| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 //
28 // -----------------------------------------------------------------------------
29 // GEANT 4 class implementation file
30 //
31 // History: first implementation, Maxim Komogorov, 1-Jul-1998
32 // redesign Gunter Folger, August/September 2001
33 // -----------------------------------------------------------------------------
34 #include "G4VLongitudinalStringDecay.hh"
35 #include "G4PhysicalConstants.hh"
36 #include "G4SystemOfUnits.hh"
37 #include "G4ios.hh"
38 #include "Randomize.hh"
39 #include "G4FragmentingString.hh"
40
41 #include "G4ParticleDefinition.hh"
42 #include "G4ParticleTypes.hh"
43 #include "G4ParticleChange.hh"
44 #include "G4VShortLivedParticle.hh"
45 #include "G4ShortLivedConstructor.hh"
46 #include "G4ParticleTable.hh"
47 #include "G4PhaseSpaceDecayChannel.hh"
48 #include "G4VDecayChannel.hh"
49 #include "G4DecayTable.hh"
50
51 #include "G4DiQuarks.hh"
52 #include "G4Quarks.hh"
53 #include "G4Gluons.hh"
54
55 #include "G4Exp.hh"
56 #include "G4Log.hh"
57
58 #include "G4HadronicException.hh"
59
60 //------------------------debug switches
61 //#define debug_VStringDecay
62 //#define debug_heavyHadrons
63
64 //******************************************************************************
65 // Constructors
66
67 G4VLongitudinalStringDecay::G4VLongitudinalStringDecay(const G4String& name)
68 : G4HadronicInteraction(name), ProbCCbar(0.0), ProbBBbar(0.0)
69 {
70 MassCut = 210.0*MeV; // Mpi + Delta
71
72 StringLoopInterrupt = 1000;
73 ClusterLoopInterrupt = 500;
74
75 // Changable Parameters below.
76 SigmaQT = 0.5 * GeV;
77
78 StrangeSuppress = 0.44; // =0.27/2.27 suppression of strange quark pair production, ie. u:d:s=1:1:0.27
79 DiquarkSuppress = 0.07; // Probability of qq-qqbar pair production
80 DiquarkBreakProb = 0.1; // Probability of (qq)->h+(qq)'
81
82 //... pspin_meson is probability to create pseudo-scalar meson
83 pspin_meson.resize(3);
84 pspin_meson[0] = 0.5; // u or d + anti-u or anti-d
85 pspin_meson[1] = 0.4; // one of the quark is strange, or charm, or bottom
86 pspin_meson[2] = 0.3; // both of the quark are strange, or charm, or bottom
87
88 //... pspin_barion is probability to create 1/2 barion
89 pspin_barion = 0.5;
90
91 //... vectorMesonMix[] is quark mixing parameters for vector mesons (Variable spin = 3)
92 vectorMesonMix.resize(6);
93 vectorMesonMix[0] = 0.0;
94 vectorMesonMix[1] = 0.5;
95 vectorMesonMix[2] = 0.0;
96 vectorMesonMix[3] = 0.5;
97 vectorMesonMix[4] = 1.0;
98 vectorMesonMix[5] = 1.0;
99
100 //... scalarMesonMix[] is quark mixing parameters for scalar mesons (Variable spin=1)
101 scalarMesonMix.resize(6);
102 scalarMesonMix[0] = 0.5;
103 scalarMesonMix[1] = 0.25;
104 scalarMesonMix[2] = 0.5;
105 scalarMesonMix[3] = 0.25;
106 scalarMesonMix[4] = 1.0;
107 scalarMesonMix[5] = 0.5;
108
109 SetProbCCbar(0.0); // Probability of CCbar pair creation
110 SetProbEta_c(0.1); // Mixing of Eta_c and J/Psi
111 SetProbBBbar(0.0); // Probability of BBbar pair creation
112 SetProbEta_b(0.0); // Mixing of Eta_b and Upsilon_b
113
114 // Parameters may be changed until the first fragmentation starts
115 PastInitPhase=false;
116 hadronizer = new G4HadronBuilder( pspin_meson, pspin_barion, scalarMesonMix, vectorMesonMix,
117 ProbEta_c, ProbEta_b );
118
119 MaxMass=-350.0*GeV; // If there will be a particle with mass larger than Higgs the value must be changed.
120
121 SetMinMasses(); // Re-calculation of minimal mass of strings and weights of particles in 2-part. decays
122
123 Kappa = 1.0 * GeV/fermi;
124 DecayQuark = NewQuark = 0;
125 }
126
127 G4VLongitudinalStringDecay::~G4VLongitudinalStringDecay()
128 {
129 delete hadronizer;
130 }
131
132 G4HadFinalState*
133 G4VLongitudinalStringDecay::ApplyYourself(const G4HadProjectile&, G4Nucleus&)
134 {
135 return nullptr;
136 }
137
138 //=============================================================================
139
140 // For changing Mass Cut used for selection of very small mass strings
141 void G4VLongitudinalStringDecay::SetMassCut(G4double aValue){ MassCut=aValue; }
142 G4double G4VLongitudinalStringDecay::GetMassCut() { return MassCut; }
143
144 //-----------------------------------------------------------------------------
145
146 // For handling a string with very low mass
147
148 G4KineticTrackVector* G4VLongitudinalStringDecay::ProduceOneHadron(const G4ExcitedString * const string)
149 {
150 G4KineticTrackVector* result = nullptr;
151 pDefPair hadrons( nullptr, nullptr );
152 G4FragmentingString aString( *string );
153
154 #ifdef debug_VStringDecay
155 G4cout<<"G4VLongitudinalStringDecay::ProduceOneHadron: PossibleHmass StrMass "
156 <<aString.Mass()<<" MassCut "<<MassCut<<G4endl;
157 #endif
158
159 SetMinimalStringMass( &aString );
160 PossibleHadronMass( &aString, 0, &hadrons );
161 result = new G4KineticTrackVector;
162 if ( hadrons.first != nullptr ) {
163 if ( hadrons.second == nullptr ) {
164 // Substitute string by light hadron, Note that Energy is not conserved here!
165
166 #ifdef debug_VStringDecay
167 G4cout << "VlongSD Warning replacing string by single hadron (G4VLongitudinalStringDecay)" <<G4endl;
168 G4cout << hadrons.first->GetParticleName()<<G4endl
169 << "string .. " << string->Get4Momentum() << " "
170 << string->Get4Momentum().m() << G4endl;
171 #endif
172
173 G4ThreeVector Mom3 = string->Get4Momentum().vect();
174 G4LorentzVector Mom( Mom3, std::sqrt( Mom3.mag2() + sqr( hadrons.first->GetPDGMass() ) ) );
175 result->push_back( new G4KineticTrack( hadrons.first, 0, string->GetPosition(), Mom ) );
176 } else {
177 //... string was qq--qqbar type: Build two stable hadrons,
178
179 #ifdef debug_VStringDecay
180 G4cout << "VlongSD Warning replacing qq-qqbar string by TWO hadrons (G4VLongitudinalStringDecay)"
181 << hadrons.first->GetParticleName() << " / "
182 << hadrons.second->GetParticleName()
183 << "string .. " << string->Get4Momentum() << " "
184 << string->Get4Momentum().m() << G4endl;
185 #endif
186
187 G4LorentzVector Mom1, Mom2;
188 Sample4Momentum( &Mom1, hadrons.first->GetPDGMass(),
189 &Mom2, hadrons.second->GetPDGMass(),
190 string->Get4Momentum().mag() );
191
192 result->push_back( new G4KineticTrack( hadrons.first, 0, string->GetPosition(), Mom1 ) );
193 result->push_back( new G4KineticTrack( hadrons.second, 0, string->GetPosition(), Mom2 ) );
194
195 G4ThreeVector Velocity = string->Get4Momentum().boostVector();
196 result->Boost(Velocity);
197 }
198 }
199 return result;
200 }
201
202 //----------------------------------------------------------------------------------------
203
204 G4double G4VLongitudinalStringDecay::PossibleHadronMass( const G4FragmentingString * const string,
205 Pcreate build, pDefPair * pdefs )
206 {
207 G4double mass = 0.0;
208
209 if ( build==0 ) build=&G4HadronBuilder::BuildLowSpin;
210
211 G4ParticleDefinition* Hadron1 = nullptr;
212 G4ParticleDefinition* Hadron2 = nullptr;
213
214 if (!string->IsAFourQuarkString() )
215 {
216 // spin 0 meson or spin 1/2 barion will be built
217
218 Hadron1 = (hadronizer->*build)(string->GetLeftParton(), string->GetRightParton());
219 #ifdef debug_VStringDecay
220 G4cout<<"VlongSD PossibleHadronMass"<<G4endl;
221 G4cout<<"VlongSD Quarks at the string ends "<<string->GetLeftParton()->GetParticleName()
222 <<" "<<string->GetRightParton()->GetParticleName()<<G4endl;
223 if ( Hadron1 != nullptr) {
224 G4cout<<"(G4VLongitudinalStringDecay) Hadron "<<Hadron1->GetParticleName()
225 <<" "<<Hadron1->GetPDGMass()<<G4endl;
226 }
227 #endif
228 if ( Hadron1 != nullptr) { mass = (Hadron1)->GetPDGMass();}
229 else { mass = MaxMass;}
230 } else
231 {
232 //... string is qq--qqbar: Build two stable hadrons,
233
234 #ifdef debug_VStringDecay
235 G4cout<<"VlongSD PossibleHadronMass"<<G4endl;
236 G4cout<<"VlongSD string is qq--qqbar: Build two stable hadrons"<<G4endl;
237 #endif
238
239 G4double StringMass = string->Mass();
240 G4int cClusterInterrupt = 0;
241 do
242 {
243 if (cClusterInterrupt++ >= ClusterLoopInterrupt) return false;
244
245 G4int LeftQuark1= string->GetLeftParton()->GetPDGEncoding()/1000;
246 G4int LeftQuark2=(string->GetLeftParton()->GetPDGEncoding()/100)%10;
247
248 G4int RightQuark1= string->GetRightParton()->GetPDGEncoding()/1000;
249 G4int RightQuark2=(string->GetRightParton()->GetPDGEncoding()/100)%10;
250
251 if (G4UniformRand()<0.5) {
252 Hadron1 =hadronizer->Build(FindParticle(LeftQuark1), FindParticle(RightQuark1));
253 Hadron2 =hadronizer->Build(FindParticle(LeftQuark2), FindParticle(RightQuark2));
254 } else {
255 Hadron1 =hadronizer->Build(FindParticle(LeftQuark1), FindParticle(RightQuark2));
256 Hadron2 =hadronizer->Build(FindParticle(LeftQuark2), FindParticle(RightQuark1));
257 }
258 //... repeat procedure, if mass of cluster is too low to produce hadrons
259 //... ClusterMassCut = 0.15*GeV model parameter
260 }
261 while ( Hadron1 == nullptr || Hadron2 == nullptr ||
262 ( StringMass <= Hadron1->GetPDGMass() + Hadron2->GetPDGMass() ) );
263
264 mass = (Hadron1)->GetPDGMass() + (Hadron2)->GetPDGMass();
265 }
266
267 #ifdef debug_VStringDecay
268 G4cout<<"VlongSD *Hadrons 1 and 2, proposed mass "<<Hadron1<<" "<<Hadron2<<" "<<mass<<G4endl;
269 #endif
270
271 if ( pdefs != 0 )
272 { // need to return hadrons as well....
273 pdefs->first = Hadron1;
274 pdefs->second = Hadron2;
275 }
276
277 return mass;
278 }
279
280 //----------------------------------------------------------------------------
281
282 G4ParticleDefinition* G4VLongitudinalStringDecay::FindParticle(G4int Encoding)
283 {
284 /*
285 G4cout<<Encoding<<" G4VLongitudinalStringDecay::FindParticle Check di-quarks *******************"<<G4endl;
286 for (G4int i=4; i<6;i++){
287 for (G4int j=1;j<6;j++){
288 G4cout<<i<<" "<<j<<" ";
289 G4int Code = 1000 * i + 100 * j +1;
290 G4ParticleDefinition* ptr1 = G4ParticleTable::GetParticleTable()->FindParticle(Code);
291 Code +=2;
292 G4ParticleDefinition* ptr2 = G4ParticleTable::GetParticleTable()->FindParticle(Code);
293 G4cout<<"Code "<<Code - 2<<" ptr "<<ptr1<<" :: Code "<<Code<<" ptr "<<ptr2<<G4endl;
294 }
295 G4cout<<G4endl;
296 }
297 */
298
299 G4ParticleDefinition* ptr = G4ParticleTable::GetParticleTable()->FindParticle(Encoding);
300
301 if (ptr == nullptr)
302 {
303 for (size_t i=0; i < NewParticles.size(); i++)
304 {
305 if ( Encoding == NewParticles[i]->GetPDGEncoding() ) { ptr = NewParticles[i]; return ptr;}
306 }
307 }
308
309 return ptr;
310 }
311
312 //*********************************************************************************
313 // For decision on continue or stop string fragmentation
314 // virtual G4bool StopFragmenting(const G4FragmentingString * const string)=0;
315 // virtual G4bool IsItFragmentable(const G4FragmentingString * const string)=0;
316 //
317 // If a string can not fragment, make last break into 2 hadrons
318 // virtual G4bool SplitLast(G4FragmentingString * string,
319 // G4KineticTrackVector * LeftVector,
320 // G4KineticTrackVector * RightVector)=0;
321 //-----------------------------------------------------------------------------
322 //
323 // If a string can fragment, do the following
324 //
325 // For transver of a string to its CMS frame
326 //-----------------------------------------------------------------------------
327
328 G4ExcitedString *G4VLongitudinalStringDecay::CopyExcited(const G4ExcitedString & in)
329 {
330 G4Parton *Left=new G4Parton(*in.GetLeftParton());
331 G4Parton *Right=new G4Parton(*in.GetRightParton());
332 return new G4ExcitedString(Left,Right,in.GetDirection());
333 }
334
335 //-----------------------------------------------------------------------------
336
337 G4ParticleDefinition * G4VLongitudinalStringDecay::QuarkSplitup( G4ParticleDefinition* decay,
338 G4ParticleDefinition *&created )
339 {
340 #ifdef debug_VStringDecay
341 G4cout<<"VlongSD QuarkSplitup: quark ID "<<decay->GetPDGEncoding()<<G4endl;
342 #endif
343
344 G4int IsParticle=(decay->GetPDGEncoding()>0) ? -1 : +1; // if we have a quark, we need antiquark (or diquark)
345
346 pDefPair QuarkPair = CreatePartonPair(IsParticle);
347 created = QuarkPair.second;
348
349 DecayQuark = decay->GetPDGEncoding();
350 NewQuark = created->GetPDGEncoding();
351
352 #ifdef debug_VStringDecay
353 G4cout<<"VlongSD QuarkSplitup: "<<decay->GetPDGEncoding()<<" -> "<<QuarkPair.second->GetPDGEncoding()<<G4endl;
354 G4cout<<"hadronizer->Build(QuarkPair.first, decay)"<<G4endl;
355 #endif
356
357 return hadronizer->Build(QuarkPair.first, decay);
358 }
359
360 //-----------------------------------------------------------------------------
361
362 G4VLongitudinalStringDecay::pDefPair G4VLongitudinalStringDecay::
363 CreatePartonPair(G4int NeedParticle,G4bool AllowDiquarks)
364 {
365 // NeedParticle = +1 for Particle, -1 for Antiparticle
366 if ( AllowDiquarks && G4UniformRand() < DiquarkSuppress )
367 {
368 // Create a Diquark - AntiDiquark pair , first in pair is anti to IsParticle
369 #ifdef debug_VStringDecay
370 G4cout<<"VlongSD Create a Diquark - AntiDiquark pair"<<G4endl;
371 #endif
372 G4int q1(0), q2(0), spin(0), PDGcode(0);
373
374 q1 = SampleQuarkFlavor();
375 q2 = SampleQuarkFlavor();
376
377 spin = (q1 != q2 && G4UniformRand() <= 0.5)? 1 : 3;
378 // convention: quark with higher PDG number is first
379 PDGcode = (std::max(q1,q2) * 1000 + std::min(q1,q2) * 100 + spin) * NeedParticle;
380
381 return pDefPair (FindParticle(-PDGcode),FindParticle(PDGcode));
382
383 } else {
384 // Create a Quark - AntiQuark pair, first in pair IsParticle
385 #ifdef debug_VStringDecay
386 G4cout<<"VlongSD Create a Quark - AntiQuark pair"<<G4endl;
387 #endif
388 G4int PDGcode=SampleQuarkFlavor()*NeedParticle;
389 return pDefPair (FindParticle(PDGcode),FindParticle(-PDGcode));
390 }
391 }
392
393 //-----------------------------------------------------------------------------
394
395 G4int G4VLongitudinalStringDecay::SampleQuarkFlavor(void)
396 {
397 G4int quark(1);
398 G4double ksi = G4UniformRand();
399 if ( ksi < ProbCB ) {
400 if ( ksi < ProbCCbar ) {quark = 4;} // c quark
401 else {quark = 5;} // b quark
402 #ifdef debug_heavyHadrons
403 G4cout << "G4VLongitudinalStringDecay::SampleQuarkFlavor : sampled from the vacuum HEAVY quark = "
404 << quark << G4endl;
405 #endif
406 } else {
407 quark = 1 + (int)(G4UniformRand()/StrangeSuppress);
408 }
409 #ifdef debug_VStringDecay
410 G4cout<<"VlongSD SampleQuarkFlavor "<<quark<<" (ProbCB ProbCCbar ProbBBbar "<<ProbCB
411 <<" "<<ProbCCbar<<" "<<ProbBBbar<<" )"<<G4endl;
412 #endif
413 return quark;
414 }
415
416 //-----------------------------------------------------------------------------
417
418 G4ThreeVector G4VLongitudinalStringDecay::SampleQuarkPt(G4double ptMax)
419 {
420 G4double Pt;
421 if ( ptMax < 0 ) {
422 // sample full gaussian
423 Pt = -G4Log(G4UniformRand());
424 } else {
425 // sample in limited range
426 G4double q = ptMax/SigmaQT;
427 G4double ymin = (q > 20.) ? 0.0 : G4Exp(-q*q);
428 Pt = -G4Log(G4RandFlat::shoot(ymin, 1.));
429 }
430 Pt = SigmaQT * std::sqrt(Pt);
431 G4double phi = 2.*pi*G4UniformRand();
432 return G4ThreeVector(Pt * std::cos(phi),Pt * std::sin(phi),0);
433 }
434
435 //******************************************************************************
436
437 void G4VLongitudinalStringDecay::CalculateHadronTimePosition(G4double theInitialStringMass,
438 G4KineticTrackVector* Hadrons)
439 {
440 // `yo-yo` formation time
441 // const G4double kappa = 1.0 * GeV/fermi/4.;
442 G4double kappa = GetStringTensionParameter();
443 for (size_t c1 = 0; c1 < Hadrons->size(); c1++)
444 {
445 G4double SumPz = 0;
446 G4double SumE = 0;
447 for (size_t c2 = 0; c2 < c1; c2++)
448 {
449 SumPz += Hadrons->operator[](c2)->Get4Momentum().pz();
450 SumE += Hadrons->operator[](c2)->Get4Momentum().e();
451 }
452 G4double HadronE = Hadrons->operator[](c1)->Get4Momentum().e();
453 G4double HadronPz = Hadrons->operator[](c1)->Get4Momentum().pz();
454 Hadrons->operator[](c1)->SetFormationTime(
455 (theInitialStringMass - 2.*SumPz + HadronE - HadronPz ) / (2.*kappa) / c_light );
456 G4ThreeVector aPosition( 0, 0,
457 (theInitialStringMass - 2.*SumE - HadronE + HadronPz) / (2.*kappa) );
458 Hadrons->operator[](c1)->SetPosition(aPosition);
459 }
460 }
461
462 //-----------------------------------------------------------------------------
463
464 void G4VLongitudinalStringDecay::SetSigmaTransverseMomentum(G4double aValue)
465 {
466 if ( PastInitPhase ) {
467 throw G4HadronicException(__FILE__, __LINE__,
468 "G4VLongitudinalStringDecay::SetSigmaTransverseMomentum after FragmentString() not allowed");
469 } else {
470 SigmaQT = aValue;
471 }
472 }
473
474 //----------------------------------------------------------------------------------------------------------
475
476 void G4VLongitudinalStringDecay::SetStrangenessSuppression(G4double aValue)
477 {
478 StrangeSuppress = aValue;
479 }
480
481 //----------------------------------------------------------------------------------------------------------
482
483 void G4VLongitudinalStringDecay::SetDiquarkSuppression(G4double aValue)
484 {
485 DiquarkSuppress = aValue;
486 }
487
488 //----------------------------------------------------------------------------------------
489
490 void G4VLongitudinalStringDecay::SetDiquarkBreakProbability(G4double aValue)
491 {
492 if ( PastInitPhase ) {
493 throw G4HadronicException(__FILE__, __LINE__,
494 "G4VLongitudinalStringDecay::SetDiquarkBreakProbability after FragmentString() not allowed");
495 } else {
496 DiquarkBreakProb = aValue;
497 }
498 }
499
500 //----------------------------------------------------------------------------------------------------------
501
502 void G4VLongitudinalStringDecay::SetSpinThreeHalfBarionProbability(G4double aValue)
503 {
504 if ( PastInitPhase ) {
505 throw G4HadronicException(__FILE__, __LINE__,
506 "G4VLongitudinalStringDecay::SetSpinThreeHalfBarionProbability after FragmentString() not allowed");
507 } else {
508 pspin_barion = aValue;
509 delete hadronizer;
510 hadronizer = new G4HadronBuilder( pspin_meson, pspin_barion, scalarMesonMix, vectorMesonMix,
511 ProbEta_c, ProbEta_b );
512 }
513 }
514
515 //----------------------------------------------------------------------------------------------------------
516
517 void G4VLongitudinalStringDecay::SetScalarMesonMixings(std::vector<G4double> aVector)
518 {
519 if ( PastInitPhase ) {
520 throw G4HadronicException(__FILE__, __LINE__,
521 "G4VLongitudinalStringDecay::SetScalarMesonMixings after FragmentString() not allowed");
522 } else {
523 if ( aVector.size() < 6 )
524 throw G4HadronicException(__FILE__, __LINE__,
525 "G4VLongitudinalStringDecay::SetScalarMesonMixings( argument Vector too small");
526 scalarMesonMix[0] = aVector[0];
527 scalarMesonMix[1] = aVector[1];
528 scalarMesonMix[2] = aVector[2];
529 scalarMesonMix[3] = aVector[3];
530 scalarMesonMix[4] = aVector[4];
531 scalarMesonMix[5] = aVector[5];
532 delete hadronizer;
533 hadronizer = new G4HadronBuilder( pspin_meson, pspin_barion, scalarMesonMix, vectorMesonMix,
534 ProbEta_c, ProbEta_b );
535 }
536 }
537
538 //----------------------------------------------------------------------------------------------------------
539
540 void G4VLongitudinalStringDecay::SetVectorMesonMixings(std::vector<G4double> aVector)
541 {
542 if ( PastInitPhase ) {
543 throw G4HadronicException(__FILE__, __LINE__,
544 "G4VLongitudinalStringDecay::SetVectorMesonMixings after FragmentString() not allowed");
545 } else {
546 if ( aVector.size() < 6 )
547 throw G4HadronicException(__FILE__, __LINE__,
548 "G4VLongitudinalStringDecay::SetVectorMesonMixings( argument Vector too small");
549 vectorMesonMix[0] = aVector[0];
550 vectorMesonMix[1] = aVector[1];
551 vectorMesonMix[2] = aVector[2];
552 vectorMesonMix[3] = aVector[3];
553 vectorMesonMix[4] = aVector[4];
554 vectorMesonMix[5] = aVector[5];
555 delete hadronizer;
556 hadronizer = new G4HadronBuilder( pspin_meson, pspin_barion, scalarMesonMix, vectorMesonMix,
557 ProbEta_c, ProbEta_b );
558 }
559 }
560
561 //-------------------------------------------------------------------------------------------
562
563 void G4VLongitudinalStringDecay::SetProbCCbar(G4double aValue)
564 {
565 ProbCCbar = aValue;
566 ProbCB = ProbCCbar + ProbBBbar;
567 }
568
569 //-------------------------------------------------------------------------------------------
570
571 void G4VLongitudinalStringDecay::SetProbEta_c(G4double aValue)
572 {
573 ProbEta_c = aValue;
574 }
575
576 //-------------------------------------------------------------------------------------------
577
578 void G4VLongitudinalStringDecay::SetProbBBbar(G4double aValue)
579 {
580 ProbBBbar = aValue;
581 ProbCB = ProbCCbar + ProbBBbar;
582 }
583
584 //-------------------------------------------------------------------------------------------
585
586 void G4VLongitudinalStringDecay::SetProbEta_b(G4double aValue)
587 {
588 ProbEta_b = aValue;
589 }
590
591 //-------------------------------------------------------------------------------------------
592
593 void G4VLongitudinalStringDecay::SetStringTensionParameter(G4double aValue)
594 {
595 Kappa = aValue * GeV/fermi;
596 }
597
598 //-----------------------------------------------------------------------
599
600 void G4VLongitudinalStringDecay::SetMinMasses()
601 {
602 // ------ For estimation of a minimal string mass ---------------
603 Mass_of_light_quark =140.*MeV;
604 Mass_of_s_quark =500.*MeV;
605 Mass_of_c_quark =1600.*MeV;
606 Mass_of_b_quark =4500.*MeV;
607 Mass_of_string_junction=720.*MeV;
608
609 // ---------------- Determination of minimal mass of q-qbar strings -------------------
610 G4ParticleDefinition * hadron1; G4int Code1;
611 G4ParticleDefinition * hadron2; G4int Code2;
612 for (G4int i=1; i < 6; i++) {
613 Code1 = 100*i + 10*1 + 1;
614 hadron1 = FindParticle(Code1);
615
616 if (hadron1 != nullptr) {
617 for (G4int j=1; j < 6; j++) {
618 Code2 = 100*j + 10*1 + 1;
619 hadron2 = FindParticle(Code2);
620 if (hadron2 != nullptr) {
621 minMassQQbarStr[i-1][j-1] = hadron1->GetPDGMass() + hadron2->GetPDGMass() + 70.0 * MeV;
622 }
623 }
624 }
625 }
626
627 minMassQQbarStr[1][1] = minMassQQbarStr[0][0]; // u-ubar = 0.5 Pi0 + 0.24 Eta + 0.25 Eta'
628
629 // ---------------- Determination of minimal mass of qq-q strings -------------------
630 G4ParticleDefinition * hadron3;
631 G4int kfla, kflb;
632 // MaxMass = -350.0*GeV; // If there will be a particle with mass larger than Higgs the value must be changed.
633
634 for (G4int i=1; i < 6; i++) { //i=1
635 Code1 = 100*i + 10*1 + 1;
636 hadron1 = FindParticle(Code1);
637 for (G4int j=1; j < 6; j++) {
638 for (G4int k=1; k < 6; k++) {
639 kfla = std::max(j,k);
640 kflb = std::min(j,k);
641
642 // Add d-quark
643 Code2 = 1000*kfla + 100*kflb + 10*1 + 2;
644 if ( (j == 1) && (k==1)) Code2 = 1000*2 + 100*1 + 10*1 + 2; // In the case - add u-quark.
645
646 hadron2 = G4ParticleTable::GetParticleTable()->FindParticle(Code2);
647 hadron3 = G4ParticleTable::GetParticleTable()->FindParticle(Code2 + 2);
648
649 if ((hadron2 == nullptr) && (hadron3 == nullptr)) {minMassQDiQStr[i-1][j-1][k-1] = MaxMass; continue;};
650
651 if ((hadron2 != nullptr) && (hadron3 != nullptr)) {
652 if (hadron2->GetPDGMass() > hadron3->GetPDGMass() ) { hadron2 = hadron3; }
653 };
654
655 if ((hadron2 != nullptr) && (hadron3 == nullptr)) {};
656
657 if ((hadron2 == nullptr) && (hadron3 != nullptr)) {hadron2 = hadron3;};
658
659 minMassQDiQStr[i-1][j-1][k-1] = hadron1->GetPDGMass() + hadron2->GetPDGMass() + 70.0 * MeV;
660 }
661 }
662 }
663
664 // ------ An estimated minimal string mass ----------------------
665 MinimalStringMass = 0.;
666 MinimalStringMass2 = 0.;
667 // q charges d u s c b
668 Qcharge[0] = -1; Qcharge[1] = 2; Qcharge[2] = -1; Qcharge[3] = 2; Qcharge[4] = -1;
669
670 // For treating of small string decays
671 for (G4int i=0; i<5; i++)
672 { for (G4int j=0; j<5; j++)
673 { for (G4int k=0; k<7; k++)
674 {
675 Meson[i][j][k]=0; MesonWeight[i][j][k]=0.;
676 }
677 }
678 }
679 //--------------------------
680 G4int StrangeQ = 0;
681 G4int StrangeAQ = 0;
682 for (G4int i=0; i<5; i++)
683 {
684 if( i >= 2 ) StrangeQ=1;
685 for (G4int j=0; j<5; j++)
686 {
687 StrangeAQ = 0;
688 if( j >= 2 ) StrangeAQ=1;
689 Meson[i][j][0] = 100 * (std::max(i,j)+1) + 10 * (std::min(i,j)+1) + 1; // Scalar meson
690 MesonWeight[i][j][0] = ( pspin_meson[StrangeQ + StrangeAQ]);
691 Meson[i][j][1] = 100 * (std::max(i,j)+1) + 10 * (std::min(i,j)+1) + 3; // Vector meson
692 MesonWeight[i][j][1] = (1.-pspin_meson[StrangeQ + StrangeAQ]);
693 }
694 }
695
696 //qqs indexes
697 //dd1 -> scalarMesonMix[0] * 111 + (1-scalarMesonMix[0]-scalarMesonMix[1]) * 221 + scalarMesonMix[1] * 331 (000)
698 //dd1 -> Pi0 Eta Eta'
699
700 Meson[0][0][0] = 111; MesonWeight[0][0][0] = ( pspin_meson[0]) * ( scalarMesonMix[0] ); // Pi0
701 Meson[0][0][2] = 221; MesonWeight[0][0][3] = ( pspin_meson[0]) * (1-scalarMesonMix[0]-scalarMesonMix[1]); // Eta
702 Meson[0][0][3] = 331; MesonWeight[0][0][4] = ( pspin_meson[0]) * ( scalarMesonMix[1]); // Eta'
703
704 //dd3 -> (1-vectorMesonMix[1] * 113 + vectorMesonMix[1] * 223 (001)
705 //dd3 -> rho_0 omega
706
707 Meson[0][0][1] = 113; MesonWeight[0][0][1] = (1.-pspin_meson[0]) * (1-vectorMesonMix[1]); // Rho
708 Meson[0][0][4] = 223; MesonWeight[0][0][4] = (1.-pspin_meson[0]) * ( vectorMesonMix[1]); // omega
709
710 //uu1 -> scalarMesonMix[0] * 111 + (1-scalarMesonMix[0]-scalarMesonMix[1]) * 221 + scalarMesonMix[1] * 331 (110)
711 //uu1 -> Pi0 Eta Eta'
712
713 Meson[1][1][0] = 111; MesonWeight[1][1][0] = ( pspin_meson[0]) * ( scalarMesonMix[0] ); // Pi0
714 Meson[1][1][2] = 221; MesonWeight[1][1][2] = ( pspin_meson[0]) * (1-scalarMesonMix[0]-scalarMesonMix[1]); // Eta
715 Meson[1][1][3] = 331; MesonWeight[1][1][3] = ( pspin_meson[0]) * ( scalarMesonMix[1]); // Eta'
716
717 //uu3 -> (1-vectorMesonMix[1]) * 113 + vectorMesonMix[1] * 223 (111)
718 //uu3 -> rho_0 omega
719
720 Meson[1][1][1] = 113; MesonWeight[1][1][1] = (1.-pspin_meson[0]) * (1-vectorMesonMix[1]); // Rho
721 Meson[1][1][4] = 223; MesonWeight[1][1][4] = (1.-pspin_meson[0]) * ( vectorMesonMix[1]); // omega
722
723 //ss1 -> (1-scalarMesonMix[5]) * 221 + scalarMesonMix[5] * 331 (220)
724 //ss1 -> Eta Eta'
725
726 Meson[2][2][0] = 221; MesonWeight[2][2][0] = ( pspin_meson[2]) * (1-scalarMesonMix[5] ); // Eta
727 Meson[2][2][2] = 331; MesonWeight[2][2][2] = ( pspin_meson[2]) * ( scalarMesonMix[5]); // Eta'
728
729 //ss3 -> vectorMesonMix[5] * 333 (221)
730 //ss3 -> phi
731
732 Meson[2][2][1] = 333; MesonWeight[2][2][1] = (1.-pspin_meson[2]) * ( vectorMesonMix[5]); // phi
733
734 //cc1 -> ProbEta_c /(1-pspin_meson) 441 (330) Probability of Eta_c
735 //cc3 -> (1-ProbEta_c)/( pspin_meson) 443 (331) Probability of J/Psi
736
737 //bb1 -> ProbEta_b /pspin_meson 551 (440) Probability of Eta_b
738 //bb3 -> (1-ProbEta_b)/pspin_meson 553 (441) Probability of Upsilon
739
740 if ( pspin_meson[2] != 0. ) {
741 Meson[3][3][0] *= ( ProbEta_c)/( pspin_meson[2]); // Eta_c
742 Meson[3][3][1] *= (1.0-ProbEta_c)/(1.-pspin_meson[2]); // J/Psi
743
744 Meson[4][4][0] *= ( ProbEta_b)/( pspin_meson[2]); // Eta_b
745 Meson[4][4][1] *= (1.0-ProbEta_b)/(1.-pspin_meson[2]); // Upsilon
746 }
747
748 //--------------------------
749
750 for (G4int i=0; i<5; i++)
751 { for (G4int j=0; j<5; j++)
752 { for (G4int k=0; k<5; k++)
753 { for (G4int l=0; l<4; l++)
754 { Baryon[i][j][k][l]=0; BaryonWeight[i][j][k][l]=0.;}
755 }
756 }
757 }
758
759 kfla =0; kflb =0;
760 G4int kflc(0), kfld(0), kfle(0), kflf(0);
761 for (G4int i=0; i<5; i++)
762 { for (G4int j=0; j<5; j++)
763 { for (G4int k=0; k<5; k++)
764 {
765 kfla = i+1; kflb = j+1; kflc = k+1;
766 kfld = std::max(kfla,kflb);
767 kfld = std::max(kfld,kflc);
768
769 kflf = std::min(kfla,kflb);
770 kflf = std::min(kflf,kflc);
771
772 kfle = kfla + kflb + kflc - kfld - kflf;
773
774 Baryon[i][j][k][0] = 1000 * kfld + 100 * kfle + 10 * kflf + 2; // spin=1/2
775 BaryonWeight[i][j][k][0] = ( pspin_barion);
776 Baryon[i][j][k][1] = 1000 * kfld + 100 * kfle + 10 * kflf + 4; // spin=3/2
777 BaryonWeight[i][j][k][1] = (1.-pspin_barion);
778 }
779 }
780 }
781
782 // Delta- ddd - only 1114
783 Baryon[0][0][0][0] = 1114; BaryonWeight[0][0][0][0] = 1.0;
784 Baryon[0][0][0][1] = 0; BaryonWeight[0][0][0][1] = 0.0;
785
786 // Delta++ uuu - only 2224
787 Baryon[1][1][1][0] = 2224; BaryonWeight[1][1][1][0] = 1.0;
788 Baryon[1][1][1][1] = 0; BaryonWeight[1][1][1][1] = 0.0;
789
790 // Omega- sss - only 3334
791 Baryon[2][2][2][0] = 3334; BaryonWeight[2][2][2][0] = 1.0;
792 Baryon[2][2][2][1] = 0; BaryonWeight[2][2][2][1] = 0.0;
793
794 // Omega_cc++ ccc - only 4444
795 Baryon[3][3][3][0] = 4444; BaryonWeight[3][3][3][0] = 1.0;
796 Baryon[3][3][3][1] = 0; BaryonWeight[3][3][3][1] = 0.0;
797
798 // Omega_bb- bbb - only 5554
799 Baryon[4][4][4][0] = 5554; BaryonWeight[4][4][4][0] = 1.0;
800 Baryon[4][4][4][1] = 0; BaryonWeight[4][4][4][1] = 0.0;
801
802 // Lambda/Sigma0 sud - 3122/3212
803 Baryon[0][1][2][0] = 3122; BaryonWeight[0][1][2][0] *= 0.5; // Lambda
804 Baryon[0][2][1][0] = 3122; BaryonWeight[0][2][1][0] *= 0.5;
805 Baryon[1][0][2][0] = 3122; BaryonWeight[1][0][2][0] *= 0.5;
806 Baryon[1][2][0][0] = 3122; BaryonWeight[1][2][0][0] *= 0.5;
807 Baryon[2][0][1][0] = 3122; BaryonWeight[2][0][1][0] *= 0.5;
808 Baryon[2][1][0][0] = 3122; BaryonWeight[2][1][0][0] *= 0.5;
809
810 Baryon[0][1][2][2] = 3212; BaryonWeight[0][1][2][2] = 0.5 * pspin_barion; // Sigma0
811 Baryon[0][2][1][2] = 3212; BaryonWeight[0][2][1][2] = 0.5 * pspin_barion;
812 Baryon[1][0][2][2] = 3212; BaryonWeight[1][0][2][2] = 0.5 * pspin_barion;
813 Baryon[1][2][0][2] = 3212; BaryonWeight[1][2][0][2] = 0.5 * pspin_barion;
814 Baryon[2][0][1][2] = 3212; BaryonWeight[2][0][1][2] = 0.5 * pspin_barion;
815 Baryon[2][1][0][2] = 3212; BaryonWeight[2][1][0][2] = 0.5 * pspin_barion;
816
817 // Lambda_c+/Sigma_c+ cud - 4122/4212
818 Baryon[0][1][3][0] = 4122; BaryonWeight[0][1][3][0] *= 0.5; // Lambda_c+
819 Baryon[0][3][1][0] = 4122; BaryonWeight[0][3][1][0] *= 0.5;
820 Baryon[1][0][3][0] = 4122; BaryonWeight[1][0][3][0] *= 0.5;
821 Baryon[1][3][0][0] = 4122; BaryonWeight[1][3][0][0] *= 0.5;
822 Baryon[3][0][1][0] = 4122; BaryonWeight[3][0][1][0] *= 0.5;
823 Baryon[3][1][0][0] = 4122; BaryonWeight[3][1][0][0] *= 0.5;
824
825 Baryon[0][1][3][2] = 4212; BaryonWeight[0][1][3][2] = 0.5 * pspin_barion; // SigmaC+
826 Baryon[0][3][1][2] = 4212; BaryonWeight[0][3][1][2] = 0.5 * pspin_barion;
827 Baryon[1][0][3][2] = 4212; BaryonWeight[1][0][3][2] = 0.5 * pspin_barion;
828 Baryon[1][3][0][2] = 4212; BaryonWeight[1][3][0][2] = 0.5 * pspin_barion;
829 Baryon[3][0][1][2] = 4212; BaryonWeight[3][0][1][2] = 0.5 * pspin_barion;
830 Baryon[3][1][0][2] = 4212; BaryonWeight[3][1][0][2] = 0.5 * pspin_barion;
831
832 // Xi_c+/Xi_c+' cus - 4232/4322
833 Baryon[1][2][3][0] = 4232; BaryonWeight[1][2][3][0] *= 0.5; // Xi_c+
834 Baryon[1][3][2][0] = 4232; BaryonWeight[1][3][2][0] *= 0.5;
835 Baryon[2][1][3][0] = 4232; BaryonWeight[2][1][3][0] *= 0.5;
836 Baryon[2][3][1][0] = 4232; BaryonWeight[2][3][1][0] *= 0.5;
837 Baryon[3][1][2][0] = 4232; BaryonWeight[3][1][2][0] *= 0.5;
838 Baryon[3][2][1][0] = 4232; BaryonWeight[3][2][1][0] *= 0.5;
839
840 Baryon[1][2][3][2] = 4322; BaryonWeight[1][2][3][2] = 0.5 * pspin_barion; // Xi_c+'
841 Baryon[1][3][2][2] = 4322; BaryonWeight[1][3][2][2] = 0.5 * pspin_barion;
842 Baryon[2][1][3][2] = 4322; BaryonWeight[2][1][3][2] = 0.5 * pspin_barion;
843 Baryon[2][3][1][2] = 4322; BaryonWeight[2][3][1][2] = 0.5 * pspin_barion;
844 Baryon[3][1][2][2] = 4322; BaryonWeight[3][1][2][2] = 0.5 * pspin_barion;
845 Baryon[3][2][1][2] = 4322; BaryonWeight[3][2][1][2] = 0.5 * pspin_barion;
846
847 // Xi_c0/Xi_c0' cus - 4132/4312
848 Baryon[0][2][3][0] = 4132; BaryonWeight[0][2][3][0] *= 0.5; // Xi_c0
849 Baryon[0][3][2][0] = 4132; BaryonWeight[0][3][2][0] *= 0.5;
850 Baryon[2][0][3][0] = 4132; BaryonWeight[2][0][3][0] *= 0.5;
851 Baryon[2][3][0][0] = 4132; BaryonWeight[2][3][0][0] *= 0.5;
852 Baryon[3][0][2][0] = 4132; BaryonWeight[3][0][2][0] *= 0.5;
853 Baryon[3][2][0][0] = 4132; BaryonWeight[3][2][0][0] *= 0.5;
854
855 Baryon[0][2][3][2] = 4312; BaryonWeight[0][2][3][2] = 0.5 * pspin_barion; // Xi_c0'
856 Baryon[0][3][2][2] = 4312; BaryonWeight[0][3][2][2] = 0.5 * pspin_barion;
857 Baryon[2][0][3][2] = 4312; BaryonWeight[2][0][3][2] = 0.5 * pspin_barion;
858 Baryon[2][3][0][2] = 4312; BaryonWeight[2][3][0][2] = 0.5 * pspin_barion;
859 Baryon[3][0][2][2] = 4312; BaryonWeight[3][0][2][2] = 0.5 * pspin_barion;
860 Baryon[3][2][0][2] = 4312; BaryonWeight[3][2][0][2] = 0.5 * pspin_barion;
861
862 // Lambda_b0/Sigma_b0 bud - 5122/5212
863 Baryon[0][1][4][0] = 5122; BaryonWeight[0][1][4][0] *= 0.5; // Lambda_b0
864 Baryon[0][4][1][0] = 5122; BaryonWeight[0][4][1][0] *= 0.5;
865 Baryon[1][0][4][0] = 5122; BaryonWeight[1][0][4][0] *= 0.5;
866 Baryon[1][4][0][0] = 5122; BaryonWeight[1][4][0][0] *= 0.5;
867 Baryon[4][0][1][0] = 5122; BaryonWeight[4][0][1][0] *= 0.5;
868 Baryon[4][1][0][0] = 5122; BaryonWeight[4][1][0][0] *= 0.5;
869
870 Baryon[0][1][4][2] = 5212; BaryonWeight[0][1][4][2] = 0.5 * pspin_barion; // Sigma_b0
871 Baryon[0][4][1][2] = 5212; BaryonWeight[0][4][1][2] = 0.5 * pspin_barion;
872 Baryon[1][0][4][2] = 5212; BaryonWeight[1][0][4][2] = 0.5 * pspin_barion;
873 Baryon[1][4][0][2] = 5212; BaryonWeight[1][4][0][2] = 0.5 * pspin_barion;
874 Baryon[4][0][1][2] = 5212; BaryonWeight[4][0][1][2] = 0.5 * pspin_barion;
875 Baryon[4][1][0][2] = 5212; BaryonWeight[4][1][0][2] = 0.5 * pspin_barion;
876
877 // Xi_b0/Xi_b0' bus - 5232/5322
878 Baryon[1][2][4][0] = 5232; BaryonWeight[1][2][4][0] *= 0.5; // Xi_b0
879 Baryon[1][4][2][0] = 5232; BaryonWeight[1][4][2][0] *= 0.5;
880 Baryon[2][1][4][0] = 5232; BaryonWeight[2][1][4][0] *= 0.5;
881 Baryon[2][4][1][0] = 5232; BaryonWeight[2][4][1][0] *= 0.5;
882 Baryon[4][1][2][0] = 5232; BaryonWeight[4][1][2][0] *= 0.5;
883 Baryon[4][2][1][0] = 5232; BaryonWeight[4][2][1][0] *= 0.5;
884
885 Baryon[1][2][4][2] = 5322; BaryonWeight[1][2][4][2] = 0.5 * pspin_barion; // Xi_b0'
886 Baryon[1][4][2][2] = 5322; BaryonWeight[1][4][2][2] = 0.5 * pspin_barion;
887 Baryon[2][1][4][2] = 5322; BaryonWeight[2][1][4][2] = 0.5 * pspin_barion;
888 Baryon[2][4][1][2] = 5322; BaryonWeight[2][4][1][2] = 0.5 * pspin_barion;
889 Baryon[4][1][2][2] = 5322; BaryonWeight[4][1][2][2] = 0.5 * pspin_barion;
890 Baryon[4][2][1][2] = 5322; BaryonWeight[4][2][1][2] = 0.5 * pspin_barion;
891
892 // Xi_b-/Xi_b-' bus - 5132/5312
893 Baryon[0][2][4][0] = 5132; BaryonWeight[0][2][4][0] *= 0.5; // Xi_b-
894 Baryon[0][4][2][0] = 5132; BaryonWeight[0][4][2][0] *= 0.5;
895 Baryon[2][0][4][0] = 5132; BaryonWeight[2][0][4][0] *= 0.5;
896 Baryon[2][4][0][0] = 5132; BaryonWeight[2][4][0][0] *= 0.5;
897 Baryon[4][0][2][0] = 5132; BaryonWeight[4][0][2][0] *= 0.5;
898 Baryon[4][2][0][0] = 5132; BaryonWeight[4][2][0][0] *= 0.5;
899
900 Baryon[0][2][4][2] = 5312; BaryonWeight[0][2][4][2] = 0.5 * pspin_barion; // Xi_b-'
901 Baryon[0][4][2][2] = 5312; BaryonWeight[0][4][2][2] = 0.5 * pspin_barion;
902 Baryon[2][0][4][2] = 5312; BaryonWeight[2][0][4][2] = 0.5 * pspin_barion;
903 Baryon[2][4][0][2] = 5312; BaryonWeight[2][4][0][2] = 0.5 * pspin_barion;
904 Baryon[4][0][2][2] = 5312; BaryonWeight[4][0][2][2] = 0.5 * pspin_barion;
905 Baryon[4][2][0][2] = 5312; BaryonWeight[4][2][0][2] = 0.5 * pspin_barion;
906
907 for (G4int i=0; i<5; i++)
908 { for (G4int j=0; j<5; j++)
909 { for (G4int k=0; k<5; k++)
910 { for (G4int l=0; l<4; l++)
911 {
912 G4ParticleDefinition * TestHadron=
913 G4ParticleTable::GetParticleTable()->FindParticle(Baryon[i][j][k][l]);
914 /*
915 G4cout<<i<<" "<<j<<" "<<k<<" "<<l<<" "<<Baryon[i][j][k][l]<<" "<<TestHadron<<" "<<BaryonWeight[i][j][k][l];
916 if (TestHadron != nullptr) G4cout<<" "<<TestHadron->GetParticleName();
917 if ((TestHadron == nullptr)&&(Baryon[i][j][k][l] != 0)) G4cout<<" *****";
918 if ((TestHadron == nullptr)&&(Baryon[i][j][k][l] == 0)) G4cout<<" ---------------";
919 G4cout<<G4endl;
920 */
921 if ((TestHadron == nullptr)&&(Baryon[i][j][k][l] != 0)) Baryon[i][j][k][l] = 0;
922 }
923 }
924 }
925 }
926
927 // --------- Probabilities of q-qbar pair productions for kink or gluons.
928 G4double ProbUUbar = 0.33;
929 Prob_QQbar[0]=ProbUUbar; // Probability of ddbar production
930 Prob_QQbar[1]=ProbUUbar; // Probability of uubar production
931 Prob_QQbar[2]=1.0-2.*ProbUUbar; // Probability of ssbar production
932 Prob_QQbar[3]=0.0; // Probability of ccbar production
933 Prob_QQbar[4]=0.0; // Probability of bbbar production
934
935 for ( G4int i=0 ; i<350 ; i++ ) { // Must be checked
936 FS_LeftHadron[i] = 0;
937 FS_RightHadron[i] = 0;
938 FS_Weight[i] = 0.0;
939 }
940
941 NumberOf_FS = 0;
942 }
943
944 // --------------------------------------------------------------
945
946 void G4VLongitudinalStringDecay::SetMinimalStringMass(const G4FragmentingString * const string)
947 {
948 //MaxMass = -350.0*GeV;
949 G4double EstimatedMass=MaxMass;
950
951 G4ParticleDefinition* LeftParton = string->GetLeftParton();
952 G4ParticleDefinition* RightParton = string->GetRightParton();
953 if( LeftParton->GetParticleSubType() == RightParton->GetParticleSubType() ) { // q qbar, qq qqbar
954 if( LeftParton->GetPDGEncoding() * RightParton->GetPDGEncoding() > 0 ) {
955 // Not allowed combination of the partons
956 throw G4HadronicException(__FILE__, __LINE__,
957 "G4VLongitudinalStringDecay::SetMinimalStringMass: Illegal quark content as input");
958 }
959 }
960 if( LeftParton->GetParticleSubType() != RightParton->GetParticleSubType() ) { // q qq, qbar qqbar
961 if( LeftParton->GetPDGEncoding() * RightParton->GetPDGEncoding() < 0 ) {
962 // Not allowed combination of the partons
963 throw G4HadronicException(__FILE__, __LINE__,
964 "G4VLongitudinalStringDecay::SetMinimalStringMass: Illegal quark content as input");
965 }
966 }
967
968 G4int Qleft =std::abs(string->GetLeftParton()->GetPDGEncoding());
969 G4int Qright=std::abs(string->GetRightParton()->GetPDGEncoding());
970
971 if ((Qleft < 6) && (Qright < 6)) { // Q-Qbar string
972 EstimatedMass=minMassQQbarStr[Qleft-1][Qright-1];
973 MinimalStringMass=EstimatedMass;
974 SetMinimalStringMass2(EstimatedMass);
975 return;
976 }
977
978 if ((Qleft < 6) && (Qright > 1000)) { // Q - DiQ string
979 G4int q1=Qright/1000;
980 G4int q2=(Qright/100)%10;
981 EstimatedMass=minMassQDiQStr[Qleft-1][q1-1][q2-1];
982 MinimalStringMass=EstimatedMass; // It can be negative!
983 SetMinimalStringMass2(EstimatedMass);
984 return;
985 }
986
987 if ((Qleft > 1000) && (Qright < 6)) { // DiQ - Q string 6 6 6
988 G4int q1=Qleft/1000;
989 G4int q2=(Qleft/100)%10;
990 EstimatedMass=minMassQDiQStr[Qright-1][q1-1][q2-1];
991 MinimalStringMass=EstimatedMass; // It can be negative!
992 SetMinimalStringMass2(EstimatedMass);
993 return;
994 }
995
996 // DiQuark - Anti DiQuark string -----------------
997
998 G4double StringM=string->Get4Momentum().mag();
999
1000 #ifdef debug_LUNDfragmentation
1001 // G4cout<<"MinStringMass// Input String mass "<<string->Get4Momentum().mag()<<" Qleft "<<Qleft<<G4endl;
1002 #endif
1003
1004 G4int q1= Qleft/1000 ;
1005 G4int q2=(Qleft/100)%10 ;
1006
1007 G4int q3= Qright/1000 ;
1008 G4int q4=(Qright/100)%10;
1009
1010 // -------------- 2 baryon production or 2 mesons production --------
1011
1012 G4double EstimatedMass1 = minMassQDiQStr[q1-1][q2-1][0];
1013 G4double EstimatedMass2 = minMassQDiQStr[q3-1][q4-1][0];
1014 // Mass is negative if there is no corresponding particle.
1015
1016 if ( (EstimatedMass1 > 0.) && (EstimatedMass2 > 0.)) {
1017 EstimatedMass = EstimatedMass1 + EstimatedMass2;
1018 if ( StringM > EstimatedMass ) { // 2 baryon production is possible.
1019 MinimalStringMass=EstimatedMass1 + EstimatedMass2;
1020 SetMinimalStringMass2(EstimatedMass);
1021 return;
1022 }
1023 }
1024
1025 if ( (EstimatedMass1 < 0.) && (EstimatedMass2 > 0.)) {
1026 EstimatedMass = MaxMass;
1027 MinimalStringMass=EstimatedMass;
1028 SetMinimalStringMass2(EstimatedMass);
1029 return;
1030 }
1031
1032 if ( (EstimatedMass1 > 0.) && (EstimatedMass2 < 0.)) {
1033 EstimatedMass = EstimatedMass1;
1034 MinimalStringMass=EstimatedMass;
1035 SetMinimalStringMass2(EstimatedMass);
1036 return;
1037 }
1038
1039 // if ( EstimatedMass >= StringM ) {
1040 // ------------- Re-orangement ---------------
1041 EstimatedMass=std::min(minMassQQbarStr[q1-1][q3-1] + minMassQQbarStr[q2-1][q4-1],
1042 minMassQQbarStr[q1-1][q4-1] + minMassQQbarStr[q2-1][q3-1]);
1043
1044 // In principle, re-arrangement and 2 baryon production can compete.
1045 // More physics consideration is needed.
1046
1047 MinimalStringMass=EstimatedMass;
1048 SetMinimalStringMass2(EstimatedMass);
1049
1050 return;
1051 }
1052
1053 //--------------------------------------------------------------------------------------
1054
1055 void G4VLongitudinalStringDecay::SetMinimalStringMass2(const G4double aValue)
1056 {
1057 MinimalStringMass2=aValue * aValue;
1058 }
1059
1060