Compilation on win32gcc: AliGenBeamGasNew moved to THijing to avoid circular dependence
[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
3010c308 25#include <TClonesArray.h>
36b81802 26#include <TGraph.h>
27#include <THijing.h>
28#include <TLorentzVector.h>
29#include <TPDGCode.h>
30#include <TParticle.h>
31
32#include "AliGenHijing.h"
33#include "AliGenHijingEventHeader.h"
34#include "AliRun.h"
7cdba479 35#include "AliHijingRndm.h"
36b81802 36
7cdba479 37ClassImp(AliGenHijing)
36b81802 38
39AliGenHijing::AliGenHijing()
9d89c88d 40 :AliGenMC(),
41 fFrame("CMS"),
42 fMinImpactParam(0.),
43 fMaxImpactParam(5.),
44 fKeep(0),
45 fQuench(1),
46 fShadowing(1),
47 fDecaysOff(1),
48 fTrigger(0),
49 fEvaluate(0),
50 fSelectAll(0),
51 fFlavor(0),
52 fEnergyCMS(5500.),
53 fKineBias(0.),
54 fTrials(0),
55 fXsection(0.),
56 fHijing(0),
57 fPtHardMin(0.),
58 fPtHardMax(1.e4),
59 fSpectators(1),
60 fDsigmaDb(0),
61 fDnDb(0),
62 fPtMinJet(-2.5),
63 fEtaMinJet(-20.),
64 fEtaMaxJet(+20.),
65 fPhiMinJet(0.),
66 fPhiMaxJet(2. * TMath::Pi()),
67 fRadiation(3),
68 fSimpleJet(kFALSE),
69 fNoGammas(kFALSE),
70 fProjectileSpecn(0),
71 fProjectileSpecp(0),
72 fTargetSpecn(0),
73 fTargetSpecp(0),
74 fLHC(kFALSE),
75 fRandomPz(kFALSE),
76 fNoHeavyQuarks(kFALSE)
36b81802 77{
78// Constructor
79 fParticles = 0;
7cdba479 80 AliHijingRndm::SetHijingRandom(GetRandom());
36b81802 81}
82
83AliGenHijing::AliGenHijing(Int_t npart)
9d89c88d 84 :AliGenMC(npart),
85 fFrame("CMS"),
86 fMinImpactParam(0.),
87 fMaxImpactParam(5.),
88 fKeep(0),
89 fQuench(1),
90 fShadowing(1),
91 fDecaysOff(1),
92 fTrigger(0),
93 fEvaluate(0),
94 fSelectAll(0),
95 fFlavor(0),
96 fEnergyCMS(5500.),
97 fKineBias(0.),
98 fTrials(0),
99 fXsection(0.),
100 fHijing(0),
101 fPtHardMin(0.),
102 fPtHardMax(1.e4),
103 fSpectators(1),
104 fDsigmaDb(0),
105 fDnDb(0),
106 fPtMinJet(-2.5),
107 fEtaMinJet(-20.),
108 fEtaMaxJet(+20.),
109 fPhiMinJet(0.),
110 fPhiMaxJet(2. * TMath::Pi()),
111 fRadiation(3),
112 fSimpleJet(kFALSE),
113 fNoGammas(kFALSE),
114 fProjectileSpecn(0),
115 fProjectileSpecp(0),
116 fTargetSpecn(0),
117 fTargetSpecp(0),
118 fLHC(kFALSE),
119 fRandomPz(kFALSE),
120 fNoHeavyQuarks(kFALSE)
36b81802 121{
122// Default PbPb collisions at 5. 5 TeV
123//
124 fName = "Hijing";
125 fTitle= "Particle Generator using HIJING";
36b81802 126//
127 fParticles = new TClonesArray("TParticle",10000);
128//
129// Set random number generator
7cdba479 130 AliHijingRndm::SetHijingRandom(GetRandom());
36b81802 131}
132
36b81802 133AliGenHijing::~AliGenHijing()
134{
135// Destructor
136 if ( fDsigmaDb) delete fDsigmaDb;
137 if ( fDnDb) delete fDnDb;
138 delete fParticles;
139}
140
141void AliGenHijing::Init()
142{
143// Initialisation
144 fFrame.Resize(8);
145 fTarget.Resize(8);
146 fProjectile.Resize(8);
147
148 SetMC(new THijing(fEnergyCMS, fFrame, fProjectile, fTarget,
149 fAProjectile, fZProjectile, fATarget, fZTarget,
150 fMinImpactParam, fMaxImpactParam));
151
b88f5cea 152 fHijing=(THijing*) fMCEvGen;
36b81802 153 fHijing->SetIHPR2(2, fRadiation);
154 fHijing->SetIHPR2(3, fTrigger);
155 fHijing->SetIHPR2(6, fShadowing);
156 fHijing->SetIHPR2(12, fDecaysOff);
157 fHijing->SetIHPR2(21, fKeep);
158 fHijing->SetHIPR1(10, fPtMinJet);
159 fHijing->SetHIPR1(50, fSimpleJet);
160//
161// Quenching
162//
163//
164// fQuench = 0: no quenching
165// fQuench = 1: hijing default
166// fQuench = 2: new LHC parameters for HIPR1(11) and HIPR1(14)
167// fQuench = 3: new RHIC parameters for HIPR1(11) and HIPR1(14)
168// fQuench = 4: new LHC parameters with log(e) dependence
169// fQuench = 5: new RHIC parameters with log(e) dependence
170 fHijing->SetIHPR2(50, 0);
171 if (fQuench > 0)
172 fHijing->SetIHPR2(4, 1);
173 else
174 fHijing->SetIHPR2(4, 0);
175// New LHC parameters from Xin-Nian Wang
176 if (fQuench == 2) {
177 fHijing->SetHIPR1(14, 1.1);
178 fHijing->SetHIPR1(11, 3.7);
179 } else if (fQuench == 3) {
180 fHijing->SetHIPR1(14, 0.20);
181 fHijing->SetHIPR1(11, 2.5);
182 } else if (fQuench == 4) {
183 fHijing->SetIHPR2(50, 1);
184 fHijing->SetHIPR1(14, 4.*0.34);
185 fHijing->SetHIPR1(11, 3.7);
186 } else if (fQuench == 5) {
187 fHijing->SetIHPR2(50, 1);
188 fHijing->SetHIPR1(14, 0.34);
189 fHijing->SetHIPR1(11, 2.5);
190 }
191
f82795ff 192//
193// Heavy quarks
194//
195 if (fNoHeavyQuarks) {
196 fHijing->SetIHPR2(49, 1);
197 } else {
198 fHijing->SetIHPR2(49, 0);
199 }
200
36b81802 201
cc463e4a 202 AliGenMC::Init();
36b81802 203
204//
205// Initialize Hijing
206//
207 fHijing->Initialize();
208//
209 if (fEvaluate) EvaluateCrossSections();
210//
211}
212
213void AliGenHijing::Generate()
214{
215// Generate one event
216
217 Float_t polar[3] = {0,0,0};
218 Float_t origin[3] = {0,0,0};
219 Float_t origin0[3] = {0,0,0};
0c0c6204 220 Float_t p[3];
36b81802 221 Float_t tof;
222
223// converts from mm/c to s
14bca1e5 224 const Float_t kconv = 0.001/2.99792458e8;
36b81802 225//
226 Int_t nt = 0;
227 Int_t jev = 0;
2d677e30 228 Int_t j, kf, ks, ksp, imo;
36b81802 229 kf = 0;
230
231
232
233 fTrials = 0;
e60d2969 234
36b81802 235 for (j = 0;j < 3; j++) origin0[j] = fOrigin[j];
236 if(fVertexSmear == kPerEvent) {
0c0c6204 237 Vertex();
238 for (j=0; j < 3; j++) origin0[j] = fVertex[j];
239 }
240
b25b821e 241
242 Float_t sign = (fRandomPz && (Rndm() < 0.5))? -1. : 1.;
36b81802 243 while(1)
244 {
245// Generate one event
246// --------------------------------------------------------------------------
f0c86dd6 247 fProjectileSpecn = 0;
248 fProjectileSpecp = 0;
b25b821e 249 fTargetSpecn = 0;
250 fTargetSpecp = 0;
36b81802 251// --------------------------------------------------------------------------
252 fHijing->GenerateEvent();
253 fTrials++;
e60d2969 254 fNprimaries = 0;
36b81802 255 fHijing->ImportParticles(fParticles,"All");
256 if (fTrigger != kNoTrigger) {
257 if (!CheckTrigger()) continue;
258 }
71ea527c 259 if (fLHC) Boost();
36b81802 260
261
262 Int_t np = fParticles->GetEntriesFast();
263 printf("\n **************************************************%d\n",np);
264 Int_t nc = 0;
265 if (np == 0 ) continue;
266 Int_t i;
267 Int_t* newPos = new Int_t[np];
268 Int_t* pSelected = new Int_t[np];
269
270 for (i = 0; i < np; i++) {
271 newPos[i] = i;
272 pSelected[i] = 0;
273 }
274
275// Get event vertex
276//
277 TParticle * iparticle = (TParticle *) fParticles->At(0);
0c0c6204 278 fVertex[0] = origin0[0];
279 fVertex[1] = origin0[1];
280 fVertex[2] = origin0[2];
36b81802 281
282//
283// First select parent particles
284//
285
286 for (i = 0; i < np; i++) {
287 iparticle = (TParticle *) fParticles->At(i);
288
289// Is this a parent particle ?
290 if (Stable(iparticle)) continue;
291//
292 Bool_t selected = kTRUE;
293 Bool_t hasSelectedDaughters = kFALSE;
294
295
296 kf = iparticle->GetPdgCode();
297 ks = iparticle->GetStatusCode();
298 if (kf == 92) continue;
299
300 if (!fSelectAll) selected = KinematicSelection(iparticle, 0) &&
301 SelectFlavor(kf);
302 hasSelectedDaughters = DaughtersSelection(iparticle);
303//
304// Put particle on the stack if it is either selected or
305// it is the mother of at least one seleted particle
306//
307 if (selected || hasSelectedDaughters) {
308 nc++;
309 pSelected[i] = 1;
310 } // selected
311 } // particle loop parents
312//
313// Now select the final state particles
314//
315
316 for (i = 0; i<np; i++) {
317 TParticle * iparticle = (TParticle *) fParticles->At(i);
318// Is this a final state particle ?
319 if (!Stable(iparticle)) continue;
320
321 Bool_t selected = kTRUE;
322 kf = iparticle->GetPdgCode();
323 ks = iparticle->GetStatusCode();
2d677e30 324 ksp = iparticle->GetUniqueID();
36b81802 325
326// --------------------------------------------------------------------------
327// Count spectator neutrons and protons
2d677e30 328 if(ksp == 0 || ksp == 1){
f0c86dd6 329 if(kf == kNeutron) fProjectileSpecn += 1;
330 if(kf == kProton) fProjectileSpecp += 1;
331 }
2d677e30 332 else if(ksp == 10 || ksp == 11){
f0c86dd6 333 if(kf == kNeutron) fTargetSpecn += 1;
334 if(kf == kProton) fTargetSpecp += 1;
36b81802 335 }
336// --------------------------------------------------------------------------
337//
338 if (!fSelectAll) {
339 selected = KinematicSelection(iparticle,0)&&SelectFlavor(kf);
2d677e30 340 if (!fSpectators && selected) selected = (ksp != 0 && ksp != 1 && ksp != 10
341 && ksp != 11);
36b81802 342 }
343//
344// Put particle on the stack if selected
345//
346 if (selected) {
347 nc++;
348 pSelected[i] = 1;
349 } // selected
350 } // particle loop final state
3439da17 351
36b81802 352//
3439da17 353// Time of the interactions
354 Float_t tInt = 0.;
355 if (fPileUpTimeWindow > 0.) tInt = fPileUpTimeWindow * (2. * gRandom->Rndm() - 1.);
356
36b81802 357//
3439da17 358// Write particles to stack
359
36b81802 360 for (i = 0; i<np; i++) {
361 TParticle * iparticle = (TParticle *) fParticles->At(i);
362 Bool_t hasMother = (iparticle->GetFirstMother() >=0);
363 Bool_t hasDaughter = (iparticle->GetFirstDaughter() >=0);
36b81802 364 if (pSelected[i]) {
365 kf = iparticle->GetPdgCode();
366 ks = iparticle->GetStatusCode();
367 p[0] = iparticle->Px();
368 p[1] = iparticle->Py();
b25b821e 369 p[2] = iparticle->Pz() * sign;
36b81802 370 origin[0] = origin0[0]+iparticle->Vx()/10;
371 origin[1] = origin0[1]+iparticle->Vy()/10;
372 origin[2] = origin0[2]+iparticle->Vz()/10;
3439da17 373 tof = kconv * iparticle->T() + sign * origin0[2] / 3.e10;
374 if (fPileUpTimeWindow > 0.) tof += tInt;
375
36b81802 376 imo = -1;
377 TParticle* mother = 0;
378 if (hasMother) {
379 imo = iparticle->GetFirstMother();
380 mother = (TParticle *) fParticles->At(imo);
e57522c0 381 imo = (mother->GetPdgCode() != 92) ? newPos[imo] : -1;
36b81802 382 } // if has mother
383 Bool_t tFlag = (fTrackIt && !hasDaughter);
3439da17 384 PushTrack(tFlag,imo,kf,p,origin,polar,tof,kPNoProcess,nt, 1., ks);
e60d2969 385 fNprimaries++;
36b81802 386 KeepTrack(nt);
387 newPos[i] = nt;
388 } // if selected
389 } // particle loop
390 delete[] newPos;
391 delete[] pSelected;
392
393 printf("\n I've put %i particles on the stack \n",nc);
394 if (nc > 0) {
395 jev += nc;
396 if (jev >= fNpart || fNpart == -1) {
397 fKineBias = Float_t(fNpart)/Float_t(fTrials);
398 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
399 break;
400 }
401 }
402 } // event loop
403 MakeHeader();
404 SetHighWaterMark(nt);
405}
406
407void AliGenHijing::KeepFullEvent()
408{
409 fKeep=1;
410}
411
412void AliGenHijing::EvaluateCrossSections()
413{
414// Glauber Calculation of geometrical x-section
415//
416 Float_t xTot = 0.; // barn
417 Float_t xTotHard = 0.; // barn
418 Float_t xPart = 0.; // barn
419 Float_t xPartHard = 0.; // barn
420 Float_t sigmaHard = 0.1; // mbarn
421 Float_t bMin = 0.;
422 Float_t bMax = fHijing->GetHIPR1(34)+fHijing->GetHIPR1(35);
423 const Float_t kdib = 0.2;
424 Int_t kMax = Int_t((bMax-bMin)/kdib)+1;
425
426
427 printf("\n Projectile Radius (fm): %f \n",fHijing->GetHIPR1(34));
428 printf("\n Target Radius (fm): %f \n",fHijing->GetHIPR1(35));
429 Int_t i;
430 Float_t oldvalue= 0.;
431
432 Float_t* b = new Float_t[kMax];
433 Float_t* si1 = new Float_t[kMax];
434 Float_t* si2 = new Float_t[kMax];
435
436 for (i = 0; i < kMax; i++)
437 {
438 Float_t xb = bMin+i*kdib;
439 Float_t ov;
440 ov=fHijing->Profile(xb);
441 Float_t gb = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*(1.-TMath::Exp(-fHijing->GetHINT1(12)*ov));
442 Float_t gbh = 2.*0.01*fHijing->GetHIPR1(40)*kdib*xb*sigmaHard*ov;
443 xTot+=gb;
444 xTotHard += gbh;
445 printf("profile %f %f %f\n", xb, ov, fHijing->GetHINT1(12));
446
447 if (xb > fMinImpactParam && xb < fMaxImpactParam)
448 {
449 xPart += gb;
450 xPartHard += gbh;
451 }
452
453 if(oldvalue) if ((xTot-oldvalue)/oldvalue<0.0001) break;
454 oldvalue = xTot;
455 printf("\n Total cross section (barn): %d %f %f \n",i, xb, xTot);
456 printf("\n Hard cross section (barn): %d %f %f \n\n",i, xb, xTotHard);
457 if (i>0) {
458 si1[i] = gb/kdib;
459 si2[i] = gbh/gb;
460 b[i] = xb;
461 }
462 }
463
464 printf("\n Total cross section (barn): %f \n",xTot);
465 printf("\n Hard cross section (barn): %f \n \n",xTotHard);
466 printf("\n Partial cross section (barn): %f %f \n",xPart, xPart/xTot*100.);
467 printf("\n Partial hard cross section (barn): %f %f \n",xPartHard, xPartHard/xTotHard*100.);
468
469// Store result as a graph
470 b[0] = 0;
471 si1[0] = 0;
472 si2[0]=si2[1];
473
474 fDsigmaDb = new TGraph(i, b, si1);
475 fDnDb = new TGraph(i, b, si2);
476}
477
478Bool_t AliGenHijing::DaughtersSelection(TParticle* iparticle)
479{
480//
481// Looks recursively if one of the daughters has been selected
482//
483// printf("\n Consider daughters %d:",iparticle->GetPdgCode());
484 Int_t imin = -1;
485 Int_t imax = -1;
486 Int_t i;
487 Bool_t hasDaughters = (iparticle->GetFirstDaughter() >=0);
488 Bool_t selected = kFALSE;
489 if (hasDaughters) {
490 imin = iparticle->GetFirstDaughter();
491 imax = iparticle->GetLastDaughter();
492 for (i = imin; i <= imax; i++){
493 TParticle * jparticle = (TParticle *) fParticles->At(i);
494 Int_t ip = jparticle->GetPdgCode();
495 if (KinematicSelection(jparticle,0)&&SelectFlavor(ip)) {
496 selected=kTRUE; break;
497 }
498 if (DaughtersSelection(jparticle)) {selected=kTRUE; break; }
499 }
500 } else {
501 return kFALSE;
502 }
503 return selected;
504}
505
506
507Bool_t AliGenHijing::SelectFlavor(Int_t pid)
508{
509// Select flavor of particle
510// 0: all
511// 4: charm and beauty
512// 5: beauty
513 Bool_t res = 0;
514
515 if (fFlavor == 0) {
516 res = kTRUE;
517 } else {
518 Int_t ifl = TMath::Abs(pid/100);
519 if (ifl > 10) ifl/=10;
520 res = (fFlavor == ifl);
521 }
522//
523// This part if gamma writing is inhibited
524 if (fNoGammas)
525 res = res && (pid != kGamma && pid != kPi0);
526//
527 return res;
528}
529
14cae7e9 530Bool_t AliGenHijing::Stable(TParticle* particle) const
36b81802 531{
532// Return true for a stable particle
533//
534
535 if (particle->GetFirstDaughter() < 0 )
536 {
537 return kTRUE;
538 } else {
539 return kFALSE;
540 }
541}
542
543
36b81802 544
545void AliGenHijing::MakeHeader()
546{
547// Builds the event header, to be called after each event
548 AliGenEventHeader* header = new AliGenHijingEventHeader("Hijing");
e60d2969 549 ((AliGenHijingEventHeader*) header)->SetNProduced(fNprimaries);
36b81802 550 ((AliGenHijingEventHeader*) header)->SetImpactParameter(fHijing->GetHINT1(19));
551 ((AliGenHijingEventHeader*) header)->SetTotalEnergy(fHijing->GetEATT());
552 ((AliGenHijingEventHeader*) header)->SetHardScatters(fHijing->GetJATT());
553 ((AliGenHijingEventHeader*) header)->SetParticipants(fHijing->GetNP(), fHijing->GetNT());
554 ((AliGenHijingEventHeader*) header)->SetCollisions(fHijing->GetN0(),
555 fHijing->GetN01(),
556 fHijing->GetN10(),
557 fHijing->GetN11());
f0c86dd6 558 ((AliGenHijingEventHeader*) header)->SetSpectators(fProjectileSpecn, fProjectileSpecp,
559 fTargetSpecn,fTargetSpecp);
3c0c211c 560 ((AliGenHijingEventHeader*) header)->SetReactionPlaneAngle(fHijing->GetHINT1(20));
561
562
36b81802 563
564// 4-momentum vectors of the triggered jets.
565//
566// Before final state gluon radiation.
567 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(21),
568 fHijing->GetHINT1(22),
569 fHijing->GetHINT1(23),
570 fHijing->GetHINT1(24));
571
572 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(31),
573 fHijing->GetHINT1(32),
574 fHijing->GetHINT1(33),
575 fHijing->GetHINT1(34));
576// After final state gluon radiation.
577 TLorentzVector* jet3 = new TLorentzVector(fHijing->GetHINT1(26),
578 fHijing->GetHINT1(27),
579 fHijing->GetHINT1(28),
580 fHijing->GetHINT1(29));
581
582 TLorentzVector* jet4 = new TLorentzVector(fHijing->GetHINT1(36),
583 fHijing->GetHINT1(37),
584 fHijing->GetHINT1(38),
585 fHijing->GetHINT1(39));
586 ((AliGenHijingEventHeader*) header)->SetJets(jet1, jet2, jet3, jet4);
587// Bookkeeping for kinematic bias
588 ((AliGenHijingEventHeader*) header)->SetTrials(fTrials);
589// Event Vertex
0c0c6204 590 header->SetPrimaryVertex(fVertex);
cf57b268 591 AddHeader(header);
36b81802 592 fCollisionGeometry = (AliGenHijingEventHeader*) header;
593}
594
cf57b268 595
36b81802 596Bool_t AliGenHijing::CheckTrigger()
597{
598// Check the kinematic trigger condition
599//
600 Bool_t triggered = kFALSE;
601
602 if (fTrigger == 1) {
603//
604// jet-jet Trigger
605
606 TLorentzVector* jet1 = new TLorentzVector(fHijing->GetHINT1(26),
607 fHijing->GetHINT1(27),
608 fHijing->GetHINT1(28),
609 fHijing->GetHINT1(29));
610
611 TLorentzVector* jet2 = new TLorentzVector(fHijing->GetHINT1(36),
612 fHijing->GetHINT1(37),
613 fHijing->GetHINT1(38),
614 fHijing->GetHINT1(39));
615 Double_t eta1 = jet1->Eta();
616 Double_t eta2 = jet2->Eta();
617 Double_t phi1 = jet1->Phi();
618 Double_t phi2 = jet2->Phi();
619// printf("\n Trigger: %f %f %f %f",
620// fEtaMinJet, fEtaMaxJet, fPhiMinJet, fPhiMaxJet);
621 if (
622 (eta1 < fEtaMaxJet && eta1 > fEtaMinJet &&
623 phi1 < fPhiMaxJet && phi1 > fPhiMinJet)
624 ||
625 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet &&
626 phi2 < fPhiMaxJet && phi2 > fPhiMinJet)
627 )
628 triggered = kTRUE;
629 } else if (fTrigger == 2) {
630// Gamma Jet
631//
632 Int_t np = fParticles->GetEntriesFast();
633 for (Int_t i = 0; i < np; i++) {
634 TParticle* part = (TParticle*) fParticles->At(i);
635 Int_t kf = part->GetPdgCode();
2d677e30 636 Int_t ksp = part->GetUniqueID();
637 if (kf == 22 && ksp == 40) {
36b81802 638 Float_t phi = part->Phi();
639 Float_t eta = part->Eta();
640 if (eta < fEtaMaxJet &&
641 eta > fEtaMinJet &&
642 phi < fPhiMaxJet &&
643 phi > fPhiMinJet) {
644 triggered = 1;
645 break;
646 } // check phi,eta within limits
647 } // direct gamma ?
648 } // particle loop
649 } // fTrigger == 2
650 return triggered;
651}