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1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | //==================================================================================================================================================== | |
17 | // | |
18 | // MFT tracker | |
19 | // | |
20 | // Class for the creation of the "global muon tracks" built from the tracks reconstructed in the | |
21 | // muon spectrometer and the clusters of the Muon Forward Tracker | |
22 | // | |
23 | // Contact author: antonio.uras@cern.ch | |
24 | // | |
25 | //==================================================================================================================================================== | |
26 | ||
27 | #include "TTree.h" | |
28 | #include "AliLog.h" | |
29 | #include "AliGeomManager.h" | |
30 | #include "AliESDEvent.h" | |
31 | #include "AliESDMuonTrack.h" | |
026547c6 | 32 | #include "AliESDMuonGlobalTrack.h" |
4cc511f4 AU |
33 | #include "AliMFTTrackerMU.h" |
34 | #include "TMath.h" | |
35 | #include "AliRun.h" | |
36 | #include "AliMFT.h" | |
37 | #include "AliMUONTrackExtrap.h" | |
38 | #include "AliMUONTrack.h" | |
39 | #include "AliMUONESDInterface.h" | |
40 | #include "AliMuonForwardTrack.h" | |
026547c6 | 41 | #include "AliMUONConstants.h" |
4cc511f4 AU |
42 | |
43 | ClassImp(AliMFTTrackerMU) | |
44 | ||
45 | const Double_t AliMFTTrackerMU::fRadLengthSi = AliMFTConstants::fRadLengthSi; | |
46 | ||
47 | //==================================================================================================================================================== | |
48 | ||
49 | AliMFTTrackerMU::AliMFTTrackerMU() : | |
50 | AliTracker(), | |
51 | fESD(0), | |
52 | fMFT(0), | |
53 | fSegmentation(0), | |
54 | fNPlanesMFT(0), | |
55 | fNPlanesMFTAnalyzed(0), | |
e21f8bf5 | 56 | fSigmaClusterCut(2), |
4cc511f4 AU |
57 | fScaleSigmaClusterCut(1.), |
58 | fNMaxMissingMFTClusters(0), | |
59 | fGlobalTrackingDiverged(kFALSE), | |
60 | fCandidateTracks(0), | |
61 | fMUONTrack(0), | |
62 | fCurrentTrack(0), | |
63 | fFinalBestCandidate(0), | |
64 | fVertexErrorX(0.015), | |
65 | fVertexErrorY(0.015), | |
66 | fVertexErrorZ(0.010), | |
67 | fBransonCorrection(kFALSE) | |
68 | { | |
69 | ||
70 | //-------------------------------------------------------------------- | |
71 | // This is the AliMFTTrackerMU constructor | |
72 | //-------------------------------------------------------------------- | |
73 | ||
74 | fMFT = (AliMFT*) gAlice->GetDetector("MFT"); | |
75 | fSegmentation = fMFT->GetSegmentation(); | |
76 | SetNPlanesMFT(fSegmentation->GetNPlanes()); | |
77 | AliMUONTrackExtrap::SetField(); // set the magnetic field for track extrapolations | |
78 | ||
e21f8bf5 | 79 | AliInfo(Form("fMFT = %p, fSegmentation = %p", fMFT, fSegmentation)); |
80 | ||
4cc511f4 | 81 | for (Int_t iPlane=0; iPlane<fNPlanesMFT; iPlane++) { |
e21f8bf5 | 82 | fMFTClusterArray[iPlane] = new TClonesArray("AliMFTCluster"); |
4cc511f4 AU |
83 | fMFTClusterArrayFront[iPlane] = new TClonesArray("AliMFTCluster"); |
84 | fMFTClusterArrayBack[iPlane] = new TClonesArray("AliMFTCluster"); | |
e21f8bf5 | 85 | fMFTClusterArray[iPlane] -> SetOwner(kTRUE); |
86 | fMFTClusterArrayFront[iPlane] -> SetOwner(kTRUE); | |
87 | fMFTClusterArrayBack[iPlane] -> SetOwner(kTRUE); | |
88 | fMinResearchRadiusAtPlane[iPlane] = 0.; | |
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89 | } |
90 | ||
e21f8bf5 | 91 | fCandidateTracks = new TClonesArray("AliMuonForwardTrack",50000); |
92 | ||
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93 | } |
94 | ||
95 | //==================================================================================================================================================== | |
96 | ||
97 | AliMFTTrackerMU::~AliMFTTrackerMU() { | |
98 | ||
99 | // destructor | |
100 | ||
101 | for (Int_t iPlane=0; iPlane<fNPlanesMFT; iPlane++) { | |
e21f8bf5 | 102 | fMFTClusterArray[iPlane] -> Delete(); |
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103 | delete fMFTClusterArray[iPlane]; |
104 | delete fMFTClusterArrayFront[iPlane]; | |
105 | delete fMFTClusterArrayBack[iPlane]; | |
106 | } | |
107 | ||
e21f8bf5 | 108 | delete fCandidateTracks; |
109 | ||
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110 | } |
111 | ||
112 | //==================================================================================================================================================== | |
113 | ||
114 | Int_t AliMFTTrackerMU::LoadClusters(TTree *cTree) { | |
115 | ||
116 | //-------------------------------------------------------------------- | |
117 | // This function loads the MFT clusters | |
118 | //-------------------------------------------------------------------- | |
119 | ||
e21f8bf5 | 120 | for (Int_t iPlane=0; iPlane<fNPlanesMFT; iPlane++) { |
121 | AliDebug(1, Form("Setting Address for Branch Plane_%02d", iPlane)); | |
122 | cTree->SetBranchAddress(Form("Plane_%02d",iPlane), &fMFTClusterArray[iPlane]); | |
123 | } | |
124 | ||
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125 | if (!cTree->GetEvent()) return kFALSE; |
126 | for (Int_t iPlane=0; iPlane<fNPlanesMFT; iPlane++) { | |
e21f8bf5 | 127 | AliInfo(Form("plane %02d: nClusters = %d\n", iPlane, fMFTClusterArray[iPlane]->GetEntries())); |
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128 | } |
129 | SeparateFrontBackClusters(); | |
130 | ||
131 | return 0; | |
132 | ||
133 | } | |
134 | ||
135 | //==================================================================================================================================================== | |
136 | ||
137 | void AliMFTTrackerMU::UnloadClusters() { | |
138 | ||
e21f8bf5 | 139 | // //-------------------------------------------------------------------- |
140 | // // This function unloads MFT clusters | |
141 | // //-------------------------------------------------------------------- | |
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142 | |
143 | for (Int_t iPlane=0; iPlane<fNPlanesMFT; iPlane++) { | |
144 | fMFTClusterArray[iPlane] -> Clear("C"); | |
145 | fMFTClusterArrayFront[iPlane] -> Clear("C"); | |
146 | fMFTClusterArrayBack[iPlane] -> Clear("C"); | |
147 | } | |
148 | ||
149 | } | |
150 | ||
151 | //==================================================================================================================================================== | |
152 | ||
153 | Int_t AliMFTTrackerMU::Clusters2Tracks(AliESDEvent *event) { | |
154 | ||
155 | //-------------------------------------------------------------------- | |
156 | // This functions reconstructs the Muon Forward Tracks | |
157 | // The clusters must be already loaded ! | |
158 | //-------------------------------------------------------------------- | |
159 | ||
e21f8bf5 | 160 | // Tree of AliMuonForwardTrack objects. Created outside the ESD framework for cross-check purposes |
161 | ||
162 | TFile *outputFileMuonGlobalTracks = new TFile("MuonGlobalTracks.root", "update"); | |
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163 | TTree *outputTreeMuonGlobalTracks = new TTree("AliMuonForwardTracks", "Tree of AliMuonForwardTracks"); |
164 | TClonesArray *muonForwardTracks = new TClonesArray("AliMuonForwardTrack"); | |
165 | outputTreeMuonGlobalTracks -> Branch("tracks", &muonForwardTracks); | |
166 | ||
167 | //-------------------------------------------------------------------- | |
168 | ||
169 | fESD = event; | |
170 | ||
e21f8bf5 | 171 | // get the ITS primary vertex |
172 | ||
173 | Double_t vertex[3] = {0., 0., 0.}; | |
174 | const AliESDVertex* esdVert = fESD->GetVertex(); | |
175 | if (esdVert->GetNContributors() > 0 || !strcmp(esdVert->GetTitle(),"vertexer: smearMC")) { | |
176 | esdVert->GetXYZ(vertex); | |
177 | AliDebug(1,Form("found vertex (%e,%e,%e)",vertex[0],vertex[1],vertex[2])); | |
178 | } | |
179 | ||
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180 | //----------- Read ESD MUON tracks ------------------- |
181 | ||
182 | Int_t nTracksMUON = event->GetNumberOfMuonTracks(); | |
183 | ||
184 | AliInfo(Form("Number of ESD MUON tracks: %d\n", nTracksMUON)); | |
185 | ||
186 | Int_t iTrack=0; | |
187 | while (iTrack<nTracksMUON) { | |
188 | ||
189 | fNPlanesMFTAnalyzed = 0; | |
190 | ||
e21f8bf5 | 191 | AliInfo("****************************************************************************************"); |
192 | AliInfo(Form("*************************** MUON TRACK %3d/%d ***************************************", iTrack, nTracksMUON)); | |
193 | AliInfo("****************************************************************************************"); | |
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194 | |
195 | fCandidateTracks -> Delete(); | |
196 | ||
197 | fNPlanesMFTAnalyzed = 0; | |
198 | ||
199 | const AliESDMuonTrack *esdTrack = event->GetMuonTrack(iTrack); | |
e21f8bf5 | 200 | if (fMUONTrack) delete fMUONTrack; |
201 | fMUONTrack = new AliMUONTrack(); | |
202 | ||
f7cc8591 | 203 | AliMUONESDInterface::ESDToMUON(*esdTrack, *fMUONTrack, kFALSE); |
204 | ||
205 | if (!fMUONTrack->GetTrackParamAtCluster()->First()) { | |
206 | AliInfo("Skipping track, no parameters available!!!"); | |
207 | iTrack++; | |
208 | continue; | |
209 | } | |
4cc511f4 AU |
210 | |
211 | // the track we are going to build, starting from fMUONTrack and adding the MFT clusters | |
212 | AliMuonForwardTrack *track = new ((*fCandidateTracks)[0]) AliMuonForwardTrack(); | |
213 | track -> SetMUONTrack(new AliMUONTrack(*fMUONTrack)); | |
214 | track -> SetMCLabel(fMUONTrack->GetMCLabel()); | |
215 | track -> SetMatchTrigger(fMUONTrack->GetMatchTrigger()); | |
216 | ||
026547c6 | 217 | // track parameters linearly extrapolated from the first tracking station to the end of the absorber |
218 | AliMUONTrackParam trackParamEndOfAbsorber(*((AliMUONTrackParam*)(fMUONTrack->GetTrackParamAtCluster()->First()))); | |
219 | AliMUONTrackExtrap::ExtrapToZCov(&trackParamEndOfAbsorber, AliMUONConstants::AbsZEnd()); // absorber extends from -90 to -503 cm | |
220 | Double_t xEndOfAbsorber = trackParamEndOfAbsorber.GetNonBendingCoor(); | |
221 | Double_t yEndOfAbsorber = trackParamEndOfAbsorber.GetBendingCoor(); | |
222 | Double_t rAbsorber = TMath::Sqrt(xEndOfAbsorber*xEndOfAbsorber + yEndOfAbsorber*yEndOfAbsorber); | |
223 | track -> SetRAtAbsorberEnd(rAbsorber); | |
224 | ||
4cc511f4 AU |
225 | //------------------------- NOW THE CYCLE OVER THE MFT PLANES STARTS --------------------------------------- |
226 | ||
227 | for (Int_t iPlane=fNPlanesMFT-1; iPlane>=0; iPlane--) { /* *** do not reverse the order of this cycle!!! | |
228 | *** this reflects the fact that the extrapolation is performed | |
229 | *** starting from the last MFT plane back to the origin */ | |
230 | ||
231 | // --------- updating the array of candidates according to the clusters available in the i-th plane --------- | |
232 | ||
233 | fNPlanesMFTAnalyzed++; | |
234 | ||
235 | Int_t nCandidates = fCandidateTracks->GetEntriesFast(); | |
236 | for (Int_t iCandidate=0; iCandidate<nCandidates; iCandidate++) { | |
237 | fCurrentTrack = (AliMuonForwardTrack*) fCandidateTracks->UncheckedAt(iCandidate); | |
e21f8bf5 | 238 | |
4cc511f4 AU |
239 | // if the old track is compatible with the new cluster, the track is updated and inserted as new track in the array |
240 | // (several new tracks can be created for one old track) | |
241 | if (FindClusterInPlane(iPlane) == kDiverged) { | |
242 | fGlobalTrackingDiverged = kTRUE; | |
243 | break; | |
244 | } | |
245 | ||
246 | if ((fNPlanesMFTAnalyzed-fCurrentTrack->GetNMFTClusters())>fNMaxMissingMFTClusters || fIsPlaneMandatory[iPlane]) { | |
247 | fCandidateTracks->Remove(fCurrentTrack); // the old track is removed after the check; | |
248 | } | |
249 | } | |
250 | if (fGlobalTrackingDiverged) { | |
251 | if (fScaleSigmaClusterCut>0) fScaleSigmaClusterCut -= 0.1; | |
252 | continue; | |
253 | } | |
254 | ||
255 | fCandidateTracks->Compress(); | |
256 | ||
257 | } | |
e21f8bf5 | 258 | |
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259 | // -------------------------- END OF THE CYCLE OVER THE MFT PLANES -------------------------------------------- |
260 | ||
261 | fGlobalTrackingDiverged = kFALSE; | |
262 | fScaleSigmaClusterCut = 1.0; | |
263 | ||
264 | AliDebug(1, "Finished cycle over planes"); | |
265 | ||
266 | iTrack++; | |
267 | ||
268 | // If we have several final tracks, we must find the best candidate: | |
269 | ||
270 | Int_t nFinalTracks = fCandidateTracks->GetEntriesFast(); | |
e21f8bf5 | 271 | AliInfo(Form("nFinalTracks = %d", nFinalTracks)); |
272 | ||
4cc511f4 AU |
273 | Int_t nGoodClustersBestCandidate = 0; |
274 | Int_t idBestCandidate = 0; | |
275 | Double_t bestChi2 = -1.; // variable defining the best candidate | |
276 | ||
277 | for (Int_t iFinalCandidate=0; iFinalCandidate<nFinalTracks; iFinalCandidate++) { | |
278 | ||
279 | AliMuonForwardTrack *finalTrack = (AliMuonForwardTrack*) fCandidateTracks->UncheckedAt(iFinalCandidate); | |
280 | Int_t nMFTClusters = finalTrack->GetNMFTClusters(); | |
281 | ||
282 | Double_t chi2 = 0; | |
283 | for (Int_t iCluster=0; iCluster<nMFTClusters; iCluster++) { | |
284 | AliMFTCluster *localCluster = finalTrack->GetMFTCluster(iCluster); | |
285 | chi2 += localCluster->GetLocalChi2(); | |
286 | } | |
287 | chi2 /= nMFTClusters; | |
288 | ||
289 | // now comparing the tracks in order to find the best one | |
290 | ||
291 | if (chi2<bestChi2 || bestChi2<0) { | |
292 | bestChi2 = chi2; | |
293 | idBestCandidate = iFinalCandidate; | |
294 | } | |
295 | ||
296 | } | |
297 | ||
298 | if (nFinalTracks) { | |
299 | ||
300 | AliMuonForwardTrack *newTrack = (AliMuonForwardTrack*) fCandidateTracks->UncheckedAt(idBestCandidate); | |
301 | newTrack -> SetNWrongClustersMC(newTrack->GetNMFTClusters() - nGoodClustersBestCandidate); | |
302 | ||
e21f8bf5 | 303 | new ((*muonForwardTracks)[muonForwardTracks->GetEntries()]) AliMuonForwardTrack(*newTrack); |
4cc511f4 | 304 | |
e21f8bf5 | 305 | //----------------------- Save the information to the AliESDMuonGlobalTrack object |
306 | ||
307 | newTrack -> EvalKinem(vertex[2]); // we evaluate the kinematics at the primary vertex | |
308 | ||
309 | AliDebug(2,"Creating a new Muon Global Track"); | |
310 | AliESDMuonGlobalTrack *myESDTrack = event->NewMuonGlobalTrack(); | |
311 | myESDTrack -> SetPxPyPz(newTrack->Px(), newTrack->Py(), newTrack->Pz()); | |
026547c6 | 312 | |
313 | // waiting for the commit of the new version of AliESDMuonGlobalTrack... | |
314 | ||
f7cc8591 | 315 | myESDTrack -> SetLabel(newTrack->GetMCLabel()); |
316 | myESDTrack -> SetChi2OverNdf(newTrack->GetChi2OverNdf()); | |
317 | myESDTrack -> SetCharge(newTrack->GetCharge()); | |
318 | myESDTrack -> SetMatchTrigger(newTrack->GetMatchTrigger()); | |
319 | myESDTrack -> SetNMFTClusters(newTrack->GetNMFTClusters()); | |
320 | myESDTrack -> SetNWrongMFTClustersMC(newTrack->GetNWrongClustersMC()); | |
321 | myESDTrack -> SetFirstTrackingPoint(newTrack->GetMFTCluster(0)->GetX(), newTrack->GetMFTCluster(0)->GetY(), newTrack->GetMFTCluster(0)->GetZ()); | |
322 | myESDTrack -> SetXYAtVertex(newTrack->GetOffsetX(vertex[0], vertex[2]), newTrack->GetOffsetX(vertex[1], vertex[2])); | |
323 | myESDTrack -> SetRAtAbsorberEnd(newTrack->GetRAtAbsorberEnd()); | |
324 | myESDTrack -> SetChi2MatchTrigger(esdTrack->GetChi2MatchTrigger()); | |
325 | myESDTrack -> SetMuonClusterMap(esdTrack->GetMuonClusterMap()); | |
326 | myESDTrack -> SetHitsPatternInTrigCh(esdTrack->GetHitsPatternInTrigCh()); | |
327 | myESDTrack -> SetHitsPatternInTrigChTrk(esdTrack->GetHitsPatternInTrigChTrk()); | |
328 | myESDTrack -> Connected(esdTrack->IsConnected()); | |
4cc511f4 | 329 | |
e21f8bf5 | 330 | //--------------------------------------------------------------------------------- |
4cc511f4 AU |
331 | |
332 | } | |
333 | ||
4cc511f4 AU |
334 | fFinalBestCandidate = NULL; |
335 | ||
336 | } | |
337 | ||
e21f8bf5 | 338 | outputTreeMuonGlobalTracks -> Fill(); |
339 | ||
4cc511f4 | 340 | Int_t myEventID = 0; |
4cc511f4 AU |
341 | while (outputFileMuonGlobalTracks->cd(Form("Event%d",myEventID))) myEventID++; |
342 | outputFileMuonGlobalTracks -> mkdir(Form("Event%d",myEventID)); | |
343 | outputFileMuonGlobalTracks -> cd(Form("Event%d",myEventID)); | |
344 | outputTreeMuonGlobalTracks -> Write(); | |
345 | outputFileMuonGlobalTracks -> Close(); | |
346 | ||
e21f8bf5 | 347 | muonForwardTracks -> Delete(); |
348 | delete muonForwardTracks; | |
349 | ||
4cc511f4 AU |
350 | return 0; |
351 | ||
352 | } | |
353 | ||
354 | //========================================================================================================================================= | |
355 | ||
356 | void AliMFTTrackerMU::SeparateFrontBackClusters() { | |
357 | ||
358 | for (Int_t iPlane=0; iPlane<fNPlanesMFT; iPlane++) { | |
359 | fMFTClusterArrayFront[iPlane]->Delete(); | |
360 | fMFTClusterArrayBack[iPlane] ->Delete(); | |
361 | for (Int_t iCluster=0; iCluster<fMFTClusterArray[iPlane]->GetEntries(); iCluster++) { | |
362 | AliMFTCluster *cluster = (AliMFTCluster*) fMFTClusterArray[iPlane]->At(iCluster); | |
363 | if (TMath::Abs(cluster->GetZ())<TMath::Abs(fSegmentation->GetPlane(iPlane)->GetZCenter())) { | |
364 | new ((*fMFTClusterArrayFront[iPlane])[fMFTClusterArrayFront[iPlane]->GetEntries()]) AliMFTCluster(*cluster); | |
365 | } | |
366 | else { | |
367 | new ((*fMFTClusterArrayBack[iPlane])[fMFTClusterArrayBack[iPlane]->GetEntries()]) AliMFTCluster(*cluster); | |
368 | } | |
369 | } | |
370 | } | |
371 | ||
372 | } | |
373 | ||
374 | //========================================================================================================================================== | |
375 | ||
376 | Int_t AliMFTTrackerMU::FindClusterInPlane(Int_t planeId) { | |
377 | ||
4cc511f4 AU |
378 | // !!!!!!!!! coordinates and errors on the interaction vertex should be taken from the event itself (ITS) if available |
379 | ||
380 | // propagate track to plane #planeId (both to front and back active sensors) | |
381 | // look for compatible clusters | |
382 | // update TrackParam at found cluster (if any) using Kalman Filter | |
383 | ||
384 | AliMUONTrackParam currentParamFront, currentParamBack, currentParamForResearchFront, currentParamForResearchBack; | |
385 | ||
386 | if (planeId == fNPlanesMFT-1) { // last plane of the telecope | |
387 | currentParamFront = (*((AliMUONTrackParam*)(fMUONTrack->GetTrackParamAtCluster()->First()))); | |
388 | currentParamBack = (*((AliMUONTrackParam*)(fMUONTrack->GetTrackParamAtCluster()->First()))); | |
389 | currentParamForResearchFront = currentParamFront; | |
390 | currentParamForResearchBack = currentParamBack; | |
391 | Double_t xExtrap = gRandom->Gaus(0,fVertexErrorX); | |
392 | Double_t yExtrap = gRandom->Gaus(0,fVertexErrorY); | |
393 | Double_t zExtrap = gRandom->Gaus(0,fVertexErrorZ); | |
394 | if (fBransonCorrection) { | |
395 | AliMUONTrackExtrap::ExtrapToVertex(¤tParamFront, xExtrap, yExtrap, zExtrap, fVertexErrorX, fVertexErrorY); | |
396 | AliMUONTrackExtrap::ExtrapToVertex(¤tParamBack, xExtrap, yExtrap, zExtrap, fVertexErrorX, fVertexErrorY); | |
397 | } | |
398 | else { | |
399 | AliMUONTrackExtrap::ExtrapToVertexWithoutBranson(¤tParamFront, zExtrap); | |
400 | AliMUONTrackExtrap::ExtrapToVertexWithoutBranson(¤tParamBack, zExtrap); | |
401 | } | |
402 | AliMUONTrackExtrap::ExtrapToVertex(¤tParamForResearchFront, xExtrap, yExtrap, zExtrap, fVertexErrorX, fVertexErrorY); | |
403 | AliMUONTrackExtrap::ExtrapToVertex(¤tParamForResearchBack, xExtrap, yExtrap, zExtrap, fVertexErrorX, fVertexErrorY); | |
404 | } | |
405 | else { // MFT planes others than the last one: mult. scattering correction because of the upstream MFT planes is performed | |
406 | currentParamFront = (*((AliMUONTrackParam*)(fCurrentTrack->GetTrackParamAtCluster()->First()))); | |
407 | currentParamBack = (*((AliMUONTrackParam*)(fCurrentTrack->GetTrackParamAtCluster()->First()))); | |
408 | currentParamForResearchFront = currentParamFront; | |
409 | currentParamForResearchBack = currentParamBack; | |
410 | AliMUONTrackExtrap::AddMCSEffect(¤tParamFront, (fSegmentation->GetPlane(planeId+1)->GetEquivalentSilicon()+ | |
411 | fSegmentation->GetPlane(planeId)->GetEquivalentSiliconBeforeFront())/fRadLengthSi,-1.); | |
412 | AliMUONTrackExtrap::AddMCSEffect(¤tParamForResearchFront,(fSegmentation->GetPlane(planeId+1)->GetEquivalentSilicon()+ | |
413 | fSegmentation->GetPlane(planeId)->GetEquivalentSiliconBeforeFront())/fRadLengthSi,-1.); | |
414 | AliMUONTrackExtrap::AddMCSEffect(¤tParamBack, (fSegmentation->GetPlane(planeId+1)->GetEquivalentSilicon()+ | |
415 | fSegmentation->GetPlane(planeId)->GetEquivalentSiliconBeforeBack())/fRadLengthSi,-1.); | |
416 | AliMUONTrackExtrap::AddMCSEffect(¤tParamForResearchBack, (fSegmentation->GetPlane(planeId+1)->GetEquivalentSilicon()+ | |
417 | fSegmentation->GetPlane(planeId)->GetEquivalentSiliconBeforeBack())/fRadLengthSi,-1.); | |
418 | } | |
419 | // for all planes: extrapolation to the Z of the plane | |
420 | AliMUONTrackExtrap::ExtrapToZCov(¤tParamFront, -1.*fSegmentation->GetPlane(planeId)->GetZCenterActiveFront()); | |
421 | AliMUONTrackExtrap::ExtrapToZCov(¤tParamForResearchFront, -1.*fSegmentation->GetPlane(planeId)->GetZCenterActiveFront()); | |
422 | AliMUONTrackExtrap::ExtrapToZCov(¤tParamBack, -1.*fSegmentation->GetPlane(planeId)->GetZCenterActiveBack()); | |
423 | AliMUONTrackExtrap::ExtrapToZCov(¤tParamForResearchBack, -1.*fSegmentation->GetPlane(planeId)->GetZCenterActiveBack()); | |
424 | ||
425 | //--------------------------------------------------------------------------------------- | |
426 | ||
427 | TMatrixD covFront(5,5); covFront = currentParamForResearchFront.GetCovariances(); | |
428 | TMatrixD covBack(5,5); covBack = currentParamForResearchBack.GetCovariances(); | |
429 | ||
430 | Double_t squaredError_X_Front = covFront(0,0); | |
431 | Double_t squaredError_Y_Front = covFront(2,2); | |
432 | Double_t squaredError_X_Back = covBack(0,0); | |
433 | Double_t squaredError_Y_Back = covBack(2,2); | |
434 | ||
435 | Double_t corrFact = 1.0; | |
436 | ||
437 | Double_t researchRadiusFront = TMath::Sqrt(squaredError_X_Front + squaredError_Y_Front); | |
438 | Double_t researchRadiusBack = TMath::Sqrt(squaredError_X_Back + squaredError_Y_Back); | |
439 | if (0.5*(researchRadiusFront+researchRadiusBack)<fMinResearchRadiusAtPlane[planeId]) { | |
440 | corrFact = fMinResearchRadiusAtPlane[planeId]/(0.5*(researchRadiusFront+researchRadiusBack)); | |
441 | } | |
442 | ||
443 | //--------------------------------------------------------------------------------------- | |
444 | ||
445 | Double_t chi2cut = 2.*fScaleSigmaClusterCut*fScaleSigmaClusterCut*fSigmaClusterCut*fSigmaClusterCut; // depends on the number of variables (here, 2) | |
446 | ||
447 | // Analyizing the clusters: FRONT ACTIVE ELEMENTS | |
448 | ||
449 | Int_t nClustersFront = fMFTClusterArrayFront[planeId]->GetEntries(); | |
450 | AliDebug(2, Form("There are %3d clusters in plane %02d FRONT\n", nClustersFront, planeId)); | |
451 | ||
452 | for (Int_t iCluster=0; iCluster<nClustersFront; iCluster++) { | |
453 | ||
454 | Bool_t isGoodChi2 = kFALSE; | |
455 | ||
456 | AliMFTCluster *cluster = (AliMFTCluster*) fMFTClusterArrayFront[planeId]->At(iCluster); | |
457 | Double_t chi2 = (1./(corrFact*corrFact)) * TryOneCluster(currentParamForResearchFront, cluster); // describes the compatibility between the track and the cluster | |
458 | if (chi2<chi2cut) isGoodChi2 = kTRUE; | |
459 | ||
460 | if (isGoodChi2) { | |
461 | AliDebug(3, Form("accepting cluster: chi2=%f (cut = %f)\n", chi2, chi2cut)); | |
462 | AliMuonForwardTrack *newTrack = new ((*fCandidateTracks)[fCandidateTracks->GetEntriesFast()]) AliMuonForwardTrack(*fCurrentTrack); | |
463 | if (fCandidateTracks->GetEntriesFast() > fMaxNCandidates) return kDiverged; | |
464 | newTrack->AddTrackParamAtMFTCluster(currentParamFront, *cluster); // creating new track param and attaching the cluster | |
465 | AliDebug(2, Form("After plane %02d: newTrack->GetNMFTClusters() = %d (fCurrentTrack->GetNMFTClusters() = %d)", | |
466 | planeId, newTrack->GetNMFTClusters(), fCurrentTrack->GetNMFTClusters())); | |
467 | newTrack->SetPlaneExists(planeId); | |
468 | } | |
469 | else AliDebug(3, Form("discarding cluster: chi2=%f (cut = %f)\n", chi2, chi2cut)); | |
470 | ||
471 | } | |
472 | ||
473 | // Analyizing the clusters: BACK ACTIVE ELEMENTS | |
474 | ||
475 | Int_t nClustersBack = fMFTClusterArrayBack[planeId]->GetEntries(); | |
476 | AliDebug(2, Form("There are %3d clusters in plane %02d BACK\n", nClustersBack, planeId)); | |
477 | ||
478 | for (Int_t iCluster=0; iCluster<nClustersBack; iCluster++) { | |
479 | ||
480 | Bool_t isGoodChi2 = kFALSE; | |
481 | ||
482 | AliMFTCluster *cluster = (AliMFTCluster*) fMFTClusterArrayBack[planeId]->At(iCluster); | |
483 | Double_t chi2 = (1./(corrFact*corrFact)) * TryOneCluster(currentParamForResearchBack, cluster); // describes the compatibility between the track and the cluster | |
484 | if (chi2<chi2cut) isGoodChi2 = kTRUE; | |
485 | ||
486 | if (isGoodChi2) { | |
487 | AliDebug(3,Form("accepting cluster: chi2=%f (cut = %f)\n", chi2, chi2cut)); | |
488 | AliMuonForwardTrack *newTrack = new ((*fCandidateTracks)[fCandidateTracks->GetEntriesFast()]) AliMuonForwardTrack(*fCurrentTrack); | |
489 | if (fCandidateTracks->GetEntriesFast() > fMaxNCandidates) return kDiverged; | |
490 | newTrack->AddTrackParamAtMFTCluster(currentParamBack, *cluster); // creating new track param and attaching the cluster | |
491 | AliDebug(2, Form("After plane %02d: newTrack->GetNMFTClusters() = %d (fCurrentTrack->GetNMFTClusters() = %d)", | |
492 | planeId, newTrack->GetNMFTClusters(), fCurrentTrack->GetNMFTClusters())); | |
493 | newTrack->SetPlaneExists(planeId); | |
494 | } | |
495 | else AliDebug(3,Form("discarding cluster: chi2=%f (cut = %f)\n", chi2, chi2cut)); | |
496 | ||
497 | } | |
498 | ||
499 | //--------------------------------------------------------------------------------------------- | |
500 | ||
501 | return kConverged; | |
502 | ||
503 | } | |
504 | ||
505 | //========================================================================================================================================== | |
506 | ||
507 | Double_t AliMFTTrackerMU::TryOneCluster(const AliMUONTrackParam &trackParam, AliMFTCluster *cluster) { | |
508 | ||
509 | // Test the compatibility between the track and the cluster (using trackParam's covariance matrix): | |
510 | // return the corresponding Chi2 | |
511 | // assume the track parameters are given at the Z of the cluster | |
512 | ||
513 | // Set differences between trackParam and cluster in the bending and non bending directions | |
514 | Double_t dX = cluster->GetX() - trackParam.GetNonBendingCoor(); | |
515 | Double_t dY = cluster->GetY() - trackParam.GetBendingCoor(); | |
516 | AliDebug(3,Form("dX = %f, dY = %f\n", dX, dY)); | |
517 | ||
518 | // Calculate errors and covariances | |
519 | const TMatrixD& kParamCov = trackParam.GetCovariances(); | |
520 | Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2(); | |
521 | Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2(); | |
522 | AliDebug(3, Form("dX2 = %f, dY2 = %f\n", sigmaX2, sigmaY2)); | |
523 | Double_t covXY = kParamCov(0,2); | |
524 | Double_t det = sigmaX2 * sigmaY2 - covXY * covXY; | |
525 | ||
526 | // Compute chi2 | |
527 | if (det==0.) return 1.e10; | |
528 | return (dX*dX*sigmaY2 + dY*dY*sigmaX2 - 2.*dX*dY*covXY) / det; | |
529 | ||
530 | } | |
531 | ||
532 | //========================================================================================================================================= | |
533 |