1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
17 // Generator using DPMJET as an external generator
18 // The main DPMJET options are accessable for the user through this interface.
19 // Uses the TDPMjet implementation of TGenerator.
24 #include <TParticle.h>
26 #include <TDatabasePDG.h>
27 #include <TParticlePDG.h>
28 #include <TParticleClassPDG.h>
30 #include <TLorentzVector.h>
31 #include <TClonesArray.h>
32 #include "AliRunLoader.h"
33 #include "AliGenDPMjet.h"
34 #include "AliGenDPMjetEventHeader.h"
36 #include "AliDpmJetRndm.h"
37 #include "AliHeader.h"
41 ClassImp(AliGenDPMjet)
43 //______________________________________________________________________________
44 AliGenDPMjet::AliGenDPMjet()
66 AliDpmJetRndm::SetDpmJetRandom(GetRandom());
70 //______________________________________________________________________________
71 AliGenDPMjet::AliGenDPMjet(Int_t npart)
91 // Default PbPb collisions at 5. 5 TeV
95 fTitle= "Particle Generator using DPMJET";
99 AliDpmJetRndm::SetDpmJetRandom(GetRandom());
102 AliGenDPMjet::AliGenDPMjet(const AliGenDPMjet &/*Dpmjet*/)
122 // Dummy copy constructor
126 //______________________________________________________________________________
127 AliGenDPMjet::~AliGenDPMjet()
131 //______________________________________________________________________________
132 void AliGenDPMjet::Init()
136 SetMC(new TDPMjet(fProcess, fAProjectile, fZProjectile, fATarget, fZTarget,
137 fBeamEn,fEnergyCMS));
139 fDPMjet=(TDPMjet*) fMCEvGen;
141 // **** Flag to force central production
142 // fICentr=1. central production forced
143 // fICentr<0 && fICentr>-100 -> bmin = fMinImpactParam, bmax = fMaxImpactParam
144 // fICentr<-99 -> fraction of x-sec. = XSFRAC
145 // fICentr=-1. -> evaporation/fzc suppressed
146 // fICentr<-1. -> evaporation/fzc suppressed
147 if (fAProjectile == 1 && TMath::Abs(fZProjectile == 1)) fDPMjet->SetfIdp(1);
149 fDPMjet->SetfFCentr(fICentr);
150 fDPMjet->SetbRange(fMinImpactParam, fMaxImpactParam);
151 fDPMjet->SetPi0Decay(fPi0Decay);
152 fDPMjet->SetDecayAll(fDecayAll);
156 fDPMjet->Initialize();
160 //______________________________________________________________________________
161 void AliGenDPMjet::Generate()
163 // Generate one event
165 Float_t polar[3] = {0,0,0};
166 Float_t origin[3] = {0,0,0};
170 // converts from mm/c to s
171 const Float_t kconv = 0.001/2.999792458e8;
177 // Set collision vertex position
178 if (fVertexSmear == kPerEvent) Vertex();
182 // Generate one event
183 // --------------------------------------------------------------------------
186 // --------------------------------------------------------------------------
187 fDPMjet->GenerateEvent();
190 fDPMjet->ImportParticles(&fParticles,"All");
194 fGenImpPar = fDPMjet->GetBImpac();
196 Int_t np = fParticles.GetEntriesFast();
197 printf("\n **************************************************%d\n",np);
201 Int_t* newPos = new Int_t[np];
202 Int_t* pSelected = new Int_t[np];
204 for (i = 0; i<np; i++) {
209 // First select parent particles
211 for (i = 0; i<np; i++) {
212 TParticle *iparticle = (TParticle *) fParticles.At(i);
214 // Is this a parent particle ?
216 if (Stable(iparticle)) continue;
218 Bool_t selected = kTRUE;
219 Bool_t hasSelectedDaughters = kFALSE;
221 kf = iparticle->GetPdgCode();
222 if (kf == 92 || kf == 99999) continue;
223 ks = iparticle->GetStatusCode();
224 // No initial state partons
225 if (ks==21) continue;
227 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
229 hasSelectedDaughters = DaughtersSelection(iparticle);
231 // Put particle on the stack if it is either selected or
232 // it is the mother of at least one seleted particle
234 if (selected || hasSelectedDaughters) {
238 } // particle loop parents
240 // Now select the final state particles
243 for (i=0; i<np; i++) {
244 TParticle *iparticle = (TParticle *) fParticles.At(i);
246 // Is this a final state particle ?
248 if (!Stable(iparticle)) continue;
250 Bool_t selected = kTRUE;
251 kf = iparticle->GetPdgCode();
252 ks = iparticle->GetStatusCode();
254 // --------------------------------------------------------------------------
255 // Count spectator neutrons and protons (ks == 13, 14)
256 if(ks == 13 || ks == 14){
257 if(kf == kNeutron) fSpecn += 1;
258 if(kf == kProton) fSpecp += 1;
260 // --------------------------------------------------------------------------
263 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
264 if (!fSpectators && selected) selected = (ks == 13 || ks == 14);
267 // Put particle on the stack if selected
273 } // particle loop final state
275 // Write particles to stack
277 for (i = 0; i<np; i++) {
278 TParticle * iparticle = (TParticle *) fParticles.At(i);
279 Bool_t hasMother = (iparticle->GetFirstMother()>=0);
282 kf = iparticle->GetPdgCode();
283 ks = iparticle->GetStatusCode();
285 p[0] = iparticle->Px();
286 p[1] = iparticle->Py();
287 p[2] = iparticle->Pz();
288 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
289 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
290 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
292 tof = kconv*iparticle->T();
295 TParticle* mother = 0;
297 imo = iparticle->GetFirstMother();
298 mother = (TParticle *) fParticles.At(imo);
299 imo = (mother->GetPdgCode() != 92 && mother->GetPdgCode() != 99999) ? newPos[imo] : -1;
302 Bool_t tFlag = (fTrackIt && (ks == 1));
303 PushTrack(tFlag,imo,kf,p,origin,polar,tof,kPNoProcess,nt, 1., ks);
312 if (jev >= fNpart || fNpart == -1) {
318 SetHighWaterMark(nt);
321 //______________________________________________________________________________
322 Bool_t AliGenDPMjet::DaughtersSelection(TParticle* iparticle)
325 // Looks recursively if one of the daughters has been selected
327 // printf("\n Consider daughters %d:",iparticle->GetPdgCode());
331 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
332 Bool_t selected = kFALSE;
334 imin = iparticle->GetFirstDaughter();
335 imax = iparticle->GetLastDaughter();
336 for (i = imin; i <= imax; i++){
337 TParticle * jparticle = (TParticle *) fParticles.At(i);
338 Int_t ip = jparticle->GetPdgCode();
339 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
340 selected=kTRUE; break;
342 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
352 //______________________________________________________________________________
353 Bool_t AliGenDPMjet::SelectFlavor(Int_t pid)
355 // Select flavor of particle
357 // 4: charm and beauty
364 Int_t ifl = TMath::Abs(pid/100);
365 if (ifl > 10) ifl/=10;
366 res = (fFlavor == ifl);
369 // This part if gamma writing is inhibited
371 res = res && (pid != kGamma && pid != kPi0);
376 //______________________________________________________________________________
377 Bool_t AliGenDPMjet::Stable(TParticle* particle)
379 // Return true for a stable particle
382 // if (particle->GetFirstDaughter() < 0 ) return kTRUE;
383 if (particle->GetStatusCode() == 1) return kTRUE;
388 //______________________________________________________________________________
389 void AliGenDPMjet::MakeHeader()
391 // Builds the event header, to be called after each event
392 AliGenEventHeader* header = new AliGenDPMjetEventHeader("DPMJET");
393 ((AliGenDPMjetEventHeader*) header)->SetNProduced(fDPMjet->GetNumStablePc());
394 ((AliGenDPMjetEventHeader*) header)->SetImpactParameter(fDPMjet->GetBImpac());
395 ((AliGenDPMjetEventHeader*) header)->SetTotalEnergy(fDPMjet->GetTotEnergy());
396 ((AliGenDPMjetEventHeader*) header)->SetParticipants(fDPMjet->GetfIp(),
398 ((AliGenDPMjetEventHeader*) header)->SetProcessType(fDPMjet->GetProcessCode());
399 // Bookkeeping for kinematic bias
400 ((AliGenDPMjetEventHeader*) header)->SetTrials(fTrials);
402 header->SetPrimaryVertex(fVertex);
403 gAlice->SetGenEventHeader(header);
407 void AliGenDPMjet::AddHeader(AliGenEventHeader* header)
409 // Add header to container or runloader
411 fContainer->AddHeader(header);
413 AliRunLoader::Instance()->GetHeader()->SetGenEventHeader(header);
418 //______________________________________________________________________________
419 AliGenDPMjet& AliGenDPMjet::operator=(const AliGenDPMjet& /*rhs*/)
421 // Assignment operator
426 void AliGenDPMjet::FinishRun()
428 // Print run statistics
429 fDPMjet->Dt_Dtuout();
434 //______________________________________________________________________________