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 "AliMUONLocalTrigger.h"
49 #include "AliMUONGlobalTrigger.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(AliLoader* loader)
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
144 // initialize loader's
147 // initialize container
148 fMUONData = new AliMUONData(fLoader,"MUON","MUON");
150 // Loading AliRun master
151 AliRunLoader* runloader = fLoader->GetRunLoader();
152 if (runloader->GetAliRun() == 0x0) runloader->LoadgAlice();
153 gAlice = runloader->GetAliRun();
157 //__________________________________________________________________________
158 AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
160 // Dummy copy constructor
163 AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
165 // Dummy assignment operator
169 //__________________________________________________________________________
170 AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
172 // Destructor for class AliMUONEventReconstructor
177 // if (fEventTree) delete fEventTree;
178 if (fRecoEvent) delete fRecoEvent;
179 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
180 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
181 delete fSegmentsPtr[st]; // Correct destruction of everything ????
185 //__________________________________________________________________________
186 void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
188 // Set reconstruction parameters to default values
189 // Would be much more convenient with a structure (or class) ????
190 fMinBendingMomentum = kDefaultMinBendingMomentum;
191 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
192 fMaxChi2 = kDefaultMaxChi2;
193 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
195 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
196 // ******** Parameters for making HitsForRec
198 // like in TRACKF_STAT:
199 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
200 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
201 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
202 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
203 2.0 * TMath::Pi() / 180.0;
204 else fRMin[ch] = 30.0;
205 // maximum radius at 10 degrees and Z of chamber
206 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
207 10.0 * TMath::Pi() / 180.0;
210 // ******** Parameters for making segments
211 // should be parametrized ????
212 // according to interval between chambers in a station ????
213 // Maximum distance in non bending plane
214 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
216 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
217 fSegmentMaxDistNonBending[st] = 5. * 0.22;
218 // Maximum distance in bending plane:
219 // values from TRACKF_STAT, corresponding to (J psi 20cm),
220 // scaled to the real distance between chambers in a station
221 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
222 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
223 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
224 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
225 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
226 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
227 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
228 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
229 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
230 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
232 fBendingResolution = kDefaultBendingResolution;
233 fNonBendingResolution = kDefaultNonBendingResolution;
234 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
235 fSimpleBValue = kDefaultSimpleBValue;
236 fSimpleBLength = kDefaultSimpleBLength;
237 fSimpleBPosition = kDefaultSimpleBPosition;
238 fRecGeantHits = kDefaultRecGeantHits;
239 fEfficiency = kDefaultEfficiency;
240 fPrintLevel = kDefaultPrintLevel;
244 //__________________________________________________________________________
245 Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
247 // Returns impact parameter at vertex in bending plane (cm),
248 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
249 // using simple values for dipole magnetic field.
250 // The sign of "BendingMomentum" is the sign of the charge.
251 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
255 //__________________________________________________________________________
256 Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
258 // Returns signed bending momentum in bending plane (GeV/c),
259 // the sign being the sign of the charge for particles moving forward in Z,
260 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
261 // using simple values for dipole magnetic field.
262 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
266 //__________________________________________________________________________
267 void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
269 // Set background file ... for GEANT hits
270 // Must be called after having loaded the firts signal event
271 if (fPrintLevel >= 0) {
272 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
273 << BkgGeantFileName << "''" << endl;}
274 if (strlen(BkgGeantFileName)) {
275 // BkgGeantFileName not empty: try to open the file
276 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
277 fBkgGeantFile = new TFile(BkgGeantFileName);
278 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
279 if (fBkgGeantFile-> IsOpen()) {
280 if (fPrintLevel >= 0) {
281 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
282 << "'' successfully opened" << endl;}
285 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
286 cout << "NOT FOUND: EXIT" << endl;
287 exit(0); // right instruction for exit ????
289 // Arrays for "particles" and "hits"
290 fBkgGeantParticles = new TClonesArray("TParticle", 200);
291 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
292 // Event number to -1 for initialization
293 fBkgGeantEventNumber = -1;
294 // Back to the signal file:
295 // first signal event must have been loaded previously,
296 // otherwise, Segmentation violation at the next instruction
297 // How is it possible to do smething better ????
298 ((gAlice->TreeK())->GetCurrentFile())->cd();
299 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
304 //__________________________________________________________________________
305 void AliMUONEventReconstructor::NextBkgGeantEvent(void)
307 // Get next event in background file for GEANT hits
308 // Goes back to event number 0 when end of file is reached
311 if (fPrintLevel >= 0) {
312 cout << "Enter NextBkgGeantEvent" << endl;}
313 // Clean previous event
314 if(fBkgGeantTK) delete fBkgGeantTK;
316 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
317 if(fBkgGeantTH) delete fBkgGeantTH;
319 if(fBkgGeantHits) fBkgGeantHits->Clear();
320 // Increment event number
321 fBkgGeantEventNumber++;
322 // Get access to Particles and Hits for event from background file
323 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
325 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
326 // Particles: TreeK for event and branch "Particles"
327 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
328 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
330 if (fPrintLevel >= 0) {
331 cout << "Cannot find Kine Tree for background event: " <<
332 fBkgGeantEventNumber << endl;
333 cout << "Goes back to event 0" << endl;
335 fBkgGeantEventNumber = 0;
336 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
337 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
339 cout << "ERROR: cannot find Kine Tree for background event: " <<
340 fBkgGeantEventNumber << endl;
345 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
346 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
347 // Hits: TreeH for event and branch "MUON"
348 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
349 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
351 cout << "ERROR: cannot find Hits Tree for background event: " <<
352 fBkgGeantEventNumber << endl;
355 if (fBkgGeantTH && fBkgGeantHits) {
356 branch = fBkgGeantTH->GetBranch("MUON");
357 if (branch) branch->SetAddress(&fBkgGeantHits);
359 fBkgGeantTH->GetEntries(); // necessary ????
360 // Back to the signal file
361 ((gAlice->TreeK())->GetCurrentFile())->cd();
362 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
366 //__________________________________________________________________________
367 void AliMUONEventReconstructor::EventReconstruct(void)
369 // To reconstruct one event
370 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
371 MakeEventToBeReconstructed();
377 //__________________________________________________________________________
378 void AliMUONEventReconstructor::EventReconstructTrigger(void)
380 // To reconstruct one event
381 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
386 //__________________________________________________________________________
387 void AliMUONEventReconstructor::ResetHitsForRec(void)
389 // To reset the array and the number of HitsForRec,
390 // and also the number of HitsForRec
391 // and the index of the first HitForRec per chamber
392 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
394 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
395 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
399 //__________________________________________________________________________
400 void AliMUONEventReconstructor::ResetSegments(void)
402 // To reset the TClonesArray of segments and the number of Segments
404 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
405 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
411 //__________________________________________________________________________
412 void AliMUONEventReconstructor::ResetTracks(void)
414 // To reset the TClonesArray of reconstructed tracks
415 if (fRecTracksPtr) fRecTracksPtr->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
422 //__________________________________________________________________________
423 void AliMUONEventReconstructor::ResetTriggerTracks(void)
425 // To reset the TClonesArray of reconstructed trigger tracks
426 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
427 // Delete in order that the Track destructors are called,
428 // hence the space for the TClonesArray of pointers to TrackHit's is freed
429 fNRecTriggerTracks = 0;
433 //__________________________________________________________________________
434 void AliMUONEventReconstructor::ResetTrackHits(void)
436 // To reset the TClonesArray of hits on reconstructed tracks
437 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
442 //__________________________________________________________________________
443 void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
445 // To make the list of hits to be reconstructed,
446 // either from the GEANT hits or from the raw clusters
447 // according to the parameter set for the reconstructor
448 // TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
450 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
453 // Error("MakeEventToBeReconstructed",
454 // "Can not find Run Loader in Event Folder named %s.",
455 // evfoldname.Data());
458 // AliLoader* gime = rl->GetLoader("MUONLoader");
461 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
465 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
467 if (fRecGeantHits == 1) {
468 // Reconstruction from GEANT hits
469 // Back to the signal file
470 TTree* treeH = fLoader->TreeH();
473 Int_t retval = fLoader->LoadHits();
476 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
479 treeH = fLoader->TreeH();
482 Error("MakeEventToBeReconstructed","Can not get TreeH");
486 fMUONData->SetTreeAddress("H");
487 AddHitsForRecFromGEANT(treeH);
490 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
491 // Sort HitsForRec in increasing order with respect to chamber number
492 SortHitsForRecWithIncreasingChamber();
495 // Reconstruction from raw clusters
496 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
497 // Security on MUON ????
498 // TreeR assumed to be be "prepared" in calling function
499 // by "MUON->GetTreeR(nev)" ????
500 TTree *treeR = fLoader->TreeR();
501 fMUONData->SetTreeAddress("RC");
502 AddHitsForRecFromRawClusters(treeR);
503 // No sorting: it is done automatically in the previous function
505 if (fPrintLevel >= 10) {
506 cout << "end of MakeEventToBeReconstructed" << endl;
507 cout << "NHitsForRec: " << fNHitsForRec << endl;
508 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
509 cout << "chamber(0...): " << ch
510 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
511 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
513 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
514 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
516 cout << "HitForRec index(0...): " << hit << endl;
517 ((*fHitsForRecPtr)[hit])->Dump();
524 //__________________________________________________________________________
525 void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
527 // To add to the list of hits for reconstruction
528 // the GEANT signal hits from a hit tree TH.
529 Int_t hitBits, chamBits; //AZ
530 if (fPrintLevel >= 2)
531 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
532 if (TH == NULL) return;
533 // AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
534 //AliMUONData * muondata = pMUON->GetMUONData();
535 // Security on MUON ????
536 // See whether it could be the same for signal and background ????
537 // Loop over tracks in tree
538 Int_t ntracks = (Int_t) TH->GetEntries();
539 if (fPrintLevel >= 2)
540 cout << "ntracks: " << ntracks << endl;
542 for (Int_t track = 0; track < ntracks; track++) {
543 fMUONData->ResetHits();
549 Int_t itrack = track; //AZ
552 nhits = (Int_t) fMUONData->Hits()->GetEntriesFast();
553 AliMUONHit* mHit=0x0;
555 for(ihit=0; ihit<nhits; ihit++) {
556 mHit = static_cast<AliMUONHit*>(fMUONData->Hits()->At(ihit));
557 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
558 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
559 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
560 && itrack <= 2 && !BIT(mHit->Chamber()-1) ) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
563 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
564 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
566 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
567 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
568 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
569 } // end of track loop
573 //__________________________________________________________________________
574 void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
576 // To add to the list of hits for reconstruction
577 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
578 // How to have only one function "AddHitsForRecFromGEANT" ????
579 if (fPrintLevel >= 2)
580 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
581 if (TH == NULL) return;
582 // Loop over tracks in tree
583 Int_t ntracks = (Int_t) TH->GetEntries();
584 if (fPrintLevel >= 2)
585 cout << "ntracks: " << ntracks << endl;
586 for (Int_t track = 0; track < ntracks; track++) {
587 if (Hits) Hits->Clear();
590 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
591 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
593 } // end of track loop
597 //__________________________________________________________________________
598 AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
600 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
601 // with hit number "HitNumber" in the track numbered "TrackNumber",
602 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
603 // Selects hits in tracking (not trigger) chambers.
604 // Takes into account the efficiency (fEfficiency)
605 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
606 // Adds a condition on the radius between RMin and RMax
607 // to better simulate the real chambers.
608 // Returns the pointer to the new hit for reconstruction,
609 // or NULL in case of inefficiency or non tracking chamber or bad radius.
610 // No condition on at most 20 cm from a muon from a resonance
611 // like in Fortran TRACKF_STAT.
612 AliMUONHitForRec* hitForRec;
613 Double_t bendCoor, nonBendCoor, radius;
614 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
615 // only in tracking chambers (fChamber starts at 1)
616 if (chamber >= kMaxMuonTrackingChambers) return NULL;
617 // only if hit is efficient (keep track for checking ????)
618 if (gRandom->Rndm() > fEfficiency) return NULL;
619 // only if radius between RMin and RMax
621 nonBendCoor = Hit->X();
622 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
623 // This cut is not needed with a realistic chamber geometry !!!!
624 // if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
625 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
626 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
628 // add smearing from resolution
629 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
630 hitForRec->SetNonBendingCoor(nonBendCoor
631 + gRandom->Gaus(0., fNonBendingResolution));
632 // // !!!! without smearing
633 // hitForRec->SetBendingCoor(bendCoor);
634 // hitForRec->SetNonBendingCoor(nonBendCoor);
635 // more information into HitForRec
636 // resolution: angular effect to be added here ????
637 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
638 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
640 hitForRec->SetHitNumber(HitNumber);
641 hitForRec->SetTHTrack(TrackNumber);
642 hitForRec->SetGeantSignal(Signal);
643 if (fPrintLevel >= 10) {
644 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
646 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
651 //__________________________________________________________________________
652 void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
654 // Sort HitsForRec's in increasing order with respect to chamber number.
655 // Uses the function "Compare".
656 // Update the information for HitsForRec per chamber too.
657 Int_t ch, nhits, prevch;
658 fHitsForRecPtr->Sort();
659 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
660 fNHitsForRecPerChamber[ch] = 0;
661 fIndexOfFirstHitForRecPerChamber[ch] = 0;
663 prevch = 0; // previous chamber
664 nhits = 0; // number of hits in current chamber
665 // Loop over HitsForRec
666 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
667 // chamber number (0...)
668 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
669 // increment number of hits in current chamber
670 (fNHitsForRecPerChamber[ch])++;
671 // update index of first HitForRec in current chamber
672 // if chamber number different from previous one
674 fIndexOfFirstHitForRecPerChamber[ch] = hit;
681 // //__________________________________________________________________________
682 // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
684 // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
685 // // To add to the list of hits for reconstruction
686 // // the (cathode correlated) raw clusters
687 // // No condition added, like in Fortran TRACKF_STAT,
688 // // on the radius between RMin and RMax.
689 // AliMUONHitForRec *hitForRec;
690 // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
691 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
692 // // Security on MUON ????
693 // // Loop over tracking chambers
694 // for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
695 // // number of HitsForRec to 0 for the chamber
696 // fNHitsForRecPerChamber[ch] = 0;
697 // // index of first HitForRec for the chamber
698 // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
699 // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
700 // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
701 // MUON->ResetReconstHits();
703 // Int_t ncor = (Int_t)reconst_hits->GetEntries();
704 // // Loop over (cathode correlated) raw clusters
705 // for (Int_t cor = 0; cor < ncor; cor++) {
706 // AliMUONReconstHit * mCor =
707 // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
708 // // new AliMUONHitForRec from (cathode correlated) raw cluster
709 // // and increment number of AliMUONHitForRec's (total and in chamber)
710 // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
712 // (fNHitsForRecPerChamber[ch])++;
713 // // more information into HitForRec
714 // hitForRec->SetChamberNumber(ch);
715 // hitForRec->SetHitNumber(cor);
716 // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
717 // // could (should) be more exact from chamber geometry ????
718 // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
719 // if (fPrintLevel >= 10) {
720 // cout << "chamber (0...): " << ch <<
721 // " cathcorrel (0...): " << cor << endl;
723 // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
724 // hitForRec->Dump();}
725 // } // end of cluster loop
726 // } // end of chamber loop
730 //__________________________________________________________________________
731 void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
733 // To add to the list of hits for reconstruction all the raw clusters
734 // No condition added, like in Fortran TRACKF_STAT,
735 // on the radius between RMin and RMax.
736 AliMUONHitForRec *hitForRec;
737 AliMUONRawCluster *clus;
738 Int_t iclus, nclus, nTRentries;
739 TClonesArray *rawclusters;
740 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
742 // TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
743 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
746 // Error("MakeEventToBeReconstructed",
747 // "Can not find Run Loader in Event Folder named %s.",
748 // evfoldname.Data());
751 // AliLoader* gime = rl->GetLoader("MUONLoader");
754 // Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
757 // // Loading AliRun master
759 // gAlice = rl->GetAliRun();
761 // Loading MUON subsystem
762 // AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
764 nTRentries = Int_t(TR->GetEntries());
765 if (nTRentries != 1) {
766 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
768 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
771 fLoader->TreeR()->GetEvent(0); // only one entry
773 // Loop over tracking chambers
774 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
775 // number of HitsForRec to 0 for the chamber
776 fNHitsForRecPerChamber[ch] = 0;
777 // index of first HitForRec for the chamber
778 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
779 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
780 rawclusters =fMUONData->RawClusters(ch);
781 // pMUON->ResetRawClusters();
782 // TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
783 nclus = (Int_t) (rawclusters->GetEntries());
784 // Loop over (cathode correlated) raw clusters
785 for (iclus = 0; iclus < nclus; iclus++) {
786 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
787 // new AliMUONHitForRec from raw cluster
788 // and increment number of AliMUONHitForRec's (total and in chamber)
789 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
791 (fNHitsForRecPerChamber[ch])++;
792 // more information into HitForRec
793 // resolution: info should be already in raw cluster and taken from it ????
794 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
795 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
796 // original raw cluster
797 hitForRec->SetChamberNumber(ch);
798 hitForRec->SetHitNumber(iclus);
799 // Z coordinate of the raw cluster (cm)
800 hitForRec->SetZ(clus->fZ[0]);
801 if (fPrintLevel >= 10) {
802 cout << "chamber (0...): " << ch <<
803 " raw cluster (0...): " << iclus << endl;
805 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
807 } // end of cluster loop
808 } // end of chamber loop
809 SortHitsForRecWithIncreasingChamber(); //AZ
813 //__________________________________________________________________________
814 void AliMUONEventReconstructor::MakeSegments(void)
816 // To make the list of segments in all stations,
817 // from the list of hits to be reconstructed
818 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
820 // Loop over stations
821 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
822 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
823 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
824 MakeSegmentsPerStation(st);
825 if (fPrintLevel >= 10) {
826 cout << "end of MakeSegments" << endl;
827 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
828 cout << "station(0...): " << st
829 << " Segments: " << fNSegments[st]
832 seg < fNSegments[st];
834 cout << "Segment index(0...): " << seg << endl;
835 ((*fSegmentsPtr[st])[seg])->Dump();
842 //__________________________________________________________________________
843 void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
845 // To make the list of segments in station number "Station" (0...)
846 // from the list of hits to be reconstructed.
847 // Updates "fNSegments"[Station].
848 // Segments in stations 4 and 5 are sorted
849 // according to increasing absolute value of "impact parameter"
850 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
851 AliMUONSegment *segment;
853 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
854 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
855 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
856 if (fPrintLevel >= 1)
857 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
858 // first and second chambers (0...) in the station
859 Int_t ch1 = 2 * Station;
861 // variable true for stations downstream of the dipole:
862 // Station(0..4) equal to 3 or 4
863 if ((Station == 3) || (Station == 4)) {
865 // maximum impact parameter (cm) according to fMinBendingMomentum...
867 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
868 // minimum impact parameter (cm) according to fMaxBendingMomentum...
870 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
872 else last2st = kFALSE;
873 // extrapolation factor from Z of first chamber to Z of second chamber
874 // dZ to be changed to take into account fine structure of chambers ????
875 Double_t extrapFact =
876 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
877 // index for current segment
878 Int_t segmentIndex = 0;
879 // Loop over HitsForRec in the first chamber of the station
880 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
881 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
883 // pointer to the HitForRec
884 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
886 // on the straight line joining the HitForRec to the vertex (0,0,0),
887 // to the Z of the second chamber of the station
888 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
889 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
890 // Loop over HitsForRec in the second chamber of the station
891 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
892 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
894 // pointer to the HitForRec
895 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
896 // absolute values of distances, in bending and non bending planes,
897 // between the HitForRec in the second chamber
898 // and the previous extrapolation
899 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
900 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
903 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
904 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
905 // absolute value of impact parameter
907 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
909 // check for distances not too large,
910 // and impact parameter not too big if stations downstream of the dipole.
911 // Conditions "distBend" and "impactParam" correlated for these stations ????
912 if ((distBend < fSegmentMaxDistBending[Station]) &&
913 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
914 (!last2st || (impactParam < maxImpactParam)) &&
915 (!last2st || (impactParam > minImpactParam))) {
917 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
918 AliMUONSegment(hit1Ptr, hit2Ptr);
919 // update "link" to this segment from the hit in the first chamber
920 if (hit1Ptr->GetNSegments() == 0)
921 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
922 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
923 if (fPrintLevel >= 10) {
924 cout << "segmentIndex(0...): " << segmentIndex
925 << " distBend: " << distBend
926 << " distNonBend: " << distNonBend
929 cout << "HitForRec in first chamber" << endl;
931 cout << "HitForRec in second chamber" << endl;
934 // increment index for current segment
938 } // for (Int_t hit1...
939 fNSegments[Station] = segmentIndex;
940 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
941 // i.e. Station(0..4) 3 or 4, using the function "Compare".
942 // After this sorting, it is impossible to use
943 // the "fNSegments" and "fIndexOfFirstSegment"
944 // of the HitForRec in the first chamber to explore all segments formed with it.
945 // Is this sorting really needed ????
946 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
947 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
948 << fNSegments[Station] << endl;
952 //__________________________________________________________________________
953 void AliMUONEventReconstructor::MakeTracks(void)
955 // To make the tracks,
956 // from the list of segments and points in all stations
957 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
958 // The order may be important for the following Reset's
961 if (fTrackMethod == 2) { //AZ - Kalman filter
962 MakeTrackCandidatesK();
963 // Follow tracks in stations(1..) 3, 2 and 1
965 // Remove double tracks
966 RemoveDoubleTracksK();
967 // Propagate tracks to the vertex thru absorber
970 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
971 MakeTrackCandidates();
972 // Follow tracks in stations(1..) 3, 2 and 1
974 // Remove double tracks
975 RemoveDoubleTracks();
977 // AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
978 for(Int_t i=0; i<GetNRecTracks(); i++) {
979 AliMUONTrack * track = (AliMUONTrack*) GetRecTracksPtr()->At(i);
980 fMUONData->AddRecTrack(*track);
985 //__________________________________________________________________________
986 void AliMUONEventReconstructor::MakeTriggerTracks(void)
988 // To make the trigger tracks from Local Trigger
989 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
990 // ResetTriggerTracks();
994 TClonesArray *localTrigger;
995 TClonesArray *globalTrigger;
996 AliMUONLocalTrigger *locTrg;
997 AliMUONGlobalTrigger *gloTrg;
998 AliMUONTriggerCircuit *circuit;
999 AliMUONTriggerTrack *recTriggerTrack = 0;
1000 // TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
1001 // AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
1004 // Error("MakeTriggerTracks",
1005 // "Can not find Run Loader in Event Folder named %s.",
1006 // evfoldname.Data());
1009 // AliLoader* gime = rl->GetLoader("MUONLoader");
1012 // Error("MakeTriggerTracks","Can not get MUON Loader from Run Loader.");
1015 TTree* TR = fLoader->TreeR();
1017 // Loading AliRun master
1018 // rl->LoadgAlice();
1019 // gAlice = rl->GetAliRun();
1021 // Loading MUON subsystem
1022 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1024 nTRentries = Int_t(TR->GetEntries());
1025 if (nTRentries != 1) {
1026 cout << "Error in AliMUONEventReconstructor::MakeTriggerTracks"
1028 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
1031 fLoader->TreeR()->GetEvent(0); // only one entry
1033 fMUONData->SetTreeAddress("GLT");
1034 fMUONData->GetTrigger();
1036 // global trigger for trigger pattern
1038 globalTrigger = fMUONData->GlobalTrigger();
1039 gloTrg = (AliMUONGlobalTrigger*)globalTrigger->UncheckedAt(0);
1040 if (gloTrg->SinglePlusLpt()) gloTrigPat|= 0x1;
1041 if (gloTrg->SinglePlusHpt()) gloTrigPat|= 0x2;
1042 if (gloTrg->SinglePlusApt()) gloTrigPat|= 0x4;
1044 if (gloTrg->SingleMinusLpt()) gloTrigPat|= 0x8;
1045 if (gloTrg->SingleMinusHpt()) gloTrigPat|= 0x10;
1046 if (gloTrg->SingleMinusApt()) gloTrigPat|= 0x20;
1048 if (gloTrg->SingleUndefLpt()) gloTrigPat|= 0x40;
1049 if (gloTrg->SingleUndefHpt()) gloTrigPat|= 0x80;
1050 if (gloTrg->SingleUndefApt()) gloTrigPat|= 0x100;
1052 if (gloTrg->PairUnlikeLpt()) gloTrigPat|= 0x200;
1053 if (gloTrg->PairUnlikeHpt()) gloTrigPat|= 0x400;
1054 if (gloTrg->PairUnlikeApt()) gloTrigPat|= 0x800;
1056 if (gloTrg->PairLikeLpt()) gloTrigPat|= 0x1000;
1057 if (gloTrg->PairLikeHpt()) gloTrigPat|= 0x2000;
1058 if (gloTrg->PairLikeApt()) gloTrigPat|= 0x4000;
1062 // local trigger for tracking
1063 localTrigger = fMUONData->LocalTrigger();
1064 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1065 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1066 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1068 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1069 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1070 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1071 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1072 Int_t stripX21 = locTrg->LoStripX()+locTrg->LoDev()+1;
1073 Float_t y21 = circuit->GetY21Pos(stripX21);
1074 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1075 Float_t thetax = TMath::ATan2( x11 , z11 );
1076 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1078 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1079 // since static statement does not work, set gloTrigPat for each track
1081 // fNRecTriggerTracks++;
1082 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
1083 } // end of loop on Local Trigger
1087 //__________________________________________________________________________
1088 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1090 // To make track candidates with two segments in stations(1..) 4 and 5,
1091 // the first segment being pointed to by "BegSegment".
1092 // Returns the number of such track candidates.
1093 Int_t endStation, iEndSegment, nbCan2Seg;
1094 AliMUONSegment *endSegment, *extrapSegment;
1095 AliMUONTrack *recTrack;
1097 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1098 // Station for the end segment
1099 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1100 // multiple scattering factor corresponding to one chamber
1101 mcsFactor = 0.0136 /
1102 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1103 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1104 // linear extrapolation to end station
1106 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
1107 // number of candidates with 2 segments to 0
1109 // Loop over segments in the end station
1110 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1111 // pointer to segment
1112 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1113 // test compatibility between current segment and "extrapSegment"
1114 // 4 because 4 quantities in chi2
1116 NormalizedChi2WithSegment(extrapSegment,
1117 fMaxSigma2Distance)) <= 4.0) {
1118 // both segments compatible:
1119 // make track candidate from "begSegment" and "endSegment"
1120 if (fPrintLevel >= 2)
1121 cout << "TrackCandidate with Segment " << iEndSegment <<
1122 " in Station(0..) " << endStation << endl;
1123 // flag for both segments in one track:
1124 // to be done in track constructor ????
1125 BegSegment->SetInTrack(kTRUE);
1126 endSegment->SetInTrack(kTRUE);
1127 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1128 AliMUONTrack(BegSegment, endSegment, this);
1130 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1131 // increment number of track candidates with 2 segments
1134 } // for (iEndSegment = 0;...
1135 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1139 //__________________________________________________________________________
1140 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1142 // To make track candidates with one segment and one point
1143 // in stations(1..) 4 and 5,
1144 // the segment being pointed to by "BegSegment".
1145 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1146 AliMUONHitForRec *extrapHitForRec, *hit;
1147 AliMUONTrack *recTrack;
1149 if (fPrintLevel >= 1)
1150 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1151 // station for the end point
1152 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1153 // multiple scattering factor corresponding to one chamber
1154 mcsFactor = 0.0136 /
1155 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1156 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1157 // first and second chambers(0..) in the end station
1158 ch1 = 2 * endStation;
1160 // number of candidates to 0
1162 // Loop over chambers of the end station
1163 for (ch = ch2; ch >= ch1; ch--) {
1164 // linear extrapolation to chamber
1166 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1167 // limits for the hit index in the loop
1168 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1169 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1170 // Loop over HitForRec's in the chamber
1171 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1172 // pointer to HitForRec
1173 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1174 // test compatibility between current HitForRec and "extrapHitForRec"
1175 // 2 because 2 quantities in chi2
1177 NormalizedChi2WithHitForRec(extrapHitForRec,
1178 fMaxSigma2Distance)) <= 2.0) {
1179 // both HitForRec's compatible:
1180 // make track candidate from begSegment and current HitForRec
1181 if (fPrintLevel >= 2)
1182 cout << "TrackCandidate with HitForRec " << iHit <<
1183 " in Chamber(0..) " << ch << endl;
1184 // flag for beginning segments in one track:
1185 // to be done in track constructor ????
1186 BegSegment->SetInTrack(kTRUE);
1187 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1188 AliMUONTrack(BegSegment, hit, this);
1189 // the right place to eliminate "double counting" ???? how ????
1191 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1192 // increment number of track candidates
1195 } // for (iHit = iHitMin;...
1196 delete extrapHitForRec;
1197 } // for (ch = ch2;...
1198 return nbCan1Seg1Hit;
1201 //__________________________________________________________________________
1202 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1204 // To make track candidates
1205 // with at least 3 aligned points in stations(1..) 4 and 5
1206 // (two Segment's or one Segment and one HitForRec)
1207 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1208 AliMUONSegment *begSegment;
1209 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1210 // Loop over stations(1..) 5 and 4 for the beginning segment
1211 for (begStation = 4; begStation > 2; begStation--) {
1212 // Loop over segments in the beginning station
1213 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1214 // pointer to segment
1215 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1216 if (fPrintLevel >= 2)
1217 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1218 " in Station(0..) " << begStation << endl;
1219 // Look for track candidates with two segments,
1220 // "begSegment" and all compatible segments in other station.
1221 // Only for beginning station(1..) 5
1222 // because candidates with 2 segments have to looked for only once.
1223 if (begStation == 4)
1224 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1225 // Look for track candidates with one segment and one point,
1226 // "begSegment" and all compatible HitForRec's in other station.
1227 // Only if "begSegment" does not belong already to a track candidate.
1228 // Is that a too strong condition ????
1229 if (!(begSegment->GetInTrack()))
1230 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1231 } // for (iBegSegment = 0;...
1232 } // for (begStation = 4;...
1236 //__________________________________________________________________________
1237 void AliMUONEventReconstructor::FollowTracks(void)
1239 // Follow tracks in stations(1..) 3, 2 and 1
1240 // too long: should be made more modular !!!!
1241 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1242 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1243 AliMUONTrack *track, *nextTrack;
1244 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1245 // -1 to avoid compilation warnings
1246 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1247 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1248 Double_t bendingMomentum, chi2Norm = 0.;
1249 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1250 // local maxSigma2Distance, for easy increase in testing
1251 maxSigma2Distance = fMaxSigma2Distance;
1252 if (fPrintLevel >= 2)
1253 cout << "enter FollowTracks" << endl;
1254 // Loop over track candidates
1255 track = (AliMUONTrack*) fRecTracksPtr->First();
1258 // Follow function for each track candidate ????
1260 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1261 if (fPrintLevel >= 2)
1262 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1263 // Fit track candidate
1264 track->SetFitMCS(0); // without multiple Coulomb scattering
1265 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1266 track->SetFitStart(0); // from parameters at vertex
1268 if (fPrintLevel >= 10) {
1269 cout << "FollowTracks: track candidate(0..): " << trackIndex
1270 << " after fit in stations(0..) 3 and 4" << endl;
1271 track->RecursiveDump();
1273 // Loop over stations(1..) 3, 2 and 1
1274 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1275 // otherwise: majority coincidence 2 !!!!
1276 for (station = 2; station >= 0; station--) {
1277 // Track parameters at first track hit (smallest Z)
1278 trackParam1 = ((AliMUONTrackHit*)
1279 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1280 // extrapolation to station
1281 trackParam1->ExtrapToStation(station, trackParam);
1282 extrapSegment = new AliMUONSegment(); // empty segment
1283 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1284 // multiple scattering factor corresponding to one chamber
1285 // and momentum in bending plane (not total)
1286 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1287 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1288 // Z difference from previous station
1289 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1290 (&(pMUON->Chamber(2 * station + 2)))->Z();
1291 // Z difference between the two previous stations
1292 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1293 (&(pMUON->Chamber(2 * station + 4)))->Z();
1294 // Z difference between the two chambers in the previous station
1295 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1296 (&(pMUON->Chamber(2 * station + 1)))->Z();
1297 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1299 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1300 extrapSegment->UpdateFromStationTrackParam
1301 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1302 trackParam1->GetInverseBendingMomentum());
1303 // same thing for corrected segment
1304 // better to use copy constructor, after checking that it works properly !!!!
1305 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1307 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1308 extrapCorrSegment->UpdateFromStationTrackParam
1309 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1310 trackParam1->GetInverseBendingMomentum());
1313 if (fPrintLevel >= 10) {
1314 cout << "FollowTracks: track candidate(0..): " << trackIndex
1315 << " Look for segment in station(0..): " << station << endl;
1317 // Loop over segments in station
1318 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1319 // Look for best compatible Segment in station
1320 // should consider all possibilities ????
1321 // multiple scattering ????
1322 // separation in 2 functions: Segment and HitForRec ????
1323 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1324 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1325 // according to real Z value of "segment" and slopes of "extrapSegment"
1327 SetBendingCoor(extrapSegment->GetBendingCoor() +
1328 extrapSegment->GetBendingSlope() *
1329 (segment->GetHitForRec1()->GetZ() -
1330 (&(pMUON->Chamber(2 * station)))->Z()));
1332 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1333 extrapSegment->GetNonBendingSlope() *
1334 (segment->GetHitForRec1()->GetZ() -
1335 (&(pMUON->Chamber(2 * station)))->Z()));
1337 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1338 if (chi2 < bestChi2) {
1339 // update best Chi2 and Segment if better found
1340 bestSegment = segment;
1345 // best segment found: add it to track candidate
1346 track->AddSegment(bestSegment);
1347 // set track parameters at these two TrakHit's
1348 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1349 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1350 if (fPrintLevel >= 10) {
1351 cout << "FollowTracks: track candidate(0..): " << trackIndex
1352 << " Added segment in station(0..): " << station << endl;
1353 track->RecursiveDump();
1357 // No best segment found:
1358 // Look for best compatible HitForRec in station:
1359 // should consider all possibilities ????
1360 // multiple scattering ???? do about like for extrapSegment !!!!
1361 extrapHit = new AliMUONHitForRec(); // empty hit
1362 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1365 if (fPrintLevel >= 10) {
1366 cout << "FollowTracks: track candidate(0..): " << trackIndex
1367 << " Segment not found, look for hit in station(0..): " << station
1370 // Loop over chambers of the station
1371 for (chInStation = 0; chInStation < 2; chInStation++) {
1372 // coordinates of extrapolated hit
1374 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1376 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1377 // resolutions from "extrapSegment"
1378 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1379 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1380 // same things for corrected hit
1381 // better to use copy constructor, after checking that it works properly !!!!
1383 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1385 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1386 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1387 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1388 // Loop over hits in the chamber
1389 ch = 2 * station + chInStation;
1390 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1391 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1392 fNHitsForRecPerChamber[ch];
1394 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1395 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1396 // according to real Z value of "hit" and slopes of right "trackParam"
1398 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1399 (&(trackParam[chInStation]))->GetBendingSlope() *
1401 (&(trackParam[chInStation]))->GetZ()));
1403 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1404 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1406 (&(trackParam[chInStation]))->GetZ()));
1407 // condition for hit not already in segment ????
1408 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1409 if (chi2 < bestChi2) {
1410 // update best Chi2 and HitForRec if better found
1413 chBestHit = chInStation;
1418 // best hit found: add it to track candidate
1419 track->AddHitForRec(bestHit);
1420 // set track parameters at this TrackHit
1421 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1422 &(trackParam[chBestHit]));
1423 if (fPrintLevel >= 10) {
1424 cout << "FollowTracks: track candidate(0..): " << trackIndex
1425 << " Added hit in station(0..): " << station << endl;
1426 track->RecursiveDump();
1430 // Remove current track candidate
1431 // and corresponding TrackHit's, ...
1433 delete extrapSegment;
1434 delete extrapCorrSegment;
1436 delete extrapCorrHit;
1437 break; // stop the search for this candidate:
1438 // exit from the loop over station
1441 delete extrapCorrHit;
1443 delete extrapSegment;
1444 delete extrapCorrSegment;
1445 // Sort track hits according to increasing Z
1446 track->GetTrackHitsPtr()->Sort();
1447 // Update track parameters at first track hit (smallest Z)
1448 trackParam1 = ((AliMUONTrackHit*)
1449 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1450 bendingMomentum = 0.;
1451 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1452 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1453 // Track removed if bendingMomentum not in window [min, max]
1454 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1456 break; // stop the search for this candidate:
1457 // exit from the loop over station
1460 // with multiple Coulomb scattering if all stations
1461 if (station == 0) track->SetFitMCS(1);
1462 // without multiple Coulomb scattering if not all stations
1463 else track->SetFitMCS(0);
1464 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1465 track->SetFitStart(1); // from parameters at first hit
1467 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1468 if (numberOfDegFree > 0) {
1469 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1473 // Track removed if normalized chi2 too high
1474 if (chi2Norm > fMaxChi2) {
1476 break; // stop the search for this candidate:
1477 // exit from the loop over station
1479 if (fPrintLevel >= 10) {
1480 cout << "FollowTracks: track candidate(0..): " << trackIndex
1481 << " after fit from station(0..): " << station << " to 4" << endl;
1482 track->RecursiveDump();
1484 // Track extrapolation to the vertex through the absorber (Branson)
1485 // after going through the first station
1487 trackParamVertex = *trackParam1;
1488 (&trackParamVertex)->ExtrapToVertex();
1489 track->SetTrackParamAtVertex(&trackParamVertex);
1490 if (fPrintLevel >= 1) {
1491 cout << "FollowTracks: track candidate(0..): " << trackIndex
1492 << " after extrapolation to vertex" << endl;
1493 track->RecursiveDump();
1496 } // for (station = 2;...
1497 // go really to next track
1500 // Compression of track array (necessary after Remove ????)
1501 fRecTracksPtr->Compress();
1505 //__________________________________________________________________________
1506 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1508 // To remove double tracks.
1509 // Tracks are considered identical
1510 // if they have at least half of their hits in common.
1511 // Among two identical tracks, one keeps the track with the larger number of hits
1512 // or, if these numbers are equal, the track with the minimum Chi2.
1513 AliMUONTrack *track1, *track2, *trackToRemove;
1514 Bool_t identicalTracks;
1515 Int_t hitsInCommon, nHits1, nHits2;
1516 identicalTracks = kTRUE;
1517 while (identicalTracks) {
1518 identicalTracks = kFALSE;
1519 // Loop over first track of the pair
1520 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1521 while (track1 && (!identicalTracks)) {
1522 nHits1 = track1->GetNTrackHits();
1523 // Loop over second track of the pair
1524 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1525 while (track2 && (!identicalTracks)) {
1526 nHits2 = track2->GetNTrackHits();
1527 // number of hits in common between two tracks
1528 hitsInCommon = track1->HitsInCommon(track2);
1529 // check for identical tracks
1530 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1531 identicalTracks = kTRUE;
1532 // decide which track to remove
1533 if (nHits1 > nHits2) trackToRemove = track2;
1534 else if (nHits1 < nHits2) trackToRemove = track1;
1535 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1536 trackToRemove = track2;
1537 else trackToRemove = track1;
1539 trackToRemove->Remove();
1541 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1543 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1549 //__________________________________________________________________________
1550 void AliMUONEventReconstructor::EventDump(void)
1552 // Dump reconstructed event (track parameters at vertex and at first hit),
1553 // and the particle parameters
1555 AliMUONTrack *track;
1556 AliMUONTrackParam *trackParam, *trackParam1;
1557 Double_t bendingSlope, nonBendingSlope, pYZ;
1558 Double_t pX, pY, pZ, x, y, z, c;
1559 Int_t np, trackIndex, nTrackHits;
1561 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1562 if (fPrintLevel >= 1) {
1563 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1565 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1566 // Loop over reconstructed tracks
1567 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1568 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1569 if (fPrintLevel >= 1)
1570 cout << " track number: " << trackIndex << endl;
1571 // function for each track for modularity ????
1572 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1573 nTrackHits = track->GetNTrackHits();
1574 if (fPrintLevel >= 1)
1575 cout << " number of track hits: " << nTrackHits << endl;
1576 // track parameters at Vertex
1577 trackParam = track->GetTrackParamAtVertex();
1578 x = trackParam->GetNonBendingCoor();
1579 y = trackParam->GetBendingCoor();
1580 z = trackParam->GetZ();
1581 bendingSlope = trackParam->GetBendingSlope();
1582 nonBendingSlope = trackParam->GetNonBendingSlope();
1583 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1584 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1585 pX = pZ * nonBendingSlope;
1586 pY = pZ * bendingSlope;
1587 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1588 if (fPrintLevel >= 1)
1589 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1590 z, x, y, pX, pY, pZ, c);
1592 // track parameters at first hit
1593 trackParam1 = ((AliMUONTrackHit*)
1594 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1595 x = trackParam1->GetNonBendingCoor();
1596 y = trackParam1->GetBendingCoor();
1597 z = trackParam1->GetZ();
1598 bendingSlope = trackParam1->GetBendingSlope();
1599 nonBendingSlope = trackParam1->GetNonBendingSlope();
1600 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1601 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1602 pX = pZ * nonBendingSlope;
1603 pY = pZ * bendingSlope;
1604 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1605 if (fPrintLevel >= 1)
1606 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1607 z, x, y, pX, pY, pZ, c);
1609 // informations about generated particles
1610 np = gAlice->GetMCApp()->GetNtrack();
1611 printf(" **** number of generated particles: %d \n", np);
1613 // for (Int_t iPart = 0; iPart < np; iPart++) {
1614 // p = gAlice->Particle(iPart);
1615 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1616 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1622 //__________________________________________________________________________
1623 void AliMUONEventReconstructor::EventDumpTrigger(void)
1625 // Dump reconstructed trigger event
1626 // and the particle parameters
1628 AliMUONTriggerTrack *triggertrack ;
1629 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
1631 if (fPrintLevel >= 1) {
1632 cout << "****** enter EventDumpTrigger ******" << endl;
1633 cout << " Number of Reconstructed tracks :" << nTriggerTracks << endl;
1635 // Loop over reconstructed tracks
1636 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1637 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
1638 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1640 triggertrack->GetX11(),triggertrack->GetY11(),
1641 triggertrack->GetThetax(),triggertrack->GetThetay());
1645 //__________________________________________________________________________
1646 void AliMUONEventReconstructor::FillEvent()
1648 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1649 // leaf in the Event branch of TreeRecoEvent tree
1650 cout << "Enter FillEvent() ...\n";
1653 fRecoEvent = new AliMUONRecoEvent();
1655 fRecoEvent->Clear();
1657 //save current directory
1658 TDirectory *current = gDirectory;
1659 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1660 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1661 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1662 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1663 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1664 TBranch *branch = fEventTree->GetBranch("Event");
1665 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1666 branch->SetAutoDelete();
1671 // restore directory
1675 //__________________________________________________________________________
1676 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1678 // To make initial tracks for Kalman filter from the list of segments
1680 AliMUONSegment *segment;
1681 AliMUONTrackK *trackK;
1683 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1684 // Reset the TClonesArray of reconstructed tracks
1685 if (fRecTracksPtr) fRecTracksPtr->Delete();
1686 // Delete in order that the Track destructors are called,
1687 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1690 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1691 // Loop over stations(1...) 5 and 4
1692 for (istat=4; istat>=3; istat--) {
1693 // Loop over segments in the station
1694 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1695 // Transform segments to tracks and evaluate covariance matrix
1696 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1697 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1699 } // for (iseg=0;...)
1700 } // for (istat=4;...)
1704 //__________________________________________________________________________
1705 void AliMUONEventReconstructor::FollowTracksK(void)
1707 // Follow tracks using Kalman filter
1709 Int_t icand, ichamBeg, ichamEnd, chamBits;
1710 Double_t zDipole1, zDipole2;
1711 AliMUONTrackK *trackK;
1712 AliMUONHitForRec *hit;
1713 AliMUONRawCluster *clus;
1714 TClonesArray *rawclusters;
1716 clus = 0; rawclusters = 0;
1718 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1719 zDipole2 = zDipole1 + GetSimpleBLength();
1722 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1723 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1724 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1725 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1727 cout << " Hit #" << hit->GetChamberNumber() << " ";
1728 cout << hit->GetBendingCoor() << " ";
1729 cout << hit->GetNonBendingCoor() << " ";
1730 cout << hit->GetZ() << " ";
1731 cout << hit->GetGeantSignal() << " ";
1732 cout << hit->GetTHTrack() << endl;
1735 printf(" Hit # %d %10.4f %10.4f %10.4f",
1736 hit->GetChamberNumber(), hit->GetBendingCoor(),
1737 hit->GetNonBendingCoor(), hit->GetZ());
1738 if (fRecGeantHits) {
1740 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1742 // from raw clusters
1743 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1744 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1746 printf("%3d", clus->fTracks[1]-1);
1747 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1754 Int_t nSeeds = fNRecTracks; // starting number of seeds
1755 // Loop over track candidates
1756 while (icand < fNRecTracks-1) {
1758 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1760 // Discard candidate which will produce the double track
1762 Ok = CheckCandidateK(icand,nSeeds);
1764 //trackK->SetRecover(-1); // mark candidate to be removed
1770 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1771 trackK->GetHitOnTrack()->Last(); // last hit
1772 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1773 ichamBeg = hit->GetChamberNumber();
1775 // Check propagation direction
1776 if (trackK->GetTrackDir() > 0) {
1777 ichamEnd = 9; // forward propagation
1778 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1780 ichamBeg = ichamEnd;
1781 ichamEnd = 6; // backward propagation
1782 // Change weight matrix and zero fChi2 for backpropagation
1783 trackK->StartBack();
1784 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1785 ichamBeg = ichamEnd;
1789 if (trackK->GetBPFlag()) {
1791 ichamEnd = 6; // backward propagation
1792 // Change weight matrix and zero fChi2 for backpropagation
1793 trackK->StartBack();
1794 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1795 ichamBeg = ichamEnd;
1801 trackK->SetTrackDir(-1);
1802 trackK->SetBPFlag(kFALSE);
1803 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1805 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1806 else trackK->SetRecover(-1); // mark candidate to be removed
1808 // Majority 3 of 4 in first 2 stations
1810 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1811 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1812 chamBits |= BIT(hit->GetChamberNumber()-1);
1814 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1815 //mark candidate to be removed
1818 for (Int_t i=0; i<fNRecTracks; i++) {
1819 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1820 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1823 // Compress TClonesArray
1824 fRecTracksPtr->Compress();
1825 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1829 //__________________________________________________________________________
1830 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1832 // Discards track candidate if it will produce the double track (having
1833 // the same seed segment hits as hits of a good track found before)
1834 AliMUONTrackK *track1, *track2;
1835 AliMUONHitForRec *hit1, *hit2, *hit;
1837 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1838 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1839 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1841 for (Int_t i=0; i<icand; i++) {
1842 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1843 //if (track2->GetRecover() < 0) continue;
1844 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1846 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1850 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1851 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1852 if (hit == hit1 || hit == hit2) {
1854 if (nSame == 2) return kFALSE;
1856 } // for (Int_t j=0;
1858 } // for (Int_t i=0;
1862 //__________________________________________________________________________
1863 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1865 // Removes double tracks (sharing more than half of their hits). Keeps
1866 // the track with higher quality
1867 AliMUONTrackK *track1, *track2, *trackToKill;
1869 // Sort tracks according to their quality
1870 fRecTracksPtr->Sort();
1872 // Loop over first track of the pair
1873 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1875 // Loop over second track of the pair
1876 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1878 // Check whether or not to keep track2
1879 if (!track2->KeepTrack(track1)) {
1880 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1881 " " << track2->GetTrackQuality() << endl;
1882 trackToKill = track2;
1883 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1884 trackToKill->Kill();
1885 fRecTracksPtr->Compress();
1886 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1888 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1891 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1892 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1895 //__________________________________________________________________________
1896 void AliMUONEventReconstructor::GoToVertex(void)
1898 // Propagates track to the vertex thru absorber
1899 // (using Branson correction for now)
1903 for (Int_t i=0; i<fNRecTracks; i++) {
1904 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1905 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1906 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1907 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber