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 1.42.4.1 2002/08/28 15:06:50 alibrary
21 Revision 1.43 2002/08/09 12:09:52 morsch
22 Direct gamma trigger correctly included.
24 Revision 1.42 2002/03/12 11:07:08 morsch
25 Add status code of particle to SetTrack call.
27 Revision 1.41 2002/03/05 11:25:33 morsch
28 - New quenching options
29 - Correction in CheckTrigger()
31 Revision 1.40 2002/02/12 11:05:53 morsch
32 Get daughter indices right.
34 Revision 1.39 2002/02/12 09:16:39 morsch
35 Correction in SelectFlavor()
37 Revision 1.38 2002/02/12 08:53:21 morsch
38 SetNoGammas can be used to inhibit writing of gammas and pi0.
40 Revision 1.37 2002/02/08 16:50:50 morsch
41 Add name and title in constructor.
43 Revision 1.36 2002/01/31 20:17:55 morsch
44 Allow for triggered jets with simplified topology: Exact pT, back-to-back
46 Revision 1.35 2001/12/13 07:56:25 hristov
47 Set pointers to zero in the default constructor
49 Revision 1.34 2001/12/11 16:55:42 morsch
50 Correct initialization for jet phi-range.
52 Revision 1.33 2001/12/05 10:18:51 morsch
53 Possibility of kinematic biasing of jet phi range. (J. Klay)
55 Revision 1.32 2001/11/28 13:51:11 morsch
56 Introduce kinematic biasing (etamin, etamax) of jet trigger. Bookkeeping
57 (number of trials) done in AliGenHijingEventHeader.
59 Revision 1.31 2001/11/06 12:30:34 morsch
60 Add Boost() method to boost all particles to LHC lab frame. Needed for asymmetric collision systems.
62 Revision 1.30 2001/10/21 18:35:56 hristov
63 Several pointers were set to zero in the default constructors to avoid memory management problems
65 Revision 1.29 2001/10/15 08:12:24 morsch
66 - Vertex smearing with truncated gaussian.
67 - Store triggered jet info before and after final state radiation into mc-heade
69 Revision 1.28 2001/10/08 11:55:25 morsch
70 Store 4-momenta of trigegred jets in event header.
71 Possibility to switch of initial and final state radiation.
73 Revision 1.27 2001/10/08 07:13:14 morsch
74 Add setter for minimum transverse momentum of triggered jet.
76 Revision 1.26 2001/10/04 08:12:24 morsch
77 Redefinition of stable condition.
79 Revision 1.25 2001/07/27 17:09:36 morsch
80 Use local SetTrack, KeepTrack and SetHighWaterMark methods
81 to delegate either to local stack or to stack owned by AliRun.
82 (Piotr Skowronski, A.M.)
84 Revision 1.24 2001/07/20 09:34:56 morsch
85 Count the number of spectator neutrons and protons and add information
86 to the event header. (Chiara Oppedisano)
88 Revision 1.23 2001/07/13 17:30:22 morsch
91 Revision 1.22 2001/06/11 13:09:23 morsch
92 - Store cross-Section and number of binary collisions as a function of impact parameter
93 - Pass AliGenHijingEventHeader to gAlice.
95 Revision 1.21 2001/02/28 17:35:24 morsch
96 Consider elastic interactions (ks = 1 and ks = 11) as spectator (Chiara Oppedisano)
98 Revision 1.20 2001/02/14 15:50:40 hristov
99 The last particle in event marked using SetHighWaterMark
101 Revision 1.19 2000/12/21 16:24:06 morsch
102 Coding convention clean-up
104 Revision 1.18 2000/12/06 17:46:30 morsch
105 Avoid random numbers 1 and 0.
107 Revision 1.17 2000/12/04 11:22:03 morsch
108 Init of sRandom as in 1.15
110 Revision 1.16 2000/12/02 11:41:39 morsch
111 Use SetRandom() to initialize random number generator in constructor.
113 Revision 1.15 2000/11/30 20:29:02 morsch
114 Initialise static variable sRandom in constructor: sRandom = fRandom;
116 Revision 1.14 2000/11/30 07:12:50 alibrary
117 Introducing new Rndm and QA classes
119 Revision 1.13 2000/11/09 17:40:27 morsch
120 Possibility to select/unselect spectator protons and neutrons.
121 Method SetSpectators(Int_t spect) added. (FCA, Ch. Oppedisano)
123 Revision 1.12 2000/10/20 13:38:38 morsch
124 Debug printouts commented.
126 Revision 1.11 2000/10/20 13:22:26 morsch
127 - skip particle type 92 (string)
128 - Charmed and beauty baryions (5122, 4122) are considered as stable consistent with
131 Revision 1.10 2000/10/17 15:10:20 morsch
132 Write first all the parent particles to the stack and then the final state particles.
134 Revision 1.9 2000/10/17 13:38:59 morsch
135 Protection against division by zero in EvaluateCrossSection() and KinematicSelection(..) (FCA)
137 Revision 1.8 2000/10/17 12:46:31 morsch
138 Protect EvaluateCrossSections() against division by zero.
140 Revision 1.7 2000/10/02 21:28:06 fca
141 Removal of useless dependecies via forward declarations
143 Revision 1.6 2000/09/11 13:23:37 morsch
144 Write last seed to file (fortran lun 50) and reed back from same lun using calls to
145 luget_hijing and luset_hijing.
147 Revision 1.5 2000/09/07 16:55:40 morsch
148 fHijing->Initialize(); after change of parameters. (Dmitri Yurevitch Peressounko)
150 Revision 1.4 2000/07/11 18:24:56 fca
151 Coding convention corrections + few minor bug fixes
153 Revision 1.3 2000/06/30 12:08:36 morsch
154 In member data: char* replaced by TString, Init takes care of resizing the strings to
155 8 characters required by Hijing.
157 Revision 1.2 2000/06/15 14:15:05 morsch
158 Add possibility for heavy flavor selection: charm and beauty.
160 Revision 1.1 2000/06/09 20:47:27 morsch
161 AliGenerator interface class to HIJING using THijing (test version)
167 // Generator using HIJING as an external generator
168 // The main HIJING options are accessable for the user through this interface.
169 // Uses the THijing implementation of TGenerator.
171 // andreas.morsch@cern.ch
173 #include "AliGenHijing.h"
174 #include "AliGenHijingEventHeader.h"
179 #include <TParticle.h>
182 #include <TLorentzVector.h>
185 ClassImp(AliGenHijing)
187 AliGenHijing::AliGenHijing()
197 AliGenHijing::AliGenHijing(Int_t npart)
200 // Default PbPb collisions at 5. 5 TeV
203 fTitle= "Particle Generator using HIJING";
206 SetImpactParameterRange();
231 fParticles = new TClonesArray("TParticle",10000);
233 // Set random number generator
239 AliGenHijing::AliGenHijing(const AliGenHijing & Hijing)
245 AliGenHijing::~AliGenHijing()
248 if ( fDsigmaDb) delete fDsigmaDb;
249 if ( fDnDb) delete fDnDb;
253 void AliGenHijing::Init()
258 fProjectile.Resize(8);
260 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
261 fAProjectile, fZProjectile, fATarget, fZTarget,
262 fMinImpactParam, fMaxImpactParam));
264 fHijing=(THijing*) fgMCEvGen;
265 fHijing->SetIHPR2(2, fRadiation);
266 fHijing->SetIHPR2(3, fTrigger);
267 fHijing->SetIHPR2(6, fShadowing);
268 fHijing->SetIHPR2(12, fDecaysOff);
269 fHijing->SetIHPR2(21, fKeep);
270 fHijing->SetHIPR1(10, fPtMinJet);
271 fHijing->SetHIPR1(50, fSimpleJet);
276 // fQuench = 0: no quenching
277 // fQuench = 1: hijing default
278 // fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
279 // fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
280 // fQuench = 4: new LHC parameters with log(e) dependence
281 // fQuench = 5: new RHIC parameters with log(e) dependence
282 fHijing->SetIHPR2(50, 0);
284 fHijing->SetIHPR2(4, 1);
286 fHijing->SetIHPR2(4, 0);
287 // New LHC parameters from Xin-Nian Wang
289 fHijing->SetHIPR1(14, 1.1);
290 fHijing->SetHIPR1(11, 3.7);
291 } else if (fQuench == 3) {
292 fHijing->SetHIPR1(14, 0.20);
293 fHijing->SetHIPR1(11, 2.5);
294 } else if (fQuench == 4) {
295 fHijing->SetIHPR2(50, 1);
296 fHijing->SetHIPR1(14, 4.*0.34);
297 fHijing->SetHIPR1(11, 3.7);
298 } else if (fQuench == 5) {
299 fHijing->SetIHPR2(50, 1);
300 fHijing->SetHIPR1(14, 0.34);
301 fHijing->SetHIPR1(11, 2.5);
309 fHijing->Initialize();
311 if (fEvaluate) EvaluateCrossSections();
314 // Initialize random generator
317 void AliGenHijing::Generate()
319 // Generate one event
321 Float_t polar[3] = {0,0,0};
322 Float_t origin[3] = {0,0,0};
323 Float_t origin0[3] = {0,0,0};
324 Float_t p[3], random[6];
327 // converts from mm/c to s
328 const Float_t kconv = 0.001/2.999792458e8;
332 Int_t j, kf, ks, imo;
338 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
339 if(fVertexSmear == kPerEvent) {
342 while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
344 for (j=0; j < 3; j++) {
345 dv[j] = fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
346 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
349 for (j=0; j < 3; j++) origin0[j] += dv[j];
350 } else if (fVertexSmear == kPerTrack) {
351 // fHijing->SetMSTP(151,0);
352 for (j = 0; j < 3; j++) {
353 // fHijing->SetPARP(151+j, fOsigma[j]*10.);
358 // Generate one event
359 // --------------------------------------------------------------------------
362 // --------------------------------------------------------------------------
363 fHijing->GenerateEvent();
365 fHijing->ImportParticles(fParticles,"All");
366 if (fTrigger != kNoTrigger) {
367 if (!CheckTrigger()) continue;
372 Int_t np = fParticles->GetEntriesFast();
373 printf("\n **************************************************%d\n",np);
375 if (np == 0 ) continue;
377 Int_t* newPos = new Int_t[np];
378 Int_t* pSelected = new Int_t[np];
380 for (i = 0; i < np; i++) {
387 TParticle * iparticle = (TParticle *) fParticles->At(0);
388 fEventVertex[0] = origin0[0];
389 fEventVertex[1] = origin0[1];
390 fEventVertex[2] = origin0[2];
393 // First select parent particles
396 for (i = 0; i < np; i++) {
397 iparticle = (TParticle *) fParticles->At(i);
399 // Is this a parent particle ?
400 if (Stable(iparticle)) continue;
402 Bool_t selected = kTRUE;
403 Bool_t hasSelectedDaughters = kFALSE;
406 kf = iparticle->GetPdgCode();
407 ks = iparticle->GetStatusCode();
408 if (kf == 92) continue;
410 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
412 hasSelectedDaughters = DaughtersSelection(iparticle);
414 // Put particle on the stack if it is either selected or
415 // it is the mother of at least one seleted particle
417 if (selected || hasSelectedDaughters) {
421 } // particle loop parents
423 // Now select the final state particles
426 for (i = 0; i<np; i++) {
427 TParticle * iparticle = (TParticle *) fParticles->At(i);
428 // Is this a final state particle ?
429 if (!Stable(iparticle)) continue;
431 Bool_t selected = kTRUE;
432 kf = iparticle->GetPdgCode();
433 ks = iparticle->GetStatusCode();
435 // --------------------------------------------------------------------------
436 // Count spectator neutrons and protons
437 if(ks == 0 || ks == 1 || ks == 10 || ks == 11){
438 if(kf == kNeutron) fSpecn += 1;
439 if(kf == kProton) fSpecp += 1;
441 // --------------------------------------------------------------------------
444 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
445 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
449 // Put particle on the stack if selected
455 } // particle loop final state
457 // Write particles to stack
459 for (i = 0; i<np; i++) {
460 TParticle * iparticle = (TParticle *) fParticles->At(i);
461 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
462 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
465 kf = iparticle->GetPdgCode();
466 ks = iparticle->GetStatusCode();
467 p[0] = iparticle->Px();
468 p[1] = iparticle->Py();
469 p[2] = iparticle->Pz();
470 origin[0] = origin0[0]+iparticle->Vx()/10;
471 origin[1] = origin0[1]+iparticle->Vy()/10;
472 origin[2] = origin0[2]+iparticle->Vz()/10;
473 tof = kconv*iparticle->T();
475 TParticle* mother = 0;
477 imo = iparticle->GetFirstMother();
478 mother = (TParticle *) fParticles->At(imo);
479 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
481 Bool_t tFlag = (fTrackIt && !hasDaughter);
482 SetTrack(tFlag,imo,kf,p,origin,polar,
483 tof,kPNoProcess,nt, 1., ks);
491 printf("\n I've put %i particles on the stack \n",nc);
494 if (jev >= fNpart || fNpart == -1) {
495 fKineBias = Float_t(fNpart)/Float_t(fTrials);
496 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
502 SetHighWaterMark(nt);
505 void AliGenHijing::KeepFullEvent()
510 void AliGenHijing::EvaluateCrossSections()
512 // Glauber Calculation of geometrical x-section
514 Float_t xTot = 0.; // barn
515 Float_t xTotHard = 0.; // barn
516 Float_t xPart = 0.; // barn
517 Float_t xPartHard = 0.; // barn
518 Float_t sigmaHard = 0.1; // mbarn
520 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
521 const Float_t kdib = 0.2;
522 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
525 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
526 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
528 Float_t oldvalue= 0.;
530 Float_t* b = new Float_t[kMax];
531 Float_t* si1 = new Float_t[kMax];
532 Float_t* si2 = new Float_t[kMax];
534 for (i = 0; i < kMax; i++)
536 Float_t xb = bMin+i*kdib;
538 ov=fHijing->Profile(xb);
539 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
540 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
543 if (xb > fMinImpactParam && xb < fMaxImpactParam)
549 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
551 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
552 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
560 printf("\n Total cross section (barn): %f \n",xTot);
561 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
562 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
563 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
565 // Store result as a graph
570 fDsigmaDb = new TGraph(i, b, si1);
571 fDnDb = new TGraph(i, b, si2);
574 Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
577 // Looks recursively if one of the daughters has been selected
579 // printf("\n Consider daughters %d:",iparticle->GetPdgCode());
583 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
584 Bool_t selected = kFALSE;
586 imin = iparticle->GetFirstDaughter();
587 imax = iparticle->GetLastDaughter();
588 for (i = imin; i <= imax; i++){
589 TParticle * jparticle = (TParticle *) fParticles->At(i);
590 Int_t ip = jparticle->GetPdgCode();
591 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
592 selected=kTRUE; break;
594 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
603 Bool_t AliGenHijing::SelectFlavor(Int_t pid)
605 // Select flavor of particle
607 // 4: charm and beauty
614 Int_t ifl = TMath::Abs(pid/100);
615 if (ifl > 10) ifl/=10;
616 res = (fFlavor == ifl);
619 // This part if gamma writing is inhibited
621 res = res && (pid != kGamma && pid != kPi0);
626 Bool_t AliGenHijing::Stable(TParticle* particle)
628 // Return true for a stable particle
631 if (particle->GetFirstDaughter() < 0 )
640 void AliGenHijing::Boost()
643 // Boost cms into LHC lab frame
645 Double_t dy = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
646 (Double_t(fZTarget) * Double_t(fAProjectile)));
647 Double_t beta = TMath::TanH(dy);
648 Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
649 Double_t gb = gamma * beta;
651 printf("\n Boosting particles to lab frame %f %f %f", dy, beta, gamma);
654 Int_t np = fParticles->GetEntriesFast();
655 for (i = 0; i < np; i++)
657 TParticle* iparticle = (TParticle*) fParticles->At(i);
659 Double_t e = iparticle->Energy();
660 Double_t px = iparticle->Px();
661 Double_t py = iparticle->Py();
662 Double_t pz = iparticle->Pz();
664 Double_t eb = gamma * e - gb * pz;
665 Double_t pzb = -gb * e + gamma * pz;
667 iparticle->SetMomentum(px, py, pzb, eb);
672 void AliGenHijing::MakeHeader()
674 // Builds the event header, to be called after each event
675 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
676 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
677 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
678 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
679 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
680 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
681 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
685 ((AliGenHijingEventHeader*) header)->SetSpectators(fSpecn, fSpecp);
687 // 4-momentum vectors of the triggered jets.
689 // Before final state gluon radiation.
690 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
691 fHijing->GetHINT1(22),
692 fHijing->GetHINT1(23),
693 fHijing->GetHINT1(24));
695 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
696 fHijing->GetHINT1(32),
697 fHijing->GetHINT1(33),
698 fHijing->GetHINT1(34));
699 // After final state gluon radiation.
700 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
701 fHijing->GetHINT1(27),
702 fHijing->GetHINT1(28),
703 fHijing->GetHINT1(29));
705 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
706 fHijing->GetHINT1(37),
707 fHijing->GetHINT1(38),
708 fHijing->GetHINT1(39));
709 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
710 // Bookkeeping for kinematic bias
711 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
713 header->SetPrimaryVertex(fEventVertex);
714 gAlice->SetGenEventHeader(header);
717 Bool_t AliGenHijing::CheckTrigger()
719 // Check the kinematic trigger condition
721 Bool_t triggered = kFALSE;
727 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
728 fHijing->GetHINT1(27),
729 fHijing->GetHINT1(28),
730 fHijing->GetHINT1(29));
732 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
733 fHijing->GetHINT1(37),
734 fHijing->GetHINT1(38),
735 fHijing->GetHINT1(39));
736 Double_t eta1 = jet1->Eta();
737 Double_t eta2 = jet2->Eta();
738 Double_t phi1 = jet1->Phi();
739 Double_t phi2 = jet2->Phi();
740 // printf("\n Trigger: %f %f %f %f",
741 // fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
743 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
744 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
746 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
747 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
750 } else if (fTrigger == 2) {
753 Int_t np = fParticles->GetEntriesFast();
754 for (Int_t i = 0; i < np; i++) {
755 TParticle* part = (TParticle*) fParticles->At(i);
756 Int_t kf = part->GetPdgCode();
757 Int_t ks = part->GetStatusCode();
758 if (kf == 22 && ks == 40) {
759 Float_t phi = part->Phi();
760 Float_t eta = part->Eta();
761 if (eta < fEtaMaxJet &&
767 } // check phi,eta within limits
777 AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
779 // Assignment operator
784 # define rluget_hijing rluget_hijing_
785 # define rluset_hijing rluset_hijing_
786 # define rlu_hijing rlu_hijing_
787 # define type_of_call
789 # define rluget_hijing RLUGET_HIJING
790 # define rluset_hijing RLUSET_HIJING
791 # define rlu_hijing RLU_HIJING
792 # define type_of_call _stdcall
797 void type_of_call rluget_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
798 {printf("Dummy version of rluget_hijing reached\n");}
800 void type_of_call rluset_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
801 {printf("Dummy version of rluset_hijing reached\n");}
803 Double_t type_of_call rlu_hijing(Int_t & /*idum*/)
806 do r=sRandom->Rndm(); while(0 >= r || r >= 1);