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8d2cd130 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
7cdba479 16/* $Id$ */
8d2cd130 17
18//
19// Generator using the TPythia interface (via AliPythia)
20// to generate pp collisions.
21// Using SetNuclei() also nuclear modifications to the structure functions
22// can be taken into account. This makes, of course, only sense for the
23// generation of the products of hard processes (heavy flavor, jets ...)
24//
25// andreas.morsch@cern.ch
26//
27
28#include <TDatabasePDG.h>
29#include <TParticle.h>
30#include <TPDGCode.h>
31#include <TSystem.h>
32#include <TTree.h>
33
34#include "AliConst.h"
35#include "AliDecayerPythia.h"
36#include "AliGenPythia.h"
5fa4b20b 37#include "AliHeader.h"
8d2cd130 38#include "AliGenPythiaEventHeader.h"
39#include "AliPythia.h"
7cdba479 40#include "AliPythiaRndm.h"
8d2cd130 41#include "AliRun.h"
7ea3ea5b 42#include "AliStack.h"
43#include "AliRunLoader.h"
5d12ce38 44#include "AliMC.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;
8d2cd130 55 fDecayer = new AliDecayerPythia();
56 SetEventListRange();
57 SetJetPhiRange();
58 SetJetEtaRange();
59 SetJetEtRange();
60 SetGammaPhiRange();
61 SetGammaEtaRange();
62 SetPtKick();
7ea3ea5b 63 SetQuench();
5fa4b20b 64 SetHadronisation();
1d568bc2 65 fSetNuclei = kFALSE;
7cdba479 66 if (!AliPythiaRndm::GetPythiaRandom())
67 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 68}
69
70AliGenPythia::AliGenPythia(Int_t npart)
71 :AliGenMC(npart)
72{
73// default charm production at 5. 5 TeV
74// semimuonic decay
75// structure function GRVHO
76//
77 fName = "Pythia";
78 fTitle= "Particle Generator using PYTHIA";
79 fXsection = 0.;
8d2cd130 80 SetProcess();
81 SetStrucFunc();
82 SetForceDecay();
83 SetPtHard();
84 SetYHard();
85 SetEnergyCMS();
86 fDecayer = new AliDecayerPythia();
87 // Set random number generator
7cdba479 88 if (!AliPythiaRndm::GetPythiaRandom())
89 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 90 fFlavorSelect = 0;
91 // Produced particles
92 fParticles = new TClonesArray("TParticle",1000);
e5c87a3d 93 fHeader = 0;
8d2cd130 94 SetEventListRange();
95 SetJetPhiRange();
96 SetJetEtaRange();
97 SetJetEtRange();
98 SetGammaPhiRange();
99 SetGammaEtaRange();
100 SetJetReconstructionMode();
7ea3ea5b 101 SetQuench();
5fa4b20b 102 SetHadronisation();
8d2cd130 103 SetPtKick();
104 // Options determining what to keep in the stack (Heavy flavour generation)
105 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
106 fFeedDownOpt = kTRUE; // allow feed down from higher family
107 // Fragmentation on/off
108 fFragmentation = kTRUE;
109 // Default counting mode
110 fCountMode = kCountAll;
592f8307 111 // Pycel
112 SetPycellParameters();
1d568bc2 113 fSetNuclei = kFALSE;
8d2cd130 114}
115
116AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
f936b8ea 117 :AliGenMC(Pythia)
8d2cd130 118{
119// copy constructor
120 Pythia.Copy(*this);
121}
122
123AliGenPythia::~AliGenPythia()
124{
125// Destructor
126}
127
592f8307 128void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
129 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
130{
131// Set pycell parameters
132 fPycellEtaMax = etamax;
133 fPycellNEta = neta;
134 fPycellNPhi = nphi;
135 fPycellThreshold = thresh;
136 fPycellEtSeed = etseed;
137 fPycellMinEtJet = minet;
138 fPycellMaxRadius = r;
139}
140
141
142
8d2cd130 143void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
144{
145 // Set a range of event numbers, for which a table
146 // of generated particle will be printed
147 fDebugEventFirst = eventFirst;
148 fDebugEventLast = eventLast;
149 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
150}
151
152void AliGenPythia::Init()
153{
154// Initialisation
155
156 SetMC(AliPythia::Instance());
b88f5cea 157 fPythia=(AliPythia*) fMCEvGen;
e2bddf81 158
8d2cd130 159//
160 fParentWeight=1./Float_t(fNpart);
161//
162// Forward Paramters to the AliPythia object
163 fDecayer->SetForceDecay(fForceDecay);
164 fDecayer->Init();
165
166
167 fPythia->SetCKIN(3,fPtHardMin);
168 fPythia->SetCKIN(4,fPtHardMax);
169 fPythia->SetCKIN(7,fYHardMin);
170 fPythia->SetCKIN(8,fYHardMax);
171
1a626d4e 172 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
8d2cd130 173 // Fragmentation?
174 if (fFragmentation) {
175 fPythia->SetMSTP(111,1);
176 } else {
177 fPythia->SetMSTP(111,0);
178 }
179
180
181// initial state radiation
182 fPythia->SetMSTP(61,fGinit);
183// final state radiation
184 fPythia->SetMSTP(71,fGfinal);
185// pt - kick
186 if (fPtKick > 0.) {
187 fPythia->SetMSTP(91,1);
188 fPythia->SetPARP(91,fPtKick);
189 } else {
190 fPythia->SetMSTP(91,0);
191 }
192
5fa4b20b 193
194 if (fReadFromFile) {
195 fRL = AliRunLoader::Open(fFileName, "Partons");
196 fRL->LoadKinematics();
197 fRL->LoadHeader();
198 } else {
199 fRL = 0x0;
200 }
201
202
8d2cd130 203 //
204 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
205
206// Parent and Children Selection
207 switch (fProcess)
208 {
209 case kPyCharm:
210 case kPyCharmUnforced:
adf4d898 211 case kPyCharmPbPbMNR:
aabc7187 212 case kPyCharmppMNR:
213 case kPyCharmpPbMNR:
8d2cd130 214 fParentSelect[0] = 411;
215 fParentSelect[1] = 421;
216 fParentSelect[2] = 431;
217 fParentSelect[3] = 4122;
218 fFlavorSelect = 4;
219 break;
adf4d898 220 case kPyD0PbPbMNR:
221 case kPyD0pPbMNR:
222 case kPyD0ppMNR:
8d2cd130 223 fParentSelect[0] = 421;
224 fFlavorSelect = 4;
225 break;
90d7b703 226 case kPyDPlusPbPbMNR:
227 case kPyDPluspPbMNR:
228 case kPyDPlusppMNR:
229 fParentSelect[0] = 411;
230 fFlavorSelect = 4;
231 break;
8d2cd130 232 case kPyBeauty:
adf4d898 233 case kPyBeautyPbPbMNR:
234 case kPyBeautypPbMNR:
235 case kPyBeautyppMNR:
8d2cd130 236 fParentSelect[0]= 511;
237 fParentSelect[1]= 521;
238 fParentSelect[2]= 531;
239 fParentSelect[3]= 5122;
240 fParentSelect[4]= 5132;
241 fParentSelect[5]= 5232;
242 fParentSelect[6]= 5332;
243 fFlavorSelect = 5;
244 break;
245 case kPyBeautyUnforced:
246 fParentSelect[0] = 511;
247 fParentSelect[1] = 521;
248 fParentSelect[2] = 531;
249 fParentSelect[3] = 5122;
250 fParentSelect[4] = 5132;
251 fParentSelect[5] = 5232;
252 fParentSelect[6] = 5332;
253 fFlavorSelect = 5;
254 break;
255 case kPyJpsiChi:
256 case kPyJpsi:
257 fParentSelect[0] = 443;
258 break;
259 case kPyMb:
260 case kPyMbNonDiffr:
261 case kPyJets:
262 case kPyDirectGamma:
263 break;
264 }
265//
592f8307 266//
267// JetFinder for Trigger
268//
269// Configure detector (EMCAL like)
270//
271 fPythia->SetPARU(51, fPycellEtaMax);
272 fPythia->SetMSTU(51, fPycellNEta);
273 fPythia->SetMSTU(52, fPycellNPhi);
274//
275// Configure Jet Finder
276//
277 fPythia->SetPARU(58, fPycellThreshold);
278 fPythia->SetPARU(52, fPycellEtSeed);
279 fPythia->SetPARU(53, fPycellMinEtJet);
280 fPythia->SetPARU(54, fPycellMaxRadius);
281 fPythia->SetMSTU(54, 2);
282//
8d2cd130 283// This counts the total number of calls to Pyevnt() per run.
284 fTrialsRun = 0;
285 fQ = 0.;
286 fX1 = 0.;
287 fX2 = 0.;
288 fNev = 0 ;
289//
1d568bc2 290//
291//
8d2cd130 292 AliGenMC::Init();
1d568bc2 293//
294//
295//
296 if (fSetNuclei) {
297 fDyBoost = 0;
298 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
299 }
32d6ef7d 300
301 if (fQuench) {
5fa4b20b 302 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
32d6ef7d 303 }
304
8d2cd130 305}
306
307void AliGenPythia::Generate()
308{
309// Generate one event
e5c87a3d 310
8d2cd130 311 fDecayer->ForceDecay();
312
313 Float_t polar[3] = {0,0,0};
314 Float_t origin[3] = {0,0,0};
a920faf9 315 Float_t p[4];
8d2cd130 316// converts from mm/c to s
317 const Float_t kconv=0.001/2.999792458e8;
318//
319 Int_t nt=0;
320 Int_t jev=0;
321 Int_t j, kf;
322 fTrials=0;
2590ccf9 323
8d2cd130 324
325 // Set collision vertex position
2590ccf9 326 if (fVertexSmear == kPerEvent) Vertex();
327
8d2cd130 328// event loop
329 while(1)
330 {
32d6ef7d 331//
5fa4b20b 332// Produce event
32d6ef7d 333//
32d6ef7d 334//
5fa4b20b 335// Switch hadronisation off
336//
337 fPythia->SetMSTJ(1, 0);
32d6ef7d 338//
5fa4b20b 339// Either produce new event or read partons from file
340//
341 if (!fReadFromFile) {
342 fPythia->Pyevnt();
343 fNpartons = fPythia->GetN();
344 } else {
345 printf("Loading Event %d\n",AliRunLoader::GetRunLoader()->GetEventNumber());
346 fRL->GetEvent(AliRunLoader::GetRunLoader()->GetEventNumber());
347 fPythia->SetN(0);
348 LoadEvent(fRL->Stack(), 0 , 1);
349 fPythia->Pyedit(21);
350 }
351
32d6ef7d 352//
353// Run quenching routine
354//
5fa4b20b 355 if (fQuench == 1) {
356 fPythia->Quench();
357 } else if (fQuench == 2){
358 fPythia->Pyquen(208., 0, 0.);
359 }
32d6ef7d 360//
5fa4b20b 361// Switch hadronisation on
32d6ef7d 362//
5fa4b20b 363 fPythia->SetMSTJ(1, 1);
364//
365// .. and perform hadronisation
366// printf("Calling hadronisation %d\n", fPythia->GetN());
367 fPythia->Pyexec();
368
e2bddf81 369 if (gAlice) {
370 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
371 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
372 }
7ea3ea5b 373
8d2cd130 374 fTrials++;
8d2cd130 375 fPythia->ImportParticles(fParticles,"All");
1d568bc2 376 Boost();
8d2cd130 377//
378//
379//
380 Int_t i;
381
5fa4b20b 382
8d2cd130 383 Int_t np = fParticles->GetEntriesFast();
5fa4b20b 384
8d2cd130 385 if (np == 0 ) continue;
8d2cd130 386//
2590ccf9 387
8d2cd130 388//
389 Int_t* pParent = new Int_t[np];
390 Int_t* pSelected = new Int_t[np];
391 Int_t* trackIt = new Int_t[np];
5fa4b20b 392 for (i = 0; i < np; i++) {
8d2cd130 393 pParent[i] = -1;
394 pSelected[i] = 0;
395 trackIt[i] = 0;
396 }
397
398 Int_t nc = 0; // Total n. of selected particles
399 Int_t nParents = 0; // Selected parents
400 Int_t nTkbles = 0; // Trackable particles
401 if (fProcess != kPyMb && fProcess != kPyJets &&
402 fProcess != kPyDirectGamma &&
403 fProcess != kPyMbNonDiffr) {
404
5fa4b20b 405 for (i = 0; i < np; i++) {
2590ccf9 406 TParticle* iparticle = (TParticle *) fParticles->At(i);
8d2cd130 407 Int_t ks = iparticle->GetStatusCode();
408 kf = CheckPDGCode(iparticle->GetPdgCode());
409// No initial state partons
410 if (ks==21) continue;
411//
412// Heavy Flavor Selection
413//
414 // quark ?
415 kf = TMath::Abs(kf);
416 Int_t kfl = kf;
417 // meson ?
418 if (kfl > 10) kfl/=100;
419 // baryon
420 if (kfl > 10) kfl/=10;
421 if (kfl > 10) kfl/=10;
422
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 {
457 continue;
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)
465 && !KinematicSelection(iparticle, 1))
466 {
467 continue;
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;
497 nc++;
498// Decision on tracking
499 trackIt[i] = 0;
500//
501// Track final state particle
502 if (ks == 1) trackIt[i] = 1;
503// Track semi-stable particles
d25cfd65 504 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 505// Track particles selected by process if undecayed.
506 if (fForceDecay == kNoDecay) {
507 if (ParentSelected(kf)) trackIt[i] = 1;
508 } else {
509 if (ParentSelected(kf)) trackIt[i] = 0;
510 }
511 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
512//
513//
514
515 } // particle selection loop
516 if (nc > 0) {
517 for (i = 0; i<np; i++) {
518 if (!pSelected[i]) continue;
519 TParticle * iparticle = (TParticle *) fParticles->At(i);
520 kf = CheckPDGCode(iparticle->GetPdgCode());
521 Int_t ks = iparticle->GetStatusCode();
522 p[0] = iparticle->Px();
523 p[1] = iparticle->Py();
524 p[2] = iparticle->Pz();
a920faf9 525 p[3] = iparticle->Energy();
526
2590ccf9 527 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
528 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
529 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
530
8d2cd130 531 Float_t tof = kconv*iparticle->T();
532 Int_t ipa = iparticle->GetFirstMother()-1;
533 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 534
535 PushTrack(fTrackIt*trackIt[i], iparent, kf,
536 p[0], p[1], p[2], p[3],
537 origin[0], origin[1], origin[2], tof,
538 polar[0], polar[1], polar[2],
539 kPPrimary, nt, 1., ks);
8d2cd130 540 pParent[i] = nt;
541 KeepTrack(nt);
642f15cf 542 } // PushTrack loop
8d2cd130 543 }
544 } else {
545 nc = GenerateMB();
546 } // mb ?
547
548 if (pParent) delete[] pParent;
549 if (pSelected) delete[] pSelected;
550 if (trackIt) delete[] trackIt;
551
552 if (nc > 0) {
553 switch (fCountMode) {
554 case kCountAll:
555 // printf(" Count all \n");
556 jev += nc;
557 break;
558 case kCountParents:
559 // printf(" Count parents \n");
560 jev += nParents;
561 break;
562 case kCountTrackables:
563 // printf(" Count trackable \n");
564 jev += nTkbles;
565 break;
566 }
567 if (jev >= fNpart || fNpart == -1) {
568 fKineBias=Float_t(fNpart)/Float_t(fTrials);
569 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
570
571 fQ += fPythia->GetVINT(51);
572 fX1 += fPythia->GetVINT(41);
573 fX2 += fPythia->GetVINT(42);
574 fTrialsRun += fTrials;
575 fNev++;
576 MakeHeader();
577 break;
578 }
579 }
580 } // event loop
581 SetHighWaterMark(nt);
582// adjust weight due to kinematic selection
b88f5cea 583// AdjustWeights();
8d2cd130 584// get cross-section
585 fXsection=fPythia->GetPARI(1);
586}
587
588Int_t AliGenPythia::GenerateMB()
589{
590//
591// Min Bias selection and other global selections
592//
593 Int_t i, kf, nt, iparent;
594 Int_t nc = 0;
bf950da8 595 Float_t p[4];
8d2cd130 596 Float_t polar[3] = {0,0,0};
597 Float_t origin[3] = {0,0,0};
598// converts from mm/c to s
599 const Float_t kconv=0.001/2.999792458e8;
600
5fa4b20b 601
602
603 Int_t np = (fHadronisation) ? fParticles->GetEntriesFast() : fNpartons;
604
605
8d2cd130 606 Int_t* pParent = new Int_t[np];
607 for (i=0; i< np; i++) pParent[i] = -1;
608 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
609 TParticle* jet1 = (TParticle *) fParticles->At(6);
610 TParticle* jet2 = (TParticle *) fParticles->At(7);
611 if (!CheckTrigger(jet1, jet2)) return 0;
612 }
613
614 for (i = 0; i<np; i++) {
615 Int_t trackIt = 0;
616 TParticle * iparticle = (TParticle *) fParticles->At(i);
617 kf = CheckPDGCode(iparticle->GetPdgCode());
618 Int_t ks = iparticle->GetStatusCode();
619 Int_t km = iparticle->GetFirstMother();
620 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
621 (ks != 1) ||
622 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
623 nc++;
624 if (ks == 1) trackIt = 1;
625 Int_t ipa = iparticle->GetFirstMother()-1;
626
627 iparent = (ipa > -1) ? pParent[ipa] : -1;
628
629//
630// store track information
631 p[0] = iparticle->Px();
632 p[1] = iparticle->Py();
633 p[2] = iparticle->Pz();
a920faf9 634 p[3] = iparticle->Energy();
1406f599 635
a920faf9 636
2590ccf9 637 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
638 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
639 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
640
8d2cd130 641 Float_t tof=kconv*iparticle->T();
a920faf9 642
643 PushTrack(fTrackIt*trackIt, iparent, kf,
644 p[0], p[1], p[2], p[3],
645 origin[0], origin[1], origin[2], tof,
646 polar[0], polar[1], polar[2],
647 kPPrimary, nt, 1., ks);
5fa4b20b 648 //
649 // Special Treatment to store color-flow
650 //
651 if (ks == 3 || ks == 13 || ks == 14) {
652 TParticle* particle = 0;
653 if (fStack) {
654 particle = fStack->Particle(nt);
655 } else {
656 particle = gAlice->Stack()->Particle(nt);
657 }
658 particle->SetFirstDaughter(fPythia->GetK(2, i));
659 particle->SetLastDaughter(fPythia->GetK(3, i));
660 }
661
8d2cd130 662 KeepTrack(nt);
663 pParent[i] = nt;
664 } // select particle
665 } // particle loop
666
667 if (pParent) delete[] pParent;
668
669 printf("\n I've put %i particles on the stack \n",nc);
670 return nc;
671}
672
673
674void AliGenPythia::FinishRun()
675{
676// Print x-section summary
677 fPythia->Pystat(1);
678 fQ /= fNev;
679 fX1 /= fNev;
680 fX2 /= fNev;
681 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
682 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
683
684
685}
686
687void AliGenPythia::AdjustWeights()
688{
689// Adjust the weights after generation of all events
690//
e2bddf81 691 if (gAlice) {
692 TParticle *part;
693 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
694 for (Int_t i=0; i<ntrack; i++) {
695 part= gAlice->GetMCApp()->Particle(i);
696 part->SetWeight(part->GetWeight()*fKineBias);
697 }
8d2cd130 698 }
699}
700
701void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
702{
703// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 704
1a626d4e 705 fAProjectile = a1;
706 fATarget = a2;
1d568bc2 707 fSetNuclei = kTRUE;
8d2cd130 708}
709
710
711void AliGenPythia::MakeHeader()
712{
713// Builds the event header, to be called after each event
e5c87a3d 714 if (fHeader) delete fHeader;
715 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 716//
717// Event type
e5c87a3d 718 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 719//
720// Number of trials
e5c87a3d 721 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 722//
723// Event Vertex
d25cfd65 724 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 725//
726// Jets that have triggered
727 if (fProcess == kPyJets)
728 {
729 Int_t ntrig, njet;
730 Float_t jets[4][10];
731 GetJets(njet, ntrig, jets);
732
733 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 734 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 735 jets[3][i]);
736 }
737 }
5fa4b20b 738//
739// Copy relevant information from external header, if present.
740//
741 Float_t uqJet[4];
742
743 if (fRL) {
744 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
745 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
746 {
747 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
748
749
750 exHeader->TriggerJet(i, uqJet);
751 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
752 }
753 }
754//
755// Store quenching parameters
756//
757 if (fQuench){
758 Double_t z[4];
759 Double_t xp, yp;
760
761 fPythia->GetQuenchingParameters(xp, yp, z);
762
763 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
764 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
765 }
766
767//
768// Pass header to RunLoader
769//
770 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(fHeader);
8d2cd130 771}
772
773
774Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
775{
776// Check the kinematic trigger condition
777//
778 Double_t eta[2];
779 eta[0] = jet1->Eta();
780 eta[1] = jet2->Eta();
781 Double_t phi[2];
782 phi[0] = jet1->Phi();
783 phi[1] = jet2->Phi();
784 Int_t pdg[2];
785 pdg[0] = jet1->GetPdgCode();
786 pdg[1] = jet2->GetPdgCode();
787 Bool_t triggered = kFALSE;
788
789 if (fProcess == kPyJets) {
790 Int_t njets = 0;
791 Int_t ntrig = 0;
792 Float_t jets[4][10];
793//
794// Use Pythia clustering on parton level to determine jet axis
795//
796 GetJets(njets, ntrig, jets);
797
798 if (ntrig) triggered = kTRUE;
799//
800 } else {
801 Int_t ij = 0;
802 Int_t ig = 1;
803 if (pdg[0] == kGamma) {
804 ij = 1;
805 ig = 0;
806 }
807 //Check eta range first...
808 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
809 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
810 {
811 //Eta is okay, now check phi range
812 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
813 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
814 {
815 triggered = kTRUE;
816 }
817 }
818 }
819 return triggered;
820}
821
822AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
823{
824// Assignment operator
014a9521 825 rhs.Copy(*this);
8d2cd130 826 return *this;
827}
828
5fa4b20b 829void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
8d2cd130 830{
831//
832// Load event into Pythia Common Block
833//
5fa4b20b 834
32d6ef7d 835 Int_t npart = stack -> GetNprimary();
836 Int_t n0 = 0;
837
838 if (!flag) {
839 (fPythia->GetPyjets())->N = npart;
840 } else {
841 n0 = (fPythia->GetPyjets())->N;
842 (fPythia->GetPyjets())->N = n0 + npart;
843 }
844
845
8d2cd130 846 for (Int_t part = 0; part < npart; part++) {
32d6ef7d 847 TParticle *MPart = stack->Particle(part);
848
5fa4b20b 849 Int_t kf = MPart->GetPdgCode();
850 Int_t ks = MPart->GetStatusCode();
851 Int_t idf = MPart->GetFirstDaughter();
852 Int_t idl = MPart->GetLastDaughter();
853
854 if (reHadr) {
855 if (ks == 11 || ks == 12) {
856 ks -= 10;
857 idf = -1;
858 idl = -1;
859 }
860 }
32d6ef7d 861
8d2cd130 862 Float_t px = MPart->Px();
863 Float_t py = MPart->Py();
864 Float_t pz = MPart->Pz();
865 Float_t e = MPart->Energy();
a920faf9 866 Float_t m = MPart->GetCalcMass();
8d2cd130 867
868
32d6ef7d 869 (fPythia->GetPyjets())->P[0][part+n0] = px;
870 (fPythia->GetPyjets())->P[1][part+n0] = py;
871 (fPythia->GetPyjets())->P[2][part+n0] = pz;
872 (fPythia->GetPyjets())->P[3][part+n0] = e;
873 (fPythia->GetPyjets())->P[4][part+n0] = m;
8d2cd130 874
32d6ef7d 875 (fPythia->GetPyjets())->K[1][part+n0] = kf;
876 (fPythia->GetPyjets())->K[0][part+n0] = ks;
5fa4b20b 877 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
878 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
879 (fPythia->GetPyjets())->K[2][part+n0] = MPart->GetFirstMother() + 1;
8d2cd130 880 }
881}
882
5fa4b20b 883
014a9521 884void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 885{
886//
887// Calls the Pythia jet finding algorithm to find jets in the current event
888//
889//
8d2cd130 890//
891// Save jets
892 Int_t n = fPythia->GetN();
893
894//
895// Run Jet Finder
896 fPythia->Pycell(njets);
897 Int_t i;
898 for (i = 0; i < njets; i++) {
899 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
900 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
901 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
902 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
903
904 jets[0][i] = px;
905 jets[1][i] = py;
906 jets[2][i] = pz;
907 jets[3][i] = e;
908 }
909}
910
911
912
913void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
914{
915//
916// Calls the Pythia clustering algorithm to find jets in the current event
917//
918 Int_t n = fPythia->GetN();
919 nJets = 0;
920 nJetsTrig = 0;
921 if (fJetReconstruction == kCluster) {
922//
923// Configure cluster algorithm
924//
925 fPythia->SetPARU(43, 2.);
926 fPythia->SetMSTU(41, 1);
927//
928// Call cluster algorithm
929//
930 fPythia->Pyclus(nJets);
931//
932// Loading jets from common block
933//
934 } else {
592f8307 935
8d2cd130 936//
937// Run Jet Finder
938 fPythia->Pycell(nJets);
939 }
940
941 Int_t i;
942 for (i = 0; i < nJets; i++) {
943 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
944 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
945 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
946 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
947 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 948 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 949 Float_t theta = TMath::ATan2(pt,pz);
950 Float_t et = e * TMath::Sin(theta);
951 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
952
953 if (
954 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 955 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 956 et > fEtMinJet && et < fEtMaxJet
957 )
958 {
959 jets[0][nJetsTrig] = px;
960 jets[1][nJetsTrig] = py;
961 jets[2][nJetsTrig] = pz;
962 jets[3][nJetsTrig] = e;
963 nJetsTrig++;
5fa4b20b 964// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
8d2cd130 965 } else {
966// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
967 }
968 }
969}
970
971
972#ifdef never
973void AliGenPythia::Streamer(TBuffer &R__b)
974{
975 // Stream an object of class AliGenPythia.
976
977 if (R__b.IsReading()) {
978 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
979 AliGenerator::Streamer(R__b);
980 R__b >> (Int_t&)fProcess;
981 R__b >> (Int_t&)fStrucFunc;
982 R__b >> (Int_t&)fForceDecay;
983 R__b >> fEnergyCMS;
984 R__b >> fKineBias;
985 R__b >> fTrials;
986 fParentSelect.Streamer(R__b);
987 fChildSelect.Streamer(R__b);
988 R__b >> fXsection;
989// (AliPythia::Instance())->Streamer(R__b);
990 R__b >> fPtHardMin;
991 R__b >> fPtHardMax;
992// if (fDecayer) fDecayer->Streamer(R__b);
993 } else {
994 R__b.WriteVersion(AliGenPythia::IsA());
995 AliGenerator::Streamer(R__b);
996 R__b << (Int_t)fProcess;
997 R__b << (Int_t)fStrucFunc;
998 R__b << (Int_t)fForceDecay;
999 R__b << fEnergyCMS;
1000 R__b << fKineBias;
1001 R__b << fTrials;
1002 fParentSelect.Streamer(R__b);
1003 fChildSelect.Streamer(R__b);
1004 R__b << fXsection;
1005// R__b << fPythia;
1006 R__b << fPtHardMin;
1007 R__b << fPtHardMax;
1008 // fDecayer->Streamer(R__b);
1009 }
1010}
1011#endif
1012
90d7b703 1013