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To remove problem in running RuleChecker, like in MUON-dev
[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$Log$
79e1e601 18Revision 1.1.2.5 2000/06/16 07:00:26 gosset
19To remove problem in running RuleChecker
20
a9e2aefa 21Revision 1.1.2.4 2000/06/12 08:00:07 morsch
22Dummy streamer to solve CINT compilation problem (to be investigated !)
23
24Revision 1.1.2.3 2000/06/09 20:59:57 morsch
25Make includes consistent with new file structure.
26
27Revision 1.1.2.2 2000/06/09 12:58:05 gosset
28Removed comment beginnings in Log sections of .cxx files
29Suppressed most violations of coding rules
30
31Revision 1.1.2.1 2000/06/07 14:44:53 gosset
32Addition of files for track reconstruction in C++
33*/
34
35//__________________________________________________________________________
36//
37// MUON event reconstructor in ALICE
38//
39// This class contains as data:
40// * the parameters for the event reconstruction
41// * a pointer to the array of hits to be reconstructed (the event)
42// * a pointer to the array of segments made with these hits inside each station
43// * a pointer to the array of reconstructed tracks
44//
45// It contains as methods, among others:
46// * MakeEventToBeReconstructed to build the array of hits to be reconstructed
47// * MakeSegments to build the segments
48// * MakeTracks to build the tracks
49//__________________________________________________________________________
50
51#include <iostream.h>
52
53#include <TRandom.h>
54#include <TFile.h>
55
56#include "AliCallf77.h"
57#include "AliMUONEventReconstructor.h"
58#include "AliMUON.h"
59#include "AliMUONHitForRec.h"
60#include "AliMUONSegment.h"
61#include "AliMUONHit.h"
62#include "AliMUONRawCluster.h"
63#include "AliMUONTrack.h"
64#include "AliMUONChamber.h"
65#include "AliMUONTrackHit.h"
66#include "AliRun.h"
67
68#ifndef WIN32
69# define initfield initfield_
70# define reco_gufld reco_gufld_
71#else
72# define initfield INITFIELD
73# define reco_gufld RECO_GUFLD
74#endif
75
76extern "C"
77{
78void type_of_call initfield();
79void type_of_call reco_gufld(Double_t *Coor, Double_t *Field);
80}
81
82//************* Defaults parameters for reconstruction
83static const Double_t DefaultMinBendingMomentum = 3.0;
84static const Double_t DefaultMaxSigma2Distance = 16.0;
85static const Double_t DefaultBendingResolution = 0.01;
86static const Double_t DefaultNonBendingResolution = 0.144;
87static const Double_t DefaultChamberThicknessInX0 = 0.03;
88// Simple magnetic field:
89// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
90// Length and Position from reco_muon.F, with opposite sign:
91// Length = ZMAGEND-ZCOIL
92// Position = (ZMAGEND+ZCOIL)/2
93// to be ajusted differently from real magnetic field ????
94static const Double_t DefaultSimpleBValue = 7.0;
95static const Double_t DefaultSimpleBLength = 428.0;
96static const Double_t DefaultSimpleBPosition = 1019.0;
97static const Int_t DefaultRecGeantHits = 0;
98static const Double_t DefaultEfficiency = 0.95;
99
100static const Int_t DefaultPrintLevel = 0;
101
102ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
103
104 //__________________________________________________________________________
105AliMUONEventReconstructor::AliMUONEventReconstructor(void)
106{
107 // Constructor for class AliMUONEventReconstructor
108 SetReconstructionParametersToDefaults();
109 // Memory allocation for the TClonesArray of hits for reconstruction
110 // Is 10000 the right size ????
111 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
112 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
113 // Memory allocation for the TClonesArray's of segments in stations
114 // Is 2000 the right size ????
115 for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) {
116 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
117 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
118 }
119 // Memory allocation for the TClonesArray of reconstructed tracks
120 // Is 10 the right size ????
121 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
122 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
123
124 // Initialize magnetic field
125 // using Fortran subroutine INITFIELD in "reco_muon.F".
126 // Should rather use AliMagF ???? and remove prototyping ...
127 initfield();
128 // Impression de quelques valeurs
129 Double_t coor[3], field[3];
130 coor[0] = 50.0;
131 coor[1] = 50.0;
132 coor[2] = 950.0;
133 reco_gufld(coor, field);
134 cout << "coor: " << coor[0] << ", " << coor[1] << ", " << coor[2] << endl;
135 cout << "field: " << field[0] << ", " << field[1] << ", " << field[2] << endl;
136 coor[2] = -950.0;
137 reco_gufld(coor, field);
138 cout << "coor: " << coor[0] << ", " << coor[1] << ", " << coor[2] << endl;
139 cout << "field: " << field[0] << ", " << field[1] << ", " << field[2] << endl;
140 coor[2] = -950.0;
141
142 if (fPrintLevel >= 0) {
143 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();}
144 return;
145}
146
147 //__________________________________________________________________________
148AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
149{
150 // Destructor for class AliMUONEventReconstructor
151 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
152 for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++)
153 delete fSegmentsPtr[st]; // Correct destruction of everything ????
154 return;
155}
156
157 //__________________________________________________________________________
158void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
159{
160 // Set reconstruction parameters to default values
161 // Would be much more convenient with a structure (or class) ????
162 fMinBendingMomentum = DefaultMinBendingMomentum;
163 fMaxSigma2Distance = DefaultMaxSigma2Distance;
164
165 AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON");
166 // ******** Parameters for making HitsForRec
167 // minimum radius,
168 // like in TRACKF_STAT:
169 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
170 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
171 for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) {
172 if (ch < 4) fRMin[ch] = TMath::Abs((&(MUON->Chamber(ch)))->Z()) *
173 2.0 * TMath::Pi() / 180.0;
174 else fRMin[ch] = 30.0;
175 }
176 // maximum radius
177 // like in TRACKF_STAT (10 degrees ????)
178 fRMax[0] = fRMax[1] = 91.5;
179 fRMax[2] = fRMax[3] = 122.5;
180 fRMax[4] = fRMax[5] = 158.3;
181 fRMax[6] = fRMax[7] = 260.0;
182 fRMax[8] = fRMax[9] = 260.0;
183
184 // ******** Parameters for making segments
185 // should be parametrized ????
186 // according to interval between chambers in a station ????
187 // Maximum distance in non bending plane
188 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
189 // SIGCUT*DYMAX(IZ)
190 for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++)
191 fSegmentMaxDistNonBending[st] = 5. * 0.22;
192 // Maximum distance in bending plane
193 // values from TRACKF_STAT corresponding to (J psi 20cm)
194 fSegmentMaxDistBending[0] = 1.5;
195 fSegmentMaxDistBending[1] = 1.5;
196 fSegmentMaxDistBending[2] = 3.0;
197 fSegmentMaxDistBending[3] = 6.0;
198 fSegmentMaxDistBending[4] = 6.0;
199
200 fBendingResolution = DefaultBendingResolution;
201 fNonBendingResolution = DefaultNonBendingResolution;
202 fChamberThicknessInX0 = DefaultChamberThicknessInX0;
203 fSimpleBValue = DefaultSimpleBValue;
204 fSimpleBLength = DefaultSimpleBLength;
205 fSimpleBPosition = DefaultSimpleBPosition;
206 fRecGeantHits = DefaultRecGeantHits;
207 fEfficiency = DefaultEfficiency;
208 fPrintLevel = DefaultPrintLevel;
209 return;
210}
211
212//__________________________________________________________________________
213Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum)
214{
215 // Returns impact parameter at vertex in bending plane (cm),
216 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
217 // using simple values for dipole magnetic field.
218 // The sign is the sign of the charge.
219 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
220 BendingMomentum);
221}
222
223//__________________________________________________________________________
224Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam)
225{
226 // Returns signed bending momentum in bending plane (GeV/c),
227 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
228 // using simple values for dipole magnetic field.
229 // The sign is the sign of the charge.
230 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
231 ImpactParam);
232}
233
234//__________________________________________________________________________
235void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
236{
237 // Set background file ... for GEANT hits
238 // Must be called after having loaded the firts signal event
239 if (fPrintLevel >= 0) {
240 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
241 << BkgGeantFileName << "''" << endl;}
242 if (strlen(BkgGeantFileName)) {
243 // BkgGeantFileName not empty: try to open the file
244 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
245 fBkgGeantFile = new TFile(BkgGeantFileName);
246 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
247 if (fBkgGeantFile-> IsOpen()) {
248 if (fPrintLevel >= 0) {
249 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
250 << "'' successfully opened" << endl;}
251 }
252 else {
253 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
254 cout << "NOT FOUND: EXIT" << endl;
255 exit(0); // right instruction for exit ????
256 }
257 // Arrays for "particles" and "hits"
258 fBkgGeantParticles = new TClonesArray("TParticle", 200);
259 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
260 // Event number to -1 for initialization
261 fBkgGeantEventNumber = -1;
262 // Back to the signal file:
263 // first signal event must have been loaded previously,
264 // otherwise, Segmentation violation at the next instruction
265 // How is it possible to do smething better ????
266 ((gAlice->TreeK())->GetCurrentFile())->cd();
267 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
268 }
269 return;
270}
271
272//__________________________________________________________________________
273void AliMUONEventReconstructor::NextBkgGeantEvent(void)
274{
275 // Get next event in background file for GEANT hits
276 // Goes back to event number 0 when end of file is reached
277 char treeName[20];
278 TBranch *branch;
279 if (fPrintLevel >= 0) {
280 cout << "Enter NextBkgGeantEvent" << endl;}
281 // Clean previous event
282 if(fBkgGeantTK) delete fBkgGeantTK;
283 fBkgGeantTK = NULL;
284 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
285 if(fBkgGeantTH) delete fBkgGeantTH;
286 fBkgGeantTH = NULL;
287 if(fBkgGeantHits) fBkgGeantHits->Clear();
288 // Increment event number
289 fBkgGeantEventNumber++;
290 // Get access to Particles and Hits for event from background file
291 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
292 fBkgGeantFile->cd();
293 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
294 // Particles: TreeK for event and branch "Particles"
295 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
296 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
297 if (!fBkgGeantTK) {
298 if (fPrintLevel >= 0) {
299 cout << "Cannot find Kine Tree for background event: " <<
300 fBkgGeantEventNumber << endl;
301 cout << "Goes back to event 0" << endl;
302 }
303 fBkgGeantEventNumber = 0;
304 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
305 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
306 if (!fBkgGeantTK) {
307 cout << "ERROR: cannot find Kine Tree for background event: " <<
308 fBkgGeantEventNumber << endl;
309 exit(0);
310 }
311 }
312 if (fBkgGeantTK)
313 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
314 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
315 // Hits: TreeH for event and branch "MUON"
316 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
317 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
318 if (!fBkgGeantTH) {
319 cout << "ERROR: cannot find Hits Tree for background event: " <<
320 fBkgGeantEventNumber << endl;
321 exit(0);
322 }
323 if (fBkgGeantTH && fBkgGeantHits) {
324 branch = fBkgGeantTH->GetBranch("MUON");
325 if (branch) branch->SetAddress(&fBkgGeantHits);
326 }
327 fBkgGeantTH->GetEntries(); // necessary ????
328 // Back to the signal file
329 ((gAlice->TreeK())->GetCurrentFile())->cd();
330 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
331 return;
332}
333
334//__________________________________________________________________________
335void AliMUONEventReconstructor::EventReconstruct(void)
336{
337 // To reconstruct one event
338 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
339 MakeEventToBeReconstructed();
340 MakeSegments();
341 MakeTracks();
342 return;
343}
344
345 //__________________________________________________________________________
346void AliMUONEventReconstructor::ResetHitsForRec(void)
347{
348 // To reset the array and the number of HitsForRec,
349 // and also the number of HitsForRec
350 // and the index of the first HitForRec per chamber
351 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
352 fNHitsForRec = 0;
353 for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++)
354 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
355 return;
356}
357
358 //__________________________________________________________________________
359void AliMUONEventReconstructor::ResetSegments(void)
360{
361 // To reset the TClonesArray of segments and the number of Segments
362 // for all stations
363 for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) {
364 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
365 fNSegments[st] = 0;
366 }
367 return;
368}
369
370 //__________________________________________________________________________
371void AliMUONEventReconstructor::ResetTracks(void)
372{
373 // To reset the TClonesArray of reconstructed tracks
374 if (fRecTracksPtr) fRecTracksPtr->Clear();
375 fNRecTracks = 0;
376 return;
377}
378
379 //__________________________________________________________________________
380void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
381{
382 // To make the list of hits to be reconstructed,
383 // either from the GEANT hits or from the raw clusters
384 // according to the parameter set for the reconstructor
385 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
386 ResetHitsForRec();
387 if (fRecGeantHits == 1) {
388 // Reconstruction from GEANT hits
389 // Back to the signal file
390 ((gAlice->TreeK())->GetCurrentFile())->cd();
391 // Signal hits
392 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
393 // Security on MUON ????
394 AddHitsForRecFromGEANT(gAlice->TreeH());
395 // Background hits
396 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
397 // Sort HitsForRec in increasing order with respect to chamber number
398 SortHitsForRecWithIncreasingChamber();
399 }
400 else {
401 // Reconstruction from raw clusters
402 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
403 // Security on MUON ????
404 // TreeR assumed to be be "prepared" in calling function
405 // by "MUON->GetTreeR(nev)" ????
406 TTree *TR = gAlice->TreeR();
407 AddHitsForRecFromRawClusters(TR);
408 // No sorting: it is done automatically in the previous function
409 }
410 if (fPrintLevel >= 10) {
411 cout << "end of MakeEventToBeReconstructed" << endl;
412 cout << "NHitsForRec: " << fNHitsForRec << endl;
413 for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) {
414 cout << "chamber(0...): " << ch
415 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
416 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
417 << endl;
418 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
419 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
420 hit++) {
421 cout << "HitForRec index(0...): " << hit << endl;
422 ((*fHitsForRecPtr)[hit])->Dump();
423 }
424 }
425 }
426 return;
427}
428
429 //__________________________________________________________________________
430void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
431{
432 // To add to the list of hits for reconstruction
433 // the GEANT signal hits from a hit tree TH.
434 if (fPrintLevel >= 2)
435 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
436 if (TH == NULL) return;
437 AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
438 // Security on MUON ????
439 // See whether it could be the same for signal and background ????
440 // Loop over tracks in tree
441 Int_t ntracks = (Int_t) TH->GetEntries();
442 if (fPrintLevel >= 2)
443 cout << "ntracks: " << ntracks << endl;
444 for (Int_t track = 0; track < ntracks; track++) {
445 gAlice->ResetHits();
446 TH->GetEvent(track);
447 // Loop over hits
448 Int_t hit = 0;
449 for (AliMUONHit* mHit = (AliMUONHit*) MUON->FirstHit(-1);
450 mHit;
451 mHit = (AliMUONHit*) MUON->NextHit(), hit++) {
452 NewHitForRecFromGEANT(mHit,track, hit, 1);
453 } // end of hit loop
454 } // end of track loop
455 return;
456}
457
458 //__________________________________________________________________________
459void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
460{
461 // To add to the list of hits for reconstruction
462 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
463 // How to have only one function "AddHitsForRecFromGEANT" ????
464 if (fPrintLevel >= 2)
465 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
466 if (TH == NULL) return;
467 // Loop over tracks in tree
468 Int_t ntracks = (Int_t) TH->GetEntries();
469 if (fPrintLevel >= 2)
470 cout << "ntracks: " << ntracks << endl;
471 for (Int_t track = 0; track < ntracks; track++) {
472 if (Hits) Hits->Clear();
473 TH->GetEvent(track);
474 // Loop over hits
475 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
476 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
477 } // end of hit loop
478 } // end of track loop
479 return;
480}
481
482 //__________________________________________________________________________
483AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
484{
485 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
486 // with hit number "HitNumber" in the track numbered "TrackNumber",
487 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
488 // Selects hits in tracking (not trigger) chambers.
489 // Takes into account the efficiency (fEfficiency)
490 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
491 // Adds a condition on the radius between RMin and RMax
492 // to better simulate the real chambers.
493 // Returns the pointer to the new hit for reconstruction,
494 // or NULL in case of inefficiency or non tracking chamber or bad radius.
495 // No condition on at most 20 cm from a muon from a resonance
496 // like in Fortran TRACKF_STAT.
497 AliMUONHitForRec* hitForRec;
498 Double_t bendCoor, nonBendCoor, radius;
499 Int_t chamber = Hit->fChamber - 1; // chamber(0...)
500 // only in tracking chambers (fChamber starts at 1)
501 if (chamber >= MAX_MUON_TRACKING_CHAMBERS) return NULL;
502 // only if hit is efficient (keep track for checking ????)
503 if (gRandom->Rndm() > fEfficiency) return NULL;
504 // only if radius between RMin and RMax
505 bendCoor = Hit->fY;
506 nonBendCoor = Hit->fX;
507 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
508 if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
509 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
510 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
511 fNHitsForRec++;
512 // add smearing from resolution
513 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
514 hitForRec->SetNonBendingCoor(nonBendCoor
515 + gRandom->Gaus(0., fNonBendingResolution));
516 // more information into HitForRec
517 // resolution: angular effect to be added here ????
518 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
519 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
520 // GEANT track info
521 hitForRec->SetHitNumber(HitNumber);
522 hitForRec->SetTHTrack(TrackNumber);
523 hitForRec->SetGeantSignal(Signal);
524 if (fPrintLevel >= 10) {
525 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
526 Hit->Dump();
527 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
528 hitForRec->Dump();}
529 return hitForRec;
530}
531
532 //__________________________________________________________________________
533void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
534{
535 // Sort HitsForRec's in increasing order with respect to chamber number.
536 // Uses the function "Compare".
537 // Update the information for HitsForRec per chamber too.
538 Int_t ch, nhits, prevch;
539 fHitsForRecPtr->Sort();
540 for (ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) {
541 fNHitsForRecPerChamber[ch] = 0;
542 fIndexOfFirstHitForRecPerChamber[ch] = 0;
543 }
544 prevch = 0; // previous chamber
545 nhits = 0; // number of hits in current chamber
546 // Loop over HitsForRec
547 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
548 // chamber number (0...)
549 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
550 // increment number of hits in current chamber
551 (fNHitsForRecPerChamber[ch])++;
552 // update index of first HitForRec in current chamber
553 // if chamber number different from previous one
554 if (ch != prevch) {
555 fIndexOfFirstHitForRecPerChamber[ch] = hit;
556 prevch = ch;
557 }
558 }
559 return;
560}
561
562// //__________________________________________________________________________
563// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
564// {
565// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
566// // To add to the list of hits for reconstruction
567// // the (cathode correlated) raw clusters
568// // No condition added, like in Fortran TRACKF_STAT,
569// // on the radius between RMin and RMax.
570// AliMUONHitForRec *hitForRec;
571// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
572// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
573// // Security on MUON ????
574// // Loop over tracking chambers
575// for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) {
576// // number of HitsForRec to 0 for the chamber
577// fNHitsForRecPerChamber[ch] = 0;
578// // index of first HitForRec for the chamber
579// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
580// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
581// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
582// MUON->ResetReconstHits();
583// TC->GetEvent();
584// Int_t ncor = (Int_t)reconst_hits->GetEntries();
585// // Loop over (cathode correlated) raw clusters
586// for (Int_t cor = 0; cor < ncor; cor++) {
587// AliMUONReconstHit * mCor =
588// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
589// // new AliMUONHitForRec from (cathode correlated) raw cluster
590// // and increment number of AliMUONHitForRec's (total and in chamber)
591// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
592// fNHitsForRec++;
593// (fNHitsForRecPerChamber[ch])++;
594// // more information into HitForRec
595// hitForRec->SetChamberNumber(ch);
596// hitForRec->SetHitNumber(cor);
597// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
598// // could (should) be more exact from chamber geometry ????
599// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
600// if (fPrintLevel >= 10) {
601// cout << "chamber (0...): " << ch <<
602// " cathcorrel (0...): " << cor << endl;
603// mCor->Dump();
604// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
605// hitForRec->Dump();}
606// } // end of cluster loop
607// } // end of chamber loop
608// return;
609// }
610
611 //__________________________________________________________________________
612void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
613{
614 // To add to the list of hits for reconstruction all the raw clusters
615 // No condition added, like in Fortran TRACKF_STAT,
616 // on the radius between RMin and RMax.
617 AliMUONHitForRec *hitForRec;
618 AliMUONRawCluster *clus;
619 Int_t iclus, nclus;
620 TClonesArray *rawclusters;
621 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
622 AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
623 // Security on MUON ????
624 // Loop over tracking chambers
625 for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) {
626 // number of HitsForRec to 0 for the chamber
627 fNHitsForRecPerChamber[ch] = 0;
628 // index of first HitForRec for the chamber
629 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
630 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
631 rawclusters = MUON->RawClustAddress(ch);
632 MUON->ResetRawClusters();
633 TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
634 nclus = (Int_t) (rawclusters->GetEntries());
635 // Loop over (cathode correlated) raw clusters
636 for (iclus = 0; iclus < nclus; iclus++) {
637 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
638 // new AliMUONHitForRec from raw cluster
639 // and increment number of AliMUONHitForRec's (total and in chamber)
640 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
641 fNHitsForRec++;
642 (fNHitsForRecPerChamber[ch])++;
643 // more information into HitForRec
644 // resolution: info should be already in raw cluster and taken from it ????
645 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
646 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
647 // original raw cluster
648 hitForRec->SetChamberNumber(ch);
649 hitForRec->SetHitNumber(iclus);
650 // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
651 // could (should) be more exact from chamber geometry ????
652 hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
653 if (fPrintLevel >= 10) {
654 cout << "chamber (0...): " << ch <<
655 " raw cluster (0...): " << iclus << endl;
656 clus->Dump();
657 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
658 hitForRec->Dump();}
659 } // end of cluster loop
660 } // end of chamber loop
661 return;
662}
663
664 //__________________________________________________________________________
665void AliMUONEventReconstructor::MakeSegments(void)
666{
667 // To make the list of segments in all stations,
668 // from the list of hits to be reconstructed
669 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
670 ResetSegments();
671 // Loop over stations
672 for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++)
673 MakeSegmentsPerStation(st);
674 if (fPrintLevel >= 10) {
675 cout << "end of MakeSegments" << endl;
676 for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) {
677 cout << "station(0...): " << st
678 << " Segments: " << fNSegments[st]
679 << endl;
680 for (Int_t seg = 0;
681 seg < fNSegments[st];
682 seg++) {
683 cout << "Segment index(0...): " << seg << endl;
684 ((*fSegmentsPtr[st])[seg])->Dump();
685 }
686 }
687 }
688 return;
689}
690
691 //__________________________________________________________________________
692void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
693{
694 // To make the list of segments in station number "Station" (0...)
695 // from the list of hits to be reconstructed.
696 // Updates "fNSegments"[Station].
697 // Segments in stations 4 and 5 are sorted
698 // according to increasing absolute value of "impact parameter"
699 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
700 AliMUONSegment *segment;
701 Bool_t last2st;
702 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
703 impactParam, maxImpactParam;
704 AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
705 if (fPrintLevel >= 1)
706 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
707 // first and second chambers (0...) in the station
708 Int_t ch1 = 2 * Station;
709 Int_t ch2 = ch1 + 1;
710 // variable true for stations downstream of the dipole:
711 // Station(0..4) equal to 3 or 4
712 if ((Station == 3) || (Station == 4)) {
713 last2st = kTRUE;
714 // maximum impact parameter (cm) according to fMinBendingMomentum...
715 maxImpactParam =
716 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
717 }
718 else last2st = kFALSE;
719 // extrapolation factor from Z of first chamber to Z of second chamber
720 // dZ to be changed to take into account fine structure of chambers ????
721 Double_t extrapFact =
722 (&(MUON->Chamber(ch2)))->Z() / (&(MUON->Chamber(ch1)))->Z();
723 // index for current segment
724 Int_t segmentIndex = 0;
725 // Loop over HitsForRec in the first chamber of the station
726 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
727 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
728 hit1++) {
729 // pointer to the HitForRec
730 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
731 // extrapolation,
732 // on the straight line joining the HitForRec to the vertex (0,0,0),
733 // to the Z of the second chamber of the station
734 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
735 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
736 // Loop over HitsForRec in the second chamber of the station
737 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
738 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
739 hit2++) {
740 // pointer to the HitForRec
741 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
742 // absolute values of distances, in bending and non bending planes,
743 // between the HitForRec in the second chamber
744 // and the previous extrapolation
745 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
746 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
747 if (last2st) {
748 // bending slope
749 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
750 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
751 // absolute value of impact parameter
752 impactParam =
753 TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope);
754 }
755 // check for distances not too large,
756 // and impact parameter not too big if stations downstream of the dipole.
757 // Conditions "distBend" and "impactParam" correlated for these stations ????
758 if ((distBend < fSegmentMaxDistBending[Station]) &&
759 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
760 (!last2st || (impactParam < maxImpactParam))) {
761 // make new segment
762 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
763 AliMUONSegment(hit1Ptr, hit2Ptr);
764 // update "link" to this segment from the hit in the first chamber
765 if (hit1Ptr->GetNSegments() == 0)
766 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
767 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
768 if (fPrintLevel >= 10) {
769 cout << "segmentIndex(0...): " << segmentIndex
770 << " distBend: " << distBend
771 << " distNonBend: " << distNonBend
772 << endl;
773 segment->Dump();
774 cout << "HitForRec in first chamber" << endl;
775 hit1Ptr->Dump();
776 cout << "HitForRec in second chamber" << endl;
777 hit2Ptr->Dump();
778 };
779 // increment index for current segment
780 segmentIndex++;
781 }
782 } //for (Int_t hit2
783 } // for (Int_t hit1...
784 fNSegments[Station] = segmentIndex;
785 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
786 // i.e. Station(0..4) 3 or 4, using the function "Compare".
787 // After this sorting, it is impossible to use
788 // the "fNSegments" and "fIndexOfFirstSegment"
789 // of the HitForRec in the first chamber to explore all segments formed with it.
790 // Is this sorting really needed ????
791 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
792 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
793 << fNSegments[Station] << endl;
794 return;
795}
796
797 //__________________________________________________________________________
798void AliMUONEventReconstructor::MakeTracks(void)
799{
800 // To make the tracks,
801 // from the list of segments and points in all stations
802 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
803 ResetTracks();
804 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
805 MakeTrackCandidates();
806 // Follow tracks in stations(1..) 3, 2 and 1
807 FollowTracks();
808 return;
809}
810
811 //__________________________________________________________________________
812Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
813{
814 // To make track candidates with two segments in stations(1..) 4 and 5,
815 // the first segment being pointed to by "BegSegment".
816 // Returns the number of such track candidates.
817 Int_t endStation, iEndSegment, nbCan2Seg;
818 AliMUONSegment *endSegment, *extrapSegment;
819 AliMUONTrack *recTrack;
820 Double_t mcsFactor;
821 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
822 // Station for the end segment
823 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
824 // multiple scattering factor corresponding to one chamber
825 mcsFactor = 0.0136 /
826 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
827 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
828 // linear extrapolation to end station
829 extrapSegment =
830 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
831 // number of candidates with 2 segments to 0
832 nbCan2Seg = 0;
833 // Loop over segments in the end station
834 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
835 // pointer to segment
836 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
837 // test compatibility between current segment and "extrapSegment"
838 if ((endSegment->
839 NormalizedChi2WithSegment(extrapSegment,
840 fMaxSigma2Distance)) <= 4.0) {
841 // both segments compatible:
842 // make track candidate from "begSegment" and "endSegment"
843 if (fPrintLevel >= 2)
844 cout << "TrackCandidate with Segment " << iEndSegment <<
845 " in Station(0..) " << endStation << endl;
846 // flag for both segments in one track:
847 // to be done in track constructor ????
848 BegSegment->SetInTrack(kTRUE);
849 endSegment->SetInTrack(kTRUE);
850 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
851 AliMUONTrack(BegSegment, endSegment, this);
852 fNRecTracks++;
853 if (fPrintLevel >= 10) recTrack->RecursiveDump();
854 // increment number of track candidates with 2 segments
855 nbCan2Seg++;
856 }
857 } // for (iEndSegment = 0;...
858 delete extrapSegment; // should not delete HitForRec's it points to !!!!
859 return nbCan2Seg;
860}
861
862 //__________________________________________________________________________
863Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
864{
865 // To make track candidates with one segment and one point
866 // in stations(1..) 4 and 5,
867 // the segment being pointed to by "BegSegment".
868 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
869 AliMUONHitForRec *extrapHitForRec, *hit;
870 AliMUONTrack *recTrack;
871 Double_t mcsFactor;
872 if (fPrintLevel >= 1)
873 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
874 // station for the end point
875 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
876 // multiple scattering factor corresponding to one chamber
877 mcsFactor = 0.0136 /
878 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
879 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
880 // first and second chambers(0..) in the end station
881 ch1 = 2 * endStation;
882 ch2 = ch1 + 1;
883 // number of candidates to 0
884 nbCan1Seg1Hit = 0;
885 // Loop over chambers of the end station
886 for (ch = ch2; ch >= ch1; ch--) {
887 // linear extrapolation to chamber
888 extrapHitForRec =
889 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
890 // limits for the hit index in the loop
891 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
892 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
893 // Loop over HitForRec's in the chamber
894 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
895 // pointer to HitForRec
896 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
897 // test compatibility between current HitForRec and "extrapHitForRec"
898 if ((hit->
899 NormalizedChi2WithHitForRec(extrapHitForRec,
900 fMaxSigma2Distance)) <= 2.0) {
901 // both HitForRec's compatible:
902 // make track candidate from begSegment and current HitForRec
903 if (fPrintLevel >= 2)
904 cout << "TrackCandidate with HitForRec " << iHit <<
905 " in Chamber(0..) " << ch << endl;
906 // flag for beginning segments in one track:
907 // to be done in track constructor ????
908 BegSegment->SetInTrack(kTRUE);
909 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
910 AliMUONTrack(BegSegment, hit, this);
911 // the right place to eliminate "double counting" ???? how ????
912 fNRecTracks++;
913 if (fPrintLevel >= 10) recTrack->RecursiveDump();
914 // increment number of track candidates
915 nbCan1Seg1Hit++;
916 }
917 } // for (iHit = iHitMin;...
918 delete extrapHitForRec;
919 } // for (ch = ch2;...
920 return nbCan1Seg1Hit;
921}
922
923 //__________________________________________________________________________
924void AliMUONEventReconstructor::MakeTrackCandidates(void)
925{
926 // To make track candidates
927 // with at least 3 aligned points in stations(1..) 4 and 5
928 // (two Segment's or one Segment and one HitForRec)
929 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
930 AliMUONSegment *begSegment;
931 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
932 // Loop over stations(1..) 5 and 4 for the beginning segment
933 for (begStation = 4; begStation > 2; begStation--) {
934 // Loop over segments in the beginning station
935 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
936 // pointer to segment
937 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
938 if (fPrintLevel >= 2)
939 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
940 " in Station(0..) " << begStation << endl;
941 // Look for track candidates with two segments,
942 // "begSegment" and all compatible segments in other station.
943 // Only for beginning station(1..) 5
944 // because candidates with 2 segments have to looked for only once.
945 if (begStation == 4)
946 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
947 // Look for track candidates with one segments and one point,
948 // "begSegment" and all compatible HitForRec's in other station.
949 // Only if "begSegment" does not belong already to a track candidate.
950 // Is that a too strong condition ????
951 if (!(begSegment->GetInTrack()))
952 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
953 } // for (iBegSegment = 0;...
954 } // for (begStation = 4;...
955 return;
956}
957
958 //__________________________________________________________________________
959void AliMUONEventReconstructor::FollowTracks(void)
960{
961 // Follow tracks in stations(1..) 3, 2 and 1
962 AliMUONHitForRec *bestHit, *extrapHit, *hit;
963 AliMUONSegment *bestSegment, *extrapSegment, *segment;
964 AliMUONTrack *track;
965 AliMUONTrackParam *trackParam1, trackParam[2];
966 Int_t ch, chBestHit, iHit, iSegment, station, trackIndex;
967 Double_t bestChi2, chi2, dZ1, dZ2, maxSigma2Distance, mcsFactor;
968 AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
969 maxSigma2Distance = 4. * fMaxSigma2Distance; // sigma2cut increased by 4 !!!!
970 if (fPrintLevel >= 2)
971 cout << "enter FollowTracks" << endl;
972 // Loop over track candidates
973 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
974 if (fPrintLevel >= 2)
975 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
976 // function for each track candidate ????
977 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
978 // Fit track candidate from vertex at X = Y = 0
979 track->Fit(track->GetTrackParamAtVertex(), 3);
980 if (fPrintLevel >= 10) {
981 cout << "FollowTracks: track candidate(0..): " << trackIndex
982 << " after fit in stations(1..) 4 and 5" << endl;
983 track->RecursiveDump();
984 }
985 // Loop over stations(1..) 3, 2 and 1
986 // something SPECIAL for stations 2 and 1 for majority coincidence ????
987 for (station = 2; station >= 0; station--) {
988 // Track parameters at first track hit (smallest Z)
989 trackParam1 = ((AliMUONTrackHit*)
990 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
991 // extrapolation to station
992 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 993 extrapSegment = new AliMUONSegment(); // empty segment
a9e2aefa 994 // multiple scattering factor corresponding to one chamber
995 // and momentum in bending plane (not total)
996 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
997 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
998 // Z difference from previous station
999 dZ1 = (&(MUON->Chamber(2 * station)))->Z() -
1000 (&(MUON->Chamber(2 * station + 2)))->Z();
1001 // Z difference between the two previous stations
1002 dZ2 = (&(MUON->Chamber(2 * station + 2)))->Z() -
1003 (&(MUON->Chamber(2 * station + 4)))->Z();
1004 extrapSegment->SetBendingCoorReso2(fBendingResolution);
1005 extrapSegment->SetNonBendingCoorReso2(fNonBendingResolution);
1006 extrapSegment->UpdateFromStationTrackParam(trackParam, mcsFactor, dZ1, dZ2);
1007 bestChi2 = 5.0;
1008 bestSegment = NULL;
1009 if (fPrintLevel >= 10) {
1010 cout << "FollowTracks: track candidate(0..): " << trackIndex
1011 << " Look for segment in station(0..): " << station << endl;
1012 }
1013 // Loop over segments in station
1014 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1015 // Look for best compatible Segment in station
1016 // should consider all possibilities ????
1017 // multiple scattering ????
1018 // separation in 2 functions: Segment and HitForRec ????
1019 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1020 chi2 = segment->NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance);
1021 if (chi2 < bestChi2) {
1022 // update best Chi2 and Segment if better found
1023 bestSegment = segment;
1024 bestChi2 = chi2;
1025 }
1026 }
1027 if (bestSegment) {
1028 // best segment found: add it to track candidate
1029 track->AddSegment(bestSegment);
1030 // set track parameters at these two TrakHit's
1031 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1032 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1033 if (fPrintLevel >= 10) {
1034 cout << "FollowTracks: track candidate(0..): " << trackIndex
1035 << " Added segment in station(0..): " << station << endl;
1036 track->RecursiveDump();
1037 }
1038 }
1039 else {
1040 // No best segment found:
1041 // Look for best compatible HitForRec in station:
1042 // should consider all possibilities ????
1043 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1044 extrapHit = new AliMUONHitForRec(); // empty hit
a9e2aefa 1045 bestChi2 = 3.0;
1046 bestHit = NULL;
1047 if (fPrintLevel >= 10) {
1048 cout << "FollowTracks: track candidate(0..): " << trackIndex
1049 << " Segment not found, look for hit in station(0..): " << station
1050 << endl;
1051 }
1052 // Loop over chambers of the station
1053 for (ch = 0; ch < 2; ch++) {
1054 // coordinates of extrapolated hit
1055 extrapHit->SetBendingCoor((&(trackParam[ch]))->GetBendingCoor());
1056 extrapHit->SetNonBendingCoor((&(trackParam[ch]))->GetNonBendingCoor());
1057 // resolutions from "extrapSegment"
1058 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1059 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1060 // Loop over hits in the chamber
1061 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1062 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1063 fNHitsForRecPerChamber[ch];
1064 iHit++) {
1065 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1066 // condition for hit not already in segment ????
1067 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1068 if (chi2 < bestChi2) {
1069 // update best Chi2 and HitForRec if better found
1070 bestHit = hit;
1071 bestChi2 = chi2;
1072 chBestHit = ch;
1073 }
1074 }
1075 }
1076 if (bestHit) {
1077 // best hit found: add it to track candidate
1078 track->AddHitForRec(bestHit);
1079 // set track parameters at these two TrakHit's
1080 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1081 &(trackParam[chBestHit]));
1082 if (fPrintLevel >= 10) {
1083 cout << "FollowTracks: track candidate(0..): " << trackIndex
1084 << " Added hit in station(0..): " << station << endl;
1085 track->RecursiveDump();
1086 }
1087 }
1088 else {
1089 fRecTracksPtr->RemoveAt(trackIndex); // Remove candidate
1090 break; // stop the search for this candidate:
1091 // exit from the loop over station
1092 }
1093 }
1094 // Sort track hits according to increasing Z
1095 track->GetTrackHitsPtr()->Sort();
1096 // Update track parameters at first track hit (smallest Z)
1097 trackParam1 = ((AliMUONTrackHit*)
1098 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1099 // Track fit from first track hit varying X and Y
1100 track->Fit(trackParam1, 5);
1101 if (fPrintLevel >= 10) {
1102 cout << "FollowTracks: track candidate(0..): " << trackIndex
1103 << " after fit from station(0..): " << station << " to 4" << endl;
1104 track->RecursiveDump();
1105 }
1106 delete extrapSegment;
1107 } // for (station = 2;...
1108 } // for (trackIndex = 0;...
1109 return;
1110}
1111
1112void AliMUONEventReconstructor::Streamer(TBuffer &R__b)
1113{
1114 ;
1115}