]> git.uio.no Git - u/mrichter/AliRoot.git/blame - MUON/AliMUONEventReconstructor.cxx
git://git.uio.no / u / mrichter / AliRoot.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
stdlib.h included to define exit()
[u/mrichter/AliRoot.git] / MUON / AliMUONEventReconstructor.cxx
CommitLineData
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$Log$
82a4bc7b 18Revision 1.25 2001/04/25 14:50:42 gosset
19Corrections to violations of coding conventions
20
3831f268 21Revision 1.24 2001/03/30 09:37:58 gosset
22Initialisations of pointers... for GEANT background events in the constructor
23
47a6b602 24Revision 1.23 2001/01/26 21:44:45 morsch
25Use access functions to AliMUONDigit, ... member data.
26
0a5f36d9 27Revision 1.22 2001/01/26 20:00:53 hristov
28Major upgrade of AliRoot code
3f5cf0b3 29Revision 1.20 2001/01/08 11:01:02 gosset
30Modifications used for addendum to Dimuon TDR (JP Cussonneau):
31*. MaxBendingMomentum to make both a segment and a track (default 500)
32*. MaxChi2 per degree of freedom to make a track (default 100)
33*. MinBendingMomentum used also to make a track
34 and not only a segment (default 3)
35*. wider roads for track search in stations 1 to 3
36*. extrapolation to actual Z instead of Z(chamber) in FollowTracks
37*. in track fit:
38 - limits on parameters X and Y (+/-500)
39 - covariance matrices in double precision
40 - normalization of covariance matrices before inversion
41 - suppression of Minuit printouts
42*. correction against memory leak (delete extrapHit) in FollowTracks
43*. RMax to 10 degrees with Z(chamber) instead of fixed values;
44 RMin and Rmax cuts suppressed in NewHitForRecFromGEANT,
45 because useless with realistic geometry
46
d0bfce8d 47Revision 1.19 2000/11/20 11:24:10 gosset
48New package for reconstructed tracks (A. Gheata):
49* tree output in the file "tree_reco.root"
50* display events and make histograms from this file
51
c7ba256d 52Revision 1.18 2000/10/26 12:47:03 gosset
53Real distance between chambers of each station taken into account
54for the reconstruction parameters "fSegmentMaxDistBending[5]"
55
860cef81 56Revision 1.17 2000/10/24 09:26:20 gosset
57Comments updated
58
ba5b68db 59Revision 1.16 2000/10/24 09:22:35 gosset
60Method AddHitsForRecFromRawClusters: real Z of raw cluster and not Z of chamber
61
cfe0107f 62Revision 1.15 2000/10/12 15:17:30 gosset
63Sign of fSimpleBValue corrected: sign ox Bx and not Bz (thanks to Galina)
64
065bd0e1 65Revision 1.14 2000/10/04 18:21:26 morsch
66Include stdlib.h
67
e7d455d5 68Revision 1.13 2000/10/02 21:28:09 fca
69Removal of useless dependecies via forward declarations
70
94de3818 71Revision 1.12 2000/10/02 16:58:29 egangler
72Cleaning of the code :
73-> coding conventions
74-> void Streamers
75-> some useless includes removed or replaced by "class" statement
76
ecfa008b 77Revision 1.11 2000/09/22 09:16:33 hristov
78Casting needed on DEC
79
8832c7b4 80Revision 1.10 2000/09/19 09:49:50 gosset
81AliMUONEventReconstructor package
82* track extrapolation independent from reco_muon.F, use of AliMagF...
83* possibility to use new magnetic field (automatic from generated root file)
84
a6f03ddb 85Revision 1.9 2000/07/20 12:45:27 gosset
86New "EventReconstructor..." structure,
87 hopefully more adapted to tree/streamer.
88"AliMUONEventReconstructor::RemoveDoubleTracks"
89 to keep only one track among similar ones.
90
8429a5e4 91Revision 1.8 2000/07/18 16:04:06 gosset
92AliMUONEventReconstructor package:
93* a few minor modifications and more comments
94* a few corrections
95 * right sign for Z of raw clusters
96 * right loop over chambers inside station
97 * symmetrized covariance matrix for measurements (TrackChi2MCS)
98 * right sign of charge in extrapolation (ExtrapToZ)
99 * right zEndAbsorber for Branson correction below 3 degrees
100* use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
101* no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
102
956019b6 103Revision 1.7 2000/07/03 12:28:06 gosset
104Printout at the right place after extrapolation to vertex
105
6ae236ee 106Revision 1.6 2000/06/30 12:01:06 gosset
107Correction for hit search in the right chamber (JPC)
108
d82671a0 109Revision 1.5 2000/06/30 10:15:48 gosset
110Changes to EventReconstructor...:
111precision fit with multiple Coulomb scattering;
112extrapolation to vertex with Branson correction in absorber (JPC)
113
04b5ea16 114Revision 1.4 2000/06/27 14:11:36 gosset
115Corrections against violations of coding conventions
116
9cbdf048 117Revision 1.3 2000/06/16 07:27:08 gosset
118To remove problem in running RuleChecker, like in MUON-dev
119
79e1e601 120Revision 1.1.2.5 2000/06/16 07:00:26 gosset
121To remove problem in running RuleChecker
122
a9e2aefa 123Revision 1.1.2.4 2000/06/12 08:00:07 morsch
124Dummy streamer to solve CINT compilation problem (to be investigated !)
125
126Revision 1.1.2.3 2000/06/09 20:59:57 morsch
127Make includes consistent with new file structure.
128
129Revision 1.1.2.2 2000/06/09 12:58:05 gosset
130Removed comment beginnings in Log sections of .cxx files
131Suppressed most violations of coding rules
132
133Revision 1.1.2.1 2000/06/07 14:44:53 gosset
134Addition of files for track reconstruction in C++
135*/
136
3831f268 137////////////////////////////////////
a9e2aefa 138//
139// MUON event reconstructor in ALICE
140//
141// This class contains as data:
142// * the parameters for the event reconstruction
143// * a pointer to the array of hits to be reconstructed (the event)
144// * a pointer to the array of segments made with these hits inside each station
145// * a pointer to the array of reconstructed tracks
146//
147// It contains as methods, among others:
148// * MakeEventToBeReconstructed to build the array of hits to be reconstructed
149// * MakeSegments to build the segments
150// * MakeTracks to build the tracks
3831f268 151//
152////////////////////////////////////
a9e2aefa 153
3831f268 154#include <iostream.h> // for cout
82a4bc7b 155#include <stdlib.h> // for exit()
a9e2aefa 156
94de3818 157#include <TTree.h>
a9e2aefa 158
a9e2aefa 159#include "AliMUON.h"
3831f268 160#include "AliMUONChamber.h"
161#include "AliMUONEventReconstructor.h"
a9e2aefa 162#include "AliMUONHitForRec.h"
a9e2aefa 163#include "AliMUONRawCluster.h"
3831f268 164#include "AliMUONRecoEvent.h"
165#include "AliMUONSegment.h"
a9e2aefa 166#include "AliMUONTrack.h"
a9e2aefa 167#include "AliMUONTrackHit.h"
94de3818 168#include "AliMagF.h"
3831f268 169#include "AliRun.h" // for gAlice
a9e2aefa 170
a9e2aefa 171//************* Defaults parameters for reconstruction
9cbdf048 172static const Double_t kDefaultMinBendingMomentum = 3.0;
d0bfce8d 173static const Double_t kDefaultMaxBendingMomentum = 500.0;
174static const Double_t kDefaultMaxChi2 = 100.0;
9cbdf048 175static const Double_t kDefaultMaxSigma2Distance = 16.0;
176static const Double_t kDefaultBendingResolution = 0.01;
177static const Double_t kDefaultNonBendingResolution = 0.144;
178static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 179// Simple magnetic field:
180// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
181// Length and Position from reco_muon.F, with opposite sign:
182// Length = ZMAGEND-ZCOIL
183// Position = (ZMAGEND+ZCOIL)/2
184// to be ajusted differently from real magnetic field ????
9cbdf048 185static const Double_t kDefaultSimpleBValue = 7.0;
186static const Double_t kDefaultSimpleBLength = 428.0;
187static const Double_t kDefaultSimpleBPosition = 1019.0;
188static const Int_t kDefaultRecGeantHits = 0;
189static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 190
9cbdf048 191static const Int_t kDefaultPrintLevel = 0;
a9e2aefa 192
193ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
194
195 //__________________________________________________________________________
196AliMUONEventReconstructor::AliMUONEventReconstructor(void)
197{
198 // Constructor for class AliMUONEventReconstructor
199 SetReconstructionParametersToDefaults();
200 // Memory allocation for the TClonesArray of hits for reconstruction
201 // Is 10000 the right size ????
202 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
203 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
204 // Memory allocation for the TClonesArray's of segments in stations
205 // Is 2000 the right size ????
9cbdf048 206 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 207 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
208 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
209 }
210 // Memory allocation for the TClonesArray of reconstructed tracks
211 // Is 10 the right size ????
212 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
213 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
8429a5e4 214 // Memory allocation for the TClonesArray of hits on reconstructed tracks
215 // Is 100 the right size ????
216 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
217 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
a9e2aefa 218
065bd0e1 219 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
a6f03ddb 220 Float_t b[3], x[3];
221 x[0] = 50.; x[1] = 50.; x[2] = 950.;
222 gAlice->Field()->Field(x, b);
065bd0e1 223 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
a6f03ddb 224 // See how to get fSimple(BValue, BLength, BPosition)
225 // automatically calculated from the actual magnetic field ????
a9e2aefa 226
227 if (fPrintLevel >= 0) {
a6f03ddb 228 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
229 cout << endl << "Magnetic field from root file:" << endl;
230 gAlice->Field()->Dump();
231 cout << endl;
232 }
c7ba256d 233
47a6b602 234 // Initializions for GEANT background events
235 fBkgGeantFile = 0;
236 fBkgGeantTK = 0;
237 fBkgGeantParticles = 0;
238 fBkgGeantTH = 0;
239 fBkgGeantHits = 0;
240 fBkgGeantEventNumber = -1;
241
c7ba256d 242 // Initialize to 0 pointers to RecoEvent, tree and tree file
243 fRecoEvent = 0;
244 fEventTree = 0;
245 fTreeFile = 0;
246
a9e2aefa 247 return;
248}
249
9cbdf048 250AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
251{
252 // Dummy copy constructor
253}
254
255AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
256{
257 // Dummy assignment operator
258 return *this;
259}
260
a9e2aefa 261 //__________________________________________________________________________
262AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
263{
264 // Destructor for class AliMUONEventReconstructor
c7ba256d 265 if (fTreeFile) {
266 fTreeFile->Close();
267 delete fTreeFile;
268 }
269// if (fEventTree) delete fEventTree;
270 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 271 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 272 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 273 delete fSegmentsPtr[st]; // Correct destruction of everything ????
274 return;
275}
276
277 //__________________________________________________________________________
278void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
279{
280 // Set reconstruction parameters to default values
281 // Would be much more convenient with a structure (or class) ????
9cbdf048 282 fMinBendingMomentum = kDefaultMinBendingMomentum;
d0bfce8d 283 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
284 fMaxChi2 = kDefaultMaxChi2;
9cbdf048 285 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 286
9cbdf048 287 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 288 // ******** Parameters for making HitsForRec
289 // minimum radius,
290 // like in TRACKF_STAT:
291 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
292 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
9cbdf048 293 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
294 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 295 2.0 * TMath::Pi() / 180.0;
296 else fRMin[ch] = 30.0;
d0bfce8d 297 // maximum radius at 10 degrees and Z of chamber
298 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
299 10.0 * TMath::Pi() / 180.0;
a9e2aefa 300 }
a9e2aefa 301
302 // ******** Parameters for making segments
303 // should be parametrized ????
304 // according to interval between chambers in a station ????
305 // Maximum distance in non bending plane
306 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
307 // SIGCUT*DYMAX(IZ)
9cbdf048 308 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 309 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 310 // Maximum distance in bending plane:
311 // values from TRACKF_STAT, corresponding to (J psi 20cm),
312 // scaled to the real distance between chambers in a station
313 fSegmentMaxDistBending[0] = 1.5 *
314 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
315 fSegmentMaxDistBending[1] = 1.5 *
316 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
317 fSegmentMaxDistBending[2] = 3.0 *
318 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
319 fSegmentMaxDistBending[3] = 6.0 *
320 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
321 fSegmentMaxDistBending[4] = 6.0 *
322 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
a9e2aefa 323
9cbdf048 324 fBendingResolution = kDefaultBendingResolution;
325 fNonBendingResolution = kDefaultNonBendingResolution;
326 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
327 fSimpleBValue = kDefaultSimpleBValue;
328 fSimpleBLength = kDefaultSimpleBLength;
329 fSimpleBPosition = kDefaultSimpleBPosition;
330 fRecGeantHits = kDefaultRecGeantHits;
331 fEfficiency = kDefaultEfficiency;
332 fPrintLevel = kDefaultPrintLevel;
a9e2aefa 333 return;
334}
335
336//__________________________________________________________________________
3831f268 337Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
a9e2aefa 338{
339 // Returns impact parameter at vertex in bending plane (cm),
340 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
341 // using simple values for dipole magnetic field.
065bd0e1 342 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 343 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
344 BendingMomentum);
345}
346
347//__________________________________________________________________________
3831f268 348Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
a9e2aefa 349{
350 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 351 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 352 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
353 // using simple values for dipole magnetic field.
a9e2aefa 354 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
355 ImpactParam);
356}
357
358//__________________________________________________________________________
359void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
360{
361 // Set background file ... for GEANT hits
362 // Must be called after having loaded the firts signal event
363 if (fPrintLevel >= 0) {
364 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
365 << BkgGeantFileName << "''" << endl;}
366 if (strlen(BkgGeantFileName)) {
367 // BkgGeantFileName not empty: try to open the file
368 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
369 fBkgGeantFile = new TFile(BkgGeantFileName);
370 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
371 if (fBkgGeantFile-> IsOpen()) {
372 if (fPrintLevel >= 0) {
373 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
374 << "'' successfully opened" << endl;}
375 }
376 else {
377 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
378 cout << "NOT FOUND: EXIT" << endl;
379 exit(0); // right instruction for exit ????
380 }
381 // Arrays for "particles" and "hits"
382 fBkgGeantParticles = new TClonesArray("TParticle", 200);
383 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
384 // Event number to -1 for initialization
385 fBkgGeantEventNumber = -1;
386 // Back to the signal file:
387 // first signal event must have been loaded previously,
388 // otherwise, Segmentation violation at the next instruction
389 // How is it possible to do smething better ????
390 ((gAlice->TreeK())->GetCurrentFile())->cd();
391 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
392 }
393 return;
394}
395
396//__________________________________________________________________________
397void AliMUONEventReconstructor::NextBkgGeantEvent(void)
398{
399 // Get next event in background file for GEANT hits
400 // Goes back to event number 0 when end of file is reached
401 char treeName[20];
402 TBranch *branch;
403 if (fPrintLevel >= 0) {
404 cout << "Enter NextBkgGeantEvent" << endl;}
405 // Clean previous event
406 if(fBkgGeantTK) delete fBkgGeantTK;
407 fBkgGeantTK = NULL;
408 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
409 if(fBkgGeantTH) delete fBkgGeantTH;
410 fBkgGeantTH = NULL;
411 if(fBkgGeantHits) fBkgGeantHits->Clear();
412 // Increment event number
413 fBkgGeantEventNumber++;
414 // Get access to Particles and Hits for event from background file
415 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
416 fBkgGeantFile->cd();
417 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
418 // Particles: TreeK for event and branch "Particles"
419 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
420 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
421 if (!fBkgGeantTK) {
422 if (fPrintLevel >= 0) {
423 cout << "Cannot find Kine Tree for background event: " <<
424 fBkgGeantEventNumber << endl;
425 cout << "Goes back to event 0" << endl;
426 }
427 fBkgGeantEventNumber = 0;
428 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
429 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
430 if (!fBkgGeantTK) {
431 cout << "ERROR: cannot find Kine Tree for background event: " <<
432 fBkgGeantEventNumber << endl;
433 exit(0);
434 }
435 }
436 if (fBkgGeantTK)
437 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
438 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
439 // Hits: TreeH for event and branch "MUON"
440 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
441 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
442 if (!fBkgGeantTH) {
443 cout << "ERROR: cannot find Hits Tree for background event: " <<
444 fBkgGeantEventNumber << endl;
445 exit(0);
446 }
447 if (fBkgGeantTH && fBkgGeantHits) {
448 branch = fBkgGeantTH->GetBranch("MUON");
449 if (branch) branch->SetAddress(&fBkgGeantHits);
450 }
451 fBkgGeantTH->GetEntries(); // necessary ????
452 // Back to the signal file
453 ((gAlice->TreeK())->GetCurrentFile())->cd();
454 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
455 return;
456}
457
458//__________________________________________________________________________
459void AliMUONEventReconstructor::EventReconstruct(void)
460{
461 // To reconstruct one event
462 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
463 MakeEventToBeReconstructed();
464 MakeSegments();
465 MakeTracks();
466 return;
467}
468
469 //__________________________________________________________________________
470void AliMUONEventReconstructor::ResetHitsForRec(void)
471{
472 // To reset the array and the number of HitsForRec,
473 // and also the number of HitsForRec
474 // and the index of the first HitForRec per chamber
475 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
476 fNHitsForRec = 0;
9cbdf048 477 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 478 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
479 return;
480}
481
482 //__________________________________________________________________________
483void AliMUONEventReconstructor::ResetSegments(void)
484{
485 // To reset the TClonesArray of segments and the number of Segments
486 // for all stations
9cbdf048 487 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 488 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
489 fNSegments[st] = 0;
490 }
491 return;
492}
493
494 //__________________________________________________________________________
495void AliMUONEventReconstructor::ResetTracks(void)
496{
497 // To reset the TClonesArray of reconstructed tracks
8429a5e4 498 if (fRecTracksPtr) fRecTracksPtr->Delete();
499 // Delete in order that the Track destructors are called,
500 // hence the space for the TClonesArray of pointers to TrackHit's is freed
a9e2aefa 501 fNRecTracks = 0;
502 return;
503}
504
8429a5e4 505 //__________________________________________________________________________
506void AliMUONEventReconstructor::ResetTrackHits(void)
507{
508 // To reset the TClonesArray of hits on reconstructed tracks
509 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
510 fNRecTrackHits = 0;
511 return;
512}
513
a9e2aefa 514 //__________________________________________________________________________
515void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
516{
517 // To make the list of hits to be reconstructed,
518 // either from the GEANT hits or from the raw clusters
519 // according to the parameter set for the reconstructor
520 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
521 ResetHitsForRec();
522 if (fRecGeantHits == 1) {
523 // Reconstruction from GEANT hits
524 // Back to the signal file
525 ((gAlice->TreeK())->GetCurrentFile())->cd();
526 // Signal hits
527 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
528 // Security on MUON ????
529 AddHitsForRecFromGEANT(gAlice->TreeH());
530 // Background hits
531 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
532 // Sort HitsForRec in increasing order with respect to chamber number
533 SortHitsForRecWithIncreasingChamber();
534 }
535 else {
536 // Reconstruction from raw clusters
537 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
538 // Security on MUON ????
539 // TreeR assumed to be be "prepared" in calling function
540 // by "MUON->GetTreeR(nev)" ????
9cbdf048 541 TTree *treeR = gAlice->TreeR();
542 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 543 // No sorting: it is done automatically in the previous function
544 }
545 if (fPrintLevel >= 10) {
546 cout << "end of MakeEventToBeReconstructed" << endl;
547 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 548 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 549 cout << "chamber(0...): " << ch
550 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
551 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
552 << endl;
553 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
554 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
555 hit++) {
556 cout << "HitForRec index(0...): " << hit << endl;
557 ((*fHitsForRecPtr)[hit])->Dump();
558 }
559 }
560 }
561 return;
562}
563
564 //__________________________________________________________________________
565void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
566{
567 // To add to the list of hits for reconstruction
568 // the GEANT signal hits from a hit tree TH.
569 if (fPrintLevel >= 2)
570 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
571 if (TH == NULL) return;
9cbdf048 572 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 573 // Security on MUON ????
574 // See whether it could be the same for signal and background ????
575 // Loop over tracks in tree
576 Int_t ntracks = (Int_t) TH->GetEntries();
577 if (fPrintLevel >= 2)
578 cout << "ntracks: " << ntracks << endl;
579 for (Int_t track = 0; track < ntracks; track++) {
580 gAlice->ResetHits();
581 TH->GetEvent(track);
582 // Loop over hits
583 Int_t hit = 0;
9cbdf048 584 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
a9e2aefa 585 mHit;
9cbdf048 586 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
a9e2aefa 587 NewHitForRecFromGEANT(mHit,track, hit, 1);
588 } // end of hit loop
589 } // end of track loop
590 return;
591}
592
593 //__________________________________________________________________________
594void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
595{
596 // To add to the list of hits for reconstruction
597 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
598 // How to have only one function "AddHitsForRecFromGEANT" ????
599 if (fPrintLevel >= 2)
600 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
601 if (TH == NULL) return;
602 // Loop over tracks in tree
603 Int_t ntracks = (Int_t) TH->GetEntries();
604 if (fPrintLevel >= 2)
605 cout << "ntracks: " << ntracks << endl;
606 for (Int_t track = 0; track < ntracks; track++) {
607 if (Hits) Hits->Clear();
608 TH->GetEvent(track);
609 // Loop over hits
610 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
611 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
612 } // end of hit loop
613 } // end of track loop
614 return;
615}
616
617 //__________________________________________________________________________
618AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
619{
620 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
621 // with hit number "HitNumber" in the track numbered "TrackNumber",
622 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
623 // Selects hits in tracking (not trigger) chambers.
624 // Takes into account the efficiency (fEfficiency)
625 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
626 // Adds a condition on the radius between RMin and RMax
627 // to better simulate the real chambers.
628 // Returns the pointer to the new hit for reconstruction,
629 // or NULL in case of inefficiency or non tracking chamber or bad radius.
630 // No condition on at most 20 cm from a muon from a resonance
631 // like in Fortran TRACKF_STAT.
632 AliMUONHitForRec* hitForRec;
633 Double_t bendCoor, nonBendCoor, radius;
0a5f36d9 634 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
a9e2aefa 635 // only in tracking chambers (fChamber starts at 1)
9cbdf048 636 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 637 // only if hit is efficient (keep track for checking ????)
638 if (gRandom->Rndm() > fEfficiency) return NULL;
639 // only if radius between RMin and RMax
94de3818 640 bendCoor = Hit->Y();
641 nonBendCoor = Hit->X();
a9e2aefa 642 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
d0bfce8d 643 // This cut is not needed with a realistic chamber geometry !!!!
644// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
a9e2aefa 645 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
646 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
647 fNHitsForRec++;
648 // add smearing from resolution
649 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
650 hitForRec->SetNonBendingCoor(nonBendCoor
651 + gRandom->Gaus(0., fNonBendingResolution));
d0bfce8d 652// // !!!! without smearing
653// hitForRec->SetBendingCoor(bendCoor);
654// hitForRec->SetNonBendingCoor(nonBendCoor);
a9e2aefa 655 // more information into HitForRec
656 // resolution: angular effect to be added here ????
657 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
658 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
659 // GEANT track info
660 hitForRec->SetHitNumber(HitNumber);
661 hitForRec->SetTHTrack(TrackNumber);
662 hitForRec->SetGeantSignal(Signal);
663 if (fPrintLevel >= 10) {
664 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
665 Hit->Dump();
666 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
667 hitForRec->Dump();}
668 return hitForRec;
669}
670
671 //__________________________________________________________________________
672void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
673{
674 // Sort HitsForRec's in increasing order with respect to chamber number.
675 // Uses the function "Compare".
676 // Update the information for HitsForRec per chamber too.
677 Int_t ch, nhits, prevch;
678 fHitsForRecPtr->Sort();
9cbdf048 679 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 680 fNHitsForRecPerChamber[ch] = 0;
681 fIndexOfFirstHitForRecPerChamber[ch] = 0;
682 }
683 prevch = 0; // previous chamber
684 nhits = 0; // number of hits in current chamber
685 // Loop over HitsForRec
686 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
687 // chamber number (0...)
688 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
689 // increment number of hits in current chamber
690 (fNHitsForRecPerChamber[ch])++;
691 // update index of first HitForRec in current chamber
692 // if chamber number different from previous one
693 if (ch != prevch) {
694 fIndexOfFirstHitForRecPerChamber[ch] = hit;
695 prevch = ch;
696 }
697 }
698 return;
699}
700
701// //__________________________________________________________________________
702// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
703// {
704// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
705// // To add to the list of hits for reconstruction
706// // the (cathode correlated) raw clusters
707// // No condition added, like in Fortran TRACKF_STAT,
708// // on the radius between RMin and RMax.
709// AliMUONHitForRec *hitForRec;
710// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
711// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
712// // Security on MUON ????
713// // Loop over tracking chambers
9cbdf048 714// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 715// // number of HitsForRec to 0 for the chamber
716// fNHitsForRecPerChamber[ch] = 0;
717// // index of first HitForRec for the chamber
718// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
719// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
720// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
721// MUON->ResetReconstHits();
722// TC->GetEvent();
723// Int_t ncor = (Int_t)reconst_hits->GetEntries();
724// // Loop over (cathode correlated) raw clusters
725// for (Int_t cor = 0; cor < ncor; cor++) {
726// AliMUONReconstHit * mCor =
727// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
728// // new AliMUONHitForRec from (cathode correlated) raw cluster
729// // and increment number of AliMUONHitForRec's (total and in chamber)
730// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
731// fNHitsForRec++;
732// (fNHitsForRecPerChamber[ch])++;
733// // more information into HitForRec
734// hitForRec->SetChamberNumber(ch);
735// hitForRec->SetHitNumber(cor);
736// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
737// // could (should) be more exact from chamber geometry ????
738// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
739// if (fPrintLevel >= 10) {
740// cout << "chamber (0...): " << ch <<
741// " cathcorrel (0...): " << cor << endl;
742// mCor->Dump();
743// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
744// hitForRec->Dump();}
745// } // end of cluster loop
746// } // end of chamber loop
747// return;
748// }
749
750 //__________________________________________________________________________
751void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
752{
753 // To add to the list of hits for reconstruction all the raw clusters
754 // No condition added, like in Fortran TRACKF_STAT,
755 // on the radius between RMin and RMax.
756 AliMUONHitForRec *hitForRec;
757 AliMUONRawCluster *clus;
758 Int_t iclus, nclus;
759 TClonesArray *rawclusters;
760 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
9cbdf048 761 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 762 // Security on MUON ????
763 // Loop over tracking chambers
9cbdf048 764 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 765 // number of HitsForRec to 0 for the chamber
766 fNHitsForRecPerChamber[ch] = 0;
767 // index of first HitForRec for the chamber
768 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
769 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
9cbdf048 770 rawclusters = pMUON->RawClustAddress(ch);
771 pMUON->ResetRawClusters();
a9e2aefa 772 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
773 nclus = (Int_t) (rawclusters->GetEntries());
774 // Loop over (cathode correlated) raw clusters
775 for (iclus = 0; iclus < nclus; iclus++) {
776 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
777 // new AliMUONHitForRec from raw cluster
778 // and increment number of AliMUONHitForRec's (total and in chamber)
779 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
780 fNHitsForRec++;
781 (fNHitsForRecPerChamber[ch])++;
782 // more information into HitForRec
783 // resolution: info should be already in raw cluster and taken from it ????
784 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
785 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
786 // original raw cluster
787 hitForRec->SetChamberNumber(ch);
788 hitForRec->SetHitNumber(iclus);
ba5b68db 789 // Z coordinate of the raw cluster (cm)
cfe0107f 790 hitForRec->SetZ(clus->fZ[0]);
a9e2aefa 791 if (fPrintLevel >= 10) {
792 cout << "chamber (0...): " << ch <<
793 " raw cluster (0...): " << iclus << endl;
794 clus->Dump();
795 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
796 hitForRec->Dump();}
797 } // end of cluster loop
798 } // end of chamber loop
799 return;
800}
801
802 //__________________________________________________________________________
803void AliMUONEventReconstructor::MakeSegments(void)
804{
805 // To make the list of segments in all stations,
806 // from the list of hits to be reconstructed
807 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
808 ResetSegments();
809 // Loop over stations
9cbdf048 810 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 811 MakeSegmentsPerStation(st);
812 if (fPrintLevel >= 10) {
813 cout << "end of MakeSegments" << endl;
9cbdf048 814 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 815 cout << "station(0...): " << st
816 << " Segments: " << fNSegments[st]
817 << endl;
818 for (Int_t seg = 0;
819 seg < fNSegments[st];
820 seg++) {
821 cout << "Segment index(0...): " << seg << endl;
822 ((*fSegmentsPtr[st])[seg])->Dump();
823 }
824 }
825 }
826 return;
827}
828
829 //__________________________________________________________________________
830void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
831{
832 // To make the list of segments in station number "Station" (0...)
833 // from the list of hits to be reconstructed.
834 // Updates "fNSegments"[Station].
835 // Segments in stations 4 and 5 are sorted
836 // according to increasing absolute value of "impact parameter"
837 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
838 AliMUONSegment *segment;
839 Bool_t last2st;
840 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
d0bfce8d 841 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 842 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 843 if (fPrintLevel >= 1)
844 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
845 // first and second chambers (0...) in the station
846 Int_t ch1 = 2 * Station;
847 Int_t ch2 = ch1 + 1;
848 // variable true for stations downstream of the dipole:
849 // Station(0..4) equal to 3 or 4
850 if ((Station == 3) || (Station == 4)) {
851 last2st = kTRUE;
852 // maximum impact parameter (cm) according to fMinBendingMomentum...
853 maxImpactParam =
854 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
d0bfce8d 855 // minimum impact parameter (cm) according to fMaxBendingMomentum...
856 minImpactParam =
857 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
a9e2aefa 858 }
859 else last2st = kFALSE;
860 // extrapolation factor from Z of first chamber to Z of second chamber
861 // dZ to be changed to take into account fine structure of chambers ????
862 Double_t extrapFact =
9cbdf048 863 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 864 // index for current segment
865 Int_t segmentIndex = 0;
866 // Loop over HitsForRec in the first chamber of the station
867 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
868 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
869 hit1++) {
870 // pointer to the HitForRec
871 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
872 // extrapolation,
873 // on the straight line joining the HitForRec to the vertex (0,0,0),
874 // to the Z of the second chamber of the station
875 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
876 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
877 // Loop over HitsForRec in the second chamber of the station
878 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
879 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
880 hit2++) {
881 // pointer to the HitForRec
882 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
883 // absolute values of distances, in bending and non bending planes,
884 // between the HitForRec in the second chamber
885 // and the previous extrapolation
886 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
887 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
888 if (last2st) {
889 // bending slope
890 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
891 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
892 // absolute value of impact parameter
893 impactParam =
894 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
895 }
896 // check for distances not too large,
897 // and impact parameter not too big if stations downstream of the dipole.
898 // Conditions "distBend" and "impactParam" correlated for these stations ????
899 if ((distBend < fSegmentMaxDistBending[Station]) &&
900 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
d0bfce8d 901 (!last2st || (impactParam < maxImpactParam)) &&
902 (!last2st || (impactParam > minImpactParam))) {
a9e2aefa 903 // make new segment
904 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
905 AliMUONSegment(hit1Ptr, hit2Ptr);
906 // update "link" to this segment from the hit in the first chamber
907 if (hit1Ptr->GetNSegments() == 0)
908 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
909 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
910 if (fPrintLevel >= 10) {
911 cout << "segmentIndex(0...): " << segmentIndex
912 << " distBend: " << distBend
913 << " distNonBend: " << distNonBend
914 << endl;
915 segment->Dump();
916 cout << "HitForRec in first chamber" << endl;
917 hit1Ptr->Dump();
918 cout << "HitForRec in second chamber" << endl;
919 hit2Ptr->Dump();
920 };
921 // increment index for current segment
922 segmentIndex++;
923 }
924 } //for (Int_t hit2
925 } // for (Int_t hit1...
926 fNSegments[Station] = segmentIndex;
927 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
928 // i.e. Station(0..4) 3 or 4, using the function "Compare".
929 // After this sorting, it is impossible to use
930 // the "fNSegments" and "fIndexOfFirstSegment"
931 // of the HitForRec in the first chamber to explore all segments formed with it.
932 // Is this sorting really needed ????
933 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
934 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
935 << fNSegments[Station] << endl;
936 return;
937}
938
939 //__________________________________________________________________________
940void AliMUONEventReconstructor::MakeTracks(void)
941{
942 // To make the tracks,
943 // from the list of segments and points in all stations
944 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 945 // The order may be important for the following Reset's
a9e2aefa 946 ResetTracks();
8429a5e4 947 ResetTrackHits();
a9e2aefa 948 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
949 MakeTrackCandidates();
950 // Follow tracks in stations(1..) 3, 2 and 1
951 FollowTracks();
8429a5e4 952 // Remove double tracks
953 RemoveDoubleTracks();
a9e2aefa 954 return;
955}
956
957 //__________________________________________________________________________
958Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
959{
960 // To make track candidates with two segments in stations(1..) 4 and 5,
961 // the first segment being pointed to by "BegSegment".
962 // Returns the number of such track candidates.
963 Int_t endStation, iEndSegment, nbCan2Seg;
964 AliMUONSegment *endSegment, *extrapSegment;
965 AliMUONTrack *recTrack;
966 Double_t mcsFactor;
967 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
968 // Station for the end segment
969 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
970 // multiple scattering factor corresponding to one chamber
971 mcsFactor = 0.0136 /
972 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
973 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
974 // linear extrapolation to end station
975 extrapSegment =
976 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
977 // number of candidates with 2 segments to 0
978 nbCan2Seg = 0;
979 // Loop over segments in the end station
980 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
981 // pointer to segment
982 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
983 // test compatibility between current segment and "extrapSegment"
04b5ea16 984 // 4 because 4 quantities in chi2
a9e2aefa 985 if ((endSegment->
986 NormalizedChi2WithSegment(extrapSegment,
987 fMaxSigma2Distance)) <= 4.0) {
988 // both segments compatible:
989 // make track candidate from "begSegment" and "endSegment"
990 if (fPrintLevel >= 2)
991 cout << "TrackCandidate with Segment " << iEndSegment <<
992 " in Station(0..) " << endStation << endl;
993 // flag for both segments in one track:
994 // to be done in track constructor ????
995 BegSegment->SetInTrack(kTRUE);
996 endSegment->SetInTrack(kTRUE);
997 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
998 AliMUONTrack(BegSegment, endSegment, this);
999 fNRecTracks++;
1000 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1001 // increment number of track candidates with 2 segments
1002 nbCan2Seg++;
1003 }
1004 } // for (iEndSegment = 0;...
1005 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1006 return nbCan2Seg;
1007}
1008
1009 //__________________________________________________________________________
1010Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1011{
1012 // To make track candidates with one segment and one point
1013 // in stations(1..) 4 and 5,
1014 // the segment being pointed to by "BegSegment".
1015 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1016 AliMUONHitForRec *extrapHitForRec, *hit;
1017 AliMUONTrack *recTrack;
1018 Double_t mcsFactor;
1019 if (fPrintLevel >= 1)
1020 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1021 // station for the end point
1022 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1023 // multiple scattering factor corresponding to one chamber
1024 mcsFactor = 0.0136 /
1025 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1026 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1027 // first and second chambers(0..) in the end station
1028 ch1 = 2 * endStation;
1029 ch2 = ch1 + 1;
1030 // number of candidates to 0
1031 nbCan1Seg1Hit = 0;
1032 // Loop over chambers of the end station
1033 for (ch = ch2; ch >= ch1; ch--) {
1034 // linear extrapolation to chamber
1035 extrapHitForRec =
1036 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1037 // limits for the hit index in the loop
1038 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1039 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1040 // Loop over HitForRec's in the chamber
1041 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1042 // pointer to HitForRec
1043 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1044 // test compatibility between current HitForRec and "extrapHitForRec"
04b5ea16 1045 // 2 because 2 quantities in chi2
a9e2aefa 1046 if ((hit->
1047 NormalizedChi2WithHitForRec(extrapHitForRec,
1048 fMaxSigma2Distance)) <= 2.0) {
1049 // both HitForRec's compatible:
1050 // make track candidate from begSegment and current HitForRec
1051 if (fPrintLevel >= 2)
1052 cout << "TrackCandidate with HitForRec " << iHit <<
1053 " in Chamber(0..) " << ch << endl;
1054 // flag for beginning segments in one track:
1055 // to be done in track constructor ????
1056 BegSegment->SetInTrack(kTRUE);
1057 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1058 AliMUONTrack(BegSegment, hit, this);
1059 // the right place to eliminate "double counting" ???? how ????
1060 fNRecTracks++;
1061 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1062 // increment number of track candidates
1063 nbCan1Seg1Hit++;
1064 }
1065 } // for (iHit = iHitMin;...
1066 delete extrapHitForRec;
1067 } // for (ch = ch2;...
1068 return nbCan1Seg1Hit;
1069}
1070
1071 //__________________________________________________________________________
1072void AliMUONEventReconstructor::MakeTrackCandidates(void)
1073{
1074 // To make track candidates
1075 // with at least 3 aligned points in stations(1..) 4 and 5
1076 // (two Segment's or one Segment and one HitForRec)
1077 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1078 AliMUONSegment *begSegment;
1079 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1080 // Loop over stations(1..) 5 and 4 for the beginning segment
1081 for (begStation = 4; begStation > 2; begStation--) {
1082 // Loop over segments in the beginning station
1083 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1084 // pointer to segment
1085 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1086 if (fPrintLevel >= 2)
1087 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1088 " in Station(0..) " << begStation << endl;
1089 // Look for track candidates with two segments,
1090 // "begSegment" and all compatible segments in other station.
1091 // Only for beginning station(1..) 5
1092 // because candidates with 2 segments have to looked for only once.
1093 if (begStation == 4)
1094 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
956019b6 1095 // Look for track candidates with one segment and one point,
a9e2aefa 1096 // "begSegment" and all compatible HitForRec's in other station.
1097 // Only if "begSegment" does not belong already to a track candidate.
1098 // Is that a too strong condition ????
1099 if (!(begSegment->GetInTrack()))
1100 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1101 } // for (iBegSegment = 0;...
1102 } // for (begStation = 4;...
1103 return;
1104}
1105
1106 //__________________________________________________________________________
1107void AliMUONEventReconstructor::FollowTracks(void)
1108{
1109 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1110 // too long: should be made more modular !!!!
d0bfce8d 1111 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1112 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
04b5ea16 1113 AliMUONTrack *track, *nextTrack;
1114 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1115 // -1 to avoid compilation warnings
1116 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1117 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
d0bfce8d 1118 Double_t bendingMomentum, chi2Norm = 0.;
9cbdf048 1119 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1120 // local maxSigma2Distance, for easy increase in testing
1121 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1122 if (fPrintLevel >= 2)
1123 cout << "enter FollowTracks" << endl;
1124 // Loop over track candidates
04b5ea16 1125 track = (AliMUONTrack*) fRecTracksPtr->First();
1126 trackIndex = -1;
1127 while (track) {
1128 // Follow function for each track candidate ????
1129 trackIndex++;
1130 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1131 if (fPrintLevel >= 2)
1132 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 1133 // Fit track candidate
1134 track->SetFitMCS(0); // without multiple Coulomb scattering
1135 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1136 track->SetFitStart(0); // from parameters at vertex
1137 track->Fit();
a9e2aefa 1138 if (fPrintLevel >= 10) {
1139 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1140 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1141 track->RecursiveDump();
1142 }
1143 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1144 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1145 // otherwise: majority coincidence 2 !!!!
a9e2aefa 1146 for (station = 2; station >= 0; station--) {
1147 // Track parameters at first track hit (smallest Z)
1148 trackParam1 = ((AliMUONTrackHit*)
1149 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1150 // extrapolation to station
1151 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 1152 extrapSegment = new AliMUONSegment(); // empty segment
d0bfce8d 1153 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
a9e2aefa 1154 // multiple scattering factor corresponding to one chamber
1155 // and momentum in bending plane (not total)
1156 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1157 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1158 // Z difference from previous station
9cbdf048 1159 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1160 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1161 // Z difference between the two previous stations
9cbdf048 1162 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1163 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 1164 // Z difference between the two chambers in the previous station
1165 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1166 (&(pMUON->Chamber(2 * station + 1)))->Z();
1167 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1168 extrapSegment->
1169 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1170 extrapSegment->UpdateFromStationTrackParam
1171 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1172 trackParam1->GetInverseBendingMomentum());
d0bfce8d 1173 // same thing for corrected segment
1174 // better to use copy constructor, after checking that it works properly !!!!
1175 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1176 extrapCorrSegment->
1177 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1178 extrapCorrSegment->UpdateFromStationTrackParam
1179 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1180 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1181 bestChi2 = 5.0;
1182 bestSegment = NULL;
1183 if (fPrintLevel >= 10) {
1184 cout << "FollowTracks: track candidate(0..): " << trackIndex
1185 << " Look for segment in station(0..): " << station << endl;
1186 }
1187 // Loop over segments in station
1188 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1189 // Look for best compatible Segment in station
1190 // should consider all possibilities ????
1191 // multiple scattering ????
1192 // separation in 2 functions: Segment and HitForRec ????
1193 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
d0bfce8d 1194 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1195 // according to real Z value of "segment" and slopes of "extrapSegment"
1196 extrapCorrSegment->
1197 SetBendingCoor(extrapSegment->GetBendingCoor() +
1198 extrapSegment->GetBendingSlope() *
1199 (segment->GetHitForRec1()->GetZ() -
1200 (&(pMUON->Chamber(2 * station)))->Z()));
1201 extrapCorrSegment->
1202 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1203 extrapSegment->GetNonBendingSlope() *
1204 (segment->GetHitForRec1()->GetZ() -
1205 (&(pMUON->Chamber(2 * station)))->Z()));
1206 chi2 = segment->
1207 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
a9e2aefa 1208 if (chi2 < bestChi2) {
1209 // update best Chi2 and Segment if better found
1210 bestSegment = segment;
1211 bestChi2 = chi2;
1212 }
1213 }
1214 if (bestSegment) {
1215 // best segment found: add it to track candidate
1216 track->AddSegment(bestSegment);
1217 // set track parameters at these two TrakHit's
1218 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1219 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1220 if (fPrintLevel >= 10) {
1221 cout << "FollowTracks: track candidate(0..): " << trackIndex
1222 << " Added segment in station(0..): " << station << endl;
1223 track->RecursiveDump();
1224 }
1225 }
1226 else {
1227 // No best segment found:
1228 // Look for best compatible HitForRec in station:
1229 // should consider all possibilities ????
1230 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1231 extrapHit = new AliMUONHitForRec(); // empty hit
d0bfce8d 1232 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
a9e2aefa 1233 bestChi2 = 3.0;
1234 bestHit = NULL;
1235 if (fPrintLevel >= 10) {
1236 cout << "FollowTracks: track candidate(0..): " << trackIndex
1237 << " Segment not found, look for hit in station(0..): " << station
1238 << endl;
1239 }
1240 // Loop over chambers of the station
d82671a0 1241 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1242 // coordinates of extrapolated hit
d82671a0 1243 extrapHit->
1244 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1245 extrapHit->
1246 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1247 // resolutions from "extrapSegment"
1248 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1249 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
d0bfce8d 1250 // same things for corrected hit
1251 // better to use copy constructor, after checking that it works properly !!!!
1252 extrapCorrHit->
1253 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1254 extrapCorrHit->
1255 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1256 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1257 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
a9e2aefa 1258 // Loop over hits in the chamber
956019b6 1259 ch = 2 * station + chInStation;
a9e2aefa 1260 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1261 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1262 fNHitsForRecPerChamber[ch];
1263 iHit++) {
1264 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
d0bfce8d 1265 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1266 // according to real Z value of "hit" and slopes of right "trackParam"
1267 extrapCorrHit->
1268 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1269 (&(trackParam[chInStation]))->GetBendingSlope() *
1270 (hit->GetZ() -
1271 (&(trackParam[chInStation]))->GetZ()));
1272 extrapCorrHit->
1273 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1274 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1275 (hit->GetZ() -
1276 (&(trackParam[chInStation]))->GetZ()));
a9e2aefa 1277 // condition for hit not already in segment ????
1278 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1279 if (chi2 < bestChi2) {
1280 // update best Chi2 and HitForRec if better found
1281 bestHit = hit;
1282 bestChi2 = chi2;
d82671a0 1283 chBestHit = chInStation;
a9e2aefa 1284 }
1285 }
1286 }
1287 if (bestHit) {
1288 // best hit found: add it to track candidate
1289 track->AddHitForRec(bestHit);
956019b6 1290 // set track parameters at this TrackHit
a9e2aefa 1291 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1292 &(trackParam[chBestHit]));
1293 if (fPrintLevel >= 10) {
1294 cout << "FollowTracks: track candidate(0..): " << trackIndex
1295 << " Added hit in station(0..): " << station << endl;
1296 track->RecursiveDump();
1297 }
1298 }
1299 else {
8429a5e4 1300 // Remove current track candidate
1301 // and corresponding TrackHit's, ...
1302 track->Remove();
04b5ea16 1303 delete extrapSegment;
d0bfce8d 1304 delete extrapCorrSegment;
1305 delete extrapHit;
1306 delete extrapCorrHit;
a9e2aefa 1307 break; // stop the search for this candidate:
1308 // exit from the loop over station
1309 }
d0bfce8d 1310 delete extrapHit;
1311 delete extrapCorrHit;
a9e2aefa 1312 }
04b5ea16 1313 delete extrapSegment;
d0bfce8d 1314 delete extrapCorrSegment;
a9e2aefa 1315 // Sort track hits according to increasing Z
1316 track->GetTrackHitsPtr()->Sort();
1317 // Update track parameters at first track hit (smallest Z)
1318 trackParam1 = ((AliMUONTrackHit*)
1319 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
d0bfce8d 1320 bendingMomentum = 0.;
1321 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1322 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1323 // Track removed if bendingMomentum not in window [min, max]
1324 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1325 track->Remove();
1326 break; // stop the search for this candidate:
1327 // exit from the loop over station
1328 }
956019b6 1329 // Track fit
04b5ea16 1330 // with multiple Coulomb scattering if all stations
1331 if (station == 0) track->SetFitMCS(1);
956019b6 1332 // without multiple Coulomb scattering if not all stations
04b5ea16 1333 else track->SetFitMCS(0);
956019b6 1334 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1335 track->SetFitStart(1); // from parameters at first hit
1336 track->Fit();
d0bfce8d 1337 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1338 if (numberOfDegFree > 0) {
1339 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1340 } else {
1341 chi2Norm = 1.e10;
1342 }
1343 // Track removed if normalized chi2 too high
1344 if (chi2Norm > fMaxChi2) {
1345 track->Remove();
1346 break; // stop the search for this candidate:
1347 // exit from the loop over station
1348 }
a9e2aefa 1349 if (fPrintLevel >= 10) {
1350 cout << "FollowTracks: track candidate(0..): " << trackIndex
1351 << " after fit from station(0..): " << station << " to 4" << endl;
1352 track->RecursiveDump();
1353 }
04b5ea16 1354 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1355 // after going through the first station
04b5ea16 1356 if (station == 0) {
1357 trackParamVertex = *trackParam1;
1358 (&trackParamVertex)->ExtrapToVertex();
1359 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1360 if (fPrintLevel >= 1) {
1361 cout << "FollowTracks: track candidate(0..): " << trackIndex
1362 << " after extrapolation to vertex" << endl;
1363 track->RecursiveDump();
1364 }
04b5ea16 1365 }
a9e2aefa 1366 } // for (station = 2;...
04b5ea16 1367 // go really to next track
1368 track = nextTrack;
1369 } // while (track)
1370 // Compression of track array (necessary after Remove ????)
1371 fRecTracksPtr->Compress();
1372 return;
1373}
1374
1375 //__________________________________________________________________________
8429a5e4 1376void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1377{
1378 // To remove double tracks.
1379 // Tracks are considered identical
1380 // if they have at least half of their hits in common.
1381 // Among two identical tracks, one keeps the track with the larger number of hits
1382 // or, if these numbers are equal, the track with the minimum Chi2.
1383 AliMUONTrack *track1, *track2, *trackToRemove;
1384 Bool_t identicalTracks;
1385 Int_t hitsInCommon, nHits1, nHits2;
1386 identicalTracks = kTRUE;
1387 while (identicalTracks) {
1388 identicalTracks = kFALSE;
1389 // Loop over first track of the pair
1390 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1391 while (track1 && (!identicalTracks)) {
1392 nHits1 = track1->GetNTrackHits();
1393 // Loop over second track of the pair
1394 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1395 while (track2 && (!identicalTracks)) {
1396 nHits2 = track2->GetNTrackHits();
1397 // number of hits in common between two tracks
1398 hitsInCommon = track1->HitsInCommon(track2);
1399 // check for identical tracks
1400 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1401 identicalTracks = kTRUE;
1402 // decide which track to remove
1403 if (nHits1 > nHits2) trackToRemove = track2;
1404 else if (nHits1 < nHits2) trackToRemove = track1;
1405 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1406 trackToRemove = track2;
1407 else trackToRemove = track1;
1408 // remove it
1409 trackToRemove->Remove();
1410 }
1411 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1412 } // track2
1413 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1414 } // track1
1415 }
1416 return;
1417}
1418
1419 //__________________________________________________________________________
04b5ea16 1420void AliMUONEventReconstructor::EventDump(void)
1421{
1422 // Dump reconstructed event (track parameters at vertex and at first hit),
1423 // and the particle parameters
1424
1425 AliMUONTrack *track;
1426 AliMUONTrackParam *trackParam, *trackParam1;
04b5ea16 1427 TParticle *p;
1428 Double_t bendingSlope, nonBendingSlope, pYZ;
1429 Double_t pX, pY, pZ, x, y, z, c;
1430 Int_t np, trackIndex, nTrackHits;
1431
1432 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1433 if (fPrintLevel >= 1) {
1434 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1435 }
1436 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1437 // Loop over reconstructed tracks
1438 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1439 if (fPrintLevel >= 1)
1440 cout << " track number: " << trackIndex << endl;
1441 // function for each track for modularity ????
1442 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1443 nTrackHits = track->GetNTrackHits();
1444 if (fPrintLevel >= 1)
1445 cout << " number of track hits: " << nTrackHits << endl;
1446 // track parameters at Vertex
1447 trackParam = track->GetTrackParamAtVertex();
1448 x = trackParam->GetNonBendingCoor();
1449 y = trackParam->GetBendingCoor();
1450 z = trackParam->GetZ();
1451 bendingSlope = trackParam->GetBendingSlope();
1452 nonBendingSlope = trackParam->GetNonBendingSlope();
1453 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1454 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1455 pX = pZ * nonBendingSlope;
1456 pY = pZ * bendingSlope;
1457 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1458 if (fPrintLevel >= 1)
1459 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1460 z, x, y, pX, pY, pZ, c);
1461
1462 // track parameters at first hit
1463 trackParam1 = ((AliMUONTrackHit*)
1464 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1465 x = trackParam1->GetNonBendingCoor();
1466 y = trackParam1->GetBendingCoor();
1467 z = trackParam1->GetZ();
1468 bendingSlope = trackParam1->GetBendingSlope();
1469 nonBendingSlope = trackParam1->GetNonBendingSlope();
1470 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1471 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1472 pX = pZ * nonBendingSlope;
1473 pY = pZ * bendingSlope;
1474 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1475 if (fPrintLevel >= 1)
1476 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1477 z, x, y, pX, pY, pZ, c);
1478 }
1479 // informations about generated particles
2ab0c725 1480 np = gAlice->GetNtrack();
04b5ea16 1481 printf(" **** number of generated particles: %d \n", np);
1482
1483 for (Int_t iPart = 0; iPart < np; iPart++) {
2ab0c725 1484 p = gAlice->Particle(iPart);
04b5ea16 1485 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1486 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1487 }
a9e2aefa 1488 return;
1489}
1490
c7ba256d 1491void AliMUONEventReconstructor::FillEvent()
1492{
1493// Create a new AliMUONRecoEvent, fill its track list, then add it as a
1494// leaf in the Event branch of TreeRecoEvent tree
1495 cout << "Enter FillEvent() ...\n";
1496
1497 if (!fRecoEvent) {
1498 fRecoEvent = new AliMUONRecoEvent();
1499 } else {
1500 fRecoEvent->Clear();
1501 }
1502 //save current directory
1503 TDirectory *current = gDirectory;
1504 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1505 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1506 if (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1507 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1508 TBranch *branch = fEventTree->GetBranch("Event");
1509 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000,1);
1510 branch->SetAutoDelete();
1511 fTreeFile->cd();
1512 fEventTree->Fill();
1513 fTreeFile->Write();
1514 }
1515 // restore directory
1516 current->cd();
1517}