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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();
79//
80 fParticles = new TClonesArray("TParticle",10000);
81//
82// Set random number generator
7cdba479 83 AliHijingRndm::SetHijingRandom(GetRandom());
36b81802 84 fHijing = 0;
85
86}
87
9c63d20a 88AliGenHijing::AliGenHijing(const AliGenHijing & hijing):
89 AliGenMC(hijing)
36b81802 90{
91// copy constructor
92}
93
94
95AliGenHijing::~AliGenHijing()
96{
97// Destructor
98 if ( fDsigmaDb) delete fDsigmaDb;
99 if ( fDnDb) delete fDnDb;
100 delete fParticles;
101}
102
103void AliGenHijing::Init()
104{
105// Initialisation
106 fFrame.Resize(8);
107 fTarget.Resize(8);
108 fProjectile.Resize(8);
109
110 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
111 fAProjectile, fZProjectile, fATarget, fZTarget,
112 fMinImpactParam, fMaxImpactParam));
113
b88f5cea 114 fHijing=(THijing*) fMCEvGen;
36b81802 115 fHijing->SetIHPR2(2, fRadiation);
116 fHijing->SetIHPR2(3, fTrigger);
117 fHijing->SetIHPR2(6, fShadowing);
118 fHijing->SetIHPR2(12, fDecaysOff);
119 fHijing->SetIHPR2(21, fKeep);
120 fHijing->SetHIPR1(10, fPtMinJet);
121 fHijing->SetHIPR1(50, fSimpleJet);
122//
123// Quenching
124//
125//
126// fQuench = 0: no quenching
127// fQuench = 1: hijing default
128// fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
129// fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
130// fQuench = 4: new LHC parameters with log(e) dependence
131// fQuench = 5: new RHIC parameters with log(e) dependence
132 fHijing->SetIHPR2(50, 0);
133 if (fQuench > 0)
134 fHijing->SetIHPR2(4, 1);
135 else
136 fHijing->SetIHPR2(4, 0);
137// New LHC parameters from Xin-Nian Wang
138 if (fQuench == 2) {
139 fHijing->SetHIPR1(14, 1.1);
140 fHijing->SetHIPR1(11, 3.7);
141 } else if (fQuench == 3) {
142 fHijing->SetHIPR1(14, 0.20);
143 fHijing->SetHIPR1(11, 2.5);
144 } else if (fQuench == 4) {
145 fHijing->SetIHPR2(50, 1);
146 fHijing->SetHIPR1(14, 4.*0.34);
147 fHijing->SetHIPR1(11, 3.7);
148 } else if (fQuench == 5) {
149 fHijing->SetIHPR2(50, 1);
150 fHijing->SetHIPR1(14, 0.34);
151 fHijing->SetHIPR1(11, 2.5);
152 }
153
154
cc463e4a 155 AliGenMC::Init();
36b81802 156
157//
158// Initialize Hijing
159//
160 fHijing->Initialize();
161//
162 if (fEvaluate) EvaluateCrossSections();
163//
164}
165
166void AliGenHijing::Generate()
167{
168// Generate one event
169
170 Float_t polar[3] = {0,0,0};
171 Float_t origin[3] = {0,0,0};
172 Float_t origin0[3] = {0,0,0};
0c0c6204 173 Float_t p[3];
36b81802 174 Float_t tof;
175
176// converts from mm/c to s
177 const Float_t kconv = 0.001/2.999792458e8;
178//
179 Int_t nt = 0;
180 Int_t jev = 0;
181 Int_t j, kf, ks, imo;
182 kf = 0;
183
184
185
186 fTrials = 0;
187 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
188 if(fVertexSmear == kPerEvent) {
0c0c6204 189 Vertex();
190 for (j=0; j < 3; j++) origin0[j] = fVertex[j];
191 }
192
b25b821e 193
194 Float_t sign = (fRandomPz && (Rndm() < 0.5))? -1. : 1.;
36b81802 195 while(1)
196 {
197// Generate one event
198// --------------------------------------------------------------------------
f0c86dd6 199 fProjectileSpecn = 0;
200 fProjectileSpecp = 0;
b25b821e 201 fTargetSpecn = 0;
202 fTargetSpecp = 0;
36b81802 203// --------------------------------------------------------------------------
204 fHijing->GenerateEvent();
205 fTrials++;
206 fHijing->ImportParticles(fParticles,"All");
207 if (fTrigger != kNoTrigger) {
208 if (!CheckTrigger()) continue;
209 }
71ea527c 210 if (fLHC) Boost();
36b81802 211
212
213 Int_t np = fParticles->GetEntriesFast();
214 printf("\n **************************************************%d\n",np);
215 Int_t nc = 0;
216 if (np == 0 ) continue;
217 Int_t i;
218 Int_t* newPos = new Int_t[np];
219 Int_t* pSelected = new Int_t[np];
220
221 for (i = 0; i < np; i++) {
222 newPos[i] = i;
223 pSelected[i] = 0;
224 }
225
226// Get event vertex
227//
228 TParticle * iparticle = (TParticle *) fParticles->At(0);
0c0c6204 229 fVertex[0] = origin0[0];
230 fVertex[1] = origin0[1];
231 fVertex[2] = origin0[2];
36b81802 232
233//
234// First select parent particles
235//
236
237 for (i = 0; i < np; i++) {
238 iparticle = (TParticle *) fParticles->At(i);
239
240// Is this a parent particle ?
241 if (Stable(iparticle)) continue;
242//
243 Bool_t selected = kTRUE;
244 Bool_t hasSelectedDaughters = kFALSE;
245
246
247 kf = iparticle->GetPdgCode();
248 ks = iparticle->GetStatusCode();
249 if (kf == 92) continue;
250
251 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
252 SelectFlavor(kf);
253 hasSelectedDaughters = DaughtersSelection(iparticle);
254//
255// Put particle on the stack if it is either selected or
256// it is the mother of at least one seleted particle
257//
258 if (selected || hasSelectedDaughters) {
259 nc++;
260 pSelected[i] = 1;
261 } // selected
262 } // particle loop parents
263//
264// Now select the final state particles
265//
266
267 for (i = 0; i<np; i++) {
268 TParticle * iparticle = (TParticle *) fParticles->At(i);
269// Is this a final state particle ?
270 if (!Stable(iparticle)) continue;
271
272 Bool_t selected = kTRUE;
273 kf = iparticle->GetPdgCode();
274 ks = iparticle->GetStatusCode();
275
276// --------------------------------------------------------------------------
277// Count spectator neutrons and protons
f0c86dd6 278 if(ks == 0 || ks == 1){
279 if(kf == kNeutron) fProjectileSpecn += 1;
280 if(kf == kProton) fProjectileSpecp += 1;
281 }
282 else if(ks == 10 || ks == 11){
283 if(kf == kNeutron) fTargetSpecn += 1;
284 if(kf == kProton) fTargetSpecp += 1;
36b81802 285 }
286// --------------------------------------------------------------------------
287//
288 if (!fSelectAll) {
289 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
290 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
291 && ks != 11);
292 }
293//
294// Put particle on the stack if selected
295//
296 if (selected) {
297 nc++;
298 pSelected[i] = 1;
299 } // selected
300 } // particle loop final state
301//
302// Write particles to stack
303//
304 for (i = 0; i<np; i++) {
305 TParticle * iparticle = (TParticle *) fParticles->At(i);
306 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
307 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
308
309 if (pSelected[i]) {
310 kf = iparticle->GetPdgCode();
311 ks = iparticle->GetStatusCode();
312 p[0] = iparticle->Px();
313 p[1] = iparticle->Py();
b25b821e 314 p[2] = iparticle->Pz() * sign;
36b81802 315 origin[0] = origin0[0]+iparticle->Vx()/10;
316 origin[1] = origin0[1]+iparticle->Vy()/10;
317 origin[2] = origin0[2]+iparticle->Vz()/10;
318 tof = kconv*iparticle->T();
319 imo = -1;
320 TParticle* mother = 0;
321 if (hasMother) {
322 imo = iparticle->GetFirstMother();
323 mother = (TParticle *) fParticles->At(imo);
324 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
325 } // if has mother
326 Bool_t tFlag = (fTrackIt && !hasDaughter);
642f15cf 327 PushTrack(tFlag,imo,kf,p,origin,polar,
36b81802 328 tof,kPNoProcess,nt, 1., ks);
329 KeepTrack(nt);
330 newPos[i] = nt;
331 } // if selected
332 } // particle loop
333 delete[] newPos;
334 delete[] pSelected;
335
336 printf("\n I've put %i particles on the stack \n",nc);
337 if (nc > 0) {
338 jev += nc;
339 if (jev >= fNpart || fNpart == -1) {
340 fKineBias = Float_t(fNpart)/Float_t(fTrials);
341 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
342 break;
343 }
344 }
345 } // event loop
346 MakeHeader();
347 SetHighWaterMark(nt);
348}
349
350void AliGenHijing::KeepFullEvent()
351{
352 fKeep=1;
353}
354
355void AliGenHijing::EvaluateCrossSections()
356{
357// Glauber Calculation of geometrical x-section
358//
359 Float_t xTot = 0.; // barn
360 Float_t xTotHard = 0.; // barn
361 Float_t xPart = 0.; // barn
362 Float_t xPartHard = 0.; // barn
363 Float_t sigmaHard = 0.1; // mbarn
364 Float_t bMin = 0.;
365 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
366 const Float_t kdib = 0.2;
367 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
368
369
370 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
371 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
372 Int_t i;
373 Float_t oldvalue= 0.;
374
375 Float_t* b = new Float_t[kMax];
376 Float_t* si1 = new Float_t[kMax];
377 Float_t* si2 = new Float_t[kMax];
378
379 for (i = 0; i < kMax; i++)
380 {
381 Float_t xb = bMin+i*kdib;
382 Float_t ov;
383 ov=fHijing->Profile(xb);
384 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
385 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
386 xTot+=gb;
387 xTotHard += gbh;
388 printf("profile %f %f %f\n", xb, ov, fHijing->GetHINT1(12));
389
390 if (xb > fMinImpactParam && xb < fMaxImpactParam)
391 {
392 xPart += gb;
393 xPartHard += gbh;
394 }
395
396 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
397 oldvalue = xTot;
398 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
399 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
400 if (i>0) {
401 si1[i] = gb/kdib;
402 si2[i] = gbh/gb;
403 b[i] = xb;
404 }
405 }
406
407 printf("\n Total cross section (barn): %f \n",xTot);
408 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
409 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
410 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
411
412// Store result as a graph
413 b[0] = 0;
414 si1[0] = 0;
415 si2[0]=si2[1];
416
417 fDsigmaDb = new TGraph(i, b, si1);
418 fDnDb = new TGraph(i, b, si2);
419}
420
421Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
422{
423//
424// Looks recursively if one of the daughters has been selected
425//
426// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
427 Int_t imin = -1;
428 Int_t imax = -1;
429 Int_t i;
430 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
431 Bool_t selected = kFALSE;
432 if (hasDaughters) {
433 imin = iparticle->GetFirstDaughter();
434 imax = iparticle->GetLastDaughter();
435 for (i = imin; i <= imax; i++){
436 TParticle * jparticle = (TParticle *) fParticles->At(i);
437 Int_t ip = jparticle->GetPdgCode();
438 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
439 selected=kTRUE; break;
440 }
441 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
442 }
443 } else {
444 return kFALSE;
445 }
446 return selected;
447}
448
449
450Bool_t AliGenHijing::SelectFlavor(Int_t pid)
451{
452// Select flavor of particle
453// 0: all
454// 4: charm and beauty
455// 5: beauty
456 Bool_t res = 0;
457
458 if (fFlavor == 0) {
459 res = kTRUE;
460 } else {
461 Int_t ifl = TMath::Abs(pid/100);
462 if (ifl > 10) ifl/=10;
463 res = (fFlavor == ifl);
464 }
465//
466// This part if gamma writing is inhibited
467 if (fNoGammas)
468 res = res && (pid != kGamma && pid != kPi0);
469//
470 return res;
471}
472
14cae7e9 473Bool_t AliGenHijing::Stable(TParticle* particle) const
36b81802 474{
475// Return true for a stable particle
476//
477
478 if (particle->GetFirstDaughter() < 0 )
479 {
480 return kTRUE;
481 } else {
482 return kFALSE;
483 }
484}
485
486
36b81802 487
488void AliGenHijing::MakeHeader()
489{
490// Builds the event header, to be called after each event
491 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
492 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
493 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
494 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
495 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
496 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
497 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
498 fHijing->GetN01(),
499 fHijing->GetN10(),
500 fHijing->GetN11());
f0c86dd6 501 ((AliGenHijingEventHeader*) header)->SetSpectators(fProjectileSpecn, fProjectileSpecp,
502 fTargetSpecn,fTargetSpecp);
36b81802 503
504// 4-momentum vectors of the triggered jets.
505//
506// Before final state gluon radiation.
507 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
508 fHijing->GetHINT1(22),
509 fHijing->GetHINT1(23),
510 fHijing->GetHINT1(24));
511
512 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
513 fHijing->GetHINT1(32),
514 fHijing->GetHINT1(33),
515 fHijing->GetHINT1(34));
516// After final state gluon radiation.
517 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
518 fHijing->GetHINT1(27),
519 fHijing->GetHINT1(28),
520 fHijing->GetHINT1(29));
521
522 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
523 fHijing->GetHINT1(37),
524 fHijing->GetHINT1(38),
525 fHijing->GetHINT1(39));
526 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
527// Bookkeeping for kinematic bias
528 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
529// Event Vertex
0c0c6204 530 header->SetPrimaryVertex(fVertex);
7ba30f95 531 if (gAlice) gAlice->SetGenEventHeader(header);
36b81802 532 fCollisionGeometry = (AliGenHijingEventHeader*) header;
533}
534
535Bool_t AliGenHijing::CheckTrigger()
536{
537// Check the kinematic trigger condition
538//
539 Bool_t triggered = kFALSE;
540
541 if (fTrigger == 1) {
542//
543// jet-jet Trigger
544
545 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
546 fHijing->GetHINT1(27),
547 fHijing->GetHINT1(28),
548 fHijing->GetHINT1(29));
549
550 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
551 fHijing->GetHINT1(37),
552 fHijing->GetHINT1(38),
553 fHijing->GetHINT1(39));
554 Double_t eta1 = jet1->Eta();
555 Double_t eta2 = jet2->Eta();
556 Double_t phi1 = jet1->Phi();
557 Double_t phi2 = jet2->Phi();
558// printf("\n Trigger: %f %f %f %f",
559// fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
560 if (
561 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
562 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
563 ||
564 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
565 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
566 )
567 triggered = kTRUE;
568 } else if (fTrigger == 2) {
569// Gamma Jet
570//
571 Int_t np = fParticles->GetEntriesFast();
572 for (Int_t i = 0; i < np; i++) {
573 TParticle* part = (TParticle*) fParticles->At(i);
574 Int_t kf = part->GetPdgCode();
575 Int_t ks = part->GetStatusCode();
576 if (kf == 22 && ks == 40) {
577 Float_t phi = part->Phi();
578 Float_t eta = part->Eta();
579 if (eta < fEtaMaxJet &&
580 eta > fEtaMinJet &&
581 phi < fPhiMaxJet &&
582 phi > fPhiMinJet) {
583 triggered = 1;
584 break;
585 } // check phi,eta within limits
586 } // direct gamma ?
587 } // particle loop
588 } // fTrigger == 2
589 return triggered;
590}
591
592
39192f05 593void AliGenHijing::Copy(TObject &) const
9c63d20a 594{
595 Fatal("Copy","Not implemented!\n");
596}
36b81802 597
598AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
599{
9c63d20a 600 rhs.Copy(*this);
601 return (*this);
36b81802 602}
603