9][0] = 0.0 ; FFq2qq[i][ 9][1] <<
793 FFq2qq[i][10][0] = 0.0 ; FFq2qq[i][10][1] <<
794 FFq2qq[i][11][0] = 0.0 ; FFq2qq[i][11][1] <<
795 FFq2qq[i][12][0] = 0.0 ; FFq2qq[i][12][1] <<
796 FFq2qq[i][13][0] = 0.0 ; FFq2qq[i][13][1] <<
797 FFq2qq[i][14][0] = 0.0 ; FFq2qq[i][14][1] <<
798 } <<
799 } <<
800 571
801 //-------------------------------------------- << 572 G4int IsParticle=(decayQuarkEncoding>0) ? -1 : +1;
>> 573 // if we have a quark, we need antiquark)
802 574
803 void G4QGSMFragmentation::SetFFqq2q() // q1q2 << 575 G4double StrSup=GetStrangeSuppress(); // for changing s-sbar production, Uzhi Oct. 2014
804 { << 576 StrangeSuppress=0.41; // was 0.47
805 for (G4int i=0; i < 15; i++) { << 577 pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted
806 FFqq2q[i][0][0] = 2.0*(arho - an); FFqq2q[ << 578 StrangeSuppress=StrSup;
807 FFqq2q[i][1][0] = 2.0*(arho - an); FFqq2q[ <<
808 FFqq2q[i][2][0] = 2.0*(arho - an); FFqq2q[ <<
809 FFqq2q[i][3][0] = 2.0*(arho - an); FFqq2q[ <<
810 FFqq2q[i][4][0] = 2.0*(arho - an); FFqq2q[ <<
811 } <<
812 } <<
813 579
814 //-------------------------------------------- << 580 //... Build new Diquark
>> 581 G4int QuarkEncoding=QuarkPair.second->GetPDGEncoding();
>> 582 G4int i10 = std::max(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding));
>> 583 G4int i20 = std::min(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding));
>> 584 G4int spin = (i10 != i20 && G4UniformRand() <= 0.5)? 1 : 3;
>> 585 G4int NewDecayEncoding = -1*IsParticle*(i10 * 1000 + i20 * 100 + spin);
>> 586 created = FindParticle(NewDecayEncoding);
>> 587 G4ParticleDefinition * decayQuark=FindParticle(decayQuarkEncoding);
>> 588 G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decayQuark);
815 589
816 void G4QGSMFragmentation::SetFFqq2qq() // q1( << 590 return had;
817 { << 591 // return hadronizer->Build(QuarkPair.first, decayQuark);
818 for (G4int i=0; i < 15; i++) { << 592
819 FFqq2qq[i][0][0] = 0. ; FFqq2qq[i][0][1] << 593 } else {
820 FFqq2qq[i][1][0] = 0. ; FFqq2qq[i][1][1] << 594 //... Diquark does not break
821 FFqq2qq[i][2][0] = 0. ; FFqq2qq[i][2][1] << 595
822 FFqq2qq[i][3][0] = 0. ; FFqq2qq[i][3][1] << 596 G4int IsParticle=(decay->GetPDGEncoding()>0) ? +1 : -1;
823 FFqq2qq[i][4][0] = 0. ; FFqq2qq[i][4][1] << 597 // if we have a diquark, we need quark)
824 } << 598 G4double StrSup=GetStrangeSuppress(); // for changing s-sbar production, Uzhi Oct. 2014
>> 599 StrangeSuppress=0.41; //0.41; 0.47
>> 600 pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted
>> 601 StrangeSuppress=StrSup;
>> 602
>> 603 created = QuarkPair.second;
>> 604
>> 605 G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decay);
>> 606 return had;
>> 607 // return G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decay);
>> 608 }
825 } 609 }
>> 610 // Uzhi June 2014 End of the inserting
826 611
827 612