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 ////////////////////////////////////
36 #include <Riostream.h>
37 #include <TDirectory.h>
39 #include <TMatrixD.h> //AZ
41 #include "AliMUONEventReconstructor.h"
43 #include "AliMUONConstants.h"
44 #include "AliMUONHit.h"
45 #include "AliMUONHitForRec.h"
46 #include "AliMUONTriggerTrack.h"
47 #include "AliMUONTriggerCircuit.h"
48 #include "AliMUONRawCluster.h"
49 #include "AliMUONLocalTrigger.h"
50 #include "AliMUONGlobalTrigger.h"
51 #include "AliMUONRecoEvent.h"
52 #include "AliMUONSegment.h"
53 #include "AliMUONTrack.h"
54 #include "AliMUONTrackHit.h"
56 #include "AliRun.h" // for gAlice
57 #include "AliRunLoader.h"
58 #include "AliLoader.h"
59 #include "AliMUONTrackK.h" //AZ
62 #include "AliTrackReference.h"
64 //************* Defaults parameters for reconstruction
65 const Double_t AliMUONEventReconstructor::fgkDefaultMinBendingMomentum = 3.0;
66 const Double_t AliMUONEventReconstructor::fgkDefaultMaxBendingMomentum = 500.0;
67 const Double_t AliMUONEventReconstructor::fgkDefaultMaxChi2 = 100.0;
68 const Double_t AliMUONEventReconstructor::fgkDefaultMaxSigma2Distance = 16.0;
69 const Double_t AliMUONEventReconstructor::fgkDefaultBendingResolution = 0.01;
70 const Double_t AliMUONEventReconstructor::fgkDefaultNonBendingResolution = 0.144;
71 const Double_t AliMUONEventReconstructor::fgkDefaultChamberThicknessInX0 = 0.03;
72 // Simple magnetic field:
73 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
74 // Length and Position from reco_muon.F, with opposite sign:
75 // Length = ZMAGEND-ZCOIL
76 // Position = (ZMAGEND+ZCOIL)/2
77 // to be ajusted differently from real magnetic field ????
78 const Double_t AliMUONEventReconstructor::fgkDefaultSimpleBValue = 7.0;
79 const Double_t AliMUONEventReconstructor::fgkDefaultSimpleBLength = 428.0;
80 const Double_t AliMUONEventReconstructor::fgkDefaultSimpleBPosition = 1019.0;
81 const Int_t AliMUONEventReconstructor::fgkDefaultRecTrackRefHits = 0;
82 const Double_t AliMUONEventReconstructor::fgkDefaultEfficiency = 0.95;
84 const Int_t AliMUONEventReconstructor::fgkDefaultPrintLevel = -1;
86 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
88 //__________________________________________________________________________
89 AliMUONEventReconstructor::AliMUONEventReconstructor(AliLoader* loader)
92 // Constructor for class AliMUONEventReconstructor
93 SetReconstructionParametersToDefaults();
94 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
95 // Memory allocation for the TClonesArray of hits for reconstruction
96 // Is 10000 the right size ????
97 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
98 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
99 // Memory allocation for the TClonesArray's of segments in stations
100 // Is 2000 the right size ????
101 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
102 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
103 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
105 // Memory allocation for the TClonesArray of reconstructed tracks
106 // Is 10 the right size ????
107 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
108 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
110 fRecTriggerTracksPtr = new TClonesArray("AliMUONTriggerTrack", 10);
111 fNRecTriggerTracks = 0; // really needed or GetEntriesFast sufficient ????
112 // Memory allocation for the TClonesArray of hits on reconstructed tracks
113 // Is 100 the right size ????
114 //AZ fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
115 fRecTrackHitsPtr = new TClonesArray("AliMUONTrackHit", 100);
116 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
118 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
120 x[0] = 50.; x[1] = 50.; x[2] = -950.;
121 gAlice->Field()->Field(x, b);
122 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
123 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
124 // See how to get fSimple(BValue, BLength, BPosition)
125 // automatically calculated from the actual magnetic field ????
127 if (fPrintLevel >= 0) {
128 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
129 cout << endl << "Magnetic field from root file:" << endl;
130 gAlice->Field()->Dump();
134 // Initializions for track ref. background events
135 fBkgTrackRefFile = 0;
137 fBkgTrackRefParticles = 0;
139 fBkgTrackRefEventNumber = -1;
141 // Initialize to 0 pointers to RecoEvent, tree and tree file
146 // initialize loader's
149 // initialize container
150 fMUONData = new AliMUONData(fLoader,"MUON","MUON");
154 //__________________________________________________________________________
155 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& rhs)
158 // Protected copy constructor
160 AliFatal("Not implemented.");
163 AliMUONEventReconstructor &
164 AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& rhs)
166 // Protected assignement operator
168 if (this == &rhs) return *this;
170 AliFatal("Not implemented.");
175 //__________________________________________________________________________
176 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
178 // Destructor for class AliMUONEventReconstructor
183 // if (fEventTree) delete fEventTree;
184 if (fRecoEvent) delete fRecoEvent;
185 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
186 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
187 delete fSegmentsPtr[st]; // Correct destruction of everything ????
191 //__________________________________________________________________________
192 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
194 // Set reconstruction parameters to default values
195 // Would be much more convenient with a structure (or class) ????
196 fMinBendingMomentum = fgkDefaultMinBendingMomentum;
197 fMaxBendingMomentum = fgkDefaultMaxBendingMomentum;
198 fMaxChi2 = fgkDefaultMaxChi2;
199 fMaxSigma2Distance = fgkDefaultMaxSigma2Distance;
201 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
202 // ******** Parameters for making HitsForRec
204 // like in TRACKF_STAT:
205 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
206 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
207 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
208 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
209 2.0 * TMath::Pi() / 180.0;
210 else fRMin[ch] = 30.0;
211 // maximum radius at 10 degrees and Z of chamber
212 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
213 10.0 * TMath::Pi() / 180.0;
216 // ******** Parameters for making segments
217 // should be parametrized ????
218 // according to interval between chambers in a station ????
219 // Maximum distance in non bending plane
220 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
222 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
223 fSegmentMaxDistNonBending[st] = 5. * 0.22;
224 // Maximum distance in bending plane:
225 // values from TRACKF_STAT, corresponding to (J psi 20cm),
226 // scaled to the real distance between chambers in a station
227 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
228 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
229 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
230 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
231 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
232 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
233 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
234 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
235 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
236 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
238 fBendingResolution = fgkDefaultBendingResolution;
239 fNonBendingResolution = fgkDefaultNonBendingResolution;
240 fChamberThicknessInX0 = fgkDefaultChamberThicknessInX0;
241 fSimpleBValue = fgkDefaultSimpleBValue;
242 fSimpleBLength = fgkDefaultSimpleBLength;
243 fSimpleBPosition = fgkDefaultSimpleBPosition;
244 fRecTrackRefHits = fgkDefaultRecTrackRefHits;
245 fEfficiency = fgkDefaultEfficiency;
246 fPrintLevel = fgkDefaultPrintLevel;
250 //__________________________________________________________________________
251 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
253 // Returns impact parameter at vertex in bending plane (cm),
254 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
255 // using simple values for dipole magnetic field.
256 // The sign of "BendingMomentum" is the sign of the charge.
257 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
261 //__________________________________________________________________________
262 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
264 // Returns signed bending momentum in bending plane (GeV/c),
265 // the sign being the sign of the charge for particles moving forward in Z,
266 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
267 // using simple values for dipole magnetic field.
268 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
272 //__________________________________________________________________________
273 void AliMUONEventReconstructor::SetBkgTrackRefFile(Text_t *BkgTrackRefFileName)
275 // Set background file ... for track ref. hits
276 // Must be called after having loaded the firts signal event
277 if (fPrintLevel >= 0) {
278 cout << "Enter SetBkgTrackRefFile with BkgTrackRefFileName ``"
279 << BkgTrackRefFileName << "''" << endl;}
280 if (strlen(BkgTrackRefFileName)) {
281 // BkgTrackRefFileName not empty: try to open the file
282 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
283 fBkgTrackRefFile = new TFile(BkgTrackRefFileName);
284 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
285 if (fBkgTrackRefFile-> IsOpen()) {
286 if (fPrintLevel >= 0) {
287 cout << "Background for Track ref. hits in file: ``" << BkgTrackRefFileName
288 << "'' successfully opened" << endl;}
291 cout << "Background for Track Ref. hits in file: " << BkgTrackRefFileName << endl;
292 cout << "NOT FOUND: EXIT" << endl;
293 exit(0); // right instruction for exit ????
295 // Arrays for "particles" and "hits"
296 fBkgTrackRefParticles = new TClonesArray("TParticle", 200);
297 // Event number to -1 for initialization
298 fBkgTrackRefEventNumber = -1;
299 // Back to the signal file:
300 // first signal event must have been loaded previously,
301 // otherwise, Segmentation violation at the next instruction
302 // How is it possible to do smething better ????
303 ((gAlice->TreeK())->GetCurrentFile())->cd();
304 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
309 //__________________________________________________________________________
310 void AliMUONEventReconstructor::NextBkgTrackRefEvent(void)
312 // Get next event in background file for track ref. hits
313 // Goes back to event number 0 when end of file is reached
315 if (fPrintLevel >= 0) {
316 cout << "Enter NextBkgTrackRefEvent" << endl;}
317 // Clean previous event
318 if(fBkgTrackRefTK) delete fBkgTrackRefTK;
319 fBkgTrackRefTK = NULL;
320 if(fBkgTrackRefParticles) fBkgTrackRefParticles->Clear();
321 if(fBkgTrackRefTTR) delete fBkgTrackRefTTR;
322 fBkgTrackRefTTR = NULL;
323 // Increment event number
324 fBkgTrackRefEventNumber++;
325 // Get access to Particles and Hits for event from background file
326 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
327 fBkgTrackRefFile->cd();
328 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
329 // Particles: TreeK for event and branch "Particles"
330 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
331 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
332 if (!fBkgTrackRefTK) {
333 if (fPrintLevel >= 0) {
334 cout << "Cannot find Kine Tree for background event: " <<
335 fBkgTrackRefEventNumber << endl;
336 cout << "Goes back to event 0" << endl;
338 fBkgTrackRefEventNumber = 0;
339 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
340 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
341 if (!fBkgTrackRefTK) {
342 AliError(Form("cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber));
347 fBkgTrackRefTK->SetBranchAddress("Particles", &fBkgTrackRefParticles);
348 fBkgTrackRefTK->GetEvent(0); // why event 0 ???? necessary ????
349 // Hits: TreeH for event and branch "MUON"
350 sprintf(treeName, "TreeTR%d", fBkgTrackRefEventNumber);
351 fBkgTrackRefTTR = (TTree*)gDirectory->Get(treeName);
352 if (!fBkgTrackRefTTR) {
353 AliError(Form("cannot find Hits Tree for background event: %d",fBkgTrackRefEventNumber));
356 fBkgTrackRefTTR->GetEntries(); // necessary ????
357 // Back to the signal file
358 ((gAlice->TreeK())->GetCurrentFile())->cd();
359 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
363 //__________________________________________________________________________
364 void AliMUONEventReconstructor::EventReconstruct(void)
366 // To reconstruct one event
367 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
368 MakeEventToBeReconstructed();
371 if (fMUONData->IsTriggerTrackBranchesInTree())
372 ValidateTracksWithTrigger();
374 // Add tracks to MUON data container
375 for(Int_t i=0; i<GetNRecTracks(); i++) {
376 AliMUONTrack * track = (AliMUONTrack*) GetRecTracksPtr()->At(i);
377 fMUONData->AddRecTrack(*track);
383 //__________________________________________________________________________
384 void AliMUONEventReconstructor::EventReconstructTrigger(void)
386 // To reconstruct one event
387 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
392 //__________________________________________________________________________
393 void AliMUONEventReconstructor::ResetHitsForRec(void)
395 // To reset the array and the number of HitsForRec,
396 // and also the number of HitsForRec
397 // and the index of the first HitForRec per chamber
398 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
400 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++)
401 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
405 //__________________________________________________________________________
406 void AliMUONEventReconstructor::ResetSegments(void)
408 // To reset the TClonesArray of segments and the number of Segments
410 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
411 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
417 //__________________________________________________________________________
418 void AliMUONEventReconstructor::ResetTracks(void)
420 // To reset the TClonesArray of reconstructed tracks
421 if (fRecTracksPtr) fRecTracksPtr->Delete();
422 // Delete in order that the Track destructors are called,
423 // hence the space for the TClonesArray of pointers to TrackHit's is freed
428 //__________________________________________________________________________
429 void AliMUONEventReconstructor::ResetTriggerTracks(void)
431 // To reset the TClonesArray of reconstructed trigger tracks
432 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
433 // Delete in order that the Track destructors are called,
434 // hence the space for the TClonesArray of pointers to TrackHit's is freed
435 fNRecTriggerTracks = 0;
439 //__________________________________________________________________________
440 void AliMUONEventReconstructor::ResetTrackHits(void)
442 // To reset the TClonesArray of hits on reconstructed tracks
443 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
448 //__________________________________________________________________________
449 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
451 // To make the list of hits to be reconstructed,
452 // either from the track ref. hits or from the raw clusters
453 // according to the parameter set for the reconstructor
454 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
456 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
459 // Error("MakeEventToBeReconstructed",
460 // "Can not find Run Loader in Event Folder named %s.",
461 // evfoldname.Data());
464 // AliLoader* gime = rl->GetLoader("MUONLoader");
467 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
470 AliRunLoader *runLoader = fLoader->GetRunLoader();
472 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
474 if (fRecTrackRefHits == 1) {
475 // Reconstruction from track ref. hits
476 // Back to the signal file
477 TTree* treeTR = runLoader->TreeTR();
480 Int_t retval = runLoader->LoadTrackRefs("READ");
483 AliError("Error occured while loading hits.");
486 treeTR = runLoader->TreeTR();
489 AliError("Can not get TreeTR");
494 AddHitsForRecFromTrackRef(treeTR,1);
497 AddHitsForRecFromTrackRef(fBkgTrackRefTTR,0);
498 // Sort HitsForRec in increasing order with respect to chamber number
499 SortHitsForRecWithIncreasingChamber();
502 // Reconstruction from raw clusters
503 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
504 // Security on MUON ????
505 // TreeR assumed to be be "prepared" in calling function
506 // by "MUON->GetTreeR(nev)" ????
507 TTree *treeR = fLoader->TreeR();
508 fMUONData->SetTreeAddress("RC");
509 AddHitsForRecFromRawClusters(treeR);
510 // No sorting: it is done automatically in the previous function
512 if (fPrintLevel >= 10) {
513 cout << "end of MakeEventToBeReconstructed" << endl;
514 cout << "NHitsForRec: " << fNHitsForRec << endl;
515 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
516 cout << "chamber(0...): " << ch
517 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
518 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
520 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
521 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
523 cout << "HitForRec index(0...): " << hit << endl;
524 ((*fHitsForRecPtr)[hit])->Dump();
531 //__________________________________________________________________________
532 void AliMUONEventReconstructor::AddHitsForRecFromTrackRef(TTree *TTR, Int_t signal)
534 // To add to the list of hits for reconstruction
535 // the signal hits from a track reference tree TreeTR.
536 TClonesArray *listOfTrackRefs = NULL;
537 AliTrackReference *trackRef;
540 if (fPrintLevel >= 2)
541 cout << "enter AddHitsForRecFromTrackRef with TTR: " << TTR << endl;
542 if (TTR == NULL) return;
544 listOfTrackRefs = CleanTrackRefs(TTR);
546 Int_t ntracks = listOfTrackRefs->GetEntriesFast();
548 if (fPrintLevel >= 2)
549 cout << "ntracks: " << ntracks << endl;
551 for (Int_t index = 0; index < ntracks; index++) {
552 trackRef = (AliTrackReference*) listOfTrackRefs->At(index);
553 track = trackRef->GetTrack();
555 NewHitForRecFromTrackRef(trackRef,track,signal);
556 } // end of track ref.
558 listOfTrackRefs->Delete();
559 delete listOfTrackRefs;
564 //__________________________________________________________________________
565 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromTrackRef(AliTrackReference* Hit, Int_t TrackNumber, Int_t Signal)
567 // To make a new hit for reconstruction from a track ref. hit pointed to by "Hit",
568 // with the track numbered "TrackNumber",
569 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
570 // Selects hits in tracking (not trigger) chambers.
571 // Takes into account the efficiency (fEfficiency)
572 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
573 // Adds a condition on the radius between RMin and RMax
574 // to better simulate the real chambers.
575 // Returns the pointer to the new hit for reconstruction,
576 // or NULL in case of inefficiency or non tracking chamber or bad radius.
577 // No condition on at most 20 cm from a muon from a resonance
578 // like in Fortran TRACKF_STAT.
579 AliMUONHitForRec* hitForRec;
580 Double_t bendCoor, nonBendCoor, radius;
581 Int_t chamber = AliMUONConstants::ChamberNumber(Hit->Z()); // chamber(0...)
582 if (chamber < 0) return NULL;
583 // only in tracking chambers (fChamber starts at 1)
584 if (chamber >= fgkMaxMuonTrackingChambers) return NULL;
585 // only if hit is efficient (keep track for checking ????)
586 if (gRandom->Rndm() > fEfficiency) return NULL;
587 // only if radius between RMin and RMax
589 nonBendCoor = Hit->X();
590 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
591 // This cut is not needed with a realistic chamber geometry !!!!
592 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
593 // new AliMUONHitForRec from track ref. hit and increment number of AliMUONHitForRec's
594 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
596 // add smearing from resolution
597 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
598 hitForRec->SetNonBendingCoor(nonBendCoor
599 + gRandom->Gaus(0., fNonBendingResolution));
600 // // !!!! without smearing
601 // hitForRec->SetBendingCoor(bendCoor);
602 // hitForRec->SetNonBendingCoor(nonBendCoor);
603 // more information into HitForRec
604 // resolution: angular effect to be added here ????
605 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
606 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
608 hitForRec->SetTTRTrack(TrackNumber);
609 hitForRec->SetTrackRefSignal(Signal);
610 if (fPrintLevel >= 10) {
611 cout << "track: " << TrackNumber << endl;
613 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
617 //__________________________________________________________________________
618 TClonesArray* AliMUONEventReconstructor::CleanTrackRefs(TTree *treeTR)
620 // Make hits from track ref..
621 // Re-calculate hits parameters because two AliTrackReferences are recorded for
622 // each chamber (one when particle is entering + one when particle is leaving
623 // the sensitive volume)
625 AliTrackReference *trackReference;
626 Float_t x1, y1, z1, pX1, pY1, pZ1;
627 Float_t x2, y2, z2, pX2, pY2, pZ2;
628 Int_t track1, track2;
630 Float_t maxGasGap = 1.; // cm
634 AliTrackReference *trackReferenceNew = new AliTrackReference();
636 TClonesArray* trackRefs = new TClonesArray("AliTrackReference", 10);
637 TClonesArray* cleanTrackRefs = new TClonesArray("AliTrackReference", 10);
639 if (treeTR == NULL) return NULL;
640 TBranch* branch = treeTR->GetBranch("MUON");
641 if (branch == NULL) return NULL;
642 branch->SetAddress(&trackRefs);
644 Int_t nTrack = (Int_t)treeTR->GetEntries();
645 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
646 treeTR->GetEntry(iTrack);
649 while (iHit1 < trackRefs->GetEntries()) {
650 trackReference = (AliTrackReference*)trackRefs->At(iHit1);
651 x1 = trackReference->X();
652 y1 = trackReference->Y();
653 z1 = trackReference->Z();
654 pX1 = trackReference->Px();
655 pY1 = trackReference->Py();
656 pZ1 = trackReference->Pz();
657 track1 = trackReference->GetTrack();
660 for (Int_t iHit2 = iHit1+1; iHit2 < trackRefs->GetEntries(); iHit2++) {
661 trackReference = (AliTrackReference*)trackRefs->At(iHit2);
662 x2 = trackReference->X();
663 y2 = trackReference->Y();
664 z2 = trackReference->Z();
665 pX2 = trackReference->Px();
666 pY2 = trackReference->Py();
667 pZ2 = trackReference->Pz();
668 track2 = trackReference->GetTrack();
669 if (track2 == track1 && TMath::Abs(z2-z1) < maxGasGap ) {
684 pX1 /= (Float_t)nRec;
685 pY1 /= (Float_t)nRec;
686 pZ1 /= (Float_t)nRec;
687 trackReferenceNew->SetPosition(x1,y1,z1);
688 trackReferenceNew->SetMomentum(pX1,pY1,pZ1);
689 trackReferenceNew->SetTrack(track1);
690 {new ((*cleanTrackRefs)[cleanTrackRefs->GetEntriesFast()]) AliTrackReference(*trackReferenceNew);}
697 delete trackReferenceNew;
698 return cleanTrackRefs;
701 //__________________________________________________________________________
702 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
704 // Sort HitsForRec's in increasing order with respect to chamber number.
705 // Uses the function "Compare".
706 // Update the information for HitsForRec per chamber too.
707 Int_t ch, nhits, prevch;
708 fHitsForRecPtr->Sort();
709 for (ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
710 fNHitsForRecPerChamber[ch] = 0;
711 fIndexOfFirstHitForRecPerChamber[ch] = 0;
713 prevch = 0; // previous chamber
714 nhits = 0; // number of hits in current chamber
715 // Loop over HitsForRec
716 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
717 // chamber number (0...)
718 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
719 // increment number of hits in current chamber
720 (fNHitsForRecPerChamber[ch])++;
721 // update index of first HitForRec in current chamber
722 // if chamber number different from previous one
724 fIndexOfFirstHitForRecPerChamber[ch] = hit;
731 // //__________________________________________________________________________
732 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
734 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
735 // // To add to the list of hits for reconstruction
736 // // the (cathode correlated) raw clusters
737 // // No condition added, like in Fortran TRACKF_STAT,
738 // // on the radius between RMin and RMax.
739 // AliMUONHitForRec *hitForRec;
740 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
741 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
742 // // Security on MUON ????
743 // // Loop over tracking chambers
744 // for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
745 // // number of HitsForRec to 0 for the chamber
746 // fNHitsForRecPerChamber[ch] = 0;
747 // // index of first HitForRec for the chamber
748 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
749 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
750 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
751 // MUON->ResetReconstHits();
753 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
754 // // Loop over (cathode correlated) raw clusters
755 // for (Int_t cor = 0; cor < ncor; cor++) {
756 // AliMUONReconstHit * mCor =
757 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
758 // // new AliMUONHitForRec from (cathode correlated) raw cluster
759 // // and increment number of AliMUONHitForRec's (total and in chamber)
760 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
762 // (fNHitsForRecPerChamber[ch])++;
763 // // more information into HitForRec
764 // hitForRec->SetChamberNumber(ch);
765 // hitForRec->SetHitNumber(cor);
766 // // Z coordinate of the chamber (cm) with sign opposite to TRACKREF sign
767 // // could (should) be more exact from chamber geometry ????
768 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
769 // if (fPrintLevel >= 10) {
770 // cout << "chamber (0...): " << ch <<
771 // " cathcorrel (0...): " << cor << endl;
773 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
774 // hitForRec->Dump();}
775 // } // end of cluster loop
776 // } // end of chamber loop
780 //__________________________________________________________________________
781 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
783 // To add to the list of hits for reconstruction all the raw clusters
784 // No condition added, like in Fortran TRACKF_STAT,
785 // on the radius between RMin and RMax.
786 AliMUONHitForRec *hitForRec;
787 AliMUONRawCluster *clus;
788 Int_t iclus, nclus, nTRentries;
789 TClonesArray *rawclusters;
790 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
792 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
793 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
796 // Error("MakeEventToBeReconstructed",
797 // "Can not find Run Loader in Event Folder named %s.",
798 // evfoldname.Data());
801 // AliLoader* gime = rl->GetLoader("MUONLoader");
804 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
807 // // Loading AliRun master
809 // gAlice = rl->GetAliRun();
811 // Loading MUON subsystem
812 // AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
814 nTRentries = Int_t(TR->GetEntries());
815 if (nTRentries != 1) {
816 AliError(Form("nTRentries = %d not equal to 1 ",nTRentries));
819 fLoader->TreeR()->GetEvent(0); // only one entry
821 // Loop over tracking chambers
822 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
823 // number of HitsForRec to 0 for the chamber
824 fNHitsForRecPerChamber[ch] = 0;
825 // index of first HitForRec for the chamber
826 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
827 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
828 rawclusters =fMUONData->RawClusters(ch);
829 // pMUON->ResetRawClusters();
830 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
831 nclus = (Int_t) (rawclusters->GetEntries());
832 // Loop over (cathode correlated) raw clusters
833 for (iclus = 0; iclus < nclus; iclus++) {
834 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
835 // new AliMUONHitForRec from raw cluster
836 // and increment number of AliMUONHitForRec's (total and in chamber)
837 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
839 (fNHitsForRecPerChamber[ch])++;
840 // more information into HitForRec
841 // resolution: info should be already in raw cluster and taken from it ????
842 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
843 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
844 // original raw cluster
845 hitForRec->SetChamberNumber(ch);
846 hitForRec->SetHitNumber(iclus);
847 // Z coordinate of the raw cluster (cm)
848 hitForRec->SetZ(clus->GetZ(0));
849 if (fPrintLevel >= 10) {
850 cout << "chamber (0...): " << ch <<
851 " raw cluster (0...): " << iclus << endl;
853 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
855 } // end of cluster loop
856 } // end of chamber loop
857 SortHitsForRecWithIncreasingChamber(); //AZ
861 //__________________________________________________________________________
862 void AliMUONEventReconstructor::MakeSegments(void)
864 // To make the list of segments in all stations,
865 // from the list of hits to be reconstructed
866 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
868 // Loop over stations
869 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
870 //AZ for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
871 for (Int_t st = nb; st < fgkMaxMuonTrackingStations; st++) //AZ
872 MakeSegmentsPerStation(st);
873 if (fPrintLevel >= 10) {
874 cout << "end of MakeSegments" << endl;
875 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
876 cout << "station(0...): " << st
877 << " Segments: " << fNSegments[st]
880 seg < fNSegments[st];
882 cout << "Segment index(0...): " << seg << endl;
883 ((*fSegmentsPtr[st])[seg])->Dump();
890 //__________________________________________________________________________
891 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
893 // To make the list of segments in station number "Station" (0...)
894 // from the list of hits to be reconstructed.
895 // Updates "fNSegments"[Station].
896 // Segments in stations 4 and 5 are sorted
897 // according to increasing absolute value of "impact parameter"
898 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
899 AliMUONSegment *segment;
901 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
902 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
903 if (fPrintLevel >= 1)
904 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
905 // first and second chambers (0...) in the station
906 Int_t ch1 = 2 * Station;
908 // variable true for stations downstream of the dipole:
909 // Station(0..4) equal to 3 or 4
910 if ((Station == 3) || (Station == 4)) {
912 // maximum impact parameter (cm) according to fMinBendingMomentum...
914 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
915 // minimum impact parameter (cm) according to fMaxBendingMomentum...
917 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
919 else last2st = kFALSE;
920 // extrapolation factor from Z of first chamber to Z of second chamber
921 // dZ to be changed to take into account fine structure of chambers ????
923 // index for current segment
924 Int_t segmentIndex = 0;
925 // Loop over HitsForRec in the first chamber of the station
926 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
927 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
929 // pointer to the HitForRec
930 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
932 // on the straight line joining the HitForRec to the vertex (0,0,0),
933 // to the Z of the second chamber of the station
934 // Loop over HitsForRec in the second chamber of the station
935 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
936 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
938 // pointer to the HitForRec
939 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
940 // absolute values of distances, in bending and non bending planes,
941 // between the HitForRec in the second chamber
942 // and the previous extrapolation
943 extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ();
944 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
945 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
946 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
947 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
950 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
951 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
952 // absolute value of impact parameter
954 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
956 // check for distances not too large,
957 // and impact parameter not too big if stations downstream of the dipole.
958 // Conditions "distBend" and "impactParam" correlated for these stations ????
959 if ((distBend < fSegmentMaxDistBending[Station]) &&
960 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
961 (!last2st || (impactParam < maxImpactParam)) &&
962 (!last2st || (impactParam > minImpactParam))) {
964 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
965 AliMUONSegment(hit1Ptr, hit2Ptr);
966 // update "link" to this segment from the hit in the first chamber
967 if (hit1Ptr->GetNSegments() == 0)
968 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
969 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
970 if (fPrintLevel >= 10) {
971 cout << "segmentIndex(0...): " << segmentIndex
972 << " distBend: " << distBend
973 << " distNonBend: " << distNonBend
976 cout << "HitForRec in first chamber" << endl;
978 cout << "HitForRec in second chamber" << endl;
981 // increment index for current segment
985 } // for (Int_t hit1...
986 fNSegments[Station] = segmentIndex;
987 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
988 // i.e. Station(0..4) 3 or 4, using the function "Compare".
989 // After this sorting, it is impossible to use
990 // the "fNSegments" and "fIndexOfFirstSegment"
991 // of the HitForRec in the first chamber to explore all segments formed with it.
992 // Is this sorting really needed ????
993 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
994 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
995 << fNSegments[Station] << endl;
999 //__________________________________________________________________________
1000 void AliMUONEventReconstructor::MakeTracks(void)
1002 // To make the tracks,
1003 // from the list of segments and points in all stations
1004 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
1005 // The order may be important for the following Reset's
1008 if (fTrackMethod == 2) { //AZ - Kalman filter
1009 MakeTrackCandidatesK();
1010 if (fRecTracksPtr->GetEntriesFast() == 0) return;
1011 // Follow tracks in stations(1..) 3, 2 and 1
1013 // Remove double tracks
1014 RemoveDoubleTracksK();
1015 // Propagate tracks to the vertex thru absorber
1017 // Fill AliMUONTrack data members
1020 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
1021 MakeTrackCandidates();
1022 // Follow tracks in stations(1..) 3, 2 and 1
1024 // Remove double tracks
1025 RemoveDoubleTracks();
1026 UpdateTrackParamAtHit();
1027 UpdateHitForRecAtHit();
1032 //__________________________________________________________________________
1033 void AliMUONEventReconstructor::ValidateTracksWithTrigger(void)
1035 // Try to match track from tracking system with trigger track
1036 AliMUONTrack *track;
1037 TClonesArray *recTriggerTracks;
1039 fMUONData->ResetRecTriggerTracks();
1040 fMUONData->SetTreeAddress("RL");
1041 fMUONData->GetRecTriggerTracks();
1042 recTriggerTracks = fMUONData->RecTriggerTracks();
1044 track = (AliMUONTrack*) fRecTracksPtr->First();
1046 track->MatchTriggerTrack(recTriggerTracks);
1047 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1052 //__________________________________________________________________________
1053 Bool_t AliMUONEventReconstructor::MakeTriggerTracks(void)
1055 // To make the trigger tracks from Local Trigger
1056 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
1057 // ResetTriggerTracks();
1061 TClonesArray *localTrigger;
1062 TClonesArray *globalTrigger;
1063 AliMUONLocalTrigger *locTrg;
1064 AliMUONGlobalTrigger *gloTrg;
1065 AliMUONTriggerCircuit *circuit;
1066 AliMUONTriggerTrack *recTriggerTrack = 0;
1068 TTree* treeR = fLoader->TreeR();
1070 // Loading MUON subsystem
1071 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1073 nTRentries = Int_t(treeR->GetEntries());
1075 treeR->GetEvent(0); // only one entry
1077 if (!(fMUONData->IsTriggerBranchesInTree())) {
1078 AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries));
1082 fMUONData->SetTreeAddress("TC");
1083 fMUONData->GetTrigger();
1085 // global trigger for trigger pattern
1087 globalTrigger = fMUONData->GlobalTrigger();
1088 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1090 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1091 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1092 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1094 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1095 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1096 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1098 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1099 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1100 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1102 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1103 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1104 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1106 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1107 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1108 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1113 // local trigger for tracking
1114 localTrigger = fMUONData->LocalTrigger();
1115 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1116 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1117 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1119 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1120 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1121 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1122 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1123 Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
1124 Float_t y21 = circuit->GetY21Pos(stripX21);
1125 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1126 Float_t thetax = TMath::ATan2( x11 , z11 );
1127 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1129 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1130 // since static statement does not work, set gloTrigPat for each track
1132 // fNRecTriggerTracks++;
1133 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
1134 } // end of loop on Local Trigger
1138 //__________________________________________________________________________
1139 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1141 // To make track candidates with two segments in stations(1..) 4 and 5,
1142 // the first segment being pointed to by "BegSegment".
1143 // Returns the number of such track candidates.
1144 Int_t endStation, iEndSegment, nbCan2Seg;
1145 AliMUONSegment *endSegment;
1146 AliMUONSegment *extrapSegment = NULL;
1147 AliMUONTrack *recTrack;
1149 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1150 // Station for the end segment
1151 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1152 // multiple scattering factor corresponding to one chamber
1153 mcsFactor = 0.0136 /
1154 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1155 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1156 // linear extrapolation to end station
1157 // number of candidates with 2 segments to 0
1159 // Loop over segments in the end station
1160 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1161 // pointer to segment
1162 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1163 // test compatibility between current segment and "extrapSegment"
1164 // 4 because 4 quantities in chi2
1166 BegSegment->CreateSegmentFromLinearExtrapToStation(endSegment->GetZ(), mcsFactor);
1168 NormalizedChi2WithSegment(extrapSegment,
1169 fMaxSigma2Distance)) <= 4.0) {
1170 // both segments compatible:
1171 // make track candidate from "begSegment" and "endSegment"
1172 if (fPrintLevel >= 2)
1173 cout << "TrackCandidate with Segment " << iEndSegment <<
1174 " in Station(0..) " << endStation << endl;
1175 // flag for both segments in one track:
1176 // to be done in track constructor ????
1177 BegSegment->SetInTrack(kTRUE);
1178 endSegment->SetInTrack(kTRUE);
1179 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1180 AliMUONTrack(BegSegment, endSegment, this);
1182 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1183 // increment number of track candidates with 2 segments
1186 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1187 } // for (iEndSegment = 0;...
1191 //__________________________________________________________________________
1192 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1194 // To make track candidates with one segment and one point
1195 // in stations(1..) 4 and 5,
1196 // the segment being pointed to by "BegSegment".
1197 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1198 AliMUONHitForRec *extrapHitForRec= NULL;
1199 AliMUONHitForRec *hit;
1200 AliMUONTrack *recTrack;
1202 if (fPrintLevel >= 1)
1203 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1204 // station for the end point
1205 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1206 // multiple scattering factor corresponding to one chamber
1207 mcsFactor = 0.0136 /
1208 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1209 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1210 // first and second chambers(0..) in the end station
1211 ch1 = 2 * endStation;
1213 // number of candidates to 0
1215 // Loop over chambers of the end station
1216 for (ch = ch2; ch >= ch1; ch--) {
1217 // limits for the hit index in the loop
1218 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1219 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1220 // Loop over HitForRec's in the chamber
1221 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1222 // pointer to HitForRec
1223 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1224 // test compatibility between current HitForRec and "extrapHitForRec"
1225 // 2 because 2 quantities in chi2
1226 // linear extrapolation to chamber
1228 BegSegment->CreateHitForRecFromLinearExtrapToChamber( hit->GetZ(), mcsFactor);
1230 NormalizedChi2WithHitForRec(extrapHitForRec,
1231 fMaxSigma2Distance)) <= 2.0) {
1232 // both HitForRec's compatible:
1233 // make track candidate from begSegment and current HitForRec
1234 if (fPrintLevel >= 2)
1235 cout << "TrackCandidate with HitForRec " << iHit <<
1236 " in Chamber(0..) " << ch << endl;
1237 // flag for beginning segments in one track:
1238 // to be done in track constructor ????
1239 BegSegment->SetInTrack(kTRUE);
1240 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1241 AliMUONTrack(BegSegment, hit, this);
1242 // the right place to eliminate "double counting" ???? how ????
1244 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1245 // increment number of track candidates
1248 delete extrapHitForRec;
1249 } // for (iHit = iHitMin;...
1250 } // for (ch = ch2;...
1251 return nbCan1Seg1Hit;
1254 //__________________________________________________________________________
1255 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1257 // To make track candidates
1258 // with at least 3 aligned points in stations(1..) 4 and 5
1259 // (two Segment's or one Segment and one HitForRec)
1260 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1261 AliMUONSegment *begSegment;
1262 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1263 // Loop over stations(1..) 5 and 4 for the beginning segment
1264 for (begStation = 4; begStation > 2; begStation--) {
1265 // Loop over segments in the beginning station
1266 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1267 // pointer to segment
1268 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1269 if (fPrintLevel >= 2)
1270 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1271 " in Station(0..) " << begStation << endl;
1272 // Look for track candidates with two segments,
1273 // "begSegment" and all compatible segments in other station.
1274 // Only for beginning station(1..) 5
1275 // because candidates with 2 segments have to looked for only once.
1276 if (begStation == 4)
1277 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1278 // Look for track candidates with one segment and one point,
1279 // "begSegment" and all compatible HitForRec's in other station.
1280 // Only if "begSegment" does not belong already to a track candidate.
1281 // Is that a too strong condition ????
1282 if (!(begSegment->GetInTrack()))
1283 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1284 } // for (iBegSegment = 0;...
1285 } // for (begStation = 4;...
1289 //__________________________________________________________________________
1290 void AliMUONEventReconstructor::FollowTracks(void)
1292 // Follow tracks in stations(1..) 3, 2 and 1
1293 // too long: should be made more modular !!!!
1294 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1295 AliMUONSegment *bestSegment, *extrapSegment, *segment;
1296 AliMUONTrack *track, *nextTrack;
1297 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1298 // -1 to avoid compilation warnings
1299 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1300 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1301 Double_t bendingMomentum, chi2Norm = 0.;
1302 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1303 // local maxSigma2Distance, for easy increase in testing
1304 maxSigma2Distance = fMaxSigma2Distance;
1305 if (fPrintLevel >= 2)
1306 cout << "enter FollowTracks" << endl;
1307 // Loop over track candidates
1308 track = (AliMUONTrack*) fRecTracksPtr->First();
1311 // Follow function for each track candidate ????
1313 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1314 if (fPrintLevel >= 2)
1315 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1316 // Fit track candidate
1317 track->SetFitMCS(0); // without multiple Coulomb scattering
1318 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1319 track->SetFitStart(0); // from parameters at vertex
1321 if (fPrintLevel >= 10) {
1322 cout << "FollowTracks: track candidate(0..): " << trackIndex
1323 << " after fit in stations(0..) 3 and 4" << endl;
1324 track->RecursiveDump();
1326 // Loop over stations(1..) 3, 2 and 1
1327 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1328 // otherwise: majority coincidence 2 !!!!
1329 for (station = 2; station >= 0; station--) {
1330 // Track parameters at first track hit (smallest Z)
1331 trackParam1 = ((AliMUONTrackHit*)
1332 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1333 // extrapolation to station
1334 trackParam1->ExtrapToStation(station, trackParam);
1335 extrapSegment = new AliMUONSegment(); // empty segment
1336 // multiple scattering factor corresponding to one chamber
1337 // and momentum in bending plane (not total)
1338 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1339 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1340 // Z difference from previous station
1341 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1342 (&(pMUON->Chamber(2 * station + 2)))->Z();
1343 // Z difference between the two previous stations
1344 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1345 (&(pMUON->Chamber(2 * station + 4)))->Z();
1346 // Z difference between the two chambers in the previous station
1347 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1348 (&(pMUON->Chamber(2 * station + 1)))->Z();
1349 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1351 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1352 extrapSegment->UpdateFromStationTrackParam
1353 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1354 trackParam1->GetInverseBendingMomentum());
1357 if (fPrintLevel >= 10) {
1358 cout << "FollowTracks: track candidate(0..): " << trackIndex
1359 << " Look for segment in station(0..): " << station << endl;
1361 // Loop over segments in station
1362 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1363 // Look for best compatible Segment in station
1364 // should consider all possibilities ????
1365 // multiple scattering ????
1366 // separation in 2 functions: Segment and HitForRec ????
1367 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1368 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1369 // according to real Z value of "segment" and slopes of "extrapSegment"
1370 (&(trackParam[0]))->ExtrapToZ(segment->GetZ());
1371 (&(trackParam[1]))->ExtrapToZ(segment->GetZ());
1372 extrapSegment->SetBendingCoor((&(trackParam[0]))->GetBendingCoor());
1373 extrapSegment->SetNonBendingCoor((&(trackParam[0]))->GetNonBendingCoor());
1374 extrapSegment->SetBendingSlope((&(trackParam[0]))->GetBendingSlope());
1375 extrapSegment->SetNonBendingSlope((&(trackParam[0]))->GetNonBendingSlope());
1377 NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1378 if (chi2 < bestChi2) {
1379 // update best Chi2 and Segment if better found
1380 bestSegment = segment;
1385 // best segment found: add it to track candidate
1386 (&(trackParam[0]))->ExtrapToZ(bestSegment->GetZ());
1387 (&(trackParam[1]))->ExtrapToZ(bestSegment->GetZ());
1388 track->AddSegment(bestSegment);
1389 // set track parameters at these two TrakHit's
1390 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1391 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1392 if (fPrintLevel >= 10) {
1393 cout << "FollowTracks: track candidate(0..): " << trackIndex
1394 << " Added segment in station(0..): " << station << endl;
1395 track->RecursiveDump();
1399 // No best segment found:
1400 // Look for best compatible HitForRec in station:
1401 // should consider all possibilities ????
1402 // multiple scattering ???? do about like for extrapSegment !!!!
1403 extrapHit = new AliMUONHitForRec(); // empty hit
1406 if (fPrintLevel >= 10) {
1407 cout << "FollowTracks: track candidate(0..): " << trackIndex
1408 << " Segment not found, look for hit in station(0..): " << station
1411 // Loop over chambers of the station
1412 for (chInStation = 0; chInStation < 2; chInStation++) {
1413 ch = 2 * station + chInStation;
1414 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1415 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1416 fNHitsForRecPerChamber[ch];
1418 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1419 // coordinates of extrapolated hit
1420 (&(trackParam[chInStation]))->ExtrapToZ(hit->GetZ());
1422 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1424 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1425 // resolutions from "extrapSegment"
1426 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1427 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1428 // Loop over hits in the chamber
1429 // condition for hit not already in segment ????
1430 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1431 if (chi2 < bestChi2) {
1432 // update best Chi2 and HitForRec if better found
1435 chBestHit = chInStation;
1440 // best hit found: add it to track candidate
1441 (&(trackParam[chBestHit]))->ExtrapToZ(bestHit->GetZ());
1442 track->AddHitForRec(bestHit);
1443 // set track parameters at this TrackHit
1444 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1445 &(trackParam[chBestHit]));
1446 if (fPrintLevel >= 10) {
1447 cout << "FollowTracks: track candidate(0..): " << trackIndex
1448 << " Added hit in station(0..): " << station << endl;
1449 track->RecursiveDump();
1453 // Remove current track candidate
1454 // and corresponding TrackHit's, ...
1456 delete extrapSegment;
1458 break; // stop the search for this candidate:
1459 // exit from the loop over station
1463 delete extrapSegment;
1464 // Sort track hits according to increasing Z
1465 track->GetTrackHitsPtr()->Sort();
1466 // Update track parameters at first track hit (smallest Z)
1467 trackParam1 = ((AliMUONTrackHit*)
1468 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1469 bendingMomentum = 0.;
1470 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1471 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1472 // Track removed if bendingMomentum not in window [min, max]
1473 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1475 break; // stop the search for this candidate:
1476 // exit from the loop over station
1479 // with multiple Coulomb scattering if all stations
1480 if (station == 0) track->SetFitMCS(1);
1481 // without multiple Coulomb scattering if not all stations
1482 else track->SetFitMCS(0);
1483 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1484 track->SetFitStart(1); // from parameters at first hit
1486 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1487 if (numberOfDegFree > 0) {
1488 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1492 // Track removed if normalized chi2 too high
1493 if (chi2Norm > fMaxChi2) {
1495 break; // stop the search for this candidate:
1496 // exit from the loop over station
1498 if (fPrintLevel >= 10) {
1499 cout << "FollowTracks: track candidate(0..): " << trackIndex
1500 << " after fit from station(0..): " << station << " to 4" << endl;
1501 track->RecursiveDump();
1503 // Track extrapolation to the vertex through the absorber (Branson)
1504 // after going through the first station
1506 trackParamVertex = *trackParam1;
1507 (&trackParamVertex)->ExtrapToVertex(0.,0.,0.);
1508 track->SetTrackParamAtVertex(&trackParamVertex);
1509 if (fPrintLevel >= 1) {
1510 cout << "FollowTracks: track candidate(0..): " << trackIndex
1511 << " after extrapolation to vertex" << endl;
1512 track->RecursiveDump();
1515 } // for (station = 2;...
1516 // go really to next track
1519 // Compression of track array (necessary after Remove ????)
1520 fRecTracksPtr->Compress();
1524 //__________________________________________________________________________
1525 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1527 // To remove double tracks.
1528 // Tracks are considered identical
1529 // if they have at least half of their hits in common.
1530 // Among two identical tracks, one keeps the track with the larger number of hits
1531 // or, if these numbers are equal, the track with the minimum Chi2.
1532 AliMUONTrack *track1, *track2, *trackToRemove;
1533 Bool_t identicalTracks;
1534 Int_t hitsInCommon, nHits1, nHits2;
1535 identicalTracks = kTRUE;
1536 while (identicalTracks) {
1537 identicalTracks = kFALSE;
1538 // Loop over first track of the pair
1539 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1540 while (track1 && (!identicalTracks)) {
1541 nHits1 = track1->GetNTrackHits();
1542 // Loop over second track of the pair
1543 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1544 while (track2 && (!identicalTracks)) {
1545 nHits2 = track2->GetNTrackHits();
1546 // number of hits in common between two tracks
1547 hitsInCommon = track1->HitsInCommon(track2);
1548 // check for identical tracks
1549 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1550 identicalTracks = kTRUE;
1551 // decide which track to remove
1552 if (nHits1 > nHits2) trackToRemove = track2;
1553 else if (nHits1 < nHits2) trackToRemove = track1;
1554 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1555 trackToRemove = track2;
1556 else trackToRemove = track1;
1558 trackToRemove->Remove();
1560 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1562 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1568 //__________________________________________________________________________
1569 void AliMUONEventReconstructor::UpdateTrackParamAtHit()
1571 // Set track parameters after track fitting. Fill fTrackParamAtHit of AliMUONTrack's
1572 AliMUONTrack *track;
1573 AliMUONTrackHit *trackHit;
1574 AliMUONTrackParam *trackParam;
1575 track = (AliMUONTrack*) fRecTracksPtr->First();
1577 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1579 trackParam = trackHit->GetTrackParam();
1580 track->AddTrackParamAtHit(trackParam);
1581 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1583 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1588 //__________________________________________________________________________
1589 void AliMUONEventReconstructor::UpdateHitForRecAtHit()
1591 // Set cluster parameterss after track fitting. Fill fHitForRecAtHit of AliMUONTrack's
1592 AliMUONTrack *track;
1593 AliMUONTrackHit *trackHit;
1594 AliMUONHitForRec *hitForRec;
1595 track = (AliMUONTrack*) fRecTracksPtr->First();
1597 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1599 hitForRec = trackHit->GetHitForRecPtr();
1600 track->AddHitForRecAtHit(hitForRec);
1601 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1603 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1608 //__________________________________________________________________________
1609 void AliMUONEventReconstructor::FillMUONTrack()
1611 // Set track parameters at hits for Kalman track. Fill fTrackParamAtHit of AliMUONTrack's
1612 AliMUONTrackK *track;
1613 track = (AliMUONTrackK*) fRecTracksPtr->First();
1615 track->FillMUONTrack();
1616 track = (AliMUONTrackK*) fRecTracksPtr->After(track);
1621 //__________________________________________________________________________
1622 void AliMUONEventReconstructor::EventDump(void)
1624 // Dump reconstructed event (track parameters at vertex and at first hit),
1625 // and the particle parameters
1627 AliMUONTrack *track;
1628 AliMUONTrackParam *trackParam, *trackParam1;
1629 Double_t bendingSlope, nonBendingSlope, pYZ;
1630 Double_t pX, pY, pZ, x, y, z, c;
1631 Int_t np, trackIndex, nTrackHits;
1633 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1634 if (fPrintLevel >= 1) {
1635 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1637 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1638 // Loop over reconstructed tracks
1639 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1640 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1641 if (fPrintLevel >= 1)
1642 cout << " track number: " << trackIndex << endl;
1643 // function for each track for modularity ????
1644 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1645 nTrackHits = track->GetNTrackHits();
1646 if (fPrintLevel >= 1)
1647 cout << " number of track hits: " << nTrackHits << endl;
1648 // track parameters at Vertex
1649 trackParam = track->GetTrackParamAtVertex();
1650 x = trackParam->GetNonBendingCoor();
1651 y = trackParam->GetBendingCoor();
1652 z = trackParam->GetZ();
1653 bendingSlope = trackParam->GetBendingSlope();
1654 nonBendingSlope = trackParam->GetNonBendingSlope();
1655 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1656 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1657 pX = pZ * nonBendingSlope;
1658 pY = pZ * bendingSlope;
1659 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1660 if (fPrintLevel >= 1)
1661 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1662 z, x, y, pX, pY, pZ, c);
1664 // track parameters at first hit
1665 trackParam1 = ((AliMUONTrackHit*)
1666 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1667 x = trackParam1->GetNonBendingCoor();
1668 y = trackParam1->GetBendingCoor();
1669 z = trackParam1->GetZ();
1670 bendingSlope = trackParam1->GetBendingSlope();
1671 nonBendingSlope = trackParam1->GetNonBendingSlope();
1672 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1673 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1674 pX = pZ * nonBendingSlope;
1675 pY = pZ * bendingSlope;
1676 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1677 if (fPrintLevel >= 1)
1678 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1679 z, x, y, pX, pY, pZ, c);
1681 // informations about generated particles
1682 np = gAlice->GetMCApp()->GetNtrack();
1683 printf(" **** number of generated particles: %d \n", np);
1685 // for (Int_t iPart = 0; iPart < np; iPart++) {
1686 // p = gAlice->Particle(iPart);
1687 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1688 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1694 //__________________________________________________________________________
1695 void AliMUONEventReconstructor::EventDumpTrigger(void)
1697 // Dump reconstructed trigger event
1698 // and the particle parameters
1700 AliMUONTriggerTrack *triggertrack ;
1701 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
1703 if (fPrintLevel >= 1) {
1704 cout << "****** enter EventDumpTrigger ******" << endl;
1705 cout << " Number of Reconstructed tracks :" << nTriggerTracks << endl;
1707 // Loop over reconstructed tracks
1708 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1709 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
1710 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1712 triggertrack->GetX11(),triggertrack->GetY11(),
1713 triggertrack->GetThetax(),triggertrack->GetThetay());
1717 //__________________________________________________________________________
1718 void AliMUONEventReconstructor::FillEvent()
1720 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1721 // leaf in the Event branch of TreeRecoEvent tree
1722 cout << "Enter FillEvent() ...\n";
1725 fRecoEvent = new AliMUONRecoEvent();
1727 fRecoEvent->Clear();
1729 //save current directory
1730 TDirectory *current = gDirectory;
1731 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1732 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1733 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1734 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1735 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1736 TBranch *branch = fEventTree->GetBranch("Event");
1737 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1738 branch->SetAutoDelete();
1743 // restore directory
1747 //__________________________________________________________________________
1748 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1750 // To make initial tracks for Kalman filter from the list of segments
1752 AliMUONSegment *segment;
1753 AliMUONTrackK *trackK;
1755 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1756 // Reset the TClonesArray of reconstructed tracks
1757 if (fRecTracksPtr) fRecTracksPtr->Delete();
1758 // Delete in order that the Track destructors are called,
1759 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1762 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1763 // Loop over stations(1...) 5 and 4
1764 for (istat=4; istat>=3; istat--) {
1765 // Loop over segments in the station
1766 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1767 // Transform segments to tracks and evaluate covariance matrix
1768 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1769 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1771 } // for (iseg=0;...)
1772 } // for (istat=4;...)
1776 //__________________________________________________________________________
1777 void AliMUONEventReconstructor::FollowTracksK(void)
1779 // Follow tracks using Kalman filter
1781 Int_t icand, ichamBeg = 0, ichamEnd, chamBits;
1782 Double_t zDipole1, zDipole2;
1783 AliMUONTrackK *trackK;
1784 AliMUONHitForRec *hit;
1785 AliMUONRawCluster *clus;
1786 TClonesArray *rawclusters;
1787 clus = 0; rawclusters = 0;
1789 //AZ(z->-z) zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1790 //AZ(z->-z) zDipole2 = zDipole1 + GetSimpleBLength();
1791 zDipole1 = GetSimpleBPosition() + GetSimpleBLength()/2;
1792 zDipole2 = zDipole1 - GetSimpleBLength();
1795 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[0]);
1796 if (trackK->DebugLevel() > 0) {
1797 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1798 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1799 //if (hit->GetTTRTrack() > 1 || hit->GetTrackRefSignal() == 0) continue;
1800 printf(" Hit # %d %10.4f %10.4f %10.4f",
1801 hit->GetChamberNumber(), hit->GetBendingCoor(),
1802 hit->GetNonBendingCoor(), hit->GetZ());
1803 if (fRecTrackRefHits) {
1804 // from track ref hits
1805 printf(" %3d %3d \n", hit->GetTrackRefSignal(), hit->GetTTRTrack());
1807 // from raw clusters
1808 rawclusters = fMUONData->RawClusters(hit->GetChamberNumber());
1809 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1811 printf("%3d", clus->GetTrack(1)-1);
1812 if (clus->GetTrack(2) != 0) printf("%3d \n", clus->GetTrack(2)-1);
1814 } // if (fRecTrackRefHits)
1816 } // if (trackK->DebugLevel() > 0)
1820 nSeeds = fNRecTracks; // starting number of seeds
1821 // Loop over track candidates
1822 while (icand < fNRecTracks-1) {
1824 if (trackK->DebugLevel()>0) cout << " *** Kalman track candidate No. " << icand << endl;
1825 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1826 if (trackK->GetRecover() < 0) continue; // failed track
1828 // Discard candidate which will produce the double track
1831 ok = CheckCandidateK(icand,nSeeds);
1833 trackK->SetRecover(-1); // mark candidate to be removed
1840 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1841 trackK->GetHitOnTrack()->Last(); // last hit
1842 //else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1843 else hit = trackK->GetHitLastOk(); // hit where track stopped
1844 if (hit) ichamBeg = hit->GetChamberNumber();
1846 // Check propagation direction
1847 if (hit == NULL) ichamBeg = ichamEnd;
1848 //AZ(z->-z) else if (trackK->GetTrackDir() > 0) {
1849 else if (trackK->GetTrackDir() < 0) {
1850 ichamEnd = 9; // forward propagation
1851 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1853 ichamBeg = ichamEnd;
1854 ichamEnd = 6; // backward propagation
1855 // Change weight matrix and zero fChi2 for backpropagation
1856 trackK->StartBack();
1857 //AZ trackK->SetTrackDir(-1);
1858 trackK->SetTrackDir(1);
1859 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1860 ichamBeg = ichamEnd;
1864 if (trackK->GetBPFlag()) {
1866 ichamEnd = 6; // backward propagation
1867 // Change weight matrix and zero fChi2 for backpropagation
1868 trackK->StartBack();
1869 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1870 ichamBeg = ichamEnd;
1876 //AZ trackK->SetTrackDir(-1);
1877 trackK->SetTrackDir(1);
1878 trackK->SetBPFlag(kFALSE);
1879 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1881 if (!ok) { trackK->SetRecover(-1); continue; } // mark candidate to be removed
1884 if (trackK->GetRecover() >= 0) {
1885 ok = trackK->Smooth();
1886 if (!ok) trackK->SetRecover(-1); // mark candidate to be removed
1889 // Majority 3 of 4 in first 2 stations
1892 Double_t chi2_max = 0;
1893 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1894 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1895 chamBits |= BIT(hit->GetChamberNumber());
1896 if (trackK->GetChi2PerPoint(i) > chi2_max) chi2_max = trackK->GetChi2PerPoint(i);
1898 if (!((chamBits&3)==3 || (chamBits>>2&3)==3) && chi2_max > 25) {
1899 //trackK->Recover();
1900 trackK->SetRecover(-1); //mark candidate to be removed
1903 if (ok) trackK->SetTrackQuality(0); // compute "track quality"
1906 for (Int_t i=0; i<fNRecTracks; i++) {
1907 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1908 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1911 // Compress TClonesArray
1912 fRecTracksPtr->Compress();
1913 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1917 //__________________________________________________________________________
1918 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds) const
1920 // Discards track candidate if it will produce the double track (having
1921 // the same seed segment hits as hits of a good track found before)
1922 AliMUONTrackK *track1, *track2;
1923 AliMUONHitForRec *hit1, *hit2, *hit;
1925 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1926 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1927 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1929 for (Int_t i=0; i<icand; i++) {
1930 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1931 //if (track2->GetRecover() < 0) continue;
1932 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1934 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1938 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1939 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1940 if (hit == hit1 || hit == hit2) {
1942 if (nSame == 2) return kFALSE;
1944 } // for (Int_t j=0;
1946 } // for (Int_t i=0;
1950 //__________________________________________________________________________
1951 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1953 // Removes double tracks (sharing more than half of their hits). Keeps
1954 // the track with higher quality
1955 AliMUONTrackK *track1, *track2, *trackToKill;
1957 // Sort tracks according to their quality
1958 fRecTracksPtr->Sort();
1960 // Loop over first track of the pair
1961 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1962 Int_t debug = track1->DebugLevel();
1964 // Loop over second track of the pair
1965 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1967 // Check whether or not to keep track2
1968 if (!track2->KeepTrack(track1)) {
1969 if (debug >= 0) cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1970 " " << track2->GetTrackQuality() << endl;
1971 trackToKill = track2;
1972 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1973 trackToKill->Kill();
1974 fRecTracksPtr->Compress();
1975 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1977 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1980 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1981 if (debug >= 0) cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1984 //__________________________________________________________________________
1985 void AliMUONEventReconstructor::GoToVertex(void)
1987 // Propagates track to the vertex thru absorber
1988 // (using Branson correction for now)
1992 for (Int_t i=0; i<fNRecTracks; i++) {
1993 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1994 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1995 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1996 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(1); // with absorber
2000 //__________________________________________________________________________
2001 void AliMUONEventReconstructor::SetTrackMethod(Int_t iTrackMethod)
2003 // Set track method and recreate track container if necessary
2005 fTrackMethod = iTrackMethod == 2 ? 2 : 1;
2006 if (fTrackMethod == 2) {
2007 if (fRecTracksPtr) delete fRecTracksPtr;
2008 fRecTracksPtr = new TClonesArray("AliMUONTrackK", 10);
2009 cout << " *** Tracking with the Kalman filter *** " << endl;
2010 } else cout << " *** Traditional tracking *** " << endl;