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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:
0f6ee828 332 case kPyZ:
589380c6 333 break;
8d2cd130 334 }
335//
592f8307 336//
337// JetFinder for Trigger
338//
339// Configure detector (EMCAL like)
340//
341 fPythia->SetPARU(51, fPycellEtaMax);
342 fPythia->SetMSTU(51, fPycellNEta);
343 fPythia->SetMSTU(52, fPycellNPhi);
344//
345// Configure Jet Finder
346//
347 fPythia->SetPARU(58, fPycellThreshold);
348 fPythia->SetPARU(52, fPycellEtSeed);
349 fPythia->SetPARU(53, fPycellMinEtJet);
350 fPythia->SetPARU(54, fPycellMaxRadius);
351 fPythia->SetMSTU(54, 2);
352//
8d2cd130 353// This counts the total number of calls to Pyevnt() per run.
354 fTrialsRun = 0;
355 fQ = 0.;
356 fX1 = 0.;
357 fX2 = 0.;
358 fNev = 0 ;
359//
1d568bc2 360//
361//
8d2cd130 362 AliGenMC::Init();
1d568bc2 363//
364//
365//
366 if (fSetNuclei) {
367 fDyBoost = 0;
368 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
369 }
32d6ef7d 370
371 if (fQuench) {
5fa4b20b 372 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
32d6ef7d 373 }
374
8d2cd130 375}
376
377void AliGenPythia::Generate()
378{
379// Generate one event
e5c87a3d 380
8d2cd130 381 fDecayer->ForceDecay();
382
383 Float_t polar[3] = {0,0,0};
384 Float_t origin[3] = {0,0,0};
a920faf9 385 Float_t p[4];
8d2cd130 386// converts from mm/c to s
387 const Float_t kconv=0.001/2.999792458e8;
388//
389 Int_t nt=0;
390 Int_t jev=0;
391 Int_t j, kf;
392 fTrials=0;
f913ec4f 393 fEventTime = 0.;
394
2590ccf9 395
8d2cd130 396
397 // Set collision vertex position
2590ccf9 398 if (fVertexSmear == kPerEvent) Vertex();
399
8d2cd130 400// event loop
401 while(1)
402 {
32d6ef7d 403//
5fa4b20b 404// Produce event
32d6ef7d 405//
32d6ef7d 406//
5fa4b20b 407// Switch hadronisation off
408//
409 fPythia->SetMSTJ(1, 0);
32d6ef7d 410//
5fa4b20b 411// Either produce new event or read partons from file
412//
413 if (!fReadFromFile) {
414 fPythia->Pyevnt();
415 fNpartons = fPythia->GetN();
416 } else {
417 printf("Loading Event %d\n",AliRunLoader::GetRunLoader()->GetEventNumber());
418 fRL->GetEvent(AliRunLoader::GetRunLoader()->GetEventNumber());
419 fPythia->SetN(0);
420 LoadEvent(fRL->Stack(), 0 , 1);
421 fPythia->Pyedit(21);
422 }
423
32d6ef7d 424//
425// Run quenching routine
426//
5fa4b20b 427 if (fQuench == 1) {
428 fPythia->Quench();
429 } else if (fQuench == 2){
430 fPythia->Pyquen(208., 0, 0.);
431 }
32d6ef7d 432//
5fa4b20b 433// Switch hadronisation on
32d6ef7d 434//
aea21c57 435 fPythia->SetMSTJ(1, 1);
5fa4b20b 436//
437// .. and perform hadronisation
aea21c57 438// printf("Calling hadronisation %d\n", fPythia->GetN());
5fa4b20b 439 fPythia->Pyexec();
8d2cd130 440 fTrials++;
8d2cd130 441 fPythia->ImportParticles(fParticles,"All");
1d568bc2 442 Boost();
8d2cd130 443//
444//
445//
446 Int_t i;
447
5fa4b20b 448
8d2cd130 449 Int_t np = fParticles->GetEntriesFast();
5fa4b20b 450
7c21f297 451 if (np == 0) continue;
8d2cd130 452//
2590ccf9 453
8d2cd130 454//
455 Int_t* pParent = new Int_t[np];
456 Int_t* pSelected = new Int_t[np];
457 Int_t* trackIt = new Int_t[np];
5fa4b20b 458 for (i = 0; i < np; i++) {
8d2cd130 459 pParent[i] = -1;
460 pSelected[i] = 0;
461 trackIt[i] = 0;
462 }
463
464 Int_t nc = 0; // Total n. of selected particles
465 Int_t nParents = 0; // Selected parents
466 Int_t nTkbles = 0; // Trackable particles
467 if (fProcess != kPyMb && fProcess != kPyJets &&
468 fProcess != kPyDirectGamma &&
589380c6 469 fProcess != kPyMbNonDiffr &&
0f6ee828 470 fProcess != kPyW && fProcess != kPyZ ) {
8d2cd130 471
5fa4b20b 472 for (i = 0; i < np; i++) {
2590ccf9 473 TParticle* iparticle = (TParticle *) fParticles->At(i);
8d2cd130 474 Int_t ks = iparticle->GetStatusCode();
475 kf = CheckPDGCode(iparticle->GetPdgCode());
476// No initial state partons
477 if (ks==21) continue;
478//
479// Heavy Flavor Selection
480//
481 // quark ?
482 kf = TMath::Abs(kf);
483 Int_t kfl = kf;
9ff6c04c 484 // Resonance
f913ec4f 485
9ff6c04c 486 if (kfl > 100000) kfl %= 100000;
183a5ca9 487 if (kfl > 10000) kfl %= 10000;
8d2cd130 488 // meson ?
489 if (kfl > 10) kfl/=100;
490 // baryon
491 if (kfl > 10) kfl/=10;
8d2cd130 492 Int_t ipa = iparticle->GetFirstMother()-1;
493 Int_t kfMo = 0;
f913ec4f 494//
495// Establish mother daughter relation between heavy quarks and mesons
496//
497 if (kf >= fFlavorSelect && kf <= 6) {
498 Int_t idau = iparticle->GetFirstDaughter() - 1;
499 if (idau > -1) {
500 TParticle* daughter = (TParticle *) fParticles->At(idau);
501 Int_t pdgD = daughter->GetPdgCode();
502 if (pdgD == 91 || pdgD == 92) {
503 Int_t jmin = daughter->GetFirstDaughter() - 1;
504 Int_t jmax = daughter->GetLastDaughter() - 1;
505 for (Int_t j = jmin; j <= jmax; j++)
506 ((TParticle *) fParticles->At(j))->SetFirstMother(i+1);
507 } // is string or cluster
508 } // has daughter
509 } // heavy quark
8d2cd130 510
f913ec4f 511
8d2cd130 512 if (ipa > -1) {
513 TParticle * mother = (TParticle *) fParticles->At(ipa);
514 kfMo = TMath::Abs(mother->GetPdgCode());
515 }
f913ec4f 516
8d2cd130 517 // What to keep in Stack?
518 Bool_t flavorOK = kFALSE;
519 Bool_t selectOK = kFALSE;
520 if (fFeedDownOpt) {
32d6ef7d 521 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
8d2cd130 522 } else {
32d6ef7d 523 if (kfl > fFlavorSelect) {
524 nc = -1;
525 break;
526 }
527 if (kfl == fFlavorSelect) flavorOK = kTRUE;
8d2cd130 528 }
529 switch (fStackFillOpt) {
530 case kFlavorSelection:
32d6ef7d 531 selectOK = kTRUE;
532 break;
8d2cd130 533 case kParentSelection:
32d6ef7d 534 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
535 break;
8d2cd130 536 }
537 if (flavorOK && selectOK) {
538//
539// Heavy flavor hadron or quark
540//
541// Kinematic seletion on final state heavy flavor mesons
542 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
543 {
9ff6c04c 544 continue;
8d2cd130 545 }
546 pSelected[i] = 1;
547 if (ParentSelected(kf)) ++nParents; // Update parent count
548// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
549 } else {
550// Kinematic seletion on decay products
551 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
9ff6c04c 552 && !KinematicSelection(iparticle, 1))
8d2cd130 553 {
9ff6c04c 554 continue;
8d2cd130 555 }
556//
557// Decay products
558// Select if mother was selected and is not tracked
559
560 if (pSelected[ipa] &&
561 !trackIt[ipa] && // mother will be tracked ?
562 kfMo != 5 && // mother is b-quark, don't store fragments
563 kfMo != 4 && // mother is c-quark, don't store fragments
564 kf != 92) // don't store string
565 {
566//
567// Semi-stable or de-selected: diselect decay products:
568//
569//
570 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
571 {
572 Int_t ipF = iparticle->GetFirstDaughter();
573 Int_t ipL = iparticle->GetLastDaughter();
574 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
575 }
576// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
577 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
578 }
579 }
580 if (pSelected[i] == -1) pSelected[i] = 0;
581 if (!pSelected[i]) continue;
582 // Count quarks only if you did not include fragmentation
583 if (fFragmentation && kf <= 10) continue;
9ff6c04c 584
8d2cd130 585 nc++;
586// Decision on tracking
587 trackIt[i] = 0;
588//
589// Track final state particle
590 if (ks == 1) trackIt[i] = 1;
591// Track semi-stable particles
d25cfd65 592 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 593// Track particles selected by process if undecayed.
594 if (fForceDecay == kNoDecay) {
595 if (ParentSelected(kf)) trackIt[i] = 1;
596 } else {
597 if (ParentSelected(kf)) trackIt[i] = 0;
598 }
599 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
600//
601//
602
603 } // particle selection loop
604 if (nc > 0) {
605 for (i = 0; i<np; i++) {
606 if (!pSelected[i]) continue;
607 TParticle * iparticle = (TParticle *) fParticles->At(i);
608 kf = CheckPDGCode(iparticle->GetPdgCode());
609 Int_t ks = iparticle->GetStatusCode();
610 p[0] = iparticle->Px();
611 p[1] = iparticle->Py();
612 p[2] = iparticle->Pz();
a920faf9 613 p[3] = iparticle->Energy();
614
2590ccf9 615 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
616 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
617 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
618
8d2cd130 619 Float_t tof = kconv*iparticle->T();
620 Int_t ipa = iparticle->GetFirstMother()-1;
621 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 622
623 PushTrack(fTrackIt*trackIt[i], iparent, kf,
624 p[0], p[1], p[2], p[3],
625 origin[0], origin[1], origin[2], tof,
626 polar[0], polar[1], polar[2],
627 kPPrimary, nt, 1., ks);
8d2cd130 628 pParent[i] = nt;
629 KeepTrack(nt);
642f15cf 630 } // PushTrack loop
8d2cd130 631 }
632 } else {
633 nc = GenerateMB();
634 } // mb ?
f913ec4f 635
636 GetSubEventTime();
8d2cd130 637
638 if (pParent) delete[] pParent;
639 if (pSelected) delete[] pSelected;
640 if (trackIt) delete[] trackIt;
641
642 if (nc > 0) {
643 switch (fCountMode) {
644 case kCountAll:
645 // printf(" Count all \n");
646 jev += nc;
647 break;
648 case kCountParents:
649 // printf(" Count parents \n");
650 jev += nParents;
651 break;
652 case kCountTrackables:
653 // printf(" Count trackable \n");
654 jev += nTkbles;
655 break;
656 }
657 if (jev >= fNpart || fNpart == -1) {
658 fKineBias=Float_t(fNpart)/Float_t(fTrials);
659 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
660
661 fQ += fPythia->GetVINT(51);
662 fX1 += fPythia->GetVINT(41);
663 fX2 += fPythia->GetVINT(42);
664 fTrialsRun += fTrials;
665 fNev++;
666 MakeHeader();
667 break;
668 }
669 }
670 } // event loop
671 SetHighWaterMark(nt);
672// adjust weight due to kinematic selection
b88f5cea 673// AdjustWeights();
8d2cd130 674// get cross-section
675 fXsection=fPythia->GetPARI(1);
676}
677
678Int_t AliGenPythia::GenerateMB()
679{
680//
681// Min Bias selection and other global selections
682//
683 Int_t i, kf, nt, iparent;
684 Int_t nc = 0;
bf950da8 685 Float_t p[4];
8d2cd130 686 Float_t polar[3] = {0,0,0};
687 Float_t origin[3] = {0,0,0};
688// converts from mm/c to s
689 const Float_t kconv=0.001/2.999792458e8;
690
5fa4b20b 691
692
693 Int_t np = (fHadronisation) ? fParticles->GetEntriesFast() : fNpartons;
aea21c57 694
5fa4b20b 695
8d2cd130 696 Int_t* pParent = new Int_t[np];
697 for (i=0; i< np; i++) pParent[i] = -1;
698 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
699 TParticle* jet1 = (TParticle *) fParticles->At(6);
700 TParticle* jet2 = (TParticle *) fParticles->At(7);
aea21c57 701 if (!CheckTrigger(jet1, jet2)) return 0;
8d2cd130 702 }
703
aea21c57 704
0f6ee828 705 //Introducing child cuts in case kPyW, kPyZ, kPyMb, and kPyMbNonDiff
706 if ( (fProcess == kPyW || fProcess == kPyZ || fProcess == kPyMb || fProcess == kPyMbNonDiffr)
707 && (fCutOnChild == 1) ) {
708 if ( !CheckKinematicsOnChild() ) {
709 if (pParent) delete[] pParent;
710 return 0;
711 }
aea21c57 712 }
713
714
f913ec4f 715 for (i = 0; i < np; i++) {
8d2cd130 716 Int_t trackIt = 0;
717 TParticle * iparticle = (TParticle *) fParticles->At(i);
718 kf = CheckPDGCode(iparticle->GetPdgCode());
719 Int_t ks = iparticle->GetStatusCode();
720 Int_t km = iparticle->GetFirstMother();
721 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
722 (ks != 1) ||
723 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
724 nc++;
725 if (ks == 1) trackIt = 1;
726 Int_t ipa = iparticle->GetFirstMother()-1;
727
728 iparent = (ipa > -1) ? pParent[ipa] : -1;
729
730//
731// store track information
732 p[0] = iparticle->Px();
733 p[1] = iparticle->Py();
734 p[2] = iparticle->Pz();
a920faf9 735 p[3] = iparticle->Energy();
1406f599 736
a920faf9 737
2590ccf9 738 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
739 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
740 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
741
f913ec4f 742 Float_t tof = fEventTime + kconv * iparticle->T();
a920faf9 743
744 PushTrack(fTrackIt*trackIt, iparent, kf,
745 p[0], p[1], p[2], p[3],
746 origin[0], origin[1], origin[2], tof,
747 polar[0], polar[1], polar[2],
748 kPPrimary, nt, 1., ks);
5fa4b20b 749 //
750 // Special Treatment to store color-flow
751 //
752 if (ks == 3 || ks == 13 || ks == 14) {
753 TParticle* particle = 0;
754 if (fStack) {
755 particle = fStack->Particle(nt);
756 } else {
757 particle = gAlice->Stack()->Particle(nt);
758 }
759 particle->SetFirstDaughter(fPythia->GetK(2, i));
760 particle->SetLastDaughter(fPythia->GetK(3, i));
761 }
762
8d2cd130 763 KeepTrack(nt);
764 pParent[i] = nt;
f913ec4f 765 SetHighWaterMark(nt);
766
8d2cd130 767 } // select particle
768 } // particle loop
769
770 if (pParent) delete[] pParent;
771
772 printf("\n I've put %i particles on the stack \n",nc);
f913ec4f 773 return 1;
8d2cd130 774}
775
776
777void AliGenPythia::FinishRun()
778{
779// Print x-section summary
780 fPythia->Pystat(1);
2779fc64 781
782 if (fNev > 0.) {
783 fQ /= fNev;
784 fX1 /= fNev;
785 fX2 /= fNev;
786 }
787
8d2cd130 788 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
789 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
8d2cd130 790}
791
792void AliGenPythia::AdjustWeights()
793{
794// Adjust the weights after generation of all events
795//
e2bddf81 796 if (gAlice) {
797 TParticle *part;
798 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
799 for (Int_t i=0; i<ntrack; i++) {
800 part= gAlice->GetMCApp()->Particle(i);
801 part->SetWeight(part->GetWeight()*fKineBias);
802 }
8d2cd130 803 }
804}
805
806void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
807{
808// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 809
1a626d4e 810 fAProjectile = a1;
811 fATarget = a2;
1d568bc2 812 fSetNuclei = kTRUE;
8d2cd130 813}
814
815
816void AliGenPythia::MakeHeader()
817{
183a5ca9 818 if (gAlice) {
819 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
f913ec4f 820 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(2);
183a5ca9 821 }
822
8d2cd130 823// Builds the event header, to be called after each event
e5c87a3d 824 if (fHeader) delete fHeader;
825 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 826//
827// Event type
e5c87a3d 828 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 829//
830// Number of trials
e5c87a3d 831 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 832//
833// Event Vertex
d25cfd65 834 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 835//
836// Jets that have triggered
f913ec4f 837
8d2cd130 838 if (fProcess == kPyJets)
839 {
840 Int_t ntrig, njet;
841 Float_t jets[4][10];
842 GetJets(njet, ntrig, jets);
9ff6c04c 843
8d2cd130 844
845 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 846 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 847 jets[3][i]);
848 }
849 }
5fa4b20b 850//
851// Copy relevant information from external header, if present.
852//
853 Float_t uqJet[4];
854
855 if (fRL) {
856 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
857 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
858 {
859 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
860
861
862 exHeader->TriggerJet(i, uqJet);
863 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
864 }
865 }
866//
867// Store quenching parameters
868//
869 if (fQuench){
870 Double_t z[4];
871 Double_t xp, yp;
7c21f297 872 if (fQuench == 1) {
873 // Pythia::Quench()
874 fPythia->GetQuenchingParameters(xp, yp, z);
875 } else {
876 // Pyquen
877 Double_t r1 = PARIMP.rb1;
878 Double_t r2 = PARIMP.rb2;
879 Double_t b = PARIMP.b1;
880 Double_t r = 0.5 * TMath::Sqrt(2. * (r1 * r1 + r2 * r2) - b * b);
881 Double_t phi = PARIMP.psib1;
882 xp = r * TMath::Cos(phi);
883 yp = r * TMath::Sin(phi);
884
885 }
886 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
887 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
888 }
5fa4b20b 889
890//
cf57b268 891// Pass header
5fa4b20b 892//
cf57b268 893 AddHeader(fHeader);
8d2cd130 894}
cf57b268 895
896void AliGenPythia::AddHeader(AliGenEventHeader* header)
897{
898 // Add header to container or runloader
899 if (fContainer) {
900 fContainer->AddHeader(header);
901 } else {
902 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(header);
903 }
904}
905
8d2cd130 906
907Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
908{
909// Check the kinematic trigger condition
910//
911 Double_t eta[2];
912 eta[0] = jet1->Eta();
913 eta[1] = jet2->Eta();
914 Double_t phi[2];
915 phi[0] = jet1->Phi();
916 phi[1] = jet2->Phi();
917 Int_t pdg[2];
918 pdg[0] = jet1->GetPdgCode();
919 pdg[1] = jet2->GetPdgCode();
920 Bool_t triggered = kFALSE;
921
922 if (fProcess == kPyJets) {
923 Int_t njets = 0;
924 Int_t ntrig = 0;
925 Float_t jets[4][10];
926//
927// Use Pythia clustering on parton level to determine jet axis
928//
929 GetJets(njets, ntrig, jets);
930
931 if (ntrig) triggered = kTRUE;
932//
933 } else {
934 Int_t ij = 0;
935 Int_t ig = 1;
936 if (pdg[0] == kGamma) {
937 ij = 1;
938 ig = 0;
939 }
940 //Check eta range first...
941 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
942 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
943 {
944 //Eta is okay, now check phi range
945 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
946 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
947 {
948 triggered = kTRUE;
949 }
950 }
951 }
952 return triggered;
953}
aea21c57 954
955
956//Checking Kinematics on Child (status code 1, particle code ?, kin cuts
957Bool_t AliGenPythia::CheckKinematicsOnChild(){
958
959 Bool_t checking = kFALSE;
960 Int_t j, kcode, ks, km;
961 Int_t nPartAcc = 0; //number of particles in the acceptance range
962 Int_t numberOfAcceptedParticles = 1;
963 if (fNumberOfAcceptedParticles != 0) { numberOfAcceptedParticles = fNumberOfAcceptedParticles; }
964 Int_t npart = fParticles->GetEntriesFast();
965
0f6ee828 966 for (j = 0; j<npart; j++) {
aea21c57 967 TParticle * jparticle = (TParticle *) fParticles->At(j);
968 kcode = TMath::Abs( CheckPDGCode(jparticle->GetPdgCode()) );
969 ks = jparticle->GetStatusCode();
970 km = jparticle->GetFirstMother();
971
972 if( (ks == 1) && (kcode == fPdgCodeParticleforAcceptanceCut) && (KinematicSelection(jparticle,1)) ){
973 nPartAcc++;
974 }
0f6ee828 975 if( numberOfAcceptedParticles <= nPartAcc){
976 checking = kTRUE;
977 break;
978 }
aea21c57 979 }
0f6ee828 980
aea21c57 981 return checking;
aea21c57 982}
983
8d2cd130 984
985AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
986{
987// Assignment operator
014a9521 988 rhs.Copy(*this);
8d2cd130 989 return *this;
990}
991
5fa4b20b 992void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
8d2cd130 993{
994//
995// Load event into Pythia Common Block
996//
5fa4b20b 997
32d6ef7d 998 Int_t npart = stack -> GetNprimary();
999 Int_t n0 = 0;
1000
1001 if (!flag) {
1002 (fPythia->GetPyjets())->N = npart;
1003 } else {
1004 n0 = (fPythia->GetPyjets())->N;
1005 (fPythia->GetPyjets())->N = n0 + npart;
1006 }
1007
1008
8d2cd130 1009 for (Int_t part = 0; part < npart; part++) {
32d6ef7d 1010 TParticle *MPart = stack->Particle(part);
1011
5fa4b20b 1012 Int_t kf = MPart->GetPdgCode();
1013 Int_t ks = MPart->GetStatusCode();
1014 Int_t idf = MPart->GetFirstDaughter();
1015 Int_t idl = MPart->GetLastDaughter();
1016
1017 if (reHadr) {
1018 if (ks == 11 || ks == 12) {
1019 ks -= 10;
1020 idf = -1;
1021 idl = -1;
1022 }
1023 }
32d6ef7d 1024
8d2cd130 1025 Float_t px = MPart->Px();
1026 Float_t py = MPart->Py();
1027 Float_t pz = MPart->Pz();
1028 Float_t e = MPart->Energy();
a920faf9 1029 Float_t m = MPart->GetCalcMass();
8d2cd130 1030
1031
32d6ef7d 1032 (fPythia->GetPyjets())->P[0][part+n0] = px;
1033 (fPythia->GetPyjets())->P[1][part+n0] = py;
1034 (fPythia->GetPyjets())->P[2][part+n0] = pz;
1035 (fPythia->GetPyjets())->P[3][part+n0] = e;
1036 (fPythia->GetPyjets())->P[4][part+n0] = m;
8d2cd130 1037
32d6ef7d 1038 (fPythia->GetPyjets())->K[1][part+n0] = kf;
1039 (fPythia->GetPyjets())->K[0][part+n0] = ks;
5fa4b20b 1040 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
1041 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
1042 (fPythia->GetPyjets())->K[2][part+n0] = MPart->GetFirstMother() + 1;
8d2cd130 1043 }
1044}
1045
5fa4b20b 1046
014a9521 1047void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 1048{
1049//
1050// Calls the Pythia jet finding algorithm to find jets in the current event
1051//
1052//
8d2cd130 1053//
1054// Save jets
1055 Int_t n = fPythia->GetN();
1056
1057//
1058// Run Jet Finder
1059 fPythia->Pycell(njets);
1060 Int_t i;
1061 for (i = 0; i < njets; i++) {
1062 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1063 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1064 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1065 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1066
1067 jets[0][i] = px;
1068 jets[1][i] = py;
1069 jets[2][i] = pz;
1070 jets[3][i] = e;
1071 }
1072}
1073
1074
1075
1076void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
1077{
1078//
1079// Calls the Pythia clustering algorithm to find jets in the current event
1080//
1081 Int_t n = fPythia->GetN();
1082 nJets = 0;
1083 nJetsTrig = 0;
1084 if (fJetReconstruction == kCluster) {
1085//
1086// Configure cluster algorithm
1087//
1088 fPythia->SetPARU(43, 2.);
1089 fPythia->SetMSTU(41, 1);
1090//
1091// Call cluster algorithm
1092//
1093 fPythia->Pyclus(nJets);
1094//
1095// Loading jets from common block
1096//
1097 } else {
592f8307 1098
8d2cd130 1099//
1100// Run Jet Finder
1101 fPythia->Pycell(nJets);
1102 }
1103
1104 Int_t i;
1105 for (i = 0; i < nJets; i++) {
1106 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1107 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1108 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1109 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1110 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 1111 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 1112 Float_t theta = TMath::ATan2(pt,pz);
1113 Float_t et = e * TMath::Sin(theta);
1114 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
8d2cd130 1115 if (
1116 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 1117 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 1118 et > fEtMinJet && et < fEtMaxJet
1119 )
1120 {
1121 jets[0][nJetsTrig] = px;
1122 jets[1][nJetsTrig] = py;
1123 jets[2][nJetsTrig] = pz;
1124 jets[3][nJetsTrig] = e;
1125 nJetsTrig++;
5fa4b20b 1126// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
8d2cd130 1127 } else {
1128// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
1129 }
1130 }
1131}
1132
f913ec4f 1133void AliGenPythia::GetSubEventTime()
1134{
1135 // Calculates time of the next subevent
9d7108a7 1136 fEventTime = 0.;
1137 if (fEventsTime) {
1138 TArrayF &array = *fEventsTime;
1139 fEventTime = array[fCurSubEvent++];
1140 }
1141 // printf(" Event time: %d %f %p",fCurSubEvent,fEventTime,fEventsTime);
1142 return;
f913ec4f 1143}
8d2cd130 1144
1145#ifdef never
1146void AliGenPythia::Streamer(TBuffer &R__b)
1147{
1148 // Stream an object of class AliGenPythia.
1149
1150 if (R__b.IsReading()) {
1151 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
1152 AliGenerator::Streamer(R__b);
1153 R__b >> (Int_t&)fProcess;
1154 R__b >> (Int_t&)fStrucFunc;
1155 R__b >> (Int_t&)fForceDecay;
1156 R__b >> fEnergyCMS;
1157 R__b >> fKineBias;
1158 R__b >> fTrials;
1159 fParentSelect.Streamer(R__b);
1160 fChildSelect.Streamer(R__b);
1161 R__b >> fXsection;
1162// (AliPythia::Instance())->Streamer(R__b);
1163 R__b >> fPtHardMin;
1164 R__b >> fPtHardMax;
1165// if (fDecayer) fDecayer->Streamer(R__b);
1166 } else {
1167 R__b.WriteVersion(AliGenPythia::IsA());
1168 AliGenerator::Streamer(R__b);
1169 R__b << (Int_t)fProcess;
1170 R__b << (Int_t)fStrucFunc;
1171 R__b << (Int_t)fForceDecay;
1172 R__b << fEnergyCMS;
1173 R__b << fKineBias;
1174 R__b << fTrials;
1175 fParentSelect.Streamer(R__b);
1176 fChildSelect.Streamer(R__b);
1177 R__b << fXsection;
1178// R__b << fPythia;
1179 R__b << fPtHardMin;
1180 R__b << fPtHardMax;
1181 // fDecayer->Streamer(R__b);
1182 }
1183}
1184#endif
1185
90d7b703 1186
589380c6 1187