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36b81802 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
7cdba479 16/* $Id$ */
36b81802 17
18// Generator using HIJING as an external generator
19// The main HIJING options are accessable for the user through this interface.
20// Uses the THijing implementation of TGenerator.
14cae7e9 21// Author:
22// Andreas Morsch (andreas.morsch@cern.ch)
36b81802 23//
36b81802 24
36b81802 25#include <TGraph.h>
26#include <THijing.h>
27#include <TLorentzVector.h>
28#include <TPDGCode.h>
29#include <TParticle.h>
30
31#include "AliGenHijing.h"
32#include "AliGenHijingEventHeader.h"
33#include "AliRun.h"
7cdba479 34#include "AliHijingRndm.h"
36b81802 35
7cdba479 36ClassImp(AliGenHijing)
36b81802 37
38AliGenHijing::AliGenHijing()
39 :AliGenMC()
40{
41// Constructor
42 fParticles = 0;
43 fHijing = 0;
44 fDsigmaDb = 0;
45 fDnDb = 0;
7cdba479 46 AliHijingRndm::SetHijingRandom(GetRandom());
36b81802 47}
48
49AliGenHijing::AliGenHijing(Int_t npart)
50 :AliGenMC(npart)
51{
52// Default PbPb collisions at 5. 5 TeV
53//
54 fName = "Hijing";
55 fTitle= "Particle Generator using HIJING";
56
57 SetEnergyCMS();
58 SetImpactParameterRange();
36b81802 59 SetBoostLHC();
60 SetJetEtaRange();
61 SetJetPhiRange();
62
63 fKeep = 0;
64 fQuench = 1;
65 fShadowing = 1;
66 fTrigger = 0;
67 fDecaysOff = 1;
68 fEvaluate = 0;
69 fSelectAll = 0;
70 fFlavor = 0;
71 fSpectators = 1;
72 fDsigmaDb = 0;
73 fDnDb = 0;
74 fPtMinJet = -2.5;
75 fRadiation = 3;
0c0c6204 76 //
36b81802 77 SetSimpleJets();
78 SetNoGammas();
f82795ff 79 SetRandomPz();
80 SwitchOffHeavyQuarks(kFALSE);
36b81802 81//
82 fParticles = new TClonesArray("TParticle",10000);
83//
84// Set random number generator
7cdba479 85 AliHijingRndm::SetHijingRandom(GetRandom());
36b81802 86 fHijing = 0;
87
88}
89
9c63d20a 90AliGenHijing::AliGenHijing(const AliGenHijing & hijing):
91 AliGenMC(hijing)
36b81802 92{
93// copy constructor
94}
95
96
97AliGenHijing::~AliGenHijing()
98{
99// Destructor
100 if ( fDsigmaDb) delete fDsigmaDb;
101 if ( fDnDb) delete fDnDb;
102 delete fParticles;
103}
104
105void AliGenHijing::Init()
106{
107// Initialisation
108 fFrame.Resize(8);
109 fTarget.Resize(8);
110 fProjectile.Resize(8);
111
112 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
113 fAProjectile, fZProjectile, fATarget, fZTarget,
114 fMinImpactParam, fMaxImpactParam));
115
b88f5cea 116 fHijing=(THijing*) fMCEvGen;
36b81802 117 fHijing->SetIHPR2(2, fRadiation);
118 fHijing->SetIHPR2(3, fTrigger);
119 fHijing->SetIHPR2(6, fShadowing);
120 fHijing->SetIHPR2(12, fDecaysOff);
121 fHijing->SetIHPR2(21, fKeep);
122 fHijing->SetHIPR1(10, fPtMinJet);
123 fHijing->SetHIPR1(50, fSimpleJet);
124//
125// Quenching
126//
127//
128// fQuench = 0: no quenching
129// fQuench = 1: hijing default
130// fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
131// fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
132// fQuench = 4: new LHC parameters with log(e) dependence
133// fQuench = 5: new RHIC parameters with log(e) dependence
134 fHijing->SetIHPR2(50, 0);
135 if (fQuench > 0)
136 fHijing->SetIHPR2(4, 1);
137 else
138 fHijing->SetIHPR2(4, 0);
139// New LHC parameters from Xin-Nian Wang
140 if (fQuench == 2) {
141 fHijing->SetHIPR1(14, 1.1);
142 fHijing->SetHIPR1(11, 3.7);
143 } else if (fQuench == 3) {
144 fHijing->SetHIPR1(14, 0.20);
145 fHijing->SetHIPR1(11, 2.5);
146 } else if (fQuench == 4) {
147 fHijing->SetIHPR2(50, 1);
148 fHijing->SetHIPR1(14, 4.*0.34);
149 fHijing->SetHIPR1(11, 3.7);
150 } else if (fQuench == 5) {
151 fHijing->SetIHPR2(50, 1);
152 fHijing->SetHIPR1(14, 0.34);
153 fHijing->SetHIPR1(11, 2.5);
154 }
155
f82795ff 156//
157// Heavy quarks
158//
159 if (fNoHeavyQuarks) {
160 fHijing->SetIHPR2(49, 1);
161 } else {
162 fHijing->SetIHPR2(49, 0);
163 }
164
36b81802 165
cc463e4a 166 AliGenMC::Init();
36b81802 167
168//
169// Initialize Hijing
170//
171 fHijing->Initialize();
172//
173 if (fEvaluate) EvaluateCrossSections();
174//
175}
176
177void AliGenHijing::Generate()
178{
179// Generate one event
180
181 Float_t polar[3] = {0,0,0};
182 Float_t origin[3] = {0,0,0};
183 Float_t origin0[3] = {0,0,0};
0c0c6204 184 Float_t p[3];
36b81802 185 Float_t tof;
186
187// converts from mm/c to s
188 const Float_t kconv = 0.001/2.999792458e8;
189//
190 Int_t nt = 0;
191 Int_t jev = 0;
2d677e30 192 Int_t j, kf, ks, ksp, imo;
36b81802 193 kf = 0;
194
195
196
197 fTrials = 0;
198 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
199 if(fVertexSmear == kPerEvent) {
0c0c6204 200 Vertex();
201 for (j=0; j < 3; j++) origin0[j] = fVertex[j];
202 }
203
b25b821e 204
205 Float_t sign = (fRandomPz && (Rndm() < 0.5))? -1. : 1.;
36b81802 206 while(1)
207 {
208// Generate one event
209// --------------------------------------------------------------------------
f0c86dd6 210 fProjectileSpecn = 0;
211 fProjectileSpecp = 0;
b25b821e 212 fTargetSpecn = 0;
213 fTargetSpecp = 0;
36b81802 214// --------------------------------------------------------------------------
215 fHijing->GenerateEvent();
216 fTrials++;
217 fHijing->ImportParticles(fParticles,"All");
218 if (fTrigger != kNoTrigger) {
219 if (!CheckTrigger()) continue;
220 }
71ea527c 221 if (fLHC) Boost();
36b81802 222
223
224 Int_t np = fParticles->GetEntriesFast();
225 printf("\n **************************************************%d\n",np);
226 Int_t nc = 0;
227 if (np == 0 ) continue;
228 Int_t i;
229 Int_t* newPos = new Int_t[np];
230 Int_t* pSelected = new Int_t[np];
231
232 for (i = 0; i < np; i++) {
233 newPos[i] = i;
234 pSelected[i] = 0;
235 }
236
237// Get event vertex
238//
239 TParticle * iparticle = (TParticle *) fParticles->At(0);
0c0c6204 240 fVertex[0] = origin0[0];
241 fVertex[1] = origin0[1];
242 fVertex[2] = origin0[2];
36b81802 243
244//
245// First select parent particles
246//
247
248 for (i = 0; i < np; i++) {
249 iparticle = (TParticle *) fParticles->At(i);
250
251// Is this a parent particle ?
252 if (Stable(iparticle)) continue;
253//
254 Bool_t selected = kTRUE;
255 Bool_t hasSelectedDaughters = kFALSE;
256
257
258 kf = iparticle->GetPdgCode();
259 ks = iparticle->GetStatusCode();
260 if (kf == 92) continue;
261
262 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
263 SelectFlavor(kf);
264 hasSelectedDaughters = DaughtersSelection(iparticle);
265//
266// Put particle on the stack if it is either selected or
267// it is the mother of at least one seleted particle
268//
269 if (selected || hasSelectedDaughters) {
270 nc++;
271 pSelected[i] = 1;
272 } // selected
273 } // particle loop parents
274//
275// Now select the final state particles
276//
277
278 for (i = 0; i<np; i++) {
279 TParticle * iparticle = (TParticle *) fParticles->At(i);
280// Is this a final state particle ?
281 if (!Stable(iparticle)) continue;
282
283 Bool_t selected = kTRUE;
284 kf = iparticle->GetPdgCode();
285 ks = iparticle->GetStatusCode();
2d677e30 286 ksp = iparticle->GetUniqueID();
36b81802 287
288// --------------------------------------------------------------------------
289// Count spectator neutrons and protons
2d677e30 290 if(ksp == 0 || ksp == 1){
f0c86dd6 291 if(kf == kNeutron) fProjectileSpecn += 1;
292 if(kf == kProton) fProjectileSpecp += 1;
293 }
2d677e30 294 else if(ksp == 10 || ksp == 11){
f0c86dd6 295 if(kf == kNeutron) fTargetSpecn += 1;
296 if(kf == kProton) fTargetSpecp += 1;
36b81802 297 }
298// --------------------------------------------------------------------------
299//
300 if (!fSelectAll) {
301 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
2d677e30 302 if (!fSpectators && selected) selected = (ksp != 0 && ksp != 1 && ksp != 10
303 && ksp != 11);
36b81802 304 }
305//
306// Put particle on the stack if selected
307//
308 if (selected) {
309 nc++;
310 pSelected[i] = 1;
311 } // selected
312 } // particle loop final state
3439da17 313
36b81802 314//
3439da17 315// Time of the interactions
316 Float_t tInt = 0.;
317 if (fPileUpTimeWindow > 0.) tInt = fPileUpTimeWindow * (2. * gRandom->Rndm() - 1.);
318
36b81802 319//
3439da17 320// Write particles to stack
321
36b81802 322 for (i = 0; i<np; i++) {
323 TParticle * iparticle = (TParticle *) fParticles->At(i);
324 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
325 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
36b81802 326 if (pSelected[i]) {
327 kf = iparticle->GetPdgCode();
328 ks = iparticle->GetStatusCode();
329 p[0] = iparticle->Px();
330 p[1] = iparticle->Py();
b25b821e 331 p[2] = iparticle->Pz() * sign;
36b81802 332 origin[0] = origin0[0]+iparticle->Vx()/10;
333 origin[1] = origin0[1]+iparticle->Vy()/10;
334 origin[2] = origin0[2]+iparticle->Vz()/10;
3439da17 335 tof = kconv * iparticle->T() + sign * origin0[2] / 3.e10;
336 if (fPileUpTimeWindow > 0.) tof += tInt;
337
36b81802 338 imo = -1;
339 TParticle* mother = 0;
340 if (hasMother) {
341 imo = iparticle->GetFirstMother();
342 mother = (TParticle *) fParticles->At(imo);
e57522c0 343 imo = (mother->GetPdgCode() != 92) ? newPos[imo] : -1;
36b81802 344 } // if has mother
345 Bool_t tFlag = (fTrackIt && !hasDaughter);
3439da17 346 PushTrack(tFlag,imo,kf,p,origin,polar,tof,kPNoProcess,nt, 1., ks);
cf57b268 347
348
36b81802 349 KeepTrack(nt);
350 newPos[i] = nt;
351 } // if selected
352 } // particle loop
353 delete[] newPos;
354 delete[] pSelected;
355
356 printf("\n I've put %i particles on the stack \n",nc);
357 if (nc > 0) {
358 jev += nc;
359 if (jev >= fNpart || fNpart == -1) {
360 fKineBias = Float_t(fNpart)/Float_t(fTrials);
361 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
362 break;
363 }
364 }
365 } // event loop
366 MakeHeader();
367 SetHighWaterMark(nt);
368}
369
370void AliGenHijing::KeepFullEvent()
371{
372 fKeep=1;
373}
374
375void AliGenHijing::EvaluateCrossSections()
376{
377// Glauber Calculation of geometrical x-section
378//
379 Float_t xTot = 0.; // barn
380 Float_t xTotHard = 0.; // barn
381 Float_t xPart = 0.; // barn
382 Float_t xPartHard = 0.; // barn
383 Float_t sigmaHard = 0.1; // mbarn
384 Float_t bMin = 0.;
385 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
386 const Float_t kdib = 0.2;
387 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
388
389
390 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
391 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
392 Int_t i;
393 Float_t oldvalue= 0.;
394
395 Float_t* b = new Float_t[kMax];
396 Float_t* si1 = new Float_t[kMax];
397 Float_t* si2 = new Float_t[kMax];
398
399 for (i = 0; i < kMax; i++)
400 {
401 Float_t xb = bMin+i*kdib;
402 Float_t ov;
403 ov=fHijing->Profile(xb);
404 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
405 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
406 xTot+=gb;
407 xTotHard += gbh;
408 printf("profile %f %f %f\n", xb, ov, fHijing->GetHINT1(12));
409
410 if (xb > fMinImpactParam && xb < fMaxImpactParam)
411 {
412 xPart += gb;
413 xPartHard += gbh;
414 }
415
416 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
417 oldvalue = xTot;
418 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
419 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
420 if (i>0) {
421 si1[i] = gb/kdib;
422 si2[i] = gbh/gb;
423 b[i] = xb;
424 }
425 }
426
427 printf("\n Total cross section (barn): %f \n",xTot);
428 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
429 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
430 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
431
432// Store result as a graph
433 b[0] = 0;
434 si1[0] = 0;
435 si2[0]=si2[1];
436
437 fDsigmaDb = new TGraph(i, b, si1);
438 fDnDb = new TGraph(i, b, si2);
439}
440
441Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
442{
443//
444// Looks recursively if one of the daughters has been selected
445//
446// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
447 Int_t imin = -1;
448 Int_t imax = -1;
449 Int_t i;
450 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
451 Bool_t selected = kFALSE;
452 if (hasDaughters) {
453 imin = iparticle->GetFirstDaughter();
454 imax = iparticle->GetLastDaughter();
455 for (i = imin; i <= imax; i++){
456 TParticle * jparticle = (TParticle *) fParticles->At(i);
457 Int_t ip = jparticle->GetPdgCode();
458 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
459 selected=kTRUE; break;
460 }
461 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
462 }
463 } else {
464 return kFALSE;
465 }
466 return selected;
467}
468
469
470Bool_t AliGenHijing::SelectFlavor(Int_t pid)
471{
472// Select flavor of particle
473// 0: all
474// 4: charm and beauty
475// 5: beauty
476 Bool_t res = 0;
477
478 if (fFlavor == 0) {
479 res = kTRUE;
480 } else {
481 Int_t ifl = TMath::Abs(pid/100);
482 if (ifl > 10) ifl/=10;
483 res = (fFlavor == ifl);
484 }
485//
486// This part if gamma writing is inhibited
487 if (fNoGammas)
488 res = res && (pid != kGamma && pid != kPi0);
489//
490 return res;
491}
492
14cae7e9 493Bool_t AliGenHijing::Stable(TParticle* particle) const
36b81802 494{
495// Return true for a stable particle
496//
497
498 if (particle->GetFirstDaughter() < 0 )
499 {
500 return kTRUE;
501 } else {
502 return kFALSE;
503 }
504}
505
506
36b81802 507
508void AliGenHijing::MakeHeader()
509{
510// Builds the event header, to be called after each event
511 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
512 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
513 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
514 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
515 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
516 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
517 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
518 fHijing->GetN01(),
519 fHijing->GetN10(),
520 fHijing->GetN11());
f0c86dd6 521 ((AliGenHijingEventHeader*) header)->SetSpectators(fProjectileSpecn, fProjectileSpecp,
522 fTargetSpecn,fTargetSpecp);
3c0c211c 523 ((AliGenHijingEventHeader*) header)->SetReactionPlaneAngle(fHijing->GetHINT1(20));
524
525
36b81802 526
527// 4-momentum vectors of the triggered jets.
528//
529// Before final state gluon radiation.
530 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
531 fHijing->GetHINT1(22),
532 fHijing->GetHINT1(23),
533 fHijing->GetHINT1(24));
534
535 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
536 fHijing->GetHINT1(32),
537 fHijing->GetHINT1(33),
538 fHijing->GetHINT1(34));
539// After final state gluon radiation.
540 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
541 fHijing->GetHINT1(27),
542 fHijing->GetHINT1(28),
543 fHijing->GetHINT1(29));
544
545 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
546 fHijing->GetHINT1(37),
547 fHijing->GetHINT1(38),
548 fHijing->GetHINT1(39));
549 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
550// Bookkeeping for kinematic bias
551 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
552// Event Vertex
0c0c6204 553 header->SetPrimaryVertex(fVertex);
cf57b268 554 AddHeader(header);
36b81802 555 fCollisionGeometry = (AliGenHijingEventHeader*) header;
556}
557
cf57b268 558void AliGenHijing::AddHeader(AliGenEventHeader* header)
559{
560 // Passes header either to the container or to gAlice
561 if (fContainer) {
562 fContainer->AddHeader(header);
563 } else {
564 gAlice->SetGenEventHeader(header);
565 }
566}
567
568
36b81802 569Bool_t AliGenHijing::CheckTrigger()
570{
571// Check the kinematic trigger condition
572//
573 Bool_t triggered = kFALSE;
574
575 if (fTrigger == 1) {
576//
577// jet-jet Trigger
578
579 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
580 fHijing->GetHINT1(27),
581 fHijing->GetHINT1(28),
582 fHijing->GetHINT1(29));
583
584 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
585 fHijing->GetHINT1(37),
586 fHijing->GetHINT1(38),
587 fHijing->GetHINT1(39));
588 Double_t eta1 = jet1->Eta();
589 Double_t eta2 = jet2->Eta();
590 Double_t phi1 = jet1->Phi();
591 Double_t phi2 = jet2->Phi();
592// printf("\n Trigger: %f %f %f %f",
593// fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
594 if (
595 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
596 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
597 ||
598 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
599 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
600 )
601 triggered = kTRUE;
602 } else if (fTrigger == 2) {
603// Gamma Jet
604//
605 Int_t np = fParticles->GetEntriesFast();
606 for (Int_t i = 0; i < np; i++) {
607 TParticle* part = (TParticle*) fParticles->At(i);
608 Int_t kf = part->GetPdgCode();
2d677e30 609 Int_t ksp = part->GetUniqueID();
610 if (kf == 22 && ksp == 40) {
36b81802 611 Float_t phi = part->Phi();
612 Float_t eta = part->Eta();
613 if (eta < fEtaMaxJet &&
614 eta > fEtaMinJet &&
615 phi < fPhiMaxJet &&
616 phi > fPhiMinJet) {
617 triggered = 1;
618 break;
619 } // check phi,eta within limits
620 } // direct gamma ?
621 } // particle loop
622 } // fTrigger == 2
623 return triggered;
624}
625
626
39192f05 627void AliGenHijing::Copy(TObject &) const
9c63d20a 628{
629 Fatal("Copy","Not implemented!\n");
630}
36b81802 631
632AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
633{
9c63d20a 634 rhs.Copy(*this);
635 return (*this);
36b81802 636}
637