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26 // 26 //
27 // << 27 // $Id: G4DiffractiveExcitation.cc,v 1.1 2007/05/25 06:56:53 vuzhinsk Exp $
28 <<
29 // ------------------------------------------- 28 // ------------------------------------------------------------
30 // GEANT 4 class implemetation file 29 // GEANT 4 class implemetation file
31 // 30 //
32 // ---------------- G4DiffractiveExcitati 31 // ---------------- G4DiffractiveExcitation --------------
33 // by Gunter Folger, October 1998. 32 // by Gunter Folger, October 1998.
34 // diffractive Excitation used by strin << 33 // diffractive Excitation used by strings models
35 // Take a projectile and a target << 34 // Take a projectile and a target
36 // excite the projectile and targe << 35 // excite the projectile and target
37 // Essential changed by V. Uzhinsky in Novemb 36 // Essential changed by V. Uzhinsky in November - December 2006
38 // in order to put it in a correspondence wit 37 // in order to put it in a correspondence with original FRITIOF
39 // model. Variant of FRITIOF with nucleon de- 38 // model. Variant of FRITIOF with nucleon de-excitation is implemented.
40 // Other changes by V.Uzhinsky in May 2007 we 39 // Other changes by V.Uzhinsky in May 2007 were introduced to fit
41 // meson-nucleon interactions. Additional cha << 40 // meson-nucleon interactions
42 // were introduced in December 2006. They tre <<
43 // processes more exactly. <<
44 // Correct treatment of the diffraction disso <<
45 // Mass distributions for resonances and uu-d <<
46 // and dd-diquarks suppression in neutrons we <<
47 // ------------------------------------------- 41 // ---------------------------------------------------------------------
48 42
>> 43
49 #include "globals.hh" 44 #include "globals.hh"
50 #include "Randomize.hh" 45 #include "Randomize.hh"
51 #include "G4PhysicalConstants.hh" <<
52 #include "G4SystemOfUnits.hh" <<
53 46
54 #include "G4DiffractiveExcitation.hh" 47 #include "G4DiffractiveExcitation.hh"
55 #include "G4FTFParameters.hh" << 48 #include "G4LorentzRotation.hh"
56 #include "G4ElasticHNScattering.hh" << 49 #include "G4ThreeVector.hh"
57 << 50 #include "G4ParticleDefinition.hh"
58 #include "G4RotationMatrix.hh" <<
59 #include "G4ParticleDefinition.hh" <<
60 #include "G4ParticleTable.hh" <<
61 #include "G4SampleResonance.hh" <<
62 #include "G4VSplitableHadron.hh" 51 #include "G4VSplitableHadron.hh"
63 #include "G4ExcitedString.hh" 52 #include "G4ExcitedString.hh"
64 #include "G4Neutron.hh" <<
65 <<
66 #include "G4Exp.hh" <<
67 #include "G4Log.hh" <<
68 #include "G4Pow.hh" <<
69 <<
70 //#include "G4ios.hh" 53 //#include "G4ios.hh"
71 54
72 //============================================ << 55 G4DiffractiveExcitation::G4DiffractiveExcitation() // Uzhi
73 << 56 {
74 //#define debugFTFexcitation <<
75 //#define debug_heavyHadrons <<
76 <<
77 //============================================ <<
78 <<
79 G4DiffractiveExcitation::G4DiffractiveExcitati <<
80 <<
81 <<
82 //============================================ <<
83 <<
84 G4DiffractiveExcitation::~G4DiffractiveExcitat <<
85 <<
86 <<
87 //============================================ <<
88 <<
89 G4bool G4DiffractiveExcitation::ExciteParticip <<
90 <<
91 <<
92 <<
93 <<
94 #ifdef debugFTFexcitation <<
95 G4cout << G4endl << "FTF ExciteParticipants <<
96 #endif <<
97 <<
98 CommonVariables common; <<
99 <<
100 // Projectile parameters <<
101 common.Pprojectile = projectile->Get4Momentu <<
102 if ( common.Pprojectile.z() < 0.0 ) return f <<
103 common.ProjectilePDGcode = projectile->GetDe <<
104 common.absProjectilePDGcode = std::abs( comm <<
105 common.M0projectile = projectile->GetDefinit <<
106 G4double ProjectileRapidity = common.Pprojec <<
107 <<
108 // Target parameters <<
109 common.Ptarget = target->Get4Momentum(); <<
110 common.TargetPDGcode = target->GetDefinition <<
111 common.absTargetPDGcode = std::abs( common.T <<
112 common.M0target = target->GetDefinition()->G <<
113 G4double TargetRapidity = common.Ptarget.rap <<
114 <<
115 // Kinematical properties of the interaction <<
116 G4LorentzVector Psum = common.Pprojectile + <<
117 common.S = Psum.mag2(); <<
118 common.SqrtS = std::sqrt( common.S ); <<
119 <<
120 // Check off-shellness of the participants <<
121 G4bool toBePutOnMassShell = true; //Uzhi Au <<
122 common.MminProjectile = common.BrW.GetMinimu <<
123 /* Uzhi Aug.2019 <<
124 if ( common.M0projectile < common.MminProjec <<
125 toBePutOnMassShell = true; <<
126 common.M0projectile = common.BrW.SampleMas <<
127 <<
128 <<
129 } <<
130 */ <<
131 common.M0projectile2 = common.M0projectile * <<
132 common.ProjectileDiffStateMinMass = thePa <<
133 common.ProjectileNonDiffStateMinMass = thePa <<
134 if ( common.M0projectile > common.Projectile <<
135 common.ProjectileDiffStateMinMass = com <<
136 common.ProjectileNonDiffStateMinMass = com <<
137 if ( common.absProjectilePDGcode > 3000 ) <<
138 common.ProjectileDiffStateMinMass += <<
139 common.ProjectileNonDiffStateMinMass += <<
140 } <<
141 } <<
142 common.MminTarget = common.BrW.GetMinimumMas <<
143 /* Uzhi Aug.2019 <<
144 if ( common.M0target < common.MminTarget ) { <<
145 toBePutOnMassShell = true; <<
146 common.M0target = common.BrW.SampleMass( t <<
147 t <<
148 + <<
149 } <<
150 */ <<
151 common.M0target2 = common.M0target * common. <<
152 common.TargetDiffStateMinMass = theParame <<
153 common.TargetNonDiffStateMinMass = theParame <<
154 if ( common.M0target > common.TargetDiffStat <<
155 common.TargetDiffStateMinMass = common. <<
156 common.TargetNonDiffStateMinMass = common. <<
157 if ( common.absTargetPDGcode > 3000 ) { / <<
158 common.TargetDiffStateMinMass += 140. <<
159 common.TargetNonDiffStateMinMass += 140. <<
160 } <<
161 }; <<
162 #ifdef debugFTFexcitation <<
163 G4cout << "Proj Targ PDGcodes " << common.Pr <<
164 << "Mprojectile Y " << common.Pproje <<
165 << "M0projectile Y " << common.M0proj <<
166 G4cout << "Mtarget Y " << common.Ptarge <<
167 << "M0target Y " << common.M0targ <<
168 G4cout << "Pproj " << common.Pprojectile << <<
169 #endif <<
170 <<
171 // Transform momenta to cms and then rotate <<
172 common.toCms = G4LorentzRotation( -1 * Psum. <<
173 G4LorentzVector Ptmp = common.toCms * common <<
174 if ( Ptmp.pz() <= 0.0 ) return false; // "S <<
175 common.toCms.rotateZ( -1*Ptmp.phi() ); <<
176 common.toCms.rotateY( -1*Ptmp.theta() ); <<
177 common.toLab = common.toCms.inverse(); <<
178 common.Pprojectile.transform( common.toCms ) <<
179 common.Ptarget.transform( common.toCms ); <<
180 <<
181 G4double SumMasses = common.M0projectile + c <<
182 #ifdef debugFTFexcitation <<
183 G4cout << "SqrtS " << common.SqrtS << G4 <<
184 << " " << common.M0target << " " << S <<
185 #endif <<
186 if ( common.SqrtS < SumMasses ) return false <<
187 <<
188 common.PZcms2 = ( sqr( common.S ) + sqr( com <<
189 - 2.0 * ( common.S * ( com <<
190 + common.M0proje <<
191 #ifdef debugFTFexcitation <<
192 G4cout << "PZcms2 after toBePutOnMassShell " <<
193 #endif <<
194 if ( common.PZcms2 < 0.0 ) return false; // <<
195 <<
196 common.PZcms = std::sqrt( common.PZcms2 ); <<
197 if ( toBePutOnMassShell ) { <<
198 if ( common.Pprojectile.z() > 0.0 ) { <<
199 common.Pprojectile.setPz( common.PZcms <<
200 common.Ptarget.setPz( -common.PZcms <<
201 } else { <<
202 common.Pprojectile.setPz( -common.PZcms <<
203 common.Ptarget.setPz( common.PZcms <<
204 } <<
205 common.Pprojectile.setE( std::sqrt( common <<
206 + comm <<
207 + comm <<
208 + comm <<
209 common.Ptarget.setE( std::sqrt( common.M0t <<
210 + common.P <<
211 + common.P <<
212 + common.P <<
213 } <<
214 #ifdef debugFTFexcitation <<
215 G4cout << "Start --------------------" << G4 <<
216 << " " << common.ProjectileDiffStateM <<
217 << G4endl <<
218 << "Targ M0 Mdif Mndif " << common.M0 <<
219 << " " << common.TargetNonDiffStateMi <<
220 << "Proj CMS " << common.Pprojectile <<
221 #endif <<
222 <<
223 // Check for possible quark exchange <<
224 ProjectileRapidity = common.Pprojectile.rapi <<
225 TargetRapidity = common.Ptarget.rapidity(); <<
226 G4double QeNoExc = theParameters->GetProcPro <<
227 G4double QeExc = theParameters->GetProcPro <<
228 theParameters->GetProcPro <<
229 common.ProbProjectileDiffraction = <<
230 theParameters->GetProcProb( 2, ProjectileR <<
231 common.ProbTargetDiffraction = <<
232 theParameters->GetProcProb( 3, ProjectileR <<
233 common.ProbOfDiffraction = common.ProbProjec <<
234 #ifdef debugFTFexcitation <<
235 G4cout << "Proc Probs " << QeNoExc << " " << <<
236 << common.ProbProjectileDiffraction < <<
237 << "ProjectileRapidity " << Projectil <<
238 #endif <<
239 <<
240 if ( QeNoExc + QeExc + common.ProbProjectile <<
241 QeNoExc = 1.0 - QeExc - common.ProbProject <<
242 } <<
243 if ( QeExc + QeNoExc != 0.0 ) { <<
244 common.ProbExc = QeExc / ( QeExc + QeNoExc <<
245 } <<
246 if ( 1.0 - QeExc - QeNoExc > 0.0 ) { <<
247 common.ProbProjectileDiffraction /= ( 1.0 <<
248 common.ProbTargetDiffraction /= ( 1.0 <<
249 } <<
250 #ifdef debugFTFexcitation <<
251 G4cout << "Proc Probs " << QeNoExc << " " << <<
252 << common.ProbProjectileDiffraction < <<
253 << "ProjectileRapidity " << Projectil <<
254 #endif <<
255 <<
256 // Try out charge exchange <<
257 G4int returnCode = 1; <<
258 if ( G4UniformRand() < QeExc + QeNoExc ) { <<
259 returnCode = ExciteParticipants_doChargeEx <<
260 <<
261 } <<
262 <<
263 G4bool returnResult = false; <<
264 if ( returnCode == 0 ) { <<
265 returnResult = true; // Successfully ende <<
266 } else if ( returnCode == 1 ) { <<
267 <<
268 common.ProbOfDiffraction = common.ProbProj <<
269 #ifdef debugFTFexcitation <<
270 G4cout << "Excitation -------------------- <<
271 << "Proj M0 MdMin MndMin " << commo <<
272 << common.ProjectileDiffStateMinMas <<
273 << G4endl <<
274 << "Targ M0 MdMin MndMin " << commo <<
275 << " " << common.TargetNonDiffState <<
276 << G4endl <<
277 << "Prob: ProjDiff TargDiff + Sum " <<
278 << common.ProbTargetDiffraction << <<
279 #endif <<
280 if ( common.ProbOfDiffraction != 0.0 ) { <<
281 common.ProbProjectileDiffraction /= comm <<
282 } else { <<
283 common.ProbProjectileDiffraction = 0.0; <<
284 } <<
285 #ifdef debugFTFexcitation <<
286 G4cout << "Prob: ProjDiff TargDiff + Sum " <<
287 << common.ProbTargetDiffraction << <<
288 #endif <<
289 common.ProjectileDiffStateMinMass2 = sq <<
290 common.ProjectileNonDiffStateMinMass2 = sq <<
291 common.TargetDiffStateMinMass2 = sq <<
292 common.TargetNonDiffStateMinMass2 = sq <<
293 // Choose between diffraction and non-diff <<
294 if ( G4UniformRand() < common.ProbOfDiffra <<
295 <<
296 returnResult = ExciteParticipants_doDiff <<
297 <<
298 } else { <<
299 <<
300 returnResult = ExciteParticipants_doNonD <<
301 <<
302 } <<
303 if ( returnResult ) { <<
304 common.Pprojectile += common.Qmomentum; <<
305 common.Ptarget -= common.Qmomentum; <<
306 // Transform back and update SplitableHa <<
307 common.Pprojectile.transform( common.toL <<
308 common.Ptarget.transform( common.toLab ) <<
309 #ifdef debugFTFexcitation <<
310 G4cout << "Mproj " << common.Pprojectile <<
311 << G4endl; <<
312 #endif <<
313 projectile->Set4Momentum( common.Pprojec <<
314 target->Set4Momentum( common.Ptarget ); <<
315 projectile->IncrementCollisionCount( 1 ) <<
316 target->IncrementCollisionCount( 1 ); <<
317 } <<
318 } <<
319 <<
320 return returnResult; <<
321 } <<
322 <<
323 //-------------------------------------------- <<
324 <<
325 G4int G4DiffractiveExcitation:: <<
326 ExciteParticipants_doChargeExchange( G4VSplita <<
327 G4VSplita <<
328 G4FTFPara <<
329 G4Elastic <<
330 G4Diffrac <<
331 // First of the three utility methods used o <<
332 // it does the sampling for the charge-excha <<
333 // This method returns an integer code - ins <<
334 // "0" : successfully ended and nothing el <<
335 // "1" : successfully completed, but the w <<
336 // "99" : unsuccessfully ended, nothing els <<
337 G4int returnCode = 99; <<
338 <<
339 G4double DeltaProbAtQuarkExchange = theParam <<
340 G4ParticleDefinition* TestParticle = 0; <<
341 G4double MtestPr = 0.0, MtestTr = 0.0; <<
342 <<
343 #ifdef debugFTFexcitation <<
344 G4cout << "Q exchange ---------------------- <<
345 #endif <<
346 <<
347 // The target hadron is always a nucleon (i. <<
348 // never an antinucleon), therefore only a q <<
349 // exchanged between the projectile hadron a <<
350 // we could get a quark-quark-antiquark syst <<
351 // This implies that any projectile meson or <<
352 // a constituent quark in all cases - can ha <<
353 // hadron. Instead, any projectile anti-bary <<
354 // with a target hadron (because it has only <<
355 // projectile baryons, instead can have char <<
356 <<
357 G4int NewProjCode = 0, NewTargCode = 0, Proj <<
358 // Projectile unpacking <<
359 if ( common.absProjectilePDGcode < 1000 ) { <<
360 UnpackMeson( common.ProjectilePDGcode, Pr <<
361 } else { <<
362 UnpackBaryon( common.ProjectilePDGcode, Pr <<
363 } <<
364 // Target unpacking <<
365 G4int TargQ1 = 0, TargQ2 = 0, TargQ3 = 0; <<
366 UnpackBaryon( common.TargetPDGcode, TargQ1, <<
367 #ifdef debugFTFexcitation <<
368 G4cout << "Proj Quarks " << ProjQ1 << " " << <<
369 << "Targ Quarks " << TargQ1 << " " << <<
370 #endif <<
371 <<
372 // Sampling of exchanged quarks <<
373 G4int ProjExchangeQ = 0, TargExchangeQ = 0; <<
374 if ( common.absProjectilePDGcode < 1000 ) { <<
375 <<
376 G4bool isProjQ1Quark = false; <<
377 ProjExchangeQ = ProjQ2; <<
378 if ( ProjQ1 > 0 ) { // ProjQ1 is a quark <<
379 isProjQ1Quark = true; <<
380 ProjExchangeQ = ProjQ1; <<
381 } <<
382 // Exchange of non-identical quarks is all <<
383 G4int NpossibleStates = 0; <<
384 if ( ProjExchangeQ != TargQ1 ) NpossibleSt <<
385 if ( ProjExchangeQ != TargQ2 ) NpossibleSt <<
386 if ( ProjExchangeQ != TargQ3 ) NpossibleSt <<
387 G4int Nsampled = (G4int)G4RandFlat::shootI <<
388 NpossibleStates = 0; <<
389 if ( ProjExchangeQ != TargQ1 ) { <<
390 if ( ++NpossibleStates == Nsampled ) { <<
391 TargExchangeQ = TargQ1; TargQ1 = ProjE <<
392 isProjQ1Quark ? ProjQ1 = TargExchangeQ <<
393 } <<
394 } <<
395 if ( ProjExchangeQ != TargQ2 ) { <<
396 if ( ++NpossibleStates == Nsampled ) { <<
397 TargExchangeQ = TargQ2; TargQ2 = ProjE <<
398 isProjQ1Quark ? ProjQ1 = TargExchangeQ <<
399 } <<
400 } <<
401 if ( ProjExchangeQ != TargQ3 ) { <<
402 if ( ++NpossibleStates == Nsampled ) { <<
403 TargExchangeQ = TargQ3; TargQ3 = ProjE <<
404 isProjQ1Quark ? ProjQ1 = TargExchangeQ <<
405 } <<
406 } <<
407 #ifdef debugFTFexcitation <<
408 G4cout << "Exchanged Qs in Pr Tr " << Proj <<
409 #endif <<
410 <<
411 G4int aProjQ1 = std::abs( ProjQ1 ), aProjQ <<
412 G4bool ProjExcited = false; <<
413 const G4int maxNumberOfAttempts = 50; <<
414 G4int attempts = 0; <<
415 while ( attempts++ < maxNumberOfAttempts ) <<
416 <<
417 // Determination of a new projectile ID <<
418 G4double ProbSpin0 = 0.5; <<
419 G4double Ksi = G4UniformRand(); <<
420 if ( aProjQ1 == aProjQ2 ) { <<
421 if ( G4UniformRand() < ProbSpin0 ) { <<
422 if ( aProjQ1 < 3 ) { <<
423 NewProjCode = 111; <<
424 if ( Ksi < 0.5 ) { <<
425 NewProjCode = 221; <<
426 if ( Ksi < 0.25 ) { <<
427 NewProjCode = 331; <<
428 } <<
429 } <<
430 } else if ( aProjQ1 == 3 ) { <<
431 NewProjCode = 221; <<
432 if ( Ksi < 0.5 ) { <<
433 NewProjCode = 331; <<
434 } <<
435 } else if ( aProjQ1 == 4 ) { <<
436 NewProjCode = 441; // eta <<
437 } else if ( aProjQ1 == 5 ) { <<
438 NewProjCode = 551; // eta <<
439 } <<
440 } else { <<
441 if ( aProjQ1 < 3 ) { <<
442 NewProjCode = 113; <<
443 if ( Ksi < 0.5 ) { <<
444 NewProjCode = 223; <<
445 } <<
446 } else if ( aProjQ1 == 3 ) { <<
447 NewProjCode = 333; <<
448 } else if ( aProjQ1 == 4 ) { <<
449 NewProjCode = 443; // J/p <<
450 } else if ( aProjQ1 == 5 ) { <<
451 NewProjCode = 553; // Ups <<
452 } <<
453 } <<
454 } else { <<
455 if ( aProjQ1 > aProjQ2 ) { <<
456 NewProjCode = aProjQ1*100 + aProjQ2* <<
457 } else { <<
458 NewProjCode = aProjQ2*100 + aProjQ1* <<
459 } <<
460 } <<
461 #ifdef debugFTFexcitation <<
462 G4cout << "NewProjCode " << NewProjCode <<
463 #endif <<
464 // Decide (with 50% probability) whether <<
465 // but not in the case of charmed and bo <<
466 // there are no excited charmed and bott <<
467 ProjExcited = false; <<
468 if ( aProjQ1 <= 3 && aProjQ2 <= 3 && <<
469 NewProjCode += 2; // Excited meson (J <<
470 ProjExcited = true; <<
471 } <<
472 <<
473 // So far we have used the absolute valu <<
474 // now look at their signed values to se <<
475 G4int value = ProjQ1, absValue = aProjQ1 <<
476 for ( G4int iQ = 0; iQ < 2; ++iQ ) { // <<
477 if ( iQ == 1 ) { <<
478 value = ProjQ2; absValue = aProjQ2; <<
479 } <<
480 if ( absValue == 2 || absValue == 4 <<
481 Qquarks += 2*value/absValue; // u, <<
482 } else { <<
483 Qquarks -= value/absValue; // d, <<
484 } <<
485 } <<
486 // If Qquarks is positive, the sign of N <<
487 // If Qquarks is negative, then the sign <<
488 // If Qquarks is zero, then we need to d <<
489 // 1. If aProjQ1 and aProjQ2 are the sam <<
490 // (because the antiparticle is the s <<
491 // 2. If aProjQ1 and aProjQ2 are not the <<
492 // we have only two possibilities: <<
493 // a. aProjQ1 and aProjQ2 are two dif <<
494 // (s,d) or (b,d), or (b,s). In th <<
495 // is fine (because the heaviest o <<
496 // to be anti-quark belonging to t <<
497 // implies a meson with positive P <<
498 // b. aProjQ1 and aProjQ2 are two dif <<
499 // The heaviest of the two (c) has <<
500 // in the projectile, therefore th <<
501 // reverse: 421 -> -421 anti_D0 (c <<
502 if ( Qquarks < 0 || ( Qquarks == 0 && <<
503 NewProjCode *= -1; <<
504 } <<
505 #ifdef debugFTFexcitation <<
506 G4cout << "NewProjCode +2 or 0 " << NewP <<
507 G4cout<<"+++++++++++++++++++++++++++++++ <<
508 G4cout<<ProjQ1<<" "<<ProjQ2<<" "<<Qquark <<
509 G4cout<<"+++++++++++++++++++++++++++++++ <<
510 #endif <<
511 <<
512 // Proj <<
513 TestParticle = G4ParticleTable::GetParti <<
514 if ( ! TestParticle ) continue; <<
515 common.MminProjectile = common.BrW.GetMi <<
516 if ( common.SqrtS - common.M0target < co <<
517 MtestPr = common.BrW.SampleMass( TestPar <<
518 <<
519 #ifdef debugFTFexcitation <<
520 G4cout << "TestParticle Name " << NewPro <<
521 << G4endl <<
522 << "MtestPart MtestPart0 "<<Mtest <<
523 << "M0projectile projectile PDGMa <<
524 << projectile->GetDefinition()->G <<
525 #endif <<
526 <<
527 // Targ <<
528 NewTargCode = NewNucleonId( TargQ1, Targ <<
529 #ifdef debugFTFexcitation <<
530 G4cout << "New TrQ " << TargQ1 << " " << <<
531 << "NewTargCode " << NewTargCode <<
532 #endif <<
533 <<
534 // If the target has not heavy (charm or <<
535 // see whether a Delta isobar can be cre <<
536 if ( TargQ1 <= 3 && TargQ2 <= 3 && T <<
537 if ( TargQ1 != TargQ2 && TargQ1 != T <<
538 if ( G4UniformRand() < 0.5 ) { <<
539 NewTargCode += 2; <<
540 } else if ( G4UniformRand() < 0.75 ) <<
541 NewTargCode = 3122; // Lambda <<
542 } <<
543 } else if ( TargQ1 == TargQ2 && Targ <<
544 NewTargCode += 2; ProjExcited = true <<
545 } else if ( target->GetDefinition()->G <<
546 if ( G4UniformRand() > DeltaProbAtQu <<
547 NewTargCode += 2; ProjExcited = tr <<
548 } <<
549 } else if ( ! ProjExcited && <<
550 G4UniformRand() < DeltaPro <<
551 common.SqrtS > common.M0pr <<
552 G4ParticleTable::GetP <<
553 NewTargCode += 2; // Create Delta i <<
554 } <<
555 } <<
556 <<
557 // Protection against: <<
558 // - Lambda* (i.e. excited Lambda state) <<
559 // - Sigma* (i.e. excited Sigma hyperon <<
560 // - Xi* (i.e. excited Xi hyperon st <<
561 if ( NewTargCode == 3124 || // Lambda <<
562 NewTargCode == 3224 || // Sigma*+ NOT <<
563 NewTargCode == 3214 || // Sigma*0 NOT <<
564 NewTargCode == 3114 || // Sigma*- NOT <<
565 NewTargCode == 3324 || // Xi*0 NOT <<
566 NewTargCode == 3314 ) { // Xi*- NOT <<
567 //G4cout << "G4DiffractiveExcitation::Excite <<
568 // << NewTargCode << G4endl; <<
569 NewTargCode -= 2; // Corresponding ground-s <<
570 } <<
571 <<
572 // Special treatment for charmed and bot <<
573 // so we need to transform them by hand <<
574 #ifdef debug_heavyHadrons <<
575 G4int initialNewTargCode = NewTargCode; <<
576 #endif <<
577 if ( NewTargCode == 4322 ) NewTargC <<
578 else if ( NewTargCode == 4312 ) NewTargC <<
579 else if ( NewTargCode == 5312 ) NewTargC <<
580 else if ( NewTargCode == 5322 ) NewTargC <<
581 #ifdef debug_heavyHadrons <<
582 if ( NewTargCode != initialNewTargCode ) <<
583 G4cout << "G4DiffractiveExcitation::ExcitePa <<
584 << "\t target heavy baryon with pdgCo <<
585 << " into pdgCode=" << NewTargCode << <<
586 } <<
587 #endif <<
588 <<
589 TestParticle = G4ParticleTable::GetParti <<
590 if ( ! TestParticle ) continue; <<
591 #ifdef debugFTFexcitation <<
592 G4cout << "New targ " << NewTargCode << <<
593 #endif <<
594 common.MminTarget = common.BrW.GetMinimu <<
595 if ( common.SqrtS - MtestPr < common.Mmi <<
596 MtestTr = common.BrW.SampleMass( TestPar <<
597 <<
598 if ( common.SqrtS > MtestPr + MtestTr ) <<
599 <<
600 } // End of while loop <<
601 if ( attempts >= maxNumberOfAttempts ) ret <<
602 <<
603 if ( MtestPr >= common.Pprojectile.mag() <<
604 common.M0projectile = MtestPr; <<
605 } <<
606 #ifdef debugFTFexcitation <<
607 G4cout << "M0projectile After check " << c <<
608 #endif <<
609 common.M0projectile2 = common.M0projectile <<
610 common.ProjectileDiffStateMinMass = com <<
611 common.ProjectileNonDiffStateMinMass = com <<
612 if ( MtestTr >= common.Ptarget.mag() || <<
613 common.M0target = MtestTr; <<
614 } <<
615 common.M0target2 = common.M0target * commo <<
616 #ifdef debugFTFexcitation <<
617 G4cout << "New targ M0 M0^2 " << common.M0 <<
618 #endif <<
619 common.TargetDiffStateMinMass = common. <<
620 common.TargetNonDiffStateMinMass = common. <<
621 <<
622 } else { // of the if ( common.absProjectil <<
623 <<
624 // If it is a projectile anti-baryon, no q <<
625 // therefore returns immediately 1 (which <<
626 // needs to be continued"). <<
627 if ( common.ProjectilePDGcode < 0 ) return <<
628 <<
629 // Choose randomly, with equal probability <<
630 // projectile or target hadron for selecti <<
631 G4bool isProjectileExchangedQ = false; <<
632 G4int firstQ = TargQ1, secondQ = <<
633 G4int otherFirstQ = ProjQ1, otherSecondQ = <<
634 if ( G4UniformRand() < 0.5 ) { <<
635 isProjectileExchangedQ = true; <<
636 firstQ = ProjQ1; secondQ = Pro <<
637 otherFirstQ = TargQ1; otherSecondQ = Tar <<
638 } <<
639 // Choose randomly, with equal probability <<
640 // selected (projectile or target) hadron <<
641 G4int exchangedQ = 0; <<
642 G4double Ksi = G4UniformRand(); <<
643 if ( Ksi < 0.333333 ) { <<
644 exchangedQ = firstQ; <<
645 } else if ( 0.333333 <= Ksi && Ksi < 0.6 <<
646 exchangedQ = secondQ; <<
647 } else { <<
648 exchangedQ = thirdQ; <<
649 } <<
650 #ifdef debugFTFexcitation <<
651 G4cout << "Exchange Qs isProjectile Q " << <<
652 #endif <<
653 // The exchanged quarks (one of the projec <<
654 // are always accepted if they have differ <<
655 // same flavour) they are accepted only wi <<
656 G4double probSame = theParameters->GetProb <<
657 const G4int MaxCount = 100; <<
658 G4int count = 0, otherExchangedQ = 0; <<
659 do { <<
660 if ( exchangedQ != otherFirstQ || G4Un <<
661 otherExchangedQ = otherFirstQ; otherFi <<
662 } else { <<
663 if ( exchangedQ != otherSecondQ || G <<
664 otherExchangedQ = otherSecondQ; othe <<
665 } else { <<
666 if ( exchangedQ != otherThirdQ || <<
667 otherExchangedQ = otherThirdQ; oth <<
668 } <<
669 } <<
670 } <<
671 } while ( otherExchangedQ == 0 && ++coun <<
672 if ( count >= MaxCount ) return returnCode <<
673 // Swap (between projectile and target had <<
674 // as "exchanged" quarks. <<
675 if ( Ksi < 0.333333 ) { <<
676 firstQ = exchangedQ; <<
677 } else if ( 0.333333 <= Ksi && Ksi < 0.6 <<
678 secondQ = exchangedQ; <<
679 } else { <<
680 thirdQ = exchangedQ; <<
681 } <<
682 if ( isProjectileExchangedQ ) { <<
683 ProjQ1 = firstQ; ProjQ2 = secondQ; <<
684 TargQ1 = otherFirstQ; TargQ2 = otherSeco <<
685 } else { <<
686 TargQ1 = firstQ; TargQ2 = secondQ; <<
687 ProjQ1 = otherFirstQ; ProjQ2 = otherSeco <<
688 } <<
689 #ifdef debugFTFexcitation <<
690 G4cout << "Exchange Qs Pr Tr " << ( isPro <<
691 << " " << ( isProjectileExchangedQ <<
692 #endif <<
693 <<
694 NewProjCode = NewNucleonId( ProjQ1, ProjQ2 <<
695 NewTargCode = NewNucleonId( TargQ1, TargQ2 <<
696 // Decide whether the new projectile hadro <<
697 // then decide whether the new target hadr <<
698 // Notice that a Delta particle has the la <<
699 // whereas a nucleon has "2" (because its <<
700 // If the new projectile hadron or the new <<
701 // constituent quark, then skip this part <<
702 // excited charm and bottom hadrons). <<
703 for ( G4int iHadron = 0; iHadron < 2; iHad <<
704 // First projectile hadron, then target <<
705 G4int codeQ1 = ProjQ1, codeQ2 = ProjQ2, <<
706 G4double massConstraint = common.M0targe <<
707 G4bool isHadronADelta = ( projectile->Ge <<
708 if ( iHadron == 1 ) { // Target hadron <<
709 codeQ1 = TargQ1, codeQ2 = TargQ2, code <<
710 massConstraint = common.M0projectile; <<
711 isHadronADelta = ( target->GetDefiniti <<
712 } <<
713 if ( codeQ1 > 3 || codeQ2 > 3 || cod <<
714 if ( codeQ1 == codeQ2 && codeQ1 == cod <<
715 newHadCode += 2; // Delta++ (uuu) or <<
716 } else if ( isHadronADelta ) { // Hadro <<
717 if ( G4UniformRand() > DeltaProbAtQuar <<
718 newHadCode += 2; // Delta+ (uud) or <<
719 } else { <<
720 newHadCode += 0; // No delta (so th <<
721 } <<
722 } else { // Hadron (projectile or targe <<
723 if ( G4UniformRand() < DeltaProbAtQuar <<
724 common.SqrtS > G4ParticleTable::G <<
725 + massConstraint ) <<
726 newHadCode += 2; // Delta+ (uud) or <<
727 } else { <<
728 newHadCode += 0; // No delta (so th <<
729 } <<
730 } <<
731 if ( iHadron == 0 ) { // Projectile had <<
732 NewProjCode = newHadCode; <<
733 } else { // Target hadron <<
734 NewTargCode = newHadCode; <<
735 } <<
736 } <<
737 #ifdef debugFTFexcitation <<
738 G4cout << "NewProjCode NewTargCode " << Ne <<
739 #endif <<
740 <<
741 // Protection against: <<
742 // - Lambda* (i.e. excited Lambda state) <<
743 // - Sigma* (i.e. excited Sigma hyperon s <<
744 // - Xi* (i.e. excited Xi hyperon stat <<
745 if ( NewProjCode == 3124 || // Lambda* <<
746 NewProjCode == 3224 || // Sigma*+ NOT ex <<
747 NewProjCode == 3214 || // Sigma*0 NOT ex <<
748 NewProjCode == 3114 || // Sigma*- NOT ex <<
749 NewProjCode == 3324 || // Xi*0 NOT ex <<
750 NewProjCode == 3314 ) { // Xi*- NOT ex <<
751 //G4cout << "G4DiffractiveExcitation::Ex <<
752 // << NewProjCode << G4endl; <<
753 NewProjCode -= 2; // Corresponding grou <<
754 } <<
755 if ( NewTargCode == 3124 || // Lambda* <<
756 NewTargCode == 3224 || // Sigma*+ NOT ex <<
757 NewTargCode == 3214 || // Sigma*0 NOT ex <<
758 NewTargCode == 3114 || // Sigma*- NOT ex <<
759 NewTargCode == 3324 || // Xi*0 NOT ex <<
760 NewTargCode == 3314 ) { // Xi*- NOT ex <<
761 //G4cout << "G4DiffractiveExcitation::Ex <<
762 // << NewTargCode << G4endl; <<
763 NewTargCode -= 2; // Corresponding grou <<
764 } <<
765 <<
766 // Special treatment for charmed and botto <<
767 // so we need to transform them by hand to <<
768 #ifdef debug_heavyHadrons <<
769 G4int initialNewProjCode = NewProjCode, in <<
770 #endif <<
771 if ( NewProjCode == 4322 ) NewProjCod <<
772 else if ( NewProjCode == 4312 ) NewProjCod <<
773 else if ( NewProjCode == 5312 ) NewProjCod <<
774 else if ( NewProjCode == 5322 ) NewProjCod <<
775 if ( NewTargCode == 4322 ) NewTargCod <<
776 else if ( NewTargCode == 4312 ) NewTargCod <<
777 else if ( NewTargCode == 5312 ) NewTargCod <<
778 else if ( NewTargCode == 5322 ) NewTargCod <<
779 #ifdef debug_heavyHadrons <<
780 if ( NewProjCode != initialNewProjCode || <<
781 G4cout << "G4DiffractiveExcitation::Exci <<
782 << "\t heavy baryon into an exist <<
783 if ( NewProjCode != initialNewProjCode ) <<
784 G4cout << "\t \t projectile baryon with pdgC <<
785 << " into pdgCode=" << NewProjCode << <<
786 } <<
787 if ( NewTargCode != initialNewTargCode ) <<
788 G4cout << "\t \t target baryon with pd <<
789 << " into pdgCode=" << NewTargCode << <<
790 } <<
791 } <<
792 #endif <<
793 <<
794 // Sampling of the masses of the projectil <<
795 // Because of energy conservation, the ord <<
796 // randomly, half of the time we sample fi <<
797 // then the projectile nucleon mass, and t <<
798 // sample first the projectile nucleon mas <<
799 G4VSplitableHadron* firstHadron = target; <<
800 G4VSplitableHadron* secondHadron = project <<
801 G4int firstHadronCode = NewTargCode, secon <<
802 G4double massConstraint = common.M0project <<
803 G4bool isFirstTarget = true; <<
804 if ( G4UniformRand() < 0.5 ) { <<
805 // Sample first the projectile nucleon m <<
806 firstHadron = projectile; secondHa <<
807 firstHadronCode = NewProjCode; secondHa <<
808 massConstraint = common.M0target; <<
809 isFirstTarget = false; <<
810 } <<
811 G4double Mtest1st = 0.0, Mtest2nd = 0.0, M <<
812 for ( int iSamplingCase = 0; iSamplingCase <<
813 G4VSplitableHadron* aHadron = firstHadro <<
814 G4int aHadronCode = firstHadronCode; <<
815 if ( iSamplingCase == 1 ) { // Second n <<
816 aHadron = secondHadron; aHadronCode = <<
817 } <<
818 G4double MtestHadron = 0.0, MminHadron = <<
819 if ( aHadron->GetStatus() == 1 || aHad <<
820 TestParticle = G4ParticleTable::GetPar <<
821 if ( ! TestParticle ) return returnCod <<
822 MminHadron = common.BrW.GetMinimumMass <<
823 if ( common.SqrtS - massConstraint < M <<
824 if ( TestParticle->GetPDGWidth() == 0. <<
825 MtestHadron = common.BrW.SampleMass( <<
826 } else { <<
827 const G4int maxNumberOfAttempts = 50 <<
828 G4int attempts = 0; <<
829 while ( attempts < maxNumberOfAttemp <<
830 attempts++; <<
831 MtestHadron = common.BrW.SampleMas <<
832 <<
833 if ( common.SqrtS < MtestHadron + <<
834 continue; // Kinematically unac <<
835 } else { <<
836 break; // Kinematically acce <<
837 } <<
838 } <<
839 if ( attempts >= maxNumberOfAttempts <<
840 } <<
841 } <<
842 if ( iSamplingCase == 0 ) { <<
843 Mtest1st = MtestHadron; Mmin1st = Mmi <<
844 } else { <<
845 Mtest2nd = MtestHadron; Mmin2nd = Mmi <<
846 } <<
847 } // End for loop on the two sampling cas <<
848 if ( isFirstTarget ) { <<
849 MtestTr = Mtest1st; MtestPr = Mtest2n <<
850 common.MminTarget = Mmin1st; common.Mmi <<
851 } else { <<
852 MtestTr = Mtest2nd; MtestPr = Mtest1s <<
853 common.MminTarget = Mmin2nd; common.Mmi <<
854 } <<
855 <<
856 if ( MtestPr != 0.0 ) { <<
857 common.M0projectile = MtestPr; <<
858 common.M0projectile2 = common.M0projecti <<
859 common.ProjectileDiffStateMinMass = c <<
860 common.ProjectileNonDiffStateMinMass = c <<
861 } <<
862 if ( MtestTr != 0.0 ) { <<
863 common.M0target = MtestTr; <<
864 common.M0target2 = common.M0target * com <<
865 common.TargetDiffStateMinMass = commo <<
866 common.TargetNonDiffStateMinMass = commo <<
867 } <<
868 <<
869 } // End of if ( common.absProjectilePDGcod <<
870 <<
871 // If we assume that final state hadrons aft <<
872 // in the ground states, we have to put <<
873 if ( common.SqrtS < common.M0projectile + co <<
874 <<
875 common.PZcms2 = ( sqr( common.S ) + sqr( com <<
876 - 2.0 * ( common.S * ( com <<
877 + common.M0proje <<
878 #ifdef debugFTFexcitation <<
879 G4cout << "At the end// NewProjCode " << New <<
880 << "At the end// NewTargCode " << New <<
881 << "M0pr M0tr SqS " << common.M0pro <<
882 << common.SqrtS << G4endl <<
883 << "M0pr2 M0tr2 SqS " << common.M0pro <<
884 << common.SqrtS << G4endl <<
885 << "PZcms2 after the change " << comm <<
886 #endif <<
887 if ( common.PZcms2 < 0.0 ) return returnCode <<
888 <<
889 projectile->SetDefinition( G4ParticleTable:: <<
890 target->SetDefinition( G4ParticleTable::GetP <<
891 common.PZcms = std::sqrt( common.PZcms2 ); <<
892 common.Pprojectile.setPz( common.PZcms ); <<
893 common.Pprojectile.setE( std::sqrt( common.M <<
894 common.Ptarget.setPz( -common.PZcms ); <<
895 common.Ptarget.setE( std::sqrt( common.M0tar <<
896 #ifdef debugFTFexcitation <<
897 G4cout << "Proj Targ and Proj+Targ in CMS" < <<
898 << common.Ptarget << G4endl << common <<
899 #endif <<
900 <<
901 if ( projectile->GetStatus() != 0 ) projecti <<
902 if ( target->GetStatus() != 0 ) target-> <<
903 <<
904 // Check for possible excitation of the part <<
905 if ( common.SqrtS < common.M0projectile + co <<
906 common.SqrtS < common.ProjectileDiffSta <<
907 common.ProbOfDiffraction == 0.0 ) commo <<
908 <<
909 if ( G4UniformRand() > common.ProbExc ) { / <<
910 #ifdef debugFTFexcitation <<
911 G4cout << "Make elastic scattering of new <<
912 #endif <<
913 common.Pprojectile.transform( common.toLab <<
914 common.Ptarget.transform( common.toLab ); <<
915 projectile->Set4Momentum( common.Pprojecti <<
916 target->Set4Momentum( common.Ptarget ); <<
917 G4bool Result = theElastic->ElasticScatter <<
918 #ifdef debugFTFexcitation <<
919 G4cout << "Result of el. scatt " << Result <<
920 << G4endl << projectile->Get4Moment <<
921 << projectile->Get4Momentum() + tar <<
922 << (projectile->Get4Momentum() + ta <<
923 #endif <<
924 if ( Result ) returnCode = 0; // successf <<
925 return returnCode; <<
926 } <<
927 <<
928 #ifdef debugFTFexcitation <<
929 G4cout << "Make excitation of new hadrons" < <<
930 #endif <<
931 <<
932 // Redefinition of ProbOfDiffraction because <<
933 common.ProbOfDiffraction = common.ProbProjec <<
934 if ( common.ProbOfDiffraction != 0.0 ) { <<
935 common.ProbProjectileDiffraction /= common <<
936 common.ProbTargetDiffraction /= common <<
937 } <<
938 <<
939 return returnCode = 1; // successfully comp <<
940 } 57 }
941 58
942 //-------------------------------------------- <<
943 <<
944 G4bool G4DiffractiveExcitation:: <<
945 ExciteParticipants_doDiffraction( G4VSplitable <<
946 G4FTFParamet <<
947 G4Diffractiv <<
948 // Second of the three utility methods used <<
949 // it does the sampling for the diffraction <<
950 <<
951 G4bool isProjectileDiffraction = false; <<
952 if ( G4UniformRand() < common.ProbProjectile <<
953 isProjectileDiffraction = true; <<
954 #ifdef debugFTFexcitation <<
955 G4cout << "projectile diffraction" << G4en <<
956 #endif <<
957 common.ProjMassT2 = common.ProjectileDiffS <<
958 common.ProjMassT = common.ProjectileDiffS <<
959 common.TargMassT2 = common.M0target2; <<
960 common.TargMassT = common.M0target; <<
961 } else { <<
962 #ifdef debugFTFexcitation <<
963 G4cout << "Target diffraction" << G4endl; <<
964 #endif <<
965 common.ProjMassT2 = common.M0projectile2; <<
966 common.ProjMassT = common.M0projectile; <<
967 common.TargMassT2 = common.TargetDiffState <<
968 common.TargMassT = common.TargetDiffState <<
969 } <<
970 <<
971 // Check whether the interaction is possible <<
972 if ( common.SqrtS < common.ProjMassT + commo <<
973 <<
974 common.PZcms2 = ( sqr( common.S ) + sqr( com <<
975 - 2.0 * ( common.S * ( com <<
976 + common.ProjMassT2 <<
977 if ( common.PZcms2 < 0.0 ) return false; <<
978 common.maxPtSquare = common.PZcms2; <<
979 <<
980 G4double DiffrAveragePt2 = theParameters->Ge <<
981 G4bool loopCondition = true; <<
982 G4int whilecount = 0; <<
983 do { // Generate pt and mass of projectile <<
984 <<
985 whilecount++; <<
986 if ( whilecount > 1000 ) { <<
987 common.Qmomentum = G4LorentzVector( 0.0, <<
988 return false; // Ignore this interacti <<
989 }; <<
990 <<
991 common.Qmomentum = G4LorentzVector( Gaussi <<
992 common.Pt2 = G4ThreeVector( common.Qmoment <<
993 if ( isProjectileDiffraction ) { // proje <<
994 common.ProjMassT2 = common.ProjectileDif <<
995 common.TargMassT2 = common.M0target2 + c <<
996 } else { // targe <<
997 common.ProjMassT2 = common.M0projectile2 <<
998 common.TargMassT2 = common.TargetDiffSta <<
999 } <<
1000 common.ProjMassT = std::sqrt( common.Proj <<
1001 common.TargMassT = std::sqrt( common.Targ <<
1002 if ( common.SqrtS < common.ProjMassT + co <<
1003 <<
1004 common.PZcms2 = ( sqr( common.S ) + sqr( <<
1005 - 2.0 * ( common.S * ( <<
1006 + common.Proj <<
1007 if ( common.PZcms2 < 0.0 ) continue; <<
1008 <<
1009 common.PZcms = std::sqrt( common.PZcms2 ) <<
1010 if ( isProjectileDiffraction ) { // proj <<
1011 common.PMinusMin = std::sqrt( common.Pr <<
1012 common.PMinusMax = common.SqrtS - commo <<
1013 common.PMinusNew = ChooseP( common.PMin <<
1014 common.TMinusNew = common.SqrtS - commo <<
1015 common.Qminus = common.Ptarget.minus() <<
1016 common.TPlusNew = common.TargMassT2 / c <<
1017 common.Qplus = common.Ptarget.plus() - <<
1018 common.Qmomentum.setPz( (common.Qplus - <<
1019 common.Qmomentum.setE( (common.Qplus + <<
1020 loopCondition = ( ( common.Pprojectile <<
1021 common.ProjectileDiff <<
1022 } else { // targ <<
1023 common.TPlusMin = std::sqrt( common.Tar <<
1024 common.TPlusMax = common.SqrtS - common <<
1025 common.TPlusNew = ChooseP( common.TPlus <<
1026 common.PPlusNew = common.SqrtS - common <<
1027 common.Qplus = common.PPlusNew - common <<
1028 common.PMinusNew = common.ProjMassT2 / <<
1029 common.Qminus = common.PMinusNew - comm <<
1030 common.Qmomentum.setPz( (common.Qplus - <<
1031 common.Qmomentum.setE( (common.Qplus + <<
1032 loopCondition = ( ( common.Ptarget - c <<
1033 common.TargetDiffSta <<
1034 } <<
1035 <<
1036 } while ( loopCondition ); /* Loop checkin <<
1037 // Repeat the sampling because ther <<
1038 <<
1039 if ( isProjectileDiffraction ) { // projec <<
1040 projectile->SetStatus( 0 ); <<
1041 if ( projectile->GetStatus() == 2 ) proje <<
1042 if ( target->GetStatus() == 1 && target <<
1043 } else { // target <<
1044 target->SetStatus( 0 ); <<
1045 } <<
1046 <<
1047 return true; <<
1048 } <<
1049 <<
1050 //------------------------------------------- <<
1051 <<
1052 G4bool G4DiffractiveExcitation:: 59 G4bool G4DiffractiveExcitation::
1053 ExciteParticipants_doNonDiffraction( G4VSplit << 60 ExciteParticipants(G4VSplitableHadron *projectile, G4VSplitableHadron *target) const
1054 G4VSplit << 61 {
1055 G4FTFPar <<
1056 G4Diffra <<
1057 // Third of the three utility methods used <<
1058 // it does the sampling for the non-diffrac <<
1059 <<
1060 #ifdef debugFTFexcitation <<
1061 G4cout << "Non-diffraction process" << G4en <<
1062 #endif <<
1063 <<
1064 // Check whether the interaction is possibl <<
1065 common.ProjMassT2 = common.ProjectileNonDif <<
1066 common.ProjMassT = common.ProjectileNonDif <<
1067 common.TargMassT2 = common.TargetNonDiffSta <<
1068 common.TargMassT = common.TargetNonDiffSta <<
1069 if ( common.SqrtS < common.ProjMassT + comm <<
1070 <<
1071 common.PZcms2 = ( sqr( common.S ) + sqr( co <<
1072 - 2.0 * ( common.S * ( comm <<
1073 + common.ProjMassT2 * <<
1074 common.maxPtSquare = common.PZcms2; <<
1075 <<
1076 G4int whilecount = 0; <<
1077 do { // Generate pt and masses <<
1078 <<
1079 whilecount++; <<
1080 if ( whilecount > 1000 ) { <<
1081 common.Qmomentum = G4LorentzVector( 0.0 <<
1082 return false; // Ignore this interacti <<
1083 }; <<
1084 <<
1085 common.Qmomentum = G4LorentzVector( Gauss <<
1086 <<
1087 common.Pt2 = G4ThreeVector( common.Qmomen <<
1088 common.ProjMassT2 = common.ProjectileNonD <<
1089 common.ProjMassT = std::sqrt( common.Pro <<
1090 common.TargMassT2 = common.TargetNonDiffS <<
1091 common.TargMassT = std::sqrt( common.Tar <<
1092 if ( common.SqrtS < common.ProjMassT + co <<
1093 <<
1094 common.PZcms2 =( sqr( common.S ) + sqr( c <<
1095 - 2.0 * ( common.S * ( c <<
1096 + common.ProjM <<
1097 if ( common.PZcms2 < 0.0 ) continue; <<
1098 <<
1099 common.PZcms = std::sqrt( common.PZcms2 ) <<
1100 common.PMinusMin = std::sqrt( common.Proj <<
1101 common.PMinusMax = common.SqrtS - common. <<
1102 common.TPlusMin = std::sqrt( common.TargM <<
1103 common.TPlusMax = common.SqrtS - common.P <<
1104 <<
1105 if ( G4UniformRand() <= 0.5 ) { // Rando <<
1106 if ( G4UniformRand() < theParameters->G <<
1107 common.PMinusNew = ChooseP( common.PM <<
1108 } else { <<
1109 common.PMinusNew = ( common.PMinusMax <<
1110 } <<
1111 if ( G4UniformRand() < theParameters->G <<
1112 common.TPlusNew = ChooseP( common.TPl <<
1113 } else { <<
1114 common.TPlusNew = ( common.TPlusMax - <<
1115 } <<
1116 } else { <<
1117 if ( G4UniformRand() < theParameters->G <<
1118 common.TPlusNew = ChooseP( common.TPl <<
1119 } else { <<
1120 common.TPlusNew = ( common.TPlusMax - <<
1121 } <<
1122 if ( G4UniformRand() < theParameters->G <<
1123 common.PMinusNew = ChooseP( common.PM <<
1124 } else { <<
1125 common.PMinusNew = ( common.PMinusMax <<
1126 } <<
1127 } <<
1128 <<
1129 common.Qminus = common.PMinusNew - common <<
1130 common.Qplus = -( common.TPlusNew - commo <<
1131 common.Qmomentum.setPz( (common.Qplus - c <<
1132 common.Qmomentum.setE( (common.Qplus + c <<
1133 #ifdef debugFTFexcitation <<
1134 G4cout <<"Sampled: Mpr, MdifPr, Mtr, Mdif <<
1135 << ( common.Pprojectile + common.Q <<
1136 << common.ProjectileNonDiffStateMi <<
1137 << ( common.Ptarget - common.Qmome <<
1138 << common.TargetNonDiffStateMinMas <<
1139 #endif <<
1140 <<
1141 } while ( ( common.Pprojectile + common.Qmo <<
1142 common.ProjectileNonDiffStateMinM <<
1143 ( common.Ptarget - common.Qmoment <<
1144 common.TargetNonDiffStateMinMass2 <<
1145 <<
1146 projectile->SetStatus( 0 ); <<
1147 target->SetStatus( 0 ); <<
1148 return true; <<
1149 } <<
1150 <<
1151 <<
1152 //=========================================== <<
1153 <<
1154 void G4DiffractiveExcitation::CreateStrings( <<
1155 <<
1156 <<
1157 <<
1158 <<
1159 <<
1160 //G4cout << "Create Strings SplitUp " << ha <<
1161 // << "Defin " << hadron->GetDefiniti <<
1162 // << "Defin " << hadron->GetDefiniti <<
1163 <<
1164 G4bool HadronIsString = hadron->IsSplit(); <<
1165 if( ! HadronIsString ) hadron->SplitUp(); <<
1166 <<
1167 G4Parton* start = hadron->GetNextParton(); <<
1168 if ( start == nullptr ) { <<
1169 G4cout << " G4FTFModel::String() Error: N <<
1170 FirstString = 0; SecondString = 0; <<
1171 return; <<
1172 } <<
1173 <<
1174 G4Parton* end = hadron->GetNextParton(); <<
1175 if ( end == nullptr ) { <<
1176 G4cout << " G4FTFModel::String() Error: N <<
1177 FirstString = 0; SecondString = 0; <<
1178 return; <<
1179 } <<
1180 <<
1181 //G4cout << start << " " << start->GetPDGco <<
1182 // << G4endl <<
1183 // << "Create string " << start->GetP <<
1184 <<
1185 if ( HadronIsString ) { <<
1186 if ( isProjectile ) { <<
1187 FirstString = new G4ExcitedString( end, <<
1188 } else { <<
1189 FirstString = new G4ExcitedString( end, <<
1190 } <<
1191 FirstString->SetTimeOfCreation( hadron->G <<
1192 FirstString->SetPosition( hadron->GetPosi <<
1193 SecondString = 0; <<
1194 return; <<
1195 } <<
1196 <<
1197 G4LorentzVector Phadron = hadron->Get4Momen <<
1198 //G4cout << "String mom " << Phadron << G4e <<
1199 G4LorentzVector Pstart( 0.0, 0.0, 0.0, 0.0 <<
1200 G4LorentzVector Pend( 0.0, 0.0, 0.0, 0.0 ); <<
1201 G4LorentzVector Pkink( 0.0, 0.0, 0.0, 0.0 ) <<
1202 G4LorentzVector PkinkQ1( 0.0, 0.0, 0.0, 0.0 <<
1203 G4LorentzVector PkinkQ2( 0.0, 0.0, 0.0, 0.0 <<
1204 <<
1205 G4int PDGcode_startQ = std::abs( start->Get <<
1206 G4int PDGcode_endQ = std::abs( end->Get <<
1207 //G4cout << "PDGcode_startQ " << PDGcode_st <<
1208 <<
1209 G4double Wmin( 0.0 ); <<
1210 if ( isProjectile ) { <<
1211 Wmin = theParameters->GetProjMinDiffMass( <<
1212 } else { <<
1213 Wmin = theParameters->GetTarMinDiffMass() <<
1214 } <<
1215 <<
1216 G4double W = hadron->Get4Momentum().mag(); <<
1217 G4double W2 = W*W; <<
1218 G4double Pt( 0.0 ), x1( 0.0 ), x3( 0.0 ); <<
1219 G4bool Kink = false; <<
1220 <<
1221 if ( ! ( ( start->GetDefinition()->GetParti <<
1222 end->GetDefinition()->GetParti <<
1223 ( start->GetDefinition()->GetParti <<
1224 end->GetDefinition()->GetParti <<
1225 // Kinky strings are allowed only for qq- <<
1226 // Kinky strings are impossible for other <<
1227 // according to the analysis of Pbar P in <<
1228 <<
1229 if ( W > Wmin ) { // Kink is possible <<
1230 if ( hadron->GetStatus() == 0 ) { <<
1231 G4double Pt2kink = theParameters->Get <<
1232 if ( Pt2kink ) { <<
1233 Pt = std::sqrt( Pt2kink * ( G4Pow:: <<
1234 } else { <<
1235 Pt = 0.0; <<
1236 } <<
1237 } else { <<
1238 Pt = 0.0; <<
1239 } <<
1240 <<
1241 if ( Pt > 500.0*MeV ) { <<
1242 G4double Ymax = G4Log( W/2.0/Pt + std <<
1243 G4double Y = Ymax*( 1.0 - 2.0*G4Unifo <<
1244 x1 = 1.0 - Pt/W * G4Exp( Y ); <<
1245 x3 = 1.0 - Pt/W * G4Exp(-Y ); <<
1246 //x2 = 2.0 - x1 - x3; <<
1247 <<
1248 G4double Mass_startQ = 650.0*MeV; <<
1249 if ( PDGcode_startQ < 3 ) Mass_start <<
1250 if ( PDGcode_startQ == 3 ) Mass_start <<
1251 if ( PDGcode_startQ == 4 ) Mass_start <<
1252 if ( PDGcode_startQ == 5 ) Mass_start <<
1253 G4double Mass_endQ = 650.0*MeV; <<
1254 if ( PDGcode_endQ < 3 ) Mass_endQ = <<
1255 if ( PDGcode_endQ == 3 ) Mass_endQ = <<
1256 if ( PDGcode_endQ == 4 ) Mass_endQ = <<
1257 if ( PDGcode_endQ == 5 ) Mass_endQ = <<
1258 <<
1259 G4double P2_1 = W2*x1*x1/4.0 - Mass_e <<
1260 G4double P2_3 = W2*x3*x3/4.0 - Mass_s <<
1261 G4double P2_2 = sqr( (2.0 - x1 - x3)* <<
1262 if ( P2_1 <= 0.0 || P2_3 <= 0.0 ) { <<
1263 Kink = false; <<
1264 } else { <<
1265 G4double P_1 = std::sqrt( P2_1 ); <<
1266 G4double P_2 = std::sqrt( P2_2 ); <<
1267 G4double P_3 = std::sqrt( P2_3 ); <<
1268 G4double CosT12 = ( P2_3 - P2_1 - P <<
1269 G4double CosT13 = ( P2_2 - P2_1 - P <<
1270 <<
1271 if ( std::abs( CosT12 ) > 1.0 || <<
1272 Kink = false; <<
1273 } else { <<
1274 Kink = true; <<
1275 Pt = P_2 * std::sqrt( 1.0 - CosT1 <<
1276 Pstart.setPx( -Pt ); Pstart.setPy <<
1277 Pend.setPx( 0.0 ); Pend.setPy( <<
1278 Pkink.setPx( Pt ); Pkink.setPy( <<
1279 Pstart.setE( x3*W/2.0 ); <<
1280 Pkink.setE( Pkink.vect().mag() ); <<
1281 Pend.setE( x1*W/2.0 ); <<
1282 <<
1283 G4double XkQ = GetQuarkFractionOf <<
1284 if ( Pkink.getZ() > 0.0 ) { <<
1285 if ( XkQ > 0.5 ) { <<
1286 PkinkQ1 = XkQ*Pkink; <<
1287 } else { <<
1288 PkinkQ1 = (1.0 - XkQ)*Pkink; <<
1289 } <<
1290 } else { <<
1291 if ( XkQ > 0.5 ) { <<
1292 PkinkQ1 = (1.0 - XkQ)*Pkink; <<
1293 } else { <<
1294 PkinkQ1 = XkQ*Pkink; <<
1295 } <<
1296 } <<
1297 <<
1298 PkinkQ2 = Pkink - PkinkQ1; <<
1299 // Minimizing Pt1^2+Pt3^2 <<
1300 G4double Cos2Psi = ( sqr(x1) - sq <<
1301 std::sqrt( sqr <<
1302 G4double Psi = std::acos( Cos2Psi <<
1303 <<
1304 G4LorentzRotation Rotate; <<
1305 if ( isProjectile ) { <<
1306 Rotate.rotateY( Psi ); <<
1307 } else { <<
1308 Rotate.rotateY( pi + Psi ); <<
1309 } <<
1310 Rotate.rotateZ( twopi * G4Uniform <<
1311 Pstart *= Rotate; <<
1312 Pkink *= Rotate; <<
1313 PkinkQ1 *= Rotate; <<
1314 PkinkQ2 *= Rotate; <<
1315 Pend *= Rotate; <<
1316 } <<
1317 } // End of if ( P2_1 <= 0.0 || P2 <<
1318 } // End of if ( Pt > 500.0*MeV ) <<
1319 } // End of if ( W > Wmin ) : check for a <<
1320 } // end of qq-q string selection <<
1321 <<
1322 if ( Kink ) { // Kink is possible <<
1323 <<
1324 //G4cout << "Kink is sampled!" << G4endl; <<
1325 std::vector< G4double > QuarkProbabilitie <<
1326 theParameters->GetQuarkProbabilitiesA <<
1327 <<
1328 G4int QuarkInGluon( 1 ); G4double Ksi = G <<
1329 for ( unsigned int Iq = 0; Iq < 3; Iq++ ) <<
1330 //G4cout << "Iq " << Iq << G4endl; <<
1331 if ( Ksi > QuarkProbabilitiesAtGluonSpl <<
1332 } <<
1333 //G4cout << "Last Iq " << QuarkInGluon << <<
1334 G4Parton* Gquark = new G4Parton( QuarkInG <<
1335 G4Parton* Ganti_quark = new G4Parton( -Qu <<
1336 //G4cout << "Lorentz " << G4endl; <<
1337 <<
1338 G4LorentzRotation toCMS( -1 * Phadron.boo <<
1339 G4LorentzRotation toLab( toCMS.inverse() <<
1340 //G4cout << "Pstart " << Pstart << G4endl <<
1341 //G4cout << "Pend " << Pend << G4endl; <<
1342 //G4cout << "Kink1 " <<PkinkQ1<<G4endl; <<
1343 //G4cout << "Kink2 " <<PkinkQ2<<G4endl; <<
1344 //G4cout << "Pstart " << Pstart << G4endl <<
1345 <<
1346 Pstart.transform( toLab ); start->Set4Mo <<
1347 PkinkQ1.transform( toLab ); <<
1348 PkinkQ2.transform( toLab ); <<
1349 Pend.transform( toLab ); end->Set4Mome <<
1350 //G4cout << "Pstart " << Pstart << G4endl <<
1351 //G4cout << "Pend " << Pend << G4endl; <<
1352 //G4cout << "Defin " << hadron->GetDefini <<
1353 //G4cout << "Defin " << hadron->GetDefini <<
1354 <<
1355 //G4int absPDGcode = std::abs( hadron->Ge <<
1356 G4int absPDGcode = 1500; <<
1357 if ( start->GetDefinition()->GetParticleS <<
1358 end->GetDefinition()->GetParticleSub <<
1359 absPDGcode = 110; <<
1360 } <<
1361 //G4cout << "absPDGcode " << absPDGcode < <<
1362 <<
1363 if ( absPDGcode < 1000 ) { // meson <<
1364 if ( isProjectile ) { // Projectile <<
1365 if ( end->GetDefinition()->GetPDGEnco <<
1366 FirstString = new G4ExcitedString( <<
1367 SecondString = new G4ExcitedString( <<
1368 Ganti_quark->Set4Momentum( PkinkQ1 <<
1369 Gquark->Set4Momentum( PkinkQ2 ); <<
1370 } else { // Anti_Quark on the end <<
1371 FirstString = new G4ExcitedString( <<
1372 SecondString = new G4ExcitedString( <<
1373 Gquark->Set4Momentum( PkinkQ1 ); <<
1374 Ganti_quark->Set4Momentum( PkinkQ2 <<
1375 } <<
1376 } else { // Target <<
1377 if ( end->GetDefinition()->GetPDGEnco <<
1378 FirstString = new G4ExcitedString( <<
1379 SecondString = new G4ExcitedString( <<
1380 Ganti_quark->Set4Momentum( PkinkQ2 <<
1381 Gquark->Set4Momentum( PkinkQ1 ); <<
1382 } else { // Anti_Quark on the end <<
1383 FirstString = new G4ExcitedString( <<
1384 SecondString = new G4ExcitedString( <<
1385 Gquark->Set4Momentum( PkinkQ2 ); <<
1386 Ganti_quark->Set4Momentum( PkinkQ1 <<
1387 } <<
1388 } <<
1389 } else { // Baryon/AntiBaryon <<
1390 if ( isProjectile ) { // Projectile <<
1391 if ( end->GetDefinition()->GetParticl <<
1392 end->GetDefinition()->GetPDGEnco <<
1393 FirstString = new G4ExcitedString( <<
1394 SecondString = new G4ExcitedString( <<
1395 Gquark->Set4Momentum( PkinkQ1 ); <<
1396 Ganti_quark->Set4Momentum( PkinkQ2 <<
1397 } else { / <<
1398 FirstString = new G4ExcitedString( <<
1399 SecondString = new G4ExcitedString( <<
1400 Ganti_quark->Set4Momentum( PkinkQ1 <<
1401 Gquark->Set4Momentum( PkinkQ2 ); <<
1402 } <<
1403 } else { // Target <<
1404 if ( end->GetDefinition()->GetParticl <<
1405 end->GetDefinition()->GetPDGEnco <<
1406 Gquark->Set4Momentum( PkinkQ1 ); <<
1407 Ganti_quark->Set4Momentum( PkinkQ2 <<
1408 FirstString = new G4ExcitedString( <<
1409 SecondString = new G4ExcitedString( <<
1410 } else { // Anti_DiQuark on the end <<
1411 FirstString = new G4ExcitedString( <<
1412 SecondString = new G4ExcitedString( <<
1413 Gquark->Set4Momentum( PkinkQ2 ); <<
1414 Ganti_quark->Set4Momentum( PkinkQ1 <<
1415 } <<
1416 } <<
1417 } <<
1418 <<
1419 FirstString->SetTimeOfCreation( hadron->G <<
1420 FirstString->SetPosition( hadron->GetPosi <<
1421 SecondString->SetTimeOfCreation( hadron-> <<
1422 SecondString->SetPosition( hadron->GetPos <<
1423 <<
1424 } else { // Kink is impossible <<
1425 <<
1426 if ( isProjectile ) { <<
1427 FirstString = new G4ExcitedString( end, <<
1428 } else { <<
1429 FirstString = new G4ExcitedString( end, <<
1430 } <<
1431 FirstString->SetTimeOfCreation( hadron->G <<
1432 FirstString->SetPosition( hadron->GetPosi <<
1433 SecondString = 0; <<
1434 // momenta of string ends <<
1435 G4LorentzVector HadronMom = hadron->Get4M <<
1436 G4LorentzVector Pstart1 = G4LorentzVector <<
1437 G4LorentzVector Pend1 = G4LorentzVector <<
1438 G4double Pz = HadronMom.pz(); <<
1439 G4double Eh = HadronMom.e(); <<
1440 G4double Pt2 = sqr( HadronMom.px() ) + sq <<
1441 G4double Mt2 = HadronMom.mt2(); <<
1442 G4double Exp = std::sqrt( sqr(Pz) + ( sqr <<
1443 G4double Pzq = Pz/2.0 - Exp; <<
1444 G4double Eq = std::sqrt( sqr(Pzq) + Pt2 <<
1445 G4double Pzqq = Pz/2.0 + Exp; <<
1446 G4double Eqq = std::sqrt( sqr(Pzqq) + Pt <<
1447 start->Set4Momentum( Pstart1 ); <<
1448 end->Set4Momentum( Pend1 ); <<
1449 Pstart = Pstart1; Pend = Pend1; <<
1450 <<
1451 } // End of "if (Kink)" <<
1452 <<
1453 //G4cout << "Quarks in the string at creati <<
1454 // << " " << FirstString->GetLeftPart <<
1455 // << FirstString << " " << SecondStr <<
1456 <<
1457 #ifdef G4_FTFDEBUG <<
1458 G4cout << " generated string flavors <<
1459 << end->GetPDGcode() << G4endl << " <<
1460 << start->Get4Momentum() << "mass : <<
1461 << " generated string momenta: Diqua <<
1462 << end->Get4Momentum().mag() << G4en <<
1463 << Pstart + Pend << G4endl << " Orig <<
1464 << hadron->Get4Momentum() << " "<<ha <<
1465 #endif <<
1466 <<
1467 return; <<
1468 } <<
1469 <<
1470 <<
1471 //=========================================== <<
1472 <<
1473 G4double G4DiffractiveExcitation::ChooseP( G4 <<
1474 // Choose an x between Xmin and Xmax with P <<
1475 // To be improved... <<
1476 G4double range = Pmax - Pmin; <<
1477 if ( Pmin <= 0.0 || range <= 0.0 ) { <<
1478 G4cout << " Pmin, range : " << Pmin << " <<
1479 throw G4HadronicException( __FILE__, __LI <<
1480 "G4Diffractive <<
1481 } <<
1482 G4double P = Pmin * G4Pow::GetInstance()->p <<
1483 //G4double P = (Pmax - Pmin) * G4UniformRan <<
1484 return P; <<
1485 } <<
1486 <<
1487 62
1488 //=========================================== << 63 G4LorentzVector Pprojectile=projectile->Get4Momentum();
1489 <<
1490 G4ThreeVector G4DiffractiveExcitation::Gaussi <<
1491 // @@ this method is used in FTFModel as w <<
1492 G4double Pt2( 0.0 ); <<
1493 if ( AveragePt2 <= 0.0 ) { <<
1494 Pt2 = 0.0; <<
1495 } else { <<
1496 Pt2 = -AveragePt2 * G4Log( 1.0 + G4Unifor <<
1497 ( G4Ex <<
1498 } <<
1499 G4double Pt = std::sqrt( Pt2 ); <<
1500 G4double phi = G4UniformRand() * twopi; <<
1501 return G4ThreeVector( Pt * std::cos( phi ), <<
1502 } <<
1503 <<
1504 <<
1505 //=========================================== <<
1506 <<
1507 G4double G4DiffractiveExcitation::GetQuarkFra <<
1508 G4double z, yf; <<
1509 const G4int maxNumberOfLoops = 10000; <<
1510 G4int loopCounter = 0; <<
1511 do { <<
1512 z = zmin + G4UniformRand() * (zmax - zmin <<
1513 yf = z*z + sqr(1.0 - z); <<
1514 } while ( ( G4UniformRand() > yf ) && <<
1515 ++loopCounter < maxNumberOfLoops <<
1516 if ( loopCounter >= maxNumberOfLoops ) { <<
1517 z = 0.5*(zmin + zmax); // Just something <<
1518 } <<
1519 return z; <<
1520 } <<
1521 <<
1522 <<
1523 //=========================================== <<
1524 <<
1525 void G4DiffractiveExcitation::UnpackMeson( co <<
1526 G4int absIdPDG = std::abs( IdPDG ); <<
1527 if ( ! ( absIdPDG == 111 || absIdPDG == 221 <<
1528 absIdPDG == 441 || absIdPDG == 443 <<
1529 // All other projectile mesons (including <<
1530 Q1 = absIdPDG / 100; <<
1531 Q2 = (absIdPDG % 100) / 10; <<
1532 G4int anti = 1 - 2 * ( std::max( Q1, Q2 ) <<
1533 if ( IdPDG < 0 ) anti *= -1; <<
1534 Q1 *= anti; <<
1535 Q2 *= -1 * anti; <<
1536 } else { <<
1537 if ( absIdPDG == 441 || absIdPDG == 443 ) <<
1538 Q1 = 4; Q2 = -4; <<
1539 } else if ( absIdPDG == 553 ) { <<
1540 Q1 = 5; Q2 = -5; <<
1541 } else { <<
1542 if ( G4UniformRand() < 0.5 ) { <<
1543 Q1 = 1; Q2 = -1; <<
1544 } else { <<
1545 Q1 = 2; Q2 = -2; <<
1546 } <<
1547 } <<
1548 } <<
1549 return; <<
1550 } <<
1551 <<
1552 <<
1553 //=========================================== <<
1554 <<
1555 void G4DiffractiveExcitation::UnpackBaryon( G <<
1556 G <<
1557 Q1 = IdPDG / 1000; <<
1558 Q2 = (IdPDG % 1000) / 100; <<
1559 Q3 = (IdPDG % 100) / 10; <<
1560 return; <<
1561 } <<
1562 <<
1563 <<
1564 //=========================================== <<
1565 <<
1566 G4int G4DiffractiveExcitation::NewNucleonId( <<
1567 // Order the three integers in such a way t <<
1568 G4int TmpQ( 0 ); <<
1569 if ( Q3 > Q2 ) { <<
1570 TmpQ = Q2; <<
1571 Q2 = Q3; <<
1572 Q3 = TmpQ; <<
1573 } else if ( Q3 > Q1 ) { <<
1574 TmpQ = Q1; <<
1575 Q1 = Q3; <<
1576 Q3 = TmpQ; <<
1577 } <<
1578 if ( Q2 > Q1 ) { <<
1579 TmpQ = Q1; <<
1580 Q1 = Q2; <<
1581 Q2 = TmpQ; <<
1582 } <<
1583 // By now Q1 >= Q2 >= Q3 <<
1584 G4int NewCode = Q1*1000 + Q2*100 + Q3*10 + <<
1585 return NewCode; <<
1586 } <<
1587 <<
1588 <<
1589 //=========================================== <<
1590 <<
1591 G4DiffractiveExcitation::G4DiffractiveExcitat <<
1592 throw G4HadronicException( __FILE__, __LINE <<
1593 "G4DiffractiveEx <<
1594 } <<
1595 <<
1596 <<
1597 //=========================================== <<
1598 <<
1599 const G4DiffractiveExcitation & G4Diffractive <<
1600 throw G4HadronicException( __FILE__, __LINE <<
1601 "G4DiffractiveEx <<
1602 return *this; <<
1603 } <<
1604 <<
1605 <<
1606 //=========================================== <<
1607 <<
1608 G4bool G4DiffractiveExcitation::operator==( c <<
1609 throw G4HadronicException( __FILE__, __LINE <<
1610 "G4DiffractiveEx <<
1611 } <<
1612 64
>> 65 // -------------------- Projectile parameters -----------------------------------
>> 66 G4bool PutOnMassShell=0;
1613 67
1614 //=========================================== << 68 // With de-excitation
1615 << 69 // G4double M0projectile=projectile->GetDefinition()->GetPDGMass();
1616 G4bool G4DiffractiveExcitation::operator!= ( << 70 // Without de-excitation
1617 throw G4HadronicException( __FILE__, __LINE << 71 G4double M0projectile = Pprojectile.mag();
1618 "G4DiffractiveEx << 72
>> 73 if(M0projectile < projectile->GetDefinition()->GetPDGMass())
>> 74 {
>> 75 PutOnMassShell=1;
>> 76 M0projectile=projectile->GetDefinition()->GetPDGMass();
>> 77 }
>> 78
>> 79 G4double Mprojectile2 = M0projectile * M0projectile;
>> 80
>> 81 G4int PDGcode=projectile->GetDefinition()->GetPDGEncoding();
>> 82 G4int absPDGcode=std::abs(PDGcode);
>> 83 G4double ProjectileDiffCut;
>> 84 G4double ProjectileBackgroundWeight; // Uzhi May 2007
>> 85
>> 86 G4double TargetBackgroundWeight; // Uzhi May 2007
>> 87
>> 88 G4double AveragePt2;
>> 89
>> 90 if( absPDGcode > 1000 ) //------Projectile is baryon --------
>> 91 {
>> 92 ProjectileDiffCut = 1.1; // GeV
>> 93 ProjectileBackgroundWeight=0.; // Uzhi May 2007
>> 94 AveragePt2 = 0.3; // GeV^2
>> 95 }
>> 96 else if( absPDGcode == 211 || PDGcode == 111) //------Projectile is Pion -----------
>> 97 {
>> 98 ProjectileDiffCut = 0.6; // GeV Uzhi May 2007 1.0->0.6
>> 99 ProjectileBackgroundWeight=0.9; // Uzhi May 2007
>> 100 AveragePt2 = 0.3; // GeV^2
>> 101 }
>> 102 else if( absPDGcode == 321 || PDGcode == -311) //------Projectile is Kaon -----------
>> 103 {
>> 104 ProjectileDiffCut = 0.7; // GeV 1.1
>> 105 ProjectileBackgroundWeight=0.5; // Uzhi May 2007 ???
>> 106 AveragePt2 = 0.3; // GeV^2
>> 107 }
>> 108 else //------Projectile is undefined,
>> 109 //------Nucleon assumed
>> 110 {
>> 111 ProjectileDiffCut = 1.1; // GeV
>> 112 ProjectileBackgroundWeight=0.; // Uzhi May 2007
>> 113 AveragePt2 = 0.3; // GeV^2
>> 114 };
>> 115
>> 116 ProjectileDiffCut = ProjectileDiffCut * GeV;
>> 117 AveragePt2 = AveragePt2 * GeV*GeV;
>> 118
>> 119 // -------------------- Target parameters ----------------------------------------------
>> 120 G4LorentzVector Ptarget=target->Get4Momentum();
>> 121
>> 122 G4double M0target = Ptarget.mag();
>> 123
>> 124 if(M0target < target->GetDefinition()->GetPDGMass())
>> 125 {
>> 126 PutOnMassShell=1;
>> 127 M0target=target->GetDefinition()->GetPDGMass();
>> 128 }
>> 129
>> 130 G4double Mtarget2 = M0target * M0target; //Ptarget.mag2();
>> 131 // for AA-inter.
>> 132
>> 133 G4double NuclearNucleonDiffCut = 1.1*GeV;
>> 134 TargetBackgroundWeight=0.; // Uzhi May 2007
>> 135
>> 136 G4double ProjectileDiffCut2 = ProjectileDiffCut * ProjectileDiffCut;
>> 137 G4double NuclearNucleonDiffCut2 = NuclearNucleonDiffCut * NuclearNucleonDiffCut;
>> 138
>> 139 // Transform momenta to cms and then rotate parallel to z axis;
>> 140
>> 141 G4LorentzVector Psum;
>> 142 Psum=Pprojectile+Ptarget;
>> 143
>> 144 G4LorentzRotation toCms(-1*Psum.boostVector());
>> 145
>> 146 G4LorentzVector Ptmp=toCms*Pprojectile;
>> 147
>> 148 if ( Ptmp.pz() <= 0. )
>> 149 {
>> 150 // "String" moving backwards in CMS, abort collision !!
>> 151 //G4cout << " abort Collision!! " << G4endl;
>> 152 return false;
>> 153 }
>> 154
>> 155 toCms.rotateZ(-1*Ptmp.phi());
>> 156 toCms.rotateY(-1*Ptmp.theta());
>> 157
>> 158 G4LorentzRotation toLab(toCms.inverse());
>> 159
>> 160 Pprojectile.transform(toCms);
>> 161 Ptarget.transform(toCms);
>> 162
>> 163 G4double Pt2;
>> 164 G4double ProjMassT2, ProjMassT;
>> 165 G4double TargMassT2, TargMassT;
>> 166 G4double PZcms2, PZcms;
>> 167 G4double PMinusNew, TPlusNew;
>> 168
>> 169 G4double S=Psum.mag2();
>> 170 G4double SqrtS=std::sqrt(S);
>> 171
>> 172 if(absPDGcode > 1000 && SqrtS < 2200*MeV)
>> 173 {return false;} // The model cannot work for
>> 174 // p+p-interactions
>> 175 // at Plab < 1.3 GeV/c.
>> 176
>> 177 if(( absPDGcode == 211 || PDGcode == 111) && SqrtS < 1600*MeV)
>> 178 {return false;} // The model cannot work for
>> 179 // Pi+p-interactions
>> 180 // at Plab < 1. GeV/c.
>> 181
>> 182 if(( absPDGcode == 321 || PDGcode == -311) && SqrtS < 1600*MeV)
>> 183 {return false;} // The model cannot work for
>> 184 // K+p-interactions
>> 185 // at Plab < ??? GeV/c. ???
>> 186
>> 187 PZcms2=(S*S+Mprojectile2*Mprojectile2+Mtarget2*Mtarget2-
>> 188 2*S*Mprojectile2-2*S*Mtarget2-2*Mprojectile2*Mtarget2)/4./S;
>> 189 if(PZcms2 < 0)
>> 190 {return false;} // It can be in an interaction with off-shell nuclear nucleon
>> 191
>> 192 PZcms = std::sqrt(PZcms2);
>> 193
>> 194 if(PutOnMassShell)
>> 195 {
>> 196 if(Pprojectile.z() > 0.)
>> 197 {
>> 198 Pprojectile.setPz( PZcms);
>> 199 Ptarget.setPz( -PZcms);
>> 200 }
>> 201 else
>> 202 {
>> 203 Pprojectile.setPz(-PZcms);
>> 204 Ptarget.setPz( PZcms);
>> 205 };
>> 206
>> 207 Pprojectile.setE(std::sqrt(Mprojectile2+
>> 208 Pprojectile.x()*Pprojectile.x()+
>> 209 Pprojectile.y()*Pprojectile.y()+
>> 210 PZcms2));
>> 211 Ptarget.setE(std::sqrt( Mtarget2 +
>> 212 Ptarget.x()*Ptarget.x()+
>> 213 Ptarget.y()*Ptarget.y()+
>> 214 PZcms2));
>> 215 }
>> 216
>> 217 G4double maxPtSquare = PZcms2;
>> 218
>> 219 //G4cout << "Pprojectile aft boost : " << Pprojectile << G4endl;
>> 220 //G4cout << "Ptarget aft boost : " << Ptarget << G4endl;
>> 221 // G4cout << "cms aft boost : " << (Pprojectile+ Ptarget) << G4endl;
>> 222
>> 223 // G4cout << " Projectile Xplus / Xminus : " <<
>> 224 // Pprojectile.plus() << " / " << Pprojectile.minus() << G4endl;
>> 225 // G4cout << " Target Xplus / Xminus : " <<
>> 226 // Ptarget.plus() << " / " << Ptarget.minus() << G4endl;
>> 227
>> 228 G4LorentzVector Qmomentum;
>> 229 G4double Qminus, Qplus;
>> 230
>> 231 G4int whilecount=0;
>> 232 do {
>> 233 // Generate pt
>> 234
>> 235 if (whilecount++ >= 500 && (whilecount%100)==0)
>> 236 // G4cout << "G4DiffractiveExcitation::ExciteParticipants possibly looping"
>> 237 // << ", loop count/ maxPtSquare : "
>> 238 // << whilecount << " / " << maxPtSquare << G4endl;
>> 239 if (whilecount > 1000 )
>> 240 {
>> 241 Qmomentum=G4LorentzVector(0.,0.,0.,0.);
>> 242 return false; // Ignore this interaction
>> 243 }
>> 244
>> 245 Qmomentum=G4LorentzVector(GaussianPt(AveragePt2,maxPtSquare),0);
>> 246
>> 247 //G4cout << "generated Pt " << Qmomentum << G4endl;
>> 248 //G4cout << "Pprojectile with pt : " << Pprojectile+Qmomentum << G4endl;
>> 249 //G4cout << "Ptarget with pt : " << Ptarget-Qmomentum << G4endl;
>> 250
>> 251 // Momentum transfer
>> 252 /* // Uzhi
>> 253 G4double Xmin = minmass / ( Pprojectile.e() + Ptarget.e() );
>> 254 G4double Xmax=1.;
>> 255 G4double Xplus =ChooseX(Xmin,Xmax);
>> 256 G4double Xminus=ChooseX(Xmin,Xmax);
>> 257
>> 258 // G4cout << " X-plus " << Xplus << G4endl;
>> 259 // G4cout << " X-minus " << Xminus << G4endl;
>> 260
>> 261 G4double pt2=G4ThreeVector(Qmomentum.vect()).mag2();
>> 262 G4double Qplus =-1 * pt2 / Xminus/Ptarget.minus();
>> 263 G4double Qminus= pt2 / Xplus /Pprojectile.plus();
>> 264 */ // Uzhi *
>> 265
>> 266 Pt2=G4ThreeVector(Qmomentum.vect()).mag2();
>> 267 ProjMassT2=Mprojectile2+Pt2;
>> 268 ProjMassT =std::sqrt(ProjMassT2);
>> 269
>> 270 TargMassT2=Mtarget2+Pt2;
>> 271 TargMassT =std::sqrt(TargMassT2);
>> 272
>> 273 PZcms2=(S*S+ProjMassT2*ProjMassT2+
>> 274 TargMassT2*TargMassT2-
>> 275 2.*S*ProjMassT2-2.*S*TargMassT2-
>> 276 2.*ProjMassT2*TargMassT2)/4./S;
>> 277 if(PZcms2 < 0 ) {PZcms2=0;};
>> 278 PZcms =std::sqrt(PZcms2);
>> 279
>> 280 G4double PMinusMin=std::sqrt(ProjMassT2+PZcms2)-PZcms;
>> 281 G4double PMinusMax=SqrtS-TargMassT;
>> 282
>> 283 if(G4UniformRand() < ProjectileBackgroundWeight) // Uzhi May 2007
>> 284 {
>> 285 PMinusNew=PMinusMax-(PMinusMax-PMinusMin)*G4UniformRand(); // Uzhi May 2007
>> 286 } // Uzhi May 2007
>> 287 else // Uzhi May 2007
>> 288 { // Uzhi May 2007
>> 289 PMinusNew=ChooseP(PMinusMin, PMinusMax); // Uzhi May 2007
>> 290 }; // Uzhi May 2007
>> 291 // PMinusNew=ChooseP(PMinusMin, PMinusMax); // Uzhi May 2007
>> 292 Qminus=PMinusNew-Pprojectile.minus();
>> 293
>> 294 G4double TPlusMin=std::sqrt(TargMassT2+PZcms2)-PZcms;
>> 295 G4double TPlusMax=SqrtS-PMinusNew; // Uzhi May 2007
>> 296 // G4double TPlusMax=SqrtS-ProjMassT; // Uzhi May 2007
>> 297
>> 298 if(G4UniformRand() < TargetBackgroundWeight) // Uzhi May 2007
>> 299 {
>> 300 TPlusNew=TPlusMax-(TPlusMax-TPlusMin)*G4UniformRand(); // Uzhi May 2007
>> 301 } // Uzhi May 2007
>> 302 else // Uzhi May 2007
>> 303 { // Uzhi May 2007
>> 304 TPlusNew=ChooseP(TPlusMin, TPlusMax); // Uzhi May 2007
>> 305 }; // Uzhi May 2007
>> 306
>> 307 // TPlusNew=ChooseP(TPlusMin, TPlusMax); // Uzhi May 2007
>> 308 Qplus=-(TPlusNew-Ptarget.plus());
>> 309
>> 310 Qmomentum.setPz( (Qplus-Qminus)/2 );
>> 311 Qmomentum.setE( (Qplus+Qminus)/2 );
>> 312
>> 313 //G4cout << "Qplus / Qminus " << Qplus << " / " << Qminus<<G4endl;
>> 314 // G4cout << "pt2" << pt2 << G4endl;
>> 315 // G4cout << "Qmomentum " << Qmomentum << G4endl;
>> 316 // G4cout << " Masses (P/T) : " << (Pprojectile+Qmomentum).mag() <<
>> 317 // " / " << (Ptarget-Qmomentum).mag() << G4endl;
>> 318
>> 319 } while (
>> 320 ( (Pprojectile+Qmomentum).mag2() < Mprojectile2 || // Uzhi No without excitation
>> 321 (Ptarget -Qmomentum).mag2() < Mtarget2 ) || // Uzhi
>> 322 ( (Pprojectile+Qmomentum).mag2() < ProjectileDiffCut2 && // Uzhi No double Diffraction
>> 323 (Ptarget -Qmomentum).mag2() < NuclearNucleonDiffCut2) );// Uzhi
>> 324
>> 325 if((Ptarget-Qmomentum).mag2() < NuclearNucleonDiffCut2) // Uzhi
>> 326 //Projectile diffraction
>> 327 {
>> 328 G4double TMinusNew=SqrtS-PMinusNew;
>> 329 Qminus=Ptarget.minus()-TMinusNew;
>> 330 TPlusNew=TargMassT2/TMinusNew;
>> 331 Qplus=Ptarget.plus()-TPlusNew;
>> 332
>> 333 Qmomentum.setPz( (Qplus-Qminus)/2 );
>> 334 Qmomentum.setE( (Qplus+Qminus)/2 );
>> 335 }
>> 336 else if((Pprojectile+Qmomentum).mag2() < ProjectileDiffCut2) // Uzhi
>> 337 //Target diffraction
>> 338 {
>> 339 G4double PPlusNew=SqrtS-TPlusNew;
>> 340 Qplus=PPlusNew-Pprojectile.plus();
>> 341 PMinusNew=ProjMassT2/PPlusNew;
>> 342 Qminus=PMinusNew-Pprojectile.minus();
>> 343
>> 344 Qmomentum.setPz( (Qplus-Qminus)/2 );
>> 345 Qmomentum.setE( (Qplus+Qminus)/2 );
>> 346 };
>> 347
>> 348 Pprojectile += Qmomentum;
>> 349 Ptarget -= Qmomentum;
>> 350
>> 351 /*
>> 352 Pprojectile.setPz(0.);
>> 353 Pprojectile.setE(SqrtS-M0target);
>> 354
>> 355 Ptarget.setPz(0.);
>> 356 Ptarget.setE(M0target);
>> 357 */
>> 358
>> 359 //G4cout << "Pprojectile with Q : " << Pprojectile << G4endl;
>> 360 //G4cout << "Ptarget with Q : " << Ptarget << G4endl;
>> 361
>> 362 // G4cout << "Projectile back: " << toLab * Pprojectile << G4endl;
>> 363 // G4cout << "Target back: " << toLab * Ptarget << G4endl;
>> 364
>> 365 // Transform back and update SplitableHadron Participant.
>> 366 Pprojectile.transform(toLab);
>> 367 Ptarget.transform(toLab);
>> 368
>> 369 //G4cout << "Pprojectile with Q M: " << Pprojectile<<" "<< Pprojectile.mag() << G4endl;
>> 370 //G4cout << "Ptarget with Q M: " << Ptarget <<" "<< Ptarget.mag() << G4endl;
>> 371
>> 372 //G4cout << "Target mass " << Ptarget.mag() << G4endl;
>> 373
>> 374 target->Set4Momentum(Ptarget);
>> 375
>> 376 //G4cout << "Projectile mass " << Pprojectile.mag() << G4endl;
>> 377
>> 378 projectile->Set4Momentum(Pprojectile);
>> 379
>> 380 return true;
>> 381 }
>> 382
>> 383
>> 384 G4ExcitedString * G4DiffractiveExcitation::
>> 385 String(G4VSplitableHadron * hadron, G4bool isProjectile) const
>> 386 {
>> 387 hadron->SplitUp();
>> 388 G4Parton *start= hadron->GetNextParton();
>> 389 if ( start==NULL)
>> 390 { G4cout << " G4FTFModel::String() Error:No start parton found"<< G4endl;
>> 391 return NULL;
>> 392 }
>> 393 G4Parton *end = hadron->GetNextParton();
>> 394 if ( end==NULL)
>> 395 { G4cout << " G4FTFModel::String() Error:No end parton found"<< G4endl;
>> 396 return NULL;
>> 397 }
>> 398
>> 399 G4ExcitedString * string;
>> 400 if ( isProjectile )
>> 401 {
>> 402 string= new G4ExcitedString(end,start, +1);
>> 403 } else {
>> 404 string= new G4ExcitedString(start,end, -1);
>> 405 }
>> 406
>> 407 string->SetPosition(hadron->GetPosition());
>> 408
>> 409 // momenta of string ends
>> 410 G4double ptSquared= hadron->Get4Momentum().perp2();
>> 411 G4double transverseMassSquared= hadron->Get4Momentum().plus()
>> 412 * hadron->Get4Momentum().minus();
>> 413
>> 414
>> 415 G4double maxAvailMomentumSquared=
>> 416 sqr( std::sqrt(transverseMassSquared) - std::sqrt(ptSquared) );
>> 417
>> 418 G4double widthOfPtSquare = 0.25; // Uzhi <Pt^2>=0.25 ??????????????????
>> 419 G4ThreeVector pt=GaussianPt(widthOfPtSquare,maxAvailMomentumSquared);
>> 420
>> 421 G4LorentzVector Pstart(G4LorentzVector(pt,0.));
>> 422 G4LorentzVector Pend;
>> 423 Pend.setPx(hadron->Get4Momentum().px() - pt.x());
>> 424 Pend.setPy(hadron->Get4Momentum().py() - pt.y());
>> 425
>> 426 G4double tm1=hadron->Get4Momentum().minus() +
>> 427 ( Pend.perp2()-Pstart.perp2() ) / hadron->Get4Momentum().plus();
>> 428
>> 429 G4double tm2= std::sqrt( std::max(0., sqr(tm1) -
>> 430 4. * Pend.perp2() * hadron->Get4Momentum().minus()
>> 431 / hadron->Get4Momentum().plus() ));
>> 432
>> 433 G4int Sign= isProjectile ? -1 : 1;
>> 434
>> 435 G4double endMinus = 0.5 * (tm1 + Sign*tm2);
>> 436 G4double startMinus= hadron->Get4Momentum().minus() - endMinus;
>> 437
>> 438 G4double startPlus= Pstart.perp2() / startMinus;
>> 439 G4double endPlus = hadron->Get4Momentum().plus() - startPlus;
>> 440
>> 441 Pstart.setPz(0.5*(startPlus - startMinus));
>> 442 Pstart.setE(0.5*(startPlus + startMinus));
>> 443
>> 444 Pend.setPz(0.5*(endPlus - endMinus));
>> 445 Pend.setE(0.5*(endPlus + endMinus));
>> 446
>> 447 start->Set4Momentum(Pstart);
>> 448 end->Set4Momentum(Pend);
>> 449
>> 450 #ifdef G4_FTFDEBUG
>> 451 G4cout << " generated string flavors " << start->GetPDGcode() << " / " << end->GetPDGcode() << G4endl;
>> 452 G4cout << " generated string momenta: quark " << start->Get4Momentum() << "mass : " <<start->Get4Momentum().mag()<< G4endl;
>> 453 G4cout << " generated string momenta: Diquark " << end ->Get4Momentum() << "mass : " <<end->Get4Momentum().mag()<< G4endl;
>> 454 G4cout << " sum of ends " << Pstart+Pend << G4endl;
>> 455 G4cout << " Original " << hadron->Get4Momentum() << G4endl;
>> 456 #endif
>> 457
>> 458 return string;
>> 459 }
>> 460
>> 461
>> 462 // --------- private methods ----------------------
>> 463
>> 464 G4double G4DiffractiveExcitation::ChooseP(G4double Pmin, G4double Pmax) const // Uzhi
>> 465 {
>> 466 // choose an x between Xmin and Xmax with P(x) ~ 1/x
>> 467
>> 468 // to be improved...
>> 469
>> 470 G4double range=Pmax-Pmin; // Uzhi
>> 471
>> 472 if ( Pmin <= 0. || range <=0. )
>> 473 {
>> 474 G4cout << " Pmin, range : " << Pmin << " , " << range << G4endl;
>> 475 throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation::ChooseP : Invalid arguments ");
>> 476 }
>> 477
>> 478 G4double P;
>> 479 /* // Uzhi
>> 480 do {
>> 481 x=Xmin + G4UniformRand() * range;
>> 482 } while ( Xmin/x < G4UniformRand() );
>> 483 */ // Uzhi
>> 484
>> 485 P=Pmin * std::pow(Pmax/Pmin,G4UniformRand()); // Uzhi
>> 486
>> 487 //debug-hpw cout << "DiffractiveX "<<x<<G4endl;
>> 488 return P;
>> 489 }
>> 490
>> 491 G4ThreeVector G4DiffractiveExcitation::GaussianPt(G4double AveragePt2, G4double maxPtSquare) const // Uzhi
>> 492 { // @@ this method is used in FTFModel as well. Should go somewhere common!
>> 493
>> 494 G4double Pt2;
>> 495 /* // Uzhi
>> 496 do {
>> 497 pt2=widthSquare * std::log( G4UniformRand() );
>> 498 } while ( pt2 > maxPtSquare);
>> 499 */ // Uzhi
>> 500
>> 501 Pt2 = -AveragePt2 * std::log(1. + G4UniformRand() * (std::exp(-maxPtSquare/AveragePt2)-1.));// Uzhi
>> 502
>> 503 G4double Pt=std::sqrt(Pt2);
>> 504
>> 505 G4double phi=G4UniformRand() * twopi;
>> 506
>> 507 return G4ThreeVector (Pt*std::cos(phi), Pt*std::sin(phi), 0.);
>> 508 }
>> 509
>> 510 G4DiffractiveExcitation::G4DiffractiveExcitation(const G4DiffractiveExcitation &)
>> 511 {
>> 512 throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation copy contructor not meant to be called");
>> 513 }
>> 514
>> 515
>> 516 G4DiffractiveExcitation::~G4DiffractiveExcitation()
>> 517 {
>> 518 }
>> 519
>> 520
>> 521 const G4DiffractiveExcitation & G4DiffractiveExcitation::operator=(const G4DiffractiveExcitation &)
>> 522 {
>> 523 throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation = operator meant to be called");
>> 524 return *this;
>> 525 }
>> 526
>> 527
>> 528 int G4DiffractiveExcitation::operator==(const G4DiffractiveExcitation &) const
>> 529 {
>> 530 throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation == operator meant to be called");
>> 531 return false;
>> 532 }
>> 533
>> 534 int G4DiffractiveExcitation::operator!=(const G4DiffractiveExcitation &) const
>> 535 {
>> 536 throw G4HadronicException(__FILE__, __LINE__, "G4DiffractiveExcitation != operator meant to be called");
>> 537 return true;
1619 } 538 }
1620 <<
1621 539