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 1.26 2001/05/03 08:11:31 hristov
19 stdlib.h included to define exit()
21 Revision 1.25 2001/04/25 14:50:42 gosset
22 Corrections to violations of coding conventions
24 Revision 1.24 2001/03/30 09:37:58 gosset
25 Initialisations of pointers... for GEANT background events in the constructor
27 Revision 1.23 2001/01/26 21:44:45 morsch
28 Use access functions to AliMUONDigit, ... member data.
30 Revision 1.22 2001/01/26 20:00:53 hristov
31 Major upgrade of AliRoot code
32 Revision 1.20 2001/01/08 11:01:02 gosset
33 Modifications used for addendum to Dimuon TDR (JP Cussonneau):
34 *. MaxBendingMomentum to make both a segment and a track (default 500)
35 *. MaxChi2 per degree of freedom to make a track (default 100)
36 *. MinBendingMomentum used also to make a track
37 and not only a segment (default 3)
38 *. wider roads for track search in stations 1 to 3
39 *. extrapolation to actual Z instead of Z(chamber) in FollowTracks
41 - limits on parameters X and Y (+/-500)
42 - covariance matrices in double precision
43 - normalization of covariance matrices before inversion
44 - suppression of Minuit printouts
45 *. correction against memory leak (delete extrapHit) in FollowTracks
46 *. RMax to 10 degrees with Z(chamber) instead of fixed values;
47 RMin and Rmax cuts suppressed in NewHitForRecFromGEANT,
48 because useless with realistic geometry
50 Revision 1.19 2000/11/20 11:24:10 gosset
51 New package for reconstructed tracks (A. Gheata):
52 * tree output in the file "tree_reco.root"
53 * display events and make histograms from this file
55 Revision 1.18 2000/10/26 12:47:03 gosset
56 Real distance between chambers of each station taken into account
57 for the reconstruction parameters "fSegmentMaxDistBending[5]"
59 Revision 1.17 2000/10/24 09:26:20 gosset
62 Revision 1.16 2000/10/24 09:22:35 gosset
63 Method AddHitsForRecFromRawClusters: real Z of raw cluster and not Z of chamber
65 Revision 1.15 2000/10/12 15:17:30 gosset
66 Sign of fSimpleBValue corrected: sign ox Bx and not Bz (thanks to Galina)
68 Revision 1.14 2000/10/04 18:21:26 morsch
71 Revision 1.13 2000/10/02 21:28:09 fca
72 Removal of useless dependecies via forward declarations
74 Revision 1.12 2000/10/02 16:58:29 egangler
75 Cleaning of the code :
78 -> some useless includes removed or replaced by "class" statement
80 Revision 1.11 2000/09/22 09:16:33 hristov
83 Revision 1.10 2000/09/19 09:49:50 gosset
84 AliMUONEventReconstructor package
85 * track extrapolation independent from reco_muon.F, use of AliMagF...
86 * possibility to use new magnetic field (automatic from generated root file)
88 Revision 1.9 2000/07/20 12:45:27 gosset
89 New "EventReconstructor..." structure,
90 hopefully more adapted to tree/streamer.
91 "AliMUONEventReconstructor::RemoveDoubleTracks"
92 to keep only one track among similar ones.
94 Revision 1.8 2000/07/18 16:04:06 gosset
95 AliMUONEventReconstructor package:
96 * a few minor modifications and more comments
98 * right sign for Z of raw clusters
99 * right loop over chambers inside station
100 * symmetrized covariance matrix for measurements (TrackChi2MCS)
101 * right sign of charge in extrapolation (ExtrapToZ)
102 * right zEndAbsorber for Branson correction below 3 degrees
103 * use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
104 * no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
106 Revision 1.7 2000/07/03 12:28:06 gosset
107 Printout at the right place after extrapolation to vertex
109 Revision 1.6 2000/06/30 12:01:06 gosset
110 Correction for hit search in the right chamber (JPC)
112 Revision 1.5 2000/06/30 10:15:48 gosset
113 Changes to EventReconstructor...:
114 precision fit with multiple Coulomb scattering;
115 extrapolation to vertex with Branson correction in absorber (JPC)
117 Revision 1.4 2000/06/27 14:11:36 gosset
118 Corrections against violations of coding conventions
120 Revision 1.3 2000/06/16 07:27:08 gosset
121 To remove problem in running RuleChecker, like in MUON-dev
123 Revision 1.1.2.5 2000/06/16 07:00:26 gosset
124 To remove problem in running RuleChecker
126 Revision 1.1.2.4 2000/06/12 08:00:07 morsch
127 Dummy streamer to solve CINT compilation problem (to be investigated !)
129 Revision 1.1.2.3 2000/06/09 20:59:57 morsch
130 Make includes consistent with new file structure.
132 Revision 1.1.2.2 2000/06/09 12:58:05 gosset
133 Removed comment beginnings in Log sections of .cxx files
134 Suppressed most violations of coding rules
136 Revision 1.1.2.1 2000/06/07 14:44:53 gosset
137 Addition of files for track reconstruction in C++
140 ////////////////////////////////////
142 // MUON event reconstructor in ALICE
144 // This class contains as data:
145 // * the parameters for the event reconstruction
146 // * a pointer to the array of hits to be reconstructed (the event)
147 // * a pointer to the array of segments made with these hits inside each station
148 // * a pointer to the array of reconstructed tracks
150 // It contains as methods, among others:
151 // * MakeEventToBeReconstructed to build the array of hits to be reconstructed
152 // * MakeSegments to build the segments
153 // * MakeTracks to build the tracks
155 ////////////////////////////////////
157 #include <iostream.h> // for cout
158 #include <stdlib.h> // for exit()
163 #include "AliMUONChamber.h"
164 #include "AliMUONEventReconstructor.h"
165 #include "AliMUONHitForRec.h"
166 #include "AliMUONRawCluster.h"
167 #include "AliMUONRecoEvent.h"
168 #include "AliMUONSegment.h"
169 #include "AliMUONTrack.h"
170 #include "AliMUONTrackHit.h"
172 #include "AliRun.h" // for gAlice
174 //************* Defaults parameters for reconstruction
175 static const Double_t kDefaultMinBendingMomentum = 3.0;
176 static const Double_t kDefaultMaxBendingMomentum = 500.0;
177 static const Double_t kDefaultMaxChi2 = 100.0;
178 static const Double_t kDefaultMaxSigma2Distance = 16.0;
179 static const Double_t kDefaultBendingResolution = 0.01;
180 static const Double_t kDefaultNonBendingResolution = 0.144;
181 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
182 // Simple magnetic field:
183 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
184 // Length and Position from reco_muon.F, with opposite sign:
185 // Length = ZMAGEND-ZCOIL
186 // Position = (ZMAGEND+ZCOIL)/2
187 // to be ajusted differently from real magnetic field ????
188 static const Double_t kDefaultSimpleBValue = 7.0;
189 static const Double_t kDefaultSimpleBLength = 428.0;
190 static const Double_t kDefaultSimpleBPosition = 1019.0;
191 static const Int_t kDefaultRecGeantHits = 0;
192 static const Double_t kDefaultEfficiency = 0.95;
194 static const Int_t kDefaultPrintLevel = 0;
196 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
198 //__________________________________________________________________________
199 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
201 // Constructor for class AliMUONEventReconstructor
202 SetReconstructionParametersToDefaults();
203 // Memory allocation for the TClonesArray of hits for reconstruction
204 // Is 10000 the right size ????
205 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
206 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
207 // Memory allocation for the TClonesArray's of segments in stations
208 // Is 2000 the right size ????
209 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
210 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
211 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
213 // Memory allocation for the TClonesArray of reconstructed tracks
214 // Is 10 the right size ????
215 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
216 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
217 // Memory allocation for the TClonesArray of hits on reconstructed tracks
218 // Is 100 the right size ????
219 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
220 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
222 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
224 x[0] = 50.; x[1] = 50.; x[2] = 950.;
225 gAlice->Field()->Field(x, b);
226 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
227 // See how to get fSimple(BValue, BLength, BPosition)
228 // automatically calculated from the actual magnetic field ????
230 if (fPrintLevel >= 0) {
231 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
232 cout << endl << "Magnetic field from root file:" << endl;
233 gAlice->Field()->Dump();
237 // Initializions for GEANT background events
240 fBkgGeantParticles = 0;
243 fBkgGeantEventNumber = -1;
245 // Initialize to 0 pointers to RecoEvent, tree and tree file
253 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
255 // Dummy copy constructor
258 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
260 // Dummy assignment operator
264 //__________________________________________________________________________
265 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
267 // Destructor for class AliMUONEventReconstructor
272 // if (fEventTree) delete fEventTree;
273 if (fRecoEvent) delete fRecoEvent;
274 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
275 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
276 delete fSegmentsPtr[st]; // Correct destruction of everything ????
280 //__________________________________________________________________________
281 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
283 // Set reconstruction parameters to default values
284 // Would be much more convenient with a structure (or class) ????
285 fMinBendingMomentum = kDefaultMinBendingMomentum;
286 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
287 fMaxChi2 = kDefaultMaxChi2;
288 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
290 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
291 // ******** Parameters for making HitsForRec
293 // like in TRACKF_STAT:
294 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
295 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
296 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
297 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
298 2.0 * TMath::Pi() / 180.0;
299 else fRMin[ch] = 30.0;
300 // maximum radius at 10 degrees and Z of chamber
301 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
302 10.0 * TMath::Pi() / 180.0;
305 // ******** Parameters for making segments
306 // should be parametrized ????
307 // according to interval between chambers in a station ????
308 // Maximum distance in non bending plane
309 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
311 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
312 fSegmentMaxDistNonBending[st] = 5. * 0.22;
313 // Maximum distance in bending plane:
314 // values from TRACKF_STAT, corresponding to (J psi 20cm),
315 // scaled to the real distance between chambers in a station
316 fSegmentMaxDistBending[0] = 1.5 *
317 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
318 fSegmentMaxDistBending[1] = 1.5 *
319 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
320 fSegmentMaxDistBending[2] = 3.0 *
321 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
322 fSegmentMaxDistBending[3] = 6.0 *
323 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
324 fSegmentMaxDistBending[4] = 6.0 *
325 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
327 fBendingResolution = kDefaultBendingResolution;
328 fNonBendingResolution = kDefaultNonBendingResolution;
329 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
330 fSimpleBValue = kDefaultSimpleBValue;
331 fSimpleBLength = kDefaultSimpleBLength;
332 fSimpleBPosition = kDefaultSimpleBPosition;
333 fRecGeantHits = kDefaultRecGeantHits;
334 fEfficiency = kDefaultEfficiency;
335 fPrintLevel = kDefaultPrintLevel;
339 //__________________________________________________________________________
340 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
342 // Returns impact parameter at vertex in bending plane (cm),
343 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
344 // using simple values for dipole magnetic field.
345 // The sign of "BendingMomentum" is the sign of the charge.
346 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
350 //__________________________________________________________________________
351 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
353 // Returns signed bending momentum in bending plane (GeV/c),
354 // the sign being the sign of the charge for particles moving forward in Z,
355 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
356 // using simple values for dipole magnetic field.
357 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
361 //__________________________________________________________________________
362 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
364 // Set background file ... for GEANT hits
365 // Must be called after having loaded the firts signal event
366 if (fPrintLevel >= 0) {
367 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
368 << BkgGeantFileName << "''" << endl;}
369 if (strlen(BkgGeantFileName)) {
370 // BkgGeantFileName not empty: try to open the file
371 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
372 fBkgGeantFile = new TFile(BkgGeantFileName);
373 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
374 if (fBkgGeantFile-> IsOpen()) {
375 if (fPrintLevel >= 0) {
376 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
377 << "'' successfully opened" << endl;}
380 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
381 cout << "NOT FOUND: EXIT" << endl;
382 exit(0); // right instruction for exit ????
384 // Arrays for "particles" and "hits"
385 fBkgGeantParticles = new TClonesArray("TParticle", 200);
386 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
387 // Event number to -1 for initialization
388 fBkgGeantEventNumber = -1;
389 // Back to the signal file:
390 // first signal event must have been loaded previously,
391 // otherwise, Segmentation violation at the next instruction
392 // How is it possible to do smething better ????
393 ((gAlice->TreeK())->GetCurrentFile())->cd();
394 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
399 //__________________________________________________________________________
400 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
402 // Get next event in background file for GEANT hits
403 // Goes back to event number 0 when end of file is reached
406 if (fPrintLevel >= 0) {
407 cout << "Enter NextBkgGeantEvent" << endl;}
408 // Clean previous event
409 if(fBkgGeantTK) delete fBkgGeantTK;
411 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
412 if(fBkgGeantTH) delete fBkgGeantTH;
414 if(fBkgGeantHits) fBkgGeantHits->Clear();
415 // Increment event number
416 fBkgGeantEventNumber++;
417 // Get access to Particles and Hits for event from background file
418 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
420 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
421 // Particles: TreeK for event and branch "Particles"
422 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
423 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
425 if (fPrintLevel >= 0) {
426 cout << "Cannot find Kine Tree for background event: " <<
427 fBkgGeantEventNumber << endl;
428 cout << "Goes back to event 0" << endl;
430 fBkgGeantEventNumber = 0;
431 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
432 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
434 cout << "ERROR: cannot find Kine Tree for background event: " <<
435 fBkgGeantEventNumber << endl;
440 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
441 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
442 // Hits: TreeH for event and branch "MUON"
443 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
444 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
446 cout << "ERROR: cannot find Hits Tree for background event: " <<
447 fBkgGeantEventNumber << endl;
450 if (fBkgGeantTH && fBkgGeantHits) {
451 branch = fBkgGeantTH->GetBranch("MUON");
452 if (branch) branch->SetAddress(&fBkgGeantHits);
454 fBkgGeantTH->GetEntries(); // necessary ????
455 // Back to the signal file
456 ((gAlice->TreeK())->GetCurrentFile())->cd();
457 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
461 //__________________________________________________________________________
462 void AliMUONEventReconstructor::EventReconstruct(void)
464 // To reconstruct one event
465 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
466 MakeEventToBeReconstructed();
472 //__________________________________________________________________________
473 void AliMUONEventReconstructor::ResetHitsForRec(void)
475 // To reset the array and the number of HitsForRec,
476 // and also the number of HitsForRec
477 // and the index of the first HitForRec per chamber
478 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
480 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
481 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
485 //__________________________________________________________________________
486 void AliMUONEventReconstructor::ResetSegments(void)
488 // To reset the TClonesArray of segments and the number of Segments
490 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
491 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
497 //__________________________________________________________________________
498 void AliMUONEventReconstructor::ResetTracks(void)
500 // To reset the TClonesArray of reconstructed tracks
501 if (fRecTracksPtr) fRecTracksPtr->Delete();
502 // Delete in order that the Track destructors are called,
503 // hence the space for the TClonesArray of pointers to TrackHit's is freed
508 //__________________________________________________________________________
509 void AliMUONEventReconstructor::ResetTrackHits(void)
511 // To reset the TClonesArray of hits on reconstructed tracks
512 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
517 //__________________________________________________________________________
518 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
520 // To make the list of hits to be reconstructed,
521 // either from the GEANT hits or from the raw clusters
522 // according to the parameter set for the reconstructor
523 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
525 if (fRecGeantHits == 1) {
526 // Reconstruction from GEANT hits
527 // Back to the signal file
528 ((gAlice->TreeK())->GetCurrentFile())->cd();
530 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
531 // Security on MUON ????
532 AddHitsForRecFromGEANT(gAlice->TreeH());
534 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
535 // Sort HitsForRec in increasing order with respect to chamber number
536 SortHitsForRecWithIncreasingChamber();
539 // Reconstruction from raw clusters
540 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
541 // Security on MUON ????
542 // TreeR assumed to be be "prepared" in calling function
543 // by "MUON->GetTreeR(nev)" ????
544 TTree *treeR = gAlice->TreeR();
545 AddHitsForRecFromRawClusters(treeR);
546 // No sorting: it is done automatically in the previous function
548 if (fPrintLevel >= 10) {
549 cout << "end of MakeEventToBeReconstructed" << endl;
550 cout << "NHitsForRec: " << fNHitsForRec << endl;
551 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
552 cout << "chamber(0...): " << ch
553 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
554 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
556 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
557 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
559 cout << "HitForRec index(0...): " << hit << endl;
560 ((*fHitsForRecPtr)[hit])->Dump();
567 //__________________________________________________________________________
568 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
570 // To add to the list of hits for reconstruction
571 // the GEANT signal hits from a hit tree TH.
572 if (fPrintLevel >= 2)
573 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
574 if (TH == NULL) return;
575 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
576 // Security on MUON ????
577 // See whether it could be the same for signal and background ????
578 // Loop over tracks in tree
579 Int_t ntracks = (Int_t) TH->GetEntries();
580 if (fPrintLevel >= 2)
581 cout << "ntracks: " << ntracks << endl;
582 for (Int_t track = 0; track < ntracks; track++) {
587 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
589 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
590 NewHitForRecFromGEANT(mHit,track, hit, 1);
592 } // end of track loop
596 //__________________________________________________________________________
597 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
599 // To add to the list of hits for reconstruction
600 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
601 // How to have only one function "AddHitsForRecFromGEANT" ????
602 if (fPrintLevel >= 2)
603 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
604 if (TH == NULL) return;
605 // Loop over tracks in tree
606 Int_t ntracks = (Int_t) TH->GetEntries();
607 if (fPrintLevel >= 2)
608 cout << "ntracks: " << ntracks << endl;
609 for (Int_t track = 0; track < ntracks; track++) {
610 if (Hits) Hits->Clear();
613 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
614 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
616 } // end of track loop
620 //__________________________________________________________________________
621 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
623 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
624 // with hit number "HitNumber" in the track numbered "TrackNumber",
625 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
626 // Selects hits in tracking (not trigger) chambers.
627 // Takes into account the efficiency (fEfficiency)
628 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
629 // Adds a condition on the radius between RMin and RMax
630 // to better simulate the real chambers.
631 // Returns the pointer to the new hit for reconstruction,
632 // or NULL in case of inefficiency or non tracking chamber or bad radius.
633 // No condition on at most 20 cm from a muon from a resonance
634 // like in Fortran TRACKF_STAT.
635 AliMUONHitForRec* hitForRec;
636 Double_t bendCoor, nonBendCoor, radius;
637 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
638 // only in tracking chambers (fChamber starts at 1)
639 if (chamber >= kMaxMuonTrackingChambers) return NULL;
640 // only if hit is efficient (keep track for checking ????)
641 if (gRandom->Rndm() > fEfficiency) return NULL;
642 // only if radius between RMin and RMax
644 nonBendCoor = Hit->X();
645 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
646 // This cut is not needed with a realistic chamber geometry !!!!
647 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
648 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
649 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
651 // add smearing from resolution
652 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
653 hitForRec->SetNonBendingCoor(nonBendCoor
654 + gRandom->Gaus(0., fNonBendingResolution));
655 // // !!!! without smearing
656 // hitForRec->SetBendingCoor(bendCoor);
657 // hitForRec->SetNonBendingCoor(nonBendCoor);
658 // more information into HitForRec
659 // resolution: angular effect to be added here ????
660 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
661 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
663 hitForRec->SetHitNumber(HitNumber);
664 hitForRec->SetTHTrack(TrackNumber);
665 hitForRec->SetGeantSignal(Signal);
666 if (fPrintLevel >= 10) {
667 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
669 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
674 //__________________________________________________________________________
675 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
677 // Sort HitsForRec's in increasing order with respect to chamber number.
678 // Uses the function "Compare".
679 // Update the information for HitsForRec per chamber too.
680 Int_t ch, nhits, prevch;
681 fHitsForRecPtr->Sort();
682 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
683 fNHitsForRecPerChamber[ch] = 0;
684 fIndexOfFirstHitForRecPerChamber[ch] = 0;
686 prevch = 0; // previous chamber
687 nhits = 0; // number of hits in current chamber
688 // Loop over HitsForRec
689 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
690 // chamber number (0...)
691 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
692 // increment number of hits in current chamber
693 (fNHitsForRecPerChamber[ch])++;
694 // update index of first HitForRec in current chamber
695 // if chamber number different from previous one
697 fIndexOfFirstHitForRecPerChamber[ch] = hit;
704 // //__________________________________________________________________________
705 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
707 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
708 // // To add to the list of hits for reconstruction
709 // // the (cathode correlated) raw clusters
710 // // No condition added, like in Fortran TRACKF_STAT,
711 // // on the radius between RMin and RMax.
712 // AliMUONHitForRec *hitForRec;
713 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
714 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
715 // // Security on MUON ????
716 // // Loop over tracking chambers
717 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
718 // // number of HitsForRec to 0 for the chamber
719 // fNHitsForRecPerChamber[ch] = 0;
720 // // index of first HitForRec for the chamber
721 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
722 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
723 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
724 // MUON->ResetReconstHits();
726 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
727 // // Loop over (cathode correlated) raw clusters
728 // for (Int_t cor = 0; cor < ncor; cor++) {
729 // AliMUONReconstHit * mCor =
730 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
731 // // new AliMUONHitForRec from (cathode correlated) raw cluster
732 // // and increment number of AliMUONHitForRec's (total and in chamber)
733 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
735 // (fNHitsForRecPerChamber[ch])++;
736 // // more information into HitForRec
737 // hitForRec->SetChamberNumber(ch);
738 // hitForRec->SetHitNumber(cor);
739 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
740 // // could (should) be more exact from chamber geometry ????
741 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
742 // if (fPrintLevel >= 10) {
743 // cout << "chamber (0...): " << ch <<
744 // " cathcorrel (0...): " << cor << endl;
746 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
747 // hitForRec->Dump();}
748 // } // end of cluster loop
749 // } // end of chamber loop
753 //__________________________________________________________________________
754 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
756 // To add to the list of hits for reconstruction all the raw clusters
757 // No condition added, like in Fortran TRACKF_STAT,
758 // on the radius between RMin and RMax.
759 AliMUONHitForRec *hitForRec;
760 AliMUONRawCluster *clus;
762 TClonesArray *rawclusters;
763 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
764 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
765 // Security on MUON ????
766 // Loop over tracking chambers
767 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
768 // number of HitsForRec to 0 for the chamber
769 fNHitsForRecPerChamber[ch] = 0;
770 // index of first HitForRec for the chamber
771 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
772 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
773 rawclusters = pMUON->RawClustAddress(ch);
774 pMUON->ResetRawClusters();
775 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
776 nclus = (Int_t) (rawclusters->GetEntries());
777 // Loop over (cathode correlated) raw clusters
778 for (iclus = 0; iclus < nclus; iclus++) {
779 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
780 // new AliMUONHitForRec from raw cluster
781 // and increment number of AliMUONHitForRec's (total and in chamber)
782 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
784 (fNHitsForRecPerChamber[ch])++;
785 // more information into HitForRec
786 // resolution: info should be already in raw cluster and taken from it ????
787 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
788 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
789 // original raw cluster
790 hitForRec->SetChamberNumber(ch);
791 hitForRec->SetHitNumber(iclus);
792 // Z coordinate of the raw cluster (cm)
793 hitForRec->SetZ(clus->fZ[0]);
794 if (fPrintLevel >= 10) {
795 cout << "chamber (0...): " << ch <<
796 " raw cluster (0...): " << iclus << endl;
798 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
800 } // end of cluster loop
801 } // end of chamber loop
805 //__________________________________________________________________________
806 void AliMUONEventReconstructor::MakeSegments(void)
808 // To make the list of segments in all stations,
809 // from the list of hits to be reconstructed
810 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
812 // Loop over stations
813 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
814 MakeSegmentsPerStation(st);
815 if (fPrintLevel >= 10) {
816 cout << "end of MakeSegments" << endl;
817 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
818 cout << "station(0...): " << st
819 << " Segments: " << fNSegments[st]
822 seg < fNSegments[st];
824 cout << "Segment index(0...): " << seg << endl;
825 ((*fSegmentsPtr[st])[seg])->Dump();
832 //__________________________________________________________________________
833 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
835 // To make the list of segments in station number "Station" (0...)
836 // from the list of hits to be reconstructed.
837 // Updates "fNSegments"[Station].
838 // Segments in stations 4 and 5 are sorted
839 // according to increasing absolute value of "impact parameter"
840 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
841 AliMUONSegment *segment;
843 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
844 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
845 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
846 if (fPrintLevel >= 1)
847 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
848 // first and second chambers (0...) in the station
849 Int_t ch1 = 2 * Station;
851 // variable true for stations downstream of the dipole:
852 // Station(0..4) equal to 3 or 4
853 if ((Station == 3) || (Station == 4)) {
855 // maximum impact parameter (cm) according to fMinBendingMomentum...
857 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
858 // minimum impact parameter (cm) according to fMaxBendingMomentum...
860 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
862 else last2st = kFALSE;
863 // extrapolation factor from Z of first chamber to Z of second chamber
864 // dZ to be changed to take into account fine structure of chambers ????
865 Double_t extrapFact =
866 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
867 // index for current segment
868 Int_t segmentIndex = 0;
869 // Loop over HitsForRec in the first chamber of the station
870 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
871 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
873 // pointer to the HitForRec
874 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
876 // on the straight line joining the HitForRec to the vertex (0,0,0),
877 // to the Z of the second chamber of the station
878 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
879 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
880 // Loop over HitsForRec in the second chamber of the station
881 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
882 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
884 // pointer to the HitForRec
885 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
886 // absolute values of distances, in bending and non bending planes,
887 // between the HitForRec in the second chamber
888 // and the previous extrapolation
889 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
890 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
893 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
894 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
895 // absolute value of impact parameter
897 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
899 // check for distances not too large,
900 // and impact parameter not too big if stations downstream of the dipole.
901 // Conditions "distBend" and "impactParam" correlated for these stations ????
902 if ((distBend < fSegmentMaxDistBending[Station]) &&
903 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
904 (!last2st || (impactParam < maxImpactParam)) &&
905 (!last2st || (impactParam > minImpactParam))) {
907 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
908 AliMUONSegment(hit1Ptr, hit2Ptr);
909 // update "link" to this segment from the hit in the first chamber
910 if (hit1Ptr->GetNSegments() == 0)
911 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
912 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
913 if (fPrintLevel >= 10) {
914 cout << "segmentIndex(0...): " << segmentIndex
915 << " distBend: " << distBend
916 << " distNonBend: " << distNonBend
919 cout << "HitForRec in first chamber" << endl;
921 cout << "HitForRec in second chamber" << endl;
924 // increment index for current segment
928 } // for (Int_t hit1...
929 fNSegments[Station] = segmentIndex;
930 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
931 // i.e. Station(0..4) 3 or 4, using the function "Compare".
932 // After this sorting, it is impossible to use
933 // the "fNSegments" and "fIndexOfFirstSegment"
934 // of the HitForRec in the first chamber to explore all segments formed with it.
935 // Is this sorting really needed ????
936 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
937 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
938 << fNSegments[Station] << endl;
942 //__________________________________________________________________________
943 void AliMUONEventReconstructor::MakeTracks(void)
945 // To make the tracks,
946 // from the list of segments and points in all stations
947 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
948 // The order may be important for the following Reset's
951 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
952 MakeTrackCandidates();
953 // Follow tracks in stations(1..) 3, 2 and 1
955 // Remove double tracks
956 RemoveDoubleTracks();
960 //__________________________________________________________________________
961 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
963 // To make track candidates with two segments in stations(1..) 4 and 5,
964 // the first segment being pointed to by "BegSegment".
965 // Returns the number of such track candidates.
966 Int_t endStation, iEndSegment, nbCan2Seg;
967 AliMUONSegment *endSegment, *extrapSegment;
968 AliMUONTrack *recTrack;
970 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
971 // Station for the end segment
972 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
973 // multiple scattering factor corresponding to one chamber
975 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
976 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
977 // linear extrapolation to end station
979 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
980 // number of candidates with 2 segments to 0
982 // Loop over segments in the end station
983 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
984 // pointer to segment
985 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
986 // test compatibility between current segment and "extrapSegment"
987 // 4 because 4 quantities in chi2
989 NormalizedChi2WithSegment(extrapSegment,
990 fMaxSigma2Distance)) <= 4.0) {
991 // both segments compatible:
992 // make track candidate from "begSegment" and "endSegment"
993 if (fPrintLevel >= 2)
994 cout << "TrackCandidate with Segment " << iEndSegment <<
995 " in Station(0..) " << endStation << endl;
996 // flag for both segments in one track:
997 // to be done in track constructor ????
998 BegSegment->SetInTrack(kTRUE);
999 endSegment->SetInTrack(kTRUE);
1000 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1001 AliMUONTrack(BegSegment, endSegment, this);
1003 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1004 // increment number of track candidates with 2 segments
1007 } // for (iEndSegment = 0;...
1008 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1012 //__________________________________________________________________________
1013 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1015 // To make track candidates with one segment and one point
1016 // in stations(1..) 4 and 5,
1017 // the segment being pointed to by "BegSegment".
1018 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1019 AliMUONHitForRec *extrapHitForRec, *hit;
1020 AliMUONTrack *recTrack;
1022 if (fPrintLevel >= 1)
1023 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1024 // station for the end point
1025 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1026 // multiple scattering factor corresponding to one chamber
1027 mcsFactor = 0.0136 /
1028 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1029 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1030 // first and second chambers(0..) in the end station
1031 ch1 = 2 * endStation;
1033 // number of candidates to 0
1035 // Loop over chambers of the end station
1036 for (ch = ch2; ch >= ch1; ch--) {
1037 // linear extrapolation to chamber
1039 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1040 // limits for the hit index in the loop
1041 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1042 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1043 // Loop over HitForRec's in the chamber
1044 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1045 // pointer to HitForRec
1046 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1047 // test compatibility between current HitForRec and "extrapHitForRec"
1048 // 2 because 2 quantities in chi2
1050 NormalizedChi2WithHitForRec(extrapHitForRec,
1051 fMaxSigma2Distance)) <= 2.0) {
1052 // both HitForRec's compatible:
1053 // make track candidate from begSegment and current HitForRec
1054 if (fPrintLevel >= 2)
1055 cout << "TrackCandidate with HitForRec " << iHit <<
1056 " in Chamber(0..) " << ch << endl;
1057 // flag for beginning segments in one track:
1058 // to be done in track constructor ????
1059 BegSegment->SetInTrack(kTRUE);
1060 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1061 AliMUONTrack(BegSegment, hit, this);
1062 // the right place to eliminate "double counting" ???? how ????
1064 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1065 // increment number of track candidates
1068 } // for (iHit = iHitMin;...
1069 delete extrapHitForRec;
1070 } // for (ch = ch2;...
1071 return nbCan1Seg1Hit;
1074 //__________________________________________________________________________
1075 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1077 // To make track candidates
1078 // with at least 3 aligned points in stations(1..) 4 and 5
1079 // (two Segment's or one Segment and one HitForRec)
1080 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1081 AliMUONSegment *begSegment;
1082 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1083 // Loop over stations(1..) 5 and 4 for the beginning segment
1084 for (begStation = 4; begStation > 2; begStation--) {
1085 // Loop over segments in the beginning station
1086 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1087 // pointer to segment
1088 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1089 if (fPrintLevel >= 2)
1090 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1091 " in Station(0..) " << begStation << endl;
1092 // Look for track candidates with two segments,
1093 // "begSegment" and all compatible segments in other station.
1094 // Only for beginning station(1..) 5
1095 // because candidates with 2 segments have to looked for only once.
1096 if (begStation == 4)
1097 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1098 // Look for track candidates with one segment and one point,
1099 // "begSegment" and all compatible HitForRec's in other station.
1100 // Only if "begSegment" does not belong already to a track candidate.
1101 // Is that a too strong condition ????
1102 if (!(begSegment->GetInTrack()))
1103 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1104 } // for (iBegSegment = 0;...
1105 } // for (begStation = 4;...
1109 //__________________________________________________________________________
1110 void AliMUONEventReconstructor::FollowTracks(void)
1112 // Follow tracks in stations(1..) 3, 2 and 1
1113 // too long: should be made more modular !!!!
1114 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1115 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1116 AliMUONTrack *track, *nextTrack;
1117 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1118 // -1 to avoid compilation warnings
1119 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1120 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1121 Double_t bendingMomentum, chi2Norm = 0.;
1122 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1123 // local maxSigma2Distance, for easy increase in testing
1124 maxSigma2Distance = fMaxSigma2Distance;
1125 if (fPrintLevel >= 2)
1126 cout << "enter FollowTracks" << endl;
1127 // Loop over track candidates
1128 track = (AliMUONTrack*) fRecTracksPtr->First();
1131 // Follow function for each track candidate ????
1133 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1134 if (fPrintLevel >= 2)
1135 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1136 // Fit track candidate
1137 track->SetFitMCS(0); // without multiple Coulomb scattering
1138 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1139 track->SetFitStart(0); // from parameters at vertex
1141 if (fPrintLevel >= 10) {
1142 cout << "FollowTracks: track candidate(0..): " << trackIndex
1143 << " after fit in stations(0..) 3 and 4" << endl;
1144 track->RecursiveDump();
1146 // Loop over stations(1..) 3, 2 and 1
1147 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1148 // otherwise: majority coincidence 2 !!!!
1149 for (station = 2; station >= 0; station--) {
1150 // Track parameters at first track hit (smallest Z)
1151 trackParam1 = ((AliMUONTrackHit*)
1152 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1153 // extrapolation to station
1154 trackParam1->ExtrapToStation(station, trackParam);
1155 extrapSegment = new AliMUONSegment(); // empty segment
1156 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1157 // multiple scattering factor corresponding to one chamber
1158 // and momentum in bending plane (not total)
1159 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1160 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1161 // Z difference from previous station
1162 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1163 (&(pMUON->Chamber(2 * station + 2)))->Z();
1164 // Z difference between the two previous stations
1165 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1166 (&(pMUON->Chamber(2 * station + 4)))->Z();
1167 // Z difference between the two chambers in the previous station
1168 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1169 (&(pMUON->Chamber(2 * station + 1)))->Z();
1170 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1172 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1173 extrapSegment->UpdateFromStationTrackParam
1174 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1175 trackParam1->GetInverseBendingMomentum());
1176 // same thing for corrected segment
1177 // better to use copy constructor, after checking that it works properly !!!!
1178 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1180 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1181 extrapCorrSegment->UpdateFromStationTrackParam
1182 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1183 trackParam1->GetInverseBendingMomentum());
1186 if (fPrintLevel >= 10) {
1187 cout << "FollowTracks: track candidate(0..): " << trackIndex
1188 << " Look for segment in station(0..): " << station << endl;
1190 // Loop over segments in station
1191 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1192 // Look for best compatible Segment in station
1193 // should consider all possibilities ????
1194 // multiple scattering ????
1195 // separation in 2 functions: Segment and HitForRec ????
1196 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1197 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1198 // according to real Z value of "segment" and slopes of "extrapSegment"
1200 SetBendingCoor(extrapSegment->GetBendingCoor() +
1201 extrapSegment->GetBendingSlope() *
1202 (segment->GetHitForRec1()->GetZ() -
1203 (&(pMUON->Chamber(2 * station)))->Z()));
1205 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1206 extrapSegment->GetNonBendingSlope() *
1207 (segment->GetHitForRec1()->GetZ() -
1208 (&(pMUON->Chamber(2 * station)))->Z()));
1210 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1211 if (chi2 < bestChi2) {
1212 // update best Chi2 and Segment if better found
1213 bestSegment = segment;
1218 // best segment found: add it to track candidate
1219 track->AddSegment(bestSegment);
1220 // set track parameters at these two TrakHit's
1221 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1222 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1223 if (fPrintLevel >= 10) {
1224 cout << "FollowTracks: track candidate(0..): " << trackIndex
1225 << " Added segment in station(0..): " << station << endl;
1226 track->RecursiveDump();
1230 // No best segment found:
1231 // Look for best compatible HitForRec in station:
1232 // should consider all possibilities ????
1233 // multiple scattering ???? do about like for extrapSegment !!!!
1234 extrapHit = new AliMUONHitForRec(); // empty hit
1235 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1238 if (fPrintLevel >= 10) {
1239 cout << "FollowTracks: track candidate(0..): " << trackIndex
1240 << " Segment not found, look for hit in station(0..): " << station
1243 // Loop over chambers of the station
1244 for (chInStation = 0; chInStation < 2; chInStation++) {
1245 // coordinates of extrapolated hit
1247 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1249 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1250 // resolutions from "extrapSegment"
1251 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1252 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1253 // same things for corrected hit
1254 // better to use copy constructor, after checking that it works properly !!!!
1256 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1258 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1259 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1260 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1261 // Loop over hits in the chamber
1262 ch = 2 * station + chInStation;
1263 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1264 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1265 fNHitsForRecPerChamber[ch];
1267 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1268 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1269 // according to real Z value of "hit" and slopes of right "trackParam"
1271 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1272 (&(trackParam[chInStation]))->GetBendingSlope() *
1274 (&(trackParam[chInStation]))->GetZ()));
1276 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1277 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1279 (&(trackParam[chInStation]))->GetZ()));
1280 // condition for hit not already in segment ????
1281 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1282 if (chi2 < bestChi2) {
1283 // update best Chi2 and HitForRec if better found
1286 chBestHit = chInStation;
1291 // best hit found: add it to track candidate
1292 track->AddHitForRec(bestHit);
1293 // set track parameters at this TrackHit
1294 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1295 &(trackParam[chBestHit]));
1296 if (fPrintLevel >= 10) {
1297 cout << "FollowTracks: track candidate(0..): " << trackIndex
1298 << " Added hit in station(0..): " << station << endl;
1299 track->RecursiveDump();
1303 // Remove current track candidate
1304 // and corresponding TrackHit's, ...
1306 delete extrapSegment;
1307 delete extrapCorrSegment;
1309 delete extrapCorrHit;
1310 break; // stop the search for this candidate:
1311 // exit from the loop over station
1314 delete extrapCorrHit;
1316 delete extrapSegment;
1317 delete extrapCorrSegment;
1318 // Sort track hits according to increasing Z
1319 track->GetTrackHitsPtr()->Sort();
1320 // Update track parameters at first track hit (smallest Z)
1321 trackParam1 = ((AliMUONTrackHit*)
1322 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1323 bendingMomentum = 0.;
1324 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1325 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1326 // Track removed if bendingMomentum not in window [min, max]
1327 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1329 break; // stop the search for this candidate:
1330 // exit from the loop over station
1333 // with multiple Coulomb scattering if all stations
1334 if (station == 0) track->SetFitMCS(1);
1335 // without multiple Coulomb scattering if not all stations
1336 else track->SetFitMCS(0);
1337 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1338 track->SetFitStart(1); // from parameters at first hit
1340 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1341 if (numberOfDegFree > 0) {
1342 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1346 // Track removed if normalized chi2 too high
1347 if (chi2Norm > fMaxChi2) {
1349 break; // stop the search for this candidate:
1350 // exit from the loop over station
1352 if (fPrintLevel >= 10) {
1353 cout << "FollowTracks: track candidate(0..): " << trackIndex
1354 << " after fit from station(0..): " << station << " to 4" << endl;
1355 track->RecursiveDump();
1357 // Track extrapolation to the vertex through the absorber (Branson)
1358 // after going through the first station
1360 trackParamVertex = *trackParam1;
1361 (&trackParamVertex)->ExtrapToVertex();
1362 track->SetTrackParamAtVertex(&trackParamVertex);
1363 if (fPrintLevel >= 1) {
1364 cout << "FollowTracks: track candidate(0..): " << trackIndex
1365 << " after extrapolation to vertex" << endl;
1366 track->RecursiveDump();
1369 } // for (station = 2;...
1370 // go really to next track
1373 // Compression of track array (necessary after Remove ????)
1374 fRecTracksPtr->Compress();
1378 //__________________________________________________________________________
1379 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1381 // To remove double tracks.
1382 // Tracks are considered identical
1383 // if they have at least half of their hits in common.
1384 // Among two identical tracks, one keeps the track with the larger number of hits
1385 // or, if these numbers are equal, the track with the minimum Chi2.
1386 AliMUONTrack *track1, *track2, *trackToRemove;
1387 Bool_t identicalTracks;
1388 Int_t hitsInCommon, nHits1, nHits2;
1389 identicalTracks = kTRUE;
1390 while (identicalTracks) {
1391 identicalTracks = kFALSE;
1392 // Loop over first track of the pair
1393 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1394 while (track1 && (!identicalTracks)) {
1395 nHits1 = track1->GetNTrackHits();
1396 // Loop over second track of the pair
1397 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1398 while (track2 && (!identicalTracks)) {
1399 nHits2 = track2->GetNTrackHits();
1400 // number of hits in common between two tracks
1401 hitsInCommon = track1->HitsInCommon(track2);
1402 // check for identical tracks
1403 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1404 identicalTracks = kTRUE;
1405 // decide which track to remove
1406 if (nHits1 > nHits2) trackToRemove = track2;
1407 else if (nHits1 < nHits2) trackToRemove = track1;
1408 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1409 trackToRemove = track2;
1410 else trackToRemove = track1;
1412 trackToRemove->Remove();
1414 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1416 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1422 //__________________________________________________________________________
1423 void AliMUONEventReconstructor::EventDump(void)
1425 // Dump reconstructed event (track parameters at vertex and at first hit),
1426 // and the particle parameters
1428 AliMUONTrack *track;
1429 AliMUONTrackParam *trackParam, *trackParam1;
1431 Double_t bendingSlope, nonBendingSlope, pYZ;
1432 Double_t pX, pY, pZ, x, y, z, c;
1433 Int_t np, trackIndex, nTrackHits;
1435 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1436 if (fPrintLevel >= 1) {
1437 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1439 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1440 // Loop over reconstructed tracks
1441 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1442 if (fPrintLevel >= 1)
1443 cout << " track number: " << trackIndex << endl;
1444 // function for each track for modularity ????
1445 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1446 nTrackHits = track->GetNTrackHits();
1447 if (fPrintLevel >= 1)
1448 cout << " number of track hits: " << nTrackHits << endl;
1449 // track parameters at Vertex
1450 trackParam = track->GetTrackParamAtVertex();
1451 x = trackParam->GetNonBendingCoor();
1452 y = trackParam->GetBendingCoor();
1453 z = trackParam->GetZ();
1454 bendingSlope = trackParam->GetBendingSlope();
1455 nonBendingSlope = trackParam->GetNonBendingSlope();
1456 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1457 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1458 pX = pZ * nonBendingSlope;
1459 pY = pZ * bendingSlope;
1460 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1461 if (fPrintLevel >= 1)
1462 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1463 z, x, y, pX, pY, pZ, c);
1465 // track parameters at first hit
1466 trackParam1 = ((AliMUONTrackHit*)
1467 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1468 x = trackParam1->GetNonBendingCoor();
1469 y = trackParam1->GetBendingCoor();
1470 z = trackParam1->GetZ();
1471 bendingSlope = trackParam1->GetBendingSlope();
1472 nonBendingSlope = trackParam1->GetNonBendingSlope();
1473 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1474 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1475 pX = pZ * nonBendingSlope;
1476 pY = pZ * bendingSlope;
1477 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1478 if (fPrintLevel >= 1)
1479 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1480 z, x, y, pX, pY, pZ, c);
1482 // informations about generated particles
1483 np = gAlice->GetNtrack();
1484 printf(" **** number of generated particles: %d \n", np);
1486 for (Int_t iPart = 0; iPart < np; iPart++) {
1487 p = gAlice->Particle(iPart);
1488 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1489 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1494 void AliMUONEventReconstructor::FillEvent()
1496 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1497 // leaf in the Event branch of TreeRecoEvent tree
1498 cout << "Enter FillEvent() ...\n";
1501 fRecoEvent = new AliMUONRecoEvent();
1503 fRecoEvent->Clear();
1505 //save current directory
1506 TDirectory *current = gDirectory;
1507 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1508 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1509 if (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1510 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1511 TBranch *branch = fEventTree->GetBranch("Event");
1512 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1513 branch->SetAutoDelete();
1518 // restore directory