Changed declarations to be in the order public, protected, private required by coding...
[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
88cb7938 16/* $Id$ */
a9e2aefa 17
3831f268 18////////////////////////////////////
a9e2aefa 19//
20// MUON event reconstructor in ALICE
21//
22// This class contains as data:
23// * the parameters for the event reconstruction
24// * a pointer to the array of hits to be reconstructed (the event)
25// * a pointer to the array of segments made with these hits inside each station
26// * a pointer to the array of reconstructed tracks
27//
28// It contains as methods, among others:
29// * MakeEventToBeReconstructed to build the array of hits to be reconstructed
30// * MakeSegments to build the segments
31// * MakeTracks to build the tracks
3831f268 32//
33////////////////////////////////////
a9e2aefa 34
70479d0e 35#include <Riostream.h> // for cout
82a4bc7b 36#include <stdlib.h> // for exit()
a9e2aefa 37
94de3818 38#include <TTree.h>
a9e2aefa 39
a9e2aefa 40#include "AliMUON.h"
52c9bc11 41//#include "AliMUONChamber.h"
3831f268 42#include "AliMUONEventReconstructor.h"
a9e2aefa 43#include "AliMUONHitForRec.h"
276c44b7 44#include "AliMUONTriggerTrack.h"
45//#include "AliMUONTriggerConstants.h"
46#include "AliMUONTriggerCircuit.h"
a9e2aefa 47#include "AliMUONRawCluster.h"
276c44b7 48#include "AliMUONLocalTrigger.h"
52c9bc11 49#include "AliMUONGlobalTrigger.h"
3831f268 50#include "AliMUONRecoEvent.h"
51#include "AliMUONSegment.h"
a9e2aefa 52#include "AliMUONTrack.h"
a9e2aefa 53#include "AliMUONTrackHit.h"
94de3818 54#include "AliMagF.h"
3831f268 55#include "AliRun.h" // for gAlice
88cb7938 56#include "AliConfig.h"
57#include "AliRunLoader.h"
58#include "AliLoader.h"
83dbc640 59#include "AliMUONTrackK.h" //AZ
60#include <TMatrixD.h> //AZ
5d12ce38 61#include "AliMC.h"
a9e2aefa 62
a9e2aefa 63//************* Defaults parameters for reconstruction
9cbdf048 64static const Double_t kDefaultMinBendingMomentum = 3.0;
d0bfce8d 65static const Double_t kDefaultMaxBendingMomentum = 500.0;
66static const Double_t kDefaultMaxChi2 = 100.0;
9cbdf048 67static const Double_t kDefaultMaxSigma2Distance = 16.0;
68static const Double_t kDefaultBendingResolution = 0.01;
69static const Double_t kDefaultNonBendingResolution = 0.144;
70static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 71// Simple magnetic field:
72// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
73// Length and Position from reco_muon.F, with opposite sign:
74// Length = ZMAGEND-ZCOIL
75// Position = (ZMAGEND+ZCOIL)/2
76// to be ajusted differently from real magnetic field ????
9cbdf048 77static const Double_t kDefaultSimpleBValue = 7.0;
78static const Double_t kDefaultSimpleBLength = 428.0;
79static const Double_t kDefaultSimpleBPosition = 1019.0;
80static const Int_t kDefaultRecGeantHits = 0;
81static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 82
70b6e084 83static const Int_t kDefaultPrintLevel = -1;
a9e2aefa 84
85ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
86
87 //__________________________________________________________________________
52c9bc11 88AliMUONEventReconstructor::AliMUONEventReconstructor(AliLoader* loader)
a9e2aefa 89{
90 // Constructor for class AliMUONEventReconstructor
91 SetReconstructionParametersToDefaults();
83dbc640 92 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
a9e2aefa 93 // Memory allocation for the TClonesArray of hits for reconstruction
94 // Is 10000 the right size ????
95 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
96 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
97 // Memory allocation for the TClonesArray's of segments in stations
98 // Is 2000 the right size ????
9cbdf048 99 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 100 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
101 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
102 }
103 // Memory allocation for the TClonesArray of reconstructed tracks
104 // Is 10 the right size ????
105 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
106 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
276c44b7 107// trigger tracks
108 fRecTriggerTracksPtr = new TClonesArray("AliMUONTriggerTrack", 10);
109 fNRecTriggerTracks = 0; // really needed or GetEntriesFast sufficient ????
8429a5e4 110 // Memory allocation for the TClonesArray of hits on reconstructed tracks
111 // Is 100 the right size ????
112 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
113 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
a9e2aefa 114
5b64e914 115 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
a6f03ddb 116 Float_t b[3], x[3];
5b64e914 117 x[0] = 50.; x[1] = 50.; x[2] = -950.;
a6f03ddb 118 gAlice->Field()->Field(x, b);
065bd0e1 119 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
5b64e914 120 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
a6f03ddb 121 // See how to get fSimple(BValue, BLength, BPosition)
122 // automatically calculated from the actual magnetic field ????
a9e2aefa 123
124 if (fPrintLevel >= 0) {
a6f03ddb 125 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
126 cout << endl << "Magnetic field from root file:" << endl;
127 gAlice->Field()->Dump();
128 cout << endl;
129 }
c7ba256d 130
47a6b602 131 // Initializions for GEANT background events
132 fBkgGeantFile = 0;
133 fBkgGeantTK = 0;
134 fBkgGeantParticles = 0;
135 fBkgGeantTH = 0;
136 fBkgGeantHits = 0;
137 fBkgGeantEventNumber = -1;
138
c7ba256d 139 // Initialize to 0 pointers to RecoEvent, tree and tree file
140 fRecoEvent = 0;
141 fEventTree = 0;
142 fTreeFile = 0;
52c9bc11 143
144 // initialize loader's
145 fLoader = loader;
146
147 // initialize container
148 fMUONData = new AliMUONData(fLoader,"MUON","MUON");
149
150 // Loading AliRun master
151 AliRunLoader* runloader = fLoader->GetRunLoader();
152 if (runloader->GetAliRun() == 0x0) runloader->LoadgAlice();
153 gAlice = runloader->GetAliRun();
154
a9e2aefa 155 return;
156}
52c9bc11 157 //__________________________________________________________________________
d9a3473d 158AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
9cbdf048 159{
160 // Dummy copy constructor
161}
162
d9a3473d 163AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
9cbdf048 164{
165 // Dummy assignment operator
166 return *this;
167}
168
a9e2aefa 169 //__________________________________________________________________________
170AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
171{
172 // Destructor for class AliMUONEventReconstructor
c7ba256d 173 if (fTreeFile) {
174 fTreeFile->Close();
175 delete fTreeFile;
176 }
177// if (fEventTree) delete fEventTree;
178 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 179 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 180 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 181 delete fSegmentsPtr[st]; // Correct destruction of everything ????
182 return;
183}
184
185 //__________________________________________________________________________
186void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
187{
188 // Set reconstruction parameters to default values
189 // Would be much more convenient with a structure (or class) ????
9cbdf048 190 fMinBendingMomentum = kDefaultMinBendingMomentum;
d0bfce8d 191 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
192 fMaxChi2 = kDefaultMaxChi2;
9cbdf048 193 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 194
9cbdf048 195 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 196 // ******** Parameters for making HitsForRec
197 // minimum radius,
198 // like in TRACKF_STAT:
199 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
200 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
9cbdf048 201 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
202 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 203 2.0 * TMath::Pi() / 180.0;
204 else fRMin[ch] = 30.0;
d0bfce8d 205 // maximum radius at 10 degrees and Z of chamber
206 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
207 10.0 * TMath::Pi() / 180.0;
a9e2aefa 208 }
a9e2aefa 209
210 // ******** Parameters for making segments
211 // should be parametrized ????
212 // according to interval between chambers in a station ????
213 // Maximum distance in non bending plane
214 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
215 // SIGCUT*DYMAX(IZ)
9cbdf048 216 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 217 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 218 // Maximum distance in bending plane:
219 // values from TRACKF_STAT, corresponding to (J psi 20cm),
220 // scaled to the real distance between chambers in a station
ef21c79e 221 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
222 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
223 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
224 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
225 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
226 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
227 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
228 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
229 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
230 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
a9e2aefa 231
9cbdf048 232 fBendingResolution = kDefaultBendingResolution;
233 fNonBendingResolution = kDefaultNonBendingResolution;
234 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
235 fSimpleBValue = kDefaultSimpleBValue;
236 fSimpleBLength = kDefaultSimpleBLength;
237 fSimpleBPosition = kDefaultSimpleBPosition;
238 fRecGeantHits = kDefaultRecGeantHits;
239 fEfficiency = kDefaultEfficiency;
240 fPrintLevel = kDefaultPrintLevel;
a9e2aefa 241 return;
242}
243
244//__________________________________________________________________________
3831f268 245Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
a9e2aefa 246{
247 // Returns impact parameter at vertex in bending plane (cm),
248 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
249 // using simple values for dipole magnetic field.
065bd0e1 250 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 251 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
252 BendingMomentum);
253}
254
255//__________________________________________________________________________
3831f268 256Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
a9e2aefa 257{
258 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 259 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 260 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
261 // using simple values for dipole magnetic field.
a9e2aefa 262 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
263 ImpactParam);
264}
265
266//__________________________________________________________________________
267void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
268{
269 // Set background file ... for GEANT hits
270 // Must be called after having loaded the firts signal event
271 if (fPrintLevel >= 0) {
272 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
273 << BkgGeantFileName << "''" << endl;}
274 if (strlen(BkgGeantFileName)) {
275 // BkgGeantFileName not empty: try to open the file
276 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
277 fBkgGeantFile = new TFile(BkgGeantFileName);
278 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
279 if (fBkgGeantFile-> IsOpen()) {
280 if (fPrintLevel >= 0) {
281 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
282 << "'' successfully opened" << endl;}
283 }
284 else {
285 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
286 cout << "NOT FOUND: EXIT" << endl;
287 exit(0); // right instruction for exit ????
288 }
289 // Arrays for "particles" and "hits"
290 fBkgGeantParticles = new TClonesArray("TParticle", 200);
291 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
292 // Event number to -1 for initialization
293 fBkgGeantEventNumber = -1;
294 // Back to the signal file:
295 // first signal event must have been loaded previously,
296 // otherwise, Segmentation violation at the next instruction
297 // How is it possible to do smething better ????
298 ((gAlice->TreeK())->GetCurrentFile())->cd();
299 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
300 }
301 return;
302}
303
304//__________________________________________________________________________
305void AliMUONEventReconstructor::NextBkgGeantEvent(void)
306{
307 // Get next event in background file for GEANT hits
308 // Goes back to event number 0 when end of file is reached
309 char treeName[20];
310 TBranch *branch;
311 if (fPrintLevel >= 0) {
312 cout << "Enter NextBkgGeantEvent" << endl;}
313 // Clean previous event
314 if(fBkgGeantTK) delete fBkgGeantTK;
315 fBkgGeantTK = NULL;
316 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
317 if(fBkgGeantTH) delete fBkgGeantTH;
318 fBkgGeantTH = NULL;
319 if(fBkgGeantHits) fBkgGeantHits->Clear();
320 // Increment event number
321 fBkgGeantEventNumber++;
322 // Get access to Particles and Hits for event from background file
323 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
324 fBkgGeantFile->cd();
325 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
326 // Particles: TreeK for event and branch "Particles"
327 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
328 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
329 if (!fBkgGeantTK) {
330 if (fPrintLevel >= 0) {
331 cout << "Cannot find Kine Tree for background event: " <<
332 fBkgGeantEventNumber << endl;
333 cout << "Goes back to event 0" << endl;
334 }
335 fBkgGeantEventNumber = 0;
336 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
337 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
338 if (!fBkgGeantTK) {
339 cout << "ERROR: cannot find Kine Tree for background event: " <<
340 fBkgGeantEventNumber << endl;
341 exit(0);
342 }
343 }
344 if (fBkgGeantTK)
345 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
346 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
347 // Hits: TreeH for event and branch "MUON"
348 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
349 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
350 if (!fBkgGeantTH) {
351 cout << "ERROR: cannot find Hits Tree for background event: " <<
352 fBkgGeantEventNumber << endl;
353 exit(0);
354 }
355 if (fBkgGeantTH && fBkgGeantHits) {
356 branch = fBkgGeantTH->GetBranch("MUON");
357 if (branch) branch->SetAddress(&fBkgGeantHits);
358 }
359 fBkgGeantTH->GetEntries(); // necessary ????
360 // Back to the signal file
361 ((gAlice->TreeK())->GetCurrentFile())->cd();
362 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
363 return;
364}
365
366//__________________________________________________________________________
367void AliMUONEventReconstructor::EventReconstruct(void)
368{
369 // To reconstruct one event
370 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
371 MakeEventToBeReconstructed();
372 MakeSegments();
373 MakeTracks();
d837040f 374 if (fMUONData->IsTriggerTrackBranchesInTree())
375 ValidateTracksWithTrigger();
376
377 // Add tracks to MUON data container
378 for(Int_t i=0; i<GetNRecTracks(); i++) {
379 AliMUONTrack * track = (AliMUONTrack*) GetRecTracksPtr()->At(i);
380 fMUONData->AddRecTrack(*track);
381 }
382
a9e2aefa 383 return;
384}
385
276c44b7 386//__________________________________________________________________________
387void AliMUONEventReconstructor::EventReconstructTrigger(void)
388{
389 // To reconstruct one event
390 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
391 MakeTriggerTracks();
392 return;
393}
394
a9e2aefa 395 //__________________________________________________________________________
396void AliMUONEventReconstructor::ResetHitsForRec(void)
397{
398 // To reset the array and the number of HitsForRec,
399 // and also the number of HitsForRec
400 // and the index of the first HitForRec per chamber
401 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
402 fNHitsForRec = 0;
9cbdf048 403 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 404 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
405 return;
406}
407
408 //__________________________________________________________________________
409void AliMUONEventReconstructor::ResetSegments(void)
410{
411 // To reset the TClonesArray of segments and the number of Segments
412 // for all stations
9cbdf048 413 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 414 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
415 fNSegments[st] = 0;
416 }
417 return;
418}
419
420 //__________________________________________________________________________
421void AliMUONEventReconstructor::ResetTracks(void)
422{
423 // To reset the TClonesArray of reconstructed tracks
8429a5e4 424 if (fRecTracksPtr) fRecTracksPtr->Delete();
425 // Delete in order that the Track destructors are called,
426 // hence the space for the TClonesArray of pointers to TrackHit's is freed
a9e2aefa 427 fNRecTracks = 0;
428 return;
429}
430
276c44b7 431 //__________________________________________________________________________
432void AliMUONEventReconstructor::ResetTriggerTracks(void)
433{
434 // To reset the TClonesArray of reconstructed trigger tracks
435 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
436 // Delete in order that the Track destructors are called,
437 // hence the space for the TClonesArray of pointers to TrackHit's is freed
438 fNRecTriggerTracks = 0;
439 return;
440}
441
8429a5e4 442 //__________________________________________________________________________
443void AliMUONEventReconstructor::ResetTrackHits(void)
444{
445 // To reset the TClonesArray of hits on reconstructed tracks
446 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
447 fNRecTrackHits = 0;
448 return;
449}
450
a9e2aefa 451 //__________________________________________________________________________
452void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
453{
454 // To make the list of hits to be reconstructed,
455 // either from the GEANT hits or from the raw clusters
456 // according to the parameter set for the reconstructor
e191bb57 457// TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
88cb7938 458
52c9bc11 459// AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
460// if (rl == 0x0)
461// {
462// Error("MakeEventToBeReconstructed",
463// "Can not find Run Loader in Event Folder named %s.",
464// evfoldname.Data());
465// return;
466// }
467// AliLoader* gime = rl->GetLoader("MUONLoader");
468// if (gime == 0x0)
469// {
470// Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
471// return;
472// }
88cb7938 473
a9e2aefa 474 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
475 ResetHitsForRec();
476 if (fRecGeantHits == 1) {
477 // Reconstruction from GEANT hits
478 // Back to the signal file
52c9bc11 479 TTree* treeH = fLoader->TreeH();
88cb7938 480 if (treeH == 0x0)
481 {
52c9bc11 482 Int_t retval = fLoader->LoadHits();
88cb7938 483 if ( retval)
484 {
485 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
486 return;
487 }
52c9bc11 488 treeH = fLoader->TreeH();
88cb7938 489 if (treeH == 0x0)
490 {
491 Error("MakeEventToBeReconstructed","Can not get TreeH");
492 return;
493 }
494 }
52c9bc11 495 fMUONData->SetTreeAddress("H");
496 AddHitsForRecFromGEANT(treeH);
88cb7938 497
a9e2aefa 498 // Background hits
499 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
500 // Sort HitsForRec in increasing order with respect to chamber number
501 SortHitsForRecWithIncreasingChamber();
502 }
503 else {
504 // Reconstruction from raw clusters
505 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
506 // Security on MUON ????
507 // TreeR assumed to be be "prepared" in calling function
508 // by "MUON->GetTreeR(nev)" ????
52c9bc11 509 TTree *treeR = fLoader->TreeR();
510 fMUONData->SetTreeAddress("RC");
9cbdf048 511 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 512 // No sorting: it is done automatically in the previous function
513 }
514 if (fPrintLevel >= 10) {
515 cout << "end of MakeEventToBeReconstructed" << endl;
516 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 517 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 518 cout << "chamber(0...): " << ch
519 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
520 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
521 << endl;
522 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
523 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
524 hit++) {
525 cout << "HitForRec index(0...): " << hit << endl;
526 ((*fHitsForRecPtr)[hit])->Dump();
527 }
528 }
529 }
530 return;
531}
532
533 //__________________________________________________________________________
534void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
535{
536 // To add to the list of hits for reconstruction
537 // the GEANT signal hits from a hit tree TH.
83dbc640 538 Int_t hitBits, chamBits; //AZ
a9e2aefa 539 if (fPrintLevel >= 2)
540 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
541 if (TH == NULL) return;
52c9bc11 542 // AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
543 //AliMUONData * muondata = pMUON->GetMUONData();
a9e2aefa 544 // Security on MUON ????
545 // See whether it could be the same for signal and background ????
546 // Loop over tracks in tree
547 Int_t ntracks = (Int_t) TH->GetEntries();
548 if (fPrintLevel >= 2)
549 cout << "ntracks: " << ntracks << endl;
83dbc640 550 fMuons = 0; //AZ
a9e2aefa 551 for (Int_t track = 0; track < ntracks; track++) {
52c9bc11 552 fMUONData->ResetHits();
a9e2aefa 553 TH->GetEvent(track);
554 // Loop over hits
555 Int_t hit = 0;
83dbc640 556 hitBits = 0; // AZ
557 chamBits = 0; // AZ
558 Int_t itrack = track; //AZ
38302c61 559
560 Int_t ihit, nhits=0;
52c9bc11 561 nhits = (Int_t) fMUONData->Hits()->GetEntriesFast();
38302c61 562 AliMUONHit* mHit=0x0;
1391e633 563
38302c61 564 for(ihit=0; ihit<nhits; ihit++) {
52c9bc11 565 mHit = static_cast<AliMUONHit*>(fMUONData->Hits()->At(ihit));
38302c61 566 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
567 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
568 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
1391e633 569 && itrack <= 2 && !BIT(mHit->Chamber()-1) ) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
38302c61 570 }
1391e633 571
83dbc640 572 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
573 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
574 fMuons += 1; //AZ
575 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
576 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
577 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
a9e2aefa 578 } // end of track loop
579 return;
580}
581
582 //__________________________________________________________________________
583void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
584{
585 // To add to the list of hits for reconstruction
586 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
587 // How to have only one function "AddHitsForRecFromGEANT" ????
588 if (fPrintLevel >= 2)
589 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
590 if (TH == NULL) return;
591 // Loop over tracks in tree
592 Int_t ntracks = (Int_t) TH->GetEntries();
593 if (fPrintLevel >= 2)
594 cout << "ntracks: " << ntracks << endl;
595 for (Int_t track = 0; track < ntracks; track++) {
596 if (Hits) Hits->Clear();
597 TH->GetEvent(track);
598 // Loop over hits
599 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
600 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
601 } // end of hit loop
602 } // end of track loop
603 return;
604}
605
606 //__________________________________________________________________________
607AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
608{
609 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
610 // with hit number "HitNumber" in the track numbered "TrackNumber",
611 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
612 // Selects hits in tracking (not trigger) chambers.
613 // Takes into account the efficiency (fEfficiency)
614 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
615 // Adds a condition on the radius between RMin and RMax
616 // to better simulate the real chambers.
617 // Returns the pointer to the new hit for reconstruction,
618 // or NULL in case of inefficiency or non tracking chamber or bad radius.
619 // No condition on at most 20 cm from a muon from a resonance
620 // like in Fortran TRACKF_STAT.
621 AliMUONHitForRec* hitForRec;
622 Double_t bendCoor, nonBendCoor, radius;
0a5f36d9 623 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
a9e2aefa 624 // only in tracking chambers (fChamber starts at 1)
9cbdf048 625 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 626 // only if hit is efficient (keep track for checking ????)
627 if (gRandom->Rndm() > fEfficiency) return NULL;
628 // only if radius between RMin and RMax
94de3818 629 bendCoor = Hit->Y();
630 nonBendCoor = Hit->X();
a9e2aefa 631 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
d0bfce8d 632 // This cut is not needed with a realistic chamber geometry !!!!
633// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
a9e2aefa 634 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
635 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
636 fNHitsForRec++;
637 // add smearing from resolution
638 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
639 hitForRec->SetNonBendingCoor(nonBendCoor
640 + gRandom->Gaus(0., fNonBendingResolution));
d0bfce8d 641// // !!!! without smearing
642// hitForRec->SetBendingCoor(bendCoor);
643// hitForRec->SetNonBendingCoor(nonBendCoor);
a9e2aefa 644 // more information into HitForRec
645 // resolution: angular effect to be added here ????
646 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
647 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
648 // GEANT track info
649 hitForRec->SetHitNumber(HitNumber);
650 hitForRec->SetTHTrack(TrackNumber);
651 hitForRec->SetGeantSignal(Signal);
652 if (fPrintLevel >= 10) {
653 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
654 Hit->Dump();
655 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
656 hitForRec->Dump();}
657 return hitForRec;
658}
659
660 //__________________________________________________________________________
661void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
662{
663 // Sort HitsForRec's in increasing order with respect to chamber number.
664 // Uses the function "Compare".
665 // Update the information for HitsForRec per chamber too.
666 Int_t ch, nhits, prevch;
667 fHitsForRecPtr->Sort();
9cbdf048 668 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 669 fNHitsForRecPerChamber[ch] = 0;
670 fIndexOfFirstHitForRecPerChamber[ch] = 0;
671 }
672 prevch = 0; // previous chamber
673 nhits = 0; // number of hits in current chamber
674 // Loop over HitsForRec
675 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
676 // chamber number (0...)
677 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
678 // increment number of hits in current chamber
679 (fNHitsForRecPerChamber[ch])++;
680 // update index of first HitForRec in current chamber
681 // if chamber number different from previous one
682 if (ch != prevch) {
683 fIndexOfFirstHitForRecPerChamber[ch] = hit;
684 prevch = ch;
685 }
686 }
687 return;
688}
689
690// //__________________________________________________________________________
691// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
692// {
693// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
694// // To add to the list of hits for reconstruction
695// // the (cathode correlated) raw clusters
696// // No condition added, like in Fortran TRACKF_STAT,
697// // on the radius between RMin and RMax.
698// AliMUONHitForRec *hitForRec;
699// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
700// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
701// // Security on MUON ????
702// // Loop over tracking chambers
9cbdf048 703// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 704// // number of HitsForRec to 0 for the chamber
705// fNHitsForRecPerChamber[ch] = 0;
706// // index of first HitForRec for the chamber
707// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
708// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
709// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
710// MUON->ResetReconstHits();
711// TC->GetEvent();
712// Int_t ncor = (Int_t)reconst_hits->GetEntries();
713// // Loop over (cathode correlated) raw clusters
714// for (Int_t cor = 0; cor < ncor; cor++) {
715// AliMUONReconstHit * mCor =
716// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
717// // new AliMUONHitForRec from (cathode correlated) raw cluster
718// // and increment number of AliMUONHitForRec's (total and in chamber)
719// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
720// fNHitsForRec++;
721// (fNHitsForRecPerChamber[ch])++;
722// // more information into HitForRec
723// hitForRec->SetChamberNumber(ch);
724// hitForRec->SetHitNumber(cor);
725// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
726// // could (should) be more exact from chamber geometry ????
727// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
728// if (fPrintLevel >= 10) {
729// cout << "chamber (0...): " << ch <<
730// " cathcorrel (0...): " << cor << endl;
731// mCor->Dump();
732// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
733// hitForRec->Dump();}
734// } // end of cluster loop
735// } // end of chamber loop
736// return;
737// }
738
739 //__________________________________________________________________________
740void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
741{
742 // To add to the list of hits for reconstruction all the raw clusters
743 // No condition added, like in Fortran TRACKF_STAT,
744 // on the radius between RMin and RMax.
745 AliMUONHitForRec *hitForRec;
746 AliMUONRawCluster *clus;
f69d51b5 747 Int_t iclus, nclus, nTRentries;
a9e2aefa 748 TClonesArray *rawclusters;
749 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
88cb7938 750
e191bb57 751// TString evfoldname = AliConfig::GetDefaultEventFolderName();//to be interfaced properly
52c9bc11 752// AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
753// if (rl == 0x0)
754// {
755// Error("MakeEventToBeReconstructed",
756// "Can not find Run Loader in Event Folder named %s.",
757// evfoldname.Data());
758// return;
759// }
760// AliLoader* gime = rl->GetLoader("MUONLoader");
761// if (gime == 0x0)
762// {
763// Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
764// return;
765// }
766// // Loading AliRun master
767// rl->LoadgAlice();
768// gAlice = rl->GetAliRun();
88cb7938 769
770 // Loading MUON subsystem
52c9bc11 771 // AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
88cb7938 772
f69d51b5 773 nTRentries = Int_t(TR->GetEntries());
774 if (nTRentries != 1) {
775 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
776 << endl;
777 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
778 exit(0);
779 }
52c9bc11 780 fLoader->TreeR()->GetEvent(0); // only one entry
781
a9e2aefa 782 // Loop over tracking chambers
9cbdf048 783 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 784 // number of HitsForRec to 0 for the chamber
785 fNHitsForRecPerChamber[ch] = 0;
786 // index of first HitForRec for the chamber
787 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
788 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
52c9bc11 789 rawclusters =fMUONData->RawClusters(ch);
f69d51b5 790// pMUON->ResetRawClusters();
791// TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
a9e2aefa 792 nclus = (Int_t) (rawclusters->GetEntries());
793 // Loop over (cathode correlated) raw clusters
794 for (iclus = 0; iclus < nclus; iclus++) {
795 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
796 // new AliMUONHitForRec from raw cluster
797 // and increment number of AliMUONHitForRec's (total and in chamber)
798 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
799 fNHitsForRec++;
800 (fNHitsForRecPerChamber[ch])++;
801 // more information into HitForRec
802 // resolution: info should be already in raw cluster and taken from it ????
803 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
804 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
805 // original raw cluster
806 hitForRec->SetChamberNumber(ch);
807 hitForRec->SetHitNumber(iclus);
ba5b68db 808 // Z coordinate of the raw cluster (cm)
ba12c242 809 hitForRec->SetZ(clus->GetZ(0));
a9e2aefa 810 if (fPrintLevel >= 10) {
811 cout << "chamber (0...): " << ch <<
812 " raw cluster (0...): " << iclus << endl;
813 clus->Dump();
814 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
815 hitForRec->Dump();}
816 } // end of cluster loop
817 } // end of chamber loop
83dbc640 818 SortHitsForRecWithIncreasingChamber(); //AZ
a9e2aefa 819 return;
820}
821
822 //__________________________________________________________________________
823void AliMUONEventReconstructor::MakeSegments(void)
824{
825 // To make the list of segments in all stations,
826 // from the list of hits to be reconstructed
827 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
828 ResetSegments();
829 // Loop over stations
83dbc640 830 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
831 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
832 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
a9e2aefa 833 MakeSegmentsPerStation(st);
834 if (fPrintLevel >= 10) {
835 cout << "end of MakeSegments" << endl;
9cbdf048 836 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 837 cout << "station(0...): " << st
838 << " Segments: " << fNSegments[st]
839 << endl;
840 for (Int_t seg = 0;
841 seg < fNSegments[st];
842 seg++) {
843 cout << "Segment index(0...): " << seg << endl;
844 ((*fSegmentsPtr[st])[seg])->Dump();
845 }
846 }
847 }
848 return;
849}
850
851 //__________________________________________________________________________
852void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
853{
854 // To make the list of segments in station number "Station" (0...)
855 // from the list of hits to be reconstructed.
856 // Updates "fNSegments"[Station].
857 // Segments in stations 4 and 5 are sorted
858 // according to increasing absolute value of "impact parameter"
859 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
860 AliMUONSegment *segment;
861 Bool_t last2st;
862 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
d0bfce8d 863 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 864 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 865 if (fPrintLevel >= 1)
866 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
867 // first and second chambers (0...) in the station
868 Int_t ch1 = 2 * Station;
869 Int_t ch2 = ch1 + 1;
870 // variable true for stations downstream of the dipole:
871 // Station(0..4) equal to 3 or 4
872 if ((Station == 3) || (Station == 4)) {
873 last2st = kTRUE;
874 // maximum impact parameter (cm) according to fMinBendingMomentum...
875 maxImpactParam =
876 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
d0bfce8d 877 // minimum impact parameter (cm) according to fMaxBendingMomentum...
878 minImpactParam =
879 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
a9e2aefa 880 }
881 else last2st = kFALSE;
882 // extrapolation factor from Z of first chamber to Z of second chamber
883 // dZ to be changed to take into account fine structure of chambers ????
884 Double_t extrapFact =
9cbdf048 885 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 886 // index for current segment
887 Int_t segmentIndex = 0;
888 // Loop over HitsForRec in the first chamber of the station
889 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
890 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
891 hit1++) {
892 // pointer to the HitForRec
893 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
894 // extrapolation,
895 // on the straight line joining the HitForRec to the vertex (0,0,0),
896 // to the Z of the second chamber of the station
897 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
898 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
899 // Loop over HitsForRec in the second chamber of the station
900 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
901 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
902 hit2++) {
903 // pointer to the HitForRec
904 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
905 // absolute values of distances, in bending and non bending planes,
906 // between the HitForRec in the second chamber
907 // and the previous extrapolation
908 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
909 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
910 if (last2st) {
911 // bending slope
912 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
913 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
914 // absolute value of impact parameter
915 impactParam =
31817925 916 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
a9e2aefa 917 }
918 // check for distances not too large,
919 // and impact parameter not too big if stations downstream of the dipole.
920 // Conditions "distBend" and "impactParam" correlated for these stations ????
921 if ((distBend < fSegmentMaxDistBending[Station]) &&
922 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
d0bfce8d 923 (!last2st || (impactParam < maxImpactParam)) &&
924 (!last2st || (impactParam > minImpactParam))) {
a9e2aefa 925 // make new segment
926 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
927 AliMUONSegment(hit1Ptr, hit2Ptr);
928 // update "link" to this segment from the hit in the first chamber
929 if (hit1Ptr->GetNSegments() == 0)
930 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
931 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
932 if (fPrintLevel >= 10) {
933 cout << "segmentIndex(0...): " << segmentIndex
934 << " distBend: " << distBend
935 << " distNonBend: " << distNonBend
936 << endl;
937 segment->Dump();
938 cout << "HitForRec in first chamber" << endl;
939 hit1Ptr->Dump();
940 cout << "HitForRec in second chamber" << endl;
941 hit2Ptr->Dump();
942 };
943 // increment index for current segment
944 segmentIndex++;
945 }
946 } //for (Int_t hit2
947 } // for (Int_t hit1...
948 fNSegments[Station] = segmentIndex;
949 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
950 // i.e. Station(0..4) 3 or 4, using the function "Compare".
951 // After this sorting, it is impossible to use
952 // the "fNSegments" and "fIndexOfFirstSegment"
953 // of the HitForRec in the first chamber to explore all segments formed with it.
954 // Is this sorting really needed ????
955 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
956 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
957 << fNSegments[Station] << endl;
958 return;
959}
960
961 //__________________________________________________________________________
962void AliMUONEventReconstructor::MakeTracks(void)
963{
964 // To make the tracks,
965 // from the list of segments and points in all stations
966 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 967 // The order may be important for the following Reset's
a9e2aefa 968 ResetTracks();
8429a5e4 969 ResetTrackHits();
83dbc640 970 if (fTrackMethod == 2) { //AZ - Kalman filter
971 MakeTrackCandidatesK();
972 // Follow tracks in stations(1..) 3, 2 and 1
973 FollowTracksK();
974 // Remove double tracks
975 RemoveDoubleTracksK();
976 // Propagate tracks to the vertex thru absorber
977 GoToVertex();
d837040f 978 } else {
83dbc640 979 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
980 MakeTrackCandidates();
981 // Follow tracks in stations(1..) 3, 2 and 1
982 FollowTracks();
983 // Remove double tracks
984 RemoveDoubleTracks();
d837040f 985 UpdateTrackParamAtHit();
52c9bc11 986 }
a9e2aefa 987 return;
988}
989
276c44b7 990 //__________________________________________________________________________
d837040f 991void AliMUONEventReconstructor::ValidateTracksWithTrigger(void)
992{
993 AliMUONTrack *track;
24ab3324 994 TClonesArray *recTriggerTracks;
995
996 fMUONData->ResetRecTriggerTracks();
997 fMUONData->SetTreeAddress("RL");
998 fMUONData->GetRecTriggerTracks();
999 recTriggerTracks = fMUONData->RecTriggerTracks();
e8765288 1000
d837040f 1001 track = (AliMUONTrack*) fRecTracksPtr->First();
1002 while (track) {
1003 track->MatchTriggerTrack(recTriggerTracks);
1004 track = (AliMUONTrack*) fRecTracksPtr->After(track);
e8765288 1005 }
24ab3324 1006
d837040f 1007}
1008
1009 //__________________________________________________________________________
1010Bool_t AliMUONEventReconstructor::MakeTriggerTracks(void)
276c44b7 1011{
1012 // To make the trigger tracks from Local Trigger
1013 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
52c9bc11 1014 // ResetTriggerTracks();
276c44b7 1015
1016 Int_t nTRentries;
52c9bc11 1017 Long_t gloTrigPat;
276c44b7 1018 TClonesArray *localTrigger;
9131b4fe 1019 TClonesArray *globalTrigger;
276c44b7 1020 AliMUONLocalTrigger *locTrg;
9131b4fe 1021 AliMUONGlobalTrigger *gloTrg;
276c44b7 1022 AliMUONTriggerCircuit *circuit;
52c9bc11 1023 AliMUONTriggerTrack *recTriggerTrack = 0;
d837040f 1024
52c9bc11 1025 TTree* TR = fLoader->TreeR();
276c44b7 1026
276c44b7 1027 // Loading MUON subsystem
1028 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1029
1030 nTRentries = Int_t(TR->GetEntries());
d837040f 1031
1032 TR->GetEvent(0); // only one entry
1033
1034 if (!(fMUONData->IsTriggerBranchesInTree())) {
1035 cout << "Warning in AliMUONEventReconstructor::MakeTriggerTracks"
52c9bc11 1036 << endl;
d837040f 1037 cout << "Trigger information is not avalaible, nTRentries = " << nTRentries << " not equal to 1" << endl;
1038 return kFALSE;
276c44b7 1039 }
276c44b7 1040
52c9bc11 1041 fMUONData->SetTreeAddress("GLT");
1042 fMUONData->GetTrigger();
9131b4fe 1043
52c9bc11 1044 // global trigger for trigger pattern
9131b4fe 1045 gloTrigPat = 0;
52c9bc11 1046 globalTrigger = fMUONData->GlobalTrigger();
9131b4fe 1047 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1048 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1049 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1050 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1051
1052 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1053 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1054 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1055
1056 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1057 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1058 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1059
1060 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1061 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1062 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1063
1064 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1065 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1066 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1067
52c9bc11 1068
1069
1070 // local trigger for tracking
1071 localTrigger = fMUONData->LocalTrigger();
276c44b7 1072 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1073 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1074 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1075
1076 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
52c9bc11 1077 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1078 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1079 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
aeb4f510 1080 Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
1081 Float_t y21 = circuit->GetY21Pos(stripX21);
52c9bc11 1082 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1083 Float_t thetax = TMath::ATan2( x11 , z11 );
1084 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1085
1086 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1087 // since static statement does not work, set gloTrigPat for each track
1088
1089 // fNRecTriggerTracks++;
1090 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
276c44b7 1091 } // end of loop on Local Trigger
d837040f 1092 return kTRUE;
276c44b7 1093}
1094
a9e2aefa 1095 //__________________________________________________________________________
1096Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1097{
1098 // To make track candidates with two segments in stations(1..) 4 and 5,
1099 // the first segment being pointed to by "BegSegment".
1100 // Returns the number of such track candidates.
1101 Int_t endStation, iEndSegment, nbCan2Seg;
1102 AliMUONSegment *endSegment, *extrapSegment;
1103 AliMUONTrack *recTrack;
1104 Double_t mcsFactor;
1105 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1106 // Station for the end segment
1107 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1108 // multiple scattering factor corresponding to one chamber
1109 mcsFactor = 0.0136 /
1110 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1111 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1112 // linear extrapolation to end station
1113 extrapSegment =
1114 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
1115 // number of candidates with 2 segments to 0
1116 nbCan2Seg = 0;
1117 // Loop over segments in the end station
1118 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1119 // pointer to segment
1120 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1121 // test compatibility between current segment and "extrapSegment"
04b5ea16 1122 // 4 because 4 quantities in chi2
a9e2aefa 1123 if ((endSegment->
1124 NormalizedChi2WithSegment(extrapSegment,
1125 fMaxSigma2Distance)) <= 4.0) {
1126 // both segments compatible:
1127 // make track candidate from "begSegment" and "endSegment"
1128 if (fPrintLevel >= 2)
1129 cout << "TrackCandidate with Segment " << iEndSegment <<
1130 " in Station(0..) " << endStation << endl;
1131 // flag for both segments in one track:
1132 // to be done in track constructor ????
1133 BegSegment->SetInTrack(kTRUE);
1134 endSegment->SetInTrack(kTRUE);
1135 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1136 AliMUONTrack(BegSegment, endSegment, this);
1137 fNRecTracks++;
1138 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1139 // increment number of track candidates with 2 segments
1140 nbCan2Seg++;
1141 }
1142 } // for (iEndSegment = 0;...
1143 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1144 return nbCan2Seg;
1145}
1146
1147 //__________________________________________________________________________
1148Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1149{
1150 // To make track candidates with one segment and one point
1151 // in stations(1..) 4 and 5,
1152 // the segment being pointed to by "BegSegment".
1153 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1154 AliMUONHitForRec *extrapHitForRec, *hit;
1155 AliMUONTrack *recTrack;
1156 Double_t mcsFactor;
1157 if (fPrintLevel >= 1)
1158 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1159 // station for the end point
1160 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1161 // multiple scattering factor corresponding to one chamber
1162 mcsFactor = 0.0136 /
1163 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1164 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1165 // first and second chambers(0..) in the end station
1166 ch1 = 2 * endStation;
1167 ch2 = ch1 + 1;
1168 // number of candidates to 0
1169 nbCan1Seg1Hit = 0;
1170 // Loop over chambers of the end station
1171 for (ch = ch2; ch >= ch1; ch--) {
1172 // linear extrapolation to chamber
1173 extrapHitForRec =
1174 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1175 // limits for the hit index in the loop
1176 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1177 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1178 // Loop over HitForRec's in the chamber
1179 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1180 // pointer to HitForRec
1181 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1182 // test compatibility between current HitForRec and "extrapHitForRec"
04b5ea16 1183 // 2 because 2 quantities in chi2
a9e2aefa 1184 if ((hit->
1185 NormalizedChi2WithHitForRec(extrapHitForRec,
1186 fMaxSigma2Distance)) <= 2.0) {
1187 // both HitForRec's compatible:
1188 // make track candidate from begSegment and current HitForRec
1189 if (fPrintLevel >= 2)
1190 cout << "TrackCandidate with HitForRec " << iHit <<
1191 " in Chamber(0..) " << ch << endl;
1192 // flag for beginning segments in one track:
1193 // to be done in track constructor ????
1194 BegSegment->SetInTrack(kTRUE);
1195 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1196 AliMUONTrack(BegSegment, hit, this);
1197 // the right place to eliminate "double counting" ???? how ????
1198 fNRecTracks++;
1199 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1200 // increment number of track candidates
1201 nbCan1Seg1Hit++;
1202 }
1203 } // for (iHit = iHitMin;...
1204 delete extrapHitForRec;
1205 } // for (ch = ch2;...
1206 return nbCan1Seg1Hit;
1207}
1208
1209 //__________________________________________________________________________
1210void AliMUONEventReconstructor::MakeTrackCandidates(void)
1211{
1212 // To make track candidates
1213 // with at least 3 aligned points in stations(1..) 4 and 5
1214 // (two Segment's or one Segment and one HitForRec)
1215 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1216 AliMUONSegment *begSegment;
1217 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1218 // Loop over stations(1..) 5 and 4 for the beginning segment
1219 for (begStation = 4; begStation > 2; begStation--) {
1220 // Loop over segments in the beginning station
1221 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1222 // pointer to segment
1223 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1224 if (fPrintLevel >= 2)
1225 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1226 " in Station(0..) " << begStation << endl;
1227 // Look for track candidates with two segments,
1228 // "begSegment" and all compatible segments in other station.
1229 // Only for beginning station(1..) 5
1230 // because candidates with 2 segments have to looked for only once.
1231 if (begStation == 4)
1232 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
956019b6 1233 // Look for track candidates with one segment and one point,
a9e2aefa 1234 // "begSegment" and all compatible HitForRec's in other station.
1235 // Only if "begSegment" does not belong already to a track candidate.
1236 // Is that a too strong condition ????
1237 if (!(begSegment->GetInTrack()))
1238 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1239 } // for (iBegSegment = 0;...
1240 } // for (begStation = 4;...
1241 return;
1242}
1243
1244 //__________________________________________________________________________
1245void AliMUONEventReconstructor::FollowTracks(void)
1246{
1247 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1248 // too long: should be made more modular !!!!
d0bfce8d 1249 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1250 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
04b5ea16 1251 AliMUONTrack *track, *nextTrack;
1252 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1253 // -1 to avoid compilation warnings
1254 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1255 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
d0bfce8d 1256 Double_t bendingMomentum, chi2Norm = 0.;
9cbdf048 1257 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1258 // local maxSigma2Distance, for easy increase in testing
1259 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1260 if (fPrintLevel >= 2)
1261 cout << "enter FollowTracks" << endl;
1262 // Loop over track candidates
04b5ea16 1263 track = (AliMUONTrack*) fRecTracksPtr->First();
1264 trackIndex = -1;
1265 while (track) {
1266 // Follow function for each track candidate ????
1267 trackIndex++;
1268 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1269 if (fPrintLevel >= 2)
1270 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 1271 // Fit track candidate
1272 track->SetFitMCS(0); // without multiple Coulomb scattering
1273 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1274 track->SetFitStart(0); // from parameters at vertex
1275 track->Fit();
a9e2aefa 1276 if (fPrintLevel >= 10) {
1277 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1278 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1279 track->RecursiveDump();
1280 }
1281 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1282 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1283 // otherwise: majority coincidence 2 !!!!
a9e2aefa 1284 for (station = 2; station >= 0; station--) {
1285 // Track parameters at first track hit (smallest Z)
1286 trackParam1 = ((AliMUONTrackHit*)
1287 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1288 // extrapolation to station
1289 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 1290 extrapSegment = new AliMUONSegment(); // empty segment
d0bfce8d 1291 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
a9e2aefa 1292 // multiple scattering factor corresponding to one chamber
1293 // and momentum in bending plane (not total)
1294 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1295 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1296 // Z difference from previous station
9cbdf048 1297 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1298 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1299 // Z difference between the two previous stations
9cbdf048 1300 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1301 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 1302 // Z difference between the two chambers in the previous station
1303 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1304 (&(pMUON->Chamber(2 * station + 1)))->Z();
1305 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1306 extrapSegment->
1307 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1308 extrapSegment->UpdateFromStationTrackParam
1309 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1310 trackParam1->GetInverseBendingMomentum());
d0bfce8d 1311 // same thing for corrected segment
1312 // better to use copy constructor, after checking that it works properly !!!!
1313 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1314 extrapCorrSegment->
1315 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1316 extrapCorrSegment->UpdateFromStationTrackParam
1317 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1318 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1319 bestChi2 = 5.0;
1320 bestSegment = NULL;
1321 if (fPrintLevel >= 10) {
1322 cout << "FollowTracks: track candidate(0..): " << trackIndex
1323 << " Look for segment in station(0..): " << station << endl;
1324 }
1325 // Loop over segments in station
1326 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1327 // Look for best compatible Segment in station
1328 // should consider all possibilities ????
1329 // multiple scattering ????
1330 // separation in 2 functions: Segment and HitForRec ????
1331 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
d0bfce8d 1332 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1333 // according to real Z value of "segment" and slopes of "extrapSegment"
1334 extrapCorrSegment->
1335 SetBendingCoor(extrapSegment->GetBendingCoor() +
1336 extrapSegment->GetBendingSlope() *
1337 (segment->GetHitForRec1()->GetZ() -
1338 (&(pMUON->Chamber(2 * station)))->Z()));
1339 extrapCorrSegment->
1340 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1341 extrapSegment->GetNonBendingSlope() *
1342 (segment->GetHitForRec1()->GetZ() -
1343 (&(pMUON->Chamber(2 * station)))->Z()));
1344 chi2 = segment->
1345 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
a9e2aefa 1346 if (chi2 < bestChi2) {
1347 // update best Chi2 and Segment if better found
1348 bestSegment = segment;
1349 bestChi2 = chi2;
1350 }
1351 }
1352 if (bestSegment) {
1353 // best segment found: add it to track candidate
1354 track->AddSegment(bestSegment);
1355 // set track parameters at these two TrakHit's
1356 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1357 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1358 if (fPrintLevel >= 10) {
1359 cout << "FollowTracks: track candidate(0..): " << trackIndex
1360 << " Added segment in station(0..): " << station << endl;
1361 track->RecursiveDump();
1362 }
1363 }
1364 else {
1365 // No best segment found:
1366 // Look for best compatible HitForRec in station:
1367 // should consider all possibilities ????
1368 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1369 extrapHit = new AliMUONHitForRec(); // empty hit
d0bfce8d 1370 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
a9e2aefa 1371 bestChi2 = 3.0;
1372 bestHit = NULL;
1373 if (fPrintLevel >= 10) {
1374 cout << "FollowTracks: track candidate(0..): " << trackIndex
1375 << " Segment not found, look for hit in station(0..): " << station
1376 << endl;
1377 }
1378 // Loop over chambers of the station
d82671a0 1379 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1380 // coordinates of extrapolated hit
d82671a0 1381 extrapHit->
1382 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1383 extrapHit->
1384 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1385 // resolutions from "extrapSegment"
1386 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1387 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
d0bfce8d 1388 // same things for corrected hit
1389 // better to use copy constructor, after checking that it works properly !!!!
1390 extrapCorrHit->
1391 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1392 extrapCorrHit->
1393 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1394 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1395 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
a9e2aefa 1396 // Loop over hits in the chamber
956019b6 1397 ch = 2 * station + chInStation;
a9e2aefa 1398 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1399 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1400 fNHitsForRecPerChamber[ch];
1401 iHit++) {
1402 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
d0bfce8d 1403 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1404 // according to real Z value of "hit" and slopes of right "trackParam"
1405 extrapCorrHit->
1406 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1407 (&(trackParam[chInStation]))->GetBendingSlope() *
1408 (hit->GetZ() -
1409 (&(trackParam[chInStation]))->GetZ()));
1410 extrapCorrHit->
1411 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1412 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1413 (hit->GetZ() -
1414 (&(trackParam[chInStation]))->GetZ()));
a9e2aefa 1415 // condition for hit not already in segment ????
1416 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1417 if (chi2 < bestChi2) {
1418 // update best Chi2 and HitForRec if better found
1419 bestHit = hit;
1420 bestChi2 = chi2;
d82671a0 1421 chBestHit = chInStation;
a9e2aefa 1422 }
1423 }
1424 }
1425 if (bestHit) {
1426 // best hit found: add it to track candidate
1427 track->AddHitForRec(bestHit);
956019b6 1428 // set track parameters at this TrackHit
a9e2aefa 1429 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1430 &(trackParam[chBestHit]));
1431 if (fPrintLevel >= 10) {
1432 cout << "FollowTracks: track candidate(0..): " << trackIndex
1433 << " Added hit in station(0..): " << station << endl;
1434 track->RecursiveDump();
1435 }
1436 }
1437 else {
8429a5e4 1438 // Remove current track candidate
1439 // and corresponding TrackHit's, ...
1440 track->Remove();
04b5ea16 1441 delete extrapSegment;
d0bfce8d 1442 delete extrapCorrSegment;
1443 delete extrapHit;
1444 delete extrapCorrHit;
a9e2aefa 1445 break; // stop the search for this candidate:
1446 // exit from the loop over station
1447 }
d0bfce8d 1448 delete extrapHit;
1449 delete extrapCorrHit;
a9e2aefa 1450 }
04b5ea16 1451 delete extrapSegment;
d0bfce8d 1452 delete extrapCorrSegment;
a9e2aefa 1453 // Sort track hits according to increasing Z
1454 track->GetTrackHitsPtr()->Sort();
1455 // Update track parameters at first track hit (smallest Z)
1456 trackParam1 = ((AliMUONTrackHit*)
1457 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
d0bfce8d 1458 bendingMomentum = 0.;
1459 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1460 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1461 // Track removed if bendingMomentum not in window [min, max]
1462 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1463 track->Remove();
1464 break; // stop the search for this candidate:
1465 // exit from the loop over station
1466 }
956019b6 1467 // Track fit
04b5ea16 1468 // with multiple Coulomb scattering if all stations
1469 if (station == 0) track->SetFitMCS(1);
956019b6 1470 // without multiple Coulomb scattering if not all stations
04b5ea16 1471 else track->SetFitMCS(0);
956019b6 1472 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1473 track->SetFitStart(1); // from parameters at first hit
1474 track->Fit();
d0bfce8d 1475 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1476 if (numberOfDegFree > 0) {
1477 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1478 } else {
1479 chi2Norm = 1.e10;
1480 }
1481 // Track removed if normalized chi2 too high
1482 if (chi2Norm > fMaxChi2) {
1483 track->Remove();
1484 break; // stop the search for this candidate:
1485 // exit from the loop over station
1486 }
a9e2aefa 1487 if (fPrintLevel >= 10) {
1488 cout << "FollowTracks: track candidate(0..): " << trackIndex
1489 << " after fit from station(0..): " << station << " to 4" << endl;
1490 track->RecursiveDump();
1491 }
04b5ea16 1492 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1493 // after going through the first station
04b5ea16 1494 if (station == 0) {
1495 trackParamVertex = *trackParam1;
1496 (&trackParamVertex)->ExtrapToVertex();
1497 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1498 if (fPrintLevel >= 1) {
1499 cout << "FollowTracks: track candidate(0..): " << trackIndex
1500 << " after extrapolation to vertex" << endl;
1501 track->RecursiveDump();
1502 }
04b5ea16 1503 }
a9e2aefa 1504 } // for (station = 2;...
04b5ea16 1505 // go really to next track
1506 track = nextTrack;
1507 } // while (track)
1508 // Compression of track array (necessary after Remove ????)
1509 fRecTracksPtr->Compress();
1510 return;
1511}
1512
1513 //__________________________________________________________________________
8429a5e4 1514void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1515{
1516 // To remove double tracks.
1517 // Tracks are considered identical
1518 // if they have at least half of their hits in common.
1519 // Among two identical tracks, one keeps the track with the larger number of hits
1520 // or, if these numbers are equal, the track with the minimum Chi2.
1521 AliMUONTrack *track1, *track2, *trackToRemove;
1522 Bool_t identicalTracks;
1523 Int_t hitsInCommon, nHits1, nHits2;
1524 identicalTracks = kTRUE;
1525 while (identicalTracks) {
1526 identicalTracks = kFALSE;
1527 // Loop over first track of the pair
1528 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1529 while (track1 && (!identicalTracks)) {
1530 nHits1 = track1->GetNTrackHits();
1531 // Loop over second track of the pair
1532 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1533 while (track2 && (!identicalTracks)) {
1534 nHits2 = track2->GetNTrackHits();
1535 // number of hits in common between two tracks
1536 hitsInCommon = track1->HitsInCommon(track2);
1537 // check for identical tracks
1538 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1539 identicalTracks = kTRUE;
1540 // decide which track to remove
1541 if (nHits1 > nHits2) trackToRemove = track2;
1542 else if (nHits1 < nHits2) trackToRemove = track1;
1543 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1544 trackToRemove = track2;
1545 else trackToRemove = track1;
1546 // remove it
1547 trackToRemove->Remove();
1548 }
1549 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1550 } // track2
1551 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1552 } // track1
1553 }
1554 return;
1555}
1556
d837040f 1557 //__________________________________________________________________________
1558void AliMUONEventReconstructor::UpdateTrackParamAtHit()
1559{
1560 // Set track parameters after track fitting. Fill fTrackParamAtHit of AliMUONTrack's
1561 AliMUONTrack *track;
1562 AliMUONTrackHit *trackHit;
1563 AliMUONTrackParam *trackParam;
1564 track = (AliMUONTrack*) fRecTracksPtr->First();
1565 while (track) {
1566 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->First();
1567 while (trackHit) {
1568 trackParam = trackHit->GetTrackParam();
1569 track->AddTrackParamAtHit(trackParam);
1570 trackHit = (AliMUONTrackHit*) (track->GetTrackHitsPtr())->After(trackHit);
1571 } // trackHit
1572 track = (AliMUONTrack*) fRecTracksPtr->After(track);
1573 } // track
1574 return;
1575}
1576
8429a5e4 1577 //__________________________________________________________________________
04b5ea16 1578void AliMUONEventReconstructor::EventDump(void)
1579{
1580 // Dump reconstructed event (track parameters at vertex and at first hit),
1581 // and the particle parameters
1582
1583 AliMUONTrack *track;
1584 AliMUONTrackParam *trackParam, *trackParam1;
04b5ea16 1585 Double_t bendingSlope, nonBendingSlope, pYZ;
1586 Double_t pX, pY, pZ, x, y, z, c;
1587 Int_t np, trackIndex, nTrackHits;
1588
1589 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1590 if (fPrintLevel >= 1) {
1591 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1592 }
1593 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1594 // Loop over reconstructed tracks
1595 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
83dbc640 1596 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
04b5ea16 1597 if (fPrintLevel >= 1)
1598 cout << " track number: " << trackIndex << endl;
1599 // function for each track for modularity ????
1600 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1601 nTrackHits = track->GetNTrackHits();
1602 if (fPrintLevel >= 1)
1603 cout << " number of track hits: " << nTrackHits << endl;
1604 // track parameters at Vertex
1605 trackParam = track->GetTrackParamAtVertex();
1606 x = trackParam->GetNonBendingCoor();
1607 y = trackParam->GetBendingCoor();
1608 z = trackParam->GetZ();
1609 bendingSlope = trackParam->GetBendingSlope();
1610 nonBendingSlope = trackParam->GetNonBendingSlope();
1611 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1612 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1613 pX = pZ * nonBendingSlope;
1614 pY = pZ * bendingSlope;
1615 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1616 if (fPrintLevel >= 1)
1617 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1618 z, x, y, pX, pY, pZ, c);
1619
1620 // track parameters at first hit
1621 trackParam1 = ((AliMUONTrackHit*)
1622 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1623 x = trackParam1->GetNonBendingCoor();
1624 y = trackParam1->GetBendingCoor();
1625 z = trackParam1->GetZ();
1626 bendingSlope = trackParam1->GetBendingSlope();
1627 nonBendingSlope = trackParam1->GetNonBendingSlope();
1628 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1629 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1630 pX = pZ * nonBendingSlope;
1631 pY = pZ * bendingSlope;
1632 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1633 if (fPrintLevel >= 1)
1634 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1635 z, x, y, pX, pY, pZ, c);
1636 }
1637 // informations about generated particles
5d12ce38 1638 np = gAlice->GetMCApp()->GetNtrack();
04b5ea16 1639 printf(" **** number of generated particles: %d \n", np);
1640
88cb7938 1641// for (Int_t iPart = 0; iPart < np; iPart++) {
1642// p = gAlice->Particle(iPart);
1643// printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1644// iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1645// }
a9e2aefa 1646 return;
1647}
1648
276c44b7 1649
1650//__________________________________________________________________________
1651void AliMUONEventReconstructor::EventDumpTrigger(void)
1652{
1653 // Dump reconstructed trigger event
1654 // and the particle parameters
1655
52c9bc11 1656 AliMUONTriggerTrack *triggertrack ;
1657 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
276c44b7 1658
276c44b7 1659 if (fPrintLevel >= 1) {
52c9bc11 1660 cout << "****** enter EventDumpTrigger ******" << endl;
1661 cout << " Number of Reconstructed tracks :" << nTriggerTracks << endl;
276c44b7 1662 }
1663 // Loop over reconstructed tracks
52c9bc11 1664 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1665 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
276c44b7 1666 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1667 trackIndex,
1668 triggertrack->GetX11(),triggertrack->GetY11(),
1669 triggertrack->GetThetax(),triggertrack->GetThetay());
1670 }
1671}
1672
1673//__________________________________________________________________________
c7ba256d 1674void AliMUONEventReconstructor::FillEvent()
1675{
1676// Create a new AliMUONRecoEvent, fill its track list, then add it as a
1677// leaf in the Event branch of TreeRecoEvent tree
1678 cout << "Enter FillEvent() ...\n";
1679
1680 if (!fRecoEvent) {
1681 fRecoEvent = new AliMUONRecoEvent();
1682 } else {
1683 fRecoEvent->Clear();
1684 }
1685 //save current directory
1686 TDirectory *current = gDirectory;
1687 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1688 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
83dbc640 1689 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1690 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
c7ba256d 1691 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1692 TBranch *branch = fEventTree->GetBranch("Event");
d0f40f23 1693 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
c7ba256d 1694 branch->SetAutoDelete();
1695 fTreeFile->cd();
1696 fEventTree->Fill();
1697 fTreeFile->Write();
1698 }
1699 // restore directory
1700 current->cd();
1701}
83dbc640 1702
1703//__________________________________________________________________________
1704void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1705{
1706 // To make initial tracks for Kalman filter from the list of segments
1707 Int_t istat, iseg;
1708 AliMUONSegment *segment;
1709 AliMUONTrackK *trackK;
1710
1711 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1712 // Reset the TClonesArray of reconstructed tracks
1713 if (fRecTracksPtr) fRecTracksPtr->Delete();
1714 // Delete in order that the Track destructors are called,
1715 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1716 fNRecTracks = 0;
1717
1718 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1719 // Loop over stations(1...) 5 and 4
1720 for (istat=4; istat>=3; istat--) {
1721 // Loop over segments in the station
1722 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1723 // Transform segments to tracks and evaluate covariance matrix
1724 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1725 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1726 fNRecTracks++;
1727 } // for (iseg=0;...)
1728 } // for (istat=4;...)
1729 return;
1730}
1731
1732//__________________________________________________________________________
1733void AliMUONEventReconstructor::FollowTracksK(void)
1734{
1735 // Follow tracks using Kalman filter
1736 Bool_t Ok;
1737 Int_t icand, ichamBeg, ichamEnd, chamBits;
1738 Double_t zDipole1, zDipole2;
1739 AliMUONTrackK *trackK;
1740 AliMUONHitForRec *hit;
1741 AliMUONRawCluster *clus;
1742 TClonesArray *rawclusters;
1743 AliMUON *pMUON;
1744 clus = 0; rawclusters = 0;
1745
1746 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1747 zDipole2 = zDipole1 + GetSimpleBLength();
1748
1749 // Print hits
1750 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1751 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1752 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1753 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1754 /*
1755 cout << " Hit #" << hit->GetChamberNumber() << " ";
1756 cout << hit->GetBendingCoor() << " ";
1757 cout << hit->GetNonBendingCoor() << " ";
1758 cout << hit->GetZ() << " ";
1759 cout << hit->GetGeantSignal() << " ";
1760 cout << hit->GetTHTrack() << endl;
1761 */
1762 /*
1763 printf(" Hit # %d %10.4f %10.4f %10.4f",
1764 hit->GetChamberNumber(), hit->GetBendingCoor(),
1765 hit->GetNonBendingCoor(), hit->GetZ());
1766 if (fRecGeantHits) {
1767 // from GEANT hits
1768 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1769 } else {
1770 // from raw clusters
1771 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1772 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1773 GetHitNumber());
1774 printf("%3d", clus->fTracks[1]-1);
1775 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1776 else printf("\n");
1777 }
1778 */
1779 }
1780
1781 icand = -1;
1782 Int_t nSeeds = fNRecTracks; // starting number of seeds
1783 // Loop over track candidates
1784 while (icand < fNRecTracks-1) {
1785 icand ++;
1786 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1787
1788 // Discard candidate which will produce the double track
1789 if (icand > 0) {
1790 Ok = CheckCandidateK(icand,nSeeds);
1791 if (!Ok) {
1792 //trackK->SetRecover(-1); // mark candidate to be removed
1793 //continue;
1794 }
1795 }
1796
1797 Ok = kTRUE;
1798 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1799 trackK->GetHitOnTrack()->Last(); // last hit
1800 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1801 ichamBeg = hit->GetChamberNumber();
1802 ichamEnd = 0;
1803 // Check propagation direction
1804 if (trackK->GetTrackDir() > 0) {
1805 ichamEnd = 9; // forward propagation
1806 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1807 if (Ok) {
1808 ichamBeg = ichamEnd;
1809 ichamEnd = 6; // backward propagation
1810 // Change weight matrix and zero fChi2 for backpropagation
1811 trackK->StartBack();
1812 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1813 ichamBeg = ichamEnd;
1814 ichamEnd = 0;
1815 }
1816 } else {
1817 if (trackK->GetBPFlag()) {
1818 // backpropagation
1819 ichamEnd = 6; // backward propagation
1820 // Change weight matrix and zero fChi2 for backpropagation
1821 trackK->StartBack();
1822 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1823 ichamBeg = ichamEnd;
1824 ichamEnd = 0;
1825 }
1826 }
1827
1828 if (Ok) {
1829 trackK->SetTrackDir(-1);
1830 trackK->SetBPFlag(kFALSE);
1831 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1832 }
1833 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1834 else trackK->SetRecover(-1); // mark candidate to be removed
1835
1836 // Majority 3 of 4 in first 2 stations
1837 chamBits = 0;
1838 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1839 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1840 chamBits |= BIT(hit->GetChamberNumber()-1);
1841 }
1842 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1843 //mark candidate to be removed
1844 } // while
1845
1846 for (Int_t i=0; i<fNRecTracks; i++) {
1847 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1848 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1849 }
1850
1851 // Compress TClonesArray
1852 fRecTracksPtr->Compress();
1853 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1854 return;
1855}
1856
1857//__________________________________________________________________________
1858Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1859{
1860 // Discards track candidate if it will produce the double track (having
1861 // the same seed segment hits as hits of a good track found before)
1862 AliMUONTrackK *track1, *track2;
1863 AliMUONHitForRec *hit1, *hit2, *hit;
1864
1865 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1866 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1867 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1868
1869 for (Int_t i=0; i<icand; i++) {
1870 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1871 //if (track2->GetRecover() < 0) continue;
1872 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1873
1874 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1875 return kFALSE;
1876 } else {
1877 Int_t nSame = 0;
1878 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1879 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1880 if (hit == hit1 || hit == hit2) {
1881 nSame++;
1882 if (nSame == 2) return kFALSE;
1883 }
1884 } // for (Int_t j=0;
1885 }
1886 } // for (Int_t i=0;
1887 return kTRUE;
1888}
1889
1890//__________________________________________________________________________
1891void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1892{
1893 // Removes double tracks (sharing more than half of their hits). Keeps
1894 // the track with higher quality
1895 AliMUONTrackK *track1, *track2, *trackToKill;
1896
1897 // Sort tracks according to their quality
1898 fRecTracksPtr->Sort();
1899
1900 // Loop over first track of the pair
1901 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1902 while (track1) {
1903 // Loop over second track of the pair
1904 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1905 while (track2) {
1906 // Check whether or not to keep track2
1907 if (!track2->KeepTrack(track1)) {
1908 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1909 " " << track2->GetTrackQuality() << endl;
1910 trackToKill = track2;
1911 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1912 trackToKill->Kill();
1913 fRecTracksPtr->Compress();
1914 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1915 } // track2
1916 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1917 } // track1
1918
1919 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1920 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1921}
1922
1923//__________________________________________________________________________
1924void AliMUONEventReconstructor::GoToVertex(void)
1925{
1926 // Propagates track to the vertex thru absorber
1927 // (using Branson correction for now)
1928
1929 Double_t zVertex;
1930 zVertex = 0;
1931 for (Int_t i=0; i<fNRecTracks; i++) {
1932 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1933 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1934 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1935 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber
1936 }
1937}