source: trunk/source/processes/hadronic/models/parton_string/hadronization/src/G4VLongitudinalStringDecay.cc@ 880

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18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
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25//
26//
27// $Id: G4VLongitudinalStringDecay.cc,v 1.8 2007/04/24 14:55:23 gunter Exp $
28// GEANT4 tag $Name: geant4-09-01-patch-02 $
29//
30// -----------------------------------------------------------------------------
31// GEANT 4 class implementation file
32//
33// History: first implementation, Maxim Komogorov, 1-Jul-1998
34// redesign Gunter Folger, August/September 2001
35// -----------------------------------------------------------------------------
36#include "G4ios.hh"
37#include "Randomize.hh"
38#include "G4VLongitudinalStringDecay.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 "G4ShortLivedTable.hh"
48#include "G4PhaseSpaceDecayChannel.hh"
49#include "G4VDecayChannel.hh"
50#include "G4DecayTable.hh"
51
52#include "G4DiQuarks.hh"
53#include "G4Quarks.hh"
54#include "G4Gluons.hh"
55
56//------------------------debug switches
57//#define DEBUG_LightFragmentationTest 1
58
59
60//********************************************************************************
61// Constructors
62
63G4VLongitudinalStringDecay::G4VLongitudinalStringDecay()
64{
65 MassCut = 0.35*GeV;
66 ClusterMass = 0.15*GeV;
67
68 SmoothParam = 0.9;
69 StringLoopInterrupt = 1000;
70 ClusterLoopInterrupt = 500;
71
72// Changable Parameters below.
73
74 SigmaQT = 0.5 * GeV;
75
76 StrangeSuppress = 0.44; // 27 % strange quarks produced, ie. u:d:s=1:1:0.27
77 DiquarkSuppress = 0.1;
78 DiquarkBreakProb = 0.1;
79
80 //... pspin_meson is probability to create vector meson
81 pspin_meson = 0.5;
82
83 //... pspin_barion is probability to create 3/2 barion
84 pspin_barion = 0.5;
85
86 //... vectorMesonMix[] is quark mixing parameters for vector mesons (Variable spin = 3)
87 vectorMesonMix.resize(6);
88 vectorMesonMix[0] = 0.5;
89 vectorMesonMix[1] = 0.0;
90 vectorMesonMix[2] = 0.5;
91 vectorMesonMix[3] = 0.0;
92 vectorMesonMix[4] = 1.0;
93 vectorMesonMix[5] = 1.0;
94
95 //... scalarMesonMix[] is quark mixing parameters for scalar mesons (Variable spin=1)
96 scalarMesonMix.resize(6);
97 scalarMesonMix[0] = 0.5;
98 scalarMesonMix[1] = 0.25;
99 scalarMesonMix[2] = 0.5;
100 scalarMesonMix[3] = 0.25;
101 scalarMesonMix[4] = 1.0;
102 scalarMesonMix[5] = 0.5;
103
104// Parameters may be changed until the first fragmentation starts
105 PastInitPhase=false;
106 hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion,
107 scalarMesonMix,vectorMesonMix);
108}
109
110
111G4VLongitudinalStringDecay::~G4VLongitudinalStringDecay()
112 {
113 delete hadronizer;
114 }
115
116//=============================================================================================-------------
117
118// Operators
119
120//const & G4VLongitudinalStringDecay::operator=(const G4VLongitudinalStringDecay &)
121// {
122// }
123
124//----------------------------------------------------------------------------------------------------------
125
126int G4VLongitudinalStringDecay::operator==(const G4VLongitudinalStringDecay &) const
127 {
128 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::operator== forbidden");
129 return false;
130 }
131
132//----------------------------------------------------------------------------------------------------------
133
134int G4VLongitudinalStringDecay::operator!=(const G4VLongitudinalStringDecay &) const
135 {
136 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::operator!= forbidden");
137 return true;
138 }
139
140//==========================================================================================================
141
142G4int G4VLongitudinalStringDecay::SampleQuarkFlavor(void)
143 {
144 return (1 + (int)(G4UniformRand()/StrangeSuppress));
145 }
146
147//----------------------------------------------------------------------------------------------------------
148
149G4VLongitudinalStringDecay::pDefPair G4VLongitudinalStringDecay::CreatePartonPair(G4int NeedParticle,G4bool AllowDiquarks)
150{
151// NeedParticle = +1 for Particle, -1 for Antiparticle
152
153 if ( AllowDiquarks && G4UniformRand() < DiquarkSuppress )
154 {
155 // Create a Diquark - AntiDiquark pair , first in pair is anti to IsParticle
156 G4int q1 = SampleQuarkFlavor();
157 G4int q2 = SampleQuarkFlavor();
158 G4int spin = (q1 != q2 && G4UniformRand() <= 0.5)? 1 : 3;
159 // convention: quark with higher PDG number is first
160 G4int PDGcode = (std::max(q1,q2) * 1000 + std::min(q1,q2) * 100 + spin) * NeedParticle;
161 return pDefPair (FindParticle(-PDGcode),FindParticle(PDGcode));
162
163
164 } else {
165 // Create a Quark - AntiQuark pair, first in pair IsParticle
166 G4int PDGcode=SampleQuarkFlavor()*NeedParticle;
167 return pDefPair (FindParticle(PDGcode),FindParticle(-PDGcode));
168 }
169
170}
171
172//----------------------------------------------------------------------------------------------------------
173
174// G4ThreeVector G4VLongitudinalStringDecay::SampleQuarkPt()
175// {
176// G4double width_param= 2.0 * GeV*GeV;
177// G4double R = G4UniformRand();
178// G4double Pt = std::sqrt(width_param*R/(1-R));
179// G4double phi = 2.*pi*G4UniformRand();
180// return G4ThreeVector(Pt * std::cos(phi),Pt * std::sin(phi),0);
181// }
182G4ThreeVector G4VLongitudinalStringDecay::SampleQuarkPt()
183 {
184 G4double Pt = -std::log(G4UniformRand());
185 Pt = SigmaQT * std::sqrt(Pt);
186 G4double phi = 2.*pi*G4UniformRand();
187 return G4ThreeVector(Pt * std::cos(phi),Pt * std::sin(phi),0);
188 }
189
190//----------------------------------------------------------------------------------------------------------
191
192void G4VLongitudinalStringDecay::CalculateHadronTimePosition(G4double theInitialStringMass, G4KineticTrackVector* Hadrons)
193 {
194 // `yo-yo` formation time
195 const G4double kappa = 1.0 * GeV/fermi;
196 for(size_t c1 = 0; c1 < Hadrons->size(); c1++)
197 {
198 G4double SumPz = 0;
199 G4double SumE = 0;
200 for(size_t c2 = 0; c2 < c1; c2++)
201 {
202 SumPz += Hadrons->operator[](c2)->Get4Momentum().pz();
203 SumE += Hadrons->operator[](c2)->Get4Momentum().e();
204 }
205 G4double HadronE = Hadrons->operator[](c1)->Get4Momentum().e();
206 G4double HadronPz = Hadrons->operator[](c1)->Get4Momentum().pz();
207 Hadrons->operator[](c1)->SetFormationTime((theInitialStringMass - 2.*SumPz + HadronE - HadronPz)/(2.*kappa));
208 G4ThreeVector aPosition(0, 0, (theInitialStringMass - 2.*SumE - HadronE + HadronPz)/(2.*kappa));
209 Hadrons->operator[](c1)->SetPosition(aPosition);
210 }
211 }
212
213//----------------------------------------------------------------------------------------------------------
214
215/*
216void G4VLongitudinalStringDecay::CalculateHadronTimePosition(G4double theInitialStringMass, G4KineticTrackVector* Hadrons)
217 {
218 // 'constituent' formation time
219 const G4double kappa = 1.0 * GeV/fermi;
220 for(G4int c1 = 0; c1 < Hadrons->length(); c1++)
221 {
222 G4double SumPz = 0;
223 G4double SumE = 0;
224 for(G4int c2 = 0; c2 <= c1; c2++)
225 {
226 SumPz += Hadrons->at(c2)->Get4Momentum().pz();
227 SumE += Hadrons->at(c2)->Get4Momentum().e();
228 }
229 Hadrons->at(c1)->SetFormationTime((theInitialStringMass - 2.*SumPz)/(2.*kappa));
230 G4ThreeVector aPosition(0, 0, (theInitialStringMass - 2.*SumE)/(2.*kappa));
231 Hadrons->at(c1)->SetPosition(aPosition);
232 }
233 c1 = Hadrons->length()-1;
234 Hadrons->at(c1)->SetFormationTime(Hadrons->at(c1-1)->GetFormationTime());
235 Hadrons->at(c1)->SetPosition(Hadrons->at(c1-1)->GetPosition());
236 }
237*/
238
239//----------------------------------------------------------------------------------------------------------
240
241G4ParticleDefinition *
242 G4VLongitudinalStringDecay::QuarkSplitup(G4ParticleDefinition*
243 decay, G4ParticleDefinition *&created)
244{
245 G4int IsParticle=(decay->GetPDGEncoding()>0) ? -1 : +1; // if we have a quark, we need antiquark (or diquark)
246 pDefPair QuarkPair = CreatePartonPair(IsParticle);
247 created = QuarkPair.second;
248 return hadronizer->Build(QuarkPair.first, decay);
249
250}
251
252//----------------------------------------------------------------------------------------------------------
253
254G4ParticleDefinition *G4VLongitudinalStringDecay::DiQuarkSplitup(
255 G4ParticleDefinition* decay,
256 G4ParticleDefinition *&created)
257{
258 //... can Diquark break or not?
259 if (G4UniformRand() < DiquarkBreakProb ){
260 //... Diquark break
261
262 G4int stableQuarkEncoding = decay->GetPDGEncoding()/1000;
263 G4int decayQuarkEncoding = (decay->GetPDGEncoding()/100)%10;
264 if (G4UniformRand() < 0.5)
265 {
266 G4int Swap = stableQuarkEncoding;
267 stableQuarkEncoding = decayQuarkEncoding;
268 decayQuarkEncoding = Swap;
269 }
270
271 G4int IsParticle=(decayQuarkEncoding>0) ? -1 : +1;
272 // if we have a quark, we need antiquark)
273 pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted
274 //... Build new Diquark
275 G4int QuarkEncoding=QuarkPair.second->GetPDGEncoding();
276 G4int i10 = std::max(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding));
277 G4int i20 = std::min(std::abs(QuarkEncoding), std::abs(stableQuarkEncoding));
278 G4int spin = (i10 != i20 && G4UniformRand() <= 0.5)? 1 : 3;
279 G4int NewDecayEncoding = -1*IsParticle*(i10 * 1000 + i20 * 100 + spin);
280 created = FindParticle(NewDecayEncoding);
281 G4ParticleDefinition * decayQuark=FindParticle(decayQuarkEncoding);
282 G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decayQuark);
283 return had;
284// return hadronizer->Build(QuarkPair.first, decayQuark);
285
286 } else {
287 //... Diquark does not break
288
289 G4int IsParticle=(decay->GetPDGEncoding()>0) ? +1 : -1;
290 // if we have a diquark, we need quark)
291 pDefPair QuarkPair = CreatePartonPair(IsParticle,false); // no diquarks wanted
292 created = QuarkPair.second;
293
294 G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decay);
295 return had;
296// return G4ParticleDefinition * had=hadronizer->Build(QuarkPair.first, decay);
297 }
298}
299
300//-----------------------------------------------------------------------------------------
301
302G4KineticTrack * G4VLongitudinalStringDecay::Splitup(
303 G4FragmentingString *string,
304 G4FragmentingString *&newString)
305{
306
307 //... random choice of string end to use for creating the hadron (decay)
308 SideOfDecay = (G4UniformRand() < 0.5)? 1: -1;
309 if (SideOfDecay < 0)
310 {
311 string->SetLeftPartonStable();
312 } else
313 {
314 string->SetRightPartonStable();
315 }
316
317 G4ParticleDefinition *newStringEnd;
318 G4ParticleDefinition * HadronDefinition;
319 if (string->DecayIsQuark())
320 {
321 HadronDefinition= QuarkSplitup(string->GetDecayParton(), newStringEnd);
322 } else {
323 HadronDefinition= DiQuarkSplitup(string->GetDecayParton(), newStringEnd);
324 }
325// create new String from old, ie. keep Left and Right order, but replace decay
326 G4LorentzVector* HadronMomentum=SplitEandP(HadronDefinition, string);
327
328 G4KineticTrack * Hadron =0;
329 if ( HadronMomentum != 0 ) {
330
331 G4ThreeVector Pos;
332 Hadron = new G4KineticTrack(HadronDefinition, 0,Pos, *HadronMomentum);
333
334 newString=new G4FragmentingString(*string,newStringEnd,
335 HadronMomentum);
336
337 delete HadronMomentum;
338 }
339 return Hadron;
340}
341
342//----------------------------------------------------------------------------------------------------------
343
344G4ExcitedString *G4VLongitudinalStringDecay::CPExcited(const G4ExcitedString & in)
345{
346 G4Parton *Left=new G4Parton(*in.GetLeftParton());
347 G4Parton *Right=new G4Parton(*in.GetRightParton());
348 return new G4ExcitedString(Left,Right,in.GetDirection());
349}
350
351G4double G4VLongitudinalStringDecay::FragmentationMass(
352 const G4FragmentingString *
353 const string,
354 Pcreate build,
355 pDefPair * pdefs)
356{
357
358 G4double mass;
359 static G4bool NeedInit(true);
360 static std::vector<double> nomix;
361 static G4HadronBuilder * minMassHadronizer;
362 if ( NeedInit )
363 {
364 NeedInit = false;
365 nomix.resize(6);
366 for ( G4int i=0; i<6 ; i++ ) nomix[i]=0;
367// minMassHadronizer=new G4HadronBuilder(pspin_meson,pspin_barion,nomix,nomix);
368 minMassHadronizer=hadronizer;
369 }
370
371 if ( build==0 ) build=&G4HadronBuilder::BuildLowSpin;
372
373 G4ParticleDefinition *Hadron1, *Hadron2=0;
374
375 if (!string->FourQuarkString() )
376 {
377 // spin 0 meson or spin 1/2 barion will be built
378
379 Hadron1 = (minMassHadronizer->*build)(string->GetLeftParton(),
380 string->GetRightParton());
381 mass= (Hadron1)->GetPDGMass();
382 } else
383 {
384 //... string is qq--qqbar: Build two stable hadrons,
385 //... with extra uubar or ddbar quark pair
386 G4int iflc = (G4UniformRand() < 0.5)? 1 : 2;
387 if (string->GetLeftParton()->GetPDGEncoding() < 0) iflc = -iflc;
388
389 //... theSpin = 4; spin 3/2 baryons will be built
390 Hadron1 = (minMassHadronizer->*build)(string->GetLeftParton(),FindParticle(iflc));
391 Hadron2 =(minMassHadronizer->*build)(string->GetRightParton(),FindParticle(-iflc));
392 mass = (Hadron1)->GetPDGMass() + (Hadron2)->GetPDGMass();
393 }
394
395 if ( pdefs != 0 )
396 { // need to return hadrons as well....
397 pdefs->first = Hadron1;
398 pdefs->second = Hadron2;
399 }
400
401 return mass;
402}
403
404G4KineticTrackVector* G4VLongitudinalStringDecay::LightFragmentationTest(const
405 G4ExcitedString * const string)
406{
407 // Check string decay threshold
408
409 G4KineticTrackVector * result=0; // return 0 when string exceeds the mass cut
410
411 pDefPair hadrons((G4ParticleDefinition *)0,(G4ParticleDefinition *)0);
412 G4FragmentingString aString(*string);
413 if ( sqr(FragmentationMass(&aString,0,&hadrons)+MassCut) < aString.Mass2()) {
414 return 0;
415 }
416
417 result=new G4KineticTrackVector;
418
419 if ( hadrons.second ==0 )
420 {
421 // Substitute string by light hadron, Note that Energy is not conserved here!
422
423#ifdef DEBUG_LightFragmentationTest
424 G4cout << "VlongSF Warning replacing string by single hadron "
425 << hadrons.first->GetParticleName()
426 << "string .. " << string->Get4Momentum() << " "
427 << string->Get4Momentum().m() << G4endl;
428#endif
429
430 G4ThreeVector Mom3 = string->Get4Momentum().vect();
431 G4LorentzVector Mom(Mom3,
432 std::sqrt(Mom3.mag2() + sqr(hadrons.first->GetPDGMass())));
433 result->push_back(new G4KineticTrack(hadrons.first, 0, string->GetPosition(), Mom));
434 } else
435 {
436 //... string was qq--qqbar type: Build two stable hadrons,
437
438#ifdef DEBUG_LightFragmentationTest
439 G4cout << "VlongSF Warning replacing qq-qqbar string by TWO hadrons "
440 << hadrons.first->GetParticleName() << " / "
441 << hadrons.second->GetParticleName()
442 << "string .. " << string->Get4Momentum() << " "
443 << string->Get4Momentum().m() << G4endl;
444#endif
445
446 G4LorentzVector Mom1, Mom2;
447 Sample4Momentum(&Mom1, hadrons.first->GetPDGMass(),
448 &Mom2,hadrons.second->GetPDGMass(),
449 string->Get4Momentum().mag());
450 result->push_back(new G4KineticTrack(hadrons.first, 0, string->GetPosition(), Mom1));
451 result->push_back(new G4KineticTrack(hadrons.second, 0, string->GetPosition(), Mom2));
452 G4ThreeVector Velocity = string->Get4Momentum().boostVector();
453 result->Boost(Velocity);
454 }
455
456 return result;
457
458}
459
460//----------------------------------------------------------------------------------------------------------
461
462G4ParticleDefinition* G4VLongitudinalStringDecay::FindParticle(G4int Encoding)
463 {
464 G4ParticleDefinition* ptr = G4ParticleTable::GetParticleTable()->FindParticle(Encoding);
465 if (ptr == NULL)
466 {
467 G4cout << "Particle with encoding "<<Encoding<<" does not exist!!!"<<G4endl;
468 throw G4HadronicException(__FILE__, __LINE__, "Check your particle table");
469 }
470 return ptr;
471 }
472
473//----------------------------------------------------------------------------------------------------------
474
475void G4VLongitudinalStringDecay::SetSigmaTransverseMomentum(G4double aValue)
476{
477 if ( PastInitPhase ) {
478 throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetSigmaTransverseMomentum after FragmentString() not allowed");
479 } else {
480 SigmaQT = aValue;
481 }
482}
483
484//----------------------------------------------------------------------------------------------------------
485
486void G4VLongitudinalStringDecay::SetStrangenessSuppression(G4double aValue)
487{
488 if ( PastInitPhase ) {
489 throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetStrangenessSuppression after FragmentString() not allowed");
490 } else {
491 StrangeSuppress = aValue;
492 }
493}
494
495//----------------------------------------------------------------------------------------------------------
496
497void G4VLongitudinalStringDecay::SetDiquarkSuppression(G4double aValue)
498{
499 if ( PastInitPhase ) {
500 throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetDiquarkSuppression after FragmentString() not allowed");
501 } else {
502 DiquarkSuppress = aValue;
503 }
504}
505
506void G4VLongitudinalStringDecay::SetDiquarkBreakProbability(G4double aValue)
507{
508 if ( PastInitPhase ) {
509 throw G4HadronicException(__FILE__, __LINE__, "4VLongitudinalStringDecay::SetDiquarkBreakProbability after FragmentString() not allowed");
510 } else {
511 DiquarkBreakProb = aValue;
512 }
513}
514
515//----------------------------------------------------------------------------------------------------------
516
517void G4VLongitudinalStringDecay::SetVectorMesonProbability(G4double aValue)
518{
519 if ( PastInitPhase ) {
520 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetVectorMesonProbability after FragmentString() not allowed");
521 } else {
522 pspin_meson = aValue;
523 delete hadronizer;
524 hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion,
525 scalarMesonMix,vectorMesonMix);
526 }
527}
528
529//----------------------------------------------------------------------------------------------------------
530
531void G4VLongitudinalStringDecay::SetSpinThreeHalfBarionProbability(G4double aValue)
532{
533 if ( PastInitPhase ) {
534 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetSpinThreeHalfBarionProbability after FragmentString() not allowed");
535 } else {
536 pspin_barion = aValue;
537 delete hadronizer;
538 hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion,
539 scalarMesonMix,vectorMesonMix);
540 }
541}
542
543//----------------------------------------------------------------------------------------------------------
544
545void G4VLongitudinalStringDecay::SetScalarMesonMixings(std::vector<G4double> aVector)
546{
547 if ( PastInitPhase ) {
548 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetScalarMesonMixings after FragmentString() not allowed");
549 } else {
550 if ( aVector.size() < 6 )
551 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetScalarMesonMixings( argument Vector too small");
552 scalarMesonMix[0] = aVector[0];
553 scalarMesonMix[1] = aVector[1];
554 scalarMesonMix[2] = aVector[2];
555 scalarMesonMix[3] = aVector[3];
556 scalarMesonMix[4] = aVector[4];
557 scalarMesonMix[5] = aVector[5];
558 delete hadronizer;
559 hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion,
560 scalarMesonMix,vectorMesonMix);
561 }
562}
563
564//----------------------------------------------------------------------------------------------------------
565
566void G4VLongitudinalStringDecay::SetVectorMesonMixings(std::vector<G4double> aVector)
567{
568 if ( PastInitPhase ) {
569 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetVectorMesonMixings after FragmentString() not allowed");
570 } else {
571 if ( aVector.size() < 6 )
572 throw G4HadronicException(__FILE__, __LINE__, "G4VLongitudinalStringDecay::SetVectorMesonMixings( argument Vector too small");
573 vectorMesonMix[0] = aVector[0];
574 vectorMesonMix[1] = aVector[1];
575 vectorMesonMix[2] = aVector[2];
576 vectorMesonMix[3] = aVector[3];
577 vectorMesonMix[4] = aVector[4];
578 vectorMesonMix[5] = aVector[5];
579 delete hadronizer;
580 hadronizer = new G4HadronBuilder(pspin_meson,pspin_barion,
581 scalarMesonMix,vectorMesonMix);
582
583 }
584}
585//*******************************************************************************************************
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