1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 ////////////////////////////////////////////////////////////////////////////////
18 // This class works as generic interface to an event.
19 // Its main purpose is to provide a unique reference which includes all the
20 // facilities available in the AliVEvent generic base class, plus all info
21 // which could be needed during analysis, which are not in AliVEvent but
22 // need to be accessed from ESD or AOD objects, usually in different ways.
23 // When MC is available, it is properly taken into account.
25 // authors: A. Pulvirenti (alberto.pulvirenti@ct.infn.it)
26 // M. Vala (martin.vala@cern.ch)
28 ////////////////////////////////////////////////////////////////////////////////
30 #include <Riostream.h>
33 #include "AliGenEventHeader.h"
35 #include "AliRsnCutSet.h"
36 #include "AliRsnEvent.h"
40 //_____________________________________________________________________________
41 AliRsnEvent::AliRsnEvent(AliVEvent *ref, AliVEvent *refMC) :
49 // Default constructor.
53 //_____________________________________________________________________________
54 AliRsnEvent::AliRsnEvent(const AliRsnEvent &event) :
58 fLeading(event.fLeading),
60 fAODList(event.fAODList)
67 //_____________________________________________________________________________
68 AliRsnEvent &AliRsnEvent::operator= (const AliRsnEvent &event)
71 // Works in the same way as the copy constructor.
74 TObject::operator=(event);
78 fRefMC = event.fRefMC;
79 fLeading = event.fLeading;
81 fAODList = event.fAODList;
86 //_____________________________________________________________________________
87 AliRsnEvent::~AliRsnEvent()
90 // Destructor (does nothing since there are not owned pointers)
94 //_____________________________________________________________________________
95 void AliRsnEvent::SetDaughter(AliRsnDaughter &out, Int_t index, Bool_t fromMC)
98 // Assigns to the first argument the reference to the i-th track in the ref event.
99 // What assignment method to be used will depend on the index and on the type of input.
100 // If the last argument is kTRUE and an MC is referenced, then both fRef and fRefMC will
101 // point to the MC particle (pure MC analysis)
104 // by default the daughter is reset
105 // and assigned the used index
108 out.SetOwnerEvent(this);
111 if (!InputOK()) return;
112 Bool_t inputESD = IsESD();
114 // if it is pure MC, the index tells what particle
115 // to be read in the stack of MC particles, otherwise
116 // it is converted into a real collection index
119 Bool_t ok = (inputESD ? SetMCInfoESD(out) : SetMCInfoAOD(out));
122 out.SetRef(out.GetRefMC());
126 AliRsnDaughter::ERefType type;
127 if (!ConvertAbsoluteIndex(index, trueIndex, type)) {
128 AliError(Form("Failed to convert absolute index %d", index));
132 case AliRsnDaughter::kTrack:
133 if (inputESD) SetDaughterESDtrack(out, trueIndex); else SetDaughterAODtrack(out, trueIndex);
135 case AliRsnDaughter::kV0:
136 if (inputESD) SetDaughterESDv0(out, trueIndex); else SetDaughterAODv0(out, trueIndex);
138 case AliRsnDaughter::kCascade:
139 if (inputESD) SetDaughterESDcascade(out, trueIndex); else SetDaughterAODcascade(out, trueIndex);
142 AliError("Unrecognized daughter type");
148 //_____________________________________________________________________________
149 AliRsnDaughter AliRsnEvent::GetDaughter(Int_t i, Bool_t fromMC)
152 // Returns a daughter set using same criteria as SetDaughter
156 SetDaughter(d, i, fromMC);
160 //_____________________________________________________________________________
161 void AliRsnEvent::SetDaughterESDtrack(AliRsnDaughter &out, Int_t i)
164 // Setup the first argument to the track identified by the index.
165 // When available, adds the MC information and references.
167 // Version #1: ESD tracks
170 AliESDEvent *esd = (AliESDEvent *)fRef;
172 if (i >= 0 && i < esd->GetNumberOfTracks()) {
173 AliESDtrack *track = esd->GetTrack(i);
177 // if MC is present, assign label and retrieve corresponding particle
179 out.SetLabel(TMath::Abs(track->GetLabel()));
180 if (!SetMCInfoESD(out)) {
181 AliWarning("Failed assignment of MC info");
185 AliWarning("Null track");
188 AliWarning(Form("Overflow: required index = %d, max = %d", i, esd->GetNumberOfTracks()));
192 //_____________________________________________________________________________
193 void AliRsnEvent::SetDaughterAODtrack(AliRsnDaughter &out, Int_t i)
196 // Setup the first argument to the track identified by the index.
197 // When available, adds the MC information and references.
199 // Version #2: AOD tracks
202 AliAODEvent *aod = (AliAODEvent *)fRef;
204 if (i >= 0 && i < aod->GetNumberOfTracks()) {
205 AliAODTrack *track = aod->GetTrack(i);
209 // if MC is present, assign label and retrieve corresponding particle
211 out.SetLabel(TMath::Abs(track->GetLabel()));
212 if (!SetMCInfoAOD(out)) {
213 AliWarning("Failed assignment of MC info");
217 AliWarning("Null track");
220 AliWarning(Form("Overflow: required index = %d, max = %d", i, aod->GetNumberOfTracks()));
224 //_____________________________________________________________________________
225 void AliRsnEvent::SetDaughterESDv0(AliRsnDaughter &out, Int_t i)
228 // Setup the first argument to the track identified by the index.
229 // When available, adds the MC information and references.
231 // Version #3: ESD v0
234 if (i >= 0 && i < fRef->GetNumberOfV0s()) {
235 AliESDEvent *ev = GetRefESD();
236 AliESDv0 *v0 = ev->GetV0(i);
240 // if MC is present, retrieve the label of V0 from those of daughters
242 AliMCEvent *mc = (AliMCEvent *)fRefMC;
243 AliESDtrack *tp = ev->GetTrack(v0->GetPindex());
244 AliESDtrack *tn = ev->GetTrack(v0->GetNindex());
245 if (mc && tp && tn) {
246 Int_t lp = TMath::Abs(tp->GetLabel());
247 Int_t ln = TMath::Abs(tn->GetLabel());
248 TParticle *pp = mc->Stack()->Particle(lp);
249 TParticle *pn = mc->Stack()->Particle(ln);
251 // if their first mothers are the same, the V0 is true
252 // otherwise label remains '-1' --> fake V0
253 if (pp->GetFirstMother() == pn->GetFirstMother() && pp->GetFirstMother() >= 0) {
254 out.SetLabel(pp->GetFirstMother());
264 //_____________________________________________________________________________
265 void AliRsnEvent::SetDaughterAODv0(AliRsnDaughter &out, Int_t i)
268 // Setup the first argument to the track identified by the index.
269 // When available, adds the MC information and references.
271 // Version #4: AOD v0
274 if (i >= 0 && i < fRef->GetNumberOfV0s()) {
275 AliAODEvent *ev = (AliAODEvent *)fRef;
276 AliAODv0 *v0 = ev->GetV0(i);
281 AliAODEvent *mc = (AliAODEvent *)fRefMC;
282 TClonesArray *mcArray = (TClonesArray *)mc->GetList()->FindObject(AliAODMCParticle::StdBranchName());
283 AliAODTrack *tp = (AliAODTrack *)v0->GetDaughter(0);
284 AliAODTrack *tn = (AliAODTrack *)v0->GetDaughter(1);
285 if (mcArray && tp && tn) {
286 Int_t lp = TMath::Abs(tp->GetLabel());
287 Int_t ln = TMath::Abs(tn->GetLabel());
288 AliAODMCParticle *pp = (AliAODMCParticle *)mcArray->At(lp);
289 AliAODMCParticle *pn = (AliAODMCParticle *)mcArray->At(ln);
291 // if their first mothers are the same, the V0 is true
292 // otherwise label remains '-1' --> fake V0
293 if (pp->GetMother() == pn->GetMother() && pp->GetMother() >= 0) {
294 out.SetLabel(pp->GetMother());
304 //_____________________________________________________________________________
305 void AliRsnEvent::SetDaughterESDcascade(AliRsnDaughter &out, Int_t i)
308 // Setup the first argument to the track identified by the index.
309 // When available, adds the MC information and references.
311 // Version #3: ESD cascade
314 if (i >= 0 && i < fRef->GetNumberOfCascades()) {
315 AliESDEvent *ev = GetRefESD();
316 AliESDcascade *casc = ev->GetCascade(i);
327 //_____________________________________________________________________________
328 void AliRsnEvent::SetDaughterAODcascade(AliRsnDaughter &out, Int_t i)
331 // Setup the first argument to the track identified by the index.
332 // When available, adds the MC information and references.
334 // Version #4: AOD cascade
337 if (i >= 0 && i < fRef->GetNumberOfCascades()) {
338 AliAODEvent *ev = GetRefAOD();
339 AliAODv0 *casc = ev->GetCascade(i);
350 //_____________________________________________________________________________
351 Bool_t AliRsnEvent::SetMCInfoESD(AliRsnDaughter &out)
354 // Using the label assigned to the daughter, searches for the MC informations:
359 // if label makes no sense --> failed
360 Int_t label = out.GetLabel();
361 if (label < 0 || !fRefMC) return kFALSE;
363 // get number of particles
364 Int_t nMC = fRefMC->GetNumberOfTracks();
366 // if label too large --> failed
368 AliWarning(Form("Stack overflow: track label = %d -- stack maximum = %d", label, nMC));
373 AliMCEvent *mc = (AliMCEvent *)fRefMC;
374 AliMCParticle *mcPart = (AliMCParticle *)mc->GetTrack(label);
376 // if particle = NULL --> failed
378 AliWarning(Form("Stack discontinuity: label %d refers to a NULL object", label));
381 // otherwise --> success
382 out.SetRefMC(mcPart);
384 // if the particle is not primary, find the mother and get its PDG
385 Int_t imum = mcPart->Particle()->GetFirstMother();
386 if (imum >= 0 && imum < nMC) {
387 AliMCParticle *mcMother = (AliMCParticle *)mc->GetTrack(imum);
389 out.SetMotherPDG(mcMother->Particle()->GetPdgCode());
391 AliWarning(Form("Stack discontinuity: label mother %d refers to a NULL object", imum));
394 AliWarning(Form("Stack overflow: mother label = %d -- stack maximum = %d", imum, nMC));
400 //_____________________________________________________________________________
401 Bool_t AliRsnEvent::SetMCInfoAOD(AliRsnDaughter &out)
404 // Using the label assigned to the daughter, searches for the MC informations:
409 // if label makes no sense --> failed
410 Int_t label = out.GetLabel();
411 if (label < 0 || !fRefMC) return kFALSE;
414 AliAODEvent *mc = (AliAODEvent *)fRefMC;
415 TClonesArray *mcArray = (TClonesArray *)mc->GetList()->FindObject(AliAODMCParticle::StdBranchName());
417 // get number of particles
418 Int_t nMC = mcArray->GetEntriesFast();
420 // if label too large --> failed
422 AliWarning(Form("Stack overflow: track label = %d -- stack maximum = %d", label, nMC));
426 // if particle = NULL --> failed
427 AliAODMCParticle *mcPart = (AliAODMCParticle *)mcArray->At(label);
429 AliWarning(Form("Stack discontinuity: label %d refers to a NULL object", label));
432 // otherwise --> success
433 out.SetRefMC(mcPart);
435 // if the particle is not primary, find the mother and get its PDG
436 Int_t imum = mcPart->GetMother();
437 if (imum >= 0 && imum < nMC) {
438 AliAODMCParticle *mcMother = (AliAODMCParticle *)mcArray->At(imum);
440 out.SetMotherPDG(mcMother->GetPdgCode());
442 AliWarning(Form("Stack discontinuity: label mother %d refers to a NULL object", imum));
444 } else if (imum >= nMC) {
445 AliWarning(Form("Stack overflow: mother label = %d -- stack maximum = %d", imum, nMC));
451 //_____________________________________________________________________________
452 Bool_t AliRsnEvent::ConvertAbsoluteIndex(Int_t index, Int_t &realIndex, AliRsnDaughter::ERefType &type)
455 // Using the phylosophy of the absolute index, which loops over
456 // all tracks, V0s and cascades, returns the result of a check
457 // on it (first argument) based on this criterion:
458 // 1) if the absolute ID is smaller than number of tracks,
459 // return itself and the type 'track'
460 // 2) if the absolute ID is larger than number of tracks, subtract it
461 // and if the result is smaller than number of V0s,
462 // return the corresponding V0 index and type
463 // 3) if the absolute ID is larger than number of tracks + V0s, subtract them
464 // and if the result is smaller than number of cascades,
465 // return the corresponding cascade index and type
466 // The results of this check are stored in the reference arguments, while the outcome of
467 // the function is kTRUE if one of these checks was successful, otherwise it is kFALSE,
468 // meaning that the absolute index reached the end.
471 Int_t nTracks = fRef->GetNumberOfTracks();
472 Int_t nV0s = fRef->GetNumberOfV0s();
473 Int_t nCascades = fRef->GetNumberOfCascades();
475 if (index < nTracks) {
477 type = AliRsnDaughter::kTrack;
479 } else if (index >= nTracks && index < nTracks + nV0s) {
480 realIndex = index - nTracks;
481 type = AliRsnDaughter::kV0;
483 } else if (index >= nTracks + nV0s && index < nTracks + nV0s + nCascades) {
484 realIndex = index - nTracks - nV0s;
485 type = AliRsnDaughter::kCascade;
490 type = AliRsnDaughter::kNoType;
494 //_____________________________________________________________________________
495 Int_t AliRsnEvent::ConvertRealIndex(Int_t index, AliRsnDaughter::ERefType type)
498 // Translates a pair made by index + object type into the corresponding
499 // absolute index, which is set to -1 in case the real index overflows.
502 Int_t nTracks = fRef->GetNumberOfTracks();
503 Int_t nV0s = fRef->GetNumberOfV0s();
504 Int_t nCascades = fRef->GetNumberOfCascades();
507 case AliRsnDaughter::kTrack:
508 if (index >= 0 && index < nTracks)
512 case AliRsnDaughter::kV0:
513 if (index >= 0 && index < nV0s)
514 return nTracks + index;
517 case AliRsnDaughter::kCascade:
518 if (index >= 0 && index < nCascades)
519 return nTracks + nV0s + index;
527 //_____________________________________________________________________________
528 Int_t AliRsnEvent::SelectLeadingParticle(AliRsnCutSet *cuts)
531 // Searches the collection of all particles with given PID type and charge,
532 // and returns the one with largest momentum, provided that it is greater than 1st argument.
533 // If one specifies AliRsnPID::kUnknown as type or AliRsnDaughter::kNoPID as method,
534 // the check is done over all particles irrespectively of their PID.
535 // If the sign argument is '+' or '-', the check is done over the particles of that charge,
536 // otherwise it is done irrespectively of the charge.
540 Bool_t inputESD = IsESD();
541 if (!inputESD && !IsAOD()) {
542 AliError("Need to process ESD or AOD input");
546 Double_t ptMax = 0.0;
547 Int_t i, nTracks = fRef->GetNumberOfTracks();
550 AliRsnDaughter leading;
552 for (i = 0; i < nTracks; i++) {
554 SetDaughterESDtrack(leading, i);
556 SetDaughterAODtrack(leading, i);
557 if (!leading.IsOK()) {
558 AliDebugClass(1, Form("Failed assignment of track %d", i));
561 if (cuts && !cuts->IsSelected(&leading)) {
562 AliDebugClass(1, Form("Track %d didn't pass cuts", i));
565 // check if it has largest momentum
566 if (leading.GetRef()->Pt() > ptMax) {
567 ptMax = leading.GetRef()->Pt();