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