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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;
192 Int_t j, kf, ks, imo;
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();
286
287// --------------------------------------------------------------------------
288// Count spectator neutrons and protons
f0c86dd6 289 if(ks == 0 || ks == 1){
290 if(kf == kNeutron) fProjectileSpecn += 1;
291 if(kf == kProton) fProjectileSpecp += 1;
292 }
293 else if(ks == 10 || ks == 11){
294 if(kf == kNeutron) fTargetSpecn += 1;
295 if(kf == kProton) fTargetSpecp += 1;
36b81802 296 }
297// --------------------------------------------------------------------------
298//
299 if (!fSelectAll) {
300 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
301 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
302 && ks != 11);
303 }
304//
305// Put particle on the stack if selected
306//
307 if (selected) {
308 nc++;
309 pSelected[i] = 1;
310 } // selected
311 } // particle loop final state
312//
313// Write particles to stack
314//
315 for (i = 0; i<np; i++) {
316 TParticle * iparticle = (TParticle *) fParticles->At(i);
317 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
318 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
36b81802 319 if (pSelected[i]) {
320 kf = iparticle->GetPdgCode();
321 ks = iparticle->GetStatusCode();
322 p[0] = iparticle->Px();
323 p[1] = iparticle->Py();
b25b821e 324 p[2] = iparticle->Pz() * sign;
36b81802 325 origin[0] = origin0[0]+iparticle->Vx()/10;
326 origin[1] = origin0[1]+iparticle->Vy()/10;
327 origin[2] = origin0[2]+iparticle->Vz()/10;
328 tof = kconv*iparticle->T();
329 imo = -1;
330 TParticle* mother = 0;
331 if (hasMother) {
332 imo = iparticle->GetFirstMother();
333 mother = (TParticle *) fParticles->At(imo);
e57522c0 334 imo = (mother->GetPdgCode() != 92) ? newPos[imo] : -1;
36b81802 335 } // if has mother
336 Bool_t tFlag = (fTrackIt && !hasDaughter);
642f15cf 337 PushTrack(tFlag,imo,kf,p,origin,polar,
36b81802 338 tof,kPNoProcess,nt, 1., ks);
cf57b268 339
340
36b81802 341 KeepTrack(nt);
342 newPos[i] = nt;
343 } // if selected
344 } // particle loop
345 delete[] newPos;
346 delete[] pSelected;
347
348 printf("\n I've put %i particles on the stack \n",nc);
349 if (nc > 0) {
350 jev += nc;
351 if (jev >= fNpart || fNpart == -1) {
352 fKineBias = Float_t(fNpart)/Float_t(fTrials);
353 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
354 break;
355 }
356 }
357 } // event loop
358 MakeHeader();
359 SetHighWaterMark(nt);
360}
361
362void AliGenHijing::KeepFullEvent()
363{
364 fKeep=1;
365}
366
367void AliGenHijing::EvaluateCrossSections()
368{
369// Glauber Calculation of geometrical x-section
370//
371 Float_t xTot = 0.; // barn
372 Float_t xTotHard = 0.; // barn
373 Float_t xPart = 0.; // barn
374 Float_t xPartHard = 0.; // barn
375 Float_t sigmaHard = 0.1; // mbarn
376 Float_t bMin = 0.;
377 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
378 const Float_t kdib = 0.2;
379 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
380
381
382 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
383 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
384 Int_t i;
385 Float_t oldvalue= 0.;
386
387 Float_t* b = new Float_t[kMax];
388 Float_t* si1 = new Float_t[kMax];
389 Float_t* si2 = new Float_t[kMax];
390
391 for (i = 0; i < kMax; i++)
392 {
393 Float_t xb = bMin+i*kdib;
394 Float_t ov;
395 ov=fHijing->Profile(xb);
396 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
397 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
398 xTot+=gb;
399 xTotHard += gbh;
400 printf("profile %f %f %f\n", xb, ov, fHijing->GetHINT1(12));
401
402 if (xb > fMinImpactParam && xb < fMaxImpactParam)
403 {
404 xPart += gb;
405 xPartHard += gbh;
406 }
407
408 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
409 oldvalue = xTot;
410 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
411 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
412 if (i>0) {
413 si1[i] = gb/kdib;
414 si2[i] = gbh/gb;
415 b[i] = xb;
416 }
417 }
418
419 printf("\n Total cross section (barn): %f \n",xTot);
420 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
421 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
422 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
423
424// Store result as a graph
425 b[0] = 0;
426 si1[0] = 0;
427 si2[0]=si2[1];
428
429 fDsigmaDb = new TGraph(i, b, si1);
430 fDnDb = new TGraph(i, b, si2);
431}
432
433Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
434{
435//
436// Looks recursively if one of the daughters has been selected
437//
438// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
439 Int_t imin = -1;
440 Int_t imax = -1;
441 Int_t i;
442 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
443 Bool_t selected = kFALSE;
444 if (hasDaughters) {
445 imin = iparticle->GetFirstDaughter();
446 imax = iparticle->GetLastDaughter();
447 for (i = imin; i <= imax; i++){
448 TParticle * jparticle = (TParticle *) fParticles->At(i);
449 Int_t ip = jparticle->GetPdgCode();
450 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
451 selected=kTRUE; break;
452 }
453 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
454 }
455 } else {
456 return kFALSE;
457 }
458 return selected;
459}
460
461
462Bool_t AliGenHijing::SelectFlavor(Int_t pid)
463{
464// Select flavor of particle
465// 0: all
466// 4: charm and beauty
467// 5: beauty
468 Bool_t res = 0;
469
470 if (fFlavor == 0) {
471 res = kTRUE;
472 } else {
473 Int_t ifl = TMath::Abs(pid/100);
474 if (ifl > 10) ifl/=10;
475 res = (fFlavor == ifl);
476 }
477//
478// This part if gamma writing is inhibited
479 if (fNoGammas)
480 res = res && (pid != kGamma && pid != kPi0);
481//
482 return res;
483}
484
14cae7e9 485Bool_t AliGenHijing::Stable(TParticle* particle) const
36b81802 486{
487// Return true for a stable particle
488//
489
490 if (particle->GetFirstDaughter() < 0 )
491 {
492 return kTRUE;
493 } else {
494 return kFALSE;
495 }
496}
497
498
36b81802 499
500void AliGenHijing::MakeHeader()
501{
502// Builds the event header, to be called after each event
503 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
504 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
505 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
506 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
507 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
508 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
509 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
510 fHijing->GetN01(),
511 fHijing->GetN10(),
512 fHijing->GetN11());
f0c86dd6 513 ((AliGenHijingEventHeader*) header)->SetSpectators(fProjectileSpecn, fProjectileSpecp,
514 fTargetSpecn,fTargetSpecp);
3c0c211c 515 ((AliGenHijingEventHeader*) header)->SetReactionPlaneAngle(fHijing->GetHINT1(20));
516
517
36b81802 518
519// 4-momentum vectors of the triggered jets.
520//
521// Before final state gluon radiation.
522 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
523 fHijing->GetHINT1(22),
524 fHijing->GetHINT1(23),
525 fHijing->GetHINT1(24));
526
527 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
528 fHijing->GetHINT1(32),
529 fHijing->GetHINT1(33),
530 fHijing->GetHINT1(34));
531// After final state gluon radiation.
532 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
533 fHijing->GetHINT1(27),
534 fHijing->GetHINT1(28),
535 fHijing->GetHINT1(29));
536
537 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
538 fHijing->GetHINT1(37),
539 fHijing->GetHINT1(38),
540 fHijing->GetHINT1(39));
541 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
542// Bookkeeping for kinematic bias
543 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
544// Event Vertex
0c0c6204 545 header->SetPrimaryVertex(fVertex);
cf57b268 546 AddHeader(header);
36b81802 547 fCollisionGeometry = (AliGenHijingEventHeader*) header;
548}
549
cf57b268 550void AliGenHijing::AddHeader(AliGenEventHeader* header)
551{
552 // Passes header either to the container or to gAlice
553 if (fContainer) {
554 fContainer->AddHeader(header);
555 } else {
556 gAlice->SetGenEventHeader(header);
557 }
558}
559
560
36b81802 561Bool_t AliGenHijing::CheckTrigger()
562{
563// Check the kinematic trigger condition
564//
565 Bool_t triggered = kFALSE;
566
567 if (fTrigger == 1) {
568//
569// jet-jet Trigger
570
571 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
572 fHijing->GetHINT1(27),
573 fHijing->GetHINT1(28),
574 fHijing->GetHINT1(29));
575
576 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
577 fHijing->GetHINT1(37),
578 fHijing->GetHINT1(38),
579 fHijing->GetHINT1(39));
580 Double_t eta1 = jet1->Eta();
581 Double_t eta2 = jet2->Eta();
582 Double_t phi1 = jet1->Phi();
583 Double_t phi2 = jet2->Phi();
584// printf("\n Trigger: %f %f %f %f",
585// fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
586 if (
587 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
588 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
589 ||
590 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
591 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
592 )
593 triggered = kTRUE;
594 } else if (fTrigger == 2) {
595// Gamma Jet
596//
597 Int_t np = fParticles->GetEntriesFast();
598 for (Int_t i = 0; i < np; i++) {
599 TParticle* part = (TParticle*) fParticles->At(i);
600 Int_t kf = part->GetPdgCode();
601 Int_t ks = part->GetStatusCode();
602 if (kf == 22 && ks == 40) {
603 Float_t phi = part->Phi();
604 Float_t eta = part->Eta();
605 if (eta < fEtaMaxJet &&
606 eta > fEtaMinJet &&
607 phi < fPhiMaxJet &&
608 phi > fPhiMinJet) {
609 triggered = 1;
610 break;
611 } // check phi,eta within limits
612 } // direct gamma ?
613 } // particle loop
614 } // fTrigger == 2
615 return triggered;
616}
617
618
39192f05 619void AliGenHijing::Copy(TObject &) const
9c63d20a 620{
621 Fatal("Copy","Not implemented!\n");
622}
36b81802 623
624AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
625{
9c63d20a 626 rhs.Copy(*this);
627 return (*this);
36b81802 628}
629