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26 // $Id: G4NuElNucleusNcModel.cc 91806 2015-08-06 12:20:45Z gcosmo $
27 //
28 // Geant4 Header : G4NuElNucleusNcModel
29 //
30 // Author : V.Grichine 12.2.19
31 //
32
33 #include "G4NuElNucleusNcModel.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 "G4NeutrinoE.hh"
56 // #include "G4AntiNeutrinoMu.hh"
57 #include "G4Nucleus.hh"
58 #include "G4LorentzVector.hh"
59
60 using namespace std;
61 using namespace CLHEP;
62
63 #ifdef G4MULTITHREADED
64 G4Mutex G4NuElNucleusNcModel::numuNucleusModel = G4MUTEX_INITIALIZER;
65 #endif
66
67
68 G4NuElNucleusNcModel::G4NuElNucleusNcModel(const G4String& name)
69 : G4NeutrinoNucleusModel(name)
70 {
71 SetMinEnergy( 0.0*GeV );
72 SetMaxEnergy( 100.*TeV );
73 SetMinEnergy(1.e-6*eV);
74
75 theNuE = G4NeutrinoE::NeutrinoE();
76
77 fMnumu = 0.;
78 fData = fMaster = false;
79 InitialiseModel();
80
81 }
82
83
84 G4NuElNucleusNcModel::~G4NuElNucleusNcModel()
85 {}
86
87
88 void G4NuElNucleusNcModel::ModelDescription(std::ostream& outFile) const
89 {
90
91 outFile << "G4NuElNucleusNcModel is a neutrino-nucleus (neutral current) scattering\n"
92 << "model which uses the standard model \n"
93 << "transfer parameterization. The model is fully relativistic\n";
94
95 }
96
97 /////////////////////////////////////////////////////////
98 //
99 // Read data from G4PARTICLEXSDATA (locally PARTICLEXSDATA)
100
101 void G4NuElNucleusNcModel::InitialiseModel()
102 {
103 G4String pName = "nu_e";
104
105 G4int nSize(0), i(0), j(0), k(0);
106
107 if(!fData)
108 {
109 #ifdef G4MULTITHREADED
110 G4MUTEXLOCK(&numuNucleusModel);
111 if(!fData)
112 {
113 #endif
114 fMaster = true;
115 #ifdef G4MULTITHREADED
116 }
117 G4MUTEXUNLOCK(&numuNucleusModel);
118 #endif
119 }
120
121 if(fMaster)
122 {
123 const char* path = G4FindDataDir("G4PARTICLEXSDATA");
124 std::ostringstream ost1, ost2, ost3, ost4;
125 ost1 << path << "/" << "neutrino" << "/" << pName << "/xarraynckr";
126
127 std::ifstream filein1( ost1.str().c_str() );
128
129 // filein.open("$PARTICLEXSDATA/");
130
131 filein1>>nSize;
132
133 for( k = 0; k < fNbin; ++k )
134 {
135 for( i = 0; i <= fNbin; ++i )
136 {
137 filein1 >> fNuMuXarrayKR[k][i];
138 // G4cout<< fNuMuXarrayKR[k][i] << " ";
139 }
140 }
141 // G4cout<<G4endl<<G4endl;
142
143 ost2 << path << "/" << "neutrino" << "/" << pName << "/xdistrnckr";
144 std::ifstream filein2( ost2.str().c_str() );
145
146 filein2>>nSize;
147
148 for( k = 0; k < fNbin; ++k )
149 {
150 for( i = 0; i < fNbin; ++i )
151 {
152 filein2 >> fNuMuXdistrKR[k][i];
153 // G4cout<< fNuMuXdistrKR[k][i] << " ";
154 }
155 }
156 // G4cout<<G4endl<<G4endl;
157
158 ost3 << path << "/" << "neutrino" << "/" << pName << "/q2arraynckr";
159 std::ifstream filein3( ost3.str().c_str() );
160
161 filein3>>nSize;
162
163 for( k = 0; k < fNbin; ++k )
164 {
165 for( i = 0; i <= fNbin; ++i )
166 {
167 for( j = 0; j <= fNbin; ++j )
168 {
169 filein3 >> fNuMuQarrayKR[k][i][j];
170 // G4cout<< fNuMuQarrayKR[k][i][j] << " ";
171 }
172 }
173 }
174 // G4cout<<G4endl<<G4endl;
175
176 ost4 << path << "/" << "neutrino" << "/" << pName << "/q2distrnckr";
177 std::ifstream filein4( ost4.str().c_str() );
178
179 filein4>>nSize;
180
181 for( k = 0; k < fNbin; ++k )
182 {
183 for( i = 0; i <= fNbin; ++i )
184 {
185 for( j = 0; j < fNbin; ++j )
186 {
187 filein4 >> fNuMuQdistrKR[k][i][j];
188 // G4cout<< fNuMuQdistrKR[k][i][j] << " ";
189 }
190 }
191 }
192 fData = true;
193 }
194 }
195
196 /////////////////////////////////////////////////////////
197
198 G4bool G4NuElNucleusNcModel::IsApplicable(const G4HadProjectile & aPart,
199 G4Nucleus & )
200 {
201 G4bool result = false;
202 G4String pName = aPart.GetDefinition()->GetParticleName();
203 G4double energy = aPart.GetTotalEnergy();
204 fMinNuEnergy = GetMinNuElEnergy();
205
206 if( pName == "nu_e"
207 &&
208 energy > fMinNuEnergy )
209 {
210 result = true;
211 }
212
213 return result;
214 }
215
216 /////////////////////////////////////////// ClusterDecay ////////////////////////////////////////////////////////////
217 //
218 //
219
220 G4HadFinalState* G4NuElNucleusNcModel::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_e" ) aLept = new G4DynamicParticle( theNuE, lv2 );
304 // else if( pName == "anti_nu_mu") aLept = new G4DynamicParticle( theANuMu, 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( theNuE, 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 rM(0.), 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 rM = recoil.AtomicMass(A-1,Z-1);
394
395 fMt = G4ParticleTable::GetParticleTable()->FindParticle(2212)->GetPDGMass()
396 + G4ParticleTable::GetParticleTable()->FindParticle(111)->GetPDGMass();
397 }
398 else // excited neutron
399 {
400 fProton = false;
401 recoil = G4Nucleus(A-1,Z);
402 fRecoil = &recoil;
403 rM = recoil.AtomicMass(A-1,Z);
404
405 fMt = G4ParticleTable::GetParticleTable()->FindParticle(2112)->GetPDGMass()
406 + G4ParticleTable::GetParticleTable()->FindParticle(111)->GetPDGMass();
407 }
408 // G4int index = GetEnergyIndex(energy);
409 G4int nepdg = aParticle->GetDefinition()->GetPDGEncoding();
410 G4double qeTotRat; // = GetNuMuQeTotRat(index, energy);
411 qeTotRat = CalculateQEratioA( Z, A, energy, nepdg);
412
413 G4ThreeVector dX = (lvX.vect()).unit();
414 G4double eX = lvX.e(); // excited nucleon
415 G4double mX = sqrt(massX2);
416
417 if( qeTotRat > G4UniformRand() || mX <= fMt ) // || eX <= 1232.*MeV) // QE
418 {
419 fString = false;
420
421 if( fProton )
422 {
423 fPDGencoding = 2212;
424 fMr = proton_mass_c2;
425 recoil = G4Nucleus(A-1,Z-1);
426 fRecoil = &recoil;
427 rM = recoil.AtomicMass(A-1,Z-1);
428 }
429 else
430 {
431 fPDGencoding = 2112;
432 fMr = G4ParticleTable::GetParticleTable()->
433 FindParticle(fPDGencoding)->GetPDGMass(); // 939.5654133*MeV;
434 recoil = G4Nucleus(A-1,Z);
435 fRecoil = &recoil;
436 rM = recoil.AtomicMass(A-1,Z);
437 }
438 G4double eTh = fMr+0.5*(fMr*fMr-mX*mX)/rM;
439
440 if(eX <= eTh) // vmg, very rarely out of kinematics
441 {
442 theParticleChange.SetEnergyChange(energy);
443 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
444 return &theParticleChange;
445 }
446 FinalBarion( lvX, 0, fPDGencoding ); // p(n)+deexcited recoil
447 }
448 else // if ( eX < 9500000.*GeV ) // < 25.*GeV) // < 95.*GeV ) // < 2.5*GeV ) //cluster decay
449 {
450 if ( fProton && pName == "nu_e" ) qB = 1;
451 else if( !fProton && pName == "nu_e" ) qB = 0;
452
453 ClusterDecay( lvX, qB );
454 }
455 return &theParticleChange;
456 }
457
458
459 /////////////////////////////////////////////////////////////////////
460 ////////////////////////////////////////////////////////////////////
461 ///////////////////////////////////////////////////////////////////
462
463 /////////////////////////////////////////////////
464 //
465 // sample x, then Q2
466
467 void G4NuElNucleusNcModel::SampleLVkr(const G4HadProjectile & aTrack, G4Nucleus& targetNucleus)
468 {
469 fBreak = false;
470 G4int A = targetNucleus.GetA_asInt(), iTer(0), iTerMax(100);
471 G4int Z = targetNucleus.GetZ_asInt();
472 G4double e3(0.), pMu2(0.), pX2(0.), nMom(0.), rM(0.), hM(0.), tM = targetNucleus.AtomicMass(A,Z);
473 G4double cost(1.), sint(0.), phi(0.), muMom(0.);
474 G4ThreeVector eP, bst;
475 const G4HadProjectile* aParticle = &aTrack;
476 G4LorentzVector lvp1 = aParticle->Get4Momentum();
477 nMom = NucleonMomentum( targetNucleus );
478
479 if( A == 1 || nMom == 0. ) // hydrogen, no Fermi motion ???
480 {
481 fNuEnergy = aParticle->GetTotalEnergy();
482 iTer = 0;
483
484 do
485 {
486 fXsample = SampleXkr(fNuEnergy);
487 fQtransfer = SampleQkr(fNuEnergy, fXsample);
488 fQ2 = fQtransfer*fQtransfer;
489
490 if( fXsample > 0. )
491 {
492 fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
493 fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
494 }
495 else
496 {
497 fW2 = fM1*fM1;
498 fEmu = fNuEnergy;
499 }
500 e3 = fNuEnergy + fM1 - fEmu;
501
502 // if( e3 < sqrt(fW2) ) G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl; // vmg ~10^-5 for NC
503
504 pMu2 = fEmu*fEmu - fMnumu*fMnumu;
505 pX2 = e3*e3 - fW2;
506
507 fCosTheta = fNuEnergy*fNuEnergy + pMu2 - pX2;
508 fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
509 iTer++;
510 }
511 while( ( abs(fCosTheta) > 1. || fEmu < fMnumu ) && iTer < iTerMax );
512
513 if( iTer >= iTerMax ) { fBreak = true; return; }
514
515 if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
516 {
517 G4cout<<"H2: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
518 // fCosTheta = -1. + 2.*G4UniformRand();
519 if(fCosTheta < -1.) fCosTheta = -1.;
520 if(fCosTheta > 1.) fCosTheta = 1.;
521 }
522 // LVs
523
524 G4LorentzVector lvt1 = G4LorentzVector( 0., 0., 0., fM1 );
525 G4LorentzVector lvsum = lvp1 + lvt1;
526
527 cost = fCosTheta;
528 sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
529 phi = G4UniformRand()*CLHEP::twopi;
530 eP = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
531 muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
532 eP *= muMom;
533 fLVl = G4LorentzVector( eP, fEmu );
534
535 fLVh = lvsum - fLVl;
536 fLVt = G4LorentzVector( 0., 0., 0., 0. ); // no recoil
537 }
538 else // Fermi motion, Q2 in nucleon rest frame
539 {
540 G4ThreeVector nMomDir = nMom*G4RandomDirection();
541
542 if( !f2p2h ) // 1p1h
543 {
544 G4Nucleus recoil(A-1,Z);
545 rM = sqrt( recoil.AtomicMass(A-1,Z)*recoil.AtomicMass(A-1,Z) + nMom*nMom );
546 hM = tM - rM;
547
548 fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
549 fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom ) );
550 }
551 else // 2p2h
552 {
553 G4Nucleus recoil(A-2,Z-1);
554 rM = recoil.AtomicMass(A-2,Z-1)+sqrt(nMom*nMom+fM1*fM1);
555 hM = tM - rM;
556
557 fLVt = G4LorentzVector( nMomDir, sqrt( rM*rM+nMom*nMom ) );
558 fLVh = G4LorentzVector(-nMomDir, sqrt( hM*hM+nMom*nMom ) );
559 }
560 // G4cout<<hM<<", ";
561 // bst = fLVh.boostVector(); // 9-3-20
562
563 // lvp1.boost(-bst); // 9-3-20 -> nucleon rest system, where Q2 transfer is ???
564
565 fNuEnergy = lvp1.e();
566 iTer = 0;
567
568 do
569 {
570 fXsample = SampleXkr(fNuEnergy);
571 fQtransfer = SampleQkr(fNuEnergy, fXsample);
572 fQ2 = fQtransfer*fQtransfer;
573
574 if( fXsample > 0. )
575 {
576 fW2 = fM1*fM1 - fQ2 + fQ2/fXsample; // sample excited hadron mass
577 fEmu = fNuEnergy - fQ2/2./fM1/fXsample;
578 }
579 else
580 {
581 fW2 = fM1*fM1;
582 fEmu = fNuEnergy;
583 }
584
585 // if(fEmu < 0.) G4cout<<"fEmu = "<<fEmu<<" hM = "<<hM<<G4endl;
586
587 e3 = fNuEnergy + fM1 - fEmu;
588
589 // if( e3 < sqrt(fW2) ) G4cout<<"energyX = "<<e3/GeV<<", fW = "<<sqrt(fW2)/GeV<<G4endl;
590
591 pMu2 = fEmu*fEmu - fMnumu*fMnumu;
592 pX2 = e3*e3 - fW2;
593
594 fCosTheta = fNuEnergy*fNuEnergy + pMu2 - pX2;
595 fCosTheta /= 2.*fNuEnergy*sqrt(pMu2);
596 iTer++;
597 }
598 while( ( abs(fCosTheta) > 1. || fEmu < fMnumu ) && iTer < iTerMax );
599
600 if( iTer >= iTerMax ) { fBreak = true; return; }
601
602 if( abs(fCosTheta) > 1.) // vmg: due to big Q2/x values. To be improved ...
603 {
604 G4cout<<"FM: fCosTheta = "<<fCosTheta<<", fEmu = "<<fEmu<<G4endl;
605 // fCosTheta = -1. + 2.*G4UniformRand();
606 if(fCosTheta < -1.) fCosTheta = -1.;
607 if(fCosTheta > 1.) fCosTheta = 1.;
608 }
609 // LVs
610 G4LorentzVector lvt1 = G4LorentzVector( 0., 0., 0., fM1 );
611 G4LorentzVector lvsum = lvp1 + lvt1;
612
613 cost = fCosTheta;
614 sint = std::sqrt( (1.0 - cost)*(1.0 + cost) );
615 phi = G4UniformRand()*CLHEP::twopi;
616 eP = G4ThreeVector( sint*std::cos(phi), sint*std::sin(phi), cost );
617 muMom = sqrt(fEmu*fEmu-fMnumu*fMnumu);
618 eP *= muMom;
619 fLVl = G4LorentzVector( eP, fEmu );
620 fLVh = lvsum - fLVl;
621 // back to lab system
622 // fLVl.boost(bst); // 9-3-20
623 // fLVh.boost(bst); // 9-3-20
624 }
625 //G4cout<<iTer<<", "<<fBreak<<"; ";
626 }
627
628 //
629 //
630 ///////////////////////////
631