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1 | /************************************************************************** | |
2 | * Copyright(c) 2007-2009, 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 | // Implementation of the ITS-SPD trackleter class | |
19 | // | |
20 | // It retrieves clusters in the pixels (theta and phi) and finds tracklets. | |
21 | // These can be used to extract charged particle multiplicity from the ITS. | |
22 | // | |
23 | // A tracklet consists of two ITS clusters, one in the first pixel layer and | |
24 | // one in the second. The clusters are associated if the differences in | |
25 | // Phi (azimuth) and Theta (polar angle) are within fiducial windows. | |
26 | // In case of multiple candidates the candidate with minimum | |
27 | // distance is selected. | |
28 | // | |
29 | // Two methods return the number of tracklets and the number of unassociated | |
30 | // clusters (i.e. not used in any tracklet) in the first SPD layer | |
31 | // (GetNTracklets and GetNSingleClusters) | |
32 | // | |
33 | // The cuts on phi and theta depend on the interacting system (p-p or Pb-Pb) | |
34 | // and can be set via AliITSRecoParam class | |
35 | // (SetPhiWindow and SetThetaWindow) | |
36 | // | |
37 | // Origin: Tiziano Virgili | |
38 | // | |
39 | // Current support and development: | |
40 | // Domenico Elia, Maria Nicassio (INFN Bari) | |
41 | // Domenico.Elia@ba.infn.it, Maria.Nicassio@ba.infn.it | |
42 | // | |
43 | // Most recent updates: | |
44 | // - multiple association forbidden (fOnlyOneTrackletPerC2 = kTRUE) | |
45 | // - phi definition changed to ALICE convention (0,2*TMath::pi()) | |
46 | // - cluster coordinates taken with GetGlobalXYZ() | |
47 | // - fGeometry removed | |
48 | // - number of fired chips on the two layers | |
49 | // - option to cut duplicates in the overlaps | |
50 | // - options and fiducial cuts via AliITSRecoParam | |
51 | // - move from DeltaZeta to DeltaTheta cut | |
52 | // - update to the new algorithm by Mariella and Jan Fiete | |
53 | // - store also DeltaTheta in the ESD | |
54 | // - less new and delete calls when creating the needed arrays | |
55 | // | |
56 | // - RS: to decrease the number of new/deletes the clusters data are stored | |
57 | // not in float[6] attached to float**, but in 1-D array. | |
58 | // - RS: Clusters are sorted in Z in roder to have the same numbering as in the ITS reco | |
59 | // - RS: Clusters used by ESDtrack are flagged, this information is passed to AliMulitiplicity object | |
60 | // when storing the tracklets and single cluster info | |
61 | // - MN: first MC label of single clusters stored | |
62 | //_________________________________________________________________________ | |
63 | ||
64 | #include <TClonesArray.h> | |
65 | #include <TH1F.h> | |
66 | #include <TH2F.h> | |
67 | #include <TTree.h> | |
68 | #include <TBits.h> | |
69 | #include <TArrayI.h> | |
70 | #include <string.h> | |
71 | ||
72 | #include "AliITSMultReconstructor.h" | |
73 | #include "AliITSReconstructor.h" | |
74 | #include "AliITSRecPoint.h" | |
75 | #include "AliITSRecPointContainer.h" | |
76 | #include "AliITSgeom.h" | |
77 | #include "AliITSgeomTGeo.h" | |
78 | #include "AliITSDetTypeRec.h" | |
79 | #include "AliESDEvent.h" | |
80 | #include "AliESDVertex.h" | |
81 | #include "AliESDtrack.h" | |
82 | #include "AliMultiplicity.h" | |
83 | #include "AliLog.h" | |
84 | #include "TGeoGlobalMagField.h" | |
85 | #include "AliMagF.h" | |
86 | #include "AliESDv0.h" | |
87 | #include "AliV0.h" | |
88 | #include "AliKFParticle.h" | |
89 | #include "AliKFVertex.h" | |
90 | #include "AliRefArray.h" | |
91 | ||
92 | //____________________________________________________________________ | |
93 | ClassImp(AliITSMultReconstructor) | |
94 | ||
95 | ||
96 | //____________________________________________________________________ | |
97 | AliITSMultReconstructor::AliITSMultReconstructor(): | |
98 | fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0), | |
99 | fTracklets(0), | |
100 | fSClusters(0), | |
101 | fNTracklets(0), | |
102 | fNSingleCluster(0), | |
103 | fDPhiWindow(0), | |
104 | fDThetaWindow(0), | |
105 | fPhiShift(0), | |
106 | fRemoveClustersFromOverlaps(0), | |
107 | fPhiOverlapCut(0), | |
108 | fZetaOverlapCut(0), | |
109 | fPhiRotationAngle(0), | |
110 | fScaleDTBySin2T(0), | |
111 | fNStdDev(1.0), | |
112 | fNStdDevSq(1.0), | |
113 | // | |
114 | fCutPxDrSPDin(0.1), | |
115 | fCutPxDrSPDout(0.15), | |
116 | fCutPxDz(0.2), | |
117 | fCutDCArz(0.5), | |
118 | fCutMinElectronProbTPC(0.5), | |
119 | fCutMinElectronProbESD(0.1), | |
120 | fCutMinP(0.05), | |
121 | fCutMinRGamma(2.), | |
122 | fCutMinRK0(1.), | |
123 | fCutMinPointAngle(0.98), | |
124 | fCutMaxDCADauther(0.5), | |
125 | fCutMassGamma(0.03), | |
126 | fCutMassGammaNSigma(5.), | |
127 | fCutMassK0(0.03), | |
128 | fCutMassK0NSigma(5.), | |
129 | fCutChi2cGamma(2.), | |
130 | fCutChi2cK0(2.), | |
131 | fCutGammaSFromDecay(-10.), | |
132 | fCutK0SFromDecay(-10.), | |
133 | fCutMaxDCA(1.), | |
134 | // | |
135 | fHistOn(0), | |
136 | fhClustersDPhiAcc(0), | |
137 | fhClustersDThetaAcc(0), | |
138 | fhClustersDPhiAll(0), | |
139 | fhClustersDThetaAll(0), | |
140 | fhDPhiVsDThetaAll(0), | |
141 | fhDPhiVsDThetaAcc(0), | |
142 | fhetaTracklets(0), | |
143 | fhphiTracklets(0), | |
144 | fhetaClustersLay1(0), | |
145 | fhphiClustersLay1(0), | |
146 | // | |
147 | fDPhiShift(0), | |
148 | fDPhiWindow2(0), | |
149 | fDThetaWindow2(0), | |
150 | fPartners(0), | |
151 | fAssociatedLay1(0), | |
152 | fMinDists(0), | |
153 | fBlackList(0), | |
154 | // | |
155 | fCreateClustersCopy(0), | |
156 | fClustersLoaded(0), | |
157 | fRecoDone(0), | |
158 | fSPDSeg() | |
159 | { | |
160 | for (int i=0;i<2;i++) { | |
161 | fNFiredChips[i] = 0; | |
162 | fClArr[i] = 0; | |
163 | for (int j=0;j<2;j++) fUsedClusLay[i][j] = 0; | |
164 | fDetectorIndexClustersLay[i] = 0; | |
165 | fOverlapFlagClustersLay[i] = 0; | |
166 | fNClustersLay[i] = 0; | |
167 | fClustersLay[i] = 0; | |
168 | } | |
169 | // Method to reconstruct the charged particles multiplicity with the | |
170 | // SPD (tracklets). | |
171 | ||
172 | SetHistOn(); | |
173 | ||
174 | if(AliITSReconstructor::GetRecoParam()) { | |
175 | SetPhiWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiWindow()); | |
176 | SetThetaWindow(AliITSReconstructor::GetRecoParam()->GetTrackleterThetaWindow()); | |
177 | SetPhiShift(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiShift()); | |
178 | SetRemoveClustersFromOverlaps(AliITSReconstructor::GetRecoParam()->GetTrackleterRemoveClustersFromOverlaps()); | |
179 | SetPhiOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiOverlapCut()); | |
180 | SetZetaOverlapCut(AliITSReconstructor::GetRecoParam()->GetTrackleterZetaOverlapCut()); | |
181 | SetPhiRotationAngle(AliITSReconstructor::GetRecoParam()->GetTrackleterPhiRotationAngle()); | |
182 | SetNStdDev(AliITSReconstructor::GetRecoParam()->GetTrackleterNStdDevCut()); | |
183 | SetScaleDThetaBySin2T(AliITSReconstructor::GetRecoParam()->GetTrackleterScaleDThetaBySin2T()); | |
184 | // | |
185 | SetCutPxDrSPDin(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDin()); | |
186 | SetCutPxDrSPDout(AliITSReconstructor::GetRecoParam()->GetMultCutPxDrSPDout()); | |
187 | SetCutPxDz(AliITSReconstructor::GetRecoParam()->GetMultCutPxDz()); | |
188 | SetCutDCArz(AliITSReconstructor::GetRecoParam()->GetMultCutDCArz()); | |
189 | SetCutMinElectronProbTPC(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbTPC()); | |
190 | SetCutMinElectronProbESD(AliITSReconstructor::GetRecoParam()->GetMultCutMinElectronProbESD()); | |
191 | SetCutMinP(AliITSReconstructor::GetRecoParam()->GetMultCutMinP()); | |
192 | SetCutMinRGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMinRGamma()); | |
193 | SetCutMinRK0(AliITSReconstructor::GetRecoParam()->GetMultCutMinRK0()); | |
194 | SetCutMinPointAngle(AliITSReconstructor::GetRecoParam()->GetMultCutMinPointAngle()); | |
195 | SetCutMaxDCADauther(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCADauther()); | |
196 | SetCutMassGamma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGamma()); | |
197 | SetCutMassGammaNSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassGammaNSigma()); | |
198 | SetCutMassK0(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0()); | |
199 | SetCutMassK0NSigma(AliITSReconstructor::GetRecoParam()->GetMultCutMassK0NSigma()); | |
200 | SetCutChi2cGamma(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cGamma()); | |
201 | SetCutChi2cK0(AliITSReconstructor::GetRecoParam()->GetMultCutChi2cK0()); | |
202 | SetCutGammaSFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutGammaSFromDecay()); | |
203 | SetCutK0SFromDecay(AliITSReconstructor::GetRecoParam()->GetMultCutK0SFromDecay()); | |
204 | SetCutMaxDCA(AliITSReconstructor::GetRecoParam()->GetMultCutMaxDCA()); | |
205 | // | |
206 | } else { | |
207 | SetPhiWindow(); | |
208 | SetThetaWindow(); | |
209 | SetPhiShift(); | |
210 | SetRemoveClustersFromOverlaps(); | |
211 | SetPhiOverlapCut(); | |
212 | SetZetaOverlapCut(); | |
213 | SetPhiRotationAngle(); | |
214 | ||
215 | // | |
216 | SetCutPxDrSPDin(); | |
217 | SetCutPxDrSPDout(); | |
218 | SetCutPxDz(); | |
219 | SetCutDCArz(); | |
220 | SetCutMinElectronProbTPC(); | |
221 | SetCutMinElectronProbESD(); | |
222 | SetCutMinP(); | |
223 | SetCutMinRGamma(); | |
224 | SetCutMinRK0(); | |
225 | SetCutMinPointAngle(); | |
226 | SetCutMaxDCADauther(); | |
227 | SetCutMassGamma(); | |
228 | SetCutMassGammaNSigma(); | |
229 | SetCutMassK0(); | |
230 | SetCutMassK0NSigma(); | |
231 | SetCutChi2cGamma(); | |
232 | SetCutChi2cK0(); | |
233 | SetCutGammaSFromDecay(); | |
234 | SetCutK0SFromDecay(); | |
235 | SetCutMaxDCA(); | |
236 | } | |
237 | // | |
238 | fTracklets = 0; | |
239 | fSClusters = 0; | |
240 | // | |
241 | // definition of histograms | |
242 | Bool_t oldStatus = TH1::AddDirectoryStatus(); | |
243 | TH1::AddDirectory(kFALSE); | |
244 | ||
245 | fhClustersDPhiAcc = new TH1F("dphiacc", "dphi", 100,-0.1,0.1); | |
246 | fhClustersDThetaAcc = new TH1F("dthetaacc","dtheta",100,-0.1,0.1); | |
247 | ||
248 | fhDPhiVsDThetaAcc = new TH2F("dphiVsDthetaAcc","",100,-0.1,0.1,100,-0.1,0.1); | |
249 | ||
250 | fhClustersDPhiAll = new TH1F("dphiall", "dphi", 100,0.0,0.5); | |
251 | fhClustersDThetaAll = new TH1F("dthetaall","dtheta",100,0.0,0.5); | |
252 | ||
253 | fhDPhiVsDThetaAll = new TH2F("dphiVsDthetaAll","",100,0.,0.5,100,0.,0.5); | |
254 | ||
255 | fhetaTracklets = new TH1F("etaTracklets", "eta", 100,-2.,2.); | |
256 | fhphiTracklets = new TH1F("phiTracklets", "phi", 100, 0., 2*TMath::Pi()); | |
257 | fhetaClustersLay1 = new TH1F("etaClustersLay1", "etaCl1", 100,-2.,2.); | |
258 | fhphiClustersLay1 = new TH1F("phiClustersLay1", "phiCl1", 100, 0., 2*TMath::Pi()); | |
259 | for (int i=2;i--;) fStoreRefs[i][0] = fStoreRefs[i][1] = kFALSE; | |
260 | TH1::AddDirectory(oldStatus); | |
261 | } | |
262 | ||
263 | //______________________________________________________________________ | |
264 | AliITSMultReconstructor::AliITSMultReconstructor(const AliITSMultReconstructor &mr) : | |
265 | AliTrackleter(mr), | |
266 | fDetTypeRec(0),fESDEvent(0),fTreeRP(0),fTreeRPMix(0), | |
267 | fTracklets(0), | |
268 | fSClusters(0), | |
269 | fNTracklets(0), | |
270 | fNSingleCluster(0), | |
271 | fDPhiWindow(0), | |
272 | fDThetaWindow(0), | |
273 | fPhiShift(0), | |
274 | fRemoveClustersFromOverlaps(0), | |
275 | fPhiOverlapCut(0), | |
276 | fZetaOverlapCut(0), | |
277 | fPhiRotationAngle(0), | |
278 | fScaleDTBySin2T(0), | |
279 | fNStdDev(1.0), | |
280 | fNStdDevSq(1.0), | |
281 | // | |
282 | fCutPxDrSPDin(0.1), | |
283 | fCutPxDrSPDout(0.15), | |
284 | fCutPxDz(0.2), | |
285 | fCutDCArz(0.5), | |
286 | fCutMinElectronProbTPC(0.5), | |
287 | fCutMinElectronProbESD(0.1), | |
288 | fCutMinP(0.05), | |
289 | fCutMinRGamma(2.), | |
290 | fCutMinRK0(1.), | |
291 | fCutMinPointAngle(0.98), | |
292 | fCutMaxDCADauther(0.5), | |
293 | fCutMassGamma(0.03), | |
294 | fCutMassGammaNSigma(5.), | |
295 | fCutMassK0(0.03), | |
296 | fCutMassK0NSigma(5.), | |
297 | fCutChi2cGamma(2.), | |
298 | fCutChi2cK0(2.), | |
299 | fCutGammaSFromDecay(-10.), | |
300 | fCutK0SFromDecay(-10.), | |
301 | fCutMaxDCA(1.), | |
302 | // | |
303 | fHistOn(0), | |
304 | fhClustersDPhiAcc(0), | |
305 | fhClustersDThetaAcc(0), | |
306 | fhClustersDPhiAll(0), | |
307 | fhClustersDThetaAll(0), | |
308 | fhDPhiVsDThetaAll(0), | |
309 | fhDPhiVsDThetaAcc(0), | |
310 | fhetaTracklets(0), | |
311 | fhphiTracklets(0), | |
312 | fhetaClustersLay1(0), | |
313 | fhphiClustersLay1(0), | |
314 | fDPhiShift(0), | |
315 | fDPhiWindow2(0), | |
316 | fDThetaWindow2(0), | |
317 | fPartners(0), | |
318 | fAssociatedLay1(0), | |
319 | fMinDists(0), | |
320 | fBlackList(0), | |
321 | // | |
322 | fCreateClustersCopy(0), | |
323 | fClustersLoaded(0), | |
324 | fRecoDone(0), | |
325 | fSPDSeg() | |
326 | { | |
327 | // Copy constructor :!!! RS ATTENTION: old c-tor reassigned the pointers instead of creating a new copy -> would crash on delete | |
328 | AliError("May not use"); | |
329 | } | |
330 | ||
331 | //______________________________________________________________________ | |
332 | AliITSMultReconstructor& AliITSMultReconstructor::operator=(const AliITSMultReconstructor& mr){ | |
333 | // Assignment operator | |
334 | if (this != &mr) { | |
335 | this->~AliITSMultReconstructor(); | |
336 | new(this) AliITSMultReconstructor(mr); | |
337 | } | |
338 | return *this; | |
339 | } | |
340 | ||
341 | //______________________________________________________________________ | |
342 | AliITSMultReconstructor::~AliITSMultReconstructor(){ | |
343 | // Destructor | |
344 | ||
345 | // delete histograms | |
346 | delete fhClustersDPhiAcc; | |
347 | delete fhClustersDThetaAcc; | |
348 | delete fhClustersDPhiAll; | |
349 | delete fhClustersDThetaAll; | |
350 | delete fhDPhiVsDThetaAll; | |
351 | delete fhDPhiVsDThetaAcc; | |
352 | delete fhetaTracklets; | |
353 | delete fhphiTracklets; | |
354 | delete fhetaClustersLay1; | |
355 | delete fhphiClustersLay1; | |
356 | // | |
357 | // delete arrays | |
358 | for(Int_t i=0; i<fNTracklets; i++) delete [] fTracklets[i]; | |
359 | ||
360 | for(Int_t i=0; i<fNSingleCluster; i++) delete [] fSClusters[i]; | |
361 | ||
362 | // | |
363 | for (int i=0;i<2;i++) { | |
364 | delete[] fClustersLay[i]; | |
365 | delete[] fDetectorIndexClustersLay[i]; | |
366 | delete[] fOverlapFlagClustersLay[i]; | |
367 | delete fClArr[i]; | |
368 | for (int j=0;j<2;j++) delete fUsedClusLay[i][j]; | |
369 | } | |
370 | delete [] fTracklets; | |
371 | delete [] fSClusters; | |
372 | // | |
373 | delete[] fPartners; fPartners = 0; | |
374 | delete[] fMinDists; fMinDists = 0; | |
375 | delete fBlackList; fBlackList = 0; | |
376 | // | |
377 | } | |
378 | ||
379 | //____________________________________________________________________ | |
380 | void AliITSMultReconstructor::Reconstruct(AliESDEvent* esd, TTree* treeRP) | |
381 | { | |
382 | if (!treeRP) { AliError(" Invalid ITS cluster tree !\n"); return; } | |
383 | if (!esd) {AliError("ESDEvent is not available, use old reconstructor"); return;} | |
384 | // reset counters | |
385 | if (fMult) delete fMult; fMult = 0; | |
386 | fNClustersLay[0] = 0; | |
387 | fNClustersLay[1] = 0; | |
388 | fNTracklets = 0; | |
389 | fNSingleCluster = 0; | |
390 | // | |
391 | fESDEvent = esd; | |
392 | fTreeRP = treeRP; | |
393 | // | |
394 | // >>>> RS: this part is equivalent to former AliITSVertexer::FindMultiplicity | |
395 | // | |
396 | // see if there is a SPD vertex | |
397 | Bool_t isVtxOK=kTRUE, isCosmics=kFALSE; | |
398 | AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD(); | |
399 | if (!vtx || vtx->GetNContributors()<1) isVtxOK = kFALSE; | |
400 | if (vtx && strstr(vtx->GetTitle(),"cosmics")) { | |
401 | isVtxOK = kFALSE; | |
402 | isCosmics = kTRUE; | |
403 | } | |
404 | // | |
405 | if (!isVtxOK) { | |
406 | if (!isCosmics) { | |
407 | AliDebug(1,"Tracklets multiplicity not determined because the primary vertex was not found"); | |
408 | AliDebug(1,"Just counting the number of cluster-fired chips on the SPD layers"); | |
409 | } | |
410 | vtx = 0; | |
411 | } | |
412 | if(vtx){ | |
413 | float vtxf[3] = {vtx->GetX(),vtx->GetY(),vtx->GetZ()}; | |
414 | FindTracklets(vtxf); | |
415 | } | |
416 | else { | |
417 | FindTracklets(0); | |
418 | } | |
419 | // | |
420 | CreateMultiplicityObject(); | |
421 | } | |
422 | ||
423 | //____________________________________________________________________ | |
424 | void AliITSMultReconstructor::Reconstruct(TTree* clusterTree, Float_t* vtx, Float_t* /* vtxRes*/) { | |
425 | // | |
426 | // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode | |
427 | ||
428 | if (fMult) delete fMult; fMult = 0; | |
429 | fNClustersLay[0] = 0; | |
430 | fNClustersLay[1] = 0; | |
431 | fNTracklets = 0; | |
432 | fNSingleCluster = 0; | |
433 | // | |
434 | if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; } | |
435 | // | |
436 | fESDEvent = 0; | |
437 | SetTreeRP(clusterTree); | |
438 | // | |
439 | FindTracklets(vtx); | |
440 | // | |
441 | } | |
442 | ||
443 | ||
444 | //____________________________________________________________________ | |
445 | void AliITSMultReconstructor::ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, Float_t* vtx, Float_t*) | |
446 | { | |
447 | // | |
448 | // RS NOTE - this is old reconstructor invocation, to be used from VertexFinder and in analysis mode | |
449 | ||
450 | if (fMult) delete fMult; fMult = 0; | |
451 | fNClustersLay[0] = 0; | |
452 | fNClustersLay[1] = 0; | |
453 | fNTracklets = 0; | |
454 | fNSingleCluster = 0; | |
455 | // | |
456 | if (!clusterTree) { AliError(" Invalid ITS cluster tree !\n"); return; } | |
457 | if (!clusterTreeMix) { AliError(" Invalid ITS cluster tree 2nd event !\n"); return; } | |
458 | // | |
459 | fESDEvent = 0; | |
460 | SetTreeRP(clusterTree); | |
461 | SetTreeRPMix(clusterTreeMix); | |
462 | // | |
463 | FindTracklets(vtx); | |
464 | // | |
465 | } | |
466 | ||
467 | ||
468 | //____________________________________________________________________ | |
469 | void AliITSMultReconstructor::FindTracklets(const Float_t *vtx) | |
470 | { | |
471 | // - calls LoadClusterArrays that finds the position of the clusters | |
472 | // (in global coord) | |
473 | ||
474 | // - convert the cluster coordinates to theta, phi (seen from the | |
475 | // interaction vertex). Clusters in the inner layer can be now | |
476 | // rotated for combinatorial studies | |
477 | // - makes an array of tracklets | |
478 | // | |
479 | // After this method has been called, the clusters of the two layers | |
480 | // and the tracklets can be retrieved by calling the Get'er methods. | |
481 | ||
482 | ||
483 | // Find tracklets converging to vertex | |
484 | // | |
485 | LoadClusterArrays(fTreeRP,fTreeRPMix); | |
486 | // flag clusters used by ESD tracks | |
487 | if (fESDEvent) ProcessESDTracks(); | |
488 | fRecoDone = kTRUE; | |
489 | ||
490 | if (!vtx) return; | |
491 | ||
492 | InitAux(); | |
493 | ||
494 | // find the tracklets | |
495 | AliDebug(1,"Looking for tracklets... "); | |
496 | ||
497 | ClusterPos2Angles(vtx); // convert cluster position to angles wrt vtx | |
498 | // | |
499 | // Step1: find all tracklets allowing double assocation: | |
500 | int found = 1; | |
501 | while (found > 0) { | |
502 | found = 0; | |
503 | for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) found += AssociateClusterOfL1(iC1); | |
504 | } | |
505 | // | |
506 | // Step2: store tracklets; remove used clusters | |
507 | for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) StoreTrackletForL2Cluster(iC2); | |
508 | // | |
509 | // store unused single clusters of L1 | |
510 | StoreL1Singles(); | |
511 | // | |
512 | AliDebug(1,Form("%d tracklets found", fNTracklets)); | |
513 | } | |
514 | ||
515 | //____________________________________________________________________ | |
516 | void AliITSMultReconstructor::CreateMultiplicityObject() | |
517 | { | |
518 | // create AliMultiplicity object and store it in the ESD event | |
519 | // | |
520 | TBits fastOrFiredMap,firedChipMap; | |
521 | if (fDetTypeRec) { | |
522 | fastOrFiredMap = fDetTypeRec->GetFastOrFiredMap(); | |
523 | firedChipMap = fDetTypeRec->GetFiredChipMap(fTreeRP); | |
524 | } | |
525 | // | |
526 | fMult = new AliMultiplicity(fNTracklets,fNSingleCluster,fNFiredChips[0],fNFiredChips[1],fastOrFiredMap); | |
527 | fMult->SetMultTrackRefs(kTRUE); | |
528 | // store some details of reco: | |
529 | fMult->SetScaleDThetaBySin2T(fScaleDTBySin2T); | |
530 | fMult->SetDPhiWindow2(fDPhiWindow2); | |
531 | fMult->SetDThetaWindow2(fDThetaWindow2); | |
532 | fMult->SetDPhiShift(fDPhiShift); | |
533 | fMult->SetNStdDev(fNStdDev); | |
534 | // | |
535 | fMult->SetFiredChipMap(firedChipMap); | |
536 | AliITSRecPointContainer* rcont = AliITSRecPointContainer::Instance(); | |
537 | fMult->SetITSClusters(0,rcont->GetNClustersInLayer(1,fTreeRP)); | |
538 | for(Int_t kk=2;kk<=6;kk++) fMult->SetITSClusters(kk-1,rcont->GetNClustersInLayerFast(kk)); | |
539 | // | |
540 | UInt_t shared[100]; | |
541 | AliRefArray *refs[2][2] = {{0,0},{0,0}}; | |
542 | for (int il=2;il--;) | |
543 | for (int it=2;it--;) // tracklet_clusters->track references to stor | |
544 | if (fStoreRefs[il][it]) refs[il][it] = new AliRefArray(fNTracklets,0); | |
545 | // | |
546 | for (int i=fNTracklets;i--;) { | |
547 | float* tlInfo = fTracklets[i]; | |
548 | fMult->SetTrackletData(i,tlInfo); | |
549 | for (int itp=0;itp<2;itp++) { | |
550 | for (int ilr=0;ilr<2;ilr++) { | |
551 | if (!fStoreRefs[ilr][itp]) continue; // nothing to store | |
552 | int clID = int(tlInfo[ilr ? kClID2:kClID1]); | |
553 | int nref = fUsedClusLay[ilr][itp]->GetReferences(clID,shared,100); | |
554 | if (!nref) continue; | |
555 | else if (nref==1) refs[ilr][itp]->AddReference(i,shared[0]); | |
556 | else refs[ilr][itp]->AddReferences(i,shared,nref); | |
557 | } | |
558 | } | |
559 | } | |
560 | fMult->AttachTracklet2TrackRefs(refs[0][0],refs[0][1],refs[1][0],refs[1][1]); | |
561 | // | |
562 | AliRefArray *refsc[2] = {0,0}; | |
563 | for (int it=2;it--;) if (fStoreRefs[0][it]) refsc[it] = new AliRefArray(fNClustersLay[0]); | |
564 | for (int i=fNSingleCluster;i--;) { | |
565 | float* clInfo = fSClusters[i]; | |
566 | fMult->SetSingleClusterData(i,clInfo); | |
567 | int clID = int(clInfo[kSCID]); | |
568 | for (int itp=0;itp<2;itp++) { | |
569 | if (!fStoreRefs[0][itp]) continue; | |
570 | int nref = fUsedClusLay[0][itp]->GetReferences(clID,shared,100); | |
571 | if (!nref) continue; | |
572 | else if (nref==1) refsc[itp]->AddReference(i,shared[0]); | |
573 | else refsc[itp]->AddReferences(i,shared,nref); | |
574 | } | |
575 | } | |
576 | fMult->AttachCluster2TrackRefs(refsc[0],refsc[1]); | |
577 | fMult->CompactBits(); | |
578 | // | |
579 | } | |
580 | ||
581 | ||
582 | //____________________________________________________________________ | |
583 | void AliITSMultReconstructor::LoadClusterArrays(TTree* tree, TTree* treeMix) | |
584 | { | |
585 | // load cluster info and prepare tracklets arrays | |
586 | // | |
587 | if (AreClustersLoaded()) {AliInfo("Clusters are already loaded"); return;} | |
588 | LoadClusterArrays(tree,0); | |
589 | LoadClusterArrays(treeMix ? treeMix:tree,1); | |
590 | int nmaxT = TMath::Min(fNClustersLay[0], fNClustersLay[1]); | |
591 | if (fTracklets) delete[] fTracklets; | |
592 | fTracklets = new Float_t*[nmaxT]; | |
593 | memset(fTracklets,0,nmaxT*sizeof(Float_t*)); | |
594 | // | |
595 | if (fSClusters) delete[] fSClusters; | |
596 | fSClusters = new Float_t*[fNClustersLay[0]]; | |
597 | memset(fSClusters,0,fNClustersLay[0]*sizeof(Float_t*)); | |
598 | // | |
599 | AliDebug(1,Form("(clusters in layer 1 : %d, layer 2: %d)",fNClustersLay[0],fNClustersLay[1])); | |
600 | AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1])); | |
601 | SetClustersLoaded(); | |
602 | } | |
603 | ||
604 | //____________________________________________________________________ | |
605 | void AliITSMultReconstructor::LoadClusterArrays(TTree* itsClusterTree, int il) | |
606 | { | |
607 | // This method | |
608 | // - gets the clusters from the cluster tree for layer il | |
609 | // - convert them into global coordinates | |
610 | // - store them in the internal arrays | |
611 | // - count the number of cluster-fired chips | |
612 | // | |
613 | // RS: This method was strongly modified wrt original. In order to have the same numbering | |
614 | // of clusters as in the ITS reco I had to introduce sorting in Z | |
615 | // Also note that now the clusters data are stored not in float[6] attached to float**, but in 1-D array | |
616 | AliDebug(1,Form("Loading clusters and cluster-fired chips for layer %d",il)); | |
617 | // | |
618 | fNClustersLay[il] = 0; | |
619 | fNFiredChips[il] = 0; | |
620 | for (int i=2;i--;) fStoreRefs[il][i] = kFALSE; | |
621 | // | |
622 | AliITSRecPointContainer* rpcont = 0; | |
623 | static TClonesArray statITSrec("AliITSRecPoint"); | |
624 | static TObjArray clArr(100); | |
625 | TBranch* branch = 0; | |
626 | TClonesArray* itsClusters = 0; | |
627 | // | |
628 | if (!fCreateClustersCopy) { | |
629 | rpcont=AliITSRecPointContainer::Instance(); | |
630 | itsClusters = rpcont->FetchClusters(0,itsClusterTree); | |
631 | if(!rpcont->IsSPDActive()){ | |
632 | AliWarning("No SPD rec points found, multiplicity not calculated"); | |
633 | return; | |
634 | } | |
635 | } | |
636 | else { | |
637 | itsClusters = &statITSrec; | |
638 | branch = itsClusterTree->GetBranch("ITSRecPoints"); | |
639 | branch->SetAddress(&itsClusters); | |
640 | if (!fClArr[il]) fClArr[il] = new TClonesArray("AliITSRecPoint",100); | |
641 | } | |
642 | // | |
643 | // count clusters | |
644 | // loop over the SPD subdetectors | |
645 | int nclLayer = 0; | |
646 | int detMin = TMath::Max(0,AliITSgeomTGeo::GetModuleIndex(il+1,1,1)); | |
647 | int detMax = AliITSgeomTGeo::GetModuleIndex(il+2,1,1); | |
648 | for (int idt=detMin;idt<detMax;idt++) { | |
649 | if (!fCreateClustersCopy) itsClusters = rpcont->UncheckedGetClusters(idt); | |
650 | else branch->GetEvent(idt); | |
651 | int nClusters = itsClusters->GetEntriesFast(); | |
652 | if (!nClusters) continue; | |
653 | Int_t nClustersInChip[5] = {0,0,0,0,0}; | |
654 | while(nClusters--) { | |
655 | AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters); | |
656 | if (!cluster) continue; | |
657 | if (fCreateClustersCopy) cluster = new ((*fClArr[il])[nclLayer]) AliITSRecPoint(*cluster); | |
658 | clArr.AddAtAndExpand(cluster,nclLayer++); | |
659 | Int_t chipNo = fSPDSeg.GetChipFromLocal(0,cluster->GetDetLocalZ()); | |
660 | if(chipNo>=0)nClustersInChip[ chipNo ]++; | |
661 | } | |
662 | for(Int_t ifChip=5;ifChip--;) if (nClustersInChip[ifChip]) fNFiredChips[il]++; | |
663 | } | |
664 | // sort the clusters in Z (to have the same numbering as in ITS reco | |
665 | Float_t *z = new Float_t[nclLayer]; | |
666 | Int_t *index = new Int_t[nclLayer]; | |
667 | for (int ic=0;ic<nclLayer;ic++) z[ic] = ((AliITSRecPoint*)clArr[ic])->GetZ(); | |
668 | TMath::Sort(nclLayer,z,index,kFALSE); | |
669 | Float_t* clustersLay = new Float_t[nclLayer*kClNPar]; | |
670 | Int_t* detectorIndexClustersLay = new Int_t[nclLayer]; | |
671 | Bool_t* overlapFlagClustersLay = new Bool_t[nclLayer]; | |
672 | // | |
673 | for (int ic=0;ic<nclLayer;ic++) { | |
674 | AliITSRecPoint* cluster = (AliITSRecPoint*)clArr[index[ic]]; | |
675 | float* clPar = &clustersLay[ic*kClNPar]; | |
676 | // | |
677 | cluster->GetGlobalXYZ( clPar ); | |
678 | detectorIndexClustersLay[ic] = cluster->GetDetectorIndex(); | |
679 | overlapFlagClustersLay[ic] = kFALSE; | |
680 | for (Int_t i=3;i--;) clPar[kClMC0+i] = cluster->GetLabel(i); | |
681 | } | |
682 | clArr.Clear(); | |
683 | delete[] z; | |
684 | delete[] index; | |
685 | // | |
686 | if (fOverlapFlagClustersLay[il]) delete[] fOverlapFlagClustersLay[il]; | |
687 | fOverlapFlagClustersLay[il] = overlapFlagClustersLay; | |
688 | // | |
689 | if (fDetectorIndexClustersLay[il]) delete[] fDetectorIndexClustersLay[il]; | |
690 | fDetectorIndexClustersLay[il] = detectorIndexClustersLay; | |
691 | // | |
692 | for (int it=0;it<2;it++) { | |
693 | if (fUsedClusLay[il][it]) delete fUsedClusLay[il][it]; | |
694 | fUsedClusLay[il][it] = new AliRefArray(nclLayer); | |
695 | } | |
696 | // | |
697 | if (fClustersLay[il]) delete[] fClustersLay[il]; | |
698 | fClustersLay[il] = clustersLay; | |
699 | fNClustersLay[il] = nclLayer; | |
700 | // | |
701 | } | |
702 | ||
703 | //____________________________________________________________________ | |
704 | void AliITSMultReconstructor::LoadClusterFiredChips(TTree* itsClusterTree) { | |
705 | // This method | |
706 | // - gets the clusters from the cluster tree | |
707 | // - counts the number of (cluster)fired chips | |
708 | ||
709 | AliDebug(1,"Loading cluster-fired chips ..."); | |
710 | ||
711 | fNFiredChips[0] = 0; | |
712 | fNFiredChips[1] = 0; | |
713 | ||
714 | AliITSRecPointContainer* rpcont=AliITSRecPointContainer::Instance(); | |
715 | TClonesArray* itsClusters=NULL; | |
716 | rpcont->FetchClusters(0,itsClusterTree); | |
717 | if(!rpcont->IsSPDActive()){ | |
718 | AliWarning("No SPD rec points found, multiplicity not calculated"); | |
719 | return; | |
720 | } | |
721 | ||
722 | // loop over the its subdetectors | |
723 | Int_t nSPDmodules=AliITSgeomTGeo::GetModuleIndex(3,1,1); | |
724 | for (Int_t iIts=0; iIts < nSPDmodules; iIts++) { | |
725 | itsClusters=rpcont->UncheckedGetClusters(iIts); | |
726 | Int_t nClusters = itsClusters->GetEntriesFast(); | |
727 | ||
728 | // number of clusters in each chip of the current module | |
729 | Int_t nClustersInChip[5] = {0,0,0,0,0}; | |
730 | Int_t layer = 0; | |
731 | ||
732 | // loop over clusters | |
733 | while(nClusters--) { | |
734 | AliITSRecPoint* cluster = (AliITSRecPoint*)itsClusters->UncheckedAt(nClusters); | |
735 | ||
736 | layer = cluster->GetLayer(); | |
737 | if (layer>1) continue; | |
738 | ||
739 | // find the chip for the current cluster | |
740 | Float_t locz = cluster->GetDetLocalZ(); | |
741 | Int_t iChip = fSPDSeg.GetChipFromLocal(0,locz); | |
742 | if (iChip>=0) nClustersInChip[iChip]++; | |
743 | ||
744 | }// end of cluster loop | |
745 | ||
746 | // get number of fired chips in the current module | |
747 | for(Int_t ifChip=0; ifChip<5; ifChip++) { | |
748 | if(nClustersInChip[ifChip] >= 1) fNFiredChips[layer]++; | |
749 | } | |
750 | ||
751 | } // end of its "subdetector" loop | |
752 | ||
753 | ||
754 | AliDebug(1,Form("(cluster-fired chips in layer 1 : %d, layer 2: %d)",fNFiredChips[0],fNFiredChips[1])); | |
755 | } | |
756 | //____________________________________________________________________ | |
757 | void | |
758 | AliITSMultReconstructor::SaveHists() { | |
759 | // This method save the histograms on the output file | |
760 | // (only if fHistOn is TRUE). | |
761 | ||
762 | if (!fHistOn) | |
763 | return; | |
764 | ||
765 | fhClustersDPhiAll->Write(); | |
766 | fhClustersDThetaAll->Write(); | |
767 | fhDPhiVsDThetaAll->Write(); | |
768 | ||
769 | fhClustersDPhiAcc->Write(); | |
770 | fhClustersDThetaAcc->Write(); | |
771 | fhDPhiVsDThetaAcc->Write(); | |
772 | ||
773 | fhetaTracklets->Write(); | |
774 | fhphiTracklets->Write(); | |
775 | fhetaClustersLay1->Write(); | |
776 | fhphiClustersLay1->Write(); | |
777 | } | |
778 | ||
779 | //____________________________________________________________________ | |
780 | void AliITSMultReconstructor::FlagClustersInOverlapRegions (Int_t iC1, Int_t iC2WithBestDist) { | |
781 | ||
782 | Float_t distClSameMod=0.; | |
783 | Float_t distClSameModMin=0.; | |
784 | Int_t iClOverlap =0; | |
785 | Float_t meanRadiusLay1 = 3.99335; // average radius inner layer | |
786 | Float_t meanRadiusLay2 = 7.37935; // average radius outer layer; | |
787 | ||
788 | Float_t zproj1=0.; | |
789 | Float_t zproj2=0.; | |
790 | Float_t deZproj=0.; | |
791 | Float_t* clPar1 = GetClusterLayer1(iC1); | |
792 | Float_t* clPar2B = GetClusterLayer2(iC2WithBestDist); | |
793 | // Loop on inner layer clusters | |
794 | for (Int_t iiC1=0; iiC1<fNClustersLay[0]; iiC1++) { | |
795 | if (!fOverlapFlagClustersLay[0][iiC1]) { | |
796 | // only for adjacent modules | |
797 | if ((TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==4)|| | |
798 | (TMath::Abs(fDetectorIndexClustersLay[0][iC1]-fDetectorIndexClustersLay[0][iiC1])==76)) { | |
799 | Float_t *clPar11 = GetClusterLayer1(iiC1); | |
800 | Float_t dePhi=TMath::Abs(clPar11[kClPh]-clPar1[kClPh]); | |
801 | if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi; | |
802 | ||
803 | zproj1=meanRadiusLay1/TMath::Tan(clPar1[kClTh]); | |
804 | zproj2=meanRadiusLay1/TMath::Tan(clPar11[kClTh]); | |
805 | ||
806 | deZproj=TMath::Abs(zproj1-zproj2); | |
807 | ||
808 | distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2)); | |
809 | if (distClSameMod<=1.) fOverlapFlagClustersLay[0][iiC1]=kTRUE; | |
810 | ||
811 | // if (distClSameMod<=1.) { | |
812 | // if (distClSameModMin==0. || distClSameMod<distClSameModMin) { | |
813 | // distClSameModMin=distClSameMod; | |
814 | // iClOverlap=iiC1; | |
815 | // } | |
816 | // } | |
817 | ||
818 | ||
819 | } // end adjacent modules | |
820 | } | |
821 | } // end Loop on inner layer clusters | |
822 | ||
823 | // if (distClSameModMin!=0.) fOverlapFlagClustersLay[0][iClOverlap]=kTRUE; | |
824 | ||
825 | distClSameMod=0.; | |
826 | distClSameModMin=0.; | |
827 | iClOverlap =0; | |
828 | // Loop on outer layer clusters | |
829 | for (Int_t iiC2=0; iiC2<fNClustersLay[1]; iiC2++) { | |
830 | if (!fOverlapFlagClustersLay[1][iiC2]) { | |
831 | // only for adjacent modules | |
832 | Float_t *clPar2 = GetClusterLayer2(iiC2); | |
833 | if ((TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==4) || | |
834 | (TMath::Abs(fDetectorIndexClustersLay[1][iC2WithBestDist]-fDetectorIndexClustersLay[1][iiC2])==156)) { | |
835 | Float_t dePhi=TMath::Abs(clPar2[kClPh]-clPar2B[kClPh]); | |
836 | if (dePhi>TMath::Pi()) dePhi=2.*TMath::Pi()-dePhi; | |
837 | ||
838 | zproj1=meanRadiusLay2/TMath::Tan(clPar2B[kClTh]); | |
839 | zproj2=meanRadiusLay2/TMath::Tan(clPar2[kClTh]); | |
840 | ||
841 | deZproj=TMath::Abs(zproj1-zproj2); | |
842 | distClSameMod = TMath::Sqrt(TMath::Power(deZproj/fZetaOverlapCut,2)+TMath::Power(dePhi/fPhiOverlapCut,2)); | |
843 | if (distClSameMod<=1.) fOverlapFlagClustersLay[1][iiC2]=kTRUE; | |
844 | ||
845 | // if (distClSameMod<=1.) { | |
846 | // if (distClSameModMin==0. || distClSameMod<distClSameModMin) { | |
847 | // distClSameModMin=distClSameMod; | |
848 | // iClOverlap=iiC2; | |
849 | // } | |
850 | // } | |
851 | ||
852 | } // end adjacent modules | |
853 | } | |
854 | } // end Loop on outer layer clusters | |
855 | ||
856 | // if (distClSameModMin!=0.) fOverlapFlagClustersLay[1][iClOverlap]=kTRUE; | |
857 | ||
858 | } | |
859 | ||
860 | //____________________________________________________________________ | |
861 | void AliITSMultReconstructor::InitAux() | |
862 | { | |
863 | // init arrays/parameters for tracklet reconstruction | |
864 | ||
865 | // dPhi shift is field dependent, get average magnetic field | |
866 | Float_t bz = 0; | |
867 | AliMagF* field = 0; | |
868 | if (TGeoGlobalMagField::Instance()) field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField()); | |
869 | if (!field) { | |
870 | AliError("Could not retrieve magnetic field. Assuming no field. Delta Phi shift will be deactivated in AliITSMultReconstructor."); | |
871 | } | |
872 | else bz = TMath::Abs(field->SolenoidField()); | |
873 | fDPhiShift = fPhiShift / 5 * bz; | |
874 | AliDebug(1, Form("Using phi shift of %f", fDPhiShift)); | |
875 | // | |
876 | if (fPartners) delete[] fPartners; fPartners = new Int_t[fNClustersLay[1]]; | |
877 | if (fMinDists) delete[] fMinDists; fMinDists = new Float_t[fNClustersLay[1]]; | |
878 | if (fAssociatedLay1) delete[] fAssociatedLay1; fAssociatedLay1 = new Int_t[fNClustersLay[0]]; | |
879 | // | |
880 | if (fBlackList) delete fBlackList; fBlackList = new AliRefArray(fNClustersLay[0]); | |
881 | // | |
882 | // Printf("Vertex in find tracklets...%f %f %f",vtx[0],vtx[1],vtx[2]); | |
883 | for (Int_t i=0; i<fNClustersLay[1]; i++) { | |
884 | fPartners[i] = -1; | |
885 | fMinDists[i] = 2*fNStdDev; | |
886 | } | |
887 | memset(fAssociatedLay1,0,fNClustersLay[0]*sizeof(Int_t)); | |
888 | // | |
889 | } | |
890 | ||
891 | //____________________________________________________________________ | |
892 | void AliITSMultReconstructor::ClusterPos2Angles(const Float_t *vtx) | |
893 | { | |
894 | // convert cluster coordinates to angles wrt vertex | |
895 | for (int ilr=0;ilr<2;ilr++) { | |
896 | for (Int_t iC=0; iC<fNClustersLay[ilr]; iC++) { | |
897 | float* clPar = GetClusterOfLayer(ilr,iC); | |
898 | CalcThetaPhi(clPar[kClTh]-vtx[0],clPar[kClPh]-vtx[1],clPar[kClZ]-vtx[2],clPar[kClTh],clPar[kClPh]); | |
899 | if (ilr==0) { | |
900 | clPar[kClPh] = clPar[kClPh] + fPhiRotationAngle; // rotation of inner layer for comb studies | |
901 | if (fHistOn) { | |
902 | Float_t eta = clPar[kClTh]; | |
903 | eta= TMath::Tan(eta/2.); | |
904 | eta=-TMath::Log(eta); | |
905 | fhetaClustersLay1->Fill(eta); | |
906 | fhphiClustersLay1->Fill(clPar[kClPh]); | |
907 | } | |
908 | } | |
909 | } | |
910 | } | |
911 | // | |
912 | } | |
913 | ||
914 | //____________________________________________________________________ | |
915 | Int_t AliITSMultReconstructor::AssociateClusterOfL1(Int_t iC1) | |
916 | { | |
917 | // search association of cluster iC1 of L1 with all clusters of L2 | |
918 | if (fAssociatedLay1[iC1] != 0) return 0; | |
919 | Int_t iC2WithBestDist = -1; // reset | |
920 | Double_t minDist = 2*fNStdDev; // reset | |
921 | float* clPar1 = GetClusterLayer1(iC1); | |
922 | for (Int_t iC2=0; iC2<fNClustersLay[1]; iC2++) { | |
923 | // | |
924 | if (fBlackList->IsReferred(iC1,iC2)) continue; | |
925 | float* clPar2 = GetClusterLayer2(iC2); | |
926 | // | |
927 | // find the difference in angles | |
928 | Double_t dTheta = TMath::Abs(clPar2[kClTh] - clPar1[kClTh]); | |
929 | Double_t dPhi = TMath::Abs(clPar2[kClPh] - clPar1[kClPh]); | |
930 | // Printf("detheta %f dephi %f", dTheta,dPhi); | |
931 | // | |
932 | if (dPhi>TMath::Pi()) dPhi=2.*TMath::Pi()-dPhi; // take into account boundary condition | |
933 | // | |
934 | if (fHistOn) { | |
935 | fhClustersDPhiAll->Fill(dPhi); | |
936 | fhClustersDThetaAll->Fill(dTheta); | |
937 | fhDPhiVsDThetaAll->Fill(dTheta, dPhi); | |
938 | } | |
939 | Float_t d = CalcDist(dPhi,dTheta,clPar1[kClTh]); // make "elliptical" cut in Phi and Theta! | |
940 | // look for the minimum distance: the minimum is in iC2WithBestDist | |
941 | if (d<fNStdDev && d<minDist) { minDist=d; iC2WithBestDist = iC2; } | |
942 | } | |
943 | // | |
944 | if (minDist<fNStdDev) { // This means that a cluster in layer 2 was found that matches with iC1 | |
945 | // | |
946 | if (fMinDists[iC2WithBestDist] > minDist) { | |
947 | Int_t oldPartner = fPartners[iC2WithBestDist]; | |
948 | fPartners[iC2WithBestDist] = iC1; | |
949 | fMinDists[iC2WithBestDist] = minDist; | |
950 | // | |
951 | fAssociatedLay1[iC1] = 1; // mark as assigned | |
952 | // | |
953 | if (oldPartner != -1) { | |
954 | // redo partner search for cluster in L0 (oldPartner), putting this one (iC2WithBestDist) on its fBlackList | |
955 | fBlackList->AddReference(oldPartner,iC2WithBestDist); | |
956 | fAssociatedLay1[oldPartner] = 0; // mark as free | |
957 | } | |
958 | } else { | |
959 | // try again to find a cluster without considering iC2WithBestDist | |
960 | fBlackList->AddReference(iC1,iC2WithBestDist); | |
961 | } | |
962 | // | |
963 | } | |
964 | else fAssociatedLay1[iC1] = 2;// cluster has no partner; remove | |
965 | // | |
966 | return 1; | |
967 | } | |
968 | ||
969 | //____________________________________________________________________ | |
970 | Int_t AliITSMultReconstructor::StoreTrackletForL2Cluster(Int_t iC2) | |
971 | { | |
972 | // build tracklet for cluster iC2 of layer 2 | |
973 | if (fPartners[iC2] == -1) return 0; | |
974 | if (fRemoveClustersFromOverlaps) FlagClustersInOverlapRegions (fPartners[iC2],iC2); | |
975 | // Printf("saving tracklets"); | |
976 | if (fOverlapFlagClustersLay[0][fPartners[iC2]] || fOverlapFlagClustersLay[1][iC2]) return 0; | |
977 | float* clPar2 = GetClusterLayer2(iC2); | |
978 | float* clPar1 = GetClusterLayer1(fPartners[iC2]); | |
979 | // | |
980 | Float_t* tracklet = fTracklets[fNTracklets] = new Float_t[kTrNPar]; // RS Add also the cluster id's | |
981 | // | |
982 | tracklet[kTrTheta] = clPar1[kClTh]; // use the theta from the clusters in the first layer | |
983 | tracklet[kTrPhi] = clPar1[kClPh]; // use the phi from the clusters in the first layer | |
984 | tracklet[kTrDPhi] = clPar1[kClPh] - clPar2[kClPh]; // store the difference between phi1 and phi2 | |
985 | // | |
986 | // define dphi in the range [0,pi] with proper sign (track charge correlated) | |
987 | if (tracklet[kTrDPhi] > TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]-2.*TMath::Pi(); | |
988 | if (tracklet[kTrDPhi] < -TMath::Pi()) tracklet[kTrDPhi] = tracklet[kTrDPhi]+2.*TMath::Pi(); | |
989 | // | |
990 | tracklet[kTrDTheta] = clPar1[kClTh] - clPar2[kClTh]; // store the theta1-theta2 | |
991 | // | |
992 | if (fHistOn) { | |
993 | fhClustersDPhiAcc->Fill(tracklet[kTrDPhi]); | |
994 | fhClustersDThetaAcc->Fill(tracklet[kTrDTheta]); | |
995 | fhDPhiVsDThetaAcc->Fill(tracklet[kTrDTheta],tracklet[kTrDPhi]); | |
996 | } | |
997 | // | |
998 | // find label | |
999 | // if equal label in both clusters found this label is assigned | |
1000 | // if no equal label can be found the first labels of the L1 AND L2 cluster are assigned | |
1001 | Int_t label1=0,label2=0; | |
1002 | while (label2 < 3) { | |
1003 | if ( int(clPar1[kClMC0+label1])!=-2 && int(clPar1[kClMC0+label1])==int(clPar2[kClMC0+label2])) break; | |
1004 | if (++label1 == 3) { label1 = 0; label2++; } | |
1005 | } | |
1006 | if (label2 < 3) { | |
1007 | AliDebug(AliLog::kDebug, Form("Found label %d == %d for tracklet candidate %d\n", | |
1008 | (Int_t) clPar1[kClMC0+label1], (Int_t) clPar1[kClMC0+label2], fNTracklets)); | |
1009 | tracklet[kTrLab1] = tracklet[kTrLab2] = clPar1[kClMC0+label1]; | |
1010 | } else { | |
1011 | AliDebug(AliLog::kDebug, Form("Did not find label %d %d %d %d %d %d for tracklet candidate %d\n", | |
1012 | (Int_t) clPar1[kClMC0], (Int_t) clPar1[kClMC1], (Int_t) clPar1[kClMC2], | |
1013 | (Int_t) clPar2[kClMC0], (Int_t) clPar2[kClMC1], (Int_t) clPar2[kClMC2], fNTracklets)); | |
1014 | tracklet[kTrLab1] = clPar1[kClMC0]; | |
1015 | tracklet[kTrLab2] = clPar2[kClMC0]; | |
1016 | } | |
1017 | // | |
1018 | if (fHistOn) { | |
1019 | Float_t eta = tracklet[kTrTheta]; | |
1020 | eta= TMath::Tan(eta/2.); | |
1021 | eta=-TMath::Log(eta); | |
1022 | fhetaTracklets->Fill(eta); | |
1023 | fhphiTracklets->Fill(tracklet[kTrPhi]); | |
1024 | } | |
1025 | // | |
1026 | tracklet[kClID1] = fPartners[iC2]; | |
1027 | tracklet[kClID2] = iC2; | |
1028 | // | |
1029 | // Printf("Adding tracklet candidate"); | |
1030 | AliDebug(1,Form(" Adding tracklet candidate %d ", fNTracklets)); | |
1031 | AliDebug(1,Form(" Cl. %d of Layer 1 and %d of Layer 2", fPartners[iC2], iC2)); | |
1032 | fNTracklets++; | |
1033 | fAssociatedLay1[fPartners[iC2]] = 1; | |
1034 | // | |
1035 | return 1; | |
1036 | } | |
1037 | ||
1038 | //____________________________________________________________________ | |
1039 | void AliITSMultReconstructor::StoreL1Singles() | |
1040 | { | |
1041 | // Printf("saving single clusters..."); | |
1042 | for (Int_t iC1=0; iC1<fNClustersLay[0]; iC1++) { | |
1043 | float* clPar1 = GetClusterLayer1(iC1); | |
1044 | if (fAssociatedLay1[iC1]==2||fAssociatedLay1[iC1]==0) { | |
1045 | fSClusters[fNSingleCluster] = new Float_t[kClNPar]; | |
1046 | fSClusters[fNSingleCluster][kSCTh] = clPar1[kClTh]; | |
1047 | fSClusters[fNSingleCluster][kSCPh] = clPar1[kClPh]; | |
1048 | fSClusters[fNSingleCluster][kSCLab] = clPar1[kClMC0]; | |
1049 | fSClusters[fNSingleCluster][kSCID] = iC1; | |
1050 | AliDebug(1,Form(" Adding a single cluster %d (cluster %d of layer 1)", | |
1051 | fNSingleCluster, iC1)); | |
1052 | fNSingleCluster++; | |
1053 | } | |
1054 | } | |
1055 | // | |
1056 | } | |
1057 | ||
1058 | //____________________________________________________________________ | |
1059 | void AliITSMultReconstructor::ProcessESDTracks() | |
1060 | { | |
1061 | // Flag the clusters used by ESD tracks | |
1062 | // Flag primary tracks to be used for multiplicity counting | |
1063 | // | |
1064 | if (!fESDEvent) return; | |
1065 | AliESDVertex* vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexTracks(); | |
1066 | if (!vtx || vtx->GetNContributors()<1) vtx = (AliESDVertex*)fESDEvent->GetPrimaryVertexSPD(); | |
1067 | if (!vtx || vtx->GetNContributors()<1) { | |
1068 | AliDebug(1,"No primary vertex: cannot flag primary tracks"); | |
1069 | return; | |
1070 | } | |
1071 | Int_t ntracks = fESDEvent->GetNumberOfTracks(); | |
1072 | for(Int_t itr=0; itr<ntracks; itr++) { | |
1073 | AliESDtrack* track = fESDEvent->GetTrack(itr); | |
1074 | if (!track->IsOn(AliESDtrack::kITSin)) continue; // use only tracks propagated in ITS to vtx | |
1075 | FlagTrackClusters(itr); | |
1076 | FlagIfSecondary(track,vtx); | |
1077 | } | |
1078 | FlagV0s(vtx); | |
1079 | // | |
1080 | } | |
1081 | ||
1082 | //____________________________________________________________________ | |
1083 | void AliITSMultReconstructor::FlagTrackClusters(Int_t id) | |
1084 | { | |
1085 | // RS: flag the SPD clusters of the track if it is useful for the multiplicity estimation | |
1086 | // | |
1087 | const AliESDtrack* track = fESDEvent->GetTrack(id); | |
1088 | Int_t idx[12]; | |
1089 | if ( track->GetITSclusters(idx)<3 ) return; // at least 3 clusters must be used in the fit | |
1090 | Int_t itsType = track->IsOn(AliESDtrack::kITSpureSA) ? 1:0; | |
1091 | ||
1092 | for (int i=6/*AliESDfriendTrack::kMaxITScluster*/;i--;) { // ignore extras: note: i>=6 is for extra clusters | |
1093 | if (idx[i]<0) continue; | |
1094 | int layID= (idx[i] & 0xf0000000) >> 28; | |
1095 | if (layID>1) continue; // SPD only | |
1096 | int clID = (idx[i] & 0x0fffffff); | |
1097 | fUsedClusLay[layID][itsType]->AddReference(clID,id); | |
1098 | fStoreRefs[layID][itsType] = kTRUE; | |
1099 | } | |
1100 | // | |
1101 | } | |
1102 | ||
1103 | //____________________________________________________________________ | |
1104 | void AliITSMultReconstructor::FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx) | |
1105 | { | |
1106 | // RS: check if the track is primary and set the flag | |
1107 | double cut = (track->HasPointOnITSLayer(0)||track->HasPointOnITSLayer(1)) ? fCutPxDrSPDin:fCutPxDrSPDout; | |
1108 | float xz[2]; | |
1109 | track->GetDZ(vtx->GetX(),vtx->GetY(),vtx->GetZ(), fESDEvent->GetMagneticField(), xz); | |
1110 | if (TMath::Abs(xz[0]*track->P())>cut || TMath::Abs(xz[1]*track->P())>fCutPxDz || | |
1111 | TMath::Abs(xz[0])>fCutDCArz || TMath::Abs(xz[1])>fCutDCArz) | |
1112 | track->SetStatus(AliESDtrack::kMultSec); | |
1113 | else track->ResetStatus(AliESDtrack::kMultSec); | |
1114 | } | |
1115 | ||
1116 | //____________________________________________________________________ | |
1117 | void AliITSMultReconstructor::FlagV0s(const AliESDVertex *vtx) | |
1118 | { | |
1119 | // flag tracks belonging to v0s | |
1120 | // | |
1121 | const double kK0Mass = 0.4976; | |
1122 | // | |
1123 | AliV0 pvertex; | |
1124 | AliKFVertex vertexKF; | |
1125 | AliKFParticle epKF0,epKF1,pipmKF0,piKF0,piKF1,gammaKF,k0KF; | |
1126 | Double_t mass,massErr,chi2c; | |
1127 | enum {kKFIni=BIT(14)}; | |
1128 | // | |
1129 | double recVtx[3]; | |
1130 | float recVtxF[3]; | |
1131 | vtx->GetXYZ(recVtx); | |
1132 | for (int i=3;i--;) recVtxF[i] = recVtx[i]; | |
1133 | // | |
1134 | int ntracks = fESDEvent->GetNumberOfTracks(); | |
1135 | if (ntracks<2) return; | |
1136 | // | |
1137 | vertexKF.X() = recVtx[0]; | |
1138 | vertexKF.Y() = recVtx[1]; | |
1139 | vertexKF.Z() = recVtx[2]; | |
1140 | vertexKF.Covariance(0,0) = vtx->GetXRes()*vtx->GetXRes(); | |
1141 | vertexKF.Covariance(1,2) = vtx->GetYRes()*vtx->GetYRes(); | |
1142 | vertexKF.Covariance(2,2) = vtx->GetZRes()*vtx->GetZRes(); | |
1143 | // | |
1144 | AliESDtrack *trc0,*trc1; | |
1145 | for (int it0=0;it0<ntracks;it0++) { | |
1146 | trc0 = fESDEvent->GetTrack(it0); | |
1147 | if (trc0->IsOn(AliESDtrack::kMultInV0)) continue; | |
1148 | if (!trc0->IsOn(AliESDtrack::kITSin)) continue; | |
1149 | Bool_t isSAP = trc0->IsPureITSStandalone(); | |
1150 | Int_t q0 = trc0->Charge(); | |
1151 | Bool_t testGamma = CanBeElectron(trc0); | |
1152 | epKF0.ResetBit(kKFIni); | |
1153 | piKF0.ResetBit(kKFIni); | |
1154 | double bestChi2=1e16; | |
1155 | int bestID = -1; | |
1156 | // | |
1157 | for (int it1=it0+1;it1<ntracks;it1++) { | |
1158 | trc1 = fESDEvent->GetTrack(it1); | |
1159 | if (trc1->IsOn(AliESDtrack::kMultInV0)) continue; | |
1160 | if (!trc1->IsOn(AliESDtrack::kITSin)) continue; | |
1161 | if (trc1->IsPureITSStandalone() != isSAP) continue; // pair separately ITS_SA_Pure tracks and TPC/ITS+ITS_SA | |
1162 | if ( (q0+trc1->Charge())!=0 ) continue; // don't pair like signs | |
1163 | // | |
1164 | pvertex.SetParamN(q0<0 ? *trc0:*trc1); | |
1165 | pvertex.SetParamP(q0>0 ? *trc0:*trc1); | |
1166 | pvertex.Update(recVtxF); | |
1167 | if (pvertex.P()<fCutMinP) continue; | |
1168 | if (pvertex.GetV0CosineOfPointingAngle()<fCutMinPointAngle) continue; | |
1169 | if (pvertex.GetDcaV0Daughters()>fCutMaxDCADauther) continue; | |
1170 | double d = pvertex.GetD(recVtx[0],recVtx[1],recVtx[2]); | |
1171 | if (d>fCutMaxDCA) continue; | |
1172 | double dx=recVtx[0]-pvertex.Xv(), dy=recVtx[1]-pvertex.Yv(); | |
1173 | double rv = TMath::Sqrt(dx*dx+dy*dy); | |
1174 | // | |
1175 | // check gamma conversion hypothesis ----------------------------------------------------------->>> | |
1176 | Bool_t gammaOK = kFALSE; | |
1177 | while (testGamma && CanBeElectron(trc1)) { | |
1178 | if (rv<fCutMinRGamma) break; | |
1179 | if (!epKF0.TestBit(kKFIni)) { | |
1180 | new(&epKF0) AliKFParticle(*trc0,q0>0 ? kPositron:kElectron); | |
1181 | epKF0.SetBit(kKFIni); | |
1182 | } | |
1183 | new(&epKF1) AliKFParticle(*trc1,q0<0 ? kPositron:kElectron); | |
1184 | gammaKF.Initialize(); | |
1185 | gammaKF += epKF0; | |
1186 | gammaKF += epKF1; | |
1187 | gammaKF.SetProductionVertex(vertexKF); | |
1188 | gammaKF.GetMass(mass,massErr); | |
1189 | if (mass>fCutMassGamma || (massErr>0&&(mass>massErr*fCutMassGammaNSigma))) break; | |
1190 | if (gammaKF.GetS()<fCutGammaSFromDecay) break; | |
1191 | gammaKF.SetMassConstraint(0.,0.001); | |
1192 | chi2c = (gammaKF.GetNDF()!=0) ? gammaKF.GetChi2()/gammaKF.GetNDF() : 1000; | |
1193 | if (chi2c>fCutChi2cGamma) break; | |
1194 | gammaOK = kTRUE; | |
1195 | if (chi2c>bestChi2) break; | |
1196 | bestChi2 = chi2c; | |
1197 | bestID = it1; | |
1198 | break; | |
1199 | } | |
1200 | if (gammaOK) continue; | |
1201 | // check gamma conversion hypothesis -----------------------------------------------------------<<< | |
1202 | // check K0 conversion hypothesis ----------------------------------------------------------->>> | |
1203 | while (1) { | |
1204 | if (rv<fCutMinRK0) break; | |
1205 | if (!piKF0.TestBit(kKFIni)) { | |
1206 | new(&piKF0) AliKFParticle(*trc0,q0>0 ? kPiPlus:kPiMinus); | |
1207 | piKF0.SetBit(kKFIni); | |
1208 | } | |
1209 | new(&piKF1) AliKFParticle(*trc1,q0<0 ? kPiPlus:kPiMinus); | |
1210 | k0KF.Initialize(); | |
1211 | k0KF += piKF0; | |
1212 | k0KF += piKF1; | |
1213 | k0KF.SetProductionVertex(vertexKF); | |
1214 | k0KF.GetMass(mass,massErr); | |
1215 | mass -= kK0Mass; | |
1216 | if (TMath::Abs(mass)>fCutMassK0 || (massErr>0&&(abs(mass)>massErr*fCutMassK0NSigma))) break; | |
1217 | if (k0KF.GetS()<fCutK0SFromDecay) break; | |
1218 | k0KF.SetMassConstraint(kK0Mass,0.001); | |
1219 | chi2c = (k0KF.GetNDF()!=0) ? k0KF.GetChi2()/k0KF.GetNDF() : 1000; | |
1220 | if (chi2c>fCutChi2cK0) break; | |
1221 | if (chi2c>bestChi2) break; | |
1222 | bestChi2 = chi2c; | |
1223 | bestID = it1; | |
1224 | break; | |
1225 | } | |
1226 | // check K0 conversion hypothesis -----------------------------------------------------------<<< | |
1227 | } | |
1228 | // | |
1229 | if (bestID>=0) { | |
1230 | trc0->SetStatus(AliESDtrack::kMultInV0); | |
1231 | fESDEvent->GetTrack(bestID)->SetStatus(AliESDtrack::kMultInV0); | |
1232 | } | |
1233 | } | |
1234 | // | |
1235 | } | |
1236 | ||
1237 | //____________________________________________________________________ | |
1238 | Bool_t AliITSMultReconstructor::CanBeElectron(const AliESDtrack* trc) const | |
1239 | { | |
1240 | // check if the track can be electron | |
1241 | Double_t pid[AliPID::kSPECIES]; | |
1242 | if (!trc->IsOn(AliESDtrack::kESDpid)) return kTRUE; | |
1243 | trc->GetESDpid(pid); | |
1244 | return (trc->IsOn(AliESDtrack::kTPCpid)) ? | |
1245 | pid[AliPID::kElectron]>fCutMinElectronProbTPC : | |
1246 | pid[AliPID::kElectron]>fCutMinElectronProbESD; | |
1247 | // | |
1248 | } |