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[u/mrichter/AliRoot.git] / MUON / AliMUONEventReconstructor.cxx
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a9e2aefa 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16/*
17$Log$
0a5f36d9 18Revision 1.22 2001/01/26 20:00:53 hristov
19Major upgrade of AliRoot code
3f5cf0b3 20Revision 1.20 2001/01/08 11:01:02 gosset
21Modifications 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
28*. in track fit:
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
37
d0bfce8d 38Revision 1.19 2000/11/20 11:24:10 gosset
39New package for reconstructed tracks (A. Gheata):
40* tree output in the file "tree_reco.root"
41* display events and make histograms from this file
42
c7ba256d 43Revision 1.18 2000/10/26 12:47:03 gosset
44Real distance between chambers of each station taken into account
45for the reconstruction parameters "fSegmentMaxDistBending[5]"
46
860cef81 47Revision 1.17 2000/10/24 09:26:20 gosset
48Comments updated
49
ba5b68db 50Revision 1.16 2000/10/24 09:22:35 gosset
51Method AddHitsForRecFromRawClusters: real Z of raw cluster and not Z of chamber
52
cfe0107f 53Revision 1.15 2000/10/12 15:17:30 gosset
54Sign of fSimpleBValue corrected: sign ox Bx and not Bz (thanks to Galina)
55
065bd0e1 56Revision 1.14 2000/10/04 18:21:26 morsch
57Include stdlib.h
58
e7d455d5 59Revision 1.13 2000/10/02 21:28:09 fca
60Removal of useless dependecies via forward declarations
61
94de3818 62Revision 1.12 2000/10/02 16:58:29 egangler
63Cleaning of the code :
64-> coding conventions
65-> void Streamers
66-> some useless includes removed or replaced by "class" statement
67
ecfa008b 68Revision 1.11 2000/09/22 09:16:33 hristov
69Casting needed on DEC
70
8832c7b4 71Revision 1.10 2000/09/19 09:49:50 gosset
72AliMUONEventReconstructor package
73* track extrapolation independent from reco_muon.F, use of AliMagF...
74* possibility to use new magnetic field (automatic from generated root file)
75
a6f03ddb 76Revision 1.9 2000/07/20 12:45:27 gosset
77New "EventReconstructor..." structure,
78 hopefully more adapted to tree/streamer.
79"AliMUONEventReconstructor::RemoveDoubleTracks"
80 to keep only one track among similar ones.
81
8429a5e4 82Revision 1.8 2000/07/18 16:04:06 gosset
83AliMUONEventReconstructor package:
84* a few minor modifications and more comments
85* a few corrections
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
93
956019b6 94Revision 1.7 2000/07/03 12:28:06 gosset
95Printout at the right place after extrapolation to vertex
96
6ae236ee 97Revision 1.6 2000/06/30 12:01:06 gosset
98Correction for hit search in the right chamber (JPC)
99
d82671a0 100Revision 1.5 2000/06/30 10:15:48 gosset
101Changes to EventReconstructor...:
102precision fit with multiple Coulomb scattering;
103extrapolation to vertex with Branson correction in absorber (JPC)
104
04b5ea16 105Revision 1.4 2000/06/27 14:11:36 gosset
106Corrections against violations of coding conventions
107
9cbdf048 108Revision 1.3 2000/06/16 07:27:08 gosset
109To remove problem in running RuleChecker, like in MUON-dev
110
79e1e601 111Revision 1.1.2.5 2000/06/16 07:00:26 gosset
112To remove problem in running RuleChecker
113
a9e2aefa 114Revision 1.1.2.4 2000/06/12 08:00:07 morsch
115Dummy streamer to solve CINT compilation problem (to be investigated !)
116
117Revision 1.1.2.3 2000/06/09 20:59:57 morsch
118Make includes consistent with new file structure.
119
120Revision 1.1.2.2 2000/06/09 12:58:05 gosset
121Removed comment beginnings in Log sections of .cxx files
122Suppressed most violations of coding rules
123
124Revision 1.1.2.1 2000/06/07 14:44:53 gosset
125Addition of files for track reconstruction in C++
126*/
127
128//__________________________________________________________________________
129//
130// MUON event reconstructor in ALICE
131//
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
137//
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//__________________________________________________________________________
143
144#include <iostream.h>
e7d455d5 145#include <stdlib.h>
a9e2aefa 146
147#include <TRandom.h>
148#include <TFile.h>
94de3818 149#include <TTree.h>
a9e2aefa 150
a9e2aefa 151#include "AliMUONEventReconstructor.h"
152#include "AliMUON.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"
94de3818 160#include "AliMagF.h"
a9e2aefa 161#include "AliRun.h"
04b5ea16 162#include "TParticle.h"
c7ba256d 163#include "AliMUONRecoEvent.h"
a9e2aefa 164
a9e2aefa 165//************* Defaults parameters for reconstruction
9cbdf048 166static const Double_t kDefaultMinBendingMomentum = 3.0;
d0bfce8d 167static const Double_t kDefaultMaxBendingMomentum = 500.0;
168static const Double_t kDefaultMaxChi2 = 100.0;
9cbdf048 169static const Double_t kDefaultMaxSigma2Distance = 16.0;
170static const Double_t kDefaultBendingResolution = 0.01;
171static const Double_t kDefaultNonBendingResolution = 0.144;
172static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 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 ????
9cbdf048 179static const Double_t kDefaultSimpleBValue = 7.0;
180static const Double_t kDefaultSimpleBLength = 428.0;
181static const Double_t kDefaultSimpleBPosition = 1019.0;
182static const Int_t kDefaultRecGeantHits = 0;
183static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 184
9cbdf048 185static const Int_t kDefaultPrintLevel = 0;
a9e2aefa 186
187ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
188
189 //__________________________________________________________________________
190AliMUONEventReconstructor::AliMUONEventReconstructor(void)
191{
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 ????
9cbdf048 200 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 201 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
202 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
203 }
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 ????
8429a5e4 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 ????
a9e2aefa 212
065bd0e1 213 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
a6f03ddb 214 Float_t b[3], x[3];
215 x[0] = 50.; x[1] = 50.; x[2] = 950.;
216 gAlice->Field()->Field(x, b);
065bd0e1 217 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
a6f03ddb 218 // See how to get fSimple(BValue, BLength, BPosition)
219 // automatically calculated from the actual magnetic field ????
a9e2aefa 220
221 if (fPrintLevel >= 0) {
a6f03ddb 222 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
223 cout << endl << "Magnetic field from root file:" << endl;
224 gAlice->Field()->Dump();
225 cout << endl;
226 }
c7ba256d 227
228 // Initialize to 0 pointers to RecoEvent, tree and tree file
229 fRecoEvent = 0;
230 fEventTree = 0;
231 fTreeFile = 0;
232
a9e2aefa 233 return;
234}
235
9cbdf048 236AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
237{
238 // Dummy copy constructor
239}
240
241AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
242{
243 // Dummy assignment operator
244 return *this;
245}
246
a9e2aefa 247 //__________________________________________________________________________
248AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
249{
250 // Destructor for class AliMUONEventReconstructor
c7ba256d 251 if (fTreeFile) {
252 fTreeFile->Close();
253 delete fTreeFile;
254 }
255// if (fEventTree) delete fEventTree;
256 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 257 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 258 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 259 delete fSegmentsPtr[st]; // Correct destruction of everything ????
260 return;
261}
262
263 //__________________________________________________________________________
264void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
265{
266 // Set reconstruction parameters to default values
267 // Would be much more convenient with a structure (or class) ????
9cbdf048 268 fMinBendingMomentum = kDefaultMinBendingMomentum;
d0bfce8d 269 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
270 fMaxChi2 = kDefaultMaxChi2;
9cbdf048 271 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 272
9cbdf048 273 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 274 // ******** Parameters for making HitsForRec
275 // minimum radius,
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
9cbdf048 279 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
280 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 281 2.0 * TMath::Pi() / 180.0;
282 else fRMin[ch] = 30.0;
d0bfce8d 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;
a9e2aefa 286 }
a9e2aefa 287
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
293 // SIGCUT*DYMAX(IZ)
9cbdf048 294 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 295 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 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;
a9e2aefa 309
9cbdf048 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;
a9e2aefa 319 return;
320}
321
322//__________________________________________________________________________
323Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum)
324{
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.
065bd0e1 328 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 329 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
330 BendingMomentum);
331}
332
333//__________________________________________________________________________
334Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam)
335{
336 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 337 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 338 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
339 // using simple values for dipole magnetic field.
a9e2aefa 340 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
341 ImpactParam);
342}
343
344//__________________________________________________________________________
345void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
346{
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;}
361 }
362 else {
363 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
364 cout << "NOT FOUND: EXIT" << endl;
365 exit(0); // right instruction for exit ????
366 }
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();}
378 }
379 return;
380}
381
382//__________________________________________________________________________
383void AliMUONEventReconstructor::NextBkgGeantEvent(void)
384{
385 // Get next event in background file for GEANT hits
386 // Goes back to event number 0 when end of file is reached
387 char treeName[20];
388 TBranch *branch;
389 if (fPrintLevel >= 0) {
390 cout << "Enter NextBkgGeantEvent" << endl;}
391 // Clean previous event
392 if(fBkgGeantTK) delete fBkgGeantTK;
393 fBkgGeantTK = NULL;
394 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
395 if(fBkgGeantTH) delete fBkgGeantTH;
396 fBkgGeantTH = NULL;
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();}
402 fBkgGeantFile->cd();
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);
407 if (!fBkgGeantTK) {
408 if (fPrintLevel >= 0) {
409 cout << "Cannot find Kine Tree for background event: " <<
410 fBkgGeantEventNumber << endl;
411 cout << "Goes back to event 0" << endl;
412 }
413 fBkgGeantEventNumber = 0;
414 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
415 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
416 if (!fBkgGeantTK) {
417 cout << "ERROR: cannot find Kine Tree for background event: " <<
418 fBkgGeantEventNumber << endl;
419 exit(0);
420 }
421 }
422 if (fBkgGeantTK)
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);
428 if (!fBkgGeantTH) {
429 cout << "ERROR: cannot find Hits Tree for background event: " <<
430 fBkgGeantEventNumber << endl;
431 exit(0);
432 }
433 if (fBkgGeantTH && fBkgGeantHits) {
434 branch = fBkgGeantTH->GetBranch("MUON");
435 if (branch) branch->SetAddress(&fBkgGeantHits);
436 }
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();}
441 return;
442}
443
444//__________________________________________________________________________
445void AliMUONEventReconstructor::EventReconstruct(void)
446{
447 // To reconstruct one event
448 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
449 MakeEventToBeReconstructed();
450 MakeSegments();
451 MakeTracks();
452 return;
453}
454
455 //__________________________________________________________________________
456void AliMUONEventReconstructor::ResetHitsForRec(void)
457{
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();
462 fNHitsForRec = 0;
9cbdf048 463 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 464 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
465 return;
466}
467
468 //__________________________________________________________________________
469void AliMUONEventReconstructor::ResetSegments(void)
470{
471 // To reset the TClonesArray of segments and the number of Segments
472 // for all stations
9cbdf048 473 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 474 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
475 fNSegments[st] = 0;
476 }
477 return;
478}
479
480 //__________________________________________________________________________
481void AliMUONEventReconstructor::ResetTracks(void)
482{
483 // To reset the TClonesArray of reconstructed tracks
8429a5e4 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
a9e2aefa 487 fNRecTracks = 0;
488 return;
489}
490
8429a5e4 491 //__________________________________________________________________________
492void AliMUONEventReconstructor::ResetTrackHits(void)
493{
494 // To reset the TClonesArray of hits on reconstructed tracks
495 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
496 fNRecTrackHits = 0;
497 return;
498}
499
a9e2aefa 500 //__________________________________________________________________________
501void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
502{
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;
507 ResetHitsForRec();
508 if (fRecGeantHits == 1) {
509 // Reconstruction from GEANT hits
510 // Back to the signal file
511 ((gAlice->TreeK())->GetCurrentFile())->cd();
512 // Signal hits
513 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
514 // Security on MUON ????
515 AddHitsForRecFromGEANT(gAlice->TreeH());
516 // Background hits
517 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
518 // Sort HitsForRec in increasing order with respect to chamber number
519 SortHitsForRecWithIncreasingChamber();
520 }
521 else {
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)" ????
9cbdf048 527 TTree *treeR = gAlice->TreeR();
528 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 529 // No sorting: it is done automatically in the previous function
530 }
531 if (fPrintLevel >= 10) {
532 cout << "end of MakeEventToBeReconstructed" << endl;
533 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 534 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 535 cout << "chamber(0...): " << ch
536 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
537 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
538 << endl;
539 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
540 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
541 hit++) {
542 cout << "HitForRec index(0...): " << hit << endl;
543 ((*fHitsForRecPtr)[hit])->Dump();
544 }
545 }
546 }
547 return;
548}
549
550 //__________________________________________________________________________
551void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
552{
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;
9cbdf048 558 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 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++) {
566 gAlice->ResetHits();
567 TH->GetEvent(track);
568 // Loop over hits
569 Int_t hit = 0;
9cbdf048 570 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
a9e2aefa 571 mHit;
9cbdf048 572 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
a9e2aefa 573 NewHitForRecFromGEANT(mHit,track, hit, 1);
574 } // end of hit loop
575 } // end of track loop
576 return;
577}
578
579 //__________________________________________________________________________
580void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
581{
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();
594 TH->GetEvent(track);
595 // Loop over hits
596 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
597 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
598 } // end of hit loop
599 } // end of track loop
600 return;
601}
602
603 //__________________________________________________________________________
604AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
605{
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;
0a5f36d9 620 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
a9e2aefa 621 // only in tracking chambers (fChamber starts at 1)
9cbdf048 622 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 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
94de3818 626 bendCoor = Hit->Y();
627 nonBendCoor = Hit->X();
a9e2aefa 628 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
d0bfce8d 629 // This cut is not needed with a realistic chamber geometry !!!!
630// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
a9e2aefa 631 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
632 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
633 fNHitsForRec++;
634 // add smearing from resolution
635 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
636 hitForRec->SetNonBendingCoor(nonBendCoor
637 + gRandom->Gaus(0., fNonBendingResolution));
d0bfce8d 638// // !!!! without smearing
639// hitForRec->SetBendingCoor(bendCoor);
640// hitForRec->SetNonBendingCoor(nonBendCoor);
a9e2aefa 641 // more information into HitForRec
642 // resolution: angular effect to be added here ????
643 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
644 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
645 // GEANT track info
646 hitForRec->SetHitNumber(HitNumber);
647 hitForRec->SetTHTrack(TrackNumber);
648 hitForRec->SetGeantSignal(Signal);
649 if (fPrintLevel >= 10) {
650 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
651 Hit->Dump();
652 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
653 hitForRec->Dump();}
654 return hitForRec;
655}
656
657 //__________________________________________________________________________
658void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
659{
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();
9cbdf048 665 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 666 fNHitsForRecPerChamber[ch] = 0;
667 fIndexOfFirstHitForRecPerChamber[ch] = 0;
668 }
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
679 if (ch != prevch) {
680 fIndexOfFirstHitForRecPerChamber[ch] = hit;
681 prevch = ch;
682 }
683 }
684 return;
685}
686
687// //__________________________________________________________________________
688// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
689// {
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
9cbdf048 700// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 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();
708// TC->GetEvent();
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);
717// fNHitsForRec++;
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;
728// mCor->Dump();
729// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
730// hitForRec->Dump();}
731// } // end of cluster loop
732// } // end of chamber loop
733// return;
734// }
735
736 //__________________________________________________________________________
737void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
738{
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;
744 Int_t iclus, nclus;
745 TClonesArray *rawclusters;
746 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
9cbdf048 747 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 748 // Security on MUON ????
749 // Loop over tracking chambers
9cbdf048 750 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 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;
9cbdf048 756 rawclusters = pMUON->RawClustAddress(ch);
757 pMUON->ResetRawClusters();
a9e2aefa 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);
766 fNHitsForRec++;
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);
ba5b68db 775 // Z coordinate of the raw cluster (cm)
cfe0107f 776 hitForRec->SetZ(clus->fZ[0]);
a9e2aefa 777 if (fPrintLevel >= 10) {
778 cout << "chamber (0...): " << ch <<
779 " raw cluster (0...): " << iclus << endl;
780 clus->Dump();
781 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
782 hitForRec->Dump();}
783 } // end of cluster loop
784 } // end of chamber loop
785 return;
786}
787
788 //__________________________________________________________________________
789void AliMUONEventReconstructor::MakeSegments(void)
790{
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;
794 ResetSegments();
795 // Loop over stations
9cbdf048 796 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 797 MakeSegmentsPerStation(st);
798 if (fPrintLevel >= 10) {
799 cout << "end of MakeSegments" << endl;
9cbdf048 800 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 801 cout << "station(0...): " << st
802 << " Segments: " << fNSegments[st]
803 << endl;
804 for (Int_t seg = 0;
805 seg < fNSegments[st];
806 seg++) {
807 cout << "Segment index(0...): " << seg << endl;
808 ((*fSegmentsPtr[st])[seg])->Dump();
809 }
810 }
811 }
812 return;
813}
814
815 //__________________________________________________________________________
816void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
817{
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;
825 Bool_t last2st;
826 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
d0bfce8d 827 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 828 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 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;
833 Int_t ch2 = ch1 + 1;
834 // variable true for stations downstream of the dipole:
835 // Station(0..4) equal to 3 or 4
836 if ((Station == 3) || (Station == 4)) {
837 last2st = kTRUE;
838 // maximum impact parameter (cm) according to fMinBendingMomentum...
839 maxImpactParam =
840 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
d0bfce8d 841 // minimum impact parameter (cm) according to fMaxBendingMomentum...
842 minImpactParam =
843 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
a9e2aefa 844 }
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 =
9cbdf048 849 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 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];
855 hit1++) {
856 // pointer to the HitForRec
857 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
858 // extrapolation,
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];
866 hit2++) {
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);
874 if (last2st) {
875 // bending slope
876 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
877 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
878 // absolute value of impact parameter
879 impactParam =
880 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
881 }
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]) &&
d0bfce8d 887 (!last2st || (impactParam < maxImpactParam)) &&
888 (!last2st || (impactParam > minImpactParam))) {
a9e2aefa 889 // make new segment
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
900 << endl;
901 segment->Dump();
902 cout << "HitForRec in first chamber" << endl;
903 hit1Ptr->Dump();
904 cout << "HitForRec in second chamber" << endl;
905 hit2Ptr->Dump();
906 };
907 // increment index for current segment
908 segmentIndex++;
909 }
910 } //for (Int_t hit2
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;
922 return;
923}
924
925 //__________________________________________________________________________
926void AliMUONEventReconstructor::MakeTracks(void)
927{
928 // To make the tracks,
929 // from the list of segments and points in all stations
930 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 931 // The order may be important for the following Reset's
a9e2aefa 932 ResetTracks();
8429a5e4 933 ResetTrackHits();
a9e2aefa 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
937 FollowTracks();
8429a5e4 938 // Remove double tracks
939 RemoveDoubleTracks();
a9e2aefa 940 return;
941}
942
943 //__________________________________________________________________________
944Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
945{
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;
952 Double_t mcsFactor;
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
957 mcsFactor = 0.0136 /
958 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
959 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
960 // linear extrapolation to end station
961 extrapSegment =
962 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
963 // number of candidates with 2 segments to 0
964 nbCan2Seg = 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"
04b5ea16 970 // 4 because 4 quantities in chi2
a9e2aefa 971 if ((endSegment->
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);
985 fNRecTracks++;
986 if (fPrintLevel >= 10) recTrack->RecursiveDump();
987 // increment number of track candidates with 2 segments
988 nbCan2Seg++;
989 }
990 } // for (iEndSegment = 0;...
991 delete extrapSegment; // should not delete HitForRec's it points to !!!!
992 return nbCan2Seg;
993}
994
995 //__________________________________________________________________________
996Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
997{
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;
1004 Double_t mcsFactor;
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;
1015 ch2 = ch1 + 1;
1016 // number of candidates to 0
1017 nbCan1Seg1Hit = 0;
1018 // Loop over chambers of the end station
1019 for (ch = ch2; ch >= ch1; ch--) {
1020 // linear extrapolation to chamber
1021 extrapHitForRec =
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"
04b5ea16 1031 // 2 because 2 quantities in chi2
a9e2aefa 1032 if ((hit->
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 ????
1046 fNRecTracks++;
1047 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1048 // increment number of track candidates
1049 nbCan1Seg1Hit++;
1050 }
1051 } // for (iHit = iHitMin;...
1052 delete extrapHitForRec;
1053 } // for (ch = ch2;...
1054 return nbCan1Seg1Hit;
1055}
1056
1057 //__________________________________________________________________________
1058void AliMUONEventReconstructor::MakeTrackCandidates(void)
1059{
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);
956019b6 1081 // Look for track candidates with one segment and one point,
a9e2aefa 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;...
1089 return;
1090}
1091
1092 //__________________________________________________________________________
1093void AliMUONEventReconstructor::FollowTracks(void)
1094{
1095 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1096 // too long: should be made more modular !!!!
d0bfce8d 1097 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1098 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
04b5ea16 1099 AliMUONTrack *track, *nextTrack;
1100 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1101 // -1 to avoid compilation warnings
1102 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1103 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
d0bfce8d 1104 Double_t bendingMomentum, chi2Norm = 0.;
9cbdf048 1105 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1106 // local maxSigma2Distance, for easy increase in testing
1107 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1108 if (fPrintLevel >= 2)
1109 cout << "enter FollowTracks" << endl;
1110 // Loop over track candidates
04b5ea16 1111 track = (AliMUONTrack*) fRecTracksPtr->First();
1112 trackIndex = -1;
1113 while (track) {
1114 // Follow function for each track candidate ????
1115 trackIndex++;
1116 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1117 if (fPrintLevel >= 2)
1118 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 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
1123 track->Fit();
a9e2aefa 1124 if (fPrintLevel >= 10) {
1125 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1126 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1127 track->RecursiveDump();
1128 }
1129 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1130 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1131 // otherwise: majority coincidence 2 !!!!
a9e2aefa 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);
79e1e601 1138 extrapSegment = new AliMUONSegment(); // empty segment
d0bfce8d 1139 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
a9e2aefa 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
9cbdf048 1145 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1146 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1147 // Z difference between the two previous stations
9cbdf048 1148 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1149 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 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);
1154 extrapSegment->
1155 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1156 extrapSegment->UpdateFromStationTrackParam
1157 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1158 trackParam1->GetInverseBendingMomentum());
d0bfce8d 1159 // same thing for corrected segment
1160 // better to use copy constructor, after checking that it works properly !!!!
1161 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1162 extrapCorrSegment->
1163 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1164 extrapCorrSegment->UpdateFromStationTrackParam
1165 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1166 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1167 bestChi2 = 5.0;
1168 bestSegment = NULL;
1169 if (fPrintLevel >= 10) {
1170 cout << "FollowTracks: track candidate(0..): " << trackIndex
1171 << " Look for segment in station(0..): " << station << endl;
1172 }
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]);
d0bfce8d 1180 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1181 // according to real Z value of "segment" and slopes of "extrapSegment"
1182 extrapCorrSegment->
1183 SetBendingCoor(extrapSegment->GetBendingCoor() +
1184 extrapSegment->GetBendingSlope() *
1185 (segment->GetHitForRec1()->GetZ() -
1186 (&(pMUON->Chamber(2 * station)))->Z()));
1187 extrapCorrSegment->
1188 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1189 extrapSegment->GetNonBendingSlope() *
1190 (segment->GetHitForRec1()->GetZ() -
1191 (&(pMUON->Chamber(2 * station)))->Z()));
1192 chi2 = segment->
1193 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
a9e2aefa 1194 if (chi2 < bestChi2) {
1195 // update best Chi2 and Segment if better found
1196 bestSegment = segment;
1197 bestChi2 = chi2;
1198 }
1199 }
1200 if (bestSegment) {
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();
1210 }
1211 }
1212 else {
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 !!!!
79e1e601 1217 extrapHit = new AliMUONHitForRec(); // empty hit
d0bfce8d 1218 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
a9e2aefa 1219 bestChi2 = 3.0;
1220 bestHit = NULL;
1221 if (fPrintLevel >= 10) {
1222 cout << "FollowTracks: track candidate(0..): " << trackIndex
1223 << " Segment not found, look for hit in station(0..): " << station
1224 << endl;
1225 }
1226 // Loop over chambers of the station
d82671a0 1227 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1228 // coordinates of extrapolated hit
d82671a0 1229 extrapHit->
1230 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1231 extrapHit->
1232 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1233 // resolutions from "extrapSegment"
1234 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1235 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
d0bfce8d 1236 // same things for corrected hit
1237 // better to use copy constructor, after checking that it works properly !!!!
1238 extrapCorrHit->
1239 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1240 extrapCorrHit->
1241 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1242 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1243 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
a9e2aefa 1244 // Loop over hits in the chamber
956019b6 1245 ch = 2 * station + chInStation;
a9e2aefa 1246 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1247 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1248 fNHitsForRecPerChamber[ch];
1249 iHit++) {
1250 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
d0bfce8d 1251 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1252 // according to real Z value of "hit" and slopes of right "trackParam"
1253 extrapCorrHit->
1254 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1255 (&(trackParam[chInStation]))->GetBendingSlope() *
1256 (hit->GetZ() -
1257 (&(trackParam[chInStation]))->GetZ()));
1258 extrapCorrHit->
1259 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1260 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1261 (hit->GetZ() -
1262 (&(trackParam[chInStation]))->GetZ()));
a9e2aefa 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
1267 bestHit = hit;
1268 bestChi2 = chi2;
d82671a0 1269 chBestHit = chInStation;
a9e2aefa 1270 }
1271 }
1272 }
1273 if (bestHit) {
1274 // best hit found: add it to track candidate
1275 track->AddHitForRec(bestHit);
956019b6 1276 // set track parameters at this TrackHit
a9e2aefa 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();
1283 }
1284 }
1285 else {
8429a5e4 1286 // Remove current track candidate
1287 // and corresponding TrackHit's, ...
1288 track->Remove();
04b5ea16 1289 delete extrapSegment;
d0bfce8d 1290 delete extrapCorrSegment;
1291 delete extrapHit;
1292 delete extrapCorrHit;
a9e2aefa 1293 break; // stop the search for this candidate:
1294 // exit from the loop over station
1295 }
d0bfce8d 1296 delete extrapHit;
1297 delete extrapCorrHit;
a9e2aefa 1298 }
04b5ea16 1299 delete extrapSegment;
d0bfce8d 1300 delete extrapCorrSegment;
a9e2aefa 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();
d0bfce8d 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)) {
1311 track->Remove();
1312 break; // stop the search for this candidate:
1313 // exit from the loop over station
1314 }
956019b6 1315 // Track fit
04b5ea16 1316 // with multiple Coulomb scattering if all stations
1317 if (station == 0) track->SetFitMCS(1);
956019b6 1318 // without multiple Coulomb scattering if not all stations
04b5ea16 1319 else track->SetFitMCS(0);
956019b6 1320 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1321 track->SetFitStart(1); // from parameters at first hit
1322 track->Fit();
d0bfce8d 1323 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1324 if (numberOfDegFree > 0) {
1325 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1326 } else {
1327 chi2Norm = 1.e10;
1328 }
1329 // Track removed if normalized chi2 too high
1330 if (chi2Norm > fMaxChi2) {
1331 track->Remove();
1332 break; // stop the search for this candidate:
1333 // exit from the loop over station
1334 }
a9e2aefa 1335 if (fPrintLevel >= 10) {
1336 cout << "FollowTracks: track candidate(0..): " << trackIndex
1337 << " after fit from station(0..): " << station << " to 4" << endl;
1338 track->RecursiveDump();
1339 }
04b5ea16 1340 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1341 // after going through the first station
04b5ea16 1342 if (station == 0) {
1343 trackParamVertex = *trackParam1;
1344 (&trackParamVertex)->ExtrapToVertex();
1345 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1346 if (fPrintLevel >= 1) {
1347 cout << "FollowTracks: track candidate(0..): " << trackIndex
1348 << " after extrapolation to vertex" << endl;
1349 track->RecursiveDump();
1350 }
04b5ea16 1351 }
a9e2aefa 1352 } // for (station = 2;...
04b5ea16 1353 // go really to next track
1354 track = nextTrack;
1355 } // while (track)
1356 // Compression of track array (necessary after Remove ????)
1357 fRecTracksPtr->Compress();
1358 return;
1359}
1360
1361 //__________________________________________________________________________
8429a5e4 1362void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1363{
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;
1394 // remove it
1395 trackToRemove->Remove();
1396 }
1397 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1398 } // track2
1399 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1400 } // track1
1401 }
1402 return;
1403}
1404
1405 //__________________________________________________________________________
04b5ea16 1406void AliMUONEventReconstructor::EventDump(void)
1407{
1408 // Dump reconstructed event (track parameters at vertex and at first hit),
1409 // and the particle parameters
1410
1411 AliMUONTrack *track;
1412 AliMUONTrackParam *trackParam, *trackParam1;
04b5ea16 1413 TParticle *p;
1414 Double_t bendingSlope, nonBendingSlope, pYZ;
1415 Double_t pX, pY, pZ, x, y, z, c;
1416 Int_t np, trackIndex, nTrackHits;
1417
1418 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1419 if (fPrintLevel >= 1) {
1420 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1421 }
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);
1447
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);
1464 }
1465 // informations about generated particles
2ab0c725 1466 np = gAlice->GetNtrack();
04b5ea16 1467 printf(" **** number of generated particles: %d \n", np);
1468
1469 for (Int_t iPart = 0; iPart < np; iPart++) {
2ab0c725 1470 p = gAlice->Particle(iPart);
04b5ea16 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());
1473 }
a9e2aefa 1474 return;
1475}
1476
c7ba256d 1477void AliMUONEventReconstructor::FillEvent()
1478{
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";
1482
1483 if (!fRecoEvent) {
1484 fRecoEvent = new AliMUONRecoEvent();
1485 } else {
1486 fRecoEvent->Clear();
1487 }
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();
1497 fTreeFile->cd();
1498 fEventTree->Fill();
1499 fTreeFile->Write();
1500 }
1501 // restore directory
1502 current->cd();
1503}