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 Float_t y21 = circuit->GetY21Pos(locTrg->LoStripX());
1073 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1074 Float_t thetax = TMath::ATan2( x11 , z11 );
1075 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1077 recTriggerTrack = new AliMUONTriggerTrack(x11,y11,thetax,thetay,gloTrigPat,this);
1078 // since static statement does not work, set gloTrigPat for each track
1080 // fNRecTriggerTracks++;
1081 fMUONData->AddRecTriggerTrack(*recTriggerTrack);
1082 } // end of loop on Local Trigger
1086 //__________________________________________________________________________
1087 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1089 // To make track candidates with two segments in stations(1..) 4 and 5,
1090 // the first segment being pointed to by "BegSegment".
1091 // Returns the number of such track candidates.
1092 Int_t endStation, iEndSegment, nbCan2Seg;
1093 AliMUONSegment *endSegment, *extrapSegment;
1094 AliMUONTrack *recTrack;
1096 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1097 // Station for the end segment
1098 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1099 // multiple scattering factor corresponding to one chamber
1100 mcsFactor = 0.0136 /
1101 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1102 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1103 // linear extrapolation to end station
1105 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
1106 // number of candidates with 2 segments to 0
1108 // Loop over segments in the end station
1109 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1110 // pointer to segment
1111 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1112 // test compatibility between current segment and "extrapSegment"
1113 // 4 because 4 quantities in chi2
1115 NormalizedChi2WithSegment(extrapSegment,
1116 fMaxSigma2Distance)) <= 4.0) {
1117 // both segments compatible:
1118 // make track candidate from "begSegment" and "endSegment"
1119 if (fPrintLevel >= 2)
1120 cout << "TrackCandidate with Segment " << iEndSegment <<
1121 " in Station(0..) " << endStation << endl;
1122 // flag for both segments in one track:
1123 // to be done in track constructor ????
1124 BegSegment->SetInTrack(kTRUE);
1125 endSegment->SetInTrack(kTRUE);
1126 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1127 AliMUONTrack(BegSegment, endSegment, this);
1129 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1130 // increment number of track candidates with 2 segments
1133 } // for (iEndSegment = 0;...
1134 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1138 //__________________________________________________________________________
1139 Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1141 // To make track candidates with one segment and one point
1142 // in stations(1..) 4 and 5,
1143 // the segment being pointed to by "BegSegment".
1144 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1145 AliMUONHitForRec *extrapHitForRec, *hit;
1146 AliMUONTrack *recTrack;
1148 if (fPrintLevel >= 1)
1149 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1150 // station for the end point
1151 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1152 // multiple scattering factor corresponding to one chamber
1153 mcsFactor = 0.0136 /
1154 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1155 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1156 // first and second chambers(0..) in the end station
1157 ch1 = 2 * endStation;
1159 // number of candidates to 0
1161 // Loop over chambers of the end station
1162 for (ch = ch2; ch >= ch1; ch--) {
1163 // linear extrapolation to chamber
1165 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1166 // limits for the hit index in the loop
1167 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1168 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1169 // Loop over HitForRec's in the chamber
1170 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1171 // pointer to HitForRec
1172 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1173 // test compatibility between current HitForRec and "extrapHitForRec"
1174 // 2 because 2 quantities in chi2
1176 NormalizedChi2WithHitForRec(extrapHitForRec,
1177 fMaxSigma2Distance)) <= 2.0) {
1178 // both HitForRec's compatible:
1179 // make track candidate from begSegment and current HitForRec
1180 if (fPrintLevel >= 2)
1181 cout << "TrackCandidate with HitForRec " << iHit <<
1182 " in Chamber(0..) " << ch << endl;
1183 // flag for beginning segments in one track:
1184 // to be done in track constructor ????
1185 BegSegment->SetInTrack(kTRUE);
1186 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1187 AliMUONTrack(BegSegment, hit, this);
1188 // the right place to eliminate "double counting" ???? how ????
1190 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1191 // increment number of track candidates
1194 } // for (iHit = iHitMin;...
1195 delete extrapHitForRec;
1196 } // for (ch = ch2;...
1197 return nbCan1Seg1Hit;
1200 //__________________________________________________________________________
1201 void AliMUONEventReconstructor::MakeTrackCandidates(void)
1203 // To make track candidates
1204 // with at least 3 aligned points in stations(1..) 4 and 5
1205 // (two Segment's or one Segment and one HitForRec)
1206 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1207 AliMUONSegment *begSegment;
1208 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1209 // Loop over stations(1..) 5 and 4 for the beginning segment
1210 for (begStation = 4; begStation > 2; begStation--) {
1211 // Loop over segments in the beginning station
1212 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1213 // pointer to segment
1214 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1215 if (fPrintLevel >= 2)
1216 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1217 " in Station(0..) " << begStation << endl;
1218 // Look for track candidates with two segments,
1219 // "begSegment" and all compatible segments in other station.
1220 // Only for beginning station(1..) 5
1221 // because candidates with 2 segments have to looked for only once.
1222 if (begStation == 4)
1223 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
1224 // Look for track candidates with one segment and one point,
1225 // "begSegment" and all compatible HitForRec's in other station.
1226 // Only if "begSegment" does not belong already to a track candidate.
1227 // Is that a too strong condition ????
1228 if (!(begSegment->GetInTrack()))
1229 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1230 } // for (iBegSegment = 0;...
1231 } // for (begStation = 4;...
1235 //__________________________________________________________________________
1236 void AliMUONEventReconstructor::FollowTracks(void)
1238 // Follow tracks in stations(1..) 3, 2 and 1
1239 // too long: should be made more modular !!!!
1240 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1241 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
1242 AliMUONTrack *track, *nextTrack;
1243 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
1244 // -1 to avoid compilation warnings
1245 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
1246 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
1247 Double_t bendingMomentum, chi2Norm = 0.;
1248 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
1249 // local maxSigma2Distance, for easy increase in testing
1250 maxSigma2Distance = fMaxSigma2Distance;
1251 if (fPrintLevel >= 2)
1252 cout << "enter FollowTracks" << endl;
1253 // Loop over track candidates
1254 track = (AliMUONTrack*) fRecTracksPtr->First();
1257 // Follow function for each track candidate ????
1259 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
1260 if (fPrintLevel >= 2)
1261 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
1262 // Fit track candidate
1263 track->SetFitMCS(0); // without multiple Coulomb scattering
1264 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1265 track->SetFitStart(0); // from parameters at vertex
1267 if (fPrintLevel >= 10) {
1268 cout << "FollowTracks: track candidate(0..): " << trackIndex
1269 << " after fit in stations(0..) 3 and 4" << endl;
1270 track->RecursiveDump();
1272 // Loop over stations(1..) 3, 2 and 1
1273 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1274 // otherwise: majority coincidence 2 !!!!
1275 for (station = 2; station >= 0; station--) {
1276 // Track parameters at first track hit (smallest Z)
1277 trackParam1 = ((AliMUONTrackHit*)
1278 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1279 // extrapolation to station
1280 trackParam1->ExtrapToStation(station, trackParam);
1281 extrapSegment = new AliMUONSegment(); // empty segment
1282 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
1283 // multiple scattering factor corresponding to one chamber
1284 // and momentum in bending plane (not total)
1285 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1286 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1287 // Z difference from previous station
1288 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1289 (&(pMUON->Chamber(2 * station + 2)))->Z();
1290 // Z difference between the two previous stations
1291 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1292 (&(pMUON->Chamber(2 * station + 4)))->Z();
1293 // Z difference between the two chambers in the previous station
1294 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1295 (&(pMUON->Chamber(2 * station + 1)))->Z();
1296 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1298 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1299 extrapSegment->UpdateFromStationTrackParam
1300 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1301 trackParam1->GetInverseBendingMomentum());
1302 // same thing for corrected segment
1303 // better to use copy constructor, after checking that it works properly !!!!
1304 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1306 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1307 extrapCorrSegment->UpdateFromStationTrackParam
1308 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1309 trackParam1->GetInverseBendingMomentum());
1312 if (fPrintLevel >= 10) {
1313 cout << "FollowTracks: track candidate(0..): " << trackIndex
1314 << " Look for segment in station(0..): " << station << endl;
1316 // Loop over segments in station
1317 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1318 // Look for best compatible Segment in station
1319 // should consider all possibilities ????
1320 // multiple scattering ????
1321 // separation in 2 functions: Segment and HitForRec ????
1322 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
1323 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1324 // according to real Z value of "segment" and slopes of "extrapSegment"
1326 SetBendingCoor(extrapSegment->GetBendingCoor() +
1327 extrapSegment->GetBendingSlope() *
1328 (segment->GetHitForRec1()->GetZ() -
1329 (&(pMUON->Chamber(2 * station)))->Z()));
1331 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1332 extrapSegment->GetNonBendingSlope() *
1333 (segment->GetHitForRec1()->GetZ() -
1334 (&(pMUON->Chamber(2 * station)))->Z()));
1336 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
1337 if (chi2 < bestChi2) {
1338 // update best Chi2 and Segment if better found
1339 bestSegment = segment;
1344 // best segment found: add it to track candidate
1345 track->AddSegment(bestSegment);
1346 // set track parameters at these two TrakHit's
1347 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1348 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1349 if (fPrintLevel >= 10) {
1350 cout << "FollowTracks: track candidate(0..): " << trackIndex
1351 << " Added segment in station(0..): " << station << endl;
1352 track->RecursiveDump();
1356 // No best segment found:
1357 // Look for best compatible HitForRec in station:
1358 // should consider all possibilities ????
1359 // multiple scattering ???? do about like for extrapSegment !!!!
1360 extrapHit = new AliMUONHitForRec(); // empty hit
1361 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
1364 if (fPrintLevel >= 10) {
1365 cout << "FollowTracks: track candidate(0..): " << trackIndex
1366 << " Segment not found, look for hit in station(0..): " << station
1369 // Loop over chambers of the station
1370 for (chInStation = 0; chInStation < 2; chInStation++) {
1371 // coordinates of extrapolated hit
1373 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1375 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1376 // resolutions from "extrapSegment"
1377 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1378 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1379 // same things for corrected hit
1380 // better to use copy constructor, after checking that it works properly !!!!
1382 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1384 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1385 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1386 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
1387 // Loop over hits in the chamber
1388 ch = 2 * station + chInStation;
1389 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1390 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1391 fNHitsForRecPerChamber[ch];
1393 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1394 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1395 // according to real Z value of "hit" and slopes of right "trackParam"
1397 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1398 (&(trackParam[chInStation]))->GetBendingSlope() *
1400 (&(trackParam[chInStation]))->GetZ()));
1402 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1403 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1405 (&(trackParam[chInStation]))->GetZ()));
1406 // condition for hit not already in segment ????
1407 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1408 if (chi2 < bestChi2) {
1409 // update best Chi2 and HitForRec if better found
1412 chBestHit = chInStation;
1417 // best hit found: add it to track candidate
1418 track->AddHitForRec(bestHit);
1419 // set track parameters at this TrackHit
1420 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1421 &(trackParam[chBestHit]));
1422 if (fPrintLevel >= 10) {
1423 cout << "FollowTracks: track candidate(0..): " << trackIndex
1424 << " Added hit in station(0..): " << station << endl;
1425 track->RecursiveDump();
1429 // Remove current track candidate
1430 // and corresponding TrackHit's, ...
1432 delete extrapSegment;
1433 delete extrapCorrSegment;
1435 delete extrapCorrHit;
1436 break; // stop the search for this candidate:
1437 // exit from the loop over station
1440 delete extrapCorrHit;
1442 delete extrapSegment;
1443 delete extrapCorrSegment;
1444 // Sort track hits according to increasing Z
1445 track->GetTrackHitsPtr()->Sort();
1446 // Update track parameters at first track hit (smallest Z)
1447 trackParam1 = ((AliMUONTrackHit*)
1448 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1449 bendingMomentum = 0.;
1450 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1451 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1452 // Track removed if bendingMomentum not in window [min, max]
1453 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1455 break; // stop the search for this candidate:
1456 // exit from the loop over station
1459 // with multiple Coulomb scattering if all stations
1460 if (station == 0) track->SetFitMCS(1);
1461 // without multiple Coulomb scattering if not all stations
1462 else track->SetFitMCS(0);
1463 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1464 track->SetFitStart(1); // from parameters at first hit
1466 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1467 if (numberOfDegFree > 0) {
1468 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1472 // Track removed if normalized chi2 too high
1473 if (chi2Norm > fMaxChi2) {
1475 break; // stop the search for this candidate:
1476 // exit from the loop over station
1478 if (fPrintLevel >= 10) {
1479 cout << "FollowTracks: track candidate(0..): " << trackIndex
1480 << " after fit from station(0..): " << station << " to 4" << endl;
1481 track->RecursiveDump();
1483 // Track extrapolation to the vertex through the absorber (Branson)
1484 // after going through the first station
1486 trackParamVertex = *trackParam1;
1487 (&trackParamVertex)->ExtrapToVertex();
1488 track->SetTrackParamAtVertex(&trackParamVertex);
1489 if (fPrintLevel >= 1) {
1490 cout << "FollowTracks: track candidate(0..): " << trackIndex
1491 << " after extrapolation to vertex" << endl;
1492 track->RecursiveDump();
1495 } // for (station = 2;...
1496 // go really to next track
1499 // Compression of track array (necessary after Remove ????)
1500 fRecTracksPtr->Compress();
1504 //__________________________________________________________________________
1505 void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1507 // To remove double tracks.
1508 // Tracks are considered identical
1509 // if they have at least half of their hits in common.
1510 // Among two identical tracks, one keeps the track with the larger number of hits
1511 // or, if these numbers are equal, the track with the minimum Chi2.
1512 AliMUONTrack *track1, *track2, *trackToRemove;
1513 Bool_t identicalTracks;
1514 Int_t hitsInCommon, nHits1, nHits2;
1515 identicalTracks = kTRUE;
1516 while (identicalTracks) {
1517 identicalTracks = kFALSE;
1518 // Loop over first track of the pair
1519 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1520 while (track1 && (!identicalTracks)) {
1521 nHits1 = track1->GetNTrackHits();
1522 // Loop over second track of the pair
1523 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1524 while (track2 && (!identicalTracks)) {
1525 nHits2 = track2->GetNTrackHits();
1526 // number of hits in common between two tracks
1527 hitsInCommon = track1->HitsInCommon(track2);
1528 // check for identical tracks
1529 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1530 identicalTracks = kTRUE;
1531 // decide which track to remove
1532 if (nHits1 > nHits2) trackToRemove = track2;
1533 else if (nHits1 < nHits2) trackToRemove = track1;
1534 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1535 trackToRemove = track2;
1536 else trackToRemove = track1;
1538 trackToRemove->Remove();
1540 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1542 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1548 //__________________________________________________________________________
1549 void AliMUONEventReconstructor::EventDump(void)
1551 // Dump reconstructed event (track parameters at vertex and at first hit),
1552 // and the particle parameters
1554 AliMUONTrack *track;
1555 AliMUONTrackParam *trackParam, *trackParam1;
1556 Double_t bendingSlope, nonBendingSlope, pYZ;
1557 Double_t pX, pY, pZ, x, y, z, c;
1558 Int_t np, trackIndex, nTrackHits;
1560 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1561 if (fPrintLevel >= 1) {
1562 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1564 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1565 // Loop over reconstructed tracks
1566 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
1567 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
1568 if (fPrintLevel >= 1)
1569 cout << " track number: " << trackIndex << endl;
1570 // function for each track for modularity ????
1571 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1572 nTrackHits = track->GetNTrackHits();
1573 if (fPrintLevel >= 1)
1574 cout << " number of track hits: " << nTrackHits << endl;
1575 // track parameters at Vertex
1576 trackParam = track->GetTrackParamAtVertex();
1577 x = trackParam->GetNonBendingCoor();
1578 y = trackParam->GetBendingCoor();
1579 z = trackParam->GetZ();
1580 bendingSlope = trackParam->GetBendingSlope();
1581 nonBendingSlope = trackParam->GetNonBendingSlope();
1582 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1583 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1584 pX = pZ * nonBendingSlope;
1585 pY = pZ * bendingSlope;
1586 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1587 if (fPrintLevel >= 1)
1588 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1589 z, x, y, pX, pY, pZ, c);
1591 // track parameters at first hit
1592 trackParam1 = ((AliMUONTrackHit*)
1593 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1594 x = trackParam1->GetNonBendingCoor();
1595 y = trackParam1->GetBendingCoor();
1596 z = trackParam1->GetZ();
1597 bendingSlope = trackParam1->GetBendingSlope();
1598 nonBendingSlope = trackParam1->GetNonBendingSlope();
1599 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1600 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1601 pX = pZ * nonBendingSlope;
1602 pY = pZ * bendingSlope;
1603 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1604 if (fPrintLevel >= 1)
1605 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1606 z, x, y, pX, pY, pZ, c);
1608 // informations about generated particles
1609 np = gAlice->GetMCApp()->GetNtrack();
1610 printf(" **** number of generated particles: %d \n", np);
1612 // for (Int_t iPart = 0; iPart < np; iPart++) {
1613 // p = gAlice->Particle(iPart);
1614 // printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1615 // iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1621 //__________________________________________________________________________
1622 void AliMUONEventReconstructor::EventDumpTrigger(void)
1624 // Dump reconstructed trigger event
1625 // and the particle parameters
1627 AliMUONTriggerTrack *triggertrack ;
1628 Int_t nTriggerTracks = fMUONData->RecTriggerTracks()->GetEntriesFast();
1630 if (fPrintLevel >= 1) {
1631 cout << "****** enter EventDumpTrigger ******" << endl;
1632 cout << " Number of Reconstructed tracks :" << nTriggerTracks << endl;
1634 // Loop over reconstructed tracks
1635 for (Int_t trackIndex = 0; trackIndex < nTriggerTracks; trackIndex++) {
1636 triggertrack = (AliMUONTriggerTrack*)fMUONData->RecTriggerTracks()->At(trackIndex);
1637 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1639 triggertrack->GetX11(),triggertrack->GetY11(),
1640 triggertrack->GetThetax(),triggertrack->GetThetay());
1644 //__________________________________________________________________________
1645 void AliMUONEventReconstructor::FillEvent()
1647 // Create a new AliMUONRecoEvent, fill its track list, then add it as a
1648 // leaf in the Event branch of TreeRecoEvent tree
1649 cout << "Enter FillEvent() ...\n";
1652 fRecoEvent = new AliMUONRecoEvent();
1654 fRecoEvent->Clear();
1656 //save current directory
1657 TDirectory *current = gDirectory;
1658 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1659 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
1660 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1661 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
1662 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1663 TBranch *branch = fEventTree->GetBranch("Event");
1664 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
1665 branch->SetAutoDelete();
1670 // restore directory
1674 //__________________________________________________________________________
1675 void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1677 // To make initial tracks for Kalman filter from the list of segments
1679 AliMUONSegment *segment;
1680 AliMUONTrackK *trackK;
1682 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1683 // Reset the TClonesArray of reconstructed tracks
1684 if (fRecTracksPtr) fRecTracksPtr->Delete();
1685 // Delete in order that the Track destructors are called,
1686 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1689 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1690 // Loop over stations(1...) 5 and 4
1691 for (istat=4; istat>=3; istat--) {
1692 // Loop over segments in the station
1693 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1694 // Transform segments to tracks and evaluate covariance matrix
1695 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1696 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1698 } // for (iseg=0;...)
1699 } // for (istat=4;...)
1703 //__________________________________________________________________________
1704 void AliMUONEventReconstructor::FollowTracksK(void)
1706 // Follow tracks using Kalman filter
1708 Int_t icand, ichamBeg, ichamEnd, chamBits;
1709 Double_t zDipole1, zDipole2;
1710 AliMUONTrackK *trackK;
1711 AliMUONHitForRec *hit;
1712 AliMUONRawCluster *clus;
1713 TClonesArray *rawclusters;
1715 clus = 0; rawclusters = 0;
1717 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1718 zDipole2 = zDipole1 + GetSimpleBLength();
1721 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1722 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1723 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1724 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1726 cout << " Hit #" << hit->GetChamberNumber() << " ";
1727 cout << hit->GetBendingCoor() << " ";
1728 cout << hit->GetNonBendingCoor() << " ";
1729 cout << hit->GetZ() << " ";
1730 cout << hit->GetGeantSignal() << " ";
1731 cout << hit->GetTHTrack() << endl;
1734 printf(" Hit # %d %10.4f %10.4f %10.4f",
1735 hit->GetChamberNumber(), hit->GetBendingCoor(),
1736 hit->GetNonBendingCoor(), hit->GetZ());
1737 if (fRecGeantHits) {
1739 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1741 // from raw clusters
1742 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1743 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1745 printf("%3d", clus->fTracks[1]-1);
1746 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1753 Int_t nSeeds = fNRecTracks; // starting number of seeds
1754 // Loop over track candidates
1755 while (icand < fNRecTracks-1) {
1757 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1759 // Discard candidate which will produce the double track
1761 Ok = CheckCandidateK(icand,nSeeds);
1763 //trackK->SetRecover(-1); // mark candidate to be removed
1769 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1770 trackK->GetHitOnTrack()->Last(); // last hit
1771 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1772 ichamBeg = hit->GetChamberNumber();
1774 // Check propagation direction
1775 if (trackK->GetTrackDir() > 0) {
1776 ichamEnd = 9; // forward propagation
1777 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1779 ichamBeg = ichamEnd;
1780 ichamEnd = 6; // backward propagation
1781 // Change weight matrix and zero fChi2 for backpropagation
1782 trackK->StartBack();
1783 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1784 ichamBeg = ichamEnd;
1788 if (trackK->GetBPFlag()) {
1790 ichamEnd = 6; // backward propagation
1791 // Change weight matrix and zero fChi2 for backpropagation
1792 trackK->StartBack();
1793 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1794 ichamBeg = ichamEnd;
1800 trackK->SetTrackDir(-1);
1801 trackK->SetBPFlag(kFALSE);
1802 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1804 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1805 else trackK->SetRecover(-1); // mark candidate to be removed
1807 // Majority 3 of 4 in first 2 stations
1809 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1810 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1811 chamBits |= BIT(hit->GetChamberNumber()-1);
1813 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1814 //mark candidate to be removed
1817 for (Int_t i=0; i<fNRecTracks; i++) {
1818 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1819 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1822 // Compress TClonesArray
1823 fRecTracksPtr->Compress();
1824 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1828 //__________________________________________________________________________
1829 Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1831 // Discards track candidate if it will produce the double track (having
1832 // the same seed segment hits as hits of a good track found before)
1833 AliMUONTrackK *track1, *track2;
1834 AliMUONHitForRec *hit1, *hit2, *hit;
1836 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1837 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1838 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1840 for (Int_t i=0; i<icand; i++) {
1841 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1842 //if (track2->GetRecover() < 0) continue;
1843 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1845 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1849 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1850 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1851 if (hit == hit1 || hit == hit2) {
1853 if (nSame == 2) return kFALSE;
1855 } // for (Int_t j=0;
1857 } // for (Int_t i=0;
1861 //__________________________________________________________________________
1862 void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1864 // Removes double tracks (sharing more than half of their hits). Keeps
1865 // the track with higher quality
1866 AliMUONTrackK *track1, *track2, *trackToKill;
1868 // Sort tracks according to their quality
1869 fRecTracksPtr->Sort();
1871 // Loop over first track of the pair
1872 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1874 // Loop over second track of the pair
1875 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1877 // Check whether or not to keep track2
1878 if (!track2->KeepTrack(track1)) {
1879 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1880 " " << track2->GetTrackQuality() << endl;
1881 trackToKill = track2;
1882 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1883 trackToKill->Kill();
1884 fRecTracksPtr->Compress();
1885 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1887 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1890 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1891 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1894 //__________________________________________________________________________
1895 void AliMUONEventReconstructor::GoToVertex(void)
1897 // Propagates track to the vertex thru absorber
1898 // (using Branson correction for now)
1902 for (Int_t i=0; i<fNRecTracks; i++) {
1903 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1904 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1905 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1906 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber