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Setting impact parameters. Updating criteria (M.Ivanov)
[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>
8d2cd130 33#include "AliConst.h"
34#include "AliDecayerPythia.h"
35#include "AliGenPythia.h"
5fa4b20b 36#include "AliHeader.h"
8d2cd130 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"
7c21f297 44#include "pyquenCommon.h"
8d2cd130 45
014a9521 46ClassImp(AliGenPythia)
8d2cd130 47
48AliGenPythia::AliGenPythia()
49 :AliGenMC()
50{
51// Default Constructor
52 fParticles = 0;
53 fPythia = 0;
e5c87a3d 54 fHeader = 0;
5fffd0fe 55 fReadFromFile = 0;
8d2cd130 56 fDecayer = new AliDecayerPythia();
57 SetEventListRange();
58 SetJetPhiRange();
59 SetJetEtaRange();
60 SetJetEtRange();
61 SetGammaPhiRange();
62 SetGammaEtaRange();
63 SetPtKick();
7ea3ea5b 64 SetQuench();
5fa4b20b 65 SetHadronisation();
1d568bc2 66 fSetNuclei = kFALSE;
7cdba479 67 if (!AliPythiaRndm::GetPythiaRandom())
68 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 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.;
5fffd0fe 81 fReadFromFile = 0;
8d2cd130 82 SetProcess();
83 SetStrucFunc();
84 SetForceDecay();
85 SetPtHard();
86 SetYHard();
87 SetEnergyCMS();
88 fDecayer = new AliDecayerPythia();
89 // Set random number generator
7cdba479 90 if (!AliPythiaRndm::GetPythiaRandom())
91 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 92 fFlavorSelect = 0;
93 // Produced particles
94 fParticles = new TClonesArray("TParticle",1000);
e5c87a3d 95 fHeader = 0;
8d2cd130 96 SetEventListRange();
97 SetJetPhiRange();
98 SetJetEtaRange();
99 SetJetEtRange();
100 SetGammaPhiRange();
101 SetGammaEtaRange();
102 SetJetReconstructionMode();
7ea3ea5b 103 SetQuench();
5fa4b20b 104 SetHadronisation();
8d2cd130 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;
592f8307 113 // Pycel
114 SetPycellParameters();
1d568bc2 115 fSetNuclei = kFALSE;
8d2cd130 116}
117
118AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
f936b8ea 119 :AliGenMC(Pythia)
8d2cd130 120{
121// copy constructor
122 Pythia.Copy(*this);
123}
124
125AliGenPythia::~AliGenPythia()
126{
127// Destructor
128}
129
592f8307 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
8d2cd130 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());
b88f5cea 159 fPythia=(AliPythia*) fMCEvGen;
e2bddf81 160
8d2cd130 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
1a626d4e 174 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
8d2cd130 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
5fa4b20b 195
196 if (fReadFromFile) {
197 fRL = AliRunLoader::Open(fFileName, "Partons");
198 fRL->LoadKinematics();
199 fRL->LoadHeader();
200 } else {
201 fRL = 0x0;
202 }
203
204
8d2cd130 205 //
206 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
207
208// Parent and Children Selection
209 switch (fProcess)
210 {
211 case kPyCharm:
212 case kPyCharmUnforced:
adf4d898 213 case kPyCharmPbPbMNR:
aabc7187 214 case kPyCharmppMNR:
215 case kPyCharmpPbMNR:
8d2cd130 216 fParentSelect[0] = 411;
217 fParentSelect[1] = 421;
218 fParentSelect[2] = 431;
219 fParentSelect[3] = 4122;
220 fFlavorSelect = 4;
221 break;
adf4d898 222 case kPyD0PbPbMNR:
223 case kPyD0pPbMNR:
224 case kPyD0ppMNR:
8d2cd130 225 fParentSelect[0] = 421;
226 fFlavorSelect = 4;
227 break;
90d7b703 228 case kPyDPlusPbPbMNR:
229 case kPyDPluspPbMNR:
230 case kPyDPlusppMNR:
231 fParentSelect[0] = 411;
232 fFlavorSelect = 4;
233 break;
8d2cd130 234 case kPyBeauty:
adf4d898 235 case kPyBeautyPbPbMNR:
236 case kPyBeautypPbMNR:
237 case kPyBeautyppMNR:
8d2cd130 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;
589380c6 266 case kPyW:
267 break;
8d2cd130 268 }
269//
592f8307 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//
8d2cd130 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//
1d568bc2 294//
295//
8d2cd130 296 AliGenMC::Init();
1d568bc2 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 }
32d6ef7d 304
305 if (fQuench) {
5fa4b20b 306 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
32d6ef7d 307 }
308
8d2cd130 309}
310
311void AliGenPythia::Generate()
312{
313// Generate one event
e5c87a3d 314
8d2cd130 315 fDecayer->ForceDecay();
316
317 Float_t polar[3] = {0,0,0};
318 Float_t origin[3] = {0,0,0};
a920faf9 319 Float_t p[4];
8d2cd130 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;
2590ccf9 327
8d2cd130 328
329 // Set collision vertex position
2590ccf9 330 if (fVertexSmear == kPerEvent) Vertex();
331
8d2cd130 332// event loop
333 while(1)
334 {
32d6ef7d 335//
5fa4b20b 336// Produce event
32d6ef7d 337//
32d6ef7d 338//
5fa4b20b 339// Switch hadronisation off
340//
341 fPythia->SetMSTJ(1, 0);
32d6ef7d 342//
5fa4b20b 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
32d6ef7d 356//
357// Run quenching routine
358//
5fa4b20b 359 if (fQuench == 1) {
360 fPythia->Quench();
361 } else if (fQuench == 2){
362 fPythia->Pyquen(208., 0, 0.);
363 }
32d6ef7d 364//
5fa4b20b 365// Switch hadronisation on
32d6ef7d 366//
5fa4b20b 367 fPythia->SetMSTJ(1, 1);
368//
369// .. and perform hadronisation
370// printf("Calling hadronisation %d\n", fPythia->GetN());
371 fPythia->Pyexec();
8d2cd130 372 fTrials++;
8d2cd130 373 fPythia->ImportParticles(fParticles,"All");
1d568bc2 374 Boost();
8d2cd130 375//
376//
377//
378 Int_t i;
379
5fa4b20b 380
8d2cd130 381 Int_t np = fParticles->GetEntriesFast();
5fa4b20b 382
7c21f297 383 if (np == 0) continue;
8d2cd130 384//
2590ccf9 385
8d2cd130 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];
5fa4b20b 390 for (i = 0; i < np; i++) {
8d2cd130 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 &&
589380c6 401 fProcess != kPyMbNonDiffr &&
402 fProcess != kPyW) {
8d2cd130 403
5fa4b20b 404 for (i = 0; i < np; i++) {
2590ccf9 405 TParticle* iparticle = (TParticle *) fParticles->At(i);
8d2cd130 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;
9ff6c04c 416 // Resonance
417 if (kfl > 100000) kfl %= 100000;
183a5ca9 418 if (kfl > 10000) kfl %= 10000;
8d2cd130 419 // meson ?
420 if (kfl > 10) kfl/=100;
421 // baryon
422 if (kfl > 10) kfl/=10;
8d2cd130 423 Int_t ipa = iparticle->GetFirstMother()-1;
424 Int_t kfMo = 0;
425
426 if (ipa > -1) {
427 TParticle * mother = (TParticle *) fParticles->At(ipa);
428 kfMo = TMath::Abs(mother->GetPdgCode());
429 }
430 // What to keep in Stack?
431 Bool_t flavorOK = kFALSE;
432 Bool_t selectOK = kFALSE;
433 if (fFeedDownOpt) {
32d6ef7d 434 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
8d2cd130 435 } else {
32d6ef7d 436 if (kfl > fFlavorSelect) {
437 nc = -1;
438 break;
439 }
440 if (kfl == fFlavorSelect) flavorOK = kTRUE;
8d2cd130 441 }
442 switch (fStackFillOpt) {
443 case kFlavorSelection:
32d6ef7d 444 selectOK = kTRUE;
445 break;
8d2cd130 446 case kParentSelection:
32d6ef7d 447 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
448 break;
8d2cd130 449 }
450 if (flavorOK && selectOK) {
451//
452// Heavy flavor hadron or quark
453//
454// Kinematic seletion on final state heavy flavor mesons
455 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
456 {
9ff6c04c 457 continue;
8d2cd130 458 }
459 pSelected[i] = 1;
460 if (ParentSelected(kf)) ++nParents; // Update parent count
461// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
462 } else {
463// Kinematic seletion on decay products
464 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
9ff6c04c 465 && !KinematicSelection(iparticle, 1))
8d2cd130 466 {
9ff6c04c 467 continue;
8d2cd130 468 }
469//
470// Decay products
471// Select if mother was selected and is not tracked
472
473 if (pSelected[ipa] &&
474 !trackIt[ipa] && // mother will be tracked ?
475 kfMo != 5 && // mother is b-quark, don't store fragments
476 kfMo != 4 && // mother is c-quark, don't store fragments
477 kf != 92) // don't store string
478 {
479//
480// Semi-stable or de-selected: diselect decay products:
481//
482//
483 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
484 {
485 Int_t ipF = iparticle->GetFirstDaughter();
486 Int_t ipL = iparticle->GetLastDaughter();
487 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
488 }
489// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
490 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
491 }
492 }
493 if (pSelected[i] == -1) pSelected[i] = 0;
494 if (!pSelected[i]) continue;
495 // Count quarks only if you did not include fragmentation
496 if (fFragmentation && kf <= 10) continue;
9ff6c04c 497
8d2cd130 498 nc++;
499// Decision on tracking
500 trackIt[i] = 0;
501//
502// Track final state particle
503 if (ks == 1) trackIt[i] = 1;
504// Track semi-stable particles
d25cfd65 505 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 506// Track particles selected by process if undecayed.
507 if (fForceDecay == kNoDecay) {
508 if (ParentSelected(kf)) trackIt[i] = 1;
509 } else {
510 if (ParentSelected(kf)) trackIt[i] = 0;
511 }
512 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
513//
514//
515
516 } // particle selection loop
517 if (nc > 0) {
518 for (i = 0; i<np; i++) {
519 if (!pSelected[i]) continue;
520 TParticle * iparticle = (TParticle *) fParticles->At(i);
521 kf = CheckPDGCode(iparticle->GetPdgCode());
522 Int_t ks = iparticle->GetStatusCode();
523 p[0] = iparticle->Px();
524 p[1] = iparticle->Py();
525 p[2] = iparticle->Pz();
a920faf9 526 p[3] = iparticle->Energy();
527
2590ccf9 528 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
529 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
530 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
531
8d2cd130 532 Float_t tof = kconv*iparticle->T();
533 Int_t ipa = iparticle->GetFirstMother()-1;
534 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 535
536 PushTrack(fTrackIt*trackIt[i], iparent, kf,
537 p[0], p[1], p[2], p[3],
538 origin[0], origin[1], origin[2], tof,
539 polar[0], polar[1], polar[2],
540 kPPrimary, nt, 1., ks);
8d2cd130 541 pParent[i] = nt;
542 KeepTrack(nt);
642f15cf 543 } // PushTrack loop
8d2cd130 544 }
545 } else {
546 nc = GenerateMB();
547 } // mb ?
548
549 if (pParent) delete[] pParent;
550 if (pSelected) delete[] pSelected;
551 if (trackIt) delete[] trackIt;
552
553 if (nc > 0) {
554 switch (fCountMode) {
555 case kCountAll:
556 // printf(" Count all \n");
557 jev += nc;
558 break;
559 case kCountParents:
560 // printf(" Count parents \n");
561 jev += nParents;
562 break;
563 case kCountTrackables:
564 // printf(" Count trackable \n");
565 jev += nTkbles;
566 break;
567 }
568 if (jev >= fNpart || fNpart == -1) {
569 fKineBias=Float_t(fNpart)/Float_t(fTrials);
570 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
571
572 fQ += fPythia->GetVINT(51);
573 fX1 += fPythia->GetVINT(41);
574 fX2 += fPythia->GetVINT(42);
575 fTrialsRun += fTrials;
576 fNev++;
577 MakeHeader();
578 break;
579 }
580 }
581 } // event loop
582 SetHighWaterMark(nt);
583// adjust weight due to kinematic selection
b88f5cea 584// AdjustWeights();
8d2cd130 585// get cross-section
586 fXsection=fPythia->GetPARI(1);
587}
588
589Int_t AliGenPythia::GenerateMB()
590{
591//
592// Min Bias selection and other global selections
593//
594 Int_t i, kf, nt, iparent;
595 Int_t nc = 0;
bf950da8 596 Float_t p[4];
8d2cd130 597 Float_t polar[3] = {0,0,0};
598 Float_t origin[3] = {0,0,0};
599// converts from mm/c to s
600 const Float_t kconv=0.001/2.999792458e8;
601
5fa4b20b 602
603
604 Int_t np = (fHadronisation) ? fParticles->GetEntriesFast() : fNpartons;
605
606
8d2cd130 607 Int_t* pParent = new Int_t[np];
608 for (i=0; i< np; i++) pParent[i] = -1;
609 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
610 TParticle* jet1 = (TParticle *) fParticles->At(6);
611 TParticle* jet2 = (TParticle *) fParticles->At(7);
612 if (!CheckTrigger(jet1, jet2)) return 0;
613 }
614
615 for (i = 0; i<np; i++) {
616 Int_t trackIt = 0;
617 TParticle * iparticle = (TParticle *) fParticles->At(i);
618 kf = CheckPDGCode(iparticle->GetPdgCode());
619 Int_t ks = iparticle->GetStatusCode();
620 Int_t km = iparticle->GetFirstMother();
621 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
622 (ks != 1) ||
623 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
624 nc++;
625 if (ks == 1) trackIt = 1;
626 Int_t ipa = iparticle->GetFirstMother()-1;
627
628 iparent = (ipa > -1) ? pParent[ipa] : -1;
629
630//
631// store track information
632 p[0] = iparticle->Px();
633 p[1] = iparticle->Py();
634 p[2] = iparticle->Pz();
a920faf9 635 p[3] = iparticle->Energy();
1406f599 636
a920faf9 637
2590ccf9 638 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
639 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
640 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
641
8d2cd130 642 Float_t tof=kconv*iparticle->T();
a920faf9 643
644 PushTrack(fTrackIt*trackIt, iparent, kf,
645 p[0], p[1], p[2], p[3],
646 origin[0], origin[1], origin[2], tof,
647 polar[0], polar[1], polar[2],
648 kPPrimary, nt, 1., ks);
5fa4b20b 649 //
650 // Special Treatment to store color-flow
651 //
652 if (ks == 3 || ks == 13 || ks == 14) {
653 TParticle* particle = 0;
654 if (fStack) {
655 particle = fStack->Particle(nt);
656 } else {
657 particle = gAlice->Stack()->Particle(nt);
658 }
659 particle->SetFirstDaughter(fPythia->GetK(2, i));
660 particle->SetLastDaughter(fPythia->GetK(3, i));
661 }
662
8d2cd130 663 KeepTrack(nt);
664 pParent[i] = nt;
665 } // select particle
666 } // particle loop
667
668 if (pParent) delete[] pParent;
669
670 printf("\n I've put %i particles on the stack \n",nc);
671 return nc;
672}
673
674
675void AliGenPythia::FinishRun()
676{
677// Print x-section summary
678 fPythia->Pystat(1);
2779fc64 679
680 if (fNev > 0.) {
681 fQ /= fNev;
682 fX1 /= fNev;
683 fX2 /= fNev;
684 }
685
8d2cd130 686 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
687 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
8d2cd130 688}
689
690void AliGenPythia::AdjustWeights()
691{
692// Adjust the weights after generation of all events
693//
e2bddf81 694 if (gAlice) {
695 TParticle *part;
696 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
697 for (Int_t i=0; i<ntrack; i++) {
698 part= gAlice->GetMCApp()->Particle(i);
699 part->SetWeight(part->GetWeight()*fKineBias);
700 }
8d2cd130 701 }
702}
703
704void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
705{
706// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 707
1a626d4e 708 fAProjectile = a1;
709 fATarget = a2;
1d568bc2 710 fSetNuclei = kTRUE;
8d2cd130 711}
712
713
714void AliGenPythia::MakeHeader()
715{
183a5ca9 716 if (gAlice) {
717 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
718 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
719 }
720
8d2cd130 721// Builds the event header, to be called after each event
e5c87a3d 722 if (fHeader) delete fHeader;
723 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 724//
725// Event type
e5c87a3d 726 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 727//
728// Number of trials
e5c87a3d 729 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 730//
731// Event Vertex
d25cfd65 732 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 733//
734// Jets that have triggered
735 if (fProcess == kPyJets)
736 {
737 Int_t ntrig, njet;
738 Float_t jets[4][10];
739 GetJets(njet, ntrig, jets);
9ff6c04c 740
8d2cd130 741
742 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 743 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 744 jets[3][i]);
745 }
746 }
5fa4b20b 747//
748// Copy relevant information from external header, if present.
749//
750 Float_t uqJet[4];
751
752 if (fRL) {
753 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
754 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
755 {
756 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
757
758
759 exHeader->TriggerJet(i, uqJet);
760 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
761 }
762 }
763//
764// Store quenching parameters
765//
766 if (fQuench){
767 Double_t z[4];
768 Double_t xp, yp;
7c21f297 769 if (fQuench == 1) {
770 // Pythia::Quench()
771 fPythia->GetQuenchingParameters(xp, yp, z);
772 } else {
773 // Pyquen
774 Double_t r1 = PARIMP.rb1;
775 Double_t r2 = PARIMP.rb2;
776 Double_t b = PARIMP.b1;
777 Double_t r = 0.5 * TMath::Sqrt(2. * (r1 * r1 + r2 * r2) - b * b);
778 Double_t phi = PARIMP.psib1;
779 xp = r * TMath::Cos(phi);
780 yp = r * TMath::Sin(phi);
781
782 }
783 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
784 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
785 }
5fa4b20b 786
787//
788// Pass header to RunLoader
789//
790 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(fHeader);
8d2cd130 791}
792
793
794Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
795{
796// Check the kinematic trigger condition
797//
798 Double_t eta[2];
799 eta[0] = jet1->Eta();
800 eta[1] = jet2->Eta();
801 Double_t phi[2];
802 phi[0] = jet1->Phi();
803 phi[1] = jet2->Phi();
804 Int_t pdg[2];
805 pdg[0] = jet1->GetPdgCode();
806 pdg[1] = jet2->GetPdgCode();
807 Bool_t triggered = kFALSE;
808
809 if (fProcess == kPyJets) {
810 Int_t njets = 0;
811 Int_t ntrig = 0;
812 Float_t jets[4][10];
813//
814// Use Pythia clustering on parton level to determine jet axis
815//
816 GetJets(njets, ntrig, jets);
817
818 if (ntrig) triggered = kTRUE;
819//
820 } else {
821 Int_t ij = 0;
822 Int_t ig = 1;
823 if (pdg[0] == kGamma) {
824 ij = 1;
825 ig = 0;
826 }
827 //Check eta range first...
828 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
829 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
830 {
831 //Eta is okay, now check phi range
832 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
833 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
834 {
835 triggered = kTRUE;
836 }
837 }
838 }
839 return triggered;
840}
841
842AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
843{
844// Assignment operator
014a9521 845 rhs.Copy(*this);
8d2cd130 846 return *this;
847}
848
5fa4b20b 849void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
8d2cd130 850{
851//
852// Load event into Pythia Common Block
853//
5fa4b20b 854
32d6ef7d 855 Int_t npart = stack -> GetNprimary();
856 Int_t n0 = 0;
857
858 if (!flag) {
859 (fPythia->GetPyjets())->N = npart;
860 } else {
861 n0 = (fPythia->GetPyjets())->N;
862 (fPythia->GetPyjets())->N = n0 + npart;
863 }
864
865
8d2cd130 866 for (Int_t part = 0; part < npart; part++) {
32d6ef7d 867 TParticle *MPart = stack->Particle(part);
868
5fa4b20b 869 Int_t kf = MPart->GetPdgCode();
870 Int_t ks = MPart->GetStatusCode();
871 Int_t idf = MPart->GetFirstDaughter();
872 Int_t idl = MPart->GetLastDaughter();
873
874 if (reHadr) {
875 if (ks == 11 || ks == 12) {
876 ks -= 10;
877 idf = -1;
878 idl = -1;
879 }
880 }
32d6ef7d 881
8d2cd130 882 Float_t px = MPart->Px();
883 Float_t py = MPart->Py();
884 Float_t pz = MPart->Pz();
885 Float_t e = MPart->Energy();
a920faf9 886 Float_t m = MPart->GetCalcMass();
8d2cd130 887
888
32d6ef7d 889 (fPythia->GetPyjets())->P[0][part+n0] = px;
890 (fPythia->GetPyjets())->P[1][part+n0] = py;
891 (fPythia->GetPyjets())->P[2][part+n0] = pz;
892 (fPythia->GetPyjets())->P[3][part+n0] = e;
893 (fPythia->GetPyjets())->P[4][part+n0] = m;
8d2cd130 894
32d6ef7d 895 (fPythia->GetPyjets())->K[1][part+n0] = kf;
896 (fPythia->GetPyjets())->K[0][part+n0] = ks;
5fa4b20b 897 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
898 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
899 (fPythia->GetPyjets())->K[2][part+n0] = MPart->GetFirstMother() + 1;
8d2cd130 900 }
901}
902
5fa4b20b 903
014a9521 904void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 905{
906//
907// Calls the Pythia jet finding algorithm to find jets in the current event
908//
909//
8d2cd130 910//
911// Save jets
912 Int_t n = fPythia->GetN();
913
914//
915// Run Jet Finder
916 fPythia->Pycell(njets);
917 Int_t i;
918 for (i = 0; i < njets; i++) {
919 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
920 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
921 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
922 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
923
924 jets[0][i] = px;
925 jets[1][i] = py;
926 jets[2][i] = pz;
927 jets[3][i] = e;
928 }
929}
930
931
932
933void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
934{
935//
936// Calls the Pythia clustering algorithm to find jets in the current event
937//
938 Int_t n = fPythia->GetN();
939 nJets = 0;
940 nJetsTrig = 0;
941 if (fJetReconstruction == kCluster) {
942//
943// Configure cluster algorithm
944//
945 fPythia->SetPARU(43, 2.);
946 fPythia->SetMSTU(41, 1);
947//
948// Call cluster algorithm
949//
950 fPythia->Pyclus(nJets);
951//
952// Loading jets from common block
953//
954 } else {
592f8307 955
8d2cd130 956//
957// Run Jet Finder
958 fPythia->Pycell(nJets);
959 }
960
961 Int_t i;
962 for (i = 0; i < nJets; i++) {
963 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
964 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
965 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
966 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
967 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 968 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 969 Float_t theta = TMath::ATan2(pt,pz);
970 Float_t et = e * TMath::Sin(theta);
971 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
8d2cd130 972 if (
973 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 974 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 975 et > fEtMinJet && et < fEtMaxJet
976 )
977 {
978 jets[0][nJetsTrig] = px;
979 jets[1][nJetsTrig] = py;
980 jets[2][nJetsTrig] = pz;
981 jets[3][nJetsTrig] = e;
982 nJetsTrig++;
5fa4b20b 983// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
8d2cd130 984 } else {
985// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
986 }
987 }
988}
989
990
991#ifdef never
992void AliGenPythia::Streamer(TBuffer &R__b)
993{
994 // Stream an object of class AliGenPythia.
995
996 if (R__b.IsReading()) {
997 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
998 AliGenerator::Streamer(R__b);
999 R__b >> (Int_t&)fProcess;
1000 R__b >> (Int_t&)fStrucFunc;
1001 R__b >> (Int_t&)fForceDecay;
1002 R__b >> fEnergyCMS;
1003 R__b >> fKineBias;
1004 R__b >> fTrials;
1005 fParentSelect.Streamer(R__b);
1006 fChildSelect.Streamer(R__b);
1007 R__b >> fXsection;
1008// (AliPythia::Instance())->Streamer(R__b);
1009 R__b >> fPtHardMin;
1010 R__b >> fPtHardMax;
1011// if (fDecayer) fDecayer->Streamer(R__b);
1012 } else {
1013 R__b.WriteVersion(AliGenPythia::IsA());
1014 AliGenerator::Streamer(R__b);
1015 R__b << (Int_t)fProcess;
1016 R__b << (Int_t)fStrucFunc;
1017 R__b << (Int_t)fForceDecay;
1018 R__b << fEnergyCMS;
1019 R__b << fKineBias;
1020 R__b << fTrials;
1021 fParentSelect.Streamer(R__b);
1022 fChildSelect.Streamer(R__b);
1023 R__b << fXsection;
1024// R__b << fPythia;
1025 R__b << fPtHardMin;
1026 R__b << fPtHardMax;
1027 // fDecayer->Streamer(R__b);
1028 }
1029}
1030#endif
1031
90d7b703 1032
589380c6 1033