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 Revision 1.13 2000/10/02 21:28:09 fca
19 Removal of useless dependecies via forward declarations
21 Revision 1.12 2000/10/02 16:58:29 egangler
22 Cleaning of the code :
25 -> some useless includes removed or replaced by "class" statement
27 Revision 1.11 2000/09/22 09:16:33 hristov
30 Revision 1.10 2000/09/19 09:49:50 gosset
31 AliMUONEventReconstructor package
32 * track extrapolation independent from reco_muon.F, use of AliMagF...
33 * possibility to use new magnetic field (automatic from generated root file)
35 Revision 1.9 2000/07/20 12:45:27 gosset
36 New "EventReconstructor..." structure,
37 hopefully more adapted to tree/streamer.
38 "AliMUONEventReconstructor::RemoveDoubleTracks"
39 to keep only one track among similar ones.
41 Revision 1.8 2000/07/18 16:04:06 gosset
42 AliMUONEventReconstructor package:
43 * a few minor modifications and more comments
45 * right sign for Z of raw clusters
46 * right loop over chambers inside station
47 * symmetrized covariance matrix for measurements (TrackChi2MCS)
48 * right sign of charge in extrapolation (ExtrapToZ)
49 * right zEndAbsorber for Branson correction below 3 degrees
50 * use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
51 * no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
53 Revision 1.7 2000/07/03 12:28:06 gosset
54 Printout at the right place after extrapolation to vertex
56 Revision 1.6 2000/06/30 12:01:06 gosset
57 Correction for hit search in the right chamber (JPC)
59 Revision 1.5 2000/06/30 10:15:48 gosset
60 Changes to EventReconstructor...:
61 precision fit with multiple Coulomb scattering;
62 extrapolation to vertex with Branson correction in absorber (JPC)
64 Revision 1.4 2000/06/27 14:11:36 gosset
65 Corrections against violations of coding conventions
67 Revision 1.3 2000/06/16 07:27:08 gosset
68 To remove problem in running RuleChecker, like in MUON-dev
70 Revision 1.1.2.5 2000/06/16 07:00:26 gosset
71 To remove problem in running RuleChecker
73 Revision 1.1.2.4 2000/06/12 08:00:07 morsch
74 Dummy streamer to solve CINT compilation problem (to be investigated !)
76 Revision 1.1.2.3 2000/06/09 20:59:57 morsch
77 Make includes consistent with new file structure.
79 Revision 1.1.2.2 2000/06/09 12:58:05 gosset
80 Removed comment beginnings in Log sections of .cxx files
81 Suppressed most violations of coding rules
83 Revision 1.1.2.1 2000/06/07 14:44:53 gosset
84 Addition of files for track reconstruction in C++
87 //__________________________________________________________________________
89 // MUON event reconstructor in ALICE
91 // This class contains as data:
92 // * the parameters for the event reconstruction
93 // * a pointer to the array of hits to be reconstructed (the event)
94 // * a pointer to the array of segments made with these hits inside each station
95 // * a pointer to the array of reconstructed tracks
97 // It contains as methods, among others:
98 // * MakeEventToBeReconstructed to build the array of hits to be reconstructed
99 // * MakeSegments to build the segments
100 // * MakeTracks to build the tracks
101 //__________________________________________________________________________
103 #include <iostream.h>
110 #include "AliMUONEventReconstructor.h"
112 #include "AliMUONHitForRec.h"
113 #include "AliMUONSegment.h"
114 #include "AliMUONHit.h"
115 #include "AliMUONRawCluster.h"
116 #include "AliMUONTrack.h"
117 #include "AliMUONChamber.h"
118 #include "AliMUONTrackHit.h"
121 #include "TParticle.h"
123 //************* Defaults parameters for reconstruction
124 static const Double_t kDefaultMinBendingMomentum = 3.0;
125 static const Double_t kDefaultMaxSigma2Distance = 16.0;
126 static const Double_t kDefaultBendingResolution = 0.01;
127 static const Double_t kDefaultNonBendingResolution = 0.144;
128 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
129 // Simple magnetic field:
130 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
131 // Length and Position from reco_muon.F, with opposite sign:
132 // Length = ZMAGEND-ZCOIL
133 // Position = (ZMAGEND+ZCOIL)/2
134 // to be ajusted differently from real magnetic field ????
135 static const Double_t kDefaultSimpleBValue = 7.0;
136 static const Double_t kDefaultSimpleBLength = 428.0;
137 static const Double_t kDefaultSimpleBPosition = 1019.0;
138 static const Int_t kDefaultRecGeantHits = 0;
139 static const Double_t kDefaultEfficiency = 0.95;
141 static const Int_t kDefaultPrintLevel = 0;
143 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
145 //__________________________________________________________________________
146 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
148 // Constructor for class AliMUONEventReconstructor
149 SetReconstructionParametersToDefaults();
150 // Memory allocation for the TClonesArray of hits for reconstruction
151 // Is 10000 the right size ????
152 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
153 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
154 // Memory allocation for the TClonesArray's of segments in stations
155 // Is 2000 the right size ????
156 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
157 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
158 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
160 // Memory allocation for the TClonesArray of reconstructed tracks
161 // Is 10 the right size ????
162 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
163 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
164 // Memory allocation for the TClonesArray of hits on reconstructed tracks
165 // Is 100 the right size ????
166 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
167 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
169 // Sign of fSimpleBValue according to sign of value at (50,50,950).
171 x[0] = 50.; x[1] = 50.; x[2] = 950.;
172 gAlice->Field()->Field(x, b);
173 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[2]);
174 // See how to get fSimple(BValue, BLength, BPosition)
175 // automatically calculated from the actual magnetic field ????
177 if (fPrintLevel >= 0) {
178 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
179 cout << endl << "Magnetic field from root file:" << endl;
180 gAlice->Field()->Dump();
186 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
188 // Dummy copy constructor
191 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
193 // Dummy assignment operator
197 //__________________________________________________________________________
198 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
200 // Destructor for class AliMUONEventReconstructor
201 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
202 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
203 delete fSegmentsPtr[st]; // Correct destruction of everything ????
207 //__________________________________________________________________________
208 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
210 // Set reconstruction parameters to default values
211 // Would be much more convenient with a structure (or class) ????
212 fMinBendingMomentum = kDefaultMinBendingMomentum;
213 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
215 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
216 // ******** Parameters for making HitsForRec
218 // like in TRACKF_STAT:
219 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
220 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
221 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
222 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
223 2.0 * TMath::Pi() / 180.0;
224 else fRMin[ch] = 30.0;
227 // like in TRACKF_STAT (10 degrees ????)
228 fRMax[0] = fRMax[1] = 91.5;
229 fRMax[2] = fRMax[3] = 122.5;
230 fRMax[4] = fRMax[5] = 158.3;
231 fRMax[6] = fRMax[7] = 260.0;
232 fRMax[8] = fRMax[9] = 260.0;
234 // ******** Parameters for making segments
235 // should be parametrized ????
236 // according to interval between chambers in a station ????
237 // Maximum distance in non bending plane
238 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
240 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
241 fSegmentMaxDistNonBending[st] = 5. * 0.22;
242 // Maximum distance in bending plane
243 // values from TRACKF_STAT corresponding to (J psi 20cm)
244 fSegmentMaxDistBending[0] = 1.5;
245 fSegmentMaxDistBending[1] = 1.5;
246 fSegmentMaxDistBending[2] = 3.0;
247 fSegmentMaxDistBending[3] = 6.0;
248 fSegmentMaxDistBending[4] = 6.0;
250 fBendingResolution = kDefaultBendingResolution;
251 fNonBendingResolution = kDefaultNonBendingResolution;
252 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
253 fSimpleBValue = kDefaultSimpleBValue;
254 fSimpleBLength = kDefaultSimpleBLength;
255 fSimpleBPosition = kDefaultSimpleBPosition;
256 fRecGeantHits = kDefaultRecGeantHits;
257 fEfficiency = kDefaultEfficiency;
258 fPrintLevel = kDefaultPrintLevel;
262 //__________________________________________________________________________
263 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum)
265 // Returns impact parameter at vertex in bending plane (cm),
266 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
267 // using simple values for dipole magnetic field.
268 // The sign is the sign of the charge.
269 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
273 //__________________________________________________________________________
274 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam)
276 // Returns signed bending momentum in bending plane (GeV/c),
277 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
278 // using simple values for dipole magnetic field.
279 // The sign is the sign of the charge.
280 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
284 //__________________________________________________________________________
285 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
287 // Set background file ... for GEANT hits
288 // Must be called after having loaded the firts signal event
289 if (fPrintLevel >= 0) {
290 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
291 << BkgGeantFileName << "''" << endl;}
292 if (strlen(BkgGeantFileName)) {
293 // BkgGeantFileName not empty: try to open the file
294 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
295 fBkgGeantFile = new TFile(BkgGeantFileName);
296 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
297 if (fBkgGeantFile-> IsOpen()) {
298 if (fPrintLevel >= 0) {
299 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
300 << "'' successfully opened" << endl;}
303 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
304 cout << "NOT FOUND: EXIT" << endl;
305 exit(0); // right instruction for exit ????
307 // Arrays for "particles" and "hits"
308 fBkgGeantParticles = new TClonesArray("TParticle", 200);
309 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
310 // Event number to -1 for initialization
311 fBkgGeantEventNumber = -1;
312 // Back to the signal file:
313 // first signal event must have been loaded previously,
314 // otherwise, Segmentation violation at the next instruction
315 // How is it possible to do smething better ????
316 ((gAlice->TreeK())->GetCurrentFile())->cd();
317 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
322 //__________________________________________________________________________
323 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
325 // Get next event in background file for GEANT hits
326 // Goes back to event number 0 when end of file is reached
329 if (fPrintLevel >= 0) {
330 cout << "Enter NextBkgGeantEvent" << endl;}
331 // Clean previous event
332 if(fBkgGeantTK) delete fBkgGeantTK;
334 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
335 if(fBkgGeantTH) delete fBkgGeantTH;
337 if(fBkgGeantHits) fBkgGeantHits->Clear();
338 // Increment event number
339 fBkgGeantEventNumber++;
340 // Get access to Particles and Hits for event from background file
341 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
343 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
344 // Particles: TreeK for event and branch "Particles"
345 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
346 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
348 if (fPrintLevel >= 0) {
349 cout << "Cannot find Kine Tree for background event: " <<
350 fBkgGeantEventNumber << endl;
351 cout << "Goes back to event 0" << endl;
353 fBkgGeantEventNumber = 0;
354 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
355 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
357 cout << "ERROR: cannot find Kine Tree for background event: " <<
358 fBkgGeantEventNumber << endl;
363 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
364 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
365 // Hits: TreeH for event and branch "MUON"
366 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
367 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
369 cout << "ERROR: cannot find Hits Tree for background event: " <<
370 fBkgGeantEventNumber << endl;
373 if (fBkgGeantTH && fBkgGeantHits) {
374 branch = fBkgGeantTH->GetBranch("MUON");
375 if (branch) branch->SetAddress(&fBkgGeantHits);
377 fBkgGeantTH->GetEntries(); // necessary ????
378 // Back to the signal file
379 ((gAlice->TreeK())->GetCurrentFile())->cd();
380 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
384 //__________________________________________________________________________
385 void AliMUONEventReconstructor::EventReconstruct(void)
387 // To reconstruct one event
388 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
389 MakeEventToBeReconstructed();
395 //__________________________________________________________________________
396 void AliMUONEventReconstructor::ResetHitsForRec(void)
398 // To reset the array and the number of HitsForRec,
399 // and also the number of HitsForRec
400 // and the index of the first HitForRec per chamber
401 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
403 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
404 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
408 //__________________________________________________________________________
409 void AliMUONEventReconstructor::ResetSegments(void)
411 // To reset the TClonesArray of segments and the number of Segments
413 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
414 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
420 //__________________________________________________________________________
421 void AliMUONEventReconstructor::ResetTracks(void)
423 // To reset the TClonesArray of reconstructed tracks
424 if (fRecTracksPtr) fRecTracksPtr->Delete();
425 // Delete in order that the Track destructors are called,
426 // hence the space for the TClonesArray of pointers to TrackHit's is freed
431 //__________________________________________________________________________
432 void AliMUONEventReconstructor::ResetTrackHits(void)
434 // To reset the TClonesArray of hits on reconstructed tracks
435 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
440 //__________________________________________________________________________
441 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
443 // To make the list of hits to be reconstructed,
444 // either from the GEANT hits or from the raw clusters
445 // according to the parameter set for the reconstructor
446 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
448 if (fRecGeantHits == 1) {
449 // Reconstruction from GEANT hits
450 // Back to the signal file
451 ((gAlice->TreeK())->GetCurrentFile())->cd();
453 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
454 // Security on MUON ????
455 AddHitsForRecFromGEANT(gAlice->TreeH());
457 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
458 // Sort HitsForRec in increasing order with respect to chamber number
459 SortHitsForRecWithIncreasingChamber();
462 // Reconstruction from raw clusters
463 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
464 // Security on MUON ????
465 // TreeR assumed to be be "prepared" in calling function
466 // by "MUON->GetTreeR(nev)" ????
467 TTree *treeR = gAlice->TreeR();
468 AddHitsForRecFromRawClusters(treeR);
469 // No sorting: it is done automatically in the previous function
471 if (fPrintLevel >= 10) {
472 cout << "end of MakeEventToBeReconstructed" << endl;
473 cout << "NHitsForRec: " << fNHitsForRec << endl;
474 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
475 cout << "chamber(0...): " << ch
476 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
477 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
479 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
480 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
482 cout << "HitForRec index(0...): " << hit << endl;
483 ((*fHitsForRecPtr)[hit])->Dump();
490 //__________________________________________________________________________
491 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
493 // To add to the list of hits for reconstruction
494 // the GEANT signal hits from a hit tree TH.
495 if (fPrintLevel >= 2)
496 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
497 if (TH == NULL) return;
498 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
499 // Security on MUON ????
500 // See whether it could be the same for signal and background ????
501 // Loop over tracks in tree
502 Int_t ntracks = (Int_t) TH->GetEntries();
503 if (fPrintLevel >= 2)
504 cout << "ntracks: " << ntracks << endl;
505 for (Int_t track = 0; track < ntracks; track++) {
510 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
512 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
513 NewHitForRecFromGEANT(mHit,track, hit, 1);
515 } // end of track loop
519 //__________________________________________________________________________
520 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
522 // To add to the list of hits for reconstruction
523 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
524 // How to have only one function "AddHitsForRecFromGEANT" ????
525 if (fPrintLevel >= 2)
526 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
527 if (TH == NULL) return;
528 // Loop over tracks in tree
529 Int_t ntracks = (Int_t) TH->GetEntries();
530 if (fPrintLevel >= 2)
531 cout << "ntracks: " << ntracks << endl;
532 for (Int_t track = 0; track < ntracks; track++) {
533 if (Hits) Hits->Clear();
536 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
537 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
539 } // end of track loop
543 //__________________________________________________________________________
544 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
546 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
547 // with hit number "HitNumber" in the track numbered "TrackNumber",
548 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
549 // Selects hits in tracking (not trigger) chambers.
550 // Takes into account the efficiency (fEfficiency)
551 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
552 // Adds a condition on the radius between RMin and RMax
553 // to better simulate the real chambers.
554 // Returns the pointer to the new hit for reconstruction,
555 // or NULL in case of inefficiency or non tracking chamber or bad radius.
556 // No condition on at most 20 cm from a muon from a resonance
557 // like in Fortran TRACKF_STAT.
558 AliMUONHitForRec* hitForRec;
559 Double_t bendCoor, nonBendCoor, radius;
560 Int_t chamber = Hit->fChamber - 1; // chamber(0...)
561 // only in tracking chambers (fChamber starts at 1)
562 if (chamber >= kMaxMuonTrackingChambers) return NULL;
563 // only if hit is efficient (keep track for checking ????)
564 if (gRandom->Rndm() > fEfficiency) return NULL;
565 // only if radius between RMin and RMax
567 nonBendCoor = Hit->X();
568 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
569 if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
570 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
571 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
573 // add smearing from resolution
574 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
575 hitForRec->SetNonBendingCoor(nonBendCoor
576 + gRandom->Gaus(0., fNonBendingResolution));
577 // more information into HitForRec
578 // resolution: angular effect to be added here ????
579 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
580 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
582 hitForRec->SetHitNumber(HitNumber);
583 hitForRec->SetTHTrack(TrackNumber);
584 hitForRec->SetGeantSignal(Signal);
585 if (fPrintLevel >= 10) {
586 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
588 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
593 //__________________________________________________________________________
594 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
596 // Sort HitsForRec's in increasing order with respect to chamber number.
597 // Uses the function "Compare".
598 // Update the information for HitsForRec per chamber too.
599 Int_t ch, nhits, prevch;
600 fHitsForRecPtr->Sort();
601 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
602 fNHitsForRecPerChamber[ch] = 0;
603 fIndexOfFirstHitForRecPerChamber[ch] = 0;
605 prevch = 0; // previous chamber
606 nhits = 0; // number of hits in current chamber
607 // Loop over HitsForRec
608 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
609 // chamber number (0...)
610 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
611 // increment number of hits in current chamber
612 (fNHitsForRecPerChamber[ch])++;
613 // update index of first HitForRec in current chamber
614 // if chamber number different from previous one
616 fIndexOfFirstHitForRecPerChamber[ch] = hit;
623 // //__________________________________________________________________________
624 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
626 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
627 // // To add to the list of hits for reconstruction
628 // // the (cathode correlated) raw clusters
629 // // No condition added, like in Fortran TRACKF_STAT,
630 // // on the radius between RMin and RMax.
631 // AliMUONHitForRec *hitForRec;
632 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
633 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
634 // // Security on MUON ????
635 // // Loop over tracking chambers
636 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
637 // // number of HitsForRec to 0 for the chamber
638 // fNHitsForRecPerChamber[ch] = 0;
639 // // index of first HitForRec for the chamber
640 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
641 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
642 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
643 // MUON->ResetReconstHits();
645 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
646 // // Loop over (cathode correlated) raw clusters
647 // for (Int_t cor = 0; cor < ncor; cor++) {
648 // AliMUONReconstHit * mCor =
649 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
650 // // new AliMUONHitForRec from (cathode correlated) raw cluster
651 // // and increment number of AliMUONHitForRec's (total and in chamber)
652 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
654 // (fNHitsForRecPerChamber[ch])++;
655 // // more information into HitForRec
656 // hitForRec->SetChamberNumber(ch);
657 // hitForRec->SetHitNumber(cor);
658 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
659 // // could (should) be more exact from chamber geometry ????
660 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
661 // if (fPrintLevel >= 10) {
662 // cout << "chamber (0...): " << ch <<
663 // " cathcorrel (0...): " << cor << endl;
665 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
666 // hitForRec->Dump();}
667 // } // end of cluster loop
668 // } // end of chamber loop
672 //__________________________________________________________________________
673 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
675 // To add to the list of hits for reconstruction all the raw clusters
676 // No condition added, like in Fortran TRACKF_STAT,
677 // on the radius between RMin and RMax.
678 AliMUONHitForRec *hitForRec;
679 AliMUONRawCluster *clus;
681 TClonesArray *rawclusters;
682 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
683 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
684 // Security on MUON ????
685 // Loop over tracking chambers
686 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
687 // number of HitsForRec to 0 for the chamber
688 fNHitsForRecPerChamber[ch] = 0;
689 // index of first HitForRec for the chamber
690 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
691 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
692 rawclusters = pMUON->RawClustAddress(ch);
693 pMUON->ResetRawClusters();
694 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
695 nclus = (Int_t) (rawclusters->GetEntries());
696 // Loop over (cathode correlated) raw clusters
697 for (iclus = 0; iclus < nclus; iclus++) {
698 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
699 // new AliMUONHitForRec from raw cluster
700 // and increment number of AliMUONHitForRec's (total and in chamber)
701 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
703 (fNHitsForRecPerChamber[ch])++;
704 // more information into HitForRec
705 // resolution: info should be already in raw cluster and taken from it ????
706 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
707 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
708 // original raw cluster
709 hitForRec->SetChamberNumber(ch);
710 hitForRec->SetHitNumber(iclus);
711 // Z coordinate of the chamber (cm)
712 // could (should) be more exact from chamber geometry ????
713 hitForRec->SetZ((&(pMUON->Chamber(ch)))->Z());
714 if (fPrintLevel >= 10) {
715 cout << "chamber (0...): " << ch <<
716 " raw cluster (0...): " << iclus << endl;
718 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
720 } // end of cluster loop
721 } // end of chamber loop
725 //__________________________________________________________________________
726 void AliMUONEventReconstructor::MakeSegments(void)
728 // To make the list of segments in all stations,
729 // from the list of hits to be reconstructed
730 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
732 // Loop over stations
733 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
734 MakeSegmentsPerStation(st);
735 if (fPrintLevel >= 10) {
736 cout << "end of MakeSegments" << endl;
737 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
738 cout << "station(0...): " << st
739 << " Segments: " << fNSegments[st]
742 seg < fNSegments[st];
744 cout << "Segment index(0...): " << seg << endl;
745 ((*fSegmentsPtr[st])[seg])->Dump();
752 //__________________________________________________________________________
753 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
755 // To make the list of segments in station number "Station" (0...)
756 // from the list of hits to be reconstructed.
757 // Updates "fNSegments"[Station].
758 // Segments in stations 4 and 5 are sorted
759 // according to increasing absolute value of "impact parameter"
760 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
761 AliMUONSegment *segment;
763 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
764 impactParam = 0., maxImpactParam = 0.; // =0 to avoid compilation warnings.
765 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
766 if (fPrintLevel >= 1)
767 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
768 // first and second chambers (0...) in the station
769 Int_t ch1 = 2 * Station;
771 // variable true for stations downstream of the dipole:
772 // Station(0..4) equal to 3 or 4
773 if ((Station == 3) || (Station == 4)) {
775 // maximum impact parameter (cm) according to fMinBendingMomentum...
777 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
779 else last2st = kFALSE;
780 // extrapolation factor from Z of first chamber to Z of second chamber
781 // dZ to be changed to take into account fine structure of chambers ????
782 Double_t extrapFact =
783 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
784 // index for current segment
785 Int_t segmentIndex = 0;
786 // Loop over HitsForRec in the first chamber of the station
787 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
788 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
790 // pointer to the HitForRec
791 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
793 // on the straight line joining the HitForRec to the vertex (0,0,0),
794 // to the Z of the second chamber of the station
795 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
796 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
797 // Loop over HitsForRec in the second chamber of the station
798 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
799 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
801 // pointer to the HitForRec
802 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
803 // absolute values of distances, in bending and non bending planes,
804 // between the HitForRec in the second chamber
805 // and the previous extrapolation
806 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
807 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
810 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
811 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
812 // absolute value of impact parameter
814 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
816 // check for distances not too large,
817 // and impact parameter not too big if stations downstream of the dipole.
818 // Conditions "distBend" and "impactParam" correlated for these stations ????
819 if ((distBend < fSegmentMaxDistBending[Station]) &&
820 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
821 (!last2st || (impactParam < maxImpactParam))) {
823 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
824 AliMUONSegment(hit1Ptr, hit2Ptr);
825 // update "link" to this segment from the hit in the first chamber
826 if (hit1Ptr->GetNSegments() == 0)
827 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
828 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
829 if (fPrintLevel >= 10) {
830 cout << "segmentIndex(0...): " << segmentIndex
831 << " distBend: " << distBend
832 << " distNonBend: " << distNonBend
835 cout << "HitForRec in first chamber" << endl;
837 cout << "HitForRec in second chamber" << endl;
840 // increment index for current segment
844 } // for (Int_t hit1...
845 fNSegments[Station] = segmentIndex;
846 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
847 // i.e. Station(0..4) 3 or 4, using the function "Compare".
848 // After this sorting, it is impossible to use
849 // the "fNSegments" and "fIndexOfFirstSegment"
850 // of the HitForRec in the first chamber to explore all segments formed with it.
851 // Is this sorting really needed ????
852 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
853 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
854 << fNSegments[Station] << endl;
858 //__________________________________________________________________________
859 void AliMUONEventReconstructor::MakeTracks(void)
861 // To make the tracks,
862 // from the list of segments and points in all stations
863 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
864 // The order may be important for the following Reset's
867 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
868 MakeTrackCandidates();
869 // Follow tracks in stations(1..) 3, 2 and 1
871 // Remove double tracks
872 RemoveDoubleTracks();
876 //__________________________________________________________________________
877 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
879 // To make track candidates with two segments in stations(1..) 4 and 5,
880 // the first segment being pointed to by "BegSegment".
881 // Returns the number of such track candidates.
882 Int_t endStation, iEndSegment, nbCan2Seg;
883 AliMUONSegment *endSegment, *extrapSegment;
884 AliMUONTrack *recTrack;
886 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
887 // Station for the end segment
888 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
889 // multiple scattering factor corresponding to one chamber
891 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
892 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
893 // linear extrapolation to end station
895 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
896 // number of candidates with 2 segments to 0
898 // Loop over segments in the end station
899 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
900 // pointer to segment
901 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
902 // test compatibility between current segment and "extrapSegment"
903 // 4 because 4 quantities in chi2
905 NormalizedChi2WithSegment(extrapSegment,
906 fMaxSigma2Distance)) <= 4.0) {
907 // both segments compatible:
908 // make track candidate from "begSegment" and "endSegment"
909 if (fPrintLevel >= 2)
910 cout << "TrackCandidate with Segment " << iEndSegment <<
911 " in Station(0..) " << endStation << endl;
912 // flag for both segments in one track:
913 // to be done in track constructor ????
914 BegSegment->SetInTrack(kTRUE);
915 endSegment->SetInTrack(kTRUE);
916 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
917 AliMUONTrack(BegSegment, endSegment, this);
919 if (fPrintLevel >= 10) recTrack->RecursiveDump();
920 // increment number of track candidates with 2 segments
923 } // for (iEndSegment = 0;...
924 delete extrapSegment; // should not delete HitForRec's it points to !!!!
928 //__________________________________________________________________________
929 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
931 // To make track candidates with one segment and one point
932 // in stations(1..) 4 and 5,
933 // the segment being pointed to by "BegSegment".
934 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
935 AliMUONHitForRec *extrapHitForRec, *hit;
936 AliMUONTrack *recTrack;
938 if (fPrintLevel >= 1)
939 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
940 // station for the end point
941 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
942 // multiple scattering factor corresponding to one chamber
944 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
945 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
946 // first and second chambers(0..) in the end station
947 ch1 = 2 * endStation;
949 // number of candidates to 0
951 // Loop over chambers of the end station
952 for (ch = ch2; ch >= ch1; ch--) {
953 // linear extrapolation to chamber
955 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
956 // limits for the hit index in the loop
957 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
958 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
959 // Loop over HitForRec's in the chamber
960 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
961 // pointer to HitForRec
962 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
963 // test compatibility between current HitForRec and "extrapHitForRec"
964 // 2 because 2 quantities in chi2
966 NormalizedChi2WithHitForRec(extrapHitForRec,
967 fMaxSigma2Distance)) <= 2.0) {
968 // both HitForRec's compatible:
969 // make track candidate from begSegment and current HitForRec
970 if (fPrintLevel >= 2)
971 cout << "TrackCandidate with HitForRec " << iHit <<
972 " in Chamber(0..) " << ch << endl;
973 // flag for beginning segments in one track:
974 // to be done in track constructor ????
975 BegSegment->SetInTrack(kTRUE);
976 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
977 AliMUONTrack(BegSegment, hit, this);
978 // the right place to eliminate "double counting" ???? how ????
980 if (fPrintLevel >= 10) recTrack->RecursiveDump();
981 // increment number of track candidates
984 } // for (iHit = iHitMin;...
985 delete extrapHitForRec;
986 } // for (ch = ch2;...
987 return nbCan1Seg1Hit;
990 //__________________________________________________________________________
991 void AliMUONEventReconstructor::MakeTrackCandidates(void)
993 // To make track candidates
994 // with at least 3 aligned points in stations(1..) 4 and 5
995 // (two Segment's or one Segment and one HitForRec)
996 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
997 AliMUONSegment *begSegment;
998 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
999 // Loop over stations(1..) 5 and 4 for the beginning segment
1000 for (begStation = 4; begStation > 2; begStation--) {
1001 // Loop over segments in the beginning station
1002 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1003 // pointer to segment
1004 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1005 if (fPrintLevel >= 2)
1006 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1007 " in Station(0..) " << begStation << endl;
1008 // Look for track candidates with two segments,
1009 // "begSegment" and all compatible segments in other station.
1010 // Only for beginning station(1..) 5
1011 // because candidates with 2 segments have to looked for only once.
1012 if (begStation == 4)
1013 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1014 // Look for track candidates with one segment and one point,
1015 // "begSegment" and all compatible HitForRec's in other station.
1016 // Only if "begSegment" does not belong already to a track candidate.
1017 // Is that a too strong condition ????
1018 if (!(begSegment->GetInTrack()))
1019 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1020 } // for (iBegSegment = 0;...
1021 } // for (begStation = 4;...
1025 //__________________________________________________________________________
1026 void AliMUONEventReconstructor::FollowTracks(void)
1028 // Follow tracks in stations(1..) 3, 2 and 1
1029 // too long: should be made more modular !!!!
1030 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1031 AliMUONSegment *bestSegment, *extrapSegment, *segment;
1032 AliMUONTrack *track, *nextTrack;
1033 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1034 // -1 to avoid compilation warnings
1035 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1036 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1037 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1038 // local maxSigma2Distance, for easy increase in testing
1039 maxSigma2Distance = fMaxSigma2Distance;
1040 if (fPrintLevel >= 2)
1041 cout << "enter FollowTracks" << endl;
1042 // Loop over track candidates
1043 track = (AliMUONTrack*) fRecTracksPtr->First();
1046 // Follow function for each track candidate ????
1048 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1049 if (fPrintLevel >= 2)
1050 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1051 // Fit track candidate
1052 track->SetFitMCS(0); // without multiple Coulomb scattering
1053 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1054 track->SetFitStart(0); // from parameters at vertex
1056 if (fPrintLevel >= 10) {
1057 cout << "FollowTracks: track candidate(0..): " << trackIndex
1058 << " after fit in stations(0..) 3 and 4" << endl;
1059 track->RecursiveDump();
1061 // Loop over stations(1..) 3, 2 and 1
1062 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1063 // otherwise: majority coincidence 2 !!!!
1064 for (station = 2; station >= 0; station--) {
1065 // Track parameters at first track hit (smallest Z)
1066 trackParam1 = ((AliMUONTrackHit*)
1067 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1068 // extrapolation to station
1069 trackParam1->ExtrapToStation(station, trackParam);
1070 extrapSegment = new AliMUONSegment(); // empty segment
1071 // multiple scattering factor corresponding to one chamber
1072 // and momentum in bending plane (not total)
1073 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1074 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1075 // Z difference from previous station
1076 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1077 (&(pMUON->Chamber(2 * station + 2)))->Z();
1078 // Z difference between the two previous stations
1079 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1080 (&(pMUON->Chamber(2 * station + 4)))->Z();
1081 // Z difference between the two chambers in the previous station
1082 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1083 (&(pMUON->Chamber(2 * station + 1)))->Z();
1084 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1086 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1087 extrapSegment->UpdateFromStationTrackParam
1088 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1089 trackParam1->GetInverseBendingMomentum());
1092 if (fPrintLevel >= 10) {
1093 cout << "FollowTracks: track candidate(0..): " << trackIndex
1094 << " Look for segment in station(0..): " << station << endl;
1096 // Loop over segments in station
1097 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1098 // Look for best compatible Segment in station
1099 // should consider all possibilities ????
1100 // multiple scattering ????
1101 // separation in 2 functions: Segment and HitForRec ????
1102 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1103 chi2 = segment->NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1104 if (chi2 < bestChi2) {
1105 // update best Chi2 and Segment if better found
1106 bestSegment = segment;
1111 // best segment found: add it to track candidate
1112 track->AddSegment(bestSegment);
1113 // set track parameters at these two TrakHit's
1114 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1115 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1116 if (fPrintLevel >= 10) {
1117 cout << "FollowTracks: track candidate(0..): " << trackIndex
1118 << " Added segment in station(0..): " << station << endl;
1119 track->RecursiveDump();
1123 // No best segment found:
1124 // Look for best compatible HitForRec in station:
1125 // should consider all possibilities ????
1126 // multiple scattering ???? do about like for extrapSegment !!!!
1127 extrapHit = new AliMUONHitForRec(); // empty hit
1130 if (fPrintLevel >= 10) {
1131 cout << "FollowTracks: track candidate(0..): " << trackIndex
1132 << " Segment not found, look for hit in station(0..): " << station
1135 // Loop over chambers of the station
1136 for (chInStation = 0; chInStation < 2; chInStation++) {
1137 // coordinates of extrapolated hit
1139 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1141 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1142 // resolutions from "extrapSegment"
1143 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1144 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1145 // Loop over hits in the chamber
1146 ch = 2 * station + chInStation;
1147 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1148 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1149 fNHitsForRecPerChamber[ch];
1151 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1152 // condition for hit not already in segment ????
1153 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1154 if (chi2 < bestChi2) {
1155 // update best Chi2 and HitForRec if better found
1158 chBestHit = chInStation;
1163 // best hit found: add it to track candidate
1164 track->AddHitForRec(bestHit);
1165 // set track parameters at this TrackHit
1166 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1167 &(trackParam[chBestHit]));
1168 if (fPrintLevel >= 10) {
1169 cout << "FollowTracks: track candidate(0..): " << trackIndex
1170 << " Added hit in station(0..): " << station << endl;
1171 track->RecursiveDump();
1175 // Remove current track candidate
1176 // and corresponding TrackHit's, ...
1178 delete extrapSegment;
1179 break; // stop the search for this candidate:
1180 // exit from the loop over station
1183 delete extrapSegment;
1184 // Sort track hits according to increasing Z
1185 track->GetTrackHitsPtr()->Sort();
1186 // Update track parameters at first track hit (smallest Z)
1187 trackParam1 = ((AliMUONTrackHit*)
1188 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1190 // with multiple Coulomb scattering if all stations
1191 if (station == 0) track->SetFitMCS(1);
1192 // without multiple Coulomb scattering if not all stations
1193 else track->SetFitMCS(0);
1194 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1195 track->SetFitStart(1); // from parameters at first hit
1197 if (fPrintLevel >= 10) {
1198 cout << "FollowTracks: track candidate(0..): " << trackIndex
1199 << " after fit from station(0..): " << station << " to 4" << endl;
1200 track->RecursiveDump();
1202 // Track extrapolation to the vertex through the absorber (Branson)
1203 // after going through the first station
1205 trackParamVertex = *trackParam1;
1206 (&trackParamVertex)->ExtrapToVertex();
1207 track->SetTrackParamAtVertex(&trackParamVertex);
1208 if (fPrintLevel >= 1) {
1209 cout << "FollowTracks: track candidate(0..): " << trackIndex
1210 << " after extrapolation to vertex" << endl;
1211 track->RecursiveDump();
1214 } // for (station = 2;...
1215 // go really to next track
1218 // Compression of track array (necessary after Remove ????)
1219 fRecTracksPtr->Compress();
1223 //__________________________________________________________________________
1224 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1226 // To remove double tracks.
1227 // Tracks are considered identical
1228 // if they have at least half of their hits in common.
1229 // Among two identical tracks, one keeps the track with the larger number of hits
1230 // or, if these numbers are equal, the track with the minimum Chi2.
1231 AliMUONTrack *track1, *track2, *trackToRemove;
1232 Bool_t identicalTracks;
1233 Int_t hitsInCommon, nHits1, nHits2;
1234 identicalTracks = kTRUE;
1235 while (identicalTracks) {
1236 identicalTracks = kFALSE;
1237 // Loop over first track of the pair
1238 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1239 while (track1 && (!identicalTracks)) {
1240 nHits1 = track1->GetNTrackHits();
1241 // Loop over second track of the pair
1242 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1243 while (track2 && (!identicalTracks)) {
1244 nHits2 = track2->GetNTrackHits();
1245 // number of hits in common between two tracks
1246 hitsInCommon = track1->HitsInCommon(track2);
1247 // check for identical tracks
1248 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1249 identicalTracks = kTRUE;
1250 // decide which track to remove
1251 if (nHits1 > nHits2) trackToRemove = track2;
1252 else if (nHits1 < nHits2) trackToRemove = track1;
1253 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1254 trackToRemove = track2;
1255 else trackToRemove = track1;
1257 trackToRemove->Remove();
1259 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1261 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1267 //__________________________________________________________________________
1268 void AliMUONEventReconstructor::EventDump(void)
1270 // Dump reconstructed event (track parameters at vertex and at first hit),
1271 // and the particle parameters
1273 AliMUONTrack *track;
1274 AliMUONTrackParam *trackParam, *trackParam1;
1275 TClonesArray *particles; // pointer to the particle list
1277 Double_t bendingSlope, nonBendingSlope, pYZ;
1278 Double_t pX, pY, pZ, x, y, z, c;
1279 Int_t np, trackIndex, nTrackHits;
1281 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1282 if (fPrintLevel >= 1) {
1283 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1285 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1286 // Loop over reconstructed tracks
1287 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1288 if (fPrintLevel >= 1)
1289 cout << " track number: " << trackIndex << endl;
1290 // function for each track for modularity ????
1291 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1292 nTrackHits = track->GetNTrackHits();
1293 if (fPrintLevel >= 1)
1294 cout << " number of track hits: " << nTrackHits << endl;
1295 // track parameters at Vertex
1296 trackParam = track->GetTrackParamAtVertex();
1297 x = trackParam->GetNonBendingCoor();
1298 y = trackParam->GetBendingCoor();
1299 z = trackParam->GetZ();
1300 bendingSlope = trackParam->GetBendingSlope();
1301 nonBendingSlope = trackParam->GetNonBendingSlope();
1302 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1303 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1304 pX = pZ * nonBendingSlope;
1305 pY = pZ * bendingSlope;
1306 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1307 if (fPrintLevel >= 1)
1308 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1309 z, x, y, pX, pY, pZ, c);
1311 // track parameters at first hit
1312 trackParam1 = ((AliMUONTrackHit*)
1313 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1314 x = trackParam1->GetNonBendingCoor();
1315 y = trackParam1->GetBendingCoor();
1316 z = trackParam1->GetZ();
1317 bendingSlope = trackParam1->GetBendingSlope();
1318 nonBendingSlope = trackParam1->GetNonBendingSlope();
1319 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1320 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1321 pX = pZ * nonBendingSlope;
1322 pY = pZ * bendingSlope;
1323 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1324 if (fPrintLevel >= 1)
1325 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1326 z, x, y, pX, pY, pZ, c);
1328 // informations about generated particles
1329 particles = gAlice->Particles();
1330 np = particles->GetEntriesFast();
1331 printf(" **** number of generated particles: %d \n", np);
1333 for (Int_t iPart = 0; iPart < np; iPart++) {
1334 p = (TParticle*) particles->UncheckedAt(iPart);
1335 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1336 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());