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[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
16/*
17$Log$
aabc7187 18Revision 1.2 2003/03/27 09:28:38 morsch
19Charm production process configuration for pPb and pp added
20(A. Dainese, N. Carrer)
21
adf4d898 22Revision 1.1 2003/03/15 15:00:48 morsch
23Classed imported from EVGEN.
24
8d2cd130 25Revision 1.69 2003/01/14 10:50:19 alibrary
26Cleanup of STEER coding conventions
27
28Revision 1.68 2002/12/11 09:16:16 morsch
29Use GetJets to fill header.
30
31Revision 1.67 2002/12/09 15:24:09 morsch
32Same trigger routine can use Pycell or Pyclus.
33
34Revision 1.66 2002/12/09 08:22:56 morsch
35UA1 jet finder (Pycell) for software triggering added.
36
37Revision 1.65 2002/11/19 08:57:10 morsch
38Configuration of pt-kick added.
39
40Revision 1.64 2002/11/15 00:43:06 morsch
41Changes for kPyJets
42- initial and final state g-radiation + pt-kick default
43- trigger based on parton clusters (using pyclus)
44- trigger jets are stored in header.
45
46Revision 1.63 2002/10/14 14:55:35 hristov
47Merging the VirtualMC branch to the main development branch (HEAD)
48
49Revision 1.52.4.4 2002/10/10 16:40:08 hristov
50Updating VirtualMC to v3-09-02
51
52Revision 1.62 2002/09/24 10:00:01 morsch
53CheckTrigger() corrected.
54
55Revision 1.61 2002/07/30 09:52:38 morsch
56Call SetGammaPhiRange() and SetGammaEtaRange() in the constructor.
57
58Revision 1.60 2002/07/19 14:49:03 morsch
59Typo corrected.
60
61Revision 1.59 2002/07/19 14:35:36 morsch
62Count total number of trials. Print mean Q, x1, x2.
63
64Revision 1.58 2002/07/17 10:04:09 morsch
65SetYHard method added.
66
67Revision 1.57 2002/05/22 13:22:53 morsch
68Process kPyMbNonDiffr added.
69
70Revision 1.56 2002/04/26 10:30:01 morsch
71Option kPyBeautyPbMNR added. (N. Carrer).
72
73Revision 1.55 2002/04/17 10:23:56 morsch
74Coding Rule violations corrected.
75
76Revision 1.54 2002/03/28 11:49:10 morsch
77Pass status code in SetTrack.
78
79Revision 1.53 2002/03/25 14:51:13 morsch
80New stack-fill and count options introduced (N. Carrer).
81
82Revision 1.51 2002/03/06 08:46:57 morsch
83- Loop until np-1
84- delete dyn. alloc. arrays (N. Carrer)
85
86Revision 1.50 2002/03/03 13:48:50 morsch
87Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR
88NLO calculations (Nicola Carrer).
89
90Revision 1.49 2002/02/08 16:50:50 morsch
91Add name and title in constructor.
92
93Revision 1.48 2001/12/20 11:44:28 morsch
94Add kinematic bias for direct gamma production.
95
96Revision 1.47 2001/12/19 14:45:00 morsch
97Store number of trials in header.
98
99Revision 1.46 2001/12/19 10:36:19 morsch
100Add possibility if jet kinematic biasing.
101
102Revision 1.45 2001/11/28 08:06:52 morsch
103Use fMaxLifeTime parameter.
104
105Revision 1.44 2001/11/27 13:13:07 morsch
106Maximum lifetime for long-lived particles to be put on the stack is parameter.
107It can be set via SetMaximumLifetime(..).
108
109Revision 1.43 2001/10/21 18:35:56 hristov
110Several pointers were set to zero in the default constructors to avoid memory management problems
111
112Revision 1.42 2001/10/15 08:21:55 morsch
113Vertex truncation settings moved to AliGenMC.
114
115Revision 1.41 2001/10/08 08:45:42 morsch
116Possibility of vertex cut added.
117
118Revision 1.40 2001/09/25 11:30:23 morsch
119Pass event vertex to header.
120
121Revision 1.39 2001/07/27 17:09:36 morsch
122Use local SetTrack, KeepTrack and SetHighWaterMark methods
123to delegate either to local stack or to stack owned by AliRun.
124(Piotr Skowronski, A.M.)
125
126Revision 1.38 2001/07/13 10:58:54 morsch
127- Some coded moved to AliGenMC
128- Improved handling of secondary vertices.
129
130Revision 1.37 2001/06/28 11:17:28 morsch
131SetEventListRange setter added. Events in specified range are listed for
132debugging. (Yuri Kharlov)
133
134Revision 1.36 2001/03/30 07:05:49 morsch
135Final print-out in finish run.
136Write parton system for jet-production (preliminary solution).
137
138Revision 1.35 2001/03/09 13:03:40 morsch
139Process_t and Struc_Func_t moved to AliPythia.h
140
141Revision 1.34 2001/02/14 15:50:40 hristov
142The last particle in event marked using SetHighWaterMark
143
144Revision 1.33 2001/01/30 09:23:12 hristov
145Streamers removed (R.Brun)
146
147Revision 1.32 2001/01/26 19:55:51 hristov
148Major upgrade of AliRoot code
149
150Revision 1.31 2001/01/17 10:54:31 hristov
151Better protection against FPE
152
153Revision 1.30 2000/12/18 08:55:35 morsch
154Make AliPythia dependent generartors work with new scheme of random number generation
155
156Revision 1.29 2000/12/04 11:22:03 morsch
157Init of sRandom as in 1.15
158
159Revision 1.28 2000/12/02 11:41:39 morsch
160Use SetRandom() to initialize random number generator in constructor.
161
162Revision 1.27 2000/11/30 20:29:02 morsch
163Initialise static variable sRandom in constructor: sRandom = fRandom;
164
165Revision 1.26 2000/11/30 07:12:50 alibrary
166Introducing new Rndm and QA classes
167
168Revision 1.25 2000/10/18 19:11:27 hristov
169Division by zero fixed
170
171Revision 1.24 2000/09/18 10:41:35 morsch
172Add possibility to use nuclear structure functions from PDF library V8.
173
174Revision 1.23 2000/09/14 14:05:40 morsch
175dito
176
177Revision 1.22 2000/09/14 14:02:22 morsch
178- Correct conversion from mm to cm when passing particle vertex to MC.
179- Correct handling of fForceDecay == all.
180
181Revision 1.21 2000/09/12 14:14:55 morsch
182Call fDecayer->ForceDecay() at the beginning of Generate().
183
184Revision 1.20 2000/09/06 14:29:33 morsch
185Use AliPythia for event generation an AliDecayPythia for decays.
186Correct handling of "nodecay" option
187
188Revision 1.19 2000/07/11 18:24:56 fca
189Coding convention corrections + few minor bug fixes
190
191Revision 1.18 2000/06/30 12:40:34 morsch
192Pythia takes care of vertex smearing. Correct conversion from Pythia units (mm) to
193Geant units (cm).
194
195Revision 1.17 2000/06/09 20:34:07 morsch
196All coding rule violations except RS3 corrected
197
198Revision 1.16 2000/05/15 15:04:20 morsch
199The full event is written for fNtrack = -1
200Coding rule violations corrected.
201
202Revision 1.15 2000/04/26 10:14:24 morsch
203Particles array has one entry more than pythia particle list. Upper bound of
204particle loop changed to np-1 (R. Guernane, AM)
205
206Revision 1.14 2000/04/05 08:36:13 morsch
207Check status code of particles in Pythia event
208to avoid double counting as partonic state and final state particle.
209
210Revision 1.13 1999/11/09 07:38:48 fca
211Changes for compatibility with version 2.23 of ROOT
212
213Revision 1.12 1999/11/03 17:43:20 fca
214New version from G.Martinez & A.Morsch
215
216Revision 1.11 1999/09/29 09:24:14 fca
217Introduction of the Copyright and cvs Log
218*/
219
220//
221// Generator using the TPythia interface (via AliPythia)
222// to generate pp collisions.
223// Using SetNuclei() also nuclear modifications to the structure functions
224// can be taken into account. This makes, of course, only sense for the
225// generation of the products of hard processes (heavy flavor, jets ...)
226//
227// andreas.morsch@cern.ch
228//
229
230#include <TDatabasePDG.h>
231#include <TParticle.h>
232#include <TPDGCode.h>
233#include <TSystem.h>
234#include <TTree.h>
235
236#include "AliConst.h"
237#include "AliDecayerPythia.h"
238#include "AliGenPythia.h"
239#include "AliGenPythiaEventHeader.h"
240#include "AliPythia.h"
241#include "AliRun.h"
242
243 ClassImp(AliGenPythia)
244
245AliGenPythia::AliGenPythia()
246 :AliGenMC()
247{
248// Default Constructor
249 fParticles = 0;
250 fPythia = 0;
251 fDecayer = new AliDecayerPythia();
252 SetEventListRange();
253 SetJetPhiRange();
254 SetJetEtaRange();
255 SetJetEtRange();
256 SetGammaPhiRange();
257 SetGammaEtaRange();
258 SetPtKick();
259}
260
261AliGenPythia::AliGenPythia(Int_t npart)
262 :AliGenMC(npart)
263{
264// default charm production at 5. 5 TeV
265// semimuonic decay
266// structure function GRVHO
267//
268 fName = "Pythia";
269 fTitle= "Particle Generator using PYTHIA";
270 fXsection = 0.;
271 fNucA1=0;
272 fNucA2=0;
273 SetProcess();
274 SetStrucFunc();
275 SetForceDecay();
276 SetPtHard();
277 SetYHard();
278 SetEnergyCMS();
279 fDecayer = new AliDecayerPythia();
280 // Set random number generator
281 sRandom=fRandom;
282 fFlavorSelect = 0;
283 // Produced particles
284 fParticles = new TClonesArray("TParticle",1000);
285 fEventVertex.Set(3);
286 SetEventListRange();
287 SetJetPhiRange();
288 SetJetEtaRange();
289 SetJetEtRange();
290 SetGammaPhiRange();
291 SetGammaEtaRange();
292 SetJetReconstructionMode();
293 SetPtKick();
294 // Options determining what to keep in the stack (Heavy flavour generation)
295 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
296 fFeedDownOpt = kTRUE; // allow feed down from higher family
297 // Fragmentation on/off
298 fFragmentation = kTRUE;
299 // Default counting mode
300 fCountMode = kCountAll;
301}
302
303AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
304{
305// copy constructor
306 Pythia.Copy(*this);
307}
308
309AliGenPythia::~AliGenPythia()
310{
311// Destructor
312}
313
314void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
315{
316 // Set a range of event numbers, for which a table
317 // of generated particle will be printed
318 fDebugEventFirst = eventFirst;
319 fDebugEventLast = eventLast;
320 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
321}
322
323void AliGenPythia::Init()
324{
325// Initialisation
326
327 SetMC(AliPythia::Instance());
328 fPythia=(AliPythia*) fgMCEvGen;
329//
330 fParentWeight=1./Float_t(fNpart);
331//
332// Forward Paramters to the AliPythia object
333 fDecayer->SetForceDecay(fForceDecay);
334 fDecayer->Init();
335
336
337 fPythia->SetCKIN(3,fPtHardMin);
338 fPythia->SetCKIN(4,fPtHardMax);
339 fPythia->SetCKIN(7,fYHardMin);
340 fPythia->SetCKIN(8,fYHardMax);
341
342 if (fNucA1 > 0 && fNucA2 > 0) fPythia->SetNuclei(fNucA1, fNucA2);
343 // Fragmentation?
344 if (fFragmentation) {
345 fPythia->SetMSTP(111,1);
346 } else {
347 fPythia->SetMSTP(111,0);
348 }
349
350
351// initial state radiation
352 fPythia->SetMSTP(61,fGinit);
353// final state radiation
354 fPythia->SetMSTP(71,fGfinal);
355// pt - kick
356 if (fPtKick > 0.) {
357 fPythia->SetMSTP(91,1);
358 fPythia->SetPARP(91,fPtKick);
359 } else {
360 fPythia->SetMSTP(91,0);
361 }
362
363 // fPythia->SetMSTJ(1,2);
364 //
365 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
366
367// Parent and Children Selection
368 switch (fProcess)
369 {
370 case kPyCharm:
371 case kPyCharmUnforced:
adf4d898 372 case kPyCharmPbPbMNR:
aabc7187 373 case kPyCharmppMNR:
374 case kPyCharmpPbMNR:
8d2cd130 375 fParentSelect[0] = 411;
376 fParentSelect[1] = 421;
377 fParentSelect[2] = 431;
378 fParentSelect[3] = 4122;
379 fFlavorSelect = 4;
380 break;
adf4d898 381 case kPyD0PbPbMNR:
382 case kPyD0pPbMNR:
383 case kPyD0ppMNR:
8d2cd130 384 fParentSelect[0] = 421;
385 fFlavorSelect = 4;
386 break;
387 case kPyBeauty:
adf4d898 388 case kPyBeautyPbPbMNR:
389 case kPyBeautypPbMNR:
390 case kPyBeautyppMNR:
8d2cd130 391 fParentSelect[0]= 511;
392 fParentSelect[1]= 521;
393 fParentSelect[2]= 531;
394 fParentSelect[3]= 5122;
395 fParentSelect[4]= 5132;
396 fParentSelect[5]= 5232;
397 fParentSelect[6]= 5332;
398 fFlavorSelect = 5;
399 break;
400 case kPyBeautyUnforced:
401 fParentSelect[0] = 511;
402 fParentSelect[1] = 521;
403 fParentSelect[2] = 531;
404 fParentSelect[3] = 5122;
405 fParentSelect[4] = 5132;
406 fParentSelect[5] = 5232;
407 fParentSelect[6] = 5332;
408 fFlavorSelect = 5;
409 break;
410 case kPyJpsiChi:
411 case kPyJpsi:
412 fParentSelect[0] = 443;
413 break;
414 case kPyMb:
415 case kPyMbNonDiffr:
416 case kPyJets:
417 case kPyDirectGamma:
418 break;
419 }
420//
421// This counts the total number of calls to Pyevnt() per run.
422 fTrialsRun = 0;
423 fQ = 0.;
424 fX1 = 0.;
425 fX2 = 0.;
426 fNev = 0 ;
427//
428 AliGenMC::Init();
429}
430
431void AliGenPythia::Generate()
432{
433// Generate one event
434 fDecayer->ForceDecay();
435
436 Float_t polar[3] = {0,0,0};
437 Float_t origin[3] = {0,0,0};
438 Float_t p[3];
439// converts from mm/c to s
440 const Float_t kconv=0.001/2.999792458e8;
441//
442 Int_t nt=0;
443 Int_t jev=0;
444 Int_t j, kf;
445 fTrials=0;
446
447 // Set collision vertex position
448 if(fVertexSmear==kPerEvent) {
449 fPythia->SetMSTP(151,1);
450 for (j=0;j<3;j++) {
451 fPythia->SetPARP(151+j, fOsigma[j]*10.);
452 }
453 } else if (fVertexSmear==kPerTrack) {
454 fPythia->SetMSTP(151,0);
455 }
456// event loop
457 while(1)
458 {
459 fPythia->Pyevnt();
460 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
461 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
462 fTrials++;
463
464 fPythia->ImportParticles(fParticles,"All");
465
466//
467//
468//
469 Int_t i;
470
471 Int_t np = fParticles->GetEntriesFast();
472 if (np == 0 ) continue;
473// Get event vertex and discard the event if the Z coord. is too big
474 TParticle *iparticle = (TParticle *) fParticles->At(0);
475 Float_t distz = iparticle->Vz()/10.;
476 if(TMath::Abs(distz)>fCutVertexZ*fOsigma[2]) continue;
477//
478 fEventVertex[0] = iparticle->Vx()/10.+fOrigin.At(0);
479 fEventVertex[1] = iparticle->Vy()/10.+fOrigin.At(1);
480 fEventVertex[2] = iparticle->Vz()/10.+fOrigin.At(2);
481//
482 Int_t* pParent = new Int_t[np];
483 Int_t* pSelected = new Int_t[np];
484 Int_t* trackIt = new Int_t[np];
485 for (i=0; i< np; i++) {
486 pParent[i] = -1;
487 pSelected[i] = 0;
488 trackIt[i] = 0;
489 }
490
491 Int_t nc = 0; // Total n. of selected particles
492 Int_t nParents = 0; // Selected parents
493 Int_t nTkbles = 0; // Trackable particles
494 if (fProcess != kPyMb && fProcess != kPyJets &&
495 fProcess != kPyDirectGamma &&
496 fProcess != kPyMbNonDiffr) {
497
498 for (i = 0; i<np; i++) {
499 iparticle = (TParticle *) fParticles->At(i);
500 Int_t ks = iparticle->GetStatusCode();
501 kf = CheckPDGCode(iparticle->GetPdgCode());
502// No initial state partons
503 if (ks==21) continue;
504//
505// Heavy Flavor Selection
506//
507 // quark ?
508 kf = TMath::Abs(kf);
509 Int_t kfl = kf;
510 // meson ?
511 if (kfl > 10) kfl/=100;
512 // baryon
513 if (kfl > 10) kfl/=10;
514 if (kfl > 10) kfl/=10;
515
516 Int_t ipa = iparticle->GetFirstMother()-1;
517 Int_t kfMo = 0;
518
519 if (ipa > -1) {
520 TParticle * mother = (TParticle *) fParticles->At(ipa);
521 kfMo = TMath::Abs(mother->GetPdgCode());
522 }
523 // What to keep in Stack?
524 Bool_t flavorOK = kFALSE;
525 Bool_t selectOK = kFALSE;
526 if (fFeedDownOpt) {
527 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
528 } else {
529 if (kfl > fFlavorSelect) {
530 nc = -1;
531 break;
532 }
533 if (kfl == fFlavorSelect) flavorOK = kTRUE;
534 }
535 switch (fStackFillOpt) {
536 case kFlavorSelection:
537 selectOK = kTRUE;
538 break;
539 case kParentSelection:
540 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
541 break;
542 }
543 if (flavorOK && selectOK) {
544//
545// Heavy flavor hadron or quark
546//
547// Kinematic seletion on final state heavy flavor mesons
548 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
549 {
550 continue;
551 }
552 pSelected[i] = 1;
553 if (ParentSelected(kf)) ++nParents; // Update parent count
554// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
555 } else {
556// Kinematic seletion on decay products
557 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
558 && !KinematicSelection(iparticle, 1))
559 {
560 continue;
561 }
562//
563// Decay products
564// Select if mother was selected and is not tracked
565
566 if (pSelected[ipa] &&
567 !trackIt[ipa] && // mother will be tracked ?
568 kfMo != 5 && // mother is b-quark, don't store fragments
569 kfMo != 4 && // mother is c-quark, don't store fragments
570 kf != 92) // don't store string
571 {
572//
573// Semi-stable or de-selected: diselect decay products:
574//
575//
576 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
577 {
578 Int_t ipF = iparticle->GetFirstDaughter();
579 Int_t ipL = iparticle->GetLastDaughter();
580 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
581 }
582// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
583 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
584 }
585 }
586 if (pSelected[i] == -1) pSelected[i] = 0;
587 if (!pSelected[i]) continue;
588 // Count quarks only if you did not include fragmentation
589 if (fFragmentation && kf <= 10) continue;
590 nc++;
591// Decision on tracking
592 trackIt[i] = 0;
593//
594// Track final state particle
595 if (ks == 1) trackIt[i] = 1;
596// Track semi-stable particles
597 if ((ks ==1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
598// Track particles selected by process if undecayed.
599 if (fForceDecay == kNoDecay) {
600 if (ParentSelected(kf)) trackIt[i] = 1;
601 } else {
602 if (ParentSelected(kf)) trackIt[i] = 0;
603 }
604 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
605//
606//
607
608 } // particle selection loop
609 if (nc > 0) {
610 for (i = 0; i<np; i++) {
611 if (!pSelected[i]) continue;
612 TParticle * iparticle = (TParticle *) fParticles->At(i);
613 kf = CheckPDGCode(iparticle->GetPdgCode());
614 Int_t ks = iparticle->GetStatusCode();
615 p[0] = iparticle->Px();
616 p[1] = iparticle->Py();
617 p[2] = iparticle->Pz();
618 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
619 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
620 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
621 Float_t tof = kconv*iparticle->T();
622 Int_t ipa = iparticle->GetFirstMother()-1;
623 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
624 SetTrack(fTrackIt*trackIt[i] ,
625 iparent, kf, p, origin, polar, tof, kPPrimary, nt, 1., ks);
626 pParent[i] = nt;
627 KeepTrack(nt);
628 } // SetTrack loop
629 }
630 } else {
631 nc = GenerateMB();
632 } // mb ?
633
634 if (pParent) delete[] pParent;
635 if (pSelected) delete[] pSelected;
636 if (trackIt) delete[] trackIt;
637
638 if (nc > 0) {
639 switch (fCountMode) {
640 case kCountAll:
641 // printf(" Count all \n");
642 jev += nc;
643 break;
644 case kCountParents:
645 // printf(" Count parents \n");
646 jev += nParents;
647 break;
648 case kCountTrackables:
649 // printf(" Count trackable \n");
650 jev += nTkbles;
651 break;
652 }
653 if (jev >= fNpart || fNpart == -1) {
654 fKineBias=Float_t(fNpart)/Float_t(fTrials);
655 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
656
657 fQ += fPythia->GetVINT(51);
658 fX1 += fPythia->GetVINT(41);
659 fX2 += fPythia->GetVINT(42);
660 fTrialsRun += fTrials;
661 fNev++;
662 MakeHeader();
663 break;
664 }
665 }
666 } // event loop
667 SetHighWaterMark(nt);
668// adjust weight due to kinematic selection
669 AdjustWeights();
670// get cross-section
671 fXsection=fPythia->GetPARI(1);
672}
673
674Int_t AliGenPythia::GenerateMB()
675{
676//
677// Min Bias selection and other global selections
678//
679 Int_t i, kf, nt, iparent;
680 Int_t nc = 0;
681 Float_t p[3];
682 Float_t polar[3] = {0,0,0};
683 Float_t origin[3] = {0,0,0};
684// converts from mm/c to s
685 const Float_t kconv=0.001/2.999792458e8;
686
687 Int_t np = fParticles->GetEntriesFast();
688 Int_t* pParent = new Int_t[np];
689 for (i=0; i< np; i++) pParent[i] = -1;
690 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
691 TParticle* jet1 = (TParticle *) fParticles->At(6);
692 TParticle* jet2 = (TParticle *) fParticles->At(7);
693 if (!CheckTrigger(jet1, jet2)) return 0;
694 }
695
696 for (i = 0; i<np; i++) {
697 Int_t trackIt = 0;
698 TParticle * iparticle = (TParticle *) fParticles->At(i);
699 kf = CheckPDGCode(iparticle->GetPdgCode());
700 Int_t ks = iparticle->GetStatusCode();
701 Int_t km = iparticle->GetFirstMother();
702 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
703 (ks != 1) ||
704 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
705 nc++;
706 if (ks == 1) trackIt = 1;
707 Int_t ipa = iparticle->GetFirstMother()-1;
708
709 iparent = (ipa > -1) ? pParent[ipa] : -1;
710
711//
712// store track information
713 p[0] = iparticle->Px();
714 p[1] = iparticle->Py();
715 p[2] = iparticle->Pz();
716 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
717 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
718 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
719 Float_t tof=kconv*iparticle->T();
720 SetTrack(fTrackIt*trackIt, iparent, kf, p, origin, polar,
721 tof, kPPrimary, nt, 1., ks);
722 KeepTrack(nt);
723 pParent[i] = nt;
724 } // select particle
725 } // particle loop
726
727 if (pParent) delete[] pParent;
728
729 printf("\n I've put %i particles on the stack \n",nc);
730 return nc;
731}
732
733
734void AliGenPythia::FinishRun()
735{
736// Print x-section summary
737 fPythia->Pystat(1);
738 fQ /= fNev;
739 fX1 /= fNev;
740 fX2 /= fNev;
741 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
742 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
743
744
745}
746
747void AliGenPythia::AdjustWeights()
748{
749// Adjust the weights after generation of all events
750//
751 TParticle *part;
752 Int_t ntrack=gAlice->GetNtrack();
753 for (Int_t i=0; i<ntrack; i++) {
754 part= gAlice->Particle(i);
755 part->SetWeight(part->GetWeight()*fKineBias);
756 }
757}
758
759void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
760{
761// Treat protons as inside nuclei with mass numbers a1 and a2
762 fNucA1 = a1;
763 fNucA2 = a2;
764}
765
766
767void AliGenPythia::MakeHeader()
768{
769// Builds the event header, to be called after each event
770 AliGenEventHeader* header = new AliGenPythiaEventHeader("Pythia");
771//
772// Event type
773 ((AliGenPythiaEventHeader*) header)->SetProcessType(fPythia->GetMSTI(1));
774//
775// Number of trials
776 ((AliGenPythiaEventHeader*) header)->SetTrials(fTrials);
777//
778// Event Vertex
779 header->SetPrimaryVertex(fEventVertex);
780//
781// Jets that have triggered
782 if (fProcess == kPyJets)
783 {
784 Int_t ntrig, njet;
785 Float_t jets[4][10];
786 GetJets(njet, ntrig, jets);
787
788 for (Int_t i = 0; i < ntrig; i++) {
789 ((AliGenPythiaEventHeader*) header)->AddJet(jets[0][i], jets[1][i], jets[2][i],
790 jets[3][i]);
791 }
792 }
793 gAlice->SetGenEventHeader(header);
794}
795
796
797Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
798{
799// Check the kinematic trigger condition
800//
801 Double_t eta[2];
802 eta[0] = jet1->Eta();
803 eta[1] = jet2->Eta();
804 Double_t phi[2];
805 phi[0] = jet1->Phi();
806 phi[1] = jet2->Phi();
807 Int_t pdg[2];
808 pdg[0] = jet1->GetPdgCode();
809 pdg[1] = jet2->GetPdgCode();
810 Bool_t triggered = kFALSE;
811
812 if (fProcess == kPyJets) {
813 Int_t njets = 0;
814 Int_t ntrig = 0;
815 Float_t jets[4][10];
816//
817// Use Pythia clustering on parton level to determine jet axis
818//
819 GetJets(njets, ntrig, jets);
820
821 if (ntrig) triggered = kTRUE;
822//
823 } else {
824 Int_t ij = 0;
825 Int_t ig = 1;
826 if (pdg[0] == kGamma) {
827 ij = 1;
828 ig = 0;
829 }
830 //Check eta range first...
831 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
832 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
833 {
834 //Eta is okay, now check phi range
835 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
836 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
837 {
838 triggered = kTRUE;
839 }
840 }
841 }
842 return triggered;
843}
844
845AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
846{
847// Assignment operator
848 return *this;
849}
850
851void AliGenPythia::LoadEvent()
852{
853//
854// Load event into Pythia Common Block
855//
856
857
858 Int_t npart = (Int_t) (gAlice->TreeK())->GetEntries();
859 (fPythia->GetPyjets())->N = npart;
860
861 for (Int_t part = 0; part < npart; part++) {
862 TParticle *MPart = gAlice->Particle(part);
863 Int_t kf = MPart->GetPdgCode();
864 Int_t ks = MPart->GetStatusCode();
865 Float_t px = MPart->Px();
866 Float_t py = MPart->Py();
867 Float_t pz = MPart->Pz();
868 Float_t e = MPart->Energy();
869 Float_t p = TMath::Sqrt(px * px + py * py + pz * pz);
870 Float_t m = TMath::Sqrt(e * e - p * p);
871
872
873 (fPythia->GetPyjets())->P[0][part] = px;
874 (fPythia->GetPyjets())->P[1][part] = py;
875 (fPythia->GetPyjets())->P[2][part] = pz;
876 (fPythia->GetPyjets())->P[3][part] = e;
877 (fPythia->GetPyjets())->P[4][part] = m;
878
879 (fPythia->GetPyjets())->K[1][part] = kf;
880 (fPythia->GetPyjets())->K[0][part] = ks;
881 }
882}
883
884void AliGenPythia::RecJetsUA1(Float_t eCellMin, Float_t eCellSeed, Float_t eMin, Float_t rMax,
885 Int_t& njets, Float_t jets [4][50])
886{
887//
888// Calls the Pythia jet finding algorithm to find jets in the current event
889//
890//
891// Configure detector (EMCAL like)
892//
893 fPythia->SetPARU(51,2.);
894 fPythia->SetMSTU(51,Int_t(96 * 2./0.7));
895 fPythia->SetMSTU(52,3 * 144);
896//
897// Configure Jet Finder
898//
899 fPythia->SetPARU(58, eCellMin);
900 fPythia->SetPARU(52, eCellSeed);
901 fPythia->SetPARU(53, eMin);
902 fPythia->SetPARU(54, rMax);
903 fPythia->SetMSTU(54, 2);
904//
905// Save jets
906 Int_t n = fPythia->GetN();
907
908//
909// Run Jet Finder
910 fPythia->Pycell(njets);
911 Int_t i;
912 for (i = 0; i < njets; i++) {
913 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
914 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
915 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
916 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
917
918 jets[0][i] = px;
919 jets[1][i] = py;
920 jets[2][i] = pz;
921 jets[3][i] = e;
922 }
923}
924
925
926
927void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
928{
929//
930// Calls the Pythia clustering algorithm to find jets in the current event
931//
932 Int_t n = fPythia->GetN();
933 nJets = 0;
934 nJetsTrig = 0;
935 if (fJetReconstruction == kCluster) {
936//
937// Configure cluster algorithm
938//
939 fPythia->SetPARU(43, 2.);
940 fPythia->SetMSTU(41, 1);
941//
942// Call cluster algorithm
943//
944 fPythia->Pyclus(nJets);
945//
946// Loading jets from common block
947//
948 } else {
949//
950// Configure detector (EMCAL like)
951//
952 fPythia->SetPARU(51,2.);
953 fPythia->SetMSTU(51,Int_t(96 * 2./0.7));
954 fPythia->SetMSTU(52,3 * 144);
955//
956// Configure Jet Finder
957//
958 fPythia->SetPARU(58, 0.0);
959 fPythia->SetPARU(52, 4.0);
960 fPythia->SetPARU(53, 10.0);
961 fPythia->SetPARU(54, 1.0);
962 fPythia->SetMSTU(54, 2);
963//
964// Run Jet Finder
965 fPythia->Pycell(nJets);
966 }
967
968 Int_t i;
969 for (i = 0; i < nJets; i++) {
970 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
971 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
972 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
973 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
974 Float_t pt = TMath::Sqrt(px * px + py * py);
975 Float_t phi = TMath::ATan2(py,px);
976 Float_t theta = TMath::ATan2(pt,pz);
977 Float_t et = e * TMath::Sin(theta);
978 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
979
980 if (
981 eta > fEtaMinJet && eta < fEtaMaxJet &&
982 phi > fPhiMinJet && eta < fPhiMaxJet &&
983 et > fEtMinJet && et < fEtMaxJet
984 )
985 {
986 jets[0][nJetsTrig] = px;
987 jets[1][nJetsTrig] = py;
988 jets[2][nJetsTrig] = pz;
989 jets[3][nJetsTrig] = e;
990 nJetsTrig++;
991
992 } else {
993// printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
994 }
995 }
996}
997
998
999#ifdef never
1000void AliGenPythia::Streamer(TBuffer &R__b)
1001{
1002 // Stream an object of class AliGenPythia.
1003
1004 if (R__b.IsReading()) {
1005 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
1006 AliGenerator::Streamer(R__b);
1007 R__b >> (Int_t&)fProcess;
1008 R__b >> (Int_t&)fStrucFunc;
1009 R__b >> (Int_t&)fForceDecay;
1010 R__b >> fEnergyCMS;
1011 R__b >> fKineBias;
1012 R__b >> fTrials;
1013 fParentSelect.Streamer(R__b);
1014 fChildSelect.Streamer(R__b);
1015 R__b >> fXsection;
1016// (AliPythia::Instance())->Streamer(R__b);
1017 R__b >> fPtHardMin;
1018 R__b >> fPtHardMax;
1019// if (fDecayer) fDecayer->Streamer(R__b);
1020 } else {
1021 R__b.WriteVersion(AliGenPythia::IsA());
1022 AliGenerator::Streamer(R__b);
1023 R__b << (Int_t)fProcess;
1024 R__b << (Int_t)fStrucFunc;
1025 R__b << (Int_t)fForceDecay;
1026 R__b << fEnergyCMS;
1027 R__b << fKineBias;
1028 R__b << fTrials;
1029 fParentSelect.Streamer(R__b);
1030 fChildSelect.Streamer(R__b);
1031 R__b << fXsection;
1032// R__b << fPythia;
1033 R__b << fPtHardMin;
1034 R__b << fPtHardMax;
1035 // fDecayer->Streamer(R__b);
1036 }
1037}
1038#endif
1039