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[u/mrichter/AliRoot.git] / THijing / AliGenHijing.cxx
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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
36b81802 193 while(1)
194 {
195// Generate one event
196// --------------------------------------------------------------------------
197 fSpecn = 0;
198 fSpecp = 0;
199// --------------------------------------------------------------------------
200 fHijing->GenerateEvent();
201 fTrials++;
202 fHijing->ImportParticles(fParticles,"All");
203 if (fTrigger != kNoTrigger) {
204 if (!CheckTrigger()) continue;
205 }
71ea527c 206 if (fLHC) Boost();
36b81802 207
208
209 Int_t np = fParticles->GetEntriesFast();
210 printf("\n **************************************************%d\n",np);
211 Int_t nc = 0;
212 if (np == 0 ) continue;
213 Int_t i;
214 Int_t* newPos = new Int_t[np];
215 Int_t* pSelected = new Int_t[np];
216
217 for (i = 0; i < np; i++) {
218 newPos[i] = i;
219 pSelected[i] = 0;
220 }
221
222// Get event vertex
223//
224 TParticle * iparticle = (TParticle *) fParticles->At(0);
0c0c6204 225 fVertex[0] = origin0[0];
226 fVertex[1] = origin0[1];
227 fVertex[2] = origin0[2];
36b81802 228
229//
230// First select parent particles
231//
232
233 for (i = 0; i < np; i++) {
234 iparticle = (TParticle *) fParticles->At(i);
235
236// Is this a parent particle ?
237 if (Stable(iparticle)) continue;
238//
239 Bool_t selected = kTRUE;
240 Bool_t hasSelectedDaughters = kFALSE;
241
242
243 kf = iparticle->GetPdgCode();
244 ks = iparticle->GetStatusCode();
245 if (kf == 92) continue;
246
247 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
248 SelectFlavor(kf);
249 hasSelectedDaughters = DaughtersSelection(iparticle);
250//
251// Put particle on the stack if it is either selected or
252// it is the mother of at least one seleted particle
253//
254 if (selected || hasSelectedDaughters) {
255 nc++;
256 pSelected[i] = 1;
257 } // selected
258 } // particle loop parents
259//
260// Now select the final state particles
261//
262
263 for (i = 0; i<np; i++) {
264 TParticle * iparticle = (TParticle *) fParticles->At(i);
265// Is this a final state particle ?
266 if (!Stable(iparticle)) continue;
267
268 Bool_t selected = kTRUE;
269 kf = iparticle->GetPdgCode();
270 ks = iparticle->GetStatusCode();
271
272// --------------------------------------------------------------------------
273// Count spectator neutrons and protons
274 if(ks == 0 || ks == 1 || ks == 10 || ks == 11){
275 if(kf == kNeutron) fSpecn += 1;
276 if(kf == kProton) fSpecp += 1;
277 }
278// --------------------------------------------------------------------------
279//
280 if (!fSelectAll) {
281 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
282 if (!fSpectators && selected) selected = (ks != 0 && ks != 1 && ks != 10
283 && ks != 11);
284 }
285//
286// Put particle on the stack if selected
287//
288 if (selected) {
289 nc++;
290 pSelected[i] = 1;
291 } // selected
292 } // particle loop final state
293//
294// Write particles to stack
295//
296 for (i = 0; i<np; i++) {
297 TParticle * iparticle = (TParticle *) fParticles->At(i);
298 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
299 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
300
301 if (pSelected[i]) {
302 kf = iparticle->GetPdgCode();
303 ks = iparticle->GetStatusCode();
304 p[0] = iparticle->Px();
305 p[1] = iparticle->Py();
306 p[2] = iparticle->Pz();
307 origin[0] = origin0[0]+iparticle->Vx()/10;
308 origin[1] = origin0[1]+iparticle->Vy()/10;
309 origin[2] = origin0[2]+iparticle->Vz()/10;
310 tof = kconv*iparticle->T();
311 imo = -1;
312 TParticle* mother = 0;
313 if (hasMother) {
314 imo = iparticle->GetFirstMother();
315 mother = (TParticle *) fParticles->At(imo);
316 imo = (mother->GetPdgCode() != 92) ? imo = newPos[imo] : -1;
317 } // if has mother
318 Bool_t tFlag = (fTrackIt && !hasDaughter);
642f15cf 319 PushTrack(tFlag,imo,kf,p,origin,polar,
36b81802 320 tof,kPNoProcess,nt, 1., ks);
321 KeepTrack(nt);
322 newPos[i] = nt;
323 } // if selected
324 } // particle loop
325 delete[] newPos;
326 delete[] pSelected;
327
328 printf("\n I've put %i particles on the stack \n",nc);
329 if (nc > 0) {
330 jev += nc;
331 if (jev >= fNpart || fNpart == -1) {
332 fKineBias = Float_t(fNpart)/Float_t(fTrials);
333 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
334 break;
335 }
336 }
337 } // event loop
338 MakeHeader();
339 SetHighWaterMark(nt);
340}
341
342void AliGenHijing::KeepFullEvent()
343{
344 fKeep=1;
345}
346
347void AliGenHijing::EvaluateCrossSections()
348{
349// Glauber Calculation of geometrical x-section
350//
351 Float_t xTot = 0.; // barn
352 Float_t xTotHard = 0.; // barn
353 Float_t xPart = 0.; // barn
354 Float_t xPartHard = 0.; // barn
355 Float_t sigmaHard = 0.1; // mbarn
356 Float_t bMin = 0.;
357 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
358 const Float_t kdib = 0.2;
359 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
360
361
362 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
363 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
364 Int_t i;
365 Float_t oldvalue= 0.;
366
367 Float_t* b = new Float_t[kMax];
368 Float_t* si1 = new Float_t[kMax];
369 Float_t* si2 = new Float_t[kMax];
370
371 for (i = 0; i < kMax; i++)
372 {
373 Float_t xb = bMin+i*kdib;
374 Float_t ov;
375 ov=fHijing->Profile(xb);
376 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
377 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
378 xTot+=gb;
379 xTotHard += gbh;
380 printf("profile %f %f %f\n", xb, ov, fHijing->GetHINT1(12));
381
382 if (xb > fMinImpactParam && xb < fMaxImpactParam)
383 {
384 xPart += gb;
385 xPartHard += gbh;
386 }
387
388 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
389 oldvalue = xTot;
390 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
391 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
392 if (i>0) {
393 si1[i] = gb/kdib;
394 si2[i] = gbh/gb;
395 b[i] = xb;
396 }
397 }
398
399 printf("\n Total cross section (barn): %f \n",xTot);
400 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
401 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
402 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
403
404// Store result as a graph
405 b[0] = 0;
406 si1[0] = 0;
407 si2[0]=si2[1];
408
409 fDsigmaDb = new TGraph(i, b, si1);
410 fDnDb = new TGraph(i, b, si2);
411}
412
413Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
414{
415//
416// Looks recursively if one of the daughters has been selected
417//
418// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
419 Int_t imin = -1;
420 Int_t imax = -1;
421 Int_t i;
422 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
423 Bool_t selected = kFALSE;
424 if (hasDaughters) {
425 imin = iparticle->GetFirstDaughter();
426 imax = iparticle->GetLastDaughter();
427 for (i = imin; i <= imax; i++){
428 TParticle * jparticle = (TParticle *) fParticles->At(i);
429 Int_t ip = jparticle->GetPdgCode();
430 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
431 selected=kTRUE; break;
432 }
433 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
434 }
435 } else {
436 return kFALSE;
437 }
438 return selected;
439}
440
441
442Bool_t AliGenHijing::SelectFlavor(Int_t pid)
443{
444// Select flavor of particle
445// 0: all
446// 4: charm and beauty
447// 5: beauty
448 Bool_t res = 0;
449
450 if (fFlavor == 0) {
451 res = kTRUE;
452 } else {
453 Int_t ifl = TMath::Abs(pid/100);
454 if (ifl > 10) ifl/=10;
455 res = (fFlavor == ifl);
456 }
457//
458// This part if gamma writing is inhibited
459 if (fNoGammas)
460 res = res && (pid != kGamma && pid != kPi0);
461//
462 return res;
463}
464
14cae7e9 465Bool_t AliGenHijing::Stable(TParticle* particle) const
36b81802 466{
467// Return true for a stable particle
468//
469
470 if (particle->GetFirstDaughter() < 0 )
471 {
472 return kTRUE;
473 } else {
474 return kFALSE;
475 }
476}
477
478
36b81802 479
480void AliGenHijing::MakeHeader()
481{
482// Builds the event header, to be called after each event
483 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
484 ((AliGenHijingEventHeader*) header)->SetNProduced(fHijing->GetNATT());
485 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
486 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
487 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
488 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
489 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
490 fHijing->GetN01(),
491 fHijing->GetN10(),
492 fHijing->GetN11());
493 ((AliGenHijingEventHeader*) header)->SetSpectators(fSpecn, fSpecp);
494
495// 4-momentum vectors of the triggered jets.
496//
497// Before final state gluon radiation.
498 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
499 fHijing->GetHINT1(22),
500 fHijing->GetHINT1(23),
501 fHijing->GetHINT1(24));
502
503 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
504 fHijing->GetHINT1(32),
505 fHijing->GetHINT1(33),
506 fHijing->GetHINT1(34));
507// After final state gluon radiation.
508 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
509 fHijing->GetHINT1(27),
510 fHijing->GetHINT1(28),
511 fHijing->GetHINT1(29));
512
513 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
514 fHijing->GetHINT1(37),
515 fHijing->GetHINT1(38),
516 fHijing->GetHINT1(39));
517 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
518// Bookkeeping for kinematic bias
519 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
520// Event Vertex
0c0c6204 521 header->SetPrimaryVertex(fVertex);
7ba30f95 522 if (gAlice) gAlice->SetGenEventHeader(header);
36b81802 523 fCollisionGeometry = (AliGenHijingEventHeader*) header;
524}
525
526Bool_t AliGenHijing::CheckTrigger()
527{
528// Check the kinematic trigger condition
529//
530 Bool_t triggered = kFALSE;
531
532 if (fTrigger == 1) {
533//
534// jet-jet Trigger
535
536 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
537 fHijing->GetHINT1(27),
538 fHijing->GetHINT1(28),
539 fHijing->GetHINT1(29));
540
541 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
542 fHijing->GetHINT1(37),
543 fHijing->GetHINT1(38),
544 fHijing->GetHINT1(39));
545 Double_t eta1 = jet1->Eta();
546 Double_t eta2 = jet2->Eta();
547 Double_t phi1 = jet1->Phi();
548 Double_t phi2 = jet2->Phi();
549// printf("\n Trigger: %f %f %f %f",
550// fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
551 if (
552 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
553 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
554 ||
555 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
556 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
557 )
558 triggered = kTRUE;
559 } else if (fTrigger == 2) {
560// Gamma Jet
561//
562 Int_t np = fParticles->GetEntriesFast();
563 for (Int_t i = 0; i < np; i++) {
564 TParticle* part = (TParticle*) fParticles->At(i);
565 Int_t kf = part->GetPdgCode();
566 Int_t ks = part->GetStatusCode();
567 if (kf == 22 && ks == 40) {
568 Float_t phi = part->Phi();
569 Float_t eta = part->Eta();
570 if (eta < fEtaMaxJet &&
571 eta > fEtaMinJet &&
572 phi < fPhiMaxJet &&
573 phi > fPhiMinJet) {
574 triggered = 1;
575 break;
576 } // check phi,eta within limits
577 } // direct gamma ?
578 } // particle loop
579 } // fTrigger == 2
580 return triggered;
581}
582
583
39192f05 584void AliGenHijing::Copy(TObject &) const
9c63d20a 585{
586 Fatal("Copy","Not implemented!\n");
587}
36b81802 588
589AliGenHijing& AliGenHijing::operator=(const AliGenHijing& rhs)
590{
9c63d20a 591 rhs.Copy(*this);
592 return (*this);
36b81802 593}
594