1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ////////////////////////////////////
20 // MUON event reconstructor in ALICE
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
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
33 ////////////////////////////////////
35 #include <Riostream.h> // for cout
36 #include <stdlib.h> // for exit()
41 #include "AliMUONChamber.h"
42 #include "AliMUONEventReconstructor.h"
43 #include "AliMUONHitForRec.h"
44 #include "AliMUONTriggerTrack.h"
45 //#include "AliMUONTriggerConstants.h"
46 #include "AliMUONTriggerCircuit.h"
47 #include "AliMUONRawCluster.h"
48 #include "AliMUONGlobalTrigger.h"
49 #include "AliMUONLocalTrigger.h"
50 #include "AliMUONRecoEvent.h"
51 #include "AliMUONSegment.h"
52 #include "AliMUONTrack.h"
53 #include "AliMUONTrackHit.h"
55 #include "AliRun.h" // for gAlice
56 #include "AliConfig.h"
57 #include "AliRunLoader.h"
58 #include "AliLoader.h"
59 #include "AliMUONTrackK.h" //AZ
60 #include <TMatrixD.h> //AZ
63 //************* Defaults parameters for reconstruction
64 static const Double_t kDefaultMinBendingMomentum = 3.0;
65 static const Double_t kDefaultMaxBendingMomentum = 500.0;
66 static const Double_t kDefaultMaxChi2 = 100.0;
67 static const Double_t kDefaultMaxSigma2Distance = 16.0;
68 static const Double_t kDefaultBendingResolution = 0.01;
69 static const Double_t kDefaultNonBendingResolution = 0.144;
70 static const Double_t kDefaultChamberThicknessInX0 = 0.03;
71 // Simple magnetic field:
72 // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
73 // Length and Position from reco_muon.F, with opposite sign:
74 // Length = ZMAGEND-ZCOIL
75 // Position = (ZMAGEND+ZCOIL)/2
76 // to be ajusted differently from real magnetic field ????
77 static const Double_t kDefaultSimpleBValue = 7.0;
78 static const Double_t kDefaultSimpleBLength = 428.0;
79 static const Double_t kDefaultSimpleBPosition = 1019.0;
80 static const Int_t kDefaultRecGeantHits = 0;
81 static const Double_t kDefaultEfficiency = 0.95;
83 static const Int_t kDefaultPrintLevel = -1;
85 ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
87 //__________________________________________________________________________
88 AliMUONEventReconstructor::AliMUONEventReconstructor(void)
90 // Constructor for class AliMUONEventReconstructor
91 SetReconstructionParametersToDefaults();
92 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
93 // Memory allocation for the TClonesArray of hits for reconstruction
94 // Is 10000 the right size ????
95 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
96 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
97 // Memory allocation for the TClonesArray's of segments in stations
98 // Is 2000 the right size ????
99 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
100 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
101 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
103 // Memory allocation for the TClonesArray of reconstructed tracks
104 // Is 10 the right size ????
105 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
106 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
108 fRecTriggerTracksPtr = new TClonesArray("AliMUONTriggerTrack", 10);
109 fNRecTriggerTracks = 0; // really needed or GetEntriesFast sufficient ????
110 // Memory allocation for the TClonesArray of hits on reconstructed tracks
111 // Is 100 the right size ????
112 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
113 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
115 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
117 x[0] = 50.; x[1] = 50.; x[2] = -950.;
118 gAlice->Field()->Field(x, b);
119 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
120 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
121 // See how to get fSimple(BValue, BLength, BPosition)
122 // automatically calculated from the actual magnetic field ????
124 if (fPrintLevel >= 0) {
125 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
126 cout << endl << "Magnetic field from root file:" << endl;
127 gAlice->Field()->Dump();
131 // Initializions for GEANT background events
134 fBkgGeantParticles = 0;
137 fBkgGeantEventNumber = -1;
139 // Initialize to 0 pointers to RecoEvent, tree and tree file
147 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
149 // Dummy copy constructor
152 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
154 // Dummy assignment operator
158 //__________________________________________________________________________
159 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
161 // Destructor for class AliMUONEventReconstructor
166 // if (fEventTree) delete fEventTree;
167 if (fRecoEvent) delete fRecoEvent;
168 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
169 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
170 delete fSegmentsPtr[st]; // Correct destruction of everything ????
174 //__________________________________________________________________________
175 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
177 // Set reconstruction parameters to default values
178 // Would be much more convenient with a structure (or class) ????
179 fMinBendingMomentum = kDefaultMinBendingMomentum;
180 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
181 fMaxChi2 = kDefaultMaxChi2;
182 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
184 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
185 // ******** Parameters for making HitsForRec
187 // like in TRACKF_STAT:
188 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
189 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
190 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
191 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
192 2.0 * TMath::Pi() / 180.0;
193 else fRMin[ch] = 30.0;
194 // maximum radius at 10 degrees and Z of chamber
195 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
196 10.0 * TMath::Pi() / 180.0;
199 // ******** Parameters for making segments
200 // should be parametrized ????
201 // according to interval between chambers in a station ????
202 // Maximum distance in non bending plane
203 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
205 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
206 fSegmentMaxDistNonBending[st] = 5. * 0.22;
207 // Maximum distance in bending plane:
208 // values from TRACKF_STAT, corresponding to (J psi 20cm),
209 // scaled to the real distance between chambers in a station
210 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
211 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
212 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
213 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
214 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
215 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
216 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
217 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
218 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
219 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
221 fBendingResolution = kDefaultBendingResolution;
222 fNonBendingResolution = kDefaultNonBendingResolution;
223 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
224 fSimpleBValue = kDefaultSimpleBValue;
225 fSimpleBLength = kDefaultSimpleBLength;
226 fSimpleBPosition = kDefaultSimpleBPosition;
227 fRecGeantHits = kDefaultRecGeantHits;
228 fEfficiency = kDefaultEfficiency;
229 fPrintLevel = kDefaultPrintLevel;
233 //__________________________________________________________________________
234 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
236 // Returns impact parameter at vertex in bending plane (cm),
237 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
238 // using simple values for dipole magnetic field.
239 // The sign of "BendingMomentum" is the sign of the charge.
240 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
244 //__________________________________________________________________________
245 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
247 // Returns signed bending momentum in bending plane (GeV/c),
248 // the sign being the sign of the charge for particles moving forward in Z,
249 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
250 // using simple values for dipole magnetic field.
251 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
255 //__________________________________________________________________________
256 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
258 // Set background file ... for GEANT hits
259 // Must be called after having loaded the firts signal event
260 if (fPrintLevel >= 0) {
261 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
262 << BkgGeantFileName << "''" << endl;}
263 if (strlen(BkgGeantFileName)) {
264 // BkgGeantFileName not empty: try to open the file
265 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
266 fBkgGeantFile = new TFile(BkgGeantFileName);
267 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
268 if (fBkgGeantFile-> IsOpen()) {
269 if (fPrintLevel >= 0) {
270 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
271 << "'' successfully opened" << endl;}
274 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
275 cout << "NOT FOUND: EXIT" << endl;
276 exit(0); // right instruction for exit ????
278 // Arrays for "particles" and "hits"
279 fBkgGeantParticles = new TClonesArray("TParticle", 200);
280 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
281 // Event number to -1 for initialization
282 fBkgGeantEventNumber = -1;
283 // Back to the signal file:
284 // first signal event must have been loaded previously,
285 // otherwise, Segmentation violation at the next instruction
286 // How is it possible to do smething better ????
287 ((gAlice->TreeK())->GetCurrentFile())->cd();
288 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
293 //__________________________________________________________________________
294 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
296 // Get next event in background file for GEANT hits
297 // Goes back to event number 0 when end of file is reached
300 if (fPrintLevel >= 0) {
301 cout << "Enter NextBkgGeantEvent" << endl;}
302 // Clean previous event
303 if(fBkgGeantTK) delete fBkgGeantTK;
305 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
306 if(fBkgGeantTH) delete fBkgGeantTH;
308 if(fBkgGeantHits) fBkgGeantHits->Clear();
309 // Increment event number
310 fBkgGeantEventNumber++;
311 // Get access to Particles and Hits for event from background file
312 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
314 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
315 // Particles: TreeK for event and branch "Particles"
316 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
317 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
319 if (fPrintLevel >= 0) {
320 cout << "Cannot find Kine Tree for background event: " <<
321 fBkgGeantEventNumber << endl;
322 cout << "Goes back to event 0" << endl;
324 fBkgGeantEventNumber = 0;
325 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
326 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
328 cout << "ERROR: cannot find Kine Tree for background event: " <<
329 fBkgGeantEventNumber << endl;
334 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
335 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
336 // Hits: TreeH for event and branch "MUON"
337 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
338 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
340 cout << "ERROR: cannot find Hits Tree for background event: " <<
341 fBkgGeantEventNumber << endl;
344 if (fBkgGeantTH && fBkgGeantHits) {
345 branch = fBkgGeantTH->GetBranch("MUON");
346 if (branch) branch->SetAddress(&fBkgGeantHits);
348 fBkgGeantTH->GetEntries(); // necessary ????
349 // Back to the signal file
350 ((gAlice->TreeK())->GetCurrentFile())->cd();
351 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
355 //__________________________________________________________________________
356 void AliMUONEventReconstructor::EventReconstruct(void)
358 // To reconstruct one event
359 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
360 MakeEventToBeReconstructed();
366 //__________________________________________________________________________
367 void AliMUONEventReconstructor::EventReconstructTrigger(void)
369 // To reconstruct one event
370 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
375 //__________________________________________________________________________
376 void AliMUONEventReconstructor::ResetHitsForRec(void)
378 // To reset the array and the number of HitsForRec,
379 // and also the number of HitsForRec
380 // and the index of the first HitForRec per chamber
381 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
383 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
384 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
388 //__________________________________________________________________________
389 void AliMUONEventReconstructor::ResetSegments(void)
391 // To reset the TClonesArray of segments and the number of Segments
393 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
394 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
400 //__________________________________________________________________________
401 void AliMUONEventReconstructor::ResetTracks(void)
403 // To reset the TClonesArray of reconstructed tracks
404 if (fRecTracksPtr) fRecTracksPtr->Delete();
405 // Delete in order that the Track destructors are called,
406 // hence the space for the TClonesArray of pointers to TrackHit's is freed
411 //__________________________________________________________________________
412 void AliMUONEventReconstructor::ResetTriggerTracks(void)
414 // To reset the TClonesArray of reconstructed trigger tracks
415 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
416 // Delete in order that the Track destructors are called,
417 // hence the space for the TClonesArray of pointers to TrackHit's is freed
418 fNRecTriggerTracks = 0;
422 //__________________________________________________________________________
423 void AliMUONEventReconstructor::ResetTrackHits(void)
425 // To reset the TClonesArray of hits on reconstructed tracks
426 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
431 //__________________________________________________________________________
432 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
434 // To make the list of hits to be reconstructed,
435 // either from the GEANT hits or from the raw clusters
436 // according to the parameter set for the reconstructor
437 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
439 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
442 Error("MakeEventToBeReconstructed",
443 "Can not find Run Loader in Event Folder named %s.",
447 AliLoader* gime = rl->GetLoader("MUONLoader");
450 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
454 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
456 if (fRecGeantHits == 1) {
457 // Reconstruction from GEANT hits
458 // Back to the signal file
459 TTree* treeH = gime->TreeH();
462 Int_t retval = gime->LoadHits();
465 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
468 treeH = gime->TreeH();
471 Error("MakeEventToBeReconstructed","Can not get TreeH");
476 AddHitsForRecFromGEANT(treeH);
479 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
480 // Sort HitsForRec in increasing order with respect to chamber number
481 SortHitsForRecWithIncreasingChamber();
484 // Reconstruction from raw clusters
485 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
486 // Security on MUON ????
487 // TreeR assumed to be be "prepared" in calling function
488 // by "MUON->GetTreeR(nev)" ????
489 TTree *treeR = gime->TreeR();
490 AddHitsForRecFromRawClusters(treeR);
491 // No sorting: it is done automatically in the previous function
493 if (fPrintLevel >= 10) {
494 cout << "end of MakeEventToBeReconstructed" << endl;
495 cout << "NHitsForRec: " << fNHitsForRec << endl;
496 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
497 cout << "chamber(0...): " << ch
498 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
499 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
501 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
502 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
504 cout << "HitForRec index(0...): " << hit << endl;
505 ((*fHitsForRecPtr)[hit])->Dump();
512 //__________________________________________________________________________
513 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
515 // To add to the list of hits for reconstruction
516 // the GEANT signal hits from a hit tree TH.
517 Int_t hitBits, chamBits; //AZ
518 if (fPrintLevel >= 2)
519 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
520 if (TH == NULL) return;
521 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
522 AliMUONData * muondata = pMUON->GetMUONData();
523 // Security on MUON ????
524 // See whether it could be the same for signal and background ????
525 // Loop over tracks in tree
526 Int_t ntracks = (Int_t) TH->GetEntries();
527 if (fPrintLevel >= 2)
528 cout << "ntracks: " << ntracks << endl;
530 for (Int_t track = 0; track < ntracks; track++) {
531 muondata->ResetHits();
537 Int_t itrack = track; //AZ
540 nhits = (Int_t) muondata->Hits()->GetEntriesFast();
541 AliMUONHit* mHit=0x0;
543 for(ihit=0; ihit<nhits; ihit++) {
544 mHit = static_cast<AliMUONHit*>(muondata->Hits()->At(ihit));
545 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
546 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
547 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
548 && itrack <= 2 && !BIT(mHit->Chamber()-1) ) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
551 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
552 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
554 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
555 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
556 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
557 } // end of track loop
561 //__________________________________________________________________________
562 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
564 // To add to the list of hits for reconstruction
565 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
566 // How to have only one function "AddHitsForRecFromGEANT" ????
567 if (fPrintLevel >= 2)
568 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
569 if (TH == NULL) return;
570 // Loop over tracks in tree
571 Int_t ntracks = (Int_t) TH->GetEntries();
572 if (fPrintLevel >= 2)
573 cout << "ntracks: " << ntracks << endl;
574 for (Int_t track = 0; track < ntracks; track++) {
575 if (Hits) Hits->Clear();
578 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
579 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
581 } // end of track loop
585 //__________________________________________________________________________
586 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
588 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
589 // with hit number "HitNumber" in the track numbered "TrackNumber",
590 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
591 // Selects hits in tracking (not trigger) chambers.
592 // Takes into account the efficiency (fEfficiency)
593 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
594 // Adds a condition on the radius between RMin and RMax
595 // to better simulate the real chambers.
596 // Returns the pointer to the new hit for reconstruction,
597 // or NULL in case of inefficiency or non tracking chamber or bad radius.
598 // No condition on at most 20 cm from a muon from a resonance
599 // like in Fortran TRACKF_STAT.
600 AliMUONHitForRec* hitForRec;
601 Double_t bendCoor, nonBendCoor, radius;
602 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
603 // only in tracking chambers (fChamber starts at 1)
604 if (chamber >= kMaxMuonTrackingChambers) return NULL;
605 // only if hit is efficient (keep track for checking ????)
606 if (gRandom->Rndm() > fEfficiency) return NULL;
607 // only if radius between RMin and RMax
609 nonBendCoor = Hit->X();
610 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
611 // This cut is not needed with a realistic chamber geometry !!!!
612 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
613 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
614 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
616 // add smearing from resolution
617 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
618 hitForRec->SetNonBendingCoor(nonBendCoor
619 + gRandom->Gaus(0., fNonBendingResolution));
620 // // !!!! without smearing
621 // hitForRec->SetBendingCoor(bendCoor);
622 // hitForRec->SetNonBendingCoor(nonBendCoor);
623 // more information into HitForRec
624 // resolution: angular effect to be added here ????
625 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
626 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
628 hitForRec->SetHitNumber(HitNumber);
629 hitForRec->SetTHTrack(TrackNumber);
630 hitForRec->SetGeantSignal(Signal);
631 if (fPrintLevel >= 10) {
632 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
634 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
639 //__________________________________________________________________________
640 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
642 // Sort HitsForRec's in increasing order with respect to chamber number.
643 // Uses the function "Compare".
644 // Update the information for HitsForRec per chamber too.
645 Int_t ch, nhits, prevch;
646 fHitsForRecPtr->Sort();
647 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
648 fNHitsForRecPerChamber[ch] = 0;
649 fIndexOfFirstHitForRecPerChamber[ch] = 0;
651 prevch = 0; // previous chamber
652 nhits = 0; // number of hits in current chamber
653 // Loop over HitsForRec
654 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
655 // chamber number (0...)
656 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
657 // increment number of hits in current chamber
658 (fNHitsForRecPerChamber[ch])++;
659 // update index of first HitForRec in current chamber
660 // if chamber number different from previous one
662 fIndexOfFirstHitForRecPerChamber[ch] = hit;
669 // //__________________________________________________________________________
670 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
672 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
673 // // To add to the list of hits for reconstruction
674 // // the (cathode correlated) raw clusters
675 // // No condition added, like in Fortran TRACKF_STAT,
676 // // on the radius between RMin and RMax.
677 // AliMUONHitForRec *hitForRec;
678 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
679 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
680 // // Security on MUON ????
681 // // Loop over tracking chambers
682 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
683 // // number of HitsForRec to 0 for the chamber
684 // fNHitsForRecPerChamber[ch] = 0;
685 // // index of first HitForRec for the chamber
686 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
687 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
688 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
689 // MUON->ResetReconstHits();
691 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
692 // // Loop over (cathode correlated) raw clusters
693 // for (Int_t cor = 0; cor < ncor; cor++) {
694 // AliMUONReconstHit * mCor =
695 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
696 // // new AliMUONHitForRec from (cathode correlated) raw cluster
697 // // and increment number of AliMUONHitForRec's (total and in chamber)
698 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
700 // (fNHitsForRecPerChamber[ch])++;
701 // // more information into HitForRec
702 // hitForRec->SetChamberNumber(ch);
703 // hitForRec->SetHitNumber(cor);
704 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
705 // // could (should) be more exact from chamber geometry ????
706 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
707 // if (fPrintLevel >= 10) {
708 // cout << "chamber (0...): " << ch <<
709 // " cathcorrel (0...): " << cor << endl;
711 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
712 // hitForRec->Dump();}
713 // } // end of cluster loop
714 // } // end of chamber loop
718 //__________________________________________________________________________
719 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
721 // To add to the list of hits for reconstruction all the raw clusters
722 // No condition added, like in Fortran TRACKF_STAT,
723 // on the radius between RMin and RMax.
724 AliMUONHitForRec *hitForRec;
725 AliMUONRawCluster *clus;
726 Int_t iclus, nclus, nTRentries;
727 TClonesArray *rawclusters;
728 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
730 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
731 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
734 Error("MakeEventToBeReconstructed",
735 "Can not find Run Loader in Event Folder named %s.",
739 AliLoader* gime = rl->GetLoader("MUONLoader");
742 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
745 // Loading AliRun master
746 if (rl->GetAliRun() == 0x0) rl->LoadgAlice();
747 gAlice = rl->GetAliRun();
749 // Loading MUON subsystem
750 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
752 nTRentries = Int_t(TR->GetEntries());
753 if (nTRentries != 1) {
754 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
756 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
759 gime->TreeR()->GetEvent(0); // only one entry
760 // Loop over tracking chambers
761 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
762 // number of HitsForRec to 0 for the chamber
763 fNHitsForRecPerChamber[ch] = 0;
764 // index of first HitForRec for the chamber
765 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
766 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
767 rawclusters = pMUON->GetMUONData()->RawClusters(ch);
768 // pMUON->ResetRawClusters();
769 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
770 nclus = (Int_t) (rawclusters->GetEntries());
771 // Loop over (cathode correlated) raw clusters
772 for (iclus = 0; iclus < nclus; iclus++) {
773 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
774 // new AliMUONHitForRec from raw cluster
775 // and increment number of AliMUONHitForRec's (total and in chamber)
776 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
778 (fNHitsForRecPerChamber[ch])++;
779 // more information into HitForRec
780 // resolution: info should be already in raw cluster and taken from it ????
781 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
782 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
783 // original raw cluster
784 hitForRec->SetChamberNumber(ch);
785 hitForRec->SetHitNumber(iclus);
786 // Z coordinate of the raw cluster (cm)
787 hitForRec->SetZ(clus->fZ[0]);
788 if (fPrintLevel >= 10) {
789 cout << "chamber (0...): " << ch <<
790 " raw cluster (0...): " << iclus << endl;
792 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
794 } // end of cluster loop
795 } // end of chamber loop
796 SortHitsForRecWithIncreasingChamber(); //AZ
800 //__________________________________________________________________________
801 void AliMUONEventReconstructor::MakeSegments(void)
803 // To make the list of segments in all stations,
804 // from the list of hits to be reconstructed
805 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
807 // Loop over stations
808 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
809 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
810 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
811 MakeSegmentsPerStation(st);
812 if (fPrintLevel >= 10) {
813 cout << "end of MakeSegments" << endl;
814 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
815 cout << "station(0...): " << st
816 << " Segments: " << fNSegments[st]
819 seg < fNSegments[st];
821 cout << "Segment index(0...): " << seg << endl;
822 ((*fSegmentsPtr[st])[seg])->Dump();
829 //__________________________________________________________________________
830 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
832 // To make the list of segments in station number "Station" (0...)
833 // from the list of hits to be reconstructed.
834 // Updates "fNSegments"[Station].
835 // Segments in stations 4 and 5 are sorted
836 // according to increasing absolute value of "impact parameter"
837 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
838 AliMUONSegment *segment;
840 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
841 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
842 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
843 if (fPrintLevel >= 1)
844 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
845 // first and second chambers (0...) in the station
846 Int_t ch1 = 2 * Station;
848 // variable true for stations downstream of the dipole:
849 // Station(0..4) equal to 3 or 4
850 if ((Station == 3) || (Station == 4)) {
852 // maximum impact parameter (cm) according to fMinBendingMomentum...
854 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
855 // minimum impact parameter (cm) according to fMaxBendingMomentum...
857 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
859 else last2st = kFALSE;
860 // extrapolation factor from Z of first chamber to Z of second chamber
861 // dZ to be changed to take into account fine structure of chambers ????
862 Double_t extrapFact =
863 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
864 // index for current segment
865 Int_t segmentIndex = 0;
866 // Loop over HitsForRec in the first chamber of the station
867 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
868 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
870 // pointer to the HitForRec
871 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
873 // on the straight line joining the HitForRec to the vertex (0,0,0),
874 // to the Z of the second chamber of the station
875 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
876 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
877 // Loop over HitsForRec in the second chamber of the station
878 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
879 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
881 // pointer to the HitForRec
882 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
883 // absolute values of distances, in bending and non bending planes,
884 // between the HitForRec in the second chamber
885 // and the previous extrapolation
886 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
887 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
890 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
891 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
892 // absolute value of impact parameter
894 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
896 // check for distances not too large,
897 // and impact parameter not too big if stations downstream of the dipole.
898 // Conditions "distBend" and "impactParam" correlated for these stations ????
899 if ((distBend < fSegmentMaxDistBending[Station]) &&
900 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
901 (!last2st || (impactParam < maxImpactParam)) &&
902 (!last2st || (impactParam > minImpactParam))) {
904 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
905 AliMUONSegment(hit1Ptr, hit2Ptr);
906 // update "link" to this segment from the hit in the first chamber
907 if (hit1Ptr->GetNSegments() == 0)
908 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
909 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
910 if (fPrintLevel >= 10) {
911 cout << "segmentIndex(0...): " << segmentIndex
912 << " distBend: " << distBend
913 << " distNonBend: " << distNonBend
916 cout << "HitForRec in first chamber" << endl;
918 cout << "HitForRec in second chamber" << endl;
921 // increment index for current segment
925 } // for (Int_t hit1...
926 fNSegments[Station] = segmentIndex;
927 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
928 // i.e. Station(0..4) 3 or 4, using the function "Compare".
929 // After this sorting, it is impossible to use
930 // the "fNSegments" and "fIndexOfFirstSegment"
931 // of the HitForRec in the first chamber to explore all segments formed with it.
932 // Is this sorting really needed ????
933 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
934 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
935 << fNSegments[Station] << endl;
939 //__________________________________________________________________________
940 void AliMUONEventReconstructor::MakeTracks(void)
942 // To make the tracks,
943 // from the list of segments and points in all stations
944 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
945 // The order may be important for the following Reset's
948 if (fTrackMethod == 2) { //AZ - Kalman filter
949 MakeTrackCandidatesK();
950 // Follow tracks in stations(1..) 3, 2 and 1
952 // Remove double tracks
953 RemoveDoubleTracksK();
954 // Propagate tracks to the vertex thru absorber
957 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
958 MakeTrackCandidates();
959 // Follow tracks in stations(1..) 3, 2 and 1
961 // Remove double tracks
962 RemoveDoubleTracks();
967 //__________________________________________________________________________
968 void AliMUONEventReconstructor::MakeTriggerTracks(void)
970 // To make the trigger tracks from Local Trigger
971 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
972 ResetTriggerTracks();
975 TClonesArray *localTrigger;
976 TClonesArray *globalTrigger;
977 AliMUONLocalTrigger *locTrg;
978 AliMUONGlobalTrigger *gloTrg;
979 AliMUONTriggerCircuit *circuit;
980 AliMUONTriggerTrack *recTriggerTrack;
983 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
984 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
987 Error("MakeTriggerTracks",
988 "Can not find Run Loader in Event Folder named %s.",
992 AliLoader* gime = rl->GetLoader("MUONLoader");
995 Error("MakeTriggerTracks","Can not get MUON Loader from Run Loader.");
998 TTree* TR = gime->TreeR();
1000 // Loading AliRun master
1001 if (rl->GetAliRun() == 0x0) rl->LoadgAlice();
1002 gAlice = rl->GetAliRun();
1004 // Loading MUON subsystem
1005 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1007 nTRentries = Int_t(TR->GetEntries());
1008 if (nTRentries != 1) {
1009 cout << "Error in AliMUONEventReconstructor::MakeTriggerTracks"
1011 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
1014 gime->TreeR()->GetEvent(0); // only one entry
1016 pMUON->GetMUONData()->SetTreeAddress("GLT");
1017 pMUON->GetMUONData()->GetTrigger();
1021 globalTrigger = pMUON->GetMUONData()->GlobalTrigger();
1022 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1023 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1024 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1025 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1027 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1028 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1029 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1031 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1032 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1033 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1035 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1036 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1037 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1039 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1040 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1041 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1044 localTrigger = pMUON->GetMUONData()->LocalTrigger();
1045 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1046 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1047 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1049 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1050 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1051 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1052 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1053 Float_t y21 = circuit->GetY21Pos(locTrg->LoStripX());
1054 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1055 Float_t thetax = TMath::ATan2( x11 , z11 );
1056 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1058 recTriggerTrack = new ((*fRecTriggerTracksPtr)[fNRecTriggerTracks])
1059 AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1060 // since static statement does not work, set gloTrigPat for each track
1061 fNRecTriggerTracks++;
1062 } // end of loop on Local Trigger
1066 //__________________________________________________________________________
1067 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1069 // To make track candidates with two segments in stations(1..) 4 and 5,
1070 // the first segment being pointed to by "BegSegment".
1071 // Returns the number of such track candidates.
1072 Int_t endStation, iEndSegment, nbCan2Seg;
1073 AliMUONSegment *endSegment, *extrapSegment;
1074 AliMUONTrack *recTrack;
1076 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1077 // Station for the end segment
1078 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1079 // multiple scattering factor corresponding to one chamber
1080 mcsFactor = 0.0136 /
1081 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1082 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1083 // linear extrapolation to end station
1085 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
1086 // number of candidates with 2 segments to 0
1088 // Loop over segments in the end station
1089 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1090 // pointer to segment
1091 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1092 // test compatibility between current segment and "extrapSegment"
1093 // 4 because 4 quantities in chi2
1095 NormalizedChi2WithSegment(extrapSegment,
1096 fMaxSigma2Distance)) <= 4.0) {
1097 // both segments compatible:
1098 // make track candidate from "begSegment" and "endSegment"
1099 if (fPrintLevel >= 2)
1100 cout << "TrackCandidate with Segment " << iEndSegment <<
1101 " in Station(0..) " << endStation << endl;
1102 // flag for both segments in one track:
1103 // to be done in track constructor ????
1104 BegSegment->SetInTrack(kTRUE);
1105 endSegment->SetInTrack(kTRUE);
1106 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1107 AliMUONTrack(BegSegment, endSegment, this);
1109 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1110 // increment number of track candidates with 2 segments
1113 } // for (iEndSegment = 0;...
1114 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1118 //__________________________________________________________________________
1119 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1121 // To make track candidates with one segment and one point
1122 // in stations(1..) 4 and 5,
1123 // the segment being pointed to by "BegSegment".
1124 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1125 AliMUONHitForRec *extrapHitForRec, *hit;
1126 AliMUONTrack *recTrack;
1128 if (fPrintLevel >= 1)
1129 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1130 // station for the end point
1131 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1132 // multiple scattering factor corresponding to one chamber
1133 mcsFactor = 0.0136 /
1134 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1135 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1136 // first and second chambers(0..) in the end station
1137 ch1 = 2 * endStation;
1139 // number of candidates to 0
1141 // Loop over chambers of the end station
1142 for (ch = ch2; ch >= ch1; ch--) {
1143 // linear extrapolation to chamber
1145 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1146 // limits for the hit index in the loop
1147 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1148 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1149 // Loop over HitForRec's in the chamber
1150 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1151 // pointer to HitForRec
1152 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1153 // test compatibility between current HitForRec and "extrapHitForRec"
1154 // 2 because 2 quantities in chi2
1156 NormalizedChi2WithHitForRec(extrapHitForRec,
1157 fMaxSigma2Distance)) <= 2.0) {
1158 // both HitForRec's compatible:
1159 // make track candidate from begSegment and current HitForRec
1160 if (fPrintLevel >= 2)
1161 cout << "TrackCandidate with HitForRec " << iHit <<
1162 " in Chamber(0..) " << ch << endl;
1163 // flag for beginning segments in one track:
1164 // to be done in track constructor ????
1165 BegSegment->SetInTrack(kTRUE);
1166 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1167 AliMUONTrack(BegSegment, hit, this);
1168 // the right place to eliminate "double counting" ???? how ????
1170 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1171 // increment number of track candidates
1174 } // for (iHit = iHitMin;...
1175 delete extrapHitForRec;
1176 } // for (ch = ch2;...
1177 return nbCan1Seg1Hit;
1180 //__________________________________________________________________________
1181 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1183 // To make track candidates
1184 // with at least 3 aligned points in stations(1..) 4 and 5
1185 // (two Segment's or one Segment and one HitForRec)
1186 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1187 AliMUONSegment *begSegment;
1188 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1189 // Loop over stations(1..) 5 and 4 for the beginning segment
1190 for (begStation = 4; begStation > 2; begStation--) {
1191 // Loop over segments in the beginning station
1192 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1193 // pointer to segment
1194 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1195 if (fPrintLevel >= 2)
1196 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1197 " in Station(0..) " << begStation << endl;
1198 // Look for track candidates with two segments,
1199 // "begSegment" and all compatible segments in other station.
1200 // Only for beginning station(1..) 5
1201 // because candidates with 2 segments have to looked for only once.
1202 if (begStation == 4)
1203 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1204 // Look for track candidates with one segment and one point,
1205 // "begSegment" and all compatible HitForRec's in other station.
1206 // Only if "begSegment" does not belong already to a track candidate.
1207 // Is that a too strong condition ????
1208 if (!(begSegment->GetInTrack()))
1209 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1210 } // for (iBegSegment = 0;...
1211 } // for (begStation = 4;...
1215 //__________________________________________________________________________
1216 void AliMUONEventReconstructor::FollowTracks(void)
1218 // Follow tracks in stations(1..) 3, 2 and 1
1219 // too long: should be made more modular !!!!
1220 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1221 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1222 AliMUONTrack *track, *nextTrack;
1223 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1224 // -1 to avoid compilation warnings
1225 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1226 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1227 Double_t bendingMomentum, chi2Norm = 0.;
1228 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1229 // local maxSigma2Distance, for easy increase in testing
1230 maxSigma2Distance = fMaxSigma2Distance;
1231 if (fPrintLevel >= 2)
1232 cout << "enter FollowTracks" << endl;
1233 // Loop over track candidates
1234 track = (AliMUONTrack*) fRecTracksPtr->First();
1237 // Follow function for each track candidate ????
1239 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1240 if (fPrintLevel >= 2)
1241 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1242 // Fit track candidate
1243 track->SetFitMCS(0); // without multiple Coulomb scattering
1244 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1245 track->SetFitStart(0); // from parameters at vertex
1247 if (fPrintLevel >= 10) {
1248 cout << "FollowTracks: track candidate(0..): " << trackIndex
1249 << " after fit in stations(0..) 3 and 4" << endl;
1250 track->RecursiveDump();
1252 // Loop over stations(1..) 3, 2 and 1
1253 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1254 // otherwise: majority coincidence 2 !!!!
1255 for (station = 2; station >= 0; station--) {
1256 // Track parameters at first track hit (smallest Z)
1257 trackParam1 = ((AliMUONTrackHit*)
1258 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1259 // extrapolation to station
1260 trackParam1->ExtrapToStation(station, trackParam);
1261 extrapSegment = new AliMUONSegment(); // empty segment
1262 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1263 // multiple scattering factor corresponding to one chamber
1264 // and momentum in bending plane (not total)
1265 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1266 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1267 // Z difference from previous station
1268 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1269 (&(pMUON->Chamber(2 * station + 2)))->Z();
1270 // Z difference between the two previous stations
1271 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1272 (&(pMUON->Chamber(2 * station + 4)))->Z();
1273 // Z difference between the two chambers in the previous station
1274 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1275 (&(pMUON->Chamber(2 * station + 1)))->Z();
1276 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1278 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1279 extrapSegment->UpdateFromStationTrackParam
1280 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1281 trackParam1->GetInverseBendingMomentum());
1282 // same thing for corrected segment
1283 // better to use copy constructor, after checking that it works properly !!!!
1284 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1286 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1287 extrapCorrSegment->UpdateFromStationTrackParam
1288 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1289 trackParam1->GetInverseBendingMomentum());
1292 if (fPrintLevel >= 10) {
1293 cout << "FollowTracks: track candidate(0..): " << trackIndex
1294 << " Look for segment in station(0..): " << station << endl;
1296 // Loop over segments in station
1297 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1298 // Look for best compatible Segment in station
1299 // should consider all possibilities ????
1300 // multiple scattering ????
1301 // separation in 2 functions: Segment and HitForRec ????
1302 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1303 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1304 // according to real Z value of "segment" and slopes of "extrapSegment"
1306 SetBendingCoor(extrapSegment->GetBendingCoor() +
1307 extrapSegment->GetBendingSlope() *
1308 (segment->GetHitForRec1()->GetZ() -
1309 (&(pMUON->Chamber(2 * station)))->Z()));
1311 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1312 extrapSegment->GetNonBendingSlope() *
1313 (segment->GetHitForRec1()->GetZ() -
1314 (&(pMUON->Chamber(2 * station)))->Z()));
1316 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1317 if (chi2 < bestChi2) {
1318 // update best Chi2 and Segment if better found
1319 bestSegment = segment;
1324 // best segment found: add it to track candidate
1325 track->AddSegment(bestSegment);
1326 // set track parameters at these two TrakHit's
1327 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1328 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1329 if (fPrintLevel >= 10) {
1330 cout << "FollowTracks: track candidate(0..): " << trackIndex
1331 << " Added segment in station(0..): " << station << endl;
1332 track->RecursiveDump();
1336 // No best segment found:
1337 // Look for best compatible HitForRec in station:
1338 // should consider all possibilities ????
1339 // multiple scattering ???? do about like for extrapSegment !!!!
1340 extrapHit = new AliMUONHitForRec(); // empty hit
1341 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1344 if (fPrintLevel >= 10) {
1345 cout << "FollowTracks: track candidate(0..): " << trackIndex
1346 << " Segment not found, look for hit in station(0..): " << station
1349 // Loop over chambers of the station
1350 for (chInStation = 0; chInStation < 2; chInStation++) {
1351 // coordinates of extrapolated hit
1353 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1355 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1356 // resolutions from "extrapSegment"
1357 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1358 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1359 // same things for corrected hit
1360 // better to use copy constructor, after checking that it works properly !!!!
1362 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1364 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1365 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1366 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1367 // Loop over hits in the chamber
1368 ch = 2 * station + chInStation;
1369 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1370 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1371 fNHitsForRecPerChamber[ch];
1373 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1374 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1375 // according to real Z value of "hit" and slopes of right "trackParam"
1377 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1378 (&(trackParam[chInStation]))->GetBendingSlope() *
1380 (&(trackParam[chInStation]))->GetZ()));
1382 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1383 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1385 (&(trackParam[chInStation]))->GetZ()));
1386 // condition for hit not already in segment ????
1387 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1388 if (chi2 < bestChi2) {
1389 // update best Chi2 and HitForRec if better found
1392 chBestHit = chInStation;
1397 // best hit found: add it to track candidate
1398 track->AddHitForRec(bestHit);
1399 // set track parameters at this TrackHit
1400 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1401 &(trackParam[chBestHit]));
1402 if (fPrintLevel >= 10) {
1403 cout << "FollowTracks: track candidate(0..): " << trackIndex
1404 << " Added hit in station(0..): " << station << endl;
1405 track->RecursiveDump();
1409 // Remove current track candidate
1410 // and corresponding TrackHit's, ...
1412 delete extrapSegment;
1413 delete extrapCorrSegment;
1415 delete extrapCorrHit;
1416 break; // stop the search for this candidate:
1417 // exit from the loop over station
1420 delete extrapCorrHit;
1422 delete extrapSegment;
1423 delete extrapCorrSegment;
1424 // Sort track hits according to increasing Z
1425 track->GetTrackHitsPtr()->Sort();
1426 // Update track parameters at first track hit (smallest Z)
1427 trackParam1 = ((AliMUONTrackHit*)
1428 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1429 bendingMomentum = 0.;
1430 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1431 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1432 // Track removed if bendingMomentum not in window [min, max]
1433 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1435 break; // stop the search for this candidate:
1436 // exit from the loop over station
1439 // with multiple Coulomb scattering if all stations
1440 if (station == 0) track->SetFitMCS(1);
1441 // without multiple Coulomb scattering if not all stations
1442 else track->SetFitMCS(0);
1443 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1444 track->SetFitStart(1); // from parameters at first hit
1446 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1447 if (numberOfDegFree > 0) {
1448 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1452 // Track removed if normalized chi2 too high
1453 if (chi2Norm > fMaxChi2) {
1455 break; // stop the search for this candidate:
1456 // exit from the loop over station
1458 if (fPrintLevel >= 10) {
1459 cout << "FollowTracks: track candidate(0..): " << trackIndex
1460 << " after fit from station(0..): " << station << " to 4" << endl;
1461 track->RecursiveDump();
1463 // Track extrapolation to the vertex through the absorber (Branson)
1464 // after going through the first station
1466 trackParamVertex = *trackParam1;
1467 (&trackParamVertex)->ExtrapToVertex();
1468 track->SetTrackParamAtVertex(&trackParamVertex);
1469 if (fPrintLevel >= 1) {
1470 cout << "FollowTracks: track candidate(0..): " << trackIndex
1471 << " after extrapolation to vertex" << endl;
1472 track->RecursiveDump();
1475 } // for (station = 2;...
1476 // go really to next track
1479 // Compression of track array (necessary after Remove ????)
1480 fRecTracksPtr->Compress();
1484 //__________________________________________________________________________
1485 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1487 // To remove double tracks.
1488 // Tracks are considered identical
1489 // if they have at least half of their hits in common.
1490 // Among two identical tracks, one keeps the track with the larger number of hits
1491 // or, if these numbers are equal, the track with the minimum Chi2.
1492 AliMUONTrack *track1, *track2, *trackToRemove;
1493 Bool_t identicalTracks;
1494 Int_t hitsInCommon, nHits1, nHits2;
1495 identicalTracks = kTRUE;
1496 while (identicalTracks) {
1497 identicalTracks = kFALSE;
1498 // Loop over first track of the pair
1499 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1500 while (track1 && (!identicalTracks)) {
1501 nHits1 = track1->GetNTrackHits();
1502 // Loop over second track of the pair
1503 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1504 while (track2 && (!identicalTracks)) {
1505 nHits2 = track2->GetNTrackHits();
1506 // number of hits in common between two tracks
1507 hitsInCommon = track1->HitsInCommon(track2);
1508 // check for identical tracks
1509 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1510 identicalTracks = kTRUE;
1511 // decide which track to remove
1512 if (nHits1 > nHits2) trackToRemove = track2;
1513 else if (nHits1 < nHits2) trackToRemove = track1;
1514 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1515 trackToRemove = track2;
1516 else trackToRemove = track1;
1518 trackToRemove->Remove();
1520 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1522 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1528 //__________________________________________________________________________
1529 void AliMUONEventReconstructor::EventDump(void)
1531 // Dump reconstructed event (track parameters at vertex and at first hit),
1532 // and the particle parameters
1534 AliMUONTrack *track;
1535 AliMUONTrackParam *trackParam, *trackParam1;
1536 Double_t bendingSlope, nonBendingSlope, pYZ;
1537 Double_t pX, pY, pZ, x, y, z, c;
1538 Int_t np, trackIndex, nTrackHits;
1540 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1541 if (fPrintLevel >= 1) {
1542 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1544 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1545 // Loop over reconstructed tracks
1546 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1547 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1548 if (fPrintLevel >= 1)
1549 cout << " track number: " << trackIndex << endl;
1550 // function for each track for modularity ????
1551 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1552 nTrackHits = track->GetNTrackHits();
1553 if (fPrintLevel >= 1)
1554 cout << " number of track hits: " << nTrackHits << endl;
1555 // track parameters at Vertex
1556 trackParam = track->GetTrackParamAtVertex();
1557 x = trackParam->GetNonBendingCoor();
1558 y = trackParam->GetBendingCoor();
1559 z = trackParam->GetZ();
1560 bendingSlope = trackParam->GetBendingSlope();
1561 nonBendingSlope = trackParam->GetNonBendingSlope();
1562 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1563 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1564 pX = pZ * nonBendingSlope;
1565 pY = pZ * bendingSlope;
1566 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1567 if (fPrintLevel >= 1)
1568 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1569 z, x, y, pX, pY, pZ, c);
1571 // track parameters at first hit
1572 trackParam1 = ((AliMUONTrackHit*)
1573 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1574 x = trackParam1->GetNonBendingCoor();
1575 y = trackParam1->GetBendingCoor();
1576 z = trackParam1->GetZ();
1577 bendingSlope = trackParam1->GetBendingSlope();
1578 nonBendingSlope = trackParam1->GetNonBendingSlope();
1579 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1580 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1581 pX = pZ * nonBendingSlope;
1582 pY = pZ * bendingSlope;
1583 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1584 if (fPrintLevel >= 1)
1585 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1586 z, x, y, pX, pY, pZ, c);
1588 // informations about generated particles
1589 np = gAlice->GetMCApp()->GetNtrack();
1590 printf(" **** number of generated particles: %d \n", np);
1592 // for (Int_t iPart = 0; iPart < np; iPart++) {
1593 // p = gAlice->Particle(iPart);
1594 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1595 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1601 //__________________________________________________________________________
1602 void AliMUONEventReconstructor::EventDumpTrigger(void)
1604 // Dump reconstructed trigger event
1605 // and the particle parameters
1607 AliMUONTriggerTrack *triggertrack;
1610 if (fPrintLevel >= 1) cout << "****** enter EventDumpTrigger ******" << endl;
1611 if (fPrintLevel >= 1) {
1612 cout << " Number of Reconstructed tracks :" << fNRecTriggerTracks << endl;
1614 // Loop over reconstructed tracks
1615 for (trackIndex = 0; trackIndex < fNRecTriggerTracks; trackIndex++) {
1616 triggertrack = (AliMUONTriggerTrack*) ((*fRecTriggerTracksPtr)[trackIndex]);
1617 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1619 triggertrack->GetX11(),triggertrack->GetY11(),
1620 triggertrack->GetThetax(),triggertrack->GetThetay());
1624 //__________________________________________________________________________
1625 void AliMUONEventReconstructor::FillEvent()
1627 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1628 // leaf in the Event branch of TreeRecoEvent tree
1629 cout << "Enter FillEvent() ...\n";
1632 fRecoEvent = new AliMUONRecoEvent();
1634 fRecoEvent->Clear();
1636 //save current directory
1637 TDirectory *current = gDirectory;
1638 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1639 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1640 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1641 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1642 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1643 TBranch *branch = fEventTree->GetBranch("Event");
1644 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1645 branch->SetAutoDelete();
1650 // restore directory
1654 //__________________________________________________________________________
1655 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1657 // To make initial tracks for Kalman filter from the list of segments
1659 AliMUONSegment *segment;
1660 AliMUONTrackK *trackK;
1662 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1663 // Reset the TClonesArray of reconstructed tracks
1664 if (fRecTracksPtr) fRecTracksPtr->Delete();
1665 // Delete in order that the Track destructors are called,
1666 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1669 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1670 // Loop over stations(1...) 5 and 4
1671 for (istat=4; istat>=3; istat--) {
1672 // Loop over segments in the station
1673 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1674 // Transform segments to tracks and evaluate covariance matrix
1675 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1676 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1678 } // for (iseg=0;...)
1679 } // for (istat=4;...)
1683 //__________________________________________________________________________
1684 void AliMUONEventReconstructor::FollowTracksK(void)
1686 // Follow tracks using Kalman filter
1688 Int_t icand, ichamBeg, ichamEnd, chamBits;
1689 Double_t zDipole1, zDipole2;
1690 AliMUONTrackK *trackK;
1691 AliMUONHitForRec *hit;
1692 AliMUONRawCluster *clus;
1693 TClonesArray *rawclusters;
1695 clus = 0; rawclusters = 0;
1697 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1698 zDipole2 = zDipole1 + GetSimpleBLength();
1701 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1702 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1703 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1704 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1706 cout << " Hit #" << hit->GetChamberNumber() << " ";
1707 cout << hit->GetBendingCoor() << " ";
1708 cout << hit->GetNonBendingCoor() << " ";
1709 cout << hit->GetZ() << " ";
1710 cout << hit->GetGeantSignal() << " ";
1711 cout << hit->GetTHTrack() << endl;
1714 printf(" Hit # %d %10.4f %10.4f %10.4f",
1715 hit->GetChamberNumber(), hit->GetBendingCoor(),
1716 hit->GetNonBendingCoor(), hit->GetZ());
1717 if (fRecGeantHits) {
1719 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1721 // from raw clusters
1722 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1723 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1725 printf("%3d", clus->fTracks[1]-1);
1726 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1733 Int_t nSeeds = fNRecTracks; // starting number of seeds
1734 // Loop over track candidates
1735 while (icand < fNRecTracks-1) {
1737 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1739 // Discard candidate which will produce the double track
1741 Ok = CheckCandidateK(icand,nSeeds);
1743 //trackK->SetRecover(-1); // mark candidate to be removed
1749 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1750 trackK->GetHitOnTrack()->Last(); // last hit
1751 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1752 ichamBeg = hit->GetChamberNumber();
1754 // Check propagation direction
1755 if (trackK->GetTrackDir() > 0) {
1756 ichamEnd = 9; // forward propagation
1757 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1759 ichamBeg = ichamEnd;
1760 ichamEnd = 6; // backward propagation
1761 // Change weight matrix and zero fChi2 for backpropagation
1762 trackK->StartBack();
1763 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1764 ichamBeg = ichamEnd;
1768 if (trackK->GetBPFlag()) {
1770 ichamEnd = 6; // backward propagation
1771 // Change weight matrix and zero fChi2 for backpropagation
1772 trackK->StartBack();
1773 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1774 ichamBeg = ichamEnd;
1780 trackK->SetTrackDir(-1);
1781 trackK->SetBPFlag(kFALSE);
1782 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1784 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1785 else trackK->SetRecover(-1); // mark candidate to be removed
1787 // Majority 3 of 4 in first 2 stations
1789 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1790 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1791 chamBits |= BIT(hit->GetChamberNumber()-1);
1793 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1794 //mark candidate to be removed
1797 for (Int_t i=0; i<fNRecTracks; i++) {
1798 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1799 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1802 // Compress TClonesArray
1803 fRecTracksPtr->Compress();
1804 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1808 //__________________________________________________________________________
1809 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1811 // Discards track candidate if it will produce the double track (having
1812 // the same seed segment hits as hits of a good track found before)
1813 AliMUONTrackK *track1, *track2;
1814 AliMUONHitForRec *hit1, *hit2, *hit;
1816 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1817 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1818 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1820 for (Int_t i=0; i<icand; i++) {
1821 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1822 //if (track2->GetRecover() < 0) continue;
1823 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1825 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1829 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1830 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1831 if (hit == hit1 || hit == hit2) {
1833 if (nSame == 2) return kFALSE;
1835 } // for (Int_t j=0;
1837 } // for (Int_t i=0;
1841 //__________________________________________________________________________
1842 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1844 // Removes double tracks (sharing more than half of their hits). Keeps
1845 // the track with higher quality
1846 AliMUONTrackK *track1, *track2, *trackToKill;
1848 // Sort tracks according to their quality
1849 fRecTracksPtr->Sort();
1851 // Loop over first track of the pair
1852 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1854 // Loop over second track of the pair
1855 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1857 // Check whether or not to keep track2
1858 if (!track2->KeepTrack(track1)) {
1859 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1860 " " << track2->GetTrackQuality() << endl;
1861 trackToKill = track2;
1862 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1863 trackToKill->Kill();
1864 fRecTracksPtr->Compress();
1865 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1867 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1870 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1871 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1874 //__________________________________________________________________________
1875 void AliMUONEventReconstructor::GoToVertex(void)
1877 // Propagates track to the vertex thru absorber
1878 // (using Branson correction for now)
1882 for (Int_t i=0; i<fNRecTracks; i++) {
1883 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1884 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1885 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1886 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber