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a9e2aefa | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
a9e2aefa | 17 | |
3d1463c8 | 18 | //----------------------------------------------------------------------------- |
19 | // Class AliMUONTrack | |
20 | //------------------- | |
21 | // Reconstructed track in ALICE dimuon spectrometer | |
22 | //----------------------------------------------------------------------------- | |
a9e2aefa | 23 | |
63ed9c6b | 24 | #include "AliMUONTrack.h" |
34f1bfa0 | 25 | |
9bf6860b | 26 | #include "AliMUONReconstructor.h" |
103e6575 | 27 | #include "AliMUONVCluster.h" |
28 | #include "AliMUONVClusterStore.h" | |
7332f213 | 29 | #include "AliMUONObjectPair.h" |
7332f213 | 30 | #include "AliMUONTrackExtrap.h" |
933daf4c | 31 | #include "AliMUONConstants.h" |
32 | #include "AliMUONTrackParam.h" | |
a9e2aefa | 33 | |
63ed9c6b | 34 | #include "AliLog.h" |
35 | ||
63ed9c6b | 36 | #include <TMath.h> |
63ed9c6b | 37 | |
ea94c18b | 38 | #include <Riostream.h> |
39 | ||
7945aae7 | 40 | /// \cond CLASSIMP |
63ed9c6b | 41 | ClassImp(AliMUONTrack) // Class implementation in ROOT context |
7945aae7 | 42 | /// \endcond |
63ed9c6b | 43 | |
44 | //__________________________________________________________________________ | |
30178c30 | 45 | AliMUONTrack::AliMUONTrack() |
54d7ba50 | 46 | : TObject(), |
7332f213 | 47 | fTrackParamAtCluster(0x0), |
208f139e | 48 | fFitWithVertex(kFALSE), |
96ebe67e | 49 | fVertexErrXY2(), |
ea94c18b | 50 | fFitWithMCS(kFALSE), |
96ebe67e | 51 | fClusterWeightsNonBending(0x0), |
52 | fClusterWeightsBending(0x0), | |
ea94c18b | 53 | fGlobalChi2(-1.), |
54 | fImproved(kFALSE), | |
7771752e | 55 | fMatchTrigger(-1), |
c6ba19f7 | 56 | floTrgNum(-1), |
54d7ba50 | 57 | fChi2MatchTrigger(0.), |
2e2d0c44 | 58 | fTrackID(-1), |
96ebe67e | 59 | fTrackParamAtVertex(0x0), |
423b32ca | 60 | fHitsPatternInTrigCh(0), |
01413742 | 61 | fLocalTrigger(0) |
d837040f | 62 | { |
2457f726 | 63 | /// Default constructor |
96ebe67e | 64 | fVertexErrXY2[0] = 0.; |
65 | fVertexErrXY2[1] = 0.; | |
d837040f | 66 | } |
67 | ||
a9e2aefa | 68 | //__________________________________________________________________________ |
a0dc65b4 | 69 | AliMUONTrack::AliMUONTrack(AliMUONObjectPair *segment, Double_t bendingVertexDispersion) |
54d7ba50 | 70 | : TObject(), |
96ebe67e | 71 | fTrackParamAtCluster(new TClonesArray("AliMUONTrackParam",10)), |
208f139e | 72 | fFitWithVertex(kFALSE), |
96ebe67e | 73 | fVertexErrXY2(), |
ea94c18b | 74 | fFitWithMCS(kFALSE), |
96ebe67e | 75 | fClusterWeightsNonBending(0x0), |
76 | fClusterWeightsBending(0x0), | |
ea94c18b | 77 | fGlobalChi2(0.), |
78 | fImproved(kFALSE), | |
7771752e | 79 | fMatchTrigger(-1), |
c6ba19f7 | 80 | floTrgNum(-1), |
54d7ba50 | 81 | fChi2MatchTrigger(0.), |
2e2d0c44 | 82 | fTrackID(-1), |
96ebe67e | 83 | fTrackParamAtVertex(0x0), |
423b32ca | 84 | fHitsPatternInTrigCh(0), |
01413742 | 85 | fLocalTrigger(0) |
a9e2aefa | 86 | { |
96ebe67e | 87 | /// Constructor from two clusters |
de2cd600 | 88 | |
96ebe67e | 89 | fVertexErrXY2[0] = 0.; |
90 | fVertexErrXY2[1] = 0.; | |
208f139e | 91 | |
96ebe67e | 92 | // Pointers to clusters from the segment |
9bf6860b | 93 | AliMUONVCluster* firstCluster = (AliMUONVCluster*) segment->First(); |
94 | AliMUONVCluster* lastCluster = (AliMUONVCluster*) segment->Second(); | |
208f139e | 95 | |
ea94c18b | 96 | // Compute track parameters |
96ebe67e | 97 | Double_t z1 = firstCluster->GetZ(); |
98 | Double_t z2 = lastCluster->GetZ(); | |
99 | Double_t dZ = z1 - z2; | |
208f139e | 100 | // Non bending plane |
96ebe67e | 101 | Double_t nonBendingCoor1 = firstCluster->GetX(); |
102 | Double_t nonBendingCoor2 = lastCluster->GetX(); | |
ea94c18b | 103 | Double_t nonBendingSlope = (nonBendingCoor1 - nonBendingCoor2) / dZ; |
208f139e | 104 | // Bending plane |
96ebe67e | 105 | Double_t bendingCoor1 = firstCluster->GetY(); |
106 | Double_t bendingCoor2 = lastCluster->GetY(); | |
ea94c18b | 107 | Double_t bendingSlope = (bendingCoor1 - bendingCoor2) / dZ; |
208f139e | 108 | // Inverse bending momentum |
96ebe67e | 109 | Double_t bendingImpact = bendingCoor1 - z1 * bendingSlope; |
208f139e | 110 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); |
ea94c18b | 111 | |
9bf6860b | 112 | // Set track parameters at first cluster |
96ebe67e | 113 | AliMUONTrackParam trackParamAtFirstCluster; |
114 | trackParamAtFirstCluster.SetZ(z1); | |
115 | trackParamAtFirstCluster.SetNonBendingCoor(nonBendingCoor1); | |
116 | trackParamAtFirstCluster.SetNonBendingSlope(nonBendingSlope); | |
117 | trackParamAtFirstCluster.SetBendingCoor(bendingCoor1); | |
118 | trackParamAtFirstCluster.SetBendingSlope(bendingSlope); | |
119 | trackParamAtFirstCluster.SetInverseBendingMomentum(inverseBendingMomentum); | |
208f139e | 120 | |
9bf6860b | 121 | // Set track parameters at last cluster |
96ebe67e | 122 | AliMUONTrackParam trackParamAtLastCluster; |
123 | trackParamAtLastCluster.SetZ(z2); | |
124 | trackParamAtLastCluster.SetNonBendingCoor(nonBendingCoor2); | |
125 | trackParamAtLastCluster.SetNonBendingSlope(nonBendingSlope); | |
126 | trackParamAtLastCluster.SetBendingCoor(bendingCoor2); | |
127 | trackParamAtLastCluster.SetBendingSlope(bendingSlope); | |
128 | trackParamAtLastCluster.SetInverseBendingMomentum(inverseBendingMomentum); | |
ea94c18b | 129 | |
9bf6860b | 130 | // Compute and set track parameters covariances at first cluster |
131 | TMatrixD paramCov(5,5); | |
132 | paramCov.Zero(); | |
208f139e | 133 | // Non bending plane |
9bf6860b | 134 | paramCov(0,0) = firstCluster->GetErrX2(); |
135 | paramCov(0,1) = firstCluster->GetErrX2() / dZ; | |
136 | paramCov(1,0) = paramCov(0,1); | |
137 | paramCov(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ; | |
208f139e | 138 | // Bending plane |
9bf6860b | 139 | paramCov(2,2) = firstCluster->GetErrY2(); |
140 | paramCov(2,3) = firstCluster->GetErrY2() / dZ; | |
141 | paramCov(3,2) = paramCov(2,3); | |
142 | paramCov(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ; | |
143 | // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field) | |
a0dc65b4 | 144 | paramCov(4,4) = ( ( bendingVertexDispersion*bendingVertexDispersion + |
9bf6860b | 145 | (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) / |
a0dc65b4 | 146 | bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum ; |
9bf6860b | 147 | paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; |
148 | paramCov(4,2) = paramCov(2,4); | |
149 | paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ; | |
150 | paramCov(4,3) = paramCov(3,4); | |
ea94c18b | 151 | |
ea94c18b | 152 | // Set covariances |
9bf6860b | 153 | trackParamAtFirstCluster.SetCovariances(paramCov); |
ea94c18b | 154 | |
9bf6860b | 155 | // Compute and set track parameters covariances at last cluster |
156 | paramCov(1,0) = - paramCov(1,0); | |
157 | paramCov(0,1) = - paramCov(0,1); | |
158 | paramCov(3,2) = - paramCov(3,2); | |
159 | paramCov(2,3) = - paramCov(2,3); | |
160 | paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ; | |
161 | paramCov(4,2) = paramCov(2,4); | |
162 | trackParamAtLastCluster.SetCovariances(paramCov); | |
ea94c18b | 163 | |
96ebe67e | 164 | // Add track parameters at clusters |
165 | AddTrackParamAtCluster(trackParamAtFirstCluster,*firstCluster); | |
166 | AddTrackParamAtCluster(trackParamAtLastCluster,*lastCluster); | |
de2cd600 | 167 | |
a9e2aefa | 168 | } |
169 | ||
61fed964 | 170 | //__________________________________________________________________________ |
96ebe67e | 171 | AliMUONTrack::AliMUONTrack(const AliMUONTrack& track) |
ea94c18b | 172 | : TObject(track), |
7332f213 | 173 | fTrackParamAtCluster(0x0), |
ea94c18b | 174 | fFitWithVertex(track.fFitWithVertex), |
96ebe67e | 175 | fVertexErrXY2(), |
ea94c18b | 176 | fFitWithMCS(track.fFitWithMCS), |
96ebe67e | 177 | fClusterWeightsNonBending(0x0), |
178 | fClusterWeightsBending(0x0), | |
ea94c18b | 179 | fGlobalChi2(track.fGlobalChi2), |
180 | fImproved(track.fImproved), | |
181 | fMatchTrigger(track.fMatchTrigger), | |
182 | floTrgNum(track.floTrgNum), | |
183 | fChi2MatchTrigger(track.fChi2MatchTrigger), | |
184 | fTrackID(track.fTrackID), | |
96ebe67e | 185 | fTrackParamAtVertex(0x0), |
ea94c18b | 186 | fHitsPatternInTrigCh(track.fHitsPatternInTrigCh), |
187 | fLocalTrigger(track.fLocalTrigger) | |
a9e2aefa | 188 | { |
2457f726 | 189 | ///copy constructor |
de2cd600 | 190 | |
e516b01d | 191 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
7332f213 | 192 | if (track.fTrackParamAtCluster) { |
193 | fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10); | |
194 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->First(); | |
195 | while (trackParamAtCluster) { | |
196 | new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(*trackParamAtCluster); | |
197 | trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster); | |
198 | } | |
208f139e | 199 | } |
200 | ||
96ebe67e | 201 | // copy vertex resolution square used during the tracking procedure |
202 | fVertexErrXY2[0] = track.fVertexErrXY2[0]; | |
203 | fVertexErrXY2[1] = track.fVertexErrXY2[1]; | |
208f139e | 204 | |
96ebe67e | 205 | // copy cluster weights matrices if any |
206 | if (track.fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending)); | |
207 | if (track.fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending)); | |
ea94c18b | 208 | |
96ebe67e | 209 | // copy track parameters at vertex if any |
210 | if (track.fTrackParamAtVertex) fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex)); | |
208f139e | 211 | |
a9e2aefa | 212 | } |
213 | ||
956019b6 | 214 | //__________________________________________________________________________ |
ea94c18b | 215 | AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& track) |
a9e2aefa | 216 | { |
2457f726 | 217 | /// Asignment operator |
30178c30 | 218 | // check assignement to self |
ea94c18b | 219 | if (this == &track) |
a9e2aefa | 220 | return *this; |
61adb9bd | 221 | |
30178c30 | 222 | // base class assignement |
ea94c18b | 223 | TObject::operator=(track); |
7332f213 | 224 | |
225 | // clear memory | |
226 | Clear(); | |
227 | ||
228 | // necessary to make a copy of the objects and not only the pointers in TClonesArray | |
229 | if (track.fTrackParamAtCluster) { | |
230 | fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10); | |
231 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->First(); | |
232 | while (trackParamAtCluster) { | |
233 | new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(*trackParamAtCluster); | |
234 | trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster); | |
235 | } | |
208f139e | 236 | } |
237 | ||
96ebe67e | 238 | // copy cluster weights matrix if any |
239 | if (track.fClusterWeightsNonBending) { | |
240 | if (fClusterWeightsNonBending) { | |
241 | fClusterWeightsNonBending->ResizeTo(*(track.fClusterWeightsNonBending)); | |
242 | *fClusterWeightsNonBending = *(track.fClusterWeightsNonBending); | |
243 | } else fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending)); | |
208f139e | 244 | } |
245 | ||
96ebe67e | 246 | // copy cluster weights matrix if any |
247 | if (track.fClusterWeightsBending) { | |
248 | if (fClusterWeightsBending) { | |
249 | fClusterWeightsBending->ResizeTo(*(track.fClusterWeightsBending)); | |
250 | *fClusterWeightsBending = *(track.fClusterWeightsBending); | |
251 | } else fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending)); | |
ea94c18b | 252 | } |
253 | ||
96ebe67e | 254 | // copy track parameters at vertex if any |
255 | if (track.fTrackParamAtVertex) { | |
256 | if (fTrackParamAtVertex) *fTrackParamAtVertex = *(track.fTrackParamAtVertex); | |
257 | else fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex)); | |
ea94c18b | 258 | } |
de2cd600 | 259 | |
ea94c18b | 260 | fFitWithVertex = track.fFitWithVertex; |
96ebe67e | 261 | fVertexErrXY2[0] = track.fVertexErrXY2[0]; |
262 | fVertexErrXY2[1] = track.fVertexErrXY2[1]; | |
ea94c18b | 263 | fFitWithMCS = track.fFitWithMCS; |
264 | fGlobalChi2 = track.fGlobalChi2; | |
265 | fImproved = track.fImproved; | |
266 | fMatchTrigger = track.fMatchTrigger; | |
267 | floTrgNum = track.floTrgNum; | |
268 | fChi2MatchTrigger = track.fChi2MatchTrigger; | |
269 | fTrackID = track.fTrackID; | |
270 | fHitsPatternInTrigCh = track.fHitsPatternInTrigCh; | |
271 | fLocalTrigger = track.fLocalTrigger; | |
30178c30 | 272 | |
61adb9bd | 273 | return *this; |
a9e2aefa | 274 | } |
275 | ||
8429a5e4 | 276 | //__________________________________________________________________________ |
ea94c18b | 277 | AliMUONTrack::~AliMUONTrack() |
278 | { | |
279 | /// Destructor | |
96ebe67e | 280 | delete fTrackParamAtCluster; |
281 | delete fClusterWeightsNonBending; | |
282 | delete fClusterWeightsBending; | |
283 | delete fTrackParamAtVertex; | |
ea94c18b | 284 | } |
285 | ||
286 | //__________________________________________________________________________ | |
287 | void AliMUONTrack::Clear(Option_t* opt) | |
288 | { | |
289 | /// Clear arrays | |
7332f213 | 290 | if (opt && opt[0] == 'C' && fTrackParamAtCluster) fTrackParamAtCluster->Clear("C"); |
291 | else { | |
292 | delete fTrackParamAtCluster; | |
293 | fTrackParamAtCluster = 0x0; | |
294 | } | |
96ebe67e | 295 | delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0; |
296 | delete fClusterWeightsBending; fClusterWeightsBending = 0x0; | |
297 | delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0; | |
ea94c18b | 298 | } |
299 | ||
b1fea02e | 300 | //__________________________________________________________________________ |
301 | void AliMUONTrack::Reset() | |
302 | { | |
303 | /// Reset to default values | |
304 | SetUniqueID(0); | |
305 | fFitWithVertex = kFALSE; | |
306 | fVertexErrXY2[0] = 0.; | |
307 | fVertexErrXY2[1] = 0.; | |
308 | fFitWithMCS = kFALSE; | |
309 | fGlobalChi2 = -1.; | |
310 | fImproved = kFALSE; | |
311 | fMatchTrigger = -1; | |
312 | floTrgNum = -1; | |
313 | fChi2MatchTrigger = 0.; | |
2e2d0c44 | 314 | fTrackID = -1; |
b1fea02e | 315 | fHitsPatternInTrigCh = 0; |
316 | fLocalTrigger = 0; | |
317 | delete fTrackParamAtCluster; fTrackParamAtCluster = 0x0; | |
318 | delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0; | |
319 | delete fClusterWeightsBending; fClusterWeightsBending = 0x0; | |
320 | delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0; | |
321 | } | |
322 | ||
7332f213 | 323 | //__________________________________________________________________________ |
324 | TClonesArray* AliMUONTrack::GetTrackParamAtCluster() const | |
325 | { | |
326 | /// return array of track parameters at cluster (create it if needed) | |
327 | if (!fTrackParamAtCluster) fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10); | |
328 | return fTrackParamAtCluster; | |
329 | } | |
330 | ||
ea94c18b | 331 | //__________________________________________________________________________ |
96ebe67e | 332 | void AliMUONTrack::AddTrackParamAtCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster &cluster, Bool_t copy) |
8429a5e4 | 333 | { |
96ebe67e | 334 | /// Copy given track parameters into a new TrackParamAtCluster |
335 | /// Link parameters with the associated cluster | |
336 | /// If copy=kTRUE: the cluster is copied then passed the trackParam which become its owner | |
337 | /// otherwise: make sure to do not delete the cluster until it is used by the track | |
338 | ||
339 | // check chamber ID of the associated cluster | |
340 | if (cluster.GetChamberId() < 0 || cluster.GetChamberId() > AliMUONConstants::NTrackingCh()) { | |
341 | AliError(Form("Chamber ID of the associated cluster is not valid (ChamberId=%d)",cluster.GetChamberId())); | |
ea94c18b | 342 | return; |
343 | } | |
344 | ||
96ebe67e | 345 | // check whether track parameters are given at the correct cluster z position |
346 | if (cluster.GetZ() != trackParam.GetZ()) { | |
347 | AliError("track parameters are given at a different z position than the one of the associated cluster"); | |
ea94c18b | 348 | return; |
349 | } | |
350 | ||
96ebe67e | 351 | // add parameters to the array of track parameters |
7332f213 | 352 | if (!fTrackParamAtCluster) fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10); |
96ebe67e | 353 | AliMUONTrackParam* trackParamAtCluster = new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(trackParam); |
354 | ||
355 | // link parameters with the associated cluster or its copy | |
356 | if (copy) { | |
1467f4ba | 357 | AliMUONVCluster *clusterCopy = static_cast<AliMUONVCluster*>(cluster.Clone()); |
96ebe67e | 358 | trackParamAtCluster->SetClusterPtr(clusterCopy, kTRUE); |
359 | } else trackParamAtCluster->SetClusterPtr(&cluster); | |
7332f213 | 360 | |
361 | // sort the array of track parameters | |
362 | fTrackParamAtCluster->Sort(); | |
ea94c18b | 363 | } |
364 | ||
956019b6 | 365 | //__________________________________________________________________________ |
96ebe67e | 366 | void AliMUONTrack::RemoveTrackParamAtCluster(AliMUONTrackParam *trackParam) |
956019b6 | 367 | { |
96ebe67e | 368 | /// Remove trackParam from the array of TrackParamAtCluster |
7332f213 | 369 | if (!fTrackParamAtCluster || !fTrackParamAtCluster->Remove(trackParam)) { |
96ebe67e | 370 | AliWarning("object to remove does not exist in array fTrackParamAtCluster"); |
371 | return; | |
372 | } | |
de2cd600 | 373 | |
96ebe67e | 374 | fTrackParamAtCluster->Compress(); |
04b5ea16 | 375 | } |
376 | ||
ea94c18b | 377 | //__________________________________________________________________________ |
96ebe67e | 378 | void AliMUONTrack::UpdateTrackParamAtCluster() |
d2b1e7bb | 379 | { |
96ebe67e | 380 | /// Update track parameters at each attached cluster |
ea94c18b | 381 | |
96ebe67e | 382 | if (GetNClusters() == 0) { |
383 | AliWarning("no cluster attached to the track"); | |
ea94c18b | 384 | return; |
385 | } | |
386 | ||
96ebe67e | 387 | AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
388 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam); | |
389 | while (trackParamAtCluster) { | |
ea94c18b | 390 | |
391 | // reset track parameters and their covariances | |
96ebe67e | 392 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
393 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
ea94c18b | 394 | |
395 | // extrapolation to the given z | |
96ebe67e | 396 | AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ()); |
ea94c18b | 397 | |
398 | // prepare next step | |
96ebe67e | 399 | startingTrackParam = trackParamAtCluster; |
400 | trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster)); | |
ea94c18b | 401 | } |
402 | ||
d2b1e7bb | 403 | } |
404 | ||
b8dc484b | 405 | //__________________________________________________________________________ |
96ebe67e | 406 | void AliMUONTrack::UpdateCovTrackParamAtCluster() |
ea94c18b | 407 | { |
96ebe67e | 408 | /// Update track parameters and their covariances at each attached cluster |
409 | /// Include effects of multiple scattering in chambers | |
ea94c18b | 410 | |
96ebe67e | 411 | if (GetNClusters() == 0) { |
412 | AliWarning("no cluster attached to the track"); | |
ea94c18b | 413 | return; |
414 | } | |
415 | ||
96ebe67e | 416 | AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
417 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam); | |
418 | Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() + 1; | |
419 | Int_t currentChamber; | |
420 | while (trackParamAtCluster) { | |
ea94c18b | 421 | |
422 | // reset track parameters and their covariances | |
96ebe67e | 423 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
424 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
425 | trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances()); | |
ea94c18b | 426 | |
96ebe67e | 427 | // add MCS effect |
428 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.); | |
429 | ||
430 | // add MCS in missing chambers if any | |
431 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); | |
432 | while (currentChamber > expectedChamber) { | |
433 | // extrapolation to the missing chamber | |
434 | AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber)); | |
435 | // add MCS effect | |
436 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.); | |
437 | expectedChamber++; | |
438 | } | |
439 | ||
440 | // extrapolation to the z of the current cluster | |
441 | AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ()); | |
ea94c18b | 442 | |
443 | // prepare next step | |
96ebe67e | 444 | expectedChamber = currentChamber + 1; |
445 | startingTrackParam = trackParamAtCluster; | |
446 | trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster)); | |
ea94c18b | 447 | } |
96ebe67e | 448 | |
7332f213 | 449 | } |
450 | ||
451 | //__________________________________________________________________________ | |
a0dc65b4 | 452 | Bool_t AliMUONTrack::IsValid(UInt_t requestedStationMask) |
7332f213 | 453 | { |
3d7acbb7 | 454 | /// check the validity of the current track: |
455 | /// at least one cluster per requested station | |
456 | /// and at least 2 chambers in stations 4 & 5 that contain cluster(s) | |
7332f213 | 457 | |
458 | Int_t nClusters = GetNClusters(); | |
459 | AliMUONTrackParam *trackParam; | |
3d7acbb7 | 460 | Int_t currentCh, currentSt, previousCh = -1, nChHitInSt45 = 0; |
ad3c6eda | 461 | UInt_t presentStationMask(0); |
7332f213 | 462 | |
3d7acbb7 | 463 | // first loop over clusters |
ad3c6eda | 464 | for (Int_t i = 0; i < nClusters; i++) { |
7332f213 | 465 | trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i); |
3d7acbb7 | 466 | |
467 | currentCh = trackParam->GetClusterPtr()->GetChamberId(); | |
468 | currentSt = currentCh/2; | |
469 | ||
470 | // build present station mask | |
471 | presentStationMask |= ( 1 << currentSt ); | |
472 | ||
473 | // count the number of chambers in station 4 & 5 that contain cluster(s) | |
474 | if (currentCh > 5 && currentCh != previousCh) { | |
475 | nChHitInSt45++; | |
476 | previousCh = currentCh; | |
477 | } | |
478 | ||
7332f213 | 479 | } |
480 | ||
3d7acbb7 | 481 | return (((requestedStationMask & presentStationMask) == requestedStationMask) && (nChHitInSt45 >= 2)); |
7332f213 | 482 | } |
483 | ||
484 | //__________________________________________________________________________ | |
a0dc65b4 | 485 | void AliMUONTrack::TagRemovableClusters(UInt_t requestedStationMask) { |
7332f213 | 486 | /// Identify clusters that can be removed from the track, |
3d7acbb7 | 487 | /// with the only requirements to have at least 1 cluster per requested station |
488 | /// and at least 2 chambers over 4 in stations 4 & 5 that contain cluster(s) | |
7332f213 | 489 | |
490 | Int_t nClusters = GetNClusters(); | |
491 | AliMUONTrackParam *trackParam, *nextTrackParam; | |
3d7acbb7 | 492 | Int_t currentCh, nextCh, currentSt, nextSt, previousCh = -1, nChHitInSt45 = 0; |
7332f213 | 493 | |
3d7acbb7 | 494 | // first loop over clusters |
7332f213 | 495 | for (Int_t i = 0; i < nClusters; i++) { |
496 | trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i); | |
3d7acbb7 | 497 | |
498 | currentCh = trackParam->GetClusterPtr()->GetChamberId(); | |
499 | currentSt = currentCh/2; | |
500 | ||
501 | // reset flags to kFALSE for all clusters in required station | |
502 | if ((1 << currentSt) & requestedStationMask) trackParam->SetRemovable(kFALSE); | |
9bf6860b | 503 | else trackParam->SetRemovable(kTRUE); |
3d7acbb7 | 504 | |
505 | // count the number of chambers in station 4 & 5 that contain cluster(s) | |
506 | if (currentCh > 5 && currentCh != previousCh) { | |
507 | nChHitInSt45++; | |
508 | previousCh = currentCh; | |
509 | } | |
510 | ||
7332f213 | 511 | } |
512 | ||
3d7acbb7 | 513 | // second loop over clusters |
7332f213 | 514 | for (Int_t i = 0; i < nClusters; i++) { |
515 | trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i); | |
516 | ||
517 | currentCh = trackParam->GetClusterPtr()->GetChamberId(); | |
3d7acbb7 | 518 | currentSt = currentCh/2; |
7332f213 | 519 | |
3d7acbb7 | 520 | // make sure they are more than 2 clusters in 2 different chambers of stations 4 & 5 |
521 | // but 2 clusters in he same chamber will still be flagged as removable | |
522 | if (nChHitInSt45 < 3 && currentSt > 2) { | |
7332f213 | 523 | |
3d7acbb7 | 524 | if (i == nClusters-1) { |
525 | ||
526 | trackParam->SetRemovable(kFALSE); | |
7332f213 | 527 | |
3d7acbb7 | 528 | } else { |
529 | ||
530 | nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i+1); | |
531 | nextCh = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
532 | ||
533 | // set clusters in the same chamber as being removable | |
534 | if (nextCh == currentCh) { | |
535 | trackParam->SetRemovable(kTRUE); | |
536 | nextTrackParam->SetRemovable(kTRUE); | |
537 | i++; // skip cluster already checked | |
538 | } else { | |
539 | trackParam->SetRemovable(kFALSE); | |
540 | } | |
541 | ||
542 | } | |
7332f213 | 543 | |
3d7acbb7 | 544 | } else { |
545 | ||
546 | // skip clusters already flag as removable | |
547 | if (trackParam->IsRemovable()) continue; | |
548 | ||
549 | // loop over next track parameters | |
550 | for (Int_t j = i+1; j < nClusters; j++) { | |
551 | nextTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(j); | |
552 | ||
553 | nextCh = nextTrackParam->GetClusterPtr()->GetChamberId(); | |
554 | nextSt = nextCh/2; | |
555 | ||
556 | // set clusters in the same station as being removable | |
557 | if (nextSt == currentSt) { | |
558 | trackParam->SetRemovable(kTRUE); | |
559 | nextTrackParam->SetRemovable(kTRUE); | |
560 | i++; // skip cluster already checked | |
561 | } | |
562 | ||
563 | } | |
7332f213 | 564 | |
565 | } | |
3d7acbb7 | 566 | |
7332f213 | 567 | } |
568 | ||
208f139e | 569 | } |
570 | ||
ea94c18b | 571 | //__________________________________________________________________________ |
572 | Bool_t AliMUONTrack::ComputeLocalChi2(Bool_t accountForMCS) | |
573 | { | |
96ebe67e | 574 | /// Compute each cluster contribution to the chi2 of the track |
ea94c18b | 575 | /// accounting for multiple scattering or not according to the flag |
96ebe67e | 576 | /// - Also recompute the weight matrices of the attached clusters if accountForMCS=kTRUE |
577 | /// - Assume that track parameters at each cluster are corrects | |
ea94c18b | 578 | /// - Return kFALSE if computation failed |
7332f213 | 579 | AliDebug(1,"Enter ComputeLocalChi2"); |
580 | ||
581 | if (!fTrackParamAtCluster) { | |
582 | AliWarning("no cluster attached to this track"); | |
583 | return kFALSE; | |
584 | } | |
ea94c18b | 585 | |
ea94c18b | 586 | if (accountForMCS) { // Compute local chi2 taking into account multiple scattering effects |
587 | ||
588 | // Compute MCS covariance matrix only once | |
96ebe67e | 589 | Int_t nClusters = GetNClusters(); |
590 | TMatrixD mcsCovariances(nClusters,nClusters); | |
ea94c18b | 591 | ComputeMCSCovariances(mcsCovariances); |
592 | ||
96ebe67e | 593 | // Make sure cluster weights are consistent with following calculations |
594 | if (!ComputeClusterWeights(&mcsCovariances)) { | |
ea94c18b | 595 | AliWarning("cannot take into account the multiple scattering effects"); |
596 | return ComputeLocalChi2(kFALSE); | |
597 | } | |
598 | ||
599 | // Compute chi2 of the track | |
600 | Double_t globalChi2 = ComputeGlobalChi2(kTRUE); | |
601 | if (globalChi2 < 0.) return kFALSE; | |
602 | ||
96ebe67e | 603 | // Loop over removable clusters and compute their local chi2 |
604 | AliMUONTrackParam* trackParamAtCluster1; | |
605 | AliMUONVCluster *cluster, *discardedCluster; | |
606 | Int_t iCluster1, iCluster2, iCurrentCluster1, iCurrentCluster2; | |
c812dd48 | 607 | TMatrixD clusterWeightsNB(nClusters-1,nClusters-1); |
608 | TMatrixD clusterWeightsB(nClusters-1,nClusters-1); | |
96ebe67e | 609 | Double_t *dX = new Double_t[nClusters-1]; |
610 | Double_t *dY = new Double_t[nClusters-1]; | |
ea94c18b | 611 | Double_t globalChi2b; |
96ebe67e | 612 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
613 | while (trackParamAtCluster) { | |
ea94c18b | 614 | |
96ebe67e | 615 | discardedCluster = trackParamAtCluster->GetClusterPtr(); |
ea94c18b | 616 | |
96ebe67e | 617 | // Recompute cluster weights without the current cluster |
c812dd48 | 618 | if (!ComputeClusterWeights(clusterWeightsNB, clusterWeightsB, &mcsCovariances, discardedCluster)) { |
ea94c18b | 619 | AliWarning("cannot take into account the multiple scattering effects"); |
96ebe67e | 620 | delete [] dX; |
621 | delete [] dY; | |
622 | return ComputeLocalChi2(kFALSE); | |
ea94c18b | 623 | } |
624 | ||
96ebe67e | 625 | // Compute track chi2 without the current cluster |
ea94c18b | 626 | globalChi2b = 0.; |
96ebe67e | 627 | iCurrentCluster1 = 0; |
628 | for (iCluster1 = 0; iCluster1 < nClusters ; iCluster1++) { | |
629 | trackParamAtCluster1 = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1); | |
630 | cluster = trackParamAtCluster1->GetClusterPtr(); | |
ea94c18b | 631 | |
96ebe67e | 632 | if (cluster == discardedCluster) continue; |
ea94c18b | 633 | |
634 | // Compute and save residuals | |
96ebe67e | 635 | dX[iCurrentCluster1] = cluster->GetX() - trackParamAtCluster1->GetNonBendingCoor(); |
636 | dY[iCurrentCluster1] = cluster->GetY() - trackParamAtCluster1->GetBendingCoor(); | |
ea94c18b | 637 | |
96ebe67e | 638 | iCurrentCluster2 = 0; |
639 | for (iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) { | |
640 | cluster = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
ea94c18b | 641 | |
96ebe67e | 642 | if (cluster == discardedCluster) continue; |
ea94c18b | 643 | |
644 | // Add contribution from covariances | |
c812dd48 | 645 | globalChi2b += (clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) + |
646 | clusterWeightsNB(iCurrentCluster2, iCurrentCluster1)) * dX[iCurrentCluster1] * dX[iCurrentCluster2] + | |
647 | (clusterWeightsB(iCurrentCluster1, iCurrentCluster2) + | |
648 | clusterWeightsB(iCurrentCluster2, iCurrentCluster1)) * dY[iCurrentCluster1] * dY[iCurrentCluster2]; | |
ea94c18b | 649 | |
96ebe67e | 650 | iCurrentCluster2++; |
ea94c18b | 651 | } |
652 | ||
653 | // Add contribution from variances | |
c812dd48 | 654 | globalChi2b += clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) * dX[iCurrentCluster1] * dX[iCurrentCluster1] + |
655 | clusterWeightsB(iCurrentCluster1, iCurrentCluster1) * dY[iCurrentCluster1] * dY[iCurrentCluster1]; | |
ea94c18b | 656 | |
96ebe67e | 657 | iCurrentCluster1++; |
ea94c18b | 658 | } |
659 | ||
660 | // Set local chi2 | |
96ebe67e | 661 | trackParamAtCluster->SetLocalChi2(globalChi2 - globalChi2b); |
ea94c18b | 662 | |
96ebe67e | 663 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(trackParamAtCluster); |
ea94c18b | 664 | } |
665 | ||
666 | delete [] dX; | |
667 | delete [] dY; | |
668 | ||
669 | } else { // without multiple scattering effects | |
670 | ||
96ebe67e | 671 | AliMUONVCluster *discardedCluster; |
ea94c18b | 672 | Double_t dX, dY; |
96ebe67e | 673 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
674 | while (trackParamAtCluster) { | |
ea94c18b | 675 | |
96ebe67e | 676 | discardedCluster = trackParamAtCluster->GetClusterPtr(); |
ea94c18b | 677 | |
678 | // Compute residuals | |
96ebe67e | 679 | dX = discardedCluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); |
680 | dY = discardedCluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
ea94c18b | 681 | |
682 | // Set local chi2 | |
96ebe67e | 683 | trackParamAtCluster->SetLocalChi2(dX * dX / discardedCluster->GetErrX2() + dY * dY / discardedCluster->GetErrY2()); |
ea94c18b | 684 | |
96ebe67e | 685 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(trackParamAtCluster); |
ea94c18b | 686 | } |
687 | ||
688 | } | |
689 | ||
ea94c18b | 690 | return kTRUE; |
691 | ||
692 | } | |
693 | ||
694 | //__________________________________________________________________________ | |
695 | Double_t AliMUONTrack::ComputeGlobalChi2(Bool_t accountForMCS) | |
696 | { | |
697 | /// Compute the chi2 of the track accounting for multiple scattering or not according to the flag | |
96ebe67e | 698 | /// - Assume that track parameters at each cluster are corrects |
699 | /// - Assume the cluster weights matrices are corrects | |
ea94c18b | 700 | /// - Return negative value if chi2 computation failed |
7332f213 | 701 | AliDebug(1,"Enter ComputeGlobalChi2"); |
702 | ||
703 | if (!fTrackParamAtCluster) { | |
704 | AliWarning("no cluster attached to this track"); | |
705 | return 1.e10; | |
706 | } | |
ea94c18b | 707 | |
ea94c18b | 708 | Double_t chi2 = 0.; |
709 | ||
710 | if (accountForMCS) { | |
711 | ||
b709ac13 | 712 | // Check the weight matrices. If weight matrices are not available compute chi2 without MCS |
96ebe67e | 713 | if (!fClusterWeightsNonBending || !fClusterWeightsBending) { |
714 | AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering"); | |
b709ac13 | 715 | return ComputeGlobalChi2(kFALSE); |
716 | } | |
96ebe67e | 717 | Int_t nClusters = GetNClusters(); |
718 | if (fClusterWeightsNonBending->GetNrows() != nClusters || fClusterWeightsBending->GetNcols() != nClusters) { | |
719 | AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering"); | |
ea94c18b | 720 | return ComputeGlobalChi2(kFALSE); |
721 | } | |
722 | ||
723 | // Compute chi2 | |
96ebe67e | 724 | AliMUONVCluster *cluster; |
725 | Double_t *dX = new Double_t[nClusters]; | |
726 | Double_t *dY = new Double_t[nClusters]; | |
727 | AliMUONTrackParam* trackParamAtCluster; | |
728 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
729 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1); | |
730 | cluster = trackParamAtCluster->GetClusterPtr(); | |
731 | dX[iCluster1] = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
732 | dY[iCluster1] = cluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
733 | for (Int_t iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) { | |
734 | chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster2) + (*fClusterWeightsNonBending)(iCluster2, iCluster1)) * dX[iCluster1] * dX[iCluster2] + | |
735 | ((*fClusterWeightsBending)(iCluster1, iCluster2) + (*fClusterWeightsBending)(iCluster2, iCluster1)) * dY[iCluster1] * dY[iCluster2]; | |
ea94c18b | 736 | } |
96ebe67e | 737 | chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster1) * dX[iCluster1] * dX[iCluster1]) + |
738 | ((*fClusterWeightsBending)(iCluster1, iCluster1) * dY[iCluster1] * dY[iCluster1]); | |
ea94c18b | 739 | } |
740 | delete [] dX; | |
741 | delete [] dY; | |
742 | ||
743 | } else { | |
744 | ||
96ebe67e | 745 | AliMUONVCluster *cluster; |
ea94c18b | 746 | Double_t dX, dY; |
96ebe67e | 747 | AliMUONTrackParam* trackParamAtCluster; |
748 | Int_t nClusters = GetNClusters(); | |
749 | for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) { | |
750 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster); | |
751 | cluster = trackParamAtCluster->GetClusterPtr(); | |
752 | dX = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
753 | dY = cluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
754 | chi2 += dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2(); | |
ea94c18b | 755 | } |
756 | ||
757 | } | |
758 | ||
759 | return chi2; | |
760 | ||
761 | } | |
762 | ||
763 | //__________________________________________________________________________ | |
96ebe67e | 764 | Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD* mcsCovariances) |
ea94c18b | 765 | { |
96ebe67e | 766 | /// Compute the weight matrices of the attached clusters, in non bending and bending direction, |
767 | /// accounting for multiple scattering correlations and cluster resolution | |
ea94c18b | 768 | /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily) |
96ebe67e | 769 | /// - Assume that track parameters at each cluster are corrects |
ea94c18b | 770 | /// - Return kFALSE if computation failed |
7332f213 | 771 | AliDebug(1,"Enter ComputeClusterWeights1"); |
772 | ||
773 | if (!fTrackParamAtCluster) { | |
774 | AliWarning("no cluster attached to this track"); | |
775 | return kFALSE; | |
776 | } | |
ea94c18b | 777 | |
778 | // Alocate memory | |
96ebe67e | 779 | Int_t nClusters = GetNClusters(); |
780 | if (!fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(nClusters,nClusters); | |
781 | if (!fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(nClusters,nClusters); | |
ea94c18b | 782 | |
783 | // Compute weights matrices | |
96ebe67e | 784 | if (!ComputeClusterWeights(*fClusterWeightsNonBending, *fClusterWeightsBending, mcsCovariances)) return kFALSE; |
ea94c18b | 785 | |
786 | return kTRUE; | |
787 | ||
788 | } | |
789 | ||
790 | //__________________________________________________________________________ | |
c812dd48 | 791 | Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD& clusterWeightsNB, TMatrixD& clusterWeightsB, |
96ebe67e | 792 | TMatrixD* mcsCovariances, AliMUONVCluster* discardedCluster) const |
ea94c18b | 793 | { |
794 | /// Compute the weight matrices, in non bending and bending direction, | |
96ebe67e | 795 | /// of the other attached clusters assuming the discarded one does not exist |
796 | /// accounting for multiple scattering correlations and cluster resolution | |
ea94c18b | 797 | /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily) |
798 | /// - Return kFALSE if computation failed | |
7332f213 | 799 | AliDebug(1,"Enter ComputeClusterWeights2"); |
ea94c18b | 800 | |
801 | // Check MCS covariance matrix and recompute it if need | |
96ebe67e | 802 | Int_t nClusters = GetNClusters(); |
ea94c18b | 803 | Bool_t deleteMCSCov = kFALSE; |
804 | if (!mcsCovariances) { | |
96ebe67e | 805 | mcsCovariances = new TMatrixD(nClusters,nClusters); |
ea94c18b | 806 | deleteMCSCov = kTRUE; |
807 | ComputeMCSCovariances(*mcsCovariances); | |
ea94c18b | 808 | } |
809 | ||
810 | // Resize the weights matrices; alocate memory | |
96ebe67e | 811 | if (discardedCluster) { |
c812dd48 | 812 | clusterWeightsNB.ResizeTo(nClusters-1,nClusters-1); |
813 | clusterWeightsB.ResizeTo(nClusters-1,nClusters-1); | |
ea94c18b | 814 | } else { |
c812dd48 | 815 | clusterWeightsNB.ResizeTo(nClusters,nClusters); |
816 | clusterWeightsB.ResizeTo(nClusters,nClusters); | |
ea94c18b | 817 | } |
818 | ||
819 | // Define variables | |
96ebe67e | 820 | AliMUONVCluster *cluster1, *cluster2; |
821 | Int_t iCurrentCluster1, iCurrentCluster2; | |
ea94c18b | 822 | |
823 | // Compute the covariance matrices | |
96ebe67e | 824 | iCurrentCluster1 = 0; |
825 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
826 | cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr(); | |
ea94c18b | 827 | |
96ebe67e | 828 | if (cluster1 == discardedCluster) continue; |
ea94c18b | 829 | |
96ebe67e | 830 | // Loop over next clusters |
831 | iCurrentCluster2 = iCurrentCluster1; | |
832 | for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) { | |
833 | cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
ea94c18b | 834 | |
96ebe67e | 835 | if (cluster2 == discardedCluster) continue; |
ea94c18b | 836 | |
ea94c18b | 837 | // Fill with MCS covariances |
c812dd48 | 838 | clusterWeightsNB(iCurrentCluster1, iCurrentCluster2) = (*mcsCovariances)(iCluster1,iCluster2); |
ea94c18b | 839 | |
840 | // Equal contribution from multiple scattering in non bending and bending directions | |
c812dd48 | 841 | clusterWeightsB(iCurrentCluster1, iCurrentCluster2) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2); |
ea94c18b | 842 | |
96ebe67e | 843 | // Add contribution from cluster resolution to diagonal element and symmetrize the matrix |
844 | if (iCurrentCluster1 == iCurrentCluster2) { | |
ea94c18b | 845 | |
846 | // In non bending plane | |
c812dd48 | 847 | clusterWeightsNB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrX2(); |
ea94c18b | 848 | // In bending plane |
c812dd48 | 849 | clusterWeightsB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrY2(); |
ea94c18b | 850 | |
851 | } else { | |
852 | ||
853 | // In non bending plane | |
c812dd48 | 854 | clusterWeightsNB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsNB(iCurrentCluster1, iCurrentCluster2); |
ea94c18b | 855 | // In bending plane |
c812dd48 | 856 | clusterWeightsB(iCurrentCluster2, iCurrentCluster1) = clusterWeightsB(iCurrentCluster1, iCurrentCluster2); |
ea94c18b | 857 | |
858 | } | |
859 | ||
96ebe67e | 860 | iCurrentCluster2++; |
ea94c18b | 861 | } |
862 | ||
96ebe67e | 863 | iCurrentCluster1++; |
ea94c18b | 864 | } |
865 | ||
866 | // Inversion of covariance matrices to get the weights | |
c812dd48 | 867 | if (clusterWeightsNB.Determinant() != 0 && clusterWeightsB.Determinant() != 0) { |
868 | clusterWeightsNB.Invert(); | |
869 | clusterWeightsB.Invert(); | |
ea94c18b | 870 | } else { |
871 | AliWarning(" Determinant = 0"); | |
c812dd48 | 872 | clusterWeightsNB.ResizeTo(0,0); |
873 | clusterWeightsB.ResizeTo(0,0); | |
ea94c18b | 874 | if(deleteMCSCov) delete mcsCovariances; |
875 | return kFALSE; | |
876 | } | |
877 | ||
878 | if(deleteMCSCov) delete mcsCovariances; | |
879 | ||
880 | return kTRUE; | |
881 | ||
882 | } | |
883 | ||
884 | //__________________________________________________________________________ | |
885 | void AliMUONTrack::ComputeMCSCovariances(TMatrixD& mcsCovariances) const | |
886 | { | |
887 | /// Compute the multiple scattering covariance matrix | |
96ebe67e | 888 | /// (assume that track parameters at each cluster are corrects) |
7332f213 | 889 | AliDebug(1,"Enter ComputeMCSCovariances"); |
ea94c18b | 890 | |
b709ac13 | 891 | // Reset the size of the covariance matrix if needed |
96ebe67e | 892 | Int_t nClusters = GetNClusters(); |
893 | if (mcsCovariances.GetNrows() != nClusters) mcsCovariances.ResizeTo(nClusters,nClusters); | |
ea94c18b | 894 | |
895 | // Define variables | |
b709ac13 | 896 | Int_t nChambers = AliMUONConstants::NTrackingCh(); |
96ebe67e | 897 | AliMUONTrackParam* trackParamAtCluster; |
ea94c18b | 898 | AliMUONTrackParam extrapTrackParam; |
b709ac13 | 899 | Int_t currentChamber = 0, expectedChamber = 0, size = 0; |
900 | Double_t *mcsAngle2 = new Double_t[2*nChambers]; | |
901 | Double_t *zMCS = new Double_t[2*nChambers]; | |
96ebe67e | 902 | Int_t *indices = new Int_t[2*nClusters]; |
ea94c18b | 903 | |
904 | // Compute multiple scattering dispersion angle at each chamber | |
905 | // and save the z position where it is calculated | |
96ebe67e | 906 | for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) { |
907 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster); | |
ea94c18b | 908 | |
909 | // look for missing chambers if any | |
96ebe67e | 910 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); |
ea94c18b | 911 | while (currentChamber > expectedChamber) { |
912 | ||
913 | // Save the z position where MCS dispersion is calculated | |
b709ac13 | 914 | zMCS[size] = AliMUONConstants::DefaultChamberZ(expectedChamber); |
ea94c18b | 915 | |
96ebe67e | 916 | // Do not take into account MCS in chambers prior the first cluster |
917 | if (iCluster > 0) { | |
ea94c18b | 918 | |
919 | // Get track parameters at missing chamber z | |
96ebe67e | 920 | extrapTrackParam = *trackParamAtCluster; |
921 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, zMCS[size]); | |
ea94c18b | 922 | |
923 | // Save multiple scattering dispersion angle in missing chamber | |
b709ac13 | 924 | mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(),1.); |
ea94c18b | 925 | |
b709ac13 | 926 | } else mcsAngle2[size] = 0.; |
ea94c18b | 927 | |
928 | expectedChamber++; | |
b709ac13 | 929 | size++; |
ea94c18b | 930 | } |
931 | ||
932 | // Save z position where MCS dispersion is calculated | |
96ebe67e | 933 | zMCS[size] = trackParamAtCluster->GetZ(); |
ea94c18b | 934 | |
935 | // Save multiple scattering dispersion angle in current chamber | |
96ebe67e | 936 | mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(*trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.); |
b709ac13 | 937 | |
938 | // Save indice in zMCS array corresponding to the current cluster | |
96ebe67e | 939 | indices[iCluster] = size; |
ea94c18b | 940 | |
b709ac13 | 941 | expectedChamber = currentChamber + 1; |
942 | size++; | |
ea94c18b | 943 | } |
944 | ||
96ebe67e | 945 | // complete array of z if last cluster is on the last but one chamber |
b709ac13 | 946 | if (currentChamber != nChambers-1) zMCS[size++] = AliMUONConstants::DefaultChamberZ(nChambers-1); |
ea94c18b | 947 | |
948 | // Compute the covariance matrix | |
96ebe67e | 949 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { |
ea94c18b | 950 | |
96ebe67e | 951 | for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) { |
ea94c18b | 952 | |
953 | // Initialization to 0 (diagonal plus upper triangular part) | |
96ebe67e | 954 | mcsCovariances(iCluster1,iCluster2) = 0.; |
ea94c18b | 955 | |
956 | // Compute contribution from multiple scattering in upstream chambers | |
96ebe67e | 957 | for (Int_t k = 0; k < indices[iCluster1]; k++) { |
958 | mcsCovariances(iCluster1,iCluster2) += (zMCS[indices[iCluster1]] - zMCS[k]) * (zMCS[indices[iCluster2]] - zMCS[k]) * mcsAngle2[k]; | |
ea94c18b | 959 | } |
960 | ||
961 | // Symetrize the matrix | |
96ebe67e | 962 | mcsCovariances(iCluster2,iCluster1) = mcsCovariances(iCluster1,iCluster2); |
ea94c18b | 963 | } |
964 | ||
965 | } | |
966 | ||
967 | delete [] mcsAngle2; | |
968 | delete [] zMCS; | |
b709ac13 | 969 | delete [] indices; |
ea94c18b | 970 | |
971 | } | |
972 | ||
208f139e | 973 | //__________________________________________________________________________ |
c59f70b9 | 974 | Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track, Bool_t inSt345) const |
208f139e | 975 | { |
96ebe67e | 976 | /// Returns the number of clusters in common between the current track ("this") |
208f139e | 977 | /// and the track pointed to by "track". |
c59f70b9 | 978 | /// If inSt345=kTRUE only stations 3, 4 and 5 are considered. |
7332f213 | 979 | if (!fTrackParamAtCluster || !this->fTrackParamAtCluster) return 0; |
96ebe67e | 980 | Int_t clustersInCommon = 0; |
981 | AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2; | |
982 | // Loop over clusters of first track | |
983 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->First(); | |
984 | while (trackParamAtCluster1) { | |
c59f70b9 | 985 | if ((!inSt345) || (trackParamAtCluster1->GetClusterPtr()->GetChamberId() > 3)) { |
986 | // Loop over clusters of second track | |
987 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->First(); | |
988 | while (trackParamAtCluster2) { | |
989 | if ((!inSt345) || (trackParamAtCluster2->GetClusterPtr()->GetChamberId() > 3)) { | |
990 | // Increment "clustersInCommon" if both trackParamAtCluster1 & 2 point to the same cluster | |
991 | if ((trackParamAtCluster1->GetClusterPtr()) == (trackParamAtCluster2->GetClusterPtr())) { | |
992 | clustersInCommon++; | |
993 | break; | |
994 | } | |
995 | } | |
996 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->After(trackParamAtCluster2); | |
997 | } // trackParamAtCluster2 | |
998 | } | |
96ebe67e | 999 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->After(trackParamAtCluster1); |
1000 | } // trackParamAtCluster1 | |
1001 | return clustersInCommon; | |
208f139e | 1002 | } |
1003 | ||
5a240757 | 1004 | //__________________________________________________________________________ |
1005 | Int_t AliMUONTrack::GetNDF() const | |
1006 | { | |
1007 | /// return the number of degrees of freedom | |
1008 | ||
1009 | Int_t ndf = 2 * GetNClusters() - 5; | |
1010 | return (ndf > 0) ? ndf : 0; | |
1011 | } | |
1012 | ||
ea94c18b | 1013 | //__________________________________________________________________________ |
1014 | Double_t AliMUONTrack::GetNormalizedChi2() const | |
1015 | { | |
5a240757 | 1016 | /// return the chi2 value divided by the number of degrees of freedom (or FLT_MAX if ndf <= 0) |
ea94c18b | 1017 | |
5a240757 | 1018 | Double_t ndf = (Double_t) GetNDF(); |
1019 | return (ndf > 0.) ? fGlobalChi2 / ndf : FLT_MAX; | |
ea94c18b | 1020 | } |
1021 | ||
208f139e | 1022 | //__________________________________________________________________________ |
c59f70b9 | 1023 | Int_t AliMUONTrack::CompatibleTrack(AliMUONTrack* track, Double_t sigmaCut, Bool_t compatibleCluster[10]) const |
b8dc484b | 1024 | { |
c59f70b9 | 1025 | /// for each chamber: return kTRUE (kFALSE) if clusters are compatible (not compatible). |
1026 | /// nMatchClusters = number of clusters of "this" track matched with one cluster of track "track" | |
96ebe67e | 1027 | AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2; |
1028 | AliMUONVCluster *cluster1, *cluster2; | |
c59f70b9 | 1029 | Double_t chi2, dX, dY; |
61fed964 | 1030 | Double_t chi2Max = sigmaCut * sigmaCut; |
96ebe67e | 1031 | |
c59f70b9 | 1032 | // initialization |
1033 | Int_t nMatchClusters = 0; | |
96ebe67e | 1034 | for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) compatibleCluster[ch] = kFALSE; |
b8dc484b | 1035 | |
c59f70b9 | 1036 | if (!fTrackParamAtCluster || !this->fTrackParamAtCluster) return nMatchClusters; |
7332f213 | 1037 | |
96ebe67e | 1038 | // Loop over clusters of first track |
1039 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->First(); | |
1040 | while (trackParamAtCluster1) { | |
1041 | ||
1042 | cluster1 = trackParamAtCluster1->GetClusterPtr(); | |
1043 | ||
1044 | // Loop over clusters of second track | |
1045 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->First(); | |
1046 | while (trackParamAtCluster2) { | |
1047 | ||
1048 | cluster2 = trackParamAtCluster2->GetClusterPtr(); | |
1049 | ||
1050 | //prepare next step | |
1051 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->After(trackParamAtCluster2); | |
1052 | ||
c59f70b9 | 1053 | // check DE Id |
1054 | if (cluster1->GetDetElemId() != cluster2->GetDetElemId()) continue; | |
96ebe67e | 1055 | |
2e2d0c44 | 1056 | // check local chi2 |
96ebe67e | 1057 | dX = cluster1->GetX() - cluster2->GetX(); |
96ebe67e | 1058 | dY = cluster1->GetY() - cluster2->GetY(); |
2e2d0c44 | 1059 | chi2 = dX * dX / (cluster1->GetErrX2() + cluster2->GetErrX2()) + dY * dY / (cluster1->GetErrY2() + cluster2->GetErrY2()); |
1060 | if (chi2 > 2. * chi2Max) continue; // 2 because 2 quantities in chi2 | |
96ebe67e | 1061 | |
1062 | compatibleCluster[cluster1->GetChamberId()] = kTRUE; | |
c59f70b9 | 1063 | nMatchClusters++; |
96ebe67e | 1064 | break; |
1065 | } | |
1066 | ||
1067 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->After(trackParamAtCluster1); | |
b8dc484b | 1068 | } |
1069 | ||
c59f70b9 | 1070 | return nMatchClusters; |
8429a5e4 | 1071 | } |
1072 | ||
96ebe67e | 1073 | //__________________________________________________________________________ |
1074 | void AliMUONTrack::SetTrackParamAtVertex(const AliMUONTrackParam* trackParam) | |
1075 | { | |
1076 | /// set track parameters at vertex | |
1077 | if (trackParam == 0x0) return; | |
1078 | if (fTrackParamAtVertex) *fTrackParamAtVertex = *trackParam; | |
1079 | else fTrackParamAtVertex = new AliMUONTrackParam(*trackParam); | |
1080 | } | |
1081 | ||
1082 | //__________________________________________________________________________ | |
1083 | void AliMUONTrack::RecursiveDump() const | |
a9e2aefa | 1084 | { |
96ebe67e | 1085 | /// Recursive dump of AliMUONTrack, i.e. with dump of trackParamAtCluster and attached clusters |
1086 | AliMUONTrackParam *trackParamAtCluster; | |
1087 | AliMUONVCluster *cluster; | |
de2cd600 | 1088 | cout << "Recursive dump of Track: " << this << endl; |
1089 | // Track | |
1090 | this->Dump(); | |
96ebe67e | 1091 | for (Int_t iCluster = 0; iCluster < GetNClusters(); iCluster++) { |
1092 | trackParamAtCluster = (AliMUONTrackParam*) ((*fTrackParamAtCluster)[iCluster]); | |
1093 | // trackParamAtCluster | |
1094 | cout << "trackParamAtCluster: " << trackParamAtCluster << " (index: " << iCluster << ")" << endl; | |
1095 | trackParamAtCluster->Dump(); | |
1096 | cluster = trackParamAtCluster->GetClusterPtr(); | |
1097 | // cluster | |
1098 | cout << "cluster: " << cluster << endl; | |
1099 | cluster->Print(); | |
a9e2aefa | 1100 | } |
de2cd600 | 1101 | return; |
a9e2aefa | 1102 | } |
04b5ea16 | 1103 | |
6464217e | 1104 | //_____________________________________________- |
d2b1e7bb | 1105 | void AliMUONTrack::Print(Option_t*) const |
6464217e | 1106 | { |
2457f726 | 1107 | /// Printing Track information |
d2b1e7bb | 1108 | |
96ebe67e | 1109 | cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNClusters() << |
6464217e | 1110 | ", Match2Trig=" << setw(1) << GetMatchTrigger() << |
c6ba19f7 | 1111 | ", LoTrgNum=" << setw(3) << GetLoTrgNum() << |
d2b1e7bb | 1112 | ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger(); |
2e2d0c44 | 1113 | cout << Form(" HitTriggerPattern %x",fHitsPatternInTrigCh); |
1114 | cout << Form(" MClabel=%d",fTrackID) << endl; | |
7332f213 | 1115 | if (fTrackParamAtCluster) fTrackParamAtCluster->First()->Print("FULL"); |
6464217e | 1116 | } |
423b32ca | 1117 | |
1118 | //__________________________________________________________________________ | |
1119 | void AliMUONTrack::SetLocalTrigger(Int_t loCirc, Int_t loStripX, Int_t loStripY, Int_t loDev, Int_t loLpt, Int_t loHpt) | |
1120 | { | |
1121 | /// pack the local trigger information and store | |
1122 | ||
01413742 | 1123 | if (loCirc < 0) return; |
423b32ca | 1124 | |
1125 | fLocalTrigger = 0; | |
1126 | fLocalTrigger += loCirc; | |
1127 | fLocalTrigger += loStripX << 8; | |
1128 | fLocalTrigger += loStripY << 13; | |
1129 | fLocalTrigger += loDev << 17; | |
1130 | fLocalTrigger += loLpt << 22; | |
1131 | fLocalTrigger += loHpt << 24; | |
1132 | ||
1133 | } | |
1134 | ||
2e2d0c44 | 1135 | //__________________________________________________________________________ |
1136 | void AliMUONTrack::FindMCLabel() | |
1137 | { | |
1138 | /// Determine the MC label from the label of the attached clusters and fill fMCLabel data member: | |
1139 | /// More than 50% of clusters, including 1 before and 1 after the dipole, must share the same label | |
1140 | ||
1141 | Int_t nClusters = GetNClusters(); | |
1142 | Int_t halfCluster = nClusters/2; | |
1143 | ||
1144 | // reset MC label | |
1145 | fTrackID = -1; | |
1146 | ||
1147 | // loop over first clusters (if nClusters left < (nClusters-halfCluster) the conditions cannot be fulfilled) | |
1148 | for (Int_t iCluster1 = 0; iCluster1 < nClusters-halfCluster; iCluster1++) { | |
1149 | AliMUONVCluster* cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr(); | |
1150 | ||
1151 | // if the first cluster is not on station 1 or 2 the conditions cannot be fulfilled | |
1152 | if (cluster1->GetChamberId() > 3) return; | |
1153 | ||
1154 | Int_t label1 = cluster1->GetMCLabel(); | |
1155 | if (label1 < 0) continue; | |
1156 | ||
1157 | Int_t nIdenticalLabel = 1; | |
1158 | ||
1159 | // Loop over next clusters | |
1160 | for (Int_t iCluster2 = iCluster1+1; iCluster2 < nClusters; iCluster2++) { | |
1161 | AliMUONVCluster* cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
1162 | ||
1163 | if (cluster2->GetMCLabel() != label1) continue; | |
1164 | ||
1165 | nIdenticalLabel++; | |
1166 | ||
1167 | // stop as soon as conditions are fulfilled | |
1168 | if (nIdenticalLabel > halfCluster && cluster2->GetChamberId() > 5) { | |
1169 | fTrackID = label1; | |
1170 | return; | |
1171 | } | |
1172 | ||
1173 | } | |
1174 | ||
1175 | } | |
1176 | ||
1177 | } | |
1178 |