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