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25 //
26 // Historic fragment from M.Komogorov; clean-up still necessary @@@
27
28 #include "G4ExcitedStringDecay.hh"
29 #include "G4SystemOfUnits.hh"
30 #include "G4KineticTrack.hh"
31 #include "G4LundStringFragmentation.hh"
32 #include "G4HadronicInteractionRegistry.hh"
33
34 #include "G4SampleResonance.hh"
35
36 //#define debug_G4ExcitedStringDecay
37 //#define debug_G4ExcitedStringCorr
38
39 G4ExcitedStringDecay::G4ExcitedStringDecay(G4VLongitudinalStringDecay* ptr)
40 : G4VStringFragmentation(), theStringDecay(ptr)
41 {
42 if(!ptr) {
43 G4HadronicInteraction* p =
44 G4HadronicInteractionRegistry::Instance()->FindModel("LundStringFragmentation");
45 theStringDecay = static_cast<G4VLongitudinalStringDecay*>(p);
46 if(!theStringDecay) { theStringDecay = new G4LundStringFragmentation(); }
47 }
48 SetModelName(theStringDecay->GetModelName());
49 }
50
51 G4ExcitedStringDecay::~G4ExcitedStringDecay()
52 {}
53
54 G4KineticTrackVector *G4ExcitedStringDecay::FragmentString(const G4ExcitedString &theString)
55 {
56 return theStringDecay->FragmentString(theString);
57 }
58
59 G4KineticTrackVector *G4ExcitedStringDecay::FragmentStrings(const G4ExcitedStringVector * theStrings)
60 {
61 G4LorentzVector KTsum(0.,0.,0.,0.);
62
63 #ifdef debug_G4ExcitedStringDecay
64 G4cout<<G4endl;
65 G4cout<<"--------------------------- G4ExcitedStringDecay ----------------------"<<G4endl;
66 G4cout<<"Hadronization of Excited Strings: theStrings->size() "<<theStrings->size()<<G4endl;
67 #endif
68
69 for ( unsigned int astring=0; astring < theStrings->size(); astring++)
70 // for ( unsigned int astring=0; astring < 1; astring++)
71 {
72 // G4cout<<"theStrings->operator[](astring)->IsExcited() "<<" "<<astring<<" "<<theStrings->operator[](astring)->IsExcited()<<G4endl;
73 if ( theStrings->operator[](astring)->IsExcited() )
74 {KTsum+= theStrings->operator[](astring)->Get4Momentum();}
75 else {KTsum+=theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();}
76 }
77
78 G4LorentzRotation toCms( -1 * KTsum.boostVector() );
79 G4LorentzRotation toLab(toCms.inverse());
80 G4LorentzVector Ptmp;
81 KTsum=G4LorentzVector(0.,0.,0.,0.);
82
83 for ( unsigned int astring=0; astring < theStrings->size(); astring++)
84 // for ( unsigned int astring=0; astring < 1; astring++)
85 {
86 if ( theStrings->operator[](astring)->IsExcited() )
87 {
88 Ptmp=toCms * theStrings->operator[](astring)->GetLeftParton()->Get4Momentum();
89 theStrings->operator[](astring)->GetLeftParton()->Set4Momentum(Ptmp);
90
91 Ptmp=toCms * theStrings->operator[](astring)->GetRightParton()->Get4Momentum();
92 theStrings->operator[](astring)->GetRightParton()->Set4Momentum(Ptmp);
93
94 KTsum+= theStrings->operator[](astring)->Get4Momentum();
95 }
96 else
97 {
98 Ptmp=toCms * theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
99 theStrings->operator[](astring)->GetKineticTrack()->Set4Momentum(Ptmp);
100 KTsum+= theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
101 }
102 }
103
104 G4SampleResonance BrW;
105 const G4ParticleDefinition* TrackDefinition=0;
106
107 G4KineticTrackVector * theResult = new G4KineticTrackVector;
108 G4int attempts(0);
109 G4bool success=false;
110 G4bool NeedEnergyCorrector=false;
111 do {
112 #ifdef debug_G4ExcitedStringDecay
113 G4cout<<"New try No "<<attempts<<" to hadronize strings"<<G4endl;
114 #endif
115
116 std::for_each(theResult->begin() , theResult->end() , DeleteKineticTrack());
117 theResult->clear();
118
119 attempts++;
120
121 G4LorentzVector KTsecondaries(0.,0.,0.,0.);
122 NeedEnergyCorrector=false;
123
124 for ( unsigned int astring=0; astring < theStrings->size(); astring++)
125 // for ( unsigned int astring=0; astring < 1; astring++) // Proj. Last Str. Decay for FTF
126 // for ( unsigned int astring=1; astring < 2; astring++) // Proj. Last Str. Decay for QGS
127 // for ( unsigned int astring=0; astring < 1; astring++) // For testing purposes
128 {
129 #ifdef debug_G4ExcitedStringDecay
130 G4cout<<"String No "<<astring+1<<" Excited? "<<theStrings->operator[](astring)->IsExcited()<<G4endl;
131
132 G4cout<<"String No "<<astring+1<<" 4Momentum "<<theStrings->operator[](astring)->Get4Momentum()
133 <<" "<<theStrings->operator[](astring)->Get4Momentum().mag()<<G4endl;
134 #endif
135
136 G4KineticTrackVector * generatedKineticTracks = NULL;
137 if ( theStrings->operator[](astring)->IsExcited() )
138 {
139 #ifdef debug_G4ExcitedStringDecay
140 G4cout<<"Fragment String with partons: "
141 <<theStrings->operator[](astring)->GetLeftParton()->GetPDGcode() <<" "
142 <<theStrings->operator[](astring)->GetRightParton()->GetPDGcode()<<" "
143 <<"Direction "<<theStrings->operator[](astring)->GetDirection()<<G4endl;
144 #endif
145 generatedKineticTracks=FragmentString(*theStrings->operator[](astring));
146 #ifdef debug_G4ExcitedStringDecay
147 G4cout<<"(G4ExcitedStringDecay) Number of produced hadrons = "
148 <<generatedKineticTracks->size()<<G4endl;
149 #endif
150 } else {
151 #ifdef debug_G4ExcitedStringDecay
152 G4cout<<" GetTrack from the String"<<G4endl;
153 #endif
154 G4LorentzVector Mom=theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
155 G4KineticTrack * aTrack= new G4KineticTrack(
156 theStrings->operator[](astring)->GetKineticTrack()->GetDefinition(),
157 theStrings->operator[](astring)->GetKineticTrack()->GetFormationTime(),
158 G4ThreeVector(0), Mom);
159
160 aTrack->SetPosition(theStrings->operator[](astring)->GetKineticTrack()->GetPosition());
161
162 #ifdef debug_G4ExcitedStringDecay
163 G4cout<<" A particle stored in the track is "<<aTrack->GetDefinition()->GetParticleName()<<G4endl;
164 #endif
165
166 generatedKineticTracks = new G4KineticTrackVector;
167 generatedKineticTracks->push_back(aTrack);
168 }
169
170 if (generatedKineticTracks == nullptr || generatedKineticTracks->size() == 0)
171 {
172 // G4cerr << "G4VPartonStringModel:No KineticTracks produced" << G4endl;
173 delete generatedKineticTracks;
174 generatedKineticTracks = nullptr;
175 continue;
176 }
177
178 G4LorentzVector KTsum1(0.,0.,0.,0.);
179 for ( unsigned int aTrack=0; aTrack<generatedKineticTracks->size();aTrack++)
180 {
181 #ifdef debug_G4ExcitedStringDecay
182 G4cout<<"Prod part No. "<<aTrack+1<<" "
183 <<(*generatedKineticTracks)[aTrack]->GetDefinition()->GetParticleName()<<" "
184 <<(*generatedKineticTracks)[aTrack]->Get4Momentum()
185 <<(*generatedKineticTracks)[aTrack]->Get4Momentum().mag()<<G4endl;
186 #endif
187 // --------------- Sampling mass of unstable hadronic resonances ----------------
188 TrackDefinition = (*generatedKineticTracks)[aTrack]->GetDefinition();
189
190 if (TrackDefinition->IsShortLived())
191 {
192 G4double NewTrackMass =
193 BrW.SampleMass( TrackDefinition->GetPDGMass(), TrackDefinition->GetPDGWidth(),
194 BrW.GetMinimumMass( TrackDefinition ) + 10.0*MeV,
195 TrackDefinition->GetPDGMass() + 5.0*TrackDefinition->GetPDGWidth() );
196 G4LorentzVector Tmp=G4LorentzVector((*generatedKineticTracks)[aTrack]->Get4Momentum());
197 Tmp.setE(std::sqrt(sqr(NewTrackMass) + Tmp.vect().mag2()));
198
199 (*generatedKineticTracks)[aTrack]->Set4Momentum(Tmp);
200
201 #ifdef debug_G4ExcitedStringDecay
202 G4cout<<"Resonance *** "<<aTrack+1<<" "
203 <<(*generatedKineticTracks)[aTrack]->GetDefinition()->GetParticleName()<<" "
204 <<(*generatedKineticTracks)[aTrack]->Get4Momentum()
205 <<(*generatedKineticTracks)[aTrack]->Get4Momentum().mag()<<G4endl;
206 #endif
207 }
208 //-------------------------------------------------------------------------------
209
210 theResult->push_back(generatedKineticTracks->operator[](aTrack));
211 KTsum1+= (*generatedKineticTracks)[aTrack]->Get4Momentum();
212 }
213 KTsecondaries+=KTsum1;
214
215 #ifdef debug_G4ExcitedStringDecay
216 G4cout << "String secondaries(" <<generatedKineticTracks->size()<< ")"<<G4endl
217 <<"Init string momentum: "<< theStrings->operator[](astring)->Get4Momentum()<<G4endl
218 <<"Final hadrons momentum: "<< KTsum1 << G4endl;
219 #endif
220
221 if ( KTsum1.e() > 0 &&
222 std::abs((KTsum1.e()-theStrings->operator[](astring)->Get4Momentum().e()) / KTsum1.e()) > perMillion )
223 {
224 NeedEnergyCorrector=true;
225 }
226
227 #ifdef debug_G4ExcitedStringDecay
228 G4cout<<"NeedEnergyCorrection yes/no "<<NeedEnergyCorrector<<G4endl;
229 #endif
230
231 // clean up
232 delete generatedKineticTracks;
233 success=true;
234 }
235
236 if ( NeedEnergyCorrector ) success=EnergyAndMomentumCorrector(theResult, KTsum);
237 } while (!success && (attempts < 100)); /* Loop checking, 07.08.2015, A.Ribon */
238
239 for ( unsigned int aTrack=0; aTrack<theResult->size();aTrack++)
240 {
241 Ptmp=(*theResult)[aTrack]->Get4Momentum();
242 Ptmp.transform( toLab);
243 (*theResult)[aTrack]->Set4Momentum(Ptmp);
244 }
245
246 #ifdef debug_G4ExcitedStringDecay
247 G4cout<<"End of the strings fragmentation (G4ExcitedStringDecay)"<<G4endl;
248
249 G4LorentzVector KTsum1(0.,0.,0.,0.);
250
251 for ( unsigned int aTrack=0; aTrack<theResult->size();aTrack++)
252 {
253 G4cout << " corrected tracks .. " << (*theResult)[aTrack]->GetDefinition()->GetParticleName()
254 <<" " << (*theResult)[aTrack]->Get4Momentum()
255 <<" " << (*theResult)[aTrack]->Get4Momentum().mag()<< G4endl;
256 KTsum1+= (*theResult)[aTrack]->Get4Momentum();
257 }
258
259 G4cout << "Needcorrector/success " << NeedEnergyCorrector << "/" << success
260 << ", Corrected total 4 momentum " << KTsum1 << G4endl;
261 if ( ! success ) G4cout << "failed to correct E/p" << G4endl;
262
263 G4cout<<"End of the Hadronization (G4ExcitedStringDecay)"<<G4endl;
264 #endif
265
266 if (!success)
267 {
268 if (theResult->size() != 0)
269 {
270 std::for_each(theResult->begin() , theResult->end() , DeleteKineticTrack());
271 theResult->clear();
272 delete theResult; theResult=0;
273 }
274 for ( unsigned int astring=0; astring < theStrings->size(); astring++)
275 // for ( unsigned int astring=0; astring < 1; astring++) // Need more correct. For testing purposes.
276 {
277 if ( theStrings->operator[](astring)->IsExcited() )
278 {
279 Ptmp=theStrings->operator[](astring)->GetLeftParton()->Get4Momentum();
280 Ptmp.transform( toLab);
281 theStrings->operator[](astring)->GetLeftParton()->Set4Momentum(Ptmp);
282
283 Ptmp=theStrings->operator[](astring)->GetRightParton()->Get4Momentum();
284 Ptmp.transform( toLab);
285 theStrings->operator[](astring)->GetRightParton()->Set4Momentum(Ptmp);
286 }
287 else
288 {
289 Ptmp=theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
290 Ptmp.transform( toLab);
291 theStrings->operator[](astring)->GetKineticTrack()->Set4Momentum(Ptmp);
292 }
293 }
294 }
295 return theResult;
296 }
297
298
299 G4bool G4ExcitedStringDecay::
300 EnergyAndMomentumCorrector(G4KineticTrackVector* Output, G4LorentzVector& TotalCollisionMom)
301 {
302 const int nAttemptScale = 500;
303 const double ErrLimit = 1.E-5;
304 if (Output->empty()) return TRUE;
305 G4LorentzVector SumMom;
306 G4double SumMass = 0;
307 G4double TotalCollisionMass = TotalCollisionMom.m();
308
309 std::vector<G4double> HadronMass; G4double HadronM(0.);
310
311 #ifdef debug_G4ExcitedStringCorr
312 G4cout<<G4endl<<"EnergyAndMomentumCorrector. Number of particles: "<<Output->size()<<G4endl;
313 #endif
314 // Calculate sum hadron 4-momenta and summing hadron mass
315 unsigned int cHadron;
316 for (cHadron = 0; cHadron < Output->size(); cHadron++)
317 {
318 SumMom += Output->operator[](cHadron)->Get4Momentum();
319 HadronM=Output->operator[](cHadron)->Get4Momentum().mag(); HadronMass.push_back(HadronM);
320 SumMass += Output->operator[](cHadron)->Get4Momentum().mag(); //GetDefinition()->GetPDGMass();
321 }
322
323 #ifdef debug_G4ExcitedStringCorr
324 G4cout<<"Sum part mom "<<SumMom<<" "<<SumMom.mag()<<G4endl
325 <<"Sum str mom "<<TotalCollisionMom<<" "<<TotalCollisionMom.mag()<<G4endl;
326 G4cout<<"SumMass TotalCollisionMass "<<SumMass<<" "<<TotalCollisionMass<<G4endl;
327 #endif
328
329 // Cannot correct a single particle
330 if (Output->size() < 2) return FALSE;
331
332 if (SumMass > TotalCollisionMass) return FALSE;
333 SumMass = SumMom.m2();
334 if (SumMass < 0) return FALSE;
335 SumMass = std::sqrt(SumMass);
336
337 // Compute c.m.s. hadron velocity and boost KTV to hadron c.m.s.
338 // G4ThreeVector Beta = -SumMom.boostVector();
339 G4ThreeVector Beta = -TotalCollisionMom.boostVector();
340 Output->Boost(Beta);
341
342 // Scale total c.m.s. hadron energy (hadron system mass).
343 // It should be equal interaction mass
344 G4double Scale = 1;
345 G4int cAttempt = 0;
346 G4double Sum = 0;
347 G4bool success = false;
348 for (cAttempt = 0; cAttempt < nAttemptScale; cAttempt++)
349 {
350 Sum = 0;
351 for (cHadron = 0; cHadron < Output->size(); cHadron++)
352 {
353 HadronM = HadronMass.at(cHadron);
354 G4LorentzVector HadronMom = Output->operator[](cHadron)->Get4Momentum();
355 HadronMom.setVect(Scale*HadronMom.vect());
356 G4double E = std::sqrt(HadronMom.vect().mag2() + sqr(HadronM));
357 //sqr(Output->operator[](cHadron)->GetDefinition()->GetPDGMass()));
358 HadronMom.setE(E);
359 Output->operator[](cHadron)->Set4Momentum(HadronMom);
360 Sum += E;
361 }
362 Scale = TotalCollisionMass/Sum;
363 #ifdef debug_G4ExcitedStringCorr
364 G4cout << "Scale-1=" << Scale -1
365 << ", TotalCollisionMass=" << TotalCollisionMass
366 << ", Sum=" << Sum
367 << G4endl;
368 #endif
369 if (std::fabs(Scale - 1) <= ErrLimit)
370 {
371 success = true;
372 break;
373 }
374 }
375
376 #ifdef debug_G4ExcitedStringCorr
377 if (!success)
378 {
379 G4cout << "G4ExcitedStringDecay::EnergyAndMomentumCorrector - Warning"<<G4endl;
380 G4cout << " Scale not unity at end of iteration loop: "<<TotalCollisionMass<<" "<<Sum<<" "<<Scale<<G4endl;
381 G4cout << " Number of secondaries: " << Output->size() << G4endl;
382 G4cout << " Wanted total energy: " << TotalCollisionMom.e() << G4endl;
383 G4cout << " Increase number of attempts or increase ERRLIMIT"<<G4endl;
384 // throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay failed to correct...");
385 }
386 #endif
387
388 // Compute c.m.s. interaction velocity and KTV back boost
389 Beta = TotalCollisionMom.boostVector();
390 Output->Boost(Beta);
391
392 return success;
393 }
394
395