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