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8d0843c6 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
3d1463c8 | 18 | //----------------------------------------------------------------------------- |
c4ee792d | 19 | /// \class AliMUONVTrackReconstructor |
06ca6d7b | 20 | /// Virtual MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor) |
21 | /// | |
96ebe67e | 22 | /// This class contains as data a pointer to the array of reconstructed tracks |
06ca6d7b | 23 | /// |
24 | /// It contains as methods, among others: | |
25 | /// * EventReconstruct to build the muon tracks | |
26 | /// * EventReconstructTrigger to build the trigger tracks | |
96ebe67e | 27 | /// * ValidateTracksWithTrigger to match tracker/trigger tracks |
06ca6d7b | 28 | /// |
96ebe67e | 29 | /// Several options and adjustable parameters are available for both KALMAN and ORIGINAL |
ad3c6eda | 30 | /// tracking algorithms. They can be changed through the AliMUONRecoParam object |
31 | /// set in the reconstruction macro or read from the CDB | |
32 | /// (see methods in AliMUONRecoParam.h file for details) | |
96ebe67e | 33 | /// |
34 | /// Main parameters and options are: | |
dfb547bf | 35 | /// - *fgkSigmaToCutForTracking* : quality cut used to select new clusters to be |
36 | /// attached to the track candidate and to select good tracks. | |
019df241 | 37 | /// - *fgkMakeTrackCandidatesFast* : if this flag is set to 'true', the track candidates |
38 | /// are made assuming linear propagation between stations 4 and 5. | |
dfb547bf | 39 | /// - *fgkTrackAllTracks* : according to the value of this flag, in case that several |
40 | /// new clusters pass the quality cut, either we consider all the possibilities | |
41 | /// (duplicating tracks) or we attach only the best cluster. | |
42 | /// - *fgkRecoverTracks* : if this flag is set to 'true', we try to recover the tracks | |
43 | /// lost during the tracking by removing the worst of the 2 clusters attached in the | |
44 | /// previous station. | |
45 | /// - *fgkImproveTracks* : if this flag is set to 'true', we try to improve the quality | |
46 | /// of the tracks at the end of the tracking by removing clusters that do not pass | |
3304fa09 | 47 | /// new quality cut (the track is removed is it does not contain enough cluster anymore). |
48 | /// - *fgkComplementTracks* : if this flag is set to 'true', we try to improve the quality | |
49 | /// of the tracks at the end of the tracking by adding potentially missing clusters | |
50 | /// (we may have 2 clusters in the same chamber because of the overlapping of detection | |
51 | /// elements, which is not handle by the tracking algorithm). | |
dfb547bf | 52 | /// - *fgkSigmaToCutForImprovement* : quality cut used when we try to improve the |
53 | /// quality of the tracks. | |
54 | /// | |
c4ee792d | 55 | /// \author Philippe Pillot |
3d1463c8 | 56 | //----------------------------------------------------------------------------- |
8d0843c6 | 57 | |
8d0843c6 | 58 | #include "AliMUONVTrackReconstructor.h" |
7ec3b9cf | 59 | |
8d0843c6 | 60 | #include "AliMUONConstants.h" |
208f139e | 61 | #include "AliMUONObjectPair.h" |
8d0843c6 | 62 | #include "AliMUONTriggerTrack.h" |
e1a10d41 | 63 | #include "AliMUONTriggerCircuit.h" |
8d0843c6 | 64 | #include "AliMUONLocalTrigger.h" |
65 | #include "AliMUONGlobalTrigger.h" | |
8d0843c6 | 66 | #include "AliMUONTrack.h" |
37827b29 | 67 | #include "AliMUONTrackParam.h" |
68 | #include "AliMUONTrackExtrap.h" | |
7771752e | 69 | #include "AliMUONTrackHitPattern.h" |
7ec3b9cf | 70 | #include "AliMUONVTrackStore.h" |
71 | #include "AliMUONVClusterStore.h" | |
2060b217 | 72 | #include "AliMUONVCluster.h" |
1fef78c8 | 73 | #include "AliMUONVClusterServer.h" |
7ec3b9cf | 74 | #include "AliMUONVTriggerStore.h" |
75 | #include "AliMUONVTriggerTrackStore.h" | |
5a240757 | 76 | #include "AliMUONRecoParam.h" |
77 | ||
ea94c18b | 78 | #include "AliMpDEManager.h" |
1fef78c8 | 79 | #include "AliMpArea.h" |
ea94c18b | 80 | |
bdfb6eef | 81 | #include "AliMpDDLStore.h" |
82 | #include "AliMpVSegmentation.h" | |
83 | #include "AliMpSegmentation.h" | |
84 | #include "AliMpPad.h" | |
85 | ||
ea94c18b | 86 | #include "AliLog.h" |
b709ac13 | 87 | #include "AliCodeTimer.h" |
ea94c18b | 88 | #include "AliTracker.h" |
8d0843c6 | 89 | |
4889d34c | 90 | #include <TClonesArray.h> |
91 | #include <TMath.h> | |
ea94c18b | 92 | #include <TMatrixD.h> |
1fef78c8 | 93 | #include <TVector2.h> |
ea94c18b | 94 | |
95 | #include <Riostream.h> | |
4889d34c | 96 | |
b80faac0 | 97 | using std::cout; |
98 | using std::endl; | |
78649106 | 99 | /// \cond CLASSIMP |
8d0843c6 | 100 | ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context |
78649106 | 101 | /// \endcond |
8d0843c6 | 102 | |
ea94c18b | 103 | //__________________________________________________________________________ |
a0dc65b4 | 104 | AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam, |
105 | AliMUONVClusterServer* clusterServer) | |
106 | : TObject(), | |
107 | fRecTracksPtr(0x0), | |
108 | fNRecTracks(0), | |
109 | fClusterServer(clusterServer), | |
6b191dea | 110 | fkRecoParam(recoParam), |
4663da9f | 111 | fMaxMCSAngle2(0x0) |
8d0843c6 | 112 | { |
113 | /// Constructor for class AliMUONVTrackReconstructor | |
b1fea02e | 114 | /// WARNING: if clusterServer=0x0, no clusterization will be possible at this level |
ea94c18b | 115 | |
116 | // Memory allocation for the TClonesArray of reconstructed tracks | |
96ebe67e | 117 | fRecTracksPtr = new TClonesArray("AliMUONTrack", 100); |
7ec3b9cf | 118 | |
208f139e | 119 | // set the magnetic field for track extrapolations |
f7a1cc68 | 120 | AliMUONTrackExtrap::SetField(); |
6b191dea | 121 | |
122 | // set the maximum MCS angle in chamber from the minimum acceptable momentum | |
123 | AliMUONTrackParam param; | |
124 | Double_t inverseBendingP = (GetRecoParam()->GetMinBendingMomentum() > 0.) ? 1./GetRecoParam()->GetMinBendingMomentum() : 1.; | |
125 | param.SetInverseBendingMomentum(inverseBendingP); | |
4663da9f | 126 | fMaxMCSAngle2 = new Double_t [AliMUONConstants::NTrackingCh()]; |
127 | for (Int_t iCh=0; iCh<AliMUONConstants::NTrackingCh(); iCh++) | |
128 | fMaxMCSAngle2[iCh] = AliMUONTrackExtrap::GetMCSAngle2(param, AliMUONConstants::ChamberThicknessInX0(iCh), 1.); | |
6b191dea | 129 | |
8d0843c6 | 130 | } |
131 | ||
132 | //__________________________________________________________________________ | |
ea94c18b | 133 | AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor() |
8d0843c6 | 134 | { |
135 | /// Destructor for class AliMUONVTrackReconstructor | |
ea94c18b | 136 | delete fRecTracksPtr; |
4663da9f | 137 | delete[] fMaxMCSAngle2; |
8d0843c6 | 138 | } |
139 | ||
ea94c18b | 140 | //__________________________________________________________________________ |
141 | void AliMUONVTrackReconstructor::ResetTracks() | |
142 | { | |
143 | /// To reset the TClonesArray of reconstructed tracks | |
144 | if (fRecTracksPtr) fRecTracksPtr->Clear("C"); | |
145 | fNRecTracks = 0; | |
146 | return; | |
147 | } | |
148 | ||
149 | //__________________________________________________________________________ | |
1fef78c8 | 150 | void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore) |
ea94c18b | 151 | { |
152 | /// To reconstruct one event | |
153 | AliDebug(1,""); | |
99c136e1 | 154 | AliCodeTimerAuto("",0); |
ea94c18b | 155 | |
96ebe67e | 156 | // Reset array of tracks |
ea94c18b | 157 | ResetTracks(); |
2060b217 | 158 | |
89c8d66d | 159 | // Look for candidates from clusters in stations(1..) 4 and 5 (abort in case of failure) |
160 | if (!MakeTrackCandidates(clusterStore)) return; | |
96ebe67e | 161 | |
89c8d66d | 162 | // Look for extra candidates from clusters in stations(1..) 4 and 5 (abort in case of failure) |
163 | if (GetRecoParam()->MakeMoreTrackCandidates()) { | |
164 | if (!MakeMoreTrackCandidates(clusterStore)) return; | |
165 | } | |
9bf6860b | 166 | |
96ebe67e | 167 | // Stop tracking if no candidate found |
ea94c18b | 168 | if (fRecTracksPtr->GetEntriesFast() == 0) return; |
96ebe67e | 169 | |
89c8d66d | 170 | // Follow tracks in stations(1..) 3, 2 and 1 (abort in case of failure) |
171 | if (!FollowTracks(clusterStore)) return; | |
96ebe67e | 172 | |
b709ac13 | 173 | // Complement the reconstructed tracks |
89c8d66d | 174 | if (GetRecoParam()->ComplementTracks()) { |
175 | if (ComplementTracks(clusterStore)) RemoveIdenticalTracks(); | |
176 | } | |
96ebe67e | 177 | |
ea94c18b | 178 | // Improve the reconstructed tracks |
a0dc65b4 | 179 | if (GetRecoParam()->ImproveTracks()) ImproveTracks(); |
96ebe67e | 180 | |
c59f70b9 | 181 | // Remove connected tracks |
5c15a68b | 182 | RemoveConnectedTracks(3, 4, kFALSE); |
183 | RemoveConnectedTracks(2, 2, kFALSE); | |
184 | if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(0, 1, kFALSE); | |
96ebe67e | 185 | |
ea94c18b | 186 | // Fill AliMUONTrack data members |
187 | Finalize(); | |
5c15a68b | 188 | if (!GetRecoParam()->RemoveConnectedTracksInSt12()) TagConnectedTracks(0, 1, kTRUE); |
96ebe67e | 189 | |
190 | // Add tracks to MUON data container | |
5c15a68b | 191 | for (Int_t i=0; i<fNRecTracks; ++i) |
96ebe67e | 192 | { |
193 | AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i); | |
4ea3f013 | 194 | if (track->GetGlobalChi2() < AliMUONTrack::MaxChi2()) { |
195 | track->SetUniqueID(i+1); | |
196 | trackStore.Add(*track); | |
197 | } else AliWarning("problem occur somewhere during track refitting --> discard track"); | |
96ebe67e | 198 | } |
ea94c18b | 199 | } |
200 | ||
6b191dea | 201 | //__________________________________________________________________________ |
202 | Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam) | |
203 | { | |
204 | /// Return kTRUE if the track is within given limits on momentum/angle/origin | |
205 | ||
206 | const TMatrixD& kParamCov = trackParam.GetCovariances(); | |
207 | Int_t chamber = trackParam.GetClusterPtr()->GetChamberId(); | |
208 | Double_t z = trackParam.GetZ(); | |
209 | Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking(); | |
210 | ||
211 | // MCS dipersion | |
212 | Double_t angleMCS2 = 0.; | |
6b191dea | 213 | Double_t impactMCS2 = 0.; |
4663da9f | 214 | if (AliMUONTrackExtrap::IsFieldON() && chamber < 6) { |
215 | ||
216 | // track momentum is known | |
217 | for (Int_t iCh=0; iCh<=chamber; iCh++) { | |
218 | Double_t localMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(iCh), 1.); | |
219 | angleMCS2 += localMCS2; | |
220 | impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * localMCS2; | |
221 | } | |
222 | ||
223 | } else { | |
224 | ||
225 | // track momentum is unknown | |
226 | for (Int_t iCh=0; iCh<=chamber; iCh++) { | |
227 | angleMCS2 += fMaxMCSAngle2[iCh]; | |
228 | impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * fMaxMCSAngle2[iCh]; | |
229 | } | |
230 | ||
231 | } | |
6b191dea | 232 | |
233 | // ------ track selection in non bending direction ------ | |
234 | if (GetRecoParam()->SelectOnTrackSlope()) { | |
235 | ||
236 | // check if non bending slope is within tolerances | |
4663da9f | 237 | Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + angleMCS2); |
6b191dea | 238 | if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE; |
239 | ||
240 | } else { | |
241 | ||
242 | // or check if non bending impact parameter is within tolerances | |
243 | Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope()); | |
244 | Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2); | |
245 | if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE; | |
246 | ||
247 | } | |
248 | ||
249 | // ------ track selection in bending direction ------ | |
250 | if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF | |
251 | ||
252 | // check if bending momentum is within tolerances | |
253 | Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum()); | |
254 | Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum; | |
255 | if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE; | |
256 | else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE; | |
257 | ||
258 | } else { | |
259 | ||
260 | if (GetRecoParam()->SelectOnTrackSlope()) { | |
261 | ||
262 | // check if bending slope is within tolerances | |
4663da9f | 263 | Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + angleMCS2); |
6b191dea | 264 | if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE; |
265 | ||
266 | } else { | |
267 | ||
268 | // or check if bending impact parameter is within tolerances | |
269 | Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope()); | |
270 | Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2); | |
271 | if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE; | |
272 | ||
273 | } | |
274 | ||
275 | } | |
276 | ||
277 | return kTRUE; | |
278 | ||
279 | } | |
280 | ||
281 | //__________________________________________________________________________ | |
9bf6860b | 282 | TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2) |
8d0843c6 | 283 | { |
9bf6860b | 284 | /// To make the list of segments from the list of clusters in the 2 given chambers. |
d544b5a6 | 285 | /// Return a TClonesArray of new segments (segments made in a previous call of this function are removed). |
9bf6860b | 286 | AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1)); |
99c136e1 | 287 | AliCodeTimerAuto("",0); |
208f139e | 288 | |
96ebe67e | 289 | AliMUONVCluster *cluster1, *cluster2; |
208f139e | 290 | AliMUONObjectPair *segment; |
6b191dea | 291 | Double_t z1 = 0., z2 = 0., dZ = 0.; |
292 | Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.; | |
293 | Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.; | |
294 | Double_t bendingMomentum = 0., bendingMomentumErr = 0.; | |
295 | Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion(); | |
4663da9f | 296 | Double_t angleMCS2 = 0.; // maximum angular dispersion**2 due to MCS in chamber |
297 | Double_t impactMCS2 = 0.; // maximum impact parameter dispersion**2 due to MCS in chamber | |
298 | for (Int_t iCh=0; iCh<=ch1; iCh++) { | |
299 | angleMCS2 += fMaxMCSAngle2[iCh]; | |
300 | impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2[iCh]; | |
301 | } | |
6b191dea | 302 | Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking(); |
7ec3b9cf | 303 | |
96ebe67e | 304 | // Create iterators to loop over clusters in both chambers |
305 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
306 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
307 | ||
208f139e | 308 | // list of segments |
d544b5a6 | 309 | static TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100); |
310 | segments->Clear("C"); | |
7ec3b9cf | 311 | |
96ebe67e | 312 | // Loop over clusters in the first chamber of the station |
313 | while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
6b191dea | 314 | z1 = cluster1->GetZ(); |
96ebe67e | 315 | |
316 | // reset cluster iterator of chamber 2 | |
317 | nextInCh2.Reset(); | |
318 | ||
319 | // Loop over clusters in the second chamber of the station | |
320 | while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
6b191dea | 321 | z2 = cluster2->GetZ(); |
322 | dZ = z1 - z2; | |
96ebe67e | 323 | |
6b191dea | 324 | // ------ track selection in non bending direction ------ |
325 | nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ; | |
326 | if (GetRecoParam()->SelectOnTrackSlope()) { | |
9f093251 | 327 | |
6b191dea | 328 | // check if non bending slope is within tolerances |
4663da9f | 329 | nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + angleMCS2); |
6b191dea | 330 | if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue; |
9f093251 | 331 | |
6b191dea | 332 | } else { |
333 | ||
334 | // or check if non bending impact parameter is within tolerances | |
335 | nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope); | |
336 | nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2); | |
337 | if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue; | |
338 | ||
339 | } | |
340 | ||
341 | // ------ track selection in bending direction ------ | |
342 | bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ; | |
343 | if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF | |
9f093251 | 344 | |
345 | // check if bending momentum is within tolerances | |
6b191dea | 346 | bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope; |
347 | bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2; | |
348 | bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam)); | |
349 | bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) / | |
350 | bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum; | |
351 | if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue; | |
96ebe67e | 352 | |
9f093251 | 353 | } else { |
354 | ||
6b191dea | 355 | if (GetRecoParam()->SelectOnTrackSlope()) { |
356 | ||
357 | // check if bending slope is within tolerances | |
4663da9f | 358 | bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + angleMCS2); |
6b191dea | 359 | if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue; |
360 | ||
361 | } else { | |
362 | ||
363 | // or check if bending impact parameter is within tolerances | |
364 | bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope); | |
365 | bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2); | |
366 | if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue; | |
367 | ||
368 | } | |
369 | ||
9f093251 | 370 | } |
6b191dea | 371 | |
9f093251 | 372 | // make new segment |
373 | segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE); | |
374 | ||
375 | // Printout for debug | |
376 | if (AliLog::GetGlobalDebugLevel() > 1) { | |
377 | cout << "segmentIndex(0...): " << segments->GetLast() << endl; | |
378 | segment->Dump(); | |
379 | cout << "Cluster in first chamber" << endl; | |
380 | cluster1->Print(); | |
381 | cout << "Cluster in second chamber" << endl; | |
382 | cluster2->Print(); | |
8d0843c6 | 383 | } |
96ebe67e | 384 | |
385 | } | |
386 | ||
387 | } | |
388 | ||
389 | // Printout for debug | |
9bf6860b | 390 | AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast())); |
96ebe67e | 391 | |
208f139e | 392 | return segments; |
8d0843c6 | 393 | } |
394 | ||
89c8d66d | 395 | //__________________________________________________________________________ |
396 | void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments) | |
397 | { | |
398 | /// To remove pairs of clusters already attached to a track | |
399 | AliDebug(1,"Enter RemoveUsedSegments"); | |
400 | Int_t nSegments = segments.GetEntriesFast(); | |
401 | Int_t nTracks = fRecTracksPtr->GetEntriesFast(); | |
402 | AliMUONObjectPair *segment; | |
403 | AliMUONTrack *track; | |
404 | AliMUONVCluster *cluster, *cluster1, *cluster2; | |
405 | Bool_t foundCluster1, foundCluster2, removeSegment; | |
406 | ||
407 | // Loop over segments | |
408 | for (Int_t iSegment=0; iSegment<nSegments; iSegment++) { | |
409 | segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment); | |
410 | ||
411 | cluster1 = (AliMUONVCluster*) segment->First(); | |
412 | cluster2 = (AliMUONVCluster*) segment->Second(); | |
413 | removeSegment = kFALSE; | |
414 | ||
415 | // Loop over tracks | |
416 | for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) { | |
417 | track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack); | |
418 | ||
419 | // skip empty slot | |
420 | if (!track) continue; | |
421 | ||
422 | foundCluster1 = kFALSE; | |
423 | foundCluster2 = kFALSE; | |
424 | ||
425 | // Loop over clusters | |
426 | Int_t nClusters = track->GetNClusters(); | |
427 | for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) { | |
428 | cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr(); | |
429 | ||
430 | // check if both clusters are in that track | |
431 | if (cluster == cluster1) foundCluster1 = kTRUE; | |
432 | else if (cluster == cluster2) foundCluster2 = kTRUE; | |
433 | ||
434 | if (foundCluster1 && foundCluster2) { | |
435 | removeSegment = kTRUE; | |
436 | break; | |
437 | } | |
438 | ||
439 | } | |
440 | ||
441 | if (removeSegment) break; | |
442 | ||
443 | } | |
444 | ||
445 | if (removeSegment) segments.RemoveAt(iSegment); | |
446 | ||
447 | } | |
448 | ||
449 | segments.Compress(); | |
450 | ||
451 | // Printout for debug | |
452 | AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast())); | |
453 | } | |
454 | ||
ea94c18b | 455 | //__________________________________________________________________________ |
456 | void AliMUONVTrackReconstructor::RemoveIdenticalTracks() | |
457 | { | |
458 | /// To remove identical tracks: | |
96ebe67e | 459 | /// Tracks are considered identical if they have all their clusters in common. |
460 | /// One keeps the track with the larger number of clusters if need be | |
89c8d66d | 461 | AliMUONTrack *track1, *track2; |
462 | Int_t nTracks = fRecTracksPtr->GetEntriesFast(); | |
96ebe67e | 463 | Int_t clustersInCommon, nClusters1, nClusters2; |
ea94c18b | 464 | // Loop over first track of the pair |
89c8d66d | 465 | for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) { |
466 | track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1); | |
467 | // skip empty slot | |
468 | if (!track1) continue; | |
96ebe67e | 469 | nClusters1 = track1->GetNClusters(); |
ea94c18b | 470 | // Loop over second track of the pair |
89c8d66d | 471 | for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) { |
472 | track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2); | |
473 | // skip empty slot | |
474 | if (!track2) continue; | |
96ebe67e | 475 | nClusters2 = track2->GetNClusters(); |
476 | // number of clusters in common between two tracks | |
477 | clustersInCommon = track1->ClustersInCommon(track2); | |
ea94c18b | 478 | // check for identical tracks |
96ebe67e | 479 | if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) { |
ea94c18b | 480 | // decide which track to remove |
96ebe67e | 481 | if (nClusters2 > nClusters1) { |
ea94c18b | 482 | // remove track1 and continue the first loop with the track next to track1 |
89c8d66d | 483 | fRecTracksPtr->RemoveAt(iTrack1); |
ea94c18b | 484 | fNRecTracks--; |
ea94c18b | 485 | break; |
486 | } else { | |
487 | // remove track2 and continue the second loop with the track next to track2 | |
89c8d66d | 488 | fRecTracksPtr->RemoveAt(iTrack2); |
ea94c18b | 489 | fNRecTracks--; |
490 | } | |
89c8d66d | 491 | } |
ea94c18b | 492 | } // track2 |
ea94c18b | 493 | } // track1 |
89c8d66d | 494 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards |
ea94c18b | 495 | } |
496 | ||
497 | //__________________________________________________________________________ | |
498 | void AliMUONVTrackReconstructor::RemoveDoubleTracks() | |
499 | { | |
500 | /// To remove double tracks: | |
96ebe67e | 501 | /// Tracks are considered identical if more than half of the clusters of the track |
502 | /// which has the smaller number of clusters are in common with the other track. | |
503 | /// Among two identical tracks, one keeps the track with the larger number of clusters | |
ea94c18b | 504 | /// or, if these numbers are equal, the track with the minimum chi2. |
89c8d66d | 505 | AliMUONTrack *track1, *track2; |
506 | Int_t nTracks = fRecTracksPtr->GetEntriesFast(); | |
507 | Int_t clustersInCommon2, nClusters1, nClusters2; | |
ea94c18b | 508 | // Loop over first track of the pair |
89c8d66d | 509 | for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) { |
510 | track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1); | |
511 | // skip empty slot | |
512 | if (!track1) continue; | |
96ebe67e | 513 | nClusters1 = track1->GetNClusters(); |
ea94c18b | 514 | // Loop over second track of the pair |
89c8d66d | 515 | for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) { |
516 | track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2); | |
517 | // skip empty slot | |
518 | if (!track2) continue; | |
96ebe67e | 519 | nClusters2 = track2->GetNClusters(); |
520 | // number of clusters in common between two tracks | |
89c8d66d | 521 | clustersInCommon2 = 2 * track1->ClustersInCommon(track2); |
ea94c18b | 522 | // check for identical tracks |
89c8d66d | 523 | if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) { |
ea94c18b | 524 | // decide which track to remove |
96ebe67e | 525 | if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) { |
ea94c18b | 526 | // remove track2 and continue the second loop with the track next to track2 |
89c8d66d | 527 | fRecTracksPtr->RemoveAt(iTrack2); |
c59f70b9 | 528 | fNRecTracks--; |
529 | } else { | |
530 | // else remove track1 and continue the first loop with the track next to track1 | |
89c8d66d | 531 | fRecTracksPtr->RemoveAt(iTrack1); |
c59f70b9 | 532 | fNRecTracks--; |
c59f70b9 | 533 | break; |
534 | } | |
89c8d66d | 535 | } |
c59f70b9 | 536 | } // track2 |
c59f70b9 | 537 | } // track1 |
89c8d66d | 538 | fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards |
c59f70b9 | 539 | } |
540 | ||
541 | //__________________________________________________________________________ | |
5c15a68b | 542 | void AliMUONVTrackReconstructor::RemoveConnectedTracks(Int_t stMin, Int_t stMax, Bool_t all) |
c59f70b9 | 543 | { |
5c15a68b | 544 | /// Find and remove tracks sharing 1 cluster or more in station(s) [stMin, stMax]. |
545 | /// For each couple of connected tracks, one removes the one with the smallest | |
546 | /// number of clusters or with the highest chi2 value in case of equality. | |
547 | /// If all=kTRUE: both tracks are removed. | |
548 | ||
549 | // tag the tracks to be removed | |
550 | TagConnectedTracks(stMin, stMax, all); | |
551 | ||
552 | // remove them | |
553 | Int_t nTracks = fRecTracksPtr->GetEntriesFast(); | |
554 | for (Int_t i = 0; i < nTracks; i++) { | |
555 | if (((AliMUONTrack*) fRecTracksPtr->UncheckedAt(i))->IsConnected()) { | |
556 | fRecTracksPtr->RemoveAt(i); | |
557 | fNRecTracks--; | |
558 | } | |
559 | } | |
560 | ||
561 | // remove holes in the array if any | |
562 | fRecTracksPtr->Compress(); | |
563 | } | |
564 | ||
565 | //__________________________________________________________________________ | |
566 | void AliMUONVTrackReconstructor::TagConnectedTracks(Int_t stMin, Int_t stMax, Bool_t all) | |
567 | { | |
568 | /// Find and tag tracks sharing 1 cluster or more in station(s) [stMin, stMax]. | |
569 | /// For each couple of connected tracks, one tags the one with the smallest | |
570 | /// number of clusters or with the highest chi2 value in case of equality. | |
571 | /// If all=kTRUE: both tracks are tagged. | |
572 | ||
573 | AliMUONTrack *track1, *track2; | |
574 | Int_t nClusters1, nClusters2; | |
575 | Int_t nTracks = fRecTracksPtr->GetEntriesFast(); | |
576 | ||
577 | // reset the tags | |
578 | for (Int_t i = 0; i < nTracks; i++) ((AliMUONTrack*) fRecTracksPtr->UncheckedAt(i))->Connected(kFALSE); | |
579 | ||
c59f70b9 | 580 | // Loop over first track of the pair |
5c15a68b | 581 | for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) { |
582 | track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1); | |
583 | ||
c59f70b9 | 584 | // Loop over second track of the pair |
5c15a68b | 585 | for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) { |
586 | track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2); | |
587 | ||
588 | // check for connected tracks and tag them | |
589 | if (track1->ClustersInCommon(track2, stMin, stMax) > 0) { | |
590 | ||
591 | if (all) { | |
592 | ||
593 | // tag both tracks | |
594 | track1->Connected(); | |
595 | track2->Connected(); | |
596 | ||
597 | } else { | |
598 | ||
599 | // tag only the worst track | |
600 | nClusters1 = track1->GetNClusters(); | |
601 | nClusters2 = track2->GetNClusters(); | |
602 | if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) { | |
603 | track2->Connected(); | |
604 | } else { | |
605 | track1->Connected(); | |
606 | } | |
607 | ||
608 | } | |
609 | ||
610 | } | |
611 | ||
612 | } | |
613 | ||
614 | } | |
615 | ||
ea94c18b | 616 | } |
617 | ||
1fef78c8 | 618 | //__________________________________________________________________________ |
9bf6860b | 619 | void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam, |
620 | AliMUONVClusterStore& clusterStore, Int_t chamber) | |
1fef78c8 | 621 | { |
622 | /// Ask the clustering to reconstruct new clusters around the track candidate position | |
1fef78c8 | 623 | |
9bf6860b | 624 | // check if the current chamber is useable |
a0dc65b4 | 625 | if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return; |
1fef78c8 | 626 | |
9bf6860b | 627 | // maximum distance between the center of the chamber and a detection element |
628 | // (accounting for the inclination of the chamber) | |
b89ac3d6 | 629 | static const Double_t kMaxDZ = 15.; // 15 cm |
1fef78c8 | 630 | |
9bf6860b | 631 | // extrapolate track parameters to the chamber |
632 | AliMUONTrackParam extrapTrackParam(trackParam); | |
4ea3f013 | 633 | if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber))) return; |
9bf6860b | 634 | |
6b191dea | 635 | // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value |
9bf6860b | 636 | const TMatrixD& kParamCov = extrapTrackParam.GetCovariances(); |
6b191dea | 637 | Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) + |
638 | GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber); | |
639 | Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) + | |
640 | GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber); | |
b89ac3d6 | 641 | Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ + |
a0dc65b4 | 642 | GetRecoParam()->GetMaxNonBendingDistanceToTrack() + |
6b191dea | 643 | GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2); |
b89ac3d6 | 644 | Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ + |
a0dc65b4 | 645 | GetRecoParam()->GetMaxBendingDistanceToTrack() + |
6b191dea | 646 | GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2); |
6e97fbb8 | 647 | AliMpArea area(extrapTrackParam.GetNonBendingCoor(), |
648 | extrapTrackParam.GetBendingCoor(), | |
649 | dX, dY); | |
1fef78c8 | 650 | |
651 | // ask to cluterize in the given area of the given chamber | |
35be7ed7 | 652 | fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam()); |
1fef78c8 | 653 | |
9bf6860b | 654 | } |
655 | ||
656 | //__________________________________________________________________________ | |
657 | void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam, | |
658 | AliMUONVClusterStore& clusterStore, Int_t station) | |
659 | { | |
660 | /// Ask the clustering to reconstruct new clusters around the track candidate position | |
661 | /// in the 2 chambers of the given station | |
662 | AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1); | |
663 | AskForNewClustersInChamber(trackParam, clusterStore, 2*station); | |
1fef78c8 | 664 | } |
665 | ||
ea94c18b | 666 | //__________________________________________________________________________ |
96ebe67e | 667 | Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster, |
1fef78c8 | 668 | AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator) |
ea94c18b | 669 | { |
96ebe67e | 670 | /// Test the compatibility between the track and the cluster (using trackParam's covariance matrix): |
ea94c18b | 671 | /// return the corresponding Chi2 |
96ebe67e | 672 | /// return trackParamAtCluster |
ea94c18b | 673 | |
96ebe67e | 674 | // extrapolate track parameters and covariances at the z position of the tested cluster |
4ea3f013 | 675 | // and set pointer to cluster into trackParamAtCluster |
96ebe67e | 676 | trackParamAtCluster = trackParam; |
96ebe67e | 677 | trackParamAtCluster.SetClusterPtr(cluster); |
4ea3f013 | 678 | if (!AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator)) |
679 | return 2.*AliMUONTrack::MaxChi2(); | |
ea94c18b | 680 | |
96ebe67e | 681 | // Set differences between trackParam and cluster in the bending and non bending directions |
682 | Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor(); | |
683 | Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor(); | |
ea94c18b | 684 | |
019df241 | 685 | // Calculate errors and covariances |
96ebe67e | 686 | const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances(); |
687 | Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2(); | |
688 | Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2(); | |
6b191dea | 689 | Double_t covXY = kParamCov(0,2); |
690 | Double_t det = sigmaX2 * sigmaY2 - covXY * covXY; | |
019df241 | 691 | |
692 | // Compute chi2 | |
4ea3f013 | 693 | if (det == 0.) return 2.*AliMUONTrack::MaxChi2(); |
6b191dea | 694 | return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det; |
019df241 | 695 | |
696 | } | |
697 | ||
698 | //__________________________________________________________________________ | |
5a240757 | 699 | Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster) |
019df241 | 700 | { |
9bf6860b | 701 | /// Test the compatibility between the track and the cluster |
6b191dea | 702 | /// given the track and cluster resolutions + the maximum-distance-to-track value |
9bf6860b | 703 | /// and assuming linear propagation of the track: |
019df241 | 704 | /// return kTRUE if they are compatibles |
705 | ||
96ebe67e | 706 | Double_t dZ = cluster->GetZ() - trackParam.GetZ(); |
707 | Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ); | |
708 | Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ); | |
9bf6860b | 709 | const TMatrixD& kParamCov = trackParam.GetCovariances(); |
6b191dea | 710 | Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2(); |
711 | Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2(); | |
9bf6860b | 712 | |
6b191dea | 713 | Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) + |
a0dc65b4 | 714 | GetRecoParam()->GetMaxNonBendingDistanceToTrack(); |
6b191dea | 715 | Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) + |
a0dc65b4 | 716 | GetRecoParam()->GetMaxBendingDistanceToTrack(); |
019df241 | 717 | |
9bf6860b | 718 | if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE; |
019df241 | 719 | |
720 | return kTRUE; | |
721 | ||
722 | } | |
723 | ||
724 | //__________________________________________________________________________ | |
96ebe67e | 725 | Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2, |
726 | AliMUONTrackParam &trackParamAtCluster2) | |
019df241 | 727 | { |
96ebe67e | 728 | /// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix) |
729 | /// assuming linear propagation between the two clusters: | |
730 | /// return the corresponding Chi2 accounting for covariances between the 2 clusters | |
731 | /// return trackParamAtCluster2 | |
019df241 | 732 | |
96ebe67e | 733 | // extrapolate linearly track parameters and covariances at the z position of the second cluster |
734 | trackParamAtCluster2 = trackParamAtCluster1; | |
3fe6651e | 735 | AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ()); |
019df241 | 736 | |
96ebe67e | 737 | // set pointer to cluster2 into trackParamAtCluster2 |
738 | trackParamAtCluster2.SetClusterPtr(cluster2); | |
019df241 | 739 | |
96ebe67e | 740 | // Set differences between track and clusters in the bending and non bending directions |
741 | AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr(); | |
742 | Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor(); | |
743 | Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor(); | |
744 | Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor(); | |
745 | Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor(); | |
019df241 | 746 | |
747 | // Calculate errors and covariances | |
96ebe67e | 748 | const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances(); |
749 | const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances(); | |
750 | Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ(); | |
751 | Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2(); | |
752 | Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2(); | |
019df241 | 753 | Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1); |
96ebe67e | 754 | Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2(); |
755 | Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2(); | |
019df241 | 756 | Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3); |
757 | ||
758 | // Compute chi2 | |
759 | Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2; | |
760 | Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2; | |
4ea3f013 | 761 | if (detX == 0. || detY == 0.) return 2.*AliMUONTrack::MaxChi2(); |
019df241 | 762 | return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX |
763 | + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY; | |
764 | ||
765 | } | |
766 | ||
767 | //__________________________________________________________________________ | |
9bf6860b | 768 | Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore, |
769 | Int_t nextChamber) | |
770 | { | |
771 | /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s) | |
772 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: | |
773 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
774 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
775 | /// Remove the obsolete "trackCandidate" at the end. | |
776 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. | |
777 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
778 | AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1)); | |
779 | ||
4ea3f013 | 780 | Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2(); |
a0dc65b4 | 781 | Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
782 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
9bf6860b | 783 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; |
784 | Bool_t foundOneCluster = kFALSE; | |
785 | AliMUONTrack *newTrack = 0x0; | |
786 | AliMUONVCluster *cluster; | |
787 | AliMUONTrackParam trackParam; | |
788 | AliMUONTrackParam extrapTrackParamAtCluster; | |
789 | AliMUONTrackParam bestTrackParamAtCluster; | |
790 | ||
791 | // Get track parameters according to the propagation direction | |
792 | if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
793 | else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
794 | ||
795 | // Printout for debuging | |
796 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
797 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
798 | trackParam.GetParameters().Print(); | |
799 | trackParam.GetCovariances().Print(); | |
800 | } | |
801 | ||
802 | // Add MCS effect | |
4663da9f | 803 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.); |
9bf6860b | 804 | |
805 | // Printout for debuging | |
806 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
807 | cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl; | |
808 | } | |
809 | ||
810 | // Create iterators to loop over clusters in chamber | |
811 | TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber)); | |
812 | ||
813 | // look for candidates in chamber | |
814 | while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) { | |
815 | ||
816 | // try to add the current cluster fast | |
817 | if (!TryOneClusterFast(trackParam, cluster)) continue; | |
818 | ||
819 | // try to add the current cluster accuratly | |
820 | extrapTrackParamAtCluster = trackParam; | |
3fe6651e | 821 | AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ()); |
9bf6860b | 822 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster); |
823 | ||
824 | // if good chi2 then consider to add cluster | |
825 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
826 | foundOneCluster = kTRUE; | |
827 | ||
828 | // Printout for debuging | |
829 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
830 | cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1 | |
831 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
832 | cluster->Print(); | |
833 | } | |
834 | ||
a0dc65b4 | 835 | if (GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 836 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
837 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); | |
a0dc65b4 | 838 | if (GetRecoParam()->RequestStation(nextChamber/2)) |
9bf6860b | 839 | extrapTrackParamAtCluster.SetRemovable(kFALSE); |
840 | else extrapTrackParamAtCluster.SetRemovable(kTRUE); | |
841 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster); | |
89c8d66d | 842 | newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster); |
9bf6860b | 843 | fNRecTracks++; |
844 | ||
845 | // Printout for debuging | |
846 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
847 | cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl; | |
848 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
849 | } | |
850 | ||
851 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { | |
852 | // keep track of the best cluster | |
853 | bestChi2WithOneCluster = chi2WithOneCluster; | |
854 | bestTrackParamAtCluster = extrapTrackParamAtCluster; | |
855 | } | |
856 | ||
857 | } | |
858 | ||
859 | } | |
860 | ||
861 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 862 | if (!GetRecoParam()->TrackAllTracks()) { |
9bf6860b | 863 | if (foundOneCluster) { |
a0dc65b4 | 864 | if (GetRecoParam()->RequestStation(nextChamber/2)) |
9bf6860b | 865 | bestTrackParamAtCluster.SetRemovable(kFALSE); |
866 | else bestTrackParamAtCluster.SetRemovable(kTRUE); | |
867 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr())); | |
89c8d66d | 868 | trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster); |
9bf6860b | 869 | |
870 | // Printout for debuging | |
871 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
872 | cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl; | |
873 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); | |
874 | } | |
875 | ||
876 | } else return kFALSE; | |
877 | ||
878 | } else if (foundOneCluster) { | |
879 | ||
880 | // remove obsolete track | |
881 | fRecTracksPtr->Remove(&trackCandidate); | |
882 | fNRecTracks--; | |
883 | ||
884 | } else return kFALSE; | |
885 | ||
886 | return kTRUE; | |
887 | ||
888 | } | |
889 | ||
890 | //__________________________________________________________________________ | |
96ebe67e | 891 | Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore, |
892 | Int_t nextStation) | |
019df241 | 893 | { |
96ebe67e | 894 | /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s) |
019df241 | 895 | /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks: |
896 | /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of | |
897 | /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure. | |
898 | /// Remove the obsolete "trackCandidate" at the end. | |
96ebe67e | 899 | /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority. |
900 | /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE) | |
019df241 | 901 | AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1)); |
902 | ||
903 | // Order the chamber according to the propagation direction (tracking starts with chamber 2): | |
904 | // - nextStation == station(1...) 5 => forward propagation | |
905 | // - nextStation < station(1...) 5 => backward propagation | |
906 | Int_t ch1, ch2; | |
907 | if (nextStation==4) { | |
908 | ch1 = 2*nextStation+1; | |
909 | ch2 = 2*nextStation; | |
ea94c18b | 910 | } else { |
019df241 | 911 | ch1 = 2*nextStation; |
912 | ch2 = 2*nextStation+1; | |
ea94c18b | 913 | } |
914 | ||
4ea3f013 | 915 | Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2(); |
916 | Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2(); | |
a0dc65b4 | 917 | Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() * |
918 | GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2 | |
919 | Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() * | |
920 | GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2 | |
96ebe67e | 921 | Double_t bestChi2WithOneCluster = maxChi2WithOneCluster; |
922 | Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters; | |
923 | Bool_t foundOneCluster = kFALSE; | |
924 | Bool_t foundTwoClusters = kFALSE; | |
019df241 | 925 | AliMUONTrack *newTrack = 0x0; |
96ebe67e | 926 | AliMUONVCluster *clusterCh1, *clusterCh2; |
7332f213 | 927 | AliMUONTrackParam trackParam; |
96ebe67e | 928 | AliMUONTrackParam extrapTrackParamAtCluster1; |
929 | AliMUONTrackParam extrapTrackParamAtCluster2; | |
930 | AliMUONTrackParam bestTrackParamAtCluster1; | |
931 | AliMUONTrackParam bestTrackParamAtCluster2; | |
932 | ||
933 | Int_t nClusters = clusterStore.GetSize(); | |
934 | Bool_t *clusterCh1Used = new Bool_t[nClusters]; | |
935 | for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE; | |
936 | Int_t iCluster1; | |
019df241 | 937 | |
7332f213 | 938 | // Get track parameters according to the propagation direction |
939 | if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last(); | |
940 | else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First(); | |
019df241 | 941 | |
9bf6860b | 942 | // Printout for debuging |
943 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) { | |
944 | cout<<endl<<"Track parameters and covariances at first cluster:"<<endl; | |
945 | trackParam.GetParameters().Print(); | |
946 | trackParam.GetCovariances().Print(); | |
947 | } | |
948 | ||
019df241 | 949 | // Add MCS effect |
4663da9f | 950 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.); |
019df241 | 951 | |
952 | // Printout for debuging | |
953 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 954 | cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl; |
019df241 | 955 | } |
956 | ||
96ebe67e | 957 | // Create iterators to loop over clusters in both chambers |
958 | TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1)); | |
959 | TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2)); | |
960 | ||
961 | // look for candidates in chamber 2 | |
962 | while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) { | |
019df241 | 963 | |
96ebe67e | 964 | // try to add the current cluster fast |
965 | if (!TryOneClusterFast(trackParam, clusterCh2)) continue; | |
019df241 | 966 | |
96ebe67e | 967 | // try to add the current cluster accuratly |
968 | extrapTrackParamAtCluster2 = trackParam; | |
3fe6651e | 969 | AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ()); |
96ebe67e | 970 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2); |
019df241 | 971 | |
96ebe67e | 972 | // if good chi2 then try to attach a cluster in the other chamber too |
973 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
974 | Bool_t foundSecondCluster = kFALSE; | |
019df241 | 975 | |
976 | // Printout for debuging | |
977 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 978 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1 |
979 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 980 | clusterCh2->Print(); |
96ebe67e | 981 | cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl; |
019df241 | 982 | } |
983 | ||
984 | // add MCS effect | |
4663da9f | 985 | AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
019df241 | 986 | |
96ebe67e | 987 | // reset cluster iterator of chamber 1 |
988 | nextInCh1.Reset(); | |
989 | iCluster1 = -1; | |
990 | ||
991 | // look for second candidates in chamber 1 | |
992 | while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
993 | iCluster1++; | |
019df241 | 994 | |
96ebe67e | 995 | // try to add the current cluster fast |
996 | if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue; | |
019df241 | 997 | |
96ebe67e | 998 | // try to add the current cluster in addition to the one found in the previous chamber |
999 | chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1); | |
019df241 | 1000 | |
96ebe67e | 1001 | // if good chi2 then consider to add the 2 clusters to the "trackCandidate" |
1002 | if (chi2WithTwoClusters < maxChi2WithTwoClusters) { | |
1003 | foundSecondCluster = kTRUE; | |
1004 | foundTwoClusters = kTRUE; | |
019df241 | 1005 | |
1006 | // Printout for debuging | |
1007 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1008 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
9bf6860b | 1009 | << " (Chi2 = " << chi2WithTwoClusters << ")" << endl; |
1010 | clusterCh1->Print(); | |
019df241 | 1011 | } |
1012 | ||
a0dc65b4 | 1013 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 1014 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters |
019df241 | 1015 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
96ebe67e | 1016 | extrapTrackParamAtCluster1.SetRemovable(kTRUE); |
1017 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1); | |
1018 | extrapTrackParamAtCluster2.SetRemovable(kTRUE); | |
1019 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2); | |
89c8d66d | 1020 | newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters); |
019df241 | 1021 | fNRecTracks++; |
1022 | ||
96ebe67e | 1023 | // Tag clusterCh1 as used |
1024 | clusterCh1Used[iCluster1] = kTRUE; | |
019df241 | 1025 | |
1026 | // Printout for debuging | |
1027 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1028 | cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl; |
019df241 | 1029 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1030 | } | |
1031 | ||
96ebe67e | 1032 | } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) { |
1033 | // keep track of the best couple of clusters | |
1034 | bestChi2WithTwoClusters = chi2WithTwoClusters; | |
1035 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
1036 | bestTrackParamAtCluster2 = extrapTrackParamAtCluster2; | |
019df241 | 1037 | } |
1038 | ||
1039 | } | |
1040 | ||
1041 | } | |
1042 | ||
96ebe67e | 1043 | // if no cluster found in chamber1 then consider to add clusterCh2 only |
1044 | if (!foundSecondCluster) { | |
1045 | foundOneCluster = kTRUE; | |
019df241 | 1046 | |
a0dc65b4 | 1047 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 1048 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
019df241 | 1049 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
a0dc65b4 | 1050 | if (GetRecoParam()->RequestStation(nextStation)) |
9bf6860b | 1051 | extrapTrackParamAtCluster2.SetRemovable(kFALSE); |
1052 | else extrapTrackParamAtCluster2.SetRemovable(kTRUE); | |
96ebe67e | 1053 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2); |
89c8d66d | 1054 | newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster); |
019df241 | 1055 | fNRecTracks++; |
1056 | ||
1057 | // Printout for debuging | |
1058 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1059 | cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl; |
019df241 | 1060 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1061 | } | |
1062 | ||
96ebe67e | 1063 | } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) { |
1064 | // keep track of the best cluster except if a couple of clusters has already been found | |
1065 | bestChi2WithOneCluster = chi2WithOneCluster; | |
1066 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster2; | |
019df241 | 1067 | } |
1068 | ||
1069 | } | |
1070 | ||
1071 | } | |
1072 | ||
1073 | } | |
1074 | ||
1075 | // look for candidates in chamber 1 not already attached to a track | |
96ebe67e | 1076 | // if we want to keep all possible tracks or if no good couple of clusters has been found |
a0dc65b4 | 1077 | if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) { |
019df241 | 1078 | |
1079 | // Printout for debuging | |
1080 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1081 | cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl; |
019df241 | 1082 | } |
1083 | ||
1084 | //Extrapolate trackCandidate to chamber "ch2" | |
3fe6651e | 1085 | AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2)); |
019df241 | 1086 | |
1087 | // add MCS effect for next step | |
4663da9f | 1088 | AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.); |
9bf6860b | 1089 | |
96ebe67e | 1090 | // reset cluster iterator of chamber 1 |
1091 | nextInCh1.Reset(); | |
1092 | iCluster1 = -1; | |
1093 | ||
1094 | // look for second candidates in chamber 1 | |
1095 | while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) { | |
1096 | iCluster1++; | |
019df241 | 1097 | |
96ebe67e | 1098 | if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used |
019df241 | 1099 | |
96ebe67e | 1100 | // try to add the current cluster fast |
1101 | if (!TryOneClusterFast(trackParam, clusterCh1)) continue; | |
9bf6860b | 1102 | |
96ebe67e | 1103 | // try to add the current cluster accuratly |
1104 | extrapTrackParamAtCluster1 = trackParam; | |
3fe6651e | 1105 | AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ()); |
96ebe67e | 1106 | chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1); |
9bf6860b | 1107 | |
96ebe67e | 1108 | // if good chi2 then consider to add clusterCh1 |
1109 | // We do not try to attach a cluster in the other chamber too since it has already been done above | |
1110 | if (chi2WithOneCluster < maxChi2WithOneCluster) { | |
1111 | foundOneCluster = kTRUE; | |
019df241 | 1112 | |
1113 | // Printout for debuging | |
1114 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1115 | cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1 |
1116 | << " (Chi2 = " << chi2WithOneCluster << ")" << endl; | |
9bf6860b | 1117 | clusterCh1->Print(); |
019df241 | 1118 | } |
1119 | ||
a0dc65b4 | 1120 | if (GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 1121 | // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster |
019df241 | 1122 | newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate); |
a0dc65b4 | 1123 | if (GetRecoParam()->RequestStation(nextStation)) |
9bf6860b | 1124 | extrapTrackParamAtCluster1.SetRemovable(kFALSE); |
1125 | else extrapTrackParamAtCluster1.SetRemovable(kTRUE); | |
96ebe67e | 1126 | newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1); |
89c8d66d | 1127 | newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster); |
019df241 | 1128 | fNRecTracks++; |
1129 | ||
1130 | // Printout for debuging | |
1131 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1132 | cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl; |
019df241 | 1133 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1134 | } | |
1135 | ||
96ebe67e | 1136 | } else if (chi2WithOneCluster < bestChi2WithOneCluster) { |
1137 | // keep track of the best cluster except if a couple of clusters has already been found | |
1138 | bestChi2WithOneCluster = chi2WithOneCluster; | |
1139 | bestTrackParamAtCluster1 = extrapTrackParamAtCluster1; | |
019df241 | 1140 | } |
1141 | ||
1142 | } | |
1143 | ||
1144 | } | |
1145 | ||
1146 | } | |
1147 | ||
1148 | // fill out the best track if required else clean up the fRecTracksPtr array | |
a0dc65b4 | 1149 | if (!GetRecoParam()->TrackAllTracks()) { |
96ebe67e | 1150 | if (foundTwoClusters) { |
1151 | bestTrackParamAtCluster1.SetRemovable(kTRUE); | |
1152 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr())); | |
1153 | bestTrackParamAtCluster2.SetRemovable(kTRUE); | |
1154 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr())); | |
89c8d66d | 1155 | trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters); |
019df241 | 1156 | |
1157 | // Printout for debuging | |
1158 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1159 | cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl; |
019df241 | 1160 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1161 | } | |
1162 | ||
96ebe67e | 1163 | } else if (foundOneCluster) { |
a0dc65b4 | 1164 | if (GetRecoParam()->RequestStation(nextStation)) |
9bf6860b | 1165 | bestTrackParamAtCluster1.SetRemovable(kFALSE); |
1166 | else bestTrackParamAtCluster1.SetRemovable(kTRUE); | |
96ebe67e | 1167 | trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr())); |
89c8d66d | 1168 | trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster); |
019df241 | 1169 | |
1170 | // Printout for debuging | |
1171 | if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) { | |
96ebe67e | 1172 | cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl; |
019df241 | 1173 | if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump(); |
1174 | } | |
1175 | ||
dd230855 | 1176 | } else { |
96ebe67e | 1177 | delete [] clusterCh1Used; |
dd230855 | 1178 | return kFALSE; |
1179 | } | |
019df241 | 1180 | |
96ebe67e | 1181 | } else if (foundOneCluster || foundTwoClusters) { |
019df241 | 1182 | |
1183 | // remove obsolete track | |
1184 | fRecTracksPtr->Remove(&trackCandidate); | |
1185 | fNRecTracks--; | |
1186 | ||
dd230855 | 1187 | } else { |
96ebe67e | 1188 | delete [] clusterCh1Used; |
dd230855 | 1189 | return kFALSE; |
1190 | } | |
ea94c18b | 1191 | |
96ebe67e | 1192 | delete [] clusterCh1Used; |
019df241 | 1193 | return kTRUE; |
ea94c18b | 1194 | |
1195 | } | |
1196 | ||
7332f213 | 1197 | //__________________________________________________________________________ |
1198 | void AliMUONVTrackReconstructor::ImproveTracks() | |
1199 | { | |
1200 | /// Improve tracks by removing clusters with local chi2 highter than the defined cut | |
1201 | /// Recompute track parameters and covariances at the remaining clusters | |
1202 | AliDebug(1,"Enter ImproveTracks"); | |
1203 | ||
1204 | AliMUONTrack *track, *nextTrack; | |
1205 | ||
7332f213 | 1206 | track = (AliMUONTrack*) fRecTracksPtr->First(); |
1207 | while (track) { | |
1208 | ||
1209 | // prepare next track in case the actual track is suppressed | |
1210 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); | |
1211 | ||
1212 | ImproveTrack(*track); | |
1213 | ||
1214 | // remove track if improvement failed | |
1215 | if (!track->IsImproved()) { | |
1216 | fRecTracksPtr->Remove(track); | |
1217 | fNRecTracks--; | |
1218 | } | |
1219 | ||
1220 | track = nextTrack; | |
1221 | } | |
1222 | ||
1223 | // compress the array in case of some tracks have been removed | |
1224 | fRecTracksPtr->Compress(); | |
1225 | ||
1226 | } | |
1227 | ||
1228 | //__________________________________________________________________________ | |
1229 | void AliMUONVTrackReconstructor::Finalize() | |
1230 | { | |
5c15a68b | 1231 | /// Recompute track parameters and covariances at each attached cluster |
2e2d0c44 | 1232 | /// Set the label pointing to the corresponding MC track |
4ea3f013 | 1233 | /// Remove the track if finalization failed |
7332f213 | 1234 | |
4ea3f013 | 1235 | AliMUONTrack *track, *nextTrack; |
1236 | Bool_t trackRemoved = kFALSE; | |
7332f213 | 1237 | |
1238 | track = (AliMUONTrack*) fRecTracksPtr->First(); | |
1239 | while (track) { | |
1240 | ||
4ea3f013 | 1241 | nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); |
7332f213 | 1242 | |
4ea3f013 | 1243 | if (FinalizeTrack(*track)) track->FindMCLabel(); |
1244 | else { | |
1245 | fRecTracksPtr->Remove(track); | |
1246 | fNRecTracks--; | |
1247 | trackRemoved = kTRUE; | |
1248 | } | |
2e2d0c44 | 1249 | |
4ea3f013 | 1250 | track = nextTrack; |
7332f213 | 1251 | |
1252 | } | |
1253 | ||
4ea3f013 | 1254 | // compress array of tracks if needed |
1255 | if (trackRemoved) fRecTracksPtr->Compress(); | |
1256 | ||
7332f213 | 1257 | } |
1258 | ||
1259 | //__________________________________________________________________________ | |
7ec3b9cf | 1260 | void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore, |
1261 | const AliMUONVTriggerTrackStore& triggerTrackStore, | |
1262 | const AliMUONVTriggerStore& triggerStore, | |
1263 | const AliMUONTrackHitPattern& trackHitPattern) | |
8d0843c6 | 1264 | { |
1265 | /// Try to match track from tracking system with trigger track | |
99c136e1 | 1266 | AliCodeTimerAuto("",0); |
fda59e58 | 1267 | |
683cb6c5 | 1268 | trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore); |
8d0843c6 | 1269 | } |
1270 | ||
9f164762 | 1271 | |
1272 | //__________________________________________________________________________ | |
ea94c18b | 1273 | void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit, |
1274 | const AliMUONVTriggerStore& triggerStore, | |
1275 | AliMUONVTriggerTrackStore& triggerTrackStore) | |
8d0843c6 | 1276 | { |
9f164762 | 1277 | /// Fill trigger track store from local trigger |
7ec3b9cf | 1278 | AliDebug(1, ""); |
99c136e1 | 1279 | AliCodeTimerAuto("",0); |
bdfb6eef | 1280 | |
7ec3b9cf | 1281 | AliMUONGlobalTrigger* globalTrigger = triggerStore.Global(); |
e6b25a6e | 1282 | |
7ec3b9cf | 1283 | UChar_t gloTrigPat = 0; |
e6b25a6e | 1284 | |
7ec3b9cf | 1285 | if (globalTrigger) |
1286 | { | |
1287 | gloTrigPat = globalTrigger->GetGlobalResponse(); | |
e6b25a6e | 1288 | } |
1289 | ||
9f164762 | 1290 | AliMUONTriggerTrack triggerTrack; |
1291 | ||
7ec3b9cf | 1292 | TIter next(triggerStore.CreateIterator()); |
1293 | AliMUONLocalTrigger* locTrg(0x0); | |
7ec3b9cf | 1294 | |
1295 | while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) ) | |
1296 | { | |
bdfb6eef | 1297 | if ( locTrg->IsTrigX() && locTrg->IsTrigY() ) |
7ec3b9cf | 1298 | { // make Trigger Track if trigger in X and Y |
7ec3b9cf | 1299 | |
9f164762 | 1300 | TriggerToTrack(circuit, *locTrg, triggerTrack, gloTrigPat); |
bdfb6eef | 1301 | |
7ec3b9cf | 1302 | triggerTrackStore.Add(triggerTrack); |
1303 | } // board is fired | |
e6b25a6e | 1304 | } // end of loop on Local Trigger |
8d0843c6 | 1305 | } |
9f164762 | 1306 | |
1307 | //__________________________________________________________________________ | |
1308 | void AliMUONVTrackReconstructor::TriggerToTrack(const AliMUONTriggerCircuit& circuit, | |
1309 | const AliMUONLocalTrigger& locTrg, | |
1310 | AliMUONTriggerTrack& triggerTrack, | |
1311 | UChar_t globalTriggerPattern) | |
1312 | { | |
1313 | /// To make the trigger tracks from Local Trigger | |
1314 | const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso(); | |
1315 | const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso(); | |
1316 | const Double_t kSqrt12 = TMath::Sqrt(12.); | |
1317 | ||
1318 | TMatrixD trigCov(3,3); | |
1319 | ||
1320 | Int_t localBoardId = locTrg.LoCircuit(); | |
1321 | ||
1322 | Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg.LoStripX()); | |
1323 | Float_t z11 = circuit.GetZ11Pos(localBoardId, locTrg.LoStripX()); | |
1324 | // need first to convert deviation to [0-30] | |
1325 | // (see AliMUONLocalTriggerBoard::LocalTrigger) | |
1326 | Int_t deviation = locTrg.GetDeviation(); | |
1327 | Int_t stripX21 = locTrg.LoStripX()+deviation+1; | |
1328 | Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21); | |
1329 | Float_t z21 = circuit.GetZ21Pos(localBoardId, stripX21); | |
1330 | Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg.LoStripY()); | |
1331 | ||
1332 | AliDebug(1, Form(" MakeTriggerTrack %3d %2d %2d %2d (%f %f %f) (%f %f)\n",locTrg.LoCircuit(), | |
1333 | locTrg.LoStripX(),locTrg.LoStripX()+deviation+1,locTrg.LoStripY(),x11, y11, z11, y21, z21)); | |
1334 | ||
1335 | Double_t deltaZ = z11 - z21; | |
1336 | ||
1337 | Float_t slopeX = x11/z11; | |
1338 | Float_t slopeY = (y11-y21) / deltaZ; | |
1339 | ||
1340 | Float_t sigmaX = circuit.GetX11Width(localBoardId, locTrg.LoStripY()) / kSqrt12; | |
1341 | Float_t sigmaY = circuit.GetY11Width(localBoardId, locTrg.LoStripX()) / kSqrt12; | |
1342 | Float_t sigmaY21 = circuit.GetY21Width(localBoardId, locTrg.LoStripX()) / kSqrt12; | |
1343 | ||
1344 | trigCov.Zero(); | |
1345 | trigCov(0,0) = kTrigNonBendReso * kTrigNonBendReso + sigmaX * sigmaX; | |
1346 | trigCov(1,1) = kTrigBendReso * kTrigBendReso + sigmaY * sigmaY; | |
1347 | trigCov(2,2) = | |
1348 | (2. * kTrigBendReso * kTrigBendReso + sigmaY * sigmaY + sigmaY21 * sigmaY21 ) / deltaZ / deltaZ; | |
1349 | trigCov(1,2) = trigCov(2,1) = trigCov(1,1) / deltaZ; | |
1350 | ||
1351 | triggerTrack.SetX11(x11); | |
1352 | triggerTrack.SetY11(y11); | |
1353 | triggerTrack.SetZ11(z11); | |
1354 | triggerTrack.SetZ21(z21); | |
1355 | triggerTrack.SetSlopeX(slopeX); | |
1356 | triggerTrack.SetSlopeY(slopeY); | |
1357 | triggerTrack.SetGTPattern(globalTriggerPattern); | |
1358 | triggerTrack.SetLoTrgNum(localBoardId); | |
1359 | triggerTrack.SetCovariances(trigCov); | |
1360 | triggerTrack.SetUniqueID(locTrg.GetUniqueID()); | |
1361 | } |