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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
16/* $Id$ */
17
18//
19// Generator using the TPythia interface (via AliPythia)
20// to generate pp collisions.
21// Using SetNuclei() also nuclear modifications to the structure functions
22// can be taken into account. This makes, of course, only sense for the
23// generation of the products of hard processes (heavy flavor, jets ...)
24//
25// andreas.morsch@cern.ch
26//
27
28#include <TDatabasePDG.h>
29#include <TParticle.h>
30#include <TPDGCode.h>
31#include <TSystem.h>
32#include <TTree.h>
33
34#include "AliConst.h"
35#include "AliDecayerPythia.h"
36#include "AliGenPythia.h"
37#include "AliHeader.h"
38#include "AliGenPythiaEventHeader.h"
39#include "AliPythia.h"
40#include "AliPythiaRndm.h"
41#include "AliRun.h"
42#include "AliStack.h"
43#include "AliRunLoader.h"
44#include "AliMC.h"
45
46ClassImp(AliGenPythia)
47
48AliGenPythia::AliGenPythia()
49 :AliGenMC()
50{
51// Default Constructor
52 fParticles = 0;
53 fPythia = 0;
54 fHeader = 0;
55 fReadFromFile = 0;
56 fDecayer = new AliDecayerPythia();
57 SetEventListRange();
58 SetJetPhiRange();
59 SetJetEtaRange();
60 SetJetEtRange();
61 SetGammaPhiRange();
62 SetGammaEtaRange();
63 SetPtKick();
64 SetQuench();
65 SetHadronisation();
66 fSetNuclei = kFALSE;
67 if (!AliPythiaRndm::GetPythiaRandom())
68 AliPythiaRndm::SetPythiaRandom(GetRandom());
69}
70
71AliGenPythia::AliGenPythia(Int_t npart)
72 :AliGenMC(npart)
73{
74// default charm production at 5. 5 TeV
75// semimuonic decay
76// structure function GRVHO
77//
78 fName = "Pythia";
79 fTitle= "Particle Generator using PYTHIA";
80 fXsection = 0.;
81 fReadFromFile = 0;
82 SetProcess();
83 SetStrucFunc();
84 SetForceDecay();
85 SetPtHard();
86 SetYHard();
87 SetEnergyCMS();
88 fDecayer = new AliDecayerPythia();
89 // Set random number generator
90 if (!AliPythiaRndm::GetPythiaRandom())
91 AliPythiaRndm::SetPythiaRandom(GetRandom());
92 fFlavorSelect = 0;
93 // Produced particles
94 fParticles = new TClonesArray("TParticle",1000);
95 fHeader = 0;
96 SetEventListRange();
97 SetJetPhiRange();
98 SetJetEtaRange();
99 SetJetEtRange();
100 SetGammaPhiRange();
101 SetGammaEtaRange();
102 SetJetReconstructionMode();
103 SetQuench();
104 SetHadronisation();
105 SetPtKick();
106 // Options determining what to keep in the stack (Heavy flavour generation)
107 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
108 fFeedDownOpt = kTRUE; // allow feed down from higher family
109 // Fragmentation on/off
110 fFragmentation = kTRUE;
111 // Default counting mode
112 fCountMode = kCountAll;
113 // Pycel
114 SetPycellParameters();
115 fSetNuclei = kFALSE;
116}
117
118AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
119 :AliGenMC(Pythia)
120{
121// copy constructor
122 Pythia.Copy(*this);
123}
124
125AliGenPythia::~AliGenPythia()
126{
127// Destructor
128}
129
130void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
131 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
132{
133// Set pycell parameters
134 fPycellEtaMax = etamax;
135 fPycellNEta = neta;
136 fPycellNPhi = nphi;
137 fPycellThreshold = thresh;
138 fPycellEtSeed = etseed;
139 fPycellMinEtJet = minet;
140 fPycellMaxRadius = r;
141}
142
143
144
145void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
146{
147 // Set a range of event numbers, for which a table
148 // of generated particle will be printed
149 fDebugEventFirst = eventFirst;
150 fDebugEventLast = eventLast;
151 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
152}
153
154void AliGenPythia::Init()
155{
156// Initialisation
157
158 SetMC(AliPythia::Instance());
159 fPythia=(AliPythia*) fMCEvGen;
160
161//
162 fParentWeight=1./Float_t(fNpart);
163//
164// Forward Paramters to the AliPythia object
165 fDecayer->SetForceDecay(fForceDecay);
166 fDecayer->Init();
167
168
169 fPythia->SetCKIN(3,fPtHardMin);
170 fPythia->SetCKIN(4,fPtHardMax);
171 fPythia->SetCKIN(7,fYHardMin);
172 fPythia->SetCKIN(8,fYHardMax);
173
174 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
175 // Fragmentation?
176 if (fFragmentation) {
177 fPythia->SetMSTP(111,1);
178 } else {
179 fPythia->SetMSTP(111,0);
180 }
181
182
183// initial state radiation
184 fPythia->SetMSTP(61,fGinit);
185// final state radiation
186 fPythia->SetMSTP(71,fGfinal);
187// pt - kick
188 if (fPtKick > 0.) {
189 fPythia->SetMSTP(91,1);
190 fPythia->SetPARP(91,fPtKick);
191 } else {
192 fPythia->SetMSTP(91,0);
193 }
194
195
196 if (fReadFromFile) {
197 fRL = AliRunLoader::Open(fFileName, "Partons");
198 fRL->LoadKinematics();
199 fRL->LoadHeader();
200 } else {
201 fRL = 0x0;
202 }
203
204
205 //
206 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
207
208// Parent and Children Selection
209 switch (fProcess)
210 {
211 case kPyCharm:
212 case kPyCharmUnforced:
213 case kPyCharmPbPbMNR:
214 case kPyCharmppMNR:
215 case kPyCharmpPbMNR:
216 fParentSelect[0] = 411;
217 fParentSelect[1] = 421;
218 fParentSelect[2] = 431;
219 fParentSelect[3] = 4122;
220 fFlavorSelect = 4;
221 break;
222 case kPyD0PbPbMNR:
223 case kPyD0pPbMNR:
224 case kPyD0ppMNR:
225 fParentSelect[0] = 421;
226 fFlavorSelect = 4;
227 break;
228 case kPyDPlusPbPbMNR:
229 case kPyDPluspPbMNR:
230 case kPyDPlusppMNR:
231 fParentSelect[0] = 411;
232 fFlavorSelect = 4;
233 break;
234 case kPyBeauty:
235 case kPyBeautyPbPbMNR:
236 case kPyBeautypPbMNR:
237 case kPyBeautyppMNR:
238 fParentSelect[0]= 511;
239 fParentSelect[1]= 521;
240 fParentSelect[2]= 531;
241 fParentSelect[3]= 5122;
242 fParentSelect[4]= 5132;
243 fParentSelect[5]= 5232;
244 fParentSelect[6]= 5332;
245 fFlavorSelect = 5;
246 break;
247 case kPyBeautyUnforced:
248 fParentSelect[0] = 511;
249 fParentSelect[1] = 521;
250 fParentSelect[2] = 531;
251 fParentSelect[3] = 5122;
252 fParentSelect[4] = 5132;
253 fParentSelect[5] = 5232;
254 fParentSelect[6] = 5332;
255 fFlavorSelect = 5;
256 break;
257 case kPyJpsiChi:
258 case kPyJpsi:
259 fParentSelect[0] = 443;
260 break;
261 case kPyMb:
262 case kPyMbNonDiffr:
263 case kPyJets:
264 case kPyDirectGamma:
265 break;
266 case kPyW:
267 break;
268 }
269//
270//
271// JetFinder for Trigger
272//
273// Configure detector (EMCAL like)
274//
275 fPythia->SetPARU(51, fPycellEtaMax);
276 fPythia->SetMSTU(51, fPycellNEta);
277 fPythia->SetMSTU(52, fPycellNPhi);
278//
279// Configure Jet Finder
280//
281 fPythia->SetPARU(58, fPycellThreshold);
282 fPythia->SetPARU(52, fPycellEtSeed);
283 fPythia->SetPARU(53, fPycellMinEtJet);
284 fPythia->SetPARU(54, fPycellMaxRadius);
285 fPythia->SetMSTU(54, 2);
286//
287// This counts the total number of calls to Pyevnt() per run.
288 fTrialsRun = 0;
289 fQ = 0.;
290 fX1 = 0.;
291 fX2 = 0.;
292 fNev = 0 ;
293//
294//
295//
296 AliGenMC::Init();
297//
298//
299//
300 if (fSetNuclei) {
301 fDyBoost = 0;
302 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
303 }
304
305 if (fQuench) {
306 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
307 }
308
309}
310
311void AliGenPythia::Generate()
312{
313// Generate one event
314
315 fDecayer->ForceDecay();
316
317 Float_t polar[3] = {0,0,0};
318 Float_t origin[3] = {0,0,0};
319 Float_t p[4];
320// converts from mm/c to s
321 const Float_t kconv=0.001/2.999792458e8;
322//
323 Int_t nt=0;
324 Int_t jev=0;
325 Int_t j, kf;
326 fTrials=0;
327
328
329 // Set collision vertex position
330 if (fVertexSmear == kPerEvent) Vertex();
331
332// event loop
333 while(1)
334 {
335//
336// Produce event
337//
338//
339// Switch hadronisation off
340//
341 fPythia->SetMSTJ(1, 0);
342//
343// Either produce new event or read partons from file
344//
345 if (!fReadFromFile) {
346 fPythia->Pyevnt();
347 fNpartons = fPythia->GetN();
348 } else {
349 printf("Loading Event %d\n",AliRunLoader::GetRunLoader()->GetEventNumber());
350 fRL->GetEvent(AliRunLoader::GetRunLoader()->GetEventNumber());
351 fPythia->SetN(0);
352 LoadEvent(fRL->Stack(), 0 , 1);
353 fPythia->Pyedit(21);
354 }
355
356//
357// Run quenching routine
358//
359 if (fQuench == 1) {
360 fPythia->Quench();
361 } else if (fQuench == 2){
362 fPythia->Pyquen(208., 0, 0.);
363 }
364//
365// Switch hadronisation on
366//
367 fPythia->SetMSTJ(1, 1);
368//
369// .. and perform hadronisation
370// printf("Calling hadronisation %d\n", fPythia->GetN());
371 fPythia->Pyexec();
372 fTrials++;
373 fPythia->ImportParticles(fParticles,"All");
374 Boost();
375//
376//
377//
378 Int_t i;
379
380
381 Int_t np = fParticles->GetEntriesFast();
382
383 if (np == 0 ) continue;
384//
385
386//
387 Int_t* pParent = new Int_t[np];
388 Int_t* pSelected = new Int_t[np];
389 Int_t* trackIt = new Int_t[np];
390 for (i = 0; i < np; i++) {
391 pParent[i] = -1;
392 pSelected[i] = 0;
393 trackIt[i] = 0;
394 }
395
396 Int_t nc = 0; // Total n. of selected particles
397 Int_t nParents = 0; // Selected parents
398 Int_t nTkbles = 0; // Trackable particles
399 if (fProcess != kPyMb && fProcess != kPyJets &&
400 fProcess != kPyDirectGamma &&
401 fProcess != kPyMbNonDiffr &&
402 fProcess != kPyW) {
403
404 for (i = 0; i < np; i++) {
405 TParticle* iparticle = (TParticle *) fParticles->At(i);
406 Int_t ks = iparticle->GetStatusCode();
407 kf = CheckPDGCode(iparticle->GetPdgCode());
408// No initial state partons
409 if (ks==21) continue;
410//
411// Heavy Flavor Selection
412//
413 // quark ?
414 kf = TMath::Abs(kf);
415 Int_t kfl = kf;
416 // Resonance
417 if (kfl > 100000) kfl %= 100000;
418 // meson ?
419 if (kfl > 10) kfl/=100;
420 // baryon
421 if (kfl > 10) kfl/=10;
422 Int_t ipa = iparticle->GetFirstMother()-1;
423 Int_t kfMo = 0;
424
425 if (ipa > -1) {
426 TParticle * mother = (TParticle *) fParticles->At(ipa);
427 kfMo = TMath::Abs(mother->GetPdgCode());
428 }
429 // What to keep in Stack?
430 Bool_t flavorOK = kFALSE;
431 Bool_t selectOK = kFALSE;
432 if (fFeedDownOpt) {
433 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
434 } else {
435 if (kfl > fFlavorSelect) {
436 nc = -1;
437 break;
438 }
439 if (kfl == fFlavorSelect) flavorOK = kTRUE;
440 }
441 switch (fStackFillOpt) {
442 case kFlavorSelection:
443 selectOK = kTRUE;
444 break;
445 case kParentSelection:
446 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
447 break;
448 }
449 if (flavorOK && selectOK) {
450//
451// Heavy flavor hadron or quark
452//
453// Kinematic seletion on final state heavy flavor mesons
454 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
455 {
456 continue;
457 }
458 pSelected[i] = 1;
459 if (ParentSelected(kf)) ++nParents; // Update parent count
460// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
461 } else {
462// Kinematic seletion on decay products
463 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
464 && !KinematicSelection(iparticle, 1))
465 {
466 continue;
467 }
468//
469// Decay products
470// Select if mother was selected and is not tracked
471
472 if (pSelected[ipa] &&
473 !trackIt[ipa] && // mother will be tracked ?
474 kfMo != 5 && // mother is b-quark, don't store fragments
475 kfMo != 4 && // mother is c-quark, don't store fragments
476 kf != 92) // don't store string
477 {
478//
479// Semi-stable or de-selected: diselect decay products:
480//
481//
482 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
483 {
484 Int_t ipF = iparticle->GetFirstDaughter();
485 Int_t ipL = iparticle->GetLastDaughter();
486 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
487 }
488// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
489 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
490 }
491 }
492 if (pSelected[i] == -1) pSelected[i] = 0;
493 if (!pSelected[i]) continue;
494 // Count quarks only if you did not include fragmentation
495 if (fFragmentation && kf <= 10) continue;
496
497 nc++;
498// Decision on tracking
499 trackIt[i] = 0;
500//
501// Track final state particle
502 if (ks == 1) trackIt[i] = 1;
503// Track semi-stable particles
504 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
505// Track particles selected by process if undecayed.
506 if (fForceDecay == kNoDecay) {
507 if (ParentSelected(kf)) trackIt[i] = 1;
508 } else {
509 if (ParentSelected(kf)) trackIt[i] = 0;
510 }
511 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
512//
513//
514
515 } // particle selection loop
516 if (nc > 0) {
517 for (i = 0; i<np; i++) {
518 if (!pSelected[i]) continue;
519 TParticle * iparticle = (TParticle *) fParticles->At(i);
520 kf = CheckPDGCode(iparticle->GetPdgCode());
521 Int_t ks = iparticle->GetStatusCode();
522 p[0] = iparticle->Px();
523 p[1] = iparticle->Py();
524 p[2] = iparticle->Pz();
525 p[3] = iparticle->Energy();
526
527 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
528 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
529 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
530
531 Float_t tof = kconv*iparticle->T();
532 Int_t ipa = iparticle->GetFirstMother()-1;
533 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
534
535 PushTrack(fTrackIt*trackIt[i], iparent, kf,
536 p[0], p[1], p[2], p[3],
537 origin[0], origin[1], origin[2], tof,
538 polar[0], polar[1], polar[2],
539 kPPrimary, nt, 1., ks);
540 pParent[i] = nt;
541 KeepTrack(nt);
542 } // PushTrack loop
543 }
544 } else {
545 nc = GenerateMB();
546 } // mb ?
547
548 if (pParent) delete[] pParent;
549 if (pSelected) delete[] pSelected;
550 if (trackIt) delete[] trackIt;
551
552 if (nc > 0) {
553 switch (fCountMode) {
554 case kCountAll:
555 // printf(" Count all \n");
556 jev += nc;
557 break;
558 case kCountParents:
559 // printf(" Count parents \n");
560 jev += nParents;
561 break;
562 case kCountTrackables:
563 // printf(" Count trackable \n");
564 jev += nTkbles;
565 break;
566 }
567 if (jev >= fNpart || fNpart == -1) {
568 fKineBias=Float_t(fNpart)/Float_t(fTrials);
569 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
570
571 fQ += fPythia->GetVINT(51);
572 fX1 += fPythia->GetVINT(41);
573 fX2 += fPythia->GetVINT(42);
574 fTrialsRun += fTrials;
575 fNev++;
576 MakeHeader();
577 break;
578 }
579 }
580 } // event loop
581 SetHighWaterMark(nt);
582// adjust weight due to kinematic selection
583// AdjustWeights();
584// get cross-section
585 fXsection=fPythia->GetPARI(1);
586}
587
588Int_t AliGenPythia::GenerateMB()
589{
590//
591// Min Bias selection and other global selections
592//
593 Int_t i, kf, nt, iparent;
594 Int_t nc = 0;
595 Float_t p[4];
596 Float_t polar[3] = {0,0,0};
597 Float_t origin[3] = {0,0,0};
598// converts from mm/c to s
599 const Float_t kconv=0.001/2.999792458e8;
600
601
602
603 Int_t np = (fHadronisation) ? fParticles->GetEntriesFast() : fNpartons;
604
605
606 Int_t* pParent = new Int_t[np];
607 for (i=0; i< np; i++) pParent[i] = -1;
608 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
609 TParticle* jet1 = (TParticle *) fParticles->At(6);
610 TParticle* jet2 = (TParticle *) fParticles->At(7);
611 if (!CheckTrigger(jet1, jet2)) return 0;
612 }
613
614 for (i = 0; i<np; i++) {
615 Int_t trackIt = 0;
616 TParticle * iparticle = (TParticle *) fParticles->At(i);
617 kf = CheckPDGCode(iparticle->GetPdgCode());
618 Int_t ks = iparticle->GetStatusCode();
619 Int_t km = iparticle->GetFirstMother();
620 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
621 (ks != 1) ||
622 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
623 nc++;
624 if (ks == 1) trackIt = 1;
625 Int_t ipa = iparticle->GetFirstMother()-1;
626
627 iparent = (ipa > -1) ? pParent[ipa] : -1;
628
629//
630// store track information
631 p[0] = iparticle->Px();
632 p[1] = iparticle->Py();
633 p[2] = iparticle->Pz();
634 p[3] = iparticle->Energy();
635
636
637 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
638 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
639 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
640
641 Float_t tof=kconv*iparticle->T();
642
643 PushTrack(fTrackIt*trackIt, iparent, kf,
644 p[0], p[1], p[2], p[3],
645 origin[0], origin[1], origin[2], tof,
646 polar[0], polar[1], polar[2],
647 kPPrimary, nt, 1., ks);
648 //
649 // Special Treatment to store color-flow
650 //
651 if (ks == 3 || ks == 13 || ks == 14) {
652 TParticle* particle = 0;
653 if (fStack) {
654 particle = fStack->Particle(nt);
655 } else {
656 particle = gAlice->Stack()->Particle(nt);
657 }
658 particle->SetFirstDaughter(fPythia->GetK(2, i));
659 particle->SetLastDaughter(fPythia->GetK(3, i));
660 }
661
662 KeepTrack(nt);
663 pParent[i] = nt;
664 } // select particle
665 } // particle loop
666
667 if (pParent) delete[] pParent;
668
669 printf("\n I've put %i particles on the stack \n",nc);
670 return nc;
671}
672
673
674void AliGenPythia::FinishRun()
675{
676// Print x-section summary
677 fPythia->Pystat(1);
678
679 if (fNev > 0.) {
680 fQ /= fNev;
681 fX1 /= fNev;
682 fX2 /= fNev;
683 }
684
685 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
686 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
687}
688
689void AliGenPythia::AdjustWeights()
690{
691// Adjust the weights after generation of all events
692//
693 if (gAlice) {
694 TParticle *part;
695 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
696 for (Int_t i=0; i<ntrack; i++) {
697 part= gAlice->GetMCApp()->Particle(i);
698 part->SetWeight(part->GetWeight()*fKineBias);
699 }
700 }
701}
702
703void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
704{
705// Treat protons as inside nuclei with mass numbers a1 and a2
706
707 fAProjectile = a1;
708 fATarget = a2;
709 fSetNuclei = kTRUE;
710}
711
712
713void AliGenPythia::MakeHeader()
714{
715// Builds the event header, to be called after each event
716 if (fHeader) delete fHeader;
717 fHeader = new AliGenPythiaEventHeader("Pythia");
718//
719// Event type
720 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
721//
722// Number of trials
723 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
724//
725// Event Vertex
726 fHeader->SetPrimaryVertex(fVertex);
727//
728// Jets that have triggered
729 if (fProcess == kPyJets)
730 {
731 Int_t ntrig, njet;
732 Float_t jets[4][10];
733 GetJets(njet, ntrig, jets);
734
735 if (gAlice) {
736 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
737 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
738 }
739
740 for (Int_t i = 0; i < ntrig; i++) {
741 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
742 jets[3][i]);
743 }
744 }
745//
746// Copy relevant information from external header, if present.
747//
748 Float_t uqJet[4];
749
750 if (fRL) {
751 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
752 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
753 {
754 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
755
756
757 exHeader->TriggerJet(i, uqJet);
758 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
759 }
760 }
761//
762// Store quenching parameters
763//
764 if (fQuench){
765 Double_t z[4];
766 Double_t xp, yp;
767
768 fPythia->GetQuenchingParameters(xp, yp, z);
769
770 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
771 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
772 }
773
774//
775// Pass header to RunLoader
776//
777 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(fHeader);
778}
779
780
781Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
782{
783// Check the kinematic trigger condition
784//
785 Double_t eta[2];
786 eta[0] = jet1->Eta();
787 eta[1] = jet2->Eta();
788 Double_t phi[2];
789 phi[0] = jet1->Phi();
790 phi[1] = jet2->Phi();
791 Int_t pdg[2];
792 pdg[0] = jet1->GetPdgCode();
793 pdg[1] = jet2->GetPdgCode();
794 Bool_t triggered = kFALSE;
795
796 if (fProcess == kPyJets) {
797 Int_t njets = 0;
798 Int_t ntrig = 0;
799 Float_t jets[4][10];
800//
801// Use Pythia clustering on parton level to determine jet axis
802//
803 GetJets(njets, ntrig, jets);
804
805 if (ntrig) triggered = kTRUE;
806//
807 } else {
808 Int_t ij = 0;
809 Int_t ig = 1;
810 if (pdg[0] == kGamma) {
811 ij = 1;
812 ig = 0;
813 }
814 //Check eta range first...
815 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
816 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
817 {
818 //Eta is okay, now check phi range
819 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
820 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
821 {
822 triggered = kTRUE;
823 }
824 }
825 }
826 return triggered;
827}
828
829AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
830{
831// Assignment operator
832 rhs.Copy(*this);
833 return *this;
834}
835
836void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
837{
838//
839// Load event into Pythia Common Block
840//
841
842 Int_t npart = stack -> GetNprimary();
843 Int_t n0 = 0;
844
845 if (!flag) {
846 (fPythia->GetPyjets())->N = npart;
847 } else {
848 n0 = (fPythia->GetPyjets())->N;
849 (fPythia->GetPyjets())->N = n0 + npart;
850 }
851
852
853 for (Int_t part = 0; part < npart; part++) {
854 TParticle *MPart = stack->Particle(part);
855
856 Int_t kf = MPart->GetPdgCode();
857 Int_t ks = MPart->GetStatusCode();
858 Int_t idf = MPart->GetFirstDaughter();
859 Int_t idl = MPart->GetLastDaughter();
860
861 if (reHadr) {
862 if (ks == 11 || ks == 12) {
863 ks -= 10;
864 idf = -1;
865 idl = -1;
866 }
867 }
868
869 Float_t px = MPart->Px();
870 Float_t py = MPart->Py();
871 Float_t pz = MPart->Pz();
872 Float_t e = MPart->Energy();
873 Float_t m = MPart->GetCalcMass();
874
875
876 (fPythia->GetPyjets())->P[0][part+n0] = px;
877 (fPythia->GetPyjets())->P[1][part+n0] = py;
878 (fPythia->GetPyjets())->P[2][part+n0] = pz;
879 (fPythia->GetPyjets())->P[3][part+n0] = e;
880 (fPythia->GetPyjets())->P[4][part+n0] = m;
881
882 (fPythia->GetPyjets())->K[1][part+n0] = kf;
883 (fPythia->GetPyjets())->K[0][part+n0] = ks;
884 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
885 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
886 (fPythia->GetPyjets())->K[2][part+n0] = MPart->GetFirstMother() + 1;
887 }
888}
889
890
891void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
892{
893//
894// Calls the Pythia jet finding algorithm to find jets in the current event
895//
896//
897//
898// Save jets
899 Int_t n = fPythia->GetN();
900
901//
902// Run Jet Finder
903 fPythia->Pycell(njets);
904 Int_t i;
905 for (i = 0; i < njets; i++) {
906 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
907 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
908 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
909 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
910
911 jets[0][i] = px;
912 jets[1][i] = py;
913 jets[2][i] = pz;
914 jets[3][i] = e;
915 }
916}
917
918
919
920void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
921{
922//
923// Calls the Pythia clustering algorithm to find jets in the current event
924//
925 Int_t n = fPythia->GetN();
926 nJets = 0;
927 nJetsTrig = 0;
928 if (fJetReconstruction == kCluster) {
929//
930// Configure cluster algorithm
931//
932 fPythia->SetPARU(43, 2.);
933 fPythia->SetMSTU(41, 1);
934//
935// Call cluster algorithm
936//
937 fPythia->Pyclus(nJets);
938//
939// Loading jets from common block
940//
941 } else {
942
943//
944// Run Jet Finder
945 fPythia->Pycell(nJets);
946 }
947
948 Int_t i;
949 for (i = 0; i < nJets; i++) {
950 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
951 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
952 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
953 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
954 Float_t pt = TMath::Sqrt(px * px + py * py);
955 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
956 Float_t theta = TMath::ATan2(pt,pz);
957 Float_t et = e * TMath::Sin(theta);
958 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
959 if (
960 eta > fEtaMinJet && eta < fEtaMaxJet &&
961 phi > fPhiMinJet && phi < fPhiMaxJet &&
962 et > fEtMinJet && et < fEtMaxJet
963 )
964 {
965 jets[0][nJetsTrig] = px;
966 jets[1][nJetsTrig] = py;
967 jets[2][nJetsTrig] = pz;
968 jets[3][nJetsTrig] = e;
969 nJetsTrig++;
970// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
971 } else {
972// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
973 }
974 }
975}
976
977
978#ifdef never
979void AliGenPythia::Streamer(TBuffer &R__b)
980{
981 // Stream an object of class AliGenPythia.
982
983 if (R__b.IsReading()) {
984 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
985 AliGenerator::Streamer(R__b);
986 R__b >> (Int_t&)fProcess;
987 R__b >> (Int_t&)fStrucFunc;
988 R__b >> (Int_t&)fForceDecay;
989 R__b >> fEnergyCMS;
990 R__b >> fKineBias;
991 R__b >> fTrials;
992 fParentSelect.Streamer(R__b);
993 fChildSelect.Streamer(R__b);
994 R__b >> fXsection;
995// (AliPythia::Instance())->Streamer(R__b);
996 R__b >> fPtHardMin;
997 R__b >> fPtHardMax;
998// if (fDecayer) fDecayer->Streamer(R__b);
999 } else {
1000 R__b.WriteVersion(AliGenPythia::IsA());
1001 AliGenerator::Streamer(R__b);
1002 R__b << (Int_t)fProcess;
1003 R__b << (Int_t)fStrucFunc;
1004 R__b << (Int_t)fForceDecay;
1005 R__b << fEnergyCMS;
1006 R__b << fKineBias;
1007 R__b << fTrials;
1008 fParentSelect.Streamer(R__b);
1009 fChildSelect.Streamer(R__b);
1010 R__b << fXsection;
1011// R__b << fPythia;
1012 R__b << fPtHardMin;
1013 R__b << fPtHardMax;
1014 // fDecayer->Streamer(R__b);
1015 }
1016}
1017#endif
1018
1019
1020