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");
152 // Loading AliRun master
153 AliRunLoader* runloader = fLoader->GetRunLoader();
154 if (runloader->GetAliRun() == 0x0) runloader->LoadgAlice();
155 gAlice = runloader->GetAliRun();
159 //__________________________________________________________________________
160 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& rhs)
163 // Protected copy constructor
165 AliFatal("Not implemented.");
168 AliMUONEventReconstructor &
169 AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& rhs)
171 // Protected assignement operator
173 if (this == &rhs) return *this;
175 AliFatal("Not implemented.");
180 //__________________________________________________________________________
181 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
183 // Destructor for class AliMUONEventReconstructor
188 // if (fEventTree) delete fEventTree;
189 if (fRecoEvent) delete fRecoEvent;
190 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
191 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
192 delete fSegmentsPtr[st]; // Correct destruction of everything ????
196 //__________________________________________________________________________
197 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
199 // Set reconstruction parameters to default values
200 // Would be much more convenient with a structure (or class) ????
201 fMinBendingMomentum = fgkDefaultMinBendingMomentum;
202 fMaxBendingMomentum = fgkDefaultMaxBendingMomentum;
203 fMaxChi2 = fgkDefaultMaxChi2;
204 fMaxSigma2Distance = fgkDefaultMaxSigma2Distance;
206 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
207 // ******** Parameters for making HitsForRec
209 // like in TRACKF_STAT:
210 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
211 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
212 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
213 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
214 2.0 * TMath::Pi() / 180.0;
215 else fRMin[ch] = 30.0;
216 // maximum radius at 10 degrees and Z of chamber
217 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
218 10.0 * TMath::Pi() / 180.0;
221 // ******** Parameters for making segments
222 // should be parametrized ????
223 // according to interval between chambers in a station ????
224 // Maximum distance in non bending plane
225 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
227 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
228 fSegmentMaxDistNonBending[st] = 5. * 0.22;
229 // Maximum distance in bending plane:
230 // values from TRACKF_STAT, corresponding to (J psi 20cm),
231 // scaled to the real distance between chambers in a station
232 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
233 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
234 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
235 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
236 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
237 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
238 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
239 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
240 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
241 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
243 fBendingResolution = fgkDefaultBendingResolution;
244 fNonBendingResolution = fgkDefaultNonBendingResolution;
245 fChamberThicknessInX0 = fgkDefaultChamberThicknessInX0;
246 fSimpleBValue = fgkDefaultSimpleBValue;
247 fSimpleBLength = fgkDefaultSimpleBLength;
248 fSimpleBPosition = fgkDefaultSimpleBPosition;
249 fRecTrackRefHits = fgkDefaultRecTrackRefHits;
250 fEfficiency = fgkDefaultEfficiency;
251 fPrintLevel = fgkDefaultPrintLevel;
255 //__________________________________________________________________________
256 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
258 // Returns impact parameter at vertex in bending plane (cm),
259 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
260 // using simple values for dipole magnetic field.
261 // The sign of "BendingMomentum" is the sign of the charge.
262 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
266 //__________________________________________________________________________
267 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
269 // Returns signed bending momentum in bending plane (GeV/c),
270 // the sign being the sign of the charge for particles moving forward in Z,
271 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
272 // using simple values for dipole magnetic field.
273 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
277 //__________________________________________________________________________
278 void AliMUONEventReconstructor::SetBkgTrackRefFile(Text_t *BkgTrackRefFileName)
280 // Set background file ... for track ref. hits
281 // Must be called after having loaded the firts signal event
282 if (fPrintLevel >= 0) {
283 cout << "Enter SetBkgTrackRefFile with BkgTrackRefFileName ``"
284 << BkgTrackRefFileName << "''" << endl;}
285 if (strlen(BkgTrackRefFileName)) {
286 // BkgTrackRefFileName not empty: try to open the file
287 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
288 fBkgTrackRefFile = new TFile(BkgTrackRefFileName);
289 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
290 if (fBkgTrackRefFile-> IsOpen()) {
291 if (fPrintLevel >= 0) {
292 cout << "Background for Track ref. hits in file: ``" << BkgTrackRefFileName
293 << "'' successfully opened" << endl;}
296 cout << "Background for Track Ref. hits in file: " << BkgTrackRefFileName << endl;
297 cout << "NOT FOUND: EXIT" << endl;
298 exit(0); // right instruction for exit ????
300 // Arrays for "particles" and "hits"
301 fBkgTrackRefParticles = new TClonesArray("TParticle", 200);
302 // Event number to -1 for initialization
303 fBkgTrackRefEventNumber = -1;
304 // Back to the signal file:
305 // first signal event must have been loaded previously,
306 // otherwise, Segmentation violation at the next instruction
307 // How is it possible to do smething better ????
308 ((gAlice->TreeK())->GetCurrentFile())->cd();
309 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
314 //__________________________________________________________________________
315 void AliMUONEventReconstructor::NextBkgTrackRefEvent(void)
317 // Get next event in background file for track ref. hits
318 // Goes back to event number 0 when end of file is reached
320 if (fPrintLevel >= 0) {
321 cout << "Enter NextBkgTrackRefEvent" << endl;}
322 // Clean previous event
323 if(fBkgTrackRefTK) delete fBkgTrackRefTK;
324 fBkgTrackRefTK = NULL;
325 if(fBkgTrackRefParticles) fBkgTrackRefParticles->Clear();
326 if(fBkgTrackRefTTR) delete fBkgTrackRefTTR;
327 fBkgTrackRefTTR = NULL;
328 // Increment event number
329 fBkgTrackRefEventNumber++;
330 // Get access to Particles and Hits for event from background file
331 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
332 fBkgTrackRefFile->cd();
333 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
334 // Particles: TreeK for event and branch "Particles"
335 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
336 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
337 if (!fBkgTrackRefTK) {
338 if (fPrintLevel >= 0) {
339 cout << "Cannot find Kine Tree for background event: " <<
340 fBkgTrackRefEventNumber << endl;
341 cout << "Goes back to event 0" << endl;
343 fBkgTrackRefEventNumber = 0;
344 sprintf(treeName, "TreeK%d", fBkgTrackRefEventNumber);
345 fBkgTrackRefTK = (TTree*)gDirectory->Get(treeName);
346 if (!fBkgTrackRefTK) {
347 AliError(Form("cannot find Kine Tree for background event: %d",fBkgTrackRefEventNumber));
352 fBkgTrackRefTK->SetBranchAddress("Particles", &fBkgTrackRefParticles);
353 fBkgTrackRefTK->GetEvent(0); // why event 0 ???? necessary ????
354 // Hits: TreeH for event and branch "MUON"
355 sprintf(treeName, "TreeTR%d", fBkgTrackRefEventNumber);
356 fBkgTrackRefTTR = (TTree*)gDirectory->Get(treeName);
357 if (!fBkgTrackRefTTR) {
358 AliError(Form("cannot find Hits Tree for background event: %d",fBkgTrackRefEventNumber));
361 fBkgTrackRefTTR->GetEntries(); // necessary ????
362 // Back to the signal file
363 ((gAlice->TreeK())->GetCurrentFile())->cd();
364 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
368 //__________________________________________________________________________
369 void AliMUONEventReconstructor::EventReconstruct(void)
371 // To reconstruct one event
372 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
373 MakeEventToBeReconstructed();
376 if (fMUONData->IsTriggerTrackBranchesInTree())
377 ValidateTracksWithTrigger();
379 // Add tracks to MUON data container
380 for(Int_t i=0; i<GetNRecTracks(); i++) {
381 AliMUONTrack * track = (AliMUONTrack*) GetRecTracksPtr()->At(i);
382 fMUONData->AddRecTrack(*track);
388 //__________________________________________________________________________
389 void AliMUONEventReconstructor::EventReconstructTrigger(void)
391 // To reconstruct one event
392 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
397 //__________________________________________________________________________
398 void AliMUONEventReconstructor::ResetHitsForRec(void)
400 // To reset the array and the number of HitsForRec,
401 // and also the number of HitsForRec
402 // and the index of the first HitForRec per chamber
403 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
405 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++)
406 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
410 //__________________________________________________________________________
411 void AliMUONEventReconstructor::ResetSegments(void)
413 // To reset the TClonesArray of segments and the number of Segments
415 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
416 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
422 //__________________________________________________________________________
423 void AliMUONEventReconstructor::ResetTracks(void)
425 // To reset the TClonesArray of reconstructed tracks
426 if (fRecTracksPtr) fRecTracksPtr->Delete();
427 // Delete in order that the Track destructors are called,
428 // hence the space for the TClonesArray of pointers to TrackHit's is freed
433 //__________________________________________________________________________
434 void AliMUONEventReconstructor::ResetTriggerTracks(void)
436 // To reset the TClonesArray of reconstructed trigger tracks
437 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
438 // Delete in order that the Track destructors are called,
439 // hence the space for the TClonesArray of pointers to TrackHit's is freed
440 fNRecTriggerTracks = 0;
444 //__________________________________________________________________________
445 void AliMUONEventReconstructor::ResetTrackHits(void)
447 // To reset the TClonesArray of hits on reconstructed tracks
448 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
453 //__________________________________________________________________________
454 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
456 // To make the list of hits to be reconstructed,
457 // either from the track ref. hits or from the raw clusters
458 // according to the parameter set for the reconstructor
459 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
461 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
464 // Error("MakeEventToBeReconstructed",
465 // "Can not find Run Loader in Event Folder named %s.",
466 // evfoldname.Data());
469 // AliLoader* gime = rl->GetLoader("MUONLoader");
472 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
475 AliRunLoader *runLoader = fLoader->GetRunLoader();
477 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
479 if (fRecTrackRefHits == 1) {
480 // Reconstruction from track ref. hits
481 // Back to the signal file
482 TTree* treeTR = runLoader->TreeTR();
485 Int_t retval = runLoader->LoadTrackRefs("READ");
488 AliError("Error occured while loading hits.");
491 treeTR = runLoader->TreeTR();
494 AliError("Can not get TreeTR");
499 AddHitsForRecFromTrackRef(treeTR,1);
502 AddHitsForRecFromTrackRef(fBkgTrackRefTTR,0);
503 // Sort HitsForRec in increasing order with respect to chamber number
504 SortHitsForRecWithIncreasingChamber();
507 // Reconstruction from raw clusters
508 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
509 // Security on MUON ????
510 // TreeR assumed to be be "prepared" in calling function
511 // by "MUON->GetTreeR(nev)" ????
512 TTree *treeR = fLoader->TreeR();
513 fMUONData->SetTreeAddress("RC");
514 AddHitsForRecFromRawClusters(treeR);
515 // No sorting: it is done automatically in the previous function
517 if (fPrintLevel >= 10) {
518 cout << "end of MakeEventToBeReconstructed" << endl;
519 cout << "NHitsForRec: " << fNHitsForRec << endl;
520 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
521 cout << "chamber(0...): " << ch
522 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
523 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
525 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
526 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
528 cout << "HitForRec index(0...): " << hit << endl;
529 ((*fHitsForRecPtr)[hit])->Dump();
536 //__________________________________________________________________________
537 void AliMUONEventReconstructor::AddHitsForRecFromTrackRef(TTree *TTR, Int_t signal)
539 // To add to the list of hits for reconstruction
540 // the signal hits from a track reference tree TreeTR.
541 TClonesArray *listOfTrackRefs = NULL;
542 AliTrackReference *trackRef;
545 if (fPrintLevel >= 2)
546 cout << "enter AddHitsForRecFromTrackRef with TTR: " << TTR << endl;
547 if (TTR == NULL) return;
549 listOfTrackRefs = CleanTrackRefs(TTR);
551 Int_t ntracks = listOfTrackRefs->GetEntriesFast();
553 if (fPrintLevel >= 2)
554 cout << "ntracks: " << ntracks << endl;
556 for (Int_t index = 0; index < ntracks; index++) {
557 trackRef = (AliTrackReference*) listOfTrackRefs->At(index);
558 track = trackRef->GetTrack();
560 NewHitForRecFromTrackRef(trackRef,track,signal);
561 } // end of track ref.
563 listOfTrackRefs->Delete();
564 delete listOfTrackRefs;
569 //__________________________________________________________________________
570 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromTrackRef(AliTrackReference* Hit, Int_t TrackNumber, Int_t Signal)
572 // To make a new hit for reconstruction from a track ref. hit pointed to by "Hit",
573 // with the track numbered "TrackNumber",
574 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
575 // Selects hits in tracking (not trigger) chambers.
576 // Takes into account the efficiency (fEfficiency)
577 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
578 // Adds a condition on the radius between RMin and RMax
579 // to better simulate the real chambers.
580 // Returns the pointer to the new hit for reconstruction,
581 // or NULL in case of inefficiency or non tracking chamber or bad radius.
582 // No condition on at most 20 cm from a muon from a resonance
583 // like in Fortran TRACKF_STAT.
584 AliMUONHitForRec* hitForRec;
585 Double_t bendCoor, nonBendCoor, radius;
586 Int_t chamber = AliMUONConstants::ChamberNumber(Hit->Z()); // chamber(0...)
587 if (chamber < 0) return NULL;
588 // only in tracking chambers (fChamber starts at 1)
589 if (chamber >= fgkMaxMuonTrackingChambers) return NULL;
590 // only if hit is efficient (keep track for checking ????)
591 if (gRandom->Rndm() > fEfficiency) return NULL;
592 // only if radius between RMin and RMax
594 nonBendCoor = Hit->X();
595 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
596 // This cut is not needed with a realistic chamber geometry !!!!
597 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
598 // new AliMUONHitForRec from track ref. hit and increment number of AliMUONHitForRec's
599 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
601 // add smearing from resolution
602 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
603 hitForRec->SetNonBendingCoor(nonBendCoor
604 + gRandom->Gaus(0., fNonBendingResolution));
605 // // !!!! without smearing
606 // hitForRec->SetBendingCoor(bendCoor);
607 // hitForRec->SetNonBendingCoor(nonBendCoor);
608 // more information into HitForRec
609 // resolution: angular effect to be added here ????
610 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
611 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
613 hitForRec->SetTTRTrack(TrackNumber);
614 hitForRec->SetTrackRefSignal(Signal);
615 if (fPrintLevel >= 10) {
616 cout << "track: " << TrackNumber << endl;
618 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
622 //__________________________________________________________________________
623 TClonesArray* AliMUONEventReconstructor::CleanTrackRefs(TTree *treeTR)
625 // Make hits from track ref..
626 // Re-calculate hits parameters because two AliTrackReferences are recorded for
627 // each chamber (one when particle is entering + one when particle is leaving
628 // the sensitive volume)
630 AliTrackReference *trackReference;
631 Float_t x1, y1, z1, pX1, pY1, pZ1;
632 Float_t x2, y2, z2, pX2, pY2, pZ2;
633 Int_t track1, track2;
635 Float_t maxGasGap = 1.; // cm
639 AliTrackReference *trackReferenceNew = new AliTrackReference();
641 TClonesArray* trackRefs = new TClonesArray("AliTrackReference", 10);
642 TClonesArray* cleanTrackRefs = new TClonesArray("AliTrackReference", 10);
644 if (treeTR == NULL) return NULL;
645 TBranch* branch = treeTR->GetBranch("MUON");
646 if (branch == NULL) return NULL;
647 branch->SetAddress(&trackRefs);
649 Int_t nTrack = (Int_t)treeTR->GetEntries();
650 for (Int_t iTrack = 0; iTrack < nTrack; iTrack++) {
651 treeTR->GetEntry(iTrack);
654 while (iHit1 < trackRefs->GetEntries()) {
655 trackReference = (AliTrackReference*)trackRefs->At(iHit1);
656 x1 = trackReference->X();
657 y1 = trackReference->Y();
658 z1 = trackReference->Z();
659 pX1 = trackReference->Px();
660 pY1 = trackReference->Py();
661 pZ1 = trackReference->Pz();
662 track1 = trackReference->GetTrack();
665 for (Int_t iHit2 = iHit1+1; iHit2 < trackRefs->GetEntries(); iHit2++) {
666 trackReference = (AliTrackReference*)trackRefs->At(iHit2);
667 x2 = trackReference->X();
668 y2 = trackReference->Y();
669 z2 = trackReference->Z();
670 pX2 = trackReference->Px();
671 pY2 = trackReference->Py();
672 pZ2 = trackReference->Pz();
673 track2 = trackReference->GetTrack();
674 if (track2 == track1 && TMath::Abs(z2-z1) < maxGasGap ) {
689 pX1 /= (Float_t)nRec;
690 pY1 /= (Float_t)nRec;
691 pZ1 /= (Float_t)nRec;
692 trackReferenceNew->SetPosition(x1,y1,z1);
693 trackReferenceNew->SetMomentum(pX1,pY1,pZ1);
694 trackReferenceNew->SetTrack(track1);
695 {new ((*cleanTrackRefs)[cleanTrackRefs->GetEntriesFast()]) AliTrackReference(*trackReferenceNew);}
702 delete trackReferenceNew;
703 return cleanTrackRefs;
706 //__________________________________________________________________________
707 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
709 // Sort HitsForRec's in increasing order with respect to chamber number.
710 // Uses the function "Compare".
711 // Update the information for HitsForRec per chamber too.
712 Int_t ch, nhits, prevch;
713 fHitsForRecPtr->Sort();
714 for (ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
715 fNHitsForRecPerChamber[ch] = 0;
716 fIndexOfFirstHitForRecPerChamber[ch] = 0;
718 prevch = 0; // previous chamber
719 nhits = 0; // number of hits in current chamber
720 // Loop over HitsForRec
721 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
722 // chamber number (0...)
723 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
724 // increment number of hits in current chamber
725 (fNHitsForRecPerChamber[ch])++;
726 // update index of first HitForRec in current chamber
727 // if chamber number different from previous one
729 fIndexOfFirstHitForRecPerChamber[ch] = hit;
736 // //__________________________________________________________________________
737 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
739 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
740 // // To add to the list of hits for reconstruction
741 // // the (cathode correlated) raw clusters
742 // // No condition added, like in Fortran TRACKF_STAT,
743 // // on the radius between RMin and RMax.
744 // AliMUONHitForRec *hitForRec;
745 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
746 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
747 // // Security on MUON ????
748 // // Loop over tracking chambers
749 // for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
750 // // number of HitsForRec to 0 for the chamber
751 // fNHitsForRecPerChamber[ch] = 0;
752 // // index of first HitForRec for the chamber
753 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
754 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
755 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
756 // MUON->ResetReconstHits();
758 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
759 // // Loop over (cathode correlated) raw clusters
760 // for (Int_t cor = 0; cor < ncor; cor++) {
761 // AliMUONReconstHit * mCor =
762 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
763 // // new AliMUONHitForRec from (cathode correlated) raw cluster
764 // // and increment number of AliMUONHitForRec's (total and in chamber)
765 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
767 // (fNHitsForRecPerChamber[ch])++;
768 // // more information into HitForRec
769 // hitForRec->SetChamberNumber(ch);
770 // hitForRec->SetHitNumber(cor);
771 // // Z coordinate of the chamber (cm) with sign opposite to TRACKREF sign
772 // // could (should) be more exact from chamber geometry ????
773 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
774 // if (fPrintLevel >= 10) {
775 // cout << "chamber (0...): " << ch <<
776 // " cathcorrel (0...): " << cor << endl;
778 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
779 // hitForRec->Dump();}
780 // } // end of cluster loop
781 // } // end of chamber loop
785 //__________________________________________________________________________
786 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
788 // To add to the list of hits for reconstruction all the raw clusters
789 // No condition added, like in Fortran TRACKF_STAT,
790 // on the radius between RMin and RMax.
791 AliMUONHitForRec *hitForRec;
792 AliMUONRawCluster *clus;
793 Int_t iclus, nclus, nTRentries;
794 TClonesArray *rawclusters;
795 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
797 // TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
798 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
801 // Error("MakeEventToBeReconstructed",
802 // "Can not find Run Loader in Event Folder named %s.",
803 // evfoldname.Data());
806 // AliLoader* gime = rl->GetLoader("MUONLoader");
809 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
812 // // Loading AliRun master
814 // gAlice = rl->GetAliRun();
816 // Loading MUON subsystem
817 // AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
819 nTRentries = Int_t(TR->GetEntries());
820 if (nTRentries != 1) {
821 AliError(Form("nTRentries = %d not equal to 1 ",nTRentries));
824 fLoader->TreeR()->GetEvent(0); // only one entry
826 // Loop over tracking chambers
827 for (Int_t ch = 0; ch < fgkMaxMuonTrackingChambers; ch++) {
828 // number of HitsForRec to 0 for the chamber
829 fNHitsForRecPerChamber[ch] = 0;
830 // index of first HitForRec for the chamber
831 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
832 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
833 rawclusters =fMUONData->RawClusters(ch);
834 // pMUON->ResetRawClusters();
835 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
836 nclus = (Int_t) (rawclusters->GetEntries());
837 // Loop over (cathode correlated) raw clusters
838 for (iclus = 0; iclus < nclus; iclus++) {
839 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
840 // new AliMUONHitForRec from raw cluster
841 // and increment number of AliMUONHitForRec's (total and in chamber)
842 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
844 (fNHitsForRecPerChamber[ch])++;
845 // more information into HitForRec
846 // resolution: info should be already in raw cluster and taken from it ????
847 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
848 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
849 // original raw cluster
850 hitForRec->SetChamberNumber(ch);
851 hitForRec->SetHitNumber(iclus);
852 // Z coordinate of the raw cluster (cm)
853 hitForRec->SetZ(clus->GetZ(0));
854 if (fPrintLevel >= 10) {
855 cout << "chamber (0...): " << ch <<
856 " raw cluster (0...): " << iclus << endl;
858 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
860 } // end of cluster loop
861 } // end of chamber loop
862 SortHitsForRecWithIncreasingChamber(); //AZ
866 //__________________________________________________________________________
867 void AliMUONEventReconstructor::MakeSegments(void)
869 // To make the list of segments in all stations,
870 // from the list of hits to be reconstructed
871 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
873 // Loop over stations
874 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
875 //AZ for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++)
876 for (Int_t st = nb; st < fgkMaxMuonTrackingStations; st++) //AZ
877 MakeSegmentsPerStation(st);
878 if (fPrintLevel >= 10) {
879 cout << "end of MakeSegments" << endl;
880 for (Int_t st = 0; st < fgkMaxMuonTrackingStations; st++) {
881 cout << "station(0...): " << st
882 << " Segments: " << fNSegments[st]
885 seg < fNSegments[st];
887 cout << "Segment index(0...): " << seg << endl;
888 ((*fSegmentsPtr[st])[seg])->Dump();
895 //__________________________________________________________________________
896 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
898 // To make the list of segments in station number "Station" (0...)
899 // from the list of hits to be reconstructed.
900 // Updates "fNSegments"[Station].
901 // Segments in stations 4 and 5 are sorted
902 // according to increasing absolute value of "impact parameter"
903 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
904 AliMUONSegment *segment;
906 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
907 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
908 if (fPrintLevel >= 1)
909 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
910 // first and second chambers (0...) in the station
911 Int_t ch1 = 2 * Station;
913 // variable true for stations downstream of the dipole:
914 // Station(0..4) equal to 3 or 4
915 if ((Station == 3) || (Station == 4)) {
917 // maximum impact parameter (cm) according to fMinBendingMomentum...
919 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
920 // minimum impact parameter (cm) according to fMaxBendingMomentum...
922 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
924 else last2st = kFALSE;
925 // extrapolation factor from Z of first chamber to Z of second chamber
926 // dZ to be changed to take into account fine structure of chambers ????
928 // index for current segment
929 Int_t segmentIndex = 0;
930 // Loop over HitsForRec in the first chamber of the station
931 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
932 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
934 // pointer to the HitForRec
935 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
937 // on the straight line joining the HitForRec to the vertex (0,0,0),
938 // to the Z of the second chamber of the station
939 // Loop over HitsForRec in the second chamber of the station
940 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
941 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
943 // pointer to the HitForRec
944 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
945 // absolute values of distances, in bending and non bending planes,
946 // between the HitForRec in the second chamber
947 // and the previous extrapolation
948 extrapFact = hit2Ptr->GetZ()/ hit1Ptr->GetZ();
949 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
950 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
951 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
952 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
955 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
956 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
957 // absolute value of impact parameter
959 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
961 // check for distances not too large,
962 // and impact parameter not too big if stations downstream of the dipole.
963 // Conditions "distBend" and "impactParam" correlated for these stations ????
964 if ((distBend < fSegmentMaxDistBending[Station]) &&
965 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
966 (!last2st || (impactParam < maxImpactParam)) &&
967 (!last2st || (impactParam > minImpactParam))) {
969 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
970 AliMUONSegment(hit1Ptr, hit2Ptr);
971 // update "link" to this segment from the hit in the first chamber
972 if (hit1Ptr->GetNSegments() == 0)
973 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
974 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
975 if (fPrintLevel >= 10) {
976 cout << "segmentIndex(0...): " << segmentIndex
977 << " distBend: " << distBend
978 << " distNonBend: " << distNonBend
981 cout << "HitForRec in first chamber" << endl;
983 cout << "HitForRec in second chamber" << endl;
986 // increment index for current segment
990 } // for (Int_t hit1...
991 fNSegments[Station] = segmentIndex;
992 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
993 // i.e. Station(0..4) 3 or 4, using the function "Compare".
994 // After this sorting, it is impossible to use
995 // the "fNSegments" and "fIndexOfFirstSegment"
996 // of the HitForRec in the first chamber to explore all segments formed with it.
997 // Is this sorting really needed ????
998 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
999 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
1000 << fNSegments[Station] << endl;
1004 //__________________________________________________________________________
1005 void AliMUONEventReconstructor::MakeTracks(void)
1007 // To make the tracks,
1008 // from the list of segments and points in all stations
1009 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
1010 // The order may be important for the following Reset's
1013 if (fTrackMethod == 2) { //AZ - Kalman filter
1014 MakeTrackCandidatesK();
1015 if (fRecTracksPtr->GetEntriesFast() == 0) return;
1016 // Follow tracks in stations(1..) 3, 2 and 1
1018 // Remove double tracks
1019 RemoveDoubleTracksK();
1020 // Propagate tracks to the vertex thru absorber
1022 // Fill AliMUONTrack data members
1025 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
1026 MakeTrackCandidates();
1027 // Follow tracks in stations(1..) 3, 2 and 1
1029 // Remove double tracks
1030 RemoveDoubleTracks();
1031 UpdateTrackParamAtHit();
1032 UpdateHitForRecAtHit();
1037 //__________________________________________________________________________
1038 void AliMUONEventReconstructor::ValidateTracksWithTrigger(void)
1040 // Try to match track from tracking system with trigger track
1041 AliMUONTrack *track;
1042 TClonesArray *recTriggerTracks;
1044 fMUONData->ResetRecTriggerTracks();
1045 fMUONData->SetTreeAddress("RL");
1046 fMUONData->GetRecTriggerTracks();
1047 recTriggerTracks = fMUONData->RecTriggerTracks();
1049 track = (AliMUONTrack*) fRecTracksPtr->First();
1051 track->MatchTriggerTrack(recTriggerTracks);
1052 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1057 //__________________________________________________________________________
1058 Bool_t AliMUONEventReconstructor::MakeTriggerTracks(void)
1060 // To make the trigger tracks from Local Trigger
1061 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
1062 // ResetTriggerTracks();
1066 TClonesArray *localTrigger;
1067 TClonesArray *globalTrigger;
1068 AliMUONLocalTrigger *locTrg;
1069 AliMUONGlobalTrigger *gloTrg;
1070 AliMUONTriggerCircuit *circuit;
1071 AliMUONTriggerTrack *recTriggerTrack = 0;
1073 TTree* treeR = fLoader->TreeR();
1075 // Loading MUON subsystem
1076 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1078 nTRentries = Int_t(treeR->GetEntries());
1080 treeR->GetEvent(0); // only one entry
1082 if (!(fMUONData->IsTriggerBranchesInTree())) {
1083 AliWarning(Form("Trigger information is not avalaible, nTRentries = %d not equal to 1",nTRentries));
1087 fMUONData->SetTreeAddress("TC");
1088 fMUONData->GetTrigger();
1090 // global trigger for trigger pattern
1092 globalTrigger = fMUONData->GlobalTrigger();
1093 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1095 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1096 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1097 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1099 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1100 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1101 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1103 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1104 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1105 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1107 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1108 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1109 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1111 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1112 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1113 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1118 // local trigger for tracking
1119 localTrigger = fMUONData->LocalTrigger();
1120 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1121 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1122 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1124 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1125 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1126 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1127 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1128 Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
1129 Float_t y21 = circuit->GetY21Pos(stripX21);
1130 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1131 Float_t thetax = TMath::ATan2( x11 , z11 );
1132 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1134 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1135 // since static statement does not work, set gloTrigPat for each track
1137 // fNRecTriggerTracks++;
1138 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
1139 } // end of loop on Local Trigger
1143 //__________________________________________________________________________
1144 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1146 // To make track candidates with two segments in stations(1..) 4 and 5,
1147 // the first segment being pointed to by "BegSegment".
1148 // Returns the number of such track candidates.
1149 Int_t endStation, iEndSegment, nbCan2Seg;
1150 AliMUONSegment *endSegment;
1151 AliMUONSegment *extrapSegment = NULL;
1152 AliMUONTrack *recTrack;
1154 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1155 // Station for the end segment
1156 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1157 // multiple scattering factor corresponding to one chamber
1158 mcsFactor = 0.0136 /
1159 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1160 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1161 // linear extrapolation to end station
1162 // number of candidates with 2 segments to 0
1164 // Loop over segments in the end station
1165 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1166 // pointer to segment
1167 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1168 // test compatibility between current segment and "extrapSegment"
1169 // 4 because 4 quantities in chi2
1171 BegSegment->CreateSegmentFromLinearExtrapToStation(endSegment->GetZ(), mcsFactor);
1173 NormalizedChi2WithSegment(extrapSegment,
1174 fMaxSigma2Distance)) <= 4.0) {
1175 // both segments compatible:
1176 // make track candidate from "begSegment" and "endSegment"
1177 if (fPrintLevel >= 2)
1178 cout << "TrackCandidate with Segment " << iEndSegment <<
1179 " in Station(0..) " << endStation << endl;
1180 // flag for both segments in one track:
1181 // to be done in track constructor ????
1182 BegSegment->SetInTrack(kTRUE);
1183 endSegment->SetInTrack(kTRUE);
1184 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1185 AliMUONTrack(BegSegment, endSegment, this);
1187 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1188 // increment number of track candidates with 2 segments
1191 } // for (iEndSegment = 0;...
1192 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1196 //__________________________________________________________________________
1197 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1199 // To make track candidates with one segment and one point
1200 // in stations(1..) 4 and 5,
1201 // the segment being pointed to by "BegSegment".
1202 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1203 AliMUONHitForRec *extrapHitForRec= NULL;
1204 AliMUONHitForRec *hit;
1205 AliMUONTrack *recTrack;
1207 if (fPrintLevel >= 1)
1208 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1209 // station for the end point
1210 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1211 // multiple scattering factor corresponding to one chamber
1212 mcsFactor = 0.0136 /
1213 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1214 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1215 // first and second chambers(0..) in the end station
1216 ch1 = 2 * endStation;
1218 // number of candidates to 0
1220 // Loop over chambers of the end station
1221 for (ch = ch2; ch >= ch1; ch--) {
1222 // limits for the hit index in the loop
1223 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1224 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1225 // Loop over HitForRec's in the chamber
1226 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1227 // pointer to HitForRec
1228 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1229 // test compatibility between current HitForRec and "extrapHitForRec"
1230 // 2 because 2 quantities in chi2
1231 // linear extrapolation to chamber
1233 BegSegment->CreateHitForRecFromLinearExtrapToChamber( hit->GetZ(), mcsFactor);
1235 NormalizedChi2WithHitForRec(extrapHitForRec,
1236 fMaxSigma2Distance)) <= 2.0) {
1237 // both HitForRec's compatible:
1238 // make track candidate from begSegment and current HitForRec
1239 if (fPrintLevel >= 2)
1240 cout << "TrackCandidate with HitForRec " << iHit <<
1241 " in Chamber(0..) " << ch << endl;
1242 // flag for beginning segments in one track:
1243 // to be done in track constructor ????
1244 BegSegment->SetInTrack(kTRUE);
1245 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1246 AliMUONTrack(BegSegment, hit, this);
1247 // the right place to eliminate "double counting" ???? how ????
1249 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1250 // increment number of track candidates
1253 } // for (iHit = iHitMin;...
1254 delete extrapHitForRec;
1255 extrapHitForRec = NULL;
1256 } // for (ch = ch2;...
1257 return nbCan1Seg1Hit;
1260 //__________________________________________________________________________
1261 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1263 // To make track candidates
1264 // with at least 3 aligned points in stations(1..) 4 and 5
1265 // (two Segment's or one Segment and one HitForRec)
1266 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1267 AliMUONSegment *begSegment;
1268 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1269 // Loop over stations(1..) 5 and 4 for the beginning segment
1270 for (begStation = 4; begStation > 2; begStation--) {
1271 // Loop over segments in the beginning station
1272 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1273 // pointer to segment
1274 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1275 if (fPrintLevel >= 2)
1276 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1277 " in Station(0..) " << begStation << endl;
1278 // Look for track candidates with two segments,
1279 // "begSegment" and all compatible segments in other station.
1280 // Only for beginning station(1..) 5
1281 // because candidates with 2 segments have to looked for only once.
1282 if (begStation == 4)
1283 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1284 // Look for track candidates with one segment and one point,
1285 // "begSegment" and all compatible HitForRec's in other station.
1286 // Only if "begSegment" does not belong already to a track candidate.
1287 // Is that a too strong condition ????
1288 if (!(begSegment->GetInTrack()))
1289 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1290 } // for (iBegSegment = 0;...
1291 } // for (begStation = 4;...
1295 //__________________________________________________________________________
1296 void AliMUONEventReconstructor::FollowTracks(void)
1298 // Follow tracks in stations(1..) 3, 2 and 1
1299 // too long: should be made more modular !!!!
1300 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1301 AliMUONSegment *bestSegment, *extrapSegment, *segment;
1302 AliMUONTrack *track, *nextTrack;
1303 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1304 // -1 to avoid compilation warnings
1305 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1306 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1307 Double_t bendingMomentum, chi2Norm = 0.;
1308 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1309 // local maxSigma2Distance, for easy increase in testing
1310 maxSigma2Distance = fMaxSigma2Distance;
1311 if (fPrintLevel >= 2)
1312 cout << "enter FollowTracks" << endl;
1313 // Loop over track candidates
1314 track = (AliMUONTrack*) fRecTracksPtr->First();
1317 // Follow function for each track candidate ????
1319 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1320 if (fPrintLevel >= 2)
1321 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1322 // Fit track candidate
1323 track->SetFitMCS(0); // without multiple Coulomb scattering
1324 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1325 track->SetFitStart(0); // from parameters at vertex
1327 if (fPrintLevel >= 10) {
1328 cout << "FollowTracks: track candidate(0..): " << trackIndex
1329 << " after fit in stations(0..) 3 and 4" << endl;
1330 track->RecursiveDump();
1332 // Loop over stations(1..) 3, 2 and 1
1333 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1334 // otherwise: majority coincidence 2 !!!!
1335 for (station = 2; station >= 0; station--) {
1336 // Track parameters at first track hit (smallest Z)
1337 trackParam1 = ((AliMUONTrackHit*)
1338 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1339 // extrapolation to station
1340 trackParam1->ExtrapToStation(station, trackParam);
1341 extrapSegment = new AliMUONSegment(); // empty segment
1342 // multiple scattering factor corresponding to one chamber
1343 // and momentum in bending plane (not total)
1344 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1345 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1346 // Z difference from previous station
1347 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1348 (&(pMUON->Chamber(2 * station + 2)))->Z();
1349 // Z difference between the two previous stations
1350 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1351 (&(pMUON->Chamber(2 * station + 4)))->Z();
1352 // Z difference between the two chambers in the previous station
1353 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1354 (&(pMUON->Chamber(2 * station + 1)))->Z();
1355 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1357 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1358 extrapSegment->UpdateFromStationTrackParam
1359 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1360 trackParam1->GetInverseBendingMomentum());
1363 if (fPrintLevel >= 10) {
1364 cout << "FollowTracks: track candidate(0..): " << trackIndex
1365 << " Look for segment in station(0..): " << station << endl;
1367 // Loop over segments in station
1368 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1369 // Look for best compatible Segment in station
1370 // should consider all possibilities ????
1371 // multiple scattering ????
1372 // separation in 2 functions: Segment and HitForRec ????
1373 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1374 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1375 // according to real Z value of "segment" and slopes of "extrapSegment"
1376 (&(trackParam[0]))->ExtrapToZ(segment->GetZ());
1377 (&(trackParam[1]))->ExtrapToZ(segment->GetZ());
1378 extrapSegment->SetBendingCoor((&(trackParam[0]))->GetBendingCoor());
1379 extrapSegment->SetNonBendingCoor((&(trackParam[0]))->GetNonBendingCoor());
1380 extrapSegment->SetBendingSlope((&(trackParam[0]))->GetBendingSlope());
1381 extrapSegment->SetNonBendingSlope((&(trackParam[0]))->GetNonBendingSlope());
1383 NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1384 if (chi2 < bestChi2) {
1385 // update best Chi2 and Segment if better found
1386 bestSegment = segment;
1391 // best segment found: add it to track candidate
1392 (&(trackParam[0]))->ExtrapToZ(bestSegment->GetZ());
1393 (&(trackParam[1]))->ExtrapToZ(bestSegment->GetZ());
1394 track->AddSegment(bestSegment);
1395 // set track parameters at these two TrakHit's
1396 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1397 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1398 if (fPrintLevel >= 10) {
1399 cout << "FollowTracks: track candidate(0..): " << trackIndex
1400 << " Added segment in station(0..): " << station << endl;
1401 track->RecursiveDump();
1405 // No best segment found:
1406 // Look for best compatible HitForRec in station:
1407 // should consider all possibilities ????
1408 // multiple scattering ???? do about like for extrapSegment !!!!
1409 extrapHit = new AliMUONHitForRec(); // empty hit
1412 if (fPrintLevel >= 10) {
1413 cout << "FollowTracks: track candidate(0..): " << trackIndex
1414 << " Segment not found, look for hit in station(0..): " << station
1417 // Loop over chambers of the station
1418 for (chInStation = 0; chInStation < 2; chInStation++) {
1419 ch = 2 * station + chInStation;
1420 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1421 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1422 fNHitsForRecPerChamber[ch];
1424 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1425 // coordinates of extrapolated hit
1426 (&(trackParam[chInStation]))->ExtrapToZ(hit->GetZ());
1428 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1430 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1431 // resolutions from "extrapSegment"
1432 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1433 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1434 // Loop over hits in the chamber
1435 // condition for hit not already in segment ????
1436 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1437 if (chi2 < bestChi2) {
1438 // update best Chi2 and HitForRec if better found
1441 chBestHit = chInStation;
1446 // best hit found: add it to track candidate
1447 (&(trackParam[chBestHit]))->ExtrapToZ(bestHit->GetZ());
1448 track->AddHitForRec(bestHit);
1449 // set track parameters at this TrackHit
1450 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1451 &(trackParam[chBestHit]));
1452 if (fPrintLevel >= 10) {
1453 cout << "FollowTracks: track candidate(0..): " << trackIndex
1454 << " Added hit in station(0..): " << station << endl;
1455 track->RecursiveDump();
1459 // Remove current track candidate
1460 // and corresponding TrackHit's, ...
1462 delete extrapSegment;
1464 break; // stop the search for this candidate:
1465 // exit from the loop over station
1469 delete extrapSegment;
1470 // Sort track hits according to increasing Z
1471 track->GetTrackHitsPtr()->Sort();
1472 // Update track parameters at first track hit (smallest Z)
1473 trackParam1 = ((AliMUONTrackHit*)
1474 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1475 bendingMomentum = 0.;
1476 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1477 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1478 // Track removed if bendingMomentum not in window [min, max]
1479 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1481 break; // stop the search for this candidate:
1482 // exit from the loop over station
1485 // with multiple Coulomb scattering if all stations
1486 if (station == 0) track->SetFitMCS(1);
1487 // without multiple Coulomb scattering if not all stations
1488 else track->SetFitMCS(0);
1489 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1490 track->SetFitStart(1); // from parameters at first hit
1492 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1493 if (numberOfDegFree > 0) {
1494 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1498 // Track removed if normalized chi2 too high
1499 if (chi2Norm > fMaxChi2) {
1501 break; // stop the search for this candidate:
1502 // exit from the loop over station
1504 if (fPrintLevel >= 10) {
1505 cout << "FollowTracks: track candidate(0..): " << trackIndex
1506 << " after fit from station(0..): " << station << " to 4" << endl;
1507 track->RecursiveDump();
1509 // Track extrapolation to the vertex through the absorber (Branson)
1510 // after going through the first station
1512 trackParamVertex = *trackParam1;
1513 (&trackParamVertex)->ExtrapToVertex(0.,0.,0.);
1514 track->SetTrackParamAtVertex(&trackParamVertex);
1515 if (fPrintLevel >= 1) {
1516 cout << "FollowTracks: track candidate(0..): " << trackIndex
1517 << " after extrapolation to vertex" << endl;
1518 track->RecursiveDump();
1521 } // for (station = 2;...
1522 // go really to next track
1525 // Compression of track array (necessary after Remove ????)
1526 fRecTracksPtr->Compress();
1530 //__________________________________________________________________________
1531 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1533 // To remove double tracks.
1534 // Tracks are considered identical
1535 // if they have at least half of their hits in common.
1536 // Among two identical tracks, one keeps the track with the larger number of hits
1537 // or, if these numbers are equal, the track with the minimum Chi2.
1538 AliMUONTrack *track1, *track2, *trackToRemove;
1539 Bool_t identicalTracks;
1540 Int_t hitsInCommon, nHits1, nHits2;
1541 identicalTracks = kTRUE;
1542 while (identicalTracks) {
1543 identicalTracks = kFALSE;
1544 // Loop over first track of the pair
1545 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1546 while (track1 && (!identicalTracks)) {
1547 nHits1 = track1->GetNTrackHits();
1548 // Loop over second track of the pair
1549 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1550 while (track2 && (!identicalTracks)) {
1551 nHits2 = track2->GetNTrackHits();
1552 // number of hits in common between two tracks
1553 hitsInCommon = track1->HitsInCommon(track2);
1554 // check for identical tracks
1555 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1556 identicalTracks = kTRUE;
1557 // decide which track to remove
1558 if (nHits1 > nHits2) trackToRemove = track2;
1559 else if (nHits1 < nHits2) trackToRemove = track1;
1560 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1561 trackToRemove = track2;
1562 else trackToRemove = track1;
1564 trackToRemove->Remove();
1566 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1568 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1574 //__________________________________________________________________________
1575 void AliMUONEventReconstructor::UpdateTrackParamAtHit()
1577 // Set track parameters after track fitting. Fill fTrackParamAtHit of AliMUONTrack's
1578 AliMUONTrack *track;
1579 AliMUONTrackHit *trackHit;
1580 AliMUONTrackParam *trackParam;
1581 track = (AliMUONTrack*) fRecTracksPtr->First();
1583 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1585 trackParam = trackHit->GetTrackParam();
1586 track->AddTrackParamAtHit(trackParam);
1587 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1589 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1594 //__________________________________________________________________________
1595 void AliMUONEventReconstructor::UpdateHitForRecAtHit()
1597 // Set cluster parameterss after track fitting. Fill fHitForRecAtHit of AliMUONTrack's
1598 AliMUONTrack *track;
1599 AliMUONTrackHit *trackHit;
1600 AliMUONHitForRec *hitForRec;
1601 track = (AliMUONTrack*) fRecTracksPtr->First();
1603 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1605 hitForRec = trackHit->GetHitForRecPtr();
1606 track->AddHitForRecAtHit(hitForRec);
1607 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1609 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1614 //__________________________________________________________________________
1615 void AliMUONEventReconstructor::FillMUONTrack()
1617 // Set track parameters at hits for Kalman track. Fill fTrackParamAtHit of AliMUONTrack's
1618 AliMUONTrackK *track;
1619 track = (AliMUONTrackK*) fRecTracksPtr->First();
1621 track->FillMUONTrack();
1622 track = (AliMUONTrackK*) fRecTracksPtr->After(track);
1627 //__________________________________________________________________________
1628 void AliMUONEventReconstructor::EventDump(void)
1630 // Dump reconstructed event (track parameters at vertex and at first hit),
1631 // and the particle parameters
1633 AliMUONTrack *track;
1634 AliMUONTrackParam *trackParam, *trackParam1;
1635 Double_t bendingSlope, nonBendingSlope, pYZ;
1636 Double_t pX, pY, pZ, x, y, z, c;
1637 Int_t np, trackIndex, nTrackHits;
1639 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1640 if (fPrintLevel >= 1) {
1641 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1643 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1644 // Loop over reconstructed tracks
1645 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1646 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1647 if (fPrintLevel >= 1)
1648 cout << " track number: " << trackIndex << endl;
1649 // function for each track for modularity ????
1650 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1651 nTrackHits = track->GetNTrackHits();
1652 if (fPrintLevel >= 1)
1653 cout << " number of track hits: " << nTrackHits << endl;
1654 // track parameters at Vertex
1655 trackParam = track->GetTrackParamAtVertex();
1656 x = trackParam->GetNonBendingCoor();
1657 y = trackParam->GetBendingCoor();
1658 z = trackParam->GetZ();
1659 bendingSlope = trackParam->GetBendingSlope();
1660 nonBendingSlope = trackParam->GetNonBendingSlope();
1661 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1662 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1663 pX = pZ * nonBendingSlope;
1664 pY = pZ * bendingSlope;
1665 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1666 if (fPrintLevel >= 1)
1667 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1668 z, x, y, pX, pY, pZ, c);
1670 // track parameters at first hit
1671 trackParam1 = ((AliMUONTrackHit*)
1672 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1673 x = trackParam1->GetNonBendingCoor();
1674 y = trackParam1->GetBendingCoor();
1675 z = trackParam1->GetZ();
1676 bendingSlope = trackParam1->GetBendingSlope();
1677 nonBendingSlope = trackParam1->GetNonBendingSlope();
1678 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1679 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1680 pX = pZ * nonBendingSlope;
1681 pY = pZ * bendingSlope;
1682 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1683 if (fPrintLevel >= 1)
1684 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1685 z, x, y, pX, pY, pZ, c);
1687 // informations about generated particles
1688 np = gAlice->GetMCApp()->GetNtrack();
1689 printf(" **** number of generated particles: %d \n", np);
1691 // for (Int_t iPart = 0; iPart < np; iPart++) {
1692 // p = gAlice->Particle(iPart);
1693 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1694 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1700 //__________________________________________________________________________
1701 void AliMUONEventReconstructor::EventDumpTrigger(void)
1703 // Dump reconstructed trigger event
1704 // and the particle parameters
1706 AliMUONTriggerTrack *triggertrack ;
1707 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
1709 if (fPrintLevel >= 1) {
1710 cout << "****** enter EventDumpTrigger ******" << endl;
1711 cout << " Number of Reconstructed tracks :" << nTriggerTracks << endl;
1713 // Loop over reconstructed tracks
1714 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1715 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
1716 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1718 triggertrack->GetX11(),triggertrack->GetY11(),
1719 triggertrack->GetThetax(),triggertrack->GetThetay());
1723 //__________________________________________________________________________
1724 void AliMUONEventReconstructor::FillEvent()
1726 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1727 // leaf in the Event branch of TreeRecoEvent tree
1728 cout << "Enter FillEvent() ...\n";
1731 fRecoEvent = new AliMUONRecoEvent();
1733 fRecoEvent->Clear();
1735 //save current directory
1736 TDirectory *current = gDirectory;
1737 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1738 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1739 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1740 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1741 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1742 TBranch *branch = fEventTree->GetBranch("Event");
1743 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1744 branch->SetAutoDelete();
1749 // restore directory
1753 //__________________________________________________________________________
1754 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1756 // To make initial tracks for Kalman filter from the list of segments
1758 AliMUONSegment *segment;
1759 AliMUONTrackK *trackK;
1761 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1762 // Reset the TClonesArray of reconstructed tracks
1763 if (fRecTracksPtr) fRecTracksPtr->Delete();
1764 // Delete in order that the Track destructors are called,
1765 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1768 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1769 // Loop over stations(1...) 5 and 4
1770 for (istat=4; istat>=3; istat--) {
1771 // Loop over segments in the station
1772 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1773 // Transform segments to tracks and evaluate covariance matrix
1774 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1775 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1777 } // for (iseg=0;...)
1778 } // for (istat=4;...)
1782 //__________________________________________________________________________
1783 void AliMUONEventReconstructor::FollowTracksK(void)
1785 // Follow tracks using Kalman filter
1787 Int_t icand, ichamBeg = 0, ichamEnd, chamBits;
1788 Double_t zDipole1, zDipole2;
1789 AliMUONTrackK *trackK;
1790 AliMUONHitForRec *hit;
1791 AliMUONRawCluster *clus;
1792 TClonesArray *rawclusters;
1793 clus = 0; rawclusters = 0;
1795 //AZ(z->-z) zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1796 //AZ(z->-z) zDipole2 = zDipole1 + GetSimpleBLength();
1797 zDipole1 = GetSimpleBPosition() + GetSimpleBLength()/2;
1798 zDipole2 = zDipole1 - GetSimpleBLength();
1801 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[0]);
1802 if (trackK->DebugLevel() > 0) {
1803 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1804 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1805 //if (hit->GetTTRTrack() > 1 || hit->GetTrackRefSignal() == 0) continue;
1806 printf(" Hit # %d %10.4f %10.4f %10.4f",
1807 hit->GetChamberNumber(), hit->GetBendingCoor(),
1808 hit->GetNonBendingCoor(), hit->GetZ());
1809 if (fRecTrackRefHits) {
1810 // from track ref hits
1811 printf(" %3d %3d \n", hit->GetTrackRefSignal(), hit->GetTTRTrack());
1813 // from raw clusters
1814 rawclusters = fMUONData->RawClusters(hit->GetChamberNumber());
1815 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1817 printf("%3d", clus->GetTrack(1)-1);
1818 if (clus->GetTrack(2) != 0) printf("%3d \n", clus->GetTrack(2)-1);
1820 } // if (fRecTrackRefHits)
1822 } // if (trackK->DebugLevel() > 0)
1826 nSeeds = fNRecTracks; // starting number of seeds
1827 // Loop over track candidates
1828 while (icand < fNRecTracks-1) {
1830 if (trackK->DebugLevel()>0) cout << " *** Kalman track candidate No. " << icand << endl;
1831 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1832 if (trackK->GetRecover() < 0) continue; // failed track
1834 // Discard candidate which will produce the double track
1837 ok = CheckCandidateK(icand,nSeeds);
1839 trackK->SetRecover(-1); // mark candidate to be removed
1846 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1847 trackK->GetHitOnTrack()->Last(); // last hit
1848 //else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1849 else hit = trackK->GetHitLastOk(); // hit where track stopped
1850 if (hit) ichamBeg = hit->GetChamberNumber();
1852 // Check propagation direction
1853 if (hit == NULL) ichamBeg = ichamEnd;
1854 //AZ(z->-z) else if (trackK->GetTrackDir() > 0) {
1855 else if (trackK->GetTrackDir() < 0) {
1856 ichamEnd = 9; // forward propagation
1857 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1859 ichamBeg = ichamEnd;
1860 ichamEnd = 6; // backward propagation
1861 // Change weight matrix and zero fChi2 for backpropagation
1862 trackK->StartBack();
1863 //AZ trackK->SetTrackDir(-1);
1864 trackK->SetTrackDir(1);
1865 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1866 ichamBeg = ichamEnd;
1870 if (trackK->GetBPFlag()) {
1872 ichamEnd = 6; // backward propagation
1873 // Change weight matrix and zero fChi2 for backpropagation
1874 trackK->StartBack();
1875 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1876 ichamBeg = ichamEnd;
1882 //AZ trackK->SetTrackDir(-1);
1883 trackK->SetTrackDir(1);
1884 trackK->SetBPFlag(kFALSE);
1885 ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1887 if (!ok) { trackK->SetRecover(-1); continue; } // mark candidate to be removed
1890 if (trackK->GetRecover() >= 0) {
1891 ok = trackK->Smooth();
1892 if (!ok) trackK->SetRecover(-1); // mark candidate to be removed
1895 // Majority 3 of 4 in first 2 stations
1898 Double_t chi2_max = 0;
1899 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1900 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1901 chamBits |= BIT(hit->GetChamberNumber());
1902 if (trackK->GetChi2PerPoint(i) > chi2_max) chi2_max = trackK->GetChi2PerPoint(i);
1904 if (!((chamBits&3)==3 || (chamBits>>2&3)==3) && chi2_max > 25) {
1905 //trackK->Recover();
1906 trackK->SetRecover(-1); //mark candidate to be removed
1909 if (ok) trackK->SetTrackQuality(0); // compute "track quality"
1912 for (Int_t i=0; i<fNRecTracks; i++) {
1913 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1914 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1917 // Compress TClonesArray
1918 fRecTracksPtr->Compress();
1919 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1923 //__________________________________________________________________________
1924 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds) const
1926 // Discards track candidate if it will produce the double track (having
1927 // the same seed segment hits as hits of a good track found before)
1928 AliMUONTrackK *track1, *track2;
1929 AliMUONHitForRec *hit1, *hit2, *hit;
1931 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1932 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1933 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1935 for (Int_t i=0; i<icand; i++) {
1936 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1937 //if (track2->GetRecover() < 0) continue;
1938 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1940 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1944 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1945 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1946 if (hit == hit1 || hit == hit2) {
1948 if (nSame == 2) return kFALSE;
1950 } // for (Int_t j=0;
1952 } // for (Int_t i=0;
1956 //__________________________________________________________________________
1957 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1959 // Removes double tracks (sharing more than half of their hits). Keeps
1960 // the track with higher quality
1961 AliMUONTrackK *track1, *track2, *trackToKill;
1963 // Sort tracks according to their quality
1964 fRecTracksPtr->Sort();
1966 // Loop over first track of the pair
1967 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1968 Int_t debug = track1->DebugLevel();
1970 // Loop over second track of the pair
1971 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1973 // Check whether or not to keep track2
1974 if (!track2->KeepTrack(track1)) {
1975 if (debug >= 0) cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1976 " " << track2->GetTrackQuality() << endl;
1977 trackToKill = track2;
1978 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1979 trackToKill->Kill();
1980 fRecTracksPtr->Compress();
1981 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1983 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1986 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1987 if (debug >= 0) cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1990 //__________________________________________________________________________
1991 void AliMUONEventReconstructor::GoToVertex(void)
1993 // Propagates track to the vertex thru absorber
1994 // (using Branson correction for now)
1998 for (Int_t i=0; i<fNRecTracks; i++) {
1999 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
2000 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
2001 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
2002 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(1); // with absorber
2006 //__________________________________________________________________________
2007 void AliMUONEventReconstructor::SetTrackMethod(Int_t iTrackMethod)
2009 // Set track method and recreate track container if necessary
2011 fTrackMethod = iTrackMethod == 2 ? 2 : 1;
2012 if (fTrackMethod == 2) {
2013 if (fRecTracksPtr) delete fRecTracksPtr;
2014 fRecTracksPtr = new TClonesArray("AliMUONTrackK", 10);
2015 cout << " *** Tracking with the Kalman filter *** " << endl;
2016 } else cout << " *** Traditional tracking *** " << endl;