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