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