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 1.40 2002/02/12 11:05:53 morsch
19 Get daughter indices right.
21 Revision 1.39 2002/02/12 09:16:39 morsch
22 Correction in SelectFlavor()
24 Revision 1.38 2002/02/12 08:53:21 morsch
25 SetNoGammas can be used to inhibit writing of gammas and pi0.
27 Revision 1.37 2002/02/08 16:50:50 morsch
28 Add name and title in constructor.
30 Revision 1.36 2002/01/31 20:17:55 morsch
31 Allow for triggered jets with simplified topology: Exact pT, back-to-back
33 Revision 1.35 2001/12/13 07:56:25 hristov
34 Set pointers to zero in the default constructor
36 Revision 1.34 2001/12/11 16:55:42 morsch
37 Correct initialization for jet phi-range.
39 Revision 1.33 2001/12/05 10:18:51 morsch
40 Possibility of kinematic biasing of jet phi range. (J. Klay)
42 Revision 1.32 2001/11/28 13:51:11 morsch
43 Introduce kinematic biasing (etamin, etamax) of jet trigger. Bookkeeping
44 (number of trials) done in AliGenHijingEventHeader.
46 Revision 1.31 2001/11/06 12:30:34 morsch
47 Add Boost() method to boost all particles to LHC lab frame. Needed for asymmetric collision systems.
49 Revision 1.30 2001/10/21 18:35:56 hristov
50 Several pointers were set to zero in the default constructors to avoid memory management problems
52 Revision 1.29 2001/10/15 08:12:24 morsch
53 - Vertex smearing with truncated gaussian.
54 - Store triggered jet info before and after final state radiation into mc-heade
56 Revision 1.28 2001/10/08 11:55:25 morsch
57 Store 4-momenta of trigegred jets in event header.
58 Possibility to switch of initial and final state radiation.
60 Revision 1.27 2001/10/08 07:13:14 morsch
61 Add setter for minimum transverse momentum of triggered jet.
63 Revision 1.26 2001/10/04 08:12:24 morsch
64 Redefinition of stable condition.
66 Revision 1.25 2001/07/27 17:09:36 morsch
67 Use local SetTrack, KeepTrack and SetHighWaterMark methods
68 to delegate either to local stack or to stack owned by AliRun.
69 (Piotr Skowronski, A.M.)
71 Revision 1.24 2001/07/20 09:34:56 morsch
72 Count the number of spectator neutrons and protons and add information
73 to the event header. (Chiara Oppedisano)
75 Revision 1.23 2001/07/13 17:30:22 morsch
78 Revision 1.22 2001/06/11 13:09:23 morsch
79 - Store cross-Section and number of binary collisions as a function of impact parameter
80 - Pass AliGenHijingEventHeader to gAlice.
82 Revision 1.21 2001/02/28 17:35:24 morsch
83 Consider elastic interactions (ks = 1 and ks = 11) as spectator (Chiara Oppedisano)
85 Revision 1.20 2001/02/14 15:50:40 hristov
86 The last particle in event marked using SetHighWaterMark
88 Revision 1.19 2000/12/21 16:24:06 morsch
89 Coding convention clean-up
91 Revision 1.18 2000/12/06 17:46:30 morsch
92 Avoid random numbers 1 and 0.
94 Revision 1.17 2000/12/04 11:22:03 morsch
95 Init of sRandom as in 1.15
97 Revision 1.16 2000/12/02 11:41:39 morsch
98 Use SetRandom() to initialize random number generator in constructor.
100 Revision 1.15 2000/11/30 20:29:02 morsch
101 Initialise static variable sRandom in constructor: sRandom = fRandom;
103 Revision 1.14 2000/11/30 07:12:50 alibrary
104 Introducing new Rndm and QA classes
106 Revision 1.13 2000/11/09 17:40:27 morsch
107 Possibility to select/unselect spectator protons and neutrons.
108 Method SetSpectators(Int_t spect) added. (FCA, Ch. Oppedisano)
110 Revision 1.12 2000/10/20 13:38:38 morsch
111 Debug printouts commented.
113 Revision 1.11 2000/10/20 13:22:26 morsch
114 - skip particle type 92 (string)
115 - Charmed and beauty baryions (5122, 4122) are considered as stable consistent with
118 Revision 1.10 2000/10/17 15:10:20 morsch
119 Write first all the parent particles to the stack and then the final state particles.
121 Revision 1.9 2000/10/17 13:38:59 morsch
122 Protection against division by zero in EvaluateCrossSection() and KinematicSelection(..) (FCA)
124 Revision 1.8 2000/10/17 12:46:31 morsch
125 Protect EvaluateCrossSections() against division by zero.
127 Revision 1.7 2000/10/02 21:28:06 fca
128 Removal of useless dependecies via forward declarations
130 Revision 1.6 2000/09/11 13:23:37 morsch
131 Write last seed to file (fortran lun 50) and reed back from same lun using calls to
132 luget_hijing and luset_hijing.
134 Revision 1.5 2000/09/07 16:55:40 morsch
135 fHijing->Initialize(); after change of parameters. (Dmitri Yurevitch Peressounko)
137 Revision 1.4 2000/07/11 18:24:56 fca
138 Coding convention corrections + few minor bug fixes
140 Revision 1.3 2000/06/30 12:08:36 morsch
141 In member data: char* replaced by TString, Init takes care of resizing the strings to
142 8 characters required by Hijing.
144 Revision 1.2 2000/06/15 14:15:05 morsch
145 Add possibility for heavy flavor selection: charm and beauty.
147 Revision 1.1 2000/06/09 20:47:27 morsch
148 AliGenerator interface class to HIJING using THijing (test version)
154 // Generator using HIJING as an external generator
155 // The main HIJING options are accessable for the user through this interface.
156 // Uses the THijing implementation of TGenerator.
158 // andreas.morsch@cern.ch
160 #include "AliGenHijing.h"
161 #include "AliGenHijingEventHeader.h"
166 #include <TParticle.h>
169 #include <TLorentzVector.h>
172 ClassImp(AliGenHijing)
174 AliGenHijing::AliGenHijing()
183 AliGenHijing::AliGenHijing(Int_t npart)
186 // Default PbPb collisions at 5. 5 TeV
189 fTitle= "Particle Generator using HIJING";
192 SetImpactParameterRange();
218 // Set random number generator
224 AliGenHijing::AliGenHijing(const AliGenHijing & Hijing)
230 AliGenHijing::~AliGenHijing()
233 if ( fDsigmaDb) delete fDsigmaDb;
234 if ( fDnDb) delete fDnDb;
237 void AliGenHijing::Init()
242 fProjectile.Resize(8);
244 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
245 fAProjectile, fZProjectile, fATarget, fZTarget,
246 fMinImpactParam, fMaxImpactParam));
248 fHijing=(THijing*) fgMCEvGen;
249 fHijing->SetIHPR2(2, fRadiation);
250 fHijing->SetIHPR2(3, fTrigger);
251 fHijing->SetIHPR2(6, fShadowing);
252 fHijing->SetIHPR2(12, fDecaysOff);
253 fHijing->SetIHPR2(21, fKeep);
254 fHijing->SetHIPR1(10, fPtMinJet);
255 fHijing->SetHIPR1(50, fSimpleJet);
260 // fQuench = 0: no quenching
261 // fQuench = 1: hijing default
262 // fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
263 // fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
264 // fQuench = 4: new LHC parameters with log(e) dependence
265 // fQuench = 5: new RHIC parameters with log(e) dependence
266 fHijing->SetIHPR2(50, 0);
268 fHijing->SetIHPR2(4, 1);
270 fHijing->SetIHPR2(4, 0);
271 // New LHC parameters from Xin-Nian Wang
273 fHijing->SetHIPR1(14, 1.1);
274 fHijing->SetHIPR1(11, 3.7);
275 } else if (fQuench == 3) {
276 fHijing->SetHIPR1(14, 0.20);
277 fHijing->SetHIPR1(11, 2.5);
278 } else if (fQuench == 4) {
279 fHijing->SetIHPR2(50, 1);
280 fHijing->SetHIPR1(14, 4.*0.34);
281 fHijing->SetHIPR1(11, 3.7);
282 } else if (fQuench == 5) {
283 fHijing->SetIHPR2(50, 1);
284 fHijing->SetHIPR1(14, 0.34);
285 fHijing->SetHIPR1(11, 2.5);
293 fHijing->Initialize();
295 if (fEvaluate) EvaluateCrossSections();
298 // Initialize random generator
301 void AliGenHijing::Generate()
303 // Generate one event
305 Float_t polar[3] = {0,0,0};
306 Float_t origin[3] = {0,0,0};
307 Float_t origin0[3] = {0,0,0};
308 Float_t p[3], random[6];
311 static TClonesArray *particles;
312 // converts from mm/c to s
313 const Float_t kconv = 0.001/2.999792458e8;
317 Int_t j, kf, ks, imo;
320 if(!particles) particles = new TClonesArray("TParticle",10000);
323 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
324 if(fVertexSmear == kPerEvent) {
327 while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
329 for (j=0; j < 3; j++) {
330 dv[j] = fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
331 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
334 for (j=0; j < 3; j++) origin0[j] += dv[j];
335 } else if (fVertexSmear == kPerTrack) {
336 // fHijing->SetMSTP(151,0);
337 for (j = 0; j < 3; j++) {
338 // fHijing->SetPARP(151+j, fOsigma[j]*10.);
343 // Generate one event
344 // --------------------------------------------------------------------------
347 // --------------------------------------------------------------------------
348 fHijing->GenerateEvent();
350 if (fTrigger != kNoTrigger) {
351 if (!CheckTrigger()) continue;
354 fHijing->ImportParticles(particles,"All");
355 if (fLHC) Boost(particles);
358 Int_t np = particles->GetEntriesFast();
359 printf("\n **************************************************%d\n",np);
361 if (np == 0 ) continue;
363 Int_t* newPos = new Int_t[np];
364 Int_t* pSelected = new Int_t[np];
366 for (i = 0; i < np; i++) {
373 TParticle * iparticle = (TParticle *) particles->At(0);
374 fEventVertex[0] = origin0[0];
375 fEventVertex[1] = origin0[1];
376 fEventVertex[2] = origin0[2];
379 // First select parent particles
382 for (i = 0; i < np; i++) {
383 iparticle = (TParticle *) particles->At(i);
384 // Is this a parent particle ?
385 if (Stable(iparticle)) continue;
387 Bool_t selected = kTRUE;
388 Bool_t hasSelectedDaughters = kFALSE;
391 kf = iparticle->GetPdgCode();
392 ks = iparticle->GetStatusCode();
393 if (kf == 92) continue;
395 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
397 hasSelectedDaughters = DaughtersSelection(iparticle, particles);
399 // Put particle on the stack if it is either selected or
400 // it is the mother of at least one seleted particle
402 if (selected || hasSelectedDaughters) {
406 } // particle loop parents
408 // Now select the final state particles
411 for (i = 0; i<np; i++) {
412 TParticle * iparticle = (TParticle *) particles->At(i);
413 // Is this a final state particle ?
414 if (!Stable(iparticle)) continue;
416 Bool_t selected = kTRUE;
417 kf = iparticle->GetPdgCode();
418 ks = iparticle->GetStatusCode();
419 // --------------------------------------------------------------------------
420 // Count spectator neutrons and protons
421 if(ks == 0 || ks == 1 || ks == 10 || ks == 11){
422 if(kf == kNeutron) fSpecn += 1;
423 if(kf == kProton) fSpecp += 1;
425 // --------------------------------------------------------------------------
428 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
429 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
433 // Put particle on the stack if selected
439 } // particle loop final state
441 // Write particles to stack
443 for (i = 0; i<np; i++) {
444 TParticle * iparticle = (TParticle *) particles->At(i);
445 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
446 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
449 kf = iparticle->GetPdgCode();
450 p[0] = iparticle->Px();
451 p[1] = iparticle->Py();
452 p[2] = iparticle->Pz();
453 origin[0] = origin0[0]+iparticle->Vx()/10;
454 origin[1] = origin0[1]+iparticle->Vy()/10;
455 origin[2] = origin0[2]+iparticle->Vz()/10;
456 tof = kconv*iparticle->T();
458 TParticle* mother = 0;
460 imo = iparticle->GetFirstMother();
461 mother = (TParticle *) particles->At(imo);
462 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
464 Bool_t tFlag = (fTrackIt && !hasDaughter);
465 SetTrack(tFlag,imo,kf,p,origin,polar,
474 printf("\n I've put %i particles on the stack \n",nc);
477 if (jev >= fNpart || fNpart == -1) {
478 fKineBias = Float_t(fNpart)/Float_t(fTrials);
479 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
485 SetHighWaterMark(nt);
488 void AliGenHijing::KeepFullEvent()
493 void AliGenHijing::EvaluateCrossSections()
495 // Glauber Calculation of geometrical x-section
497 Float_t xTot = 0.; // barn
498 Float_t xTotHard = 0.; // barn
499 Float_t xPart = 0.; // barn
500 Float_t xPartHard = 0.; // barn
501 Float_t sigmaHard = 0.1; // mbarn
503 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
504 const Float_t kdib = 0.2;
505 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
508 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
509 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
511 Float_t oldvalue= 0.;
513 Float_t* b = new Float_t[kMax];
514 Float_t* si1 = new Float_t[kMax];
515 Float_t* si2 = new Float_t[kMax];
517 for (i = 0; i < kMax; i++)
519 Float_t xb = bMin+i*kdib;
521 ov=fHijing->Profile(xb);
522 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
523 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
526 if (xb > fMinImpactParam && xb < fMaxImpactParam)
532 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
534 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
535 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
543 printf("\n Total cross section (barn): %f \n",xTot);
544 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
545 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
546 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
548 // Store result as a graph
553 fDsigmaDb = new TGraph(i, b, si1);
554 fDnDb = new TGraph(i, b, si2);
557 Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle, TClonesArray* particles)
560 // Looks recursively if one of the daughters has been selected
562 // printf("\n Consider daughters %d:",iparticle->GetPdgCode());
566 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
567 Bool_t selected = kFALSE;
569 imin = iparticle->GetFirstDaughter();
570 imax = iparticle->GetLastDaughter();
571 for (i = imin; i <= imax; i++){
572 TParticle * jparticle = (TParticle *) particles->At(i);
573 Int_t ip = jparticle->GetPdgCode();
574 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
575 selected=kTRUE; break;
577 if (DaughtersSelection(jparticle, particles)) {selected=kTRUE; break; }
586 Bool_t AliGenHijing::SelectFlavor(Int_t pid)
588 // Select flavor of particle
590 // 4: charm and beauty
597 Int_t ifl = TMath::Abs(pid/100);
598 if (ifl > 10) ifl/=10;
599 res = (fFlavor == ifl);
602 // This part if gamma writing is inhibited
604 res = res && (pid != kGamma && pid != kPi0);
609 Bool_t AliGenHijing::Stable(TParticle* particle)
611 // Return true for a stable particle
614 if (particle->GetFirstDaughter() < 0 )
623 void AliGenHijing::Boost(TClonesArray* particles)
626 // Boost cms into LHC lab frame
628 Double_t dy = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
629 (Double_t(fZTarget) * Double_t(fAProjectile)));
630 Double_t beta = TMath::TanH(dy);
631 Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
632 Double_t gb = gamma * beta;
634 printf("\n Boosting particles to lab frame %f %f %f", dy, beta, gamma);
637 Int_t np = particles->GetEntriesFast();
638 for (i = 0; i < np; i++)
640 TParticle* iparticle = (TParticle*) particles->At(i);
642 Double_t e = iparticle->Energy();
643 Double_t px = iparticle->Px();
644 Double_t py = iparticle->Py();
645 Double_t pz = iparticle->Pz();
647 Double_t eb = gamma * e - gb * pz;
648 Double_t pzb = -gb * e + gamma * pz;
650 iparticle->SetMomentum(px, py, pzb, eb);
655 void AliGenHijing::MakeHeader()
657 // Builds the event header, to be called after each event
658 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
659 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
660 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
661 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
662 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
663 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
664 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
668 ((AliGenHijingEventHeader*) header)->SetSpectators(fSpecn, fSpecp);
670 // 4-momentum vectors of the triggered jets.
672 // Before final state gluon radiation.
673 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
674 fHijing->GetHINT1(22),
675 fHijing->GetHINT1(23),
676 fHijing->GetHINT1(24));
678 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
679 fHijing->GetHINT1(32),
680 fHijing->GetHINT1(33),
681 fHijing->GetHINT1(34));
682 // After final state gluon radiation.
683 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
684 fHijing->GetHINT1(27),
685 fHijing->GetHINT1(28),
686 fHijing->GetHINT1(29));
688 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
689 fHijing->GetHINT1(37),
690 fHijing->GetHINT1(38),
691 fHijing->GetHINT1(39));
692 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
693 // Bookkeeping for kinematic bias
694 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
696 header->SetPrimaryVertex(fEventVertex);
697 gAlice->SetGenEventHeader(header);
700 Bool_t AliGenHijing::CheckTrigger()
702 // Check the kinematic trigger condition
704 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
705 fHijing->GetHINT1(27),
706 fHijing->GetHINT1(28),
707 fHijing->GetHINT1(29));
709 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
710 fHijing->GetHINT1(37),
711 fHijing->GetHINT1(38),
712 fHijing->GetHINT1(39));
713 Double_t eta1 = jet1->Eta();
714 Double_t eta2 = jet2->Eta();
715 Double_t phi1 = jet1->Phi();
716 Double_t phi2 = jet2->Phi();
717 Bool_t triggered = kFALSE;
718 // printf("\n Trigger: %f %f %f %f",
719 // fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
720 // printf("\n Jet1: %f %f", phi1, eta1);
721 // printf("\n Jet2: %f %f", phi2, eta2);
725 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
726 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
728 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
729 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
739 AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
741 // Assignment operator
746 # define rluget_hijing rluget_hijing_
747 # define rluset_hijing rluset_hijing_
748 # define rlu_hijing rlu_hijing_
749 # define type_of_call
751 # define rluget_hijing RLUGET_HIJING
752 # define rluset_hijing RLUSET_HIJING
753 # define rlu_hijing RLU_HIJING
754 # define type_of_call _stdcall
759 void type_of_call rluget_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
760 {printf("Dummy version of rluget_hijing reached\n");}
762 void type_of_call rluset_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
763 {printf("Dummy version of rluset_hijing reached\n");}
765 Double_t type_of_call rlu_hijing(Int_t & /*idum*/)
768 do r=sRandom->Rndm(); while(0 >= r || r >= 1);