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D+ -> K pipi added. (A. Dainese)
[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;
90d7b703 215 case kPyDPlusPbPbMNR:
216 case kPyDPluspPbMNR:
217 case kPyDPlusppMNR:
218 fParentSelect[0] = 411;
219 fFlavorSelect = 4;
220 break;
8d2cd130 221 case kPyBeauty:
adf4d898 222 case kPyBeautyPbPbMNR:
223 case kPyBeautypPbMNR:
224 case kPyBeautyppMNR:
8d2cd130 225 fParentSelect[0]= 511;
226 fParentSelect[1]= 521;
227 fParentSelect[2]= 531;
228 fParentSelect[3]= 5122;
229 fParentSelect[4]= 5132;
230 fParentSelect[5]= 5232;
231 fParentSelect[6]= 5332;
232 fFlavorSelect = 5;
233 break;
234 case kPyBeautyUnforced:
235 fParentSelect[0] = 511;
236 fParentSelect[1] = 521;
237 fParentSelect[2] = 531;
238 fParentSelect[3] = 5122;
239 fParentSelect[4] = 5132;
240 fParentSelect[5] = 5232;
241 fParentSelect[6] = 5332;
242 fFlavorSelect = 5;
243 break;
244 case kPyJpsiChi:
245 case kPyJpsi:
246 fParentSelect[0] = 443;
247 break;
248 case kPyMb:
249 case kPyMbNonDiffr:
250 case kPyJets:
251 case kPyDirectGamma:
252 break;
253 }
254//
592f8307 255//
256// JetFinder for Trigger
257//
258// Configure detector (EMCAL like)
259//
260 fPythia->SetPARU(51, fPycellEtaMax);
261 fPythia->SetMSTU(51, fPycellNEta);
262 fPythia->SetMSTU(52, fPycellNPhi);
263//
264// Configure Jet Finder
265//
266 fPythia->SetPARU(58, fPycellThreshold);
267 fPythia->SetPARU(52, fPycellEtSeed);
268 fPythia->SetPARU(53, fPycellMinEtJet);
269 fPythia->SetPARU(54, fPycellMaxRadius);
270 fPythia->SetMSTU(54, 2);
271//
8d2cd130 272// This counts the total number of calls to Pyevnt() per run.
273 fTrialsRun = 0;
274 fQ = 0.;
275 fX1 = 0.;
276 fX2 = 0.;
277 fNev = 0 ;
278//
1d568bc2 279//
280//
8d2cd130 281 AliGenMC::Init();
1d568bc2 282//
283//
284//
285 if (fSetNuclei) {
286 fDyBoost = 0;
287 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
288 }
32d6ef7d 289
290 if (fQuench) {
1406f599 291 fPythia->InitQuenching(0., 0.05, 1.45, 8., 1);
32d6ef7d 292 }
293
8d2cd130 294}
295
296void AliGenPythia::Generate()
297{
298// Generate one event
e5c87a3d 299
8d2cd130 300 fDecayer->ForceDecay();
301
302 Float_t polar[3] = {0,0,0};
303 Float_t origin[3] = {0,0,0};
a920faf9 304 Float_t p[4];
8d2cd130 305// converts from mm/c to s
306 const Float_t kconv=0.001/2.999792458e8;
307//
308 Int_t nt=0;
309 Int_t jev=0;
310 Int_t j, kf;
311 fTrials=0;
2590ccf9 312
8d2cd130 313
314 // Set collision vertex position
2590ccf9 315 if (fVertexSmear == kPerEvent) Vertex();
316
8d2cd130 317// event loop
318 while(1)
319 {
32d6ef7d 320//
321// If quenching option has been selected switch off fragmentation first
322//
7ea3ea5b 323 if (fQuench) {
324 fPythia->SetMSTJ(1, 0);
325 }
32d6ef7d 326//
327// Produce event
328//
8d2cd130 329 fPythia->Pyevnt();
7ea3ea5b 330 if (fQuench) {
32d6ef7d 331//
332// Run quenching routine
333//
7ea3ea5b 334 fPythia->Quench();
1406f599 335// fPythia->Pylist(1);
32d6ef7d 336//
337// Switch fragmentation on
7ea3ea5b 338 fPythia->SetMSTJ(1, 1);
32d6ef7d 339//
340// .. and perform fragmentation
7ea3ea5b 341 fPythia->Pyexec();
1406f599 342// fPythia->Pylist(1);
32d6ef7d 343
7ea3ea5b 344 }
345
e2bddf81 346 if (gAlice) {
347 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
348 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
349 }
7ea3ea5b 350
8d2cd130 351 fTrials++;
8d2cd130 352 fPythia->ImportParticles(fParticles,"All");
1d568bc2 353 Boost();
8d2cd130 354//
355//
356//
357 Int_t i;
358
359 Int_t np = fParticles->GetEntriesFast();
360 if (np == 0 ) continue;
8d2cd130 361//
2590ccf9 362
8d2cd130 363//
364 Int_t* pParent = new Int_t[np];
365 Int_t* pSelected = new Int_t[np];
366 Int_t* trackIt = new Int_t[np];
367 for (i=0; i< np; i++) {
368 pParent[i] = -1;
369 pSelected[i] = 0;
370 trackIt[i] = 0;
371 }
372
373 Int_t nc = 0; // Total n. of selected particles
374 Int_t nParents = 0; // Selected parents
375 Int_t nTkbles = 0; // Trackable particles
376 if (fProcess != kPyMb && fProcess != kPyJets &&
377 fProcess != kPyDirectGamma &&
378 fProcess != kPyMbNonDiffr) {
379
380 for (i = 0; i<np; i++) {
2590ccf9 381 TParticle* iparticle = (TParticle *) fParticles->At(i);
8d2cd130 382 Int_t ks = iparticle->GetStatusCode();
383 kf = CheckPDGCode(iparticle->GetPdgCode());
384// No initial state partons
385 if (ks==21) continue;
386//
387// Heavy Flavor Selection
388//
389 // quark ?
390 kf = TMath::Abs(kf);
391 Int_t kfl = kf;
392 // meson ?
393 if (kfl > 10) kfl/=100;
394 // baryon
395 if (kfl > 10) kfl/=10;
396 if (kfl > 10) kfl/=10;
397
398 Int_t ipa = iparticle->GetFirstMother()-1;
399 Int_t kfMo = 0;
400
401 if (ipa > -1) {
402 TParticle * mother = (TParticle *) fParticles->At(ipa);
403 kfMo = TMath::Abs(mother->GetPdgCode());
404 }
405 // What to keep in Stack?
406 Bool_t flavorOK = kFALSE;
407 Bool_t selectOK = kFALSE;
408 if (fFeedDownOpt) {
32d6ef7d 409 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
8d2cd130 410 } else {
32d6ef7d 411 if (kfl > fFlavorSelect) {
412 nc = -1;
413 break;
414 }
415 if (kfl == fFlavorSelect) flavorOK = kTRUE;
8d2cd130 416 }
417 switch (fStackFillOpt) {
418 case kFlavorSelection:
32d6ef7d 419 selectOK = kTRUE;
420 break;
8d2cd130 421 case kParentSelection:
32d6ef7d 422 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
423 break;
8d2cd130 424 }
425 if (flavorOK && selectOK) {
426//
427// Heavy flavor hadron or quark
428//
429// Kinematic seletion on final state heavy flavor mesons
430 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
431 {
432 continue;
433 }
434 pSelected[i] = 1;
435 if (ParentSelected(kf)) ++nParents; // Update parent count
436// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
437 } else {
438// Kinematic seletion on decay products
439 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
440 && !KinematicSelection(iparticle, 1))
441 {
442 continue;
443 }
444//
445// Decay products
446// Select if mother was selected and is not tracked
447
448 if (pSelected[ipa] &&
449 !trackIt[ipa] && // mother will be tracked ?
450 kfMo != 5 && // mother is b-quark, don't store fragments
451 kfMo != 4 && // mother is c-quark, don't store fragments
452 kf != 92) // don't store string
453 {
454//
455// Semi-stable or de-selected: diselect decay products:
456//
457//
458 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
459 {
460 Int_t ipF = iparticle->GetFirstDaughter();
461 Int_t ipL = iparticle->GetLastDaughter();
462 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
463 }
464// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
465 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
466 }
467 }
468 if (pSelected[i] == -1) pSelected[i] = 0;
469 if (!pSelected[i]) continue;
470 // Count quarks only if you did not include fragmentation
471 if (fFragmentation && kf <= 10) continue;
472 nc++;
473// Decision on tracking
474 trackIt[i] = 0;
475//
476// Track final state particle
477 if (ks == 1) trackIt[i] = 1;
478// Track semi-stable particles
d25cfd65 479 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 480// Track particles selected by process if undecayed.
481 if (fForceDecay == kNoDecay) {
482 if (ParentSelected(kf)) trackIt[i] = 1;
483 } else {
484 if (ParentSelected(kf)) trackIt[i] = 0;
485 }
486 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
487//
488//
489
490 } // particle selection loop
491 if (nc > 0) {
492 for (i = 0; i<np; i++) {
493 if (!pSelected[i]) continue;
494 TParticle * iparticle = (TParticle *) fParticles->At(i);
495 kf = CheckPDGCode(iparticle->GetPdgCode());
496 Int_t ks = iparticle->GetStatusCode();
497 p[0] = iparticle->Px();
498 p[1] = iparticle->Py();
499 p[2] = iparticle->Pz();
a920faf9 500 p[3] = iparticle->Energy();
501
2590ccf9 502 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
503 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
504 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
505
8d2cd130 506 Float_t tof = kconv*iparticle->T();
507 Int_t ipa = iparticle->GetFirstMother()-1;
508 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 509
510 PushTrack(fTrackIt*trackIt[i], iparent, kf,
511 p[0], p[1], p[2], p[3],
512 origin[0], origin[1], origin[2], tof,
513 polar[0], polar[1], polar[2],
514 kPPrimary, nt, 1., ks);
8d2cd130 515 pParent[i] = nt;
516 KeepTrack(nt);
642f15cf 517 } // PushTrack loop
8d2cd130 518 }
519 } else {
520 nc = GenerateMB();
521 } // mb ?
522
523 if (pParent) delete[] pParent;
524 if (pSelected) delete[] pSelected;
525 if (trackIt) delete[] trackIt;
526
527 if (nc > 0) {
528 switch (fCountMode) {
529 case kCountAll:
530 // printf(" Count all \n");
531 jev += nc;
532 break;
533 case kCountParents:
534 // printf(" Count parents \n");
535 jev += nParents;
536 break;
537 case kCountTrackables:
538 // printf(" Count trackable \n");
539 jev += nTkbles;
540 break;
541 }
542 if (jev >= fNpart || fNpart == -1) {
543 fKineBias=Float_t(fNpart)/Float_t(fTrials);
544 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
545
546 fQ += fPythia->GetVINT(51);
547 fX1 += fPythia->GetVINT(41);
548 fX2 += fPythia->GetVINT(42);
549 fTrialsRun += fTrials;
550 fNev++;
551 MakeHeader();
552 break;
553 }
554 }
555 } // event loop
556 SetHighWaterMark(nt);
557// adjust weight due to kinematic selection
b88f5cea 558// AdjustWeights();
8d2cd130 559// get cross-section
560 fXsection=fPythia->GetPARI(1);
561}
562
563Int_t AliGenPythia::GenerateMB()
564{
565//
566// Min Bias selection and other global selections
567//
568 Int_t i, kf, nt, iparent;
569 Int_t nc = 0;
bf950da8 570 Float_t p[4];
8d2cd130 571 Float_t polar[3] = {0,0,0};
572 Float_t origin[3] = {0,0,0};
573// converts from mm/c to s
574 const Float_t kconv=0.001/2.999792458e8;
575
576 Int_t np = fParticles->GetEntriesFast();
577 Int_t* pParent = new Int_t[np];
578 for (i=0; i< np; i++) pParent[i] = -1;
579 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
580 TParticle* jet1 = (TParticle *) fParticles->At(6);
581 TParticle* jet2 = (TParticle *) fParticles->At(7);
582 if (!CheckTrigger(jet1, jet2)) return 0;
583 }
584
585 for (i = 0; i<np; i++) {
586 Int_t trackIt = 0;
587 TParticle * iparticle = (TParticle *) fParticles->At(i);
588 kf = CheckPDGCode(iparticle->GetPdgCode());
589 Int_t ks = iparticle->GetStatusCode();
590 Int_t km = iparticle->GetFirstMother();
591 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
592 (ks != 1) ||
593 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
594 nc++;
595 if (ks == 1) trackIt = 1;
596 Int_t ipa = iparticle->GetFirstMother()-1;
597
598 iparent = (ipa > -1) ? pParent[ipa] : -1;
599
600//
601// store track information
602 p[0] = iparticle->Px();
603 p[1] = iparticle->Py();
604 p[2] = iparticle->Pz();
a920faf9 605 p[3] = iparticle->Energy();
1406f599 606
a920faf9 607
2590ccf9 608 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
609 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
610 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
611
8d2cd130 612 Float_t tof=kconv*iparticle->T();
a920faf9 613
614 PushTrack(fTrackIt*trackIt, iparent, kf,
615 p[0], p[1], p[2], p[3],
616 origin[0], origin[1], origin[2], tof,
617 polar[0], polar[1], polar[2],
618 kPPrimary, nt, 1., ks);
8d2cd130 619 KeepTrack(nt);
620 pParent[i] = nt;
621 } // select particle
622 } // particle loop
623
624 if (pParent) delete[] pParent;
625
626 printf("\n I've put %i particles on the stack \n",nc);
627 return nc;
628}
629
630
631void AliGenPythia::FinishRun()
632{
633// Print x-section summary
634 fPythia->Pystat(1);
635 fQ /= fNev;
636 fX1 /= fNev;
637 fX2 /= fNev;
638 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
639 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
640
641
642}
643
644void AliGenPythia::AdjustWeights()
645{
646// Adjust the weights after generation of all events
647//
e2bddf81 648 if (gAlice) {
649 TParticle *part;
650 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
651 for (Int_t i=0; i<ntrack; i++) {
652 part= gAlice->GetMCApp()->Particle(i);
653 part->SetWeight(part->GetWeight()*fKineBias);
654 }
8d2cd130 655 }
656}
657
658void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
659{
660// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 661
1a626d4e 662 fAProjectile = a1;
663 fATarget = a2;
1d568bc2 664 fSetNuclei = kTRUE;
8d2cd130 665}
666
667
668void AliGenPythia::MakeHeader()
669{
670// Builds the event header, to be called after each event
e5c87a3d 671 if (fHeader) delete fHeader;
672 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 673//
674// Event type
e5c87a3d 675 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 676//
677// Number of trials
e5c87a3d 678 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 679//
680// Event Vertex
d25cfd65 681 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 682//
683// Jets that have triggered
684 if (fProcess == kPyJets)
685 {
686 Int_t ntrig, njet;
687 Float_t jets[4][10];
688 GetJets(njet, ntrig, jets);
689
690 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 691 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 692 jets[3][i]);
693 }
694 }
e2bddf81 695 if (gAlice) gAlice->SetGenEventHeader(fHeader);
8d2cd130 696}
697
698
699Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
700{
701// Check the kinematic trigger condition
702//
703 Double_t eta[2];
704 eta[0] = jet1->Eta();
705 eta[1] = jet2->Eta();
706 Double_t phi[2];
707 phi[0] = jet1->Phi();
708 phi[1] = jet2->Phi();
709 Int_t pdg[2];
710 pdg[0] = jet1->GetPdgCode();
711 pdg[1] = jet2->GetPdgCode();
712 Bool_t triggered = kFALSE;
713
714 if (fProcess == kPyJets) {
715 Int_t njets = 0;
716 Int_t ntrig = 0;
717 Float_t jets[4][10];
718//
719// Use Pythia clustering on parton level to determine jet axis
720//
721 GetJets(njets, ntrig, jets);
722
723 if (ntrig) triggered = kTRUE;
724//
725 } else {
726 Int_t ij = 0;
727 Int_t ig = 1;
728 if (pdg[0] == kGamma) {
729 ij = 1;
730 ig = 0;
731 }
732 //Check eta range first...
733 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
734 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
735 {
736 //Eta is okay, now check phi range
737 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
738 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
739 {
740 triggered = kTRUE;
741 }
742 }
743 }
744 return triggered;
745}
746
747AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
748{
749// Assignment operator
014a9521 750 rhs.Copy(*this);
8d2cd130 751 return *this;
752}
753
32d6ef7d 754void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag)
8d2cd130 755{
756//
757// Load event into Pythia Common Block
758//
759
32d6ef7d 760// AliRunLoader* rl = AliRunLoader::GetRunLoader();
761 Int_t npart = stack -> GetNprimary();
762 Int_t n0 = 0;
763
764 if (!flag) {
765 (fPythia->GetPyjets())->N = npart;
766 } else {
767 n0 = (fPythia->GetPyjets())->N;
768 (fPythia->GetPyjets())->N = n0 + npart;
769 }
770
771
8d2cd130 772 for (Int_t part = 0; part < npart; part++) {
32d6ef7d 773 TParticle *MPart = stack->Particle(part);
774
8d2cd130 775 Int_t kf = MPart->GetPdgCode();
776 Int_t ks = MPart->GetStatusCode();
32d6ef7d 777
8d2cd130 778 Float_t px = MPart->Px();
779 Float_t py = MPart->Py();
780 Float_t pz = MPart->Pz();
781 Float_t e = MPart->Energy();
a920faf9 782 Float_t m = MPart->GetCalcMass();
8d2cd130 783
784
32d6ef7d 785 (fPythia->GetPyjets())->P[0][part+n0] = px;
786 (fPythia->GetPyjets())->P[1][part+n0] = py;
787 (fPythia->GetPyjets())->P[2][part+n0] = pz;
788 (fPythia->GetPyjets())->P[3][part+n0] = e;
789 (fPythia->GetPyjets())->P[4][part+n0] = m;
8d2cd130 790
32d6ef7d 791 (fPythia->GetPyjets())->K[1][part+n0] = kf;
792 (fPythia->GetPyjets())->K[0][part+n0] = ks;
8d2cd130 793 }
794}
795
014a9521 796void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 797{
798//
799// Calls the Pythia jet finding algorithm to find jets in the current event
800//
801//
8d2cd130 802//
803// Save jets
804 Int_t n = fPythia->GetN();
805
806//
807// Run Jet Finder
808 fPythia->Pycell(njets);
809 Int_t i;
810 for (i = 0; i < njets; i++) {
811 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
812 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
813 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
814 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
815
816 jets[0][i] = px;
817 jets[1][i] = py;
818 jets[2][i] = pz;
819 jets[3][i] = e;
820 }
821}
822
823
824
825void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
826{
827//
828// Calls the Pythia clustering algorithm to find jets in the current event
829//
830 Int_t n = fPythia->GetN();
831 nJets = 0;
832 nJetsTrig = 0;
833 if (fJetReconstruction == kCluster) {
834//
835// Configure cluster algorithm
836//
837 fPythia->SetPARU(43, 2.);
838 fPythia->SetMSTU(41, 1);
839//
840// Call cluster algorithm
841//
842 fPythia->Pyclus(nJets);
843//
844// Loading jets from common block
845//
846 } else {
592f8307 847
8d2cd130 848//
849// Run Jet Finder
850 fPythia->Pycell(nJets);
851 }
852
853 Int_t i;
854 for (i = 0; i < nJets; i++) {
855 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
856 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
857 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
858 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
859 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 860 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 861 Float_t theta = TMath::ATan2(pt,pz);
862 Float_t et = e * TMath::Sin(theta);
863 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
864
865 if (
866 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 867 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 868 et > fEtMinJet && et < fEtMaxJet
869 )
870 {
871 jets[0][nJetsTrig] = px;
872 jets[1][nJetsTrig] = py;
873 jets[2][nJetsTrig] = pz;
874 jets[3][nJetsTrig] = e;
875 nJetsTrig++;
876
877 } else {
878// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
879 }
880 }
881}
882
883
884#ifdef never
885void AliGenPythia::Streamer(TBuffer &R__b)
886{
887 // Stream an object of class AliGenPythia.
888
889 if (R__b.IsReading()) {
890 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
891 AliGenerator::Streamer(R__b);
892 R__b >> (Int_t&)fProcess;
893 R__b >> (Int_t&)fStrucFunc;
894 R__b >> (Int_t&)fForceDecay;
895 R__b >> fEnergyCMS;
896 R__b >> fKineBias;
897 R__b >> fTrials;
898 fParentSelect.Streamer(R__b);
899 fChildSelect.Streamer(R__b);
900 R__b >> fXsection;
901// (AliPythia::Instance())->Streamer(R__b);
902 R__b >> fPtHardMin;
903 R__b >> fPtHardMax;
904// if (fDecayer) fDecayer->Streamer(R__b);
905 } else {
906 R__b.WriteVersion(AliGenPythia::IsA());
907 AliGenerator::Streamer(R__b);
908 R__b << (Int_t)fProcess;
909 R__b << (Int_t)fStrucFunc;
910 R__b << (Int_t)fForceDecay;
911 R__b << fEnergyCMS;
912 R__b << fKineBias;
913 R__b << fTrials;
914 fParentSelect.Streamer(R__b);
915 fChildSelect.Streamer(R__b);
916 R__b << fXsection;
917// R__b << fPythia;
918 R__b << fPtHardMin;
919 R__b << fPtHardMax;
920 // fDecayer->Streamer(R__b);
921 }
922}
923#endif
924
90d7b703 925