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 1.22 2001/01/26 20:00:53 hristov
19 Major upgrade of AliRoot code
20 Revision 1.20 2001/01/08 11:01:02 gosset
21 Modifications used for addendum to Dimuon TDR (JP Cussonneau):
22 *. MaxBendingMomentum to make both a segment and a track (default 500)
23 *. MaxChi2 per degree of freedom to make a track (default 100)
24 *. MinBendingMomentum used also to make a track
25 and not only a segment (default 3)
26 *. wider roads for track search in stations 1 to 3
27 *. extrapolation to actual Z instead of Z(chamber) in FollowTracks
29 - limits on parameters X and Y (+/-500)
30 - covariance matrices in double precision
31 - normalization of covariance matrices before inversion
32 - suppression of Minuit printouts
33 *. correction against memory leak (delete extrapHit) in FollowTracks
34 *. RMax to 10 degrees with Z(chamber) instead of fixed values;
35 RMin and Rmax cuts suppressed in NewHitForRecFromGEANT,
36 because useless with realistic geometry
38 Revision 1.19 2000/11/20 11:24:10 gosset
39 New package for reconstructed tracks (A. Gheata):
40 * tree output in the file "tree_reco.root"
41 * display events and make histograms from this file
43 Revision 1.18 2000/10/26 12:47:03 gosset
44 Real distance between chambers of each station taken into account
45 for the reconstruction parameters "fSegmentMaxDistBending[5]"
47 Revision 1.17 2000/10/24 09:26:20 gosset
50 Revision 1.16 2000/10/24 09:22:35 gosset
51 Method AddHitsForRecFromRawClusters: real Z of raw cluster and not Z of chamber
53 Revision 1.15 2000/10/12 15:17:30 gosset
54 Sign of fSimpleBValue corrected: sign ox Bx and not Bz (thanks to Galina)
56 Revision 1.14 2000/10/04 18:21:26 morsch
59 Revision 1.13 2000/10/02 21:28:09 fca
60 Removal of useless dependecies via forward declarations
62 Revision 1.12 2000/10/02 16:58:29 egangler
63 Cleaning of the code :
66 -> some useless includes removed or replaced by "class" statement
68 Revision 1.11 2000/09/22 09:16:33 hristov
71 Revision 1.10 2000/09/19 09:49:50 gosset
72 AliMUONEventReconstructor package
73 * track extrapolation independent from reco_muon.F, use of AliMagF...
74 * possibility to use new magnetic field (automatic from generated root file)
76 Revision 1.9 2000/07/20 12:45:27 gosset
77 New "EventReconstructor..." structure,
78 hopefully more adapted to tree/streamer.
79 "AliMUONEventReconstructor::RemoveDoubleTracks"
80 to keep only one track among similar ones.
82 Revision 1.8 2000/07/18 16:04:06 gosset
83 AliMUONEventReconstructor package:
84 * a few minor modifications and more comments
86 * right sign for Z of raw clusters
87 * right loop over chambers inside station
88 * symmetrized covariance matrix for measurements (TrackChi2MCS)
89 * right sign of charge in extrapolation (ExtrapToZ)
90 * right zEndAbsorber for Branson correction below 3 degrees
91 * use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
92 * no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
94 Revision 1.7 2000/07/03 12:28:06 gosset
95 Printout at the right place after extrapolation to vertex
97 Revision 1.6 2000/06/30 12:01:06 gosset
98 Correction for hit search in the right chamber (JPC)
100 Revision 1.5 2000/06/30 10:15:48 gosset
101 Changes to EventReconstructor...:
102 precision fit with multiple Coulomb scattering;
103 extrapolation to vertex with Branson correction in absorber (JPC)
105 Revision 1.4 2000/06/27 14:11:36 gosset
106 Corrections against violations of coding conventions
108 Revision 1.3 2000/06/16 07:27:08 gosset
109 To remove problem in running RuleChecker, like in MUON-dev
111 Revision 1.1.2.5 2000/06/16 07:00:26 gosset
112 To remove problem in running RuleChecker
114 Revision 1.1.2.4 2000/06/12 08:00:07 morsch
115 Dummy streamer to solve CINT compilation problem (to be investigated !)
117 Revision 1.1.2.3 2000/06/09 20:59:57 morsch
118 Make includes consistent with new file structure.
120 Revision 1.1.2.2 2000/06/09 12:58:05 gosset
121 Removed comment beginnings in Log sections of .cxx files
122 Suppressed most violations of coding rules
124 Revision 1.1.2.1 2000/06/07 14:44:53 gosset
125 Addition of files for track reconstruction in C++
128 //__________________________________________________________________________
130 // MUON event reconstructor in ALICE
132 // This class contains as data:
133 // * the parameters for the event reconstruction
134 // * a pointer to the array of hits to be reconstructed (the event)
135 // * a pointer to the array of segments made with these hits inside each station
136 // * a pointer to the array of reconstructed tracks
138 // It contains as methods, among others:
139 // * MakeEventToBeReconstructed to build the array of hits to be reconstructed
140 // * MakeSegments to build the segments
141 // * MakeTracks to build the tracks
142 //__________________________________________________________________________
144 #include <iostream.h>
151 #include "AliMUONEventReconstructor.h"
153 #include "AliMUONHitForRec.h"
154 #include "AliMUONSegment.h"
155 #include "AliMUONHit.h"
156 #include "AliMUONRawCluster.h"
157 #include "AliMUONTrack.h"
158 #include "AliMUONChamber.h"
159 #include "AliMUONTrackHit.h"
162 #include "TParticle.h"
163 #include "AliMUONRecoEvent.h"
165 //************* Defaults parameters for reconstruction
166 static const Double_t kDefaultMinBendingMomentum = 3.0;
167 static const Double_t kDefaultMaxBendingMomentum = 500.0;
168 static const Double_t kDefaultMaxChi2 = 100.0;
169 static const Double_t kDefaultMaxSigma2Distance = 16.0;
170 static const Double_t kDefaultBendingResolution = 0.01;
171 static const Double_t kDefaultNonBendingResolution = 0.144;
172 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
173 // Simple magnetic field:
174 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
175 // Length and Position from reco_muon.F, with opposite sign:
176 // Length = ZMAGEND-ZCOIL
177 // Position = (ZMAGEND+ZCOIL)/2
178 // to be ajusted differently from real magnetic field ????
179 static const Double_t kDefaultSimpleBValue = 7.0;
180 static const Double_t kDefaultSimpleBLength = 428.0;
181 static const Double_t kDefaultSimpleBPosition = 1019.0;
182 static const Int_t kDefaultRecGeantHits = 0;
183 static const Double_t kDefaultEfficiency = 0.95;
185 static const Int_t kDefaultPrintLevel = 0;
187 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
189 //__________________________________________________________________________
190 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
192 // Constructor for class AliMUONEventReconstructor
193 SetReconstructionParametersToDefaults();
194 // Memory allocation for the TClonesArray of hits for reconstruction
195 // Is 10000 the right size ????
196 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
197 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
198 // Memory allocation for the TClonesArray's of segments in stations
199 // Is 2000 the right size ????
200 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
201 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
202 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
204 // Memory allocation for the TClonesArray of reconstructed tracks
205 // Is 10 the right size ????
206 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
207 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
208 // Memory allocation for the TClonesArray of hits on reconstructed tracks
209 // Is 100 the right size ????
210 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
211 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
213 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
215 x[0] = 50.; x[1] = 50.; x[2] = 950.;
216 gAlice->Field()->Field(x, b);
217 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
218 // See how to get fSimple(BValue, BLength, BPosition)
219 // automatically calculated from the actual magnetic field ????
221 if (fPrintLevel >= 0) {
222 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
223 cout << endl << "Magnetic field from root file:" << endl;
224 gAlice->Field()->Dump();
228 // Initialize to 0 pointers to RecoEvent, tree and tree file
236 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
238 // Dummy copy constructor
241 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
243 // Dummy assignment operator
247 //__________________________________________________________________________
248 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
250 // Destructor for class AliMUONEventReconstructor
255 // if (fEventTree) delete fEventTree;
256 if (fRecoEvent) delete fRecoEvent;
257 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
258 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
259 delete fSegmentsPtr[st]; // Correct destruction of everything ????
263 //__________________________________________________________________________
264 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
266 // Set reconstruction parameters to default values
267 // Would be much more convenient with a structure (or class) ????
268 fMinBendingMomentum = kDefaultMinBendingMomentum;
269 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
270 fMaxChi2 = kDefaultMaxChi2;
271 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
273 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
274 // ******** Parameters for making HitsForRec
276 // like in TRACKF_STAT:
277 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
278 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
279 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
280 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
281 2.0 * TMath::Pi() / 180.0;
282 else fRMin[ch] = 30.0;
283 // maximum radius at 10 degrees and Z of chamber
284 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
285 10.0 * TMath::Pi() / 180.0;
288 // ******** Parameters for making segments
289 // should be parametrized ????
290 // according to interval between chambers in a station ????
291 // Maximum distance in non bending plane
292 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
294 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
295 fSegmentMaxDistNonBending[st] = 5. * 0.22;
296 // Maximum distance in bending plane:
297 // values from TRACKF_STAT, corresponding to (J psi 20cm),
298 // scaled to the real distance between chambers in a station
299 fSegmentMaxDistBending[0] = 1.5 *
300 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
301 fSegmentMaxDistBending[1] = 1.5 *
302 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
303 fSegmentMaxDistBending[2] = 3.0 *
304 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
305 fSegmentMaxDistBending[3] = 6.0 *
306 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
307 fSegmentMaxDistBending[4] = 6.0 *
308 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
310 fBendingResolution = kDefaultBendingResolution;
311 fNonBendingResolution = kDefaultNonBendingResolution;
312 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
313 fSimpleBValue = kDefaultSimpleBValue;
314 fSimpleBLength = kDefaultSimpleBLength;
315 fSimpleBPosition = kDefaultSimpleBPosition;
316 fRecGeantHits = kDefaultRecGeantHits;
317 fEfficiency = kDefaultEfficiency;
318 fPrintLevel = kDefaultPrintLevel;
322 //__________________________________________________________________________
323 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum)
325 // Returns impact parameter at vertex in bending plane (cm),
326 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
327 // using simple values for dipole magnetic field.
328 // The sign of "BendingMomentum" is the sign of the charge.
329 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
333 //__________________________________________________________________________
334 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam)
336 // Returns signed bending momentum in bending plane (GeV/c),
337 // the sign being the sign of the charge for particles moving forward in Z,
338 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
339 // using simple values for dipole magnetic field.
340 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
344 //__________________________________________________________________________
345 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
347 // Set background file ... for GEANT hits
348 // Must be called after having loaded the firts signal event
349 if (fPrintLevel >= 0) {
350 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
351 << BkgGeantFileName << "''" << endl;}
352 if (strlen(BkgGeantFileName)) {
353 // BkgGeantFileName not empty: try to open the file
354 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
355 fBkgGeantFile = new TFile(BkgGeantFileName);
356 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
357 if (fBkgGeantFile-> IsOpen()) {
358 if (fPrintLevel >= 0) {
359 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
360 << "'' successfully opened" << endl;}
363 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
364 cout << "NOT FOUND: EXIT" << endl;
365 exit(0); // right instruction for exit ????
367 // Arrays for "particles" and "hits"
368 fBkgGeantParticles = new TClonesArray("TParticle", 200);
369 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
370 // Event number to -1 for initialization
371 fBkgGeantEventNumber = -1;
372 // Back to the signal file:
373 // first signal event must have been loaded previously,
374 // otherwise, Segmentation violation at the next instruction
375 // How is it possible to do smething better ????
376 ((gAlice->TreeK())->GetCurrentFile())->cd();
377 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
382 //__________________________________________________________________________
383 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
385 // Get next event in background file for GEANT hits
386 // Goes back to event number 0 when end of file is reached
389 if (fPrintLevel >= 0) {
390 cout << "Enter NextBkgGeantEvent" << endl;}
391 // Clean previous event
392 if(fBkgGeantTK) delete fBkgGeantTK;
394 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
395 if(fBkgGeantTH) delete fBkgGeantTH;
397 if(fBkgGeantHits) fBkgGeantHits->Clear();
398 // Increment event number
399 fBkgGeantEventNumber++;
400 // Get access to Particles and Hits for event from background file
401 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
403 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
404 // Particles: TreeK for event and branch "Particles"
405 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
406 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
408 if (fPrintLevel >= 0) {
409 cout << "Cannot find Kine Tree for background event: " <<
410 fBkgGeantEventNumber << endl;
411 cout << "Goes back to event 0" << endl;
413 fBkgGeantEventNumber = 0;
414 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
415 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
417 cout << "ERROR: cannot find Kine Tree for background event: " <<
418 fBkgGeantEventNumber << endl;
423 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
424 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
425 // Hits: TreeH for event and branch "MUON"
426 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
427 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
429 cout << "ERROR: cannot find Hits Tree for background event: " <<
430 fBkgGeantEventNumber << endl;
433 if (fBkgGeantTH && fBkgGeantHits) {
434 branch = fBkgGeantTH->GetBranch("MUON");
435 if (branch) branch->SetAddress(&fBkgGeantHits);
437 fBkgGeantTH->GetEntries(); // necessary ????
438 // Back to the signal file
439 ((gAlice->TreeK())->GetCurrentFile())->cd();
440 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
444 //__________________________________________________________________________
445 void AliMUONEventReconstructor::EventReconstruct(void)
447 // To reconstruct one event
448 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
449 MakeEventToBeReconstructed();
455 //__________________________________________________________________________
456 void AliMUONEventReconstructor::ResetHitsForRec(void)
458 // To reset the array and the number of HitsForRec,
459 // and also the number of HitsForRec
460 // and the index of the first HitForRec per chamber
461 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
463 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
464 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
468 //__________________________________________________________________________
469 void AliMUONEventReconstructor::ResetSegments(void)
471 // To reset the TClonesArray of segments and the number of Segments
473 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
474 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
480 //__________________________________________________________________________
481 void AliMUONEventReconstructor::ResetTracks(void)
483 // To reset the TClonesArray of reconstructed tracks
484 if (fRecTracksPtr) fRecTracksPtr->Delete();
485 // Delete in order that the Track destructors are called,
486 // hence the space for the TClonesArray of pointers to TrackHit's is freed
491 //__________________________________________________________________________
492 void AliMUONEventReconstructor::ResetTrackHits(void)
494 // To reset the TClonesArray of hits on reconstructed tracks
495 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
500 //__________________________________________________________________________
501 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
503 // To make the list of hits to be reconstructed,
504 // either from the GEANT hits or from the raw clusters
505 // according to the parameter set for the reconstructor
506 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
508 if (fRecGeantHits == 1) {
509 // Reconstruction from GEANT hits
510 // Back to the signal file
511 ((gAlice->TreeK())->GetCurrentFile())->cd();
513 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
514 // Security on MUON ????
515 AddHitsForRecFromGEANT(gAlice->TreeH());
517 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
518 // Sort HitsForRec in increasing order with respect to chamber number
519 SortHitsForRecWithIncreasingChamber();
522 // Reconstruction from raw clusters
523 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
524 // Security on MUON ????
525 // TreeR assumed to be be "prepared" in calling function
526 // by "MUON->GetTreeR(nev)" ????
527 TTree *treeR = gAlice->TreeR();
528 AddHitsForRecFromRawClusters(treeR);
529 // No sorting: it is done automatically in the previous function
531 if (fPrintLevel >= 10) {
532 cout << "end of MakeEventToBeReconstructed" << endl;
533 cout << "NHitsForRec: " << fNHitsForRec << endl;
534 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
535 cout << "chamber(0...): " << ch
536 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
537 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
539 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
540 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
542 cout << "HitForRec index(0...): " << hit << endl;
543 ((*fHitsForRecPtr)[hit])->Dump();
550 //__________________________________________________________________________
551 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
553 // To add to the list of hits for reconstruction
554 // the GEANT signal hits from a hit tree TH.
555 if (fPrintLevel >= 2)
556 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
557 if (TH == NULL) return;
558 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
559 // Security on MUON ????
560 // See whether it could be the same for signal and background ????
561 // Loop over tracks in tree
562 Int_t ntracks = (Int_t) TH->GetEntries();
563 if (fPrintLevel >= 2)
564 cout << "ntracks: " << ntracks << endl;
565 for (Int_t track = 0; track < ntracks; track++) {
570 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
572 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
573 NewHitForRecFromGEANT(mHit,track, hit, 1);
575 } // end of track loop
579 //__________________________________________________________________________
580 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
582 // To add to the list of hits for reconstruction
583 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
584 // How to have only one function "AddHitsForRecFromGEANT" ????
585 if (fPrintLevel >= 2)
586 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
587 if (TH == NULL) return;
588 // Loop over tracks in tree
589 Int_t ntracks = (Int_t) TH->GetEntries();
590 if (fPrintLevel >= 2)
591 cout << "ntracks: " << ntracks << endl;
592 for (Int_t track = 0; track < ntracks; track++) {
593 if (Hits) Hits->Clear();
596 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
597 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
599 } // end of track loop
603 //__________________________________________________________________________
604 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
606 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
607 // with hit number "HitNumber" in the track numbered "TrackNumber",
608 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
609 // Selects hits in tracking (not trigger) chambers.
610 // Takes into account the efficiency (fEfficiency)
611 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
612 // Adds a condition on the radius between RMin and RMax
613 // to better simulate the real chambers.
614 // Returns the pointer to the new hit for reconstruction,
615 // or NULL in case of inefficiency or non tracking chamber or bad radius.
616 // No condition on at most 20 cm from a muon from a resonance
617 // like in Fortran TRACKF_STAT.
618 AliMUONHitForRec* hitForRec;
619 Double_t bendCoor, nonBendCoor, radius;
620 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
621 // only in tracking chambers (fChamber starts at 1)
622 if (chamber >= kMaxMuonTrackingChambers) return NULL;
623 // only if hit is efficient (keep track for checking ????)
624 if (gRandom->Rndm() > fEfficiency) return NULL;
625 // only if radius between RMin and RMax
627 nonBendCoor = Hit->X();
628 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
629 // This cut is not needed with a realistic chamber geometry !!!!
630 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
631 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
632 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
634 // add smearing from resolution
635 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
636 hitForRec->SetNonBendingCoor(nonBendCoor
637 + gRandom->Gaus(0., fNonBendingResolution));
638 // // !!!! without smearing
639 // hitForRec->SetBendingCoor(bendCoor);
640 // hitForRec->SetNonBendingCoor(nonBendCoor);
641 // more information into HitForRec
642 // resolution: angular effect to be added here ????
643 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
644 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
646 hitForRec->SetHitNumber(HitNumber);
647 hitForRec->SetTHTrack(TrackNumber);
648 hitForRec->SetGeantSignal(Signal);
649 if (fPrintLevel >= 10) {
650 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
652 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
657 //__________________________________________________________________________
658 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
660 // Sort HitsForRec's in increasing order with respect to chamber number.
661 // Uses the function "Compare".
662 // Update the information for HitsForRec per chamber too.
663 Int_t ch, nhits, prevch;
664 fHitsForRecPtr->Sort();
665 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
666 fNHitsForRecPerChamber[ch] = 0;
667 fIndexOfFirstHitForRecPerChamber[ch] = 0;
669 prevch = 0; // previous chamber
670 nhits = 0; // number of hits in current chamber
671 // Loop over HitsForRec
672 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
673 // chamber number (0...)
674 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
675 // increment number of hits in current chamber
676 (fNHitsForRecPerChamber[ch])++;
677 // update index of first HitForRec in current chamber
678 // if chamber number different from previous one
680 fIndexOfFirstHitForRecPerChamber[ch] = hit;
687 // //__________________________________________________________________________
688 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
690 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
691 // // To add to the list of hits for reconstruction
692 // // the (cathode correlated) raw clusters
693 // // No condition added, like in Fortran TRACKF_STAT,
694 // // on the radius between RMin and RMax.
695 // AliMUONHitForRec *hitForRec;
696 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
697 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
698 // // Security on MUON ????
699 // // Loop over tracking chambers
700 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
701 // // number of HitsForRec to 0 for the chamber
702 // fNHitsForRecPerChamber[ch] = 0;
703 // // index of first HitForRec for the chamber
704 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
705 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
706 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
707 // MUON->ResetReconstHits();
709 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
710 // // Loop over (cathode correlated) raw clusters
711 // for (Int_t cor = 0; cor < ncor; cor++) {
712 // AliMUONReconstHit * mCor =
713 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
714 // // new AliMUONHitForRec from (cathode correlated) raw cluster
715 // // and increment number of AliMUONHitForRec's (total and in chamber)
716 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
718 // (fNHitsForRecPerChamber[ch])++;
719 // // more information into HitForRec
720 // hitForRec->SetChamberNumber(ch);
721 // hitForRec->SetHitNumber(cor);
722 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
723 // // could (should) be more exact from chamber geometry ????
724 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
725 // if (fPrintLevel >= 10) {
726 // cout << "chamber (0...): " << ch <<
727 // " cathcorrel (0...): " << cor << endl;
729 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
730 // hitForRec->Dump();}
731 // } // end of cluster loop
732 // } // end of chamber loop
736 //__________________________________________________________________________
737 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
739 // To add to the list of hits for reconstruction all the raw clusters
740 // No condition added, like in Fortran TRACKF_STAT,
741 // on the radius between RMin and RMax.
742 AliMUONHitForRec *hitForRec;
743 AliMUONRawCluster *clus;
745 TClonesArray *rawclusters;
746 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
747 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
748 // Security on MUON ????
749 // Loop over tracking chambers
750 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
751 // number of HitsForRec to 0 for the chamber
752 fNHitsForRecPerChamber[ch] = 0;
753 // index of first HitForRec for the chamber
754 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
755 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
756 rawclusters = pMUON->RawClustAddress(ch);
757 pMUON->ResetRawClusters();
758 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
759 nclus = (Int_t) (rawclusters->GetEntries());
760 // Loop over (cathode correlated) raw clusters
761 for (iclus = 0; iclus < nclus; iclus++) {
762 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
763 // new AliMUONHitForRec from raw cluster
764 // and increment number of AliMUONHitForRec's (total and in chamber)
765 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
767 (fNHitsForRecPerChamber[ch])++;
768 // more information into HitForRec
769 // resolution: info should be already in raw cluster and taken from it ????
770 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
771 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
772 // original raw cluster
773 hitForRec->SetChamberNumber(ch);
774 hitForRec->SetHitNumber(iclus);
775 // Z coordinate of the raw cluster (cm)
776 hitForRec->SetZ(clus->fZ[0]);
777 if (fPrintLevel >= 10) {
778 cout << "chamber (0...): " << ch <<
779 " raw cluster (0...): " << iclus << endl;
781 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
783 } // end of cluster loop
784 } // end of chamber loop
788 //__________________________________________________________________________
789 void AliMUONEventReconstructor::MakeSegments(void)
791 // To make the list of segments in all stations,
792 // from the list of hits to be reconstructed
793 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
795 // Loop over stations
796 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
797 MakeSegmentsPerStation(st);
798 if (fPrintLevel >= 10) {
799 cout << "end of MakeSegments" << endl;
800 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
801 cout << "station(0...): " << st
802 << " Segments: " << fNSegments[st]
805 seg < fNSegments[st];
807 cout << "Segment index(0...): " << seg << endl;
808 ((*fSegmentsPtr[st])[seg])->Dump();
815 //__________________________________________________________________________
816 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
818 // To make the list of segments in station number "Station" (0...)
819 // from the list of hits to be reconstructed.
820 // Updates "fNSegments"[Station].
821 // Segments in stations 4 and 5 are sorted
822 // according to increasing absolute value of "impact parameter"
823 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
824 AliMUONSegment *segment;
826 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
827 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
828 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
829 if (fPrintLevel >= 1)
830 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
831 // first and second chambers (0...) in the station
832 Int_t ch1 = 2 * Station;
834 // variable true for stations downstream of the dipole:
835 // Station(0..4) equal to 3 or 4
836 if ((Station == 3) || (Station == 4)) {
838 // maximum impact parameter (cm) according to fMinBendingMomentum...
840 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
841 // minimum impact parameter (cm) according to fMaxBendingMomentum...
843 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
845 else last2st = kFALSE;
846 // extrapolation factor from Z of first chamber to Z of second chamber
847 // dZ to be changed to take into account fine structure of chambers ????
848 Double_t extrapFact =
849 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
850 // index for current segment
851 Int_t segmentIndex = 0;
852 // Loop over HitsForRec in the first chamber of the station
853 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
854 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
856 // pointer to the HitForRec
857 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
859 // on the straight line joining the HitForRec to the vertex (0,0,0),
860 // to the Z of the second chamber of the station
861 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
862 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
863 // Loop over HitsForRec in the second chamber of the station
864 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
865 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
867 // pointer to the HitForRec
868 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
869 // absolute values of distances, in bending and non bending planes,
870 // between the HitForRec in the second chamber
871 // and the previous extrapolation
872 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
873 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
876 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
877 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
878 // absolute value of impact parameter
880 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
882 // check for distances not too large,
883 // and impact parameter not too big if stations downstream of the dipole.
884 // Conditions "distBend" and "impactParam" correlated for these stations ????
885 if ((distBend < fSegmentMaxDistBending[Station]) &&
886 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
887 (!last2st || (impactParam < maxImpactParam)) &&
888 (!last2st || (impactParam > minImpactParam))) {
890 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
891 AliMUONSegment(hit1Ptr, hit2Ptr);
892 // update "link" to this segment from the hit in the first chamber
893 if (hit1Ptr->GetNSegments() == 0)
894 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
895 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
896 if (fPrintLevel >= 10) {
897 cout << "segmentIndex(0...): " << segmentIndex
898 << " distBend: " << distBend
899 << " distNonBend: " << distNonBend
902 cout << "HitForRec in first chamber" << endl;
904 cout << "HitForRec in second chamber" << endl;
907 // increment index for current segment
911 } // for (Int_t hit1...
912 fNSegments[Station] = segmentIndex;
913 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
914 // i.e. Station(0..4) 3 or 4, using the function "Compare".
915 // After this sorting, it is impossible to use
916 // the "fNSegments" and "fIndexOfFirstSegment"
917 // of the HitForRec in the first chamber to explore all segments formed with it.
918 // Is this sorting really needed ????
919 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
920 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
921 << fNSegments[Station] << endl;
925 //__________________________________________________________________________
926 void AliMUONEventReconstructor::MakeTracks(void)
928 // To make the tracks,
929 // from the list of segments and points in all stations
930 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
931 // The order may be important for the following Reset's
934 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
935 MakeTrackCandidates();
936 // Follow tracks in stations(1..) 3, 2 and 1
938 // Remove double tracks
939 RemoveDoubleTracks();
943 //__________________________________________________________________________
944 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
946 // To make track candidates with two segments in stations(1..) 4 and 5,
947 // the first segment being pointed to by "BegSegment".
948 // Returns the number of such track candidates.
949 Int_t endStation, iEndSegment, nbCan2Seg;
950 AliMUONSegment *endSegment, *extrapSegment;
951 AliMUONTrack *recTrack;
953 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
954 // Station for the end segment
955 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
956 // multiple scattering factor corresponding to one chamber
958 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
959 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
960 // linear extrapolation to end station
962 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
963 // number of candidates with 2 segments to 0
965 // Loop over segments in the end station
966 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
967 // pointer to segment
968 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
969 // test compatibility between current segment and "extrapSegment"
970 // 4 because 4 quantities in chi2
972 NormalizedChi2WithSegment(extrapSegment,
973 fMaxSigma2Distance)) <= 4.0) {
974 // both segments compatible:
975 // make track candidate from "begSegment" and "endSegment"
976 if (fPrintLevel >= 2)
977 cout << "TrackCandidate with Segment " << iEndSegment <<
978 " in Station(0..) " << endStation << endl;
979 // flag for both segments in one track:
980 // to be done in track constructor ????
981 BegSegment->SetInTrack(kTRUE);
982 endSegment->SetInTrack(kTRUE);
983 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
984 AliMUONTrack(BegSegment, endSegment, this);
986 if (fPrintLevel >= 10) recTrack->RecursiveDump();
987 // increment number of track candidates with 2 segments
990 } // for (iEndSegment = 0;...
991 delete extrapSegment; // should not delete HitForRec's it points to !!!!
995 //__________________________________________________________________________
996 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
998 // To make track candidates with one segment and one point
999 // in stations(1..) 4 and 5,
1000 // the segment being pointed to by "BegSegment".
1001 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1002 AliMUONHitForRec *extrapHitForRec, *hit;
1003 AliMUONTrack *recTrack;
1005 if (fPrintLevel >= 1)
1006 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1007 // station for the end point
1008 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1009 // multiple scattering factor corresponding to one chamber
1010 mcsFactor = 0.0136 /
1011 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1012 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1013 // first and second chambers(0..) in the end station
1014 ch1 = 2 * endStation;
1016 // number of candidates to 0
1018 // Loop over chambers of the end station
1019 for (ch = ch2; ch >= ch1; ch--) {
1020 // linear extrapolation to chamber
1022 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1023 // limits for the hit index in the loop
1024 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1025 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1026 // Loop over HitForRec's in the chamber
1027 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1028 // pointer to HitForRec
1029 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1030 // test compatibility between current HitForRec and "extrapHitForRec"
1031 // 2 because 2 quantities in chi2
1033 NormalizedChi2WithHitForRec(extrapHitForRec,
1034 fMaxSigma2Distance)) <= 2.0) {
1035 // both HitForRec's compatible:
1036 // make track candidate from begSegment and current HitForRec
1037 if (fPrintLevel >= 2)
1038 cout << "TrackCandidate with HitForRec " << iHit <<
1039 " in Chamber(0..) " << ch << endl;
1040 // flag for beginning segments in one track:
1041 // to be done in track constructor ????
1042 BegSegment->SetInTrack(kTRUE);
1043 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1044 AliMUONTrack(BegSegment, hit, this);
1045 // the right place to eliminate "double counting" ???? how ????
1047 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1048 // increment number of track candidates
1051 } // for (iHit = iHitMin;...
1052 delete extrapHitForRec;
1053 } // for (ch = ch2;...
1054 return nbCan1Seg1Hit;
1057 //__________________________________________________________________________
1058 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1060 // To make track candidates
1061 // with at least 3 aligned points in stations(1..) 4 and 5
1062 // (two Segment's or one Segment and one HitForRec)
1063 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1064 AliMUONSegment *begSegment;
1065 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1066 // Loop over stations(1..) 5 and 4 for the beginning segment
1067 for (begStation = 4; begStation > 2; begStation--) {
1068 // Loop over segments in the beginning station
1069 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1070 // pointer to segment
1071 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1072 if (fPrintLevel >= 2)
1073 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1074 " in Station(0..) " << begStation << endl;
1075 // Look for track candidates with two segments,
1076 // "begSegment" and all compatible segments in other station.
1077 // Only for beginning station(1..) 5
1078 // because candidates with 2 segments have to looked for only once.
1079 if (begStation == 4)
1080 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1081 // Look for track candidates with one segment and one point,
1082 // "begSegment" and all compatible HitForRec's in other station.
1083 // Only if "begSegment" does not belong already to a track candidate.
1084 // Is that a too strong condition ????
1085 if (!(begSegment->GetInTrack()))
1086 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1087 } // for (iBegSegment = 0;...
1088 } // for (begStation = 4;...
1092 //__________________________________________________________________________
1093 void AliMUONEventReconstructor::FollowTracks(void)
1095 // Follow tracks in stations(1..) 3, 2 and 1
1096 // too long: should be made more modular !!!!
1097 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1098 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1099 AliMUONTrack *track, *nextTrack;
1100 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1101 // -1 to avoid compilation warnings
1102 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1103 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1104 Double_t bendingMomentum, chi2Norm = 0.;
1105 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1106 // local maxSigma2Distance, for easy increase in testing
1107 maxSigma2Distance = fMaxSigma2Distance;
1108 if (fPrintLevel >= 2)
1109 cout << "enter FollowTracks" << endl;
1110 // Loop over track candidates
1111 track = (AliMUONTrack*) fRecTracksPtr->First();
1114 // Follow function for each track candidate ????
1116 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1117 if (fPrintLevel >= 2)
1118 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1119 // Fit track candidate
1120 track->SetFitMCS(0); // without multiple Coulomb scattering
1121 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1122 track->SetFitStart(0); // from parameters at vertex
1124 if (fPrintLevel >= 10) {
1125 cout << "FollowTracks: track candidate(0..): " << trackIndex
1126 << " after fit in stations(0..) 3 and 4" << endl;
1127 track->RecursiveDump();
1129 // Loop over stations(1..) 3, 2 and 1
1130 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1131 // otherwise: majority coincidence 2 !!!!
1132 for (station = 2; station >= 0; station--) {
1133 // Track parameters at first track hit (smallest Z)
1134 trackParam1 = ((AliMUONTrackHit*)
1135 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1136 // extrapolation to station
1137 trackParam1->ExtrapToStation(station, trackParam);
1138 extrapSegment = new AliMUONSegment(); // empty segment
1139 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1140 // multiple scattering factor corresponding to one chamber
1141 // and momentum in bending plane (not total)
1142 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1143 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1144 // Z difference from previous station
1145 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1146 (&(pMUON->Chamber(2 * station + 2)))->Z();
1147 // Z difference between the two previous stations
1148 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1149 (&(pMUON->Chamber(2 * station + 4)))->Z();
1150 // Z difference between the two chambers in the previous station
1151 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1152 (&(pMUON->Chamber(2 * station + 1)))->Z();
1153 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1155 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1156 extrapSegment->UpdateFromStationTrackParam
1157 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1158 trackParam1->GetInverseBendingMomentum());
1159 // same thing for corrected segment
1160 // better to use copy constructor, after checking that it works properly !!!!
1161 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1163 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1164 extrapCorrSegment->UpdateFromStationTrackParam
1165 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1166 trackParam1->GetInverseBendingMomentum());
1169 if (fPrintLevel >= 10) {
1170 cout << "FollowTracks: track candidate(0..): " << trackIndex
1171 << " Look for segment in station(0..): " << station << endl;
1173 // Loop over segments in station
1174 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1175 // Look for best compatible Segment in station
1176 // should consider all possibilities ????
1177 // multiple scattering ????
1178 // separation in 2 functions: Segment and HitForRec ????
1179 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1180 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1181 // according to real Z value of "segment" and slopes of "extrapSegment"
1183 SetBendingCoor(extrapSegment->GetBendingCoor() +
1184 extrapSegment->GetBendingSlope() *
1185 (segment->GetHitForRec1()->GetZ() -
1186 (&(pMUON->Chamber(2 * station)))->Z()));
1188 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1189 extrapSegment->GetNonBendingSlope() *
1190 (segment->GetHitForRec1()->GetZ() -
1191 (&(pMUON->Chamber(2 * station)))->Z()));
1193 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1194 if (chi2 < bestChi2) {
1195 // update best Chi2 and Segment if better found
1196 bestSegment = segment;
1201 // best segment found: add it to track candidate
1202 track->AddSegment(bestSegment);
1203 // set track parameters at these two TrakHit's
1204 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1205 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1206 if (fPrintLevel >= 10) {
1207 cout << "FollowTracks: track candidate(0..): " << trackIndex
1208 << " Added segment in station(0..): " << station << endl;
1209 track->RecursiveDump();
1213 // No best segment found:
1214 // Look for best compatible HitForRec in station:
1215 // should consider all possibilities ????
1216 // multiple scattering ???? do about like for extrapSegment !!!!
1217 extrapHit = new AliMUONHitForRec(); // empty hit
1218 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1221 if (fPrintLevel >= 10) {
1222 cout << "FollowTracks: track candidate(0..): " << trackIndex
1223 << " Segment not found, look for hit in station(0..): " << station
1226 // Loop over chambers of the station
1227 for (chInStation = 0; chInStation < 2; chInStation++) {
1228 // coordinates of extrapolated hit
1230 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1232 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1233 // resolutions from "extrapSegment"
1234 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1235 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1236 // same things for corrected hit
1237 // better to use copy constructor, after checking that it works properly !!!!
1239 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1241 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1242 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1243 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1244 // Loop over hits in the chamber
1245 ch = 2 * station + chInStation;
1246 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1247 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1248 fNHitsForRecPerChamber[ch];
1250 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1251 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1252 // according to real Z value of "hit" and slopes of right "trackParam"
1254 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1255 (&(trackParam[chInStation]))->GetBendingSlope() *
1257 (&(trackParam[chInStation]))->GetZ()));
1259 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1260 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1262 (&(trackParam[chInStation]))->GetZ()));
1263 // condition for hit not already in segment ????
1264 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1265 if (chi2 < bestChi2) {
1266 // update best Chi2 and HitForRec if better found
1269 chBestHit = chInStation;
1274 // best hit found: add it to track candidate
1275 track->AddHitForRec(bestHit);
1276 // set track parameters at this TrackHit
1277 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1278 &(trackParam[chBestHit]));
1279 if (fPrintLevel >= 10) {
1280 cout << "FollowTracks: track candidate(0..): " << trackIndex
1281 << " Added hit in station(0..): " << station << endl;
1282 track->RecursiveDump();
1286 // Remove current track candidate
1287 // and corresponding TrackHit's, ...
1289 delete extrapSegment;
1290 delete extrapCorrSegment;
1292 delete extrapCorrHit;
1293 break; // stop the search for this candidate:
1294 // exit from the loop over station
1297 delete extrapCorrHit;
1299 delete extrapSegment;
1300 delete extrapCorrSegment;
1301 // Sort track hits according to increasing Z
1302 track->GetTrackHitsPtr()->Sort();
1303 // Update track parameters at first track hit (smallest Z)
1304 trackParam1 = ((AliMUONTrackHit*)
1305 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1306 bendingMomentum = 0.;
1307 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1308 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1309 // Track removed if bendingMomentum not in window [min, max]
1310 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1312 break; // stop the search for this candidate:
1313 // exit from the loop over station
1316 // with multiple Coulomb scattering if all stations
1317 if (station == 0) track->SetFitMCS(1);
1318 // without multiple Coulomb scattering if not all stations
1319 else track->SetFitMCS(0);
1320 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1321 track->SetFitStart(1); // from parameters at first hit
1323 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1324 if (numberOfDegFree > 0) {
1325 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1329 // Track removed if normalized chi2 too high
1330 if (chi2Norm > fMaxChi2) {
1332 break; // stop the search for this candidate:
1333 // exit from the loop over station
1335 if (fPrintLevel >= 10) {
1336 cout << "FollowTracks: track candidate(0..): " << trackIndex
1337 << " after fit from station(0..): " << station << " to 4" << endl;
1338 track->RecursiveDump();
1340 // Track extrapolation to the vertex through the absorber (Branson)
1341 // after going through the first station
1343 trackParamVertex = *trackParam1;
1344 (&trackParamVertex)->ExtrapToVertex();
1345 track->SetTrackParamAtVertex(&trackParamVertex);
1346 if (fPrintLevel >= 1) {
1347 cout << "FollowTracks: track candidate(0..): " << trackIndex
1348 << " after extrapolation to vertex" << endl;
1349 track->RecursiveDump();
1352 } // for (station = 2;...
1353 // go really to next track
1356 // Compression of track array (necessary after Remove ????)
1357 fRecTracksPtr->Compress();
1361 //__________________________________________________________________________
1362 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1364 // To remove double tracks.
1365 // Tracks are considered identical
1366 // if they have at least half of their hits in common.
1367 // Among two identical tracks, one keeps the track with the larger number of hits
1368 // or, if these numbers are equal, the track with the minimum Chi2.
1369 AliMUONTrack *track1, *track2, *trackToRemove;
1370 Bool_t identicalTracks;
1371 Int_t hitsInCommon, nHits1, nHits2;
1372 identicalTracks = kTRUE;
1373 while (identicalTracks) {
1374 identicalTracks = kFALSE;
1375 // Loop over first track of the pair
1376 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1377 while (track1 && (!identicalTracks)) {
1378 nHits1 = track1->GetNTrackHits();
1379 // Loop over second track of the pair
1380 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1381 while (track2 && (!identicalTracks)) {
1382 nHits2 = track2->GetNTrackHits();
1383 // number of hits in common between two tracks
1384 hitsInCommon = track1->HitsInCommon(track2);
1385 // check for identical tracks
1386 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1387 identicalTracks = kTRUE;
1388 // decide which track to remove
1389 if (nHits1 > nHits2) trackToRemove = track2;
1390 else if (nHits1 < nHits2) trackToRemove = track1;
1391 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1392 trackToRemove = track2;
1393 else trackToRemove = track1;
1395 trackToRemove->Remove();
1397 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1399 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1405 //__________________________________________________________________________
1406 void AliMUONEventReconstructor::EventDump(void)
1408 // Dump reconstructed event (track parameters at vertex and at first hit),
1409 // and the particle parameters
1411 AliMUONTrack *track;
1412 AliMUONTrackParam *trackParam, *trackParam1;
1414 Double_t bendingSlope, nonBendingSlope, pYZ;
1415 Double_t pX, pY, pZ, x, y, z, c;
1416 Int_t np, trackIndex, nTrackHits;
1418 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1419 if (fPrintLevel >= 1) {
1420 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1422 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1423 // Loop over reconstructed tracks
1424 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1425 if (fPrintLevel >= 1)
1426 cout << " track number: " << trackIndex << endl;
1427 // function for each track for modularity ????
1428 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1429 nTrackHits = track->GetNTrackHits();
1430 if (fPrintLevel >= 1)
1431 cout << " number of track hits: " << nTrackHits << endl;
1432 // track parameters at Vertex
1433 trackParam = track->GetTrackParamAtVertex();
1434 x = trackParam->GetNonBendingCoor();
1435 y = trackParam->GetBendingCoor();
1436 z = trackParam->GetZ();
1437 bendingSlope = trackParam->GetBendingSlope();
1438 nonBendingSlope = trackParam->GetNonBendingSlope();
1439 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1440 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1441 pX = pZ * nonBendingSlope;
1442 pY = pZ * bendingSlope;
1443 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1444 if (fPrintLevel >= 1)
1445 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1446 z, x, y, pX, pY, pZ, c);
1448 // track parameters at first hit
1449 trackParam1 = ((AliMUONTrackHit*)
1450 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1451 x = trackParam1->GetNonBendingCoor();
1452 y = trackParam1->GetBendingCoor();
1453 z = trackParam1->GetZ();
1454 bendingSlope = trackParam1->GetBendingSlope();
1455 nonBendingSlope = trackParam1->GetNonBendingSlope();
1456 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1457 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1458 pX = pZ * nonBendingSlope;
1459 pY = pZ * bendingSlope;
1460 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1461 if (fPrintLevel >= 1)
1462 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1463 z, x, y, pX, pY, pZ, c);
1465 // informations about generated particles
1466 np = gAlice->GetNtrack();
1467 printf(" **** number of generated particles: %d \n", np);
1469 for (Int_t iPart = 0; iPart < np; iPart++) {
1470 p = gAlice->Particle(iPart);
1471 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1472 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1477 void AliMUONEventReconstructor::FillEvent()
1479 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1480 // leaf in the Event branch of TreeRecoEvent tree
1481 cout << "Enter FillEvent() ...\n";
1484 fRecoEvent = new AliMUONRecoEvent();
1486 fRecoEvent->Clear();
1488 //save current directory
1489 TDirectory *current = gDirectory;
1490 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1491 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1492 if (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1493 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1494 TBranch *branch = fEventTree->GetBranch("Event");
1495 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000,1);
1496 branch->SetAutoDelete();
1501 // restore directory