prevent double event counting
[u/mrichter/AliRoot.git] / MUON / AliMUONVTrackReconstructor.cxx
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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
78649106 97/// \cond CLASSIMP
8d0843c6 98ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
78649106 99/// \endcond
8d0843c6 100
ea94c18b 101 //__________________________________________________________________________
a0dc65b4 102AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam,
103 AliMUONVClusterServer* clusterServer)
104: TObject(),
105fRecTracksPtr(0x0),
106fNRecTracks(0),
107fClusterServer(clusterServer),
6b191dea 108fkRecoParam(recoParam),
4663da9f 109fMaxMCSAngle2(0x0)
8d0843c6 110{
111 /// Constructor for class AliMUONVTrackReconstructor
b1fea02e 112 /// WARNING: if clusterServer=0x0, no clusterization will be possible at this level
ea94c18b 113
114 // Memory allocation for the TClonesArray of reconstructed tracks
96ebe67e 115 fRecTracksPtr = new TClonesArray("AliMUONTrack", 100);
7ec3b9cf 116
208f139e 117 // set the magnetic field for track extrapolations
f7a1cc68 118 AliMUONTrackExtrap::SetField();
6b191dea 119
120 // set the maximum MCS angle in chamber from the minimum acceptable momentum
121 AliMUONTrackParam param;
122 Double_t inverseBendingP = (GetRecoParam()->GetMinBendingMomentum() > 0.) ? 1./GetRecoParam()->GetMinBendingMomentum() : 1.;
123 param.SetInverseBendingMomentum(inverseBendingP);
4663da9f 124 fMaxMCSAngle2 = new Double_t [AliMUONConstants::NTrackingCh()];
125 for (Int_t iCh=0; iCh<AliMUONConstants::NTrackingCh(); iCh++)
126 fMaxMCSAngle2[iCh] = AliMUONTrackExtrap::GetMCSAngle2(param, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
6b191dea 127
8d0843c6 128}
129
130 //__________________________________________________________________________
ea94c18b 131AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
8d0843c6 132{
133 /// Destructor for class AliMUONVTrackReconstructor
ea94c18b 134 delete fRecTracksPtr;
4663da9f 135 delete[] fMaxMCSAngle2;
8d0843c6 136}
137
ea94c18b 138 //__________________________________________________________________________
ea94c18b 139void AliMUONVTrackReconstructor::ResetTracks()
140{
141 /// To reset the TClonesArray of reconstructed tracks
142 if (fRecTracksPtr) fRecTracksPtr->Clear("C");
143 fNRecTracks = 0;
144 return;
145}
146
147 //__________________________________________________________________________
1fef78c8 148void AliMUONVTrackReconstructor::EventReconstruct(AliMUONVClusterStore& clusterStore, AliMUONVTrackStore& trackStore)
ea94c18b 149{
150 /// To reconstruct one event
151 AliDebug(1,"");
99c136e1 152 AliCodeTimerAuto("",0);
ea94c18b 153
96ebe67e 154 // Reset array of tracks
ea94c18b 155 ResetTracks();
2060b217 156
89c8d66d 157 // Look for candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
158 if (!MakeTrackCandidates(clusterStore)) return;
96ebe67e 159
89c8d66d 160 // Look for extra candidates from clusters in stations(1..) 4 and 5 (abort in case of failure)
161 if (GetRecoParam()->MakeMoreTrackCandidates()) {
162 if (!MakeMoreTrackCandidates(clusterStore)) return;
163 }
9bf6860b 164
96ebe67e 165 // Stop tracking if no candidate found
ea94c18b 166 if (fRecTracksPtr->GetEntriesFast() == 0) return;
96ebe67e 167
89c8d66d 168 // Follow tracks in stations(1..) 3, 2 and 1 (abort in case of failure)
169 if (!FollowTracks(clusterStore)) return;
96ebe67e 170
b709ac13 171 // Complement the reconstructed tracks
89c8d66d 172 if (GetRecoParam()->ComplementTracks()) {
173 if (ComplementTracks(clusterStore)) RemoveIdenticalTracks();
174 }
96ebe67e 175
ea94c18b 176 // Improve the reconstructed tracks
a0dc65b4 177 if (GetRecoParam()->ImproveTracks()) ImproveTracks();
96ebe67e 178
c59f70b9 179 // Remove connected tracks
180 if (GetRecoParam()->RemoveConnectedTracksInSt12()) RemoveConnectedTracks(kFALSE);
181 else RemoveConnectedTracks(kTRUE);
96ebe67e 182
ea94c18b 183 // Fill AliMUONTrack data members
184 Finalize();
96ebe67e 185
186 // Add tracks to MUON data container
187 for (Int_t i=0; i<fNRecTracks; ++i)
188 {
189 AliMUONTrack * track = (AliMUONTrack*) fRecTracksPtr->At(i);
4ea3f013 190 if (track->GetGlobalChi2() < AliMUONTrack::MaxChi2()) {
191 track->SetUniqueID(i+1);
192 trackStore.Add(*track);
193 } else AliWarning("problem occur somewhere during track refitting --> discard track");
96ebe67e 194 }
ea94c18b 195}
196
6b191dea 197//__________________________________________________________________________
198Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
199{
200 /// Return kTRUE if the track is within given limits on momentum/angle/origin
201
202 const TMatrixD& kParamCov = trackParam.GetCovariances();
203 Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
204 Double_t z = trackParam.GetZ();
205 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
206
207 // MCS dipersion
208 Double_t angleMCS2 = 0.;
6b191dea 209 Double_t impactMCS2 = 0.;
4663da9f 210 if (AliMUONTrackExtrap::IsFieldON() && chamber < 6) {
211
212 // track momentum is known
213 for (Int_t iCh=0; iCh<=chamber; iCh++) {
214 Double_t localMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(iCh), 1.);
215 angleMCS2 += localMCS2;
216 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * localMCS2;
217 }
218
219 } else {
220
221 // track momentum is unknown
222 for (Int_t iCh=0; iCh<=chamber; iCh++) {
223 angleMCS2 += fMaxMCSAngle2[iCh];
224 impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * fMaxMCSAngle2[iCh];
225 }
226
227 }
6b191dea 228
229 // ------ track selection in non bending direction ------
230 if (GetRecoParam()->SelectOnTrackSlope()) {
231
232 // check if non bending slope is within tolerances
4663da9f 233 Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + angleMCS2);
6b191dea 234 if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
235
236 } else {
237
238 // or check if non bending impact parameter is within tolerances
239 Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
240 Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
241 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
242
243 }
244
245 // ------ track selection in bending direction ------
246 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
247
248 // check if bending momentum is within tolerances
249 Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
250 Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
251 if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
252 else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
253
254 } else {
255
256 if (GetRecoParam()->SelectOnTrackSlope()) {
257
258 // check if bending slope is within tolerances
4663da9f 259 Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + angleMCS2);
6b191dea 260 if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
261
262 } else {
263
264 // or check if bending impact parameter is within tolerances
265 Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
266 Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
267 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
268
269 }
270
271 }
272
273 return kTRUE;
274
275}
276
277//__________________________________________________________________________
9bf6860b 278TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
8d0843c6 279{
9bf6860b 280 /// To make the list of segments from the list of clusters in the 2 given chambers.
208f139e 281 /// Return a new TClonesArray of segments.
282 /// It is the responsibility of the user to delete it afterward.
9bf6860b 283 AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
99c136e1 284 AliCodeTimerAuto("",0);
208f139e 285
96ebe67e 286 AliMUONVCluster *cluster1, *cluster2;
208f139e 287 AliMUONObjectPair *segment;
6b191dea 288 Double_t z1 = 0., z2 = 0., dZ = 0.;
289 Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
290 Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
291 Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
292 Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
4663da9f 293 Double_t angleMCS2 = 0.; // maximum angular dispersion**2 due to MCS in chamber
294 Double_t impactMCS2 = 0.; // maximum impact parameter dispersion**2 due to MCS in chamber
295 for (Int_t iCh=0; iCh<=ch1; iCh++) {
296 angleMCS2 += fMaxMCSAngle2[iCh];
297 impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2[iCh];
298 }
6b191dea 299 Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
7ec3b9cf 300
96ebe67e 301 // Create iterators to loop over clusters in both chambers
302 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
303 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
304
208f139e 305 // list of segments
96ebe67e 306 TClonesArray *segments = new TClonesArray("AliMUONObjectPair", 100);
7ec3b9cf 307
96ebe67e 308 // Loop over clusters in the first chamber of the station
309 while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
6b191dea 310 z1 = cluster1->GetZ();
96ebe67e 311
312 // reset cluster iterator of chamber 2
313 nextInCh2.Reset();
314
315 // Loop over clusters in the second chamber of the station
316 while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
6b191dea 317 z2 = cluster2->GetZ();
318 dZ = z1 - z2;
96ebe67e 319
6b191dea 320 // ------ track selection in non bending direction ------
321 nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
322 if (GetRecoParam()->SelectOnTrackSlope()) {
9f093251 323
6b191dea 324 // check if non bending slope is within tolerances
4663da9f 325 nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + angleMCS2);
6b191dea 326 if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
9f093251 327
6b191dea 328 } else {
329
330 // or check if non bending impact parameter is within tolerances
331 nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
332 nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
333 if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
334
335 }
336
337 // ------ track selection in bending direction ------
338 bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
339 if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
9f093251 340
341 // check if bending momentum is within tolerances
6b191dea 342 bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
343 bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
344 bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
345 bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
346 bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
347 if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
96ebe67e 348
9f093251 349 } else {
350
6b191dea 351 if (GetRecoParam()->SelectOnTrackSlope()) {
352
353 // check if bending slope is within tolerances
4663da9f 354 bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + angleMCS2);
6b191dea 355 if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
356
357 } else {
358
359 // or check if bending impact parameter is within tolerances
360 bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
361 bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
362 if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
363
364 }
365
9f093251 366 }
6b191dea 367
9f093251 368 // make new segment
369 segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
370
371 // Printout for debug
372 if (AliLog::GetGlobalDebugLevel() > 1) {
373 cout << "segmentIndex(0...): " << segments->GetLast() << endl;
374 segment->Dump();
375 cout << "Cluster in first chamber" << endl;
376 cluster1->Print();
377 cout << "Cluster in second chamber" << endl;
378 cluster2->Print();
8d0843c6 379 }
96ebe67e 380
381 }
382
383 }
384
385 // Printout for debug
9bf6860b 386 AliDebug(1,Form("chambers%d-%d: NSegments = %d ", ch1+1, ch2+1, segments->GetEntriesFast()));
96ebe67e 387
208f139e 388 return segments;
8d0843c6 389}
390
ea94c18b 391 //__________________________________________________________________________
89c8d66d 392void AliMUONVTrackReconstructor::RemoveUsedSegments(TClonesArray& segments)
393{
394 /// To remove pairs of clusters already attached to a track
395 AliDebug(1,"Enter RemoveUsedSegments");
396 Int_t nSegments = segments.GetEntriesFast();
397 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
398 AliMUONObjectPair *segment;
399 AliMUONTrack *track;
400 AliMUONVCluster *cluster, *cluster1, *cluster2;
401 Bool_t foundCluster1, foundCluster2, removeSegment;
402
403 // Loop over segments
404 for (Int_t iSegment=0; iSegment<nSegments; iSegment++) {
405 segment = (AliMUONObjectPair*) segments.UncheckedAt(iSegment);
406
407 cluster1 = (AliMUONVCluster*) segment->First();
408 cluster2 = (AliMUONVCluster*) segment->Second();
409 removeSegment = kFALSE;
410
411 // Loop over tracks
412 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
413 track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack);
414
415 // skip empty slot
416 if (!track) continue;
417
418 foundCluster1 = kFALSE;
419 foundCluster2 = kFALSE;
420
421 // Loop over clusters
422 Int_t nClusters = track->GetNClusters();
423 for (Int_t iCluster = 0; iCluster < nClusters; iCluster++) {
424 cluster = ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->UncheckedAt(iCluster))->GetClusterPtr();
425
426 // check if both clusters are in that track
427 if (cluster == cluster1) foundCluster1 = kTRUE;
428 else if (cluster == cluster2) foundCluster2 = kTRUE;
429
430 if (foundCluster1 && foundCluster2) {
431 removeSegment = kTRUE;
432 break;
433 }
434
435 }
436
437 if (removeSegment) break;
438
439 }
440
441 if (removeSegment) segments.RemoveAt(iSegment);
442
443 }
444
445 segments.Compress();
446
447 // Printout for debug
448 AliDebug(1,Form("NSegments = %d ", segments.GetEntriesFast()));
449}
450
451 //__________________________________________________________________________
ea94c18b 452void AliMUONVTrackReconstructor::RemoveIdenticalTracks()
453{
454 /// To remove identical tracks:
96ebe67e 455 /// Tracks are considered identical if they have all their clusters in common.
456 /// One keeps the track with the larger number of clusters if need be
89c8d66d 457 AliMUONTrack *track1, *track2;
458 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
96ebe67e 459 Int_t clustersInCommon, nClusters1, nClusters2;
ea94c18b 460 // Loop over first track of the pair
89c8d66d 461 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
462 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
463 // skip empty slot
464 if (!track1) continue;
96ebe67e 465 nClusters1 = track1->GetNClusters();
ea94c18b 466 // Loop over second track of the pair
89c8d66d 467 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
468 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
469 // skip empty slot
470 if (!track2) continue;
96ebe67e 471 nClusters2 = track2->GetNClusters();
472 // number of clusters in common between two tracks
473 clustersInCommon = track1->ClustersInCommon(track2);
ea94c18b 474 // check for identical tracks
96ebe67e 475 if ((clustersInCommon == nClusters1) || (clustersInCommon == nClusters2)) {
ea94c18b 476 // decide which track to remove
96ebe67e 477 if (nClusters2 > nClusters1) {
ea94c18b 478 // remove track1 and continue the first loop with the track next to track1
89c8d66d 479 fRecTracksPtr->RemoveAt(iTrack1);
ea94c18b 480 fNRecTracks--;
ea94c18b 481 break;
482 } else {
483 // remove track2 and continue the second loop with the track next to track2
89c8d66d 484 fRecTracksPtr->RemoveAt(iTrack2);
ea94c18b 485 fNRecTracks--;
486 }
89c8d66d 487 }
ea94c18b 488 } // track2
ea94c18b 489 } // track1
89c8d66d 490 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
ea94c18b 491}
492
493 //__________________________________________________________________________
494void AliMUONVTrackReconstructor::RemoveDoubleTracks()
495{
496 /// To remove double tracks:
96ebe67e 497 /// Tracks are considered identical if more than half of the clusters of the track
498 /// which has the smaller number of clusters are in common with the other track.
499 /// Among two identical tracks, one keeps the track with the larger number of clusters
ea94c18b 500 /// or, if these numbers are equal, the track with the minimum chi2.
89c8d66d 501 AliMUONTrack *track1, *track2;
502 Int_t nTracks = fRecTracksPtr->GetEntriesFast();
503 Int_t clustersInCommon2, nClusters1, nClusters2;
ea94c18b 504 // Loop over first track of the pair
89c8d66d 505 for (Int_t iTrack1 = 0; iTrack1 < nTracks; iTrack1++) {
506 track1 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack1);
507 // skip empty slot
508 if (!track1) continue;
96ebe67e 509 nClusters1 = track1->GetNClusters();
ea94c18b 510 // Loop over second track of the pair
89c8d66d 511 for (Int_t iTrack2 = iTrack1+1; iTrack2 < nTracks; iTrack2++) {
512 track2 = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iTrack2);
513 // skip empty slot
514 if (!track2) continue;
96ebe67e 515 nClusters2 = track2->GetNClusters();
516 // number of clusters in common between two tracks
89c8d66d 517 clustersInCommon2 = 2 * track1->ClustersInCommon(track2);
ea94c18b 518 // check for identical tracks
89c8d66d 519 if (clustersInCommon2 > nClusters1 || clustersInCommon2 > nClusters2) {
ea94c18b 520 // decide which track to remove
96ebe67e 521 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
ea94c18b 522 // remove track2 and continue the second loop with the track next to track2
89c8d66d 523 fRecTracksPtr->RemoveAt(iTrack2);
c59f70b9 524 fNRecTracks--;
525 } else {
526 // else remove track1 and continue the first loop with the track next to track1
89c8d66d 527 fRecTracksPtr->RemoveAt(iTrack1);
c59f70b9 528 fNRecTracks--;
c59f70b9 529 break;
530 }
89c8d66d 531 }
c59f70b9 532 } // track2
c59f70b9 533 } // track1
89c8d66d 534 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
c59f70b9 535}
536
537 //__________________________________________________________________________
538void AliMUONVTrackReconstructor::RemoveConnectedTracks(Bool_t inSt345)
539{
540 /// To remove double tracks:
541 /// Tracks are considered identical if they share 1 cluster or more.
542 /// If inSt345=kTRUE only stations 3, 4 and 5 are considered.
543 /// Among two identical tracks, one keeps the track with the larger number of clusters
544 /// or, if these numbers are equal, the track with the minimum chi2.
545 AliMUONTrack *track1, *track2, *trackToRemove;
546 Int_t clustersInCommon, nClusters1, nClusters2;
547 Bool_t removedTrack1;
548 // Loop over first track of the pair
549 track1 = (AliMUONTrack*) fRecTracksPtr->First();
550 while (track1) {
551 removedTrack1 = kFALSE;
552 nClusters1 = track1->GetNClusters();
553 // Loop over second track of the pair
554 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
555 while (track2) {
556 nClusters2 = track2->GetNClusters();
557 // number of clusters in common between two tracks
89c8d66d 558 if (inSt345) clustersInCommon = track1->ClustersInCommonInSt345(track2);
559 else clustersInCommon = track1->ClustersInCommon(track2);
c59f70b9 560 // check for identical tracks
561 if (clustersInCommon > 0) {
562 // decide which track to remove
563 if ((nClusters1 > nClusters2) || ((nClusters1 == nClusters2) && (track1->GetGlobalChi2() <= track2->GetGlobalChi2()))) {
564 // remove track2 and continue the second loop with the track next to track2
565 trackToRemove = track2;
566 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
567 fRecTracksPtr->Remove(trackToRemove);
ea94c18b 568 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
569 fNRecTracks--;
570 } else {
571 // else remove track1 and continue the first loop with the track next to track1
572 trackToRemove = track1;
573 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
574 fRecTracksPtr->Remove(trackToRemove);
575 fRecTracksPtr->Compress(); // this is essential to retrieve the TClonesArray afterwards
576 fNRecTracks--;
577 removedTrack1 = kTRUE;
578 break;
579 }
580 } else track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
581 } // track2
582 if (removedTrack1) continue;
583 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
584 } // track1
585 return;
586}
587
588 //__________________________________________________________________________
9bf6860b 589void AliMUONVTrackReconstructor::AskForNewClustersInChamber(const AliMUONTrackParam &trackParam,
590 AliMUONVClusterStore& clusterStore, Int_t chamber)
1fef78c8 591{
592 /// Ask the clustering to reconstruct new clusters around the track candidate position
1fef78c8 593
9bf6860b 594 // check if the current chamber is useable
a0dc65b4 595 if (!fClusterServer || !GetRecoParam()->UseChamber(chamber)) return;
1fef78c8 596
9bf6860b 597 // maximum distance between the center of the chamber and a detection element
598 // (accounting for the inclination of the chamber)
b89ac3d6 599 static const Double_t kMaxDZ = 15.; // 15 cm
1fef78c8 600
9bf6860b 601 // extrapolate track parameters to the chamber
602 AliMUONTrackParam extrapTrackParam(trackParam);
4ea3f013 603 if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber))) return;
9bf6860b 604
6b191dea 605 // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
9bf6860b 606 const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
6b191dea 607 Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
608 GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
609 Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
610 GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
b89ac3d6 611 Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
a0dc65b4 612 GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
6b191dea 613 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
b89ac3d6 614 Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
a0dc65b4 615 GetRecoParam()->GetMaxBendingDistanceToTrack() +
6b191dea 616 GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
6e97fbb8 617 AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
618 extrapTrackParam.GetBendingCoor(),
619 dX, dY);
1fef78c8 620
621 // ask to cluterize in the given area of the given chamber
35be7ed7 622 fClusterServer->Clusterize(chamber, clusterStore, area, GetRecoParam());
1fef78c8 623
9bf6860b 624}
625
626 //__________________________________________________________________________
627void AliMUONVTrackReconstructor::AskForNewClustersInStation(const AliMUONTrackParam &trackParam,
628 AliMUONVClusterStore& clusterStore, Int_t station)
629{
630 /// Ask the clustering to reconstruct new clusters around the track candidate position
631 /// in the 2 chambers of the given station
632 AskForNewClustersInChamber(trackParam, clusterStore, 2*station+1);
633 AskForNewClustersInChamber(trackParam, clusterStore, 2*station);
1fef78c8 634}
635
636 //__________________________________________________________________________
96ebe67e 637Double_t AliMUONVTrackReconstructor::TryOneCluster(const AliMUONTrackParam &trackParam, AliMUONVCluster* cluster,
1fef78c8 638 AliMUONTrackParam &trackParamAtCluster, Bool_t updatePropagator)
ea94c18b 639{
96ebe67e 640/// Test the compatibility between the track and the cluster (using trackParam's covariance matrix):
ea94c18b 641/// return the corresponding Chi2
96ebe67e 642/// return trackParamAtCluster
ea94c18b 643
96ebe67e 644 // extrapolate track parameters and covariances at the z position of the tested cluster
4ea3f013 645 // and set pointer to cluster into trackParamAtCluster
96ebe67e 646 trackParamAtCluster = trackParam;
96ebe67e 647 trackParamAtCluster.SetClusterPtr(cluster);
4ea3f013 648 if (!AliMUONTrackExtrap::ExtrapToZCov(&trackParamAtCluster, cluster->GetZ(), updatePropagator))
649 return 2.*AliMUONTrack::MaxChi2();
ea94c18b 650
96ebe67e 651 // Set differences between trackParam and cluster in the bending and non bending directions
652 Double_t dX = cluster->GetX() - trackParamAtCluster.GetNonBendingCoor();
653 Double_t dY = cluster->GetY() - trackParamAtCluster.GetBendingCoor();
ea94c18b 654
019df241 655 // Calculate errors and covariances
96ebe67e 656 const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
657 Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
658 Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
6b191dea 659 Double_t covXY = kParamCov(0,2);
660 Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
019df241 661
662 // Compute chi2
4ea3f013 663 if (det == 0.) return 2.*AliMUONTrack::MaxChi2();
6b191dea 664 return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
019df241 665
666}
667
668 //__________________________________________________________________________
5a240757 669Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
019df241 670{
9bf6860b 671/// Test the compatibility between the track and the cluster
6b191dea 672/// given the track and cluster resolutions + the maximum-distance-to-track value
9bf6860b 673/// and assuming linear propagation of the track:
019df241 674/// return kTRUE if they are compatibles
675
96ebe67e 676 Double_t dZ = cluster->GetZ() - trackParam.GetZ();
677 Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
678 Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
9bf6860b 679 const TMatrixD& kParamCov = trackParam.GetCovariances();
6b191dea 680 Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
681 Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
9bf6860b 682
6b191dea 683 Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
a0dc65b4 684 GetRecoParam()->GetMaxNonBendingDistanceToTrack();
6b191dea 685 Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
a0dc65b4 686 GetRecoParam()->GetMaxBendingDistanceToTrack();
019df241 687
9bf6860b 688 if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
019df241 689
690 return kTRUE;
691
692}
693
694 //__________________________________________________________________________
96ebe67e 695Double_t AliMUONVTrackReconstructor::TryTwoClustersFast(const AliMUONTrackParam &trackParamAtCluster1, AliMUONVCluster* cluster2,
696 AliMUONTrackParam &trackParamAtCluster2)
019df241 697{
96ebe67e 698/// Test the compatibility between the track and the 2 clusters together (using trackParam's covariance matrix)
699/// assuming linear propagation between the two clusters:
700/// return the corresponding Chi2 accounting for covariances between the 2 clusters
701/// return trackParamAtCluster2
019df241 702
96ebe67e 703 // extrapolate linearly track parameters and covariances at the z position of the second cluster
704 trackParamAtCluster2 = trackParamAtCluster1;
3fe6651e 705 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParamAtCluster2, cluster2->GetZ());
019df241 706
96ebe67e 707 // set pointer to cluster2 into trackParamAtCluster2
708 trackParamAtCluster2.SetClusterPtr(cluster2);
019df241 709
96ebe67e 710 // Set differences between track and clusters in the bending and non bending directions
711 AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
712 Double_t dX1 = cluster1->GetX() - trackParamAtCluster1.GetNonBendingCoor();
713 Double_t dX2 = cluster2->GetX() - trackParamAtCluster2.GetNonBendingCoor();
714 Double_t dY1 = cluster1->GetY() - trackParamAtCluster1.GetBendingCoor();
715 Double_t dY2 = cluster2->GetY() - trackParamAtCluster2.GetBendingCoor();
019df241 716
717 // Calculate errors and covariances
96ebe67e 718 const TMatrixD& kParamCov1 = trackParamAtCluster1.GetCovariances();
719 const TMatrixD& kParamCov2 = trackParamAtCluster2.GetCovariances();
720 Double_t dZ = trackParamAtCluster2.GetZ() - trackParamAtCluster1.GetZ();
721 Double_t sigma2X1 = kParamCov1(0,0) + cluster1->GetErrX2();
722 Double_t sigma2X2 = kParamCov2(0,0) + cluster2->GetErrX2();
019df241 723 Double_t covX1X2 = kParamCov1(0,0) + dZ * kParamCov1(0,1);
96ebe67e 724 Double_t sigma2Y1 = kParamCov1(2,2) + cluster1->GetErrY2();
725 Double_t sigma2Y2 = kParamCov2(2,2) + cluster2->GetErrY2();
019df241 726 Double_t covY1Y2 = kParamCov1(2,2) + dZ * kParamCov1(2,3);
727
728 // Compute chi2
729 Double_t detX = sigma2X1 * sigma2X2 - covX1X2 * covX1X2;
730 Double_t detY = sigma2Y1 * sigma2Y2 - covY1Y2 * covY1Y2;
4ea3f013 731 if (detX == 0. || detY == 0.) return 2.*AliMUONTrack::MaxChi2();
019df241 732 return (dX1 * dX1 * sigma2X2 + dX2 * dX2 * sigma2X1 - 2. * dX1 * dX2 * covX1X2) / detX
733 + (dY1 * dY1 * sigma2Y2 + dY2 * dY2 * sigma2Y1 - 2. * dY1 * dY2 * covY1Y2) / detY;
734
735}
736
737 //__________________________________________________________________________
9bf6860b 738Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInChamber(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
739 Int_t nextChamber)
740{
741 /// Follow trackCandidate in chamber(0..) nextChamber assuming linear propagation, and search for compatible cluster(s)
742 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
743 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
744 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
745 /// Remove the obsolete "trackCandidate" at the end.
746 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
747 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
748 AliDebug(1,Form("Enter FollowLinearTrackInChamber(1..) %d", nextChamber+1));
749
4ea3f013 750 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
a0dc65b4 751 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
752 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
9bf6860b 753 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
754 Bool_t foundOneCluster = kFALSE;
755 AliMUONTrack *newTrack = 0x0;
756 AliMUONVCluster *cluster;
757 AliMUONTrackParam trackParam;
758 AliMUONTrackParam extrapTrackParamAtCluster;
759 AliMUONTrackParam bestTrackParamAtCluster;
760
761 // Get track parameters according to the propagation direction
762 if (nextChamber > 7) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
763 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
764
765 // Printout for debuging
766 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
767 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
768 trackParam.GetParameters().Print();
769 trackParam.GetCovariances().Print();
770 }
771
772 // Add MCS effect
4663da9f 773 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
9bf6860b 774
775 // Printout for debuging
776 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
777 cout << "FollowLinearTrackInChamber: look for cluster in chamber(1..): " << nextChamber+1 << endl;
778 }
779
780 // Create iterators to loop over clusters in chamber
781 TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
782
783 // look for candidates in chamber
784 while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
785
786 // try to add the current cluster fast
787 if (!TryOneClusterFast(trackParam, cluster)) continue;
788
789 // try to add the current cluster accuratly
790 extrapTrackParamAtCluster = trackParam;
3fe6651e 791 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster, cluster->GetZ());
9bf6860b 792 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster, cluster, extrapTrackParamAtCluster);
793
794 // if good chi2 then consider to add cluster
795 if (chi2WithOneCluster < maxChi2WithOneCluster) {
796 foundOneCluster = kTRUE;
797
798 // Printout for debuging
799 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
800 cout << "FollowLinearTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
801 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
802 cluster->Print();
803 }
804
a0dc65b4 805 if (GetRecoParam()->TrackAllTracks()) {
9bf6860b 806 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
807 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 808 if (GetRecoParam()->RequestStation(nextChamber/2))
9bf6860b 809 extrapTrackParamAtCluster.SetRemovable(kFALSE);
810 else extrapTrackParamAtCluster.SetRemovable(kTRUE);
811 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster,*cluster);
89c8d66d 812 newTrack->SetGlobalChi2(trackCandidate.GetGlobalChi2()+chi2WithOneCluster);
9bf6860b 813 fNRecTracks++;
814
815 // Printout for debuging
816 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
817 cout << "FollowLinearTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
818 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
819 }
820
821 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
822 // keep track of the best cluster
823 bestChi2WithOneCluster = chi2WithOneCluster;
824 bestTrackParamAtCluster = extrapTrackParamAtCluster;
825 }
826
827 }
828
829 }
830
831 // fill out the best track if required else clean up the fRecTracksPtr array
a0dc65b4 832 if (!GetRecoParam()->TrackAllTracks()) {
9bf6860b 833 if (foundOneCluster) {
a0dc65b4 834 if (GetRecoParam()->RequestStation(nextChamber/2))
9bf6860b 835 bestTrackParamAtCluster.SetRemovable(kFALSE);
836 else bestTrackParamAtCluster.SetRemovable(kTRUE);
837 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
89c8d66d 838 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
9bf6860b 839
840 // Printout for debuging
841 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
842 cout << "FollowLinearTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
843 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
844 }
845
846 } else return kFALSE;
847
848 } else if (foundOneCluster) {
849
850 // remove obsolete track
851 fRecTracksPtr->Remove(&trackCandidate);
852 fNRecTracks--;
853
854 } else return kFALSE;
855
856 return kTRUE;
857
858}
859
860//__________________________________________________________________________
96ebe67e 861Bool_t AliMUONVTrackReconstructor::FollowLinearTrackInStation(AliMUONTrack &trackCandidate, const AliMUONVClusterStore& clusterStore,
862 Int_t nextStation)
019df241 863{
96ebe67e 864 /// Follow trackCandidate in station(0..) nextStation assuming linear propagation, and search for compatible cluster(s)
019df241 865 /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
866 /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
867 /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
868 /// Remove the obsolete "trackCandidate" at the end.
96ebe67e 869 /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
870 /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
019df241 871 AliDebug(1,Form("Enter FollowLinearTrackInStation(1..) %d", nextStation+1));
872
873 // Order the chamber according to the propagation direction (tracking starts with chamber 2):
874 // - nextStation == station(1...) 5 => forward propagation
875 // - nextStation < station(1...) 5 => backward propagation
876 Int_t ch1, ch2;
877 if (nextStation==4) {
878 ch1 = 2*nextStation+1;
879 ch2 = 2*nextStation;
ea94c18b 880 } else {
019df241 881 ch1 = 2*nextStation;
882 ch2 = 2*nextStation+1;
ea94c18b 883 }
884
4ea3f013 885 Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
886 Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2();
a0dc65b4 887 Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
888 GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
889 Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
890 GetRecoParam()->GetSigmaCutForTracking(); // 4 because 4 quantities in chi2
96ebe67e 891 Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
892 Double_t bestChi2WithTwoClusters = maxChi2WithTwoClusters;
893 Bool_t foundOneCluster = kFALSE;
894 Bool_t foundTwoClusters = kFALSE;
019df241 895 AliMUONTrack *newTrack = 0x0;
96ebe67e 896 AliMUONVCluster *clusterCh1, *clusterCh2;
7332f213 897 AliMUONTrackParam trackParam;
96ebe67e 898 AliMUONTrackParam extrapTrackParamAtCluster1;
899 AliMUONTrackParam extrapTrackParamAtCluster2;
900 AliMUONTrackParam bestTrackParamAtCluster1;
901 AliMUONTrackParam bestTrackParamAtCluster2;
902
903 Int_t nClusters = clusterStore.GetSize();
904 Bool_t *clusterCh1Used = new Bool_t[nClusters];
905 for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
906 Int_t iCluster1;
019df241 907
7332f213 908 // Get track parameters according to the propagation direction
909 if (nextStation==4) trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
910 else trackParam = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
019df241 911
9bf6860b 912 // Printout for debuging
913 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
914 cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
915 trackParam.GetParameters().Print();
916 trackParam.GetCovariances().Print();
917 }
918
019df241 919 // Add MCS effect
4663da9f 920 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(trackParam.GetClusterPtr()->GetChamberId()),-1.);
019df241 921
922 // Printout for debuging
923 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 924 cout << "FollowLinearTrackInStation: look for clusters in chamber(1..): " << ch2+1 << endl;
019df241 925 }
926
96ebe67e 927 // Create iterators to loop over clusters in both chambers
928 TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
929 TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
930
931 // look for candidates in chamber 2
932 while ( ( clusterCh2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
019df241 933
96ebe67e 934 // try to add the current cluster fast
935 if (!TryOneClusterFast(trackParam, clusterCh2)) continue;
019df241 936
96ebe67e 937 // try to add the current cluster accuratly
938 extrapTrackParamAtCluster2 = trackParam;
3fe6651e 939 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster2, clusterCh2->GetZ());
96ebe67e 940 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster2, clusterCh2, extrapTrackParamAtCluster2);
019df241 941
96ebe67e 942 // if good chi2 then try to attach a cluster in the other chamber too
943 if (chi2WithOneCluster < maxChi2WithOneCluster) {
944 Bool_t foundSecondCluster = kFALSE;
019df241 945
946 // Printout for debuging
947 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 948 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch2+1
949 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 950 clusterCh2->Print();
96ebe67e 951 cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
019df241 952 }
953
954 // add MCS effect
4663da9f 955 AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
019df241 956
96ebe67e 957 // reset cluster iterator of chamber 1
958 nextInCh1.Reset();
959 iCluster1 = -1;
960
961 // look for second candidates in chamber 1
962 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
963 iCluster1++;
019df241 964
96ebe67e 965 // try to add the current cluster fast
966 if (!TryOneClusterFast(extrapTrackParamAtCluster2, clusterCh1)) continue;
019df241 967
96ebe67e 968 // try to add the current cluster in addition to the one found in the previous chamber
969 chi2WithTwoClusters = TryTwoClustersFast(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
019df241 970
96ebe67e 971 // if good chi2 then consider to add the 2 clusters to the "trackCandidate"
972 if (chi2WithTwoClusters < maxChi2WithTwoClusters) {
973 foundSecondCluster = kTRUE;
974 foundTwoClusters = kTRUE;
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..): " << ch1+1
9bf6860b 979 << " (Chi2 = " << chi2WithTwoClusters << ")" << endl;
980 clusterCh1->Print();
019df241 981 }
982
a0dc65b4 983 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 984 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
019df241 985 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
96ebe67e 986 extrapTrackParamAtCluster1.SetRemovable(kTRUE);
987 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
988 extrapTrackParamAtCluster2.SetRemovable(kTRUE);
989 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
89c8d66d 990 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithTwoClusters);
019df241 991 fNRecTracks++;
992
96ebe67e 993 // Tag clusterCh1 as used
994 clusterCh1Used[iCluster1] = kTRUE;
019df241 995
996 // Printout for debuging
997 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 998 cout << "FollowLinearTrackInStation: added two clusters in station(1..): " << nextStation+1 << endl;
019df241 999 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1000 }
1001
96ebe67e 1002 } else if (chi2WithTwoClusters < bestChi2WithTwoClusters) {
1003 // keep track of the best couple of clusters
1004 bestChi2WithTwoClusters = chi2WithTwoClusters;
1005 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
1006 bestTrackParamAtCluster2 = extrapTrackParamAtCluster2;
019df241 1007 }
1008
1009 }
1010
1011 }
1012
96ebe67e 1013 // if no cluster found in chamber1 then consider to add clusterCh2 only
1014 if (!foundSecondCluster) {
1015 foundOneCluster = kTRUE;
019df241 1016
a0dc65b4 1017 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 1018 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 1019 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 1020 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1021 extrapTrackParamAtCluster2.SetRemovable(kFALSE);
1022 else extrapTrackParamAtCluster2.SetRemovable(kTRUE);
96ebe67e 1023 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster2,*clusterCh2);
89c8d66d 1024 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
019df241 1025 fNRecTracks++;
1026
1027 // Printout for debuging
1028 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1029 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
019df241 1030 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1031 }
1032
96ebe67e 1033 } else if (!foundTwoClusters && chi2WithOneCluster < bestChi2WithOneCluster) {
1034 // keep track of the best cluster except if a couple of clusters has already been found
1035 bestChi2WithOneCluster = chi2WithOneCluster;
1036 bestTrackParamAtCluster1 = extrapTrackParamAtCluster2;
019df241 1037 }
1038
1039 }
1040
1041 }
1042
1043 }
1044
1045 // look for candidates in chamber 1 not already attached to a track
96ebe67e 1046 // if we want to keep all possible tracks or if no good couple of clusters has been found
a0dc65b4 1047 if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
019df241 1048
1049 // Printout for debuging
1050 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1051 cout << "FollowLinearTrackInStation: look for single cluster in chamber(1..): " << ch1+1 << endl;
019df241 1052 }
1053
1054 //Extrapolate trackCandidate to chamber "ch2"
3fe6651e 1055 AliMUONTrackExtrap::LinearExtrapToZCov(&trackParam, AliMUONConstants::DefaultChamberZ(ch2));
019df241 1056
1057 // add MCS effect for next step
4663da9f 1058 AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
9bf6860b 1059
96ebe67e 1060 // reset cluster iterator of chamber 1
1061 nextInCh1.Reset();
1062 iCluster1 = -1;
1063
1064 // look for second candidates in chamber 1
1065 while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
1066 iCluster1++;
019df241 1067
96ebe67e 1068 if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
019df241 1069
96ebe67e 1070 // try to add the current cluster fast
1071 if (!TryOneClusterFast(trackParam, clusterCh1)) continue;
9bf6860b 1072
96ebe67e 1073 // try to add the current cluster accuratly
1074 extrapTrackParamAtCluster1 = trackParam;
3fe6651e 1075 AliMUONTrackExtrap::LinearExtrapToZCov(&extrapTrackParamAtCluster1, clusterCh1->GetZ());
96ebe67e 1076 chi2WithOneCluster = TryOneCluster(extrapTrackParamAtCluster1, clusterCh1, extrapTrackParamAtCluster1);
9bf6860b 1077
96ebe67e 1078 // if good chi2 then consider to add clusterCh1
1079 // We do not try to attach a cluster in the other chamber too since it has already been done above
1080 if (chi2WithOneCluster < maxChi2WithOneCluster) {
1081 foundOneCluster = kTRUE;
019df241 1082
1083 // Printout for debuging
1084 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1085 cout << "FollowLinearTrackInStation: found one cluster in chamber(1..): " << ch1+1
1086 << " (Chi2 = " << chi2WithOneCluster << ")" << endl;
9bf6860b 1087 clusterCh1->Print();
019df241 1088 }
1089
a0dc65b4 1090 if (GetRecoParam()->TrackAllTracks()) {
96ebe67e 1091 // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
019df241 1092 newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
a0dc65b4 1093 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1094 extrapTrackParamAtCluster1.SetRemovable(kFALSE);
1095 else extrapTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 1096 newTrack->AddTrackParamAtCluster(extrapTrackParamAtCluster1,*clusterCh1);
89c8d66d 1097 newTrack->SetGlobalChi2(newTrack->GetGlobalChi2()+chi2WithOneCluster);
019df241 1098 fNRecTracks++;
1099
1100 // Printout for debuging
1101 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1102 cout << "FollowLinearTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
019df241 1103 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1104 }
1105
96ebe67e 1106 } else if (chi2WithOneCluster < bestChi2WithOneCluster) {
1107 // keep track of the best cluster except if a couple of clusters has already been found
1108 bestChi2WithOneCluster = chi2WithOneCluster;
1109 bestTrackParamAtCluster1 = extrapTrackParamAtCluster1;
019df241 1110 }
1111
1112 }
1113
1114 }
1115
1116 }
1117
1118 // fill out the best track if required else clean up the fRecTracksPtr array
a0dc65b4 1119 if (!GetRecoParam()->TrackAllTracks()) {
96ebe67e 1120 if (foundTwoClusters) {
1121 bestTrackParamAtCluster1.SetRemovable(kTRUE);
1122 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
1123 bestTrackParamAtCluster2.SetRemovable(kTRUE);
1124 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster2,*(bestTrackParamAtCluster2.GetClusterPtr()));
89c8d66d 1125 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithTwoClusters);
019df241 1126
1127 // Printout for debuging
1128 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1129 cout << "FollowLinearTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
019df241 1130 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1131 }
1132
96ebe67e 1133 } else if (foundOneCluster) {
a0dc65b4 1134 if (GetRecoParam()->RequestStation(nextStation))
9bf6860b 1135 bestTrackParamAtCluster1.SetRemovable(kFALSE);
1136 else bestTrackParamAtCluster1.SetRemovable(kTRUE);
96ebe67e 1137 trackCandidate.AddTrackParamAtCluster(bestTrackParamAtCluster1,*(bestTrackParamAtCluster1.GetClusterPtr()));
89c8d66d 1138 trackCandidate.SetGlobalChi2(trackCandidate.GetGlobalChi2()+bestChi2WithOneCluster);
019df241 1139
1140 // Printout for debuging
1141 if ((AliLog::GetDebugLevel("MUON","AliMUONVTrackReconstructor") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
96ebe67e 1142 cout << "FollowLinearTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
019df241 1143 if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
1144 }
1145
dd230855 1146 } else {
96ebe67e 1147 delete [] clusterCh1Used;
dd230855 1148 return kFALSE;
1149 }
019df241 1150
96ebe67e 1151 } else if (foundOneCluster || foundTwoClusters) {
019df241 1152
1153 // remove obsolete track
1154 fRecTracksPtr->Remove(&trackCandidate);
1155 fNRecTracks--;
1156
dd230855 1157 } else {
96ebe67e 1158 delete [] clusterCh1Used;
dd230855 1159 return kFALSE;
1160 }
ea94c18b 1161
96ebe67e 1162 delete [] clusterCh1Used;
019df241 1163 return kTRUE;
ea94c18b 1164
1165}
1166
7332f213 1167//__________________________________________________________________________
1168void AliMUONVTrackReconstructor::ImproveTracks()
1169{
1170 /// Improve tracks by removing clusters with local chi2 highter than the defined cut
1171 /// Recompute track parameters and covariances at the remaining clusters
1172 AliDebug(1,"Enter ImproveTracks");
1173
1174 AliMUONTrack *track, *nextTrack;
1175
7332f213 1176 track = (AliMUONTrack*) fRecTracksPtr->First();
1177 while (track) {
1178
1179 // prepare next track in case the actual track is suppressed
1180 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
1181
1182 ImproveTrack(*track);
1183
1184 // remove track if improvement failed
1185 if (!track->IsImproved()) {
1186 fRecTracksPtr->Remove(track);
1187 fNRecTracks--;
1188 }
1189
1190 track = nextTrack;
1191 }
1192
1193 // compress the array in case of some tracks have been removed
1194 fRecTracksPtr->Compress();
1195
1196}
1197
1198//__________________________________________________________________________
1199void AliMUONVTrackReconstructor::Finalize()
1200{
1201 /// Recompute track parameters and covariances at each attached cluster from those at the first one
2e2d0c44 1202 /// Set the label pointing to the corresponding MC track
4ea3f013 1203 /// Remove the track if finalization failed
7332f213 1204
4ea3f013 1205 AliMUONTrack *track, *nextTrack;
1206 Bool_t trackRemoved = kFALSE;
7332f213 1207
1208 track = (AliMUONTrack*) fRecTracksPtr->First();
1209 while (track) {
1210
4ea3f013 1211 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
7332f213 1212
4ea3f013 1213 if (FinalizeTrack(*track)) track->FindMCLabel();
1214 else {
1215 fRecTracksPtr->Remove(track);
1216 fNRecTracks--;
1217 trackRemoved = kTRUE;
1218 }
2e2d0c44 1219
4ea3f013 1220 track = nextTrack;
7332f213 1221
1222 }
1223
4ea3f013 1224 // compress array of tracks if needed
1225 if (trackRemoved) fRecTracksPtr->Compress();
1226
7332f213 1227}
1228
1229//__________________________________________________________________________
7ec3b9cf 1230void AliMUONVTrackReconstructor::ValidateTracksWithTrigger(AliMUONVTrackStore& trackStore,
1231 const AliMUONVTriggerTrackStore& triggerTrackStore,
1232 const AliMUONVTriggerStore& triggerStore,
1233 const AliMUONTrackHitPattern& trackHitPattern)
8d0843c6 1234{
1235 /// Try to match track from tracking system with trigger track
99c136e1 1236 AliCodeTimerAuto("",0);
fda59e58 1237
683cb6c5 1238 trackHitPattern.ExecuteValidation(trackStore, triggerTrackStore, triggerStore);
8d0843c6 1239}
1240
ea94c18b 1241 //__________________________________________________________________________
1242void AliMUONVTrackReconstructor::EventReconstructTrigger(const AliMUONTriggerCircuit& circuit,
1243 const AliMUONVTriggerStore& triggerStore,
1244 AliMUONVTriggerTrackStore& triggerTrackStore)
8d0843c6 1245{
71a2d3aa 1246 /// To make the trigger tracks from Local Trigger
7ec3b9cf 1247 AliDebug(1, "");
99c136e1 1248 AliCodeTimerAuto("",0);
bdfb6eef 1249
7ec3b9cf 1250 AliMUONGlobalTrigger* globalTrigger = triggerStore.Global();
e6b25a6e 1251
7ec3b9cf 1252 UChar_t gloTrigPat = 0;
e6b25a6e 1253
7ec3b9cf 1254 if (globalTrigger)
1255 {
1256 gloTrigPat = globalTrigger->GetGlobalResponse();
e6b25a6e 1257 }
1258
7ec3b9cf 1259 TIter next(triggerStore.CreateIterator());
1260 AliMUONLocalTrigger* locTrg(0x0);
8d0843c6 1261
bdfb6eef 1262 const Double_t kTrigNonBendReso = AliMUONConstants::TriggerNonBendingReso();
1263 const Double_t kTrigBendReso = AliMUONConstants::TriggerBendingReso();
1264 const Double_t kSqrt12 = TMath::Sqrt(12.);
7cf63da6 1265
7ec3b9cf 1266 AliMUONTriggerTrack triggerTrack;
bdfb6eef 1267 TMatrixD trigCov(3,3);
7ec3b9cf 1268
1269 while ( ( locTrg = static_cast<AliMUONLocalTrigger*>(next()) ) )
1270 {
bdfb6eef 1271 if ( locTrg->IsTrigX() && locTrg->IsTrigY() )
7ec3b9cf 1272 { // make Trigger Track if trigger in X and Y
bdfb6eef 1273
1274 Int_t localBoardId = locTrg->LoCircuit();
1275
32ab62c9 1276 Float_t y11 = circuit.GetY11Pos(localBoardId, locTrg->LoStripX());
bdfb6eef 1277 Float_t z11 = circuit.GetZ11Pos(localBoardId, locTrg->LoStripX());
7ec3b9cf 1278 // need first to convert deviation to [0-30]
1279 // (see AliMUONLocalTriggerBoard::LocalTrigger)
d72d7b9e 1280 Int_t deviation = locTrg->GetDeviation();
7ec3b9cf 1281 Int_t stripX21 = locTrg->LoStripX()+deviation+1;
32ab62c9 1282 Float_t y21 = circuit.GetY21Pos(localBoardId, stripX21);
bdfb6eef 1283 Float_t z21 = circuit.GetZ21Pos(localBoardId, stripX21);
32ab62c9 1284 Float_t x11 = circuit.GetX11Pos(localBoardId, locTrg->LoStripY());
7ec3b9cf 1285
bdfb6eef 1286 AliDebug(1, Form(" MakeTriggerTrack %3d %2d %2d %2d (%f %f %f) (%f %f)\n",locTrg->LoCircuit(),
1287 locTrg->LoStripX(),locTrg->LoStripX()+deviation+1,locTrg->LoStripY(),x11, y11, z11, y21, z21));
abc2458f 1288
bdfb6eef 1289
1290 Double_t deltaZ = z11 - z21;
7ec3b9cf 1291
bdfb6eef 1292 Float_t slopeX = x11/z11;
1293 Float_t slopeY = (y11-y21) / deltaZ;
1294
1295 Float_t sigmaX = circuit.GetX11Width(localBoardId, locTrg->LoStripY()) / kSqrt12;
1296 Float_t sigmaY = circuit.GetY11Width(localBoardId, locTrg->LoStripX()) / kSqrt12;
1297 Float_t sigmaY21 = circuit.GetY21Width(localBoardId, locTrg->LoStripX()) / kSqrt12;
1298
1299 trigCov.Zero();
1300 trigCov(0,0) = kTrigNonBendReso * kTrigNonBendReso + sigmaX * sigmaX;
1301 trigCov(1,1) = kTrigBendReso * kTrigBendReso + sigmaY * sigmaY;
1302 trigCov(2,2) =
1303 (2. * kTrigBendReso * kTrigBendReso + sigmaY * sigmaY + sigmaY21 * sigmaY21 ) / deltaZ / deltaZ;
1304 trigCov(1,2) = trigCov(2,1) = trigCov(1,1) / deltaZ;
1305
7ec3b9cf 1306 triggerTrack.SetX11(x11);
1307 triggerTrack.SetY11(y11);
bdfb6eef 1308 triggerTrack.SetZ11(z11);
1309 triggerTrack.SetZ21(z21);
1310 triggerTrack.SetSlopeX(slopeX);
1311 triggerTrack.SetSlopeY(slopeY);
7ec3b9cf 1312 triggerTrack.SetGTPattern(gloTrigPat);
32ab62c9 1313 triggerTrack.SetLoTrgNum(localBoardId);
bdfb6eef 1314 triggerTrack.SetCovariances(trigCov);
1315
7ec3b9cf 1316 triggerTrackStore.Add(triggerTrack);
1317 } // board is fired
e6b25a6e 1318 } // end of loop on Local Trigger
8d0843c6 1319}