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[u/mrichter/AliRoot.git] / TDPMjet / AliGenDPMjet.cxx
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1a52e0ed 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16
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.
20
21#include <TDPMjet.h>
22#include <TRandom.h>
23#include <TArrayI.h>
24#include <TParticle.h>
25#include <TGraph.h>
26#include <TDatabasePDG.h>
27#include <TParticlePDG.h>
28#include <TParticleClassPDG.h>
29#include <TPDGCode.h>
30#include <TLorentzVector.h>
31
32#include "AliGenDPMjet.h"
33#include "AliGenDPMjetEventHeader.h"
34#include "AliPythia.h"
35#include "AliRun.h"
f2ba02a4 36#include "AliDpmJetRndm.h"
1a52e0ed 37
38 ClassImp(AliGenDPMjet)
39
40
41//______________________________________________________________________________
42AliGenDPMjet::AliGenDPMjet()
43 :AliGenMC()
44{
45// Constructor
46 fParticles = 0;
47 fDPMjet = 0;
f2ba02a4 48 AliDpmJetRndm::SetDpmJetRandom(GetRandom());
1a52e0ed 49}
50
51
52//______________________________________________________________________________
53AliGenDPMjet::AliGenDPMjet(Int_t npart)
54 :AliGenMC(npart)
55{
56// Default PbPb collisions at 5. 5 TeV
57//
58 fName = "DPMJET";
59 fTitle= "Particle Generator using DPMJET";
60
61 SetBeamEnergy();
62 SetEnergyCMS();
63 SetTarget();
64 SetProjectile();
65 SetCentral();
66 SetImpactParameterRange();
67 SetBoostLHC();
68
69 fKeep = 0;
70 fDecaysOff = 1;
71 fEvaluate = 0;
72 fSelectAll = 0;
73 fFlavor = 0;
74 fSpectators = 1;
f2ba02a4 75 fVertex.Set(3);
1a52e0ed 76
77 fParticles = new TClonesArray("TParticle",10000);
78
79 // Set random number generator
1a52e0ed 80 fDPMjet = 0;
81 // Instance AliPythia
82 AliPythia::Instance();
f2ba02a4 83 AliDpmJetRndm::SetDpmJetRandom(GetRandom());
1a52e0ed 84}
85
86
87//______________________________________________________________________________
88AliGenDPMjet::~AliGenDPMjet()
89{
90// Destructor
91 delete fParticles;
92}
93
94
95//______________________________________________________________________________
96void AliGenDPMjet::Init()
97{
98// Initialization
99
100 SetMC(new TDPMjet(fAProjectile, fZProjectile, fATarget, fZTarget,
101 fBeamEn,fEnergyCMS));
102
35c87559 103 fDPMjet=(TDPMjet*) fMCEvGen;
1a52e0ed 104 //
105 // **** Flag to force central production
106 // fICentr=1. central production forced
107 // fICentr<0 && fICentr>-100 -> bmin = fMinImpactParam, bmax = fMaxImpactParam
108 // fICentr<-99 -> fraction of x-sec. = XSFRAC
109 // fICentr=-1. -> evaporation/fzc suppressed
110 // fICentr<-1. -> evaporation/fzc suppressed
111 fDPMjet->SetfFCentr(fICentr);
112 fDPMjet->SetbRange(fMinImpactParam,fMaxImpactParam);
113
114//
115// Initialize DPMjet
116//
117 fDPMjet->Initialize();
118 //if (fEvaluate) EvaluateCrossSections();
119
120 // Initialize AliIonPDGCodes to define ion PDG codes
121 /*AliIonPDGCodes *PDGcodes = new AliIonPDGCodes();
122 PDGcodes->AddParticlesToPdgDataBase();
123 PDGcodes->MapPDGGEant3Codes();*/
124}
125
126
127//______________________________________________________________________________
128void AliGenDPMjet::Generate()
129{
130// Generate one event
131
132 Float_t polar[3] = {0,0,0};
133 Float_t origin[3] = {0,0,0};
134 Float_t origin0[3] = {0,0,0};
135 Float_t p[3], random[6];
136 Float_t tof;
137
138// converts from mm/c to s
139 const Float_t kconv = 0.001/2.999792458e8;
140 Int_t nt = 0;
141 Int_t jev = 0;
142 Int_t j, kf, ks, imo;
143 kf = 0;
144
145 fTrials = 0;
146 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
147 if(fVertexSmear == kPerEvent) {
148 Float_t dv[3];
149 dv[2] = 1.e10;
150 while(TMath::Abs(dv[2])>fCutVertexZ*fOsigma[2]) {
151 Rndm(random,6);
152 for (j=0; j < 3; j++) {
153 dv[j] = fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
154 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
155 }
156 }
157 for (j=0; j < 3; j++) origin0[j] += dv[j];
158 }
159
160 while(1)
161 {
162// Generate one event
163// --------------------------------------------------------------------------
164 fSpecn = 0;
165 fSpecp = 0;
166// --------------------------------------------------------------------------
167 fDPMjet->GenerateEvent();
168 fTrials++;
169
170 fDPMjet->ImportParticles(fParticles,"All");
171 if (fLHC) Boost();
172
173 // Temporaneo
174 fGenImpPar = fDPMjet->GetBImpac();
175
176 Int_t np = fParticles->GetEntriesFast();
177 printf("\n **************************************************%d\n",np);
178 Int_t nc=0;
179 if (np==0) continue;
180 Int_t i;
181 Int_t* newPos = new Int_t[np];
182 Int_t* pSelected = new Int_t[np];
183
184 for (i = 0; i<np; i++) {
185 newPos[i] = i;
186 pSelected[i] = 0;
187 }
188
189// Get event vertex
190
191 //TParticle *iparticle = (TParticle*) fParticles->At(0);
f2ba02a4 192 fVertex[0] = origin0[0];
193 fVertex[1] = origin0[1];
194 fVertex[2] = origin0[2];
1a52e0ed 195 //for(int jj=0; jj<3; jj++) printf(" fEventVertex[%d] = %f\n",jj,fEventVertex[jj]);
196
197// First select parent particles
198
199 for (i = 0; i<np; i++) {
200 TParticle *iparticle = (TParticle *) fParticles->At(i);
201 //if(!iparticle) iparticle->Print("");
202
203// Is this a parent particle ?
204
205 if (Stable(iparticle)) continue;
206
207 Bool_t selected = kTRUE;
208 Bool_t hasSelectedDaughters = kFALSE;
209
210 kf = iparticle->GetPdgCode();
211 if (kf == 92) continue;
212 ks = iparticle->GetStatusCode();
213// No initial state partons
214 if (ks==21) continue;
215
216 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
217 SelectFlavor(kf);
218 hasSelectedDaughters = DaughtersSelection(iparticle);
219
220// Put particle on the stack if it is either selected or
221// it is the mother of at least one seleted particle
222
223 if (selected || hasSelectedDaughters) {
224 nc++;
225 pSelected[i] = 1;
226 } // selected
227 } // particle loop parents
228
229// Now select the final state particles
230
231
232 for (i=0; i<np; i++) {
233 TParticle *iparticle = (TParticle *) fParticles->At(i);
234 //if(!iparticle) printf(" i = %d -> iparticle==0\n",i);
235
236// Is this a final state particle ?
237
238 if (!Stable(iparticle)) continue;
239
240 Bool_t selected = kTRUE;
241 kf = iparticle->GetPdgCode();
242 ks = iparticle->GetStatusCode();
243
244// --------------------------------------------------------------------------
245// Count spectator neutrons and protons (ks == 13, 14)
246 if(ks == 13 || ks == 14){
247 if(kf == kNeutron) fSpecn += 1;
248 if(kf == kProton) fSpecp += 1;
249 }
250// --------------------------------------------------------------------------
251
252 if (!fSelectAll) {
253 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
254 if (!fSpectators && selected) selected = (ks == 13 || ks == 14);
255 }
256
257// Put particle on the stack if selected
258
259 if (selected) {
260 nc++;
261 pSelected[i] = 1;
262 } // selected
263 } // particle loop final state
264
265// Write particles to stack
266
267 for (i = 0; i<np; i++) {
268 TParticle * iparticle = (TParticle *) fParticles->At(i);
269 Bool_t hasMother = (iparticle->GetFirstMother()>=0);
270 Bool_t hasDaughter = (iparticle->GetFirstDaughter()>=0);
271
272 if (pSelected[i]) {
273
274 kf = iparticle->GetPdgCode();
275 if(kf==99999) continue;
276 ks = iparticle->GetStatusCode();
277
278 p[0] = iparticle->Px();
279 p[1] = iparticle->Py();
280 p[2] = iparticle->Pz();
281 origin[0] = origin0[0]+iparticle->Vx()/10;
282 origin[1] = origin0[1]+iparticle->Vy()/10;
283 origin[2] = origin0[2]+iparticle->Vz()/10;
284 tof = kconv*iparticle->T();
285
286 imo = -1;
287 TParticle* mother = 0;
288 if (hasMother) {
289 imo = iparticle->GetFirstMother();
290 mother = (TParticle *) fParticles->At(imo);
291 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
292 } // if has mother
293
294 // --- Nucleons and photons from nucleus evaporation
295 //if(ks==-1 && (kf==2212 || kf==2112 || kf==22)) imo=-1;
296
297 // --- Offset added to nuclei, alpha particles, deuteron
298 // --- and triton PDG codes (according to TGeant3 PDG codes)
299 //if(ks==1000 || ks==1001) kf += 10000000;
300 if(kf>10000) kf += 10000000;
301
302 if(kf>10000 || ks==1000 || ks==1001) printf(" kf = %d, ks = %d imo = %d \n", kf,ks,imo);
303
304
305 Bool_t tFlag = (fTrackIt && (ks == 1));
306
307/* // --- Particle NOT to be tracked:
308 // --- (1) chains from valence quark system (idhkk=99999)
309 // --- (2) quark, diquarks and gluons (idhkk=1->8,...,idhkk=21)
310 if(kf==99999 || kf==1 || kf==2 || kf==3 || kf==4 || kf==5 ||
311 kf==6 || kf==7 || kf==8 || kf==21 ||
312 kf==1103 || kf==2101 || kf==2103 || kf==2203 || kf==3101 ||
313 kf==3103 || kf==3201 || kf==3203 || kf==3303 || kf==4101 ||
314 kf==4103 || kf==4201 || kf==4203 || kf==4301 || kf==4303 ||
315 kf==4403 || kf==5101 || kf==5103 || kf==5201 || kf==5203 ||
316 kf==5301 || kf==5303 || kf==5401 || kf==5403 || kf==5503)
317 tFlag=kFALSE;
318*/
642f15cf 319 PushTrack(tFlag,imo,kf,p,origin,polar,tof,kPNoProcess,nt, 1., ks);
1a52e0ed 320 KeepTrack(nt);
321 newPos[i] = nt;
322 } // if selected
323 } // particle loop
324 delete[] newPos;
325 delete[] pSelected;
326
327 printf("\n I've put %i particles on the stack \n",nc);
328 if (nc>0) {
329 jev += nc;
330 if (jev >= fNpart || fNpart == -1) {
331 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
332 break;
333 }
334 printf("\n Not breaking ### Trials: %i %i %i\n",fTrials, fNpart, jev);
335 }
336 } // event loop
337 MakeHeader();
338 SetHighWaterMark(nt);
339}
340
341
342//______________________________________________________________________________
343void AliGenDPMjet::KeepFullEvent()
344{
345 fKeep=1;
346}
347
348
349//______________________________________________________________________________
350/*void AliGenDPMjet::EvaluateCrossSections()
351{
352// Glauber Calculation of geometrical x-section
353//
354 Float_t xTot = 0.; // barn
355 Float_t xTotHard = 0.; // barn
356 Float_t xPart = 0.; // barn
357 Float_t xPartHard = 0.; // barn
358 Float_t sigmaHard = 0.1; // mbarn
359 Float_t bMin = 0.;
360 Float_t bMax = fDPMjet->GetProjRadius()+fDPMjet->GetTargRadius();
361 const Float_t kdib = 0.2;
362 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
363
364
365 printf("\n Projectile Radius (fm): %f \n",fDPMjet->GetProjRadius());
366 printf("\n Target Radius (fm): %f \n",fDPMjet->GetTargRadius());
367 Int_t i;
368 Float_t oldvalue= 0.;
369
370 Float_t* b = new Float_t[kMax];
371 Float_t* si1 = new Float_t[kMax];
372 Float_t* si2 = new Float_t[kMax];
373
374 for (i = 0; i < kMax; i++)
375 {
376 Float_t xb = bMin+i*kdib;
377 Float_t ov;
378 ov=fDPMjet->Profile(xb);
379 // ATT!->Manca la x-sec anel. nucleone-nucleone
380 Float_t gb = 2.*0.01*fDPMjet->TMath::Pi()*kdib*xb*(1.-TMath::Exp(-fDPMjet->GetXSFrac()*ov));
381 Float_t gbh = 2.*0.01*fDPMjet->TMath::Pi()*kdib*xb*sigmaHard*ov;
382 xTot+=gb;
383 xTotHard += gbh;
384 if (xb > fMinImpactParam && xb < fMaxImpactParam)
385 {
386 xPart += gb;
387 xPartHard += gbh;
388 }
389
390 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
391 oldvalue = xTot;
392 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
393 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
394 if (i>0) {
395 si1[i] = gb/kdib;
396 si2[i] = gbh/gb;
397 b[i] = xb;
398 }
399 }
400
401 printf("\n Total cross section (barn): %f \n",xTot);
402 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
403 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
404 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
405
406// Store result as a graph
407 b[0] = 0;
408 si1[0] = 0;
409 si2[0]=si2[1];
410
411 fDsigmaDb = new TGraph(i, b, si1);
412 fDnDb = new TGraph(i, b, si2);
413}*/
414
415
416//______________________________________________________________________________
417Bool_t AliGenDPMjet::DaughtersSelection(TParticle* iparticle)
418{
419//
420// Looks recursively if one of the daughters has been selected
421//
422// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
423 Int_t imin = -1;
424 Int_t imax = -1;
425 Int_t i;
426 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
427 Bool_t selected = kFALSE;
428 if (hasDaughters) {
429 imin = iparticle->GetFirstDaughter();
430 imax = iparticle->GetLastDaughter();
431 for (i = imin; i <= imax; i++){
432 TParticle * jparticle = (TParticle *) fParticles->At(i);
433 Int_t ip = jparticle->GetPdgCode();
434 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
435 selected=kTRUE; break;
436 }
437 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
438 }
439 } else {
440 return kFALSE;
441 }
442 return selected;
443}
444
445
446
447//______________________________________________________________________________
448Bool_t AliGenDPMjet::SelectFlavor(Int_t pid)
449{
450// Select flavor of particle
451// 0: all
452// 4: charm and beauty
453// 5: beauty
454 Bool_t res = 0;
455
456 if (fFlavor == 0) {
457 res = kTRUE;
458 } else {
459 Int_t ifl = TMath::Abs(pid/100);
460 if (ifl > 10) ifl/=10;
461 res = (fFlavor == ifl);
462 }
463//
464// This part if gamma writing is inhibited
465 if (fNoGammas)
466 res = res && (pid != kGamma && pid != kPi0);
467//
468 return res;
469}
470
471//______________________________________________________________________________
472Bool_t AliGenDPMjet::Stable(TParticle* particle)
473{
474// Return true for a stable particle
475//
476
477// if (particle->GetFirstDaughter() < 0 ) return kTRUE;
478 if (particle->GetStatusCode() == 1) return kTRUE;
479 else return kFALSE;
480
481}
482
483
484
485//______________________________________________________________________________
486/*void AliGenDPMjet::Boost(TClonesArray* particles)
487{
488//
489// Boost cms into LHC lab frame
490//
491 Double_t dy = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
492 (Double_t(fZTarget) * Double_t(fAProjectile)));
493 Double_t beta = TMath::TanH(dy);
494 Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
495 Double_t gb = gamma * beta;
496
497 printf("\n Boosting particles to lab frame %f %f %f", dy, beta, gamma);
498
499 Int_t i;
500 Int_t np = particles->GetEntriesFast();
501 for (i = 0; i < np; i++)
502 {
503 TParticle* iparticle = (TParticle*) fParticles->At(i);
504
505 Double_t e = iparticle->Energy();
506 Double_t px = iparticle->Px();
507 Double_t py = iparticle->Py();
508 Double_t pz = iparticle->Pz();
509
510 Double_t eb = gamma * e - gb * pz;
511 Double_t pzb = -gb * e + gamma * pz;
512
513 iparticle->SetMomentum(px, py, pzb, eb);
514 }
515}*/
516
517
518
519//______________________________________________________________________________
520void AliGenDPMjet::MakeHeader()
521{
522// Builds the event header, to be called after each event
523 AliGenEventHeader* header = new AliGenDPMjetEventHeader("DPMJET");
524 ((AliGenDPMjetEventHeader*) header)->SetNProduced(fDPMjet->GetNumStablePc());
525 ((AliGenDPMjetEventHeader*) header)->SetImpactParameter(fDPMjet->GetBImpac());
526 ((AliGenDPMjetEventHeader*) header)->SetTotalEnergy(fDPMjet->GetTotEnergy());
527// ((AliGenDPMjetEventHeader*) header)->SetWounded(fDPMjet->GetProjWounded(),
528// fDPMjet->GetTargWounded());
529 ((AliGenDPMjetEventHeader*) header)->SetParticipants(fDPMjet->GetfIp(),
530 fDPMjet->GetfIt());
531 /*((AliGenDPMjetEventHeader*) header)->SetCollisions(fDPMjet->GetN0(),
532 fDPMjet->GetN01(),
533 fDPMjet->GetN10(),
534 fDPMjet->GetN11());*/
535 ((AliGenDPMjetEventHeader*) header)->SetSpectators(fSpecn, fSpecp);
536
537// Bookkeeping for kinematic bias
538 ((AliGenDPMjetEventHeader*) header)->SetTrials(fTrials);
539// Event Vertex
f2ba02a4 540 header->SetPrimaryVertex(fVertex);
1a52e0ed 541 gAlice->SetGenEventHeader(header);
542}
543
544
545
546//______________________________________________________________________________
547AliGenDPMjet& AliGenDPMjet::operator=(const AliGenDPMjet& rhs)
548{
549// Assignment operator
550 return *this;
551}
552
553
554
555//______________________________________________________________________________