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ESD track based on AliExternalTrackParam. Class redesign and clean-up (Yu.Belikov)
[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;
f913ec4f 56 fEventTime = 0.;
8ec89232 57 fInteractionRate = 0.;
9d7108a7 58 fTimeWindow = 0.;
59 fEventsTime = 0;
60 fCurSubEvent = 0;
8d2cd130 61 fDecayer = new AliDecayerPythia();
62 SetEventListRange();
63 SetJetPhiRange();
64 SetJetEtaRange();
65 SetJetEtRange();
66 SetGammaPhiRange();
67 SetGammaEtaRange();
68 SetPtKick();
7ea3ea5b 69 SetQuench();
5fa4b20b 70 SetHadronisation();
1d568bc2 71 fSetNuclei = kFALSE;
7cdba479 72 if (!AliPythiaRndm::GetPythiaRandom())
73 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 74}
75
76AliGenPythia::AliGenPythia(Int_t npart)
77 :AliGenMC(npart)
78{
79// default charm production at 5. 5 TeV
80// semimuonic decay
81// structure function GRVHO
82//
83 fName = "Pythia";
84 fTitle= "Particle Generator using PYTHIA";
85 fXsection = 0.;
5fffd0fe 86 fReadFromFile = 0;
f913ec4f 87 fEventTime = 0.;
8ec89232 88 fInteractionRate = 0.;
9d7108a7 89 fTimeWindow = 0.;
90 fEventsTime = 0;
91 fCurSubEvent = 0;
8d2cd130 92 SetProcess();
93 SetStrucFunc();
94 SetForceDecay();
95 SetPtHard();
96 SetYHard();
97 SetEnergyCMS();
98 fDecayer = new AliDecayerPythia();
99 // Set random number generator
7cdba479 100 if (!AliPythiaRndm::GetPythiaRandom())
101 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 102 fFlavorSelect = 0;
103 // Produced particles
104 fParticles = new TClonesArray("TParticle",1000);
e5c87a3d 105 fHeader = 0;
8d2cd130 106 SetEventListRange();
107 SetJetPhiRange();
108 SetJetEtaRange();
109 SetJetEtRange();
110 SetGammaPhiRange();
111 SetGammaEtaRange();
112 SetJetReconstructionMode();
7ea3ea5b 113 SetQuench();
5fa4b20b 114 SetHadronisation();
8d2cd130 115 SetPtKick();
116 // Options determining what to keep in the stack (Heavy flavour generation)
117 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
118 fFeedDownOpt = kTRUE; // allow feed down from higher family
119 // Fragmentation on/off
120 fFragmentation = kTRUE;
121 // Default counting mode
122 fCountMode = kCountAll;
592f8307 123 // Pycel
124 SetPycellParameters();
1d568bc2 125 fSetNuclei = kFALSE;
8d2cd130 126}
127
128AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
f936b8ea 129 :AliGenMC(Pythia)
8d2cd130 130{
131// copy constructor
132 Pythia.Copy(*this);
133}
134
135AliGenPythia::~AliGenPythia()
136{
137// Destructor
9d7108a7 138 if(fEventsTime) delete fEventsTime;
139}
140
141void AliGenPythia::SetInteractionRate(Float_t rate,Float_t timewindow)
142{
143// Generate pileup using user specified rate
144 fInteractionRate = rate;
145 fTimeWindow = timewindow;
146 GeneratePileup();
147}
148
149void AliGenPythia::GeneratePileup()
150{
151// Generate sub events time for pileup
152 fEventsTime = 0;
153 if(fInteractionRate == 0.) {
154 Warning("GeneratePileup","Zero interaction specified. Skipping pileup generation.\n");
155 return;
156 }
157
158 Int_t npart = NumberParticles();
159 if(npart < 0) {
160 Warning("GeneratePileup","Negative number of particles. Skipping pileup generation.\n");
161 return;
162 }
163
164 if(fEventsTime) delete fEventsTime;
165 fEventsTime = new TArrayF(npart);
166 TArrayF &array = *fEventsTime;
167 for(Int_t ipart = 0; ipart < npart; ipart++)
168 array[ipart] = 0.;
169
170 Float_t eventtime = 0.;
171 while(1)
172 {
173 eventtime += (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
174 if(eventtime > fTimeWindow) break;
175 array.Set(array.GetSize()+1);
176 array[array.GetSize()-1] = eventtime;
177 }
178
179 eventtime = 0.;
180 while(1)
181 {
182 eventtime -= (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
183 if(TMath::Abs(eventtime) > fTimeWindow) break;
184 array.Set(array.GetSize()+1);
185 array[array.GetSize()-1] = eventtime;
186 }
187
188 SetNumberParticles(fEventsTime->GetSize());
8d2cd130 189}
190
592f8307 191void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
192 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
193{
194// Set pycell parameters
195 fPycellEtaMax = etamax;
196 fPycellNEta = neta;
197 fPycellNPhi = nphi;
198 fPycellThreshold = thresh;
199 fPycellEtSeed = etseed;
200 fPycellMinEtJet = minet;
201 fPycellMaxRadius = r;
202}
203
204
205
8d2cd130 206void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
207{
208 // Set a range of event numbers, for which a table
209 // of generated particle will be printed
210 fDebugEventFirst = eventFirst;
211 fDebugEventLast = eventLast;
212 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
213}
214
215void AliGenPythia::Init()
216{
217// Initialisation
218
219 SetMC(AliPythia::Instance());
b88f5cea 220 fPythia=(AliPythia*) fMCEvGen;
e2bddf81 221
8d2cd130 222//
223 fParentWeight=1./Float_t(fNpart);
224//
225// Forward Paramters to the AliPythia object
226 fDecayer->SetForceDecay(fForceDecay);
227 fDecayer->Init();
228
229
230 fPythia->SetCKIN(3,fPtHardMin);
231 fPythia->SetCKIN(4,fPtHardMax);
232 fPythia->SetCKIN(7,fYHardMin);
233 fPythia->SetCKIN(8,fYHardMax);
234
1a626d4e 235 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
8d2cd130 236 // Fragmentation?
237 if (fFragmentation) {
238 fPythia->SetMSTP(111,1);
239 } else {
240 fPythia->SetMSTP(111,0);
241 }
242
243
244// initial state radiation
245 fPythia->SetMSTP(61,fGinit);
246// final state radiation
247 fPythia->SetMSTP(71,fGfinal);
248// pt - kick
249 if (fPtKick > 0.) {
250 fPythia->SetMSTP(91,1);
251 fPythia->SetPARP(91,fPtKick);
252 } else {
253 fPythia->SetMSTP(91,0);
254 }
255
5fa4b20b 256
257 if (fReadFromFile) {
258 fRL = AliRunLoader::Open(fFileName, "Partons");
259 fRL->LoadKinematics();
260 fRL->LoadHeader();
261 } else {
262 fRL = 0x0;
263 }
264
265
8d2cd130 266 //
267 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
268
269// Parent and Children Selection
270 switch (fProcess)
271 {
65f2626c 272 case kPyOldUEQ2ordered:
273 case kPyOldUEQ2ordered2:
274 case kPyOldPopcorn:
275 break;
8d2cd130 276 case kPyCharm:
277 case kPyCharmUnforced:
adf4d898 278 case kPyCharmPbPbMNR:
aabc7187 279 case kPyCharmppMNR:
280 case kPyCharmpPbMNR:
8d2cd130 281 fParentSelect[0] = 411;
282 fParentSelect[1] = 421;
283 fParentSelect[2] = 431;
284 fParentSelect[3] = 4122;
285 fFlavorSelect = 4;
286 break;
adf4d898 287 case kPyD0PbPbMNR:
288 case kPyD0pPbMNR:
289 case kPyD0ppMNR:
8d2cd130 290 fParentSelect[0] = 421;
291 fFlavorSelect = 4;
292 break;
90d7b703 293 case kPyDPlusPbPbMNR:
294 case kPyDPluspPbMNR:
295 case kPyDPlusppMNR:
296 fParentSelect[0] = 411;
297 fFlavorSelect = 4;
298 break;
8d2cd130 299 case kPyBeauty:
adf4d898 300 case kPyBeautyPbPbMNR:
301 case kPyBeautypPbMNR:
302 case kPyBeautyppMNR:
8d2cd130 303 fParentSelect[0]= 511;
304 fParentSelect[1]= 521;
305 fParentSelect[2]= 531;
306 fParentSelect[3]= 5122;
307 fParentSelect[4]= 5132;
308 fParentSelect[5]= 5232;
309 fParentSelect[6]= 5332;
310 fFlavorSelect = 5;
311 break;
312 case kPyBeautyUnforced:
313 fParentSelect[0] = 511;
314 fParentSelect[1] = 521;
315 fParentSelect[2] = 531;
316 fParentSelect[3] = 5122;
317 fParentSelect[4] = 5132;
318 fParentSelect[5] = 5232;
319 fParentSelect[6] = 5332;
320 fFlavorSelect = 5;
321 break;
322 case kPyJpsiChi:
323 case kPyJpsi:
324 fParentSelect[0] = 443;
325 break;
326 case kPyMb:
327 case kPyMbNonDiffr:
328 case kPyJets:
329 case kPyDirectGamma:
330 break;
589380c6 331 case kPyW:
332 break;
8d2cd130 333 }
334//
592f8307 335//
336// JetFinder for Trigger
337//
338// Configure detector (EMCAL like)
339//
340 fPythia->SetPARU(51, fPycellEtaMax);
341 fPythia->SetMSTU(51, fPycellNEta);
342 fPythia->SetMSTU(52, fPycellNPhi);
343//
344// Configure Jet Finder
345//
346 fPythia->SetPARU(58, fPycellThreshold);
347 fPythia->SetPARU(52, fPycellEtSeed);
348 fPythia->SetPARU(53, fPycellMinEtJet);
349 fPythia->SetPARU(54, fPycellMaxRadius);
350 fPythia->SetMSTU(54, 2);
351//
8d2cd130 352// This counts the total number of calls to Pyevnt() per run.
353 fTrialsRun = 0;
354 fQ = 0.;
355 fX1 = 0.;
356 fX2 = 0.;
357 fNev = 0 ;
358//
1d568bc2 359//
360//
8d2cd130 361 AliGenMC::Init();
1d568bc2 362//
363//
364//
365 if (fSetNuclei) {
366 fDyBoost = 0;
367 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
368 }
32d6ef7d 369
370 if (fQuench) {
5fa4b20b 371 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
32d6ef7d 372 }
373
8d2cd130 374}
375
376void AliGenPythia::Generate()
377{
378// Generate one event
e5c87a3d 379
8d2cd130 380 fDecayer->ForceDecay();
381
382 Float_t polar[3] = {0,0,0};
383 Float_t origin[3] = {0,0,0};
a920faf9 384 Float_t p[4];
8d2cd130 385// converts from mm/c to s
386 const Float_t kconv=0.001/2.999792458e8;
387//
388 Int_t nt=0;
389 Int_t jev=0;
390 Int_t j, kf;
391 fTrials=0;
f913ec4f 392 fEventTime = 0.;
393
2590ccf9 394
8d2cd130 395
396 // Set collision vertex position
2590ccf9 397 if (fVertexSmear == kPerEvent) Vertex();
398
8d2cd130 399// event loop
400 while(1)
401 {
32d6ef7d 402//
5fa4b20b 403// Produce event
32d6ef7d 404//
32d6ef7d 405//
5fa4b20b 406// Switch hadronisation off
407//
408 fPythia->SetMSTJ(1, 0);
32d6ef7d 409//
5fa4b20b 410// Either produce new event or read partons from file
411//
412 if (!fReadFromFile) {
413 fPythia->Pyevnt();
414 fNpartons = fPythia->GetN();
415 } else {
416 printf("Loading Event %d\n",AliRunLoader::GetRunLoader()->GetEventNumber());
417 fRL->GetEvent(AliRunLoader::GetRunLoader()->GetEventNumber());
418 fPythia->SetN(0);
419 LoadEvent(fRL->Stack(), 0 , 1);
420 fPythia->Pyedit(21);
421 }
422
32d6ef7d 423//
424// Run quenching routine
425//
5fa4b20b 426 if (fQuench == 1) {
427 fPythia->Quench();
428 } else if (fQuench == 2){
429 fPythia->Pyquen(208., 0, 0.);
430 }
32d6ef7d 431//
5fa4b20b 432// Switch hadronisation on
32d6ef7d 433//
aea21c57 434 fPythia->SetMSTJ(1, 1);
5fa4b20b 435//
436// .. and perform hadronisation
aea21c57 437// printf("Calling hadronisation %d\n", fPythia->GetN());
5fa4b20b 438 fPythia->Pyexec();
8d2cd130 439 fTrials++;
8d2cd130 440 fPythia->ImportParticles(fParticles,"All");
1d568bc2 441 Boost();
8d2cd130 442//
443//
444//
445 Int_t i;
446
5fa4b20b 447
8d2cd130 448 Int_t np = fParticles->GetEntriesFast();
5fa4b20b 449
7c21f297 450 if (np == 0) continue;
8d2cd130 451//
2590ccf9 452
8d2cd130 453//
454 Int_t* pParent = new Int_t[np];
455 Int_t* pSelected = new Int_t[np];
456 Int_t* trackIt = new Int_t[np];
5fa4b20b 457 for (i = 0; i < np; i++) {
8d2cd130 458 pParent[i] = -1;
459 pSelected[i] = 0;
460 trackIt[i] = 0;
461 }
462
463 Int_t nc = 0; // Total n. of selected particles
464 Int_t nParents = 0; // Selected parents
465 Int_t nTkbles = 0; // Trackable particles
466 if (fProcess != kPyMb && fProcess != kPyJets &&
467 fProcess != kPyDirectGamma &&
589380c6 468 fProcess != kPyMbNonDiffr &&
469 fProcess != kPyW) {
8d2cd130 470
5fa4b20b 471 for (i = 0; i < np; i++) {
2590ccf9 472 TParticle* iparticle = (TParticle *) fParticles->At(i);
8d2cd130 473 Int_t ks = iparticle->GetStatusCode();
474 kf = CheckPDGCode(iparticle->GetPdgCode());
475// No initial state partons
476 if (ks==21) continue;
477//
478// Heavy Flavor Selection
479//
480 // quark ?
481 kf = TMath::Abs(kf);
482 Int_t kfl = kf;
9ff6c04c 483 // Resonance
f913ec4f 484
9ff6c04c 485 if (kfl > 100000) kfl %= 100000;
183a5ca9 486 if (kfl > 10000) kfl %= 10000;
8d2cd130 487 // meson ?
488 if (kfl > 10) kfl/=100;
489 // baryon
490 if (kfl > 10) kfl/=10;
8d2cd130 491 Int_t ipa = iparticle->GetFirstMother()-1;
492 Int_t kfMo = 0;
f913ec4f 493//
494// Establish mother daughter relation between heavy quarks and mesons
495//
496 if (kf >= fFlavorSelect && kf <= 6) {
497 Int_t idau = iparticle->GetFirstDaughter() - 1;
498 if (idau > -1) {
499 TParticle* daughter = (TParticle *) fParticles->At(idau);
500 Int_t pdgD = daughter->GetPdgCode();
501 if (pdgD == 91 || pdgD == 92) {
502 Int_t jmin = daughter->GetFirstDaughter() - 1;
503 Int_t jmax = daughter->GetLastDaughter() - 1;
504 for (Int_t j = jmin; j <= jmax; j++)
505 ((TParticle *) fParticles->At(j))->SetFirstMother(i+1);
506 } // is string or cluster
507 } // has daughter
508 } // heavy quark
8d2cd130 509
f913ec4f 510
8d2cd130 511 if (ipa > -1) {
512 TParticle * mother = (TParticle *) fParticles->At(ipa);
513 kfMo = TMath::Abs(mother->GetPdgCode());
514 }
f913ec4f 515
8d2cd130 516 // What to keep in Stack?
517 Bool_t flavorOK = kFALSE;
518 Bool_t selectOK = kFALSE;
519 if (fFeedDownOpt) {
32d6ef7d 520 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
8d2cd130 521 } else {
32d6ef7d 522 if (kfl > fFlavorSelect) {
523 nc = -1;
524 break;
525 }
526 if (kfl == fFlavorSelect) flavorOK = kTRUE;
8d2cd130 527 }
528 switch (fStackFillOpt) {
529 case kFlavorSelection:
32d6ef7d 530 selectOK = kTRUE;
531 break;
8d2cd130 532 case kParentSelection:
32d6ef7d 533 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
534 break;
8d2cd130 535 }
536 if (flavorOK && selectOK) {
537//
538// Heavy flavor hadron or quark
539//
540// Kinematic seletion on final state heavy flavor mesons
541 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
542 {
9ff6c04c 543 continue;
8d2cd130 544 }
545 pSelected[i] = 1;
546 if (ParentSelected(kf)) ++nParents; // Update parent count
547// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
548 } else {
549// Kinematic seletion on decay products
550 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
9ff6c04c 551 && !KinematicSelection(iparticle, 1))
8d2cd130 552 {
9ff6c04c 553 continue;
8d2cd130 554 }
555//
556// Decay products
557// Select if mother was selected and is not tracked
558
559 if (pSelected[ipa] &&
560 !trackIt[ipa] && // mother will be tracked ?
561 kfMo != 5 && // mother is b-quark, don't store fragments
562 kfMo != 4 && // mother is c-quark, don't store fragments
563 kf != 92) // don't store string
564 {
565//
566// Semi-stable or de-selected: diselect decay products:
567//
568//
569 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
570 {
571 Int_t ipF = iparticle->GetFirstDaughter();
572 Int_t ipL = iparticle->GetLastDaughter();
573 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
574 }
575// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
576 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
577 }
578 }
579 if (pSelected[i] == -1) pSelected[i] = 0;
580 if (!pSelected[i]) continue;
581 // Count quarks only if you did not include fragmentation
582 if (fFragmentation && kf <= 10) continue;
9ff6c04c 583
8d2cd130 584 nc++;
585// Decision on tracking
586 trackIt[i] = 0;
587//
588// Track final state particle
589 if (ks == 1) trackIt[i] = 1;
590// Track semi-stable particles
d25cfd65 591 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 592// Track particles selected by process if undecayed.
593 if (fForceDecay == kNoDecay) {
594 if (ParentSelected(kf)) trackIt[i] = 1;
595 } else {
596 if (ParentSelected(kf)) trackIt[i] = 0;
597 }
598 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
599//
600//
601
602 } // particle selection loop
603 if (nc > 0) {
604 for (i = 0; i<np; i++) {
605 if (!pSelected[i]) continue;
606 TParticle * iparticle = (TParticle *) fParticles->At(i);
607 kf = CheckPDGCode(iparticle->GetPdgCode());
608 Int_t ks = iparticle->GetStatusCode();
609 p[0] = iparticle->Px();
610 p[1] = iparticle->Py();
611 p[2] = iparticle->Pz();
a920faf9 612 p[3] = iparticle->Energy();
613
2590ccf9 614 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
615 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
616 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
617
8d2cd130 618 Float_t tof = kconv*iparticle->T();
619 Int_t ipa = iparticle->GetFirstMother()-1;
620 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 621
622 PushTrack(fTrackIt*trackIt[i], iparent, kf,
623 p[0], p[1], p[2], p[3],
624 origin[0], origin[1], origin[2], tof,
625 polar[0], polar[1], polar[2],
626 kPPrimary, nt, 1., ks);
8d2cd130 627 pParent[i] = nt;
628 KeepTrack(nt);
642f15cf 629 } // PushTrack loop
8d2cd130 630 }
631 } else {
632 nc = GenerateMB();
633 } // mb ?
f913ec4f 634
635 GetSubEventTime();
8d2cd130 636
637 if (pParent) delete[] pParent;
638 if (pSelected) delete[] pSelected;
639 if (trackIt) delete[] trackIt;
640
641 if (nc > 0) {
642 switch (fCountMode) {
643 case kCountAll:
644 // printf(" Count all \n");
645 jev += nc;
646 break;
647 case kCountParents:
648 // printf(" Count parents \n");
649 jev += nParents;
650 break;
651 case kCountTrackables:
652 // printf(" Count trackable \n");
653 jev += nTkbles;
654 break;
655 }
656 if (jev >= fNpart || fNpart == -1) {
657 fKineBias=Float_t(fNpart)/Float_t(fTrials);
658 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
659
660 fQ += fPythia->GetVINT(51);
661 fX1 += fPythia->GetVINT(41);
662 fX2 += fPythia->GetVINT(42);
663 fTrialsRun += fTrials;
664 fNev++;
665 MakeHeader();
666 break;
667 }
668 }
669 } // event loop
670 SetHighWaterMark(nt);
671// adjust weight due to kinematic selection
b88f5cea 672// AdjustWeights();
8d2cd130 673// get cross-section
674 fXsection=fPythia->GetPARI(1);
675}
676
677Int_t AliGenPythia::GenerateMB()
678{
679//
680// Min Bias selection and other global selections
681//
682 Int_t i, kf, nt, iparent;
683 Int_t nc = 0;
bf950da8 684 Float_t p[4];
8d2cd130 685 Float_t polar[3] = {0,0,0};
686 Float_t origin[3] = {0,0,0};
687// converts from mm/c to s
688 const Float_t kconv=0.001/2.999792458e8;
689
5fa4b20b 690
691
692 Int_t np = (fHadronisation) ? fParticles->GetEntriesFast() : fNpartons;
aea21c57 693
5fa4b20b 694
8d2cd130 695 Int_t* pParent = new Int_t[np];
696 for (i=0; i< np; i++) pParent[i] = -1;
697 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
698 TParticle* jet1 = (TParticle *) fParticles->At(6);
699 TParticle* jet2 = (TParticle *) fParticles->At(7);
aea21c57 700 if (!CheckTrigger(jet1, jet2)) return 0;
8d2cd130 701 }
702
aea21c57 703
704 //Introducing child cuts in case kPyW
705 if ( (fProcess == kPyW) && (fCutOnChild == 1) ) {
706 if ( !CheckKinematicsOnChild() ) return 0;
707 }
708
709
f913ec4f 710 for (i = 0; i < np; i++) {
8d2cd130 711 Int_t trackIt = 0;
712 TParticle * iparticle = (TParticle *) fParticles->At(i);
713 kf = CheckPDGCode(iparticle->GetPdgCode());
714 Int_t ks = iparticle->GetStatusCode();
715 Int_t km = iparticle->GetFirstMother();
716 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
717 (ks != 1) ||
718 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
719 nc++;
720 if (ks == 1) trackIt = 1;
721 Int_t ipa = iparticle->GetFirstMother()-1;
722
723 iparent = (ipa > -1) ? pParent[ipa] : -1;
724
725//
726// store track information
727 p[0] = iparticle->Px();
728 p[1] = iparticle->Py();
729 p[2] = iparticle->Pz();
a920faf9 730 p[3] = iparticle->Energy();
1406f599 731
a920faf9 732
2590ccf9 733 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
734 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
735 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
736
f913ec4f 737 Float_t tof = fEventTime + kconv * iparticle->T();
a920faf9 738
739 PushTrack(fTrackIt*trackIt, iparent, kf,
740 p[0], p[1], p[2], p[3],
741 origin[0], origin[1], origin[2], tof,
742 polar[0], polar[1], polar[2],
743 kPPrimary, nt, 1., ks);
5fa4b20b 744 //
745 // Special Treatment to store color-flow
746 //
747 if (ks == 3 || ks == 13 || ks == 14) {
748 TParticle* particle = 0;
749 if (fStack) {
750 particle = fStack->Particle(nt);
751 } else {
752 particle = gAlice->Stack()->Particle(nt);
753 }
754 particle->SetFirstDaughter(fPythia->GetK(2, i));
755 particle->SetLastDaughter(fPythia->GetK(3, i));
756 }
757
8d2cd130 758 KeepTrack(nt);
759 pParent[i] = nt;
f913ec4f 760 SetHighWaterMark(nt);
761
8d2cd130 762 } // select particle
763 } // particle loop
764
765 if (pParent) delete[] pParent;
766
767 printf("\n I've put %i particles on the stack \n",nc);
f913ec4f 768 return 1;
8d2cd130 769}
770
771
772void AliGenPythia::FinishRun()
773{
774// Print x-section summary
775 fPythia->Pystat(1);
2779fc64 776
777 if (fNev > 0.) {
778 fQ /= fNev;
779 fX1 /= fNev;
780 fX2 /= fNev;
781 }
782
8d2cd130 783 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
784 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
8d2cd130 785}
786
787void AliGenPythia::AdjustWeights()
788{
789// Adjust the weights after generation of all events
790//
e2bddf81 791 if (gAlice) {
792 TParticle *part;
793 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
794 for (Int_t i=0; i<ntrack; i++) {
795 part= gAlice->GetMCApp()->Particle(i);
796 part->SetWeight(part->GetWeight()*fKineBias);
797 }
8d2cd130 798 }
799}
800
801void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
802{
803// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 804
1a626d4e 805 fAProjectile = a1;
806 fATarget = a2;
1d568bc2 807 fSetNuclei = kTRUE;
8d2cd130 808}
809
810
811void AliGenPythia::MakeHeader()
812{
183a5ca9 813 if (gAlice) {
814 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
f913ec4f 815 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(2);
183a5ca9 816 }
817
8d2cd130 818// Builds the event header, to be called after each event
e5c87a3d 819 if (fHeader) delete fHeader;
820 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 821//
822// Event type
e5c87a3d 823 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 824//
825// Number of trials
e5c87a3d 826 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 827//
828// Event Vertex
d25cfd65 829 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 830//
831// Jets that have triggered
f913ec4f 832
8d2cd130 833 if (fProcess == kPyJets)
834 {
835 Int_t ntrig, njet;
836 Float_t jets[4][10];
837 GetJets(njet, ntrig, jets);
9ff6c04c 838
8d2cd130 839
840 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 841 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 842 jets[3][i]);
843 }
844 }
5fa4b20b 845//
846// Copy relevant information from external header, if present.
847//
848 Float_t uqJet[4];
849
850 if (fRL) {
851 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
852 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
853 {
854 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
855
856
857 exHeader->TriggerJet(i, uqJet);
858 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
859 }
860 }
861//
862// Store quenching parameters
863//
864 if (fQuench){
865 Double_t z[4];
866 Double_t xp, yp;
7c21f297 867 if (fQuench == 1) {
868 // Pythia::Quench()
869 fPythia->GetQuenchingParameters(xp, yp, z);
870 } else {
871 // Pyquen
872 Double_t r1 = PARIMP.rb1;
873 Double_t r2 = PARIMP.rb2;
874 Double_t b = PARIMP.b1;
875 Double_t r = 0.5 * TMath::Sqrt(2. * (r1 * r1 + r2 * r2) - b * b);
876 Double_t phi = PARIMP.psib1;
877 xp = r * TMath::Cos(phi);
878 yp = r * TMath::Sin(phi);
879
880 }
881 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
882 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
883 }
5fa4b20b 884
885//
cf57b268 886// Pass header
5fa4b20b 887//
cf57b268 888 AddHeader(fHeader);
8d2cd130 889}
cf57b268 890
891void AliGenPythia::AddHeader(AliGenEventHeader* header)
892{
893 // Add header to container or runloader
894 if (fContainer) {
895 fContainer->AddHeader(header);
896 } else {
897 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(header);
898 }
899}
900
8d2cd130 901
902Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
903{
904// Check the kinematic trigger condition
905//
906 Double_t eta[2];
907 eta[0] = jet1->Eta();
908 eta[1] = jet2->Eta();
909 Double_t phi[2];
910 phi[0] = jet1->Phi();
911 phi[1] = jet2->Phi();
912 Int_t pdg[2];
913 pdg[0] = jet1->GetPdgCode();
914 pdg[1] = jet2->GetPdgCode();
915 Bool_t triggered = kFALSE;
916
917 if (fProcess == kPyJets) {
918 Int_t njets = 0;
919 Int_t ntrig = 0;
920 Float_t jets[4][10];
921//
922// Use Pythia clustering on parton level to determine jet axis
923//
924 GetJets(njets, ntrig, jets);
925
926 if (ntrig) triggered = kTRUE;
927//
928 } else {
929 Int_t ij = 0;
930 Int_t ig = 1;
931 if (pdg[0] == kGamma) {
932 ij = 1;
933 ig = 0;
934 }
935 //Check eta range first...
936 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
937 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
938 {
939 //Eta is okay, now check phi range
940 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
941 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
942 {
943 triggered = kTRUE;
944 }
945 }
946 }
947 return triggered;
948}
aea21c57 949
950
951//Checking Kinematics on Child (status code 1, particle code ?, kin cuts
952Bool_t AliGenPythia::CheckKinematicsOnChild(){
953
954 Bool_t checking = kFALSE;
955 Int_t j, kcode, ks, km;
956 Int_t nPartAcc = 0; //number of particles in the acceptance range
957 Int_t numberOfAcceptedParticles = 1;
958 if (fNumberOfAcceptedParticles != 0) { numberOfAcceptedParticles = fNumberOfAcceptedParticles; }
959 Int_t npart = fParticles->GetEntriesFast();
960
961 for (j = 0; j<npart; j++) {
962 TParticle * jparticle = (TParticle *) fParticles->At(j);
963 kcode = TMath::Abs( CheckPDGCode(jparticle->GetPdgCode()) );
964 ks = jparticle->GetStatusCode();
965 km = jparticle->GetFirstMother();
966
967 if( (ks == 1) && (kcode == fPdgCodeParticleforAcceptanceCut) && (KinematicSelection(jparticle,1)) ){
968 nPartAcc++;
969 }
970 }
971
972 if( numberOfAcceptedParticles <= nPartAcc){
973 checking = kTRUE;
974 }
975
976 return checking;
977
978}
979
8d2cd130 980
981AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
982{
983// Assignment operator
014a9521 984 rhs.Copy(*this);
8d2cd130 985 return *this;
986}
987
5fa4b20b 988void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
8d2cd130 989{
990//
991// Load event into Pythia Common Block
992//
5fa4b20b 993
32d6ef7d 994 Int_t npart = stack -> GetNprimary();
995 Int_t n0 = 0;
996
997 if (!flag) {
998 (fPythia->GetPyjets())->N = npart;
999 } else {
1000 n0 = (fPythia->GetPyjets())->N;
1001 (fPythia->GetPyjets())->N = n0 + npart;
1002 }
1003
1004
8d2cd130 1005 for (Int_t part = 0; part < npart; part++) {
32d6ef7d 1006 TParticle *MPart = stack->Particle(part);
1007
5fa4b20b 1008 Int_t kf = MPart->GetPdgCode();
1009 Int_t ks = MPart->GetStatusCode();
1010 Int_t idf = MPart->GetFirstDaughter();
1011 Int_t idl = MPart->GetLastDaughter();
1012
1013 if (reHadr) {
1014 if (ks == 11 || ks == 12) {
1015 ks -= 10;
1016 idf = -1;
1017 idl = -1;
1018 }
1019 }
32d6ef7d 1020
8d2cd130 1021 Float_t px = MPart->Px();
1022 Float_t py = MPart->Py();
1023 Float_t pz = MPart->Pz();
1024 Float_t e = MPart->Energy();
a920faf9 1025 Float_t m = MPart->GetCalcMass();
8d2cd130 1026
1027
32d6ef7d 1028 (fPythia->GetPyjets())->P[0][part+n0] = px;
1029 (fPythia->GetPyjets())->P[1][part+n0] = py;
1030 (fPythia->GetPyjets())->P[2][part+n0] = pz;
1031 (fPythia->GetPyjets())->P[3][part+n0] = e;
1032 (fPythia->GetPyjets())->P[4][part+n0] = m;
8d2cd130 1033
32d6ef7d 1034 (fPythia->GetPyjets())->K[1][part+n0] = kf;
1035 (fPythia->GetPyjets())->K[0][part+n0] = ks;
5fa4b20b 1036 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
1037 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
1038 (fPythia->GetPyjets())->K[2][part+n0] = MPart->GetFirstMother() + 1;
8d2cd130 1039 }
1040}
1041
5fa4b20b 1042
014a9521 1043void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 1044{
1045//
1046// Calls the Pythia jet finding algorithm to find jets in the current event
1047//
1048//
8d2cd130 1049//
1050// Save jets
1051 Int_t n = fPythia->GetN();
1052
1053//
1054// Run Jet Finder
1055 fPythia->Pycell(njets);
1056 Int_t i;
1057 for (i = 0; i < njets; i++) {
1058 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1059 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1060 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1061 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1062
1063 jets[0][i] = px;
1064 jets[1][i] = py;
1065 jets[2][i] = pz;
1066 jets[3][i] = e;
1067 }
1068}
1069
1070
1071
1072void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
1073{
1074//
1075// Calls the Pythia clustering algorithm to find jets in the current event
1076//
1077 Int_t n = fPythia->GetN();
1078 nJets = 0;
1079 nJetsTrig = 0;
1080 if (fJetReconstruction == kCluster) {
1081//
1082// Configure cluster algorithm
1083//
1084 fPythia->SetPARU(43, 2.);
1085 fPythia->SetMSTU(41, 1);
1086//
1087// Call cluster algorithm
1088//
1089 fPythia->Pyclus(nJets);
1090//
1091// Loading jets from common block
1092//
1093 } else {
592f8307 1094
8d2cd130 1095//
1096// Run Jet Finder
1097 fPythia->Pycell(nJets);
1098 }
1099
1100 Int_t i;
1101 for (i = 0; i < nJets; i++) {
1102 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1103 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1104 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1105 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1106 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 1107 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 1108 Float_t theta = TMath::ATan2(pt,pz);
1109 Float_t et = e * TMath::Sin(theta);
1110 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
8d2cd130 1111 if (
1112 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 1113 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 1114 et > fEtMinJet && et < fEtMaxJet
1115 )
1116 {
1117 jets[0][nJetsTrig] = px;
1118 jets[1][nJetsTrig] = py;
1119 jets[2][nJetsTrig] = pz;
1120 jets[3][nJetsTrig] = e;
1121 nJetsTrig++;
5fa4b20b 1122// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
8d2cd130 1123 } else {
1124// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
1125 }
1126 }
1127}
1128
f913ec4f 1129void AliGenPythia::GetSubEventTime()
1130{
1131 // Calculates time of the next subevent
9d7108a7 1132 fEventTime = 0.;
1133 if (fEventsTime) {
1134 TArrayF &array = *fEventsTime;
1135 fEventTime = array[fCurSubEvent++];
1136 }
1137 // printf(" Event time: %d %f %p",fCurSubEvent,fEventTime,fEventsTime);
1138 return;
f913ec4f 1139}
8d2cd130 1140
1141#ifdef never
1142void AliGenPythia::Streamer(TBuffer &R__b)
1143{
1144 // Stream an object of class AliGenPythia.
1145
1146 if (R__b.IsReading()) {
1147 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
1148 AliGenerator::Streamer(R__b);
1149 R__b >> (Int_t&)fProcess;
1150 R__b >> (Int_t&)fStrucFunc;
1151 R__b >> (Int_t&)fForceDecay;
1152 R__b >> fEnergyCMS;
1153 R__b >> fKineBias;
1154 R__b >> fTrials;
1155 fParentSelect.Streamer(R__b);
1156 fChildSelect.Streamer(R__b);
1157 R__b >> fXsection;
1158// (AliPythia::Instance())->Streamer(R__b);
1159 R__b >> fPtHardMin;
1160 R__b >> fPtHardMax;
1161// if (fDecayer) fDecayer->Streamer(R__b);
1162 } else {
1163 R__b.WriteVersion(AliGenPythia::IsA());
1164 AliGenerator::Streamer(R__b);
1165 R__b << (Int_t)fProcess;
1166 R__b << (Int_t)fStrucFunc;
1167 R__b << (Int_t)fForceDecay;
1168 R__b << fEnergyCMS;
1169 R__b << fKineBias;
1170 R__b << fTrials;
1171 fParentSelect.Streamer(R__b);
1172 fChildSelect.Streamer(R__b);
1173 R__b << fXsection;
1174// R__b << fPythia;
1175 R__b << fPtHardMin;
1176 R__b << fPtHardMax;
1177 // fDecayer->Streamer(R__b);
1178 }
1179}
1180#endif
1181
90d7b703 1182
589380c6 1183