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
58 //************* Defaults parameters for reconstruction
59 static const Double_t kDefaultMinBendingMomentum = 3.0;
60 static const Double_t kDefaultMaxBendingMomentum = 500.0;
61 static const Double_t kDefaultMaxChi2 = 100.0;
62 static const Double_t kDefaultMaxSigma2Distance = 16.0;
63 static const Double_t kDefaultBendingResolution = 0.01;
64 static const Double_t kDefaultNonBendingResolution = 0.144;
65 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
66 // Simple magnetic field:
67 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
68 // Length and Position from reco_muon.F, with opposite sign:
69 // Length = ZMAGEND-ZCOIL
70 // Position = (ZMAGEND+ZCOIL)/2
71 // to be ajusted differently from real magnetic field ????
72 static const Double_t kDefaultSimpleBValue = 7.0;
73 static const Double_t kDefaultSimpleBLength = 428.0;
74 static const Double_t kDefaultSimpleBPosition = 1019.0;
75 static const Int_t kDefaultRecGeantHits = 0;
76 static const Double_t kDefaultEfficiency = 0.95;
78 static const Int_t kDefaultPrintLevel = 0;
80 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
82 //__________________________________________________________________________
83 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
85 // Constructor for class AliMUONEventReconstructor
86 SetReconstructionParametersToDefaults();
87 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
88 // Memory allocation for the TClonesArray of hits for reconstruction
89 // Is 10000 the right size ????
90 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
91 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
92 // Memory allocation for the TClonesArray's of segments in stations
93 // Is 2000 the right size ????
94 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
95 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
96 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
98 // Memory allocation for the TClonesArray of reconstructed tracks
99 // Is 10 the right size ????
100 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
101 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
102 // Memory allocation for the TClonesArray of hits on reconstructed tracks
103 // Is 100 the right size ????
104 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
105 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
107 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
109 x[0] = 50.; x[1] = 50.; x[2] = 950.;
110 gAlice->Field()->Field(x, b);
111 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
112 // See how to get fSimple(BValue, BLength, BPosition)
113 // automatically calculated from the actual magnetic field ????
115 if (fPrintLevel >= 0) {
116 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
117 cout << endl << "Magnetic field from root file:" << endl;
118 gAlice->Field()->Dump();
122 // Initializions for GEANT background events
125 fBkgGeantParticles = 0;
128 fBkgGeantEventNumber = -1;
130 // Initialize to 0 pointers to RecoEvent, tree and tree file
138 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
140 // Dummy copy constructor
143 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
145 // Dummy assignment operator
149 //__________________________________________________________________________
150 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
152 // Destructor for class AliMUONEventReconstructor
157 // if (fEventTree) delete fEventTree;
158 if (fRecoEvent) delete fRecoEvent;
159 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
160 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
161 delete fSegmentsPtr[st]; // Correct destruction of everything ????
165 //__________________________________________________________________________
166 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
168 // Set reconstruction parameters to default values
169 // Would be much more convenient with a structure (or class) ????
170 fMinBendingMomentum = kDefaultMinBendingMomentum;
171 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
172 fMaxChi2 = kDefaultMaxChi2;
173 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
175 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
176 // ******** Parameters for making HitsForRec
178 // like in TRACKF_STAT:
179 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
180 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
181 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
182 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
183 2.0 * TMath::Pi() / 180.0;
184 else fRMin[ch] = 30.0;
185 // maximum radius at 10 degrees and Z of chamber
186 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
187 10.0 * TMath::Pi() / 180.0;
190 // ******** Parameters for making segments
191 // should be parametrized ????
192 // according to interval between chambers in a station ????
193 // Maximum distance in non bending plane
194 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
196 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
197 fSegmentMaxDistNonBending[st] = 5. * 0.22;
198 // Maximum distance in bending plane:
199 // values from TRACKF_STAT, corresponding to (J psi 20cm),
200 // scaled to the real distance between chambers in a station
201 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
202 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
203 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
204 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
205 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
206 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
207 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
208 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
209 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
210 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
212 fBendingResolution = kDefaultBendingResolution;
213 fNonBendingResolution = kDefaultNonBendingResolution;
214 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
215 fSimpleBValue = kDefaultSimpleBValue;
216 fSimpleBLength = kDefaultSimpleBLength;
217 fSimpleBPosition = kDefaultSimpleBPosition;
218 fRecGeantHits = kDefaultRecGeantHits;
219 fEfficiency = kDefaultEfficiency;
220 fPrintLevel = kDefaultPrintLevel;
224 //__________________________________________________________________________
225 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
227 // Returns impact parameter at vertex in bending plane (cm),
228 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
229 // using simple values for dipole magnetic field.
230 // The sign of "BendingMomentum" is the sign of the charge.
231 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
235 //__________________________________________________________________________
236 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
238 // Returns signed bending momentum in bending plane (GeV/c),
239 // the sign being the sign of the charge for particles moving forward in Z,
240 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
241 // using simple values for dipole magnetic field.
242 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
246 //__________________________________________________________________________
247 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
249 // Set background file ... for GEANT hits
250 // Must be called after having loaded the firts signal event
251 if (fPrintLevel >= 0) {
252 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
253 << BkgGeantFileName << "''" << endl;}
254 if (strlen(BkgGeantFileName)) {
255 // BkgGeantFileName not empty: try to open the file
256 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
257 fBkgGeantFile = new TFile(BkgGeantFileName);
258 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
259 if (fBkgGeantFile-> IsOpen()) {
260 if (fPrintLevel >= 0) {
261 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
262 << "'' successfully opened" << endl;}
265 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
266 cout << "NOT FOUND: EXIT" << endl;
267 exit(0); // right instruction for exit ????
269 // Arrays for "particles" and "hits"
270 fBkgGeantParticles = new TClonesArray("TParticle", 200);
271 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
272 // Event number to -1 for initialization
273 fBkgGeantEventNumber = -1;
274 // Back to the signal file:
275 // first signal event must have been loaded previously,
276 // otherwise, Segmentation violation at the next instruction
277 // How is it possible to do smething better ????
278 ((gAlice->TreeK())->GetCurrentFile())->cd();
279 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
284 //__________________________________________________________________________
285 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
287 // Get next event in background file for GEANT hits
288 // Goes back to event number 0 when end of file is reached
291 if (fPrintLevel >= 0) {
292 cout << "Enter NextBkgGeantEvent" << endl;}
293 // Clean previous event
294 if(fBkgGeantTK) delete fBkgGeantTK;
296 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
297 if(fBkgGeantTH) delete fBkgGeantTH;
299 if(fBkgGeantHits) fBkgGeantHits->Clear();
300 // Increment event number
301 fBkgGeantEventNumber++;
302 // Get access to Particles and Hits for event from background file
303 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
305 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
306 // Particles: TreeK for event and branch "Particles"
307 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
308 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
310 if (fPrintLevel >= 0) {
311 cout << "Cannot find Kine Tree for background event: " <<
312 fBkgGeantEventNumber << endl;
313 cout << "Goes back to event 0" << endl;
315 fBkgGeantEventNumber = 0;
316 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
317 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
319 cout << "ERROR: cannot find Kine Tree for background event: " <<
320 fBkgGeantEventNumber << endl;
325 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
326 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
327 // Hits: TreeH for event and branch "MUON"
328 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
329 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
331 cout << "ERROR: cannot find Hits Tree for background event: " <<
332 fBkgGeantEventNumber << endl;
335 if (fBkgGeantTH && fBkgGeantHits) {
336 branch = fBkgGeantTH->GetBranch("MUON");
337 if (branch) branch->SetAddress(&fBkgGeantHits);
339 fBkgGeantTH->GetEntries(); // necessary ????
340 // Back to the signal file
341 ((gAlice->TreeK())->GetCurrentFile())->cd();
342 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
346 //__________________________________________________________________________
347 void AliMUONEventReconstructor::EventReconstruct(void)
349 // To reconstruct one event
350 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
351 MakeEventToBeReconstructed();
357 //__________________________________________________________________________
358 void AliMUONEventReconstructor::ResetHitsForRec(void)
360 // To reset the array and the number of HitsForRec,
361 // and also the number of HitsForRec
362 // and the index of the first HitForRec per chamber
363 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
365 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
366 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
370 //__________________________________________________________________________
371 void AliMUONEventReconstructor::ResetSegments(void)
373 // To reset the TClonesArray of segments and the number of Segments
375 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
376 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
382 //__________________________________________________________________________
383 void AliMUONEventReconstructor::ResetTracks(void)
385 // To reset the TClonesArray of reconstructed tracks
386 if (fRecTracksPtr) fRecTracksPtr->Delete();
387 // Delete in order that the Track destructors are called,
388 // hence the space for the TClonesArray of pointers to TrackHit's is freed
393 //__________________________________________________________________________
394 void AliMUONEventReconstructor::ResetTrackHits(void)
396 // To reset the TClonesArray of hits on reconstructed tracks
397 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
402 //__________________________________________________________________________
403 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
405 // To make the list of hits to be reconstructed,
406 // either from the GEANT hits or from the raw clusters
407 // according to the parameter set for the reconstructor
408 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
410 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
413 Error("MakeEventToBeReconstructed",
414 "Can not find Run Loader in Event Folder named %s.",
418 AliLoader* gime = rl->GetLoader("MUONLoader");
421 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
425 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
427 if (fRecGeantHits == 1) {
428 // Reconstruction from GEANT hits
429 // Back to the signal file
430 TTree* treeH = gime->TreeH();
433 Int_t retval = gime->LoadHits();
436 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
439 treeH = gime->TreeH();
442 Error("MakeEventToBeReconstructed","Can not get TreeH");
447 AddHitsForRecFromGEANT(treeH);
450 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
451 // Sort HitsForRec in increasing order with respect to chamber number
452 SortHitsForRecWithIncreasingChamber();
455 // Reconstruction from raw clusters
456 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
457 // Security on MUON ????
458 // TreeR assumed to be be "prepared" in calling function
459 // by "MUON->GetTreeR(nev)" ????
460 TTree *treeR = gime->TreeR();
461 AddHitsForRecFromRawClusters(treeR);
462 // No sorting: it is done automatically in the previous function
464 if (fPrintLevel >= 10) {
465 cout << "end of MakeEventToBeReconstructed" << endl;
466 cout << "NHitsForRec: " << fNHitsForRec << endl;
467 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
468 cout << "chamber(0...): " << ch
469 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
470 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
472 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
473 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
475 cout << "HitForRec index(0...): " << hit << endl;
476 ((*fHitsForRecPtr)[hit])->Dump();
483 //__________________________________________________________________________
484 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
486 // To add to the list of hits for reconstruction
487 // the GEANT signal hits from a hit tree TH.
488 Int_t hitBits, chamBits; //AZ
489 if (fPrintLevel >= 2)
490 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
491 if (TH == NULL) return;
492 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
493 AliMUONData * muondata = pMUON->GetMUONData();
494 // Security on MUON ????
495 // See whether it could be the same for signal and background ????
496 // Loop over tracks in tree
497 Int_t ntracks = (Int_t) TH->GetEntries();
498 if (fPrintLevel >= 2)
499 cout << "ntracks: " << ntracks << endl;
501 for (Int_t track = 0; track < ntracks; track++) {
502 muondata->ResetHits();
508 Int_t itrack = track; //AZ
511 nhits = (Int_t) muondata->Hits()->GetEntriesFast();
512 AliMUONHit* mHit=0x0;
514 for(ihit=0; ihit<nhits; ihit++) {
515 mHit = static_cast<AliMUONHit*>(muondata->Hits()->At(ihit));
516 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
517 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
518 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
519 && itrack <= 2 && !BIT(mHit->Chamber()-1) ) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
522 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
523 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
525 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
526 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
527 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
528 } // end of track loop
532 //__________________________________________________________________________
533 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
535 // To add to the list of hits for reconstruction
536 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
537 // How to have only one function "AddHitsForRecFromGEANT" ????
538 if (fPrintLevel >= 2)
539 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
540 if (TH == NULL) return;
541 // Loop over tracks in tree
542 Int_t ntracks = (Int_t) TH->GetEntries();
543 if (fPrintLevel >= 2)
544 cout << "ntracks: " << ntracks << endl;
545 for (Int_t track = 0; track < ntracks; track++) {
546 if (Hits) Hits->Clear();
549 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
550 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
552 } // end of track loop
556 //__________________________________________________________________________
557 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
559 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
560 // with hit number "HitNumber" in the track numbered "TrackNumber",
561 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
562 // Selects hits in tracking (not trigger) chambers.
563 // Takes into account the efficiency (fEfficiency)
564 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
565 // Adds a condition on the radius between RMin and RMax
566 // to better simulate the real chambers.
567 // Returns the pointer to the new hit for reconstruction,
568 // or NULL in case of inefficiency or non tracking chamber or bad radius.
569 // No condition on at most 20 cm from a muon from a resonance
570 // like in Fortran TRACKF_STAT.
571 AliMUONHitForRec* hitForRec;
572 Double_t bendCoor, nonBendCoor, radius;
573 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
574 // only in tracking chambers (fChamber starts at 1)
575 if (chamber >= kMaxMuonTrackingChambers) return NULL;
576 // only if hit is efficient (keep track for checking ????)
577 if (gRandom->Rndm() > fEfficiency) return NULL;
578 // only if radius between RMin and RMax
580 nonBendCoor = Hit->X();
581 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
582 // This cut is not needed with a realistic chamber geometry !!!!
583 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
584 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
585 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
587 // add smearing from resolution
588 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
589 hitForRec->SetNonBendingCoor(nonBendCoor
590 + gRandom->Gaus(0., fNonBendingResolution));
591 // // !!!! without smearing
592 // hitForRec->SetBendingCoor(bendCoor);
593 // hitForRec->SetNonBendingCoor(nonBendCoor);
594 // more information into HitForRec
595 // resolution: angular effect to be added here ????
596 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
597 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
599 hitForRec->SetHitNumber(HitNumber);
600 hitForRec->SetTHTrack(TrackNumber);
601 hitForRec->SetGeantSignal(Signal);
602 if (fPrintLevel >= 10) {
603 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
605 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
610 //__________________________________________________________________________
611 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
613 // Sort HitsForRec's in increasing order with respect to chamber number.
614 // Uses the function "Compare".
615 // Update the information for HitsForRec per chamber too.
616 Int_t ch, nhits, prevch;
617 fHitsForRecPtr->Sort();
618 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
619 fNHitsForRecPerChamber[ch] = 0;
620 fIndexOfFirstHitForRecPerChamber[ch] = 0;
622 prevch = 0; // previous chamber
623 nhits = 0; // number of hits in current chamber
624 // Loop over HitsForRec
625 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
626 // chamber number (0...)
627 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
628 // increment number of hits in current chamber
629 (fNHitsForRecPerChamber[ch])++;
630 // update index of first HitForRec in current chamber
631 // if chamber number different from previous one
633 fIndexOfFirstHitForRecPerChamber[ch] = hit;
640 // //__________________________________________________________________________
641 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
643 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
644 // // To add to the list of hits for reconstruction
645 // // the (cathode correlated) raw clusters
646 // // No condition added, like in Fortran TRACKF_STAT,
647 // // on the radius between RMin and RMax.
648 // AliMUONHitForRec *hitForRec;
649 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
650 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
651 // // Security on MUON ????
652 // // Loop over tracking chambers
653 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
654 // // number of HitsForRec to 0 for the chamber
655 // fNHitsForRecPerChamber[ch] = 0;
656 // // index of first HitForRec for the chamber
657 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
658 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
659 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
660 // MUON->ResetReconstHits();
662 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
663 // // Loop over (cathode correlated) raw clusters
664 // for (Int_t cor = 0; cor < ncor; cor++) {
665 // AliMUONReconstHit * mCor =
666 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
667 // // new AliMUONHitForRec from (cathode correlated) raw cluster
668 // // and increment number of AliMUONHitForRec's (total and in chamber)
669 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
671 // (fNHitsForRecPerChamber[ch])++;
672 // // more information into HitForRec
673 // hitForRec->SetChamberNumber(ch);
674 // hitForRec->SetHitNumber(cor);
675 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
676 // // could (should) be more exact from chamber geometry ????
677 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
678 // if (fPrintLevel >= 10) {
679 // cout << "chamber (0...): " << ch <<
680 // " cathcorrel (0...): " << cor << endl;
682 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
683 // hitForRec->Dump();}
684 // } // end of cluster loop
685 // } // end of chamber loop
689 //__________________________________________________________________________
690 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
692 // To add to the list of hits for reconstruction all the raw clusters
693 // No condition added, like in Fortran TRACKF_STAT,
694 // on the radius between RMin and RMax.
695 AliMUONHitForRec *hitForRec;
696 AliMUONRawCluster *clus;
697 Int_t iclus, nclus, nTRentries;
698 TClonesArray *rawclusters;
699 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
701 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
702 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
705 Error("MakeEventToBeReconstructed",
706 "Can not find Run Loader in Event Folder named %s.",
710 AliLoader* gime = rl->GetLoader("MUONLoader");
713 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
716 // Loading AliRun master
718 gAlice = rl->GetAliRun();
720 // Loading MUON subsystem
721 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
723 nTRentries = Int_t(TR->GetEntries());
724 if (nTRentries != 1) {
725 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
727 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
730 gime->TreeR()->GetEvent(0); // only one entry
731 // Loop over tracking chambers
732 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
733 // number of HitsForRec to 0 for the chamber
734 fNHitsForRecPerChamber[ch] = 0;
735 // index of first HitForRec for the chamber
736 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
737 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
738 rawclusters = pMUON->GetMUONData()->RawClusters(ch);
739 // pMUON->ResetRawClusters();
740 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
741 nclus = (Int_t) (rawclusters->GetEntries());
742 // Loop over (cathode correlated) raw clusters
743 for (iclus = 0; iclus < nclus; iclus++) {
744 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
745 // new AliMUONHitForRec from raw cluster
746 // and increment number of AliMUONHitForRec's (total and in chamber)
747 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
749 (fNHitsForRecPerChamber[ch])++;
750 // more information into HitForRec
751 // resolution: info should be already in raw cluster and taken from it ????
752 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
753 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
754 // original raw cluster
755 hitForRec->SetChamberNumber(ch);
756 hitForRec->SetHitNumber(iclus);
757 // Z coordinate of the raw cluster (cm)
758 hitForRec->SetZ(clus->fZ[0]);
759 if (fPrintLevel >= 10) {
760 cout << "chamber (0...): " << ch <<
761 " raw cluster (0...): " << iclus << endl;
763 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
765 } // end of cluster loop
766 } // end of chamber loop
767 SortHitsForRecWithIncreasingChamber(); //AZ
771 //__________________________________________________________________________
772 void AliMUONEventReconstructor::MakeSegments(void)
774 // To make the list of segments in all stations,
775 // from the list of hits to be reconstructed
776 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
778 // Loop over stations
779 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
780 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
781 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
782 MakeSegmentsPerStation(st);
783 if (fPrintLevel >= 10) {
784 cout << "end of MakeSegments" << endl;
785 for (Int_t st = 0; st < kMaxMuonTrackingStations; 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 AliMUONEventReconstructor::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 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
814 if (fPrintLevel >= 1)
815 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
816 // first and second chambers (0...) in the station
817 Int_t ch1 = 2 * Station;
819 // variable true for stations downstream of the dipole:
820 // Station(0..4) equal to 3 or 4
821 if ((Station == 3) || (Station == 4)) {
823 // maximum impact parameter (cm) according to fMinBendingMomentum...
825 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
826 // minimum impact parameter (cm) according to fMaxBendingMomentum...
828 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
830 else last2st = kFALSE;
831 // extrapolation factor from Z of first chamber to Z of second chamber
832 // dZ to be changed to take into account fine structure of chambers ????
833 Double_t extrapFact =
834 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
835 // index for current segment
836 Int_t segmentIndex = 0;
837 // Loop over HitsForRec in the first chamber of the station
838 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
839 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
841 // pointer to the HitForRec
842 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
844 // on the straight line joining the HitForRec to the vertex (0,0,0),
845 // to the Z of the second chamber of the station
846 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
847 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
848 // Loop over HitsForRec in the second chamber of the station
849 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
850 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
852 // pointer to the HitForRec
853 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
854 // absolute values of distances, in bending and non bending planes,
855 // between the HitForRec in the second chamber
856 // and the previous extrapolation
857 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
858 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
861 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
862 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
863 // absolute value of impact parameter
865 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
867 // check for distances not too large,
868 // and impact parameter not too big if stations downstream of the dipole.
869 // Conditions "distBend" and "impactParam" correlated for these stations ????
870 if ((distBend < fSegmentMaxDistBending[Station]) &&
871 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
872 (!last2st || (impactParam < maxImpactParam)) &&
873 (!last2st || (impactParam > minImpactParam))) {
875 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
876 AliMUONSegment(hit1Ptr, hit2Ptr);
877 // update "link" to this segment from the hit in the first chamber
878 if (hit1Ptr->GetNSegments() == 0)
879 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
880 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
881 if (fPrintLevel >= 10) {
882 cout << "segmentIndex(0...): " << segmentIndex
883 << " distBend: " << distBend
884 << " distNonBend: " << distNonBend
887 cout << "HitForRec in first chamber" << endl;
889 cout << "HitForRec in second chamber" << endl;
892 // increment index for current segment
896 } // for (Int_t hit1...
897 fNSegments[Station] = segmentIndex;
898 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
899 // i.e. Station(0..4) 3 or 4, using the function "Compare".
900 // After this sorting, it is impossible to use
901 // the "fNSegments" and "fIndexOfFirstSegment"
902 // of the HitForRec in the first chamber to explore all segments formed with it.
903 // Is this sorting really needed ????
904 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
905 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
906 << fNSegments[Station] << endl;
910 //__________________________________________________________________________
911 void AliMUONEventReconstructor::MakeTracks(void)
913 // To make the tracks,
914 // from the list of segments and points in all stations
915 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
916 // The order may be important for the following Reset's
919 if (fTrackMethod == 2) { //AZ - Kalman filter
920 MakeTrackCandidatesK();
921 // Follow tracks in stations(1..) 3, 2 and 1
923 // Remove double tracks
924 RemoveDoubleTracksK();
925 // Propagate tracks to the vertex thru absorber
928 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
929 MakeTrackCandidates();
930 // Follow tracks in stations(1..) 3, 2 and 1
932 // Remove double tracks
933 RemoveDoubleTracks();
938 //__________________________________________________________________________
939 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
941 // To make track candidates with two segments in stations(1..) 4 and 5,
942 // the first segment being pointed to by "BegSegment".
943 // Returns the number of such track candidates.
944 Int_t endStation, iEndSegment, nbCan2Seg;
945 AliMUONSegment *endSegment, *extrapSegment;
946 AliMUONTrack *recTrack;
948 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
949 // Station for the end segment
950 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
951 // multiple scattering factor corresponding to one chamber
953 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
954 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
955 // linear extrapolation to end station
957 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
958 // number of candidates with 2 segments to 0
960 // Loop over segments in the end station
961 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
962 // pointer to segment
963 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
964 // test compatibility between current segment and "extrapSegment"
965 // 4 because 4 quantities in chi2
967 NormalizedChi2WithSegment(extrapSegment,
968 fMaxSigma2Distance)) <= 4.0) {
969 // both segments compatible:
970 // make track candidate from "begSegment" and "endSegment"
971 if (fPrintLevel >= 2)
972 cout << "TrackCandidate with Segment " << iEndSegment <<
973 " in Station(0..) " << endStation << endl;
974 // flag for both segments in one track:
975 // to be done in track constructor ????
976 BegSegment->SetInTrack(kTRUE);
977 endSegment->SetInTrack(kTRUE);
978 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
979 AliMUONTrack(BegSegment, endSegment, this);
981 if (fPrintLevel >= 10) recTrack->RecursiveDump();
982 // increment number of track candidates with 2 segments
985 } // for (iEndSegment = 0;...
986 delete extrapSegment; // should not delete HitForRec's it points to !!!!
990 //__________________________________________________________________________
991 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
993 // To make track candidates with one segment and one point
994 // in stations(1..) 4 and 5,
995 // the segment being pointed to by "BegSegment".
996 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
997 AliMUONHitForRec *extrapHitForRec, *hit;
998 AliMUONTrack *recTrack;
1000 if (fPrintLevel >= 1)
1001 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1002 // station for the end point
1003 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1004 // multiple scattering factor corresponding to one chamber
1005 mcsFactor = 0.0136 /
1006 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1007 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1008 // first and second chambers(0..) in the end station
1009 ch1 = 2 * endStation;
1011 // number of candidates to 0
1013 // Loop over chambers of the end station
1014 for (ch = ch2; ch >= ch1; ch--) {
1015 // linear extrapolation to chamber
1017 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1018 // limits for the hit index in the loop
1019 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1020 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1021 // Loop over HitForRec's in the chamber
1022 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1023 // pointer to HitForRec
1024 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1025 // test compatibility between current HitForRec and "extrapHitForRec"
1026 // 2 because 2 quantities in chi2
1028 NormalizedChi2WithHitForRec(extrapHitForRec,
1029 fMaxSigma2Distance)) <= 2.0) {
1030 // both HitForRec's compatible:
1031 // make track candidate from begSegment and current HitForRec
1032 if (fPrintLevel >= 2)
1033 cout << "TrackCandidate with HitForRec " << iHit <<
1034 " in Chamber(0..) " << ch << endl;
1035 // flag for beginning segments in one track:
1036 // to be done in track constructor ????
1037 BegSegment->SetInTrack(kTRUE);
1038 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1039 AliMUONTrack(BegSegment, hit, this);
1040 // the right place to eliminate "double counting" ???? how ????
1042 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1043 // increment number of track candidates
1046 } // for (iHit = iHitMin;...
1047 delete extrapHitForRec;
1048 } // for (ch = ch2;...
1049 return nbCan1Seg1Hit;
1052 //__________________________________________________________________________
1053 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1055 // To make track candidates
1056 // with at least 3 aligned points in stations(1..) 4 and 5
1057 // (two Segment's or one Segment and one HitForRec)
1058 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1059 AliMUONSegment *begSegment;
1060 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1061 // Loop over stations(1..) 5 and 4 for the beginning segment
1062 for (begStation = 4; begStation > 2; begStation--) {
1063 // Loop over segments in the beginning station
1064 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1065 // pointer to segment
1066 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1067 if (fPrintLevel >= 2)
1068 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1069 " in Station(0..) " << begStation << endl;
1070 // Look for track candidates with two segments,
1071 // "begSegment" and all compatible segments in other station.
1072 // Only for beginning station(1..) 5
1073 // because candidates with 2 segments have to looked for only once.
1074 if (begStation == 4)
1075 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1076 // Look for track candidates with one segment and one point,
1077 // "begSegment" and all compatible HitForRec's in other station.
1078 // Only if "begSegment" does not belong already to a track candidate.
1079 // Is that a too strong condition ????
1080 if (!(begSegment->GetInTrack()))
1081 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1082 } // for (iBegSegment = 0;...
1083 } // for (begStation = 4;...
1087 //__________________________________________________________________________
1088 void AliMUONEventReconstructor::FollowTracks(void)
1090 // Follow tracks in stations(1..) 3, 2 and 1
1091 // too long: should be made more modular !!!!
1092 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1093 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1094 AliMUONTrack *track, *nextTrack;
1095 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1096 // -1 to avoid compilation warnings
1097 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1098 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1099 Double_t bendingMomentum, chi2Norm = 0.;
1100 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1101 // local maxSigma2Distance, for easy increase in testing
1102 maxSigma2Distance = fMaxSigma2Distance;
1103 if (fPrintLevel >= 2)
1104 cout << "enter FollowTracks" << endl;
1105 // Loop over track candidates
1106 track = (AliMUONTrack*) fRecTracksPtr->First();
1109 // Follow function for each track candidate ????
1111 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1112 if (fPrintLevel >= 2)
1113 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1114 // Fit track candidate
1115 track->SetFitMCS(0); // without multiple Coulomb scattering
1116 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1117 track->SetFitStart(0); // from parameters at vertex
1119 if (fPrintLevel >= 10) {
1120 cout << "FollowTracks: track candidate(0..): " << trackIndex
1121 << " after fit in stations(0..) 3 and 4" << endl;
1122 track->RecursiveDump();
1124 // Loop over stations(1..) 3, 2 and 1
1125 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1126 // otherwise: majority coincidence 2 !!!!
1127 for (station = 2; station >= 0; station--) {
1128 // Track parameters at first track hit (smallest Z)
1129 trackParam1 = ((AliMUONTrackHit*)
1130 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1131 // extrapolation to station
1132 trackParam1->ExtrapToStation(station, trackParam);
1133 extrapSegment = new AliMUONSegment(); // empty segment
1134 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1135 // multiple scattering factor corresponding to one chamber
1136 // and momentum in bending plane (not total)
1137 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1138 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1139 // Z difference from previous station
1140 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1141 (&(pMUON->Chamber(2 * station + 2)))->Z();
1142 // Z difference between the two previous stations
1143 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1144 (&(pMUON->Chamber(2 * station + 4)))->Z();
1145 // Z difference between the two chambers in the previous station
1146 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1147 (&(pMUON->Chamber(2 * station + 1)))->Z();
1148 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1150 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1151 extrapSegment->UpdateFromStationTrackParam
1152 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1153 trackParam1->GetInverseBendingMomentum());
1154 // same thing for corrected segment
1155 // better to use copy constructor, after checking that it works properly !!!!
1156 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1158 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1159 extrapCorrSegment->UpdateFromStationTrackParam
1160 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1161 trackParam1->GetInverseBendingMomentum());
1164 if (fPrintLevel >= 10) {
1165 cout << "FollowTracks: track candidate(0..): " << trackIndex
1166 << " Look for segment in station(0..): " << station << endl;
1168 // Loop over segments in station
1169 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1170 // Look for best compatible Segment in station
1171 // should consider all possibilities ????
1172 // multiple scattering ????
1173 // separation in 2 functions: Segment and HitForRec ????
1174 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1175 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1176 // according to real Z value of "segment" and slopes of "extrapSegment"
1178 SetBendingCoor(extrapSegment->GetBendingCoor() +
1179 extrapSegment->GetBendingSlope() *
1180 (segment->GetHitForRec1()->GetZ() -
1181 (&(pMUON->Chamber(2 * station)))->Z()));
1183 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1184 extrapSegment->GetNonBendingSlope() *
1185 (segment->GetHitForRec1()->GetZ() -
1186 (&(pMUON->Chamber(2 * station)))->Z()));
1188 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1189 if (chi2 < bestChi2) {
1190 // update best Chi2 and Segment if better found
1191 bestSegment = segment;
1196 // best segment found: add it to track candidate
1197 track->AddSegment(bestSegment);
1198 // set track parameters at these two TrakHit's
1199 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1200 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1201 if (fPrintLevel >= 10) {
1202 cout << "FollowTracks: track candidate(0..): " << trackIndex
1203 << " Added segment in station(0..): " << station << endl;
1204 track->RecursiveDump();
1208 // No best segment found:
1209 // Look for best compatible HitForRec in station:
1210 // should consider all possibilities ????
1211 // multiple scattering ???? do about like for extrapSegment !!!!
1212 extrapHit = new AliMUONHitForRec(); // empty hit
1213 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1216 if (fPrintLevel >= 10) {
1217 cout << "FollowTracks: track candidate(0..): " << trackIndex
1218 << " Segment not found, look for hit in station(0..): " << station
1221 // Loop over chambers of the station
1222 for (chInStation = 0; chInStation < 2; chInStation++) {
1223 // coordinates of extrapolated hit
1225 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1227 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1228 // resolutions from "extrapSegment"
1229 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1230 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1231 // same things for corrected hit
1232 // better to use copy constructor, after checking that it works properly !!!!
1234 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1236 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1237 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1238 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1239 // Loop over hits in the chamber
1240 ch = 2 * station + chInStation;
1241 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1242 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1243 fNHitsForRecPerChamber[ch];
1245 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1246 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1247 // according to real Z value of "hit" and slopes of right "trackParam"
1249 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1250 (&(trackParam[chInStation]))->GetBendingSlope() *
1252 (&(trackParam[chInStation]))->GetZ()));
1254 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1255 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1257 (&(trackParam[chInStation]))->GetZ()));
1258 // condition for hit not already in segment ????
1259 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1260 if (chi2 < bestChi2) {
1261 // update best Chi2 and HitForRec if better found
1264 chBestHit = chInStation;
1269 // best hit found: add it to track candidate
1270 track->AddHitForRec(bestHit);
1271 // set track parameters at this TrackHit
1272 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1273 &(trackParam[chBestHit]));
1274 if (fPrintLevel >= 10) {
1275 cout << "FollowTracks: track candidate(0..): " << trackIndex
1276 << " Added hit in station(0..): " << station << endl;
1277 track->RecursiveDump();
1281 // Remove current track candidate
1282 // and corresponding TrackHit's, ...
1284 delete extrapSegment;
1285 delete extrapCorrSegment;
1287 delete extrapCorrHit;
1288 break; // stop the search for this candidate:
1289 // exit from the loop over station
1292 delete extrapCorrHit;
1294 delete extrapSegment;
1295 delete extrapCorrSegment;
1296 // Sort track hits according to increasing Z
1297 track->GetTrackHitsPtr()->Sort();
1298 // Update track parameters at first track hit (smallest Z)
1299 trackParam1 = ((AliMUONTrackHit*)
1300 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1301 bendingMomentum = 0.;
1302 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1303 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1304 // Track removed if bendingMomentum not in window [min, max]
1305 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1307 break; // stop the search for this candidate:
1308 // exit from the loop over station
1311 // with multiple Coulomb scattering if all stations
1312 if (station == 0) track->SetFitMCS(1);
1313 // without multiple Coulomb scattering if not all stations
1314 else track->SetFitMCS(0);
1315 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1316 track->SetFitStart(1); // from parameters at first hit
1318 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1319 if (numberOfDegFree > 0) {
1320 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1324 // Track removed if normalized chi2 too high
1325 if (chi2Norm > fMaxChi2) {
1327 break; // stop the search for this candidate:
1328 // exit from the loop over station
1330 if (fPrintLevel >= 10) {
1331 cout << "FollowTracks: track candidate(0..): " << trackIndex
1332 << " after fit from station(0..): " << station << " to 4" << endl;
1333 track->RecursiveDump();
1335 // Track extrapolation to the vertex through the absorber (Branson)
1336 // after going through the first station
1338 trackParamVertex = *trackParam1;
1339 (&trackParamVertex)->ExtrapToVertex();
1340 track->SetTrackParamAtVertex(&trackParamVertex);
1341 if (fPrintLevel >= 1) {
1342 cout << "FollowTracks: track candidate(0..): " << trackIndex
1343 << " after extrapolation to vertex" << endl;
1344 track->RecursiveDump();
1347 } // for (station = 2;...
1348 // go really to next track
1351 // Compression of track array (necessary after Remove ????)
1352 fRecTracksPtr->Compress();
1356 //__________________________________________________________________________
1357 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1359 // To remove double tracks.
1360 // Tracks are considered identical
1361 // if they have at least half of their hits in common.
1362 // Among two identical tracks, one keeps the track with the larger number of hits
1363 // or, if these numbers are equal, the track with the minimum Chi2.
1364 AliMUONTrack *track1, *track2, *trackToRemove;
1365 Bool_t identicalTracks;
1366 Int_t hitsInCommon, nHits1, nHits2;
1367 identicalTracks = kTRUE;
1368 while (identicalTracks) {
1369 identicalTracks = kFALSE;
1370 // Loop over first track of the pair
1371 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1372 while (track1 && (!identicalTracks)) {
1373 nHits1 = track1->GetNTrackHits();
1374 // Loop over second track of the pair
1375 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1376 while (track2 && (!identicalTracks)) {
1377 nHits2 = track2->GetNTrackHits();
1378 // number of hits in common between two tracks
1379 hitsInCommon = track1->HitsInCommon(track2);
1380 // check for identical tracks
1381 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1382 identicalTracks = kTRUE;
1383 // decide which track to remove
1384 if (nHits1 > nHits2) trackToRemove = track2;
1385 else if (nHits1 < nHits2) trackToRemove = track1;
1386 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1387 trackToRemove = track2;
1388 else trackToRemove = track1;
1390 trackToRemove->Remove();
1392 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1394 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1400 //__________________________________________________________________________
1401 void AliMUONEventReconstructor::EventDump(void)
1403 // Dump reconstructed event (track parameters at vertex and at first hit),
1404 // and the particle parameters
1406 AliMUONTrack *track;
1407 AliMUONTrackParam *trackParam, *trackParam1;
1408 Double_t bendingSlope, nonBendingSlope, pYZ;
1409 Double_t pX, pY, pZ, x, y, z, c;
1410 Int_t np, trackIndex, nTrackHits;
1412 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1413 if (fPrintLevel >= 1) {
1414 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1416 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1417 // Loop over reconstructed tracks
1418 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1419 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1420 if (fPrintLevel >= 1)
1421 cout << " track number: " << trackIndex << endl;
1422 // function for each track for modularity ????
1423 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1424 nTrackHits = track->GetNTrackHits();
1425 if (fPrintLevel >= 1)
1426 cout << " number of track hits: " << nTrackHits << endl;
1427 // track parameters at Vertex
1428 trackParam = track->GetTrackParamAtVertex();
1429 x = trackParam->GetNonBendingCoor();
1430 y = trackParam->GetBendingCoor();
1431 z = trackParam->GetZ();
1432 bendingSlope = trackParam->GetBendingSlope();
1433 nonBendingSlope = trackParam->GetNonBendingSlope();
1434 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1435 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1436 pX = pZ * nonBendingSlope;
1437 pY = pZ * bendingSlope;
1438 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1439 if (fPrintLevel >= 1)
1440 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1441 z, x, y, pX, pY, pZ, c);
1443 // track parameters at first hit
1444 trackParam1 = ((AliMUONTrackHit*)
1445 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1446 x = trackParam1->GetNonBendingCoor();
1447 y = trackParam1->GetBendingCoor();
1448 z = trackParam1->GetZ();
1449 bendingSlope = trackParam1->GetBendingSlope();
1450 nonBendingSlope = trackParam1->GetNonBendingSlope();
1451 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1452 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1453 pX = pZ * nonBendingSlope;
1454 pY = pZ * bendingSlope;
1455 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1456 if (fPrintLevel >= 1)
1457 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1458 z, x, y, pX, pY, pZ, c);
1460 // informations about generated particles
1461 np = gAlice->GetMCApp()->GetNtrack();
1462 printf(" **** number of generated particles: %d \n", np);
1464 // for (Int_t iPart = 0; iPart < np; iPart++) {
1465 // p = gAlice->Particle(iPart);
1466 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1467 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1472 void AliMUONEventReconstructor::FillEvent()
1474 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1475 // leaf in the Event branch of TreeRecoEvent tree
1476 cout << "Enter FillEvent() ...\n";
1479 fRecoEvent = new AliMUONRecoEvent();
1481 fRecoEvent->Clear();
1483 //save current directory
1484 TDirectory *current = gDirectory;
1485 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1486 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1487 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1488 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1489 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1490 TBranch *branch = fEventTree->GetBranch("Event");
1491 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1492 branch->SetAutoDelete();
1497 // restore directory
1501 //__________________________________________________________________________
1502 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1504 // To make initial tracks for Kalman filter from the list of segments
1506 AliMUONSegment *segment;
1507 AliMUONTrackK *trackK;
1509 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1510 // Reset the TClonesArray of reconstructed tracks
1511 if (fRecTracksPtr) fRecTracksPtr->Delete();
1512 // Delete in order that the Track destructors are called,
1513 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1516 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1517 // Loop over stations(1...) 5 and 4
1518 for (istat=4; istat>=3; istat--) {
1519 // Loop over segments in the station
1520 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1521 // Transform segments to tracks and evaluate covariance matrix
1522 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1523 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1525 } // for (iseg=0;...)
1526 } // for (istat=4;...)
1530 //__________________________________________________________________________
1531 void AliMUONEventReconstructor::FollowTracksK(void)
1533 // Follow tracks using Kalman filter
1535 Int_t icand, ichamBeg, ichamEnd, chamBits;
1536 Double_t zDipole1, zDipole2;
1537 AliMUONTrackK *trackK;
1538 AliMUONHitForRec *hit;
1539 AliMUONRawCluster *clus;
1540 TClonesArray *rawclusters;
1542 clus = 0; rawclusters = 0;
1544 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1545 zDipole2 = zDipole1 + GetSimpleBLength();
1548 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1549 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1550 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1551 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1553 cout << " Hit #" << hit->GetChamberNumber() << " ";
1554 cout << hit->GetBendingCoor() << " ";
1555 cout << hit->GetNonBendingCoor() << " ";
1556 cout << hit->GetZ() << " ";
1557 cout << hit->GetGeantSignal() << " ";
1558 cout << hit->GetTHTrack() << endl;
1561 printf(" Hit # %d %10.4f %10.4f %10.4f",
1562 hit->GetChamberNumber(), hit->GetBendingCoor(),
1563 hit->GetNonBendingCoor(), hit->GetZ());
1564 if (fRecGeantHits) {
1566 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1568 // from raw clusters
1569 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1570 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1572 printf("%3d", clus->fTracks[1]-1);
1573 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1580 Int_t nSeeds = fNRecTracks; // starting number of seeds
1581 // Loop over track candidates
1582 while (icand < fNRecTracks-1) {
1584 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1586 // Discard candidate which will produce the double track
1588 Ok = CheckCandidateK(icand,nSeeds);
1590 //trackK->SetRecover(-1); // mark candidate to be removed
1596 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1597 trackK->GetHitOnTrack()->Last(); // last hit
1598 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1599 ichamBeg = hit->GetChamberNumber();
1601 // Check propagation direction
1602 if (trackK->GetTrackDir() > 0) {
1603 ichamEnd = 9; // forward propagation
1604 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1606 ichamBeg = ichamEnd;
1607 ichamEnd = 6; // backward propagation
1608 // Change weight matrix and zero fChi2 for backpropagation
1609 trackK->StartBack();
1610 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1611 ichamBeg = ichamEnd;
1615 if (trackK->GetBPFlag()) {
1617 ichamEnd = 6; // backward propagation
1618 // Change weight matrix and zero fChi2 for backpropagation
1619 trackK->StartBack();
1620 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1621 ichamBeg = ichamEnd;
1627 trackK->SetTrackDir(-1);
1628 trackK->SetBPFlag(kFALSE);
1629 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1631 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1632 else trackK->SetRecover(-1); // mark candidate to be removed
1634 // Majority 3 of 4 in first 2 stations
1636 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1637 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1638 chamBits |= BIT(hit->GetChamberNumber()-1);
1640 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1641 //mark candidate to be removed
1644 for (Int_t i=0; i<fNRecTracks; i++) {
1645 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1646 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1649 // Compress TClonesArray
1650 fRecTracksPtr->Compress();
1651 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1655 //__________________________________________________________________________
1656 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1658 // Discards track candidate if it will produce the double track (having
1659 // the same seed segment hits as hits of a good track found before)
1660 AliMUONTrackK *track1, *track2;
1661 AliMUONHitForRec *hit1, *hit2, *hit;
1663 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1664 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1665 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1667 for (Int_t i=0; i<icand; i++) {
1668 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1669 //if (track2->GetRecover() < 0) continue;
1670 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1672 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1676 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1677 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1678 if (hit == hit1 || hit == hit2) {
1680 if (nSame == 2) return kFALSE;
1682 } // for (Int_t j=0;
1684 } // for (Int_t i=0;
1688 //__________________________________________________________________________
1689 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1691 // Removes double tracks (sharing more than half of their hits). Keeps
1692 // the track with higher quality
1693 AliMUONTrackK *track1, *track2, *trackToKill;
1695 // Sort tracks according to their quality
1696 fRecTracksPtr->Sort();
1698 // Loop over first track of the pair
1699 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1701 // Loop over second track of the pair
1702 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1704 // Check whether or not to keep track2
1705 if (!track2->KeepTrack(track1)) {
1706 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1707 " " << track2->GetTrackQuality() << endl;
1708 trackToKill = track2;
1709 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1710 trackToKill->Kill();
1711 fRecTracksPtr->Compress();
1712 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1714 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1717 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1718 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1721 //__________________________________________________________________________
1722 void AliMUONEventReconstructor::GoToVertex(void)
1724 // Propagates track to the vertex thru absorber
1725 // (using Branson correction for now)
1729 for (Int_t i=0; i<fNRecTracks; i++) {
1730 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1731 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1732 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1733 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber