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 1.45 2002/12/16 09:44:49 morsch
19 Default for fRadiation is 3.
21 Revision 1.44 2002/10/14 14:55:35 hristov
22 Merging the VirtualMC branch to the main development branch (HEAD)
24 Revision 1.42.4.1 2002/08/28 15:06:50 alibrary
27 Revision 1.43 2002/08/09 12:09:52 morsch
28 Direct gamma trigger correctly included.
30 Revision 1.42 2002/03/12 11:07:08 morsch
31 Add status code of particle to SetTrack call.
33 Revision 1.41 2002/03/05 11:25:33 morsch
34 - New quenching options
35 - Correction in CheckTrigger()
37 Revision 1.40 2002/02/12 11:05:53 morsch
38 Get daughter indices right.
40 Revision 1.39 2002/02/12 09:16:39 morsch
41 Correction in SelectFlavor()
43 Revision 1.38 2002/02/12 08:53:21 morsch
44 SetNoGammas can be used to inhibit writing of gammas and pi0.
46 Revision 1.37 2002/02/08 16:50:50 morsch
47 Add name and title in constructor.
49 Revision 1.36 2002/01/31 20:17:55 morsch
50 Allow for triggered jets with simplified topology: Exact pT, back-to-back
52 Revision 1.35 2001/12/13 07:56:25 hristov
53 Set pointers to zero in the default constructor
55 Revision 1.34 2001/12/11 16:55:42 morsch
56 Correct initialization for jet phi-range.
58 Revision 1.33 2001/12/05 10:18:51 morsch
59 Possibility of kinematic biasing of jet phi range. (J. Klay)
61 Revision 1.32 2001/11/28 13:51:11 morsch
62 Introduce kinematic biasing (etamin, etamax) of jet trigger. Bookkeeping
63 (number of trials) done in AliGenHijingEventHeader.
65 Revision 1.31 2001/11/06 12:30:34 morsch
66 Add Boost() method to boost all particles to LHC lab frame. Needed for asymmetric collision systems.
68 Revision 1.30 2001/10/21 18:35:56 hristov
69 Several pointers were set to zero in the default constructors to avoid memory management problems
71 Revision 1.29 2001/10/15 08:12:24 morsch
72 - Vertex smearing with truncated gaussian.
73 - Store triggered jet info before and after final state radiation into mc-heade
75 Revision 1.28 2001/10/08 11:55:25 morsch
76 Store 4-momenta of trigegred jets in event header.
77 Possibility to switch of initial and final state radiation.
79 Revision 1.27 2001/10/08 07:13:14 morsch
80 Add setter for minimum transverse momentum of triggered jet.
82 Revision 1.26 2001/10/04 08:12:24 morsch
83 Redefinition of stable condition.
85 Revision 1.25 2001/07/27 17:09:36 morsch
86 Use local SetTrack, KeepTrack and SetHighWaterMark methods
87 to delegate either to local stack or to stack owned by AliRun.
88 (Piotr Skowronski, A.M.)
90 Revision 1.24 2001/07/20 09:34:56 morsch
91 Count the number of spectator neutrons and protons and add information
92 to the event header. (Chiara Oppedisano)
94 Revision 1.23 2001/07/13 17:30:22 morsch
97 Revision 1.22 2001/06/11 13:09:23 morsch
98 - Store cross-Section and number of binary collisions as a function of impact parameter
99 - Pass AliGenHijingEventHeader to gAlice.
101 Revision 1.21 2001/02/28 17:35:24 morsch
102 Consider elastic interactions (ks = 1 and ks = 11) as spectator (Chiara Oppedisano)
104 Revision 1.20 2001/02/14 15:50:40 hristov
105 The last particle in event marked using SetHighWaterMark
107 Revision 1.19 2000/12/21 16:24:06 morsch
108 Coding convention clean-up
110 Revision 1.18 2000/12/06 17:46:30 morsch
111 Avoid random numbers 1 and 0.
113 Revision 1.17 2000/12/04 11:22:03 morsch
114 Init of sRandom as in 1.15
116 Revision 1.16 2000/12/02 11:41:39 morsch
117 Use SetRandom() to initialize random number generator in constructor.
119 Revision 1.15 2000/11/30 20:29:02 morsch
120 Initialise static variable sRandom in constructor: sRandom = fRandom;
122 Revision 1.14 2000/11/30 07:12:50 alibrary
123 Introducing new Rndm and QA classes
125 Revision 1.13 2000/11/09 17:40:27 morsch
126 Possibility to select/unselect spectator protons and neutrons.
127 Method SetSpectators(Int_t spect) added. (FCA, Ch. Oppedisano)
129 Revision 1.12 2000/10/20 13:38:38 morsch
130 Debug printouts commented.
132 Revision 1.11 2000/10/20 13:22:26 morsch
133 - skip particle type 92 (string)
134 - Charmed and beauty baryions (5122, 4122) are considered as stable consistent with
137 Revision 1.10 2000/10/17 15:10:20 morsch
138 Write first all the parent particles to the stack and then the final state particles.
140 Revision 1.9 2000/10/17 13:38:59 morsch
141 Protection against division by zero in EvaluateCrossSection() and KinematicSelection(..) (FCA)
143 Revision 1.8 2000/10/17 12:46:31 morsch
144 Protect EvaluateCrossSections() against division by zero.
146 Revision 1.7 2000/10/02 21:28:06 fca
147 Removal of useless dependecies via forward declarations
149 Revision 1.6 2000/09/11 13:23:37 morsch
150 Write last seed to file (fortran lun 50) and reed back from same lun using calls to
151 luget_hijing and luset_hijing.
153 Revision 1.5 2000/09/07 16:55:40 morsch
154 fHijing->Initialize(); after change of parameters. (Dmitri Yurevitch Peressounko)
156 Revision 1.4 2000/07/11 18:24:56 fca
157 Coding convention corrections + few minor bug fixes
159 Revision 1.3 2000/06/30 12:08:36 morsch
160 In member data: char* replaced by TString, Init takes care of resizing the strings to
161 8 characters required by Hijing.
163 Revision 1.2 2000/06/15 14:15:05 morsch
164 Add possibility for heavy flavor selection: charm and beauty.
166 Revision 1.1 2000/06/09 20:47:27 morsch
167 AliGenerator interface class to HIJING using THijing (test version)
173 // Generator using HIJING as an external generator
174 // The main HIJING options are accessable for the user through this interface.
175 // Uses the THijing implementation of TGenerator.
177 // andreas.morsch@cern.ch
179 #include "AliGenHijing.h"
180 #include "AliGenHijingEventHeader.h"
185 #include <TParticle.h>
188 #include <TLorentzVector.h>
191 ClassImp(AliGenHijing)
193 AliGenHijing::AliGenHijing()
203 AliGenHijing::AliGenHijing(Int_t npart)
206 // Default PbPb collisions at 5. 5 TeV
209 fTitle= "Particle Generator using HIJING";
212 SetImpactParameterRange();
237 fParticles = new TClonesArray("TParticle",10000);
239 // Set random number generator
245 AliGenHijing::AliGenHijing(const AliGenHijing & Hijing)
251 AliGenHijing::~AliGenHijing()
254 if ( fDsigmaDb) delete fDsigmaDb;
255 if ( fDnDb) delete fDnDb;
259 void AliGenHijing::Init()
264 fProjectile.Resize(8);
266 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
267 fAProjectile, fZProjectile, fATarget, fZTarget,
268 fMinImpactParam, fMaxImpactParam));
270 fHijing=(THijing*) fgMCEvGen;
271 fHijing->SetIHPR2(2, fRadiation);
272 fHijing->SetIHPR2(3, fTrigger);
273 fHijing->SetIHPR2(6, fShadowing);
274 fHijing->SetIHPR2(12, fDecaysOff);
275 fHijing->SetIHPR2(21, fKeep);
276 fHijing->SetHIPR1(10, fPtMinJet);
277 fHijing->SetHIPR1(50, fSimpleJet);
282 // fQuench = 0: no quenching
283 // fQuench = 1: hijing default
284 // fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
285 // fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
286 // fQuench = 4: new LHC parameters with log(e) dependence
287 // fQuench = 5: new RHIC parameters with log(e) dependence
288 fHijing->SetIHPR2(50, 0);
290 fHijing->SetIHPR2(4, 1);
292 fHijing->SetIHPR2(4, 0);
293 // New LHC parameters from Xin-Nian Wang
295 fHijing->SetHIPR1(14, 1.1);
296 fHijing->SetHIPR1(11, 3.7);
297 } else if (fQuench == 3) {
298 fHijing->SetHIPR1(14, 0.20);
299 fHijing->SetHIPR1(11, 2.5);
300 } else if (fQuench == 4) {
301 fHijing->SetIHPR2(50, 1);
302 fHijing->SetHIPR1(14, 4.*0.34);
303 fHijing->SetHIPR1(11, 3.7);
304 } else if (fQuench == 5) {
305 fHijing->SetIHPR2(50, 1);
306 fHijing->SetHIPR1(14, 0.34);
307 fHijing->SetHIPR1(11, 2.5);
315 fHijing->Initialize();
317 if (fEvaluate) EvaluateCrossSections();
321 void AliGenHijing::Generate()
323 // Generate one event
325 Float_t polar[3] = {0,0,0};
326 Float_t origin[3] = {0,0,0};
327 Float_t origin0[3] = {0,0,0};
328 Float_t p[3], random[6];
331 // converts from mm/c to s
332 const Float_t kconv = 0.001/2.999792458e8;
336 Int_t j, kf, ks, imo;
342 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
343 if(fVertexSmear == kPerEvent) {
346 while(TMath::Abs(dv[2]) > fCutVertexZ*fOsigma[2]) {
348 for (j=0; j < 3; j++) {
349 dv[j] = fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
350 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
353 for (j=0; j < 3; j++) origin0[j] += dv[j];
354 } else if (fVertexSmear == kPerTrack) {
355 // fHijing->SetMSTP(151,0);
356 for (j = 0; j < 3; j++) {
357 // fHijing->SetPARP(151+j, fOsigma[j]*10.);
362 // Generate one event
363 // --------------------------------------------------------------------------
366 // --------------------------------------------------------------------------
367 fHijing->GenerateEvent();
369 fHijing->ImportParticles(fParticles,"All");
370 if (fTrigger != kNoTrigger) {
371 if (!CheckTrigger()) continue;
376 Int_t np = fParticles->GetEntriesFast();
377 printf("\n **************************************************%d\n",np);
379 if (np == 0 ) continue;
381 Int_t* newPos = new Int_t[np];
382 Int_t* pSelected = new Int_t[np];
384 for (i = 0; i < np; i++) {
391 TParticle * iparticle = (TParticle *) fParticles->At(0);
392 fEventVertex[0] = origin0[0];
393 fEventVertex[1] = origin0[1];
394 fEventVertex[2] = origin0[2];
397 // First select parent particles
400 for (i = 0; i < np; i++) {
401 iparticle = (TParticle *) fParticles->At(i);
403 // Is this a parent particle ?
404 if (Stable(iparticle)) continue;
406 Bool_t selected = kTRUE;
407 Bool_t hasSelectedDaughters = kFALSE;
410 kf = iparticle->GetPdgCode();
411 ks = iparticle->GetStatusCode();
412 if (kf == 92) continue;
414 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
416 hasSelectedDaughters = DaughtersSelection(iparticle);
418 // Put particle on the stack if it is either selected or
419 // it is the mother of at least one seleted particle
421 if (selected || hasSelectedDaughters) {
425 } // particle loop parents
427 // Now select the final state particles
430 for (i = 0; i<np; i++) {
431 TParticle * iparticle = (TParticle *) fParticles->At(i);
432 // Is this a final state particle ?
433 if (!Stable(iparticle)) continue;
435 Bool_t selected = kTRUE;
436 kf = iparticle->GetPdgCode();
437 ks = iparticle->GetStatusCode();
439 // --------------------------------------------------------------------------
440 // Count spectator neutrons and protons
441 if(ks == 0 || ks == 1 || ks == 10 || ks == 11){
442 if(kf == kNeutron) fSpecn += 1;
443 if(kf == kProton) fSpecp += 1;
445 // --------------------------------------------------------------------------
448 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
449 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
453 // Put particle on the stack if selected
459 } // particle loop final state
461 // Write particles to stack
463 for (i = 0; i<np; i++) {
464 TParticle * iparticle = (TParticle *) fParticles->At(i);
465 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
466 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
469 kf = iparticle->GetPdgCode();
470 ks = iparticle->GetStatusCode();
471 p[0] = iparticle->Px();
472 p[1] = iparticle->Py();
473 p[2] = iparticle->Pz();
474 origin[0] = origin0[0]+iparticle->Vx()/10;
475 origin[1] = origin0[1]+iparticle->Vy()/10;
476 origin[2] = origin0[2]+iparticle->Vz()/10;
477 tof = kconv*iparticle->T();
479 TParticle* mother = 0;
481 imo = iparticle->GetFirstMother();
482 mother = (TParticle *) fParticles->At(imo);
483 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
485 Bool_t tFlag = (fTrackIt && !hasDaughter);
486 SetTrack(tFlag,imo,kf,p,origin,polar,
487 tof,kPNoProcess,nt, 1., ks);
495 printf("\n I've put %i particles on the stack \n",nc);
498 if (jev >= fNpart || fNpart == -1) {
499 fKineBias = Float_t(fNpart)/Float_t(fTrials);
500 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
506 SetHighWaterMark(nt);
509 void AliGenHijing::KeepFullEvent()
514 void AliGenHijing::EvaluateCrossSections()
516 // Glauber Calculation of geometrical x-section
518 Float_t xTot = 0.; // barn
519 Float_t xTotHard = 0.; // barn
520 Float_t xPart = 0.; // barn
521 Float_t xPartHard = 0.; // barn
522 Float_t sigmaHard = 0.1; // mbarn
524 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
525 const Float_t kdib = 0.2;
526 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
529 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
530 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
532 Float_t oldvalue= 0.;
534 Float_t* b = new Float_t[kMax];
535 Float_t* si1 = new Float_t[kMax];
536 Float_t* si2 = new Float_t[kMax];
538 for (i = 0; i < kMax; i++)
540 Float_t xb = bMin+i*kdib;
542 ov=fHijing->Profile(xb);
543 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
544 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
547 if (xb > fMinImpactParam && xb < fMaxImpactParam)
553 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
555 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
556 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
564 printf("\n Total cross section (barn): %f \n",xTot);
565 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
566 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
567 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
569 // Store result as a graph
574 fDsigmaDb = new TGraph(i, b, si1);
575 fDnDb = new TGraph(i, b, si2);
578 Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
581 // Looks recursively if one of the daughters has been selected
583 // printf("\n Consider daughters %d:",iparticle->GetPdgCode());
587 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
588 Bool_t selected = kFALSE;
590 imin = iparticle->GetFirstDaughter();
591 imax = iparticle->GetLastDaughter();
592 for (i = imin; i <= imax; i++){
593 TParticle * jparticle = (TParticle *) fParticles->At(i);
594 Int_t ip = jparticle->GetPdgCode();
595 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
596 selected=kTRUE; break;
598 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
607 Bool_t AliGenHijing::SelectFlavor(Int_t pid)
609 // Select flavor of particle
611 // 4: charm and beauty
618 Int_t ifl = TMath::Abs(pid/100);
619 if (ifl > 10) ifl/=10;
620 res = (fFlavor == ifl);
623 // This part if gamma writing is inhibited
625 res = res && (pid != kGamma && pid != kPi0);
630 Bool_t AliGenHijing::Stable(TParticle* particle)
632 // Return true for a stable particle
635 if (particle->GetFirstDaughter() < 0 )
644 void AliGenHijing::Boost()
647 // Boost cms into LHC lab frame
649 Double_t dy = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) /
650 (Double_t(fZTarget) * Double_t(fAProjectile)));
651 Double_t beta = TMath::TanH(dy);
652 Double_t gamma = 1./TMath::Sqrt(1.-beta*beta);
653 Double_t gb = gamma * beta;
655 printf("\n Boosting particles to lab frame %f %f %f", dy, beta, gamma);
658 Int_t np = fParticles->GetEntriesFast();
659 for (i = 0; i < np; i++)
661 TParticle* iparticle = (TParticle*) fParticles->At(i);
663 Double_t e = iparticle->Energy();
664 Double_t px = iparticle->Px();
665 Double_t py = iparticle->Py();
666 Double_t pz = iparticle->Pz();
668 Double_t eb = gamma * e - gb * pz;
669 Double_t pzb = -gb * e + gamma * pz;
671 iparticle->SetMomentum(px, py, pzb, eb);
676 void AliGenHijing::MakeHeader()
678 // Builds the event header, to be called after each event
679 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
680 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
681 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
682 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
683 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
684 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
685 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
689 ((AliGenHijingEventHeader*) header)->SetSpectators(fSpecn, fSpecp);
691 // 4-momentum vectors of the triggered jets.
693 // Before final state gluon radiation.
694 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
695 fHijing->GetHINT1(22),
696 fHijing->GetHINT1(23),
697 fHijing->GetHINT1(24));
699 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
700 fHijing->GetHINT1(32),
701 fHijing->GetHINT1(33),
702 fHijing->GetHINT1(34));
703 // After final state gluon radiation.
704 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
705 fHijing->GetHINT1(27),
706 fHijing->GetHINT1(28),
707 fHijing->GetHINT1(29));
709 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
710 fHijing->GetHINT1(37),
711 fHijing->GetHINT1(38),
712 fHijing->GetHINT1(39));
713 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
714 // Bookkeeping for kinematic bias
715 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
717 header->SetPrimaryVertex(fEventVertex);
718 gAlice->SetGenEventHeader(header);
719 fCollisionGeometry = (AliGenHijingEventHeader*) header;
722 Bool_t AliGenHijing::CheckTrigger()
724 // Check the kinematic trigger condition
726 Bool_t triggered = kFALSE;
732 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
733 fHijing->GetHINT1(27),
734 fHijing->GetHINT1(28),
735 fHijing->GetHINT1(29));
737 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
738 fHijing->GetHINT1(37),
739 fHijing->GetHINT1(38),
740 fHijing->GetHINT1(39));
741 Double_t eta1 = jet1->Eta();
742 Double_t eta2 = jet2->Eta();
743 Double_t phi1 = jet1->Phi();
744 Double_t phi2 = jet2->Phi();
745 // printf("\n Trigger: %f %f %f %f",
746 // fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
748 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
749 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
751 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
752 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
755 } else if (fTrigger == 2) {
758 Int_t np = fParticles->GetEntriesFast();
759 for (Int_t i = 0; i < np; i++) {
760 TParticle* part = (TParticle*) fParticles->At(i);
761 Int_t kf = part->GetPdgCode();
762 Int_t ks = part->GetStatusCode();
763 if (kf == 22 && ks == 40) {
764 Float_t phi = part->Phi();
765 Float_t eta = part->Eta();
766 if (eta < fEtaMaxJet &&
772 } // check phi,eta within limits
782 AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
784 // Assignment operator
789 # define rluget_hijing rluget_hijing_
790 # define rluset_hijing rluset_hijing_
791 # define rlu_hijing rlu_hijing_
792 # define type_of_call
794 # define rluget_hijing RLUGET_HIJING
795 # define rluset_hijing RLUSET_HIJING
796 # define rlu_hijing RLU_HIJING
797 # define type_of_call _stdcall
802 void type_of_call rluget_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
803 {printf("Dummy version of rluget_hijing reached\n");}
805 void type_of_call rluset_hijing(Int_t & /*lfn*/, Int_t & /*move*/)
806 {printf("Dummy version of rluset_hijing reached\n");}
808 Double_t type_of_call rlu_hijing(Int_t & /*idum*/)
811 do r=sRandom->Rndm(); while(0 >= r || r >= 1);