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 "AliMUONHitForRec.h"
45 #include "AliMUONTriggerTrack.h"
46 #include "AliMUONTriggerCircuit.h"
47 #include "AliMUONRawCluster.h"
48 #include "AliMUONLocalTrigger.h"
49 #include "AliMUONGlobalTrigger.h"
50 #include "AliMUONRecoEvent.h"
51 #include "AliMUONSegment.h"
52 #include "AliMUONTrack.h"
53 #include "AliMUONTrackHit.h"
55 #include "AliRun.h" // for gAlice
56 #include "AliRunLoader.h"
57 #include "AliLoader.h"
58 #include "AliMUONTrackK.h" //AZ
61 #include "AliTrackReference.h"
63 //************* Defaults parameters for reconstruction
64 const Double_t AliMUONEventReconstructor::fgkDefaultMinBendingMomentum = 3.0;
65 const Double_t AliMUONEventReconstructor::fgkDefaultMaxBendingMomentum = 2000.0;
66 const Double_t AliMUONEventReconstructor::fgkDefaultMaxChi2 = 100.0;
67 const Double_t AliMUONEventReconstructor::fgkDefaultMaxSigma2Distance = 16.0;
68 const Double_t AliMUONEventReconstructor::fgkDefaultBendingResolution = 0.01;
69 const Double_t AliMUONEventReconstructor::fgkDefaultNonBendingResolution = 0.144;
70 const Double_t AliMUONEventReconstructor::fgkDefaultChamberThicknessInX0 = 0.03;
71 // Simple magnetic field:
72 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
73 // Length and Position from reco_muon.F, with opposite sign:
74 // Length = ZMAGEND-ZCOIL
75 // Position = (ZMAGEND+ZCOIL)/2
76 // to be ajusted differently from real magnetic field ????
77 const Double_t AliMUONEventReconstructor::fgkDefaultSimpleBValue = 7.0;
78 const Double_t AliMUONEventReconstructor::fgkDefaultSimpleBLength = 428.0;
79 const Double_t AliMUONEventReconstructor::fgkDefaultSimpleBPosition = 1019.0;
80 const Int_t AliMUONEventReconstructor::fgkDefaultRecTrackRefHits = 0;
81 const Double_t AliMUONEventReconstructor::fgkDefaultEfficiency = 0.95;
83 const Int_t AliMUONEventReconstructor::fgkDefaultPrintLevel = -1;
85 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
87 //__________________________________________________________________________
88 AliMUONEventReconstructor::AliMUONEventReconstructor(AliLoader* loader)
91 // Constructor for class AliMUONEventReconstructor
92 SetReconstructionParametersToDefaults();
93 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
94 // Memory allocation for the TClonesArray of hits for reconstruction
95 // Is 10000 the right size ????
96 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
97 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
98 // Memory allocation for the TClonesArray's of segments in stations
99 // Is 2000 the right size ????
100 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
101 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
102 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
104 // Memory allocation for the TClonesArray of reconstructed tracks
105 // Is 10 the right size ????
106 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
107 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
109 fRecTriggerTracksPtr = new TClonesArray("AliMUONTriggerTrack", 10);
110 fNRecTriggerTracks = 0; // really needed or GetEntriesFast sufficient ????
111 // Memory allocation for the TClonesArray of hits on reconstructed tracks
112 // Is 100 the right size ????
113 //AZ fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
114 fRecTrackHitsPtr = new TClonesArray("AliMUONTrackHit", 100);
115 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
117 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
119 x[0] = 50.; x[1] = 50.; x[2] = -950.;
120 gAlice->Field()->Field(x, b);
121 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
122 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
123 // See how to get fSimple(BValue, BLength, BPosition)
124 // automatically calculated from the actual magnetic field ????
126 if (fPrintLevel >= 0) {
127 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
128 cout << endl << "Magnetic field from root file:" << endl;
129 gAlice->Field()->Dump();
133 // Initializions for track ref. background events
134 fBkgTrackRefFile = 0;
136 fBkgTrackRefParticles = 0;
138 fBkgTrackRefEventNumber = -1;
140 // Initialize to 0 pointers to RecoEvent, tree and tree file
145 // initialize loader's
148 // initialize container
149 fMUONData = new AliMUONData(fLoader,"MUON","MUON");
153 //__________________________________________________________________________
154 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& rhs)
157 // Protected copy constructor
159 AliFatal("Not implemented.");
162 AliMUONEventReconstructor &
163 AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& rhs)
165 // Protected assignement operator
167 if (this == &rhs) return *this;
169 AliFatal("Not implemented.");
174 //__________________________________________________________________________
175 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
177 // Destructor for class AliMUONEventReconstructor
182 // if (fEventTree) delete fEventTree;
183 if (fRecoEvent) delete fRecoEvent;
184 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
185 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
186 delete fSegmentsPtr[st]; // Correct destruction of everything ????
190 //__________________________________________________________________________
191 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
193 // Set reconstruction parameters to default values
194 // Would be much more convenient with a structure (or class) ????
195 fMinBendingMomentum = fgkDefaultMinBendingMomentum;
196 fMaxBendingMomentum = fgkDefaultMaxBendingMomentum;
197 fMaxChi2 = fgkDefaultMaxChi2;
198 fMaxSigma2Distance = fgkDefaultMaxSigma2Distance;
200 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
201 // ******** Parameters for making HitsForRec
203 // like in TRACKF_STAT:
204 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
205 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
206 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
207 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
208 2.0 * TMath::Pi() / 180.0;
209 else fRMin[ch] = 30.0;
210 // maximum radius at 10 degrees and Z of chamber
211 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
212 10.0 * TMath::Pi() / 180.0;
215 // ******** Parameters for making segments
216 // should be parametrized ????
217 // according to interval between chambers in a station ????
218 // Maximum distance in non bending plane
219 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
221 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
222 fSegmentMaxDistNonBending[st] = 5. * 0.22;
223 // Maximum distance in bending plane:
224 // values from TRACKF_STAT, corresponding to (J psi 20cm),
225 // scaled to the real distance between chambers in a station
226 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
227 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
228 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
229 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
230 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
231 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
232 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
233 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
234 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
235 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
237 fBendingResolution = fgkDefaultBendingResolution;
238 fNonBendingResolution = fgkDefaultNonBendingResolution;
239 fChamberThicknessInX0 = fgkDefaultChamberThicknessInX0;
240 fSimpleBValue = fgkDefaultSimpleBValue;
241 fSimpleBLength = fgkDefaultSimpleBLength;
242 fSimpleBPosition = fgkDefaultSimpleBPosition;
243 fRecTrackRefHits = fgkDefaultRecTrackRefHits;
244 fEfficiency = fgkDefaultEfficiency;
245 fPrintLevel = fgkDefaultPrintLevel;
249 //__________________________________________________________________________
250 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
252 // Returns impact parameter at vertex in bending plane (cm),
253 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
254 // using simple values for dipole magnetic field.
255 // The sign of "BendingMomentum" is the sign of the charge.
256 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
260 //__________________________________________________________________________
261 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
263 // Returns signed bending momentum in bending plane (GeV/c),
264 // the sign being the sign of the charge for particles moving forward in Z,
265 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
266 // using simple values for dipole magnetic field.
267 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
271 //__________________________________________________________________________
272 void AliMUONEventReconstructor::SetBkgTrackRefFile(Text_t *BkgTrackRefFileName)
274 // Set background file ... for track ref. hits
275 // Must be called after having loaded the firts signal event
276 if (fPrintLevel >= 0) {
277 cout << "Enter SetBkgTrackRefFile with BkgTrackRefFileName ``"
278 << BkgTrackRefFileName << "''" << endl;}
279 if (strlen(BkgTrackRefFileName)) {
280 // BkgTrackRefFileName not empty: try to open the file
281 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
282 fBkgTrackRefFile = new TFile(BkgTrackRefFileName);
283 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
284 if (fBkgTrackRefFile-> IsOpen()) {
285 if (fPrintLevel >= 0) {
286 cout << "Background for Track ref. hits in file: ``" << BkgTrackRefFileName
287 << "'' successfully opened" << endl;}
290 cout << "Background for Track Ref. hits in file: " << BkgTrackRefFileName << endl;
291 cout << "NOT FOUND: EXIT" << endl;
292 exit(0); // right instruction for exit ????
294 // Arrays for "particles" and "hits"
295 fBkgTrackRefParticles = new TClonesArray("TParticle", 200);
296 // Event number to -1 for initialization
297 fBkgTrackRefEventNumber = -1;
298 // Back to the signal file:
299 // first signal event must have been loaded previously,
300 // otherwise, Segmentation violation at the next instruction
301 // How is it possible to do smething better ????
302 ((gAlice->TreeK())->GetCurrentFile())->cd();
303 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
308 //__________________________________________________________________________
309 void AliMUONEventReconstructor::NextBkgTrackRefEvent(void)
311 // Get next event in background file for track ref. hits
312 // Goes back to event number 0 when end of file is reached
314 if (fPrintLevel >= 0) {
315 cout << "Enter NextBkgTrackRefEvent" << endl;}
316 // Clean previous event
317 if(fBkgTrackRefTK) delete fBkgTrackRefTK;
318 fBkgTrackRefTK = NULL;
319 if(fBkgTrackRefParticles) fBkgTrackRefParticles->Clear();
320 if(fBkgTrackRefTTR) delete fBkgTrackRefTTR;
321 fBkgTrackRefTTR = NULL;
322 // Increment event number
323 fBkgTrackRefEventNumber++;
324 // Get access to Particles and Hits for event from background file
325 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
326 fBkgTrackRefFile->cd();
327 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
328 // Particles: TreeK for event and branch "Particles"
329 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
330 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
331 if (!fBkgTrackRefTK) {
332 if (fPrintLevel >= 0) {
333 cout << "Cannot find Kine Tree for background event: " <<
334 fBkgTrackRefEventNumber << endl;
335 cout << "Goes back to event 0" << endl;
337 fBkgTrackRefEventNumber = 0;
338 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
339 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
340 if (!fBkgTrackRefTK) {
341 AliError(Form("cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber));
346 fBkgTrackRefTK->SetBranchAddress("Particles", &fBkgTrackRefParticles);
347 fBkgTrackRefTK->GetEvent(0); // why event 0 ???? necessary ????
348 // Hits: TreeH for event and branch "MUON"
349 sprintf(treeName, "TreeTR%d", fBkgTrackRefEventNumber);
350 fBkgTrackRefTTR = (TTree*)gDirectory->Get(treeName);
351 if (!fBkgTrackRefTTR) {
352 AliError(Form("cannot find Hits Tree for background event: %d",fBkgTrackRefEventNumber));
355 fBkgTrackRefTTR->GetEntries(); // necessary ????
356 // Back to the signal file
357 ((gAlice->TreeK())->GetCurrentFile())->cd();
358 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
362 //__________________________________________________________________________
363 void AliMUONEventReconstructor::EventReconstruct(void)
365 // To reconstruct one event
366 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
367 MakeEventToBeReconstructed();
370 if (fMUONData->IsTriggerTrackBranchesInTree())
371 ValidateTracksWithTrigger();
373 // Add tracks to MUON data container
374 for(Int_t i=0; i<GetNRecTracks(); i++) {
375 AliMUONTrack * track = (AliMUONTrack*) GetRecTracksPtr()->At(i);
376 fMUONData->AddRecTrack(*track);
382 //__________________________________________________________________________
383 void AliMUONEventReconstructor::EventReconstructTrigger(void)
385 // To reconstruct one event
386 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
391 //__________________________________________________________________________
392 void AliMUONEventReconstructor::ResetHitsForRec(void)
394 // To reset the array and the number of HitsForRec,
395 // and also the number of HitsForRec
396 // and the index of the first HitForRec per chamber
397 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
399 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++)
400 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
404 //__________________________________________________________________________
405 void AliMUONEventReconstructor::ResetSegments(void)
407 // To reset the TClonesArray of segments and the number of Segments
409 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
410 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
416 //__________________________________________________________________________
417 void AliMUONEventReconstructor::ResetTracks(void)
419 // To reset the TClonesArray of reconstructed tracks
420 if (fRecTracksPtr) fRecTracksPtr->Delete();
421 // Delete in order that the Track destructors are called,
422 // hence the space for the TClonesArray of pointers to TrackHit's is freed
427 //__________________________________________________________________________
428 void AliMUONEventReconstructor::ResetTriggerTracks(void)
430 // To reset the TClonesArray of reconstructed trigger tracks
431 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
432 // Delete in order that the Track destructors are called,
433 // hence the space for the TClonesArray of pointers to TrackHit's is freed
434 fNRecTriggerTracks = 0;
438 //__________________________________________________________________________
439 void AliMUONEventReconstructor::ResetTrackHits(void)
441 // To reset the TClonesArray of hits on reconstructed tracks
442 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
447 //__________________________________________________________________________
448 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
450 // To make the list of hits to be reconstructed,
451 // either from the track ref. hits or from the raw clusters
452 // according to the parameter set for the reconstructor
453 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
455 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
458 // Error("MakeEventToBeReconstructed",
459 // "Can not find Run Loader in Event Folder named %s.",
460 // evfoldname.Data());
463 // AliLoader* gime = rl->GetLoader("MUONLoader");
466 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
469 AliRunLoader *runLoader = fLoader->GetRunLoader();
471 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
473 if (fRecTrackRefHits == 1) {
474 // Reconstruction from track ref. hits
475 // Back to the signal file
476 TTree* treeTR = runLoader->TreeTR();
479 Int_t retval = runLoader->LoadTrackRefs("READ");
482 AliError("Error occured while loading hits.");
485 treeTR = runLoader->TreeTR();
488 AliError("Can not get TreeTR");
493 AddHitsForRecFromTrackRef(treeTR,1);
496 AddHitsForRecFromTrackRef(fBkgTrackRefTTR,0);
497 // Sort HitsForRec in increasing order with respect to chamber number
498 SortHitsForRecWithIncreasingChamber();
501 // Reconstruction from raw clusters
502 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
503 // Security on MUON ????
504 // TreeR assumed to be be "prepared" in calling function
505 // by "MUON->GetTreeR(nev)" ????
506 TTree *treeR = fLoader->TreeR();
507 fMUONData->SetTreeAddress("RC");
508 AddHitsForRecFromRawClusters(treeR);
509 // No sorting: it is done automatically in the previous function
511 if (fPrintLevel >= 10) {
512 cout << "end of MakeEventToBeReconstructed" << endl;
513 cout << "NHitsForRec: " << fNHitsForRec << endl;
514 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
515 cout << "chamber(0...): " << ch
516 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
517 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
519 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
520 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
522 cout << "HitForRec index(0...): " << hit << endl;
523 ((*fHitsForRecPtr)[hit])->Dump();
530 //__________________________________________________________________________
531 void AliMUONEventReconstructor::AddHitsForRecFromTrackRef(TTree *TTR, Int_t signal)
533 // To add to the list of hits for reconstruction
534 // the signal hits from a track reference tree TreeTR.
535 TClonesArray *listOfTrackRefs = NULL;
536 AliTrackReference *trackRef;
539 if (fPrintLevel >= 2)
540 cout << "enter AddHitsForRecFromTrackRef with TTR: " << TTR << endl;
541 if (TTR == NULL) return;
543 listOfTrackRefs = CleanTrackRefs(TTR);
545 Int_t ntracks = listOfTrackRefs->GetEntriesFast();
547 if (fPrintLevel >= 2)
548 cout << "ntracks: " << ntracks << endl;
550 for (Int_t index = 0; index < ntracks; index++) {
551 trackRef = (AliTrackReference*) listOfTrackRefs->At(index);
552 track = trackRef->GetTrack();
554 NewHitForRecFromTrackRef(trackRef,track,signal);
555 } // end of track ref.
557 listOfTrackRefs->Delete();
558 delete listOfTrackRefs;
563 //__________________________________________________________________________
564 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromTrackRef(AliTrackReference* Hit, Int_t TrackNumber, Int_t Signal)
566 // To make a new hit for reconstruction from a track ref. hit pointed to by "Hit",
567 // with the track numbered "TrackNumber",
568 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
569 // Selects hits in tracking (not trigger) chambers.
570 // Takes into account the efficiency (fEfficiency)
571 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
572 // Adds a condition on the radius between RMin and RMax
573 // to better simulate the real chambers.
574 // Returns the pointer to the new hit for reconstruction,
575 // or NULL in case of inefficiency or non tracking chamber or bad radius.
576 // No condition on at most 20 cm from a muon from a resonance
577 // like in Fortran TRACKF_STAT.
578 AliMUONHitForRec* hitForRec;
579 Double_t bendCoor, nonBendCoor, radius;
580 Int_t chamber = AliMUONConstants::ChamberNumber(Hit->Z()); // chamber(0...)
581 if (chamber < 0) return NULL;
582 // only in tracking chambers (fChamber starts at 1)
583 if (chamber >= fgkMaxMuonTrackingChambers) return NULL;
584 // only if hit is efficient (keep track for checking ????)
585 if (gRandom->Rndm() > fEfficiency) return NULL;
586 // only if radius between RMin and RMax
588 nonBendCoor = Hit->X();
589 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
590 // This cut is not needed with a realistic chamber geometry !!!!
591 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
592 // new AliMUONHitForRec from track ref. hit and increment number of AliMUONHitForRec's
593 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
595 // add smearing from resolution
596 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
597 hitForRec->SetNonBendingCoor(nonBendCoor
598 + gRandom->Gaus(0., fNonBendingResolution));
599 // // !!!! without smearing
600 // hitForRec->SetBendingCoor(bendCoor);
601 // hitForRec->SetNonBendingCoor(nonBendCoor);
602 // more information into HitForRec
603 // resolution: angular effect to be added here ????
604 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
605 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
607 hitForRec->SetTTRTrack(TrackNumber);
608 hitForRec->SetTrackRefSignal(Signal);
609 if (fPrintLevel >= 10) {
610 cout << "track: " << TrackNumber << endl;
612 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
616 //__________________________________________________________________________
617 TClonesArray* AliMUONEventReconstructor::CleanTrackRefs(TTree *treeTR)
619 // Make hits from track ref..
620 // Re-calculate hits parameters because two AliTrackReferences are recorded for
621 // each chamber (one when particle is entering + one when particle is leaving
622 // the sensitive volume)
624 AliTrackReference *trackReference;
625 Float_t x1, y1, z1, pX1, pY1, pZ1;
626 Float_t x2, y2, z2, pX2, pY2, pZ2;
627 Int_t track1, track2;
629 Float_t maxGasGap = 1.; // cm
633 AliTrackReference *trackReferenceNew = new AliTrackReference();
635 TClonesArray* trackRefs = new TClonesArray("AliTrackReference", 10);
636 TClonesArray* cleanTrackRefs = new TClonesArray("AliTrackReference", 10);
638 if (treeTR == NULL) return NULL;
639 TBranch* branch = treeTR->GetBranch("MUON");
640 if (branch == NULL) return NULL;
641 branch->SetAddress(&trackRefs);
643 Int_t nTrack = (Int_t)treeTR->GetEntries();
644 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
645 treeTR->GetEntry(iTrack);
648 while (iHit1 < trackRefs->GetEntries()) {
649 trackReference = (AliTrackReference*)trackRefs->At(iHit1);
650 x1 = trackReference->X();
651 y1 = trackReference->Y();
652 z1 = trackReference->Z();
653 pX1 = trackReference->Px();
654 pY1 = trackReference->Py();
655 pZ1 = trackReference->Pz();
656 track1 = trackReference->GetTrack();
659 for (Int_t iHit2 = iHit1+1; iHit2 < trackRefs->GetEntries(); iHit2++) {
660 trackReference = (AliTrackReference*)trackRefs->At(iHit2);
661 x2 = trackReference->X();
662 y2 = trackReference->Y();
663 z2 = trackReference->Z();
664 pX2 = trackReference->Px();
665 pY2 = trackReference->Py();
666 pZ2 = trackReference->Pz();
667 track2 = trackReference->GetTrack();
668 if (track2 == track1 && TMath::Abs(z2-z1) < maxGasGap ) {
683 pX1 /= (Float_t)nRec;
684 pY1 /= (Float_t)nRec;
685 pZ1 /= (Float_t)nRec;
686 trackReferenceNew->SetPosition(x1,y1,z1);
687 trackReferenceNew->SetMomentum(pX1,pY1,pZ1);
688 trackReferenceNew->SetTrack(track1);
689 {new ((*cleanTrackRefs)[cleanTrackRefs->GetEntriesFast()]) AliTrackReference(*trackReferenceNew);}
696 delete trackReferenceNew;
697 return cleanTrackRefs;
700 //__________________________________________________________________________
701 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
703 // Sort HitsForRec's in increasing order with respect to chamber number.
704 // Uses the function "Compare".
705 // Update the information for HitsForRec per chamber too.
706 Int_t ch, nhits, prevch;
707 fHitsForRecPtr->Sort();
708 for (ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
709 fNHitsForRecPerChamber[ch] = 0;
710 fIndexOfFirstHitForRecPerChamber[ch] = 0;
712 prevch = 0; // previous chamber
713 nhits = 0; // number of hits in current chamber
714 // Loop over HitsForRec
715 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
716 // chamber number (0...)
717 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
718 // increment number of hits in current chamber
719 (fNHitsForRecPerChamber[ch])++;
720 // update index of first HitForRec in current chamber
721 // if chamber number different from previous one
723 fIndexOfFirstHitForRecPerChamber[ch] = hit;
730 // //__________________________________________________________________________
731 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
733 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
734 // // To add to the list of hits for reconstruction
735 // // the (cathode correlated) raw clusters
736 // // No condition added, like in Fortran TRACKF_STAT,
737 // // on the radius between RMin and RMax.
738 // AliMUONHitForRec *hitForRec;
739 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
740 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
741 // // Security on MUON ????
742 // // Loop over tracking chambers
743 // for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
744 // // number of HitsForRec to 0 for the chamber
745 // fNHitsForRecPerChamber[ch] = 0;
746 // // index of first HitForRec for the chamber
747 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
748 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
749 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
750 // MUON->ResetReconstHits();
752 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
753 // // Loop over (cathode correlated) raw clusters
754 // for (Int_t cor = 0; cor < ncor; cor++) {
755 // AliMUONReconstHit * mCor =
756 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
757 // // new AliMUONHitForRec from (cathode correlated) raw cluster
758 // // and increment number of AliMUONHitForRec's (total and in chamber)
759 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
761 // (fNHitsForRecPerChamber[ch])++;
762 // // more information into HitForRec
763 // hitForRec->SetChamberNumber(ch);
764 // hitForRec->SetHitNumber(cor);
765 // // Z coordinate of the chamber (cm) with sign opposite to TRACKREF sign
766 // // could (should) be more exact from chamber geometry ????
767 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
768 // if (fPrintLevel >= 10) {
769 // cout << "chamber (0...): " << ch <<
770 // " cathcorrel (0...): " << cor << endl;
772 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
773 // hitForRec->Dump();}
774 // } // end of cluster loop
775 // } // end of chamber loop
779 //__________________________________________________________________________
780 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
782 // To add to the list of hits for reconstruction all the raw clusters
783 // No condition added, like in Fortran TRACKF_STAT,
784 // on the radius between RMin and RMax.
785 AliMUONHitForRec *hitForRec;
786 AliMUONRawCluster *clus;
787 Int_t iclus, nclus, nTRentries;
788 TClonesArray *rawclusters;
789 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
791 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
792 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
795 // Error("MakeEventToBeReconstructed",
796 // "Can not find Run Loader in Event Folder named %s.",
797 // evfoldname.Data());
800 // AliLoader* gime = rl->GetLoader("MUONLoader");
803 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
806 // // Loading AliRun master
808 // gAlice = rl->GetAliRun();
810 // Loading MUON subsystem
811 // AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
813 nTRentries = Int_t(TR->GetEntries());
814 if (nTRentries != 1) {
815 AliError(Form("nTRentries = %d not equal to 1 ",nTRentries));
818 fLoader->TreeR()->GetEvent(0); // only one entry
820 // Loop over tracking chambers
821 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
822 // number of HitsForRec to 0 for the chamber
823 fNHitsForRecPerChamber[ch] = 0;
824 // index of first HitForRec for the chamber
825 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
826 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
827 rawclusters =fMUONData->RawClusters(ch);
828 // pMUON->ResetRawClusters();
829 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
830 nclus = (Int_t) (rawclusters->GetEntries());
831 // Loop over (cathode correlated) raw clusters
832 for (iclus = 0; iclus < nclus; iclus++) {
833 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
834 // new AliMUONHitForRec from raw cluster
835 // and increment number of AliMUONHitForRec's (total and in chamber)
836 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
838 (fNHitsForRecPerChamber[ch])++;
839 // more information into HitForRec
840 // resolution: info should be already in raw cluster and taken from it ????
841 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
842 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
843 // original raw cluster
844 hitForRec->SetChamberNumber(ch);
845 hitForRec->SetHitNumber(iclus);
846 // Z coordinate of the raw cluster (cm)
847 hitForRec->SetZ(clus->GetZ(0));
848 if (fPrintLevel >= 10) {
849 cout << "chamber (0...): " << ch <<
850 " raw cluster (0...): " << iclus << endl;
852 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
854 } // end of cluster loop
855 } // end of chamber loop
856 SortHitsForRecWithIncreasingChamber(); //AZ
860 //__________________________________________________________________________
861 void AliMUONEventReconstructor::MakeSegments(void)
863 // To make the list of segments in all stations,
864 // from the list of hits to be reconstructed
865 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
867 // Loop over stations
868 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
869 //AZ for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
870 for (Int_t st = nb; st < fgkMaxMuonTrackingStations; st++) //AZ
871 MakeSegmentsPerStation(st);
872 if (fPrintLevel >= 10) {
873 cout << "end of MakeSegments" << endl;
874 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
875 cout << "station(0...): " << st
876 << " Segments: " << fNSegments[st]
879 seg < fNSegments[st];
881 cout << "Segment index(0...): " << seg << endl;
882 ((*fSegmentsPtr[st])[seg])->Dump();
889 //__________________________________________________________________________
890 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
892 // To make the list of segments in station number "Station" (0...)
893 // from the list of hits to be reconstructed.
894 // Updates "fNSegments"[Station].
895 // Segments in stations 4 and 5 are sorted
896 // according to increasing absolute value of "impact parameter"
897 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
898 AliMUONSegment *segment;
900 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
901 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
902 if (fPrintLevel >= 1)
903 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
904 // first and second chambers (0...) in the station
905 Int_t ch1 = 2 * Station;
907 // variable true for stations downstream of the dipole:
908 // Station(0..4) equal to 3 or 4
909 if ((Station == 3) || (Station == 4)) {
911 // maximum impact parameter (cm) according to fMinBendingMomentum...
913 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
914 // minimum impact parameter (cm) according to fMaxBendingMomentum...
916 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
918 else last2st = kFALSE;
919 // extrapolation factor from Z of first chamber to Z of second chamber
920 // dZ to be changed to take into account fine structure of chambers ????
922 // index for current segment
923 Int_t segmentIndex = 0;
924 // Loop over HitsForRec in the first chamber of the station
925 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
926 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
928 // pointer to the HitForRec
929 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
931 // on the straight line joining the HitForRec to the vertex (0,0,0),
932 // to the Z of the second chamber of the station
933 // Loop over HitsForRec in the second chamber of the station
934 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
935 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
937 // pointer to the HitForRec
938 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
939 // absolute values of distances, in bending and non bending planes,
940 // between the HitForRec in the second chamber
941 // and the previous extrapolation
942 extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ();
943 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
944 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
945 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
946 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
949 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
950 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
951 // absolute value of impact parameter
953 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
955 // check for distances not too large,
956 // and impact parameter not too big if stations downstream of the dipole.
957 // Conditions "distBend" and "impactParam" correlated for these stations ????
958 if ((distBend < fSegmentMaxDistBending[Station]) &&
959 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
960 (!last2st || (impactParam < maxImpactParam)) &&
961 (!last2st || (impactParam > minImpactParam))) {
963 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
964 AliMUONSegment(hit1Ptr, hit2Ptr);
965 // update "link" to this segment from the hit in the first chamber
966 if (hit1Ptr->GetNSegments() == 0)
967 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
968 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
969 if (fPrintLevel >= 10) {
970 cout << "segmentIndex(0...): " << segmentIndex
971 << " distBend: " << distBend
972 << " distNonBend: " << distNonBend
975 cout << "HitForRec in first chamber" << endl;
977 cout << "HitForRec in second chamber" << endl;
980 // increment index for current segment
984 } // for (Int_t hit1...
985 fNSegments[Station] = segmentIndex;
986 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
987 // i.e. Station(0..4) 3 or 4, using the function "Compare".
988 // After this sorting, it is impossible to use
989 // the "fNSegments" and "fIndexOfFirstSegment"
990 // of the HitForRec in the first chamber to explore all segments formed with it.
991 // Is this sorting really needed ????
992 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
993 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
994 << fNSegments[Station] << endl;
998 //__________________________________________________________________________
999 void AliMUONEventReconstructor::MakeTracks(void)
1001 // To make the tracks,
1002 // from the list of segments and points in all stations
1003 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
1004 // The order may be important for the following Reset's
1007 if (fTrackMethod == 2) { //AZ - Kalman filter
1008 MakeTrackCandidatesK();
1009 if (fRecTracksPtr->GetEntriesFast() == 0) return;
1010 // Follow tracks in stations(1..) 3, 2 and 1
1012 // Remove double tracks
1013 RemoveDoubleTracksK();
1014 // Propagate tracks to the vertex thru absorber
1016 // Fill AliMUONTrack data members
1019 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
1020 MakeTrackCandidates();
1021 // Follow tracks in stations(1..) 3, 2 and 1
1023 // Remove double tracks
1024 RemoveDoubleTracks();
1025 UpdateTrackParamAtHit();
1026 UpdateHitForRecAtHit();
1031 //__________________________________________________________________________
1032 void AliMUONEventReconstructor::ValidateTracksWithTrigger(void)
1034 // Try to match track from tracking system with trigger track
1035 AliMUONTrack *track;
1036 TClonesArray *recTriggerTracks;
1038 fMUONData->ResetRecTriggerTracks();
1039 fMUONData->SetTreeAddress("RL");
1040 fMUONData->GetRecTriggerTracks();
1041 recTriggerTracks = fMUONData->RecTriggerTracks();
1043 track = (AliMUONTrack*) fRecTracksPtr->First();
1045 track->MatchTriggerTrack(recTriggerTracks);
1046 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1051 //__________________________________________________________________________
1052 Bool_t AliMUONEventReconstructor::MakeTriggerTracks(void)
1054 // To make the trigger tracks from Local Trigger
1055 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
1056 // ResetTriggerTracks();
1060 TClonesArray *localTrigger;
1061 TClonesArray *globalTrigger;
1062 AliMUONLocalTrigger *locTrg;
1063 AliMUONGlobalTrigger *gloTrg;
1064 AliMUONTriggerCircuit *circuit;
1065 AliMUONTriggerTrack *recTriggerTrack = 0;
1067 TTree* treeR = fLoader->TreeR();
1069 // Loading MUON subsystem
1070 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1072 nTRentries = Int_t(treeR->GetEntries());
1074 treeR->GetEvent(0); // only one entry
1076 if (!(fMUONData->IsTriggerBranchesInTree())) {
1077 AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries));
1081 fMUONData->SetTreeAddress("TC");
1082 fMUONData->GetTrigger();
1084 // global trigger for trigger pattern
1086 globalTrigger = fMUONData->GlobalTrigger();
1087 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1089 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1090 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1091 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1093 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1094 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1095 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1097 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1098 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1099 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1101 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1102 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1103 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1105 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1106 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1107 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1112 // local trigger for tracking
1113 localTrigger = fMUONData->LocalTrigger();
1114 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1115 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1116 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1118 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1119 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1120 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1121 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1122 Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
1123 Float_t y21 = circuit->GetY21Pos(stripX21);
1124 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1125 Float_t thetax = TMath::ATan2( x11 , z11 );
1126 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1128 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1129 // since static statement does not work, set gloTrigPat for each track
1131 // fNRecTriggerTracks++;
1132 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
1133 } // end of loop on Local Trigger
1137 //__________________________________________________________________________
1138 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1140 // To make track candidates with two segments in stations(1..) 4 and 5,
1141 // the first segment being pointed to by "BegSegment".
1142 // Returns the number of such track candidates.
1143 Int_t endStation, iEndSegment, nbCan2Seg;
1144 AliMUONSegment *endSegment;
1145 AliMUONSegment *extrapSegment = NULL;
1146 AliMUONTrack *recTrack;
1148 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1149 // Station for the end segment
1150 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1151 // multiple scattering factor corresponding to one chamber
1152 mcsFactor = 0.0136 /
1153 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1154 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1155 // linear extrapolation to end station
1156 // number of candidates with 2 segments to 0
1158 // Loop over segments in the end station
1159 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1160 // pointer to segment
1161 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1162 // test compatibility between current segment and "extrapSegment"
1163 // 4 because 4 quantities in chi2
1165 BegSegment->CreateSegmentFromLinearExtrapToStation(endSegment->GetZ(), mcsFactor);
1167 NormalizedChi2WithSegment(extrapSegment,
1168 fMaxSigma2Distance)) <= 4.0) {
1169 // both segments compatible:
1170 // make track candidate from "begSegment" and "endSegment"
1171 if (fPrintLevel >= 2)
1172 cout << "TrackCandidate with Segment " << iEndSegment <<
1173 " in Station(0..) " << endStation << endl;
1174 // flag for both segments in one track:
1175 // to be done in track constructor ????
1176 BegSegment->SetInTrack(kTRUE);
1177 endSegment->SetInTrack(kTRUE);
1178 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1179 AliMUONTrack(BegSegment, endSegment, this);
1181 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1182 // increment number of track candidates with 2 segments
1185 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1186 } // for (iEndSegment = 0;...
1190 //__________________________________________________________________________
1191 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1193 // To make track candidates with one segment and one point
1194 // in stations(1..) 4 and 5,
1195 // the segment being pointed to by "BegSegment".
1196 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1197 AliMUONHitForRec *extrapHitForRec= NULL;
1198 AliMUONHitForRec *hit;
1199 AliMUONTrack *recTrack;
1201 if (fPrintLevel >= 1)
1202 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1203 // station for the end point
1204 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1205 // multiple scattering factor corresponding to one chamber
1206 mcsFactor = 0.0136 /
1207 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1208 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1209 // first and second chambers(0..) in the end station
1210 ch1 = 2 * endStation;
1212 // number of candidates to 0
1214 // Loop over chambers of the end station
1215 for (ch = ch2; ch >= ch1; ch--) {
1216 // limits for the hit index in the loop
1217 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1218 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1219 // Loop over HitForRec's in the chamber
1220 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1221 // pointer to HitForRec
1222 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1223 // test compatibility between current HitForRec and "extrapHitForRec"
1224 // 2 because 2 quantities in chi2
1225 // linear extrapolation to chamber
1227 BegSegment->CreateHitForRecFromLinearExtrapToChamber( hit->GetZ(), mcsFactor);
1229 NormalizedChi2WithHitForRec(extrapHitForRec,
1230 fMaxSigma2Distance)) <= 2.0) {
1231 // both HitForRec's compatible:
1232 // make track candidate from begSegment and current HitForRec
1233 if (fPrintLevel >= 2)
1234 cout << "TrackCandidate with HitForRec " << iHit <<
1235 " in Chamber(0..) " << ch << endl;
1236 // flag for beginning segments in one track:
1237 // to be done in track constructor ????
1238 BegSegment->SetInTrack(kTRUE);
1239 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1240 AliMUONTrack(BegSegment, hit, this);
1241 // the right place to eliminate "double counting" ???? how ????
1243 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1244 // increment number of track candidates
1247 delete extrapHitForRec;
1248 } // for (iHit = iHitMin;...
1249 } // for (ch = ch2;...
1250 return nbCan1Seg1Hit;
1253 //__________________________________________________________________________
1254 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1256 // To make track candidates
1257 // with at least 3 aligned points in stations(1..) 4 and 5
1258 // (two Segment's or one Segment and one HitForRec)
1259 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1260 AliMUONSegment *begSegment;
1261 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1262 // Loop over stations(1..) 5 and 4 for the beginning segment
1263 for (begStation = 4; begStation > 2; begStation--) {
1264 // Loop over segments in the beginning station
1265 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1266 // pointer to segment
1267 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1268 if (fPrintLevel >= 2)
1269 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1270 " in Station(0..) " << begStation << endl;
1271 // Look for track candidates with two segments,
1272 // "begSegment" and all compatible segments in other station.
1273 // Only for beginning station(1..) 5
1274 // because candidates with 2 segments have to looked for only once.
1275 if (begStation == 4)
1276 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1277 // Look for track candidates with one segment and one point,
1278 // "begSegment" and all compatible HitForRec's in other station.
1279 // Only if "begSegment" does not belong already to a track candidate.
1280 // Is that a too strong condition ????
1281 if (!(begSegment->GetInTrack()))
1282 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1283 } // for (iBegSegment = 0;...
1284 } // for (begStation = 4;...
1288 //__________________________________________________________________________
1289 void AliMUONEventReconstructor::FollowTracks(void)
1291 // Follow tracks in stations(1..) 3, 2 and 1
1292 // too long: should be made more modular !!!!
1293 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1294 AliMUONSegment *bestSegment, *extrapSegment, *segment;
1295 AliMUONTrack *track, *nextTrack;
1296 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1297 // -1 to avoid compilation warnings
1298 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1299 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1300 Double_t bendingMomentum, chi2Norm = 0.;
1301 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1302 // local maxSigma2Distance, for easy increase in testing
1303 maxSigma2Distance = fMaxSigma2Distance;
1304 if (fPrintLevel >= 2)
1305 cout << "enter FollowTracks" << endl;
1306 // Loop over track candidates
1307 track = (AliMUONTrack*) fRecTracksPtr->First();
1310 // Follow function for each track candidate ????
1312 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1313 if (fPrintLevel >= 2)
1314 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1315 // Fit track candidate
1316 track->SetFitMCS(0); // without multiple Coulomb scattering
1317 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1318 track->SetFitStart(0); // from parameters at vertex
1320 if (fPrintLevel >= 10) {
1321 cout << "FollowTracks: track candidate(0..): " << trackIndex
1322 << " after fit in stations(0..) 3 and 4" << endl;
1323 track->RecursiveDump();
1325 // Loop over stations(1..) 3, 2 and 1
1326 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1327 // otherwise: majority coincidence 2 !!!!
1328 for (station = 2; station >= 0; station--) {
1329 // Track parameters at first track hit (smallest Z)
1330 trackParam1 = ((AliMUONTrackHit*)
1331 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1332 // extrapolation to station
1333 trackParam1->ExtrapToStation(station, trackParam);
1334 extrapSegment = new AliMUONSegment(); // empty segment
1335 // multiple scattering factor corresponding to one chamber
1336 // and momentum in bending plane (not total)
1337 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1338 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1339 // Z difference from previous station
1340 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1341 (&(pMUON->Chamber(2 * station + 2)))->Z();
1342 // Z difference between the two previous stations
1343 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1344 (&(pMUON->Chamber(2 * station + 4)))->Z();
1345 // Z difference between the two chambers in the previous station
1346 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1347 (&(pMUON->Chamber(2 * station + 1)))->Z();
1348 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1350 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1351 extrapSegment->UpdateFromStationTrackParam
1352 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1353 trackParam1->GetInverseBendingMomentum());
1356 if (fPrintLevel >= 10) {
1357 cout << "FollowTracks: track candidate(0..): " << trackIndex
1358 << " Look for segment in station(0..): " << station << endl;
1360 // Loop over segments in station
1361 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1362 // Look for best compatible Segment in station
1363 // should consider all possibilities ????
1364 // multiple scattering ????
1365 // separation in 2 functions: Segment and HitForRec ????
1366 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1367 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1368 // according to real Z value of "segment" and slopes of "extrapSegment"
1369 (&(trackParam[0]))->ExtrapToZ(segment->GetZ());
1370 (&(trackParam[1]))->ExtrapToZ(segment->GetZ());
1371 extrapSegment->SetBendingCoor((&(trackParam[0]))->GetBendingCoor());
1372 extrapSegment->SetNonBendingCoor((&(trackParam[0]))->GetNonBendingCoor());
1373 extrapSegment->SetBendingSlope((&(trackParam[0]))->GetBendingSlope());
1374 extrapSegment->SetNonBendingSlope((&(trackParam[0]))->GetNonBendingSlope());
1376 NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1377 if (chi2 < bestChi2) {
1378 // update best Chi2 and Segment if better found
1379 bestSegment = segment;
1384 // best segment found: add it to track candidate
1385 (&(trackParam[0]))->ExtrapToZ(bestSegment->GetZ());
1386 (&(trackParam[1]))->ExtrapToZ(bestSegment->GetZ());
1387 track->AddSegment(bestSegment);
1388 // set track parameters at these two TrakHit's
1389 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1390 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1391 if (fPrintLevel >= 10) {
1392 cout << "FollowTracks: track candidate(0..): " << trackIndex
1393 << " Added segment in station(0..): " << station << endl;
1394 track->RecursiveDump();
1398 // No best segment found:
1399 // Look for best compatible HitForRec in station:
1400 // should consider all possibilities ????
1401 // multiple scattering ???? do about like for extrapSegment !!!!
1402 extrapHit = new AliMUONHitForRec(); // empty hit
1405 if (fPrintLevel >= 10) {
1406 cout << "FollowTracks: track candidate(0..): " << trackIndex
1407 << " Segment not found, look for hit in station(0..): " << station
1410 // Loop over chambers of the station
1411 for (chInStation = 0; chInStation < 2; chInStation++) {
1412 ch = 2 * station + chInStation;
1413 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1414 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1415 fNHitsForRecPerChamber[ch];
1417 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1418 // coordinates of extrapolated hit
1419 (&(trackParam[chInStation]))->ExtrapToZ(hit->GetZ());
1421 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1423 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1424 // resolutions from "extrapSegment"
1425 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1426 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1427 // Loop over hits in the chamber
1428 // condition for hit not already in segment ????
1429 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1430 if (chi2 < bestChi2) {
1431 // update best Chi2 and HitForRec if better found
1434 chBestHit = chInStation;
1439 // best hit found: add it to track candidate
1440 (&(trackParam[chBestHit]))->ExtrapToZ(bestHit->GetZ());
1441 track->AddHitForRec(bestHit);
1442 // set track parameters at this TrackHit
1443 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1444 &(trackParam[chBestHit]));
1445 if (fPrintLevel >= 10) {
1446 cout << "FollowTracks: track candidate(0..): " << trackIndex
1447 << " Added hit in station(0..): " << station << endl;
1448 track->RecursiveDump();
1452 // Remove current track candidate
1453 // and corresponding TrackHit's, ...
1455 delete extrapSegment;
1457 break; // stop the search for this candidate:
1458 // exit from the loop over station
1462 delete extrapSegment;
1463 // Sort track hits according to increasing Z
1464 track->GetTrackHitsPtr()->Sort();
1465 // Update track parameters at first track hit (smallest Z)
1466 trackParam1 = ((AliMUONTrackHit*)
1467 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1468 bendingMomentum = 0.;
1469 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1470 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1471 // Track removed if bendingMomentum not in window [min, max]
1472 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1474 break; // stop the search for this candidate:
1475 // exit from the loop over station
1478 // with multiple Coulomb scattering if all stations
1479 if (station == 0) track->SetFitMCS(1);
1480 // without multiple Coulomb scattering if not all stations
1481 else track->SetFitMCS(0);
1482 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1483 track->SetFitStart(1); // from parameters at first hit
1485 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1486 if (numberOfDegFree > 0) {
1487 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1491 // Track removed if normalized chi2 too high
1492 if (chi2Norm > fMaxChi2) {
1494 break; // stop the search for this candidate:
1495 // exit from the loop over station
1497 if (fPrintLevel >= 10) {
1498 cout << "FollowTracks: track candidate(0..): " << trackIndex
1499 << " after fit from station(0..): " << station << " to 4" << endl;
1500 track->RecursiveDump();
1502 // Track extrapolation to the vertex through the absorber (Branson)
1503 // after going through the first station
1505 trackParamVertex = *trackParam1;
1506 (&trackParamVertex)->ExtrapToVertex(0.,0.,0.);
1507 track->SetTrackParamAtVertex(&trackParamVertex);
1508 if (fPrintLevel >= 1) {
1509 cout << "FollowTracks: track candidate(0..): " << trackIndex
1510 << " after extrapolation to vertex" << endl;
1511 track->RecursiveDump();
1514 } // for (station = 2;...
1515 // go really to next track
1518 // Compression of track array (necessary after Remove ????)
1519 fRecTracksPtr->Compress();
1523 //__________________________________________________________________________
1524 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1526 // To remove double tracks.
1527 // Tracks are considered identical
1528 // if they have at least half of their hits in common.
1529 // Among two identical tracks, one keeps the track with the larger number of hits
1530 // or, if these numbers are equal, the track with the minimum Chi2.
1531 AliMUONTrack *track1, *track2, *trackToRemove;
1532 Bool_t identicalTracks;
1533 Int_t hitsInCommon, nHits1, nHits2;
1534 identicalTracks = kTRUE;
1535 while (identicalTracks) {
1536 identicalTracks = kFALSE;
1537 // Loop over first track of the pair
1538 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1539 while (track1 && (!identicalTracks)) {
1540 nHits1 = track1->GetNTrackHits();
1541 // Loop over second track of the pair
1542 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1543 while (track2 && (!identicalTracks)) {
1544 nHits2 = track2->GetNTrackHits();
1545 // number of hits in common between two tracks
1546 hitsInCommon = track1->HitsInCommon(track2);
1547 // check for identical tracks
1548 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1549 identicalTracks = kTRUE;
1550 // decide which track to remove
1551 if (nHits1 > nHits2) trackToRemove = track2;
1552 else if (nHits1 < nHits2) trackToRemove = track1;
1553 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1554 trackToRemove = track2;
1555 else trackToRemove = track1;
1557 trackToRemove->Remove();
1559 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1561 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1567 //__________________________________________________________________________
1568 void AliMUONEventReconstructor::UpdateTrackParamAtHit()
1570 // Set track parameters after track fitting. Fill fTrackParamAtHit of AliMUONTrack's
1571 AliMUONTrack *track;
1572 AliMUONTrackHit *trackHit;
1573 AliMUONTrackParam *trackParam;
1574 track = (AliMUONTrack*) fRecTracksPtr->First();
1576 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1578 trackParam = trackHit->GetTrackParam();
1579 track->AddTrackParamAtHit(trackParam);
1580 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1582 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1587 //__________________________________________________________________________
1588 void AliMUONEventReconstructor::UpdateHitForRecAtHit()
1590 // Set cluster parameterss after track fitting. Fill fHitForRecAtHit of AliMUONTrack's
1591 AliMUONTrack *track;
1592 AliMUONTrackHit *trackHit;
1593 AliMUONHitForRec *hitForRec;
1594 track = (AliMUONTrack*) fRecTracksPtr->First();
1596 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1598 hitForRec = trackHit->GetHitForRecPtr();
1599 track->AddHitForRecAtHit(hitForRec);
1600 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1602 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1607 //__________________________________________________________________________
1608 void AliMUONEventReconstructor::FillMUONTrack()
1610 // Set track parameters at hits for Kalman track. Fill fTrackParamAtHit of AliMUONTrack's
1611 AliMUONTrackK *track;
1612 track = (AliMUONTrackK*) fRecTracksPtr->First();
1614 track->FillMUONTrack();
1615 track = (AliMUONTrackK*) fRecTracksPtr->After(track);
1620 //__________________________________________________________________________
1621 void AliMUONEventReconstructor::EventDump(void)
1623 // Dump reconstructed event (track parameters at vertex and at first hit),
1624 // and the particle parameters
1626 AliMUONTrack *track;
1627 AliMUONTrackParam *trackParam, *trackParam1;
1628 Double_t bendingSlope, nonBendingSlope, pYZ;
1629 Double_t pX, pY, pZ, x, y, z, c;
1630 Int_t np, trackIndex, nTrackHits;
1632 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1633 if (fPrintLevel >= 1) {
1634 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1636 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1637 // Loop over reconstructed tracks
1638 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1639 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1640 if (fPrintLevel >= 1)
1641 cout << " track number: " << trackIndex << endl;
1642 // function for each track for modularity ????
1643 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1644 nTrackHits = track->GetNTrackHits();
1645 if (fPrintLevel >= 1)
1646 cout << " number of track hits: " << nTrackHits << endl;
1647 // track parameters at Vertex
1648 trackParam = track->GetTrackParamAtVertex();
1649 x = trackParam->GetNonBendingCoor();
1650 y = trackParam->GetBendingCoor();
1651 z = trackParam->GetZ();
1652 bendingSlope = trackParam->GetBendingSlope();
1653 nonBendingSlope = trackParam->GetNonBendingSlope();
1654 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1655 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1656 pX = pZ * nonBendingSlope;
1657 pY = pZ * bendingSlope;
1658 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1659 if (fPrintLevel >= 1)
1660 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1661 z, x, y, pX, pY, pZ, c);
1663 // track parameters at first hit
1664 trackParam1 = ((AliMUONTrackHit*)
1665 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1666 x = trackParam1->GetNonBendingCoor();
1667 y = trackParam1->GetBendingCoor();
1668 z = trackParam1->GetZ();
1669 bendingSlope = trackParam1->GetBendingSlope();
1670 nonBendingSlope = trackParam1->GetNonBendingSlope();
1671 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1672 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1673 pX = pZ * nonBendingSlope;
1674 pY = pZ * bendingSlope;
1675 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1676 if (fPrintLevel >= 1)
1677 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1678 z, x, y, pX, pY, pZ, c);
1680 // informations about generated particles
1681 np = gAlice->GetMCApp()->GetNtrack();
1682 printf(" **** number of generated particles: %d \n", np);
1684 // for (Int_t iPart = 0; iPart < np; iPart++) {
1685 // p = gAlice->Particle(iPart);
1686 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1687 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1693 //__________________________________________________________________________
1694 void AliMUONEventReconstructor::EventDumpTrigger(void)
1696 // Dump reconstructed trigger event
1697 // and the particle parameters
1699 AliMUONTriggerTrack *triggertrack ;
1700 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
1702 if (fPrintLevel >= 1) {
1703 cout << "****** enter EventDumpTrigger ******" << endl;
1704 cout << " Number of Reconstructed tracks :" << nTriggerTracks << endl;
1706 // Loop over reconstructed tracks
1707 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1708 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
1709 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1711 triggertrack->GetX11(),triggertrack->GetY11(),
1712 triggertrack->GetThetax(),triggertrack->GetThetay());
1716 //__________________________________________________________________________
1717 void AliMUONEventReconstructor::FillEvent()
1719 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1720 // leaf in the Event branch of TreeRecoEvent tree
1721 cout << "Enter FillEvent() ...\n";
1724 fRecoEvent = new AliMUONRecoEvent();
1726 fRecoEvent->Clear();
1728 //save current directory
1729 TDirectory *current = gDirectory;
1730 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1731 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1732 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1733 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1734 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1735 TBranch *branch = fEventTree->GetBranch("Event");
1736 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1737 branch->SetAutoDelete();
1742 // restore directory
1746 //__________________________________________________________________________
1747 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1749 // To make initial tracks for Kalman filter from the list of segments
1751 AliMUONSegment *segment;
1752 AliMUONTrackK *trackK;
1754 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1755 // Reset the TClonesArray of reconstructed tracks
1756 if (fRecTracksPtr) fRecTracksPtr->Delete();
1757 // Delete in order that the Track destructors are called,
1758 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1761 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1762 // Loop over stations(1...) 5 and 4
1763 for (istat=4; istat>=3; istat--) {
1764 // Loop over segments in the station
1765 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1766 // Transform segments to tracks and evaluate covariance matrix
1767 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1768 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1770 } // for (iseg=0;...)
1771 } // for (istat=4;...)
1775 //__________________________________________________________________________
1776 void AliMUONEventReconstructor::FollowTracksK(void)
1778 // Follow tracks using Kalman filter
1780 Int_t icand, ichamBeg = 0, ichamEnd, chamBits;
1781 Double_t zDipole1, zDipole2;
1782 AliMUONTrackK *trackK;
1783 AliMUONHitForRec *hit;
1784 AliMUONRawCluster *clus;
1785 TClonesArray *rawclusters;
1786 clus = 0; rawclusters = 0;
1788 //AZ(z->-z) zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1789 //AZ(z->-z) zDipole2 = zDipole1 + GetSimpleBLength();
1790 zDipole1 = GetSimpleBPosition() + GetSimpleBLength()/2;
1791 zDipole2 = zDipole1 - GetSimpleBLength();
1794 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[0]);
1795 if (trackK->DebugLevel() > 0) {
1796 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1797 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1798 //if (hit->GetTTRTrack() > 1 || hit->GetTrackRefSignal() == 0) continue;
1799 printf(" Hit # %d %10.4f %10.4f %10.4f",
1800 hit->GetChamberNumber(), hit->GetBendingCoor(),
1801 hit->GetNonBendingCoor(), hit->GetZ());
1802 if (fRecTrackRefHits) {
1803 // from track ref hits
1804 printf(" %3d %3d \n", hit->GetTrackRefSignal(), hit->GetTTRTrack());
1806 // from raw clusters
1807 rawclusters = fMUONData->RawClusters(hit->GetChamberNumber());
1808 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1810 printf("%3d", clus->GetTrack(1)-1);
1811 if (clus->GetTrack(2) != 0) printf("%3d \n", clus->GetTrack(2)-1);
1813 } // if (fRecTrackRefHits)
1815 } // if (trackK->DebugLevel() > 0)
1819 nSeeds = fNRecTracks; // starting number of seeds
1820 // Loop over track candidates
1821 while (icand < fNRecTracks-1) {
1823 if (trackK->DebugLevel()>0) cout << " *** Kalman track candidate No. " << icand << endl;
1824 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1825 if (trackK->GetRecover() < 0) continue; // failed track
1827 // Discard candidate which will produce the double track
1830 ok = CheckCandidateK(icand,nSeeds);
1832 trackK->SetRecover(-1); // mark candidate to be removed
1839 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1840 trackK->GetHitOnTrack()->Last(); // last hit
1841 //else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1842 else hit = trackK->GetHitLastOk(); // hit where track stopped
1843 if (hit) ichamBeg = hit->GetChamberNumber();
1845 // Check propagation direction
1846 if (hit == NULL) ichamBeg = ichamEnd;
1847 //AZ(z->-z) else if (trackK->GetTrackDir() > 0) {
1848 else if (trackK->GetTrackDir() < 0) {
1849 ichamEnd = 9; // forward propagation
1850 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1852 ichamBeg = ichamEnd;
1853 ichamEnd = 6; // backward propagation
1854 // Change weight matrix and zero fChi2 for backpropagation
1855 trackK->StartBack();
1856 //AZ trackK->SetTrackDir(-1);
1857 trackK->SetTrackDir(1);
1858 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1859 ichamBeg = ichamEnd;
1863 if (trackK->GetBPFlag()) {
1865 ichamEnd = 6; // backward propagation
1866 // Change weight matrix and zero fChi2 for backpropagation
1867 trackK->StartBack();
1868 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1869 ichamBeg = ichamEnd;
1875 //AZ trackK->SetTrackDir(-1);
1876 trackK->SetTrackDir(1);
1877 trackK->SetBPFlag(kFALSE);
1878 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1880 if (!ok) { trackK->SetRecover(-1); continue; } // mark candidate to be removed
1883 if (trackK->GetRecover() >= 0) {
1884 ok = trackK->Smooth();
1885 if (!ok) trackK->SetRecover(-1); // mark candidate to be removed
1888 // Majority 3 of 4 in first 2 stations
1891 Double_t chi2_max = 0;
1892 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1893 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1894 chamBits |= BIT(hit->GetChamberNumber());
1895 if (trackK->GetChi2PerPoint(i) > chi2_max) chi2_max = trackK->GetChi2PerPoint(i);
1897 if (!((chamBits&3)==3 || (chamBits>>2&3)==3) && chi2_max > 25) {
1898 //trackK->Recover();
1899 trackK->SetRecover(-1); //mark candidate to be removed
1902 if (ok) trackK->SetTrackQuality(0); // compute "track quality"
1905 for (Int_t i=0; i<fNRecTracks; i++) {
1906 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1907 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1910 // Compress TClonesArray
1911 fRecTracksPtr->Compress();
1912 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1916 //__________________________________________________________________________
1917 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds) const
1919 // Discards track candidate if it will produce the double track (having
1920 // the same seed segment hits as hits of a good track found before)
1921 AliMUONTrackK *track1, *track2;
1922 AliMUONHitForRec *hit1, *hit2, *hit;
1924 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1925 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1926 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1928 for (Int_t i=0; i<icand; i++) {
1929 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1930 //if (track2->GetRecover() < 0) continue;
1931 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1933 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1937 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1938 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1939 if (hit == hit1 || hit == hit2) {
1941 if (nSame == 2) return kFALSE;
1943 } // for (Int_t j=0;
1945 } // for (Int_t i=0;
1949 //__________________________________________________________________________
1950 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1952 // Removes double tracks (sharing more than half of their hits). Keeps
1953 // the track with higher quality
1954 AliMUONTrackK *track1, *track2, *trackToKill;
1956 // Sort tracks according to their quality
1957 fRecTracksPtr->Sort();
1959 // Loop over first track of the pair
1960 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1961 Int_t debug = track1->DebugLevel();
1963 // Loop over second track of the pair
1964 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1966 // Check whether or not to keep track2
1967 if (!track2->KeepTrack(track1)) {
1968 if (debug >= 0) cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1969 " " << track2->GetTrackQuality() << endl;
1970 trackToKill = track2;
1971 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1972 trackToKill->Kill();
1973 fRecTracksPtr->Compress();
1974 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1976 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1979 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1980 if (debug >= 0) cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1983 //__________________________________________________________________________
1984 void AliMUONEventReconstructor::GoToVertex(void)
1986 // Propagates track to the vertex thru absorber
1987 // (using Branson correction for now)
1991 for (Int_t i=0; i<fNRecTracks; i++) {
1992 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1993 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1994 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1995 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(1); // with absorber
1999 //__________________________________________________________________________
2000 void AliMUONEventReconstructor::SetTrackMethod(Int_t iTrackMethod)
2002 // Set track method and recreate track container if necessary
2004 fTrackMethod = iTrackMethod == 2 ? 2 : 1;
2005 if (fTrackMethod == 2) {
2006 if (fRecTracksPtr) delete fRecTracksPtr;
2007 fRecTracksPtr = new TClonesArray("AliMUONTrackK", 10);
2008 cout << " *** Tracking with the Kalman filter *** " << endl;
2009 } else cout << " *** Traditional tracking *** " << endl;