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26 // $Id: G4NuTauNucleusNcModel.cc 91806 2015-08-06 12:20:45Z gcosmo $
27 //
28 // Geant4 Header : G4NuTauNucleusNcModel
29 //
30 // Author : V.Grichine 12.2.19
31 //
32
33 #include "G4NuTauNucleusNcModel.hh"
34 #include "G4NeutrinoNucleusModel.hh"
35
36 // #include "G4NuMuResQX.hh"
37
38 #include "G4SystemOfUnits.hh"
39 #include "G4ParticleTable.hh"
40 #include "G4ParticleDefinition.hh"
41 #include "G4IonTable.hh"
42 #include "Randomize.hh"
43 #include "G4RandomDirection.hh"
44
45 // #include "G4Integrator.hh"
46 #include "G4DataVector.hh"
47 #include "G4PhysicsTable.hh"
48 #include "G4KineticTrack.hh"
49 #include "G4DecayKineticTracks.hh"
50 #include "G4KineticTrackVector.hh"
51 #include "G4Fragment.hh"
52 #include "G4ReactionProductVector.hh"
53
54
55 #include "G4NeutrinoTau.hh"
56 #include "G4AntiNeutrinoTau.hh"
57 #include "G4Nucleus.hh"
58 #include "G4LorentzVector.hh"
59
60 using namespace std;
61 using namespace CLHEP;
62
63 #ifdef G4MULTITHREADED
64 G4Mutex G4NuTauNucleusNcModel::numuNucleusModel = G4MUTEX_INITIALIZER;
65 #endif
66
67
68 G4NuTauNucleusNcModel::G4NuTauNucleusNcModel(const G4String& name)
69 : G4NeutrinoNucleusModel(name)
70 {
71 SetMinEnergy( 0.0*GeV );
72 SetMaxEnergy( 100.*TeV );
73 SetMinEnergy(1.e-6*eV);
74
75 theNuTau = G4NeutrinoTau::NeutrinoTau();
76 theANuTau = G4AntiNeutrinoTau::AntiNeutrinoTau();
77
78 fMnumu = 0.;
79 fData = fMaster = false;
80 InitialiseModel();
81
82 }
83
84
85 G4NuTauNucleusNcModel::~G4NuTauNucleusNcModel()
86 {}
87
88
89 void G4NuTauNucleusNcModel::ModelDescription(std::ostream& outFile) const
90 {
91
92 outFile << "G4NuTauNucleusNcModel is a tau-neutrino-nucleus (neutral current) scattering\n"
93 << "model which uses the standard model \n"
94 << "transfer parameterization. The model is fully relativistic\n";
95
96 }
97
98 /////////////////////////////////////////////////////////
99 //
100 // Read data from G4PARTICLEXSDATA (locally PARTICLEXSDATA)
101
102 void G4NuTauNucleusNcModel::InitialiseModel()
103 {
104 G4String pName = "nu_mu";
105
106 G4int nSize(0), i(0), j(0), k(0);
107
108 if(!fData)
109 {
110 #ifdef G4MULTITHREADED
111 G4MUTEXLOCK(&numuNucleusModel);
112 if(!fData)
113 {
114 #endif
115 fMaster = true;
116 #ifdef G4MULTITHREADED
117 }
118 G4MUTEXUNLOCK(&numuNucleusModel);
119 #endif
120 }
121
122 if(fMaster)
123 {
124 const char* path = G4FindDataDir("G4PARTICLEXSDATA");
125 std::ostringstream ost1, ost2, ost3, ost4;
126 ost1 << path << "/" << "neutrino" << "/" << pName << "/xarraynckr";
127
128 std::ifstream filein1( ost1.str().c_str() );
129
130 // filein.open("$PARTICLEXSDATA/");
131
132 filein1>>nSize;
133
134 for( k = 0; k < fNbin; ++k )
135 {
136 for( i = 0; i <= fNbin; ++i )
137 {
138 filein1 >> fNuMuXarrayKR[k][i];
139 // G4cout<< fNuMuXarrayKR[k][i] << " ";
140 }
141 }
142 // G4cout<<G4endl<<G4endl;
143
144 ost2 << path << "/" << "neutrino" << "/" << pName << "/xdistrnckr";
145 std::ifstream filein2( ost2.str().c_str() );
146
147 filein2>>nSize;
148
149 for( k = 0; k < fNbin; ++k )
150 {
151 for( i = 0; i < fNbin; ++i )
152 {
153 filein2 >> fNuMuXdistrKR[k][i];
154 // G4cout<< fNuMuXdistrKR[k][i] << " ";
155 }
156 }
157 // G4cout<<G4endl<<G4endl;
158
159 ost3 << path << "/" << "neutrino" << "/" << pName << "/q2arraynckr";
160 std::ifstream filein3( ost3.str().c_str() );
161
162 filein3>>nSize;
163
164 for( k = 0; k < fNbin; ++k )
165 {
166 for( i = 0; i <= fNbin; ++i )
167 {
168 for( j = 0; j <= fNbin; ++j )
169 {
170 filein3 >> fNuMuQarrayKR[k][i][j];
171 // G4cout<< fNuMuQarrayKR[k][i][j] << " ";
172 }
173 }
174 }
175 // G4cout<<G4endl<<G4endl;
176
177 ost4 << path << "/" << "neutrino" << "/" << pName << "/q2distrnckr";
178 std::ifstream filein4( ost4.str().c_str() );
179
180 filein4>>nSize;
181
182 for( k = 0; k < fNbin; ++k )
183 {
184 for( i = 0; i <= fNbin; ++i )
185 {
186 for( j = 0; j < fNbin; ++j )
187 {
188 filein4 >> fNuMuQdistrKR[k][i][j];
189 // G4cout<< fNuMuQdistrKR[k][i][j] << " ";
190 }
191 }
192 }
193 fData = true;
194 }
195 }
196
197 /////////////////////////////////////////////////////////
198
199 G4bool G4NuTauNucleusNcModel::IsApplicable(const G4HadProjectile & aPart,
200 G4Nucleus & )
201 {
202 G4bool result = false;
203 G4String pName = aPart.GetDefinition()->GetParticleName();
204 G4double energy = aPart.GetTotalEnergy();
205
206 if( pName == "nu_tau" // || pName == "anti_nu_tau" )
207 &&
208 energy > fMinNuEnergy )
209 {
210 result = true;
211 }
212
213 return result;
214 }
215
216 /////////////////////////////////////////// ClusterDecay ////////////////////////////////////////////////////////////
217 //
218 //
219
220 G4HadFinalState* G4NuTauNucleusNcModel::ApplyYourself(
221 const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
222 {
223 theParticleChange.Clear();
224 fProton = f2p2h = fBreak = false;
225 const G4HadProjectile* aParticle = &aTrack;
226 G4double energy = aParticle->GetTotalEnergy();
227
228 G4String pName = aParticle->GetDefinition()->GetParticleName();
229
230 if( energy < fMinNuEnergy )
231 {
232 theParticleChange.SetEnergyChange(energy);
233 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
234 return &theParticleChange;
235 }
236 SampleLVkr( aTrack, targetNucleus);
237
238 if( fBreak == true || fEmu < fMnumu ) // ~5*10^-6
239 {
240 // G4cout<<"ni, ";
241 theParticleChange.SetEnergyChange(energy);
242 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
243 return &theParticleChange;
244 }
245
246 // LVs of initial state
247
248 G4LorentzVector lvp1 = aParticle->Get4Momentum();
249 G4LorentzVector lvt1( 0., 0., 0., fM1 );
250 G4double mPip = G4ParticleTable::GetParticleTable()->FindParticle(211)->GetPDGMass();
251
252 // 1-pi by fQtransfer && nu-energy
253 G4LorentzVector lvpip1( 0., 0., 0., mPip );
254 G4LorentzVector lvsum, lv2, lvX;
255 G4ThreeVector eP;
256 G4double cost(1.), sint(0.), phi(0.), muMom(0.), massX2(0.);
257 G4DynamicParticle* aLept = nullptr; // lepton lv
258
259 G4int Z = targetNucleus.GetZ_asInt();
260 G4int A = targetNucleus.GetA_asInt();
261 G4double mTarg = targetNucleus.AtomicMass(A,Z);
262 G4int pdgP(0), qB(0);
263 // G4double mSum = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass() + mPip;
264
265 G4int iPi = GetOnePionIndex(energy);
266 G4double p1pi = GetNuMuOnePionProb( iPi, energy);
267
268 if( p1pi > G4UniformRand() && fCosTheta > 0.9 ) // && fQtransfer < 0.95*GeV ) // mu- & coherent pion + nucleus
269 {
270 // lvsum = lvp1 + lvpip1;
271 lvsum = lvp1 + lvt1;
272 // cost = fCosThetaPi;
273 cost = fCosTheta;
274 sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
275 phi = G4UniformRand()*CLHEP::twopi;
276 eP = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
277
278 // muMom = sqrt(fEmuPi*fEmuPi-fMnumu*fMnumu);
279 muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
280
281 eP *= muMom;
282
283 // lv2 = G4LorentzVector( eP, fEmuPi );
284 lv2 = G4LorentzVector( eP, fEmu );
285 lv2 = fLVl;
286
287 lvX = lvsum - lv2;
288 lvX = fLVh;
289 massX2 = lvX.m2();
290 G4double massX = lvX.m();
291 G4double massR = fLVt.m();
292
293 // if ( massX2 <= 0. ) // vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
294 if ( massX2 <= fM1*fM1 ) // 9-3-20 vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
295 if ( lvX.e() <= fM1 ) // 9-3-20 vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
296 {
297 theParticleChange.SetEnergyChange(energy);
298 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
299 return &theParticleChange;
300 }
301 fW2 = massX2;
302
303 if( pName == "nu_tau" ) aLept = new G4DynamicParticle( theNuTau, lv2 );
304 else if( pName == "anti_nu_tau") aLept = new G4DynamicParticle( theANuTau, lv2 );
305 else
306 {
307 theParticleChange.SetEnergyChange(energy);
308 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
309 return &theParticleChange;
310 }
311
312 pdgP = 111;
313
314 G4double eCut; // = fMpi + 0.5*(fMpi*fMpi - massX2)/mTarg; // massX -> fMpi
315
316 if( A > 1 )
317 {
318 eCut = (fMpi + mTarg)*(fMpi + mTarg) - (massX + massR)*(massX + massR);
319 eCut /= 2.*massR;
320 eCut += massX;
321 }
322 else eCut = fM1 + fMpi;
323
324 if ( lvX.e() > eCut ) // && sqrt( GetW2() ) < 1.4*GeV ) //
325 {
326 CoherentPion( lvX, pdgP, targetNucleus);
327 }
328 else
329 {
330 theParticleChange.SetEnergyChange(energy);
331 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
332 return &theParticleChange;
333 }
334 theParticleChange.AddSecondary( aLept, fSecID );
335
336 return &theParticleChange;
337 }
338 else // lepton part in lab
339 {
340 lvsum = lvp1 + lvt1;
341 cost = fCosTheta;
342 sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
343 phi = G4UniformRand()*CLHEP::twopi;
344 eP = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
345
346 muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
347
348 eP *= muMom;
349
350 lv2 = G4LorentzVector( eP, fEmu );
351
352 lvX = lvsum - lv2;
353
354 massX2 = lvX.m2();
355
356 if ( massX2 <= 0. ) // vmg: very rarely ~ (1-4)e-6 due to big Q2/x, to be improved
357 {
358 theParticleChange.SetEnergyChange(energy);
359 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
360 return &theParticleChange;
361 }
362 fW2 = massX2;
363
364 aLept = new G4DynamicParticle( theNuTau, lv2 );
365
366 theParticleChange.AddSecondary( aLept, fSecID );
367 }
368
369 // hadron part
370
371 fRecoil = nullptr;
372 fCascade = false;
373 fString = false;
374
375 if( A == 1 )
376 {
377 qB = 1;
378
379 // if( G4UniformRand() > 0.1 ) // > 0.9999 ) // > 0.0001 ) //
380 {
381 ClusterDecay( lvX, qB );
382 }
383 return &theParticleChange;
384 }
385 G4Nucleus recoil;
386 G4double ratio = G4double(Z)/G4double(A);
387
388 if( ratio > G4UniformRand() ) // proton is excited
389 {
390 fProton = true;
391 recoil = G4Nucleus(A-1,Z-1);
392 fRecoil = &recoil;
393 fMt = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass()
394 + G4ParticleTable::GetParticleTable()->FindParticle(111)->GetPDGMass();
395 }
396 else // excited neutron
397 {
398 fProton = false;
399 recoil = G4Nucleus(A-1,Z);
400 fRecoil = &recoil;
401 fMt = G4ParticleTable::GetParticleTable()->FindParticle(2112)->GetPDGMass()
402 + G4ParticleTable::GetParticleTable()->FindParticle(111)->GetPDGMass();
403 }
404 // G4int index = GetEnergyIndex(energy);
405 G4int nepdg = aParticle->GetDefinition()->GetPDGEncoding();
406
407 G4double qeTotRat; // = GetNuMuQeTotRat(index, energy);
408 qeTotRat = CalculateQEratioA( Z, A, energy, nepdg);
409
410 G4ThreeVector dX = (lvX.vect()).unit();
411 G4double eX = lvX.e(); // excited nucleon
412 G4double mX = sqrt(massX2);
413
414 if( qeTotRat > G4UniformRand() || mX <= fMt ) // || eX <= 1232.*MeV) // QE
415 {
416 fString = false;
417
418 G4double rM;
419 if( fProton )
420 {
421 fPDGencoding = 2212;
422 fMr = proton_mass_c2;
423 recoil = G4Nucleus(A-1,Z-1);
424 fRecoil = &recoil;
425 rM = recoil.AtomicMass(A-1,Z-1);
426 }
427 else
428 {
429 fPDGencoding = 2112;
430 fMr = G4ParticleTable::GetParticleTable()->
431 FindParticle(fPDGencoding)->GetPDGMass(); // 939.5654133*MeV;
432 recoil = G4Nucleus(A-1,Z);
433 fRecoil = &recoil;
434 rM = recoil.AtomicMass(A-1,Z);
435 }
436 G4double eTh = fMr+0.5*(fMr*fMr-mX*mX)/rM;
437
438 if(eX <= eTh) // vmg, very rarely out of kinematics
439 {
440 theParticleChange.SetEnergyChange(energy);
441 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
442 return &theParticleChange;
443 }
444 FinalBarion( lvX, 0, fPDGencoding ); // p(n)+deexcited recoil
445 }
446 else // if ( eX < 9500000.*GeV ) // < 25.*GeV) // < 95.*GeV ) // < 2.5*GeV ) //cluster decay
447 {
448 if ( fProton && pName == "nu_tau" ) qB = 1;
449 else if( !fProton && pName == "nu_tau" ) qB = 0;
450
451 ClusterDecay( lvX, qB );
452 }
453 return &theParticleChange;
454 }
455
456
457 /////////////////////////////////////////////////////////////////////
458 ////////////////////////////////////////////////////////////////////
459 ///////////////////////////////////////////////////////////////////
460
461 /////////////////////////////////////////////////
462 //
463 // sample x, then Q2
464
465 void G4NuTauNucleusNcModel::SampleLVkr(const G4HadProjectile & aTrack, G4Nucleus& targetNucleus)
466 {
467 fBreak = false;
468 G4int A = targetNucleus.GetA_asInt(), iTer(0), iTerMax(100);
469 G4int Z = targetNucleus.GetZ_asInt();
470 G4double e3(0.), pMu2(0.), pX2(0.), nMom(0.), rM(0.), hM(0.), tM = targetNucleus.AtomicMass(A,Z);
471 G4double cost(1.), sint(0.), phi(0.), muMom(0.);
472 G4ThreeVector eP, bst;
473 const G4HadProjectile* aParticle = &aTrack;
474 G4LorentzVector lvp1 = aParticle->Get4Momentum();
475 nMom = NucleonMomentum( targetNucleus );
476
477 if( A == 1 || nMom == 0. ) // hydrogen, no Fermi motion ???
478 {
479 fNuEnergy = aParticle->GetTotalEnergy();
480 iTer = 0;
481
482 do
483 {
484 fXsample = SampleXkr(fNuEnergy);
485 fQtransfer = SampleQkr(fNuEnergy, fXsample);
486 fQ2 = fQtransfer*fQtransfer;
487
488 if( fXsample > 0. )
489 {
490 fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
491 fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
492 }
493 else
494 {
495 fW2 = fM1*fM1;
496 fEmu = fNuEnergy;
497 }
498 e3 = fNuEnergy + fM1 - fEmu;
499
500 // if( e3 < sqrt(fW2) ) G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl; // vmg ~10^-5 for NC
501
502 pMu2 = fEmu*fEmu - fMnumu*fMnumu;
503 pX2 = e3*e3 - fW2;
504
505 fCosTheta = fNuEnergy*fNuEnergy + pMu2 - pX2;
506 fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
507 iTer++;
508 }
509 while( ( abs(fCosTheta) > 1. || fEmu < fMnumu ) && iTer < iTerMax );
510
511 if( iTer >= iTerMax ) { fBreak = true; return; }
512
513 if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
514 {
515 G4cout<<"H2: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
516 // fCosTheta = -1. + 2.*G4UniformRand();
517 if(fCosTheta < -1.) fCosTheta = -1.;
518 if(fCosTheta > 1.) fCosTheta = 1.;
519 }
520 // LVs
521
522 G4LorentzVector lvt1 = G4LorentzVector( 0., 0., 0., fM1 );
523 G4LorentzVector lvsum = lvp1 + lvt1;
524
525 cost = fCosTheta;
526 sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
527 phi = G4UniformRand()*CLHEP::twopi;
528 eP = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
529 muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
530 eP *= muMom;
531 fLVl = G4LorentzVector( eP, fEmu );
532
533 fLVh = lvsum - fLVl;
534 fLVt = G4LorentzVector( 0., 0., 0., 0. ); // no recoil
535 }
536 else // Fermi motion, Q2 in nucleon rest frame
537 {
538 G4ThreeVector nMomDir = nMom*G4RandomDirection();
539
540 if( !f2p2h ) // 1p1h
541 {
542 G4Nucleus recoil(A-1,Z);
543 rM = sqrt( recoil.AtomicMass(A-1,Z)*recoil.AtomicMass(A-1,Z) + nMom*nMom );
544 hM = tM - rM;
545
546 fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
547 fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom ) );
548 }
549 else // 2p2h
550 {
551 G4Nucleus recoil(A-2,Z-1);
552 rM = recoil.AtomicMass(A-2,Z-1)+sqrt(nMom*nMom+fM1*fM1);
553 hM = tM - rM;
554
555 fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
556 fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom ) );
557 }
558 // G4cout<<hM<<", ";
559 // bst = fLVh.boostVector(); // 9-3-20
560
561 // lvp1.boost(-bst); // 9-3-20 -> nucleon rest system, where Q2 transfer is ???
562
563 fNuEnergy = lvp1.e();
564 iTer = 0;
565
566 do
567 {
568 fXsample = SampleXkr(fNuEnergy);
569 fQtransfer = SampleQkr(fNuEnergy, fXsample);
570 fQ2 = fQtransfer*fQtransfer;
571
572 if( fXsample > 0. )
573 {
574 fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
575 fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
576 }
577 else
578 {
579 fW2 = fM1*fM1;
580 fEmu = fNuEnergy;
581 }
582
583 // if(fEmu < 0.) G4cout<<"fEmu = "<<fEmu<<" hM = "<<hM<<G4endl;
584
585 e3 = fNuEnergy + fM1 - fEmu;
586
587 // if( e3 < sqrt(fW2) ) G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl;
588
589 pMu2 = fEmu*fEmu - fMnumu*fMnumu;
590 pX2 = e3*e3 - fW2;
591
592 fCosTheta = fNuEnergy*fNuEnergy + pMu2 - pX2;
593 fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
594 iTer++;
595 }
596 while( ( abs(fCosTheta) > 1. || fEmu < fMnumu ) && iTer < iTerMax );
597
598 if( iTer >= iTerMax ) { fBreak = true; return; }
599
600 if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
601 {
602 G4cout<<"FM: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
603 // fCosTheta = -1. + 2.*G4UniformRand();
604 if(fCosTheta < -1.) fCosTheta = -1.;
605 if(fCosTheta > 1.) fCosTheta = 1.;
606 }
607 // LVs
608 G4LorentzVector lvt1 = G4LorentzVector( 0., 0., 0., fM1 );
609 G4LorentzVector lvsum = lvp1 + lvt1;
610
611 cost = fCosTheta;
612 sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
613 phi = G4UniformRand()*CLHEP::twopi;
614 eP = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
615 muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
616 eP *= muMom;
617 fLVl = G4LorentzVector( eP, fEmu );
618 fLVh = lvsum - fLVl;
619 // back to lab system
620 // fLVl.boost(bst); // 9-3-20
621 // fLVh.boost(bst); // 9-3-20
622 }
623 //G4cout<<iTer<<", "<<fBreak<<"; ";
624 }
625
626 //
627 //
628 ///////////////////////////
629