MC-dependent part of AliRun extracted in AliMC (F.Carminati)
[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
5d12ce38 56#include "AliMC.h"
a9e2aefa 57
a9e2aefa 58//************* Defaults parameters for reconstruction
9cbdf048 59static const Double_t kDefaultMinBendingMomentum = 3.0;
d0bfce8d 60static const Double_t kDefaultMaxBendingMomentum = 500.0;
61static const Double_t kDefaultMaxChi2 = 100.0;
9cbdf048 62static const Double_t kDefaultMaxSigma2Distance = 16.0;
63static const Double_t kDefaultBendingResolution = 0.01;
64static const Double_t kDefaultNonBendingResolution = 0.144;
65static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 66// Simple magnetic field:
67// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
68// Length and Position from reco_muon.F, with opposite sign:
69// Length = ZMAGEND-ZCOIL
70// Position = (ZMAGEND+ZCOIL)/2
71// to be ajusted differently from real magnetic field ????
9cbdf048 72static const Double_t kDefaultSimpleBValue = 7.0;
73static const Double_t kDefaultSimpleBLength = 428.0;
74static const Double_t kDefaultSimpleBPosition = 1019.0;
75static const Int_t kDefaultRecGeantHits = 0;
76static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 77
9cbdf048 78static const Int_t kDefaultPrintLevel = 0;
a9e2aefa 79
80ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
81
82 //__________________________________________________________________________
83AliMUONEventReconstructor::AliMUONEventReconstructor(void)
84{
85 // Constructor for class AliMUONEventReconstructor
86 SetReconstructionParametersToDefaults();
83dbc640 87 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
a9e2aefa 88 // Memory allocation for the TClonesArray of hits for reconstruction
89 // Is 10000 the right size ????
90 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
91 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
92 // Memory allocation for the TClonesArray's of segments in stations
93 // Is 2000 the right size ????
9cbdf048 94 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 95 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
96 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
97 }
98 // Memory allocation for the TClonesArray of reconstructed tracks
99 // Is 10 the right size ????
100 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
101 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
8429a5e4 102 // Memory allocation for the TClonesArray of hits on reconstructed tracks
103 // Is 100 the right size ????
104 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
105 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
a9e2aefa 106
065bd0e1 107 // Sign of fSimpleBValue according to sign of Bx value at (50,50,950).
a6f03ddb 108 Float_t b[3], x[3];
109 x[0] = 50.; x[1] = 50.; x[2] = 950.;
110 gAlice->Field()->Field(x, b);
065bd0e1 111 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
a6f03ddb 112 // See how to get fSimple(BValue, BLength, BPosition)
113 // automatically calculated from the actual magnetic field ????
a9e2aefa 114
115 if (fPrintLevel >= 0) {
a6f03ddb 116 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
117 cout << endl << "Magnetic field from root file:" << endl;
118 gAlice->Field()->Dump();
119 cout << endl;
120 }
c7ba256d 121
47a6b602 122 // Initializions for GEANT background events
123 fBkgGeantFile = 0;
124 fBkgGeantTK = 0;
125 fBkgGeantParticles = 0;
126 fBkgGeantTH = 0;
127 fBkgGeantHits = 0;
128 fBkgGeantEventNumber = -1;
129
c7ba256d 130 // Initialize to 0 pointers to RecoEvent, tree and tree file
131 fRecoEvent = 0;
132 fEventTree = 0;
133 fTreeFile = 0;
134
a9e2aefa 135 return;
136}
137
d9a3473d 138AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
9cbdf048 139{
140 // Dummy copy constructor
141}
142
d9a3473d 143AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
9cbdf048 144{
145 // Dummy assignment operator
146 return *this;
147}
148
a9e2aefa 149 //__________________________________________________________________________
150AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
151{
152 // Destructor for class AliMUONEventReconstructor
c7ba256d 153 if (fTreeFile) {
154 fTreeFile->Close();
155 delete fTreeFile;
156 }
157// if (fEventTree) delete fEventTree;
158 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 159 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 160 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 161 delete fSegmentsPtr[st]; // Correct destruction of everything ????
162 return;
163}
164
165 //__________________________________________________________________________
166void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
167{
168 // Set reconstruction parameters to default values
169 // Would be much more convenient with a structure (or class) ????
9cbdf048 170 fMinBendingMomentum = kDefaultMinBendingMomentum;
d0bfce8d 171 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
172 fMaxChi2 = kDefaultMaxChi2;
9cbdf048 173 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 174
9cbdf048 175 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 176 // ******** Parameters for making HitsForRec
177 // minimum radius,
178 // like in TRACKF_STAT:
179 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
180 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
9cbdf048 181 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
182 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 183 2.0 * TMath::Pi() / 180.0;
184 else fRMin[ch] = 30.0;
d0bfce8d 185 // maximum radius at 10 degrees and Z of chamber
186 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
187 10.0 * TMath::Pi() / 180.0;
a9e2aefa 188 }
a9e2aefa 189
190 // ******** Parameters for making segments
191 // should be parametrized ????
192 // according to interval between chambers in a station ????
193 // Maximum distance in non bending plane
194 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
195 // SIGCUT*DYMAX(IZ)
9cbdf048 196 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 197 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 198 // Maximum distance in bending plane:
199 // values from TRACKF_STAT, corresponding to (J psi 20cm),
200 // scaled to the real distance between chambers in a station
ef21c79e 201 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
202 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
203 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
204 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
205 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
206 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
207 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
208 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
209 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
210 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
a9e2aefa 211
9cbdf048 212 fBendingResolution = kDefaultBendingResolution;
213 fNonBendingResolution = kDefaultNonBendingResolution;
214 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
215 fSimpleBValue = kDefaultSimpleBValue;
216 fSimpleBLength = kDefaultSimpleBLength;
217 fSimpleBPosition = kDefaultSimpleBPosition;
218 fRecGeantHits = kDefaultRecGeantHits;
219 fEfficiency = kDefaultEfficiency;
220 fPrintLevel = kDefaultPrintLevel;
a9e2aefa 221 return;
222}
223
224//__________________________________________________________________________
3831f268 225Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
a9e2aefa 226{
227 // Returns impact parameter at vertex in bending plane (cm),
228 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
229 // using simple values for dipole magnetic field.
065bd0e1 230 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 231 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
232 BendingMomentum);
233}
234
235//__________________________________________________________________________
3831f268 236Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
a9e2aefa 237{
238 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 239 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 240 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
241 // using simple values for dipole magnetic field.
a9e2aefa 242 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
243 ImpactParam);
244}
245
246//__________________________________________________________________________
247void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
248{
249 // Set background file ... for GEANT hits
250 // Must be called after having loaded the firts signal event
251 if (fPrintLevel >= 0) {
252 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
253 << BkgGeantFileName << "''" << endl;}
254 if (strlen(BkgGeantFileName)) {
255 // BkgGeantFileName not empty: try to open the file
256 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
257 fBkgGeantFile = new TFile(BkgGeantFileName);
258 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
259 if (fBkgGeantFile-> IsOpen()) {
260 if (fPrintLevel >= 0) {
261 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
262 << "'' successfully opened" << endl;}
263 }
264 else {
265 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
266 cout << "NOT FOUND: EXIT" << endl;
267 exit(0); // right instruction for exit ????
268 }
269 // Arrays for "particles" and "hits"
270 fBkgGeantParticles = new TClonesArray("TParticle", 200);
271 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
272 // Event number to -1 for initialization
273 fBkgGeantEventNumber = -1;
274 // Back to the signal file:
275 // first signal event must have been loaded previously,
276 // otherwise, Segmentation violation at the next instruction
277 // How is it possible to do smething better ????
278 ((gAlice->TreeK())->GetCurrentFile())->cd();
279 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
280 }
281 return;
282}
283
284//__________________________________________________________________________
285void AliMUONEventReconstructor::NextBkgGeantEvent(void)
286{
287 // Get next event in background file for GEANT hits
288 // Goes back to event number 0 when end of file is reached
289 char treeName[20];
290 TBranch *branch;
291 if (fPrintLevel >= 0) {
292 cout << "Enter NextBkgGeantEvent" << endl;}
293 // Clean previous event
294 if(fBkgGeantTK) delete fBkgGeantTK;
295 fBkgGeantTK = NULL;
296 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
297 if(fBkgGeantTH) delete fBkgGeantTH;
298 fBkgGeantTH = NULL;
299 if(fBkgGeantHits) fBkgGeantHits->Clear();
300 // Increment event number
301 fBkgGeantEventNumber++;
302 // Get access to Particles and Hits for event from background file
303 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
304 fBkgGeantFile->cd();
305 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
306 // Particles: TreeK for event and branch "Particles"
307 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
308 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
309 if (!fBkgGeantTK) {
310 if (fPrintLevel >= 0) {
311 cout << "Cannot find Kine Tree for background event: " <<
312 fBkgGeantEventNumber << endl;
313 cout << "Goes back to event 0" << endl;
314 }
315 fBkgGeantEventNumber = 0;
316 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
317 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
318 if (!fBkgGeantTK) {
319 cout << "ERROR: cannot find Kine Tree for background event: " <<
320 fBkgGeantEventNumber << endl;
321 exit(0);
322 }
323 }
324 if (fBkgGeantTK)
325 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
326 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
327 // Hits: TreeH for event and branch "MUON"
328 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
329 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
330 if (!fBkgGeantTH) {
331 cout << "ERROR: cannot find Hits Tree for background event: " <<
332 fBkgGeantEventNumber << endl;
333 exit(0);
334 }
335 if (fBkgGeantTH && fBkgGeantHits) {
336 branch = fBkgGeantTH->GetBranch("MUON");
337 if (branch) branch->SetAddress(&fBkgGeantHits);
338 }
339 fBkgGeantTH->GetEntries(); // necessary ????
340 // Back to the signal file
341 ((gAlice->TreeK())->GetCurrentFile())->cd();
342 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
343 return;
344}
345
346//__________________________________________________________________________
347void AliMUONEventReconstructor::EventReconstruct(void)
348{
349 // To reconstruct one event
350 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
351 MakeEventToBeReconstructed();
352 MakeSegments();
353 MakeTracks();
354 return;
355}
356
357 //__________________________________________________________________________
358void AliMUONEventReconstructor::ResetHitsForRec(void)
359{
360 // To reset the array and the number of HitsForRec,
361 // and also the number of HitsForRec
362 // and the index of the first HitForRec per chamber
363 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
364 fNHitsForRec = 0;
9cbdf048 365 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 366 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
367 return;
368}
369
370 //__________________________________________________________________________
371void AliMUONEventReconstructor::ResetSegments(void)
372{
373 // To reset the TClonesArray of segments and the number of Segments
374 // for all stations
9cbdf048 375 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 376 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
377 fNSegments[st] = 0;
378 }
379 return;
380}
381
382 //__________________________________________________________________________
383void AliMUONEventReconstructor::ResetTracks(void)
384{
385 // To reset the TClonesArray of reconstructed tracks
8429a5e4 386 if (fRecTracksPtr) fRecTracksPtr->Delete();
387 // Delete in order that the Track destructors are called,
388 // hence the space for the TClonesArray of pointers to TrackHit's is freed
a9e2aefa 389 fNRecTracks = 0;
390 return;
391}
392
393 //__________________________________________________________________________
8429a5e4 394void AliMUONEventReconstructor::ResetTrackHits(void)
395{
396 // To reset the TClonesArray of hits on reconstructed tracks
397 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
398 fNRecTrackHits = 0;
399 return;
400}
401
402 //__________________________________________________________________________
a9e2aefa 403void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
404{
405 // To make the list of hits to be reconstructed,
406 // either from the GEANT hits or from the raw clusters
407 // according to the parameter set for the reconstructor
88cb7938 408 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
409
410 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
411 if (rl == 0x0)
412 {
413 Error("MakeEventToBeReconstructed",
414 "Can not find Run Loader in Event Folder named %s.",
415 evfoldname.Data());
416 return;
417 }
418 AliLoader* gime = rl->GetLoader("MUONLoader");
419 if (gime == 0x0)
420 {
421 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
422 return;
423 }
424
a9e2aefa 425 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
426 ResetHitsForRec();
427 if (fRecGeantHits == 1) {
428 // Reconstruction from GEANT hits
429 // Back to the signal file
88cb7938 430 TTree* treeH = gime->TreeH();
431 if (treeH == 0x0)
432 {
433 Int_t retval = gime->LoadHits();
434 if ( retval)
435 {
436 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
437 return;
438 }
439 treeH = gime->TreeH();
440 if (treeH == 0x0)
441 {
442 Error("MakeEventToBeReconstructed","Can not get TreeH");
443 return;
444 }
445 }
446
447 AddHitsForRecFromGEANT(treeH);
448
a9e2aefa 449 // Background hits
450 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
451 // Sort HitsForRec in increasing order with respect to chamber number
452 SortHitsForRecWithIncreasingChamber();
453 }
454 else {
455 // Reconstruction from raw clusters
456 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
457 // Security on MUON ????
458 // TreeR assumed to be be "prepared" in calling function
459 // by "MUON->GetTreeR(nev)" ????
88cb7938 460 TTree *treeR = gime->TreeR();
9cbdf048 461 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 462 // No sorting: it is done automatically in the previous function
463 }
464 if (fPrintLevel >= 10) {
465 cout << "end of MakeEventToBeReconstructed" << endl;
466 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 467 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 468 cout << "chamber(0...): " << ch
469 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
470 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
471 << endl;
472 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
473 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
474 hit++) {
475 cout << "HitForRec index(0...): " << hit << endl;
476 ((*fHitsForRecPtr)[hit])->Dump();
477 }
478 }
479 }
480 return;
481}
482
483 //__________________________________________________________________________
484void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
485{
486 // To add to the list of hits for reconstruction
487 // the GEANT signal hits from a hit tree TH.
83dbc640 488 Int_t hitBits, chamBits; //AZ
a9e2aefa 489 if (fPrintLevel >= 2)
490 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
491 if (TH == NULL) return;
9cbdf048 492 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
38302c61 493 AliMUONData * muondata = pMUON->GetMUONData();
a9e2aefa 494 // Security on MUON ????
495 // See whether it could be the same for signal and background ????
496 // Loop over tracks in tree
497 Int_t ntracks = (Int_t) TH->GetEntries();
498 if (fPrintLevel >= 2)
499 cout << "ntracks: " << ntracks << endl;
83dbc640 500 fMuons = 0; //AZ
a9e2aefa 501 for (Int_t track = 0; track < ntracks; track++) {
38302c61 502 muondata->ResetHits();
a9e2aefa 503 TH->GetEvent(track);
504 // Loop over hits
505 Int_t hit = 0;
83dbc640 506 hitBits = 0; // AZ
507 chamBits = 0; // AZ
508 Int_t itrack = track; //AZ
38302c61 509
510 Int_t ihit, nhits=0;
511 nhits = (Int_t) muondata->Hits()->GetEntriesFast();
512 AliMUONHit* mHit=0x0;
1391e633 513
38302c61 514 for(ihit=0; ihit<nhits; ihit++) {
515 mHit = static_cast<AliMUONHit*>(muondata->Hits()->At(ihit));
516 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
517 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
518 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
1391e633 519 && itrack <= 2 && !BIT(mHit->Chamber()-1) ) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
38302c61 520 }
1391e633 521
83dbc640 522 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
523 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
524 fMuons += 1; //AZ
525 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
526 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
527 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
a9e2aefa 528 } // end of track loop
529 return;
530}
531
532 //__________________________________________________________________________
533void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
534{
535 // To add to the list of hits for reconstruction
536 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
537 // How to have only one function "AddHitsForRecFromGEANT" ????
538 if (fPrintLevel >= 2)
539 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
540 if (TH == NULL) return;
541 // Loop over tracks in tree
542 Int_t ntracks = (Int_t) TH->GetEntries();
543 if (fPrintLevel >= 2)
544 cout << "ntracks: " << ntracks << endl;
545 for (Int_t track = 0; track < ntracks; track++) {
546 if (Hits) Hits->Clear();
547 TH->GetEvent(track);
548 // Loop over hits
549 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
550 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
551 } // end of hit loop
552 } // end of track loop
553 return;
554}
555
556 //__________________________________________________________________________
557AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
558{
559 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
560 // with hit number "HitNumber" in the track numbered "TrackNumber",
561 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
562 // Selects hits in tracking (not trigger) chambers.
563 // Takes into account the efficiency (fEfficiency)
564 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
565 // Adds a condition on the radius between RMin and RMax
566 // to better simulate the real chambers.
567 // Returns the pointer to the new hit for reconstruction,
568 // or NULL in case of inefficiency or non tracking chamber or bad radius.
569 // No condition on at most 20 cm from a muon from a resonance
570 // like in Fortran TRACKF_STAT.
571 AliMUONHitForRec* hitForRec;
572 Double_t bendCoor, nonBendCoor, radius;
0a5f36d9 573 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
a9e2aefa 574 // only in tracking chambers (fChamber starts at 1)
9cbdf048 575 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 576 // only if hit is efficient (keep track for checking ????)
577 if (gRandom->Rndm() > fEfficiency) return NULL;
578 // only if radius between RMin and RMax
94de3818 579 bendCoor = Hit->Y();
580 nonBendCoor = Hit->X();
a9e2aefa 581 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
d0bfce8d 582 // This cut is not needed with a realistic chamber geometry !!!!
583// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
a9e2aefa 584 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
585 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
586 fNHitsForRec++;
587 // add smearing from resolution
588 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
589 hitForRec->SetNonBendingCoor(nonBendCoor
590 + gRandom->Gaus(0., fNonBendingResolution));
d0bfce8d 591// // !!!! without smearing
592// hitForRec->SetBendingCoor(bendCoor);
593// hitForRec->SetNonBendingCoor(nonBendCoor);
a9e2aefa 594 // more information into HitForRec
595 // resolution: angular effect to be added here ????
596 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
597 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
598 // GEANT track info
599 hitForRec->SetHitNumber(HitNumber);
600 hitForRec->SetTHTrack(TrackNumber);
601 hitForRec->SetGeantSignal(Signal);
602 if (fPrintLevel >= 10) {
603 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
604 Hit->Dump();
605 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
606 hitForRec->Dump();}
607 return hitForRec;
608}
609
610 //__________________________________________________________________________
611void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
612{
613 // Sort HitsForRec's in increasing order with respect to chamber number.
614 // Uses the function "Compare".
615 // Update the information for HitsForRec per chamber too.
616 Int_t ch, nhits, prevch;
617 fHitsForRecPtr->Sort();
9cbdf048 618 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 619 fNHitsForRecPerChamber[ch] = 0;
620 fIndexOfFirstHitForRecPerChamber[ch] = 0;
621 }
622 prevch = 0; // previous chamber
623 nhits = 0; // number of hits in current chamber
624 // Loop over HitsForRec
625 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
626 // chamber number (0...)
627 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
628 // increment number of hits in current chamber
629 (fNHitsForRecPerChamber[ch])++;
630 // update index of first HitForRec in current chamber
631 // if chamber number different from previous one
632 if (ch != prevch) {
633 fIndexOfFirstHitForRecPerChamber[ch] = hit;
634 prevch = ch;
635 }
636 }
637 return;
638}
639
640// //__________________________________________________________________________
641// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
642// {
643// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
644// // To add to the list of hits for reconstruction
645// // the (cathode correlated) raw clusters
646// // No condition added, like in Fortran TRACKF_STAT,
647// // on the radius between RMin and RMax.
648// AliMUONHitForRec *hitForRec;
649// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
650// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
651// // Security on MUON ????
652// // Loop over tracking chambers
9cbdf048 653// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 654// // number of HitsForRec to 0 for the chamber
655// fNHitsForRecPerChamber[ch] = 0;
656// // index of first HitForRec for the chamber
657// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
658// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
659// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
660// MUON->ResetReconstHits();
661// TC->GetEvent();
662// Int_t ncor = (Int_t)reconst_hits->GetEntries();
663// // Loop over (cathode correlated) raw clusters
664// for (Int_t cor = 0; cor < ncor; cor++) {
665// AliMUONReconstHit * mCor =
666// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
667// // new AliMUONHitForRec from (cathode correlated) raw cluster
668// // and increment number of AliMUONHitForRec's (total and in chamber)
669// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
670// fNHitsForRec++;
671// (fNHitsForRecPerChamber[ch])++;
672// // more information into HitForRec
673// hitForRec->SetChamberNumber(ch);
674// hitForRec->SetHitNumber(cor);
675// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
676// // could (should) be more exact from chamber geometry ????
677// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
678// if (fPrintLevel >= 10) {
679// cout << "chamber (0...): " << ch <<
680// " cathcorrel (0...): " << cor << endl;
681// mCor->Dump();
682// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
683// hitForRec->Dump();}
684// } // end of cluster loop
685// } // end of chamber loop
686// return;
687// }
688
689 //__________________________________________________________________________
690void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
691{
692 // To add to the list of hits for reconstruction all the raw clusters
693 // No condition added, like in Fortran TRACKF_STAT,
694 // on the radius between RMin and RMax.
695 AliMUONHitForRec *hitForRec;
696 AliMUONRawCluster *clus;
f69d51b5 697 Int_t iclus, nclus, nTRentries;
a9e2aefa 698 TClonesArray *rawclusters;
699 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
88cb7938 700
701 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
702 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
703 if (rl == 0x0)
704 {
705 Error("MakeEventToBeReconstructed",
706 "Can not find Run Loader in Event Folder named %s.",
707 evfoldname.Data());
708 return;
709 }
710 AliLoader* gime = rl->GetLoader("MUONLoader");
711 if (gime == 0x0)
712 {
713 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
714 return;
715 }
716 // Loading AliRun master
717 rl->LoadgAlice();
718 gAlice = rl->GetAliRun();
719
720 // Loading MUON subsystem
721 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
722
f69d51b5 723 nTRentries = Int_t(TR->GetEntries());
724 if (nTRentries != 1) {
725 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
726 << endl;
727 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
728 exit(0);
729 }
88cb7938 730 gime->TreeR()->GetEvent(0); // only one entry
a9e2aefa 731 // Loop over tracking chambers
9cbdf048 732 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 733 // number of HitsForRec to 0 for the chamber
734 fNHitsForRecPerChamber[ch] = 0;
735 // index of first HitForRec for the chamber
736 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
737 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
ce3f5e87 738 rawclusters = pMUON->GetMUONData()->RawClusters(ch);
f69d51b5 739// pMUON->ResetRawClusters();
740// TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
a9e2aefa 741 nclus = (Int_t) (rawclusters->GetEntries());
742 // Loop over (cathode correlated) raw clusters
743 for (iclus = 0; iclus < nclus; iclus++) {
744 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
745 // new AliMUONHitForRec from raw cluster
746 // and increment number of AliMUONHitForRec's (total and in chamber)
747 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
748 fNHitsForRec++;
749 (fNHitsForRecPerChamber[ch])++;
750 // more information into HitForRec
751 // resolution: info should be already in raw cluster and taken from it ????
752 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
753 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
754 // original raw cluster
755 hitForRec->SetChamberNumber(ch);
756 hitForRec->SetHitNumber(iclus);
ba5b68db 757 // Z coordinate of the raw cluster (cm)
cfe0107f 758 hitForRec->SetZ(clus->fZ[0]);
a9e2aefa 759 if (fPrintLevel >= 10) {
760 cout << "chamber (0...): " << ch <<
761 " raw cluster (0...): " << iclus << endl;
762 clus->Dump();
763 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
764 hitForRec->Dump();}
765 } // end of cluster loop
766 } // end of chamber loop
83dbc640 767 SortHitsForRecWithIncreasingChamber(); //AZ
a9e2aefa 768 return;
769}
770
771 //__________________________________________________________________________
772void AliMUONEventReconstructor::MakeSegments(void)
773{
774 // To make the list of segments in all stations,
775 // from the list of hits to be reconstructed
776 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
777 ResetSegments();
778 // Loop over stations
83dbc640 779 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
780 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
781 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
a9e2aefa 782 MakeSegmentsPerStation(st);
783 if (fPrintLevel >= 10) {
784 cout << "end of MakeSegments" << endl;
9cbdf048 785 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 786 cout << "station(0...): " << st
787 << " Segments: " << fNSegments[st]
788 << endl;
789 for (Int_t seg = 0;
790 seg < fNSegments[st];
791 seg++) {
792 cout << "Segment index(0...): " << seg << endl;
793 ((*fSegmentsPtr[st])[seg])->Dump();
794 }
795 }
796 }
797 return;
798}
799
800 //__________________________________________________________________________
801void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
802{
803 // To make the list of segments in station number "Station" (0...)
804 // from the list of hits to be reconstructed.
805 // Updates "fNSegments"[Station].
806 // Segments in stations 4 and 5 are sorted
807 // according to increasing absolute value of "impact parameter"
808 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
809 AliMUONSegment *segment;
810 Bool_t last2st;
811 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
d0bfce8d 812 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 813 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 814 if (fPrintLevel >= 1)
815 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
816 // first and second chambers (0...) in the station
817 Int_t ch1 = 2 * Station;
818 Int_t ch2 = ch1 + 1;
819 // variable true for stations downstream of the dipole:
820 // Station(0..4) equal to 3 or 4
821 if ((Station == 3) || (Station == 4)) {
822 last2st = kTRUE;
823 // maximum impact parameter (cm) according to fMinBendingMomentum...
824 maxImpactParam =
825 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
d0bfce8d 826 // minimum impact parameter (cm) according to fMaxBendingMomentum...
827 minImpactParam =
828 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
a9e2aefa 829 }
830 else last2st = kFALSE;
831 // extrapolation factor from Z of first chamber to Z of second chamber
832 // dZ to be changed to take into account fine structure of chambers ????
833 Double_t extrapFact =
9cbdf048 834 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 835 // index for current segment
836 Int_t segmentIndex = 0;
837 // Loop over HitsForRec in the first chamber of the station
838 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
839 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
840 hit1++) {
841 // pointer to the HitForRec
842 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
843 // extrapolation,
844 // on the straight line joining the HitForRec to the vertex (0,0,0),
845 // to the Z of the second chamber of the station
846 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
847 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
848 // Loop over HitsForRec in the second chamber of the station
849 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
850 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
851 hit2++) {
852 // pointer to the HitForRec
853 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
854 // absolute values of distances, in bending and non bending planes,
855 // between the HitForRec in the second chamber
856 // and the previous extrapolation
857 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
858 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
859 if (last2st) {
860 // bending slope
861 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
862 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
863 // absolute value of impact parameter
864 impactParam =
31817925 865 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
a9e2aefa 866 }
867 // check for distances not too large,
868 // and impact parameter not too big if stations downstream of the dipole.
869 // Conditions "distBend" and "impactParam" correlated for these stations ????
870 if ((distBend < fSegmentMaxDistBending[Station]) &&
871 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
d0bfce8d 872 (!last2st || (impactParam < maxImpactParam)) &&
873 (!last2st || (impactParam > minImpactParam))) {
a9e2aefa 874 // make new segment
875 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
876 AliMUONSegment(hit1Ptr, hit2Ptr);
877 // update "link" to this segment from the hit in the first chamber
878 if (hit1Ptr->GetNSegments() == 0)
879 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
880 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
881 if (fPrintLevel >= 10) {
882 cout << "segmentIndex(0...): " << segmentIndex
883 << " distBend: " << distBend
884 << " distNonBend: " << distNonBend
885 << endl;
886 segment->Dump();
887 cout << "HitForRec in first chamber" << endl;
888 hit1Ptr->Dump();
889 cout << "HitForRec in second chamber" << endl;
890 hit2Ptr->Dump();
891 };
892 // increment index for current segment
893 segmentIndex++;
894 }
895 } //for (Int_t hit2
896 } // for (Int_t hit1...
897 fNSegments[Station] = segmentIndex;
898 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
899 // i.e. Station(0..4) 3 or 4, using the function "Compare".
900 // After this sorting, it is impossible to use
901 // the "fNSegments" and "fIndexOfFirstSegment"
902 // of the HitForRec in the first chamber to explore all segments formed with it.
903 // Is this sorting really needed ????
904 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
905 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
906 << fNSegments[Station] << endl;
907 return;
908}
909
910 //__________________________________________________________________________
911void AliMUONEventReconstructor::MakeTracks(void)
912{
913 // To make the tracks,
914 // from the list of segments and points in all stations
915 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 916 // The order may be important for the following Reset's
a9e2aefa 917 ResetTracks();
8429a5e4 918 ResetTrackHits();
83dbc640 919 if (fTrackMethod == 2) { //AZ - Kalman filter
920 MakeTrackCandidatesK();
921 // Follow tracks in stations(1..) 3, 2 and 1
922 FollowTracksK();
923 // Remove double tracks
924 RemoveDoubleTracksK();
925 // Propagate tracks to the vertex thru absorber
926 GoToVertex();
927 } else { //AZ
928 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
929 MakeTrackCandidates();
930 // Follow tracks in stations(1..) 3, 2 and 1
931 FollowTracks();
932 // Remove double tracks
933 RemoveDoubleTracks();
934 }
a9e2aefa 935 return;
936}
937
938 //__________________________________________________________________________
939Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
940{
941 // To make track candidates with two segments in stations(1..) 4 and 5,
942 // the first segment being pointed to by "BegSegment".
943 // Returns the number of such track candidates.
944 Int_t endStation, iEndSegment, nbCan2Seg;
945 AliMUONSegment *endSegment, *extrapSegment;
946 AliMUONTrack *recTrack;
947 Double_t mcsFactor;
948 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
949 // Station for the end segment
950 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
951 // multiple scattering factor corresponding to one chamber
952 mcsFactor = 0.0136 /
953 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
954 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
955 // linear extrapolation to end station
956 extrapSegment =
957 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
958 // number of candidates with 2 segments to 0
959 nbCan2Seg = 0;
960 // Loop over segments in the end station
961 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
962 // pointer to segment
963 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
964 // test compatibility between current segment and "extrapSegment"
04b5ea16 965 // 4 because 4 quantities in chi2
a9e2aefa 966 if ((endSegment->
967 NormalizedChi2WithSegment(extrapSegment,
968 fMaxSigma2Distance)) <= 4.0) {
969 // both segments compatible:
970 // make track candidate from "begSegment" and "endSegment"
971 if (fPrintLevel >= 2)
972 cout << "TrackCandidate with Segment " << iEndSegment <<
973 " in Station(0..) " << endStation << endl;
974 // flag for both segments in one track:
975 // to be done in track constructor ????
976 BegSegment->SetInTrack(kTRUE);
977 endSegment->SetInTrack(kTRUE);
978 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
979 AliMUONTrack(BegSegment, endSegment, this);
980 fNRecTracks++;
981 if (fPrintLevel >= 10) recTrack->RecursiveDump();
982 // increment number of track candidates with 2 segments
983 nbCan2Seg++;
984 }
985 } // for (iEndSegment = 0;...
986 delete extrapSegment; // should not delete HitForRec's it points to !!!!
987 return nbCan2Seg;
988}
989
990 //__________________________________________________________________________
991Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
992{
993 // To make track candidates with one segment and one point
994 // in stations(1..) 4 and 5,
995 // the segment being pointed to by "BegSegment".
996 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
997 AliMUONHitForRec *extrapHitForRec, *hit;
998 AliMUONTrack *recTrack;
999 Double_t mcsFactor;
1000 if (fPrintLevel >= 1)
1001 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1002 // station for the end point
1003 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1004 // multiple scattering factor corresponding to one chamber
1005 mcsFactor = 0.0136 /
1006 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1007 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1008 // first and second chambers(0..) in the end station
1009 ch1 = 2 * endStation;
1010 ch2 = ch1 + 1;
1011 // number of candidates to 0
1012 nbCan1Seg1Hit = 0;
1013 // Loop over chambers of the end station
1014 for (ch = ch2; ch >= ch1; ch--) {
1015 // linear extrapolation to chamber
1016 extrapHitForRec =
1017 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1018 // limits for the hit index in the loop
1019 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1020 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1021 // Loop over HitForRec's in the chamber
1022 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1023 // pointer to HitForRec
1024 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1025 // test compatibility between current HitForRec and "extrapHitForRec"
04b5ea16 1026 // 2 because 2 quantities in chi2
a9e2aefa 1027 if ((hit->
1028 NormalizedChi2WithHitForRec(extrapHitForRec,
1029 fMaxSigma2Distance)) <= 2.0) {
1030 // both HitForRec's compatible:
1031 // make track candidate from begSegment and current HitForRec
1032 if (fPrintLevel >= 2)
1033 cout << "TrackCandidate with HitForRec " << iHit <<
1034 " in Chamber(0..) " << ch << endl;
1035 // flag for beginning segments in one track:
1036 // to be done in track constructor ????
1037 BegSegment->SetInTrack(kTRUE);
1038 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1039 AliMUONTrack(BegSegment, hit, this);
1040 // the right place to eliminate "double counting" ???? how ????
1041 fNRecTracks++;
1042 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1043 // increment number of track candidates
1044 nbCan1Seg1Hit++;
1045 }
1046 } // for (iHit = iHitMin;...
1047 delete extrapHitForRec;
1048 } // for (ch = ch2;...
1049 return nbCan1Seg1Hit;
1050}
1051
1052 //__________________________________________________________________________
1053void AliMUONEventReconstructor::MakeTrackCandidates(void)
1054{
1055 // To make track candidates
1056 // with at least 3 aligned points in stations(1..) 4 and 5
1057 // (two Segment's or one Segment and one HitForRec)
1058 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1059 AliMUONSegment *begSegment;
1060 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1061 // Loop over stations(1..) 5 and 4 for the beginning segment
1062 for (begStation = 4; begStation > 2; begStation--) {
1063 // Loop over segments in the beginning station
1064 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1065 // pointer to segment
1066 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1067 if (fPrintLevel >= 2)
1068 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1069 " in Station(0..) " << begStation << endl;
1070 // Look for track candidates with two segments,
1071 // "begSegment" and all compatible segments in other station.
1072 // Only for beginning station(1..) 5
1073 // because candidates with 2 segments have to looked for only once.
1074 if (begStation == 4)
1075 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
956019b6 1076 // Look for track candidates with one segment and one point,
a9e2aefa 1077 // "begSegment" and all compatible HitForRec's in other station.
1078 // Only if "begSegment" does not belong already to a track candidate.
1079 // Is that a too strong condition ????
1080 if (!(begSegment->GetInTrack()))
1081 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1082 } // for (iBegSegment = 0;...
1083 } // for (begStation = 4;...
1084 return;
1085}
1086
1087 //__________________________________________________________________________
1088void AliMUONEventReconstructor::FollowTracks(void)
1089{
1090 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1091 // too long: should be made more modular !!!!
d0bfce8d 1092 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1093 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
04b5ea16 1094 AliMUONTrack *track, *nextTrack;
1095 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1096 // -1 to avoid compilation warnings
1097 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1098 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
d0bfce8d 1099 Double_t bendingMomentum, chi2Norm = 0.;
9cbdf048 1100 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1101 // local maxSigma2Distance, for easy increase in testing
1102 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1103 if (fPrintLevel >= 2)
1104 cout << "enter FollowTracks" << endl;
1105 // Loop over track candidates
04b5ea16 1106 track = (AliMUONTrack*) fRecTracksPtr->First();
1107 trackIndex = -1;
1108 while (track) {
1109 // Follow function for each track candidate ????
1110 trackIndex++;
1111 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1112 if (fPrintLevel >= 2)
1113 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 1114 // Fit track candidate
1115 track->SetFitMCS(0); // without multiple Coulomb scattering
1116 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1117 track->SetFitStart(0); // from parameters at vertex
1118 track->Fit();
a9e2aefa 1119 if (fPrintLevel >= 10) {
1120 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1121 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1122 track->RecursiveDump();
1123 }
1124 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1125 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1126 // otherwise: majority coincidence 2 !!!!
a9e2aefa 1127 for (station = 2; station >= 0; station--) {
1128 // Track parameters at first track hit (smallest Z)
1129 trackParam1 = ((AliMUONTrackHit*)
1130 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1131 // extrapolation to station
1132 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 1133 extrapSegment = new AliMUONSegment(); // empty segment
d0bfce8d 1134 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
a9e2aefa 1135 // multiple scattering factor corresponding to one chamber
1136 // and momentum in bending plane (not total)
1137 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1138 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1139 // Z difference from previous station
9cbdf048 1140 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1141 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1142 // Z difference between the two previous stations
9cbdf048 1143 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1144 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 1145 // Z difference between the two chambers in the previous station
1146 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1147 (&(pMUON->Chamber(2 * station + 1)))->Z();
1148 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1149 extrapSegment->
1150 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1151 extrapSegment->UpdateFromStationTrackParam
1152 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1153 trackParam1->GetInverseBendingMomentum());
d0bfce8d 1154 // same thing for corrected segment
1155 // better to use copy constructor, after checking that it works properly !!!!
1156 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1157 extrapCorrSegment->
1158 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1159 extrapCorrSegment->UpdateFromStationTrackParam
1160 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1161 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1162 bestChi2 = 5.0;
1163 bestSegment = NULL;
1164 if (fPrintLevel >= 10) {
1165 cout << "FollowTracks: track candidate(0..): " << trackIndex
1166 << " Look for segment in station(0..): " << station << endl;
1167 }
1168 // Loop over segments in station
1169 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1170 // Look for best compatible Segment in station
1171 // should consider all possibilities ????
1172 // multiple scattering ????
1173 // separation in 2 functions: Segment and HitForRec ????
1174 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
d0bfce8d 1175 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1176 // according to real Z value of "segment" and slopes of "extrapSegment"
1177 extrapCorrSegment->
1178 SetBendingCoor(extrapSegment->GetBendingCoor() +
1179 extrapSegment->GetBendingSlope() *
1180 (segment->GetHitForRec1()->GetZ() -
1181 (&(pMUON->Chamber(2 * station)))->Z()));
1182 extrapCorrSegment->
1183 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1184 extrapSegment->GetNonBendingSlope() *
1185 (segment->GetHitForRec1()->GetZ() -
1186 (&(pMUON->Chamber(2 * station)))->Z()));
1187 chi2 = segment->
1188 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
a9e2aefa 1189 if (chi2 < bestChi2) {
1190 // update best Chi2 and Segment if better found
1191 bestSegment = segment;
1192 bestChi2 = chi2;
1193 }
1194 }
1195 if (bestSegment) {
1196 // best segment found: add it to track candidate
1197 track->AddSegment(bestSegment);
1198 // set track parameters at these two TrakHit's
1199 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1200 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1201 if (fPrintLevel >= 10) {
1202 cout << "FollowTracks: track candidate(0..): " << trackIndex
1203 << " Added segment in station(0..): " << station << endl;
1204 track->RecursiveDump();
1205 }
1206 }
1207 else {
1208 // No best segment found:
1209 // Look for best compatible HitForRec in station:
1210 // should consider all possibilities ????
1211 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1212 extrapHit = new AliMUONHitForRec(); // empty hit
d0bfce8d 1213 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
a9e2aefa 1214 bestChi2 = 3.0;
1215 bestHit = NULL;
1216 if (fPrintLevel >= 10) {
1217 cout << "FollowTracks: track candidate(0..): " << trackIndex
1218 << " Segment not found, look for hit in station(0..): " << station
1219 << endl;
1220 }
1221 // Loop over chambers of the station
d82671a0 1222 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1223 // coordinates of extrapolated hit
d82671a0 1224 extrapHit->
1225 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1226 extrapHit->
1227 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1228 // resolutions from "extrapSegment"
1229 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1230 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
d0bfce8d 1231 // same things for corrected hit
1232 // better to use copy constructor, after checking that it works properly !!!!
1233 extrapCorrHit->
1234 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1235 extrapCorrHit->
1236 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1237 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1238 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
a9e2aefa 1239 // Loop over hits in the chamber
956019b6 1240 ch = 2 * station + chInStation;
a9e2aefa 1241 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1242 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1243 fNHitsForRecPerChamber[ch];
1244 iHit++) {
1245 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
d0bfce8d 1246 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1247 // according to real Z value of "hit" and slopes of right "trackParam"
1248 extrapCorrHit->
1249 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1250 (&(trackParam[chInStation]))->GetBendingSlope() *
1251 (hit->GetZ() -
1252 (&(trackParam[chInStation]))->GetZ()));
1253 extrapCorrHit->
1254 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1255 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1256 (hit->GetZ() -
1257 (&(trackParam[chInStation]))->GetZ()));
a9e2aefa 1258 // condition for hit not already in segment ????
1259 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1260 if (chi2 < bestChi2) {
1261 // update best Chi2 and HitForRec if better found
1262 bestHit = hit;
1263 bestChi2 = chi2;
d82671a0 1264 chBestHit = chInStation;
a9e2aefa 1265 }
1266 }
1267 }
1268 if (bestHit) {
1269 // best hit found: add it to track candidate
1270 track->AddHitForRec(bestHit);
956019b6 1271 // set track parameters at this TrackHit
a9e2aefa 1272 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1273 &(trackParam[chBestHit]));
1274 if (fPrintLevel >= 10) {
1275 cout << "FollowTracks: track candidate(0..): " << trackIndex
1276 << " Added hit in station(0..): " << station << endl;
1277 track->RecursiveDump();
1278 }
1279 }
1280 else {
8429a5e4 1281 // Remove current track candidate
1282 // and corresponding TrackHit's, ...
1283 track->Remove();
04b5ea16 1284 delete extrapSegment;
d0bfce8d 1285 delete extrapCorrSegment;
1286 delete extrapHit;
1287 delete extrapCorrHit;
a9e2aefa 1288 break; // stop the search for this candidate:
1289 // exit from the loop over station
1290 }
d0bfce8d 1291 delete extrapHit;
1292 delete extrapCorrHit;
a9e2aefa 1293 }
04b5ea16 1294 delete extrapSegment;
d0bfce8d 1295 delete extrapCorrSegment;
a9e2aefa 1296 // Sort track hits according to increasing Z
1297 track->GetTrackHitsPtr()->Sort();
1298 // Update track parameters at first track hit (smallest Z)
1299 trackParam1 = ((AliMUONTrackHit*)
1300 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
d0bfce8d 1301 bendingMomentum = 0.;
1302 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1303 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1304 // Track removed if bendingMomentum not in window [min, max]
1305 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1306 track->Remove();
1307 break; // stop the search for this candidate:
1308 // exit from the loop over station
1309 }
956019b6 1310 // Track fit
04b5ea16 1311 // with multiple Coulomb scattering if all stations
1312 if (station == 0) track->SetFitMCS(1);
956019b6 1313 // without multiple Coulomb scattering if not all stations
04b5ea16 1314 else track->SetFitMCS(0);
956019b6 1315 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1316 track->SetFitStart(1); // from parameters at first hit
1317 track->Fit();
d0bfce8d 1318 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1319 if (numberOfDegFree > 0) {
1320 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1321 } else {
1322 chi2Norm = 1.e10;
1323 }
1324 // Track removed if normalized chi2 too high
1325 if (chi2Norm > fMaxChi2) {
1326 track->Remove();
1327 break; // stop the search for this candidate:
1328 // exit from the loop over station
1329 }
a9e2aefa 1330 if (fPrintLevel >= 10) {
1331 cout << "FollowTracks: track candidate(0..): " << trackIndex
1332 << " after fit from station(0..): " << station << " to 4" << endl;
1333 track->RecursiveDump();
1334 }
04b5ea16 1335 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1336 // after going through the first station
04b5ea16 1337 if (station == 0) {
1338 trackParamVertex = *trackParam1;
1339 (&trackParamVertex)->ExtrapToVertex();
1340 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1341 if (fPrintLevel >= 1) {
1342 cout << "FollowTracks: track candidate(0..): " << trackIndex
1343 << " after extrapolation to vertex" << endl;
1344 track->RecursiveDump();
1345 }
04b5ea16 1346 }
a9e2aefa 1347 } // for (station = 2;...
04b5ea16 1348 // go really to next track
1349 track = nextTrack;
1350 } // while (track)
1351 // Compression of track array (necessary after Remove ????)
1352 fRecTracksPtr->Compress();
1353 return;
1354}
1355
1356 //__________________________________________________________________________
8429a5e4 1357void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1358{
1359 // To remove double tracks.
1360 // Tracks are considered identical
1361 // if they have at least half of their hits in common.
1362 // Among two identical tracks, one keeps the track with the larger number of hits
1363 // or, if these numbers are equal, the track with the minimum Chi2.
1364 AliMUONTrack *track1, *track2, *trackToRemove;
1365 Bool_t identicalTracks;
1366 Int_t hitsInCommon, nHits1, nHits2;
1367 identicalTracks = kTRUE;
1368 while (identicalTracks) {
1369 identicalTracks = kFALSE;
1370 // Loop over first track of the pair
1371 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1372 while (track1 && (!identicalTracks)) {
1373 nHits1 = track1->GetNTrackHits();
1374 // Loop over second track of the pair
1375 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1376 while (track2 && (!identicalTracks)) {
1377 nHits2 = track2->GetNTrackHits();
1378 // number of hits in common between two tracks
1379 hitsInCommon = track1->HitsInCommon(track2);
1380 // check for identical tracks
1381 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1382 identicalTracks = kTRUE;
1383 // decide which track to remove
1384 if (nHits1 > nHits2) trackToRemove = track2;
1385 else if (nHits1 < nHits2) trackToRemove = track1;
1386 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1387 trackToRemove = track2;
1388 else trackToRemove = track1;
1389 // remove it
1390 trackToRemove->Remove();
1391 }
1392 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1393 } // track2
1394 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1395 } // track1
1396 }
1397 return;
1398}
1399
1400 //__________________________________________________________________________
04b5ea16 1401void AliMUONEventReconstructor::EventDump(void)
1402{
1403 // Dump reconstructed event (track parameters at vertex and at first hit),
1404 // and the particle parameters
1405
1406 AliMUONTrack *track;
1407 AliMUONTrackParam *trackParam, *trackParam1;
04b5ea16 1408 Double_t bendingSlope, nonBendingSlope, pYZ;
1409 Double_t pX, pY, pZ, x, y, z, c;
1410 Int_t np, trackIndex, nTrackHits;
1411
1412 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1413 if (fPrintLevel >= 1) {
1414 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1415 }
1416 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1417 // Loop over reconstructed tracks
1418 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
83dbc640 1419 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
04b5ea16 1420 if (fPrintLevel >= 1)
1421 cout << " track number: " << trackIndex << endl;
1422 // function for each track for modularity ????
1423 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1424 nTrackHits = track->GetNTrackHits();
1425 if (fPrintLevel >= 1)
1426 cout << " number of track hits: " << nTrackHits << endl;
1427 // track parameters at Vertex
1428 trackParam = track->GetTrackParamAtVertex();
1429 x = trackParam->GetNonBendingCoor();
1430 y = trackParam->GetBendingCoor();
1431 z = trackParam->GetZ();
1432 bendingSlope = trackParam->GetBendingSlope();
1433 nonBendingSlope = trackParam->GetNonBendingSlope();
1434 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1435 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1436 pX = pZ * nonBendingSlope;
1437 pY = pZ * bendingSlope;
1438 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1439 if (fPrintLevel >= 1)
1440 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1441 z, x, y, pX, pY, pZ, c);
1442
1443 // track parameters at first hit
1444 trackParam1 = ((AliMUONTrackHit*)
1445 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1446 x = trackParam1->GetNonBendingCoor();
1447 y = trackParam1->GetBendingCoor();
1448 z = trackParam1->GetZ();
1449 bendingSlope = trackParam1->GetBendingSlope();
1450 nonBendingSlope = trackParam1->GetNonBendingSlope();
1451 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1452 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1453 pX = pZ * nonBendingSlope;
1454 pY = pZ * bendingSlope;
1455 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1456 if (fPrintLevel >= 1)
1457 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1458 z, x, y, pX, pY, pZ, c);
1459 }
1460 // informations about generated particles
5d12ce38 1461 np = gAlice->GetMCApp()->GetNtrack();
04b5ea16 1462 printf(" **** number of generated particles: %d \n", np);
1463
88cb7938 1464// for (Int_t iPart = 0; iPart < np; iPart++) {
1465// p = gAlice->Particle(iPart);
1466// printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1467// iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1468// }
a9e2aefa 1469 return;
1470}
1471
c7ba256d 1472void AliMUONEventReconstructor::FillEvent()
1473{
1474// Create a new AliMUONRecoEvent, fill its track list, then add it as a
1475// leaf in the Event branch of TreeRecoEvent tree
1476 cout << "Enter FillEvent() ...\n";
1477
1478 if (!fRecoEvent) {
1479 fRecoEvent = new AliMUONRecoEvent();
1480 } else {
1481 fRecoEvent->Clear();
1482 }
1483 //save current directory
1484 TDirectory *current = gDirectory;
1485 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1486 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
83dbc640 1487 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1488 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
c7ba256d 1489 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1490 TBranch *branch = fEventTree->GetBranch("Event");
d0f40f23 1491 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
c7ba256d 1492 branch->SetAutoDelete();
1493 fTreeFile->cd();
1494 fEventTree->Fill();
1495 fTreeFile->Write();
1496 }
1497 // restore directory
1498 current->cd();
1499}
83dbc640 1500
1501//__________________________________________________________________________
1502void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1503{
1504 // To make initial tracks for Kalman filter from the list of segments
1505 Int_t istat, iseg;
1506 AliMUONSegment *segment;
1507 AliMUONTrackK *trackK;
1508
1509 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1510 // Reset the TClonesArray of reconstructed tracks
1511 if (fRecTracksPtr) fRecTracksPtr->Delete();
1512 // Delete in order that the Track destructors are called,
1513 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1514 fNRecTracks = 0;
1515
1516 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1517 // Loop over stations(1...) 5 and 4
1518 for (istat=4; istat>=3; istat--) {
1519 // Loop over segments in the station
1520 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1521 // Transform segments to tracks and evaluate covariance matrix
1522 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1523 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1524 fNRecTracks++;
1525 } // for (iseg=0;...)
1526 } // for (istat=4;...)
1527 return;
1528}
1529
1530//__________________________________________________________________________
1531void AliMUONEventReconstructor::FollowTracksK(void)
1532{
1533 // Follow tracks using Kalman filter
1534 Bool_t Ok;
1535 Int_t icand, ichamBeg, ichamEnd, chamBits;
1536 Double_t zDipole1, zDipole2;
1537 AliMUONTrackK *trackK;
1538 AliMUONHitForRec *hit;
1539 AliMUONRawCluster *clus;
1540 TClonesArray *rawclusters;
1541 AliMUON *pMUON;
1542 clus = 0; rawclusters = 0;
1543
1544 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1545 zDipole2 = zDipole1 + GetSimpleBLength();
1546
1547 // Print hits
1548 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1549 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1550 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1551 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1552 /*
1553 cout << " Hit #" << hit->GetChamberNumber() << " ";
1554 cout << hit->GetBendingCoor() << " ";
1555 cout << hit->GetNonBendingCoor() << " ";
1556 cout << hit->GetZ() << " ";
1557 cout << hit->GetGeantSignal() << " ";
1558 cout << hit->GetTHTrack() << endl;
1559 */
1560 /*
1561 printf(" Hit # %d %10.4f %10.4f %10.4f",
1562 hit->GetChamberNumber(), hit->GetBendingCoor(),
1563 hit->GetNonBendingCoor(), hit->GetZ());
1564 if (fRecGeantHits) {
1565 // from GEANT hits
1566 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1567 } else {
1568 // from raw clusters
1569 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1570 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1571 GetHitNumber());
1572 printf("%3d", clus->fTracks[1]-1);
1573 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1574 else printf("\n");
1575 }
1576 */
1577 }
1578
1579 icand = -1;
1580 Int_t nSeeds = fNRecTracks; // starting number of seeds
1581 // Loop over track candidates
1582 while (icand < fNRecTracks-1) {
1583 icand ++;
1584 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1585
1586 // Discard candidate which will produce the double track
1587 if (icand > 0) {
1588 Ok = CheckCandidateK(icand,nSeeds);
1589 if (!Ok) {
1590 //trackK->SetRecover(-1); // mark candidate to be removed
1591 //continue;
1592 }
1593 }
1594
1595 Ok = kTRUE;
1596 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1597 trackK->GetHitOnTrack()->Last(); // last hit
1598 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1599 ichamBeg = hit->GetChamberNumber();
1600 ichamEnd = 0;
1601 // Check propagation direction
1602 if (trackK->GetTrackDir() > 0) {
1603 ichamEnd = 9; // forward propagation
1604 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1605 if (Ok) {
1606 ichamBeg = ichamEnd;
1607 ichamEnd = 6; // backward propagation
1608 // Change weight matrix and zero fChi2 for backpropagation
1609 trackK->StartBack();
1610 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1611 ichamBeg = ichamEnd;
1612 ichamEnd = 0;
1613 }
1614 } else {
1615 if (trackK->GetBPFlag()) {
1616 // backpropagation
1617 ichamEnd = 6; // backward propagation
1618 // Change weight matrix and zero fChi2 for backpropagation
1619 trackK->StartBack();
1620 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1621 ichamBeg = ichamEnd;
1622 ichamEnd = 0;
1623 }
1624 }
1625
1626 if (Ok) {
1627 trackK->SetTrackDir(-1);
1628 trackK->SetBPFlag(kFALSE);
1629 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1630 }
1631 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1632 else trackK->SetRecover(-1); // mark candidate to be removed
1633
1634 // Majority 3 of 4 in first 2 stations
1635 chamBits = 0;
1636 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1637 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1638 chamBits |= BIT(hit->GetChamberNumber()-1);
1639 }
1640 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1641 //mark candidate to be removed
1642 } // while
1643
1644 for (Int_t i=0; i<fNRecTracks; i++) {
1645 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1646 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1647 }
1648
1649 // Compress TClonesArray
1650 fRecTracksPtr->Compress();
1651 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1652 return;
1653}
1654
1655//__________________________________________________________________________
1656Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1657{
1658 // Discards track candidate if it will produce the double track (having
1659 // the same seed segment hits as hits of a good track found before)
1660 AliMUONTrackK *track1, *track2;
1661 AliMUONHitForRec *hit1, *hit2, *hit;
1662
1663 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1664 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1665 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1666
1667 for (Int_t i=0; i<icand; i++) {
1668 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1669 //if (track2->GetRecover() < 0) continue;
1670 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1671
1672 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1673 return kFALSE;
1674 } else {
1675 Int_t nSame = 0;
1676 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1677 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1678 if (hit == hit1 || hit == hit2) {
1679 nSame++;
1680 if (nSame == 2) return kFALSE;
1681 }
1682 } // for (Int_t j=0;
1683 }
1684 } // for (Int_t i=0;
1685 return kTRUE;
1686}
1687
1688//__________________________________________________________________________
1689void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1690{
1691 // Removes double tracks (sharing more than half of their hits). Keeps
1692 // the track with higher quality
1693 AliMUONTrackK *track1, *track2, *trackToKill;
1694
1695 // Sort tracks according to their quality
1696 fRecTracksPtr->Sort();
1697
1698 // Loop over first track of the pair
1699 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1700 while (track1) {
1701 // Loop over second track of the pair
1702 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1703 while (track2) {
1704 // Check whether or not to keep track2
1705 if (!track2->KeepTrack(track1)) {
1706 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1707 " " << track2->GetTrackQuality() << endl;
1708 trackToKill = track2;
1709 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1710 trackToKill->Kill();
1711 fRecTracksPtr->Compress();
1712 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1713 } // track2
1714 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1715 } // track1
1716
1717 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1718 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1719}
1720
1721//__________________________________________________________________________
1722void AliMUONEventReconstructor::GoToVertex(void)
1723{
1724 // Propagates track to the vertex thru absorber
1725 // (using Branson correction for now)
1726
1727 Double_t zVertex;
1728 zVertex = 0;
1729 for (Int_t i=0; i<fNRecTracks; i++) {
1730 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1731 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1732 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1733 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber
1734 }
1735}