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7356f978 | 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 | // | |
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. | |
24 | // | |
25 | // authors: A. Pulvirenti (alberto.pulvirenti@ct.infn.it) | |
26 | // M. Vala (martin.vala@cern.ch) | |
27 | // | |
28 | //////////////////////////////////////////////////////////////////////////////// | |
29 | ||
30 | #include <Riostream.h> | |
4fbb2459 | 31 | #include <TArrayF.h> |
0dffcc8a | 32 | |
4fbb2459 | 33 | #include "AliGenEventHeader.h" |
f34f960b | 34 | |
35 | #include "AliRsnCutSet.h" | |
0dffcc8a | 36 | #include "AliRsnEvent.h" |
37 | ||
aec0ec32 | 38 | ClassImp(AliRsnEvent) |
0dffcc8a | 39 | |
7c2974c8 | 40 | //_____________________________________________________________________________ |
a378358c | 41 | AliRsnEvent::AliRsnEvent(AliVEvent *ref, AliVEvent *refMC) : |
2a1c7696 | 42 | fRef(ref), |
43 | fRefMC(refMC), | |
44 | fLeading(-1), | |
b63357a0 | 45 | fPID(0x0), |
46 | fAODList(0x0) | |
2f769150 | 47 | { |
06351446 | 48 | // |
4fbb2459 | 49 | // Default constructor. |
06351446 | 50 | // |
0dffcc8a | 51 | } |
7c2974c8 | 52 | |
53 | //_____________________________________________________________________________ | |
aec0ec32 | 54 | AliRsnEvent::AliRsnEvent(const AliRsnEvent &event) : |
2a1c7696 | 55 | TObject(event), |
56 | fRef(event.fRef), | |
57 | fRefMC(event.fRefMC), | |
58 | fLeading(event.fLeading), | |
b63357a0 | 59 | fPID(event.fPID), |
60 | fAODList(event.fAODList) | |
2f769150 | 61 | { |
06351446 | 62 | // |
0dffcc8a | 63 | // Copy constructor. |
06351446 | 64 | // |
2f769150 | 65 | } |
7c2974c8 | 66 | |
67 | //_____________________________________________________________________________ | |
9477aa42 | 68 | AliRsnEvent& AliRsnEvent::operator= (const AliRsnEvent & event) |
0dffcc8a | 69 | { |
06351446 | 70 | // |
71 | // Works in the same way as the copy constructor. | |
72 | // | |
aec0ec32 | 73 | |
f34f960b | 74 | TObject::operator=(event); |
2a1c7696 | 75 | fRef = event.fRef; |
76 | fRefMC = event.fRefMC; | |
77 | fLeading = event.fLeading; | |
c865cb1d | 78 | fPID = event.fPID; |
b63357a0 | 79 | fAODList = event.fAODList; |
5eb970a4 | 80 | |
2a1c7696 | 81 | return (*this); |
0dffcc8a | 82 | } |
7c2974c8 | 83 | |
5faf5a07 | 84 | //_____________________________________________________________________________ |
85 | AliRsnEvent::~AliRsnEvent() | |
86 | { | |
87 | // | |
f34f960b | 88 | // Destructor (does nothing since there are not owned pointers) |
5faf5a07 | 89 | // |
5faf5a07 | 90 | } |
91 | ||
06351446 | 92 | //_____________________________________________________________________________ |
f34f960b | 93 | void AliRsnEvent::SetDaughter(AliRsnDaughter &out, Int_t index, Bool_t fromMC) |
06351446 | 94 | { |
95 | // | |
f34f960b | 96 | // Assigns to the first argument the reference to the i-th track in the ref event. |
97 | // What assignment method to be used will depend on the index and on the type of input. | |
98 | // If the last argument is kTRUE and an MC is referenced, then both fRef and fRefMC will | |
99 | // point to the MC particle (pure MC analysis) | |
06351446 | 100 | // |
2a1c7696 | 101 | |
f34f960b | 102 | // by default the daughter is reset |
103 | // and assigned the used index | |
d7712d44 | 104 | out.Reset(); |
f34f960b | 105 | out.SetRsnID(index); |
d7712d44 | 106 | out.SetOwnerEvent(this); |
d7712d44 | 107 | |
f34f960b | 108 | // check input type |
109 | if (!InputOK()) return; | |
110 | Bool_t inputESD = IsESD(); | |
111 | ||
cceb9957 | 112 | |
f34f960b | 113 | Int_t trueIndex; |
114 | AliRsnDaughter::ERefType type; | |
115 | if (!ConvertAbsoluteIndex(index, trueIndex, type)) { | |
116 | AliError(Form("Failed to convert absolute index %d", index)); | |
117 | return; | |
118 | } | |
119 | switch (type) { | |
120 | case AliRsnDaughter::kTrack: | |
cceb9957 | 121 | if (inputESD) { |
122 | SetDaughterESDtrack(out, trueIndex); | |
123 | ||
124 | } else { | |
125 | SetDaughterAODtrack(out, trueIndex); | |
126 | } | |
f34f960b | 127 | break; |
128 | case AliRsnDaughter::kV0: | |
129 | if (inputESD) SetDaughterESDv0(out, trueIndex); else SetDaughterAODv0(out, trueIndex); | |
130 | break; | |
131 | case AliRsnDaughter::kCascade: | |
132 | if (inputESD) SetDaughterESDcascade(out, trueIndex); else SetDaughterAODcascade(out, trueIndex); | |
133 | break; | |
134 | default: | |
135 | AliError("Unrecognized daughter type"); | |
136 | return; | |
137 | } | |
cceb9957 | 138 | |
139 | // if it is pure MC, the index tells what particle | |
140 | // to be read in the stack of MC particles, otherwise | |
141 | // it is converted into a real collection index | |
142 | if (fromMC) out.SetRef(out.GetRefMC()); | |
7356f978 | 143 | } |
144 | ||
145 | //_____________________________________________________________________________ | |
f34f960b | 146 | AliRsnDaughter AliRsnEvent::GetDaughter(Int_t i, Bool_t fromMC) |
7356f978 | 147 | { |
148 | // | |
f34f960b | 149 | // Returns a daughter set using same criteria as SetDaughter |
7356f978 | 150 | // |
151 | ||
f34f960b | 152 | AliRsnDaughter d; |
153 | SetDaughter(d, i, fromMC); | |
154 | return d; | |
155 | } | |
7356f978 | 156 | |
f34f960b | 157 | //_____________________________________________________________________________ |
158 | void AliRsnEvent::SetDaughterESDtrack(AliRsnDaughter &out, Int_t i) | |
159 | { | |
160 | // | |
161 | // Setup the first argument to the track identified by the index. | |
162 | // When available, adds the MC information and references. | |
163 | // --- | |
164 | // Version #1: ESD tracks | |
165 | // | |
166 | ||
167 | AliESDEvent *esd = (AliESDEvent*)fRef; | |
168 | ||
169 | if (i >= 0 && i < esd->GetNumberOfTracks()) { | |
170 | AliESDtrack *track = esd->GetTrack(i); | |
171 | if (track) { | |
172 | out.SetRef(track); | |
173 | out.SetGood(); | |
174 | // if MC is present, assign label and retrieve corresponding particle | |
175 | if (fRefMC) { | |
176 | out.SetLabel(TMath::Abs(track->GetLabel())); | |
177 | if (!SetMCInfoESD(out)) { | |
178 | AliWarning("Failed assignment of MC info"); | |
179 | } | |
180 | } | |
181 | } else { | |
182 | AliWarning("Null track"); | |
183 | } | |
184 | } else { | |
185 | AliWarning(Form("Overflow: required index = %d, max = %d", i, esd->GetNumberOfTracks())); | |
7356f978 | 186 | } |
e0baff8c | 187 | } |
188 | ||
2e521c29 | 189 | //_____________________________________________________________________________ |
f34f960b | 190 | void AliRsnEvent::SetDaughterAODtrack(AliRsnDaughter &out, Int_t i) |
2e521c29 | 191 | { |
192 | // | |
f34f960b | 193 | // Setup the first argument to the track identified by the index. |
194 | // When available, adds the MC information and references. | |
195 | // --- | |
196 | // Version #2: AOD tracks | |
2e521c29 | 197 | // |
198 | ||
f34f960b | 199 | AliAODEvent *aod = (AliAODEvent*)fRef; |
2a1c7696 | 200 | |
f34f960b | 201 | if (i >= 0 && i < aod->GetNumberOfTracks()) { |
202 | AliAODTrack *track = aod->GetTrack(i); | |
203 | if (track) { | |
204 | out.SetRef(track); | |
205 | out.SetGood(); | |
206 | // if MC is present, assign label and retrieve corresponding particle | |
207 | if (fRefMC) { | |
208 | out.SetLabel(TMath::Abs(track->GetLabel())); | |
209 | if (!SetMCInfoAOD(out)) { | |
210 | AliWarning("Failed assignment of MC info"); | |
211 | } | |
212 | } | |
213 | } else { | |
214 | AliWarning("Null track"); | |
2a1c7696 | 215 | } |
f34f960b | 216 | } else { |
217 | AliWarning(Form("Overflow: required index = %d, max = %d", i, aod->GetNumberOfTracks())); | |
2a1c7696 | 218 | } |
f34f960b | 219 | } |
220 | ||
221 | //_____________________________________________________________________________ | |
222 | void AliRsnEvent::SetDaughterESDv0(AliRsnDaughter &out, Int_t i) | |
223 | { | |
224 | // | |
225 | // Setup the first argument to the track identified by the index. | |
226 | // When available, adds the MC information and references. | |
227 | // --- | |
228 | // Version #3: ESD v0 | |
229 | // | |
2a1c7696 | 230 | |
f34f960b | 231 | if (i >= 0 && i < fRef->GetNumberOfV0s()) { |
232 | AliESDEvent *ev = GetRefESD(); | |
233 | AliESDv0 *v0 = ev->GetV0(i); | |
234 | if (v0) { | |
235 | out.SetRef(v0); | |
236 | out.SetGood(); | |
237 | // if MC is present, retrieve the label of V0 from those of daughters | |
238 | if (fRefMC) { | |
239 | AliMCEvent *mc = (AliMCEvent*)fRefMC; | |
240 | AliESDtrack *tp = ev->GetTrack(v0->GetPindex()); | |
241 | AliESDtrack *tn = ev->GetTrack(v0->GetNindex()); | |
242 | if (mc && tp && tn) { | |
243 | Int_t lp = TMath::Abs(tp->GetLabel()); | |
244 | Int_t ln = TMath::Abs(tn->GetLabel()); | |
245 | TParticle *pp = mc->Stack()->Particle(lp); | |
246 | TParticle *pn = mc->Stack()->Particle(ln); | |
247 | if (pp && pn) { | |
248 | // if their first mothers are the same, the V0 is true | |
249 | // otherwise label remains '-1' --> fake V0 | |
250 | if (pp->GetFirstMother() == pn->GetFirstMother() && pp->GetFirstMother() >= 0) { | |
251 | out.SetLabel(pp->GetFirstMother()); | |
252 | SetMCInfoESD(out); | |
253 | } | |
254 | } | |
255 | } | |
256 | } | |
2a1c7696 | 257 | } |
f34f960b | 258 | } |
259 | } | |
260 | ||
261 | //_____________________________________________________________________________ | |
262 | void AliRsnEvent::SetDaughterAODv0(AliRsnDaughter &out, Int_t i) | |
263 | { | |
264 | // | |
265 | // Setup the first argument to the track identified by the index. | |
266 | // When available, adds the MC information and references. | |
267 | // --- | |
268 | // Version #4: AOD v0 | |
269 | // | |
2a1c7696 | 270 | |
f34f960b | 271 | if (i >= 0 && i < fRef->GetNumberOfV0s()) { |
272 | AliAODEvent *ev = (AliAODEvent*)fRef; | |
273 | AliAODv0 *v0 = ev->GetV0(i); | |
274 | if (v0) { | |
275 | out.SetRef(v0); | |
276 | out.SetGood(); | |
277 | if (fRefMC) { | |
278 | AliAODEvent *mc = (AliAODEvent*)fRefMC; | |
279 | TClonesArray *mcArray = (TClonesArray*)mc->GetList()->FindObject(AliAODMCParticle::StdBranchName()); | |
280 | AliAODTrack *tp = (AliAODTrack*)v0->GetDaughter(0); | |
281 | AliAODTrack *tn = (AliAODTrack*)v0->GetDaughter(1); | |
282 | if (mcArray && tp && tn) { | |
283 | Int_t lp = TMath::Abs(tp->GetLabel()); | |
284 | Int_t ln = TMath::Abs(tn->GetLabel()); | |
285 | AliAODMCParticle *pp = (AliAODMCParticle*)mcArray->At(lp); | |
286 | AliAODMCParticle *pn = (AliAODMCParticle*)mcArray->At(ln); | |
287 | if (pp && pn) { | |
288 | // if their first mothers are the same, the V0 is true | |
289 | // otherwise label remains '-1' --> fake V0 | |
290 | if (pp->GetMother() == pn->GetMother() && pp->GetMother() >= 0) { | |
291 | out.SetLabel(pp->GetMother()); | |
292 | SetMCInfoAOD(out); | |
293 | } | |
294 | } | |
2a1c7696 | 295 | } |
2a1c7696 | 296 | } |
a378358c | 297 | } |
2a1c7696 | 298 | } |
f34f960b | 299 | } |
2a1c7696 | 300 | |
f34f960b | 301 | //_____________________________________________________________________________ |
302 | void AliRsnEvent::SetDaughterESDcascade(AliRsnDaughter &out, Int_t i) | |
303 | { | |
304 | // | |
305 | // Setup the first argument to the track identified by the index. | |
306 | // When available, adds the MC information and references. | |
307 | // --- | |
308 | // Version #3: ESD cascade | |
309 | // | |
310 | ||
311 | if (i >= 0 && i < fRef->GetNumberOfCascades()) { | |
312 | AliESDEvent *ev = GetRefESD(); | |
313 | AliESDcascade *casc = ev->GetCascade(i); | |
314 | if (casc) { | |
315 | out.SetRef(casc); | |
316 | out.SetGood(); | |
317 | if (fRefMC) { | |
318 | ||
319 | } | |
320 | } | |
321 | } | |
2e521c29 | 322 | } |
323 | ||
15d5fd02 | 324 | //_____________________________________________________________________________ |
f34f960b | 325 | void AliRsnEvent::SetDaughterAODcascade(AliRsnDaughter &out, Int_t i) |
15d5fd02 | 326 | { |
327 | // | |
f34f960b | 328 | // Setup the first argument to the track identified by the index. |
329 | // When available, adds the MC information and references. | |
330 | // --- | |
331 | // Version #4: AOD cascade | |
15d5fd02 | 332 | // |
2a1c7696 | 333 | |
f34f960b | 334 | if (i >= 0 && i < fRef->GetNumberOfCascades()) { |
335 | AliAODEvent *ev = GetRefAOD(); | |
336 | AliAODv0 *casc = ev->GetCascade(i); | |
337 | if (casc) { | |
338 | out.SetRef(casc); | |
339 | out.SetGood(); | |
340 | if (fRefMC) { | |
341 | ||
342 | } | |
343 | } | |
344 | } | |
15d5fd02 | 345 | } |
346 | ||
7356f978 | 347 | //_____________________________________________________________________________ |
f34f960b | 348 | Bool_t AliRsnEvent::SetMCInfoESD(AliRsnDaughter &out) |
7356f978 | 349 | { |
350 | // | |
f34f960b | 351 | // Using the label assigned to the daughter, searches for the MC informations: |
352 | // -- MC reference | |
353 | // -- mother | |
7356f978 | 354 | // |
355 | ||
f34f960b | 356 | // if label makes no sense --> failed |
357 | Int_t label = out.GetLabel(); | |
358 | if (label < 0 || !fRefMC) return kFALSE; | |
359 | ||
360 | // get number of particles | |
361 | Int_t nMC = fRefMC->GetNumberOfTracks(); | |
362 | ||
363 | // if label too large --> failed | |
364 | if (label >= nMC) { | |
365 | AliWarning(Form("Stack overflow: track label = %d -- stack maximum = %d", label, nMC)); | |
366 | return kFALSE; | |
367 | } | |
368 | ||
369 | // retrieve particle | |
370 | AliMCEvent *mc = (AliMCEvent*)fRefMC; | |
371 | AliMCParticle *mcPart = (AliMCParticle*)mc->GetTrack(label); | |
372 | ||
373 | // if particle = NULL --> failed | |
374 | if (!mcPart) { | |
375 | AliWarning(Form("Stack discontinuity: label %d refers to a NULL object", label)); | |
376 | return kFALSE; | |
377 | } | |
378 | // otherwise --> success | |
379 | out.SetRefMC(mcPart); | |
380 | ||
381 | // if the particle is not primary, find the mother and get its PDG | |
382 | Int_t imum = mcPart->Particle()->GetFirstMother(); | |
383 | if (imum >= 0 && imum < nMC) { | |
384 | AliMCParticle *mcMother = (AliMCParticle*)mc->GetTrack(imum); | |
385 | if (mcMother) { | |
386 | out.SetMotherPDG(TMath::Abs(mcMother->Particle()->GetPdgCode())); | |
387 | } else { | |
388 | AliWarning(Form("Stack discontinuity: label mother %d refers to a NULL object", imum)); | |
389 | } | |
390 | } else { | |
391 | AliWarning(Form("Stack overflow: mother label = %d -- stack maximum = %d", imum, nMC)); | |
392 | } | |
393 | ||
394 | return kTRUE; | |
7356f978 | 395 | } |
396 | ||
2e521c29 | 397 | //_____________________________________________________________________________ |
f34f960b | 398 | Bool_t AliRsnEvent::SetMCInfoAOD(AliRsnDaughter &out) |
2e521c29 | 399 | { |
400 | // | |
f34f960b | 401 | // Using the label assigned to the daughter, searches for the MC informations: |
402 | // -- MC reference | |
403 | // -- mother | |
2e521c29 | 404 | // |
2a1c7696 | 405 | |
f34f960b | 406 | // if label makes no sense --> failed |
407 | Int_t label = out.GetLabel(); | |
408 | if (label < 0 || !fRefMC) return kFALSE; | |
409 | ||
410 | // retrieve particle | |
411 | AliAODEvent *mc = (AliAODEvent*)fRefMC; | |
412 | TClonesArray *mcArray = (TClonesArray*)mc->GetList()->FindObject(AliAODMCParticle::StdBranchName()); | |
413 | ||
414 | // get number of particles | |
415 | Int_t nMC = mcArray->GetEntriesFast(); | |
416 | ||
417 | // if label too large --> failed | |
418 | if (label >= nMC) { | |
419 | AliWarning(Form("Stack overflow: track label = %d -- stack maximum = %d", label, nMC)); | |
420 | return kFALSE; | |
421 | } | |
422 | ||
423 | // if particle = NULL --> failed | |
424 | AliAODMCParticle *mcPart = (AliAODMCParticle*)mcArray->At(label); | |
425 | if (!mcPart) { | |
426 | AliWarning(Form("Stack discontinuity: label %d refers to a NULL object", label)); | |
427 | return kFALSE; | |
428 | } | |
429 | // otherwise --> success | |
430 | out.SetRefMC(mcPart); | |
431 | ||
432 | // if the particle is not primary, find the mother and get its PDG | |
433 | Int_t imum = mcPart->GetMother(); | |
434 | if (imum >= 0 && imum < nMC) { | |
435 | AliAODMCParticle *mcMother = (AliAODMCParticle*)mcArray->At(imum); | |
436 | if (mcMother) { | |
437 | out.SetMotherPDG(TMath::Abs(mcMother->GetPdgCode())); | |
438 | } else { | |
439 | AliWarning(Form("Stack discontinuity: label mother %d refers to a NULL object", imum)); | |
440 | } | |
441 | } else if (imum >= nMC) { | |
442 | AliWarning(Form("Stack overflow: mother label = %d -- stack maximum = %d", imum, nMC)); | |
443 | } | |
444 | ||
445 | return kTRUE; | |
2e521c29 | 446 | } |
447 | ||
32992791 | 448 | //_____________________________________________________________________________ |
449 | Bool_t AliRsnEvent::ConvertAbsoluteIndex(Int_t index, Int_t &realIndex, AliRsnDaughter::ERefType &type) | |
450 | { | |
451 | // | |
452 | // Using the phylosophy of the absolute index, which loops over | |
453 | // all tracks, V0s and cascades, returns the result of a check | |
454 | // on it (first argument) based on this criterion: | |
455 | // 1) if the absolute ID is smaller than number of tracks, | |
456 | // return itself and the type 'track' | |
457 | // 2) if the absolute ID is larger than number of tracks, subtract it | |
458 | // and if the result is smaller than number of V0s, | |
459 | // return the corresponding V0 index and type | |
460 | // 3) if the absolute ID is larger than number of tracks + V0s, subtract them | |
461 | // and if the result is smaller than number of cascades, | |
462 | // return the corresponding cascade index and type | |
463 | // The results of this check are stored in the reference arguments, while the outcome of | |
464 | // the function is kTRUE if one of these checks was successful, otherwise it is kFALSE, | |
465 | // meaning that the absolute index reached the end. | |
466 | // | |
467 | ||
2a1c7696 | 468 | Int_t nTracks = fRef->GetNumberOfTracks(); |
469 | Int_t nV0s = fRef->GetNumberOfV0s(); | |
470 | Int_t nCascades = fRef->GetNumberOfCascades(); | |
471 | ||
472 | if (index < nTracks) { | |
473 | realIndex = index; | |
474 | type = AliRsnDaughter::kTrack; | |
475 | return kTRUE; | |
476 | } else if (index >= nTracks && index < nTracks + nV0s) { | |
477 | realIndex = index - nTracks; | |
478 | type = AliRsnDaughter::kV0; | |
479 | return kTRUE; | |
480 | } else if (index >= nTracks + nV0s && index < nTracks + nV0s + nCascades) { | |
481 | realIndex = index - nTracks - nV0s; | |
482 | type = AliRsnDaughter::kCascade; | |
483 | return kTRUE; | |
484 | } | |
485 | ||
486 | realIndex = -1; | |
487 | type = AliRsnDaughter::kNoType; | |
488 | return kFALSE; | |
32992791 | 489 | } |
490 | ||
7356f978 | 491 | //_____________________________________________________________________________ |
492 | Int_t AliRsnEvent::ConvertRealIndex(Int_t index, AliRsnDaughter::ERefType type) | |
493 | { | |
494 | // | |
495 | // Translates a pair made by index + object type into the corresponding | |
496 | // absolute index, which is set to -1 in case the real index overflows. | |
497 | // | |
498 | ||
499 | Int_t nTracks = fRef->GetNumberOfTracks(); | |
500 | Int_t nV0s = fRef->GetNumberOfV0s(); | |
501 | Int_t nCascades = fRef->GetNumberOfCascades(); | |
502 | ||
503 | switch (type) { | |
504 | case AliRsnDaughter::kTrack: | |
505 | if (index >= 0 && index < nTracks) | |
506 | return index; | |
507 | else | |
508 | return -1; | |
509 | case AliRsnDaughter::kV0: | |
510 | if (index >= 0 && index < nV0s) | |
511 | return nTracks + index; | |
512 | else | |
513 | return -1; | |
514 | case AliRsnDaughter::kCascade: | |
515 | if (index >= 0 && index < nCascades) | |
516 | return nTracks + nV0s + index; | |
517 | else | |
518 | return -1; | |
519 | default: | |
520 | return -1; | |
521 | } | |
522 | } | |
523 | ||
7c2974c8 | 524 | //_____________________________________________________________________________ |
f34f960b | 525 | Int_t AliRsnEvent::SelectLeadingParticle(AliRsnCutSet *cuts) |
78b94cbd | 526 | { |
527 | // | |
528 | // Searches the collection of all particles with given PID type and charge, | |
529 | // and returns the one with largest momentum, provided that it is greater than 1st argument. | |
530 | // If one specifies AliRsnPID::kUnknown as type or AliRsnDaughter::kNoPID as method, | |
531 | // the check is done over all particles irrespectively of their PID. | |
532 | // If the sign argument is '+' or '-', the check is done over the particles of that charge, | |
533 | // otherwise it is done irrespectively of the charge. | |
534 | // | |
535 | ||
f34f960b | 536 | // check input type |
537 | Bool_t inputESD = IsESD(); | |
538 | if (!inputESD && !IsAOD()) { | |
539 | AliError("Need to process ESD or AOD input"); | |
540 | return -1; | |
541 | } | |
542 | ||
543 | Double_t ptMax = 0.0; | |
2a1c7696 | 544 | Int_t i, nTracks = fRef->GetNumberOfTracks(); |
f34f960b | 545 | |
2a1c7696 | 546 | fLeading = -1; |
547 | AliRsnDaughter leading; | |
2a1c7696 | 548 | |
549 | for (i = 0; i < nTracks; i++) { | |
f34f960b | 550 | if (inputESD) |
551 | SetDaughterESDtrack(leading, i); | |
552 | else | |
553 | SetDaughterAODtrack(leading, i); | |
554 | if (!leading.IsOK()) { | |
555 | AliDebugClass(1, Form("Failed assignment of track %d", i)); | |
556 | continue; | |
2a1c7696 | 557 | } |
f34f960b | 558 | if (cuts && !cuts->IsSelected(&leading)) { |
559 | AliDebugClass(1, Form("Track %d didn't pass cuts", i)); | |
560 | continue; | |
2a1c7696 | 561 | } |
f34f960b | 562 | // check if it has largest momentum |
563 | if (leading.GetRef()->Pt() > ptMax) { | |
564 | ptMax = leading.GetRef()->Pt(); | |
565 | fLeading = i; | |
32992791 | 566 | } |
2a1c7696 | 567 | } |
f34f960b | 568 | |
569 | return fLeading; | |
a378358c | 570 | } |