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[u/mrichter/AliRoot.git] / MUON / AliMUONEventReconstructor.cxx
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a9e2aefa 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/*
17$Log$
c7ba256d 18Revision 1.18 2000/10/26 12:47:03 gosset
19Real distance between chambers of each station taken into account
20for the reconstruction parameters "fSegmentMaxDistBending[5]"
21
860cef81 22Revision 1.17 2000/10/24 09:26:20 gosset
23Comments updated
24
ba5b68db 25Revision 1.16 2000/10/24 09:22:35 gosset
26Method AddHitsForRecFromRawClusters: real Z of raw cluster and not Z of chamber
27
cfe0107f 28Revision 1.15 2000/10/12 15:17:30 gosset
29Sign of fSimpleBValue corrected: sign ox Bx and not Bz (thanks to Galina)
30
065bd0e1 31Revision 1.14 2000/10/04 18:21:26 morsch
32Include stdlib.h
33
e7d455d5 34Revision 1.13 2000/10/02 21:28:09 fca
35Removal of useless dependecies via forward declarations
36
94de3818 37Revision 1.12 2000/10/02 16:58:29 egangler
38Cleaning of the code :
39-> coding conventions
40-> void Streamers
41-> some useless includes removed or replaced by "class" statement
42
ecfa008b 43Revision 1.11 2000/09/22 09:16:33 hristov
44Casting needed on DEC
45
8832c7b4 46Revision 1.10 2000/09/19 09:49:50 gosset
47AliMUONEventReconstructor package
48* track extrapolation independent from reco_muon.F, use of AliMagF...
49* possibility to use new magnetic field (automatic from generated root file)
50
a6f03ddb 51Revision 1.9 2000/07/20 12:45:27 gosset
52New "EventReconstructor..." structure,
53 hopefully more adapted to tree/streamer.
54"AliMUONEventReconstructor::RemoveDoubleTracks"
55 to keep only one track among similar ones.
56
8429a5e4 57Revision 1.8 2000/07/18 16:04:06 gosset
58AliMUONEventReconstructor package:
59* a few minor modifications and more comments
60* a few corrections
61 * right sign for Z of raw clusters
62 * right loop over chambers inside station
63 * symmetrized covariance matrix for measurements (TrackChi2MCS)
64 * right sign of charge in extrapolation (ExtrapToZ)
65 * right zEndAbsorber for Branson correction below 3 degrees
66* use of TVirtualFitter instead of TMinuit for AliMUONTrack::Fit
67* no parameter for AliMUONTrack::Fit() but more fit parameters in Track object
68
956019b6 69Revision 1.7 2000/07/03 12:28:06 gosset
70Printout at the right place after extrapolation to vertex
71
6ae236ee 72Revision 1.6 2000/06/30 12:01:06 gosset
73Correction for hit search in the right chamber (JPC)
74
d82671a0 75Revision 1.5 2000/06/30 10:15:48 gosset
76Changes to EventReconstructor...:
77precision fit with multiple Coulomb scattering;
78extrapolation to vertex with Branson correction in absorber (JPC)
79
04b5ea16 80Revision 1.4 2000/06/27 14:11:36 gosset
81Corrections against violations of coding conventions
82
9cbdf048 83Revision 1.3 2000/06/16 07:27:08 gosset
84To remove problem in running RuleChecker, like in MUON-dev
85
79e1e601 86Revision 1.1.2.5 2000/06/16 07:00:26 gosset
87To remove problem in running RuleChecker
88
a9e2aefa 89Revision 1.1.2.4 2000/06/12 08:00:07 morsch
90Dummy streamer to solve CINT compilation problem (to be investigated !)
91
92Revision 1.1.2.3 2000/06/09 20:59:57 morsch
93Make includes consistent with new file structure.
94
95Revision 1.1.2.2 2000/06/09 12:58:05 gosset
96Removed comment beginnings in Log sections of .cxx files
97Suppressed most violations of coding rules
98
99Revision 1.1.2.1 2000/06/07 14:44:53 gosset
100Addition of files for track reconstruction in C++
101*/
102
103//__________________________________________________________________________
104//
105// MUON event reconstructor in ALICE
106//
107// This class contains as data:
108// * the parameters for the event reconstruction
109// * a pointer to the array of hits to be reconstructed (the event)
110// * a pointer to the array of segments made with these hits inside each station
111// * a pointer to the array of reconstructed tracks
112//
113// It contains as methods, among others:
114// * MakeEventToBeReconstructed to build the array of hits to be reconstructed
115// * MakeSegments to build the segments
116// * MakeTracks to build the tracks
117//__________________________________________________________________________
118
119#include <iostream.h>
e7d455d5 120#include <stdlib.h>
a9e2aefa 121
122#include <TRandom.h>
123#include <TFile.h>
94de3818 124#include <TTree.h>
a9e2aefa 125
a9e2aefa 126#include "AliMUONEventReconstructor.h"
127#include "AliMUON.h"
128#include "AliMUONHitForRec.h"
129#include "AliMUONSegment.h"
130#include "AliMUONHit.h"
131#include "AliMUONRawCluster.h"
132#include "AliMUONTrack.h"
133#include "AliMUONChamber.h"
134#include "AliMUONTrackHit.h"
94de3818 135#include "AliMagF.h"
a9e2aefa 136#include "AliRun.h"
04b5ea16 137#include "TParticle.h"
c7ba256d 138#include "AliMUONRecoEvent.h"
a9e2aefa 139
a9e2aefa 140//************* Defaults parameters for reconstruction
9cbdf048 141static const Double_t kDefaultMinBendingMomentum = 3.0;
142static const Double_t kDefaultMaxSigma2Distance = 16.0;
143static const Double_t kDefaultBendingResolution = 0.01;
144static const Double_t kDefaultNonBendingResolution = 0.144;
145static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 146// Simple magnetic field:
147// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
148// Length and Position from reco_muon.F, with opposite sign:
149// Length = ZMAGEND-ZCOIL
150// Position = (ZMAGEND+ZCOIL)/2
151// to be ajusted differently from real magnetic field ????
9cbdf048 152static const Double_t kDefaultSimpleBValue = 7.0;
153static const Double_t kDefaultSimpleBLength = 428.0;
154static const Double_t kDefaultSimpleBPosition = 1019.0;
155static const Int_t kDefaultRecGeantHits = 0;
156static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 157
9cbdf048 158static const Int_t kDefaultPrintLevel = 0;
a9e2aefa 159
160ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
161
162 //__________________________________________________________________________
163AliMUONEventReconstructor::AliMUONEventReconstructor(void)
164{
165 // Constructor for class AliMUONEventReconstructor
166 SetReconstructionParametersToDefaults();
167 // Memory allocation for the TClonesArray of hits for reconstruction
168 // Is 10000 the right size ????
169 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
170 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
171 // Memory allocation for the TClonesArray's of segments in stations
172 // Is 2000 the right size ????
9cbdf048 173 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 174 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
175 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
176 }
177 // Memory allocation for the TClonesArray of reconstructed tracks
178 // Is 10 the right size ????
179 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
180 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
8429a5e4 181 // Memory allocation for the TClonesArray of hits on reconstructed tracks
182 // Is 100 the right size ????
183 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
184 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
a9e2aefa 185
065bd0e1 186 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
a6f03ddb 187 Float_t b[3], x[3];
188 x[0] = 50.; x[1] = 50.; x[2] = 950.;
189 gAlice->Field()->Field(x, b);
065bd0e1 190 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
a6f03ddb 191 // See how to get fSimple(BValue, BLength, BPosition)
192 // automatically calculated from the actual magnetic field ????
a9e2aefa 193
194 if (fPrintLevel >= 0) {
a6f03ddb 195 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
196 cout << endl << "Magnetic field from root file:" << endl;
197 gAlice->Field()->Dump();
198 cout << endl;
199 }
c7ba256d 200
201 // Initialize to 0 pointers to RecoEvent, tree and tree file
202 fRecoEvent = 0;
203 fEventTree = 0;
204 fTreeFile = 0;
205
a9e2aefa 206 return;
207}
208
9cbdf048 209AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor)
210{
211 // Dummy copy constructor
212}
213
214AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& Reconstructor)
215{
216 // Dummy assignment operator
217 return *this;
218}
219
a9e2aefa 220 //__________________________________________________________________________
221AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
222{
223 // Destructor for class AliMUONEventReconstructor
c7ba256d 224 if (fTreeFile) {
225 fTreeFile->Close();
226 delete fTreeFile;
227 }
228// if (fEventTree) delete fEventTree;
229 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 230 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 231 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 232 delete fSegmentsPtr[st]; // Correct destruction of everything ????
233 return;
234}
235
236 //__________________________________________________________________________
237void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
238{
239 // Set reconstruction parameters to default values
240 // Would be much more convenient with a structure (or class) ????
9cbdf048 241 fMinBendingMomentum = kDefaultMinBendingMomentum;
242 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 243
9cbdf048 244 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 245 // ******** Parameters for making HitsForRec
246 // minimum radius,
247 // like in TRACKF_STAT:
248 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
249 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
9cbdf048 250 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
251 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 252 2.0 * TMath::Pi() / 180.0;
253 else fRMin[ch] = 30.0;
254 }
255 // maximum radius
256 // like in TRACKF_STAT (10 degrees ????)
257 fRMax[0] = fRMax[1] = 91.5;
258 fRMax[2] = fRMax[3] = 122.5;
259 fRMax[4] = fRMax[5] = 158.3;
260 fRMax[6] = fRMax[7] = 260.0;
261 fRMax[8] = fRMax[9] = 260.0;
262
263 // ******** Parameters for making segments
264 // should be parametrized ????
265 // according to interval between chambers in a station ????
266 // Maximum distance in non bending plane
267 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
268 // SIGCUT*DYMAX(IZ)
9cbdf048 269 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 270 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 271 // Maximum distance in bending plane:
272 // values from TRACKF_STAT, corresponding to (J psi 20cm),
273 // scaled to the real distance between chambers in a station
274 fSegmentMaxDistBending[0] = 1.5 *
275 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
276 fSegmentMaxDistBending[1] = 1.5 *
277 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
278 fSegmentMaxDistBending[2] = 3.0 *
279 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
280 fSegmentMaxDistBending[3] = 6.0 *
281 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
282 fSegmentMaxDistBending[4] = 6.0 *
283 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
a9e2aefa 284
9cbdf048 285 fBendingResolution = kDefaultBendingResolution;
286 fNonBendingResolution = kDefaultNonBendingResolution;
287 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
288 fSimpleBValue = kDefaultSimpleBValue;
289 fSimpleBLength = kDefaultSimpleBLength;
290 fSimpleBPosition = kDefaultSimpleBPosition;
291 fRecGeantHits = kDefaultRecGeantHits;
292 fEfficiency = kDefaultEfficiency;
293 fPrintLevel = kDefaultPrintLevel;
a9e2aefa 294 return;
295}
296
297//__________________________________________________________________________
298Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum)
299{
300 // Returns impact parameter at vertex in bending plane (cm),
301 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
302 // using simple values for dipole magnetic field.
065bd0e1 303 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 304 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
305 BendingMomentum);
306}
307
308//__________________________________________________________________________
309Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam)
310{
311 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 312 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 313 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
314 // using simple values for dipole magnetic field.
a9e2aefa 315 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
316 ImpactParam);
317}
318
319//__________________________________________________________________________
320void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
321{
322 // Set background file ... for GEANT hits
323 // Must be called after having loaded the firts signal event
324 if (fPrintLevel >= 0) {
325 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
326 << BkgGeantFileName << "''" << endl;}
327 if (strlen(BkgGeantFileName)) {
328 // BkgGeantFileName not empty: try to open the file
329 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
330 fBkgGeantFile = new TFile(BkgGeantFileName);
331 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
332 if (fBkgGeantFile-> IsOpen()) {
333 if (fPrintLevel >= 0) {
334 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
335 << "'' successfully opened" << endl;}
336 }
337 else {
338 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
339 cout << "NOT FOUND: EXIT" << endl;
340 exit(0); // right instruction for exit ????
341 }
342 // Arrays for "particles" and "hits"
343 fBkgGeantParticles = new TClonesArray("TParticle", 200);
344 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
345 // Event number to -1 for initialization
346 fBkgGeantEventNumber = -1;
347 // Back to the signal file:
348 // first signal event must have been loaded previously,
349 // otherwise, Segmentation violation at the next instruction
350 // How is it possible to do smething better ????
351 ((gAlice->TreeK())->GetCurrentFile())->cd();
352 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
353 }
354 return;
355}
356
357//__________________________________________________________________________
358void AliMUONEventReconstructor::NextBkgGeantEvent(void)
359{
360 // Get next event in background file for GEANT hits
361 // Goes back to event number 0 when end of file is reached
362 char treeName[20];
363 TBranch *branch;
364 if (fPrintLevel >= 0) {
365 cout << "Enter NextBkgGeantEvent" << endl;}
366 // Clean previous event
367 if(fBkgGeantTK) delete fBkgGeantTK;
368 fBkgGeantTK = NULL;
369 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
370 if(fBkgGeantTH) delete fBkgGeantTH;
371 fBkgGeantTH = NULL;
372 if(fBkgGeantHits) fBkgGeantHits->Clear();
373 // Increment event number
374 fBkgGeantEventNumber++;
375 // Get access to Particles and Hits for event from background file
376 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
377 fBkgGeantFile->cd();
378 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
379 // Particles: TreeK for event and branch "Particles"
380 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
381 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
382 if (!fBkgGeantTK) {
383 if (fPrintLevel >= 0) {
384 cout << "Cannot find Kine Tree for background event: " <<
385 fBkgGeantEventNumber << endl;
386 cout << "Goes back to event 0" << endl;
387 }
388 fBkgGeantEventNumber = 0;
389 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
390 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
391 if (!fBkgGeantTK) {
392 cout << "ERROR: cannot find Kine Tree for background event: " <<
393 fBkgGeantEventNumber << endl;
394 exit(0);
395 }
396 }
397 if (fBkgGeantTK)
398 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
399 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
400 // Hits: TreeH for event and branch "MUON"
401 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
402 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
403 if (!fBkgGeantTH) {
404 cout << "ERROR: cannot find Hits Tree for background event: " <<
405 fBkgGeantEventNumber << endl;
406 exit(0);
407 }
408 if (fBkgGeantTH && fBkgGeantHits) {
409 branch = fBkgGeantTH->GetBranch("MUON");
410 if (branch) branch->SetAddress(&fBkgGeantHits);
411 }
412 fBkgGeantTH->GetEntries(); // necessary ????
413 // Back to the signal file
414 ((gAlice->TreeK())->GetCurrentFile())->cd();
415 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
416 return;
417}
418
419//__________________________________________________________________________
420void AliMUONEventReconstructor::EventReconstruct(void)
421{
422 // To reconstruct one event
423 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
424 MakeEventToBeReconstructed();
425 MakeSegments();
426 MakeTracks();
427 return;
428}
429
430 //__________________________________________________________________________
431void AliMUONEventReconstructor::ResetHitsForRec(void)
432{
433 // To reset the array and the number of HitsForRec,
434 // and also the number of HitsForRec
435 // and the index of the first HitForRec per chamber
436 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
437 fNHitsForRec = 0;
9cbdf048 438 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 439 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
440 return;
441}
442
443 //__________________________________________________________________________
444void AliMUONEventReconstructor::ResetSegments(void)
445{
446 // To reset the TClonesArray of segments and the number of Segments
447 // for all stations
9cbdf048 448 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 449 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
450 fNSegments[st] = 0;
451 }
452 return;
453}
454
455 //__________________________________________________________________________
456void AliMUONEventReconstructor::ResetTracks(void)
457{
458 // To reset the TClonesArray of reconstructed tracks
8429a5e4 459 if (fRecTracksPtr) fRecTracksPtr->Delete();
460 // Delete in order that the Track destructors are called,
461 // hence the space for the TClonesArray of pointers to TrackHit's is freed
a9e2aefa 462 fNRecTracks = 0;
463 return;
464}
465
8429a5e4 466 //__________________________________________________________________________
467void AliMUONEventReconstructor::ResetTrackHits(void)
468{
469 // To reset the TClonesArray of hits on reconstructed tracks
470 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
471 fNRecTrackHits = 0;
472 return;
473}
474
a9e2aefa 475 //__________________________________________________________________________
476void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
477{
478 // To make the list of hits to be reconstructed,
479 // either from the GEANT hits or from the raw clusters
480 // according to the parameter set for the reconstructor
481 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
482 ResetHitsForRec();
483 if (fRecGeantHits == 1) {
484 // Reconstruction from GEANT hits
485 // Back to the signal file
486 ((gAlice->TreeK())->GetCurrentFile())->cd();
487 // Signal hits
488 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
489 // Security on MUON ????
490 AddHitsForRecFromGEANT(gAlice->TreeH());
491 // Background hits
492 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
493 // Sort HitsForRec in increasing order with respect to chamber number
494 SortHitsForRecWithIncreasingChamber();
495 }
496 else {
497 // Reconstruction from raw clusters
498 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
499 // Security on MUON ????
500 // TreeR assumed to be be "prepared" in calling function
501 // by "MUON->GetTreeR(nev)" ????
9cbdf048 502 TTree *treeR = gAlice->TreeR();
503 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 504 // No sorting: it is done automatically in the previous function
505 }
506 if (fPrintLevel >= 10) {
507 cout << "end of MakeEventToBeReconstructed" << endl;
508 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 509 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 510 cout << "chamber(0...): " << ch
511 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
512 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
513 << endl;
514 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
515 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
516 hit++) {
517 cout << "HitForRec index(0...): " << hit << endl;
518 ((*fHitsForRecPtr)[hit])->Dump();
519 }
520 }
521 }
522 return;
523}
524
525 //__________________________________________________________________________
526void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
527{
528 // To add to the list of hits for reconstruction
529 // the GEANT signal hits from a hit tree TH.
530 if (fPrintLevel >= 2)
531 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
532 if (TH == NULL) return;
9cbdf048 533 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 534 // Security on MUON ????
535 // See whether it could be the same for signal and background ????
536 // Loop over tracks in tree
537 Int_t ntracks = (Int_t) TH->GetEntries();
538 if (fPrintLevel >= 2)
539 cout << "ntracks: " << ntracks << endl;
540 for (Int_t track = 0; track < ntracks; track++) {
541 gAlice->ResetHits();
542 TH->GetEvent(track);
543 // Loop over hits
544 Int_t hit = 0;
9cbdf048 545 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
a9e2aefa 546 mHit;
9cbdf048 547 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
a9e2aefa 548 NewHitForRecFromGEANT(mHit,track, hit, 1);
549 } // end of hit loop
550 } // end of track loop
551 return;
552}
553
554 //__________________________________________________________________________
555void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
556{
557 // To add to the list of hits for reconstruction
558 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
559 // How to have only one function "AddHitsForRecFromGEANT" ????
560 if (fPrintLevel >= 2)
561 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
562 if (TH == NULL) return;
563 // Loop over tracks in tree
564 Int_t ntracks = (Int_t) TH->GetEntries();
565 if (fPrintLevel >= 2)
566 cout << "ntracks: " << ntracks << endl;
567 for (Int_t track = 0; track < ntracks; track++) {
568 if (Hits) Hits->Clear();
569 TH->GetEvent(track);
570 // Loop over hits
571 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
572 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
573 } // end of hit loop
574 } // end of track loop
575 return;
576}
577
578 //__________________________________________________________________________
579AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
580{
581 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
582 // with hit number "HitNumber" in the track numbered "TrackNumber",
583 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
584 // Selects hits in tracking (not trigger) chambers.
585 // Takes into account the efficiency (fEfficiency)
586 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
587 // Adds a condition on the radius between RMin and RMax
588 // to better simulate the real chambers.
589 // Returns the pointer to the new hit for reconstruction,
590 // or NULL in case of inefficiency or non tracking chamber or bad radius.
591 // No condition on at most 20 cm from a muon from a resonance
592 // like in Fortran TRACKF_STAT.
593 AliMUONHitForRec* hitForRec;
594 Double_t bendCoor, nonBendCoor, radius;
595 Int_t chamber = Hit->fChamber - 1; // chamber(0...)
596 // only in tracking chambers (fChamber starts at 1)
9cbdf048 597 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 598 // only if hit is efficient (keep track for checking ????)
599 if (gRandom->Rndm() > fEfficiency) return NULL;
600 // only if radius between RMin and RMax
94de3818 601 bendCoor = Hit->Y();
602 nonBendCoor = Hit->X();
a9e2aefa 603 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
604 if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
605 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
606 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
607 fNHitsForRec++;
608 // add smearing from resolution
609 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
610 hitForRec->SetNonBendingCoor(nonBendCoor
611 + gRandom->Gaus(0., fNonBendingResolution));
612 // more information into HitForRec
613 // resolution: angular effect to be added here ????
614 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
615 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
616 // GEANT track info
617 hitForRec->SetHitNumber(HitNumber);
618 hitForRec->SetTHTrack(TrackNumber);
619 hitForRec->SetGeantSignal(Signal);
620 if (fPrintLevel >= 10) {
621 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
622 Hit->Dump();
623 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
624 hitForRec->Dump();}
625 return hitForRec;
626}
627
628 //__________________________________________________________________________
629void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
630{
631 // Sort HitsForRec's in increasing order with respect to chamber number.
632 // Uses the function "Compare".
633 // Update the information for HitsForRec per chamber too.
634 Int_t ch, nhits, prevch;
635 fHitsForRecPtr->Sort();
9cbdf048 636 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 637 fNHitsForRecPerChamber[ch] = 0;
638 fIndexOfFirstHitForRecPerChamber[ch] = 0;
639 }
640 prevch = 0; // previous chamber
641 nhits = 0; // number of hits in current chamber
642 // Loop over HitsForRec
643 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
644 // chamber number (0...)
645 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
646 // increment number of hits in current chamber
647 (fNHitsForRecPerChamber[ch])++;
648 // update index of first HitForRec in current chamber
649 // if chamber number different from previous one
650 if (ch != prevch) {
651 fIndexOfFirstHitForRecPerChamber[ch] = hit;
652 prevch = ch;
653 }
654 }
655 return;
656}
657
658// //__________________________________________________________________________
659// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
660// {
661// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
662// // To add to the list of hits for reconstruction
663// // the (cathode correlated) raw clusters
664// // No condition added, like in Fortran TRACKF_STAT,
665// // on the radius between RMin and RMax.
666// AliMUONHitForRec *hitForRec;
667// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
668// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
669// // Security on MUON ????
670// // Loop over tracking chambers
9cbdf048 671// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 672// // number of HitsForRec to 0 for the chamber
673// fNHitsForRecPerChamber[ch] = 0;
674// // index of first HitForRec for the chamber
675// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
676// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
677// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
678// MUON->ResetReconstHits();
679// TC->GetEvent();
680// Int_t ncor = (Int_t)reconst_hits->GetEntries();
681// // Loop over (cathode correlated) raw clusters
682// for (Int_t cor = 0; cor < ncor; cor++) {
683// AliMUONReconstHit * mCor =
684// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
685// // new AliMUONHitForRec from (cathode correlated) raw cluster
686// // and increment number of AliMUONHitForRec's (total and in chamber)
687// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
688// fNHitsForRec++;
689// (fNHitsForRecPerChamber[ch])++;
690// // more information into HitForRec
691// hitForRec->SetChamberNumber(ch);
692// hitForRec->SetHitNumber(cor);
693// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
694// // could (should) be more exact from chamber geometry ????
695// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
696// if (fPrintLevel >= 10) {
697// cout << "chamber (0...): " << ch <<
698// " cathcorrel (0...): " << cor << endl;
699// mCor->Dump();
700// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
701// hitForRec->Dump();}
702// } // end of cluster loop
703// } // end of chamber loop
704// return;
705// }
706
707 //__________________________________________________________________________
708void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
709{
710 // To add to the list of hits for reconstruction all the raw clusters
711 // No condition added, like in Fortran TRACKF_STAT,
712 // on the radius between RMin and RMax.
713 AliMUONHitForRec *hitForRec;
714 AliMUONRawCluster *clus;
715 Int_t iclus, nclus;
716 TClonesArray *rawclusters;
717 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
9cbdf048 718 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 719 // Security on MUON ????
720 // Loop over tracking chambers
9cbdf048 721 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 722 // number of HitsForRec to 0 for the chamber
723 fNHitsForRecPerChamber[ch] = 0;
724 // index of first HitForRec for the chamber
725 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
726 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
9cbdf048 727 rawclusters = pMUON->RawClustAddress(ch);
728 pMUON->ResetRawClusters();
a9e2aefa 729 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
730 nclus = (Int_t) (rawclusters->GetEntries());
731 // Loop over (cathode correlated) raw clusters
732 for (iclus = 0; iclus < nclus; iclus++) {
733 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
734 // new AliMUONHitForRec from raw cluster
735 // and increment number of AliMUONHitForRec's (total and in chamber)
736 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
737 fNHitsForRec++;
738 (fNHitsForRecPerChamber[ch])++;
739 // more information into HitForRec
740 // resolution: info should be already in raw cluster and taken from it ????
741 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
742 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
743 // original raw cluster
744 hitForRec->SetChamberNumber(ch);
745 hitForRec->SetHitNumber(iclus);
ba5b68db 746 // Z coordinate of the raw cluster (cm)
cfe0107f 747 hitForRec->SetZ(clus->fZ[0]);
a9e2aefa 748 if (fPrintLevel >= 10) {
749 cout << "chamber (0...): " << ch <<
750 " raw cluster (0...): " << iclus << endl;
751 clus->Dump();
752 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
753 hitForRec->Dump();}
754 } // end of cluster loop
755 } // end of chamber loop
756 return;
757}
758
759 //__________________________________________________________________________
760void AliMUONEventReconstructor::MakeSegments(void)
761{
762 // To make the list of segments in all stations,
763 // from the list of hits to be reconstructed
764 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
765 ResetSegments();
766 // Loop over stations
9cbdf048 767 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 768 MakeSegmentsPerStation(st);
769 if (fPrintLevel >= 10) {
770 cout << "end of MakeSegments" << endl;
9cbdf048 771 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 772 cout << "station(0...): " << st
773 << " Segments: " << fNSegments[st]
774 << endl;
775 for (Int_t seg = 0;
776 seg < fNSegments[st];
777 seg++) {
778 cout << "Segment index(0...): " << seg << endl;
779 ((*fSegmentsPtr[st])[seg])->Dump();
780 }
781 }
782 }
783 return;
784}
785
786 //__________________________________________________________________________
787void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
788{
789 // To make the list of segments in station number "Station" (0...)
790 // from the list of hits to be reconstructed.
791 // Updates "fNSegments"[Station].
792 // Segments in stations 4 and 5 are sorted
793 // according to increasing absolute value of "impact parameter"
794 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
795 AliMUONSegment *segment;
796 Bool_t last2st;
797 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
ecfa008b 798 impactParam = 0., maxImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 799 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 800 if (fPrintLevel >= 1)
801 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
802 // first and second chambers (0...) in the station
803 Int_t ch1 = 2 * Station;
804 Int_t ch2 = ch1 + 1;
805 // variable true for stations downstream of the dipole:
806 // Station(0..4) equal to 3 or 4
807 if ((Station == 3) || (Station == 4)) {
808 last2st = kTRUE;
809 // maximum impact parameter (cm) according to fMinBendingMomentum...
810 maxImpactParam =
811 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
812 }
813 else last2st = kFALSE;
814 // extrapolation factor from Z of first chamber to Z of second chamber
815 // dZ to be changed to take into account fine structure of chambers ????
816 Double_t extrapFact =
9cbdf048 817 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 818 // index for current segment
819 Int_t segmentIndex = 0;
820 // Loop over HitsForRec in the first chamber of the station
821 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
822 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
823 hit1++) {
824 // pointer to the HitForRec
825 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
826 // extrapolation,
827 // on the straight line joining the HitForRec to the vertex (0,0,0),
828 // to the Z of the second chamber of the station
829 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
830 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
831 // Loop over HitsForRec in the second chamber of the station
832 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
833 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
834 hit2++) {
835 // pointer to the HitForRec
836 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
837 // absolute values of distances, in bending and non bending planes,
838 // between the HitForRec in the second chamber
839 // and the previous extrapolation
840 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
841 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
842 if (last2st) {
843 // bending slope
844 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
845 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
846 // absolute value of impact parameter
847 impactParam =
848 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
849 }
850 // check for distances not too large,
851 // and impact parameter not too big if stations downstream of the dipole.
852 // Conditions "distBend" and "impactParam" correlated for these stations ????
853 if ((distBend < fSegmentMaxDistBending[Station]) &&
854 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
855 (!last2st || (impactParam < maxImpactParam))) {
856 // make new segment
857 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
858 AliMUONSegment(hit1Ptr, hit2Ptr);
859 // update "link" to this segment from the hit in the first chamber
860 if (hit1Ptr->GetNSegments() == 0)
861 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
862 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
863 if (fPrintLevel >= 10) {
864 cout << "segmentIndex(0...): " << segmentIndex
865 << " distBend: " << distBend
866 << " distNonBend: " << distNonBend
867 << endl;
868 segment->Dump();
869 cout << "HitForRec in first chamber" << endl;
870 hit1Ptr->Dump();
871 cout << "HitForRec in second chamber" << endl;
872 hit2Ptr->Dump();
873 };
874 // increment index for current segment
875 segmentIndex++;
876 }
877 } //for (Int_t hit2
878 } // for (Int_t hit1...
879 fNSegments[Station] = segmentIndex;
880 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
881 // i.e. Station(0..4) 3 or 4, using the function "Compare".
882 // After this sorting, it is impossible to use
883 // the "fNSegments" and "fIndexOfFirstSegment"
884 // of the HitForRec in the first chamber to explore all segments formed with it.
885 // Is this sorting really needed ????
886 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
887 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
888 << fNSegments[Station] << endl;
889 return;
890}
891
892 //__________________________________________________________________________
893void AliMUONEventReconstructor::MakeTracks(void)
894{
895 // To make the tracks,
896 // from the list of segments and points in all stations
897 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 898 // The order may be important for the following Reset's
a9e2aefa 899 ResetTracks();
8429a5e4 900 ResetTrackHits();
a9e2aefa 901 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
902 MakeTrackCandidates();
903 // Follow tracks in stations(1..) 3, 2 and 1
904 FollowTracks();
8429a5e4 905 // Remove double tracks
906 RemoveDoubleTracks();
a9e2aefa 907 return;
908}
909
910 //__________________________________________________________________________
911Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
912{
913 // To make track candidates with two segments in stations(1..) 4 and 5,
914 // the first segment being pointed to by "BegSegment".
915 // Returns the number of such track candidates.
916 Int_t endStation, iEndSegment, nbCan2Seg;
917 AliMUONSegment *endSegment, *extrapSegment;
918 AliMUONTrack *recTrack;
919 Double_t mcsFactor;
920 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
921 // Station for the end segment
922 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
923 // multiple scattering factor corresponding to one chamber
924 mcsFactor = 0.0136 /
925 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
926 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
927 // linear extrapolation to end station
928 extrapSegment =
929 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
930 // number of candidates with 2 segments to 0
931 nbCan2Seg = 0;
932 // Loop over segments in the end station
933 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
934 // pointer to segment
935 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
936 // test compatibility between current segment and "extrapSegment"
04b5ea16 937 // 4 because 4 quantities in chi2
a9e2aefa 938 if ((endSegment->
939 NormalizedChi2WithSegment(extrapSegment,
940 fMaxSigma2Distance)) <= 4.0) {
941 // both segments compatible:
942 // make track candidate from "begSegment" and "endSegment"
943 if (fPrintLevel >= 2)
944 cout << "TrackCandidate with Segment " << iEndSegment <<
945 " in Station(0..) " << endStation << endl;
946 // flag for both segments in one track:
947 // to be done in track constructor ????
948 BegSegment->SetInTrack(kTRUE);
949 endSegment->SetInTrack(kTRUE);
950 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
951 AliMUONTrack(BegSegment, endSegment, this);
952 fNRecTracks++;
953 if (fPrintLevel >= 10) recTrack->RecursiveDump();
954 // increment number of track candidates with 2 segments
955 nbCan2Seg++;
956 }
957 } // for (iEndSegment = 0;...
958 delete extrapSegment; // should not delete HitForRec's it points to !!!!
959 return nbCan2Seg;
960}
961
962 //__________________________________________________________________________
963Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
964{
965 // To make track candidates with one segment and one point
966 // in stations(1..) 4 and 5,
967 // the segment being pointed to by "BegSegment".
968 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
969 AliMUONHitForRec *extrapHitForRec, *hit;
970 AliMUONTrack *recTrack;
971 Double_t mcsFactor;
972 if (fPrintLevel >= 1)
973 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
974 // station for the end point
975 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
976 // multiple scattering factor corresponding to one chamber
977 mcsFactor = 0.0136 /
978 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
979 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
980 // first and second chambers(0..) in the end station
981 ch1 = 2 * endStation;
982 ch2 = ch1 + 1;
983 // number of candidates to 0
984 nbCan1Seg1Hit = 0;
985 // Loop over chambers of the end station
986 for (ch = ch2; ch >= ch1; ch--) {
987 // linear extrapolation to chamber
988 extrapHitForRec =
989 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
990 // limits for the hit index in the loop
991 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
992 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
993 // Loop over HitForRec's in the chamber
994 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
995 // pointer to HitForRec
996 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
997 // test compatibility between current HitForRec and "extrapHitForRec"
04b5ea16 998 // 2 because 2 quantities in chi2
a9e2aefa 999 if ((hit->
1000 NormalizedChi2WithHitForRec(extrapHitForRec,
1001 fMaxSigma2Distance)) <= 2.0) {
1002 // both HitForRec's compatible:
1003 // make track candidate from begSegment and current HitForRec
1004 if (fPrintLevel >= 2)
1005 cout << "TrackCandidate with HitForRec " << iHit <<
1006 " in Chamber(0..) " << ch << endl;
1007 // flag for beginning segments in one track:
1008 // to be done in track constructor ????
1009 BegSegment->SetInTrack(kTRUE);
1010 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1011 AliMUONTrack(BegSegment, hit, this);
1012 // the right place to eliminate "double counting" ???? how ????
1013 fNRecTracks++;
1014 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1015 // increment number of track candidates
1016 nbCan1Seg1Hit++;
1017 }
1018 } // for (iHit = iHitMin;...
1019 delete extrapHitForRec;
1020 } // for (ch = ch2;...
1021 return nbCan1Seg1Hit;
1022}
1023
1024 //__________________________________________________________________________
1025void AliMUONEventReconstructor::MakeTrackCandidates(void)
1026{
1027 // To make track candidates
1028 // with at least 3 aligned points in stations(1..) 4 and 5
1029 // (two Segment's or one Segment and one HitForRec)
1030 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1031 AliMUONSegment *begSegment;
1032 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1033 // Loop over stations(1..) 5 and 4 for the beginning segment
1034 for (begStation = 4; begStation > 2; begStation--) {
1035 // Loop over segments in the beginning station
1036 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1037 // pointer to segment
1038 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1039 if (fPrintLevel >= 2)
1040 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1041 " in Station(0..) " << begStation << endl;
1042 // Look for track candidates with two segments,
1043 // "begSegment" and all compatible segments in other station.
1044 // Only for beginning station(1..) 5
1045 // because candidates with 2 segments have to looked for only once.
1046 if (begStation == 4)
1047 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
956019b6 1048 // Look for track candidates with one segment and one point,
a9e2aefa 1049 // "begSegment" and all compatible HitForRec's in other station.
1050 // Only if "begSegment" does not belong already to a track candidate.
1051 // Is that a too strong condition ????
1052 if (!(begSegment->GetInTrack()))
1053 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1054 } // for (iBegSegment = 0;...
1055 } // for (begStation = 4;...
1056 return;
1057}
1058
1059 //__________________________________________________________________________
1060void AliMUONEventReconstructor::FollowTracks(void)
1061{
1062 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1063 // too long: should be made more modular !!!!
a9e2aefa 1064 AliMUONHitForRec *bestHit, *extrapHit, *hit;
1065 AliMUONSegment *bestSegment, *extrapSegment, *segment;
04b5ea16 1066 AliMUONTrack *track, *nextTrack;
1067 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1068 // -1 to avoid compilation warnings
1069 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1070 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
9cbdf048 1071 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1072 // local maxSigma2Distance, for easy increase in testing
1073 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1074 if (fPrintLevel >= 2)
1075 cout << "enter FollowTracks" << endl;
1076 // Loop over track candidates
04b5ea16 1077 track = (AliMUONTrack*) fRecTracksPtr->First();
1078 trackIndex = -1;
1079 while (track) {
1080 // Follow function for each track candidate ????
1081 trackIndex++;
1082 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1083 if (fPrintLevel >= 2)
1084 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 1085 // Fit track candidate
1086 track->SetFitMCS(0); // without multiple Coulomb scattering
1087 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1088 track->SetFitStart(0); // from parameters at vertex
1089 track->Fit();
a9e2aefa 1090 if (fPrintLevel >= 10) {
1091 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1092 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1093 track->RecursiveDump();
1094 }
1095 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1096 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1097 // otherwise: majority coincidence 2 !!!!
a9e2aefa 1098 for (station = 2; station >= 0; station--) {
1099 // Track parameters at first track hit (smallest Z)
1100 trackParam1 = ((AliMUONTrackHit*)
1101 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1102 // extrapolation to station
1103 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 1104 extrapSegment = new AliMUONSegment(); // empty segment
a9e2aefa 1105 // multiple scattering factor corresponding to one chamber
1106 // and momentum in bending plane (not total)
1107 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1108 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1109 // Z difference from previous station
9cbdf048 1110 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1111 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1112 // Z difference between the two previous stations
9cbdf048 1113 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1114 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 1115 // Z difference between the two chambers in the previous station
1116 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1117 (&(pMUON->Chamber(2 * station + 1)))->Z();
1118 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1119 extrapSegment->
1120 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1121 extrapSegment->UpdateFromStationTrackParam
1122 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1123 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1124 bestChi2 = 5.0;
1125 bestSegment = NULL;
1126 if (fPrintLevel >= 10) {
1127 cout << "FollowTracks: track candidate(0..): " << trackIndex
1128 << " Look for segment in station(0..): " << station << endl;
1129 }
1130 // Loop over segments in station
1131 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1132 // Look for best compatible Segment in station
1133 // should consider all possibilities ????
1134 // multiple scattering ????
1135 // separation in 2 functions: Segment and HitForRec ????
1136 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1137 chi2 = segment->NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1138 if (chi2 < bestChi2) {
1139 // update best Chi2 and Segment if better found
1140 bestSegment = segment;
1141 bestChi2 = chi2;
1142 }
1143 }
1144 if (bestSegment) {
1145 // best segment found: add it to track candidate
1146 track->AddSegment(bestSegment);
1147 // set track parameters at these two TrakHit's
1148 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1149 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1150 if (fPrintLevel >= 10) {
1151 cout << "FollowTracks: track candidate(0..): " << trackIndex
1152 << " Added segment in station(0..): " << station << endl;
1153 track->RecursiveDump();
1154 }
1155 }
1156 else {
1157 // No best segment found:
1158 // Look for best compatible HitForRec in station:
1159 // should consider all possibilities ????
1160 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1161 extrapHit = new AliMUONHitForRec(); // empty hit
a9e2aefa 1162 bestChi2 = 3.0;
1163 bestHit = NULL;
1164 if (fPrintLevel >= 10) {
1165 cout << "FollowTracks: track candidate(0..): " << trackIndex
1166 << " Segment not found, look for hit in station(0..): " << station
1167 << endl;
1168 }
1169 // Loop over chambers of the station
d82671a0 1170 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1171 // coordinates of extrapolated hit
d82671a0 1172 extrapHit->
1173 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1174 extrapHit->
1175 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1176 // resolutions from "extrapSegment"
1177 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1178 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1179 // Loop over hits in the chamber
956019b6 1180 ch = 2 * station + chInStation;
a9e2aefa 1181 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1182 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1183 fNHitsForRecPerChamber[ch];
1184 iHit++) {
1185 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1186 // condition for hit not already in segment ????
1187 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1188 if (chi2 < bestChi2) {
1189 // update best Chi2 and HitForRec if better found
1190 bestHit = hit;
1191 bestChi2 = chi2;
d82671a0 1192 chBestHit = chInStation;
a9e2aefa 1193 }
1194 }
1195 }
1196 if (bestHit) {
1197 // best hit found: add it to track candidate
1198 track->AddHitForRec(bestHit);
956019b6 1199 // set track parameters at this TrackHit
a9e2aefa 1200 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1201 &(trackParam[chBestHit]));
1202 if (fPrintLevel >= 10) {
1203 cout << "FollowTracks: track candidate(0..): " << trackIndex
1204 << " Added hit in station(0..): " << station << endl;
1205 track->RecursiveDump();
1206 }
1207 }
1208 else {
8429a5e4 1209 // Remove current track candidate
1210 // and corresponding TrackHit's, ...
1211 track->Remove();
04b5ea16 1212 delete extrapSegment;
a9e2aefa 1213 break; // stop the search for this candidate:
1214 // exit from the loop over station
1215 }
1216 }
04b5ea16 1217 delete extrapSegment;
a9e2aefa 1218 // Sort track hits according to increasing Z
1219 track->GetTrackHitsPtr()->Sort();
1220 // Update track parameters at first track hit (smallest Z)
1221 trackParam1 = ((AliMUONTrackHit*)
1222 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
956019b6 1223 // Track fit
04b5ea16 1224 // with multiple Coulomb scattering if all stations
1225 if (station == 0) track->SetFitMCS(1);
956019b6 1226 // without multiple Coulomb scattering if not all stations
04b5ea16 1227 else track->SetFitMCS(0);
956019b6 1228 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1229 track->SetFitStart(1); // from parameters at first hit
1230 track->Fit();
a9e2aefa 1231 if (fPrintLevel >= 10) {
1232 cout << "FollowTracks: track candidate(0..): " << trackIndex
1233 << " after fit from station(0..): " << station << " to 4" << endl;
1234 track->RecursiveDump();
1235 }
04b5ea16 1236 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1237 // after going through the first station
04b5ea16 1238 if (station == 0) {
1239 trackParamVertex = *trackParam1;
1240 (&trackParamVertex)->ExtrapToVertex();
1241 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1242 if (fPrintLevel >= 1) {
1243 cout << "FollowTracks: track candidate(0..): " << trackIndex
1244 << " after extrapolation to vertex" << endl;
1245 track->RecursiveDump();
1246 }
04b5ea16 1247 }
a9e2aefa 1248 } // for (station = 2;...
04b5ea16 1249 // go really to next track
1250 track = nextTrack;
1251 } // while (track)
1252 // Compression of track array (necessary after Remove ????)
1253 fRecTracksPtr->Compress();
1254 return;
1255}
1256
1257 //__________________________________________________________________________
8429a5e4 1258void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1259{
1260 // To remove double tracks.
1261 // Tracks are considered identical
1262 // if they have at least half of their hits in common.
1263 // Among two identical tracks, one keeps the track with the larger number of hits
1264 // or, if these numbers are equal, the track with the minimum Chi2.
1265 AliMUONTrack *track1, *track2, *trackToRemove;
1266 Bool_t identicalTracks;
1267 Int_t hitsInCommon, nHits1, nHits2;
1268 identicalTracks = kTRUE;
1269 while (identicalTracks) {
1270 identicalTracks = kFALSE;
1271 // Loop over first track of the pair
1272 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1273 while (track1 && (!identicalTracks)) {
1274 nHits1 = track1->GetNTrackHits();
1275 // Loop over second track of the pair
1276 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1277 while (track2 && (!identicalTracks)) {
1278 nHits2 = track2->GetNTrackHits();
1279 // number of hits in common between two tracks
1280 hitsInCommon = track1->HitsInCommon(track2);
1281 // check for identical tracks
1282 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1283 identicalTracks = kTRUE;
1284 // decide which track to remove
1285 if (nHits1 > nHits2) trackToRemove = track2;
1286 else if (nHits1 < nHits2) trackToRemove = track1;
1287 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1288 trackToRemove = track2;
1289 else trackToRemove = track1;
1290 // remove it
1291 trackToRemove->Remove();
1292 }
1293 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1294 } // track2
1295 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1296 } // track1
1297 }
1298 return;
1299}
1300
1301 //__________________________________________________________________________
04b5ea16 1302void AliMUONEventReconstructor::EventDump(void)
1303{
1304 // Dump reconstructed event (track parameters at vertex and at first hit),
1305 // and the particle parameters
1306
1307 AliMUONTrack *track;
1308 AliMUONTrackParam *trackParam, *trackParam1;
1309 TClonesArray *particles; // pointer to the particle list
1310 TParticle *p;
1311 Double_t bendingSlope, nonBendingSlope, pYZ;
1312 Double_t pX, pY, pZ, x, y, z, c;
1313 Int_t np, trackIndex, nTrackHits;
1314
1315 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1316 if (fPrintLevel >= 1) {
1317 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1318 }
1319 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1320 // Loop over reconstructed tracks
1321 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1322 if (fPrintLevel >= 1)
1323 cout << " track number: " << trackIndex << endl;
1324 // function for each track for modularity ????
1325 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1326 nTrackHits = track->GetNTrackHits();
1327 if (fPrintLevel >= 1)
1328 cout << " number of track hits: " << nTrackHits << endl;
1329 // track parameters at Vertex
1330 trackParam = track->GetTrackParamAtVertex();
1331 x = trackParam->GetNonBendingCoor();
1332 y = trackParam->GetBendingCoor();
1333 z = trackParam->GetZ();
1334 bendingSlope = trackParam->GetBendingSlope();
1335 nonBendingSlope = trackParam->GetNonBendingSlope();
1336 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1337 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1338 pX = pZ * nonBendingSlope;
1339 pY = pZ * bendingSlope;
1340 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1341 if (fPrintLevel >= 1)
1342 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1343 z, x, y, pX, pY, pZ, c);
1344
1345 // track parameters at first hit
1346 trackParam1 = ((AliMUONTrackHit*)
1347 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1348 x = trackParam1->GetNonBendingCoor();
1349 y = trackParam1->GetBendingCoor();
1350 z = trackParam1->GetZ();
1351 bendingSlope = trackParam1->GetBendingSlope();
1352 nonBendingSlope = trackParam1->GetNonBendingSlope();
1353 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1354 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1355 pX = pZ * nonBendingSlope;
1356 pY = pZ * bendingSlope;
1357 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1358 if (fPrintLevel >= 1)
1359 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1360 z, x, y, pX, pY, pZ, c);
1361 }
1362 // informations about generated particles
1363 particles = gAlice->Particles();
1364 np = particles->GetEntriesFast();
1365 printf(" **** number of generated particles: %d \n", np);
1366
1367 for (Int_t iPart = 0; iPart < np; iPart++) {
1368 p = (TParticle*) particles->UncheckedAt(iPart);
1369 printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1370 iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1371 }
a9e2aefa 1372 return;
1373}
1374
c7ba256d 1375void AliMUONEventReconstructor::FillEvent()
1376{
1377// Create a new AliMUONRecoEvent, fill its track list, then add it as a
1378// leaf in the Event branch of TreeRecoEvent tree
1379 cout << "Enter FillEvent() ...\n";
1380
1381 if (!fRecoEvent) {
1382 fRecoEvent = new AliMUONRecoEvent();
1383 } else {
1384 fRecoEvent->Clear();
1385 }
1386 //save current directory
1387 TDirectory *current = gDirectory;
1388 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1389 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1390 if (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1391 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1392 TBranch *branch = fEventTree->GetBranch("Event");
1393 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000,1);
1394 branch->SetAutoDelete();
1395 fTreeFile->cd();
1396 fEventTree->Fill();
1397 fTreeFile->Write();
1398 }
1399 // restore directory
1400 current->cd();
1401}