Tracks reconstruction using NewIO
[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"
3831f268 41#include "AliMUONChamber.h"
42#include "AliMUONEventReconstructor.h"
a9e2aefa 43#include "AliMUONHitForRec.h"
a9e2aefa 44#include "AliMUONRawCluster.h"
3831f268 45#include "AliMUONRecoEvent.h"
46#include "AliMUONSegment.h"
a9e2aefa 47#include "AliMUONTrack.h"
a9e2aefa 48#include "AliMUONTrackHit.h"
94de3818 49#include "AliMagF.h"
3831f268 50#include "AliRun.h" // for gAlice
88cb7938 51#include "AliConfig.h"
52#include "AliRunLoader.h"
53#include "AliLoader.h"
83dbc640 54#include "AliMUONTrackK.h" //AZ
55#include <TMatrixD.h> //AZ
a9e2aefa 56
a9e2aefa 57//************* Defaults parameters for reconstruction
9cbdf048 58static const Double_t kDefaultMinBendingMomentum = 3.0;
d0bfce8d 59static const Double_t kDefaultMaxBendingMomentum = 500.0;
60static const Double_t kDefaultMaxChi2 = 100.0;
9cbdf048 61static const Double_t kDefaultMaxSigma2Distance = 16.0;
62static const Double_t kDefaultBendingResolution = 0.01;
63static const Double_t kDefaultNonBendingResolution = 0.144;
64static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 65// Simple magnetic field:
66// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
67// Length and Position from reco_muon.F, with opposite sign:
68// Length = ZMAGEND-ZCOIL
69// Position = (ZMAGEND+ZCOIL)/2
70// to be ajusted differently from real magnetic field ????
9cbdf048 71static const Double_t kDefaultSimpleBValue = 7.0;
72static const Double_t kDefaultSimpleBLength = 428.0;
73static const Double_t kDefaultSimpleBPosition = 1019.0;
74static const Int_t kDefaultRecGeantHits = 0;
75static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 76
9cbdf048 77static const Int_t kDefaultPrintLevel = 0;
a9e2aefa 78
79ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
80
81 //__________________________________________________________________________
82AliMUONEventReconstructor::AliMUONEventReconstructor(void)
83{
84 // Constructor for class AliMUONEventReconstructor
85 SetReconstructionParametersToDefaults();
83dbc640 86 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
a9e2aefa 87 // Memory allocation for the TClonesArray of hits for reconstruction
88 // Is 10000 the right size ????
89 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
90 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
91 // Memory allocation for the TClonesArray's of segments in stations
92 // Is 2000 the right size ????
9cbdf048 93 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 94 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
95 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
96 }
97 // Memory allocation for the TClonesArray of reconstructed tracks
98 // Is 10 the right size ????
99 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
100 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
8429a5e4 101 // Memory allocation for the TClonesArray of hits on reconstructed tracks
102 // Is 100 the right size ????
103 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
104 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
a9e2aefa 105
065bd0e1 106 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
a6f03ddb 107 Float_t b[3], x[3];
108 x[0] = 50.; x[1] = 50.; x[2] = 950.;
109 gAlice->Field()->Field(x, b);
065bd0e1 110 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
a6f03ddb 111 // See how to get fSimple(BValue, BLength, BPosition)
112 // automatically calculated from the actual magnetic field ????
a9e2aefa 113
114 if (fPrintLevel >= 0) {
a6f03ddb 115 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
116 cout << endl << "Magnetic field from root file:" << endl;
117 gAlice->Field()->Dump();
118 cout << endl;
119 }
c7ba256d 120
47a6b602 121 // Initializions for GEANT background events
122 fBkgGeantFile = 0;
123 fBkgGeantTK = 0;
124 fBkgGeantParticles = 0;
125 fBkgGeantTH = 0;
126 fBkgGeantHits = 0;
127 fBkgGeantEventNumber = -1;
128
c7ba256d 129 // Initialize to 0 pointers to RecoEvent, tree and tree file
130 fRecoEvent = 0;
131 fEventTree = 0;
132 fTreeFile = 0;
133
a9e2aefa 134 return;
135}
136
d9a3473d 137AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
9cbdf048 138{
139 // Dummy copy constructor
140}
141
d9a3473d 142AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
9cbdf048 143{
144 // Dummy assignment operator
145 return *this;
146}
147
a9e2aefa 148 //__________________________________________________________________________
149AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
150{
151 // Destructor for class AliMUONEventReconstructor
c7ba256d 152 if (fTreeFile) {
153 fTreeFile->Close();
154 delete fTreeFile;
155 }
156// if (fEventTree) delete fEventTree;
157 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 158 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 159 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 160 delete fSegmentsPtr[st]; // Correct destruction of everything ????
161 return;
162}
163
164 //__________________________________________________________________________
165void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
166{
167 // Set reconstruction parameters to default values
168 // Would be much more convenient with a structure (or class) ????
9cbdf048 169 fMinBendingMomentum = kDefaultMinBendingMomentum;
d0bfce8d 170 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
171 fMaxChi2 = kDefaultMaxChi2;
9cbdf048 172 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 173
9cbdf048 174 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 175 // ******** Parameters for making HitsForRec
176 // minimum radius,
177 // like in TRACKF_STAT:
178 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
179 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
9cbdf048 180 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
181 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 182 2.0 * TMath::Pi() / 180.0;
183 else fRMin[ch] = 30.0;
d0bfce8d 184 // maximum radius at 10 degrees and Z of chamber
185 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
186 10.0 * TMath::Pi() / 180.0;
a9e2aefa 187 }
a9e2aefa 188
189 // ******** Parameters for making segments
190 // should be parametrized ????
191 // according to interval between chambers in a station ????
192 // Maximum distance in non bending plane
193 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
194 // SIGCUT*DYMAX(IZ)
9cbdf048 195 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 196 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 197 // Maximum distance in bending plane:
198 // values from TRACKF_STAT, corresponding to (J psi 20cm),
199 // scaled to the real distance between chambers in a station
200 fSegmentMaxDistBending[0] = 1.5 *
201 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0;
202 fSegmentMaxDistBending[1] = 1.5 *
203 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0;
204 fSegmentMaxDistBending[2] = 3.0 *
205 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0;
206 fSegmentMaxDistBending[3] = 6.0 *
207 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0;
208 fSegmentMaxDistBending[4] = 6.0 *
209 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0;
a9e2aefa 210
9cbdf048 211 fBendingResolution = kDefaultBendingResolution;
212 fNonBendingResolution = kDefaultNonBendingResolution;
213 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
214 fSimpleBValue = kDefaultSimpleBValue;
215 fSimpleBLength = kDefaultSimpleBLength;
216 fSimpleBPosition = kDefaultSimpleBPosition;
217 fRecGeantHits = kDefaultRecGeantHits;
218 fEfficiency = kDefaultEfficiency;
219 fPrintLevel = kDefaultPrintLevel;
a9e2aefa 220 return;
221}
222
223//__________________________________________________________________________
3831f268 224Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
a9e2aefa 225{
226 // Returns impact parameter at vertex in bending plane (cm),
227 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
228 // using simple values for dipole magnetic field.
065bd0e1 229 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 230 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
231 BendingMomentum);
232}
233
234//__________________________________________________________________________
3831f268 235Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
a9e2aefa 236{
237 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 238 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 239 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
240 // using simple values for dipole magnetic field.
a9e2aefa 241 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
242 ImpactParam);
243}
244
245//__________________________________________________________________________
246void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
247{
248 // Set background file ... for GEANT hits
249 // Must be called after having loaded the firts signal event
250 if (fPrintLevel >= 0) {
251 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
252 << BkgGeantFileName << "''" << endl;}
253 if (strlen(BkgGeantFileName)) {
254 // BkgGeantFileName not empty: try to open the file
255 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
256 fBkgGeantFile = new TFile(BkgGeantFileName);
257 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
258 if (fBkgGeantFile-> IsOpen()) {
259 if (fPrintLevel >= 0) {
260 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
261 << "'' successfully opened" << endl;}
262 }
263 else {
264 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
265 cout << "NOT FOUND: EXIT" << endl;
266 exit(0); // right instruction for exit ????
267 }
268 // Arrays for "particles" and "hits"
269 fBkgGeantParticles = new TClonesArray("TParticle", 200);
270 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
271 // Event number to -1 for initialization
272 fBkgGeantEventNumber = -1;
273 // Back to the signal file:
274 // first signal event must have been loaded previously,
275 // otherwise, Segmentation violation at the next instruction
276 // How is it possible to do smething better ????
277 ((gAlice->TreeK())->GetCurrentFile())->cd();
278 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
279 }
280 return;
281}
282
283//__________________________________________________________________________
284void AliMUONEventReconstructor::NextBkgGeantEvent(void)
285{
286 // Get next event in background file for GEANT hits
287 // Goes back to event number 0 when end of file is reached
288 char treeName[20];
289 TBranch *branch;
290 if (fPrintLevel >= 0) {
291 cout << "Enter NextBkgGeantEvent" << endl;}
292 // Clean previous event
293 if(fBkgGeantTK) delete fBkgGeantTK;
294 fBkgGeantTK = NULL;
295 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
296 if(fBkgGeantTH) delete fBkgGeantTH;
297 fBkgGeantTH = NULL;
298 if(fBkgGeantHits) fBkgGeantHits->Clear();
299 // Increment event number
300 fBkgGeantEventNumber++;
301 // Get access to Particles and Hits for event from background file
302 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
303 fBkgGeantFile->cd();
304 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
305 // Particles: TreeK for event and branch "Particles"
306 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
307 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
308 if (!fBkgGeantTK) {
309 if (fPrintLevel >= 0) {
310 cout << "Cannot find Kine Tree for background event: " <<
311 fBkgGeantEventNumber << endl;
312 cout << "Goes back to event 0" << endl;
313 }
314 fBkgGeantEventNumber = 0;
315 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
316 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
317 if (!fBkgGeantTK) {
318 cout << "ERROR: cannot find Kine Tree for background event: " <<
319 fBkgGeantEventNumber << endl;
320 exit(0);
321 }
322 }
323 if (fBkgGeantTK)
324 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
325 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
326 // Hits: TreeH for event and branch "MUON"
327 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
328 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
329 if (!fBkgGeantTH) {
330 cout << "ERROR: cannot find Hits Tree for background event: " <<
331 fBkgGeantEventNumber << endl;
332 exit(0);
333 }
334 if (fBkgGeantTH && fBkgGeantHits) {
335 branch = fBkgGeantTH->GetBranch("MUON");
336 if (branch) branch->SetAddress(&fBkgGeantHits);
337 }
338 fBkgGeantTH->GetEntries(); // necessary ????
339 // Back to the signal file
340 ((gAlice->TreeK())->GetCurrentFile())->cd();
341 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
342 return;
343}
344
345//__________________________________________________________________________
346void AliMUONEventReconstructor::EventReconstruct(void)
347{
348 // To reconstruct one event
349 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
350 MakeEventToBeReconstructed();
351 MakeSegments();
352 MakeTracks();
353 return;
354}
355
356 //__________________________________________________________________________
357void AliMUONEventReconstructor::ResetHitsForRec(void)
358{
359 // To reset the array and the number of HitsForRec,
360 // and also the number of HitsForRec
361 // and the index of the first HitForRec per chamber
362 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
363 fNHitsForRec = 0;
9cbdf048 364 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 365 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
366 return;
367}
368
369 //__________________________________________________________________________
370void AliMUONEventReconstructor::ResetSegments(void)
371{
372 // To reset the TClonesArray of segments and the number of Segments
373 // for all stations
9cbdf048 374 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 375 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
376 fNSegments[st] = 0;
377 }
378 return;
379}
380
381 //__________________________________________________________________________
382void AliMUONEventReconstructor::ResetTracks(void)
383{
384 // To reset the TClonesArray of reconstructed tracks
8429a5e4 385 if (fRecTracksPtr) fRecTracksPtr->Delete();
386 // Delete in order that the Track destructors are called,
387 // hence the space for the TClonesArray of pointers to TrackHit's is freed
a9e2aefa 388 fNRecTracks = 0;
389 return;
390}
391
8429a5e4 392 //__________________________________________________________________________
393void AliMUONEventReconstructor::ResetTrackHits(void)
394{
395 // To reset the TClonesArray of hits on reconstructed tracks
396 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
397 fNRecTrackHits = 0;
398 return;
399}
400
a9e2aefa 401 //__________________________________________________________________________
402void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
403{
404 // To make the list of hits to be reconstructed,
405 // either from the GEANT hits or from the raw clusters
406 // according to the parameter set for the reconstructor
88cb7938 407 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
408
409 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
410 if (rl == 0x0)
411 {
412 Error("MakeEventToBeReconstructed",
413 "Can not find Run Loader in Event Folder named %s.",
414 evfoldname.Data());
415 return;
416 }
417 AliLoader* gime = rl->GetLoader("MUONLoader");
418 if (gime == 0x0)
419 {
420 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
421 return;
422 }
423
a9e2aefa 424 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
425 ResetHitsForRec();
426 if (fRecGeantHits == 1) {
427 // Reconstruction from GEANT hits
428 // Back to the signal file
88cb7938 429 TTree* treeH = gime->TreeH();
430 if (treeH == 0x0)
431 {
432 Int_t retval = gime->LoadHits();
433 if ( retval)
434 {
435 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
436 return;
437 }
438 treeH = gime->TreeH();
439 if (treeH == 0x0)
440 {
441 Error("MakeEventToBeReconstructed","Can not get TreeH");
442 return;
443 }
444 }
445
446 AddHitsForRecFromGEANT(treeH);
447
a9e2aefa 448 // Background hits
449 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
450 // Sort HitsForRec in increasing order with respect to chamber number
451 SortHitsForRecWithIncreasingChamber();
452 }
453 else {
454 // Reconstruction from raw clusters
455 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
456 // Security on MUON ????
457 // TreeR assumed to be be "prepared" in calling function
458 // by "MUON->GetTreeR(nev)" ????
88cb7938 459 TTree *treeR = gime->TreeR();
9cbdf048 460 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 461 // No sorting: it is done automatically in the previous function
462 }
463 if (fPrintLevel >= 10) {
464 cout << "end of MakeEventToBeReconstructed" << endl;
465 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 466 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 467 cout << "chamber(0...): " << ch
468 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
469 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
470 << endl;
471 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
472 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
473 hit++) {
474 cout << "HitForRec index(0...): " << hit << endl;
475 ((*fHitsForRecPtr)[hit])->Dump();
476 }
477 }
478 }
479 return;
480}
481
482 //__________________________________________________________________________
483void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
484{
485 // To add to the list of hits for reconstruction
486 // the GEANT signal hits from a hit tree TH.
83dbc640 487 Int_t hitBits, chamBits; //AZ
a9e2aefa 488 if (fPrintLevel >= 2)
489 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
490 if (TH == NULL) return;
9cbdf048 491 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 492 // Security on MUON ????
493 // See whether it could be the same for signal and background ????
494 // Loop over tracks in tree
495 Int_t ntracks = (Int_t) TH->GetEntries();
496 if (fPrintLevel >= 2)
497 cout << "ntracks: " << ntracks << endl;
83dbc640 498 fMuons = 0; //AZ
a9e2aefa 499 for (Int_t track = 0; track < ntracks; track++) {
500 gAlice->ResetHits();
501 TH->GetEvent(track);
502 // Loop over hits
503 Int_t hit = 0;
83dbc640 504 hitBits = 0; // AZ
505 chamBits = 0; // AZ
506 Int_t itrack = track; //AZ
9cbdf048 507 for (AliMUONHit* mHit = (AliMUONHit*) pMUON->FirstHit(-1);
a9e2aefa 508 mHit;
9cbdf048 509 mHit = (AliMUONHit*) pMUON->NextHit(), hit++) {
83dbc640 510 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
511 //itrack = mHit->Track(); //AZ
512 //AZNewHitForRecFromGEANT(mHit,track, hit, 1);
513 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
514 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
515 && itrack <= 2) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
a9e2aefa 516 } // end of hit loop
83dbc640 517 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
518 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
519 fMuons += 1; //AZ
520 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
521 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
522 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
a9e2aefa 523 } // end of track loop
524 return;
525}
526
527 //__________________________________________________________________________
528void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
529{
530 // To add to the list of hits for reconstruction
531 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
532 // How to have only one function "AddHitsForRecFromGEANT" ????
533 if (fPrintLevel >= 2)
534 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
535 if (TH == NULL) return;
536 // Loop over tracks in tree
537 Int_t ntracks = (Int_t) TH->GetEntries();
538 if (fPrintLevel >= 2)
539 cout << "ntracks: " << ntracks << endl;
540 for (Int_t track = 0; track < ntracks; track++) {
541 if (Hits) Hits->Clear();
542 TH->GetEvent(track);
543 // Loop over hits
544 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
545 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
546 } // end of hit loop
547 } // end of track loop
548 return;
549}
550
551 //__________________________________________________________________________
552AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
553{
554 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
555 // with hit number "HitNumber" in the track numbered "TrackNumber",
556 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
557 // Selects hits in tracking (not trigger) chambers.
558 // Takes into account the efficiency (fEfficiency)
559 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
560 // Adds a condition on the radius between RMin and RMax
561 // to better simulate the real chambers.
562 // Returns the pointer to the new hit for reconstruction,
563 // or NULL in case of inefficiency or non tracking chamber or bad radius.
564 // No condition on at most 20 cm from a muon from a resonance
565 // like in Fortran TRACKF_STAT.
566 AliMUONHitForRec* hitForRec;
567 Double_t bendCoor, nonBendCoor, radius;
0a5f36d9 568 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
a9e2aefa 569 // only in tracking chambers (fChamber starts at 1)
9cbdf048 570 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 571 // only if hit is efficient (keep track for checking ????)
572 if (gRandom->Rndm() > fEfficiency) return NULL;
573 // only if radius between RMin and RMax
94de3818 574 bendCoor = Hit->Y();
575 nonBendCoor = Hit->X();
a9e2aefa 576 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
d0bfce8d 577 // This cut is not needed with a realistic chamber geometry !!!!
578// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
a9e2aefa 579 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
580 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
581 fNHitsForRec++;
582 // add smearing from resolution
583 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
584 hitForRec->SetNonBendingCoor(nonBendCoor
585 + gRandom->Gaus(0., fNonBendingResolution));
d0bfce8d 586// // !!!! without smearing
587// hitForRec->SetBendingCoor(bendCoor);
588// hitForRec->SetNonBendingCoor(nonBendCoor);
a9e2aefa 589 // more information into HitForRec
590 // resolution: angular effect to be added here ????
591 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
592 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
593 // GEANT track info
594 hitForRec->SetHitNumber(HitNumber);
595 hitForRec->SetTHTrack(TrackNumber);
596 hitForRec->SetGeantSignal(Signal);
597 if (fPrintLevel >= 10) {
598 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
599 Hit->Dump();
600 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
601 hitForRec->Dump();}
602 return hitForRec;
603}
604
605 //__________________________________________________________________________
606void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
607{
608 // Sort HitsForRec's in increasing order with respect to chamber number.
609 // Uses the function "Compare".
610 // Update the information for HitsForRec per chamber too.
611 Int_t ch, nhits, prevch;
612 fHitsForRecPtr->Sort();
9cbdf048 613 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 614 fNHitsForRecPerChamber[ch] = 0;
615 fIndexOfFirstHitForRecPerChamber[ch] = 0;
616 }
617 prevch = 0; // previous chamber
618 nhits = 0; // number of hits in current chamber
619 // Loop over HitsForRec
620 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
621 // chamber number (0...)
622 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
623 // increment number of hits in current chamber
624 (fNHitsForRecPerChamber[ch])++;
625 // update index of first HitForRec in current chamber
626 // if chamber number different from previous one
627 if (ch != prevch) {
628 fIndexOfFirstHitForRecPerChamber[ch] = hit;
629 prevch = ch;
630 }
631 }
632 return;
633}
634
635// //__________________________________________________________________________
636// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
637// {
638// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
639// // To add to the list of hits for reconstruction
640// // the (cathode correlated) raw clusters
641// // No condition added, like in Fortran TRACKF_STAT,
642// // on the radius between RMin and RMax.
643// AliMUONHitForRec *hitForRec;
644// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
645// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
646// // Security on MUON ????
647// // Loop over tracking chambers
9cbdf048 648// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 649// // number of HitsForRec to 0 for the chamber
650// fNHitsForRecPerChamber[ch] = 0;
651// // index of first HitForRec for the chamber
652// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
653// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
654// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
655// MUON->ResetReconstHits();
656// TC->GetEvent();
657// Int_t ncor = (Int_t)reconst_hits->GetEntries();
658// // Loop over (cathode correlated) raw clusters
659// for (Int_t cor = 0; cor < ncor; cor++) {
660// AliMUONReconstHit * mCor =
661// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
662// // new AliMUONHitForRec from (cathode correlated) raw cluster
663// // and increment number of AliMUONHitForRec's (total and in chamber)
664// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
665// fNHitsForRec++;
666// (fNHitsForRecPerChamber[ch])++;
667// // more information into HitForRec
668// hitForRec->SetChamberNumber(ch);
669// hitForRec->SetHitNumber(cor);
670// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
671// // could (should) be more exact from chamber geometry ????
672// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
673// if (fPrintLevel >= 10) {
674// cout << "chamber (0...): " << ch <<
675// " cathcorrel (0...): " << cor << endl;
676// mCor->Dump();
677// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
678// hitForRec->Dump();}
679// } // end of cluster loop
680// } // end of chamber loop
681// return;
682// }
683
684 //__________________________________________________________________________
685void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
686{
687 // To add to the list of hits for reconstruction all the raw clusters
688 // No condition added, like in Fortran TRACKF_STAT,
689 // on the radius between RMin and RMax.
690 AliMUONHitForRec *hitForRec;
691 AliMUONRawCluster *clus;
f69d51b5 692 Int_t iclus, nclus, nTRentries;
a9e2aefa 693 TClonesArray *rawclusters;
694 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
88cb7938 695
696 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
697 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
698 if (rl == 0x0)
699 {
700 Error("MakeEventToBeReconstructed",
701 "Can not find Run Loader in Event Folder named %s.",
702 evfoldname.Data());
703 return;
704 }
705 AliLoader* gime = rl->GetLoader("MUONLoader");
706 if (gime == 0x0)
707 {
708 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
709 return;
710 }
711 // Loading AliRun master
712 rl->LoadgAlice();
713 gAlice = rl->GetAliRun();
714
715 // Loading MUON subsystem
716 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
717
f69d51b5 718 nTRentries = Int_t(TR->GetEntries());
719 if (nTRentries != 1) {
720 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
721 << endl;
722 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
723 exit(0);
724 }
88cb7938 725 gime->TreeR()->GetEvent(0); // only one entry
a9e2aefa 726 // Loop over tracking chambers
9cbdf048 727 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 728 // number of HitsForRec to 0 for the chamber
729 fNHitsForRecPerChamber[ch] = 0;
730 // index of first HitForRec for the chamber
731 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
732 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
ce3f5e87 733 rawclusters = pMUON->GetMUONData()->RawClusters(ch);
f69d51b5 734// pMUON->ResetRawClusters();
735// TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
a9e2aefa 736 nclus = (Int_t) (rawclusters->GetEntries());
737 // Loop over (cathode correlated) raw clusters
738 for (iclus = 0; iclus < nclus; iclus++) {
739 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
740 // new AliMUONHitForRec from raw cluster
741 // and increment number of AliMUONHitForRec's (total and in chamber)
742 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
743 fNHitsForRec++;
744 (fNHitsForRecPerChamber[ch])++;
745 // more information into HitForRec
746 // resolution: info should be already in raw cluster and taken from it ????
747 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
748 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
749 // original raw cluster
750 hitForRec->SetChamberNumber(ch);
751 hitForRec->SetHitNumber(iclus);
ba5b68db 752 // Z coordinate of the raw cluster (cm)
cfe0107f 753 hitForRec->SetZ(clus->fZ[0]);
a9e2aefa 754 if (fPrintLevel >= 10) {
755 cout << "chamber (0...): " << ch <<
756 " raw cluster (0...): " << iclus << endl;
757 clus->Dump();
758 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
759 hitForRec->Dump();}
760 } // end of cluster loop
761 } // end of chamber loop
83dbc640 762 SortHitsForRecWithIncreasingChamber(); //AZ
a9e2aefa 763 return;
764}
765
766 //__________________________________________________________________________
767void AliMUONEventReconstructor::MakeSegments(void)
768{
769 // To make the list of segments in all stations,
770 // from the list of hits to be reconstructed
771 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
772 ResetSegments();
773 // Loop over stations
83dbc640 774 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
775 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
776 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
a9e2aefa 777 MakeSegmentsPerStation(st);
778 if (fPrintLevel >= 10) {
779 cout << "end of MakeSegments" << endl;
9cbdf048 780 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 781 cout << "station(0...): " << st
782 << " Segments: " << fNSegments[st]
783 << endl;
784 for (Int_t seg = 0;
785 seg < fNSegments[st];
786 seg++) {
787 cout << "Segment index(0...): " << seg << endl;
788 ((*fSegmentsPtr[st])[seg])->Dump();
789 }
790 }
791 }
792 return;
793}
794
795 //__________________________________________________________________________
796void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
797{
798 // To make the list of segments in station number "Station" (0...)
799 // from the list of hits to be reconstructed.
800 // Updates "fNSegments"[Station].
801 // Segments in stations 4 and 5 are sorted
802 // according to increasing absolute value of "impact parameter"
803 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
804 AliMUONSegment *segment;
805 Bool_t last2st;
806 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
d0bfce8d 807 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 808 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 809 if (fPrintLevel >= 1)
810 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
811 // first and second chambers (0...) in the station
812 Int_t ch1 = 2 * Station;
813 Int_t ch2 = ch1 + 1;
814 // variable true for stations downstream of the dipole:
815 // Station(0..4) equal to 3 or 4
816 if ((Station == 3) || (Station == 4)) {
817 last2st = kTRUE;
818 // maximum impact parameter (cm) according to fMinBendingMomentum...
819 maxImpactParam =
820 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
d0bfce8d 821 // minimum impact parameter (cm) according to fMaxBendingMomentum...
822 minImpactParam =
823 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
a9e2aefa 824 }
825 else last2st = kFALSE;
826 // extrapolation factor from Z of first chamber to Z of second chamber
827 // dZ to be changed to take into account fine structure of chambers ????
828 Double_t extrapFact =
9cbdf048 829 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 830 // index for current segment
831 Int_t segmentIndex = 0;
832 // Loop over HitsForRec in the first chamber of the station
833 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
834 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
835 hit1++) {
836 // pointer to the HitForRec
837 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
838 // extrapolation,
839 // on the straight line joining the HitForRec to the vertex (0,0,0),
840 // to the Z of the second chamber of the station
841 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
842 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
843 // Loop over HitsForRec in the second chamber of the station
844 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
845 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
846 hit2++) {
847 // pointer to the HitForRec
848 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
849 // absolute values of distances, in bending and non bending planes,
850 // between the HitForRec in the second chamber
851 // and the previous extrapolation
852 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
853 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
854 if (last2st) {
855 // bending slope
856 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
857 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
858 // absolute value of impact parameter
859 impactParam =
31817925 860 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
a9e2aefa 861 }
862 // check for distances not too large,
863 // and impact parameter not too big if stations downstream of the dipole.
864 // Conditions "distBend" and "impactParam" correlated for these stations ????
865 if ((distBend < fSegmentMaxDistBending[Station]) &&
866 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
d0bfce8d 867 (!last2st || (impactParam < maxImpactParam)) &&
868 (!last2st || (impactParam > minImpactParam))) {
a9e2aefa 869 // make new segment
870 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
871 AliMUONSegment(hit1Ptr, hit2Ptr);
872 // update "link" to this segment from the hit in the first chamber
873 if (hit1Ptr->GetNSegments() == 0)
874 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
875 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
876 if (fPrintLevel >= 10) {
877 cout << "segmentIndex(0...): " << segmentIndex
878 << " distBend: " << distBend
879 << " distNonBend: " << distNonBend
880 << endl;
881 segment->Dump();
882 cout << "HitForRec in first chamber" << endl;
883 hit1Ptr->Dump();
884 cout << "HitForRec in second chamber" << endl;
885 hit2Ptr->Dump();
886 };
887 // increment index for current segment
888 segmentIndex++;
889 }
890 } //for (Int_t hit2
891 } // for (Int_t hit1...
892 fNSegments[Station] = segmentIndex;
893 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
894 // i.e. Station(0..4) 3 or 4, using the function "Compare".
895 // After this sorting, it is impossible to use
896 // the "fNSegments" and "fIndexOfFirstSegment"
897 // of the HitForRec in the first chamber to explore all segments formed with it.
898 // Is this sorting really needed ????
899 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
900 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
901 << fNSegments[Station] << endl;
902 return;
903}
904
905 //__________________________________________________________________________
906void AliMUONEventReconstructor::MakeTracks(void)
907{
908 // To make the tracks,
909 // from the list of segments and points in all stations
910 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 911 // The order may be important for the following Reset's
a9e2aefa 912 ResetTracks();
8429a5e4 913 ResetTrackHits();
83dbc640 914 if (fTrackMethod == 2) { //AZ - Kalman filter
915 MakeTrackCandidatesK();
916 // Follow tracks in stations(1..) 3, 2 and 1
917 FollowTracksK();
918 // Remove double tracks
919 RemoveDoubleTracksK();
920 // Propagate tracks to the vertex thru absorber
921 GoToVertex();
922 } else { //AZ
923 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
924 MakeTrackCandidates();
925 // Follow tracks in stations(1..) 3, 2 and 1
926 FollowTracks();
927 // Remove double tracks
928 RemoveDoubleTracks();
929 }
a9e2aefa 930 return;
931}
932
933 //__________________________________________________________________________
934Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
935{
936 // To make track candidates with two segments in stations(1..) 4 and 5,
937 // the first segment being pointed to by "BegSegment".
938 // Returns the number of such track candidates.
939 Int_t endStation, iEndSegment, nbCan2Seg;
940 AliMUONSegment *endSegment, *extrapSegment;
941 AliMUONTrack *recTrack;
942 Double_t mcsFactor;
943 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
944 // Station for the end segment
945 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
946 // multiple scattering factor corresponding to one chamber
947 mcsFactor = 0.0136 /
948 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
949 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
950 // linear extrapolation to end station
951 extrapSegment =
952 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
953 // number of candidates with 2 segments to 0
954 nbCan2Seg = 0;
955 // Loop over segments in the end station
956 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
957 // pointer to segment
958 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
959 // test compatibility between current segment and "extrapSegment"
04b5ea16 960 // 4 because 4 quantities in chi2
a9e2aefa 961 if ((endSegment->
962 NormalizedChi2WithSegment(extrapSegment,
963 fMaxSigma2Distance)) <= 4.0) {
964 // both segments compatible:
965 // make track candidate from "begSegment" and "endSegment"
966 if (fPrintLevel >= 2)
967 cout << "TrackCandidate with Segment " << iEndSegment <<
968 " in Station(0..) " << endStation << endl;
969 // flag for both segments in one track:
970 // to be done in track constructor ????
971 BegSegment->SetInTrack(kTRUE);
972 endSegment->SetInTrack(kTRUE);
973 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
974 AliMUONTrack(BegSegment, endSegment, this);
975 fNRecTracks++;
976 if (fPrintLevel >= 10) recTrack->RecursiveDump();
977 // increment number of track candidates with 2 segments
978 nbCan2Seg++;
979 }
980 } // for (iEndSegment = 0;...
981 delete extrapSegment; // should not delete HitForRec's it points to !!!!
982 return nbCan2Seg;
983}
984
985 //__________________________________________________________________________
986Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
987{
988 // To make track candidates with one segment and one point
989 // in stations(1..) 4 and 5,
990 // the segment being pointed to by "BegSegment".
991 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
992 AliMUONHitForRec *extrapHitForRec, *hit;
993 AliMUONTrack *recTrack;
994 Double_t mcsFactor;
995 if (fPrintLevel >= 1)
996 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
997 // station for the end point
998 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
999 // multiple scattering factor corresponding to one chamber
1000 mcsFactor = 0.0136 /
1001 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1002 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1003 // first and second chambers(0..) in the end station
1004 ch1 = 2 * endStation;
1005 ch2 = ch1 + 1;
1006 // number of candidates to 0
1007 nbCan1Seg1Hit = 0;
1008 // Loop over chambers of the end station
1009 for (ch = ch2; ch >= ch1; ch--) {
1010 // linear extrapolation to chamber
1011 extrapHitForRec =
1012 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1013 // limits for the hit index in the loop
1014 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1015 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1016 // Loop over HitForRec's in the chamber
1017 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1018 // pointer to HitForRec
1019 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1020 // test compatibility between current HitForRec and "extrapHitForRec"
04b5ea16 1021 // 2 because 2 quantities in chi2
a9e2aefa 1022 if ((hit->
1023 NormalizedChi2WithHitForRec(extrapHitForRec,
1024 fMaxSigma2Distance)) <= 2.0) {
1025 // both HitForRec's compatible:
1026 // make track candidate from begSegment and current HitForRec
1027 if (fPrintLevel >= 2)
1028 cout << "TrackCandidate with HitForRec " << iHit <<
1029 " in Chamber(0..) " << ch << endl;
1030 // flag for beginning segments in one track:
1031 // to be done in track constructor ????
1032 BegSegment->SetInTrack(kTRUE);
1033 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1034 AliMUONTrack(BegSegment, hit, this);
1035 // the right place to eliminate "double counting" ???? how ????
1036 fNRecTracks++;
1037 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1038 // increment number of track candidates
1039 nbCan1Seg1Hit++;
1040 }
1041 } // for (iHit = iHitMin;...
1042 delete extrapHitForRec;
1043 } // for (ch = ch2;...
1044 return nbCan1Seg1Hit;
1045}
1046
1047 //__________________________________________________________________________
1048void AliMUONEventReconstructor::MakeTrackCandidates(void)
1049{
1050 // To make track candidates
1051 // with at least 3 aligned points in stations(1..) 4 and 5
1052 // (two Segment's or one Segment and one HitForRec)
1053 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1054 AliMUONSegment *begSegment;
1055 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1056 // Loop over stations(1..) 5 and 4 for the beginning segment
1057 for (begStation = 4; begStation > 2; begStation--) {
1058 // Loop over segments in the beginning station
1059 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1060 // pointer to segment
1061 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1062 if (fPrintLevel >= 2)
1063 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1064 " in Station(0..) " << begStation << endl;
1065 // Look for track candidates with two segments,
1066 // "begSegment" and all compatible segments in other station.
1067 // Only for beginning station(1..) 5
1068 // because candidates with 2 segments have to looked for only once.
1069 if (begStation == 4)
1070 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
956019b6 1071 // Look for track candidates with one segment and one point,
a9e2aefa 1072 // "begSegment" and all compatible HitForRec's in other station.
1073 // Only if "begSegment" does not belong already to a track candidate.
1074 // Is that a too strong condition ????
1075 if (!(begSegment->GetInTrack()))
1076 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1077 } // for (iBegSegment = 0;...
1078 } // for (begStation = 4;...
1079 return;
1080}
1081
1082 //__________________________________________________________________________
1083void AliMUONEventReconstructor::FollowTracks(void)
1084{
1085 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1086 // too long: should be made more modular !!!!
d0bfce8d 1087 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1088 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
04b5ea16 1089 AliMUONTrack *track, *nextTrack;
1090 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1091 // -1 to avoid compilation warnings
1092 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1093 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
d0bfce8d 1094 Double_t bendingMomentum, chi2Norm = 0.;
9cbdf048 1095 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1096 // local maxSigma2Distance, for easy increase in testing
1097 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1098 if (fPrintLevel >= 2)
1099 cout << "enter FollowTracks" << endl;
1100 // Loop over track candidates
04b5ea16 1101 track = (AliMUONTrack*) fRecTracksPtr->First();
1102 trackIndex = -1;
1103 while (track) {
1104 // Follow function for each track candidate ????
1105 trackIndex++;
1106 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1107 if (fPrintLevel >= 2)
1108 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 1109 // Fit track candidate
1110 track->SetFitMCS(0); // without multiple Coulomb scattering
1111 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1112 track->SetFitStart(0); // from parameters at vertex
1113 track->Fit();
a9e2aefa 1114 if (fPrintLevel >= 10) {
1115 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1116 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1117 track->RecursiveDump();
1118 }
1119 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1120 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1121 // otherwise: majority coincidence 2 !!!!
a9e2aefa 1122 for (station = 2; station >= 0; station--) {
1123 // Track parameters at first track hit (smallest Z)
1124 trackParam1 = ((AliMUONTrackHit*)
1125 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1126 // extrapolation to station
1127 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 1128 extrapSegment = new AliMUONSegment(); // empty segment
d0bfce8d 1129 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
a9e2aefa 1130 // multiple scattering factor corresponding to one chamber
1131 // and momentum in bending plane (not total)
1132 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1133 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1134 // Z difference from previous station
9cbdf048 1135 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1136 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1137 // Z difference between the two previous stations
9cbdf048 1138 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1139 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 1140 // Z difference between the two chambers in the previous station
1141 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1142 (&(pMUON->Chamber(2 * station + 1)))->Z();
1143 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1144 extrapSegment->
1145 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1146 extrapSegment->UpdateFromStationTrackParam
1147 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1148 trackParam1->GetInverseBendingMomentum());
d0bfce8d 1149 // same thing for corrected segment
1150 // better to use copy constructor, after checking that it works properly !!!!
1151 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1152 extrapCorrSegment->
1153 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1154 extrapCorrSegment->UpdateFromStationTrackParam
1155 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1156 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1157 bestChi2 = 5.0;
1158 bestSegment = NULL;
1159 if (fPrintLevel >= 10) {
1160 cout << "FollowTracks: track candidate(0..): " << trackIndex
1161 << " Look for segment in station(0..): " << station << endl;
1162 }
1163 // Loop over segments in station
1164 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1165 // Look for best compatible Segment in station
1166 // should consider all possibilities ????
1167 // multiple scattering ????
1168 // separation in 2 functions: Segment and HitForRec ????
1169 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
d0bfce8d 1170 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1171 // according to real Z value of "segment" and slopes of "extrapSegment"
1172 extrapCorrSegment->
1173 SetBendingCoor(extrapSegment->GetBendingCoor() +
1174 extrapSegment->GetBendingSlope() *
1175 (segment->GetHitForRec1()->GetZ() -
1176 (&(pMUON->Chamber(2 * station)))->Z()));
1177 extrapCorrSegment->
1178 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1179 extrapSegment->GetNonBendingSlope() *
1180 (segment->GetHitForRec1()->GetZ() -
1181 (&(pMUON->Chamber(2 * station)))->Z()));
1182 chi2 = segment->
1183 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
a9e2aefa 1184 if (chi2 < bestChi2) {
1185 // update best Chi2 and Segment if better found
1186 bestSegment = segment;
1187 bestChi2 = chi2;
1188 }
1189 }
1190 if (bestSegment) {
1191 // best segment found: add it to track candidate
1192 track->AddSegment(bestSegment);
1193 // set track parameters at these two TrakHit's
1194 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1195 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1196 if (fPrintLevel >= 10) {
1197 cout << "FollowTracks: track candidate(0..): " << trackIndex
1198 << " Added segment in station(0..): " << station << endl;
1199 track->RecursiveDump();
1200 }
1201 }
1202 else {
1203 // No best segment found:
1204 // Look for best compatible HitForRec in station:
1205 // should consider all possibilities ????
1206 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1207 extrapHit = new AliMUONHitForRec(); // empty hit
d0bfce8d 1208 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
a9e2aefa 1209 bestChi2 = 3.0;
1210 bestHit = NULL;
1211 if (fPrintLevel >= 10) {
1212 cout << "FollowTracks: track candidate(0..): " << trackIndex
1213 << " Segment not found, look for hit in station(0..): " << station
1214 << endl;
1215 }
1216 // Loop over chambers of the station
d82671a0 1217 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1218 // coordinates of extrapolated hit
d82671a0 1219 extrapHit->
1220 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1221 extrapHit->
1222 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1223 // resolutions from "extrapSegment"
1224 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1225 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
d0bfce8d 1226 // same things for corrected hit
1227 // better to use copy constructor, after checking that it works properly !!!!
1228 extrapCorrHit->
1229 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1230 extrapCorrHit->
1231 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1232 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1233 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
a9e2aefa 1234 // Loop over hits in the chamber
956019b6 1235 ch = 2 * station + chInStation;
a9e2aefa 1236 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1237 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1238 fNHitsForRecPerChamber[ch];
1239 iHit++) {
1240 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
d0bfce8d 1241 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1242 // according to real Z value of "hit" and slopes of right "trackParam"
1243 extrapCorrHit->
1244 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1245 (&(trackParam[chInStation]))->GetBendingSlope() *
1246 (hit->GetZ() -
1247 (&(trackParam[chInStation]))->GetZ()));
1248 extrapCorrHit->
1249 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1250 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1251 (hit->GetZ() -
1252 (&(trackParam[chInStation]))->GetZ()));
a9e2aefa 1253 // condition for hit not already in segment ????
1254 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1255 if (chi2 < bestChi2) {
1256 // update best Chi2 and HitForRec if better found
1257 bestHit = hit;
1258 bestChi2 = chi2;
d82671a0 1259 chBestHit = chInStation;
a9e2aefa 1260 }
1261 }
1262 }
1263 if (bestHit) {
1264 // best hit found: add it to track candidate
1265 track->AddHitForRec(bestHit);
956019b6 1266 // set track parameters at this TrackHit
a9e2aefa 1267 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1268 &(trackParam[chBestHit]));
1269 if (fPrintLevel >= 10) {
1270 cout << "FollowTracks: track candidate(0..): " << trackIndex
1271 << " Added hit in station(0..): " << station << endl;
1272 track->RecursiveDump();
1273 }
1274 }
1275 else {
8429a5e4 1276 // Remove current track candidate
1277 // and corresponding TrackHit's, ...
1278 track->Remove();
04b5ea16 1279 delete extrapSegment;
d0bfce8d 1280 delete extrapCorrSegment;
1281 delete extrapHit;
1282 delete extrapCorrHit;
a9e2aefa 1283 break; // stop the search for this candidate:
1284 // exit from the loop over station
1285 }
d0bfce8d 1286 delete extrapHit;
1287 delete extrapCorrHit;
a9e2aefa 1288 }
04b5ea16 1289 delete extrapSegment;
d0bfce8d 1290 delete extrapCorrSegment;
a9e2aefa 1291 // Sort track hits according to increasing Z
1292 track->GetTrackHitsPtr()->Sort();
1293 // Update track parameters at first track hit (smallest Z)
1294 trackParam1 = ((AliMUONTrackHit*)
1295 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
d0bfce8d 1296 bendingMomentum = 0.;
1297 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1298 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1299 // Track removed if bendingMomentum not in window [min, max]
1300 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1301 track->Remove();
1302 break; // stop the search for this candidate:
1303 // exit from the loop over station
1304 }
956019b6 1305 // Track fit
04b5ea16 1306 // with multiple Coulomb scattering if all stations
1307 if (station == 0) track->SetFitMCS(1);
956019b6 1308 // without multiple Coulomb scattering if not all stations
04b5ea16 1309 else track->SetFitMCS(0);
956019b6 1310 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1311 track->SetFitStart(1); // from parameters at first hit
1312 track->Fit();
d0bfce8d 1313 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1314 if (numberOfDegFree > 0) {
1315 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1316 } else {
1317 chi2Norm = 1.e10;
1318 }
1319 // Track removed if normalized chi2 too high
1320 if (chi2Norm > fMaxChi2) {
1321 track->Remove();
1322 break; // stop the search for this candidate:
1323 // exit from the loop over station
1324 }
a9e2aefa 1325 if (fPrintLevel >= 10) {
1326 cout << "FollowTracks: track candidate(0..): " << trackIndex
1327 << " after fit from station(0..): " << station << " to 4" << endl;
1328 track->RecursiveDump();
1329 }
04b5ea16 1330 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1331 // after going through the first station
04b5ea16 1332 if (station == 0) {
1333 trackParamVertex = *trackParam1;
1334 (&trackParamVertex)->ExtrapToVertex();
1335 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1336 if (fPrintLevel >= 1) {
1337 cout << "FollowTracks: track candidate(0..): " << trackIndex
1338 << " after extrapolation to vertex" << endl;
1339 track->RecursiveDump();
1340 }
04b5ea16 1341 }
a9e2aefa 1342 } // for (station = 2;...
04b5ea16 1343 // go really to next track
1344 track = nextTrack;
1345 } // while (track)
1346 // Compression of track array (necessary after Remove ????)
1347 fRecTracksPtr->Compress();
1348 return;
1349}
1350
1351 //__________________________________________________________________________
8429a5e4 1352void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1353{
1354 // To remove double tracks.
1355 // Tracks are considered identical
1356 // if they have at least half of their hits in common.
1357 // Among two identical tracks, one keeps the track with the larger number of hits
1358 // or, if these numbers are equal, the track with the minimum Chi2.
1359 AliMUONTrack *track1, *track2, *trackToRemove;
1360 Bool_t identicalTracks;
1361 Int_t hitsInCommon, nHits1, nHits2;
1362 identicalTracks = kTRUE;
1363 while (identicalTracks) {
1364 identicalTracks = kFALSE;
1365 // Loop over first track of the pair
1366 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1367 while (track1 && (!identicalTracks)) {
1368 nHits1 = track1->GetNTrackHits();
1369 // Loop over second track of the pair
1370 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1371 while (track2 && (!identicalTracks)) {
1372 nHits2 = track2->GetNTrackHits();
1373 // number of hits in common between two tracks
1374 hitsInCommon = track1->HitsInCommon(track2);
1375 // check for identical tracks
1376 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1377 identicalTracks = kTRUE;
1378 // decide which track to remove
1379 if (nHits1 > nHits2) trackToRemove = track2;
1380 else if (nHits1 < nHits2) trackToRemove = track1;
1381 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1382 trackToRemove = track2;
1383 else trackToRemove = track1;
1384 // remove it
1385 trackToRemove->Remove();
1386 }
1387 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1388 } // track2
1389 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1390 } // track1
1391 }
1392 return;
1393}
1394
1395 //__________________________________________________________________________
04b5ea16 1396void AliMUONEventReconstructor::EventDump(void)
1397{
1398 // Dump reconstructed event (track parameters at vertex and at first hit),
1399 // and the particle parameters
1400
1401 AliMUONTrack *track;
1402 AliMUONTrackParam *trackParam, *trackParam1;
04b5ea16 1403 Double_t bendingSlope, nonBendingSlope, pYZ;
1404 Double_t pX, pY, pZ, x, y, z, c;
1405 Int_t np, trackIndex, nTrackHits;
1406
1407 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1408 if (fPrintLevel >= 1) {
1409 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1410 }
1411 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1412 // Loop over reconstructed tracks
1413 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
83dbc640 1414 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
04b5ea16 1415 if (fPrintLevel >= 1)
1416 cout << " track number: " << trackIndex << endl;
1417 // function for each track for modularity ????
1418 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1419 nTrackHits = track->GetNTrackHits();
1420 if (fPrintLevel >= 1)
1421 cout << " number of track hits: " << nTrackHits << endl;
1422 // track parameters at Vertex
1423 trackParam = track->GetTrackParamAtVertex();
1424 x = trackParam->GetNonBendingCoor();
1425 y = trackParam->GetBendingCoor();
1426 z = trackParam->GetZ();
1427 bendingSlope = trackParam->GetBendingSlope();
1428 nonBendingSlope = trackParam->GetNonBendingSlope();
1429 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1430 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1431 pX = pZ * nonBendingSlope;
1432 pY = pZ * bendingSlope;
1433 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1434 if (fPrintLevel >= 1)
1435 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1436 z, x, y, pX, pY, pZ, c);
1437
1438 // track parameters at first hit
1439 trackParam1 = ((AliMUONTrackHit*)
1440 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1441 x = trackParam1->GetNonBendingCoor();
1442 y = trackParam1->GetBendingCoor();
1443 z = trackParam1->GetZ();
1444 bendingSlope = trackParam1->GetBendingSlope();
1445 nonBendingSlope = trackParam1->GetNonBendingSlope();
1446 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1447 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1448 pX = pZ * nonBendingSlope;
1449 pY = pZ * bendingSlope;
1450 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1451 if (fPrintLevel >= 1)
1452 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1453 z, x, y, pX, pY, pZ, c);
1454 }
1455 // informations about generated particles
2ab0c725 1456 np = gAlice->GetNtrack();
04b5ea16 1457 printf(" **** number of generated particles: %d \n", np);
1458
88cb7938 1459// for (Int_t iPart = 0; iPart < np; iPart++) {
1460// p = gAlice->Particle(iPart);
1461// printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1462// iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1463// }
a9e2aefa 1464 return;
1465}
1466
c7ba256d 1467void AliMUONEventReconstructor::FillEvent()
1468{
1469// Create a new AliMUONRecoEvent, fill its track list, then add it as a
1470// leaf in the Event branch of TreeRecoEvent tree
1471 cout << "Enter FillEvent() ...\n";
1472
1473 if (!fRecoEvent) {
1474 fRecoEvent = new AliMUONRecoEvent();
1475 } else {
1476 fRecoEvent->Clear();
1477 }
1478 //save current directory
1479 TDirectory *current = gDirectory;
1480 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1481 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
83dbc640 1482 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1483 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
c7ba256d 1484 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1485 TBranch *branch = fEventTree->GetBranch("Event");
d0f40f23 1486 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
c7ba256d 1487 branch->SetAutoDelete();
1488 fTreeFile->cd();
1489 fEventTree->Fill();
1490 fTreeFile->Write();
1491 }
1492 // restore directory
1493 current->cd();
1494}
83dbc640 1495
1496//__________________________________________________________________________
1497void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1498{
1499 // To make initial tracks for Kalman filter from the list of segments
1500 Int_t istat, iseg;
1501 AliMUONSegment *segment;
1502 AliMUONTrackK *trackK;
1503
1504 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1505 // Reset the TClonesArray of reconstructed tracks
1506 if (fRecTracksPtr) fRecTracksPtr->Delete();
1507 // Delete in order that the Track destructors are called,
1508 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1509 fNRecTracks = 0;
1510
1511 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1512 // Loop over stations(1...) 5 and 4
1513 for (istat=4; istat>=3; istat--) {
1514 // Loop over segments in the station
1515 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1516 // Transform segments to tracks and evaluate covariance matrix
1517 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1518 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1519 fNRecTracks++;
1520 } // for (iseg=0;...)
1521 } // for (istat=4;...)
1522 return;
1523}
1524
1525//__________________________________________________________________________
1526void AliMUONEventReconstructor::FollowTracksK(void)
1527{
1528 // Follow tracks using Kalman filter
1529 Bool_t Ok;
1530 Int_t icand, ichamBeg, ichamEnd, chamBits;
1531 Double_t zDipole1, zDipole2;
1532 AliMUONTrackK *trackK;
1533 AliMUONHitForRec *hit;
1534 AliMUONRawCluster *clus;
1535 TClonesArray *rawclusters;
1536 AliMUON *pMUON;
1537 clus = 0; rawclusters = 0;
1538
1539 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1540 zDipole2 = zDipole1 + GetSimpleBLength();
1541
1542 // Print hits
1543 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1544 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1545 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1546 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1547 /*
1548 cout << " Hit #" << hit->GetChamberNumber() << " ";
1549 cout << hit->GetBendingCoor() << " ";
1550 cout << hit->GetNonBendingCoor() << " ";
1551 cout << hit->GetZ() << " ";
1552 cout << hit->GetGeantSignal() << " ";
1553 cout << hit->GetTHTrack() << endl;
1554 */
1555 /*
1556 printf(" Hit # %d %10.4f %10.4f %10.4f",
1557 hit->GetChamberNumber(), hit->GetBendingCoor(),
1558 hit->GetNonBendingCoor(), hit->GetZ());
1559 if (fRecGeantHits) {
1560 // from GEANT hits
1561 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1562 } else {
1563 // from raw clusters
1564 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1565 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1566 GetHitNumber());
1567 printf("%3d", clus->fTracks[1]-1);
1568 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1569 else printf("\n");
1570 }
1571 */
1572 }
1573
1574 icand = -1;
1575 Int_t nSeeds = fNRecTracks; // starting number of seeds
1576 // Loop over track candidates
1577 while (icand < fNRecTracks-1) {
1578 icand ++;
1579 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1580
1581 // Discard candidate which will produce the double track
1582 if (icand > 0) {
1583 Ok = CheckCandidateK(icand,nSeeds);
1584 if (!Ok) {
1585 //trackK->SetRecover(-1); // mark candidate to be removed
1586 //continue;
1587 }
1588 }
1589
1590 Ok = kTRUE;
1591 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1592 trackK->GetHitOnTrack()->Last(); // last hit
1593 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1594 ichamBeg = hit->GetChamberNumber();
1595 ichamEnd = 0;
1596 // Check propagation direction
1597 if (trackK->GetTrackDir() > 0) {
1598 ichamEnd = 9; // forward propagation
1599 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1600 if (Ok) {
1601 ichamBeg = ichamEnd;
1602 ichamEnd = 6; // backward propagation
1603 // Change weight matrix and zero fChi2 for backpropagation
1604 trackK->StartBack();
1605 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1606 ichamBeg = ichamEnd;
1607 ichamEnd = 0;
1608 }
1609 } else {
1610 if (trackK->GetBPFlag()) {
1611 // backpropagation
1612 ichamEnd = 6; // backward propagation
1613 // Change weight matrix and zero fChi2 for backpropagation
1614 trackK->StartBack();
1615 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1616 ichamBeg = ichamEnd;
1617 ichamEnd = 0;
1618 }
1619 }
1620
1621 if (Ok) {
1622 trackK->SetTrackDir(-1);
1623 trackK->SetBPFlag(kFALSE);
1624 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1625 }
1626 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1627 else trackK->SetRecover(-1); // mark candidate to be removed
1628
1629 // Majority 3 of 4 in first 2 stations
1630 chamBits = 0;
1631 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1632 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1633 chamBits |= BIT(hit->GetChamberNumber()-1);
1634 }
1635 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1636 //mark candidate to be removed
1637 } // while
1638
1639 for (Int_t i=0; i<fNRecTracks; i++) {
1640 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1641 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1642 }
1643
1644 // Compress TClonesArray
1645 fRecTracksPtr->Compress();
1646 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1647 return;
1648}
1649
1650//__________________________________________________________________________
1651Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1652{
1653 // Discards track candidate if it will produce the double track (having
1654 // the same seed segment hits as hits of a good track found before)
1655 AliMUONTrackK *track1, *track2;
1656 AliMUONHitForRec *hit1, *hit2, *hit;
1657
1658 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1659 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1660 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1661
1662 for (Int_t i=0; i<icand; i++) {
1663 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1664 //if (track2->GetRecover() < 0) continue;
1665 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1666
1667 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1668 return kFALSE;
1669 } else {
1670 Int_t nSame = 0;
1671 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1672 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1673 if (hit == hit1 || hit == hit2) {
1674 nSame++;
1675 if (nSame == 2) return kFALSE;
1676 }
1677 } // for (Int_t j=0;
1678 }
1679 } // for (Int_t i=0;
1680 return kTRUE;
1681}
1682
1683//__________________________________________________________________________
1684void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1685{
1686 // Removes double tracks (sharing more than half of their hits). Keeps
1687 // the track with higher quality
1688 AliMUONTrackK *track1, *track2, *trackToKill;
1689
1690 // Sort tracks according to their quality
1691 fRecTracksPtr->Sort();
1692
1693 // Loop over first track of the pair
1694 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1695 while (track1) {
1696 // Loop over second track of the pair
1697 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1698 while (track2) {
1699 // Check whether or not to keep track2
1700 if (!track2->KeepTrack(track1)) {
1701 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1702 " " << track2->GetTrackQuality() << endl;
1703 trackToKill = track2;
1704 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1705 trackToKill->Kill();
1706 fRecTracksPtr->Compress();
1707 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1708 } // track2
1709 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1710 } // track1
1711
1712 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1713 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1714}
1715
1716//__________________________________________________________________________
1717void AliMUONEventReconstructor::GoToVertex(void)
1718{
1719 // Propagates track to the vertex thru absorber
1720 // (using Branson correction for now)
1721
1722 Double_t zVertex;
1723 zVertex = 0;
1724 for (Int_t i=0; i<fNRecTracks; i++) {
1725 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1726 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1727 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1728 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber
1729 }
1730}