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 1.25 2001/04/25 14:50:42 gosset
19 Corrections to violations of coding conventions
21 Revision 1.24 2001/03/30 09:37:58 gosset
22 Initialisations of pointers... for GEANT background events in the constructor
24 Revision 1.23 2001/01/26 21:44:45 morsch
25 Use access functions to AliMUONDigit, ... member data.
27 Revision 1.22 2001/01/26 20:00:53 hristov
28 Major upgrade of AliRoot code
29 Revision 1.20 2001/01/08 11:01:02 gosset
30 Modifications used for addendum to Dimuon TDR (JP Cussonneau):
31 *. MaxBendingMomentum to make both a segment and a track (default 500)
32 *. MaxChi2 per degree of freedom to make a track (default 100)
33 *. MinBendingMomentum used also to make a track
34 and not only a segment (default 3)
35 *. wider roads for track search in stations 1 to 3
36 *. extrapolation to actual Z instead of Z(chamber) in FollowTracks
38 - limits on parameters X and Y (+/-500)
39 - covariance matrices in double precision
40 - normalization of covariance matrices before inversion
41 - suppression of Minuit printouts
42 *. correction against memory leak (delete extrapHit) in FollowTracks
43 *. RMax to 10 degrees with Z(chamber) instead of fixed values;
44 RMin and Rmax cuts suppressed in NewHitForRecFromGEANT,
45 because useless with realistic geometry
47 Revision 1.19 2000/11/20 11:24:10 gosset
48 New package for reconstructed tracks (A. Gheata):
49 * tree output in the file "tree_reco.root"
50 * display events and make histograms from this file
52 Revision 1.18 2000/10/26 12:47:03 gosset
53 Real distance between chambers of each station taken into account
54 for the reconstruction parameters "fSegmentMaxDistBending[5]"
56 Revision 1.17 2000/10/24 09:26:20 gosset
59 Revision 1.16 2000/10/24 09:22:35 gosset
60 Method AddHitsForRecFromRawClusters: real Z of raw cluster and not Z of chamber
62 Revision 1.15 2000/10/12 15:17:30 gosset
63 Sign of fSimpleBValue corrected: sign ox Bx and not Bz (thanks to Galina)
65 Revision 1.14 2000/10/04 18:21:26 morsch
68 Revision 1.13 2000/10/02 21:28:09 fca
69 Removal of useless dependecies via forward declarations
71 Revision 1.12 2000/10/02 16:58:29 egangler
72 Cleaning of the code :
75 -> some useless includes removed or replaced by "class" statement
77 Revision 1.11 2000/09/22 09:16:33 hristov
80 Revision 1.10 2000/09/19 09:49:50 gosset
81 AliMUONEventReconstructor package
82 * track extrapolation independent from reco_muon.F, use of AliMagF...
83 * possibility to use new magnetic field (automatic from generated root file)
85 Revision 1.9 2000/07/20 12:45:27 gosset
86 New "EventReconstructor..." structure,
87 hopefully more adapted to tree/streamer.
88 "AliMUONEventReconstructor::RemoveDoubleTracks"
89 to keep only one track among similar ones.
91 Revision 1.8 2000/07/18 16:04:06 gosset
92 AliMUONEventReconstructor package:
93 * a few minor modifications and more comments
95 * right sign for Z of raw clusters
96 * right loop over chambers inside station
97 * symmetrized covariance matrix for measurements (TrackChi2MCS)
98 * right sign of charge in extrapolation (ExtrapToZ)
99 * right zEndAbsorber for Branson correction below 3 degrees
100 * use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
101 * no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
103 Revision 1.7 2000/07/03 12:28:06 gosset
104 Printout at the right place after extrapolation to vertex
106 Revision 1.6 2000/06/30 12:01:06 gosset
107 Correction for hit search in the right chamber (JPC)
109 Revision 1.5 2000/06/30 10:15:48 gosset
110 Changes to EventReconstructor...:
111 precision fit with multiple Coulomb scattering;
112 extrapolation to vertex with Branson correction in absorber (JPC)
114 Revision 1.4 2000/06/27 14:11:36 gosset
115 Corrections against violations of coding conventions
117 Revision 1.3 2000/06/16 07:27:08 gosset
118 To remove problem in running RuleChecker, like in MUON-dev
120 Revision 1.1.2.5 2000/06/16 07:00:26 gosset
121 To remove problem in running RuleChecker
123 Revision 1.1.2.4 2000/06/12 08:00:07 morsch
124 Dummy streamer to solve CINT compilation problem (to be investigated !)
126 Revision 1.1.2.3 2000/06/09 20:59:57 morsch
127 Make includes consistent with new file structure.
129 Revision 1.1.2.2 2000/06/09 12:58:05 gosset
130 Removed comment beginnings in Log sections of .cxx files
131 Suppressed most violations of coding rules
133 Revision 1.1.2.1 2000/06/07 14:44:53 gosset
134 Addition of files for track reconstruction in C++
137 ////////////////////////////////////
139 // MUON event reconstructor in ALICE
141 // This class contains as data:
142 // * the parameters for the event reconstruction
143 // * a pointer to the array of hits to be reconstructed (the event)
144 // * a pointer to the array of segments made with these hits inside each station
145 // * a pointer to the array of reconstructed tracks
147 // It contains as methods, among others:
148 // * MakeEventToBeReconstructed to build the array of hits to be reconstructed
149 // * MakeSegments to build the segments
150 // * MakeTracks to build the tracks
152 ////////////////////////////////////
154 #include <iostream.h> // for cout
155 #include <stdlib.h> // for exit()
160 #include "AliMUONChamber.h"
161 #include "AliMUONEventReconstructor.h"
162 #include "AliMUONHitForRec.h"
163 #include "AliMUONRawCluster.h"
164 #include "AliMUONRecoEvent.h"
165 #include "AliMUONSegment.h"
166 #include "AliMUONTrack.h"
167 #include "AliMUONTrackHit.h"
169 #include "AliRun.h" // for gAlice
171 //************* Defaults parameters for reconstruction
172 static const Double_t kDefaultMinBendingMomentum = 3.0;
173 static const Double_t kDefaultMaxBendingMomentum = 500.0;
174 static const Double_t kDefaultMaxChi2 = 100.0;
175 static const Double_t kDefaultMaxSigma2Distance = 16.0;
176 static const Double_t kDefaultBendingResolution = 0.01;
177 static const Double_t kDefaultNonBendingResolution = 0.144;
178 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
179 // Simple magnetic field:
180 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
181 // Length and Position from reco_muon.F, with opposite sign:
182 // Length = ZMAGEND-ZCOIL
183 // Position = (ZMAGEND+ZCOIL)/2
184 // to be ajusted differently from real magnetic field ????
185 static const Double_t kDefaultSimpleBValue = 7.0;
186 static const Double_t kDefaultSimpleBLength = 428.0;
187 static const Double_t kDefaultSimpleBPosition = 1019.0;
188 static const Int_t kDefaultRecGeantHits = 0;
189 static const Double_t kDefaultEfficiency = 0.95;
191 static const Int_t kDefaultPrintLevel = 0;
193 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
195 //__________________________________________________________________________
196 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
198 // Constructor for class AliMUONEventReconstructor
199 SetReconstructionParametersToDefaults();
200 // Memory allocation for the TClonesArray of hits for reconstruction
201 // Is 10000 the right size ????
202 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
203 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
204 // Memory allocation for the TClonesArray's of segments in stations
205 // Is 2000 the right size ????
206 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
207 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
208 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
210 // Memory allocation for the TClonesArray of reconstructed tracks
211 // Is 10 the right size ????
212 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
213 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
214 // Memory allocation for the TClonesArray of hits on reconstructed tracks
215 // Is 100 the right size ????
216 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
217 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
219 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
221 x[0] = 50.; x[1] = 50.; x[2] = 950.;
222 gAlice->Field()->Field(x, b);
223 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
224 // See how to get fSimple(BValue, BLength, BPosition)
225 // automatically calculated from the actual magnetic field ????
227 if (fPrintLevel >= 0) {
228 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
229 cout << endl << "Magnetic field from root file:" << endl;
230 gAlice->Field()->Dump();
234 // Initializions for GEANT background events
237 fBkgGeantParticles = 0;
240 fBkgGeantEventNumber = -1;
242 // Initialize to 0 pointers to RecoEvent, tree and tree file
250 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
252 // Dummy copy constructor
255 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
257 // Dummy assignment operator
261 //__________________________________________________________________________
262 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
264 // Destructor for class AliMUONEventReconstructor
269 // if (fEventTree) delete fEventTree;
270 if (fRecoEvent) delete fRecoEvent;
271 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
272 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
273 delete fSegmentsPtr[st]; // Correct destruction of everything ????
277 //__________________________________________________________________________
278 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
280 // Set reconstruction parameters to default values
281 // Would be much more convenient with a structure (or class) ????
282 fMinBendingMomentum = kDefaultMinBendingMomentum;
283 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
284 fMaxChi2 = kDefaultMaxChi2;
285 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
287 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
288 // ******** Parameters for making HitsForRec
290 // like in TRACKF_STAT:
291 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
292 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
293 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
294 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
295 2.0 * TMath::Pi() / 180.0;
296 else fRMin[ch] = 30.0;
297 // maximum radius at 10 degrees and Z of chamber
298 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
299 10.0 * TMath::Pi() / 180.0;
302 // ******** Parameters for making segments
303 // should be parametrized ????
304 // according to interval between chambers in a station ????
305 // Maximum distance in non bending plane
306 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
308 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
309 fSegmentMaxDistNonBending[st] = 5. * 0.22;
310 // Maximum distance in bending plane:
311 // values from TRACKF_STAT, corresponding to (J psi 20cm),
312 // scaled to the real distance between chambers in a station
313 fSegmentMaxDistBending[0] = 1.5 *
314 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
315 fSegmentMaxDistBending[1] = 1.5 *
316 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
317 fSegmentMaxDistBending[2] = 3.0 *
318 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
319 fSegmentMaxDistBending[3] = 6.0 *
320 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
321 fSegmentMaxDistBending[4] = 6.0 *
322 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
324 fBendingResolution = kDefaultBendingResolution;
325 fNonBendingResolution = kDefaultNonBendingResolution;
326 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
327 fSimpleBValue = kDefaultSimpleBValue;
328 fSimpleBLength = kDefaultSimpleBLength;
329 fSimpleBPosition = kDefaultSimpleBPosition;
330 fRecGeantHits = kDefaultRecGeantHits;
331 fEfficiency = kDefaultEfficiency;
332 fPrintLevel = kDefaultPrintLevel;
336 //__________________________________________________________________________
337 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
339 // Returns impact parameter at vertex in bending plane (cm),
340 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
341 // using simple values for dipole magnetic field.
342 // The sign of "BendingMomentum" is the sign of the charge.
343 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
347 //__________________________________________________________________________
348 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
350 // Returns signed bending momentum in bending plane (GeV/c),
351 // the sign being the sign of the charge for particles moving forward in Z,
352 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
353 // using simple values for dipole magnetic field.
354 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
358 //__________________________________________________________________________
359 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
361 // Set background file ... for GEANT hits
362 // Must be called after having loaded the firts signal event
363 if (fPrintLevel >= 0) {
364 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
365 << BkgGeantFileName << "''" << endl;}
366 if (strlen(BkgGeantFileName)) {
367 // BkgGeantFileName not empty: try to open the file
368 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
369 fBkgGeantFile = new TFile(BkgGeantFileName);
370 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
371 if (fBkgGeantFile-> IsOpen()) {
372 if (fPrintLevel >= 0) {
373 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
374 << "'' successfully opened" << endl;}
377 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
378 cout << "NOT FOUND: EXIT" << endl;
379 exit(0); // right instruction for exit ????
381 // Arrays for "particles" and "hits"
382 fBkgGeantParticles = new TClonesArray("TParticle", 200);
383 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
384 // Event number to -1 for initialization
385 fBkgGeantEventNumber = -1;
386 // Back to the signal file:
387 // first signal event must have been loaded previously,
388 // otherwise, Segmentation violation at the next instruction
389 // How is it possible to do smething better ????
390 ((gAlice->TreeK())->GetCurrentFile())->cd();
391 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
396 //__________________________________________________________________________
397 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
399 // Get next event in background file for GEANT hits
400 // Goes back to event number 0 when end of file is reached
403 if (fPrintLevel >= 0) {
404 cout << "Enter NextBkgGeantEvent" << endl;}
405 // Clean previous event
406 if(fBkgGeantTK) delete fBkgGeantTK;
408 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
409 if(fBkgGeantTH) delete fBkgGeantTH;
411 if(fBkgGeantHits) fBkgGeantHits->Clear();
412 // Increment event number
413 fBkgGeantEventNumber++;
414 // Get access to Particles and Hits for event from background file
415 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
417 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
418 // Particles: TreeK for event and branch "Particles"
419 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
420 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
422 if (fPrintLevel >= 0) {
423 cout << "Cannot find Kine Tree for background event: " <<
424 fBkgGeantEventNumber << endl;
425 cout << "Goes back to event 0" << endl;
427 fBkgGeantEventNumber = 0;
428 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
429 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
431 cout << "ERROR: cannot find Kine Tree for background event: " <<
432 fBkgGeantEventNumber << endl;
437 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
438 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
439 // Hits: TreeH for event and branch "MUON"
440 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
441 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
443 cout << "ERROR: cannot find Hits Tree for background event: " <<
444 fBkgGeantEventNumber << endl;
447 if (fBkgGeantTH && fBkgGeantHits) {
448 branch = fBkgGeantTH->GetBranch("MUON");
449 if (branch) branch->SetAddress(&fBkgGeantHits);
451 fBkgGeantTH->GetEntries(); // necessary ????
452 // Back to the signal file
453 ((gAlice->TreeK())->GetCurrentFile())->cd();
454 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
458 //__________________________________________________________________________
459 void AliMUONEventReconstructor::EventReconstruct(void)
461 // To reconstruct one event
462 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
463 MakeEventToBeReconstructed();
469 //__________________________________________________________________________
470 void AliMUONEventReconstructor::ResetHitsForRec(void)
472 // To reset the array and the number of HitsForRec,
473 // and also the number of HitsForRec
474 // and the index of the first HitForRec per chamber
475 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
477 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
478 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
482 //__________________________________________________________________________
483 void AliMUONEventReconstructor::ResetSegments(void)
485 // To reset the TClonesArray of segments and the number of Segments
487 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
488 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
494 //__________________________________________________________________________
495 void AliMUONEventReconstructor::ResetTracks(void)
497 // To reset the TClonesArray of reconstructed tracks
498 if (fRecTracksPtr) fRecTracksPtr->Delete();
499 // Delete in order that the Track destructors are called,
500 // hence the space for the TClonesArray of pointers to TrackHit's is freed
505 //__________________________________________________________________________
506 void AliMUONEventReconstructor::ResetTrackHits(void)
508 // To reset the TClonesArray of hits on reconstructed tracks
509 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
514 //__________________________________________________________________________
515 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
517 // To make the list of hits to be reconstructed,
518 // either from the GEANT hits or from the raw clusters
519 // according to the parameter set for the reconstructor
520 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
522 if (fRecGeantHits == 1) {
523 // Reconstruction from GEANT hits
524 // Back to the signal file
525 ((gAlice->TreeK())->GetCurrentFile())->cd();
527 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
528 // Security on MUON ????
529 AddHitsForRecFromGEANT(gAlice->TreeH());
531 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
532 // Sort HitsForRec in increasing order with respect to chamber number
533 SortHitsForRecWithIncreasingChamber();
536 // Reconstruction from raw clusters
537 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
538 // Security on MUON ????
539 // TreeR assumed to be be "prepared" in calling function
540 // by "MUON->GetTreeR(nev)" ????
541 TTree *treeR = gAlice->TreeR();
542 AddHitsForRecFromRawClusters(treeR);
543 // No sorting: it is done automatically in the previous function
545 if (fPrintLevel >= 10) {
546 cout << "end of MakeEventToBeReconstructed" << endl;
547 cout << "NHitsForRec: " << fNHitsForRec << endl;
548 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
549 cout << "chamber(0...): " << ch
550 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
551 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
553 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
554 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
556 cout << "HitForRec index(0...): " << hit << endl;
557 ((*fHitsForRecPtr)[hit])->Dump();
564 //__________________________________________________________________________
565 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
567 // To add to the list of hits for reconstruction
568 // the GEANT signal hits from a hit tree TH.
569 if (fPrintLevel >= 2)
570 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
571 if (TH == NULL) return;
572 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
573 // Security on MUON ????
574 // See whether it could be the same for signal and background ????
575 // Loop over tracks in tree
576 Int_t ntracks = (Int_t) TH->GetEntries();
577 if (fPrintLevel >= 2)
578 cout << "ntracks: " << ntracks << endl;
579 for (Int_t track = 0; track < ntracks; track++) {
584 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
586 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
587 NewHitForRecFromGEANT(mHit,track, hit, 1);
589 } // end of track loop
593 //__________________________________________________________________________
594 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
596 // To add to the list of hits for reconstruction
597 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
598 // How to have only one function "AddHitsForRecFromGEANT" ????
599 if (fPrintLevel >= 2)
600 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
601 if (TH == NULL) return;
602 // Loop over tracks in tree
603 Int_t ntracks = (Int_t) TH->GetEntries();
604 if (fPrintLevel >= 2)
605 cout << "ntracks: " << ntracks << endl;
606 for (Int_t track = 0; track < ntracks; track++) {
607 if (Hits) Hits->Clear();
610 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
611 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
613 } // end of track loop
617 //__________________________________________________________________________
618 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
620 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
621 // with hit number "HitNumber" in the track numbered "TrackNumber",
622 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
623 // Selects hits in tracking (not trigger) chambers.
624 // Takes into account the efficiency (fEfficiency)
625 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
626 // Adds a condition on the radius between RMin and RMax
627 // to better simulate the real chambers.
628 // Returns the pointer to the new hit for reconstruction,
629 // or NULL in case of inefficiency or non tracking chamber or bad radius.
630 // No condition on at most 20 cm from a muon from a resonance
631 // like in Fortran TRACKF_STAT.
632 AliMUONHitForRec* hitForRec;
633 Double_t bendCoor, nonBendCoor, radius;
634 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
635 // only in tracking chambers (fChamber starts at 1)
636 if (chamber >= kMaxMuonTrackingChambers) return NULL;
637 // only if hit is efficient (keep track for checking ????)
638 if (gRandom->Rndm() > fEfficiency) return NULL;
639 // only if radius between RMin and RMax
641 nonBendCoor = Hit->X();
642 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
643 // This cut is not needed with a realistic chamber geometry !!!!
644 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
645 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
646 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
648 // add smearing from resolution
649 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
650 hitForRec->SetNonBendingCoor(nonBendCoor
651 + gRandom->Gaus(0., fNonBendingResolution));
652 // // !!!! without smearing
653 // hitForRec->SetBendingCoor(bendCoor);
654 // hitForRec->SetNonBendingCoor(nonBendCoor);
655 // more information into HitForRec
656 // resolution: angular effect to be added here ????
657 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
658 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
660 hitForRec->SetHitNumber(HitNumber);
661 hitForRec->SetTHTrack(TrackNumber);
662 hitForRec->SetGeantSignal(Signal);
663 if (fPrintLevel >= 10) {
664 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
666 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
671 //__________________________________________________________________________
672 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
674 // Sort HitsForRec's in increasing order with respect to chamber number.
675 // Uses the function "Compare".
676 // Update the information for HitsForRec per chamber too.
677 Int_t ch, nhits, prevch;
678 fHitsForRecPtr->Sort();
679 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
680 fNHitsForRecPerChamber[ch] = 0;
681 fIndexOfFirstHitForRecPerChamber[ch] = 0;
683 prevch = 0; // previous chamber
684 nhits = 0; // number of hits in current chamber
685 // Loop over HitsForRec
686 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
687 // chamber number (0...)
688 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
689 // increment number of hits in current chamber
690 (fNHitsForRecPerChamber[ch])++;
691 // update index of first HitForRec in current chamber
692 // if chamber number different from previous one
694 fIndexOfFirstHitForRecPerChamber[ch] = hit;
701 // //__________________________________________________________________________
702 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
704 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
705 // // To add to the list of hits for reconstruction
706 // // the (cathode correlated) raw clusters
707 // // No condition added, like in Fortran TRACKF_STAT,
708 // // on the radius between RMin and RMax.
709 // AliMUONHitForRec *hitForRec;
710 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
711 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
712 // // Security on MUON ????
713 // // Loop over tracking chambers
714 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
715 // // number of HitsForRec to 0 for the chamber
716 // fNHitsForRecPerChamber[ch] = 0;
717 // // index of first HitForRec for the chamber
718 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
719 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
720 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
721 // MUON->ResetReconstHits();
723 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
724 // // Loop over (cathode correlated) raw clusters
725 // for (Int_t cor = 0; cor < ncor; cor++) {
726 // AliMUONReconstHit * mCor =
727 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
728 // // new AliMUONHitForRec from (cathode correlated) raw cluster
729 // // and increment number of AliMUONHitForRec's (total and in chamber)
730 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
732 // (fNHitsForRecPerChamber[ch])++;
733 // // more information into HitForRec
734 // hitForRec->SetChamberNumber(ch);
735 // hitForRec->SetHitNumber(cor);
736 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
737 // // could (should) be more exact from chamber geometry ????
738 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
739 // if (fPrintLevel >= 10) {
740 // cout << "chamber (0...): " << ch <<
741 // " cathcorrel (0...): " << cor << endl;
743 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
744 // hitForRec->Dump();}
745 // } // end of cluster loop
746 // } // end of chamber loop
750 //__________________________________________________________________________
751 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
753 // To add to the list of hits for reconstruction all the raw clusters
754 // No condition added, like in Fortran TRACKF_STAT,
755 // on the radius between RMin and RMax.
756 AliMUONHitForRec *hitForRec;
757 AliMUONRawCluster *clus;
759 TClonesArray *rawclusters;
760 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
761 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
762 // Security on MUON ????
763 // Loop over tracking chambers
764 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
765 // number of HitsForRec to 0 for the chamber
766 fNHitsForRecPerChamber[ch] = 0;
767 // index of first HitForRec for the chamber
768 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
769 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
770 rawclusters = pMUON->RawClustAddress(ch);
771 pMUON->ResetRawClusters();
772 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
773 nclus = (Int_t) (rawclusters->GetEntries());
774 // Loop over (cathode correlated) raw clusters
775 for (iclus = 0; iclus < nclus; iclus++) {
776 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
777 // new AliMUONHitForRec from raw cluster
778 // and increment number of AliMUONHitForRec's (total and in chamber)
779 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
781 (fNHitsForRecPerChamber[ch])++;
782 // more information into HitForRec
783 // resolution: info should be already in raw cluster and taken from it ????
784 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
785 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
786 // original raw cluster
787 hitForRec->SetChamberNumber(ch);
788 hitForRec->SetHitNumber(iclus);
789 // Z coordinate of the raw cluster (cm)
790 hitForRec->SetZ(clus->fZ[0]);
791 if (fPrintLevel >= 10) {
792 cout << "chamber (0...): " << ch <<
793 " raw cluster (0...): " << iclus << endl;
795 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
797 } // end of cluster loop
798 } // end of chamber loop
802 //__________________________________________________________________________
803 void AliMUONEventReconstructor::MakeSegments(void)
805 // To make the list of segments in all stations,
806 // from the list of hits to be reconstructed
807 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
809 // Loop over stations
810 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
811 MakeSegmentsPerStation(st);
812 if (fPrintLevel >= 10) {
813 cout << "end of MakeSegments" << endl;
814 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
815 cout << "station(0...): " << st
816 << " Segments: " << fNSegments[st]
819 seg < fNSegments[st];
821 cout << "Segment index(0...): " << seg << endl;
822 ((*fSegmentsPtr[st])[seg])->Dump();
829 //__________________________________________________________________________
830 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
832 // To make the list of segments in station number "Station" (0...)
833 // from the list of hits to be reconstructed.
834 // Updates "fNSegments"[Station].
835 // Segments in stations 4 and 5 are sorted
836 // according to increasing absolute value of "impact parameter"
837 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
838 AliMUONSegment *segment;
840 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
841 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
842 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
843 if (fPrintLevel >= 1)
844 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
845 // first and second chambers (0...) in the station
846 Int_t ch1 = 2 * Station;
848 // variable true for stations downstream of the dipole:
849 // Station(0..4) equal to 3 or 4
850 if ((Station == 3) || (Station == 4)) {
852 // maximum impact parameter (cm) according to fMinBendingMomentum...
854 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
855 // minimum impact parameter (cm) according to fMaxBendingMomentum...
857 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
859 else last2st = kFALSE;
860 // extrapolation factor from Z of first chamber to Z of second chamber
861 // dZ to be changed to take into account fine structure of chambers ????
862 Double_t extrapFact =
863 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
864 // index for current segment
865 Int_t segmentIndex = 0;
866 // Loop over HitsForRec in the first chamber of the station
867 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
868 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
870 // pointer to the HitForRec
871 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
873 // on the straight line joining the HitForRec to the vertex (0,0,0),
874 // to the Z of the second chamber of the station
875 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
876 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
877 // Loop over HitsForRec in the second chamber of the station
878 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
879 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
881 // pointer to the HitForRec
882 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
883 // absolute values of distances, in bending and non bending planes,
884 // between the HitForRec in the second chamber
885 // and the previous extrapolation
886 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
887 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
890 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
891 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
892 // absolute value of impact parameter
894 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
896 // check for distances not too large,
897 // and impact parameter not too big if stations downstream of the dipole.
898 // Conditions "distBend" and "impactParam" correlated for these stations ????
899 if ((distBend < fSegmentMaxDistBending[Station]) &&
900 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
901 (!last2st || (impactParam < maxImpactParam)) &&
902 (!last2st || (impactParam > minImpactParam))) {
904 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
905 AliMUONSegment(hit1Ptr, hit2Ptr);
906 // update "link" to this segment from the hit in the first chamber
907 if (hit1Ptr->GetNSegments() == 0)
908 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
909 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
910 if (fPrintLevel >= 10) {
911 cout << "segmentIndex(0...): " << segmentIndex
912 << " distBend: " << distBend
913 << " distNonBend: " << distNonBend
916 cout << "HitForRec in first chamber" << endl;
918 cout << "HitForRec in second chamber" << endl;
921 // increment index for current segment
925 } // for (Int_t hit1...
926 fNSegments[Station] = segmentIndex;
927 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
928 // i.e. Station(0..4) 3 or 4, using the function "Compare".
929 // After this sorting, it is impossible to use
930 // the "fNSegments" and "fIndexOfFirstSegment"
931 // of the HitForRec in the first chamber to explore all segments formed with it.
932 // Is this sorting really needed ????
933 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
934 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
935 << fNSegments[Station] << endl;
939 //__________________________________________________________________________
940 void AliMUONEventReconstructor::MakeTracks(void)
942 // To make the tracks,
943 // from the list of segments and points in all stations
944 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
945 // The order may be important for the following Reset's
948 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
949 MakeTrackCandidates();
950 // Follow tracks in stations(1..) 3, 2 and 1
952 // Remove double tracks
953 RemoveDoubleTracks();
957 //__________________________________________________________________________
958 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
960 // To make track candidates with two segments in stations(1..) 4 and 5,
961 // the first segment being pointed to by "BegSegment".
962 // Returns the number of such track candidates.
963 Int_t endStation, iEndSegment, nbCan2Seg;
964 AliMUONSegment *endSegment, *extrapSegment;
965 AliMUONTrack *recTrack;
967 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
968 // Station for the end segment
969 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
970 // multiple scattering factor corresponding to one chamber
972 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
973 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
974 // linear extrapolation to end station
976 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
977 // number of candidates with 2 segments to 0
979 // Loop over segments in the end station
980 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
981 // pointer to segment
982 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
983 // test compatibility between current segment and "extrapSegment"
984 // 4 because 4 quantities in chi2
986 NormalizedChi2WithSegment(extrapSegment,
987 fMaxSigma2Distance)) <= 4.0) {
988 // both segments compatible:
989 // make track candidate from "begSegment" and "endSegment"
990 if (fPrintLevel >= 2)
991 cout << "TrackCandidate with Segment " << iEndSegment <<
992 " in Station(0..) " << endStation << endl;
993 // flag for both segments in one track:
994 // to be done in track constructor ????
995 BegSegment->SetInTrack(kTRUE);
996 endSegment->SetInTrack(kTRUE);
997 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
998 AliMUONTrack(BegSegment, endSegment, this);
1000 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1001 // increment number of track candidates with 2 segments
1004 } // for (iEndSegment = 0;...
1005 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1009 //__________________________________________________________________________
1010 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1012 // To make track candidates with one segment and one point
1013 // in stations(1..) 4 and 5,
1014 // the segment being pointed to by "BegSegment".
1015 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1016 AliMUONHitForRec *extrapHitForRec, *hit;
1017 AliMUONTrack *recTrack;
1019 if (fPrintLevel >= 1)
1020 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1021 // station for the end point
1022 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1023 // multiple scattering factor corresponding to one chamber
1024 mcsFactor = 0.0136 /
1025 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1026 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1027 // first and second chambers(0..) in the end station
1028 ch1 = 2 * endStation;
1030 // number of candidates to 0
1032 // Loop over chambers of the end station
1033 for (ch = ch2; ch >= ch1; ch--) {
1034 // linear extrapolation to chamber
1036 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1037 // limits for the hit index in the loop
1038 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1039 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1040 // Loop over HitForRec's in the chamber
1041 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1042 // pointer to HitForRec
1043 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1044 // test compatibility between current HitForRec and "extrapHitForRec"
1045 // 2 because 2 quantities in chi2
1047 NormalizedChi2WithHitForRec(extrapHitForRec,
1048 fMaxSigma2Distance)) <= 2.0) {
1049 // both HitForRec's compatible:
1050 // make track candidate from begSegment and current HitForRec
1051 if (fPrintLevel >= 2)
1052 cout << "TrackCandidate with HitForRec " << iHit <<
1053 " in Chamber(0..) " << ch << endl;
1054 // flag for beginning segments in one track:
1055 // to be done in track constructor ????
1056 BegSegment->SetInTrack(kTRUE);
1057 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1058 AliMUONTrack(BegSegment, hit, this);
1059 // the right place to eliminate "double counting" ???? how ????
1061 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1062 // increment number of track candidates
1065 } // for (iHit = iHitMin;...
1066 delete extrapHitForRec;
1067 } // for (ch = ch2;...
1068 return nbCan1Seg1Hit;
1071 //__________________________________________________________________________
1072 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1074 // To make track candidates
1075 // with at least 3 aligned points in stations(1..) 4 and 5
1076 // (two Segment's or one Segment and one HitForRec)
1077 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1078 AliMUONSegment *begSegment;
1079 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1080 // Loop over stations(1..) 5 and 4 for the beginning segment
1081 for (begStation = 4; begStation > 2; begStation--) {
1082 // Loop over segments in the beginning station
1083 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1084 // pointer to segment
1085 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1086 if (fPrintLevel >= 2)
1087 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1088 " in Station(0..) " << begStation << endl;
1089 // Look for track candidates with two segments,
1090 // "begSegment" and all compatible segments in other station.
1091 // Only for beginning station(1..) 5
1092 // because candidates with 2 segments have to looked for only once.
1093 if (begStation == 4)
1094 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1095 // Look for track candidates with one segment and one point,
1096 // "begSegment" and all compatible HitForRec's in other station.
1097 // Only if "begSegment" does not belong already to a track candidate.
1098 // Is that a too strong condition ????
1099 if (!(begSegment->GetInTrack()))
1100 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1101 } // for (iBegSegment = 0;...
1102 } // for (begStation = 4;...
1106 //__________________________________________________________________________
1107 void AliMUONEventReconstructor::FollowTracks(void)
1109 // Follow tracks in stations(1..) 3, 2 and 1
1110 // too long: should be made more modular !!!!
1111 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1112 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1113 AliMUONTrack *track, *nextTrack;
1114 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1115 // -1 to avoid compilation warnings
1116 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1117 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1118 Double_t bendingMomentum, chi2Norm = 0.;
1119 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1120 // local maxSigma2Distance, for easy increase in testing
1121 maxSigma2Distance = fMaxSigma2Distance;
1122 if (fPrintLevel >= 2)
1123 cout << "enter FollowTracks" << endl;
1124 // Loop over track candidates
1125 track = (AliMUONTrack*) fRecTracksPtr->First();
1128 // Follow function for each track candidate ????
1130 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1131 if (fPrintLevel >= 2)
1132 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1133 // Fit track candidate
1134 track->SetFitMCS(0); // without multiple Coulomb scattering
1135 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1136 track->SetFitStart(0); // from parameters at vertex
1138 if (fPrintLevel >= 10) {
1139 cout << "FollowTracks: track candidate(0..): " << trackIndex
1140 << " after fit in stations(0..) 3 and 4" << endl;
1141 track->RecursiveDump();
1143 // Loop over stations(1..) 3, 2 and 1
1144 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1145 // otherwise: majority coincidence 2 !!!!
1146 for (station = 2; station >= 0; station--) {
1147 // Track parameters at first track hit (smallest Z)
1148 trackParam1 = ((AliMUONTrackHit*)
1149 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1150 // extrapolation to station
1151 trackParam1->ExtrapToStation(station, trackParam);
1152 extrapSegment = new AliMUONSegment(); // empty segment
1153 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1154 // multiple scattering factor corresponding to one chamber
1155 // and momentum in bending plane (not total)
1156 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1157 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1158 // Z difference from previous station
1159 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1160 (&(pMUON->Chamber(2 * station + 2)))->Z();
1161 // Z difference between the two previous stations
1162 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1163 (&(pMUON->Chamber(2 * station + 4)))->Z();
1164 // Z difference between the two chambers in the previous station
1165 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1166 (&(pMUON->Chamber(2 * station + 1)))->Z();
1167 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1169 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1170 extrapSegment->UpdateFromStationTrackParam
1171 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1172 trackParam1->GetInverseBendingMomentum());
1173 // same thing for corrected segment
1174 // better to use copy constructor, after checking that it works properly !!!!
1175 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1177 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1178 extrapCorrSegment->UpdateFromStationTrackParam
1179 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1180 trackParam1->GetInverseBendingMomentum());
1183 if (fPrintLevel >= 10) {
1184 cout << "FollowTracks: track candidate(0..): " << trackIndex
1185 << " Look for segment in station(0..): " << station << endl;
1187 // Loop over segments in station
1188 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1189 // Look for best compatible Segment in station
1190 // should consider all possibilities ????
1191 // multiple scattering ????
1192 // separation in 2 functions: Segment and HitForRec ????
1193 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1194 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1195 // according to real Z value of "segment" and slopes of "extrapSegment"
1197 SetBendingCoor(extrapSegment->GetBendingCoor() +
1198 extrapSegment->GetBendingSlope() *
1199 (segment->GetHitForRec1()->GetZ() -
1200 (&(pMUON->Chamber(2 * station)))->Z()));
1202 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1203 extrapSegment->GetNonBendingSlope() *
1204 (segment->GetHitForRec1()->GetZ() -
1205 (&(pMUON->Chamber(2 * station)))->Z()));
1207 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1208 if (chi2 < bestChi2) {
1209 // update best Chi2 and Segment if better found
1210 bestSegment = segment;
1215 // best segment found: add it to track candidate
1216 track->AddSegment(bestSegment);
1217 // set track parameters at these two TrakHit's
1218 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1219 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1220 if (fPrintLevel >= 10) {
1221 cout << "FollowTracks: track candidate(0..): " << trackIndex
1222 << " Added segment in station(0..): " << station << endl;
1223 track->RecursiveDump();
1227 // No best segment found:
1228 // Look for best compatible HitForRec in station:
1229 // should consider all possibilities ????
1230 // multiple scattering ???? do about like for extrapSegment !!!!
1231 extrapHit = new AliMUONHitForRec(); // empty hit
1232 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1235 if (fPrintLevel >= 10) {
1236 cout << "FollowTracks: track candidate(0..): " << trackIndex
1237 << " Segment not found, look for hit in station(0..): " << station
1240 // Loop over chambers of the station
1241 for (chInStation = 0; chInStation < 2; chInStation++) {
1242 // coordinates of extrapolated hit
1244 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1246 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1247 // resolutions from "extrapSegment"
1248 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1249 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1250 // same things for corrected hit
1251 // better to use copy constructor, after checking that it works properly !!!!
1253 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1255 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1256 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1257 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1258 // Loop over hits in the chamber
1259 ch = 2 * station + chInStation;
1260 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1261 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1262 fNHitsForRecPerChamber[ch];
1264 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1265 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1266 // according to real Z value of "hit" and slopes of right "trackParam"
1268 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1269 (&(trackParam[chInStation]))->GetBendingSlope() *
1271 (&(trackParam[chInStation]))->GetZ()));
1273 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1274 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1276 (&(trackParam[chInStation]))->GetZ()));
1277 // condition for hit not already in segment ????
1278 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1279 if (chi2 < bestChi2) {
1280 // update best Chi2 and HitForRec if better found
1283 chBestHit = chInStation;
1288 // best hit found: add it to track candidate
1289 track->AddHitForRec(bestHit);
1290 // set track parameters at this TrackHit
1291 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1292 &(trackParam[chBestHit]));
1293 if (fPrintLevel >= 10) {
1294 cout << "FollowTracks: track candidate(0..): " << trackIndex
1295 << " Added hit in station(0..): " << station << endl;
1296 track->RecursiveDump();
1300 // Remove current track candidate
1301 // and corresponding TrackHit's, ...
1303 delete extrapSegment;
1304 delete extrapCorrSegment;
1306 delete extrapCorrHit;
1307 break; // stop the search for this candidate:
1308 // exit from the loop over station
1311 delete extrapCorrHit;
1313 delete extrapSegment;
1314 delete extrapCorrSegment;
1315 // Sort track hits according to increasing Z
1316 track->GetTrackHitsPtr()->Sort();
1317 // Update track parameters at first track hit (smallest Z)
1318 trackParam1 = ((AliMUONTrackHit*)
1319 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1320 bendingMomentum = 0.;
1321 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1322 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1323 // Track removed if bendingMomentum not in window [min, max]
1324 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1326 break; // stop the search for this candidate:
1327 // exit from the loop over station
1330 // with multiple Coulomb scattering if all stations
1331 if (station == 0) track->SetFitMCS(1);
1332 // without multiple Coulomb scattering if not all stations
1333 else track->SetFitMCS(0);
1334 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1335 track->SetFitStart(1); // from parameters at first hit
1337 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1338 if (numberOfDegFree > 0) {
1339 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1343 // Track removed if normalized chi2 too high
1344 if (chi2Norm > fMaxChi2) {
1346 break; // stop the search for this candidate:
1347 // exit from the loop over station
1349 if (fPrintLevel >= 10) {
1350 cout << "FollowTracks: track candidate(0..): " << trackIndex
1351 << " after fit from station(0..): " << station << " to 4" << endl;
1352 track->RecursiveDump();
1354 // Track extrapolation to the vertex through the absorber (Branson)
1355 // after going through the first station
1357 trackParamVertex = *trackParam1;
1358 (&trackParamVertex)->ExtrapToVertex();
1359 track->SetTrackParamAtVertex(&trackParamVertex);
1360 if (fPrintLevel >= 1) {
1361 cout << "FollowTracks: track candidate(0..): " << trackIndex
1362 << " after extrapolation to vertex" << endl;
1363 track->RecursiveDump();
1366 } // for (station = 2;...
1367 // go really to next track
1370 // Compression of track array (necessary after Remove ????)
1371 fRecTracksPtr->Compress();
1375 //__________________________________________________________________________
1376 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1378 // To remove double tracks.
1379 // Tracks are considered identical
1380 // if they have at least half of their hits in common.
1381 // Among two identical tracks, one keeps the track with the larger number of hits
1382 // or, if these numbers are equal, the track with the minimum Chi2.
1383 AliMUONTrack *track1, *track2, *trackToRemove;
1384 Bool_t identicalTracks;
1385 Int_t hitsInCommon, nHits1, nHits2;
1386 identicalTracks = kTRUE;
1387 while (identicalTracks) {
1388 identicalTracks = kFALSE;
1389 // Loop over first track of the pair
1390 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1391 while (track1 && (!identicalTracks)) {
1392 nHits1 = track1->GetNTrackHits();
1393 // Loop over second track of the pair
1394 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1395 while (track2 && (!identicalTracks)) {
1396 nHits2 = track2->GetNTrackHits();
1397 // number of hits in common between two tracks
1398 hitsInCommon = track1->HitsInCommon(track2);
1399 // check for identical tracks
1400 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1401 identicalTracks = kTRUE;
1402 // decide which track to remove
1403 if (nHits1 > nHits2) trackToRemove = track2;
1404 else if (nHits1 < nHits2) trackToRemove = track1;
1405 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1406 trackToRemove = track2;
1407 else trackToRemove = track1;
1409 trackToRemove->Remove();
1411 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1413 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1419 //__________________________________________________________________________
1420 void AliMUONEventReconstructor::EventDump(void)
1422 // Dump reconstructed event (track parameters at vertex and at first hit),
1423 // and the particle parameters
1425 AliMUONTrack *track;
1426 AliMUONTrackParam *trackParam, *trackParam1;
1428 Double_t bendingSlope, nonBendingSlope, pYZ;
1429 Double_t pX, pY, pZ, x, y, z, c;
1430 Int_t np, trackIndex, nTrackHits;
1432 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1433 if (fPrintLevel >= 1) {
1434 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1436 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1437 // Loop over reconstructed tracks
1438 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1439 if (fPrintLevel >= 1)
1440 cout << " track number: " << trackIndex << endl;
1441 // function for each track for modularity ????
1442 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1443 nTrackHits = track->GetNTrackHits();
1444 if (fPrintLevel >= 1)
1445 cout << " number of track hits: " << nTrackHits << endl;
1446 // track parameters at Vertex
1447 trackParam = track->GetTrackParamAtVertex();
1448 x = trackParam->GetNonBendingCoor();
1449 y = trackParam->GetBendingCoor();
1450 z = trackParam->GetZ();
1451 bendingSlope = trackParam->GetBendingSlope();
1452 nonBendingSlope = trackParam->GetNonBendingSlope();
1453 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1454 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1455 pX = pZ * nonBendingSlope;
1456 pY = pZ * bendingSlope;
1457 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1458 if (fPrintLevel >= 1)
1459 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1460 z, x, y, pX, pY, pZ, c);
1462 // track parameters at first hit
1463 trackParam1 = ((AliMUONTrackHit*)
1464 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1465 x = trackParam1->GetNonBendingCoor();
1466 y = trackParam1->GetBendingCoor();
1467 z = trackParam1->GetZ();
1468 bendingSlope = trackParam1->GetBendingSlope();
1469 nonBendingSlope = trackParam1->GetNonBendingSlope();
1470 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1471 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1472 pX = pZ * nonBendingSlope;
1473 pY = pZ * bendingSlope;
1474 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1475 if (fPrintLevel >= 1)
1476 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1477 z, x, y, pX, pY, pZ, c);
1479 // informations about generated particles
1480 np = gAlice->GetNtrack();
1481 printf(" **** number of generated particles: %d \n", np);
1483 for (Int_t iPart = 0; iPart < np; iPart++) {
1484 p = gAlice->Particle(iPart);
1485 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1486 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1491 void AliMUONEventReconstructor::FillEvent()
1493 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1494 // leaf in the Event branch of TreeRecoEvent tree
1495 cout << "Enter FillEvent() ...\n";
1498 fRecoEvent = new AliMUONRecoEvent();
1500 fRecoEvent->Clear();
1502 //save current directory
1503 TDirectory *current = gDirectory;
1504 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1505 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1506 if (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1507 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1508 TBranch *branch = fEventTree->GetBranch("Event");
1509 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000,1);
1510 branch->SetAutoDelete();
1515 // restore directory