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8d2cd130 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
7cdba479 16/* $Id$ */
8d2cd130 17
18//
19// Generator using the TPythia interface (via AliPythia)
20// to generate pp collisions.
21// Using SetNuclei() also nuclear modifications to the structure functions
22// can be taken into account. This makes, of course, only sense for the
23// generation of the products of hard processes (heavy flavor, jets ...)
24//
25// andreas.morsch@cern.ch
26//
27
28#include <TDatabasePDG.h>
29#include <TParticle.h>
30#include <TPDGCode.h>
31#include <TSystem.h>
32#include <TTree.h>
33
34#include "AliConst.h"
35#include "AliDecayerPythia.h"
36#include "AliGenPythia.h"
37#include "AliGenPythiaEventHeader.h"
38#include "AliPythia.h"
7cdba479 39#include "AliPythiaRndm.h"
8d2cd130 40#include "AliRun.h"
7ea3ea5b 41#include "AliStack.h"
42#include "AliRunLoader.h"
5d12ce38 43#include "AliMC.h"
8d2cd130 44
014a9521 45ClassImp(AliGenPythia)
8d2cd130 46
47AliGenPythia::AliGenPythia()
48 :AliGenMC()
49{
50// Default Constructor
51 fParticles = 0;
52 fPythia = 0;
e5c87a3d 53 fHeader = 0;
8d2cd130 54 fDecayer = new AliDecayerPythia();
55 SetEventListRange();
56 SetJetPhiRange();
57 SetJetEtaRange();
58 SetJetEtRange();
59 SetGammaPhiRange();
60 SetGammaEtaRange();
61 SetPtKick();
7ea3ea5b 62 SetQuench();
63
1d568bc2 64 fSetNuclei = kFALSE;
7cdba479 65 if (!AliPythiaRndm::GetPythiaRandom())
66 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 67}
68
69AliGenPythia::AliGenPythia(Int_t npart)
70 :AliGenMC(npart)
71{
72// default charm production at 5. 5 TeV
73// semimuonic decay
74// structure function GRVHO
75//
76 fName = "Pythia";
77 fTitle= "Particle Generator using PYTHIA";
78 fXsection = 0.;
8d2cd130 79 SetProcess();
80 SetStrucFunc();
81 SetForceDecay();
82 SetPtHard();
83 SetYHard();
84 SetEnergyCMS();
85 fDecayer = new AliDecayerPythia();
86 // Set random number generator
7cdba479 87 if (!AliPythiaRndm::GetPythiaRandom())
88 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 89 fFlavorSelect = 0;
90 // Produced particles
91 fParticles = new TClonesArray("TParticle",1000);
e5c87a3d 92 fHeader = 0;
8d2cd130 93 SetEventListRange();
94 SetJetPhiRange();
95 SetJetEtaRange();
96 SetJetEtRange();
97 SetGammaPhiRange();
98 SetGammaEtaRange();
99 SetJetReconstructionMode();
7ea3ea5b 100 SetQuench();
8d2cd130 101 SetPtKick();
102 // Options determining what to keep in the stack (Heavy flavour generation)
103 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
104 fFeedDownOpt = kTRUE; // allow feed down from higher family
105 // Fragmentation on/off
106 fFragmentation = kTRUE;
107 // Default counting mode
108 fCountMode = kCountAll;
592f8307 109 // Pycel
110 SetPycellParameters();
1d568bc2 111 fSetNuclei = kFALSE;
8d2cd130 112}
113
114AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
f936b8ea 115 :AliGenMC(Pythia)
8d2cd130 116{
117// copy constructor
118 Pythia.Copy(*this);
119}
120
121AliGenPythia::~AliGenPythia()
122{
123// Destructor
124}
125
592f8307 126void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
127 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
128{
129// Set pycell parameters
130 fPycellEtaMax = etamax;
131 fPycellNEta = neta;
132 fPycellNPhi = nphi;
133 fPycellThreshold = thresh;
134 fPycellEtSeed = etseed;
135 fPycellMinEtJet = minet;
136 fPycellMaxRadius = r;
137}
138
139
140
8d2cd130 141void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
142{
143 // Set a range of event numbers, for which a table
144 // of generated particle will be printed
145 fDebugEventFirst = eventFirst;
146 fDebugEventLast = eventLast;
147 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
148}
149
150void AliGenPythia::Init()
151{
152// Initialisation
153
154 SetMC(AliPythia::Instance());
b88f5cea 155 fPythia=(AliPythia*) fMCEvGen;
8d2cd130 156//
157 fParentWeight=1./Float_t(fNpart);
158//
159// Forward Paramters to the AliPythia object
160 fDecayer->SetForceDecay(fForceDecay);
161 fDecayer->Init();
162
163
164 fPythia->SetCKIN(3,fPtHardMin);
165 fPythia->SetCKIN(4,fPtHardMax);
166 fPythia->SetCKIN(7,fYHardMin);
167 fPythia->SetCKIN(8,fYHardMax);
168
1a626d4e 169 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
8d2cd130 170 // Fragmentation?
171 if (fFragmentation) {
172 fPythia->SetMSTP(111,1);
173 } else {
174 fPythia->SetMSTP(111,0);
175 }
176
177
178// initial state radiation
179 fPythia->SetMSTP(61,fGinit);
180// final state radiation
181 fPythia->SetMSTP(71,fGfinal);
182// pt - kick
183 if (fPtKick > 0.) {
184 fPythia->SetMSTP(91,1);
185 fPythia->SetPARP(91,fPtKick);
186 } else {
187 fPythia->SetMSTP(91,0);
188 }
189
190 // fPythia->SetMSTJ(1,2);
191 //
192 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
193
194// Parent and Children Selection
195 switch (fProcess)
196 {
197 case kPyCharm:
198 case kPyCharmUnforced:
adf4d898 199 case kPyCharmPbPbMNR:
aabc7187 200 case kPyCharmppMNR:
201 case kPyCharmpPbMNR:
8d2cd130 202 fParentSelect[0] = 411;
203 fParentSelect[1] = 421;
204 fParentSelect[2] = 431;
205 fParentSelect[3] = 4122;
206 fFlavorSelect = 4;
207 break;
adf4d898 208 case kPyD0PbPbMNR:
209 case kPyD0pPbMNR:
210 case kPyD0ppMNR:
8d2cd130 211 fParentSelect[0] = 421;
212 fFlavorSelect = 4;
213 break;
214 case kPyBeauty:
adf4d898 215 case kPyBeautyPbPbMNR:
216 case kPyBeautypPbMNR:
217 case kPyBeautyppMNR:
8d2cd130 218 fParentSelect[0]= 511;
219 fParentSelect[1]= 521;
220 fParentSelect[2]= 531;
221 fParentSelect[3]= 5122;
222 fParentSelect[4]= 5132;
223 fParentSelect[5]= 5232;
224 fParentSelect[6]= 5332;
225 fFlavorSelect = 5;
226 break;
227 case kPyBeautyUnforced:
228 fParentSelect[0] = 511;
229 fParentSelect[1] = 521;
230 fParentSelect[2] = 531;
231 fParentSelect[3] = 5122;
232 fParentSelect[4] = 5132;
233 fParentSelect[5] = 5232;
234 fParentSelect[6] = 5332;
235 fFlavorSelect = 5;
236 break;
237 case kPyJpsiChi:
238 case kPyJpsi:
239 fParentSelect[0] = 443;
240 break;
241 case kPyMb:
242 case kPyMbNonDiffr:
243 case kPyJets:
244 case kPyDirectGamma:
245 break;
246 }
247//
592f8307 248//
249// JetFinder for Trigger
250//
251// Configure detector (EMCAL like)
252//
253 fPythia->SetPARU(51, fPycellEtaMax);
254 fPythia->SetMSTU(51, fPycellNEta);
255 fPythia->SetMSTU(52, fPycellNPhi);
256//
257// Configure Jet Finder
258//
259 fPythia->SetPARU(58, fPycellThreshold);
260 fPythia->SetPARU(52, fPycellEtSeed);
261 fPythia->SetPARU(53, fPycellMinEtJet);
262 fPythia->SetPARU(54, fPycellMaxRadius);
263 fPythia->SetMSTU(54, 2);
264//
8d2cd130 265// This counts the total number of calls to Pyevnt() per run.
266 fTrialsRun = 0;
267 fQ = 0.;
268 fX1 = 0.;
269 fX2 = 0.;
270 fNev = 0 ;
271//
1d568bc2 272//
273//
8d2cd130 274 AliGenMC::Init();
1d568bc2 275//
276//
277//
278 if (fSetNuclei) {
279 fDyBoost = 0;
280 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
281 }
8d2cd130 282}
283
284void AliGenPythia::Generate()
285{
286// Generate one event
e5c87a3d 287
8d2cd130 288 fDecayer->ForceDecay();
289
290 Float_t polar[3] = {0,0,0};
291 Float_t origin[3] = {0,0,0};
a920faf9 292 Float_t p[4];
8d2cd130 293// converts from mm/c to s
294 const Float_t kconv=0.001/2.999792458e8;
295//
296 Int_t nt=0;
297 Int_t jev=0;
298 Int_t j, kf;
299 fTrials=0;
300
301 // Set collision vertex position
302 if(fVertexSmear==kPerEvent) {
303 fPythia->SetMSTP(151,1);
304 for (j=0;j<3;j++) {
305 fPythia->SetPARP(151+j, fOsigma[j]*10.);
306 }
307 } else if (fVertexSmear==kPerTrack) {
308 fPythia->SetMSTP(151,0);
309 }
310// event loop
311 while(1)
312 {
7ea3ea5b 313 if (fQuench) {
314 fPythia->SetMSTJ(1, 0);
315 }
316
8d2cd130 317 fPythia->Pyevnt();
7ea3ea5b 318
319 if (fQuench) {
320 fPythia->Quench();
321 fPythia->SetMSTJ(1, 1);
322 fPythia->Pyexec();
323 }
324
325
8d2cd130 326 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
327 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
328 fTrials++;
329
330 fPythia->ImportParticles(fParticles,"All");
331
1d568bc2 332 Boost();
8d2cd130 333//
334//
335//
336 Int_t i;
337
338 Int_t np = fParticles->GetEntriesFast();
339 if (np == 0 ) continue;
340// Get event vertex and discard the event if the Z coord. is too big
341 TParticle *iparticle = (TParticle *) fParticles->At(0);
342 Float_t distz = iparticle->Vz()/10.;
343 if(TMath::Abs(distz)>fCutVertexZ*fOsigma[2]) continue;
344//
d25cfd65 345 fVertex[0] = iparticle->Vx()/10.+fOrigin.At(0);
346 fVertex[1] = iparticle->Vy()/10.+fOrigin.At(1);
347 fVertex[2] = iparticle->Vz()/10.+fOrigin.At(2);
8d2cd130 348//
349 Int_t* pParent = new Int_t[np];
350 Int_t* pSelected = new Int_t[np];
351 Int_t* trackIt = new Int_t[np];
352 for (i=0; i< np; i++) {
353 pParent[i] = -1;
354 pSelected[i] = 0;
355 trackIt[i] = 0;
356 }
357
358 Int_t nc = 0; // Total n. of selected particles
359 Int_t nParents = 0; // Selected parents
360 Int_t nTkbles = 0; // Trackable particles
361 if (fProcess != kPyMb && fProcess != kPyJets &&
362 fProcess != kPyDirectGamma &&
363 fProcess != kPyMbNonDiffr) {
364
365 for (i = 0; i<np; i++) {
366 iparticle = (TParticle *) fParticles->At(i);
367 Int_t ks = iparticle->GetStatusCode();
368 kf = CheckPDGCode(iparticle->GetPdgCode());
369// No initial state partons
370 if (ks==21) continue;
371//
372// Heavy Flavor Selection
373//
374 // quark ?
375 kf = TMath::Abs(kf);
376 Int_t kfl = kf;
377 // meson ?
378 if (kfl > 10) kfl/=100;
379 // baryon
380 if (kfl > 10) kfl/=10;
381 if (kfl > 10) kfl/=10;
382
383 Int_t ipa = iparticle->GetFirstMother()-1;
384 Int_t kfMo = 0;
385
386 if (ipa > -1) {
387 TParticle * mother = (TParticle *) fParticles->At(ipa);
388 kfMo = TMath::Abs(mother->GetPdgCode());
389 }
390 // What to keep in Stack?
391 Bool_t flavorOK = kFALSE;
392 Bool_t selectOK = kFALSE;
393 if (fFeedDownOpt) {
394 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
395 } else {
396 if (kfl > fFlavorSelect) {
397 nc = -1;
398 break;
399 }
400 if (kfl == fFlavorSelect) flavorOK = kTRUE;
401 }
402 switch (fStackFillOpt) {
403 case kFlavorSelection:
404 selectOK = kTRUE;
405 break;
406 case kParentSelection:
407 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
408 break;
409 }
410 if (flavorOK && selectOK) {
411//
412// Heavy flavor hadron or quark
413//
414// Kinematic seletion on final state heavy flavor mesons
415 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
416 {
417 continue;
418 }
419 pSelected[i] = 1;
420 if (ParentSelected(kf)) ++nParents; // Update parent count
421// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
422 } else {
423// Kinematic seletion on decay products
424 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
425 && !KinematicSelection(iparticle, 1))
426 {
427 continue;
428 }
429//
430// Decay products
431// Select if mother was selected and is not tracked
432
433 if (pSelected[ipa] &&
434 !trackIt[ipa] && // mother will be tracked ?
435 kfMo != 5 && // mother is b-quark, don't store fragments
436 kfMo != 4 && // mother is c-quark, don't store fragments
437 kf != 92) // don't store string
438 {
439//
440// Semi-stable or de-selected: diselect decay products:
441//
442//
443 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
444 {
445 Int_t ipF = iparticle->GetFirstDaughter();
446 Int_t ipL = iparticle->GetLastDaughter();
447 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
448 }
449// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
450 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
451 }
452 }
453 if (pSelected[i] == -1) pSelected[i] = 0;
454 if (!pSelected[i]) continue;
455 // Count quarks only if you did not include fragmentation
456 if (fFragmentation && kf <= 10) continue;
457 nc++;
458// Decision on tracking
459 trackIt[i] = 0;
460//
461// Track final state particle
462 if (ks == 1) trackIt[i] = 1;
463// Track semi-stable particles
d25cfd65 464 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
8d2cd130 465// Track particles selected by process if undecayed.
466 if (fForceDecay == kNoDecay) {
467 if (ParentSelected(kf)) trackIt[i] = 1;
468 } else {
469 if (ParentSelected(kf)) trackIt[i] = 0;
470 }
471 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
472//
473//
474
475 } // particle selection loop
476 if (nc > 0) {
477 for (i = 0; i<np; i++) {
478 if (!pSelected[i]) continue;
479 TParticle * iparticle = (TParticle *) fParticles->At(i);
480 kf = CheckPDGCode(iparticle->GetPdgCode());
481 Int_t ks = iparticle->GetStatusCode();
482 p[0] = iparticle->Px();
483 p[1] = iparticle->Py();
484 p[2] = iparticle->Pz();
a920faf9 485 p[3] = iparticle->Energy();
486
8d2cd130 487 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
488 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
489 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
490 Float_t tof = kconv*iparticle->T();
491 Int_t ipa = iparticle->GetFirstMother()-1;
492 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a920faf9 493
494 PushTrack(fTrackIt*trackIt[i], iparent, kf,
495 p[0], p[1], p[2], p[3],
496 origin[0], origin[1], origin[2], tof,
497 polar[0], polar[1], polar[2],
498 kPPrimary, nt, 1., ks);
8d2cd130 499 pParent[i] = nt;
500 KeepTrack(nt);
642f15cf 501 } // PushTrack loop
8d2cd130 502 }
503 } else {
504 nc = GenerateMB();
505 } // mb ?
506
507 if (pParent) delete[] pParent;
508 if (pSelected) delete[] pSelected;
509 if (trackIt) delete[] trackIt;
510
511 if (nc > 0) {
512 switch (fCountMode) {
513 case kCountAll:
514 // printf(" Count all \n");
515 jev += nc;
516 break;
517 case kCountParents:
518 // printf(" Count parents \n");
519 jev += nParents;
520 break;
521 case kCountTrackables:
522 // printf(" Count trackable \n");
523 jev += nTkbles;
524 break;
525 }
526 if (jev >= fNpart || fNpart == -1) {
527 fKineBias=Float_t(fNpart)/Float_t(fTrials);
528 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
529
530 fQ += fPythia->GetVINT(51);
531 fX1 += fPythia->GetVINT(41);
532 fX2 += fPythia->GetVINT(42);
533 fTrialsRun += fTrials;
534 fNev++;
535 MakeHeader();
536 break;
537 }
538 }
539 } // event loop
540 SetHighWaterMark(nt);
541// adjust weight due to kinematic selection
b88f5cea 542// AdjustWeights();
8d2cd130 543// get cross-section
544 fXsection=fPythia->GetPARI(1);
545}
546
547Int_t AliGenPythia::GenerateMB()
548{
549//
550// Min Bias selection and other global selections
551//
552 Int_t i, kf, nt, iparent;
553 Int_t nc = 0;
554 Float_t p[3];
555 Float_t polar[3] = {0,0,0};
556 Float_t origin[3] = {0,0,0};
557// converts from mm/c to s
558 const Float_t kconv=0.001/2.999792458e8;
559
560 Int_t np = fParticles->GetEntriesFast();
561 Int_t* pParent = new Int_t[np];
562 for (i=0; i< np; i++) pParent[i] = -1;
563 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
564 TParticle* jet1 = (TParticle *) fParticles->At(6);
565 TParticle* jet2 = (TParticle *) fParticles->At(7);
566 if (!CheckTrigger(jet1, jet2)) return 0;
567 }
568
569 for (i = 0; i<np; i++) {
570 Int_t trackIt = 0;
571 TParticle * iparticle = (TParticle *) fParticles->At(i);
572 kf = CheckPDGCode(iparticle->GetPdgCode());
573 Int_t ks = iparticle->GetStatusCode();
574 Int_t km = iparticle->GetFirstMother();
575 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
576 (ks != 1) ||
577 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
578 nc++;
579 if (ks == 1) trackIt = 1;
580 Int_t ipa = iparticle->GetFirstMother()-1;
581
582 iparent = (ipa > -1) ? pParent[ipa] : -1;
583
584//
585// store track information
586 p[0] = iparticle->Px();
587 p[1] = iparticle->Py();
588 p[2] = iparticle->Pz();
a920faf9 589 p[3] = iparticle->Energy();
590
8d2cd130 591 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
592 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
593 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
594 Float_t tof=kconv*iparticle->T();
a920faf9 595
596 PushTrack(fTrackIt*trackIt, iparent, kf,
597 p[0], p[1], p[2], p[3],
598 origin[0], origin[1], origin[2], tof,
599 polar[0], polar[1], polar[2],
600 kPPrimary, nt, 1., ks);
8d2cd130 601 KeepTrack(nt);
602 pParent[i] = nt;
603 } // select particle
604 } // particle loop
605
606 if (pParent) delete[] pParent;
607
608 printf("\n I've put %i particles on the stack \n",nc);
609 return nc;
610}
611
612
613void AliGenPythia::FinishRun()
614{
615// Print x-section summary
616 fPythia->Pystat(1);
617 fQ /= fNev;
618 fX1 /= fNev;
619 fX2 /= fNev;
620 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
621 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
622
623
624}
625
626void AliGenPythia::AdjustWeights()
627{
628// Adjust the weights after generation of all events
629//
630 TParticle *part;
5d12ce38 631 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
8d2cd130 632 for (Int_t i=0; i<ntrack; i++) {
5d12ce38 633 part= gAlice->GetMCApp()->Particle(i);
8d2cd130 634 part->SetWeight(part->GetWeight()*fKineBias);
635 }
636}
637
638void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
639{
640// Treat protons as inside nuclei with mass numbers a1 and a2
1d568bc2 641
1a626d4e 642 fAProjectile = a1;
643 fATarget = a2;
1d568bc2 644 fSetNuclei = kTRUE;
8d2cd130 645}
646
647
648void AliGenPythia::MakeHeader()
649{
650// Builds the event header, to be called after each event
e5c87a3d 651 if (fHeader) delete fHeader;
652 fHeader = new AliGenPythiaEventHeader("Pythia");
8d2cd130 653//
654// Event type
e5c87a3d 655 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
8d2cd130 656//
657// Number of trials
e5c87a3d 658 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
8d2cd130 659//
660// Event Vertex
d25cfd65 661 fHeader->SetPrimaryVertex(fVertex);
8d2cd130 662//
663// Jets that have triggered
664 if (fProcess == kPyJets)
665 {
666 Int_t ntrig, njet;
667 Float_t jets[4][10];
668 GetJets(njet, ntrig, jets);
669
670 for (Int_t i = 0; i < ntrig; i++) {
e5c87a3d 671 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
8d2cd130 672 jets[3][i]);
673 }
674 }
e5c87a3d 675 gAlice->SetGenEventHeader(fHeader);
8d2cd130 676}
677
678
679Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
680{
681// Check the kinematic trigger condition
682//
683 Double_t eta[2];
684 eta[0] = jet1->Eta();
685 eta[1] = jet2->Eta();
686 Double_t phi[2];
687 phi[0] = jet1->Phi();
688 phi[1] = jet2->Phi();
689 Int_t pdg[2];
690 pdg[0] = jet1->GetPdgCode();
691 pdg[1] = jet2->GetPdgCode();
692 Bool_t triggered = kFALSE;
693
694 if (fProcess == kPyJets) {
695 Int_t njets = 0;
696 Int_t ntrig = 0;
697 Float_t jets[4][10];
698//
699// Use Pythia clustering on parton level to determine jet axis
700//
701 GetJets(njets, ntrig, jets);
702
703 if (ntrig) triggered = kTRUE;
704//
705 } else {
706 Int_t ij = 0;
707 Int_t ig = 1;
708 if (pdg[0] == kGamma) {
709 ij = 1;
710 ig = 0;
711 }
712 //Check eta range first...
713 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
714 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
715 {
716 //Eta is okay, now check phi range
717 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
718 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
719 {
720 triggered = kTRUE;
721 }
722 }
723 }
724 return triggered;
725}
726
727AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
728{
729// Assignment operator
014a9521 730 rhs.Copy(*this);
8d2cd130 731 return *this;
732}
733
734void AliGenPythia::LoadEvent()
735{
736//
737// Load event into Pythia Common Block
738//
739
7ea3ea5b 740 AliRunLoader* rl = AliRunLoader::GetRunLoader();
741 Int_t npart = (rl->Stack())-> GetNprimary();
8d2cd130 742 (fPythia->GetPyjets())->N = npart;
743
744 for (Int_t part = 0; part < npart; part++) {
7ea3ea5b 745 TParticle *MPart = (rl->Stack())->Particle(part);
8d2cd130 746 Int_t kf = MPart->GetPdgCode();
747 Int_t ks = MPart->GetStatusCode();
748 Float_t px = MPart->Px();
749 Float_t py = MPart->Py();
750 Float_t pz = MPart->Pz();
751 Float_t e = MPart->Energy();
a920faf9 752 Float_t m = MPart->GetCalcMass();
8d2cd130 753
754
755 (fPythia->GetPyjets())->P[0][part] = px;
756 (fPythia->GetPyjets())->P[1][part] = py;
757 (fPythia->GetPyjets())->P[2][part] = pz;
758 (fPythia->GetPyjets())->P[3][part] = e;
759 (fPythia->GetPyjets())->P[4][part] = m;
760
761 (fPythia->GetPyjets())->K[1][part] = kf;
762 (fPythia->GetPyjets())->K[0][part] = ks;
763 }
764}
765
014a9521 766void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
8d2cd130 767{
768//
769// Calls the Pythia jet finding algorithm to find jets in the current event
770//
771//
8d2cd130 772//
773// Save jets
774 Int_t n = fPythia->GetN();
775
776//
777// Run Jet Finder
778 fPythia->Pycell(njets);
779 Int_t i;
780 for (i = 0; i < njets; i++) {
781 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
782 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
783 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
784 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
785
786 jets[0][i] = px;
787 jets[1][i] = py;
788 jets[2][i] = pz;
789 jets[3][i] = e;
790 }
791}
792
793
794
795void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
796{
797//
798// Calls the Pythia clustering algorithm to find jets in the current event
799//
800 Int_t n = fPythia->GetN();
801 nJets = 0;
802 nJetsTrig = 0;
803 if (fJetReconstruction == kCluster) {
804//
805// Configure cluster algorithm
806//
807 fPythia->SetPARU(43, 2.);
808 fPythia->SetMSTU(41, 1);
809//
810// Call cluster algorithm
811//
812 fPythia->Pyclus(nJets);
813//
814// Loading jets from common block
815//
816 } else {
592f8307 817
8d2cd130 818//
819// Run Jet Finder
820 fPythia->Pycell(nJets);
821 }
822
823 Int_t i;
824 for (i = 0; i < nJets; i++) {
825 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
826 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
827 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
828 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
829 Float_t pt = TMath::Sqrt(px * px + py * py);
a920faf9 830 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
8d2cd130 831 Float_t theta = TMath::ATan2(pt,pz);
832 Float_t et = e * TMath::Sin(theta);
833 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
834
835 if (
836 eta > fEtaMinJet && eta < fEtaMaxJet &&
675eb105 837 phi > fPhiMinJet && phi < fPhiMaxJet &&
8d2cd130 838 et > fEtMinJet && et < fEtMaxJet
839 )
840 {
841 jets[0][nJetsTrig] = px;
842 jets[1][nJetsTrig] = py;
843 jets[2][nJetsTrig] = pz;
844 jets[3][nJetsTrig] = e;
845 nJetsTrig++;
846
847 } else {
848// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
849 }
850 }
851}
852
853
854#ifdef never
855void AliGenPythia::Streamer(TBuffer &R__b)
856{
857 // Stream an object of class AliGenPythia.
858
859 if (R__b.IsReading()) {
860 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
861 AliGenerator::Streamer(R__b);
862 R__b >> (Int_t&)fProcess;
863 R__b >> (Int_t&)fStrucFunc;
864 R__b >> (Int_t&)fForceDecay;
865 R__b >> fEnergyCMS;
866 R__b >> fKineBias;
867 R__b >> fTrials;
868 fParentSelect.Streamer(R__b);
869 fChildSelect.Streamer(R__b);
870 R__b >> fXsection;
871// (AliPythia::Instance())->Streamer(R__b);
872 R__b >> fPtHardMin;
873 R__b >> fPtHardMax;
874// if (fDecayer) fDecayer->Streamer(R__b);
875 } else {
876 R__b.WriteVersion(AliGenPythia::IsA());
877 AliGenerator::Streamer(R__b);
878 R__b << (Int_t)fProcess;
879 R__b << (Int_t)fStrucFunc;
880 R__b << (Int_t)fForceDecay;
881 R__b << fEnergyCMS;
882 R__b << fKineBias;
883 R__b << fTrials;
884 fParentSelect.Streamer(R__b);
885 fChildSelect.Streamer(R__b);
886 R__b << fXsection;
887// R__b << fPythia;
888 R__b << fPtHardMin;
889 R__b << fPtHardMax;
890 // fDecayer->Streamer(R__b);
891 }
892}
893#endif
894