1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ////////////////////////////////////
20 // MUON track reconstructor in ALICE (class renamed from AliMUONEventReconstructor)
22 // This class contains as data:
23 // * the parameters for the track reconstruction
24 // * a pointer to the array of hits to be reconstructed (the event)
25 // * a pointer to the array of segments made with these hits inside each station
26 // * a pointer to the array of reconstructed tracks
28 // It contains as methods, among others:
29 // * MakeEventToBeReconstructed to build the array of hits to be reconstructed
30 // * MakeSegments to build the segments
31 // * MakeTracks to build the tracks
33 ////////////////////////////////////
36 #include <Riostream.h>
37 #include <TDirectory.h>
41 #include "AliMUONTrackReconstructor.h"
43 #include "AliMUONConstants.h"
44 #include "AliMUONHitForRec.h"
45 #include "AliMUONTriggerTrack.h"
46 #include "AliMUONTriggerCircuit.h"
47 #include "AliMUONRawCluster.h"
48 #include "AliMUONLocalTrigger.h"
49 #include "AliMUONGlobalTrigger.h"
50 #include "AliMUONSegment.h"
51 #include "AliMUONTrack.h"
52 #include "AliMUONTrackHit.h"
54 #include "AliRun.h" // for gAlice
55 #include "AliRunLoader.h"
56 #include "AliLoader.h"
57 #include "AliMUONTrackK.h"
60 #include "AliTrackReference.h"
62 //************* Defaults parameters for reconstruction
63 const Double_t AliMUONTrackReconstructor::fgkDefaultMinBendingMomentum = 3.0;
64 const Double_t AliMUONTrackReconstructor::fgkDefaultMaxBendingMomentum = 3000.0;
65 const Double_t AliMUONTrackReconstructor::fgkDefaultMaxChi2 = 100.0;
66 const Double_t AliMUONTrackReconstructor::fgkDefaultMaxSigma2Distance = 16.0;
67 const Double_t AliMUONTrackReconstructor::fgkDefaultBendingResolution = 0.01;
68 const Double_t AliMUONTrackReconstructor::fgkDefaultNonBendingResolution = 0.144;
69 const Double_t AliMUONTrackReconstructor::fgkDefaultChamberThicknessInX0 = 0.03;
70 // Simple magnetic field:
71 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
72 // Length and Position from reco_muon.F, with opposite sign:
73 // Length = ZMAGEND-ZCOIL
74 // Position = (ZMAGEND+ZCOIL)/2
75 // to be ajusted differently from real magnetic field ????
76 const Double_t AliMUONTrackReconstructor::fgkDefaultSimpleBValue = 7.0;
77 const Double_t AliMUONTrackReconstructor::fgkDefaultSimpleBLength = 428.0;
78 const Double_t AliMUONTrackReconstructor::fgkDefaultSimpleBPosition = 1019.0;
79 const Int_t AliMUONTrackReconstructor::fgkDefaultRecTrackRefHits = 0;
80 const Double_t AliMUONTrackReconstructor::fgkDefaultEfficiency = 0.95;
82 ClassImp(AliMUONTrackReconstructor) // Class implementation in ROOT context
84 //__________________________________________________________________________
85 AliMUONTrackReconstructor::AliMUONTrackReconstructor(AliLoader* loader, AliMUONData* data)
88 // Constructor for class AliMUONTrackReconstructor
89 SetReconstructionParametersToDefaults();
90 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
91 // Memory allocation for the TClonesArray of hits for reconstruction
92 // Is 10000 the right size ????
93 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
94 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
95 // Memory allocation for the TClonesArray's of segments in stations
96 // Is 2000 the right size ????
97 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) {
98 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
99 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
101 // Memory allocation for the TClonesArray of reconstructed tracks
102 // Is 10 the right size ????
103 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
104 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
105 // Memory allocation for the TClonesArray of hits on reconstructed tracks
106 // Is 100 the right size ????
107 fRecTrackHitsPtr = new TClonesArray("AliMUONTrackHit", 100);
108 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
110 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
112 x[0] = 50.; x[1] = 50.; x[2] = -950.;
113 gAlice->Field()->Field(x, b);
114 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
115 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
116 // See how to get fSimple(BValue, BLength, BPosition)
117 // automatically calculated from the actual magnetic field ????
119 AliDebug(1,"AliMUONTrackReconstructor constructed with defaults");
120 if ( AliLog::GetGlobalDebugLevel()>0) Dump();
121 AliDebug(1,"Magnetic field from root file:");
122 if ( AliLog::GetGlobalDebugLevel()>0) gAlice->Field()->Dump();
125 // Initializions for track ref. background events
126 fBkgTrackRefFile = 0;
128 fBkgTrackRefParticles = 0;
130 fBkgTrackRefEventNumber = -1;
132 // initialize loader's
135 // initialize container
136 // fMUONData = new AliMUONData(fLoader,"MUON","MUON");
141 //__________________________________________________________________________
142 AliMUONTrackReconstructor::AliMUONTrackReconstructor (const AliMUONTrackReconstructor& rhs)
145 // Protected copy constructor
147 AliFatal("Not implemented.");
150 AliMUONTrackReconstructor &
151 AliMUONTrackReconstructor::operator=(const AliMUONTrackReconstructor& rhs)
153 // Protected assignement operator
155 if (this == &rhs) return *this;
157 AliFatal("Not implemented.");
162 //__________________________________________________________________________
163 AliMUONTrackReconstructor::~AliMUONTrackReconstructor(void)
165 // Destructor for class AliMUONTrackReconstructor
166 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
167 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++)
168 delete fSegmentsPtr[st]; // Correct destruction of everything ????
172 //__________________________________________________________________________
173 void AliMUONTrackReconstructor::SetReconstructionParametersToDefaults(void)
175 // Set reconstruction parameters to default values
176 // Would be much more convenient with a structure (or class) ????
177 fMinBendingMomentum = fgkDefaultMinBendingMomentum;
178 fMaxBendingMomentum = fgkDefaultMaxBendingMomentum;
179 fMaxChi2 = fgkDefaultMaxChi2;
180 fMaxSigma2Distance = fgkDefaultMaxSigma2Distance;
182 // ******** Parameters for making HitsForRec
184 // like in TRACKF_STAT:
185 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
186 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
187 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
188 if (ch < 4) fRMin[ch] = TMath::Abs(AliMUONConstants::DefaultChamberZ(ch)) *
189 2.0 * TMath::Pi() / 180.0;
190 else fRMin[ch] = 30.0;
191 // maximum radius at 10 degrees and Z of chamber
192 fRMax[ch] = TMath::Abs(AliMUONConstants::DefaultChamberZ(ch)) *
193 10.0 * TMath::Pi() / 180.0;
196 // ******** Parameters for making segments
197 // should be parametrized ????
198 // according to interval between chambers in a station ????
199 // Maximum distance in non bending plane
200 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
202 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++)
203 fSegmentMaxDistNonBending[st] = 5. * 0.22;
204 // Maximum distance in bending plane:
205 // values from TRACKF_STAT, corresponding to (J psi 20cm),
206 // scaled to the real distance between chambers in a station
207 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
208 (AliMUONConstants::DefaultChamberZ(1) - AliMUONConstants::DefaultChamberZ(0)) / 20.0);
209 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
210 (AliMUONConstants::DefaultChamberZ(3) - AliMUONConstants::DefaultChamberZ(2)) / 20.0);
211 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
212 (AliMUONConstants::DefaultChamberZ(5) - AliMUONConstants::DefaultChamberZ(4)) / 20.0);
213 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
214 (AliMUONConstants::DefaultChamberZ(7) - AliMUONConstants::DefaultChamberZ(6)) / 20.0);
215 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
216 (AliMUONConstants::DefaultChamberZ(9) - AliMUONConstants::DefaultChamberZ(8)) / 20.0);
219 fBendingResolution = fgkDefaultBendingResolution;
220 fNonBendingResolution = fgkDefaultNonBendingResolution;
221 fChamberThicknessInX0 = fgkDefaultChamberThicknessInX0;
222 fSimpleBValue = fgkDefaultSimpleBValue;
223 fSimpleBLength = fgkDefaultSimpleBLength;
224 fSimpleBPosition = fgkDefaultSimpleBPosition;
225 fRecTrackRefHits = fgkDefaultRecTrackRefHits;
226 fEfficiency = fgkDefaultEfficiency;
230 //__________________________________________________________________________
231 Double_t AliMUONTrackReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
233 // Returns impact parameter at vertex in bending plane (cm),
234 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
235 // using simple values for dipole magnetic field.
236 // The sign of "BendingMomentum" is the sign of the charge.
237 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
241 //__________________________________________________________________________
242 Double_t AliMUONTrackReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
244 // Returns signed bending momentum in bending plane (GeV/c),
245 // the sign being the sign of the charge for particles moving forward in Z,
246 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
247 // using simple values for dipole magnetic field.
248 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
252 //__________________________________________________________________________
253 void AliMUONTrackReconstructor::SetBkgTrackRefFile(Text_t *BkgTrackRefFileName)
255 // Set background file ... for track ref. hits
256 // Must be called after having loaded the firts signal event
257 AliDebug(1,Form("Enter SetBkgTrackRefFile with BkgTrackRefFileName %s",BkgTrackRefFileName));
259 if (strlen(BkgTrackRefFileName)) {
260 // BkgTrackRefFileName not empty: try to open the file
262 if(AliLog::GetGlobalDebugLevel()>1) {
263 cout << "Before File(Bkg)" << endl; gDirectory->Dump();
265 fBkgTrackRefFile = new TFile(BkgTrackRefFileName);
266 if(AliLog::GetGlobalDebugLevel()>1) {
267 cout << "After File(Bkg)" << endl; gDirectory->Dump();
269 if (fBkgTrackRefFile-> IsOpen()) {
270 if(AliLog::GetGlobalDebugLevel()>0) {
271 cout << "Background for Track ref. hits in file: ``" << BkgTrackRefFileName
272 << "'' successfully opened" << endl;}
275 cout << "Background for Track Ref. hits in file: " << BkgTrackRefFileName << endl;
276 cout << "NOT FOUND: EXIT" << endl;
277 exit(0); // right instruction for exit ????
279 // Arrays for "particles" and "hits"
280 fBkgTrackRefParticles = new TClonesArray("TParticle", 200);
281 // Event number to -1 for initialization
282 fBkgTrackRefEventNumber = -1;
283 // Back to the signal file:
284 // first signal event must have been loaded previously,
285 // otherwise, Segmentation violation at the next instruction
286 // How is it possible to do smething better ????
287 ((gAlice->TreeK())->GetCurrentFile())->cd();
288 if(AliLog::GetGlobalDebugLevel()>1) cout << "After cd(gAlice)" << endl; gDirectory->Dump();
293 //__________________________________________________________________________
294 void AliMUONTrackReconstructor::NextBkgTrackRefEvent(void)
296 // Get next event in background file for track ref. hits
297 // Goes back to event number 0 when end of file is reached
300 AliDebug(1,"Enter NextBkgTrackRefEvent");
301 // Clean previous event
302 if(fBkgTrackRefTK) delete fBkgTrackRefTK;
303 fBkgTrackRefTK = NULL;
304 if(fBkgTrackRefParticles) fBkgTrackRefParticles->Clear();
305 if(fBkgTrackRefTTR) delete fBkgTrackRefTTR;
306 fBkgTrackRefTTR = NULL;
307 // Increment event number
308 fBkgTrackRefEventNumber++;
309 // Get access to Particles and Hits for event from background file
310 if (AliLog::GetGlobalDebugLevel()>1) cout << "Before cd(Bkg)" << endl; gDirectory->Dump();
311 fBkgTrackRefFile->cd();
312 if (AliLog::GetGlobalDebugLevel()>1) cout << "After cd(Bkg)" << endl; gDirectory->Dump();
313 // Particles: TreeK for event and branch "Particles"
314 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
315 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
316 if (!fBkgTrackRefTK) {
318 AliDebug(1,Form("Cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber));
319 AliDebug(1,"Goes back to event 0");
321 fBkgTrackRefEventNumber = 0;
322 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
323 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
324 if (!fBkgTrackRefTK) {
325 AliError(Form("cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber));
330 fBkgTrackRefTK->SetBranchAddress("Particles", &fBkgTrackRefParticles);
331 fBkgTrackRefTK->GetEvent(0); // why event 0 ???? necessary ????
332 // Hits: TreeH for event and branch "MUON"
333 sprintf(treeName, "TreeTR%d", fBkgTrackRefEventNumber);
334 fBkgTrackRefTTR = (TTree*)gDirectory->Get(treeName);
335 if (!fBkgTrackRefTTR) {
336 AliError(Form("cannot find Hits Tree for background event: %d",fBkgTrackRefEventNumber));
339 fBkgTrackRefTTR->GetEntries(); // necessary ????
340 // Back to the signal file
341 ((gAlice->TreeK())->GetCurrentFile())->cd();
342 if (AliLog::GetGlobalDebugLevel()>1)
343 cout << "After cd(gAlice)" << endl; gDirectory->Dump();
347 //__________________________________________________________________________
348 void AliMUONTrackReconstructor::EventReconstruct(void)
350 // To reconstruct one event
351 AliDebug(1,"Enter EventReconstruct");
353 ResetTrackHits(); //AZ
354 ResetSegments(); //AZ
355 ResetHitsForRec(); //AZ
356 MakeEventToBeReconstructed();
359 if (fMUONData->IsTriggerTrackBranchesInTree())
360 ValidateTracksWithTrigger();
362 // Add tracks to MUON data container
363 for(Int_t i=0; i<GetNRecTracks(); i++) {
364 AliMUONTrack * track = (AliMUONTrack*) GetRecTracksPtr()->At(i);
365 fMUONData->AddRecTrack(*track);
371 //__________________________________________________________________________
372 void AliMUONTrackReconstructor::EventReconstructTrigger(void)
374 // To reconstruct one event
375 AliDebug(1,"Enter EventReconstructTrigger");
380 //__________________________________________________________________________
381 void AliMUONTrackReconstructor::ResetHitsForRec(void)
383 // To reset the array and the number of HitsForRec,
384 // and also the number of HitsForRec
385 // and the index of the first HitForRec per chamber
386 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
388 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++)
389 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
393 //__________________________________________________________________________
394 void AliMUONTrackReconstructor::ResetSegments(void)
396 // To reset the TClonesArray of segments and the number of Segments
398 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) {
399 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
405 //__________________________________________________________________________
406 void AliMUONTrackReconstructor::ResetTracks(void)
408 // To reset the TClonesArray of reconstructed tracks
409 if (fRecTracksPtr) fRecTracksPtr->Delete();
410 // Delete in order that the Track destructors are called,
411 // hence the space for the TClonesArray of pointers to TrackHit's is freed
417 //__________________________________________________________________________
418 void AliMUONTrackReconstructor::ResetTrackHits(void)
420 // To reset the TClonesArray of hits on reconstructed tracks
421 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
426 //__________________________________________________________________________
427 void AliMUONTrackReconstructor::MakeEventToBeReconstructed(void)
429 // To make the list of hits to be reconstructed,
430 // either from the track ref. hits or from the raw clusters
431 // according to the parameter set for the reconstructor
432 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
434 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
437 // Error("MakeEventToBeReconstructed",
438 // "Can not find Run Loader in Event Folder named %s.",
439 // evfoldname.Data());
442 // AliLoader* gime = rl->GetLoader("MUONLoader");
445 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
448 AliRunLoader *runLoader = fLoader->GetRunLoader();
450 AliDebug(1,"Enter MakeEventToBeReconstructed");
451 //AZ ResetHitsForRec();
452 if (fRecTrackRefHits == 1) {
453 // Reconstruction from track ref. hits
454 // Back to the signal file
455 TTree* treeTR = runLoader->TreeTR();
458 Int_t retval = runLoader->LoadTrackRefs("READ");
461 AliError("Error occured while loading hits.");
464 treeTR = runLoader->TreeTR();
467 AliError("Can not get TreeTR");
472 AddHitsForRecFromTrackRef(treeTR,1);
475 AddHitsForRecFromTrackRef(fBkgTrackRefTTR,0);
476 // Sort HitsForRec in increasing order with respect to chamber number
477 SortHitsForRecWithIncreasingChamber();
480 // Reconstruction from raw clusters
481 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
482 // Security on MUON ????
483 // TreeR assumed to be be "prepared" in calling function
484 // by "MUON->GetTreeR(nev)" ????
485 TTree *treeR = fLoader->TreeR();
486 //AZ? fMUONData->SetTreeAddress("RC");
487 AddHitsForRecFromRawClusters(treeR);
488 // No sorting: it is done automatically in the previous function
491 AliDebug(1,"End of MakeEventToBeReconstructed");
492 if (AliLog::GetGlobalDebugLevel() > 0) {
493 AliDebug(1, Form("NHitsForRec: %d",fNHitsForRec));
494 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
495 AliDebug(1, Form("Chamber(0...): %d",ch));
496 AliDebug(1, Form("NHitsForRec: %d", fNHitsForRecPerChamber[ch]));
497 AliDebug(1, Form("Index(first HitForRec): %d", fIndexOfFirstHitForRecPerChamber[ch]));
498 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
499 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
501 AliDebug(1, Form("HitForRec index(0...): %d",hit));
502 ((*fHitsForRecPtr)[hit])->Dump();
509 //__________________________________________________________________________
510 void AliMUONTrackReconstructor::AddHitsForRecFromTrackRef(TTree *TTR, Int_t signal)
512 // To add to the list of hits for reconstruction
513 // the signal hits from a track reference tree TreeTR.
514 TClonesArray *listOfTrackRefs = NULL;
515 AliTrackReference *trackRef;
518 AliDebug(2,Form("Enter AddHitsForRecFromTrackRef with TTR: %d", TTR));
519 if (TTR == NULL) return;
521 listOfTrackRefs = CleanTrackRefs(TTR);
523 Int_t ntracks = listOfTrackRefs->GetEntriesFast();
525 AliDebug(2,Form("ntracks: %d", ntracks));
527 for (Int_t index = 0; index < ntracks; index++) {
528 trackRef = (AliTrackReference*) listOfTrackRefs->At(index);
529 track = trackRef->GetTrack();
531 NewHitForRecFromTrackRef(trackRef,track,signal);
532 } // end of track ref.
534 listOfTrackRefs->Delete();
535 delete listOfTrackRefs;
540 //__________________________________________________________________________
541 AliMUONHitForRec* AliMUONTrackReconstructor::NewHitForRecFromTrackRef(AliTrackReference* Hit, Int_t TrackNumber, Int_t Signal)
543 // To make a new hit for reconstruction from a track ref. hit pointed to by "Hit",
544 // with the track numbered "TrackNumber",
545 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
546 // Selects hits in tracking (not trigger) chambers.
547 // Takes into account the efficiency (fEfficiency)
548 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
549 // Adds a condition on the radius between RMin and RMax
550 // to better simulate the real chambers.
551 // Returns the pointer to the new hit for reconstruction,
552 // or NULL in case of inefficiency or non tracking chamber or bad radius.
553 // No condition on at most 20 cm from a muon from a resonance
554 // like in Fortran TRACKF_STAT.
555 AliMUONHitForRec* hitForRec;
556 Double_t bendCoor, nonBendCoor, radius;
557 Int_t chamber = AliMUONConstants::ChamberNumber(Hit->Z()); // chamber(0...)
558 if (chamber < 0) return NULL;
559 // only in tracking chambers (fChamber starts at 1)
560 if (chamber >= AliMUONConstants::NTrackingCh()) return NULL;
561 // only if hit is efficient (keep track for checking ????)
562 if (gRandom->Rndm() > fEfficiency) return NULL;
563 // only if radius between RMin and RMax
565 nonBendCoor = Hit->X();
566 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
567 // This cut is not needed with a realistic chamber geometry !!!!
568 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
569 // new AliMUONHitForRec from track ref. hit and increment number of AliMUONHitForRec's
570 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
572 // add smearing from resolution
573 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
574 hitForRec->SetNonBendingCoor(nonBendCoor
575 + gRandom->Gaus(0., fNonBendingResolution));
576 // // !!!! without smearing
577 // hitForRec->SetBendingCoor(bendCoor);
578 // hitForRec->SetNonBendingCoor(nonBendCoor);
579 // more information into HitForRec
580 // resolution: angular effect to be added here ????
581 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
582 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
584 hitForRec->SetTTRTrack(TrackNumber);
585 hitForRec->SetTrackRefSignal(Signal);
586 if (AliLog::GetGlobalDebugLevel()> 1) {
587 AliDebug(2,Form("Track: %d", TrackNumber));
589 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
594 //__________________________________________________________________________
595 TClonesArray* AliMUONTrackReconstructor::CleanTrackRefs(TTree *treeTR)
597 // Make hits from track ref..
598 // Re-calculate hits parameters because two AliTrackReferences are recorded for
599 // each chamber (one when particle is entering + one when particle is leaving
600 // the sensitive volume)
602 AliTrackReference *trackReference;
603 Float_t x1, y1, z1, pX1, pY1, pZ1;
604 Float_t x2, y2, z2, pX2, pY2, pZ2;
605 Int_t track1, track2;
607 Float_t maxGasGap = 1.; // cm
611 AliTrackReference *trackReferenceNew = new AliTrackReference();
613 TClonesArray* trackRefs = new TClonesArray("AliTrackReference", 10);
614 TClonesArray* cleanTrackRefs = new TClonesArray("AliTrackReference", 10);
616 if (treeTR == NULL) return NULL;
617 TBranch* branch = treeTR->GetBranch("MUON");
618 if (branch == NULL) return NULL;
619 branch->SetAddress(&trackRefs);
621 Int_t nTrack = (Int_t)treeTR->GetEntries();
622 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
623 treeTR->GetEntry(iTrack);
626 while (iHit1 < trackRefs->GetEntries()) {
627 trackReference = (AliTrackReference*)trackRefs->At(iHit1);
628 x1 = trackReference->X();
629 y1 = trackReference->Y();
630 z1 = trackReference->Z();
631 pX1 = trackReference->Px();
632 pY1 = trackReference->Py();
633 pZ1 = trackReference->Pz();
634 track1 = trackReference->GetTrack();
637 for (Int_t iHit2 = iHit1+1; iHit2 < trackRefs->GetEntries(); iHit2++) {
638 trackReference = (AliTrackReference*)trackRefs->At(iHit2);
639 x2 = trackReference->X();
640 y2 = trackReference->Y();
641 z2 = trackReference->Z();
642 pX2 = trackReference->Px();
643 pY2 = trackReference->Py();
644 pZ2 = trackReference->Pz();
645 track2 = trackReference->GetTrack();
646 if (track2 == track1 && TMath::Abs(z2-z1) < maxGasGap ) {
661 pX1 /= (Float_t)nRec;
662 pY1 /= (Float_t)nRec;
663 pZ1 /= (Float_t)nRec;
664 trackReferenceNew->SetPosition(x1,y1,z1);
665 trackReferenceNew->SetMomentum(pX1,pY1,pZ1);
666 trackReferenceNew->SetTrack(track1);
667 {new ((*cleanTrackRefs)[cleanTrackRefs->GetEntriesFast()]) AliTrackReference(*trackReferenceNew);}
674 delete trackReferenceNew;
675 return cleanTrackRefs;
678 //__________________________________________________________________________
679 void AliMUONTrackReconstructor::SortHitsForRecWithIncreasingChamber()
681 // Sort HitsForRec's in increasing order with respect to chamber number.
682 // Uses the function "Compare".
683 // Update the information for HitsForRec per chamber too.
684 Int_t ch, nhits, prevch;
685 fHitsForRecPtr->Sort();
686 for (ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
687 fNHitsForRecPerChamber[ch] = 0;
688 fIndexOfFirstHitForRecPerChamber[ch] = 0;
690 prevch = 0; // previous chamber
691 nhits = 0; // number of hits in current chamber
692 // Loop over HitsForRec
693 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
694 // chamber number (0...)
695 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
696 // increment number of hits in current chamber
697 (fNHitsForRecPerChamber[ch])++;
698 // update index of first HitForRec in current chamber
699 // if chamber number different from previous one
701 fIndexOfFirstHitForRecPerChamber[ch] = hit;
708 //__________________________________________________________________________
709 void AliMUONTrackReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
711 // To add to the list of hits for reconstruction all the raw clusters
712 // No condition added, like in Fortran TRACKF_STAT,
713 // on the radius between RMin and RMax.
714 AliMUONHitForRec *hitForRec;
715 AliMUONRawCluster *clus;
716 Int_t iclus, nclus, nTRentries;
717 TClonesArray *rawclusters;
718 AliDebug(1,"Enter AddHitsForRecFromRawClusters");
720 if (fTrackMethod != 3) { //AZ
721 fMUONData->SetTreeAddress("RC"); //AZ
722 nTRentries = Int_t(TR->GetEntries());
723 if (nTRentries != 1) {
724 AliError(Form("nTRentries = %d not equal to 1 ",nTRentries));
727 fLoader->TreeR()->GetEvent(0); // only one entry
730 // Loop over tracking chambers
731 for (Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
732 // number of HitsForRec to 0 for the chamber
733 fNHitsForRecPerChamber[ch] = 0;
734 // index of first HitForRec for the chamber
735 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
736 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
737 rawclusters =fMUONData->RawClusters(ch);
738 // pMUON->ResetRawClusters();
739 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
740 nclus = (Int_t) (rawclusters->GetEntries());
741 // Loop over (cathode correlated) raw clusters
742 for (iclus = 0; iclus < nclus; iclus++) {
743 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
744 // new AliMUONHitForRec from raw cluster
745 // and increment number of AliMUONHitForRec's (total and in chamber)
746 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
748 (fNHitsForRecPerChamber[ch])++;
749 // more information into HitForRec
750 // resolution: info should be already in raw cluster and taken from it ????
751 //hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
752 //hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
753 hitForRec->SetBendingReso2(clus->GetErrY() * clus->GetErrY());
754 hitForRec->SetNonBendingReso2(clus->GetErrX() * clus->GetErrX());
755 // original raw cluster
756 hitForRec->SetChamberNumber(ch);
757 hitForRec->SetHitNumber(iclus);
758 // Z coordinate of the raw cluster (cm)
759 hitForRec->SetZ(clus->GetZ(0));
760 if (AliLog::GetGlobalDebugLevel() > 1) {
761 cout << "chamber (0...): " << ch <<
762 " raw cluster (0...): " << iclus << endl;
764 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
766 } // end of cluster loop
767 } // end of chamber loop
768 SortHitsForRecWithIncreasingChamber();
772 //__________________________________________________________________________
773 void AliMUONTrackReconstructor::MakeSegments(void)
775 // To make the list of segments in all stations,
776 // from the list of hits to be reconstructed
777 AliDebug(1,"Enter MakeSegments");
778 //AZ ResetSegments();
779 // Loop over stations
780 Int_t nb = (fTrackMethod != 1) ? 3 : 0; //AZ
781 for (Int_t st = nb; st < AliMUONConstants::NTrackingCh()/2; st++)
782 MakeSegmentsPerStation(st);
783 if (AliLog::GetGlobalDebugLevel() > 1) {
784 cout << "end of MakeSegments" << endl;
785 for (Int_t st = 0; st < AliMUONConstants::NTrackingCh()/2; st++) {
786 cout << "station(0...): " << st
787 << " Segments: " << fNSegments[st]
790 seg < fNSegments[st];
792 cout << "Segment index(0...): " << seg << endl;
793 ((*fSegmentsPtr[st])[seg])->Dump();
800 //__________________________________________________________________________
801 void AliMUONTrackReconstructor::MakeSegmentsPerStation(Int_t Station)
803 // To make the list of segments in station number "Station" (0...)
804 // from the list of hits to be reconstructed.
805 // Updates "fNSegments"[Station].
806 // Segments in stations 4 and 5 are sorted
807 // according to increasing absolute value of "impact parameter"
808 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
809 AliMUONSegment *segment;
811 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
812 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
813 AliDebug(1,Form("Enter MakeSegmentsPerStation (0...) %d",Station));
814 // first and second chambers (0...) in the station
815 Int_t ch1 = 2 * Station;
817 // variable true for stations downstream of the dipole:
818 // Station(0..4) equal to 3 or 4
819 if ((Station == 3) || (Station == 4)) {
821 // maximum impact parameter (cm) according to fMinBendingMomentum...
823 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
824 // minimum impact parameter (cm) according to fMaxBendingMomentum...
826 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
828 else last2st = kFALSE;
829 // extrapolation factor from Z of first chamber to Z of second chamber
830 // dZ to be changed to take into account fine structure of chambers ????
832 // index for current segment
833 Int_t segmentIndex = 0;
834 // Loop over HitsForRec in the first chamber of the station
835 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
836 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
838 // pointer to the HitForRec
839 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
841 // on the straight line joining the HitForRec to the vertex (0,0,0),
842 // to the Z of the second chamber of the station
843 // Loop over HitsForRec in the second chamber of the station
844 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
845 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
847 // pointer to the HitForRec
848 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
849 // absolute values of distances, in bending and non bending planes,
850 // between the HitForRec in the second chamber
851 // and the previous extrapolation
852 extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ();
853 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
854 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
855 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
856 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
859 if ( hit1Ptr->GetZ() - hit2Ptr->GetZ() != 0.0 ) {
860 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
861 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
862 // absolute value of impact parameter
864 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
867 AliWarning("hit1Ptr->GetZ() = hit2Ptr->GetZ(): impactParam set to maxImpactParam");
868 impactParam = maxImpactParam;
871 // check for distances not too large,
872 // and impact parameter not too big if stations downstream of the dipole.
873 // Conditions "distBend" and "impactParam" correlated for these stations ????
874 if ((distBend < fSegmentMaxDistBending[Station]) &&
875 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
876 (!last2st || (impactParam < maxImpactParam)) &&
877 (!last2st || (impactParam > minImpactParam))) {
879 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
880 AliMUONSegment(hit1Ptr, hit2Ptr);
881 // update "link" to this segment from the hit in the first chamber
882 if (hit1Ptr->GetNSegments() == 0)
883 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
884 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
885 if (AliLog::GetGlobalDebugLevel() > 1) {
886 cout << "segmentIndex(0...): " << segmentIndex
887 << " distBend: " << distBend
888 << " distNonBend: " << distNonBend
891 cout << "HitForRec in first chamber" << endl;
893 cout << "HitForRec in second chamber" << endl;
896 // increment index for current segment
900 } // for (Int_t hit1...
901 fNSegments[Station] = segmentIndex;
902 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
903 // i.e. Station(0..4) 3 or 4, using the function "Compare".
904 // After this sorting, it is impossible to use
905 // the "fNSegments" and "fIndexOfFirstSegment"
906 // of the HitForRec in the first chamber to explore all segments formed with it.
907 // Is this sorting really needed ????
908 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
909 AliDebug(1,Form("Station: %d NSegments: %d ", Station, fNSegments[Station]));
913 //__________________________________________________________________________
914 void AliMUONTrackReconstructor::MakeTracks(void)
916 // To make the tracks,
917 // from the list of segments and points in all stations
918 AliDebug(1,"Enter MakeTracks");
919 // The order may be important for the following Reset's
921 //AZ ResetTrackHits();
922 if (fTrackMethod != 1) { //AZ - Kalman filter
923 MakeTrackCandidatesK();
924 if (fRecTracksPtr->GetEntriesFast() == 0) return;
925 // Follow tracks in stations(1..) 3, 2 and 1
927 // Remove double tracks
928 RemoveDoubleTracksK();
929 // Propagate tracks to the vertex thru absorber
931 // Fill AliMUONTrack data members
934 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
935 MakeTrackCandidates();
936 // Follow tracks in stations(1..) 3, 2 and 1
938 // Remove double tracks
939 RemoveDoubleTracks();
940 UpdateTrackParamAtHit();
941 UpdateHitForRecAtHit();
946 //__________________________________________________________________________
947 void AliMUONTrackReconstructor::ValidateTracksWithTrigger(void)
949 // Try to match track from tracking system with trigger track
951 TClonesArray *recTriggerTracks;
953 fMUONData->SetTreeAddress("RL");
954 fMUONData->GetRecTriggerTracks();
955 recTriggerTracks = fMUONData->RecTriggerTracks();
957 track = (AliMUONTrack*) fRecTracksPtr->First();
959 track->MatchTriggerTrack(recTriggerTracks);
960 track = (AliMUONTrack*) fRecTracksPtr->After(track);
965 //__________________________________________________________________________
966 Bool_t AliMUONTrackReconstructor::MakeTriggerTracks(void)
968 // To make the trigger tracks from Local Trigger
969 AliDebug(1, "Enter MakeTriggerTracks");
973 TClonesArray *localTrigger;
974 TClonesArray *globalTrigger;
975 AliMUONLocalTrigger *locTrg;
976 AliMUONGlobalTrigger *gloTrg;
977 AliMUONTriggerCircuit *circuit;
978 AliMUONTriggerTrack *recTriggerTrack = 0;
980 TTree* treeR = fLoader->TreeR();
982 // Loading MUON subsystem
983 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
985 nTRentries = Int_t(treeR->GetEntries());
987 treeR->GetEvent(0); // only one entry
989 if (!(fMUONData->IsTriggerBranchesInTree())) {
990 AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries));
994 fMUONData->SetTreeAddress("TC");
995 fMUONData->GetTrigger();
997 // global trigger for trigger pattern
999 globalTrigger = fMUONData->GlobalTrigger();
1000 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1002 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1003 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1004 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1006 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1007 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1008 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1010 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1011 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1012 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1014 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1015 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1016 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1018 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1019 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1020 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1023 // local trigger for tracking
1024 localTrigger = fMUONData->LocalTrigger();
1025 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1027 Float_t z11 = AliMUONConstants::DefaultChamberZ(10);
1028 Float_t z21 = AliMUONConstants::DefaultChamberZ(12);
1030 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1031 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1032 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1033 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1034 Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
1035 Float_t y21 = circuit->GetY21Pos(stripX21);
1036 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1037 Float_t thetax = TMath::ATan2( x11 , z11 );
1038 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1040 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat);
1042 // since static statement does not work, set gloTrigPat for each track
1044 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
1045 delete recTriggerTrack;
1046 } // end of loop on Local Trigger
1050 //__________________________________________________________________________
1051 Int_t AliMUONTrackReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1053 // To make track candidates with two segments in stations(1..) 4 and 5,
1054 // the first segment being pointed to by "BegSegment".
1055 // Returns the number of such track candidates.
1056 Int_t endStation, iEndSegment, nbCan2Seg;
1057 AliMUONSegment *endSegment;
1058 AliMUONSegment *extrapSegment = NULL;
1059 AliMUONTrack *recTrack;
1061 AliDebug(1,"Enter MakeTrackCandidatesWithTwoSegments");
1062 // Station for the end segment
1063 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1064 // multiple scattering factor corresponding to one chamber
1065 mcsFactor = 0.0136 /
1066 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1067 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1068 // linear extrapolation to end station
1069 // number of candidates with 2 segments to 0
1071 // Loop over segments in the end station
1072 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1073 // pointer to segment
1074 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1075 // test compatibility between current segment and "extrapSegment"
1076 // 4 because 4 quantities in chi2
1078 BegSegment->CreateSegmentFromLinearExtrapToStation(endSegment->GetZ(), mcsFactor);
1080 NormalizedChi2WithSegment(extrapSegment,
1081 fMaxSigma2Distance)) <= 4.0) {
1082 // both segments compatible:
1083 // make track candidate from "begSegment" and "endSegment"
1084 AliDebug(2,Form("TrackCandidate with Segment %d in Station(0..) %d", iEndSegment, endStation));
1085 // flag for both segments in one track:
1086 // to be done in track constructor ????
1087 BegSegment->SetInTrack(kTRUE);
1088 endSegment->SetInTrack(kTRUE);
1089 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1090 AliMUONTrack(BegSegment, endSegment, this);
1092 if (AliLog::GetGlobalDebugLevel() > 1) recTrack->RecursiveDump();
1093 // increment number of track candidates with 2 segments
1096 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1097 } // for (iEndSegment = 0;...
1101 //__________________________________________________________________________
1102 Int_t AliMUONTrackReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1104 // To make track candidates with one segment and one point
1105 // in stations(1..) 4 and 5,
1106 // the segment being pointed to by "BegSegment".
1107 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1108 AliMUONHitForRec *extrapHitForRec= NULL;
1109 AliMUONHitForRec *hit;
1110 AliMUONTrack *recTrack;
1112 AliDebug(1,"Enter MakeTrackCandidatesWithOneSegmentAndOnePoint");
1113 // station for the end point
1114 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1115 // multiple scattering factor corresponding to one chamber
1116 mcsFactor = 0.0136 /
1117 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1118 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1119 // first and second chambers(0..) in the end station
1120 ch1 = 2 * endStation;
1122 // number of candidates to 0
1124 // Loop over chambers of the end station
1125 for (ch = ch2; ch >= ch1; ch--) {
1126 // limits for the hit index in the loop
1127 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1128 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1129 // Loop over HitForRec's in the chamber
1130 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1131 // pointer to HitForRec
1132 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1133 // test compatibility between current HitForRec and "extrapHitForRec"
1134 // 2 because 2 quantities in chi2
1135 // linear extrapolation to chamber
1137 BegSegment->CreateHitForRecFromLinearExtrapToChamber( hit->GetZ(), mcsFactor);
1139 NormalizedChi2WithHitForRec(extrapHitForRec,
1140 fMaxSigma2Distance)) <= 2.0) {
1141 // both HitForRec's compatible:
1142 // make track candidate from begSegment and current HitForRec
1143 AliDebug(2, Form("TrackCandidate with HitForRec %d in Chamber(0..) %d", iHit, ch));
1144 // flag for beginning segments in one track:
1145 // to be done in track constructor ????
1146 BegSegment->SetInTrack(kTRUE);
1147 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1148 AliMUONTrack(BegSegment, hit, this);
1149 // the right place to eliminate "double counting" ???? how ????
1151 if (AliLog::GetGlobalDebugLevel() > 1) recTrack->RecursiveDump();
1152 // increment number of track candidates
1155 delete extrapHitForRec;
1156 } // for (iHit = iHitMin;...
1157 } // for (ch = ch2;...
1158 return nbCan1Seg1Hit;
1161 //__________________________________________________________________________
1162 void AliMUONTrackReconstructor::MakeTrackCandidates(void)
1164 // To make track candidates
1165 // with at least 3 aligned points in stations(1..) 4 and 5
1166 // (two Segment's or one Segment and one HitForRec)
1167 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1168 AliMUONSegment *begSegment;
1169 AliDebug(1,"Enter MakeTrackCandidates");
1170 // Loop over stations(1..) 5 and 4 for the beginning segment
1171 for (begStation = 4; begStation > 2; begStation--) {
1172 // Loop over segments in the beginning station
1173 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1174 // pointer to segment
1175 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1176 AliDebug(2,Form("Look for TrackCandidate's with Segment %d in Station(0..) %d", iBegSegment, begStation));
1177 // Look for track candidates with two segments,
1178 // "begSegment" and all compatible segments in other station.
1179 // Only for beginning station(1..) 5
1180 // because candidates with 2 segments have to looked for only once.
1181 if (begStation == 4)
1182 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1183 // Look for track candidates with one segment and one point,
1184 // "begSegment" and all compatible HitForRec's in other station.
1185 // Only if "begSegment" does not belong already to a track candidate.
1186 // Is that a too strong condition ????
1187 if (!(begSegment->GetInTrack()))
1188 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1189 } // for (iBegSegment = 0;...
1190 } // for (begStation = 4;...
1194 //__________________________________________________________________________
1195 void AliMUONTrackReconstructor::FollowTracks(void)
1197 // Follow tracks in stations(1..) 3, 2 and 1
1198 // too long: should be made more modular !!!!
1199 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1200 AliMUONSegment *bestSegment, *extrapSegment, *segment;
1201 AliMUONTrack *track, *nextTrack;
1202 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1203 // -1 to avoid compilation warnings
1204 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1205 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1206 Double_t bendingMomentum, chi2Norm = 0.;
1208 // local maxSigma2Distance, for easy increase in testing
1209 maxSigma2Distance = fMaxSigma2Distance;
1210 AliDebug(2,"Enter FollowTracks");
1211 // Loop over track candidates
1212 track = (AliMUONTrack*) fRecTracksPtr->First();
1215 // Follow function for each track candidate ????
1217 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1218 AliDebug(2,Form("FollowTracks: track candidate(0..): %d", trackIndex));
1219 // Fit track candidate
1220 track->SetFitMCS(0); // without multiple Coulomb scattering
1221 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1222 track->SetFitStart(0); // from parameters at vertex
1224 if (AliLog::GetGlobalDebugLevel()> 2) {
1225 cout << "FollowTracks: track candidate(0..): " << trackIndex
1226 << " after fit in stations(0..) 3 and 4" << endl;
1227 track->RecursiveDump();
1229 // Loop over stations(1..) 3, 2 and 1
1230 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1231 // otherwise: majority coincidence 2 !!!!
1232 for (station = 2; station >= 0; station--) {
1233 // Track parameters at first track hit (smallest Z)
1234 trackParam1 = ((AliMUONTrackHit*)
1235 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1236 // extrapolation to station
1237 trackParam1->ExtrapToStation(station, trackParam);
1238 extrapSegment = new AliMUONSegment(); // empty segment
1239 // multiple scattering factor corresponding to one chamber
1240 // and momentum in bending plane (not total)
1241 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1242 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1243 // Z difference from previous station
1244 dZ1 = AliMUONConstants::DefaultChamberZ(2 * station) -
1245 AliMUONConstants::DefaultChamberZ(2 * station + 2);
1246 // Z difference between the two previous stations
1247 dZ2 = AliMUONConstants::DefaultChamberZ(2 * station + 2) -
1248 AliMUONConstants::DefaultChamberZ(2 * station + 4);
1249 // Z difference between the two chambers in the previous station
1250 dZ3 = AliMUONConstants::DefaultChamberZ(2 * station) -
1251 AliMUONConstants::DefaultChamberZ(2 * station + 1);
1252 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1254 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1255 extrapSegment->UpdateFromStationTrackParam
1256 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1257 trackParam1->GetInverseBendingMomentum());
1260 if (AliLog::GetGlobalDebugLevel() > 2) {
1261 cout << "FollowTracks: track candidate(0..): " << trackIndex
1262 << " Look for segment in station(0..): " << station << endl;
1264 // Loop over segments in station
1265 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1266 // Look for best compatible Segment in station
1267 // should consider all possibilities ????
1268 // multiple scattering ????
1269 // separation in 2 functions: Segment and HitForRec ????
1270 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1271 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1272 // according to real Z value of "segment" and slopes of "extrapSegment"
1273 (&(trackParam[0]))->ExtrapToZ(segment->GetZ());
1274 (&(trackParam[1]))->ExtrapToZ(segment->GetZ());
1275 extrapSegment->SetBendingCoor((&(trackParam[0]))->GetBendingCoor());
1276 extrapSegment->SetNonBendingCoor((&(trackParam[0]))->GetNonBendingCoor());
1277 extrapSegment->SetBendingSlope((&(trackParam[0]))->GetBendingSlope());
1278 extrapSegment->SetNonBendingSlope((&(trackParam[0]))->GetNonBendingSlope());
1280 NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1281 if (chi2 < bestChi2) {
1282 // update best Chi2 and Segment if better found
1283 bestSegment = segment;
1288 // best segment found: add it to track candidate
1289 (&(trackParam[0]))->ExtrapToZ(bestSegment->GetZ());
1290 (&(trackParam[1]))->ExtrapToZ(bestSegment->GetZ());
1291 track->AddSegment(bestSegment);
1292 // set track parameters at these two TrakHit's
1293 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1294 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1295 AliDebug(3, Form("FollowTracks: track candidate(0..): %d Added segment in station(0..): %d", trackIndex, station));
1296 if (AliLog::GetGlobalDebugLevel()>2) track->RecursiveDump();
1299 // No best segment found:
1300 // Look for best compatible HitForRec in station:
1301 // should consider all possibilities ????
1302 // multiple scattering ???? do about like for extrapSegment !!!!
1303 extrapHit = new AliMUONHitForRec(); // empty hit
1306 AliDebug(3, Form("FollowTracks: track candidate(0..): %d Segment not found, look for hit in station(0..): %d ",
1307 trackIndex, station));
1309 // Loop over chambers of the station
1310 for (chInStation = 0; chInStation < 2; chInStation++) {
1311 ch = 2 * station + chInStation;
1312 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1313 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1314 fNHitsForRecPerChamber[ch];
1316 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1317 // coordinates of extrapolated hit
1318 (&(trackParam[chInStation]))->ExtrapToZ(hit->GetZ());
1320 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1322 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1323 // resolutions from "extrapSegment"
1324 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1325 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1326 // Loop over hits in the chamber
1327 // condition for hit not already in segment ????
1328 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1329 if (chi2 < bestChi2) {
1330 // update best Chi2 and HitForRec if better found
1333 chBestHit = chInStation;
1338 // best hit found: add it to track candidate
1339 (&(trackParam[chBestHit]))->ExtrapToZ(bestHit->GetZ());
1340 track->AddHitForRec(bestHit);
1341 // set track parameters at this TrackHit
1342 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1343 &(trackParam[chBestHit]));
1344 if (AliLog::GetGlobalDebugLevel() > 2) {
1345 cout << "FollowTracks: track candidate(0..): " << trackIndex
1346 << " Added hit in station(0..): " << station << endl;
1347 track->RecursiveDump();
1351 // Remove current track candidate
1352 // and corresponding TrackHit's, ...
1354 delete extrapSegment;
1356 break; // stop the search for this candidate:
1357 // exit from the loop over station
1361 delete extrapSegment;
1362 // Sort track hits according to increasing Z
1363 track->GetTrackHitsPtr()->Sort();
1364 // Update track parameters at first track hit (smallest Z)
1365 trackParam1 = ((AliMUONTrackHit*)
1366 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1367 bendingMomentum = 0.;
1368 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1369 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1370 // Track removed if bendingMomentum not in window [min, max]
1371 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1373 break; // stop the search for this candidate:
1374 // exit from the loop over station
1377 // with multiple Coulomb scattering if all stations
1378 if (station == 0) track->SetFitMCS(1);
1379 // without multiple Coulomb scattering if not all stations
1380 else track->SetFitMCS(0);
1381 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1382 track->SetFitStart(1); // from parameters at first hit
1384 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1385 if (numberOfDegFree > 0) {
1386 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1390 // Track removed if normalized chi2 too high
1391 if (chi2Norm > fMaxChi2) {
1393 break; // stop the search for this candidate:
1394 // exit from the loop over station
1396 if (AliLog::GetGlobalDebugLevel() > 2) {
1397 cout << "FollowTracks: track candidate(0..): " << trackIndex
1398 << " after fit from station(0..): " << station << " to 4" << endl;
1399 track->RecursiveDump();
1401 // Track extrapolation to the vertex through the absorber (Branson)
1402 // after going through the first station
1404 trackParamVertex = *trackParam1;
1405 (&trackParamVertex)->ExtrapToVertex(0.,0.,0.);
1406 track->SetTrackParamAtVertex(&trackParamVertex);
1407 if (AliLog::GetGlobalDebugLevel() > 0) {
1408 cout << "FollowTracks: track candidate(0..): " << trackIndex
1409 << " after extrapolation to vertex" << endl;
1410 track->RecursiveDump();
1413 } // for (station = 2;...
1414 // go really to next track
1417 // Compression of track array (necessary after Remove ????)
1418 fRecTracksPtr->Compress();
1422 //__________________________________________________________________________
1423 void AliMUONTrackReconstructor::RemoveDoubleTracks(void)
1425 // To remove double tracks.
1426 // Tracks are considered identical
1427 // if they have at least half of their hits in common.
1428 // Among two identical tracks, one keeps the track with the larger number of hits
1429 // or, if these numbers are equal, the track with the minimum Chi2.
1430 AliMUONTrack *track1, *track2, *trackToRemove;
1431 Bool_t identicalTracks;
1432 Int_t hitsInCommon, nHits1, nHits2;
1433 identicalTracks = kTRUE;
1434 while (identicalTracks) {
1435 identicalTracks = kFALSE;
1436 // Loop over first track of the pair
1437 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1438 while (track1 && (!identicalTracks)) {
1439 nHits1 = track1->GetNTrackHits();
1440 // Loop over second track of the pair
1441 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1442 while (track2 && (!identicalTracks)) {
1443 nHits2 = track2->GetNTrackHits();
1444 // number of hits in common between two tracks
1445 hitsInCommon = track1->HitsInCommon(track2);
1446 // check for identical tracks
1447 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1448 identicalTracks = kTRUE;
1449 // decide which track to remove
1450 if (nHits1 > nHits2) trackToRemove = track2;
1451 else if (nHits1 < nHits2) trackToRemove = track1;
1452 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1453 trackToRemove = track2;
1454 else trackToRemove = track1;
1456 trackToRemove->Remove();
1458 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1460 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1466 //__________________________________________________________________________
1467 void AliMUONTrackReconstructor::UpdateTrackParamAtHit()
1469 // Set track parameters after track fitting. Fill fTrackParamAtHit of AliMUONTrack's
1470 AliMUONTrack *track;
1471 AliMUONTrackHit *trackHit;
1472 AliMUONTrackParam *trackParam;
1473 track = (AliMUONTrack*) fRecTracksPtr->First();
1475 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1477 trackParam = trackHit->GetTrackParam();
1478 track->AddTrackParamAtHit(trackParam);
1479 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1481 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1486 //__________________________________________________________________________
1487 void AliMUONTrackReconstructor::UpdateHitForRecAtHit()
1489 // Set cluster parameterss after track fitting. Fill fHitForRecAtHit of AliMUONTrack's
1490 AliMUONTrack *track;
1491 AliMUONTrackHit *trackHit;
1492 AliMUONHitForRec *hitForRec;
1493 track = (AliMUONTrack*) fRecTracksPtr->First();
1495 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1497 hitForRec = trackHit->GetHitForRecPtr();
1498 track->AddHitForRecAtHit(hitForRec);
1499 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1501 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1506 //__________________________________________________________________________
1507 void AliMUONTrackReconstructor::FillMUONTrack()
1509 // Set track parameters at hits for Kalman track. Fill fTrackParamAtHit of AliMUONTrack's
1510 AliMUONTrackK *track;
1511 track = (AliMUONTrackK*) fRecTracksPtr->First();
1513 track->FillMUONTrack();
1514 track = (AliMUONTrackK*) fRecTracksPtr->After(track);
1519 //__________________________________________________________________________
1520 void AliMUONTrackReconstructor::EventDump(void)
1522 // Dump reconstructed event (track parameters at vertex and at first hit),
1523 // and the particle parameters
1525 AliMUONTrack *track;
1526 AliMUONTrackParam *trackParam, *trackParam1;
1527 Double_t bendingSlope, nonBendingSlope, pYZ;
1528 Double_t pX, pY, pZ, x, y, z, c;
1529 Int_t np, trackIndex, nTrackHits;
1531 AliDebug(1,"****** enter EventDump ******");
1532 AliDebug(1, Form("Number of Reconstructed tracks : %d", fNRecTracks));
1534 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1535 // Loop over reconstructed tracks
1536 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1537 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1538 AliDebug(1, Form("track number: %d", trackIndex));
1539 // function for each track for modularity ????
1540 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1541 nTrackHits = track->GetNTrackHits();
1542 AliDebug(1, Form("Number of track hits: %d ", nTrackHits));
1543 // track parameters at Vertex
1544 trackParam = track->GetTrackParamAtVertex();
1545 x = trackParam->GetNonBendingCoor();
1546 y = trackParam->GetBendingCoor();
1547 z = trackParam->GetZ();
1548 bendingSlope = trackParam->GetBendingSlope();
1549 nonBendingSlope = trackParam->GetNonBendingSlope();
1550 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1551 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1552 pX = pZ * nonBendingSlope;
1553 pY = pZ * bendingSlope;
1554 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1555 AliDebug(1, Form("Track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1556 z, x, y, pX, pY, pZ, c));
1558 // track parameters at first hit
1559 trackParam1 = ((AliMUONTrackHit*)
1560 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1561 x = trackParam1->GetNonBendingCoor();
1562 y = trackParam1->GetBendingCoor();
1563 z = trackParam1->GetZ();
1564 bendingSlope = trackParam1->GetBendingSlope();
1565 nonBendingSlope = trackParam1->GetNonBendingSlope();
1566 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1567 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1568 pX = pZ * nonBendingSlope;
1569 pY = pZ * bendingSlope;
1570 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1571 AliDebug(1, Form("track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1572 z, x, y, pX, pY, pZ, c));
1574 // informations about generated particles
1575 np = gAlice->GetMCApp()->GetNtrack();
1576 printf(" **** number of generated particles: %d \n", np);
1578 // for (Int_t iPart = 0; iPart < np; iPart++) {
1579 // p = gAlice->Particle(iPart);
1580 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1581 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1587 //__________________________________________________________________________
1588 void AliMUONTrackReconstructor::EventDumpTrigger(void)
1590 // Dump reconstructed trigger event
1591 // and the particle parameters
1593 AliMUONTriggerTrack *triggertrack ;
1594 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
1596 AliDebug(1, "****** enter EventDumpTrigger ******");
1597 AliDebug(1, Form("Number of Reconstructed tracks : %d ", nTriggerTracks));
1599 // Loop over reconstructed tracks
1600 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1601 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
1602 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1604 triggertrack->GetX11(),triggertrack->GetY11(),
1605 triggertrack->GetThetax(),triggertrack->GetThetay());
1609 //__________________________________________________________________________
1610 void AliMUONTrackReconstructor::MakeTrackCandidatesK(void)
1612 // To make initial tracks for Kalman filter from the list of segments
1614 AliMUONSegment *segment;
1615 AliMUONTrackK *trackK;
1617 AliDebug(1,"Enter MakeTrackCandidatesK");
1619 AliMUONTrackK a(this, fHitsForRecPtr);
1620 // Loop over stations(1...) 5 and 4
1621 for (istat=4; istat>=3; istat--) {
1622 // Loop over segments in the station
1623 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1624 // Transform segments to tracks and evaluate covariance matrix
1625 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1626 trackK = new ((*fRecTracksPtr)[fNRecTracks++]) AliMUONTrackK(segment);
1627 } // for (iseg=0;...)
1628 } // for (istat=4;...)
1632 //__________________________________________________________________________
1633 void AliMUONTrackReconstructor::FollowTracksK(void)
1635 // Follow tracks using Kalman filter
1637 Int_t icand, ichamBeg = 0, ichamEnd, chamBits;
1638 Double_t zDipole1, zDipole2;
1639 AliMUONTrackK *trackK;
1640 AliMUONHitForRec *hit;
1641 AliMUONRawCluster *clus;
1642 TClonesArray *rawclusters;
1643 clus = 0; rawclusters = 0;
1645 zDipole1 = GetSimpleBPosition() + GetSimpleBLength()/2;
1646 zDipole2 = zDipole1 - GetSimpleBLength();
1649 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[0]);
1650 if (trackK->DebugLevel() > 0) {
1651 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1652 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1653 //if (hit->GetTTRTrack() > 1 || hit->GetTrackRefSignal() == 0) continue;
1654 printf(" Hit # %d %10.4f %10.4f %10.4f",
1655 hit->GetChamberNumber(), hit->GetBendingCoor(),
1656 hit->GetNonBendingCoor(), hit->GetZ());
1657 if (fRecTrackRefHits) {
1658 // from track ref hits
1659 printf(" %3d %3d \n", hit->GetTrackRefSignal(), hit->GetTTRTrack());
1661 // from raw clusters
1662 rawclusters = fMUONData->RawClusters(hit->GetChamberNumber());
1663 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1665 printf(" %d", clus->GetTrack(1));
1666 if (clus->GetTrack(2) != -1) printf(" %d \n", clus->GetTrack(2));
1668 } // if (fRecTrackRefHits)
1670 } // if (trackK->DebugLevel() > 0)
1674 nSeeds = fNRecTracks; // starting number of seeds
1675 // Loop over track candidates
1676 while (icand < fNRecTracks-1) {
1678 if (trackK->DebugLevel()>0) cout << " *** Kalman track candidate No. " << icand << endl;
1679 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1680 if (trackK->GetRecover() < 0) continue; // failed track
1682 // Discard candidate which will produce the double track
1685 ok = CheckCandidateK(icand,nSeeds);
1687 trackK->SetRecover(-1); // mark candidate to be removed
1694 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1695 trackK->GetTrackHits()->Last(); // last hit
1696 else hit = trackK->GetHitLastOk(); // hit where track stopped
1697 if (hit) ichamBeg = hit->GetChamberNumber();
1699 // Check propagation direction
1700 if (!hit) { ichamBeg = ichamEnd; AliFatal(" ??? "); }
1701 else if (trackK->GetTrackDir() < 0) {
1702 ichamEnd = 9; // forward propagation
1703 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1705 ichamBeg = ichamEnd;
1706 ichamEnd = 6; // backward propagation
1707 // Change weight matrix and zero fChi2 for backpropagation
1708 trackK->StartBack();
1709 trackK->SetTrackDir(1);
1710 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1711 ichamBeg = ichamEnd;
1715 if (trackK->GetBPFlag()) {
1717 ichamEnd = 6; // backward propagation
1718 // Change weight matrix and zero fChi2 for backpropagation
1719 trackK->StartBack();
1720 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1721 ichamBeg = ichamEnd;
1727 trackK->SetTrackDir(1);
1728 trackK->SetBPFlag(kFALSE);
1729 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1731 if (!ok) { trackK->SetRecover(-1); continue; } // mark candidate to be removed
1734 if (trackK->GetRecover() >= 0) {
1735 ok = trackK->Smooth();
1736 if (!ok) trackK->SetRecover(-1); // mark candidate to be removed
1739 // Majority 3 of 4 in first 2 stations
1742 Double_t chi2max = 0;
1743 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1744 hit = (AliMUONHitForRec*) (*trackK->GetTrackHits())[i];
1745 chamBits |= BIT(hit->GetChamberNumber());
1746 if (trackK->GetChi2PerPoint(i) > chi2max) chi2max = trackK->GetChi2PerPoint(i);
1748 if (!((chamBits&3)==3 || (chamBits>>2&3)==3) && chi2max > 25) {
1749 //trackK->Recover();
1750 trackK->SetRecover(-1); //mark candidate to be removed
1753 if (ok) trackK->SetTrackQuality(0); // compute "track quality"
1756 for (Int_t i=0; i<fNRecTracks; i++) {
1757 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1758 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1761 // Compress TClonesArray
1762 fRecTracksPtr->Compress();
1763 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1767 //__________________________________________________________________________
1768 Bool_t AliMUONTrackReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds) const
1770 // Discards track candidate if it will produce the double track (having
1771 // the same seed segment hits as hits of a good track found before)
1772 AliMUONTrackK *track1, *track2;
1773 AliMUONHitForRec *hit1, *hit2, *hit;
1775 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1776 hit1 = (AliMUONHitForRec*) (*track1->GetTrackHits())[0]; // 1'st hit
1777 hit2 = (AliMUONHitForRec*) (*track1->GetTrackHits())[1]; // 2'nd hit
1779 for (Int_t i=0; i<icand; i++) {
1780 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1781 //if (track2->GetRecover() < 0) continue;
1782 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1784 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1788 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1789 hit = (AliMUONHitForRec*) (*track2->GetTrackHits())[j];
1790 if (hit == hit1 || hit == hit2) {
1792 if (nSame == 2) return kFALSE;
1794 } // for (Int_t j=0;
1796 } // for (Int_t i=0;
1800 //__________________________________________________________________________
1801 void AliMUONTrackReconstructor::RemoveDoubleTracksK(void)
1803 // Removes double tracks (sharing more than half of their hits). Keeps
1804 // the track with higher quality
1805 AliMUONTrackK *track1, *track2, *trackToKill;
1807 // Sort tracks according to their quality
1808 fRecTracksPtr->Sort();
1810 // Loop over first track of the pair
1811 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1812 Int_t debug = track1->DebugLevel();
1814 // Loop over second track of the pair
1815 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1817 // Check whether or not to keep track2
1818 if (!track2->KeepTrack(track1)) {
1819 if (debug >= 0) cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1820 " " << track2->GetTrackQuality() << endl;
1821 trackToKill = track2;
1822 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1823 trackToKill->Kill();
1824 fRecTracksPtr->Compress();
1825 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1827 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1830 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1831 if (debug >= 0) cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1834 //__________________________________________________________________________
1835 void AliMUONTrackReconstructor::GoToVertex(void)
1837 // Propagates track to the vertex thru absorber
1838 // (using Branson correction for now)
1842 for (Int_t i=0; i<fNRecTracks; i++) {
1843 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1844 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1845 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1846 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(1); // with absorber
1850 //__________________________________________________________________________
1851 void AliMUONTrackReconstructor::SetTrackMethod(Int_t iTrackMethod)
1853 // Set track method and recreate track container if necessary
1855 fTrackMethod = TMath::Min (iTrackMethod, 3);
1856 fTrackMethod = TMath::Max (fTrackMethod, 1);
1857 if (fTrackMethod != 1) {
1858 if (fRecTracksPtr) delete fRecTracksPtr;
1859 fRecTracksPtr = new TClonesArray("AliMUONTrackK", 10);
1860 if (fTrackMethod == 2) cout << " *** Tracking with the Kalman filter *** " << endl;
1861 else cout << " *** Combined cluster / track finder ***" << endl;
1862 } else cout << " *** Original tracking *** " << endl;