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 event reconstructor in ALICE
22 // This class contains as data:
23 // * the parameters for the event 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 ////////////////////////////////////
35 #include <Riostream.h> // for cout
36 #include <stdlib.h> // for exit()
41 #include "AliMUONChamber.h"
42 #include "AliMUONEventReconstructor.h"
43 #include "AliMUONHitForRec.h"
44 #include "AliMUONRawCluster.h"
45 #include "AliMUONRecoEvent.h"
46 #include "AliMUONSegment.h"
47 #include "AliMUONTrack.h"
48 #include "AliMUONTrackHit.h"
50 #include "AliRun.h" // for gAlice
51 #include "AliConfig.h"
52 #include "AliRunLoader.h"
53 #include "AliLoader.h"
54 #include "AliMUONTrackK.h" //AZ
55 #include <TMatrixD.h> //AZ
57 //************* Defaults parameters for reconstruction
58 static const Double_t kDefaultMinBendingMomentum = 3.0;
59 static const Double_t kDefaultMaxBendingMomentum = 500.0;
60 static const Double_t kDefaultMaxChi2 = 100.0;
61 static const Double_t kDefaultMaxSigma2Distance = 16.0;
62 static const Double_t kDefaultBendingResolution = 0.01;
63 static const Double_t kDefaultNonBendingResolution = 0.144;
64 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
65 // Simple magnetic field:
66 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
67 // Length and Position from reco_muon.F, with opposite sign:
68 // Length = ZMAGEND-ZCOIL
69 // Position = (ZMAGEND+ZCOIL)/2
70 // to be ajusted differently from real magnetic field ????
71 static const Double_t kDefaultSimpleBValue = 7.0;
72 static const Double_t kDefaultSimpleBLength = 428.0;
73 static const Double_t kDefaultSimpleBPosition = 1019.0;
74 static const Int_t kDefaultRecGeantHits = 0;
75 static const Double_t kDefaultEfficiency = 0.95;
77 static const Int_t kDefaultPrintLevel = 0;
79 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
81 //__________________________________________________________________________
82 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
84 // Constructor for class AliMUONEventReconstructor
85 SetReconstructionParametersToDefaults();
86 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
87 // Memory allocation for the TClonesArray of hits for reconstruction
88 // Is 10000 the right size ????
89 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
90 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
91 // Memory allocation for the TClonesArray's of segments in stations
92 // Is 2000 the right size ????
93 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
94 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
95 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
97 // Memory allocation for the TClonesArray of reconstructed tracks
98 // Is 10 the right size ????
99 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
100 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
101 // Memory allocation for the TClonesArray of hits on reconstructed tracks
102 // Is 100 the right size ????
103 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
104 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
106 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
108 x[0] = 50.; x[1] = 50.; x[2] = 950.;
109 gAlice->Field()->Field(x, b);
110 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
111 // See how to get fSimple(BValue, BLength, BPosition)
112 // automatically calculated from the actual magnetic field ????
114 if (fPrintLevel >= 0) {
115 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
116 cout << endl << "Magnetic field from root file:" << endl;
117 gAlice->Field()->Dump();
121 // Initializions for GEANT background events
124 fBkgGeantParticles = 0;
127 fBkgGeantEventNumber = -1;
129 // Initialize to 0 pointers to RecoEvent, tree and tree file
137 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
139 // Dummy copy constructor
142 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
144 // Dummy assignment operator
148 //__________________________________________________________________________
149 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
151 // Destructor for class AliMUONEventReconstructor
156 // if (fEventTree) delete fEventTree;
157 if (fRecoEvent) delete fRecoEvent;
158 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
159 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
160 delete fSegmentsPtr[st]; // Correct destruction of everything ????
164 //__________________________________________________________________________
165 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
167 // Set reconstruction parameters to default values
168 // Would be much more convenient with a structure (or class) ????
169 fMinBendingMomentum = kDefaultMinBendingMomentum;
170 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
171 fMaxChi2 = kDefaultMaxChi2;
172 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
174 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
175 // ******** Parameters for making HitsForRec
177 // like in TRACKF_STAT:
178 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
179 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
180 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
181 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
182 2.0 * TMath::Pi() / 180.0;
183 else fRMin[ch] = 30.0;
184 // maximum radius at 10 degrees and Z of chamber
185 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
186 10.0 * TMath::Pi() / 180.0;
189 // ******** Parameters for making segments
190 // should be parametrized ????
191 // according to interval between chambers in a station ????
192 // Maximum distance in non bending plane
193 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
195 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
196 fSegmentMaxDistNonBending[st] = 5. * 0.22;
197 // Maximum distance in bending plane:
198 // values from TRACKF_STAT, corresponding to (J psi 20cm),
199 // scaled to the real distance between chambers in a station
200 fSegmentMaxDistBending[0] = 1.5 *
201 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
202 fSegmentMaxDistBending[1] = 1.5 *
203 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
204 fSegmentMaxDistBending[2] = 3.0 *
205 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
206 fSegmentMaxDistBending[3] = 6.0 *
207 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
208 fSegmentMaxDistBending[4] = 6.0 *
209 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
211 fBendingResolution = kDefaultBendingResolution;
212 fNonBendingResolution = kDefaultNonBendingResolution;
213 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
214 fSimpleBValue = kDefaultSimpleBValue;
215 fSimpleBLength = kDefaultSimpleBLength;
216 fSimpleBPosition = kDefaultSimpleBPosition;
217 fRecGeantHits = kDefaultRecGeantHits;
218 fEfficiency = kDefaultEfficiency;
219 fPrintLevel = kDefaultPrintLevel;
223 //__________________________________________________________________________
224 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
226 // Returns impact parameter at vertex in bending plane (cm),
227 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
228 // using simple values for dipole magnetic field.
229 // The sign of "BendingMomentum" is the sign of the charge.
230 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
234 //__________________________________________________________________________
235 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
237 // Returns signed bending momentum in bending plane (GeV/c),
238 // the sign being the sign of the charge for particles moving forward in Z,
239 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
240 // using simple values for dipole magnetic field.
241 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
245 //__________________________________________________________________________
246 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
248 // Set background file ... for GEANT hits
249 // Must be called after having loaded the firts signal event
250 if (fPrintLevel >= 0) {
251 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
252 << BkgGeantFileName << "''" << endl;}
253 if (strlen(BkgGeantFileName)) {
254 // BkgGeantFileName not empty: try to open the file
255 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
256 fBkgGeantFile = new TFile(BkgGeantFileName);
257 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
258 if (fBkgGeantFile-> IsOpen()) {
259 if (fPrintLevel >= 0) {
260 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
261 << "'' successfully opened" << endl;}
264 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
265 cout << "NOT FOUND: EXIT" << endl;
266 exit(0); // right instruction for exit ????
268 // Arrays for "particles" and "hits"
269 fBkgGeantParticles = new TClonesArray("TParticle", 200);
270 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
271 // Event number to -1 for initialization
272 fBkgGeantEventNumber = -1;
273 // Back to the signal file:
274 // first signal event must have been loaded previously,
275 // otherwise, Segmentation violation at the next instruction
276 // How is it possible to do smething better ????
277 ((gAlice->TreeK())->GetCurrentFile())->cd();
278 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
283 //__________________________________________________________________________
284 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
286 // Get next event in background file for GEANT hits
287 // Goes back to event number 0 when end of file is reached
290 if (fPrintLevel >= 0) {
291 cout << "Enter NextBkgGeantEvent" << endl;}
292 // Clean previous event
293 if(fBkgGeantTK) delete fBkgGeantTK;
295 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
296 if(fBkgGeantTH) delete fBkgGeantTH;
298 if(fBkgGeantHits) fBkgGeantHits->Clear();
299 // Increment event number
300 fBkgGeantEventNumber++;
301 // Get access to Particles and Hits for event from background file
302 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
304 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
305 // Particles: TreeK for event and branch "Particles"
306 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
307 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
309 if (fPrintLevel >= 0) {
310 cout << "Cannot find Kine Tree for background event: " <<
311 fBkgGeantEventNumber << endl;
312 cout << "Goes back to event 0" << endl;
314 fBkgGeantEventNumber = 0;
315 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
316 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
318 cout << "ERROR: cannot find Kine Tree for background event: " <<
319 fBkgGeantEventNumber << endl;
324 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
325 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
326 // Hits: TreeH for event and branch "MUON"
327 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
328 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
330 cout << "ERROR: cannot find Hits Tree for background event: " <<
331 fBkgGeantEventNumber << endl;
334 if (fBkgGeantTH && fBkgGeantHits) {
335 branch = fBkgGeantTH->GetBranch("MUON");
336 if (branch) branch->SetAddress(&fBkgGeantHits);
338 fBkgGeantTH->GetEntries(); // necessary ????
339 // Back to the signal file
340 ((gAlice->TreeK())->GetCurrentFile())->cd();
341 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
345 //__________________________________________________________________________
346 void AliMUONEventReconstructor::EventReconstruct(void)
348 // To reconstruct one event
349 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
350 MakeEventToBeReconstructed();
356 //__________________________________________________________________________
357 void AliMUONEventReconstructor::ResetHitsForRec(void)
359 // To reset the array and the number of HitsForRec,
360 // and also the number of HitsForRec
361 // and the index of the first HitForRec per chamber
362 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
364 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
365 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
369 //__________________________________________________________________________
370 void AliMUONEventReconstructor::ResetSegments(void)
372 // To reset the TClonesArray of segments and the number of Segments
374 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
375 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
381 //__________________________________________________________________________
382 void AliMUONEventReconstructor::ResetTracks(void)
384 // To reset the TClonesArray of reconstructed tracks
385 if (fRecTracksPtr) fRecTracksPtr->Delete();
386 // Delete in order that the Track destructors are called,
387 // hence the space for the TClonesArray of pointers to TrackHit's is freed
392 //__________________________________________________________________________
393 void AliMUONEventReconstructor::ResetTrackHits(void)
395 // To reset the TClonesArray of hits on reconstructed tracks
396 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
401 //__________________________________________________________________________
402 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
404 // To make the list of hits to be reconstructed,
405 // either from the GEANT hits or from the raw clusters
406 // according to the parameter set for the reconstructor
407 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
409 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
412 Error("MakeEventToBeReconstructed",
413 "Can not find Run Loader in Event Folder named %s.",
417 AliLoader* gime = rl->GetLoader("MUONLoader");
420 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
424 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
426 if (fRecGeantHits == 1) {
427 // Reconstruction from GEANT hits
428 // Back to the signal file
429 TTree* treeH = gime->TreeH();
432 Int_t retval = gime->LoadHits();
435 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
438 treeH = gime->TreeH();
441 Error("MakeEventToBeReconstructed","Can not get TreeH");
446 AddHitsForRecFromGEANT(treeH);
449 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
450 // Sort HitsForRec in increasing order with respect to chamber number
451 SortHitsForRecWithIncreasingChamber();
454 // Reconstruction from raw clusters
455 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
456 // Security on MUON ????
457 // TreeR assumed to be be "prepared" in calling function
458 // by "MUON->GetTreeR(nev)" ????
459 TTree *treeR = gime->TreeR();
460 AddHitsForRecFromRawClusters(treeR);
461 // No sorting: it is done automatically in the previous function
463 if (fPrintLevel >= 10) {
464 cout << "end of MakeEventToBeReconstructed" << endl;
465 cout << "NHitsForRec: " << fNHitsForRec << endl;
466 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
467 cout << "chamber(0...): " << ch
468 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
469 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
471 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
472 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
474 cout << "HitForRec index(0...): " << hit << endl;
475 ((*fHitsForRecPtr)[hit])->Dump();
482 //__________________________________________________________________________
483 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
485 // To add to the list of hits for reconstruction
486 // the GEANT signal hits from a hit tree TH.
487 Int_t hitBits, chamBits; //AZ
488 if (fPrintLevel >= 2)
489 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
490 if (TH == NULL) return;
491 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
492 // Security on MUON ????
493 // See whether it could be the same for signal and background ????
494 // Loop over tracks in tree
495 Int_t ntracks = (Int_t) TH->GetEntries();
496 if (fPrintLevel >= 2)
497 cout << "ntracks: " << ntracks << endl;
499 for (Int_t track = 0; track < ntracks; track++) {
506 Int_t itrack = track; //AZ
507 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
509 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
510 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
511 //itrack = mHit->Track(); //AZ
512 //AZNewHitForRecFromGEANT(mHit,track, hit, 1);
513 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
514 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
515 && itrack <= 2) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
517 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
518 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
520 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
521 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
522 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
523 } // end of track loop
527 //__________________________________________________________________________
528 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
530 // To add to the list of hits for reconstruction
531 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
532 // How to have only one function "AddHitsForRecFromGEANT" ????
533 if (fPrintLevel >= 2)
534 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
535 if (TH == NULL) return;
536 // Loop over tracks in tree
537 Int_t ntracks = (Int_t) TH->GetEntries();
538 if (fPrintLevel >= 2)
539 cout << "ntracks: " << ntracks << endl;
540 for (Int_t track = 0; track < ntracks; track++) {
541 if (Hits) Hits->Clear();
544 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
545 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
547 } // end of track loop
551 //__________________________________________________________________________
552 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
554 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
555 // with hit number "HitNumber" in the track numbered "TrackNumber",
556 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
557 // Selects hits in tracking (not trigger) chambers.
558 // Takes into account the efficiency (fEfficiency)
559 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
560 // Adds a condition on the radius between RMin and RMax
561 // to better simulate the real chambers.
562 // Returns the pointer to the new hit for reconstruction,
563 // or NULL in case of inefficiency or non tracking chamber or bad radius.
564 // No condition on at most 20 cm from a muon from a resonance
565 // like in Fortran TRACKF_STAT.
566 AliMUONHitForRec* hitForRec;
567 Double_t bendCoor, nonBendCoor, radius;
568 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
569 // only in tracking chambers (fChamber starts at 1)
570 if (chamber >= kMaxMuonTrackingChambers) return NULL;
571 // only if hit is efficient (keep track for checking ????)
572 if (gRandom->Rndm() > fEfficiency) return NULL;
573 // only if radius between RMin and RMax
575 nonBendCoor = Hit->X();
576 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
577 // This cut is not needed with a realistic chamber geometry !!!!
578 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
579 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
580 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
582 // add smearing from resolution
583 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
584 hitForRec->SetNonBendingCoor(nonBendCoor
585 + gRandom->Gaus(0., fNonBendingResolution));
586 // // !!!! without smearing
587 // hitForRec->SetBendingCoor(bendCoor);
588 // hitForRec->SetNonBendingCoor(nonBendCoor);
589 // more information into HitForRec
590 // resolution: angular effect to be added here ????
591 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
592 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
594 hitForRec->SetHitNumber(HitNumber);
595 hitForRec->SetTHTrack(TrackNumber);
596 hitForRec->SetGeantSignal(Signal);
597 if (fPrintLevel >= 10) {
598 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
600 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
605 //__________________________________________________________________________
606 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
608 // Sort HitsForRec's in increasing order with respect to chamber number.
609 // Uses the function "Compare".
610 // Update the information for HitsForRec per chamber too.
611 Int_t ch, nhits, prevch;
612 fHitsForRecPtr->Sort();
613 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
614 fNHitsForRecPerChamber[ch] = 0;
615 fIndexOfFirstHitForRecPerChamber[ch] = 0;
617 prevch = 0; // previous chamber
618 nhits = 0; // number of hits in current chamber
619 // Loop over HitsForRec
620 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
621 // chamber number (0...)
622 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
623 // increment number of hits in current chamber
624 (fNHitsForRecPerChamber[ch])++;
625 // update index of first HitForRec in current chamber
626 // if chamber number different from previous one
628 fIndexOfFirstHitForRecPerChamber[ch] = hit;
635 // //__________________________________________________________________________
636 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
638 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
639 // // To add to the list of hits for reconstruction
640 // // the (cathode correlated) raw clusters
641 // // No condition added, like in Fortran TRACKF_STAT,
642 // // on the radius between RMin and RMax.
643 // AliMUONHitForRec *hitForRec;
644 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
645 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
646 // // Security on MUON ????
647 // // Loop over tracking chambers
648 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
649 // // number of HitsForRec to 0 for the chamber
650 // fNHitsForRecPerChamber[ch] = 0;
651 // // index of first HitForRec for the chamber
652 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
653 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
654 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
655 // MUON->ResetReconstHits();
657 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
658 // // Loop over (cathode correlated) raw clusters
659 // for (Int_t cor = 0; cor < ncor; cor++) {
660 // AliMUONReconstHit * mCor =
661 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
662 // // new AliMUONHitForRec from (cathode correlated) raw cluster
663 // // and increment number of AliMUONHitForRec's (total and in chamber)
664 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
666 // (fNHitsForRecPerChamber[ch])++;
667 // // more information into HitForRec
668 // hitForRec->SetChamberNumber(ch);
669 // hitForRec->SetHitNumber(cor);
670 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
671 // // could (should) be more exact from chamber geometry ????
672 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
673 // if (fPrintLevel >= 10) {
674 // cout << "chamber (0...): " << ch <<
675 // " cathcorrel (0...): " << cor << endl;
677 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
678 // hitForRec->Dump();}
679 // } // end of cluster loop
680 // } // end of chamber loop
684 //__________________________________________________________________________
685 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
687 // To add to the list of hits for reconstruction all the raw clusters
688 // No condition added, like in Fortran TRACKF_STAT,
689 // on the radius between RMin and RMax.
690 AliMUONHitForRec *hitForRec;
691 AliMUONRawCluster *clus;
692 Int_t iclus, nclus, nTRentries;
693 TClonesArray *rawclusters;
694 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
696 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
697 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
700 Error("MakeEventToBeReconstructed",
701 "Can not find Run Loader in Event Folder named %s.",
705 AliLoader* gime = rl->GetLoader("MUONLoader");
708 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
711 // Loading AliRun master
713 gAlice = rl->GetAliRun();
715 // Loading MUON subsystem
716 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
718 // AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
719 // Security on MUON ????
720 //pMUON->ResetRawClusters();
721 nTRentries = Int_t(TR->GetEntries());
722 if (nTRentries != 1) {
723 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
725 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
728 gime->TreeR()->GetEvent(0); // only one entry
729 // Loop over tracking chambers
730 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
731 // number of HitsForRec to 0 for the chamber
732 fNHitsForRecPerChamber[ch] = 0;
733 // index of first HitForRec for the chamber
734 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
735 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
736 rawclusters = pMUON->GetMUONData()->RawClusters(ch);
737 // pMUON->ResetRawClusters();
738 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
739 nclus = (Int_t) (rawclusters->GetEntries());
740 // Loop over (cathode correlated) raw clusters
741 for (iclus = 0; iclus < nclus; iclus++) {
742 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
743 // new AliMUONHitForRec from raw cluster
744 // and increment number of AliMUONHitForRec's (total and in chamber)
745 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
747 (fNHitsForRecPerChamber[ch])++;
748 // more information into HitForRec
749 // resolution: info should be already in raw cluster and taken from it ????
750 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
751 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
752 // original raw cluster
753 hitForRec->SetChamberNumber(ch);
754 hitForRec->SetHitNumber(iclus);
755 // Z coordinate of the raw cluster (cm)
756 hitForRec->SetZ(clus->fZ[0]);
757 if (fPrintLevel >= 10) {
758 cout << "chamber (0...): " << ch <<
759 " raw cluster (0...): " << iclus << endl;
761 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
763 } // end of cluster loop
764 } // end of chamber loop
765 SortHitsForRecWithIncreasingChamber(); //AZ
769 //__________________________________________________________________________
770 void AliMUONEventReconstructor::MakeSegments(void)
772 // To make the list of segments in all stations,
773 // from the list of hits to be reconstructed
774 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
776 // Loop over stations
777 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
778 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
779 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
780 MakeSegmentsPerStation(st);
781 if (fPrintLevel >= 10) {
782 cout << "end of MakeSegments" << endl;
783 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
784 cout << "station(0...): " << st
785 << " Segments: " << fNSegments[st]
788 seg < fNSegments[st];
790 cout << "Segment index(0...): " << seg << endl;
791 ((*fSegmentsPtr[st])[seg])->Dump();
798 //__________________________________________________________________________
799 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
801 // To make the list of segments in station number "Station" (0...)
802 // from the list of hits to be reconstructed.
803 // Updates "fNSegments"[Station].
804 // Segments in stations 4 and 5 are sorted
805 // according to increasing absolute value of "impact parameter"
806 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
807 AliMUONSegment *segment;
809 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
810 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
811 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
812 if (fPrintLevel >= 1)
813 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
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 ????
831 Double_t extrapFact =
832 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
833 // index for current segment
834 Int_t segmentIndex = 0;
835 // Loop over HitsForRec in the first chamber of the station
836 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
837 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
839 // pointer to the HitForRec
840 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
842 // on the straight line joining the HitForRec to the vertex (0,0,0),
843 // to the Z of the second chamber of the station
844 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
845 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
846 // Loop over HitsForRec in the second chamber of the station
847 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
848 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
850 // pointer to the HitForRec
851 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
852 // absolute values of distances, in bending and non bending planes,
853 // between the HitForRec in the second chamber
854 // and the previous extrapolation
855 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
856 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
859 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
860 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
861 // absolute value of impact parameter
863 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
865 // check for distances not too large,
866 // and impact parameter not too big if stations downstream of the dipole.
867 // Conditions "distBend" and "impactParam" correlated for these stations ????
868 if ((distBend < fSegmentMaxDistBending[Station]) &&
869 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
870 (!last2st || (impactParam < maxImpactParam)) &&
871 (!last2st || (impactParam > minImpactParam))) {
873 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
874 AliMUONSegment(hit1Ptr, hit2Ptr);
875 // update "link" to this segment from the hit in the first chamber
876 if (hit1Ptr->GetNSegments() == 0)
877 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
878 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
879 if (fPrintLevel >= 10) {
880 cout << "segmentIndex(0...): " << segmentIndex
881 << " distBend: " << distBend
882 << " distNonBend: " << distNonBend
885 cout << "HitForRec in first chamber" << endl;
887 cout << "HitForRec in second chamber" << endl;
890 // increment index for current segment
894 } // for (Int_t hit1...
895 fNSegments[Station] = segmentIndex;
896 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
897 // i.e. Station(0..4) 3 or 4, using the function "Compare".
898 // After this sorting, it is impossible to use
899 // the "fNSegments" and "fIndexOfFirstSegment"
900 // of the HitForRec in the first chamber to explore all segments formed with it.
901 // Is this sorting really needed ????
902 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
903 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
904 << fNSegments[Station] << endl;
908 //__________________________________________________________________________
909 void AliMUONEventReconstructor::MakeTracks(void)
911 // To make the tracks,
912 // from the list of segments and points in all stations
913 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
914 // The order may be important for the following Reset's
917 if (fTrackMethod == 2) { //AZ - Kalman filter
918 MakeTrackCandidatesK();
919 // Follow tracks in stations(1..) 3, 2 and 1
921 // Remove double tracks
922 RemoveDoubleTracksK();
923 // Propagate tracks to the vertex thru absorber
926 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
927 MakeTrackCandidates();
928 // Follow tracks in stations(1..) 3, 2 and 1
930 // Remove double tracks
931 RemoveDoubleTracks();
936 //__________________________________________________________________________
937 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
939 // To make track candidates with two segments in stations(1..) 4 and 5,
940 // the first segment being pointed to by "BegSegment".
941 // Returns the number of such track candidates.
942 Int_t endStation, iEndSegment, nbCan2Seg;
943 AliMUONSegment *endSegment, *extrapSegment;
944 AliMUONTrack *recTrack;
946 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
947 // Station for the end segment
948 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
949 // multiple scattering factor corresponding to one chamber
951 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
952 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
953 // linear extrapolation to end station
955 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
956 // number of candidates with 2 segments to 0
958 // Loop over segments in the end station
959 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
960 // pointer to segment
961 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
962 // test compatibility between current segment and "extrapSegment"
963 // 4 because 4 quantities in chi2
965 NormalizedChi2WithSegment(extrapSegment,
966 fMaxSigma2Distance)) <= 4.0) {
967 // both segments compatible:
968 // make track candidate from "begSegment" and "endSegment"
969 if (fPrintLevel >= 2)
970 cout << "TrackCandidate with Segment " << iEndSegment <<
971 " in Station(0..) " << endStation << endl;
972 // flag for both segments in one track:
973 // to be done in track constructor ????
974 BegSegment->SetInTrack(kTRUE);
975 endSegment->SetInTrack(kTRUE);
976 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
977 AliMUONTrack(BegSegment, endSegment, this);
979 if (fPrintLevel >= 10) recTrack->RecursiveDump();
980 // increment number of track candidates with 2 segments
983 } // for (iEndSegment = 0;...
984 delete extrapSegment; // should not delete HitForRec's it points to !!!!
988 //__________________________________________________________________________
989 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
991 // To make track candidates with one segment and one point
992 // in stations(1..) 4 and 5,
993 // the segment being pointed to by "BegSegment".
994 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
995 AliMUONHitForRec *extrapHitForRec, *hit;
996 AliMUONTrack *recTrack;
998 if (fPrintLevel >= 1)
999 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1000 // station for the end point
1001 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1002 // multiple scattering factor corresponding to one chamber
1003 mcsFactor = 0.0136 /
1004 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1005 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1006 // first and second chambers(0..) in the end station
1007 ch1 = 2 * endStation;
1009 // number of candidates to 0
1011 // Loop over chambers of the end station
1012 for (ch = ch2; ch >= ch1; ch--) {
1013 // linear extrapolation to chamber
1015 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1016 // limits for the hit index in the loop
1017 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1018 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1019 // Loop over HitForRec's in the chamber
1020 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1021 // pointer to HitForRec
1022 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1023 // test compatibility between current HitForRec and "extrapHitForRec"
1024 // 2 because 2 quantities in chi2
1026 NormalizedChi2WithHitForRec(extrapHitForRec,
1027 fMaxSigma2Distance)) <= 2.0) {
1028 // both HitForRec's compatible:
1029 // make track candidate from begSegment and current HitForRec
1030 if (fPrintLevel >= 2)
1031 cout << "TrackCandidate with HitForRec " << iHit <<
1032 " in Chamber(0..) " << ch << endl;
1033 // flag for beginning segments in one track:
1034 // to be done in track constructor ????
1035 BegSegment->SetInTrack(kTRUE);
1036 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1037 AliMUONTrack(BegSegment, hit, this);
1038 // the right place to eliminate "double counting" ???? how ????
1040 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1041 // increment number of track candidates
1044 } // for (iHit = iHitMin;...
1045 delete extrapHitForRec;
1046 } // for (ch = ch2;...
1047 return nbCan1Seg1Hit;
1050 //__________________________________________________________________________
1051 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1053 // To make track candidates
1054 // with at least 3 aligned points in stations(1..) 4 and 5
1055 // (two Segment's or one Segment and one HitForRec)
1056 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1057 AliMUONSegment *begSegment;
1058 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1059 // Loop over stations(1..) 5 and 4 for the beginning segment
1060 for (begStation = 4; begStation > 2; begStation--) {
1061 // Loop over segments in the beginning station
1062 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1063 // pointer to segment
1064 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1065 if (fPrintLevel >= 2)
1066 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1067 " in Station(0..) " << begStation << endl;
1068 // Look for track candidates with two segments,
1069 // "begSegment" and all compatible segments in other station.
1070 // Only for beginning station(1..) 5
1071 // because candidates with 2 segments have to looked for only once.
1072 if (begStation == 4)
1073 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1074 // Look for track candidates with one segment and one point,
1075 // "begSegment" and all compatible HitForRec's in other station.
1076 // Only if "begSegment" does not belong already to a track candidate.
1077 // Is that a too strong condition ????
1078 if (!(begSegment->GetInTrack()))
1079 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1080 } // for (iBegSegment = 0;...
1081 } // for (begStation = 4;...
1085 //__________________________________________________________________________
1086 void AliMUONEventReconstructor::FollowTracks(void)
1088 // Follow tracks in stations(1..) 3, 2 and 1
1089 // too long: should be made more modular !!!!
1090 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1091 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1092 AliMUONTrack *track, *nextTrack;
1093 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1094 // -1 to avoid compilation warnings
1095 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1096 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1097 Double_t bendingMomentum, chi2Norm = 0.;
1098 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1099 // local maxSigma2Distance, for easy increase in testing
1100 maxSigma2Distance = fMaxSigma2Distance;
1101 if (fPrintLevel >= 2)
1102 cout << "enter FollowTracks" << endl;
1103 // Loop over track candidates
1104 track = (AliMUONTrack*) fRecTracksPtr->First();
1107 // Follow function for each track candidate ????
1109 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1110 if (fPrintLevel >= 2)
1111 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1112 // Fit track candidate
1113 track->SetFitMCS(0); // without multiple Coulomb scattering
1114 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1115 track->SetFitStart(0); // from parameters at vertex
1117 if (fPrintLevel >= 10) {
1118 cout << "FollowTracks: track candidate(0..): " << trackIndex
1119 << " after fit in stations(0..) 3 and 4" << endl;
1120 track->RecursiveDump();
1122 // Loop over stations(1..) 3, 2 and 1
1123 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1124 // otherwise: majority coincidence 2 !!!!
1125 for (station = 2; station >= 0; station--) {
1126 // Track parameters at first track hit (smallest Z)
1127 trackParam1 = ((AliMUONTrackHit*)
1128 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1129 // extrapolation to station
1130 trackParam1->ExtrapToStation(station, trackParam);
1131 extrapSegment = new AliMUONSegment(); // empty segment
1132 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1133 // multiple scattering factor corresponding to one chamber
1134 // and momentum in bending plane (not total)
1135 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1136 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1137 // Z difference from previous station
1138 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1139 (&(pMUON->Chamber(2 * station + 2)))->Z();
1140 // Z difference between the two previous stations
1141 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1142 (&(pMUON->Chamber(2 * station + 4)))->Z();
1143 // Z difference between the two chambers in the previous station
1144 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1145 (&(pMUON->Chamber(2 * station + 1)))->Z();
1146 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1148 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1149 extrapSegment->UpdateFromStationTrackParam
1150 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1151 trackParam1->GetInverseBendingMomentum());
1152 // same thing for corrected segment
1153 // better to use copy constructor, after checking that it works properly !!!!
1154 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1156 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1157 extrapCorrSegment->UpdateFromStationTrackParam
1158 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1159 trackParam1->GetInverseBendingMomentum());
1162 if (fPrintLevel >= 10) {
1163 cout << "FollowTracks: track candidate(0..): " << trackIndex
1164 << " Look for segment in station(0..): " << station << endl;
1166 // Loop over segments in station
1167 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1168 // Look for best compatible Segment in station
1169 // should consider all possibilities ????
1170 // multiple scattering ????
1171 // separation in 2 functions: Segment and HitForRec ????
1172 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1173 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1174 // according to real Z value of "segment" and slopes of "extrapSegment"
1176 SetBendingCoor(extrapSegment->GetBendingCoor() +
1177 extrapSegment->GetBendingSlope() *
1178 (segment->GetHitForRec1()->GetZ() -
1179 (&(pMUON->Chamber(2 * station)))->Z()));
1181 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1182 extrapSegment->GetNonBendingSlope() *
1183 (segment->GetHitForRec1()->GetZ() -
1184 (&(pMUON->Chamber(2 * station)))->Z()));
1186 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1187 if (chi2 < bestChi2) {
1188 // update best Chi2 and Segment if better found
1189 bestSegment = segment;
1194 // best segment found: add it to track candidate
1195 track->AddSegment(bestSegment);
1196 // set track parameters at these two TrakHit's
1197 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1198 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1199 if (fPrintLevel >= 10) {
1200 cout << "FollowTracks: track candidate(0..): " << trackIndex
1201 << " Added segment in station(0..): " << station << endl;
1202 track->RecursiveDump();
1206 // No best segment found:
1207 // Look for best compatible HitForRec in station:
1208 // should consider all possibilities ????
1209 // multiple scattering ???? do about like for extrapSegment !!!!
1210 extrapHit = new AliMUONHitForRec(); // empty hit
1211 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1214 if (fPrintLevel >= 10) {
1215 cout << "FollowTracks: track candidate(0..): " << trackIndex
1216 << " Segment not found, look for hit in station(0..): " << station
1219 // Loop over chambers of the station
1220 for (chInStation = 0; chInStation < 2; chInStation++) {
1221 // coordinates of extrapolated hit
1223 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1225 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1226 // resolutions from "extrapSegment"
1227 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1228 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1229 // same things for corrected hit
1230 // better to use copy constructor, after checking that it works properly !!!!
1232 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1234 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1235 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1236 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1237 // Loop over hits in the chamber
1238 ch = 2 * station + chInStation;
1239 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1240 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1241 fNHitsForRecPerChamber[ch];
1243 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1244 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1245 // according to real Z value of "hit" and slopes of right "trackParam"
1247 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1248 (&(trackParam[chInStation]))->GetBendingSlope() *
1250 (&(trackParam[chInStation]))->GetZ()));
1252 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1253 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1255 (&(trackParam[chInStation]))->GetZ()));
1256 // condition for hit not already in segment ????
1257 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1258 if (chi2 < bestChi2) {
1259 // update best Chi2 and HitForRec if better found
1262 chBestHit = chInStation;
1267 // best hit found: add it to track candidate
1268 track->AddHitForRec(bestHit);
1269 // set track parameters at this TrackHit
1270 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1271 &(trackParam[chBestHit]));
1272 if (fPrintLevel >= 10) {
1273 cout << "FollowTracks: track candidate(0..): " << trackIndex
1274 << " Added hit in station(0..): " << station << endl;
1275 track->RecursiveDump();
1279 // Remove current track candidate
1280 // and corresponding TrackHit's, ...
1282 delete extrapSegment;
1283 delete extrapCorrSegment;
1285 delete extrapCorrHit;
1286 break; // stop the search for this candidate:
1287 // exit from the loop over station
1290 delete extrapCorrHit;
1292 delete extrapSegment;
1293 delete extrapCorrSegment;
1294 // Sort track hits according to increasing Z
1295 track->GetTrackHitsPtr()->Sort();
1296 // Update track parameters at first track hit (smallest Z)
1297 trackParam1 = ((AliMUONTrackHit*)
1298 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1299 bendingMomentum = 0.;
1300 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1301 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1302 // Track removed if bendingMomentum not in window [min, max]
1303 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1305 break; // stop the search for this candidate:
1306 // exit from the loop over station
1309 // with multiple Coulomb scattering if all stations
1310 if (station == 0) track->SetFitMCS(1);
1311 // without multiple Coulomb scattering if not all stations
1312 else track->SetFitMCS(0);
1313 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1314 track->SetFitStart(1); // from parameters at first hit
1316 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1317 if (numberOfDegFree > 0) {
1318 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1322 // Track removed if normalized chi2 too high
1323 if (chi2Norm > fMaxChi2) {
1325 break; // stop the search for this candidate:
1326 // exit from the loop over station
1328 if (fPrintLevel >= 10) {
1329 cout << "FollowTracks: track candidate(0..): " << trackIndex
1330 << " after fit from station(0..): " << station << " to 4" << endl;
1331 track->RecursiveDump();
1333 // Track extrapolation to the vertex through the absorber (Branson)
1334 // after going through the first station
1336 trackParamVertex = *trackParam1;
1337 (&trackParamVertex)->ExtrapToVertex();
1338 track->SetTrackParamAtVertex(&trackParamVertex);
1339 if (fPrintLevel >= 1) {
1340 cout << "FollowTracks: track candidate(0..): " << trackIndex
1341 << " after extrapolation to vertex" << endl;
1342 track->RecursiveDump();
1345 } // for (station = 2;...
1346 // go really to next track
1349 // Compression of track array (necessary after Remove ????)
1350 fRecTracksPtr->Compress();
1354 //__________________________________________________________________________
1355 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1357 // To remove double tracks.
1358 // Tracks are considered identical
1359 // if they have at least half of their hits in common.
1360 // Among two identical tracks, one keeps the track with the larger number of hits
1361 // or, if these numbers are equal, the track with the minimum Chi2.
1362 AliMUONTrack *track1, *track2, *trackToRemove;
1363 Bool_t identicalTracks;
1364 Int_t hitsInCommon, nHits1, nHits2;
1365 identicalTracks = kTRUE;
1366 while (identicalTracks) {
1367 identicalTracks = kFALSE;
1368 // Loop over first track of the pair
1369 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1370 while (track1 && (!identicalTracks)) {
1371 nHits1 = track1->GetNTrackHits();
1372 // Loop over second track of the pair
1373 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1374 while (track2 && (!identicalTracks)) {
1375 nHits2 = track2->GetNTrackHits();
1376 // number of hits in common between two tracks
1377 hitsInCommon = track1->HitsInCommon(track2);
1378 // check for identical tracks
1379 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1380 identicalTracks = kTRUE;
1381 // decide which track to remove
1382 if (nHits1 > nHits2) trackToRemove = track2;
1383 else if (nHits1 < nHits2) trackToRemove = track1;
1384 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1385 trackToRemove = track2;
1386 else trackToRemove = track1;
1388 trackToRemove->Remove();
1390 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1392 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1398 //__________________________________________________________________________
1399 void AliMUONEventReconstructor::EventDump(void)
1401 // Dump reconstructed event (track parameters at vertex and at first hit),
1402 // and the particle parameters
1404 AliMUONTrack *track;
1405 AliMUONTrackParam *trackParam, *trackParam1;
1406 Double_t bendingSlope, nonBendingSlope, pYZ;
1407 Double_t pX, pY, pZ, x, y, z, c;
1408 Int_t np, trackIndex, nTrackHits;
1410 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1411 if (fPrintLevel >= 1) {
1412 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1414 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1415 // Loop over reconstructed tracks
1416 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1417 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1418 if (fPrintLevel >= 1)
1419 cout << " track number: " << trackIndex << endl;
1420 // function for each track for modularity ????
1421 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1422 nTrackHits = track->GetNTrackHits();
1423 if (fPrintLevel >= 1)
1424 cout << " number of track hits: " << nTrackHits << endl;
1425 // track parameters at Vertex
1426 trackParam = track->GetTrackParamAtVertex();
1427 x = trackParam->GetNonBendingCoor();
1428 y = trackParam->GetBendingCoor();
1429 z = trackParam->GetZ();
1430 bendingSlope = trackParam->GetBendingSlope();
1431 nonBendingSlope = trackParam->GetNonBendingSlope();
1432 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1433 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1434 pX = pZ * nonBendingSlope;
1435 pY = pZ * bendingSlope;
1436 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1437 if (fPrintLevel >= 1)
1438 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1439 z, x, y, pX, pY, pZ, c);
1441 // track parameters at first hit
1442 trackParam1 = ((AliMUONTrackHit*)
1443 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1444 x = trackParam1->GetNonBendingCoor();
1445 y = trackParam1->GetBendingCoor();
1446 z = trackParam1->GetZ();
1447 bendingSlope = trackParam1->GetBendingSlope();
1448 nonBendingSlope = trackParam1->GetNonBendingSlope();
1449 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1450 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1451 pX = pZ * nonBendingSlope;
1452 pY = pZ * bendingSlope;
1453 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1454 if (fPrintLevel >= 1)
1455 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1456 z, x, y, pX, pY, pZ, c);
1458 // informations about generated particles
1459 np = gAlice->GetNtrack();
1460 printf(" **** number of generated particles: %d \n", np);
1462 // for (Int_t iPart = 0; iPart < np; iPart++) {
1463 // p = gAlice->Particle(iPart);
1464 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1465 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1470 void AliMUONEventReconstructor::FillEvent()
1472 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1473 // leaf in the Event branch of TreeRecoEvent tree
1474 cout << "Enter FillEvent() ...\n";
1477 fRecoEvent = new AliMUONRecoEvent();
1479 fRecoEvent->Clear();
1481 //save current directory
1482 TDirectory *current = gDirectory;
1483 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1484 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1485 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1486 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1487 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1488 TBranch *branch = fEventTree->GetBranch("Event");
1489 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1490 branch->SetAutoDelete();
1495 // restore directory
1499 //__________________________________________________________________________
1500 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1502 // To make initial tracks for Kalman filter from the list of segments
1504 AliMUONSegment *segment;
1505 AliMUONTrackK *trackK;
1507 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1508 // Reset the TClonesArray of reconstructed tracks
1509 if (fRecTracksPtr) fRecTracksPtr->Delete();
1510 // Delete in order that the Track destructors are called,
1511 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1514 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1515 // Loop over stations(1...) 5 and 4
1516 for (istat=4; istat>=3; istat--) {
1517 // Loop over segments in the station
1518 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1519 // Transform segments to tracks and evaluate covariance matrix
1520 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1521 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1523 } // for (iseg=0;...)
1524 } // for (istat=4;...)
1528 //__________________________________________________________________________
1529 void AliMUONEventReconstructor::FollowTracksK(void)
1531 // Follow tracks using Kalman filter
1533 Int_t icand, ichamBeg, ichamEnd, chamBits;
1534 Double_t zDipole1, zDipole2;
1535 AliMUONTrackK *trackK;
1536 AliMUONHitForRec *hit;
1537 AliMUONRawCluster *clus;
1538 TClonesArray *rawclusters;
1540 clus = 0; rawclusters = 0;
1542 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1543 zDipole2 = zDipole1 + GetSimpleBLength();
1546 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1547 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1548 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1549 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1551 cout << " Hit #" << hit->GetChamberNumber() << " ";
1552 cout << hit->GetBendingCoor() << " ";
1553 cout << hit->GetNonBendingCoor() << " ";
1554 cout << hit->GetZ() << " ";
1555 cout << hit->GetGeantSignal() << " ";
1556 cout << hit->GetTHTrack() << endl;
1559 printf(" Hit # %d %10.4f %10.4f %10.4f",
1560 hit->GetChamberNumber(), hit->GetBendingCoor(),
1561 hit->GetNonBendingCoor(), hit->GetZ());
1562 if (fRecGeantHits) {
1564 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1566 // from raw clusters
1567 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1568 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1570 printf("%3d", clus->fTracks[1]-1);
1571 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1578 Int_t nSeeds = fNRecTracks; // starting number of seeds
1579 // Loop over track candidates
1580 while (icand < fNRecTracks-1) {
1582 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1584 // Discard candidate which will produce the double track
1586 Ok = CheckCandidateK(icand,nSeeds);
1588 //trackK->SetRecover(-1); // mark candidate to be removed
1594 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1595 trackK->GetHitOnTrack()->Last(); // last hit
1596 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1597 ichamBeg = hit->GetChamberNumber();
1599 // Check propagation direction
1600 if (trackK->GetTrackDir() > 0) {
1601 ichamEnd = 9; // forward propagation
1602 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1604 ichamBeg = ichamEnd;
1605 ichamEnd = 6; // backward propagation
1606 // Change weight matrix and zero fChi2 for backpropagation
1607 trackK->StartBack();
1608 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1609 ichamBeg = ichamEnd;
1613 if (trackK->GetBPFlag()) {
1615 ichamEnd = 6; // backward propagation
1616 // Change weight matrix and zero fChi2 for backpropagation
1617 trackK->StartBack();
1618 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1619 ichamBeg = ichamEnd;
1625 trackK->SetTrackDir(-1);
1626 trackK->SetBPFlag(kFALSE);
1627 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1629 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1630 else trackK->SetRecover(-1); // mark candidate to be removed
1632 // Majority 3 of 4 in first 2 stations
1634 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1635 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1636 chamBits |= BIT(hit->GetChamberNumber()-1);
1638 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1639 //mark candidate to be removed
1642 for (Int_t i=0; i<fNRecTracks; i++) {
1643 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1644 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1647 // Compress TClonesArray
1648 fRecTracksPtr->Compress();
1649 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1653 //__________________________________________________________________________
1654 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1656 // Discards track candidate if it will produce the double track (having
1657 // the same seed segment hits as hits of a good track found before)
1658 AliMUONTrackK *track1, *track2;
1659 AliMUONHitForRec *hit1, *hit2, *hit;
1661 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1662 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1663 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1665 for (Int_t i=0; i<icand; i++) {
1666 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1667 //if (track2->GetRecover() < 0) continue;
1668 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1670 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1674 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1675 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1676 if (hit == hit1 || hit == hit2) {
1678 if (nSame == 2) return kFALSE;
1680 } // for (Int_t j=0;
1682 } // for (Int_t i=0;
1686 //__________________________________________________________________________
1687 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1689 // Removes double tracks (sharing more than half of their hits). Keeps
1690 // the track with higher quality
1691 AliMUONTrackK *track1, *track2, *trackToKill;
1693 // Sort tracks according to their quality
1694 fRecTracksPtr->Sort();
1696 // Loop over first track of the pair
1697 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1699 // Loop over second track of the pair
1700 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1702 // Check whether or not to keep track2
1703 if (!track2->KeepTrack(track1)) {
1704 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1705 " " << track2->GetTrackQuality() << endl;
1706 trackToKill = track2;
1707 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1708 trackToKill->Kill();
1709 fRecTracksPtr->Compress();
1710 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1712 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1715 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1716 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1719 //__________________________________________________________________________
1720 void AliMUONEventReconstructor::GoToVertex(void)
1722 // Propagates track to the vertex thru absorber
1723 // (using Branson correction for now)
1727 for (Int_t i=0; i<fNRecTracks; i++) {
1728 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1729 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1730 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1731 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber