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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 | /* $Id$ */ | |
17 | ||
18 | //----------------------------------------------------------------------------- | |
19 | // Class AliMUONTrack | |
20 | //------------------- | |
21 | // Reconstructed track in ALICE dimuon spectrometer | |
22 | //----------------------------------------------------------------------------- | |
23 | ||
24 | #include "AliMUONTrack.h" | |
25 | ||
26 | #include "AliMUONReconstructor.h" | |
27 | #include "AliMUONVCluster.h" | |
28 | #include "AliMUONVClusterStore.h" | |
29 | #include "AliMUONObjectPair.h" | |
30 | #include "AliMUONTrackExtrap.h" | |
31 | #include "AliMUONConstants.h" | |
32 | #include "AliMUONTrackParam.h" | |
33 | ||
34 | #include "AliLog.h" | |
35 | ||
36 | #include <TMath.h> | |
37 | ||
38 | #include <Riostream.h> | |
39 | ||
40 | /// \cond CLASSIMP | |
41 | ClassImp(AliMUONTrack) // Class implementation in ROOT context | |
42 | /// \endcond | |
43 | ||
44 | ||
45 | const Double_t AliMUONTrack::fgkMaxChi2 = 1.e10; ///< maximum chi2 above which the track can be considered as abnormal | |
46 | ||
47 | ||
48 | //__________________________________________________________________________ | |
49 | AliMUONTrack::AliMUONTrack() | |
50 | : TObject(), | |
51 | fTrackParamAtCluster(0x0), | |
52 | fFitWithVertex(kFALSE), | |
53 | fVertexErrXY2(), | |
54 | fFitWithMCS(kFALSE), | |
55 | fClusterWeightsNonBending(0x0), | |
56 | fClusterWeightsBending(0x0), | |
57 | fGlobalChi2(-1.), | |
58 | fImproved(kFALSE), | |
59 | fMatchTrigger(-1), | |
60 | fChi2MatchTrigger(0.), | |
61 | fTrackID(-1), | |
62 | fTrackParamAtVertex(0x0), | |
63 | fHitsPatternInTrigCh(0), | |
64 | fLocalTrigger(0), | |
65 | fConnected(kFALSE) | |
66 | { | |
67 | /// Default constructor | |
68 | fVertexErrXY2[0] = 0.; | |
69 | fVertexErrXY2[1] = 0.; | |
70 | } | |
71 | ||
72 | //__________________________________________________________________________ | |
73 | AliMUONTrack::AliMUONTrack(AliMUONObjectPair *segment, Double_t bendingVertexDispersion) | |
74 | : TObject(), | |
75 | fTrackParamAtCluster(new TObjArray(20)), | |
76 | fFitWithVertex(kFALSE), | |
77 | fVertexErrXY2(), | |
78 | fFitWithMCS(kFALSE), | |
79 | fClusterWeightsNonBending(0x0), | |
80 | fClusterWeightsBending(0x0), | |
81 | fGlobalChi2(0.), | |
82 | fImproved(kFALSE), | |
83 | fMatchTrigger(-1), | |
84 | fChi2MatchTrigger(0.), | |
85 | fTrackID(-1), | |
86 | fTrackParamAtVertex(0x0), | |
87 | fHitsPatternInTrigCh(0), | |
88 | fLocalTrigger(0), | |
89 | fConnected(kFALSE) | |
90 | { | |
91 | /// Constructor from two clusters | |
92 | ||
93 | fTrackParamAtCluster->SetOwner(kTRUE); | |
94 | ||
95 | fVertexErrXY2[0] = 0.; | |
96 | fVertexErrXY2[1] = 0.; | |
97 | ||
98 | // Pointers to clusters from the segment | |
99 | AliMUONVCluster* firstCluster = (AliMUONVCluster*) segment->First(); | |
100 | AliMUONVCluster* lastCluster = (AliMUONVCluster*) segment->Second(); | |
101 | ||
102 | // Compute track parameters | |
103 | Double_t z1 = firstCluster->GetZ(); | |
104 | Double_t z2 = lastCluster->GetZ(); | |
105 | Double_t dZ = z1 - z2; | |
106 | // Non bending plane | |
107 | Double_t nonBendingCoor1 = firstCluster->GetX(); | |
108 | Double_t nonBendingCoor2 = lastCluster->GetX(); | |
109 | Double_t nonBendingSlope = (nonBendingCoor1 - nonBendingCoor2) / dZ; | |
110 | // Bending plane | |
111 | Double_t bendingCoor1 = firstCluster->GetY(); | |
112 | Double_t bendingCoor2 = lastCluster->GetY(); | |
113 | Double_t bendingSlope = (bendingCoor1 - bendingCoor2) / dZ; | |
114 | // Inverse bending momentum | |
115 | Double_t bendingImpact = bendingCoor1 - z1 * bendingSlope; | |
116 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); | |
117 | ||
118 | // Set track parameters at first cluster | |
119 | AliMUONTrackParam trackParamAtFirstCluster; | |
120 | trackParamAtFirstCluster.SetZ(z1); | |
121 | trackParamAtFirstCluster.SetNonBendingCoor(nonBendingCoor1); | |
122 | trackParamAtFirstCluster.SetNonBendingSlope(nonBendingSlope); | |
123 | trackParamAtFirstCluster.SetBendingCoor(bendingCoor1); | |
124 | trackParamAtFirstCluster.SetBendingSlope(bendingSlope); | |
125 | trackParamAtFirstCluster.SetInverseBendingMomentum(inverseBendingMomentum); | |
126 | ||
127 | // Set track parameters at last cluster | |
128 | AliMUONTrackParam trackParamAtLastCluster; | |
129 | trackParamAtLastCluster.SetZ(z2); | |
130 | trackParamAtLastCluster.SetNonBendingCoor(nonBendingCoor2); | |
131 | trackParamAtLastCluster.SetNonBendingSlope(nonBendingSlope); | |
132 | trackParamAtLastCluster.SetBendingCoor(bendingCoor2); | |
133 | trackParamAtLastCluster.SetBendingSlope(bendingSlope); | |
134 | trackParamAtLastCluster.SetInverseBendingMomentum(inverseBendingMomentum); | |
135 | ||
136 | // Compute and set track parameters covariances at first cluster | |
137 | TMatrixD paramCov(5,5); | |
138 | paramCov.Zero(); | |
139 | // Non bending plane | |
140 | paramCov(0,0) = firstCluster->GetErrX2(); | |
141 | paramCov(0,1) = firstCluster->GetErrX2() / dZ; | |
142 | paramCov(1,0) = paramCov(0,1); | |
143 | paramCov(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ; | |
144 | // Bending plane | |
145 | paramCov(2,2) = firstCluster->GetErrY2(); | |
146 | paramCov(2,3) = firstCluster->GetErrY2() / dZ; | |
147 | paramCov(3,2) = paramCov(2,3); | |
148 | paramCov(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ; | |
149 | // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field) | |
150 | if (AliMUONTrackExtrap::IsFieldON()) { | |
151 | paramCov(4,4) = ( ( bendingVertexDispersion*bendingVertexDispersion + | |
152 | (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) / | |
153 | bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum ; | |
154 | paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; | |
155 | paramCov(4,2) = paramCov(2,4); | |
156 | paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ; | |
157 | paramCov(4,3) = paramCov(3,4); | |
158 | } else paramCov(4,4) = inverseBendingMomentum*inverseBendingMomentum; | |
159 | trackParamAtFirstCluster.SetCovariances(paramCov); | |
160 | ||
161 | // Compute and set track parameters covariances at last cluster | |
162 | // Non bending plane | |
163 | paramCov(0,0) = lastCluster->GetErrX2(); | |
164 | paramCov(0,1) = - lastCluster->GetErrX2() / dZ; | |
165 | paramCov(1,0) = paramCov(0,1); | |
166 | // Bending plane | |
167 | paramCov(2,2) = lastCluster->GetErrY2(); | |
168 | paramCov(2,3) = - lastCluster->GetErrY2() / dZ; | |
169 | paramCov(3,2) = paramCov(2,3); | |
170 | // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field) | |
171 | if (AliMUONTrackExtrap::IsFieldON()) { | |
172 | paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; | |
173 | paramCov(4,2) = paramCov(2,4); | |
174 | } | |
175 | trackParamAtLastCluster.SetCovariances(paramCov); | |
176 | ||
177 | // Add track parameters at clusters | |
178 | AddTrackParamAtCluster(trackParamAtFirstCluster,*firstCluster); | |
179 | AddTrackParamAtCluster(trackParamAtLastCluster,*lastCluster); | |
180 | ||
181 | } | |
182 | ||
183 | //__________________________________________________________________________ | |
184 | AliMUONTrack::AliMUONTrack(const AliMUONTrack& track) | |
185 | : TObject(track), | |
186 | fTrackParamAtCluster(0x0), | |
187 | fFitWithVertex(track.fFitWithVertex), | |
188 | fVertexErrXY2(), | |
189 | fFitWithMCS(track.fFitWithMCS), | |
190 | fClusterWeightsNonBending(0x0), | |
191 | fClusterWeightsBending(0x0), | |
192 | fGlobalChi2(track.fGlobalChi2), | |
193 | fImproved(track.fImproved), | |
194 | fMatchTrigger(track.fMatchTrigger), | |
195 | fChi2MatchTrigger(track.fChi2MatchTrigger), | |
196 | fTrackID(track.fTrackID), | |
197 | fTrackParamAtVertex(0x0), | |
198 | fHitsPatternInTrigCh(track.fHitsPatternInTrigCh), | |
199 | fLocalTrigger(track.fLocalTrigger), | |
200 | fConnected(track.fConnected) | |
201 | { | |
202 | ///copy constructor | |
203 | ||
204 | // necessary to make a copy of the objects and not only the pointers in TObjArray. | |
205 | if (track.fTrackParamAtCluster) { | |
206 | fTrackParamAtCluster = new TObjArray(track.fTrackParamAtCluster->GetSize()); | |
207 | fTrackParamAtCluster->SetOwner(kTRUE); | |
208 | for (Int_t i = 0; i < track.GetNClusters(); i++) | |
209 | fTrackParamAtCluster->AddLast(new AliMUONTrackParam(*static_cast<AliMUONTrackParam*>(track.fTrackParamAtCluster->UncheckedAt(i)))); | |
210 | } | |
211 | ||
212 | // copy vertex resolution square used during the tracking procedure | |
213 | fVertexErrXY2[0] = track.fVertexErrXY2[0]; | |
214 | fVertexErrXY2[1] = track.fVertexErrXY2[1]; | |
215 | ||
216 | // copy cluster weights matrices if any | |
217 | if (track.fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending)); | |
218 | if (track.fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending)); | |
219 | ||
220 | // copy track parameters at vertex if any | |
221 | if (track.fTrackParamAtVertex) fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex)); | |
222 | ||
223 | } | |
224 | ||
225 | //__________________________________________________________________________ | |
226 | AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& track) | |
227 | { | |
228 | /// Asignment operator | |
229 | // check assignement to self | |
230 | if (this == &track) | |
231 | return *this; | |
232 | ||
233 | // base class assignement | |
234 | TObject::operator=(track); | |
235 | ||
236 | // clear memory | |
237 | Clear(); | |
238 | ||
239 | // necessary to make a copy of the objects and not only the pointers in TObjArray | |
240 | if (track.fTrackParamAtCluster) { | |
241 | fTrackParamAtCluster = new TObjArray(track.fTrackParamAtCluster->GetSize()); | |
242 | fTrackParamAtCluster->SetOwner(kTRUE); | |
243 | for (Int_t i = 0; i < track.GetNClusters(); i++) | |
244 | fTrackParamAtCluster->AddLast(new AliMUONTrackParam(*static_cast<AliMUONTrackParam*>(track.fTrackParamAtCluster->UncheckedAt(i)))); | |
245 | } | |
246 | ||
247 | // copy cluster weights matrix if any | |
248 | if (track.fClusterWeightsNonBending) { | |
249 | if (fClusterWeightsNonBending) { | |
250 | fClusterWeightsNonBending->ResizeTo(*(track.fClusterWeightsNonBending)); | |
251 | *fClusterWeightsNonBending = *(track.fClusterWeightsNonBending); | |
252 | } else fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending)); | |
253 | } | |
254 | ||
255 | // copy cluster weights matrix if any | |
256 | if (track.fClusterWeightsBending) { | |
257 | if (fClusterWeightsBending) { | |
258 | fClusterWeightsBending->ResizeTo(*(track.fClusterWeightsBending)); | |
259 | *fClusterWeightsBending = *(track.fClusterWeightsBending); | |
260 | } else fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending)); | |
261 | } | |
262 | ||
263 | // copy track parameters at vertex if any | |
264 | if (track.fTrackParamAtVertex) { | |
265 | if (fTrackParamAtVertex) *fTrackParamAtVertex = *(track.fTrackParamAtVertex); | |
266 | else fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex)); | |
267 | } | |
268 | ||
269 | fFitWithVertex = track.fFitWithVertex; | |
270 | fVertexErrXY2[0] = track.fVertexErrXY2[0]; | |
271 | fVertexErrXY2[1] = track.fVertexErrXY2[1]; | |
272 | fFitWithMCS = track.fFitWithMCS; | |
273 | fGlobalChi2 = track.fGlobalChi2; | |
274 | fImproved = track.fImproved; | |
275 | fMatchTrigger = track.fMatchTrigger; | |
276 | fChi2MatchTrigger = track.fChi2MatchTrigger; | |
277 | fTrackID = track.fTrackID; | |
278 | fHitsPatternInTrigCh = track.fHitsPatternInTrigCh; | |
279 | fLocalTrigger = track.fLocalTrigger; | |
280 | fConnected = track.fConnected; | |
281 | ||
282 | return *this; | |
283 | } | |
284 | ||
285 | //__________________________________________________________________________ | |
286 | AliMUONTrack::~AliMUONTrack() | |
287 | { | |
288 | /// Destructor | |
289 | delete fTrackParamAtCluster; | |
290 | delete fClusterWeightsNonBending; | |
291 | delete fClusterWeightsBending; | |
292 | delete fTrackParamAtVertex; | |
293 | } | |
294 | ||
295 | //__________________________________________________________________________ | |
296 | void AliMUONTrack::Clear(Option_t* /*opt*/) | |
297 | { | |
298 | /// Clear arrays | |
299 | delete fTrackParamAtCluster; fTrackParamAtCluster = 0x0; | |
300 | delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0; | |
301 | delete fClusterWeightsBending; fClusterWeightsBending = 0x0; | |
302 | delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0; | |
303 | } | |
304 | ||
305 | //__________________________________________________________________________ | |
306 | void AliMUONTrack::Reset() | |
307 | { | |
308 | /// Reset to default values | |
309 | SetUniqueID(0); | |
310 | fFitWithVertex = kFALSE; | |
311 | fVertexErrXY2[0] = 0.; | |
312 | fVertexErrXY2[1] = 0.; | |
313 | fFitWithMCS = kFALSE; | |
314 | fGlobalChi2 = -1.; | |
315 | fImproved = kFALSE; | |
316 | fMatchTrigger = -1; | |
317 | fChi2MatchTrigger = 0.; | |
318 | fTrackID = -1; | |
319 | fHitsPatternInTrigCh = 0; | |
320 | fLocalTrigger = 0; | |
321 | fConnected = kFALSE; | |
322 | delete fTrackParamAtCluster; fTrackParamAtCluster = 0x0; | |
323 | delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0; | |
324 | delete fClusterWeightsBending; fClusterWeightsBending = 0x0; | |
325 | delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0; | |
326 | } | |
327 | ||
328 | //__________________________________________________________________________ | |
329 | TObjArray* AliMUONTrack::GetTrackParamAtCluster() const | |
330 | { | |
331 | /// return array of track parameters at cluster (create it if needed) | |
332 | if (!fTrackParamAtCluster) { | |
333 | fTrackParamAtCluster = new TObjArray(20); | |
334 | fTrackParamAtCluster->SetOwner(kTRUE); | |
335 | } | |
336 | return fTrackParamAtCluster; | |
337 | } | |
338 | ||
339 | //__________________________________________________________________________ | |
340 | void AliMUONTrack::AddTrackParamAtCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster &cluster, Bool_t copy) | |
341 | { | |
342 | /// Copy given track parameters into a new TrackParamAtCluster | |
343 | /// Link parameters with the associated cluster | |
344 | /// If copy=kTRUE: the cluster is copied then passed the trackParam which become its owner | |
345 | /// otherwise: make sure to do not delete the cluster until it is used by the track | |
346 | ||
347 | // check chamber ID of the associated cluster | |
348 | if (cluster.GetChamberId() < 0 || cluster.GetChamberId() > AliMUONConstants::NTrackingCh()) { | |
349 | AliError(Form("Chamber ID of the associated cluster is not valid (ChamberId=%d)",cluster.GetChamberId())); | |
350 | return; | |
351 | } | |
352 | ||
353 | // check whether track parameters are given at the correct cluster z position | |
354 | if (TMath::Abs(cluster.GetZ() - trackParam.GetZ())>1.e-5) { // AU | |
355 | AliError("track parameters are given at a different z position than the one of the associated cluster"); | |
356 | return; | |
357 | } | |
358 | ||
359 | // add parameters to the array of track parameters | |
360 | if (!fTrackParamAtCluster) { | |
361 | fTrackParamAtCluster = new TObjArray(20); | |
362 | fTrackParamAtCluster->SetOwner(kTRUE); | |
363 | } | |
364 | AliMUONTrackParam* trackParamAtCluster = new AliMUONTrackParam(trackParam); | |
365 | fTrackParamAtCluster->AddLast(trackParamAtCluster); | |
366 | ||
367 | // link parameters with the associated cluster or its copy | |
368 | if (copy) { | |
369 | AliMUONVCluster *clusterCopy = static_cast<AliMUONVCluster*>(cluster.Clone()); | |
370 | trackParamAtCluster->SetClusterPtr(clusterCopy, kTRUE); | |
371 | } else trackParamAtCluster->SetClusterPtr(&cluster); | |
372 | ||
373 | // sort the array of track parameters | |
374 | fTrackParamAtCluster->Sort(); | |
375 | } | |
376 | ||
377 | //__________________________________________________________________________ | |
378 | void AliMUONTrack::RemoveTrackParamAtCluster(AliMUONTrackParam *trackParam) | |
379 | { | |
380 | /// Remove trackParam from the array of TrackParamAtCluster and delete it since the array is owner | |
381 | ||
382 | if (fTrackParamAtCluster) { | |
383 | ||
384 | AliMUONTrackParam* trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->Remove(trackParam)); | |
385 | ||
386 | if (trackParamAtCluster) { | |
387 | ||
388 | // clean memory | |
389 | delete trackParamAtCluster; | |
390 | ||
391 | // remove hole | |
392 | fTrackParamAtCluster->Compress(); | |
393 | ||
394 | } else AliWarning("object to remove does not exist in array fTrackParamAtCluster"); | |
395 | ||
396 | } else AliWarning("array fTrackParamAtCluster does not exist"); | |
397 | ||
398 | } | |
399 | ||
400 | //__________________________________________________________________________ | |
401 | Bool_t AliMUONTrack::UpdateTrackParamAtCluster() | |
402 | { | |
403 | /// Update track parameters at each attached cluster | |
404 | /// Return kFALSE in case of failure (i.e. extrapolation problem) | |
405 | ||
406 | Int_t nClusters = GetNClusters(); | |
407 | if (nClusters == 0) { | |
408 | AliWarning("no cluster attached to the track"); | |
409 | return kFALSE; | |
410 | } | |
411 | ||
412 | Bool_t extrapStatus = kTRUE; | |
413 | AliMUONTrackParam* startingTrackParam = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(0)); | |
414 | ||
415 | for (Int_t i = 1; i < nClusters; i++) { | |
416 | AliMUONTrackParam* trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(i)); | |
417 | ||
418 | // reset track parameters and their covariances | |
419 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); | |
420 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
421 | ||
422 | // extrapolation to the given z | |
423 | if (!AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE; | |
424 | ||
425 | // prepare next step | |
426 | startingTrackParam = trackParamAtCluster; | |
427 | } | |
428 | ||
429 | // set global chi2 to max value in case of problem during track extrapolation | |
430 | if (!extrapStatus) SetGlobalChi2(2.*MaxChi2()); | |
431 | return extrapStatus; | |
432 | ||
433 | } | |
434 | ||
435 | //__________________________________________________________________________ | |
436 | Bool_t AliMUONTrack::UpdateCovTrackParamAtCluster() | |
437 | { | |
438 | /// Update track parameters and their covariances at each attached cluster | |
439 | /// Include effects of multiple scattering in chambers | |
440 | /// Return kFALSE in case of failure (i.e. extrapolation problem) | |
441 | ||
442 | Int_t nClusters = GetNClusters(); | |
443 | if (nClusters == 0) { | |
444 | AliWarning("no cluster attached to the track"); | |
445 | return kFALSE; | |
446 | } | |
447 | ||
448 | Bool_t extrapStatus = kTRUE; | |
449 | AliMUONTrackParam* startingTrackParam = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(0)); | |
450 | Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() + 1; | |
451 | Int_t currentChamber; | |
452 | ||
453 | for (Int_t i = 1; i < nClusters; i++) { | |
454 | AliMUONTrackParam* trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(i)); | |
455 | ||
456 | // reset track parameters and their covariances | |
457 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); | |
458 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
459 | trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances()); | |
460 | ||
461 | // add MCS effect | |
462 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber-1),-1.); | |
463 | ||
464 | // add MCS in missing chambers if any | |
465 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); | |
466 | while (currentChamber > expectedChamber) { | |
467 | // extrapolation to the missing chamber | |
468 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber))) extrapStatus = kFALSE; | |
469 | // add MCS effect | |
470 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.); | |
471 | expectedChamber++; | |
472 | } | |
473 | ||
474 | // extrapolation to the z of the current cluster | |
475 | if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE; | |
476 | ||
477 | // prepare next step | |
478 | expectedChamber = currentChamber + 1; | |
479 | startingTrackParam = trackParamAtCluster; | |
480 | } | |
481 | ||
482 | // set global chi2 to max value in case of problem during track extrapolation | |
483 | if (!extrapStatus) SetGlobalChi2(2.*MaxChi2()); | |
484 | return extrapStatus; | |
485 | ||
486 | } | |
487 | ||
488 | //__________________________________________________________________________ | |
489 | Bool_t AliMUONTrack::IsValid(UInt_t requestedStationMask, Bool_t request2ChInSameSt45) | |
490 | { | |
491 | /// check the validity of the current track: | |
492 | /// at least one cluster per requested station | |
493 | /// and at least 2 chambers in stations 4 & 5 that contain cluster(s) | |
494 | /// + if request2ChInSameSt45 = kTRUE: 2 chambers hit in the same station (4 or 5) | |
495 | ||
496 | Int_t nClusters = GetNClusters(); | |
497 | AliMUONTrackParam *trackParam; | |
498 | Int_t currentCh, currentSt, previousCh = -1, nChHitInSt4 = 0, nChHitInSt5 = 0; | |
499 | UInt_t presentStationMask(0); | |
500 | ||
501 | // first loop over clusters | |
502 | for (Int_t i = 0; i < nClusters; i++) { | |
503 | trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i); | |
504 | ||
505 | currentCh = trackParam->GetClusterPtr()->GetChamberId(); | |
506 | currentSt = currentCh/2; | |
507 | ||
508 | // build present station mask | |
509 | presentStationMask |= ( 1 << currentSt ); | |
510 | ||
511 | // count the number of chambers hit in station 4 that contain cluster(s) | |
512 | if (currentSt == 3 && currentCh != previousCh) { | |
513 | nChHitInSt4++; | |
514 | previousCh = currentCh; | |
515 | } | |
516 | ||
517 | // count the number of chambers hit in station 5 that contain cluster(s) | |
518 | if (currentSt == 4 && currentCh != previousCh) { | |
519 | nChHitInSt5++; | |
520 | previousCh = currentCh; | |
521 | } | |
522 | ||
523 | } | |
524 | ||
525 | // at least one cluster per requested station | |
526 | if ((requestedStationMask & presentStationMask) != requestedStationMask) return kFALSE; | |
527 | ||
528 | // 2 chambers hit in the same station (4 or 5) | |
529 | if (request2ChInSameSt45) return (nChHitInSt4 == 2 || nChHitInSt5 == 2); | |
530 | // or 2 chambers hit in station 4 & 5 together | |
531 | else return (nChHitInSt4+nChHitInSt5 >= 2); | |
532 | ||
533 | } | |
534 | ||
535 | //__________________________________________________________________________ | |
536 | void AliMUONTrack::TagRemovableClusters(UInt_t requestedStationMask) { | |
537 | /// Identify clusters that can be removed from the track, | |
538 | /// with the only requirements to have at least 1 cluster per requested station | |
539 | /// and at least 2 chambers over 4 in stations 4 & 5 that contain cluster(s) | |
540 | ||
541 | Int_t nClusters = GetNClusters(); | |
542 | AliMUONTrackParam *trackParam, *nextTrackParam; | |
543 | Int_t currentCh, nextCh, currentSt, nextSt, previousCh = -1, nChHitInSt45 = 0; | |
544 | ||
545 | // first loop over clusters | |
546 | for (Int_t i = 0; i < nClusters; i++) { | |
547 | trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i); | |
548 | ||
549 | currentCh = trackParam->GetClusterPtr()->GetChamberId(); | |
550 | currentSt = currentCh/2; | |
551 | ||
552 | // reset flags to kFALSE for all clusters in required station | |
553 | if ((1 << currentSt) & requestedStationMask) trackParam->SetRemovable(kFALSE); | |
554 | else trackParam->SetRemovable(kTRUE); | |
555 | ||
556 | // count the number of chambers in station 4 & 5 that contain cluster(s) | |
557 | if (currentCh > 5 && currentCh != previousCh) { | |
558 | nChHitInSt45++; | |
559 | previousCh = currentCh; | |
560 | } | |
561 | ||
562 | } | |
563 | ||
564 | // second loop over clusters | |
565 | for (Int_t i = 0; i < nClusters; i++) { | |
566 | trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i); | |
567 | ||
568 | currentCh = trackParam->GetClusterPtr()->GetChamberId(); | |
569 | currentSt = currentCh/2; | |
570 | ||
571 | // make sure they are more than 2 clusters in 2 different chambers of stations 4 & 5 | |
572 | // but 2 clusters in he same chamber will still be flagged as removable | |
573 | if (nChHitInSt45 < 3 && currentSt > 2) { | |
574 | ||
575 | if (i == nClusters-1) { | |
576 | ||
577 | trackParam->SetRemovable(kFALSE); | |
578 | ||
579 | } else { | |
580 | ||
581 | nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i+1); | |
582 | nextCh = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
583 | ||
584 | // set clusters in the same chamber as being removable | |
585 | if (nextCh == currentCh) { | |
586 | trackParam->SetRemovable(kTRUE); | |
587 | nextTrackParam->SetRemovable(kTRUE); | |
588 | i++; // skip cluster already checked | |
589 | } else { | |
590 | trackParam->SetRemovable(kFALSE); | |
591 | } | |
592 | ||
593 | } | |
594 | ||
595 | } else { | |
596 | ||
597 | // skip clusters already flag as removable | |
598 | if (trackParam->IsRemovable()) continue; | |
599 | ||
600 | // loop over next track parameters | |
601 | for (Int_t j = i+1; j < nClusters; j++) { | |
602 | nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(j); | |
603 | ||
604 | nextCh = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
605 | nextSt = nextCh/2; | |
606 | ||
607 | // set clusters in the same station as being removable | |
608 | if (nextSt == currentSt) { | |
609 | trackParam->SetRemovable(kTRUE); | |
610 | nextTrackParam->SetRemovable(kTRUE); | |
611 | i++; // skip cluster already checked | |
612 | } | |
613 | ||
614 | } | |
615 | ||
616 | } | |
617 | ||
618 | } | |
619 | ||
620 | } | |
621 | ||
622 | //__________________________________________________________________________ | |
623 | Bool_t AliMUONTrack::ComputeLocalChi2(Bool_t accountForMCS) | |
624 | { | |
625 | /// Compute each cluster contribution to the chi2 of the track | |
626 | /// accounting for multiple scattering or not according to the flag | |
627 | /// - Also recompute the weight matrices of the attached clusters if accountForMCS=kTRUE | |
628 | /// - Assume that track parameters at each cluster are corrects | |
629 | /// - Return kFALSE if computation failed | |
630 | AliDebug(1,"Enter ComputeLocalChi2"); | |
631 | ||
632 | if (!fTrackParamAtCluster) { | |
633 | AliWarning("no cluster attached to this track"); | |
634 | return kFALSE; | |
635 | } | |
636 | ||
637 | if (accountForMCS) { // Compute local chi2 taking into account multiple scattering effects | |
638 | ||
639 | // Compute MCS covariance matrix only once | |
640 | Int_t nClusters = GetNClusters(); | |
641 | TMatrixD mcsCovariances(nClusters,nClusters); | |
642 | ComputeMCSCovariances(mcsCovariances); | |
643 | ||
644 | // Make sure cluster weights are consistent with following calculations | |
645 | if (!ComputeClusterWeights(&mcsCovariances)) { | |
646 | AliWarning("cannot take into account the multiple scattering effects"); | |
647 | return ComputeLocalChi2(kFALSE); | |
648 | } | |
649 | ||
650 | // Compute chi2 of the track | |
651 | Double_t globalChi2 = ComputeGlobalChi2(kTRUE); | |
652 | if (globalChi2 < 0.) return kFALSE; | |
653 | ||
654 | // Loop over removable clusters and compute their local chi2 | |
655 | AliMUONTrackParam* trackParamAtCluster; | |
656 | AliMUONTrackParam* trackParamAtCluster1; | |
657 | AliMUONVCluster *cluster, *discardedCluster; | |
658 | Int_t iCluster1, iCluster2, iCurrentCluster1, iCurrentCluster2; | |
659 | TMatrixD clusterWeightsNB(nClusters-1,nClusters-1); | |
660 | TMatrixD clusterWeightsB(nClusters-1,nClusters-1); | |
661 | Double_t *dX = new Double_t[nClusters-1]; | |
662 | Double_t *dY = new Double_t[nClusters-1]; | |
663 | Double_t globalChi2b; | |
664 | for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) { | |
665 | trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(iCluster)); | |
666 | ||
667 | discardedCluster = trackParamAtCluster->GetClusterPtr(); | |
668 | ||
669 | // Recompute cluster weights without the current cluster | |
670 | if (!ComputeClusterWeights(clusterWeightsNB, clusterWeightsB, &mcsCovariances, discardedCluster)) { | |
671 | AliWarning("cannot take into account the multiple scattering effects"); | |
672 | delete [] dX; | |
673 | delete [] dY; | |
674 | return ComputeLocalChi2(kFALSE); | |
675 | } | |
676 | ||
677 | // Compute track chi2 without the current cluster | |
678 | globalChi2b = 0.; | |
679 | iCurrentCluster1 = 0; | |
680 | for (iCluster1 = 0; iCluster1 < nClusters ; iCluster1++) { | |
681 | trackParamAtCluster1 = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1); | |
682 | cluster = trackParamAtCluster1->GetClusterPtr(); | |
683 | ||
684 | if (cluster == discardedCluster) continue; | |
685 | ||
686 | // Compute and save residuals | |
687 | dX[iCurrentCluster1] = cluster->GetX() - trackParamAtCluster1->GetNonBendingCoor(); | |
688 | dY[iCurrentCluster1] = cluster->GetY() - trackParamAtCluster1->GetBendingCoor(); | |
689 | ||
690 | iCurrentCluster2 = 0; | |
691 | for (iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) { | |
692 | cluster = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
693 | ||
694 | if (cluster == discardedCluster) continue; | |
695 | ||
696 | // Add contribution from covariances | |
697 | globalChi2b += (clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) + | |
698 | clusterWeightsNB(iCurrentCluster2, iCurrentCluster1)) * dX[iCurrentCluster1] * dX[iCurrentCluster2] + | |
699 | (clusterWeightsB(iCurrentCluster1, iCurrentCluster2) + | |
700 | clusterWeightsB(iCurrentCluster2, iCurrentCluster1)) * dY[iCurrentCluster1] * dY[iCurrentCluster2]; | |
701 | ||
702 | iCurrentCluster2++; | |
703 | } | |
704 | ||
705 | // Add contribution from variances | |
706 | globalChi2b += clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) * dX[iCurrentCluster1] * dX[iCurrentCluster1] + | |
707 | clusterWeightsB(iCurrentCluster1, iCurrentCluster1) * dY[iCurrentCluster1] * dY[iCurrentCluster1]; | |
708 | ||
709 | iCurrentCluster1++; | |
710 | } | |
711 | ||
712 | // Set local chi2 | |
713 | trackParamAtCluster->SetLocalChi2(globalChi2 - globalChi2b); | |
714 | } | |
715 | ||
716 | delete [] dX; | |
717 | delete [] dY; | |
718 | ||
719 | } else { // without multiple scattering effects | |
720 | ||
721 | Int_t nClusters = GetNClusters(); | |
722 | AliMUONTrackParam* trackParamAtCluster; | |
723 | AliMUONVCluster *discardedCluster; | |
724 | Double_t dX, dY; | |
725 | for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) { | |
726 | trackParamAtCluster = static_cast<AliMUONTrackParam*>(fTrackParamAtCluster->UncheckedAt(iCluster)); | |
727 | ||
728 | discardedCluster = trackParamAtCluster->GetClusterPtr(); | |
729 | ||
730 | // Compute residuals | |
731 | dX = discardedCluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
732 | dY = discardedCluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
733 | ||
734 | // Set local chi2 | |
735 | trackParamAtCluster->SetLocalChi2(dX * dX / discardedCluster->GetErrX2() + dY * dY / discardedCluster->GetErrY2()); | |
736 | } | |
737 | ||
738 | } | |
739 | ||
740 | return kTRUE; | |
741 | ||
742 | } | |
743 | ||
744 | //__________________________________________________________________________ | |
745 | Double_t AliMUONTrack::ComputeGlobalChi2(Bool_t accountForMCS) | |
746 | { | |
747 | /// Compute the chi2 of the track accounting for multiple scattering or not according to the flag | |
748 | /// - Assume that track parameters at each cluster are corrects | |
749 | /// - Assume the cluster weights matrices are corrects | |
750 | /// - Return a value of chi2 higher than the maximum allowed if computation failed | |
751 | AliDebug(1,"Enter ComputeGlobalChi2"); | |
752 | ||
753 | if (!fTrackParamAtCluster) { | |
754 | AliWarning("no cluster attached to this track"); | |
755 | return 2.*MaxChi2(); | |
756 | } | |
757 | ||
758 | Double_t chi2 = 0.; | |
759 | ||
760 | if (accountForMCS) { | |
761 | ||
762 | // Check the weight matrices. If weight matrices are not available compute chi2 without MCS | |
763 | if (!fClusterWeightsNonBending || !fClusterWeightsBending) { | |
764 | AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering"); | |
765 | return ComputeGlobalChi2(kFALSE); | |
766 | } | |
767 | Int_t nClusters = GetNClusters(); | |
768 | if (fClusterWeightsNonBending->GetNrows() != nClusters || fClusterWeightsBending->GetNcols() != nClusters) { | |
769 | AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering"); | |
770 | return ComputeGlobalChi2(kFALSE); | |
771 | } | |
772 | ||
773 | // Compute chi2 | |
774 | AliMUONVCluster *cluster; | |
775 | Double_t *dX = new Double_t[nClusters]; | |
776 | Double_t *dY = new Double_t[nClusters]; | |
777 | AliMUONTrackParam* trackParamAtCluster; | |
778 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
779 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1); | |
780 | cluster = trackParamAtCluster->GetClusterPtr(); | |
781 | dX[iCluster1] = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
782 | dY[iCluster1] = cluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
783 | for (Int_t iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) { | |
784 | chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster2) + (*fClusterWeightsNonBending)(iCluster2, iCluster1)) * dX[iCluster1] * dX[iCluster2] + | |
785 | ((*fClusterWeightsBending)(iCluster1, iCluster2) + (*fClusterWeightsBending)(iCluster2, iCluster1)) * dY[iCluster1] * dY[iCluster2]; | |
786 | } | |
787 | chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster1) * dX[iCluster1] * dX[iCluster1]) + | |
788 | ((*fClusterWeightsBending)(iCluster1, iCluster1) * dY[iCluster1] * dY[iCluster1]); | |
789 | } | |
790 | delete [] dX; | |
791 | delete [] dY; | |
792 | ||
793 | } else { | |
794 | ||
795 | AliMUONVCluster *cluster; | |
796 | Double_t dX, dY; | |
797 | AliMUONTrackParam* trackParamAtCluster; | |
798 | Int_t nClusters = GetNClusters(); | |
799 | for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) { | |
800 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster); | |
801 | cluster = trackParamAtCluster->GetClusterPtr(); | |
802 | dX = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
803 | dY = cluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
804 | chi2 += dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2(); | |
805 | } | |
806 | ||
807 | } | |
808 | ||
809 | return chi2; | |
810 | ||
811 | } | |
812 | ||
813 | //__________________________________________________________________________ | |
814 | Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD* mcsCovariances) | |
815 | { | |
816 | /// Compute the weight matrices of the attached clusters, in non bending and bending direction, | |
817 | /// accounting for multiple scattering correlations and cluster resolution | |
818 | /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily) | |
819 | /// - Assume that track parameters at each cluster are corrects | |
820 | /// - Return kFALSE if computation failed | |
821 | AliDebug(1,"Enter ComputeClusterWeights1"); | |
822 | ||
823 | if (!fTrackParamAtCluster) { | |
824 | AliWarning("no cluster attached to this track"); | |
825 | return kFALSE; | |
826 | } | |
827 | ||
828 | // Alocate memory | |
829 | Int_t nClusters = GetNClusters(); | |
830 | if (!fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(nClusters,nClusters); | |
831 | if (!fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(nClusters,nClusters); | |
832 | ||
833 | // Compute weights matrices | |
834 | if (!ComputeClusterWeights(*fClusterWeightsNonBending, *fClusterWeightsBending, mcsCovariances)) return kFALSE; | |
835 | ||
836 | return kTRUE; | |
837 | ||
838 | } | |
839 | ||
840 | //__________________________________________________________________________ | |
841 | Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD& clusterWeightsNB, TMatrixD& clusterWeightsB, | |
842 | TMatrixD* mcsCovariances, const AliMUONVCluster* discardedCluster) const | |
843 | { | |
844 | /// Compute the weight matrices, in non bending and bending direction, | |
845 | /// of the other attached clusters assuming the discarded one does not exist | |
846 | /// accounting for multiple scattering correlations and cluster resolution | |
847 | /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily) | |
848 | /// - Return kFALSE if computation failed | |
849 | AliDebug(1,"Enter ComputeClusterWeights2"); | |
850 | ||
851 | // Check MCS covariance matrix and recompute it if need | |
852 | Int_t nClusters = GetNClusters(); | |
853 | Bool_t deleteMCSCov = kFALSE; | |
854 | if (!mcsCovariances) { | |
855 | mcsCovariances = new TMatrixD(nClusters,nClusters); | |
856 | deleteMCSCov = kTRUE; | |
857 | ComputeMCSCovariances(*mcsCovariances); | |
858 | } | |
859 | ||
860 | // Resize the weights matrices; alocate memory | |
861 | if (discardedCluster) { | |
862 | clusterWeightsNB.ResizeTo(nClusters-1,nClusters-1); | |
863 | clusterWeightsB.ResizeTo(nClusters-1,nClusters-1); | |
864 | } else { | |
865 | clusterWeightsNB.ResizeTo(nClusters,nClusters); | |
866 | clusterWeightsB.ResizeTo(nClusters,nClusters); | |
867 | } | |
868 | ||
869 | // Define variables | |
870 | AliMUONVCluster *cluster1, *cluster2; | |
871 | Int_t iCurrentCluster1, iCurrentCluster2; | |
872 | ||
873 | // Compute the covariance matrices | |
874 | iCurrentCluster1 = 0; | |
875 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
876 | cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr(); | |
877 | ||
878 | if (cluster1 == discardedCluster) continue; | |
879 | ||
880 | // Loop over next clusters | |
881 | iCurrentCluster2 = iCurrentCluster1; | |
882 | for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) { | |
883 | cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
884 | ||
885 | if (cluster2 == discardedCluster) continue; | |
886 | ||
887 | // Fill with MCS covariances | |
888 | clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) = (*mcsCovariances)(iCluster1,iCluster2); | |
889 | ||
890 | // Equal contribution from multiple scattering in non bending and bending directions | |
891 | clusterWeightsB(iCurrentCluster1, iCurrentCluster2) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2); | |
892 | ||
893 | // Add contribution from cluster resolution to diagonal element and symmetrize the matrix | |
894 | if (iCurrentCluster1 == iCurrentCluster2) { | |
895 | ||
896 | // In non bending plane | |
897 | clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrX2(); | |
898 | // In bending plane | |
899 | clusterWeightsB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrY2(); | |
900 | ||
901 | } else { | |
902 | ||
903 | // In non bending plane | |
904 | clusterWeightsNB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2); | |
905 | // In bending plane | |
906 | clusterWeightsB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsB(iCurrentCluster1, iCurrentCluster2); | |
907 | ||
908 | } | |
909 | ||
910 | iCurrentCluster2++; | |
911 | } | |
912 | ||
913 | iCurrentCluster1++; | |
914 | } | |
915 | ||
916 | // Inversion of covariance matrices to get the weights | |
917 | if (clusterWeightsNB.Determinant() != 0 && clusterWeightsB.Determinant() != 0) { | |
918 | clusterWeightsNB.Invert(); | |
919 | clusterWeightsB.Invert(); | |
920 | } else { | |
921 | AliWarning(" Determinant = 0"); | |
922 | clusterWeightsNB.ResizeTo(0,0); | |
923 | clusterWeightsB.ResizeTo(0,0); | |
924 | if(deleteMCSCov) delete mcsCovariances; | |
925 | return kFALSE; | |
926 | } | |
927 | ||
928 | if(deleteMCSCov) delete mcsCovariances; | |
929 | ||
930 | return kTRUE; | |
931 | ||
932 | } | |
933 | ||
934 | //__________________________________________________________________________ | |
935 | void AliMUONTrack::ComputeMCSCovariances(TMatrixD& mcsCovariances) const | |
936 | { | |
937 | /// Compute the multiple scattering covariance matrix | |
938 | /// (assume that track parameters at each cluster are corrects) | |
939 | AliDebug(1,"Enter ComputeMCSCovariances"); | |
940 | ||
941 | // Reset the size of the covariance matrix if needed | |
942 | Int_t nClusters = GetNClusters(); | |
943 | if (mcsCovariances.GetNrows() != nClusters) mcsCovariances.ResizeTo(nClusters,nClusters); | |
944 | ||
945 | // Define variables | |
946 | Int_t nChambers = AliMUONConstants::NTrackingCh(); | |
947 | AliMUONTrackParam* trackParamAtCluster; | |
948 | AliMUONTrackParam extrapTrackParam; | |
949 | Int_t currentChamber = 0, expectedChamber = 0, size = 0; | |
950 | Double_t *mcsAngle2 = new Double_t[2*nChambers]; | |
951 | Double_t *zMCS = new Double_t[2*nChambers]; | |
952 | Int_t *indices = new Int_t[2*nClusters]; | |
953 | ||
954 | // Compute multiple scattering dispersion angle at each chamber | |
955 | // and save the z position where it is calculated | |
956 | for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) { | |
957 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster); | |
958 | ||
959 | // look for missing chambers if any | |
960 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); | |
961 | while (currentChamber > expectedChamber) { | |
962 | ||
963 | // Save the z position where MCS dispersion is calculated | |
964 | zMCS[size] = AliMUONConstants::DefaultChamberZ(expectedChamber); | |
965 | ||
966 | // Do not take into account MCS in chambers prior the first cluster | |
967 | if (iCluster > 0) { | |
968 | ||
969 | // Get track parameters at missing chamber z | |
970 | extrapTrackParam = *trackParamAtCluster; | |
971 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, zMCS[size]); | |
972 | ||
973 | // Save multiple scattering dispersion angle in missing chamber | |
974 | mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(expectedChamber),1.); | |
975 | ||
976 | } else mcsAngle2[size] = 0.; | |
977 | ||
978 | expectedChamber++; | |
979 | size++; | |
980 | } | |
981 | ||
982 | // Save z position where MCS dispersion is calculated | |
983 | zMCS[size] = trackParamAtCluster->GetZ(); | |
984 | ||
985 | // Save multiple scattering dispersion angle in current chamber | |
986 | mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(*trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(currentChamber),1.); | |
987 | ||
988 | // Save indice in zMCS array corresponding to the current cluster | |
989 | indices[iCluster] = size; | |
990 | ||
991 | expectedChamber = currentChamber + 1; | |
992 | size++; | |
993 | } | |
994 | ||
995 | // complete array of z if last cluster is on the last but one chamber | |
996 | if (currentChamber != nChambers-1) zMCS[size++] = AliMUONConstants::DefaultChamberZ(nChambers-1); | |
997 | ||
998 | // Compute the covariance matrix | |
999 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
1000 | ||
1001 | for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) { | |
1002 | ||
1003 | // Initialization to 0 (diagonal plus upper triangular part) | |
1004 | mcsCovariances(iCluster1,iCluster2) = 0.; | |
1005 | ||
1006 | // Compute contribution from multiple scattering in upstream chambers | |
1007 | for (Int_t k = 0; k < indices[iCluster1]; k++) { | |
1008 | mcsCovariances(iCluster1,iCluster2) += (zMCS[indices[iCluster1]] - zMCS[k]) * (zMCS[indices[iCluster2]] - zMCS[k]) * mcsAngle2[k]; | |
1009 | } | |
1010 | ||
1011 | // Symetrize the matrix | |
1012 | mcsCovariances(iCluster2,iCluster1) = mcsCovariances(iCluster1,iCluster2); | |
1013 | } | |
1014 | ||
1015 | } | |
1016 | ||
1017 | delete [] mcsAngle2; | |
1018 | delete [] zMCS; | |
1019 | delete [] indices; | |
1020 | ||
1021 | } | |
1022 | ||
1023 | //__________________________________________________________________________ | |
1024 | Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track, Int_t stMin, Int_t stMax) const | |
1025 | { | |
1026 | /// Returns the number of clusters in common in stations [stMin, stMax] | |
1027 | /// between the current track ("this") and the track pointed to by "track". | |
1028 | ||
1029 | if (!track || !track->fTrackParamAtCluster || !this->fTrackParamAtCluster) return 0; | |
1030 | ||
1031 | Int_t chMin = 2 * stMin; | |
1032 | Int_t chMax = 2 * stMax + 1; | |
1033 | Int_t clustersInCommon = 0; | |
1034 | ||
1035 | // Loop over clusters of first track | |
1036 | Int_t nCl1 = this->GetNClusters(); | |
1037 | for(Int_t iCl1 = 0; iCl1 < nCl1; iCl1++) { | |
1038 | AliMUONVCluster* cl1 = ((AliMUONTrackParam*) this->fTrackParamAtCluster->UncheckedAt(iCl1))->GetClusterPtr(); | |
1039 | ||
1040 | Int_t chCl1 = cl1->GetChamberId(); | |
1041 | if (chCl1 < chMin || chCl1 > chMax) continue; | |
1042 | ||
1043 | // Loop over clusters of second track | |
1044 | Int_t nCl2 = track->GetNClusters(); | |
1045 | for(Int_t iCl2 = 0; iCl2 < nCl2; iCl2++) { | |
1046 | AliMUONVCluster* cl2 = ((AliMUONTrackParam*) track->fTrackParamAtCluster->UncheckedAt(iCl2))->GetClusterPtr(); | |
1047 | ||
1048 | Int_t chCl2 = cl2->GetChamberId(); | |
1049 | if (chCl2 < chMin || chCl2 > chMax) continue; | |
1050 | ||
1051 | // Increment "clustersInCommon" if both clusters have the same ID | |
1052 | if (cl1->GetUniqueID() == cl2->GetUniqueID()) { | |
1053 | clustersInCommon++; | |
1054 | break; | |
1055 | } | |
1056 | ||
1057 | } | |
1058 | ||
1059 | } | |
1060 | ||
1061 | return clustersInCommon; | |
1062 | } | |
1063 | ||
1064 | //__________________________________________________________________________ | |
1065 | Int_t AliMUONTrack::GetNDF() const | |
1066 | { | |
1067 | /// return the number of degrees of freedom | |
1068 | ||
1069 | Int_t ndf = 2 * GetNClusters() - 5; | |
1070 | return (ndf > 0) ? ndf : 0; | |
1071 | } | |
1072 | ||
1073 | //__________________________________________________________________________ | |
1074 | Double_t AliMUONTrack::GetNormalizedChi2() const | |
1075 | { | |
1076 | /// return the chi2 value divided by the number of degrees of freedom (or FLT_MAX if ndf <= 0) | |
1077 | ||
1078 | Double_t ndf = (Double_t) GetNDF(); | |
1079 | return (ndf > 0.) ? fGlobalChi2 / ndf : 2.*MaxChi2(); | |
1080 | } | |
1081 | ||
1082 | //__________________________________________________________________________ | |
1083 | Int_t AliMUONTrack::FindCompatibleClusters(const AliMUONTrack &track, Double_t sigmaCut, Bool_t compatibleCluster[10]) const | |
1084 | { | |
1085 | /// Try to match clusters from this track with clusters from the given track within the provided sigma cut: | |
1086 | /// - Fill the array compatibleCluster[iCh] with kTRUE if a compatible cluster has been found in chamber iCh. | |
1087 | /// - Return the number of clusters of "this" track matched with one cluster of the given track. | |
1088 | AliMUONVCluster *cluster1, *cluster2; | |
1089 | Double_t chi2, dX, dY; | |
1090 | Double_t chi2Max = sigmaCut * sigmaCut; | |
1091 | ||
1092 | // initialization | |
1093 | Int_t nMatchClusters = 0; | |
1094 | for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) compatibleCluster[ch] = kFALSE; | |
1095 | ||
1096 | if (!track.fTrackParamAtCluster || !this->fTrackParamAtCluster) return nMatchClusters; | |
1097 | ||
1098 | // Loop over clusters of first track | |
1099 | Int_t nCl1 = this->GetNClusters(); | |
1100 | for(Int_t iCl1 = 0; iCl1 < nCl1; iCl1++) { | |
1101 | cluster1 = static_cast<AliMUONTrackParam*>(this->fTrackParamAtCluster->UncheckedAt(iCl1))->GetClusterPtr(); | |
1102 | ||
1103 | // Loop over clusters of second track | |
1104 | Int_t nCl2 = track.GetNClusters(); | |
1105 | for(Int_t iCl2 = 0; iCl2 < nCl2; iCl2++) { | |
1106 | cluster2 = static_cast<AliMUONTrackParam*>(track.fTrackParamAtCluster->UncheckedAt(iCl2))->GetClusterPtr(); | |
1107 | ||
1108 | // check DE Id | |
1109 | if (cluster1->GetDetElemId() != cluster2->GetDetElemId()) continue; | |
1110 | ||
1111 | // check local chi2 | |
1112 | dX = cluster1->GetX() - cluster2->GetX(); | |
1113 | dY = cluster1->GetY() - cluster2->GetY(); | |
1114 | chi2 = dX * dX / (cluster1->GetErrX2() + cluster2->GetErrX2()) + dY * dY / (cluster1->GetErrY2() + cluster2->GetErrY2()); | |
1115 | if (chi2 > 2. * chi2Max) continue; // 2 because 2 quantities in chi2 | |
1116 | ||
1117 | compatibleCluster[cluster1->GetChamberId()] = kTRUE; | |
1118 | nMatchClusters++; | |
1119 | break; | |
1120 | } | |
1121 | ||
1122 | } | |
1123 | ||
1124 | return nMatchClusters; | |
1125 | } | |
1126 | ||
1127 | //__________________________________________________________________________ | |
1128 | Bool_t AliMUONTrack::Match(AliMUONTrack &track, Double_t sigmaCut, Int_t &nMatchClusters) const | |
1129 | { | |
1130 | /// Try to match this track with the given track. Matching conditions: | |
1131 | /// - more than 50% of clusters from this track matched with clusters from the given track | |
1132 | /// - at least 1 cluster matched before and 1 cluster matched after the dipole | |
1133 | ||
1134 | Bool_t compTrack[10]; | |
1135 | nMatchClusters = FindCompatibleClusters(track, sigmaCut, compTrack); | |
1136 | ||
1137 | if ((compTrack[0] || compTrack[1] || compTrack[2] || compTrack[3]) && // at least 1 cluster matched in st 1 & 2 | |
1138 | (compTrack[6] || compTrack[7] || compTrack[8] || compTrack[9]) && // at least 1 cluster matched in st 4 & 5 | |
1139 | 2 * nMatchClusters > GetNClusters()) return kTRUE; // more than 50% of clusters matched | |
1140 | else return kFALSE; | |
1141 | ||
1142 | } | |
1143 | ||
1144 | //__________________________________________________________________________ | |
1145 | void AliMUONTrack::SetTrackParamAtVertex(const AliMUONTrackParam* trackParam) | |
1146 | { | |
1147 | /// set track parameters at vertex | |
1148 | if (trackParam == 0x0) return; | |
1149 | if (fTrackParamAtVertex) *fTrackParamAtVertex = *trackParam; | |
1150 | else fTrackParamAtVertex = new AliMUONTrackParam(*trackParam); | |
1151 | } | |
1152 | ||
1153 | //__________________________________________________________________________ | |
1154 | void AliMUONTrack::RecursiveDump() const | |
1155 | { | |
1156 | /// Recursive dump of AliMUONTrack, i.e. with dump of trackParamAtCluster and attached clusters | |
1157 | AliMUONTrackParam *trackParamAtCluster; | |
1158 | AliMUONVCluster *cluster; | |
1159 | cout << "Recursive dump of Track: " << this << endl; | |
1160 | // Track | |
1161 | this->Dump(); | |
1162 | for (Int_t iCluster = 0; iCluster < GetNClusters(); iCluster++) { | |
1163 | trackParamAtCluster = (AliMUONTrackParam*) ((*fTrackParamAtCluster)[iCluster]); | |
1164 | // trackParamAtCluster | |
1165 | cout << "trackParamAtCluster: " << trackParamAtCluster << " (index: " << iCluster << ")" << endl; | |
1166 | trackParamAtCluster->Dump(); | |
1167 | cluster = trackParamAtCluster->GetClusterPtr(); | |
1168 | // cluster | |
1169 | cout << "cluster: " << cluster << endl; | |
1170 | cluster->Print(); | |
1171 | } | |
1172 | return; | |
1173 | } | |
1174 | ||
1175 | //_____________________________________________- | |
1176 | void AliMUONTrack::Print(Option_t*) const | |
1177 | { | |
1178 | /// Printing Track information | |
1179 | ||
1180 | streamsize curW = cout.width(); | |
1181 | streamsize curPrecision = cout.precision(); | |
1182 | cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNClusters() << | |
1183 | ", Match2Trig=" << setw(1) << GetMatchTrigger() << | |
1184 | ", LoTrgNum=" << setw(3) << LoCircuit() << | |
1185 | ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger(); | |
1186 | cout << Form(" HitTriggerPattern %x",fHitsPatternInTrigCh); | |
1187 | cout << Form(" MClabel=%d",fTrackID) << endl; | |
1188 | if (fTrackParamAtCluster) fTrackParamAtCluster->First()->Print("FULL"); | |
1189 | cout.width(curW); | |
1190 | cout.precision(curPrecision); | |
1191 | } | |
1192 | ||
1193 | //__________________________________________________________________________ | |
1194 | void AliMUONTrack::SetLocalTrigger(Int_t loCirc, Int_t loStripX, Int_t loStripY, Int_t loDev, Int_t loLpt, Int_t loHpt, UChar_t respWithoutChamber) | |
1195 | { | |
1196 | /// pack the local trigger information and store | |
1197 | ||
1198 | if (loCirc < 0) return; | |
1199 | ||
1200 | fLocalTrigger = 0; | |
1201 | fLocalTrigger += loCirc; | |
1202 | fLocalTrigger += loStripX << 8; | |
1203 | fLocalTrigger += loStripY << 13; | |
1204 | fLocalTrigger += loDev << 17; | |
1205 | fLocalTrigger += loLpt << 22; | |
1206 | fLocalTrigger += loHpt << 24; | |
1207 | fLocalTrigger += respWithoutChamber << 26; | |
1208 | ||
1209 | } | |
1210 | ||
1211 | //__________________________________________________________________________ | |
1212 | void AliMUONTrack::FindMCLabel() | |
1213 | { | |
1214 | /// Determine the MC label from the label of the attached clusters and fill fMCLabel data member: | |
1215 | /// More than 50% of clusters, including 1 before and 1 after the dipole, must share the same label | |
1216 | ||
1217 | Int_t nClusters = GetNClusters(); | |
1218 | Int_t halfCluster = nClusters/2; | |
1219 | ||
1220 | // reset MC label | |
1221 | fTrackID = -1; | |
1222 | ||
1223 | // loop over first clusters (if nClusters left < (nClusters-halfCluster) the conditions cannot be fulfilled) | |
1224 | for (Int_t iCluster1 = 0; iCluster1 < nClusters-halfCluster; iCluster1++) { | |
1225 | AliMUONVCluster* cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr(); | |
1226 | ||
1227 | // if the first cluster is not on station 1 or 2 the conditions cannot be fulfilled | |
1228 | if (cluster1->GetChamberId() > 3) return; | |
1229 | ||
1230 | Int_t label1 = cluster1->GetMCLabel(); | |
1231 | if (label1 < 0) continue; | |
1232 | ||
1233 | Int_t nIdenticalLabel = 1; | |
1234 | ||
1235 | // Loop over next clusters | |
1236 | for (Int_t iCluster2 = iCluster1+1; iCluster2 < nClusters; iCluster2++) { | |
1237 | AliMUONVCluster* cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
1238 | ||
1239 | if (cluster2->GetMCLabel() != label1) continue; | |
1240 | ||
1241 | nIdenticalLabel++; | |
1242 | ||
1243 | // stop as soon as conditions are fulfilled | |
1244 | if (nIdenticalLabel > halfCluster && cluster2->GetChamberId() > 5) { | |
1245 | fTrackID = label1; | |
1246 | return; | |
1247 | } | |
1248 | ||
1249 | } | |
1250 | ||
1251 | } | |
1252 | ||
1253 | } | |
1254 |