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 1.14 2000/10/04 18:21:26 morsch
21 Revision 1.13 2000/10/02 21:28:09 fca
22 Removal of useless dependecies via forward declarations
24 Revision 1.12 2000/10/02 16:58:29 egangler
25 Cleaning of the code :
28 -> some useless includes removed or replaced by "class" statement
30 Revision 1.11 2000/09/22 09:16:33 hristov
33 Revision 1.10 2000/09/19 09:49:50 gosset
34 AliMUONEventReconstructor package
35 * track extrapolation independent from reco_muon.F, use of AliMagF...
36 * possibility to use new magnetic field (automatic from generated root file)
38 Revision 1.9 2000/07/20 12:45:27 gosset
39 New "EventReconstructor..." structure,
40 hopefully more adapted to tree/streamer.
41 "AliMUONEventReconstructor::RemoveDoubleTracks"
42 to keep only one track among similar ones.
44 Revision 1.8 2000/07/18 16:04:06 gosset
45 AliMUONEventReconstructor package:
46 * a few minor modifications and more comments
48 * right sign for Z of raw clusters
49 * right loop over chambers inside station
50 * symmetrized covariance matrix for measurements (TrackChi2MCS)
51 * right sign of charge in extrapolation (ExtrapToZ)
52 * right zEndAbsorber for Branson correction below 3 degrees
53 * use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
54 * no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
56 Revision 1.7 2000/07/03 12:28:06 gosset
57 Printout at the right place after extrapolation to vertex
59 Revision 1.6 2000/06/30 12:01:06 gosset
60 Correction for hit search in the right chamber (JPC)
62 Revision 1.5 2000/06/30 10:15:48 gosset
63 Changes to EventReconstructor...:
64 precision fit with multiple Coulomb scattering;
65 extrapolation to vertex with Branson correction in absorber (JPC)
67 Revision 1.4 2000/06/27 14:11:36 gosset
68 Corrections against violations of coding conventions
70 Revision 1.3 2000/06/16 07:27:08 gosset
71 To remove problem in running RuleChecker, like in MUON-dev
73 Revision 1.1.2.5 2000/06/16 07:00:26 gosset
74 To remove problem in running RuleChecker
76 Revision 1.1.2.4 2000/06/12 08:00:07 morsch
77 Dummy streamer to solve CINT compilation problem (to be investigated !)
79 Revision 1.1.2.3 2000/06/09 20:59:57 morsch
80 Make includes consistent with new file structure.
82 Revision 1.1.2.2 2000/06/09 12:58:05 gosset
83 Removed comment beginnings in Log sections of .cxx files
84 Suppressed most violations of coding rules
86 Revision 1.1.2.1 2000/06/07 14:44:53 gosset
87 Addition of files for track reconstruction in C++
90 //__________________________________________________________________________
92 // MUON event reconstructor in ALICE
94 // This class contains as data:
95 // * the parameters for the event reconstruction
96 // * a pointer to the array of hits to be reconstructed (the event)
97 // * a pointer to the array of segments made with these hits inside each station
98 // * a pointer to the array of reconstructed tracks
100 // It contains as methods, among others:
101 // * MakeEventToBeReconstructed to build the array of hits to be reconstructed
102 // * MakeSegments to build the segments
103 // * MakeTracks to build the tracks
104 //__________________________________________________________________________
106 #include <iostream.h>
113 #include "AliMUONEventReconstructor.h"
115 #include "AliMUONHitForRec.h"
116 #include "AliMUONSegment.h"
117 #include "AliMUONHit.h"
118 #include "AliMUONRawCluster.h"
119 #include "AliMUONTrack.h"
120 #include "AliMUONChamber.h"
121 #include "AliMUONTrackHit.h"
124 #include "TParticle.h"
126 //************* Defaults parameters for reconstruction
127 static const Double_t kDefaultMinBendingMomentum = 3.0;
128 static const Double_t kDefaultMaxSigma2Distance = 16.0;
129 static const Double_t kDefaultBendingResolution = 0.01;
130 static const Double_t kDefaultNonBendingResolution = 0.144;
131 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
132 // Simple magnetic field:
133 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
134 // Length and Position from reco_muon.F, with opposite sign:
135 // Length = ZMAGEND-ZCOIL
136 // Position = (ZMAGEND+ZCOIL)/2
137 // to be ajusted differently from real magnetic field ????
138 static const Double_t kDefaultSimpleBValue = 7.0;
139 static const Double_t kDefaultSimpleBLength = 428.0;
140 static const Double_t kDefaultSimpleBPosition = 1019.0;
141 static const Int_t kDefaultRecGeantHits = 0;
142 static const Double_t kDefaultEfficiency = 0.95;
144 static const Int_t kDefaultPrintLevel = 0;
146 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
148 //__________________________________________________________________________
149 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
151 // Constructor for class AliMUONEventReconstructor
152 SetReconstructionParametersToDefaults();
153 // Memory allocation for the TClonesArray of hits for reconstruction
154 // Is 10000 the right size ????
155 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
156 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
157 // Memory allocation for the TClonesArray's of segments in stations
158 // Is 2000 the right size ????
159 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
160 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
161 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
163 // Memory allocation for the TClonesArray of reconstructed tracks
164 // Is 10 the right size ????
165 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
166 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
167 // Memory allocation for the TClonesArray of hits on reconstructed tracks
168 // Is 100 the right size ????
169 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
170 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
172 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
174 x[0] = 50.; x[1] = 50.; x[2] = 950.;
175 gAlice->Field()->Field(x, b);
176 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
177 // See how to get fSimple(BValue, BLength, BPosition)
178 // automatically calculated from the actual magnetic field ????
180 if (fPrintLevel >= 0) {
181 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
182 cout << endl << "Magnetic field from root file:" << endl;
183 gAlice->Field()->Dump();
189 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
191 // Dummy copy constructor
194 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
196 // Dummy assignment operator
200 //__________________________________________________________________________
201 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
203 // Destructor for class AliMUONEventReconstructor
204 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
205 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
206 delete fSegmentsPtr[st]; // Correct destruction of everything ????
210 //__________________________________________________________________________
211 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
213 // Set reconstruction parameters to default values
214 // Would be much more convenient with a structure (or class) ????
215 fMinBendingMomentum = kDefaultMinBendingMomentum;
216 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
218 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
219 // ******** Parameters for making HitsForRec
221 // like in TRACKF_STAT:
222 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
223 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
224 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
225 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
226 2.0 * TMath::Pi() / 180.0;
227 else fRMin[ch] = 30.0;
230 // like in TRACKF_STAT (10 degrees ????)
231 fRMax[0] = fRMax[1] = 91.5;
232 fRMax[2] = fRMax[3] = 122.5;
233 fRMax[4] = fRMax[5] = 158.3;
234 fRMax[6] = fRMax[7] = 260.0;
235 fRMax[8] = fRMax[9] = 260.0;
237 // ******** Parameters for making segments
238 // should be parametrized ????
239 // according to interval between chambers in a station ????
240 // Maximum distance in non bending plane
241 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
243 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
244 fSegmentMaxDistNonBending[st] = 5. * 0.22;
245 // Maximum distance in bending plane
246 // values from TRACKF_STAT corresponding to (J psi 20cm)
247 fSegmentMaxDistBending[0] = 1.5;
248 fSegmentMaxDistBending[1] = 1.5;
249 fSegmentMaxDistBending[2] = 3.0;
250 fSegmentMaxDistBending[3] = 6.0;
251 fSegmentMaxDistBending[4] = 6.0;
253 fBendingResolution = kDefaultBendingResolution;
254 fNonBendingResolution = kDefaultNonBendingResolution;
255 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
256 fSimpleBValue = kDefaultSimpleBValue;
257 fSimpleBLength = kDefaultSimpleBLength;
258 fSimpleBPosition = kDefaultSimpleBPosition;
259 fRecGeantHits = kDefaultRecGeantHits;
260 fEfficiency = kDefaultEfficiency;
261 fPrintLevel = kDefaultPrintLevel;
265 //__________________________________________________________________________
266 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum)
268 // Returns impact parameter at vertex in bending plane (cm),
269 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
270 // using simple values for dipole magnetic field.
271 // The sign of "BendingMomentum" is the sign of the charge.
272 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
276 //__________________________________________________________________________
277 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam)
279 // Returns signed bending momentum in bending plane (GeV/c),
280 // the sign being the sign of the charge for particles moving forward in Z,
281 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
282 // using simple values for dipole magnetic field.
283 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
287 //__________________________________________________________________________
288 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
290 // Set background file ... for GEANT hits
291 // Must be called after having loaded the firts signal event
292 if (fPrintLevel >= 0) {
293 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
294 << BkgGeantFileName << "''" << endl;}
295 if (strlen(BkgGeantFileName)) {
296 // BkgGeantFileName not empty: try to open the file
297 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
298 fBkgGeantFile = new TFile(BkgGeantFileName);
299 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
300 if (fBkgGeantFile-> IsOpen()) {
301 if (fPrintLevel >= 0) {
302 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
303 << "'' successfully opened" << endl;}
306 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
307 cout << "NOT FOUND: EXIT" << endl;
308 exit(0); // right instruction for exit ????
310 // Arrays for "particles" and "hits"
311 fBkgGeantParticles = new TClonesArray("TParticle", 200);
312 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
313 // Event number to -1 for initialization
314 fBkgGeantEventNumber = -1;
315 // Back to the signal file:
316 // first signal event must have been loaded previously,
317 // otherwise, Segmentation violation at the next instruction
318 // How is it possible to do smething better ????
319 ((gAlice->TreeK())->GetCurrentFile())->cd();
320 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
325 //__________________________________________________________________________
326 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
328 // Get next event in background file for GEANT hits
329 // Goes back to event number 0 when end of file is reached
332 if (fPrintLevel >= 0) {
333 cout << "Enter NextBkgGeantEvent" << endl;}
334 // Clean previous event
335 if(fBkgGeantTK) delete fBkgGeantTK;
337 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
338 if(fBkgGeantTH) delete fBkgGeantTH;
340 if(fBkgGeantHits) fBkgGeantHits->Clear();
341 // Increment event number
342 fBkgGeantEventNumber++;
343 // Get access to Particles and Hits for event from background file
344 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
346 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
347 // Particles: TreeK for event and branch "Particles"
348 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
349 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
351 if (fPrintLevel >= 0) {
352 cout << "Cannot find Kine Tree for background event: " <<
353 fBkgGeantEventNumber << endl;
354 cout << "Goes back to event 0" << endl;
356 fBkgGeantEventNumber = 0;
357 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
358 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
360 cout << "ERROR: cannot find Kine Tree for background event: " <<
361 fBkgGeantEventNumber << endl;
366 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
367 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
368 // Hits: TreeH for event and branch "MUON"
369 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
370 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
372 cout << "ERROR: cannot find Hits Tree for background event: " <<
373 fBkgGeantEventNumber << endl;
376 if (fBkgGeantTH && fBkgGeantHits) {
377 branch = fBkgGeantTH->GetBranch("MUON");
378 if (branch) branch->SetAddress(&fBkgGeantHits);
380 fBkgGeantTH->GetEntries(); // necessary ????
381 // Back to the signal file
382 ((gAlice->TreeK())->GetCurrentFile())->cd();
383 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
387 //__________________________________________________________________________
388 void AliMUONEventReconstructor::EventReconstruct(void)
390 // To reconstruct one event
391 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
392 MakeEventToBeReconstructed();
398 //__________________________________________________________________________
399 void AliMUONEventReconstructor::ResetHitsForRec(void)
401 // To reset the array and the number of HitsForRec,
402 // and also the number of HitsForRec
403 // and the index of the first HitForRec per chamber
404 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
406 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
407 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
411 //__________________________________________________________________________
412 void AliMUONEventReconstructor::ResetSegments(void)
414 // To reset the TClonesArray of segments and the number of Segments
416 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
417 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
423 //__________________________________________________________________________
424 void AliMUONEventReconstructor::ResetTracks(void)
426 // To reset the TClonesArray of reconstructed tracks
427 if (fRecTracksPtr) fRecTracksPtr->Delete();
428 // Delete in order that the Track destructors are called,
429 // hence the space for the TClonesArray of pointers to TrackHit's is freed
434 //__________________________________________________________________________
435 void AliMUONEventReconstructor::ResetTrackHits(void)
437 // To reset the TClonesArray of hits on reconstructed tracks
438 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
443 //__________________________________________________________________________
444 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
446 // To make the list of hits to be reconstructed,
447 // either from the GEANT hits or from the raw clusters
448 // according to the parameter set for the reconstructor
449 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
451 if (fRecGeantHits == 1) {
452 // Reconstruction from GEANT hits
453 // Back to the signal file
454 ((gAlice->TreeK())->GetCurrentFile())->cd();
456 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
457 // Security on MUON ????
458 AddHitsForRecFromGEANT(gAlice->TreeH());
460 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
461 // Sort HitsForRec in increasing order with respect to chamber number
462 SortHitsForRecWithIncreasingChamber();
465 // Reconstruction from raw clusters
466 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
467 // Security on MUON ????
468 // TreeR assumed to be be "prepared" in calling function
469 // by "MUON->GetTreeR(nev)" ????
470 TTree *treeR = gAlice->TreeR();
471 AddHitsForRecFromRawClusters(treeR);
472 // No sorting: it is done automatically in the previous function
474 if (fPrintLevel >= 10) {
475 cout << "end of MakeEventToBeReconstructed" << endl;
476 cout << "NHitsForRec: " << fNHitsForRec << endl;
477 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
478 cout << "chamber(0...): " << ch
479 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
480 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
482 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
483 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
485 cout << "HitForRec index(0...): " << hit << endl;
486 ((*fHitsForRecPtr)[hit])->Dump();
493 //__________________________________________________________________________
494 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
496 // To add to the list of hits for reconstruction
497 // the GEANT signal hits from a hit tree TH.
498 if (fPrintLevel >= 2)
499 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
500 if (TH == NULL) return;
501 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
502 // Security on MUON ????
503 // See whether it could be the same for signal and background ????
504 // Loop over tracks in tree
505 Int_t ntracks = (Int_t) TH->GetEntries();
506 if (fPrintLevel >= 2)
507 cout << "ntracks: " << ntracks << endl;
508 for (Int_t track = 0; track < ntracks; track++) {
513 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
515 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
516 NewHitForRecFromGEANT(mHit,track, hit, 1);
518 } // end of track loop
522 //__________________________________________________________________________
523 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
525 // To add to the list of hits for reconstruction
526 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
527 // How to have only one function "AddHitsForRecFromGEANT" ????
528 if (fPrintLevel >= 2)
529 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
530 if (TH == NULL) return;
531 // Loop over tracks in tree
532 Int_t ntracks = (Int_t) TH->GetEntries();
533 if (fPrintLevel >= 2)
534 cout << "ntracks: " << ntracks << endl;
535 for (Int_t track = 0; track < ntracks; track++) {
536 if (Hits) Hits->Clear();
539 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
540 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
542 } // end of track loop
546 //__________________________________________________________________________
547 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
549 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
550 // with hit number "HitNumber" in the track numbered "TrackNumber",
551 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
552 // Selects hits in tracking (not trigger) chambers.
553 // Takes into account the efficiency (fEfficiency)
554 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
555 // Adds a condition on the radius between RMin and RMax
556 // to better simulate the real chambers.
557 // Returns the pointer to the new hit for reconstruction,
558 // or NULL in case of inefficiency or non tracking chamber or bad radius.
559 // No condition on at most 20 cm from a muon from a resonance
560 // like in Fortran TRACKF_STAT.
561 AliMUONHitForRec* hitForRec;
562 Double_t bendCoor, nonBendCoor, radius;
563 Int_t chamber = Hit->fChamber - 1; // chamber(0...)
564 // only in tracking chambers (fChamber starts at 1)
565 if (chamber >= kMaxMuonTrackingChambers) return NULL;
566 // only if hit is efficient (keep track for checking ????)
567 if (gRandom->Rndm() > fEfficiency) return NULL;
568 // only if radius between RMin and RMax
570 nonBendCoor = Hit->X();
571 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
572 if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
573 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
574 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
576 // add smearing from resolution
577 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
578 hitForRec->SetNonBendingCoor(nonBendCoor
579 + gRandom->Gaus(0., fNonBendingResolution));
580 // more information into HitForRec
581 // resolution: angular effect to be added here ????
582 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
583 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
585 hitForRec->SetHitNumber(HitNumber);
586 hitForRec->SetTHTrack(TrackNumber);
587 hitForRec->SetGeantSignal(Signal);
588 if (fPrintLevel >= 10) {
589 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
591 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
596 //__________________________________________________________________________
597 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
599 // Sort HitsForRec's in increasing order with respect to chamber number.
600 // Uses the function "Compare".
601 // Update the information for HitsForRec per chamber too.
602 Int_t ch, nhits, prevch;
603 fHitsForRecPtr->Sort();
604 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
605 fNHitsForRecPerChamber[ch] = 0;
606 fIndexOfFirstHitForRecPerChamber[ch] = 0;
608 prevch = 0; // previous chamber
609 nhits = 0; // number of hits in current chamber
610 // Loop over HitsForRec
611 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
612 // chamber number (0...)
613 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
614 // increment number of hits in current chamber
615 (fNHitsForRecPerChamber[ch])++;
616 // update index of first HitForRec in current chamber
617 // if chamber number different from previous one
619 fIndexOfFirstHitForRecPerChamber[ch] = hit;
626 // //__________________________________________________________________________
627 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
629 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
630 // // To add to the list of hits for reconstruction
631 // // the (cathode correlated) raw clusters
632 // // No condition added, like in Fortran TRACKF_STAT,
633 // // on the radius between RMin and RMax.
634 // AliMUONHitForRec *hitForRec;
635 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
636 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
637 // // Security on MUON ????
638 // // Loop over tracking chambers
639 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
640 // // number of HitsForRec to 0 for the chamber
641 // fNHitsForRecPerChamber[ch] = 0;
642 // // index of first HitForRec for the chamber
643 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
644 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
645 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
646 // MUON->ResetReconstHits();
648 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
649 // // Loop over (cathode correlated) raw clusters
650 // for (Int_t cor = 0; cor < ncor; cor++) {
651 // AliMUONReconstHit * mCor =
652 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
653 // // new AliMUONHitForRec from (cathode correlated) raw cluster
654 // // and increment number of AliMUONHitForRec's (total and in chamber)
655 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
657 // (fNHitsForRecPerChamber[ch])++;
658 // // more information into HitForRec
659 // hitForRec->SetChamberNumber(ch);
660 // hitForRec->SetHitNumber(cor);
661 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
662 // // could (should) be more exact from chamber geometry ????
663 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
664 // if (fPrintLevel >= 10) {
665 // cout << "chamber (0...): " << ch <<
666 // " cathcorrel (0...): " << cor << endl;
668 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
669 // hitForRec->Dump();}
670 // } // end of cluster loop
671 // } // end of chamber loop
675 //__________________________________________________________________________
676 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
678 // To add to the list of hits for reconstruction all the raw clusters
679 // No condition added, like in Fortran TRACKF_STAT,
680 // on the radius between RMin and RMax.
681 AliMUONHitForRec *hitForRec;
682 AliMUONRawCluster *clus;
684 TClonesArray *rawclusters;
685 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
686 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
687 // Security on MUON ????
688 // Loop over tracking chambers
689 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
690 // number of HitsForRec to 0 for the chamber
691 fNHitsForRecPerChamber[ch] = 0;
692 // index of first HitForRec for the chamber
693 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
694 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
695 rawclusters = pMUON->RawClustAddress(ch);
696 pMUON->ResetRawClusters();
697 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
698 nclus = (Int_t) (rawclusters->GetEntries());
699 // Loop over (cathode correlated) raw clusters
700 for (iclus = 0; iclus < nclus; iclus++) {
701 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
702 // new AliMUONHitForRec from raw cluster
703 // and increment number of AliMUONHitForRec's (total and in chamber)
704 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
706 (fNHitsForRecPerChamber[ch])++;
707 // more information into HitForRec
708 // resolution: info should be already in raw cluster and taken from it ????
709 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
710 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
711 // original raw cluster
712 hitForRec->SetChamberNumber(ch);
713 hitForRec->SetHitNumber(iclus);
714 // Z coordinate of the chamber (cm)
715 // could (should) be more exact from chamber geometry ????
716 hitForRec->SetZ((&(pMUON->Chamber(ch)))->Z());
717 if (fPrintLevel >= 10) {
718 cout << "chamber (0...): " << ch <<
719 " raw cluster (0...): " << iclus << endl;
721 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
723 } // end of cluster loop
724 } // end of chamber loop
728 //__________________________________________________________________________
729 void AliMUONEventReconstructor::MakeSegments(void)
731 // To make the list of segments in all stations,
732 // from the list of hits to be reconstructed
733 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
735 // Loop over stations
736 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
737 MakeSegmentsPerStation(st);
738 if (fPrintLevel >= 10) {
739 cout << "end of MakeSegments" << endl;
740 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
741 cout << "station(0...): " << st
742 << " Segments: " << fNSegments[st]
745 seg < fNSegments[st];
747 cout << "Segment index(0...): " << seg << endl;
748 ((*fSegmentsPtr[st])[seg])->Dump();
755 //__________________________________________________________________________
756 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
758 // To make the list of segments in station number "Station" (0...)
759 // from the list of hits to be reconstructed.
760 // Updates "fNSegments"[Station].
761 // Segments in stations 4 and 5 are sorted
762 // according to increasing absolute value of "impact parameter"
763 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
764 AliMUONSegment *segment;
766 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
767 impactParam = 0., maxImpactParam = 0.; // =0 to avoid compilation warnings.
768 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
769 if (fPrintLevel >= 1)
770 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
771 // first and second chambers (0...) in the station
772 Int_t ch1 = 2 * Station;
774 // variable true for stations downstream of the dipole:
775 // Station(0..4) equal to 3 or 4
776 if ((Station == 3) || (Station == 4)) {
778 // maximum impact parameter (cm) according to fMinBendingMomentum...
780 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
782 else last2st = kFALSE;
783 // extrapolation factor from Z of first chamber to Z of second chamber
784 // dZ to be changed to take into account fine structure of chambers ????
785 Double_t extrapFact =
786 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
787 // index for current segment
788 Int_t segmentIndex = 0;
789 // Loop over HitsForRec in the first chamber of the station
790 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
791 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
793 // pointer to the HitForRec
794 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
796 // on the straight line joining the HitForRec to the vertex (0,0,0),
797 // to the Z of the second chamber of the station
798 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
799 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
800 // Loop over HitsForRec in the second chamber of the station
801 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
802 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
804 // pointer to the HitForRec
805 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
806 // absolute values of distances, in bending and non bending planes,
807 // between the HitForRec in the second chamber
808 // and the previous extrapolation
809 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
810 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
813 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
814 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
815 // absolute value of impact parameter
817 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
819 // check for distances not too large,
820 // and impact parameter not too big if stations downstream of the dipole.
821 // Conditions "distBend" and "impactParam" correlated for these stations ????
822 if ((distBend < fSegmentMaxDistBending[Station]) &&
823 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
824 (!last2st || (impactParam < maxImpactParam))) {
826 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
827 AliMUONSegment(hit1Ptr, hit2Ptr);
828 // update "link" to this segment from the hit in the first chamber
829 if (hit1Ptr->GetNSegments() == 0)
830 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
831 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
832 if (fPrintLevel >= 10) {
833 cout << "segmentIndex(0...): " << segmentIndex
834 << " distBend: " << distBend
835 << " distNonBend: " << distNonBend
838 cout << "HitForRec in first chamber" << endl;
840 cout << "HitForRec in second chamber" << endl;
843 // increment index for current segment
847 } // for (Int_t hit1...
848 fNSegments[Station] = segmentIndex;
849 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
850 // i.e. Station(0..4) 3 or 4, using the function "Compare".
851 // After this sorting, it is impossible to use
852 // the "fNSegments" and "fIndexOfFirstSegment"
853 // of the HitForRec in the first chamber to explore all segments formed with it.
854 // Is this sorting really needed ????
855 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
856 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
857 << fNSegments[Station] << endl;
861 //__________________________________________________________________________
862 void AliMUONEventReconstructor::MakeTracks(void)
864 // To make the tracks,
865 // from the list of segments and points in all stations
866 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
867 // The order may be important for the following Reset's
870 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
871 MakeTrackCandidates();
872 // Follow tracks in stations(1..) 3, 2 and 1
874 // Remove double tracks
875 RemoveDoubleTracks();
879 //__________________________________________________________________________
880 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
882 // To make track candidates with two segments in stations(1..) 4 and 5,
883 // the first segment being pointed to by "BegSegment".
884 // Returns the number of such track candidates.
885 Int_t endStation, iEndSegment, nbCan2Seg;
886 AliMUONSegment *endSegment, *extrapSegment;
887 AliMUONTrack *recTrack;
889 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
890 // Station for the end segment
891 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
892 // multiple scattering factor corresponding to one chamber
894 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
895 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
896 // linear extrapolation to end station
898 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
899 // number of candidates with 2 segments to 0
901 // Loop over segments in the end station
902 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
903 // pointer to segment
904 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
905 // test compatibility between current segment and "extrapSegment"
906 // 4 because 4 quantities in chi2
908 NormalizedChi2WithSegment(extrapSegment,
909 fMaxSigma2Distance)) <= 4.0) {
910 // both segments compatible:
911 // make track candidate from "begSegment" and "endSegment"
912 if (fPrintLevel >= 2)
913 cout << "TrackCandidate with Segment " << iEndSegment <<
914 " in Station(0..) " << endStation << endl;
915 // flag for both segments in one track:
916 // to be done in track constructor ????
917 BegSegment->SetInTrack(kTRUE);
918 endSegment->SetInTrack(kTRUE);
919 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
920 AliMUONTrack(BegSegment, endSegment, this);
922 if (fPrintLevel >= 10) recTrack->RecursiveDump();
923 // increment number of track candidates with 2 segments
926 } // for (iEndSegment = 0;...
927 delete extrapSegment; // should not delete HitForRec's it points to !!!!
931 //__________________________________________________________________________
932 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
934 // To make track candidates with one segment and one point
935 // in stations(1..) 4 and 5,
936 // the segment being pointed to by "BegSegment".
937 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
938 AliMUONHitForRec *extrapHitForRec, *hit;
939 AliMUONTrack *recTrack;
941 if (fPrintLevel >= 1)
942 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
943 // station for the end point
944 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
945 // multiple scattering factor corresponding to one chamber
947 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
948 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
949 // first and second chambers(0..) in the end station
950 ch1 = 2 * endStation;
952 // number of candidates to 0
954 // Loop over chambers of the end station
955 for (ch = ch2; ch >= ch1; ch--) {
956 // linear extrapolation to chamber
958 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
959 // limits for the hit index in the loop
960 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
961 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
962 // Loop over HitForRec's in the chamber
963 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
964 // pointer to HitForRec
965 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
966 // test compatibility between current HitForRec and "extrapHitForRec"
967 // 2 because 2 quantities in chi2
969 NormalizedChi2WithHitForRec(extrapHitForRec,
970 fMaxSigma2Distance)) <= 2.0) {
971 // both HitForRec's compatible:
972 // make track candidate from begSegment and current HitForRec
973 if (fPrintLevel >= 2)
974 cout << "TrackCandidate with HitForRec " << iHit <<
975 " in Chamber(0..) " << ch << endl;
976 // flag for beginning segments in one track:
977 // to be done in track constructor ????
978 BegSegment->SetInTrack(kTRUE);
979 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
980 AliMUONTrack(BegSegment, hit, this);
981 // the right place to eliminate "double counting" ???? how ????
983 if (fPrintLevel >= 10) recTrack->RecursiveDump();
984 // increment number of track candidates
987 } // for (iHit = iHitMin;...
988 delete extrapHitForRec;
989 } // for (ch = ch2;...
990 return nbCan1Seg1Hit;
993 //__________________________________________________________________________
994 void AliMUONEventReconstructor::MakeTrackCandidates(void)
996 // To make track candidates
997 // with at least 3 aligned points in stations(1..) 4 and 5
998 // (two Segment's or one Segment and one HitForRec)
999 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1000 AliMUONSegment *begSegment;
1001 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1002 // Loop over stations(1..) 5 and 4 for the beginning segment
1003 for (begStation = 4; begStation > 2; begStation--) {
1004 // Loop over segments in the beginning station
1005 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1006 // pointer to segment
1007 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1008 if (fPrintLevel >= 2)
1009 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1010 " in Station(0..) " << begStation << endl;
1011 // Look for track candidates with two segments,
1012 // "begSegment" and all compatible segments in other station.
1013 // Only for beginning station(1..) 5
1014 // because candidates with 2 segments have to looked for only once.
1015 if (begStation == 4)
1016 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1017 // Look for track candidates with one segment and one point,
1018 // "begSegment" and all compatible HitForRec's in other station.
1019 // Only if "begSegment" does not belong already to a track candidate.
1020 // Is that a too strong condition ????
1021 if (!(begSegment->GetInTrack()))
1022 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1023 } // for (iBegSegment = 0;...
1024 } // for (begStation = 4;...
1028 //__________________________________________________________________________
1029 void AliMUONEventReconstructor::FollowTracks(void)
1031 // Follow tracks in stations(1..) 3, 2 and 1
1032 // too long: should be made more modular !!!!
1033 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1034 AliMUONSegment *bestSegment, *extrapSegment, *segment;
1035 AliMUONTrack *track, *nextTrack;
1036 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1037 // -1 to avoid compilation warnings
1038 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1039 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1040 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1041 // local maxSigma2Distance, for easy increase in testing
1042 maxSigma2Distance = fMaxSigma2Distance;
1043 if (fPrintLevel >= 2)
1044 cout << "enter FollowTracks" << endl;
1045 // Loop over track candidates
1046 track = (AliMUONTrack*) fRecTracksPtr->First();
1049 // Follow function for each track candidate ????
1051 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1052 if (fPrintLevel >= 2)
1053 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1054 // Fit track candidate
1055 track->SetFitMCS(0); // without multiple Coulomb scattering
1056 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1057 track->SetFitStart(0); // from parameters at vertex
1059 if (fPrintLevel >= 10) {
1060 cout << "FollowTracks: track candidate(0..): " << trackIndex
1061 << " after fit in stations(0..) 3 and 4" << endl;
1062 track->RecursiveDump();
1064 // Loop over stations(1..) 3, 2 and 1
1065 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1066 // otherwise: majority coincidence 2 !!!!
1067 for (station = 2; station >= 0; station--) {
1068 // Track parameters at first track hit (smallest Z)
1069 trackParam1 = ((AliMUONTrackHit*)
1070 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1071 // extrapolation to station
1072 trackParam1->ExtrapToStation(station, trackParam);
1073 extrapSegment = new AliMUONSegment(); // empty segment
1074 // multiple scattering factor corresponding to one chamber
1075 // and momentum in bending plane (not total)
1076 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1077 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1078 // Z difference from previous station
1079 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1080 (&(pMUON->Chamber(2 * station + 2)))->Z();
1081 // Z difference between the two previous stations
1082 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1083 (&(pMUON->Chamber(2 * station + 4)))->Z();
1084 // Z difference between the two chambers in the previous station
1085 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1086 (&(pMUON->Chamber(2 * station + 1)))->Z();
1087 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1089 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1090 extrapSegment->UpdateFromStationTrackParam
1091 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1092 trackParam1->GetInverseBendingMomentum());
1095 if (fPrintLevel >= 10) {
1096 cout << "FollowTracks: track candidate(0..): " << trackIndex
1097 << " Look for segment in station(0..): " << station << endl;
1099 // Loop over segments in station
1100 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1101 // Look for best compatible Segment in station
1102 // should consider all possibilities ????
1103 // multiple scattering ????
1104 // separation in 2 functions: Segment and HitForRec ????
1105 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1106 chi2 = segment->NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1107 if (chi2 < bestChi2) {
1108 // update best Chi2 and Segment if better found
1109 bestSegment = segment;
1114 // best segment found: add it to track candidate
1115 track->AddSegment(bestSegment);
1116 // set track parameters at these two TrakHit's
1117 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1118 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1119 if (fPrintLevel >= 10) {
1120 cout << "FollowTracks: track candidate(0..): " << trackIndex
1121 << " Added segment in station(0..): " << station << endl;
1122 track->RecursiveDump();
1126 // No best segment found:
1127 // Look for best compatible HitForRec in station:
1128 // should consider all possibilities ????
1129 // multiple scattering ???? do about like for extrapSegment !!!!
1130 extrapHit = new AliMUONHitForRec(); // empty hit
1133 if (fPrintLevel >= 10) {
1134 cout << "FollowTracks: track candidate(0..): " << trackIndex
1135 << " Segment not found, look for hit in station(0..): " << station
1138 // Loop over chambers of the station
1139 for (chInStation = 0; chInStation < 2; chInStation++) {
1140 // coordinates of extrapolated hit
1142 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1144 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1145 // resolutions from "extrapSegment"
1146 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1147 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1148 // Loop over hits in the chamber
1149 ch = 2 * station + chInStation;
1150 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1151 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1152 fNHitsForRecPerChamber[ch];
1154 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1155 // condition for hit not already in segment ????
1156 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1157 if (chi2 < bestChi2) {
1158 // update best Chi2 and HitForRec if better found
1161 chBestHit = chInStation;
1166 // best hit found: add it to track candidate
1167 track->AddHitForRec(bestHit);
1168 // set track parameters at this TrackHit
1169 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1170 &(trackParam[chBestHit]));
1171 if (fPrintLevel >= 10) {
1172 cout << "FollowTracks: track candidate(0..): " << trackIndex
1173 << " Added hit in station(0..): " << station << endl;
1174 track->RecursiveDump();
1178 // Remove current track candidate
1179 // and corresponding TrackHit's, ...
1181 delete extrapSegment;
1182 break; // stop the search for this candidate:
1183 // exit from the loop over station
1186 delete extrapSegment;
1187 // Sort track hits according to increasing Z
1188 track->GetTrackHitsPtr()->Sort();
1189 // Update track parameters at first track hit (smallest Z)
1190 trackParam1 = ((AliMUONTrackHit*)
1191 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1193 // with multiple Coulomb scattering if all stations
1194 if (station == 0) track->SetFitMCS(1);
1195 // without multiple Coulomb scattering if not all stations
1196 else track->SetFitMCS(0);
1197 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1198 track->SetFitStart(1); // from parameters at first hit
1200 if (fPrintLevel >= 10) {
1201 cout << "FollowTracks: track candidate(0..): " << trackIndex
1202 << " after fit from station(0..): " << station << " to 4" << endl;
1203 track->RecursiveDump();
1205 // Track extrapolation to the vertex through the absorber (Branson)
1206 // after going through the first station
1208 trackParamVertex = *trackParam1;
1209 (&trackParamVertex)->ExtrapToVertex();
1210 track->SetTrackParamAtVertex(&trackParamVertex);
1211 if (fPrintLevel >= 1) {
1212 cout << "FollowTracks: track candidate(0..): " << trackIndex
1213 << " after extrapolation to vertex" << endl;
1214 track->RecursiveDump();
1217 } // for (station = 2;...
1218 // go really to next track
1221 // Compression of track array (necessary after Remove ????)
1222 fRecTracksPtr->Compress();
1226 //__________________________________________________________________________
1227 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1229 // To remove double tracks.
1230 // Tracks are considered identical
1231 // if they have at least half of their hits in common.
1232 // Among two identical tracks, one keeps the track with the larger number of hits
1233 // or, if these numbers are equal, the track with the minimum Chi2.
1234 AliMUONTrack *track1, *track2, *trackToRemove;
1235 Bool_t identicalTracks;
1236 Int_t hitsInCommon, nHits1, nHits2;
1237 identicalTracks = kTRUE;
1238 while (identicalTracks) {
1239 identicalTracks = kFALSE;
1240 // Loop over first track of the pair
1241 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1242 while (track1 && (!identicalTracks)) {
1243 nHits1 = track1->GetNTrackHits();
1244 // Loop over second track of the pair
1245 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1246 while (track2 && (!identicalTracks)) {
1247 nHits2 = track2->GetNTrackHits();
1248 // number of hits in common between two tracks
1249 hitsInCommon = track1->HitsInCommon(track2);
1250 // check for identical tracks
1251 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1252 identicalTracks = kTRUE;
1253 // decide which track to remove
1254 if (nHits1 > nHits2) trackToRemove = track2;
1255 else if (nHits1 < nHits2) trackToRemove = track1;
1256 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1257 trackToRemove = track2;
1258 else trackToRemove = track1;
1260 trackToRemove->Remove();
1262 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1264 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1270 //__________________________________________________________________________
1271 void AliMUONEventReconstructor::EventDump(void)
1273 // Dump reconstructed event (track parameters at vertex and at first hit),
1274 // and the particle parameters
1276 AliMUONTrack *track;
1277 AliMUONTrackParam *trackParam, *trackParam1;
1278 TClonesArray *particles; // pointer to the particle list
1280 Double_t bendingSlope, nonBendingSlope, pYZ;
1281 Double_t pX, pY, pZ, x, y, z, c;
1282 Int_t np, trackIndex, nTrackHits;
1284 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1285 if (fPrintLevel >= 1) {
1286 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1288 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1289 // Loop over reconstructed tracks
1290 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1291 if (fPrintLevel >= 1)
1292 cout << " track number: " << trackIndex << endl;
1293 // function for each track for modularity ????
1294 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1295 nTrackHits = track->GetNTrackHits();
1296 if (fPrintLevel >= 1)
1297 cout << " number of track hits: " << nTrackHits << endl;
1298 // track parameters at Vertex
1299 trackParam = track->GetTrackParamAtVertex();
1300 x = trackParam->GetNonBendingCoor();
1301 y = trackParam->GetBendingCoor();
1302 z = trackParam->GetZ();
1303 bendingSlope = trackParam->GetBendingSlope();
1304 nonBendingSlope = trackParam->GetNonBendingSlope();
1305 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1306 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1307 pX = pZ * nonBendingSlope;
1308 pY = pZ * bendingSlope;
1309 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1310 if (fPrintLevel >= 1)
1311 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1312 z, x, y, pX, pY, pZ, c);
1314 // track parameters at first hit
1315 trackParam1 = ((AliMUONTrackHit*)
1316 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1317 x = trackParam1->GetNonBendingCoor();
1318 y = trackParam1->GetBendingCoor();
1319 z = trackParam1->GetZ();
1320 bendingSlope = trackParam1->GetBendingSlope();
1321 nonBendingSlope = trackParam1->GetNonBendingSlope();
1322 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1323 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1324 pX = pZ * nonBendingSlope;
1325 pY = pZ * bendingSlope;
1326 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1327 if (fPrintLevel >= 1)
1328 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1329 z, x, y, pX, pY, pZ, c);
1331 // informations about generated particles
1332 particles = gAlice->Particles();
1333 np = particles->GetEntriesFast();
1334 printf(" **** number of generated particles: %d \n", np);
1336 for (Int_t iPart = 0; iPart < np; iPart++) {
1337 p = (TParticle*) particles->UncheckedAt(iPart);
1338 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1339 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());