- LoadEvent with stack as argument.
[u/mrichter/AliRoot.git] / PYTHIA6 / AliGenPythia.cxx
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8d2cd130 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/* $Id$ */
8d2cd130 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 "AliGenPythiaEventHeader.h"
38#include "AliPythia.h"
7cdba479 39#include "AliPythiaRndm.h"
8d2cd130 40#include "AliRun.h"
7ea3ea5b 41#include "AliStack.h"
42#include "AliRunLoader.h"
5d12ce38 43#include "AliMC.h"
8d2cd130 44
014a9521 45ClassImp(AliGenPythia)
8d2cd130 46
47AliGenPythia::AliGenPythia()
48 :AliGenMC()
49{
50// Default Constructor
51 fParticles = 0;
52 fPythia = 0;
e5c87a3d 53 fHeader = 0;
8d2cd130 54 fDecayer = new AliDecayerPythia();
55 SetEventListRange();
56 SetJetPhiRange();
57 SetJetEtaRange();
58 SetJetEtRange();
59 SetGammaPhiRange();
60 SetGammaEtaRange();
61 SetPtKick();
7ea3ea5b 62 SetQuench();
63
1d568bc2 64 fSetNuclei = kFALSE;
7cdba479 65 if (!AliPythiaRndm::GetPythiaRandom())
66 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 67}
68
69AliGenPythia::AliGenPythia(Int_t npart)
70 :AliGenMC(npart)
71{
72// default charm production at 5. 5 TeV
73// semimuonic decay
74// structure function GRVHO
75//
76 fName = "Pythia";
77 fTitle= "Particle Generator using PYTHIA";
78 fXsection = 0.;
8d2cd130 79 SetProcess();
80 SetStrucFunc();
81 SetForceDecay();
82 SetPtHard();
83 SetYHard();
84 SetEnergyCMS();
85 fDecayer = new AliDecayerPythia();
86 // Set random number generator
7cdba479 87 if (!AliPythiaRndm::GetPythiaRandom())
88 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 89 fFlavorSelect = 0;
90 // Produced particles
91 fParticles = new TClonesArray("TParticle",1000);
e5c87a3d 92 fHeader = 0;
8d2cd130 93 SetEventListRange();
94 SetJetPhiRange();
95 SetJetEtaRange();
96 SetJetEtRange();
97 SetGammaPhiRange();
98 SetGammaEtaRange();
99 SetJetReconstructionMode();
7ea3ea5b 100 SetQuench();
8d2cd130 101 SetPtKick();
102 // Options determining what to keep in the stack (Heavy flavour generation)
103 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
104 fFeedDownOpt = kTRUE; // allow feed down from higher family
105 // Fragmentation on/off
106 fFragmentation = kTRUE;
107 // Default counting mode
108 fCountMode = kCountAll;
592f8307 109 // Pycel
110 SetPycellParameters();
1d568bc2 111 fSetNuclei = kFALSE;
8d2cd130 112}
113
114AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
f936b8ea 115 :AliGenMC(Pythia)
8d2cd130 116{
117// copy constructor
118 Pythia.Copy(*this);
119}
120
121AliGenPythia::~AliGenPythia()
122{
123// Destructor
124}
125
592f8307 126void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
127 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
128{
129// Set pycell parameters
130 fPycellEtaMax = etamax;
131 fPycellNEta = neta;
132 fPycellNPhi = nphi;
133 fPycellThreshold = thresh;
134 fPycellEtSeed = etseed;
135 fPycellMinEtJet = minet;
136 fPycellMaxRadius = r;
137}
138
139
140
8d2cd130 141void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
142{
143 // Set a range of event numbers, for which a table
144 // of generated particle will be printed
145 fDebugEventFirst = eventFirst;
146 fDebugEventLast = eventLast;
147 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
148}
149
150void AliGenPythia::Init()
151{
152// Initialisation
153
154 SetMC(AliPythia::Instance());
b88f5cea 155 fPythia=(AliPythia*) fMCEvGen;
e2bddf81 156
8d2cd130 157//
158 fParentWeight=1./Float_t(fNpart);
159//
160// Forward Paramters to the AliPythia object
161 fDecayer->SetForceDecay(fForceDecay);
162 fDecayer->Init();
163
164
165 fPythia->SetCKIN(3,fPtHardMin);
166 fPythia->SetCKIN(4,fPtHardMax);
167 fPythia->SetCKIN(7,fYHardMin);
168 fPythia->SetCKIN(8,fYHardMax);
169
1a626d4e 170 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
8d2cd130 171 // Fragmentation?
172 if (fFragmentation) {
173 fPythia->SetMSTP(111,1);
174 } else {
175 fPythia->SetMSTP(111,0);
176 }
177
178
179// initial state radiation
180 fPythia->SetMSTP(61,fGinit);
181// final state radiation
182 fPythia->SetMSTP(71,fGfinal);
183// pt - kick
184 if (fPtKick > 0.) {
185 fPythia->SetMSTP(91,1);
186 fPythia->SetPARP(91,fPtKick);
187 } else {
188 fPythia->SetMSTP(91,0);
189 }
190
191 // fPythia->SetMSTJ(1,2);
192 //
193 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
194
195// Parent and Children Selection
196 switch (fProcess)
197 {
198 case kPyCharm:
199 case kPyCharmUnforced:
adf4d898 200 case kPyCharmPbPbMNR:
aabc7187 201 case kPyCharmppMNR:
202 case kPyCharmpPbMNR:
8d2cd130 203 fParentSelect[0] = 411;
204 fParentSelect[1] = 421;
205 fParentSelect[2] = 431;
206 fParentSelect[3] = 4122;
207 fFlavorSelect = 4;
208 break;
adf4d898 209 case kPyD0PbPbMNR:
210 case kPyD0pPbMNR:
211 case kPyD0ppMNR:
8d2cd130 212 fParentSelect[0] = 421;
213 fFlavorSelect = 4;
214 break;
215 case kPyBeauty:
adf4d898 216 case kPyBeautyPbPbMNR:
217 case kPyBeautypPbMNR:
218 case kPyBeautyppMNR:
8d2cd130 219 fParentSelect[0]= 511;
220 fParentSelect[1]= 521;
221 fParentSelect[2]= 531;
222 fParentSelect[3]= 5122;
223 fParentSelect[4]= 5132;
224 fParentSelect[5]= 5232;
225 fParentSelect[6]= 5332;
226 fFlavorSelect = 5;
227 break;
228 case kPyBeautyUnforced:
229 fParentSelect[0] = 511;
230 fParentSelect[1] = 521;
231 fParentSelect[2] = 531;
232 fParentSelect[3] = 5122;
233 fParentSelect[4] = 5132;
234 fParentSelect[5] = 5232;
235 fParentSelect[6] = 5332;
236 fFlavorSelect = 5;
237 break;
238 case kPyJpsiChi:
239 case kPyJpsi:
240 fParentSelect[0] = 443;
241 break;
242 case kPyMb:
243 case kPyMbNonDiffr:
244 case kPyJets:
245 case kPyDirectGamma:
246 break;
247 }
248//
592f8307 249//
250// JetFinder for Trigger
251//
252// Configure detector (EMCAL like)
253//
254 fPythia->SetPARU(51, fPycellEtaMax);
255 fPythia->SetMSTU(51, fPycellNEta);
256 fPythia->SetMSTU(52, fPycellNPhi);
257//
258// Configure Jet Finder
259//
260 fPythia->SetPARU(58, fPycellThreshold);
261 fPythia->SetPARU(52, fPycellEtSeed);
262 fPythia->SetPARU(53, fPycellMinEtJet);
263 fPythia->SetPARU(54, fPycellMaxRadius);
264 fPythia->SetMSTU(54, 2);
265//
8d2cd130 266// This counts the total number of calls to Pyevnt() per run.
267 fTrialsRun = 0;
268 fQ = 0.;
269 fX1 = 0.;
270 fX2 = 0.;
271 fNev = 0 ;
272//
1d568bc2 273//
274//
8d2cd130 275 AliGenMC::Init();
1d568bc2 276//
277//
278//
279 if (fSetNuclei) {
280 fDyBoost = 0;
281 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
282 }
32d6ef7d 283
284 if (fQuench) {
285 fPythia->InitQuenching(0., 0.1, 1., 8., 0);
286 }
287
8d2cd130 288}
289
290void AliGenPythia::Generate()
291{
292// Generate one event
e5c87a3d 293
8d2cd130 294 fDecayer->ForceDecay();
295
296 Float_t polar[3] = {0,0,0};
297 Float_t origin[3] = {0,0,0};
a920faf9 298 Float_t p[4];
8d2cd130 299// converts from mm/c to s
300 const Float_t kconv=0.001/2.999792458e8;
301//
302 Int_t nt=0;
303 Int_t jev=0;
304 Int_t j, kf;
305 fTrials=0;
2590ccf9 306
8d2cd130 307
308 // Set collision vertex position
2590ccf9 309 if (fVertexSmear == kPerEvent) Vertex();
310
8d2cd130 311// event loop
312 while(1)
313 {
32d6ef7d 314//
315// If quenching option has been selected switch off fragmentation first
316//
7ea3ea5b 317 if (fQuench) {
318 fPythia->SetMSTJ(1, 0);
319 }
32d6ef7d 320//
321// Produce event
322//
8d2cd130 323 fPythia->Pyevnt();
7ea3ea5b 324 if (fQuench) {
32d6ef7d 325//
326// Run quenching routine
327//
7ea3ea5b 328 fPythia->Quench();
32d6ef7d 329//
330// Switch fragmentation on
7ea3ea5b 331 fPythia->SetMSTJ(1, 1);
32d6ef7d 332//
333// .. and perform fragmentation
7ea3ea5b 334 fPythia->Pyexec();
32d6ef7d 335
7ea3ea5b 336 }
337
e2bddf81 338 if (gAlice) {
339 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
340 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
341 }
7ea3ea5b 342
8d2cd130 343 fTrials++;
8d2cd130 344 fPythia->ImportParticles(fParticles,"All");
1d568bc2 345 Boost();
8d2cd130 346//
347//
348//
349 Int_t i;
350
351 Int_t np = fParticles->GetEntriesFast();
352 if (np == 0 ) continue;
8d2cd130 353//
2590ccf9 354
8d2cd130 355//
356 Int_t* pParent = new Int_t[np];
357 Int_t* pSelected = new Int_t[np];
358 Int_t* trackIt = new Int_t[np];
359 for (i=0; i< np; i++) {
360 pParent[i] = -1;
361 pSelected[i] = 0;
362 trackIt[i] = 0;
363 }
364
365 Int_t nc = 0; // Total n. of selected particles
366 Int_t nParents = 0; // Selected parents
367 Int_t nTkbles = 0; // Trackable particles
368 if (fProcess != kPyMb && fProcess != kPyJets &&
369 fProcess != kPyDirectGamma &&
370 fProcess != kPyMbNonDiffr) {
371
372 for (i = 0; i<np; i++) {
2590ccf9 373 TParticle* iparticle = (TParticle *) fParticles->At(i);
8d2cd130 374 Int_t ks = iparticle->GetStatusCode();
375 kf = CheckPDGCode(iparticle->GetPdgCode());
376// No initial state partons
377 if (ks==21) continue;
378//
379// Heavy Flavor Selection
380//
381 // quark ?
382 kf = TMath::Abs(kf);
383 Int_t kfl = kf;
384 // meson ?
385 if (kfl > 10) kfl/=100;
386 // baryon
387 if (kfl > 10) kfl/=10;
388 if (kfl > 10) kfl/=10;
389
390 Int_t ipa = iparticle->GetFirstMother()-1;
391 Int_t kfMo = 0;
392
393 if (ipa > -1) {
394 TParticle * mother = (TParticle *) fParticles->At(ipa);
395 kfMo = TMath::Abs(mother->GetPdgCode());
396 }
397 // What to keep in Stack?
398 Bool_t flavorOK = kFALSE;
399 Bool_t selectOK = kFALSE;
400 if (fFeedDownOpt) {
32d6ef7d 401 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
8d2cd130 402 } else {
32d6ef7d 403 if (kfl > fFlavorSelect) {
404 nc = -1;
405 break;
406 }
407 if (kfl == fFlavorSelect) flavorOK = kTRUE;
8d2cd130 408 }
409 switch (fStackFillOpt) {
410 case kFlavorSelection:
32d6ef7d 411 selectOK = kTRUE;
412 break;
8d2cd130 413 case kParentSelection:
32d6ef7d 414 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
415 break;
8d2cd130 416 }
417 if (flavorOK && selectOK) {
418//
419// Heavy flavor hadron or quark
420//
421// Kinematic seletion on final state heavy flavor mesons
422 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
423 {
424 continue;
425 }
426 pSelected[i] = 1;
427 if (ParentSelected(kf)) ++nParents; // Update parent count
428// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
429 } else {
430// Kinematic seletion on decay products
431 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
432 && !KinematicSelection(iparticle, 1))
433 {
434 continue;
435 }
436//
437// Decay products
438// Select if mother was selected and is not tracked
439
440 if (pSelected[ipa] &&
441 !trackIt[ipa] && // mother will be tracked ?
442 kfMo != 5 && // mother is b-quark, don't store fragments
443 kfMo != 4 && // mother is c-quark, don't store fragments
444 kf != 92) // don't store string
445 {
446//
447// Semi-stable or de-selected: diselect decay products:
448//
449//
450 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
451 {
452 Int_t ipF = iparticle->GetFirstDaughter();
453 Int_t ipL = iparticle->GetLastDaughter();
454 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
455 }
456// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
457 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
458 }
459 }
460 if (pSelected[i] == -1) pSelected[i] = 0;
461 if (!pSelected[i]) continue;
462 // Count quarks only if you did not include fragmentation
463 if (fFragmentation && kf <= 10) continue;
464 nc++;
465// Decision on tracking
466 trackIt[i] = 0;
467//
468// Track final state particle
469 if (ks == 1) trackIt[i] = 1;
470// Track semi-stable particles
d25cfd65 471 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 472// Track particles selected by process if undecayed.
473 if (fForceDecay == kNoDecay) {
474 if (ParentSelected(kf)) trackIt[i] = 1;
475 } else {
476 if (ParentSelected(kf)) trackIt[i] = 0;
477 }
478 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
479//
480//
481
482 } // particle selection loop
483 if (nc > 0) {
484 for (i = 0; i<np; i++) {
485 if (!pSelected[i]) continue;
486 TParticle * iparticle = (TParticle *) fParticles->At(i);
487 kf = CheckPDGCode(iparticle->GetPdgCode());
488 Int_t ks = iparticle->GetStatusCode();
489 p[0] = iparticle->Px();
490 p[1] = iparticle->Py();
491 p[2] = iparticle->Pz();
a920faf9 492 p[3] = iparticle->Energy();
493
2590ccf9 494 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
495 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
496 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
497
8d2cd130 498 Float_t tof = kconv*iparticle->T();
499 Int_t ipa = iparticle->GetFirstMother()-1;
500 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 501
502 PushTrack(fTrackIt*trackIt[i], iparent, kf,
503 p[0], p[1], p[2], p[3],
504 origin[0], origin[1], origin[2], tof,
505 polar[0], polar[1], polar[2],
506 kPPrimary, nt, 1., ks);
8d2cd130 507 pParent[i] = nt;
508 KeepTrack(nt);
642f15cf 509 } // PushTrack loop
8d2cd130 510 }
511 } else {
512 nc = GenerateMB();
513 } // mb ?
514
515 if (pParent) delete[] pParent;
516 if (pSelected) delete[] pSelected;
517 if (trackIt) delete[] trackIt;
518
519 if (nc > 0) {
520 switch (fCountMode) {
521 case kCountAll:
522 // printf(" Count all \n");
523 jev += nc;
524 break;
525 case kCountParents:
526 // printf(" Count parents \n");
527 jev += nParents;
528 break;
529 case kCountTrackables:
530 // printf(" Count trackable \n");
531 jev += nTkbles;
532 break;
533 }
534 if (jev >= fNpart || fNpart == -1) {
535 fKineBias=Float_t(fNpart)/Float_t(fTrials);
536 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
537
538 fQ += fPythia->GetVINT(51);
539 fX1 += fPythia->GetVINT(41);
540 fX2 += fPythia->GetVINT(42);
541 fTrialsRun += fTrials;
542 fNev++;
543 MakeHeader();
544 break;
545 }
546 }
547 } // event loop
548 SetHighWaterMark(nt);
549// adjust weight due to kinematic selection
b88f5cea 550// AdjustWeights();
8d2cd130 551// get cross-section
552 fXsection=fPythia->GetPARI(1);
553}
554
555Int_t AliGenPythia::GenerateMB()
556{
557//
558// Min Bias selection and other global selections
559//
560 Int_t i, kf, nt, iparent;
561 Int_t nc = 0;
bf950da8 562 Float_t p[4];
8d2cd130 563 Float_t polar[3] = {0,0,0};
564 Float_t origin[3] = {0,0,0};
565// converts from mm/c to s
566 const Float_t kconv=0.001/2.999792458e8;
567
568 Int_t np = fParticles->GetEntriesFast();
569 Int_t* pParent = new Int_t[np];
570 for (i=0; i< np; i++) pParent[i] = -1;
571 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
572 TParticle* jet1 = (TParticle *) fParticles->At(6);
573 TParticle* jet2 = (TParticle *) fParticles->At(7);
574 if (!CheckTrigger(jet1, jet2)) return 0;
575 }
576
577 for (i = 0; i<np; i++) {
578 Int_t trackIt = 0;
579 TParticle * iparticle = (TParticle *) fParticles->At(i);
580 kf = CheckPDGCode(iparticle->GetPdgCode());
581 Int_t ks = iparticle->GetStatusCode();
582 Int_t km = iparticle->GetFirstMother();
583 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
584 (ks != 1) ||
585 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
586 nc++;
587 if (ks == 1) trackIt = 1;
588 Int_t ipa = iparticle->GetFirstMother()-1;
589
590 iparent = (ipa > -1) ? pParent[ipa] : -1;
591
592//
593// store track information
594 p[0] = iparticle->Px();
595 p[1] = iparticle->Py();
596 p[2] = iparticle->Pz();
a920faf9 597 p[3] = iparticle->Energy();
598
2590ccf9 599 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
600 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
601 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
602
8d2cd130 603 Float_t tof=kconv*iparticle->T();
a920faf9 604
605 PushTrack(fTrackIt*trackIt, iparent, kf,
606 p[0], p[1], p[2], p[3],
607 origin[0], origin[1], origin[2], tof,
608 polar[0], polar[1], polar[2],
609 kPPrimary, nt, 1., ks);
8d2cd130 610 KeepTrack(nt);
611 pParent[i] = nt;
612 } // select particle
613 } // particle loop
614
615 if (pParent) delete[] pParent;
616
617 printf("\n I've put %i particles on the stack \n",nc);
618 return nc;
619}
620
621
622void AliGenPythia::FinishRun()
623{
624// Print x-section summary
625 fPythia->Pystat(1);
626 fQ /= fNev;
627 fX1 /= fNev;
628 fX2 /= fNev;
629 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
630 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
631
632
633}
634
635void AliGenPythia::AdjustWeights()
636{
637// Adjust the weights after generation of all events
638//
e2bddf81 639 if (gAlice) {
640 TParticle *part;
641 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
642 for (Int_t i=0; i<ntrack; i++) {
643 part= gAlice->GetMCApp()->Particle(i);
644 part->SetWeight(part->GetWeight()*fKineBias);
645 }
8d2cd130 646 }
647}
648
649void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
650{
651// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 652
1a626d4e 653 fAProjectile = a1;
654 fATarget = a2;
1d568bc2 655 fSetNuclei = kTRUE;
8d2cd130 656}
657
658
659void AliGenPythia::MakeHeader()
660{
661// Builds the event header, to be called after each event
e5c87a3d 662 if (fHeader) delete fHeader;
663 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 664//
665// Event type
e5c87a3d 666 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 667//
668// Number of trials
e5c87a3d 669 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 670//
671// Event Vertex
d25cfd65 672 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 673//
674// Jets that have triggered
675 if (fProcess == kPyJets)
676 {
677 Int_t ntrig, njet;
678 Float_t jets[4][10];
679 GetJets(njet, ntrig, jets);
680
681 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 682 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 683 jets[3][i]);
684 }
685 }
e2bddf81 686 if (gAlice) gAlice->SetGenEventHeader(fHeader);
8d2cd130 687}
688
689
690Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
691{
692// Check the kinematic trigger condition
693//
694 Double_t eta[2];
695 eta[0] = jet1->Eta();
696 eta[1] = jet2->Eta();
697 Double_t phi[2];
698 phi[0] = jet1->Phi();
699 phi[1] = jet2->Phi();
700 Int_t pdg[2];
701 pdg[0] = jet1->GetPdgCode();
702 pdg[1] = jet2->GetPdgCode();
703 Bool_t triggered = kFALSE;
704
705 if (fProcess == kPyJets) {
706 Int_t njets = 0;
707 Int_t ntrig = 0;
708 Float_t jets[4][10];
709//
710// Use Pythia clustering on parton level to determine jet axis
711//
712 GetJets(njets, ntrig, jets);
713
714 if (ntrig) triggered = kTRUE;
715//
716 } else {
717 Int_t ij = 0;
718 Int_t ig = 1;
719 if (pdg[0] == kGamma) {
720 ij = 1;
721 ig = 0;
722 }
723 //Check eta range first...
724 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
725 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
726 {
727 //Eta is okay, now check phi range
728 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
729 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
730 {
731 triggered = kTRUE;
732 }
733 }
734 }
735 return triggered;
736}
737
738AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
739{
740// Assignment operator
014a9521 741 rhs.Copy(*this);
8d2cd130 742 return *this;
743}
744
32d6ef7d 745void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag)
8d2cd130 746{
747//
748// Load event into Pythia Common Block
749//
750
32d6ef7d 751// AliRunLoader* rl = AliRunLoader::GetRunLoader();
752 Int_t npart = stack -> GetNprimary();
753 Int_t n0 = 0;
754
755 if (!flag) {
756 (fPythia->GetPyjets())->N = npart;
757 } else {
758 n0 = (fPythia->GetPyjets())->N;
759 (fPythia->GetPyjets())->N = n0 + npart;
760 }
761
762
8d2cd130 763 for (Int_t part = 0; part < npart; part++) {
32d6ef7d 764 TParticle *MPart = stack->Particle(part);
765
8d2cd130 766 Int_t kf = MPart->GetPdgCode();
767 Int_t ks = MPart->GetStatusCode();
32d6ef7d 768
8d2cd130 769 Float_t px = MPart->Px();
770 Float_t py = MPart->Py();
771 Float_t pz = MPart->Pz();
772 Float_t e = MPart->Energy();
a920faf9 773 Float_t m = MPart->GetCalcMass();
8d2cd130 774
775
32d6ef7d 776 (fPythia->GetPyjets())->P[0][part+n0] = px;
777 (fPythia->GetPyjets())->P[1][part+n0] = py;
778 (fPythia->GetPyjets())->P[2][part+n0] = pz;
779 (fPythia->GetPyjets())->P[3][part+n0] = e;
780 (fPythia->GetPyjets())->P[4][part+n0] = m;
8d2cd130 781
32d6ef7d 782 (fPythia->GetPyjets())->K[1][part+n0] = kf;
783 (fPythia->GetPyjets())->K[0][part+n0] = ks;
8d2cd130 784 }
785}
786
014a9521 787void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 788{
789//
790// Calls the Pythia jet finding algorithm to find jets in the current event
791//
792//
8d2cd130 793//
794// Save jets
795 Int_t n = fPythia->GetN();
796
797//
798// Run Jet Finder
799 fPythia->Pycell(njets);
800 Int_t i;
801 for (i = 0; i < njets; i++) {
802 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
803 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
804 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
805 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
806
807 jets[0][i] = px;
808 jets[1][i] = py;
809 jets[2][i] = pz;
810 jets[3][i] = e;
811 }
812}
813
814
815
816void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
817{
818//
819// Calls the Pythia clustering algorithm to find jets in the current event
820//
821 Int_t n = fPythia->GetN();
822 nJets = 0;
823 nJetsTrig = 0;
824 if (fJetReconstruction == kCluster) {
825//
826// Configure cluster algorithm
827//
828 fPythia->SetPARU(43, 2.);
829 fPythia->SetMSTU(41, 1);
830//
831// Call cluster algorithm
832//
833 fPythia->Pyclus(nJets);
834//
835// Loading jets from common block
836//
837 } else {
592f8307 838
8d2cd130 839//
840// Run Jet Finder
841 fPythia->Pycell(nJets);
842 }
843
844 Int_t i;
845 for (i = 0; i < nJets; i++) {
846 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
847 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
848 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
849 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
850 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 851 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 852 Float_t theta = TMath::ATan2(pt,pz);
853 Float_t et = e * TMath::Sin(theta);
854 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
855
856 if (
857 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 858 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 859 et > fEtMinJet && et < fEtMaxJet
860 )
861 {
862 jets[0][nJetsTrig] = px;
863 jets[1][nJetsTrig] = py;
864 jets[2][nJetsTrig] = pz;
865 jets[3][nJetsTrig] = e;
866 nJetsTrig++;
867
868 } else {
869// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
870 }
871 }
872}
873
874
875#ifdef never
876void AliGenPythia::Streamer(TBuffer &R__b)
877{
878 // Stream an object of class AliGenPythia.
879
880 if (R__b.IsReading()) {
881 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
882 AliGenerator::Streamer(R__b);
883 R__b >> (Int_t&)fProcess;
884 R__b >> (Int_t&)fStrucFunc;
885 R__b >> (Int_t&)fForceDecay;
886 R__b >> fEnergyCMS;
887 R__b >> fKineBias;
888 R__b >> fTrials;
889 fParentSelect.Streamer(R__b);
890 fChildSelect.Streamer(R__b);
891 R__b >> fXsection;
892// (AliPythia::Instance())->Streamer(R__b);
893 R__b >> fPtHardMin;
894 R__b >> fPtHardMax;
895// if (fDecayer) fDecayer->Streamer(R__b);
896 } else {
897 R__b.WriteVersion(AliGenPythia::IsA());
898 AliGenerator::Streamer(R__b);
899 R__b << (Int_t)fProcess;
900 R__b << (Int_t)fStrucFunc;
901 R__b << (Int_t)fForceDecay;
902 R__b << fEnergyCMS;
903 R__b << fKineBias;
904 R__b << fTrials;
905 fParentSelect.Streamer(R__b);
906 fChildSelect.Streamer(R__b);
907 R__b << fXsection;
908// R__b << fPythia;
909 R__b << fPtHardMin;
910 R__b << fPtHardMax;
911 // fDecayer->Streamer(R__b);
912 }
913}
914#endif
915