Take into account common installation locations for includes
[u/mrichter/AliRoot.git] / MUON / AliMUONVTrackReconstructor.cxx
CommitLineData
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 97using std::cout;
98using std::endl;
78649106 99/// \cond CLASSIMP
8d0843c6 100ClassImp(AliMUONVTrackReconstructor) // Class implementation in ROOT context
78649106 101/// \endcond
8d0843c6 102
ea94c18b 103 //__________________________________________________________________________
a0dc65b4 104AliMUONVTrackReconstructor::AliMUONVTrackReconstructor(const AliMUONRecoParam* recoParam,
105 AliMUONVClusterServer* clusterServer)
106: TObject(),
107fRecTracksPtr(0x0),
108fNRecTracks(0),
109fClusterServer(clusterServer),
6b191dea 110fkRecoParam(recoParam),
4663da9f 111fMaxMCSAngle2(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 133AliMUONVTrackReconstructor::~AliMUONVTrackReconstructor()
8d0843c6 134{
135 /// Destructor for class AliMUONVTrackReconstructor
ea94c18b 136 delete fRecTracksPtr;
4663da9f 137 delete[] fMaxMCSAngle2;
8d0843c6 138}
139
ea94c18b 140 //__________________________________________________________________________
ea94c18b 141void 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 150void 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//__________________________________________________________________________
202Bool_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 282TClonesArray* 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
ea94c18b 395 //__________________________________________________________________________
89c8d66d 396void 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
455 //__________________________________________________________________________
ea94c18b 456void 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 //__________________________________________________________________________
498void 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 542void 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 //__________________________________________________________________________
566void 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
618 //__________________________________________________________________________
9bf6860b 619void 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 //__________________________________________________________________________
657void 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
666 //__________________________________________________________________________
96ebe67e 667Double_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 699Bool_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 725Double_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 768Bool_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 891Bool_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//__________________________________________________________________________
1198void 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//__________________________________________________________________________
1229void 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 1260void 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 1273void 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
cd859b17 1300 if (TriggerToTrack(circuit, *locTrg, triggerTrack, gloTrigPat))
1301 triggerTrackStore.Add(triggerTrack);
bdfb6eef 1302
7ec3b9cf 1303 } // board is fired
e6b25a6e 1304 } // end of loop on Local Trigger
8d0843c6 1305}
9f164762 1306
1307//__________________________________________________________________________
cd859b17 1308Bool_t AliMUONVTrackReconstructor::TriggerToTrack(const AliMUONTriggerCircuit& circuit,
9f164762 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
cd859b17 1335 if (TMath::Abs(z11) < 0.00001) return kFALSE;
1336
9f164762 1337 Double_t deltaZ = z11 - z21;
1338
1339 Float_t slopeX = x11/z11;
1340 Float_t slopeY = (y11-y21) / deltaZ;
1341
1342 Float_t sigmaX = circuit.GetX11Width(localBoardId, locTrg.LoStripY()) / kSqrt12;
1343 Float_t sigmaY = circuit.GetY11Width(localBoardId, locTrg.LoStripX()) / kSqrt12;
1344 Float_t sigmaY21 = circuit.GetY21Width(localBoardId, locTrg.LoStripX()) / kSqrt12;
1345
1346 trigCov.Zero();
1347 trigCov(0,0) = kTrigNonBendReso * kTrigNonBendReso + sigmaX * sigmaX;
1348 trigCov(1,1) = kTrigBendReso * kTrigBendReso + sigmaY * sigmaY;
1349 trigCov(2,2) =
1350 (2. * kTrigBendReso * kTrigBendReso + sigmaY * sigmaY + sigmaY21 * sigmaY21 ) / deltaZ / deltaZ;
1351 trigCov(1,2) = trigCov(2,1) = trigCov(1,1) / deltaZ;
1352
1353 triggerTrack.SetX11(x11);
1354 triggerTrack.SetY11(y11);
1355 triggerTrack.SetZ11(z11);
1356 triggerTrack.SetZ21(z21);
1357 triggerTrack.SetSlopeX(slopeX);
1358 triggerTrack.SetSlopeY(slopeY);
1359 triggerTrack.SetGTPattern(globalTriggerPattern);
1360 triggerTrack.SetLoTrgNum(localBoardId);
1361 triggerTrack.SetCovariances(trigCov);
1362 triggerTrack.SetUniqueID(locTrg.GetUniqueID());
cd859b17 1363
1364 return kTRUE;
1365
9f164762 1366}