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 **************************************************************************/
18 Revision 1.41 2002/03/05 11:25:33 morsch
19 - New quenching options
20 - Correction in CheckTrigger()
22 Revision 1.40 2002/02/12 11:05:53 morsch
23 Get daughter indices right.
25 Revision 1.39 2002/02/12 09:16:39 morsch
26 Correction in SelectFlavor()
28 Revision 1.38 2002/02/12 08:53:21 morsch
29 SetNoGammas can be used to inhibit writing of gammas and pi0.
31 Revision 1.37 2002/02/08 16:50:50 morsch
32 Add name and title in constructor.
34 Revision 1.36 2002/01/31 20:17:55 morsch
35 Allow for triggered jets with simplified topology: Exact pT, back-to-back
37 Revision 1.35 2001/12/13 07:56:25 hristov
38 Set pointers to zero in the default constructor
40 Revision 1.34 2001/12/11 16:55:42 morsch
41 Correct initialization for jet phi-range.
43 Revision 1.33 2001/12/05 10:18:51 morsch
44 Possibility of kinematic biasing of jet phi range. (J. Klay)
46 Revision 1.32 2001/11/28 13:51:11 morsch
47 Introduce kinematic biasing (etamin, etamax) of jet trigger. Bookkeeping
48 (number of trials) done in AliGenHijingEventHeader.
50 Revision 1.31 2001/11/06 12:30:34 morsch
51 Add Boost() method to boost all particles to LHC lab frame. Needed for asymmetric collision systems.
53 Revision 1.30 2001/10/21 18:35:56 hristov
54 Several pointers were set to zero in the default constructors to avoid memory management problems
56 Revision 1.29 2001/10/15 08:12:24 morsch
57 - Vertex smearing with truncated gaussian.
58 - Store triggered jet info before and after final state radiation into mc-heade
60 Revision 1.28 2001/10/08 11:55:25 morsch
61 Store 4-momenta of trigegred jets in event header.
62 Possibility to switch of initial and final state radiation.
64 Revision 1.27 2001/10/08 07:13:14 morsch
65 Add setter for minimum transverse momentum of triggered jet.
67 Revision 1.26 2001/10/04 08:12:24 morsch
68 Redefinition of stable condition.
70 Revision 1.25 2001/07/27 17:09:36 morsch
71 Use local SetTrack, KeepTrack and SetHighWaterMark methods
72 to delegate either to local stack or to stack owned by AliRun.
73 (Piotr Skowronski, A.M.)
75 Revision 1.24 2001/07/20 09:34:56 morsch
76 Count the number of spectator neutrons and protons and add information
77 to the event header. (Chiara Oppedisano)
79 Revision 1.23 2001/07/13 17:30:22 morsch
82 Revision 1.22 2001/06/11 13:09:23 morsch
83 - Store cross-Section and number of binary collisions as a function of impact parameter
84 - Pass AliGenHijingEventHeader to gAlice.
86 Revision 1.21 2001/02/28 17:35:24 morsch
87 Consider elastic interactions (ks = 1 and ks = 11) as spectator (Chiara Oppedisano)
89 Revision 1.20 2001/02/14 15:50:40 hristov
90 The last particle in event marked using SetHighWaterMark
92 Revision 1.19 2000/12/21 16:24:06 morsch
93 Coding convention clean-up
95 Revision 1.18 2000/12/06 17:46:30 morsch
96 Avoid random numbers 1 and 0.
98 Revision 1.17 2000/12/04 11:22:03 morsch
99 Init of sRandom as in 1.15
101 Revision 1.16 2000/12/02 11:41:39 morsch
102 Use SetRandom() to initialize random number generator in constructor.
104 Revision 1.15 2000/11/30 20:29:02 morsch
105 Initialise static variable sRandom in constructor: sRandom = fRandom;
107 Revision 1.14 2000/11/30 07:12:50 alibrary
108 Introducing new Rndm and QA classes
110 Revision 1.13 2000/11/09 17:40:27 morsch
111 Possibility to select/unselect spectator protons and neutrons.
112 Method SetSpectators(Int_t spect) added. (FCA, Ch. Oppedisano)
114 Revision 1.12 2000/10/20 13:38:38 morsch
115 Debug printouts commented.
117 Revision 1.11 2000/10/20 13:22:26 morsch
118 - skip particle type 92 (string)
119 - Charmed and beauty baryions (5122, 4122) are considered as stable consistent with
122 Revision 1.10 2000/10/17 15:10:20 morsch
123 Write first all the parent particles to the stack and then the final state particles.
125 Revision 1.9 2000/10/17 13:38:59 morsch
126 Protection against division by zero in EvaluateCrossSection() and KinematicSelection(..) (FCA)
128 Revision 1.8 2000/10/17 12:46:31 morsch
129 Protect EvaluateCrossSections() against division by zero.
131 Revision 1.7 2000/10/02 21:28:06 fca
132 Removal of useless dependecies via forward declarations
134 Revision 1.6 2000/09/11 13:23:37 morsch
135 Write last seed to file (fortran lun 50) and reed back from same lun using calls to
136 luget_hijing and luset_hijing.
138 Revision 1.5 2000/09/07 16:55:40 morsch
139 fHijing->Initialize(); after change of parameters. (Dmitri Yurevitch Peressounko)
141 Revision 1.4 2000/07/11 18:24:56 fca
142 Coding convention corrections + few minor bug fixes
144 Revision 1.3 2000/06/30 12:08:36 morsch
145 In member data: char* replaced by TString, Init takes care of resizing the strings to
146 8 characters required by Hijing.
148 Revision 1.2 2000/06/15 14:15:05 morsch
149 Add possibility for heavy flavor selection: charm and beauty.
151 Revision 1.1 2000/06/09 20:47:27 morsch
152 AliGenerator interface class to HIJING using THijing (test version)
158 // Generator using HIJING as an external generator
159 // The main HIJING options are accessable for the user through this interface.
160 // Uses the THijing implementation of TGenerator.
162 // andreas.morsch@cern.ch
164 #include "AliGenHijing.h"
165 #include "AliGenHijingEventHeader.h"
170 #include <TParticle.h>
173 #include <TLorentzVector.h>
176 ClassImp(AliGenHijing)
178 AliGenHijing::AliGenHijing()
187 AliGenHijing::AliGenHijing(Int_t npart)
190 // Default PbPb collisions at 5. 5 TeV
193 fTitle= "Particle Generator using HIJING";
196 SetImpactParameterRange();
222 // Set random number generator
228 AliGenHijing::AliGenHijing(const AliGenHijing & Hijing)
234 AliGenHijing::~AliGenHijing()
237 if ( fDsigmaDb) delete fDsigmaDb;
238 if ( fDnDb) delete fDnDb;
241 void AliGenHijing::Init()
246 fProjectile.Resize(8);
248 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
249 fAProjectile, fZProjectile, fATarget, fZTarget,
250 fMinImpactParam, fMaxImpactParam));
252 fHijing=(THijing*) fgMCEvGen;
253 fHijing->SetIHPR2(2, fRadiation);
254 fHijing->SetIHPR2(3, fTrigger);
255 fHijing->SetIHPR2(6, fShadowing);
256 fHijing->SetIHPR2(12, fDecaysOff);
257 fHijing->SetIHPR2(21, fKeep);
258 fHijing->SetHIPR1(10, fPtMinJet);
259 fHijing->SetHIPR1(50, fSimpleJet);
264 // fQuench = 0: no quenching
265 // fQuench = 1: hijing default
266 // fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
267 // fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
268 // fQuench = 4: new LHC parameters with log(e) dependence
269 // fQuench = 5: new RHIC parameters with log(e) dependence
270 fHijing->SetIHPR2(50, 0);
272 fHijing->SetIHPR2(4, 1);
274 fHijing->SetIHPR2(4, 0);
275 // New LHC parameters from Xin-Nian Wang
277 fHijing->SetHIPR1(14, 1.1);
278 fHijing->SetHIPR1(11, 3.7);
279 } else if (fQuench == 3) {
280 fHijing->SetHIPR1(14, 0.20);
281 fHijing->SetHIPR1(11, 2.5);
282 } else if (fQuench == 4) {
283 fHijing->SetIHPR2(50, 1);
284 fHijing->SetHIPR1(14, 4.*0.34);
285 fHijing->SetHIPR1(11, 3.7);
286 } else if (fQuench == 5) {
287 fHijing->SetIHPR2(50, 1);
288 fHijing->SetHIPR1(14, 0.34);
289 fHijing->SetHIPR1(11, 2.5);
297 fHijing->Initialize();
299 if (fEvaluate) EvaluateCrossSections();
302 // Initialize random generator
305 void AliGenHijing::Generate()
307 // Generate one event
309 Float_t polar[3] = {0,0,0};
310 Float_t origin[3] = {0,0,0};
311 Float_t origin0[3] = {0,0,0};
312 Float_t p[3], random[6];
315 static TClonesArray *particles;
316 // converts from mm/c to s
317 const Float_t kconv = 0.001/2.999792458e8;
321 Int_t j, kf, ks, imo;
324 if(!particles) particles = new TClonesArray("TParticle",10000);
327 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
328 if(fVertexSmear == kPerEvent) {
331 while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
333 for (j=0; j < 3; j++) {
334 dv[j] = fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
335 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
338 for (j=0; j < 3; j++) origin0[j] += dv[j];
339 } else if (fVertexSmear == kPerTrack) {
340 // fHijing->SetMSTP(151,0);
341 for (j = 0; j < 3; j++) {
342 // fHijing->SetPARP(151+j, fOsigma[j]*10.);
347 // Generate one event
348 // --------------------------------------------------------------------------
351 // --------------------------------------------------------------------------
352 fHijing->GenerateEvent();
354 if (fTrigger != kNoTrigger) {
355 if (!CheckTrigger()) continue;
358 fHijing->ImportParticles(particles,"All");
359 if (fLHC) Boost(particles);
362 Int_t np = particles->GetEntriesFast();
363 printf("\n **************************************************%d\n",np);
365 if (np == 0 ) continue;
367 Int_t* newPos = new Int_t[np];
368 Int_t* pSelected = new Int_t[np];
370 for (i = 0; i < np; i++) {
377 TParticle * iparticle = (TParticle *) particles->At(0);
378 fEventVertex[0] = origin0[0];
379 fEventVertex[1] = origin0[1];
380 fEventVertex[2] = origin0[2];
383 // First select parent particles
386 for (i = 0; i < np; i++) {
387 iparticle = (TParticle *) particles->At(i);
388 // Is this a parent particle ?
389 if (Stable(iparticle)) continue;
391 Bool_t selected = kTRUE;
392 Bool_t hasSelectedDaughters = kFALSE;
395 kf = iparticle->GetPdgCode();
396 ks = iparticle->GetStatusCode();
397 if (kf == 92) continue;
399 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
401 hasSelectedDaughters = DaughtersSelection(iparticle, particles);
403 // Put particle on the stack if it is either selected or
404 // it is the mother of at least one seleted particle
406 if (selected || hasSelectedDaughters) {
410 } // particle loop parents
412 // Now select the final state particles
415 for (i = 0; i<np; i++) {
416 TParticle * iparticle = (TParticle *) particles->At(i);
417 // Is this a final state particle ?
418 if (!Stable(iparticle)) continue;
420 Bool_t selected = kTRUE;
421 kf = iparticle->GetPdgCode();
422 ks = iparticle->GetStatusCode();
423 // --------------------------------------------------------------------------
424 // Count spectator neutrons and protons
425 if(ks == 0 || ks == 1 || ks == 10 || ks == 11){
426 if(kf == kNeutron) fSpecn += 1;
427 if(kf == kProton) fSpecp += 1;
429 // --------------------------------------------------------------------------
432 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
433 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
437 // Put particle on the stack if selected
443 } // particle loop final state
445 // Write particles to stack
447 for (i = 0; i<np; i++) {
448 TParticle * iparticle = (TParticle *) particles->At(i);
449 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
450 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
453 kf = iparticle->GetPdgCode();
454 ks = iparticle->GetStatusCode();
455 p[0] = iparticle->Px();
456 p[1] = iparticle->Py();
457 p[2] = iparticle->Pz();
458 origin[0] = origin0[0]+iparticle->Vx()/10;
459 origin[1] = origin0[1]+iparticle->Vy()/10;
460 origin[2] = origin0[2]+iparticle->Vz()/10;
461 tof = kconv*iparticle->T();
463 TParticle* mother = 0;
465 imo = iparticle->GetFirstMother();
466 mother = (TParticle *) particles->At(imo);
467 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
469 Bool_t tFlag = (fTrackIt && !hasDaughter);
470 SetTrack(tFlag,imo,kf,p,origin,polar,
471 tof,kPNoProcess,nt, 1., ks);
479 printf("\n I've put %i particles on the stack \n",nc);
482 if (jev >= fNpart || fNpart == -1) {
483 fKineBias = Float_t(fNpart)/Float_t(fTrials);
484 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
490 SetHighWaterMark(nt);
493 void AliGenHijing::KeepFullEvent()
498 void AliGenHijing::EvaluateCrossSections()
500 // Glauber Calculation of geometrical x-section
502 Float_t xTot = 0.; // barn
503 Float_t xTotHard = 0.; // barn
504 Float_t xPart = 0.; // barn
505 Float_t xPartHard = 0.; // barn
506 Float_t sigmaHard = 0.1; // mbarn
508 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
509 const Float_t kdib = 0.2;
510 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
513 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
514 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
516 Float_t oldvalue= 0.;
518 Float_t* b = new Float_t[kMax];
519 Float_t* si1 = new Float_t[kMax];
520 Float_t* si2 = new Float_t[kMax];
522 for (i = 0; i < kMax; i++)
524 Float_t xb = bMin+i*kdib;
526 ov=fHijing->Profile(xb);
527 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
528 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
531 if (xb > fMinImpactParam && xb < fMaxImpactParam)
537 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
539 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
540 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
548 printf("\n Total cross section (barn): %f \n",xTot);
549 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
550 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
551 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
553 // Store result as a graph
558 fDsigmaDb = new TGraph(i, b, si1);
559 fDnDb = new TGraph(i, b, si2);
562 Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle, TClonesArray* particles)
565 // Looks recursively if one of the daughters has been selected
567 // printf("\n Consider daughters %d:",iparticle->GetPdgCode());
571 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
572 Bool_t selected = kFALSE;
574 imin = iparticle->GetFirstDaughter();
575 imax = iparticle->GetLastDaughter();
576 for (i = imin; i <= imax; i++){
577 TParticle * jparticle = (TParticle *) particles->At(i);
578 Int_t ip = jparticle->GetPdgCode();
579 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
580 selected=kTRUE; break;
582 if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; }
591 Bool_t AliGenHijing::SelectFlavor(Int_t pid)
593 // Select flavor of particle
595 // 4: charm and beauty
602 Int_t ifl = TMath::Abs(pid/100);
603 if (ifl > 10) ifl/=10;
604 res = (fFlavor == ifl);
607 // This part if gamma writing is inhibited
609 res = res && (pid != kGamma && pid != kPi0);
614 Bool_t AliGenHijing::Stable(TParticle* particle)
616 // Return true for a stable particle
619 if (particle->GetFirstDaughter() < 0 )
628 void AliGenHijing::Boost(TClonesArray* particles)
631 // Boost cms into LHC lab frame
633 Double_t dy = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
634 (Double_t(fZTarget) * Double_t(fAProjectile)));
635 Double_t beta = TMath::TanH(dy);
636 Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
637 Double_t gb = gamma * beta;
639 printf("\n Boosting particles to lab frame %f %f %f", dy, beta, gamma);
642 Int_t np = particles->GetEntriesFast();
643 for (i = 0; i < np; i++)
645 TParticle* iparticle = (TParticle*) particles->At(i);
647 Double_t e = iparticle->Energy();
648 Double_t px = iparticle->Px();
649 Double_t py = iparticle->Py();
650 Double_t pz = iparticle->Pz();
652 Double_t eb = gamma * e - gb * pz;
653 Double_t pzb = -gb * e + gamma * pz;
655 iparticle->SetMomentum(px, py, pzb, eb);
660 void AliGenHijing::MakeHeader()
662 // Builds the event header, to be called after each event
663 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
664 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
665 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
666 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
667 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
668 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
669 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
673 ((AliGenHijingEventHeader*) header)->SetSpectators(fSpecn, fSpecp);
675 // 4-momentum vectors of the triggered jets.
677 // Before final state gluon radiation.
678 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
679 fHijing->GetHINT1(22),
680 fHijing->GetHINT1(23),
681 fHijing->GetHINT1(24));
683 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
684 fHijing->GetHINT1(32),
685 fHijing->GetHINT1(33),
686 fHijing->GetHINT1(34));
687 // After final state gluon radiation.
688 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
689 fHijing->GetHINT1(27),
690 fHijing->GetHINT1(28),
691 fHijing->GetHINT1(29));
693 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
694 fHijing->GetHINT1(37),
695 fHijing->GetHINT1(38),
696 fHijing->GetHINT1(39));
697 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
698 // Bookkeeping for kinematic bias
699 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
701 header->SetPrimaryVertex(fEventVertex);
702 gAlice->SetGenEventHeader(header);
705 Bool_t AliGenHijing::CheckTrigger()
707 // Check the kinematic trigger condition
709 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
710 fHijing->GetHINT1(27),
711 fHijing->GetHINT1(28),
712 fHijing->GetHINT1(29));
714 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
715 fHijing->GetHINT1(37),
716 fHijing->GetHINT1(38),
717 fHijing->GetHINT1(39));
718 Double_t eta1 = jet1->Eta();
719 Double_t eta2 = jet2->Eta();
720 Double_t phi1 = jet1->Phi();
721 Double_t phi2 = jet2->Phi();
722 Bool_t triggered = kFALSE;
723 // printf("\n Trigger: %f %f %f %f",
724 // fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
725 // printf("\n Jet1: %f %f", phi1, eta1);
726 // printf("\n Jet2: %f %f", phi2, eta2);
730 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
731 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
733 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
734 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
744 AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
746 // Assignment operator
751 # define rluget_hijing rluget_hijing_
752 # define rluset_hijing rluset_hijing_
753 # define rlu_hijing rlu_hijing_
754 # define type_of_call
756 # define rluget_hijing RLUGET_HIJING
757 # define rluset_hijing RLUSET_HIJING
758 # define rlu_hijing RLU_HIJING
759 # define type_of_call _stdcall
764 void type_of_call rluget_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
765 {printf("Dummy version of rluget_hijing reached\n");}
767 void type_of_call rluset_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
768 {printf("Dummy version of rluset_hijing reached\n");}
770 Double_t type_of_call rlu_hijing(Int_t & /*idum*/)
773 do r=sRandom->Rndm(); while(0 >= r || r >= 1);