]>
Commit | Line | Data |
---|---|---|
820b4d9e | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | //==================================================================================================================================================== | |
17 | // | |
18 | // Description of an ALICE muon forward track, combining the information of the Muon Spectrometer and the Muon Forward Tracker | |
19 | // | |
20 | // Contact author: antonio.uras@cern.ch | |
21 | // | |
22 | //==================================================================================================================================================== | |
23 | ||
24 | #include "AliLog.h" | |
25 | #include "AliMUONTrack.h" | |
26 | #include "AliMFTCluster.h" | |
27 | #include "AliMUONVCluster.h" | |
28 | #include "AliMUONTrackParam.h" | |
29 | #include "AliMUONTrackExtrap.h" | |
30 | #include "TClonesArray.h" | |
31 | #include "TMatrixD.h" | |
32 | #include "TParticle.h" | |
33 | #include "AliMuonForwardTrack.h" | |
d4643a10 | 34 | #include "AliMFTConstants.h" |
820b4d9e | 35 | |
36 | ClassImp(AliMuonForwardTrack) | |
37 | ||
38 | //==================================================================================================================================================== | |
39 | ||
40 | AliMuonForwardTrack::AliMuonForwardTrack(): | |
41 | AliMUONTrack(), | |
42 | fMUONTrack(0), | |
43 | fMCTrackRef(0), | |
d4643a10 | 44 | fMFTClusters(0), |
7e3dd1af | 45 | fNWrongClustersMC(-1), |
46 | fTrackMCId(-1) | |
820b4d9e | 47 | { |
48 | ||
49 | // default constructor | |
d4643a10 | 50 | |
51 | for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = kFALSE; | |
52 | for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) { | |
53 | fParentMCLabel[iParent] = -1; | |
54 | fParentPDGCode[iParent] = 0; | |
55 | } | |
820b4d9e | 56 | fMFTClusters = new TClonesArray("AliMFTCluster"); |
57 | ||
58 | } | |
59 | ||
60 | //==================================================================================================================================================== | |
61 | ||
62 | AliMuonForwardTrack::AliMuonForwardTrack(AliMUONTrack *MUONTrack): | |
63 | AliMUONTrack(), | |
64 | fMUONTrack(0), | |
65 | fMCTrackRef(0), | |
d4643a10 | 66 | fMFTClusters(0), |
7e3dd1af | 67 | fNWrongClustersMC(-1), |
68 | fTrackMCId(-1) | |
820b4d9e | 69 | { |
70 | ||
71 | SetMUONTrack(MUONTrack); | |
d4643a10 | 72 | for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = kFALSE; |
73 | for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) { | |
74 | fParentMCLabel[iParent] = -1; | |
75 | fParentPDGCode[iParent] = 0; | |
76 | } | |
820b4d9e | 77 | fMFTClusters = new TClonesArray("AliMFTCluster"); |
78 | ||
79 | } | |
80 | ||
81 | //==================================================================================================================================================== | |
82 | ||
83 | AliMuonForwardTrack::AliMuonForwardTrack(const AliMuonForwardTrack& track): | |
84 | AliMUONTrack(track), | |
d4643a10 | 85 | fMUONTrack(0x0), |
86 | fMCTrackRef(0x0), | |
87 | fMFTClusters(0x0), | |
7e3dd1af | 88 | fNWrongClustersMC(track.fNWrongClustersMC), |
89 | fTrackMCId(track.fTrackMCId) | |
820b4d9e | 90 | { |
91 | ||
92 | // copy constructor | |
d4643a10 | 93 | fMUONTrack = new AliMUONTrack(*(track.fMUONTrack)); |
94 | if (track.fMCTrackRef) fMCTrackRef = new TParticle(*(track.fMCTrackRef)); | |
95 | fMFTClusters = new TClonesArray(*(track.fMFTClusters)); | |
96 | for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = (track.fPlaneExists)[iPlane]; | |
97 | for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) { | |
98 | fParentMCLabel[iParent] = (track.fParentMCLabel)[iParent]; | |
99 | fParentPDGCode[iParent] = (track.fParentPDGCode)[iParent]; | |
100 | } | |
820b4d9e | 101 | |
102 | } | |
103 | ||
104 | //==================================================================================================================================================== | |
105 | ||
106 | AliMuonForwardTrack& AliMuonForwardTrack::operator=(const AliMuonForwardTrack& track) { | |
107 | ||
108 | // Asignment operator | |
109 | ||
110 | // check assignement to self | |
111 | if (this == &track) return *this; | |
112 | ||
113 | // base class assignement | |
114 | AliMUONTrack::operator=(track); | |
115 | ||
116 | // clear memory | |
117 | Clear(); | |
118 | ||
d4643a10 | 119 | fMUONTrack = new AliMUONTrack(*(track.fMUONTrack)); |
120 | if (track.fMCTrackRef) fMCTrackRef = new TParticle(*(track.fMCTrackRef)); | |
121 | fMFTClusters = new TClonesArray(*(track.fMFTClusters)); | |
122 | fNWrongClustersMC = track.fNWrongClustersMC; | |
7e3dd1af | 123 | fTrackMCId = track.fTrackMCId; |
d4643a10 | 124 | |
125 | for (Int_t iPlane=0; iPlane<AliMFTConstants::fNMaxPlanes; iPlane++) fPlaneExists[iPlane] = (track.fPlaneExists)[iPlane]; | |
126 | for (Int_t iParent=0; iParent<fgkNParentsMax; iParent++) { | |
127 | fParentMCLabel[iParent] = (track.fParentMCLabel)[iParent]; | |
128 | fParentPDGCode[iParent] = (track.fParentPDGCode)[iParent]; | |
129 | } | |
820b4d9e | 130 | |
131 | return *this; | |
132 | ||
133 | } | |
134 | ||
135 | //==================================================================================================================================================== | |
136 | ||
53b30119 | 137 | AliMuonForwardTrack::~AliMuonForwardTrack() { |
138 | ||
139 | delete fMUONTrack; | |
140 | delete fMCTrackRef; | |
53b30119 | 141 | delete fMFTClusters; |
142 | ||
143 | } | |
144 | ||
145 | //==================================================================================================================================================== | |
146 | ||
820b4d9e | 147 | void AliMuonForwardTrack::SetMUONTrack(AliMUONTrack *MUONTrack) { |
148 | ||
149 | if (fMUONTrack) { | |
150 | AliInfo("fMUONTrack already exists, nothing will be done"); | |
151 | return; | |
152 | } | |
153 | ||
154 | fMUONTrack = MUONTrack; | |
d4643a10 | 155 | SetGlobalChi2(fMUONTrack->GetGlobalChi2()); |
820b4d9e | 156 | |
157 | } | |
158 | ||
159 | //==================================================================================================================================================== | |
160 | ||
161 | void AliMuonForwardTrack::SetMCTrackRef(TParticle *MCTrackRef) { | |
162 | ||
163 | if (fMCTrackRef) { | |
164 | AliInfo("fMCTrackRef already exists, nothing will be done"); | |
165 | return; | |
166 | } | |
167 | ||
168 | fMCTrackRef = MCTrackRef; | |
169 | ||
170 | } | |
171 | ||
172 | //==================================================================================================================================================== | |
173 | ||
174 | void AliMuonForwardTrack::AddTrackParamAtMFTCluster(AliMUONTrackParam &trackParam, AliMFTCluster &mftCluster) { | |
175 | ||
d4643a10 | 176 | AliDebug(1, Form("Before adding: this->fMFTClusters=%p has %d entries", this->fMFTClusters, this->fMFTClusters->GetEntries())); |
177 | Int_t iMFTCluster = this->fMFTClusters->GetEntries(); | |
820b4d9e | 178 | AliDebug(1, Form("mftCluster->GetX() = %f mftCluster->GetY() = %f mftCluster->GetErrX() = %f cmftCluster->GetErrY() = %f", |
179 | mftCluster.GetX(), mftCluster.GetY(), mftCluster.GetErrX(), mftCluster.GetErrY())); | |
180 | AliMUONVCluster *muonCluster = (AliMUONVCluster*) mftCluster.CreateMUONCluster(); | |
181 | AliDebug(1, Form("Created MUON cluster %p", muonCluster)); | |
182 | trackParam.SetUniqueID(iMFTCluster); // we profit of this slot to store the reference to the corresponding MFTCluster | |
183 | AliDebug(1, Form("Now adding muonCluster %p and trackParam %p",muonCluster, &trackParam)); | |
184 | AddTrackParamAtCluster(trackParam, *muonCluster, kTRUE); | |
820b4d9e | 185 | // we pass the parameters this->GetTrackParamAtCluster()->First() to the Kalman Filter algorithm: they will be updated!! |
186 | Double_t chi2Kalman = RunKalmanFilter(*(AliMUONTrackParam*)(GetTrackParamAtCluster()->First())); | |
d4643a10 | 187 | AliDebug(1, Form("Adding Kalman chi2 = %f to global chi2 = %f", chi2Kalman, GetGlobalChi2())); |
820b4d9e | 188 | Double_t newGlobalChi2 = GetGlobalChi2() + chi2Kalman; |
189 | mftCluster.SetLocalChi2(chi2Kalman); | |
190 | mftCluster.SetTrackChi2(newGlobalChi2); | |
d4643a10 | 191 | new ((*(this->fMFTClusters))[iMFTCluster]) AliMFTCluster(mftCluster); |
192 | AliDebug(1, Form("GetTrackParamAtCluster() = %p has %d entries while this->fMFTClusters=%p has %d entries", | |
193 | GetTrackParamAtCluster(), GetTrackParamAtCluster()->GetEntries(), this->fMFTClusters, this->fMFTClusters->GetEntries())); | |
820b4d9e | 194 | AliDebug(1, Form("muonCluster->GetZ() = %f, trackParam->GetZ() = %f",muonCluster->GetZ(), trackParam.GetZ())); |
195 | SetGlobalChi2(newGlobalChi2); | |
d4643a10 | 196 | AliDebug(1, Form("New global chi2 = %f", GetGlobalChi2())); |
820b4d9e | 197 | ((AliMUONTrackParam*) GetTrackParamAtCluster()->First())->SetTrackChi2(newGlobalChi2); |
198 | for (Int_t iPar=0; iPar<GetTrackParamAtCluster()->GetEntries(); iPar++) { | |
199 | AliDebug(1, Form("GetTrackParamAtCluster()->At(%d)->GetClusterPtr() = %p", | |
200 | iPar, ((AliMUONTrackParam*)(GetTrackParamAtCluster()->At(iPar)))->GetClusterPtr())); | |
201 | } | |
202 | ||
203 | } | |
204 | ||
205 | //==================================================================================================================================================== | |
206 | ||
207 | AliMUONTrackParam* AliMuonForwardTrack::GetTrackParamAtMUONCluster(Int_t iMUONCluster) { | |
208 | ||
209 | if (iMUONCluster<0 || iMUONCluster>=GetNMUONClusters()) { | |
210 | AliError("Invalid MUON cluster index. NULL pointer will be returned"); | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | AliMUONTrackParam *trackParam = (AliMUONTrackParam*) fMUONTrack->GetTrackParamAtCluster()->At(iMUONCluster); | |
215 | ||
216 | return trackParam; | |
217 | ||
218 | } | |
219 | ||
220 | //==================================================================================================================================================== | |
221 | ||
222 | AliMUONTrackParam* AliMuonForwardTrack::GetTrackParamAtMFTCluster(Int_t iMFTCluster) { | |
223 | ||
224 | if (iMFTCluster<0 || iMFTCluster>=GetNMFTClusters()) { | |
225 | AliError("Invalid MFT cluster index. NULL pointer will be returned"); | |
226 | return NULL; | |
227 | } | |
228 | ||
229 | AliMUONTrackParam *trackParam = (AliMUONTrackParam*) GetTrackParamAtCluster()->At(iMFTCluster); | |
230 | ||
231 | return trackParam; | |
232 | ||
233 | } | |
234 | ||
235 | //==================================================================================================================================================== | |
236 | ||
237 | AliMUONVCluster* AliMuonForwardTrack::GetMUONCluster(Int_t iMUONCluster) { | |
238 | ||
239 | if (iMUONCluster<0 || iMUONCluster>=GetNMUONClusters()) { | |
240 | AliError("Invalid MUON cluster index. NULL pointer will be returned"); | |
241 | return NULL; | |
242 | } | |
243 | ||
244 | AliMUONTrackParam *trackParam = GetTrackParamAtMUONCluster(iMUONCluster); | |
245 | AliMUONVCluster *muonCluster = trackParam->GetClusterPtr(); | |
246 | ||
247 | return muonCluster; | |
248 | ||
249 | } | |
250 | ||
251 | //==================================================================================================================================================== | |
252 | ||
253 | AliMFTCluster* AliMuonForwardTrack::GetMFTCluster(Int_t iMFTCluster) { | |
254 | ||
255 | if (iMFTCluster<0 || iMFTCluster>=GetNMFTClusters()) { | |
d4643a10 | 256 | AliError(Form("Invalid MFT cluster index (%d). GetNMFTClusters()=%d. NULL pointer will be returned", iMFTCluster, GetNMFTClusters())); |
820b4d9e | 257 | return NULL; |
258 | } | |
259 | ||
260 | AliMUONTrackParam *trackParam = GetTrackParamAtMFTCluster(iMFTCluster); | |
d4643a10 | 261 | AliMFTCluster *mftCluster = (AliMFTCluster*) this->fMFTClusters->At(trackParam->GetUniqueID()); |
820b4d9e | 262 | |
263 | return mftCluster; | |
264 | ||
265 | } | |
266 | ||
267 | //==================================================================================================================================================== | |
268 | ||
269 | Double_t AliMuonForwardTrack::RunKalmanFilter(AliMUONTrackParam &trackParamAtCluster) { | |
270 | ||
271 | AliDebug(1, Form("Running Kalman filter for parameters %p (z = %f) and cluster %p (z = %f)", | |
272 | &trackParamAtCluster, trackParamAtCluster.GetZ(), trackParamAtCluster.GetClusterPtr(), trackParamAtCluster.GetClusterPtr()->GetZ())); | |
273 | ||
274 | // Compute new track parameters and their covariances including new cluster using kalman filter | |
275 | // return the *additional* track chi2 | |
276 | ||
277 | // Get actual track parameters (p) | |
278 | TMatrixD param(trackParamAtCluster.GetParameters()); | |
279 | ||
280 | // Get new cluster parameters (m) | |
281 | AliMUONVCluster *cluster = trackParamAtCluster.GetClusterPtr(); | |
282 | AliDebug(1, Form("cluster->GetX() = %f cluster->GetY() = %f cluster->GetErrX() = %f cluster->GetErrY() = %f", | |
283 | cluster->GetX(), cluster->GetY(), cluster->GetErrX(), cluster->GetErrY())); | |
284 | TMatrixD clusterParam(5,1); | |
285 | clusterParam.Zero(); | |
286 | clusterParam(0,0) = cluster->GetX(); | |
287 | clusterParam(2,0) = cluster->GetY(); | |
288 | ||
289 | // Compute the current parameter weight (W) | |
290 | TMatrixD paramWeight(trackParamAtCluster.GetCovariances()); | |
291 | if (paramWeight.Determinant() != 0) { | |
292 | paramWeight.Invert(); | |
293 | } else { | |
294 | Warning("RunKalmanFilter"," Determinant = 0"); | |
295 | return 1.e10; | |
296 | } | |
297 | ||
298 | // Compute the new cluster weight (U) | |
299 | TMatrixD clusterWeight(5,5); | |
300 | clusterWeight.Zero(); | |
301 | clusterWeight(0,0) = 1. / cluster->GetErrX2(); | |
302 | clusterWeight(2,2) = 1. / cluster->GetErrY2(); | |
303 | ||
304 | // Compute the new parameters covariance matrix ( (W+U)^-1 ) | |
305 | TMatrixD newParamCov(paramWeight,TMatrixD::kPlus,clusterWeight); | |
306 | if (newParamCov.Determinant() != 0) { | |
307 | newParamCov.Invert(); | |
308 | } | |
309 | else { | |
310 | Warning("RunKalmanFilter"," Determinant = 0"); | |
311 | return 1.e10; | |
312 | } | |
313 | ||
314 | // Save the new parameters covariance matrix | |
315 | trackParamAtCluster.SetCovariances(newParamCov); | |
316 | ||
317 | // Compute the new parameters (p' = ((W+U)^-1)U(m-p) + p) | |
318 | TMatrixD tmp(clusterParam,TMatrixD::kMinus,param); | |
319 | TMatrixD tmp2(clusterWeight,TMatrixD::kMult,tmp); // U(m-p) | |
320 | TMatrixD newParam(newParamCov,TMatrixD::kMult,tmp2); // ((W+U)^-1)U(m-p) | |
321 | newParam += param; // ((W+U)^-1)U(m-p) + p | |
322 | ||
323 | // Save the new parameters | |
324 | trackParamAtCluster.SetParameters(newParam); | |
325 | ||
326 | // Compute the additional chi2 (= ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m)) | |
327 | tmp = newParam; // p' | |
328 | tmp -= param; // (p'-p) | |
329 | TMatrixD tmp3(paramWeight,TMatrixD::kMult,tmp); // W(p'-p) | |
330 | TMatrixD addChi2Track(tmp,TMatrixD::kTransposeMult,tmp3); // ((p'-p)^-1)W(p'-p) | |
331 | tmp = newParam; // p' | |
332 | tmp -= clusterParam; // (p'-m) | |
333 | TMatrixD tmp4(clusterWeight,TMatrixD::kMult,tmp); // U(p'-m) | |
334 | addChi2Track += TMatrixD(tmp,TMatrixD::kTransposeMult,tmp4); // ((p'-p)^-1)W(p'-p) + ((p'-m)^-1)U(p'-m) | |
335 | ||
336 | AliDebug(1,Form("Adding Kalman chi2 = %f",addChi2Track(0,0))); | |
337 | ||
338 | return addChi2Track(0,0); | |
339 | ||
340 | } | |
341 | ||
342 | //==================================================================================================================================================== | |
343 | ||
344 | Double_t AliMuonForwardTrack::GetWeightedOffset(Double_t x, Double_t y, Double_t z) { | |
345 | ||
346 | AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0); | |
347 | AliMUONTrackExtrap::ExtrapToZCov(param, z); | |
348 | ||
349 | TMatrixD cov(5,5); | |
350 | cov = param->GetCovariances(); | |
351 | ||
352 | TMatrixD covCoordinates(2,2); | |
353 | covCoordinates(0,0) = cov(0,0); | |
354 | covCoordinates(0,1) = cov(0,2); | |
355 | covCoordinates(1,0) = cov(2,0); | |
356 | covCoordinates(1,1) = cov(2,2); | |
357 | ||
358 | TMatrixD covCoordinatesInverse = covCoordinates.Invert(); | |
359 | ||
360 | Double_t dX = param->GetNonBendingCoor() - x; | |
361 | Double_t dY = param->GetBendingCoor() - y; | |
362 | ||
363 | Double_t weightedOffset = TMath::Sqrt(0.5*(dX*dX*covCoordinatesInverse(0,0) + | |
364 | dY*dY*covCoordinatesInverse(1,1) + | |
365 | 2.*dX*dY*covCoordinatesInverse(0,1))); | |
366 | ||
367 | return weightedOffset; | |
368 | ||
369 | } | |
370 | ||
371 | //==================================================================================================================================================== | |
372 | ||
373 | Double_t AliMuonForwardTrack::GetOffsetX(Double_t x, Double_t z) { | |
374 | ||
375 | AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0); | |
376 | AliMUONTrackExtrap::ExtrapToZCov(param, z); | |
377 | Double_t dX = param->GetNonBendingCoor() - x; | |
378 | return dX; | |
379 | ||
380 | } | |
381 | ||
382 | //==================================================================================================================================================== | |
383 | ||
384 | Double_t AliMuonForwardTrack::GetOffsetY(Double_t y, Double_t z) { | |
385 | ||
386 | AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0); | |
387 | AliMUONTrackExtrap::ExtrapToZCov(param, z); | |
388 | Double_t dY = param->GetBendingCoor() - y; | |
389 | return dY; | |
390 | ||
391 | } | |
392 | ||
393 | //==================================================================================================================================================== | |
394 | ||
395 | Double_t AliMuonForwardTrack::GetOffset(Double_t x, Double_t y, Double_t z) { | |
396 | ||
397 | AliMUONTrackParam *param = GetTrackParamAtMFTCluster(0); | |
398 | AliMUONTrackExtrap::ExtrapToZCov(param, z); | |
399 | Double_t dX = param->GetNonBendingCoor() - x; | |
400 | Double_t dY = param->GetBendingCoor() - y; | |
401 | return TMath::Sqrt(dX*dX + dY*dY); | |
402 | ||
403 | } | |
404 | ||
405 | //==================================================================================================================================================== | |
406 |