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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 | |
de2cd600 | 26 | #include "AliMUONTrackParam.h" |
96ebe67e | 27 | #include "AliMUONVCluster.h" |
ea94c18b | 28 | #include "AliMUONObjectPair.h" |
d837040f | 29 | #include "AliMUONConstants.h" |
208f139e | 30 | #include "AliMUONTrackExtrap.h" |
a9e2aefa | 31 | |
63ed9c6b | 32 | #include "AliLog.h" |
33 | ||
63ed9c6b | 34 | #include <TMath.h> |
4889d34c | 35 | #include <TMatrixD.h> |
63ed9c6b | 36 | |
ea94c18b | 37 | #include <Riostream.h> |
38 | ||
7945aae7 | 39 | /// \cond CLASSIMP |
63ed9c6b | 40 | ClassImp(AliMUONTrack) // Class implementation in ROOT context |
7945aae7 | 41 | /// \endcond |
63ed9c6b | 42 | |
43 | //__________________________________________________________________________ | |
30178c30 | 44 | AliMUONTrack::AliMUONTrack() |
54d7ba50 | 45 | : TObject(), |
96ebe67e | 46 | fTrackParamAtCluster(new TClonesArray("AliMUONTrackParam",10)), |
208f139e | 47 | fFitWithVertex(kFALSE), |
96ebe67e | 48 | fVertexErrXY2(), |
ea94c18b | 49 | fFitWithMCS(kFALSE), |
96ebe67e | 50 | fClusterWeightsNonBending(0x0), |
51 | fClusterWeightsBending(0x0), | |
ea94c18b | 52 | fGlobalChi2(-1.), |
53 | fImproved(kFALSE), | |
7771752e | 54 | fMatchTrigger(-1), |
c6ba19f7 | 55 | floTrgNum(-1), |
54d7ba50 | 56 | fChi2MatchTrigger(0.), |
7771752e | 57 | fTrackID(0), |
96ebe67e | 58 | fTrackParamAtVertex(0x0), |
423b32ca | 59 | fHitsPatternInTrigCh(0), |
01413742 | 60 | fLocalTrigger(0) |
d837040f | 61 | { |
2457f726 | 62 | /// Default constructor |
96ebe67e | 63 | fTrackParamAtCluster->SetOwner(kTRUE); |
64 | fVertexErrXY2[0] = 0.; | |
65 | fVertexErrXY2[1] = 0.; | |
d837040f | 66 | } |
67 | ||
a9e2aefa | 68 | //__________________________________________________________________________ |
ea94c18b | 69 | AliMUONTrack::AliMUONTrack(AliMUONObjectPair *segment) |
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.), |
7771752e | 82 | fTrackID(0), |
96ebe67e | 83 | fTrackParamAtVertex(0x0), |
423b32ca | 84 | fHitsPatternInTrigCh(0), |
01413742 | 85 | fLocalTrigger(0) |
a9e2aefa | 86 | { |
96ebe67e | 87 | /// Constructor from two clusters |
88 | fTrackParamAtCluster->SetOwner(kTRUE); | |
de2cd600 | 89 | |
96ebe67e | 90 | fVertexErrXY2[0] = 0.; |
91 | fVertexErrXY2[1] = 0.; | |
208f139e | 92 | |
96ebe67e | 93 | // Pointers to clusters from the segment |
94 | AliMUONVCluster* cluster1 = (AliMUONVCluster*) segment->First(); | |
95 | AliMUONVCluster* cluster2 = (AliMUONVCluster*) segment->Second(); | |
208f139e | 96 | |
ea94c18b | 97 | // check sorting in -Z (spectro z<0) |
96ebe67e | 98 | if (cluster1->GetZ() < cluster2->GetZ()) { |
99 | cluster1 = cluster2; | |
100 | cluster2 = (AliMUONVCluster*) segment->First(); | |
ea94c18b | 101 | } |
102 | ||
96ebe67e | 103 | // order the clusters into the track according to the station the segment belong to |
104 | //(the cluster first attached is the one from which we will start the tracking procedure) | |
105 | AliMUONVCluster *firstCluster, *lastCluster; | |
106 | if (cluster1->GetChamberId() == 8) { | |
107 | firstCluster = cluster1; | |
108 | lastCluster = cluster2; | |
ea94c18b | 109 | } else { |
96ebe67e | 110 | firstCluster = cluster2; |
111 | lastCluster = cluster1; | |
ea94c18b | 112 | } |
208f139e | 113 | |
ea94c18b | 114 | // Compute track parameters |
96ebe67e | 115 | Double_t z1 = firstCluster->GetZ(); |
116 | Double_t z2 = lastCluster->GetZ(); | |
117 | Double_t dZ = z1 - z2; | |
208f139e | 118 | // Non bending plane |
96ebe67e | 119 | Double_t nonBendingCoor1 = firstCluster->GetX(); |
120 | Double_t nonBendingCoor2 = lastCluster->GetX(); | |
ea94c18b | 121 | Double_t nonBendingSlope = (nonBendingCoor1 - nonBendingCoor2) / dZ; |
208f139e | 122 | // Bending plane |
96ebe67e | 123 | Double_t bendingCoor1 = firstCluster->GetY(); |
124 | Double_t bendingCoor2 = lastCluster->GetY(); | |
ea94c18b | 125 | Double_t bendingSlope = (bendingCoor1 - bendingCoor2) / dZ; |
208f139e | 126 | // Inverse bending momentum |
96ebe67e | 127 | Double_t bendingImpact = bendingCoor1 - z1 * bendingSlope; |
208f139e | 128 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); |
ea94c18b | 129 | |
130 | ||
96ebe67e | 131 | // Set track parameters at first cluster |
132 | AliMUONTrackParam trackParamAtFirstCluster; | |
133 | trackParamAtFirstCluster.SetZ(z1); | |
134 | trackParamAtFirstCluster.SetNonBendingCoor(nonBendingCoor1); | |
135 | trackParamAtFirstCluster.SetNonBendingSlope(nonBendingSlope); | |
136 | trackParamAtFirstCluster.SetBendingCoor(bendingCoor1); | |
137 | trackParamAtFirstCluster.SetBendingSlope(bendingSlope); | |
138 | trackParamAtFirstCluster.SetInverseBendingMomentum(inverseBendingMomentum); | |
208f139e | 139 | |
ea94c18b | 140 | |
96ebe67e | 141 | // Set track parameters at last cluster |
142 | AliMUONTrackParam trackParamAtLastCluster; | |
143 | trackParamAtLastCluster.SetZ(z2); | |
144 | trackParamAtLastCluster.SetNonBendingCoor(nonBendingCoor2); | |
145 | trackParamAtLastCluster.SetNonBendingSlope(nonBendingSlope); | |
146 | trackParamAtLastCluster.SetBendingCoor(bendingCoor2); | |
147 | trackParamAtLastCluster.SetBendingSlope(bendingSlope); | |
148 | trackParamAtLastCluster.SetInverseBendingMomentum(inverseBendingMomentum); | |
ea94c18b | 149 | |
150 | ||
96ebe67e | 151 | // Compute and set track parameters covariances at first cluster |
ea94c18b | 152 | TMatrixD paramCov1(5,5); |
153 | paramCov1.Zero(); | |
208f139e | 154 | // Non bending plane |
96ebe67e | 155 | paramCov1(0,0) = firstCluster->GetErrX2(); |
156 | paramCov1(0,1) = firstCluster->GetErrX2() / dZ; | |
ea94c18b | 157 | paramCov1(1,0) = paramCov1(0,1); |
96ebe67e | 158 | paramCov1(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ; |
208f139e | 159 | // Bending plane |
96ebe67e | 160 | paramCov1(2,2) = firstCluster->GetErrY2(); |
161 | paramCov1(2,3) = firstCluster->GetErrY2() / dZ; | |
ea94c18b | 162 | paramCov1(3,2) = paramCov1(2,3); |
96ebe67e | 163 | paramCov1(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ; |
208f139e | 164 | // Inverse bending momentum (50% error) |
ea94c18b | 165 | paramCov1(4,4) = 0.5*inverseBendingMomentum * 0.5*inverseBendingMomentum; |
166 | // Set covariances | |
96ebe67e | 167 | trackParamAtFirstCluster.SetCovariances(paramCov1); |
ea94c18b | 168 | |
169 | ||
96ebe67e | 170 | // Compute and set track parameters covariances at last cluster (as if the first cluster did not exist) |
ea94c18b | 171 | TMatrixD paramCov2(5,5); |
172 | paramCov2.Zero(); | |
173 | // Non bending plane | |
174 | paramCov2(0,0) = paramCov1(0,0); | |
175 | paramCov2(1,1) = 100.*paramCov1(1,1); | |
176 | // Bending plane | |
177 | paramCov2(2,2) = paramCov1(2,2); | |
178 | paramCov2(3,3) = 100.*paramCov1(3,3); | |
179 | // Inverse bending momentum | |
180 | paramCov2(4,4) = paramCov1(4,4); | |
181 | // Set covariances | |
96ebe67e | 182 | trackParamAtLastCluster.SetCovariances(paramCov2); |
ea94c18b | 183 | |
96ebe67e | 184 | // Flag clusters as being removable |
185 | trackParamAtFirstCluster.SetRemovable(kTRUE); | |
186 | trackParamAtLastCluster.SetRemovable(kTRUE); | |
ea94c18b | 187 | |
96ebe67e | 188 | // Add track parameters at clusters |
189 | AddTrackParamAtCluster(trackParamAtFirstCluster,*firstCluster); | |
190 | AddTrackParamAtCluster(trackParamAtLastCluster,*lastCluster); | |
de2cd600 | 191 | |
a9e2aefa | 192 | } |
193 | ||
8429a5e4 | 194 | //__________________________________________________________________________ |
96ebe67e | 195 | AliMUONTrack::AliMUONTrack(const AliMUONTrack& track) |
ea94c18b | 196 | : TObject(track), |
96ebe67e | 197 | fTrackParamAtCluster(new TClonesArray("AliMUONTrackParam",10)), |
ea94c18b | 198 | fFitWithVertex(track.fFitWithVertex), |
96ebe67e | 199 | fVertexErrXY2(), |
ea94c18b | 200 | fFitWithMCS(track.fFitWithMCS), |
96ebe67e | 201 | fClusterWeightsNonBending(0x0), |
202 | fClusterWeightsBending(0x0), | |
ea94c18b | 203 | fGlobalChi2(track.fGlobalChi2), |
204 | fImproved(track.fImproved), | |
205 | fMatchTrigger(track.fMatchTrigger), | |
206 | floTrgNum(track.floTrgNum), | |
207 | fChi2MatchTrigger(track.fChi2MatchTrigger), | |
208 | fTrackID(track.fTrackID), | |
96ebe67e | 209 | fTrackParamAtVertex(0x0), |
ea94c18b | 210 | fHitsPatternInTrigCh(track.fHitsPatternInTrigCh), |
211 | fLocalTrigger(track.fLocalTrigger) | |
a9e2aefa | 212 | { |
2457f726 | 213 | ///copy constructor |
de2cd600 | 214 | |
e516b01d | 215 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
96ebe67e | 216 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->First(); |
217 | while (trackParamAtCluster) { | |
218 | new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(*trackParamAtCluster); | |
219 | trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster); | |
208f139e | 220 | } |
221 | ||
96ebe67e | 222 | // copy vertex resolution square used during the tracking procedure |
223 | fVertexErrXY2[0] = track.fVertexErrXY2[0]; | |
224 | fVertexErrXY2[1] = track.fVertexErrXY2[1]; | |
208f139e | 225 | |
96ebe67e | 226 | // copy cluster weights matrices if any |
227 | if (track.fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending)); | |
228 | if (track.fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending)); | |
ea94c18b | 229 | |
96ebe67e | 230 | // copy track parameters at vertex if any |
231 | if (track.fTrackParamAtVertex) fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex)); | |
208f139e | 232 | |
a9e2aefa | 233 | } |
234 | ||
956019b6 | 235 | //__________________________________________________________________________ |
ea94c18b | 236 | AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& track) |
a9e2aefa | 237 | { |
2457f726 | 238 | /// Asignment operator |
30178c30 | 239 | // check assignement to self |
ea94c18b | 240 | if (this == &track) |
a9e2aefa | 241 | return *this; |
61adb9bd | 242 | |
30178c30 | 243 | // base class assignement |
ea94c18b | 244 | TObject::operator=(track); |
30178c30 | 245 | |
e516b01d | 246 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
96ebe67e | 247 | fTrackParamAtCluster = new TClonesArray("AliMUONTrackParam",10); |
248 | AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->First(); | |
249 | while (trackParamAtCluster) { | |
250 | new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(*trackParamAtCluster); | |
251 | trackParamAtCluster = (AliMUONTrackParam*) track.fTrackParamAtCluster->After(trackParamAtCluster); | |
208f139e | 252 | } |
253 | ||
96ebe67e | 254 | // copy cluster weights matrix if any |
255 | if (track.fClusterWeightsNonBending) { | |
256 | if (fClusterWeightsNonBending) { | |
257 | fClusterWeightsNonBending->ResizeTo(*(track.fClusterWeightsNonBending)); | |
258 | *fClusterWeightsNonBending = *(track.fClusterWeightsNonBending); | |
259 | } else fClusterWeightsNonBending = new TMatrixD(*(track.fClusterWeightsNonBending)); | |
260 | } else if (fClusterWeightsNonBending) { | |
261 | delete fClusterWeightsNonBending; | |
262 | fClusterWeightsNonBending = 0x0; | |
208f139e | 263 | } |
264 | ||
96ebe67e | 265 | // copy cluster weights matrix if any |
266 | if (track.fClusterWeightsBending) { | |
267 | if (fClusterWeightsBending) { | |
268 | fClusterWeightsBending->ResizeTo(*(track.fClusterWeightsBending)); | |
269 | *fClusterWeightsBending = *(track.fClusterWeightsBending); | |
270 | } else fClusterWeightsBending = new TMatrixD(*(track.fClusterWeightsBending)); | |
271 | } else if (fClusterWeightsBending) { | |
272 | delete fClusterWeightsBending; | |
273 | fClusterWeightsBending = 0x0; | |
ea94c18b | 274 | } |
275 | ||
96ebe67e | 276 | // copy track parameters at vertex if any |
277 | if (track.fTrackParamAtVertex) { | |
278 | if (fTrackParamAtVertex) *fTrackParamAtVertex = *(track.fTrackParamAtVertex); | |
279 | else fTrackParamAtVertex = new AliMUONTrackParam(*(track.fTrackParamAtVertex)); | |
280 | } else if (fTrackParamAtVertex) { | |
281 | delete fTrackParamAtVertex; | |
282 | fTrackParamAtVertex = 0x0; | |
ea94c18b | 283 | } |
de2cd600 | 284 | |
ea94c18b | 285 | fFitWithVertex = track.fFitWithVertex; |
96ebe67e | 286 | fVertexErrXY2[0] = track.fVertexErrXY2[0]; |
287 | fVertexErrXY2[1] = track.fVertexErrXY2[1]; | |
ea94c18b | 288 | fFitWithMCS = track.fFitWithMCS; |
289 | fGlobalChi2 = track.fGlobalChi2; | |
290 | fImproved = track.fImproved; | |
291 | fMatchTrigger = track.fMatchTrigger; | |
292 | floTrgNum = track.floTrgNum; | |
293 | fChi2MatchTrigger = track.fChi2MatchTrigger; | |
294 | fTrackID = track.fTrackID; | |
295 | fHitsPatternInTrigCh = track.fHitsPatternInTrigCh; | |
296 | fLocalTrigger = track.fLocalTrigger; | |
30178c30 | 297 | |
61adb9bd | 298 | return *this; |
a9e2aefa | 299 | } |
300 | ||
8429a5e4 | 301 | //__________________________________________________________________________ |
ea94c18b | 302 | AliMUONTrack::~AliMUONTrack() |
303 | { | |
304 | /// Destructor | |
96ebe67e | 305 | delete fTrackParamAtCluster; |
306 | delete fClusterWeightsNonBending; | |
307 | delete fClusterWeightsBending; | |
308 | delete fTrackParamAtVertex; | |
ea94c18b | 309 | } |
310 | ||
311 | //__________________________________________________________________________ | |
312 | void AliMUONTrack::Clear(Option_t* opt) | |
313 | { | |
314 | /// Clear arrays | |
96ebe67e | 315 | fTrackParamAtCluster->Clear(opt); |
316 | delete fClusterWeightsNonBending; fClusterWeightsNonBending = 0x0; | |
317 | delete fClusterWeightsBending; fClusterWeightsBending = 0x0; | |
318 | delete fTrackParamAtVertex; fTrackParamAtVertex = 0x0; | |
ea94c18b | 319 | } |
320 | ||
321 | //__________________________________________________________________________ | |
96ebe67e | 322 | void AliMUONTrack::AddTrackParamAtCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster &cluster, Bool_t copy) |
8429a5e4 | 323 | { |
96ebe67e | 324 | /// Copy given track parameters into a new TrackParamAtCluster |
325 | /// Link parameters with the associated cluster | |
326 | /// If copy=kTRUE: the cluster is copied then passed the trackParam which become its owner | |
327 | /// otherwise: make sure to do not delete the cluster until it is used by the track | |
328 | ||
329 | // check chamber ID of the associated cluster | |
330 | if (cluster.GetChamberId() < 0 || cluster.GetChamberId() > AliMUONConstants::NTrackingCh()) { | |
331 | AliError(Form("Chamber ID of the associated cluster is not valid (ChamberId=%d)",cluster.GetChamberId())); | |
ea94c18b | 332 | return; |
333 | } | |
334 | ||
96ebe67e | 335 | // check whether track parameters are given at the correct cluster z position |
336 | if (cluster.GetZ() != trackParam.GetZ()) { | |
337 | AliError("track parameters are given at a different z position than the one of the associated cluster"); | |
ea94c18b | 338 | return; |
339 | } | |
340 | ||
96ebe67e | 341 | // add parameters to the array of track parameters |
342 | AliMUONTrackParam* trackParamAtCluster = new ((*fTrackParamAtCluster)[GetNClusters()]) AliMUONTrackParam(trackParam); | |
343 | ||
344 | // link parameters with the associated cluster or its copy | |
345 | if (copy) { | |
1467f4ba | 346 | AliMUONVCluster *clusterCopy = static_cast<AliMUONVCluster*>(cluster.Clone()); |
96ebe67e | 347 | trackParamAtCluster->SetClusterPtr(clusterCopy, kTRUE); |
348 | } else trackParamAtCluster->SetClusterPtr(&cluster); | |
ea94c18b | 349 | } |
350 | ||
956019b6 | 351 | //__________________________________________________________________________ |
96ebe67e | 352 | void AliMUONTrack::RemoveTrackParamAtCluster(AliMUONTrackParam *trackParam) |
956019b6 | 353 | { |
96ebe67e | 354 | /// Remove trackParam from the array of TrackParamAtCluster |
355 | if (!fTrackParamAtCluster->Remove(trackParam)) { | |
356 | AliWarning("object to remove does not exist in array fTrackParamAtCluster"); | |
357 | return; | |
358 | } | |
de2cd600 | 359 | |
96ebe67e | 360 | fTrackParamAtCluster->Compress(); |
04b5ea16 | 361 | } |
362 | ||
ea94c18b | 363 | //__________________________________________________________________________ |
96ebe67e | 364 | void AliMUONTrack::UpdateTrackParamAtCluster() |
d2b1e7bb | 365 | { |
96ebe67e | 366 | /// Update track parameters at each attached cluster |
ea94c18b | 367 | |
96ebe67e | 368 | if (GetNClusters() == 0) { |
369 | AliWarning("no cluster attached to the track"); | |
ea94c18b | 370 | return; |
371 | } | |
372 | ||
96ebe67e | 373 | AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
374 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam); | |
375 | while (trackParamAtCluster) { | |
ea94c18b | 376 | |
377 | // reset track parameters and their covariances | |
96ebe67e | 378 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
379 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
ea94c18b | 380 | |
381 | // extrapolation to the given z | |
96ebe67e | 382 | AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ()); |
ea94c18b | 383 | |
384 | // prepare next step | |
96ebe67e | 385 | startingTrackParam = trackParamAtCluster; |
386 | trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster)); | |
ea94c18b | 387 | } |
388 | ||
d2b1e7bb | 389 | } |
390 | ||
b8dc484b | 391 | //__________________________________________________________________________ |
96ebe67e | 392 | void AliMUONTrack::UpdateCovTrackParamAtCluster() |
ea94c18b | 393 | { |
96ebe67e | 394 | /// Update track parameters and their covariances at each attached cluster |
395 | /// Include effects of multiple scattering in chambers | |
ea94c18b | 396 | |
96ebe67e | 397 | if (GetNClusters() == 0) { |
398 | AliWarning("no cluster attached to the track"); | |
ea94c18b | 399 | return; |
400 | } | |
401 | ||
96ebe67e | 402 | AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
403 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam); | |
404 | Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() + 1; | |
405 | Int_t currentChamber; | |
406 | while (trackParamAtCluster) { | |
ea94c18b | 407 | |
408 | // reset track parameters and their covariances | |
96ebe67e | 409 | trackParamAtCluster->SetParameters(startingTrackParam->GetParameters()); |
410 | trackParamAtCluster->SetZ(startingTrackParam->GetZ()); | |
411 | trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances()); | |
ea94c18b | 412 | |
96ebe67e | 413 | // add MCS effect |
414 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.); | |
415 | ||
416 | // add MCS in missing chambers if any | |
417 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); | |
418 | while (currentChamber > expectedChamber) { | |
419 | // extrapolation to the missing chamber | |
420 | AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber)); | |
421 | // add MCS effect | |
422 | AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.); | |
423 | expectedChamber++; | |
424 | } | |
425 | ||
426 | // extrapolation to the z of the current cluster | |
427 | AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ()); | |
ea94c18b | 428 | |
429 | // prepare next step | |
96ebe67e | 430 | expectedChamber = currentChamber + 1; |
431 | startingTrackParam = trackParamAtCluster; | |
432 | trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster)); | |
ea94c18b | 433 | } |
96ebe67e | 434 | |
208f139e | 435 | } |
436 | ||
ea94c18b | 437 | //__________________________________________________________________________ |
438 | Bool_t AliMUONTrack::ComputeLocalChi2(Bool_t accountForMCS) | |
439 | { | |
96ebe67e | 440 | /// Compute each cluster contribution to the chi2 of the track |
ea94c18b | 441 | /// accounting for multiple scattering or not according to the flag |
96ebe67e | 442 | /// - Also recompute the weight matrices of the attached clusters if accountForMCS=kTRUE |
443 | /// - Assume that track parameters at each cluster are corrects | |
ea94c18b | 444 | /// - Return kFALSE if computation failed |
445 | ||
ea94c18b | 446 | if (accountForMCS) { // Compute local chi2 taking into account multiple scattering effects |
447 | ||
448 | // Compute MCS covariance matrix only once | |
96ebe67e | 449 | Int_t nClusters = GetNClusters(); |
450 | TMatrixD mcsCovariances(nClusters,nClusters); | |
ea94c18b | 451 | ComputeMCSCovariances(mcsCovariances); |
452 | ||
96ebe67e | 453 | // Make sure cluster weights are consistent with following calculations |
454 | if (!ComputeClusterWeights(&mcsCovariances)) { | |
ea94c18b | 455 | AliWarning("cannot take into account the multiple scattering effects"); |
456 | return ComputeLocalChi2(kFALSE); | |
457 | } | |
458 | ||
459 | // Compute chi2 of the track | |
460 | Double_t globalChi2 = ComputeGlobalChi2(kTRUE); | |
461 | if (globalChi2 < 0.) return kFALSE; | |
462 | ||
96ebe67e | 463 | // Loop over removable clusters and compute their local chi2 |
464 | AliMUONTrackParam* trackParamAtCluster1; | |
465 | AliMUONVCluster *cluster, *discardedCluster; | |
466 | Int_t iCluster1, iCluster2, iCurrentCluster1, iCurrentCluster2; | |
467 | TMatrixD ClusterWeightsNB(nClusters-1,nClusters-1); | |
468 | TMatrixD ClusterWeightsB(nClusters-1,nClusters-1); | |
469 | Double_t *dX = new Double_t[nClusters-1]; | |
470 | Double_t *dY = new Double_t[nClusters-1]; | |
ea94c18b | 471 | Double_t globalChi2b; |
96ebe67e | 472 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
473 | while (trackParamAtCluster) { | |
ea94c18b | 474 | |
96ebe67e | 475 | discardedCluster = trackParamAtCluster->GetClusterPtr(); |
ea94c18b | 476 | |
96ebe67e | 477 | // Recompute cluster weights without the current cluster |
478 | if (!ComputeClusterWeights(ClusterWeightsNB, ClusterWeightsB, &mcsCovariances, discardedCluster)) { | |
ea94c18b | 479 | AliWarning("cannot take into account the multiple scattering effects"); |
96ebe67e | 480 | delete [] dX; |
481 | delete [] dY; | |
482 | return ComputeLocalChi2(kFALSE); | |
ea94c18b | 483 | } |
484 | ||
96ebe67e | 485 | // Compute track chi2 without the current cluster |
ea94c18b | 486 | globalChi2b = 0.; |
96ebe67e | 487 | iCurrentCluster1 = 0; |
488 | for (iCluster1 = 0; iCluster1 < nClusters ; iCluster1++) { | |
489 | trackParamAtCluster1 = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1); | |
490 | cluster = trackParamAtCluster1->GetClusterPtr(); | |
ea94c18b | 491 | |
96ebe67e | 492 | if (cluster == discardedCluster) continue; |
ea94c18b | 493 | |
494 | // Compute and save residuals | |
96ebe67e | 495 | dX[iCurrentCluster1] = cluster->GetX() - trackParamAtCluster1->GetNonBendingCoor(); |
496 | dY[iCurrentCluster1] = cluster->GetY() - trackParamAtCluster1->GetBendingCoor(); | |
ea94c18b | 497 | |
96ebe67e | 498 | iCurrentCluster2 = 0; |
499 | for (iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) { | |
500 | cluster = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
ea94c18b | 501 | |
96ebe67e | 502 | if (cluster == discardedCluster) continue; |
ea94c18b | 503 | |
504 | // Add contribution from covariances | |
96ebe67e | 505 | globalChi2b += (ClusterWeightsNB(iCurrentCluster1, iCurrentCluster2) + |
506 | ClusterWeightsNB(iCurrentCluster2, iCurrentCluster1)) * dX[iCurrentCluster1] * dX[iCurrentCluster2] + | |
507 | (ClusterWeightsB(iCurrentCluster1, iCurrentCluster2) + | |
508 | ClusterWeightsB(iCurrentCluster2, iCurrentCluster1)) * dY[iCurrentCluster1] * dY[iCurrentCluster2]; | |
ea94c18b | 509 | |
96ebe67e | 510 | iCurrentCluster2++; |
ea94c18b | 511 | } |
512 | ||
513 | // Add contribution from variances | |
96ebe67e | 514 | globalChi2b += ClusterWeightsNB(iCurrentCluster1, iCurrentCluster1) * dX[iCurrentCluster1] * dX[iCurrentCluster1] + |
515 | ClusterWeightsB(iCurrentCluster1, iCurrentCluster1) * dY[iCurrentCluster1] * dY[iCurrentCluster1]; | |
ea94c18b | 516 | |
96ebe67e | 517 | iCurrentCluster1++; |
ea94c18b | 518 | } |
519 | ||
520 | // Set local chi2 | |
96ebe67e | 521 | trackParamAtCluster->SetLocalChi2(globalChi2 - globalChi2b); |
ea94c18b | 522 | |
96ebe67e | 523 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(trackParamAtCluster); |
ea94c18b | 524 | } |
525 | ||
526 | delete [] dX; | |
527 | delete [] dY; | |
528 | ||
529 | } else { // without multiple scattering effects | |
530 | ||
96ebe67e | 531 | AliMUONVCluster *discardedCluster; |
ea94c18b | 532 | Double_t dX, dY; |
96ebe67e | 533 | AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->First(); |
534 | while (trackParamAtCluster) { | |
ea94c18b | 535 | |
96ebe67e | 536 | discardedCluster = trackParamAtCluster->GetClusterPtr(); |
ea94c18b | 537 | |
538 | // Compute residuals | |
96ebe67e | 539 | dX = discardedCluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); |
540 | dY = discardedCluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
ea94c18b | 541 | |
542 | // Set local chi2 | |
96ebe67e | 543 | trackParamAtCluster->SetLocalChi2(dX * dX / discardedCluster->GetErrX2() + dY * dY / discardedCluster->GetErrY2()); |
ea94c18b | 544 | |
96ebe67e | 545 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(trackParamAtCluster); |
ea94c18b | 546 | } |
547 | ||
548 | } | |
549 | ||
ea94c18b | 550 | return kTRUE; |
551 | ||
552 | } | |
553 | ||
554 | //__________________________________________________________________________ | |
555 | Double_t AliMUONTrack::ComputeGlobalChi2(Bool_t accountForMCS) | |
556 | { | |
557 | /// Compute the chi2 of the track accounting for multiple scattering or not according to the flag | |
96ebe67e | 558 | /// - Assume that track parameters at each cluster are corrects |
559 | /// - Assume the cluster weights matrices are corrects | |
ea94c18b | 560 | /// - Return negative value if chi2 computation failed |
561 | ||
ea94c18b | 562 | Double_t chi2 = 0.; |
563 | ||
564 | if (accountForMCS) { | |
565 | ||
b709ac13 | 566 | // Check the weight matrices. If weight matrices are not available compute chi2 without MCS |
96ebe67e | 567 | if (!fClusterWeightsNonBending || !fClusterWeightsBending) { |
568 | AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering"); | |
b709ac13 | 569 | return ComputeGlobalChi2(kFALSE); |
570 | } | |
96ebe67e | 571 | Int_t nClusters = GetNClusters(); |
572 | if (fClusterWeightsNonBending->GetNrows() != nClusters || fClusterWeightsBending->GetNcols() != nClusters) { | |
573 | AliWarning("cluster weights including multiple scattering effects are not available\n\t\t --> compute chi2 WITHOUT multiple scattering"); | |
ea94c18b | 574 | return ComputeGlobalChi2(kFALSE); |
575 | } | |
576 | ||
577 | // Compute chi2 | |
96ebe67e | 578 | AliMUONVCluster *cluster; |
579 | Double_t *dX = new Double_t[nClusters]; | |
580 | Double_t *dY = new Double_t[nClusters]; | |
581 | AliMUONTrackParam* trackParamAtCluster; | |
582 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
583 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1); | |
584 | cluster = trackParamAtCluster->GetClusterPtr(); | |
585 | dX[iCluster1] = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
586 | dY[iCluster1] = cluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
587 | for (Int_t iCluster2 = 0; iCluster2 < iCluster1; iCluster2++) { | |
588 | chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster2) + (*fClusterWeightsNonBending)(iCluster2, iCluster1)) * dX[iCluster1] * dX[iCluster2] + | |
589 | ((*fClusterWeightsBending)(iCluster1, iCluster2) + (*fClusterWeightsBending)(iCluster2, iCluster1)) * dY[iCluster1] * dY[iCluster2]; | |
ea94c18b | 590 | } |
96ebe67e | 591 | chi2 += ((*fClusterWeightsNonBending)(iCluster1, iCluster1) * dX[iCluster1] * dX[iCluster1]) + |
592 | ((*fClusterWeightsBending)(iCluster1, iCluster1) * dY[iCluster1] * dY[iCluster1]); | |
ea94c18b | 593 | } |
594 | delete [] dX; | |
595 | delete [] dY; | |
596 | ||
597 | } else { | |
598 | ||
96ebe67e | 599 | AliMUONVCluster *cluster; |
ea94c18b | 600 | Double_t dX, dY; |
96ebe67e | 601 | AliMUONTrackParam* trackParamAtCluster; |
602 | Int_t nClusters = GetNClusters(); | |
603 | for (Int_t iCluster = 0; iCluster < nClusters ; iCluster++) { | |
604 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster); | |
605 | cluster = trackParamAtCluster->GetClusterPtr(); | |
606 | dX = cluster->GetX() - trackParamAtCluster->GetNonBendingCoor(); | |
607 | dY = cluster->GetY() - trackParamAtCluster->GetBendingCoor(); | |
608 | chi2 += dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2(); | |
ea94c18b | 609 | } |
610 | ||
611 | } | |
612 | ||
613 | return chi2; | |
614 | ||
615 | } | |
616 | ||
617 | //__________________________________________________________________________ | |
96ebe67e | 618 | Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD* mcsCovariances) |
ea94c18b | 619 | { |
96ebe67e | 620 | /// Compute the weight matrices of the attached clusters, in non bending and bending direction, |
621 | /// accounting for multiple scattering correlations and cluster resolution | |
ea94c18b | 622 | /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily) |
96ebe67e | 623 | /// - Assume that track parameters at each cluster are corrects |
ea94c18b | 624 | /// - Return kFALSE if computation failed |
625 | ||
626 | // Alocate memory | |
96ebe67e | 627 | Int_t nClusters = GetNClusters(); |
628 | if (!fClusterWeightsNonBending) fClusterWeightsNonBending = new TMatrixD(nClusters,nClusters); | |
629 | if (!fClusterWeightsBending) fClusterWeightsBending = new TMatrixD(nClusters,nClusters); | |
ea94c18b | 630 | |
631 | // Compute weights matrices | |
96ebe67e | 632 | if (!ComputeClusterWeights(*fClusterWeightsNonBending, *fClusterWeightsBending, mcsCovariances)) return kFALSE; |
ea94c18b | 633 | |
634 | return kTRUE; | |
635 | ||
636 | } | |
637 | ||
638 | //__________________________________________________________________________ | |
96ebe67e | 639 | Bool_t AliMUONTrack::ComputeClusterWeights(TMatrixD& ClusterWeightsNB, TMatrixD& ClusterWeightsB, |
640 | TMatrixD* mcsCovariances, AliMUONVCluster* discardedCluster) const | |
ea94c18b | 641 | { |
642 | /// Compute the weight matrices, in non bending and bending direction, | |
96ebe67e | 643 | /// of the other attached clusters assuming the discarded one does not exist |
644 | /// accounting for multiple scattering correlations and cluster resolution | |
ea94c18b | 645 | /// - Use the provided MCS covariance matrix if any (otherwise build it temporarily) |
646 | /// - Return kFALSE if computation failed | |
647 | ||
648 | // Check MCS covariance matrix and recompute it if need | |
96ebe67e | 649 | Int_t nClusters = GetNClusters(); |
ea94c18b | 650 | Bool_t deleteMCSCov = kFALSE; |
651 | if (!mcsCovariances) { | |
96ebe67e | 652 | mcsCovariances = new TMatrixD(nClusters,nClusters); |
ea94c18b | 653 | deleteMCSCov = kTRUE; |
654 | ComputeMCSCovariances(*mcsCovariances); | |
ea94c18b | 655 | } |
656 | ||
657 | // Resize the weights matrices; alocate memory | |
96ebe67e | 658 | if (discardedCluster) { |
659 | ClusterWeightsNB.ResizeTo(nClusters-1,nClusters-1); | |
660 | ClusterWeightsB.ResizeTo(nClusters-1,nClusters-1); | |
ea94c18b | 661 | } else { |
96ebe67e | 662 | ClusterWeightsNB.ResizeTo(nClusters,nClusters); |
663 | ClusterWeightsB.ResizeTo(nClusters,nClusters); | |
ea94c18b | 664 | } |
665 | ||
666 | // Define variables | |
96ebe67e | 667 | AliMUONVCluster *cluster1, *cluster2; |
668 | Int_t iCurrentCluster1, iCurrentCluster2; | |
ea94c18b | 669 | |
670 | // Compute the covariance matrices | |
96ebe67e | 671 | iCurrentCluster1 = 0; |
672 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { | |
673 | cluster1 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster1))->GetClusterPtr(); | |
ea94c18b | 674 | |
96ebe67e | 675 | if (cluster1 == discardedCluster) continue; |
ea94c18b | 676 | |
96ebe67e | 677 | // Loop over next clusters |
678 | iCurrentCluster2 = iCurrentCluster1; | |
679 | for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) { | |
680 | cluster2 = ((AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster2))->GetClusterPtr(); | |
ea94c18b | 681 | |
96ebe67e | 682 | if (cluster2 == discardedCluster) continue; |
ea94c18b | 683 | |
ea94c18b | 684 | // Fill with MCS covariances |
96ebe67e | 685 | ClusterWeightsNB(iCurrentCluster1, iCurrentCluster2) = (*mcsCovariances)(iCluster1,iCluster2); |
ea94c18b | 686 | |
687 | // Equal contribution from multiple scattering in non bending and bending directions | |
96ebe67e | 688 | ClusterWeightsB(iCurrentCluster1, iCurrentCluster2) = ClusterWeightsNB(iCurrentCluster1, iCurrentCluster2); |
ea94c18b | 689 | |
96ebe67e | 690 | // Add contribution from cluster resolution to diagonal element and symmetrize the matrix |
691 | if (iCurrentCluster1 == iCurrentCluster2) { | |
ea94c18b | 692 | |
693 | // In non bending plane | |
96ebe67e | 694 | ClusterWeightsNB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrX2(); |
ea94c18b | 695 | // In bending plane |
96ebe67e | 696 | ClusterWeightsB(iCurrentCluster1, iCurrentCluster1) += cluster1->GetErrY2(); |
ea94c18b | 697 | |
698 | } else { | |
699 | ||
700 | // In non bending plane | |
96ebe67e | 701 | ClusterWeightsNB(iCurrentCluster2, iCurrentCluster1) = ClusterWeightsNB(iCurrentCluster1, iCurrentCluster2); |
ea94c18b | 702 | // In bending plane |
96ebe67e | 703 | ClusterWeightsB(iCurrentCluster2, iCurrentCluster1) = ClusterWeightsB(iCurrentCluster1, iCurrentCluster2); |
ea94c18b | 704 | |
705 | } | |
706 | ||
96ebe67e | 707 | iCurrentCluster2++; |
ea94c18b | 708 | } |
709 | ||
96ebe67e | 710 | iCurrentCluster1++; |
ea94c18b | 711 | } |
712 | ||
713 | // Inversion of covariance matrices to get the weights | |
96ebe67e | 714 | if (ClusterWeightsNB.Determinant() != 0 && ClusterWeightsB.Determinant() != 0) { |
715 | ClusterWeightsNB.Invert(); | |
716 | ClusterWeightsB.Invert(); | |
ea94c18b | 717 | } else { |
718 | AliWarning(" Determinant = 0"); | |
96ebe67e | 719 | ClusterWeightsNB.ResizeTo(0,0); |
720 | ClusterWeightsB.ResizeTo(0,0); | |
ea94c18b | 721 | if(deleteMCSCov) delete mcsCovariances; |
722 | return kFALSE; | |
723 | } | |
724 | ||
725 | if(deleteMCSCov) delete mcsCovariances; | |
726 | ||
727 | return kTRUE; | |
728 | ||
729 | } | |
730 | ||
731 | //__________________________________________________________________________ | |
732 | void AliMUONTrack::ComputeMCSCovariances(TMatrixD& mcsCovariances) const | |
733 | { | |
734 | /// Compute the multiple scattering covariance matrix | |
96ebe67e | 735 | /// (assume that track parameters at each cluster are corrects) |
ea94c18b | 736 | |
b709ac13 | 737 | // Reset the size of the covariance matrix if needed |
96ebe67e | 738 | Int_t nClusters = GetNClusters(); |
739 | if (mcsCovariances.GetNrows() != nClusters) mcsCovariances.ResizeTo(nClusters,nClusters); | |
ea94c18b | 740 | |
741 | // Define variables | |
b709ac13 | 742 | Int_t nChambers = AliMUONConstants::NTrackingCh(); |
96ebe67e | 743 | AliMUONTrackParam* trackParamAtCluster; |
ea94c18b | 744 | AliMUONTrackParam extrapTrackParam; |
b709ac13 | 745 | Int_t currentChamber = 0, expectedChamber = 0, size = 0; |
746 | Double_t *mcsAngle2 = new Double_t[2*nChambers]; | |
747 | Double_t *zMCS = new Double_t[2*nChambers]; | |
96ebe67e | 748 | Int_t *indices = new Int_t[2*nClusters]; |
ea94c18b | 749 | |
750 | // Compute multiple scattering dispersion angle at each chamber | |
751 | // and save the z position where it is calculated | |
96ebe67e | 752 | for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) { |
753 | trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(iCluster); | |
ea94c18b | 754 | |
755 | // look for missing chambers if any | |
96ebe67e | 756 | currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId(); |
ea94c18b | 757 | while (currentChamber > expectedChamber) { |
758 | ||
759 | // Save the z position where MCS dispersion is calculated | |
b709ac13 | 760 | zMCS[size] = AliMUONConstants::DefaultChamberZ(expectedChamber); |
ea94c18b | 761 | |
96ebe67e | 762 | // Do not take into account MCS in chambers prior the first cluster |
763 | if (iCluster > 0) { | |
ea94c18b | 764 | |
765 | // Get track parameters at missing chamber z | |
96ebe67e | 766 | extrapTrackParam = *trackParamAtCluster; |
767 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, zMCS[size]); | |
ea94c18b | 768 | |
769 | // Save multiple scattering dispersion angle in missing chamber | |
b709ac13 | 770 | mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(),1.); |
ea94c18b | 771 | |
b709ac13 | 772 | } else mcsAngle2[size] = 0.; |
ea94c18b | 773 | |
774 | expectedChamber++; | |
b709ac13 | 775 | size++; |
ea94c18b | 776 | } |
777 | ||
778 | // Save z position where MCS dispersion is calculated | |
96ebe67e | 779 | zMCS[size] = trackParamAtCluster->GetZ(); |
ea94c18b | 780 | |
781 | // Save multiple scattering dispersion angle in current chamber | |
96ebe67e | 782 | mcsAngle2[size] = AliMUONTrackExtrap::GetMCSAngle2(*trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.); |
b709ac13 | 783 | |
784 | // Save indice in zMCS array corresponding to the current cluster | |
96ebe67e | 785 | indices[iCluster] = size; |
ea94c18b | 786 | |
b709ac13 | 787 | expectedChamber = currentChamber + 1; |
788 | size++; | |
ea94c18b | 789 | } |
790 | ||
96ebe67e | 791 | // complete array of z if last cluster is on the last but one chamber |
b709ac13 | 792 | if (currentChamber != nChambers-1) zMCS[size++] = AliMUONConstants::DefaultChamberZ(nChambers-1); |
ea94c18b | 793 | |
794 | // Compute the covariance matrix | |
96ebe67e | 795 | for (Int_t iCluster1 = 0; iCluster1 < nClusters; iCluster1++) { |
ea94c18b | 796 | |
96ebe67e | 797 | for (Int_t iCluster2 = iCluster1; iCluster2 < nClusters; iCluster2++) { |
ea94c18b | 798 | |
799 | // Initialization to 0 (diagonal plus upper triangular part) | |
96ebe67e | 800 | mcsCovariances(iCluster1,iCluster2) = 0.; |
ea94c18b | 801 | |
802 | // Compute contribution from multiple scattering in upstream chambers | |
96ebe67e | 803 | for (Int_t k = 0; k < indices[iCluster1]; k++) { |
804 | mcsCovariances(iCluster1,iCluster2) += (zMCS[indices[iCluster1]] - zMCS[k]) * (zMCS[indices[iCluster2]] - zMCS[k]) * mcsAngle2[k]; | |
ea94c18b | 805 | } |
806 | ||
807 | // Symetrize the matrix | |
96ebe67e | 808 | mcsCovariances(iCluster2,iCluster1) = mcsCovariances(iCluster1,iCluster2); |
ea94c18b | 809 | } |
810 | ||
811 | } | |
812 | ||
813 | delete [] mcsAngle2; | |
814 | delete [] zMCS; | |
b709ac13 | 815 | delete [] indices; |
ea94c18b | 816 | |
817 | } | |
818 | ||
208f139e | 819 | //__________________________________________________________________________ |
96ebe67e | 820 | Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track) const |
208f139e | 821 | { |
96ebe67e | 822 | /// Returns the number of clusters in common between the current track ("this") |
208f139e | 823 | /// and the track pointed to by "track". |
96ebe67e | 824 | Int_t clustersInCommon = 0; |
825 | AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2; | |
826 | // Loop over clusters of first track | |
827 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->First(); | |
828 | while (trackParamAtCluster1) { | |
829 | // Loop over clusters of second track | |
830 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->First(); | |
831 | while (trackParamAtCluster2) { | |
832 | // Increment "clustersInCommon" if both trackParamAtCluster1 & 2 point to the same cluster | |
833 | if ((trackParamAtCluster1->GetClusterPtr()) == (trackParamAtCluster2->GetClusterPtr())) { | |
834 | clustersInCommon++; | |
208f139e | 835 | break; |
836 | } | |
96ebe67e | 837 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->After(trackParamAtCluster2); |
838 | } // trackParamAtCluster2 | |
839 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->After(trackParamAtCluster1); | |
840 | } // trackParamAtCluster1 | |
841 | return clustersInCommon; | |
208f139e | 842 | } |
843 | ||
ea94c18b | 844 | //__________________________________________________________________________ |
845 | Double_t AliMUONTrack::GetNormalizedChi2() const | |
846 | { | |
847 | /// return the chi2 value divided by the number of degrees of freedom (or 1.e10 if ndf < 0) | |
848 | ||
96ebe67e | 849 | Double_t numberOfDegFree = (2. * GetNClusters() - 5.); |
ea94c18b | 850 | if (numberOfDegFree > 0.) return fGlobalChi2 / numberOfDegFree; |
851 | else return 1.e10; | |
852 | } | |
853 | ||
208f139e | 854 | //__________________________________________________________________________ |
96ebe67e | 855 | Bool_t* AliMUONTrack::CompatibleTrack(AliMUONTrack *track, Double_t sigma2Cut) const |
b8dc484b | 856 | { |
96ebe67e | 857 | /// for each chamber: return kTRUE (kFALSE) if clusters are compatible (not compatible) |
858 | AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2; | |
859 | AliMUONVCluster *cluster1, *cluster2; | |
860 | Double_t chi2, dX, dY, dZ; | |
861 | Double_t chi2Max = sigma2Cut * sigma2Cut; | |
862 | Double_t dZMax = 1.; // 1 cm | |
863 | ||
864 | Bool_t *compatibleCluster = new Bool_t[AliMUONConstants::NTrackingCh()]; | |
865 | for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) compatibleCluster[ch] = kFALSE; | |
b8dc484b | 866 | |
96ebe67e | 867 | // Loop over clusters of first track |
868 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->First(); | |
869 | while (trackParamAtCluster1) { | |
870 | ||
871 | cluster1 = trackParamAtCluster1->GetClusterPtr(); | |
872 | ||
873 | // Loop over clusters of second track | |
874 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->First(); | |
875 | while (trackParamAtCluster2) { | |
876 | ||
877 | cluster2 = trackParamAtCluster2->GetClusterPtr(); | |
878 | ||
879 | //prepare next step | |
880 | trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->After(trackParamAtCluster2); | |
881 | ||
882 | // z direction | |
883 | dZ = cluster1->GetZ() - cluster2->GetZ(); | |
884 | if (dZ > dZMax) continue; | |
885 | ||
886 | // non bending direction | |
887 | dX = cluster1->GetX() - cluster2->GetX(); | |
888 | chi2 = dX * dX / (cluster1->GetErrX2() + cluster2->GetErrX2()); | |
889 | if (chi2 > chi2Max) continue; | |
890 | ||
891 | // bending direction | |
892 | dY = cluster1->GetY() - cluster2->GetY(); | |
893 | chi2 = dY * dY / (cluster1->GetErrY2() + cluster2->GetErrY2()); | |
894 | if (chi2 > chi2Max) continue; | |
895 | ||
896 | compatibleCluster[cluster1->GetChamberId()] = kTRUE; | |
897 | break; | |
898 | } | |
899 | ||
900 | trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->After(trackParamAtCluster1); | |
b8dc484b | 901 | } |
902 | ||
96ebe67e | 903 | return compatibleCluster; |
8429a5e4 | 904 | } |
905 | ||
96ebe67e | 906 | //__________________________________________________________________________ |
907 | AliMUONTrackParam* AliMUONTrack::GetTrackParamAtVertex() | |
908 | { | |
909 | /// return reference to track parameters at vertex (create it before if needed) | |
910 | if (!fTrackParamAtVertex) fTrackParamAtVertex = new AliMUONTrackParam(); | |
911 | return fTrackParamAtVertex; | |
912 | } | |
913 | ||
914 | //__________________________________________________________________________ | |
915 | void AliMUONTrack::SetTrackParamAtVertex(const AliMUONTrackParam* trackParam) | |
916 | { | |
917 | /// set track parameters at vertex | |
918 | if (trackParam == 0x0) return; | |
919 | if (fTrackParamAtVertex) *fTrackParamAtVertex = *trackParam; | |
920 | else fTrackParamAtVertex = new AliMUONTrackParam(*trackParam); | |
921 | } | |
922 | ||
923 | //__________________________________________________________________________ | |
924 | void AliMUONTrack::RecursiveDump() const | |
a9e2aefa | 925 | { |
96ebe67e | 926 | /// Recursive dump of AliMUONTrack, i.e. with dump of trackParamAtCluster and attached clusters |
927 | AliMUONTrackParam *trackParamAtCluster; | |
928 | AliMUONVCluster *cluster; | |
de2cd600 | 929 | cout << "Recursive dump of Track: " << this << endl; |
930 | // Track | |
931 | this->Dump(); | |
96ebe67e | 932 | for (Int_t iCluster = 0; iCluster < GetNClusters(); iCluster++) { |
933 | trackParamAtCluster = (AliMUONTrackParam*) ((*fTrackParamAtCluster)[iCluster]); | |
934 | // trackParamAtCluster | |
935 | cout << "trackParamAtCluster: " << trackParamAtCluster << " (index: " << iCluster << ")" << endl; | |
936 | trackParamAtCluster->Dump(); | |
937 | cluster = trackParamAtCluster->GetClusterPtr(); | |
938 | // cluster | |
939 | cout << "cluster: " << cluster << endl; | |
940 | cluster->Print(); | |
a9e2aefa | 941 | } |
de2cd600 | 942 | return; |
a9e2aefa | 943 | } |
04b5ea16 | 944 | |
6464217e | 945 | //_____________________________________________- |
d2b1e7bb | 946 | void AliMUONTrack::Print(Option_t*) const |
6464217e | 947 | { |
2457f726 | 948 | /// Printing Track information |
d2b1e7bb | 949 | |
96ebe67e | 950 | cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNClusters() << |
6464217e | 951 | ", Match2Trig=" << setw(1) << GetMatchTrigger() << |
c6ba19f7 | 952 | ", LoTrgNum=" << setw(3) << GetLoTrgNum() << |
d2b1e7bb | 953 | ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger(); |
954 | cout << Form(" HitTriggerPattern %x",fHitsPatternInTrigCh) << endl; | |
96ebe67e | 955 | fTrackParamAtCluster->First()->Print("FULL"); |
6464217e | 956 | } |
423b32ca | 957 | |
958 | //__________________________________________________________________________ | |
959 | void AliMUONTrack::SetLocalTrigger(Int_t loCirc, Int_t loStripX, Int_t loStripY, Int_t loDev, Int_t loLpt, Int_t loHpt) | |
960 | { | |
961 | /// pack the local trigger information and store | |
962 | ||
01413742 | 963 | if (loCirc < 0) return; |
423b32ca | 964 | |
965 | fLocalTrigger = 0; | |
966 | fLocalTrigger += loCirc; | |
967 | fLocalTrigger += loStripX << 8; | |
968 | fLocalTrigger += loStripY << 13; | |
969 | fLocalTrigger += loDev << 17; | |
970 | fLocalTrigger += loLpt << 22; | |
971 | fLocalTrigger += loHpt << 24; | |
972 | ||
973 | } | |
974 |