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a9e2aefa 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
88cb7938 16/* $Id$ */
a9e2aefa 17
3831f268 18////////////////////////////////////
a9e2aefa 19//
20// MUON event reconstructor in ALICE
21//
22// This class contains as data:
23// * the parameters for the event reconstruction
24// * a pointer to the array of hits to be reconstructed (the event)
25// * a pointer to the array of segments made with these hits inside each station
26// * a pointer to the array of reconstructed tracks
27//
28// It contains as methods, among others:
29// * MakeEventToBeReconstructed to build the array of hits to be reconstructed
30// * MakeSegments to build the segments
31// * MakeTracks to build the tracks
3831f268 32//
33////////////////////////////////////
a9e2aefa 34
70479d0e 35#include <Riostream.h> // for cout
82a4bc7b 36#include <stdlib.h> // for exit()
a9e2aefa 37
94de3818 38#include <TTree.h>
a9e2aefa 39
a9e2aefa 40#include "AliMUON.h"
3831f268 41#include "AliMUONChamber.h"
42#include "AliMUONEventReconstructor.h"
a9e2aefa 43#include "AliMUONHitForRec.h"
276c44b7 44#include "AliMUONTriggerTrack.h"
45//#include "AliMUONTriggerConstants.h"
46#include "AliMUONTriggerCircuit.h"
a9e2aefa 47#include "AliMUONRawCluster.h"
276c44b7 48#include "AliMUONLocalTrigger.h"
3831f268 49#include "AliMUONRecoEvent.h"
50#include "AliMUONSegment.h"
a9e2aefa 51#include "AliMUONTrack.h"
a9e2aefa 52#include "AliMUONTrackHit.h"
94de3818 53#include "AliMagF.h"
3831f268 54#include "AliRun.h" // for gAlice
88cb7938 55#include "AliConfig.h"
56#include "AliRunLoader.h"
57#include "AliLoader.h"
83dbc640 58#include "AliMUONTrackK.h" //AZ
59#include <TMatrixD.h> //AZ
5d12ce38 60#include "AliMC.h"
a9e2aefa 61
a9e2aefa 62//************* Defaults parameters for reconstruction
9cbdf048 63static const Double_t kDefaultMinBendingMomentum = 3.0;
d0bfce8d 64static const Double_t kDefaultMaxBendingMomentum = 500.0;
65static const Double_t kDefaultMaxChi2 = 100.0;
9cbdf048 66static const Double_t kDefaultMaxSigma2Distance = 16.0;
67static const Double_t kDefaultBendingResolution = 0.01;
68static const Double_t kDefaultNonBendingResolution = 0.144;
69static const Double_t kDefaultChamberThicknessInX0 = 0.03;
a9e2aefa 70// Simple magnetic field:
71// Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG
72// Length and Position from reco_muon.F, with opposite sign:
73// Length = ZMAGEND-ZCOIL
74// Position = (ZMAGEND+ZCOIL)/2
75// to be ajusted differently from real magnetic field ????
9cbdf048 76static const Double_t kDefaultSimpleBValue = 7.0;
77static const Double_t kDefaultSimpleBLength = 428.0;
78static const Double_t kDefaultSimpleBPosition = 1019.0;
79static const Int_t kDefaultRecGeantHits = 0;
80static const Double_t kDefaultEfficiency = 0.95;
a9e2aefa 81
70b6e084 82static const Int_t kDefaultPrintLevel = -1;
a9e2aefa 83
84ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context
85
86 //__________________________________________________________________________
87AliMUONEventReconstructor::AliMUONEventReconstructor(void)
88{
89 // Constructor for class AliMUONEventReconstructor
90 SetReconstructionParametersToDefaults();
83dbc640 91 fTrackMethod = 1; //AZ - tracking method (1-default, 2-Kalman)
a9e2aefa 92 // Memory allocation for the TClonesArray of hits for reconstruction
93 // Is 10000 the right size ????
94 fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000);
95 fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ????
96 // Memory allocation for the TClonesArray's of segments in stations
97 // Is 2000 the right size ????
9cbdf048 98 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 99 fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000);
100 fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ????
101 }
102 // Memory allocation for the TClonesArray of reconstructed tracks
103 // Is 10 the right size ????
104 fRecTracksPtr = new TClonesArray("AliMUONTrack", 10);
105 fNRecTracks = 0; // really needed or GetEntriesFast sufficient ????
276c44b7 106// trigger tracks
107 fRecTriggerTracksPtr = new TClonesArray("AliMUONTriggerTrack", 10);
108 fNRecTriggerTracks = 0; // really needed or GetEntriesFast sufficient ????
8429a5e4 109 // Memory allocation for the TClonesArray of hits on reconstructed tracks
110 // Is 100 the right size ????
111 fRecTrackHitsPtr = new TClonesArray("AliMUONTrack", 100);
112 fNRecTrackHits = 0; // really needed or GetEntriesFast sufficient ????
a9e2aefa 113
5b64e914 114 // Sign of fSimpleBValue according to sign of Bx value at (50,50,-950).
a6f03ddb 115 Float_t b[3], x[3];
5b64e914 116 x[0] = 50.; x[1] = 50.; x[2] = -950.;
a6f03ddb 117 gAlice->Field()->Field(x, b);
065bd0e1 118 fSimpleBValue = TMath::Sign(fSimpleBValue,(Double_t) b[0]);
5b64e914 119 fSimpleBPosition = TMath::Sign(fSimpleBPosition,(Double_t) x[2]);
a6f03ddb 120 // See how to get fSimple(BValue, BLength, BPosition)
121 // automatically calculated from the actual magnetic field ????
a9e2aefa 122
123 if (fPrintLevel >= 0) {
a6f03ddb 124 cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();
125 cout << endl << "Magnetic field from root file:" << endl;
126 gAlice->Field()->Dump();
127 cout << endl;
128 }
c7ba256d 129
47a6b602 130 // Initializions for GEANT background events
131 fBkgGeantFile = 0;
132 fBkgGeantTK = 0;
133 fBkgGeantParticles = 0;
134 fBkgGeantTH = 0;
135 fBkgGeantHits = 0;
136 fBkgGeantEventNumber = -1;
137
c7ba256d 138 // Initialize to 0 pointers to RecoEvent, tree and tree file
139 fRecoEvent = 0;
140 fEventTree = 0;
141 fTreeFile = 0;
142
a9e2aefa 143 return;
144}
145
d9a3473d 146AliMUONEventReconstructor::AliMUONEventReconstructor (const AliMUONEventReconstructor& Reconstructor):TObject(Reconstructor)
9cbdf048 147{
148 // Dummy copy constructor
149}
150
d9a3473d 151AliMUONEventReconstructor & AliMUONEventReconstructor::operator=(const AliMUONEventReconstructor& /*Reconstructor*/)
9cbdf048 152{
153 // Dummy assignment operator
154 return *this;
155}
156
a9e2aefa 157 //__________________________________________________________________________
158AliMUONEventReconstructor::~AliMUONEventReconstructor(void)
159{
160 // Destructor for class AliMUONEventReconstructor
c7ba256d 161 if (fTreeFile) {
162 fTreeFile->Close();
163 delete fTreeFile;
164 }
165// if (fEventTree) delete fEventTree;
166 if (fRecoEvent) delete fRecoEvent;
a9e2aefa 167 delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ????
9cbdf048 168 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 169 delete fSegmentsPtr[st]; // Correct destruction of everything ????
170 return;
171}
172
173 //__________________________________________________________________________
174void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void)
175{
176 // Set reconstruction parameters to default values
177 // Would be much more convenient with a structure (or class) ????
9cbdf048 178 fMinBendingMomentum = kDefaultMinBendingMomentum;
d0bfce8d 179 fMaxBendingMomentum = kDefaultMaxBendingMomentum;
180 fMaxChi2 = kDefaultMaxChi2;
9cbdf048 181 fMaxSigma2Distance = kDefaultMaxSigma2Distance;
a9e2aefa 182
9cbdf048 183 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON");
a9e2aefa 184 // ******** Parameters for making HitsForRec
185 // minimum radius,
186 // like in TRACKF_STAT:
187 // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3;
188 // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9
9cbdf048 189 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
190 if (ch < 4) fRMin[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
a9e2aefa 191 2.0 * TMath::Pi() / 180.0;
192 else fRMin[ch] = 30.0;
d0bfce8d 193 // maximum radius at 10 degrees and Z of chamber
194 fRMax[ch] = TMath::Abs((&(pMUON->Chamber(ch)))->Z()) *
195 10.0 * TMath::Pi() / 180.0;
a9e2aefa 196 }
a9e2aefa 197
198 // ******** Parameters for making segments
199 // should be parametrized ????
200 // according to interval between chambers in a station ????
201 // Maximum distance in non bending plane
202 // 5 * 0.22 just to remember the way it was made in TRACKF_STAT
203 // SIGCUT*DYMAX(IZ)
9cbdf048 204 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
a9e2aefa 205 fSegmentMaxDistNonBending[st] = 5. * 0.22;
860cef81 206 // Maximum distance in bending plane:
207 // values from TRACKF_STAT, corresponding to (J psi 20cm),
208 // scaled to the real distance between chambers in a station
ef21c79e 209 fSegmentMaxDistBending[0] = TMath::Abs( 1.5 *
210 ((&(pMUON->Chamber(1)))->Z() - (&(pMUON->Chamber(0)))->Z()) / 20.0);
211 fSegmentMaxDistBending[1] = TMath::Abs( 1.5 *
212 ((&(pMUON->Chamber(3)))->Z() - (&(pMUON->Chamber(2)))->Z()) / 20.0);
213 fSegmentMaxDistBending[2] = TMath::Abs( 3.0 *
214 ((&(pMUON->Chamber(5)))->Z() - (&(pMUON->Chamber(4)))->Z()) / 20.0);
215 fSegmentMaxDistBending[3] = TMath::Abs( 6.0 *
216 ((&(pMUON->Chamber(7)))->Z() - (&(pMUON->Chamber(6)))->Z()) / 20.0);
217 fSegmentMaxDistBending[4] = TMath::Abs( 6.0 *
218 ((&(pMUON->Chamber(9)))->Z() - (&(pMUON->Chamber(8)))->Z()) / 20.0);
a9e2aefa 219
9cbdf048 220 fBendingResolution = kDefaultBendingResolution;
221 fNonBendingResolution = kDefaultNonBendingResolution;
222 fChamberThicknessInX0 = kDefaultChamberThicknessInX0;
223 fSimpleBValue = kDefaultSimpleBValue;
224 fSimpleBLength = kDefaultSimpleBLength;
225 fSimpleBPosition = kDefaultSimpleBPosition;
226 fRecGeantHits = kDefaultRecGeantHits;
227 fEfficiency = kDefaultEfficiency;
228 fPrintLevel = kDefaultPrintLevel;
a9e2aefa 229 return;
230}
231
232//__________________________________________________________________________
3831f268 233Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) const
a9e2aefa 234{
235 // Returns impact parameter at vertex in bending plane (cm),
236 // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c),
237 // using simple values for dipole magnetic field.
065bd0e1 238 // The sign of "BendingMomentum" is the sign of the charge.
a9e2aefa 239 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
240 BendingMomentum);
241}
242
243//__________________________________________________________________________
3831f268 244Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) const
a9e2aefa 245{
246 // Returns signed bending momentum in bending plane (GeV/c),
065bd0e1 247 // the sign being the sign of the charge for particles moving forward in Z,
a9e2aefa 248 // from the impact parameter "ImpactParam" at vertex in bending plane (cm),
249 // using simple values for dipole magnetic field.
a9e2aefa 250 return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition /
251 ImpactParam);
252}
253
254//__________________________________________________________________________
255void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName)
256{
257 // Set background file ... for GEANT hits
258 // Must be called after having loaded the firts signal event
259 if (fPrintLevel >= 0) {
260 cout << "Enter SetBkgGeantFile with BkgGeantFileName ``"
261 << BkgGeantFileName << "''" << endl;}
262 if (strlen(BkgGeantFileName)) {
263 // BkgGeantFileName not empty: try to open the file
264 if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();}
265 fBkgGeantFile = new TFile(BkgGeantFileName);
266 if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();}
267 if (fBkgGeantFile-> IsOpen()) {
268 if (fPrintLevel >= 0) {
269 cout << "Background for GEANT hits in file: ``" << BkgGeantFileName
270 << "'' successfully opened" << endl;}
271 }
272 else {
273 cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl;
274 cout << "NOT FOUND: EXIT" << endl;
275 exit(0); // right instruction for exit ????
276 }
277 // Arrays for "particles" and "hits"
278 fBkgGeantParticles = new TClonesArray("TParticle", 200);
279 fBkgGeantHits = new TClonesArray("AliMUONHit", 2000);
280 // Event number to -1 for initialization
281 fBkgGeantEventNumber = -1;
282 // Back to the signal file:
283 // first signal event must have been loaded previously,
284 // otherwise, Segmentation violation at the next instruction
285 // How is it possible to do smething better ????
286 ((gAlice->TreeK())->GetCurrentFile())->cd();
287 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
288 }
289 return;
290}
291
292//__________________________________________________________________________
293void AliMUONEventReconstructor::NextBkgGeantEvent(void)
294{
295 // Get next event in background file for GEANT hits
296 // Goes back to event number 0 when end of file is reached
297 char treeName[20];
298 TBranch *branch;
299 if (fPrintLevel >= 0) {
300 cout << "Enter NextBkgGeantEvent" << endl;}
301 // Clean previous event
302 if(fBkgGeantTK) delete fBkgGeantTK;
303 fBkgGeantTK = NULL;
304 if(fBkgGeantParticles) fBkgGeantParticles->Clear();
305 if(fBkgGeantTH) delete fBkgGeantTH;
306 fBkgGeantTH = NULL;
307 if(fBkgGeantHits) fBkgGeantHits->Clear();
308 // Increment event number
309 fBkgGeantEventNumber++;
310 // Get access to Particles and Hits for event from background file
311 if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();}
312 fBkgGeantFile->cd();
313 if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();}
314 // Particles: TreeK for event and branch "Particles"
315 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
316 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
317 if (!fBkgGeantTK) {
318 if (fPrintLevel >= 0) {
319 cout << "Cannot find Kine Tree for background event: " <<
320 fBkgGeantEventNumber << endl;
321 cout << "Goes back to event 0" << endl;
322 }
323 fBkgGeantEventNumber = 0;
324 sprintf(treeName, "TreeK%d", fBkgGeantEventNumber);
325 fBkgGeantTK = (TTree*)gDirectory->Get(treeName);
326 if (!fBkgGeantTK) {
327 cout << "ERROR: cannot find Kine Tree for background event: " <<
328 fBkgGeantEventNumber << endl;
329 exit(0);
330 }
331 }
332 if (fBkgGeantTK)
333 fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles);
334 fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ????
335 // Hits: TreeH for event and branch "MUON"
336 sprintf(treeName, "TreeH%d", fBkgGeantEventNumber);
337 fBkgGeantTH = (TTree*)gDirectory->Get(treeName);
338 if (!fBkgGeantTH) {
339 cout << "ERROR: cannot find Hits Tree for background event: " <<
340 fBkgGeantEventNumber << endl;
341 exit(0);
342 }
343 if (fBkgGeantTH && fBkgGeantHits) {
344 branch = fBkgGeantTH->GetBranch("MUON");
345 if (branch) branch->SetAddress(&fBkgGeantHits);
346 }
347 fBkgGeantTH->GetEntries(); // necessary ????
348 // Back to the signal file
349 ((gAlice->TreeK())->GetCurrentFile())->cd();
350 if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();}
351 return;
352}
353
354//__________________________________________________________________________
355void AliMUONEventReconstructor::EventReconstruct(void)
356{
357 // To reconstruct one event
358 if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl;
359 MakeEventToBeReconstructed();
360 MakeSegments();
361 MakeTracks();
362 return;
363}
364
276c44b7 365//__________________________________________________________________________
366void AliMUONEventReconstructor::EventReconstructTrigger(void)
367{
368 // To reconstruct one event
369 if (fPrintLevel >= 1) cout << "enter EventReconstructTrigger" << endl;
370 MakeTriggerTracks();
371 return;
372}
373
a9e2aefa 374 //__________________________________________________________________________
375void AliMUONEventReconstructor::ResetHitsForRec(void)
376{
377 // To reset the array and the number of HitsForRec,
378 // and also the number of HitsForRec
379 // and the index of the first HitForRec per chamber
380 if (fHitsForRecPtr) fHitsForRecPtr->Clear();
381 fNHitsForRec = 0;
9cbdf048 382 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++)
a9e2aefa 383 fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0;
384 return;
385}
386
387 //__________________________________________________________________________
388void AliMUONEventReconstructor::ResetSegments(void)
389{
390 // To reset the TClonesArray of segments and the number of Segments
391 // for all stations
9cbdf048 392 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 393 if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear();
394 fNSegments[st] = 0;
395 }
396 return;
397}
398
399 //__________________________________________________________________________
400void AliMUONEventReconstructor::ResetTracks(void)
401{
402 // To reset the TClonesArray of reconstructed tracks
8429a5e4 403 if (fRecTracksPtr) fRecTracksPtr->Delete();
404 // Delete in order that the Track destructors are called,
405 // hence the space for the TClonesArray of pointers to TrackHit's is freed
a9e2aefa 406 fNRecTracks = 0;
407 return;
408}
409
276c44b7 410 //__________________________________________________________________________
411void AliMUONEventReconstructor::ResetTriggerTracks(void)
412{
413 // To reset the TClonesArray of reconstructed trigger tracks
414 if (fRecTriggerTracksPtr) fRecTriggerTracksPtr->Delete();
415 // Delete in order that the Track destructors are called,
416 // hence the space for the TClonesArray of pointers to TrackHit's is freed
417 fNRecTriggerTracks = 0;
418 return;
419}
420
8429a5e4 421 //__________________________________________________________________________
422void AliMUONEventReconstructor::ResetTrackHits(void)
423{
424 // To reset the TClonesArray of hits on reconstructed tracks
425 if (fRecTrackHitsPtr) fRecTrackHitsPtr->Clear();
426 fNRecTrackHits = 0;
427 return;
428}
429
a9e2aefa 430 //__________________________________________________________________________
431void AliMUONEventReconstructor::MakeEventToBeReconstructed(void)
432{
433 // To make the list of hits to be reconstructed,
434 // either from the GEANT hits or from the raw clusters
435 // according to the parameter set for the reconstructor
88cb7938 436 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
437
438 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
439 if (rl == 0x0)
440 {
441 Error("MakeEventToBeReconstructed",
442 "Can not find Run Loader in Event Folder named %s.",
443 evfoldname.Data());
444 return;
445 }
446 AliLoader* gime = rl->GetLoader("MUONLoader");
447 if (gime == 0x0)
448 {
449 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
450 return;
451 }
452
a9e2aefa 453 if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl;
454 ResetHitsForRec();
455 if (fRecGeantHits == 1) {
456 // Reconstruction from GEANT hits
457 // Back to the signal file
88cb7938 458 TTree* treeH = gime->TreeH();
459 if (treeH == 0x0)
460 {
461 Int_t retval = gime->LoadHits();
462 if ( retval)
463 {
464 Error("MakeEventToBeReconstructed","Error occured while loading hits.");
465 return;
466 }
467 treeH = gime->TreeH();
468 if (treeH == 0x0)
469 {
470 Error("MakeEventToBeReconstructed","Can not get TreeH");
471 return;
472 }
473 }
474
475 AddHitsForRecFromGEANT(treeH);
476
a9e2aefa 477 // Background hits
478 AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits);
479 // Sort HitsForRec in increasing order with respect to chamber number
480 SortHitsForRecWithIncreasingChamber();
481 }
482 else {
483 // Reconstruction from raw clusters
484 // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
485 // Security on MUON ????
486 // TreeR assumed to be be "prepared" in calling function
487 // by "MUON->GetTreeR(nev)" ????
88cb7938 488 TTree *treeR = gime->TreeR();
9cbdf048 489 AddHitsForRecFromRawClusters(treeR);
a9e2aefa 490 // No sorting: it is done automatically in the previous function
491 }
492 if (fPrintLevel >= 10) {
493 cout << "end of MakeEventToBeReconstructed" << endl;
494 cout << "NHitsForRec: " << fNHitsForRec << endl;
9cbdf048 495 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 496 cout << "chamber(0...): " << ch
497 << " NHitsForRec: " << fNHitsForRecPerChamber[ch]
498 << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch]
499 << endl;
500 for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch];
501 hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch];
502 hit++) {
503 cout << "HitForRec index(0...): " << hit << endl;
504 ((*fHitsForRecPtr)[hit])->Dump();
505 }
506 }
507 }
508 return;
509}
510
511 //__________________________________________________________________________
512void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH)
513{
514 // To add to the list of hits for reconstruction
515 // the GEANT signal hits from a hit tree TH.
83dbc640 516 Int_t hitBits, chamBits; //AZ
a9e2aefa 517 if (fPrintLevel >= 2)
518 cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl;
519 if (TH == NULL) return;
9cbdf048 520 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
38302c61 521 AliMUONData * muondata = pMUON->GetMUONData();
a9e2aefa 522 // Security on MUON ????
523 // See whether it could be the same for signal and background ????
524 // Loop over tracks in tree
525 Int_t ntracks = (Int_t) TH->GetEntries();
526 if (fPrintLevel >= 2)
527 cout << "ntracks: " << ntracks << endl;
83dbc640 528 fMuons = 0; //AZ
a9e2aefa 529 for (Int_t track = 0; track < ntracks; track++) {
38302c61 530 muondata->ResetHits();
a9e2aefa 531 TH->GetEvent(track);
532 // Loop over hits
533 Int_t hit = 0;
83dbc640 534 hitBits = 0; // AZ
535 chamBits = 0; // AZ
536 Int_t itrack = track; //AZ
38302c61 537
538 Int_t ihit, nhits=0;
539 nhits = (Int_t) muondata->Hits()->GetEntriesFast();
540 AliMUONHit* mHit=0x0;
1391e633 541
38302c61 542 for(ihit=0; ihit<nhits; ihit++) {
543 mHit = static_cast<AliMUONHit*>(muondata->Hits()->At(ihit));
544 Int_t ipart = TMath::Abs ((Int_t) mHit->Particle()); //AZ
545 if (NewHitForRecFromGEANT(mHit,track, hit, 1) && ipart == 13
546 //if (NewHitForRecFromGEANT(mHit,itrack-1, hit, 1) && ipart == 13
1391e633 547 && itrack <= 2 && !BIT(mHit->Chamber()-1) ) chamBits |= BIT(mHit->Chamber()-1); //AZ - set bit
38302c61 548 }
1391e633 549
83dbc640 550 if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
551 chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3))
552 fMuons += 1; //AZ
553 //if (chamBits&3 && chamBits>>2&3 && chamBits>>4&3 && chamBits>>6&3 &&
554 // chamBits>>8&3 && ((chamBits>>6&3)==3 || (chamBits>>8&3)==3) &&
555 // ((chamBits&3)==3 || (chamBits>>2&3)==3)) fMuons += 1;
a9e2aefa 556 } // end of track loop
557 return;
558}
559
560 //__________________________________________________________________________
561void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits)
562{
563 // To add to the list of hits for reconstruction
564 // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list.
565 // How to have only one function "AddHitsForRecFromGEANT" ????
566 if (fPrintLevel >= 2)
567 cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl;
568 if (TH == NULL) return;
569 // Loop over tracks in tree
570 Int_t ntracks = (Int_t) TH->GetEntries();
571 if (fPrintLevel >= 2)
572 cout << "ntracks: " << ntracks << endl;
573 for (Int_t track = 0; track < ntracks; track++) {
574 if (Hits) Hits->Clear();
575 TH->GetEvent(track);
576 // Loop over hits
577 for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) {
578 NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0);
579 } // end of hit loop
580 } // end of track loop
581 return;
582}
583
584 //__________________________________________________________________________
585AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal)
586{
587 // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit",
588 // with hit number "HitNumber" in the track numbered "TrackNumber",
589 // either from signal ("Signal" = 1) or background ("Signal" = 0) event.
590 // Selects hits in tracking (not trigger) chambers.
591 // Takes into account the efficiency (fEfficiency)
592 // and the smearing from resolution (fBendingResolution and fNonBendingResolution).
593 // Adds a condition on the radius between RMin and RMax
594 // to better simulate the real chambers.
595 // Returns the pointer to the new hit for reconstruction,
596 // or NULL in case of inefficiency or non tracking chamber or bad radius.
597 // No condition on at most 20 cm from a muon from a resonance
598 // like in Fortran TRACKF_STAT.
599 AliMUONHitForRec* hitForRec;
600 Double_t bendCoor, nonBendCoor, radius;
0a5f36d9 601 Int_t chamber = Hit->Chamber() - 1; // chamber(0...)
a9e2aefa 602 // only in tracking chambers (fChamber starts at 1)
9cbdf048 603 if (chamber >= kMaxMuonTrackingChambers) return NULL;
a9e2aefa 604 // only if hit is efficient (keep track for checking ????)
605 if (gRandom->Rndm() > fEfficiency) return NULL;
606 // only if radius between RMin and RMax
94de3818 607 bendCoor = Hit->Y();
608 nonBendCoor = Hit->X();
a9e2aefa 609 radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor));
d0bfce8d 610 // This cut is not needed with a realistic chamber geometry !!!!
611// if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL;
a9e2aefa 612 // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's
613 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit);
614 fNHitsForRec++;
615 // add smearing from resolution
616 hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution));
617 hitForRec->SetNonBendingCoor(nonBendCoor
618 + gRandom->Gaus(0., fNonBendingResolution));
d0bfce8d 619// // !!!! without smearing
620// hitForRec->SetBendingCoor(bendCoor);
621// hitForRec->SetNonBendingCoor(nonBendCoor);
a9e2aefa 622 // more information into HitForRec
623 // resolution: angular effect to be added here ????
624 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
625 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
626 // GEANT track info
627 hitForRec->SetHitNumber(HitNumber);
628 hitForRec->SetTHTrack(TrackNumber);
629 hitForRec->SetGeantSignal(Signal);
630 if (fPrintLevel >= 10) {
631 cout << "track: " << TrackNumber << " hit: " << HitNumber << endl;
632 Hit->Dump();
633 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
634 hitForRec->Dump();}
635 return hitForRec;
636}
637
638 //__________________________________________________________________________
639void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber()
640{
641 // Sort HitsForRec's in increasing order with respect to chamber number.
642 // Uses the function "Compare".
643 // Update the information for HitsForRec per chamber too.
644 Int_t ch, nhits, prevch;
645 fHitsForRecPtr->Sort();
9cbdf048 646 for (ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 647 fNHitsForRecPerChamber[ch] = 0;
648 fIndexOfFirstHitForRecPerChamber[ch] = 0;
649 }
650 prevch = 0; // previous chamber
651 nhits = 0; // number of hits in current chamber
652 // Loop over HitsForRec
653 for (Int_t hit = 0; hit < fNHitsForRec; hit++) {
654 // chamber number (0...)
655 ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber();
656 // increment number of hits in current chamber
657 (fNHitsForRecPerChamber[ch])++;
658 // update index of first HitForRec in current chamber
659 // if chamber number different from previous one
660 if (ch != prevch) {
661 fIndexOfFirstHitForRecPerChamber[ch] = hit;
662 prevch = ch;
663 }
664 }
665 return;
666}
667
668// //__________________________________________________________________________
669// void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC)
670// {
671// // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS
672// // To add to the list of hits for reconstruction
673// // the (cathode correlated) raw clusters
674// // No condition added, like in Fortran TRACKF_STAT,
675// // on the radius between RMin and RMax.
676// AliMUONHitForRec *hitForRec;
677// if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl;
678// AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
679// // Security on MUON ????
680// // Loop over tracking chambers
9cbdf048 681// for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 682// // number of HitsForRec to 0 for the chamber
683// fNHitsForRecPerChamber[ch] = 0;
684// // index of first HitForRec for the chamber
685// if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
686// else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
687// TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch);
688// MUON->ResetReconstHits();
689// TC->GetEvent();
690// Int_t ncor = (Int_t)reconst_hits->GetEntries();
691// // Loop over (cathode correlated) raw clusters
692// for (Int_t cor = 0; cor < ncor; cor++) {
693// AliMUONReconstHit * mCor =
694// (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor);
695// // new AliMUONHitForRec from (cathode correlated) raw cluster
696// // and increment number of AliMUONHitForRec's (total and in chamber)
697// hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor);
698// fNHitsForRec++;
699// (fNHitsForRecPerChamber[ch])++;
700// // more information into HitForRec
701// hitForRec->SetChamberNumber(ch);
702// hitForRec->SetHitNumber(cor);
703// // Z coordinate of the chamber (cm) with sign opposite to GEANT sign
704// // could (should) be more exact from chamber geometry ????
705// hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z());
706// if (fPrintLevel >= 10) {
707// cout << "chamber (0...): " << ch <<
708// " cathcorrel (0...): " << cor << endl;
709// mCor->Dump();
710// cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
711// hitForRec->Dump();}
712// } // end of cluster loop
713// } // end of chamber loop
714// return;
715// }
716
717 //__________________________________________________________________________
718void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR)
719{
720 // To add to the list of hits for reconstruction all the raw clusters
721 // No condition added, like in Fortran TRACKF_STAT,
722 // on the radius between RMin and RMax.
723 AliMUONHitForRec *hitForRec;
724 AliMUONRawCluster *clus;
f69d51b5 725 Int_t iclus, nclus, nTRentries;
a9e2aefa 726 TClonesArray *rawclusters;
727 if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl;
88cb7938 728
729 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
730 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
731 if (rl == 0x0)
732 {
733 Error("MakeEventToBeReconstructed",
734 "Can not find Run Loader in Event Folder named %s.",
735 evfoldname.Data());
736 return;
737 }
738 AliLoader* gime = rl->GetLoader("MUONLoader");
739 if (gime == 0x0)
740 {
741 Error("MakeEventToBeReconstructed","Can not get MUON Loader from Run Loader.");
742 return;
743 }
744 // Loading AliRun master
a67d74fe 745 if (rl->GetAliRun() == 0x0) rl->LoadgAlice();
88cb7938 746 gAlice = rl->GetAliRun();
747
748 // Loading MUON subsystem
749 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
750
f69d51b5 751 nTRentries = Int_t(TR->GetEntries());
752 if (nTRentries != 1) {
753 cout << "Error in AliMUONEventReconstructor::AddHitsForRecFromRawClusters"
754 << endl;
755 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
756 exit(0);
757 }
88cb7938 758 gime->TreeR()->GetEvent(0); // only one entry
a9e2aefa 759 // Loop over tracking chambers
9cbdf048 760 for (Int_t ch = 0; ch < kMaxMuonTrackingChambers; ch++) {
a9e2aefa 761 // number of HitsForRec to 0 for the chamber
762 fNHitsForRecPerChamber[ch] = 0;
763 // index of first HitForRec for the chamber
764 if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0;
765 else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec;
ce3f5e87 766 rawclusters = pMUON->GetMUONData()->RawClusters(ch);
f69d51b5 767// pMUON->ResetRawClusters();
768// TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ????
a9e2aefa 769 nclus = (Int_t) (rawclusters->GetEntries());
770 // Loop over (cathode correlated) raw clusters
771 for (iclus = 0; iclus < nclus; iclus++) {
772 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus);
773 // new AliMUONHitForRec from raw cluster
774 // and increment number of AliMUONHitForRec's (total and in chamber)
775 hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus);
776 fNHitsForRec++;
777 (fNHitsForRecPerChamber[ch])++;
778 // more information into HitForRec
779 // resolution: info should be already in raw cluster and taken from it ????
780 hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution);
781 hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution);
782 // original raw cluster
783 hitForRec->SetChamberNumber(ch);
784 hitForRec->SetHitNumber(iclus);
ba5b68db 785 // Z coordinate of the raw cluster (cm)
cfe0107f 786 hitForRec->SetZ(clus->fZ[0]);
a9e2aefa 787 if (fPrintLevel >= 10) {
788 cout << "chamber (0...): " << ch <<
789 " raw cluster (0...): " << iclus << endl;
790 clus->Dump();
791 cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl;
792 hitForRec->Dump();}
793 } // end of cluster loop
794 } // end of chamber loop
83dbc640 795 SortHitsForRecWithIncreasingChamber(); //AZ
a9e2aefa 796 return;
797}
798
799 //__________________________________________________________________________
800void AliMUONEventReconstructor::MakeSegments(void)
801{
802 // To make the list of segments in all stations,
803 // from the list of hits to be reconstructed
804 if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl;
805 ResetSegments();
806 // Loop over stations
83dbc640 807 Int_t nb = (fTrackMethod == 2) ? 3 : 0; //AZ
808 //AZ for (Int_t st = 0; st < kMaxMuonTrackingStations; st++)
809 for (Int_t st = nb; st < kMaxMuonTrackingStations; st++) //AZ
a9e2aefa 810 MakeSegmentsPerStation(st);
811 if (fPrintLevel >= 10) {
812 cout << "end of MakeSegments" << endl;
9cbdf048 813 for (Int_t st = 0; st < kMaxMuonTrackingStations; st++) {
a9e2aefa 814 cout << "station(0...): " << st
815 << " Segments: " << fNSegments[st]
816 << endl;
817 for (Int_t seg = 0;
818 seg < fNSegments[st];
819 seg++) {
820 cout << "Segment index(0...): " << seg << endl;
821 ((*fSegmentsPtr[st])[seg])->Dump();
822 }
823 }
824 }
825 return;
826}
827
828 //__________________________________________________________________________
829void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station)
830{
831 // To make the list of segments in station number "Station" (0...)
832 // from the list of hits to be reconstructed.
833 // Updates "fNSegments"[Station].
834 // Segments in stations 4 and 5 are sorted
835 // according to increasing absolute value of "impact parameter"
836 AliMUONHitForRec *hit1Ptr, *hit2Ptr;
837 AliMUONSegment *segment;
838 Bool_t last2st;
839 Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor,
d0bfce8d 840 impactParam = 0., maxImpactParam = 0., minImpactParam = 0.; // =0 to avoid compilation warnings.
9cbdf048 841 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
a9e2aefa 842 if (fPrintLevel >= 1)
843 cout << "enter MakeSegmentsPerStation (0...) " << Station << endl;
844 // first and second chambers (0...) in the station
845 Int_t ch1 = 2 * Station;
846 Int_t ch2 = ch1 + 1;
847 // variable true for stations downstream of the dipole:
848 // Station(0..4) equal to 3 or 4
849 if ((Station == 3) || (Station == 4)) {
850 last2st = kTRUE;
851 // maximum impact parameter (cm) according to fMinBendingMomentum...
852 maxImpactParam =
853 TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum));
d0bfce8d 854 // minimum impact parameter (cm) according to fMaxBendingMomentum...
855 minImpactParam =
856 TMath::Abs(GetImpactParamFromBendingMomentum(fMaxBendingMomentum));
a9e2aefa 857 }
858 else last2st = kFALSE;
859 // extrapolation factor from Z of first chamber to Z of second chamber
860 // dZ to be changed to take into account fine structure of chambers ????
861 Double_t extrapFact =
9cbdf048 862 (&(pMUON->Chamber(ch2)))->Z() / (&(pMUON->Chamber(ch1)))->Z();
a9e2aefa 863 // index for current segment
864 Int_t segmentIndex = 0;
865 // Loop over HitsForRec in the first chamber of the station
866 for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1];
867 hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1];
868 hit1++) {
869 // pointer to the HitForRec
870 hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]);
871 // extrapolation,
872 // on the straight line joining the HitForRec to the vertex (0,0,0),
873 // to the Z of the second chamber of the station
874 extBendCoor = extrapFact * hit1Ptr->GetBendingCoor();
875 extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor();
876 // Loop over HitsForRec in the second chamber of the station
877 for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2];
878 hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2];
879 hit2++) {
880 // pointer to the HitForRec
881 hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]);
882 // absolute values of distances, in bending and non bending planes,
883 // between the HitForRec in the second chamber
884 // and the previous extrapolation
885 distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor);
886 distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor);
887 if (last2st) {
888 // bending slope
889 bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) /
890 (hit1Ptr->GetZ() - hit2Ptr->GetZ());
891 // absolute value of impact parameter
892 impactParam =
31817925 893 TMath::Abs(hit1Ptr->GetBendingCoor() - hit1Ptr->GetZ() * bendingSlope);
a9e2aefa 894 }
895 // check for distances not too large,
896 // and impact parameter not too big if stations downstream of the dipole.
897 // Conditions "distBend" and "impactParam" correlated for these stations ????
898 if ((distBend < fSegmentMaxDistBending[Station]) &&
899 (distNonBend < fSegmentMaxDistNonBending[Station]) &&
d0bfce8d 900 (!last2st || (impactParam < maxImpactParam)) &&
901 (!last2st || (impactParam > minImpactParam))) {
a9e2aefa 902 // make new segment
903 segment = new ((*fSegmentsPtr[Station])[segmentIndex])
904 AliMUONSegment(hit1Ptr, hit2Ptr);
905 // update "link" to this segment from the hit in the first chamber
906 if (hit1Ptr->GetNSegments() == 0)
907 hit1Ptr->SetIndexOfFirstSegment(segmentIndex);
908 hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1);
909 if (fPrintLevel >= 10) {
910 cout << "segmentIndex(0...): " << segmentIndex
911 << " distBend: " << distBend
912 << " distNonBend: " << distNonBend
913 << endl;
914 segment->Dump();
915 cout << "HitForRec in first chamber" << endl;
916 hit1Ptr->Dump();
917 cout << "HitForRec in second chamber" << endl;
918 hit2Ptr->Dump();
919 };
920 // increment index for current segment
921 segmentIndex++;
922 }
923 } //for (Int_t hit2
924 } // for (Int_t hit1...
925 fNSegments[Station] = segmentIndex;
926 // Sorting according to "impact parameter" if station(1..5) 4 or 5,
927 // i.e. Station(0..4) 3 or 4, using the function "Compare".
928 // After this sorting, it is impossible to use
929 // the "fNSegments" and "fIndexOfFirstSegment"
930 // of the HitForRec in the first chamber to explore all segments formed with it.
931 // Is this sorting really needed ????
932 if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort();
933 if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: "
934 << fNSegments[Station] << endl;
935 return;
936}
937
938 //__________________________________________________________________________
939void AliMUONEventReconstructor::MakeTracks(void)
940{
941 // To make the tracks,
942 // from the list of segments and points in all stations
943 if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl;
8429a5e4 944 // The order may be important for the following Reset's
a9e2aefa 945 ResetTracks();
8429a5e4 946 ResetTrackHits();
83dbc640 947 if (fTrackMethod == 2) { //AZ - Kalman filter
948 MakeTrackCandidatesK();
949 // Follow tracks in stations(1..) 3, 2 and 1
950 FollowTracksK();
951 // Remove double tracks
952 RemoveDoubleTracksK();
953 // Propagate tracks to the vertex thru absorber
954 GoToVertex();
955 } else { //AZ
956 // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5
957 MakeTrackCandidates();
958 // Follow tracks in stations(1..) 3, 2 and 1
959 FollowTracks();
960 // Remove double tracks
961 RemoveDoubleTracks();
962 }
a9e2aefa 963 return;
964}
965
276c44b7 966 //__________________________________________________________________________
967void AliMUONEventReconstructor::MakeTriggerTracks(void)
968{
969 // To make the trigger tracks from Local Trigger
970 if (fPrintLevel >= 1) cout << "enter MakeTriggerTracks" << endl;
971 ResetTriggerTracks();
972
973 Int_t nTRentries;
974 TClonesArray *localTrigger;
975 AliMUONLocalTrigger *locTrg;
976 AliMUONTriggerCircuit *circuit;
977 AliMUONTriggerTrack *recTriggerTrack;
978
979 TString evfoldname = AliConfig::fgkDefaultEventFolderName;//to be interfaced properly
980 AliRunLoader* rl = AliRunLoader::GetRunLoader(evfoldname);
981 if (rl == 0x0)
982 {
983 Error("MakeTriggerTracks",
984 "Can not find Run Loader in Event Folder named %s.",
985 evfoldname.Data());
986 return;
987 }
988 AliLoader* gime = rl->GetLoader("MUONLoader");
989 if (gime == 0x0)
990 {
991 Error("MakeTriggerTracks","Can not get MUON Loader from Run Loader.");
992 return;
993 }
994 TTree* TR = gime->TreeR();
995
996 // Loading AliRun master
a67d74fe 997 if (rl->GetAliRun() == 0x0) rl->LoadgAlice();
276c44b7 998 gAlice = rl->GetAliRun();
999
1000 // Loading MUON subsystem
1001 AliMUON * pMUON = (AliMUON *) gAlice->GetDetector("MUON");
1002
1003 nTRentries = Int_t(TR->GetEntries());
1004 if (nTRentries != 1) {
1005 cout << "Error in AliMUONEventReconstructor::MakeTriggerTracks"
1006 << endl;
1007 cout << "nTRentries = " << nTRentries << " not equal to 1" << endl;
1008 exit(0);
1009 }
1010 gime->TreeR()->GetEvent(0); // only one entry
1011
1012 pMUON->GetMUONData()->SetTreeAddress("GLT");
1013 pMUON->GetMUONData()->GetTrigger();
1014
1015 localTrigger = pMUON->GetMUONData()->LocalTrigger();
1016 Int_t nlocals = (Int_t) (localTrigger->GetEntries());
1017 Float_t z11 = ( &(pMUON->Chamber(10)) )->Z();
1018 Float_t z21 = ( &(pMUON->Chamber(12)) )->Z();
1019
1020 for (Int_t i=0; i<nlocals; i++) { // loop on Local Trigger
1021 locTrg = (AliMUONLocalTrigger*)localTrigger->UncheckedAt(i);
1022 circuit = &(pMUON->TriggerCircuit(locTrg->LoCircuit()));
1023 Float_t y11 = circuit->GetY11Pos(locTrg->LoStripX());
1024 Float_t y21 = circuit->GetY21Pos(locTrg->LoStripX());
1025 Float_t x11 = circuit->GetX11Pos(locTrg->LoStripY());
1026 Float_t thetax = TMath::ATan2( x11 , z11 );
1027 Float_t thetay = TMath::ATan2( (y21-y11) , (z21-z11) );
1028
1029 recTriggerTrack = new ((*fRecTriggerTracksPtr)[fNRecTriggerTracks])
1030 AliMUONTriggerTrack(x11,y11,thetax,thetay,this);
1031 fNRecTriggerTracks++;
1032 } // end of loop on Local Trigger
1033 return;
1034}
1035
a9e2aefa 1036 //__________________________________________________________________________
1037Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment)
1038{
1039 // To make track candidates with two segments in stations(1..) 4 and 5,
1040 // the first segment being pointed to by "BegSegment".
1041 // Returns the number of such track candidates.
1042 Int_t endStation, iEndSegment, nbCan2Seg;
1043 AliMUONSegment *endSegment, *extrapSegment;
1044 AliMUONTrack *recTrack;
1045 Double_t mcsFactor;
1046 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl;
1047 // Station for the end segment
1048 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1049 // multiple scattering factor corresponding to one chamber
1050 mcsFactor = 0.0136 /
1051 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1052 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1053 // linear extrapolation to end station
1054 extrapSegment =
1055 BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor);
1056 // number of candidates with 2 segments to 0
1057 nbCan2Seg = 0;
1058 // Loop over segments in the end station
1059 for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) {
1060 // pointer to segment
1061 endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]);
1062 // test compatibility between current segment and "extrapSegment"
04b5ea16 1063 // 4 because 4 quantities in chi2
a9e2aefa 1064 if ((endSegment->
1065 NormalizedChi2WithSegment(extrapSegment,
1066 fMaxSigma2Distance)) <= 4.0) {
1067 // both segments compatible:
1068 // make track candidate from "begSegment" and "endSegment"
1069 if (fPrintLevel >= 2)
1070 cout << "TrackCandidate with Segment " << iEndSegment <<
1071 " in Station(0..) " << endStation << endl;
1072 // flag for both segments in one track:
1073 // to be done in track constructor ????
1074 BegSegment->SetInTrack(kTRUE);
1075 endSegment->SetInTrack(kTRUE);
1076 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1077 AliMUONTrack(BegSegment, endSegment, this);
1078 fNRecTracks++;
1079 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1080 // increment number of track candidates with 2 segments
1081 nbCan2Seg++;
1082 }
1083 } // for (iEndSegment = 0;...
1084 delete extrapSegment; // should not delete HitForRec's it points to !!!!
1085 return nbCan2Seg;
1086}
1087
1088 //__________________________________________________________________________
1089Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment)
1090{
1091 // To make track candidates with one segment and one point
1092 // in stations(1..) 4 and 5,
1093 // the segment being pointed to by "BegSegment".
1094 Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit;
1095 AliMUONHitForRec *extrapHitForRec, *hit;
1096 AliMUONTrack *recTrack;
1097 Double_t mcsFactor;
1098 if (fPrintLevel >= 1)
1099 cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl;
1100 // station for the end point
1101 endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2;
1102 // multiple scattering factor corresponding to one chamber
1103 mcsFactor = 0.0136 /
1104 GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact());
1105 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1106 // first and second chambers(0..) in the end station
1107 ch1 = 2 * endStation;
1108 ch2 = ch1 + 1;
1109 // number of candidates to 0
1110 nbCan1Seg1Hit = 0;
1111 // Loop over chambers of the end station
1112 for (ch = ch2; ch >= ch1; ch--) {
1113 // linear extrapolation to chamber
1114 extrapHitForRec =
1115 BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor);
1116 // limits for the hit index in the loop
1117 iHitMin = fIndexOfFirstHitForRecPerChamber[ch];
1118 iHitMax = iHitMin + fNHitsForRecPerChamber[ch];
1119 // Loop over HitForRec's in the chamber
1120 for (iHit = iHitMin; iHit < iHitMax; iHit++) {
1121 // pointer to HitForRec
1122 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
1123 // test compatibility between current HitForRec and "extrapHitForRec"
04b5ea16 1124 // 2 because 2 quantities in chi2
a9e2aefa 1125 if ((hit->
1126 NormalizedChi2WithHitForRec(extrapHitForRec,
1127 fMaxSigma2Distance)) <= 2.0) {
1128 // both HitForRec's compatible:
1129 // make track candidate from begSegment and current HitForRec
1130 if (fPrintLevel >= 2)
1131 cout << "TrackCandidate with HitForRec " << iHit <<
1132 " in Chamber(0..) " << ch << endl;
1133 // flag for beginning segments in one track:
1134 // to be done in track constructor ????
1135 BegSegment->SetInTrack(kTRUE);
1136 recTrack = new ((*fRecTracksPtr)[fNRecTracks])
1137 AliMUONTrack(BegSegment, hit, this);
1138 // the right place to eliminate "double counting" ???? how ????
1139 fNRecTracks++;
1140 if (fPrintLevel >= 10) recTrack->RecursiveDump();
1141 // increment number of track candidates
1142 nbCan1Seg1Hit++;
1143 }
1144 } // for (iHit = iHitMin;...
1145 delete extrapHitForRec;
1146 } // for (ch = ch2;...
1147 return nbCan1Seg1Hit;
1148}
1149
1150 //__________________________________________________________________________
1151void AliMUONEventReconstructor::MakeTrackCandidates(void)
1152{
1153 // To make track candidates
1154 // with at least 3 aligned points in stations(1..) 4 and 5
1155 // (two Segment's or one Segment and one HitForRec)
1156 Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg;
1157 AliMUONSegment *begSegment;
1158 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl;
1159 // Loop over stations(1..) 5 and 4 for the beginning segment
1160 for (begStation = 4; begStation > 2; begStation--) {
1161 // Loop over segments in the beginning station
1162 for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) {
1163 // pointer to segment
1164 begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]);
1165 if (fPrintLevel >= 2)
1166 cout << "look for TrackCandidate's with Segment " << iBegSegment <<
1167 " in Station(0..) " << begStation << endl;
1168 // Look for track candidates with two segments,
1169 // "begSegment" and all compatible segments in other station.
1170 // Only for beginning station(1..) 5
1171 // because candidates with 2 segments have to looked for only once.
1172 if (begStation == 4)
1173 nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment);
956019b6 1174 // Look for track candidates with one segment and one point,
a9e2aefa 1175 // "begSegment" and all compatible HitForRec's in other station.
1176 // Only if "begSegment" does not belong already to a track candidate.
1177 // Is that a too strong condition ????
1178 if (!(begSegment->GetInTrack()))
1179 nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment);
1180 } // for (iBegSegment = 0;...
1181 } // for (begStation = 4;...
1182 return;
1183}
1184
1185 //__________________________________________________________________________
1186void AliMUONEventReconstructor::FollowTracks(void)
1187{
1188 // Follow tracks in stations(1..) 3, 2 and 1
04b5ea16 1189 // too long: should be made more modular !!!!
d0bfce8d 1190 AliMUONHitForRec *bestHit, *extrapHit, *extrapCorrHit, *hit;
1191 AliMUONSegment *bestSegment, *extrapSegment, *extrapCorrSegment, *segment;
04b5ea16 1192 AliMUONTrack *track, *nextTrack;
1193 AliMUONTrackParam *trackParam1, trackParam[2], trackParamVertex;
ecfa008b 1194 // -1 to avoid compilation warnings
1195 Int_t ch = -1, chInStation, chBestHit = -1, iHit, iSegment, station, trackIndex;
04b5ea16 1196 Double_t bestChi2, chi2, dZ1, dZ2, dZ3, maxSigma2Distance, mcsFactor;
d0bfce8d 1197 Double_t bendingMomentum, chi2Norm = 0.;
9cbdf048 1198 AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ????
04b5ea16 1199 // local maxSigma2Distance, for easy increase in testing
1200 maxSigma2Distance = fMaxSigma2Distance;
a9e2aefa 1201 if (fPrintLevel >= 2)
1202 cout << "enter FollowTracks" << endl;
1203 // Loop over track candidates
04b5ea16 1204 track = (AliMUONTrack*) fRecTracksPtr->First();
1205 trackIndex = -1;
1206 while (track) {
1207 // Follow function for each track candidate ????
1208 trackIndex++;
1209 nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track); // prepare next track
a9e2aefa 1210 if (fPrintLevel >= 2)
1211 cout << "FollowTracks: track candidate(0..): " << trackIndex << endl;
956019b6 1212 // Fit track candidate
1213 track->SetFitMCS(0); // without multiple Coulomb scattering
1214 track->SetFitNParam(3); // with 3 parameters (X = Y = 0)
1215 track->SetFitStart(0); // from parameters at vertex
1216 track->Fit();
a9e2aefa 1217 if (fPrintLevel >= 10) {
1218 cout << "FollowTracks: track candidate(0..): " << trackIndex
956019b6 1219 << " after fit in stations(0..) 3 and 4" << endl;
a9e2aefa 1220 track->RecursiveDump();
1221 }
1222 // Loop over stations(1..) 3, 2 and 1
04b5ea16 1223 // something SPECIAL for stations 2 and 1 for majority 3 coincidence ????
1224 // otherwise: majority coincidence 2 !!!!
a9e2aefa 1225 for (station = 2; station >= 0; station--) {
1226 // Track parameters at first track hit (smallest Z)
1227 trackParam1 = ((AliMUONTrackHit*)
1228 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1229 // extrapolation to station
1230 trackParam1->ExtrapToStation(station, trackParam);
79e1e601 1231 extrapSegment = new AliMUONSegment(); // empty segment
d0bfce8d 1232 extrapCorrSegment = new AliMUONSegment(); // empty corrected segment
a9e2aefa 1233 // multiple scattering factor corresponding to one chamber
1234 // and momentum in bending plane (not total)
1235 mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum();
1236 mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor;
1237 // Z difference from previous station
9cbdf048 1238 dZ1 = (&(pMUON->Chamber(2 * station)))->Z() -
1239 (&(pMUON->Chamber(2 * station + 2)))->Z();
a9e2aefa 1240 // Z difference between the two previous stations
9cbdf048 1241 dZ2 = (&(pMUON->Chamber(2 * station + 2)))->Z() -
1242 (&(pMUON->Chamber(2 * station + 4)))->Z();
04b5ea16 1243 // Z difference between the two chambers in the previous station
1244 dZ3 = (&(pMUON->Chamber(2 * station)))->Z() -
1245 (&(pMUON->Chamber(2 * station + 1)))->Z();
1246 extrapSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1247 extrapSegment->
1248 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1249 extrapSegment->UpdateFromStationTrackParam
1250 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1251 trackParam1->GetInverseBendingMomentum());
d0bfce8d 1252 // same thing for corrected segment
1253 // better to use copy constructor, after checking that it works properly !!!!
1254 extrapCorrSegment->SetBendingCoorReso2(fBendingResolution * fBendingResolution);
1255 extrapCorrSegment->
1256 SetNonBendingCoorReso2(fNonBendingResolution * fNonBendingResolution);
1257 extrapCorrSegment->UpdateFromStationTrackParam
1258 (trackParam, mcsFactor, dZ1, dZ2, dZ3, station,
1259 trackParam1->GetInverseBendingMomentum());
a9e2aefa 1260 bestChi2 = 5.0;
1261 bestSegment = NULL;
1262 if (fPrintLevel >= 10) {
1263 cout << "FollowTracks: track candidate(0..): " << trackIndex
1264 << " Look for segment in station(0..): " << station << endl;
1265 }
1266 // Loop over segments in station
1267 for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) {
1268 // Look for best compatible Segment in station
1269 // should consider all possibilities ????
1270 // multiple scattering ????
1271 // separation in 2 functions: Segment and HitForRec ????
1272 segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]);
d0bfce8d 1273 // correction of corrected segment (fBendingCoor and fNonBendingCoor)
1274 // according to real Z value of "segment" and slopes of "extrapSegment"
1275 extrapCorrSegment->
1276 SetBendingCoor(extrapSegment->GetBendingCoor() +
1277 extrapSegment->GetBendingSlope() *
1278 (segment->GetHitForRec1()->GetZ() -
1279 (&(pMUON->Chamber(2 * station)))->Z()));
1280 extrapCorrSegment->
1281 SetNonBendingCoor(extrapSegment->GetNonBendingCoor() +
1282 extrapSegment->GetNonBendingSlope() *
1283 (segment->GetHitForRec1()->GetZ() -
1284 (&(pMUON->Chamber(2 * station)))->Z()));
1285 chi2 = segment->
1286 NormalizedChi2WithSegment(extrapCorrSegment, maxSigma2Distance);
a9e2aefa 1287 if (chi2 < bestChi2) {
1288 // update best Chi2 and Segment if better found
1289 bestSegment = segment;
1290 bestChi2 = chi2;
1291 }
1292 }
1293 if (bestSegment) {
1294 // best segment found: add it to track candidate
1295 track->AddSegment(bestSegment);
1296 // set track parameters at these two TrakHit's
1297 track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0]));
1298 track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1]));
1299 if (fPrintLevel >= 10) {
1300 cout << "FollowTracks: track candidate(0..): " << trackIndex
1301 << " Added segment in station(0..): " << station << endl;
1302 track->RecursiveDump();
1303 }
1304 }
1305 else {
1306 // No best segment found:
1307 // Look for best compatible HitForRec in station:
1308 // should consider all possibilities ????
1309 // multiple scattering ???? do about like for extrapSegment !!!!
79e1e601 1310 extrapHit = new AliMUONHitForRec(); // empty hit
d0bfce8d 1311 extrapCorrHit = new AliMUONHitForRec(); // empty corrected hit
a9e2aefa 1312 bestChi2 = 3.0;
1313 bestHit = NULL;
1314 if (fPrintLevel >= 10) {
1315 cout << "FollowTracks: track candidate(0..): " << trackIndex
1316 << " Segment not found, look for hit in station(0..): " << station
1317 << endl;
1318 }
1319 // Loop over chambers of the station
d82671a0 1320 for (chInStation = 0; chInStation < 2; chInStation++) {
a9e2aefa 1321 // coordinates of extrapolated hit
d82671a0 1322 extrapHit->
1323 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1324 extrapHit->
1325 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
a9e2aefa 1326 // resolutions from "extrapSegment"
1327 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1328 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
d0bfce8d 1329 // same things for corrected hit
1330 // better to use copy constructor, after checking that it works properly !!!!
1331 extrapCorrHit->
1332 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor());
1333 extrapCorrHit->
1334 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor());
1335 extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2());
1336 extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2());
a9e2aefa 1337 // Loop over hits in the chamber
956019b6 1338 ch = 2 * station + chInStation;
a9e2aefa 1339 for (iHit = fIndexOfFirstHitForRecPerChamber[ch];
1340 iHit < fIndexOfFirstHitForRecPerChamber[ch] +
1341 fNHitsForRecPerChamber[ch];
1342 iHit++) {
1343 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]);
d0bfce8d 1344 // correction of corrected hit (fBendingCoor and fNonBendingCoor)
1345 // according to real Z value of "hit" and slopes of right "trackParam"
1346 extrapCorrHit->
1347 SetBendingCoor((&(trackParam[chInStation]))->GetBendingCoor() +
1348 (&(trackParam[chInStation]))->GetBendingSlope() *
1349 (hit->GetZ() -
1350 (&(trackParam[chInStation]))->GetZ()));
1351 extrapCorrHit->
1352 SetNonBendingCoor((&(trackParam[chInStation]))->GetNonBendingCoor() +
1353 (&(trackParam[chInStation]))->GetNonBendingSlope() *
1354 (hit->GetZ() -
1355 (&(trackParam[chInStation]))->GetZ()));
a9e2aefa 1356 // condition for hit not already in segment ????
1357 chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance);
1358 if (chi2 < bestChi2) {
1359 // update best Chi2 and HitForRec if better found
1360 bestHit = hit;
1361 bestChi2 = chi2;
d82671a0 1362 chBestHit = chInStation;
a9e2aefa 1363 }
1364 }
1365 }
1366 if (bestHit) {
1367 // best hit found: add it to track candidate
1368 track->AddHitForRec(bestHit);
956019b6 1369 // set track parameters at this TrackHit
a9e2aefa 1370 track->SetTrackParamAtHit(track->GetNTrackHits() - 1,
1371 &(trackParam[chBestHit]));
1372 if (fPrintLevel >= 10) {
1373 cout << "FollowTracks: track candidate(0..): " << trackIndex
1374 << " Added hit in station(0..): " << station << endl;
1375 track->RecursiveDump();
1376 }
1377 }
1378 else {
8429a5e4 1379 // Remove current track candidate
1380 // and corresponding TrackHit's, ...
1381 track->Remove();
04b5ea16 1382 delete extrapSegment;
d0bfce8d 1383 delete extrapCorrSegment;
1384 delete extrapHit;
1385 delete extrapCorrHit;
a9e2aefa 1386 break; // stop the search for this candidate:
1387 // exit from the loop over station
1388 }
d0bfce8d 1389 delete extrapHit;
1390 delete extrapCorrHit;
a9e2aefa 1391 }
04b5ea16 1392 delete extrapSegment;
d0bfce8d 1393 delete extrapCorrSegment;
a9e2aefa 1394 // Sort track hits according to increasing Z
1395 track->GetTrackHitsPtr()->Sort();
1396 // Update track parameters at first track hit (smallest Z)
1397 trackParam1 = ((AliMUONTrackHit*)
1398 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
d0bfce8d 1399 bendingMomentum = 0.;
1400 if (TMath::Abs(trackParam1->GetInverseBendingMomentum()) > 0.)
1401 bendingMomentum = TMath::Abs(1/(trackParam1->GetInverseBendingMomentum()));
1402 // Track removed if bendingMomentum not in window [min, max]
1403 if ((bendingMomentum < fMinBendingMomentum) || (bendingMomentum > fMaxBendingMomentum)) {
1404 track->Remove();
1405 break; // stop the search for this candidate:
1406 // exit from the loop over station
1407 }
956019b6 1408 // Track fit
04b5ea16 1409 // with multiple Coulomb scattering if all stations
1410 if (station == 0) track->SetFitMCS(1);
956019b6 1411 // without multiple Coulomb scattering if not all stations
04b5ea16 1412 else track->SetFitMCS(0);
956019b6 1413 track->SetFitNParam(5); // with 5 parameters (momentum and position)
1414 track->SetFitStart(1); // from parameters at first hit
1415 track->Fit();
d0bfce8d 1416 Double_t numberOfDegFree = (2.0 * track->GetNTrackHits() - 5);
1417 if (numberOfDegFree > 0) {
1418 chi2Norm = track->GetFitFMin() / numberOfDegFree;
1419 } else {
1420 chi2Norm = 1.e10;
1421 }
1422 // Track removed if normalized chi2 too high
1423 if (chi2Norm > fMaxChi2) {
1424 track->Remove();
1425 break; // stop the search for this candidate:
1426 // exit from the loop over station
1427 }
a9e2aefa 1428 if (fPrintLevel >= 10) {
1429 cout << "FollowTracks: track candidate(0..): " << trackIndex
1430 << " after fit from station(0..): " << station << " to 4" << endl;
1431 track->RecursiveDump();
1432 }
04b5ea16 1433 // Track extrapolation to the vertex through the absorber (Branson)
956019b6 1434 // after going through the first station
04b5ea16 1435 if (station == 0) {
1436 trackParamVertex = *trackParam1;
1437 (&trackParamVertex)->ExtrapToVertex();
1438 track->SetTrackParamAtVertex(&trackParamVertex);
6ae236ee 1439 if (fPrintLevel >= 1) {
1440 cout << "FollowTracks: track candidate(0..): " << trackIndex
1441 << " after extrapolation to vertex" << endl;
1442 track->RecursiveDump();
1443 }
04b5ea16 1444 }
a9e2aefa 1445 } // for (station = 2;...
04b5ea16 1446 // go really to next track
1447 track = nextTrack;
1448 } // while (track)
1449 // Compression of track array (necessary after Remove ????)
1450 fRecTracksPtr->Compress();
1451 return;
1452}
1453
1454 //__________________________________________________________________________
8429a5e4 1455void AliMUONEventReconstructor::RemoveDoubleTracks(void)
1456{
1457 // To remove double tracks.
1458 // Tracks are considered identical
1459 // if they have at least half of their hits in common.
1460 // Among two identical tracks, one keeps the track with the larger number of hits
1461 // or, if these numbers are equal, the track with the minimum Chi2.
1462 AliMUONTrack *track1, *track2, *trackToRemove;
1463 Bool_t identicalTracks;
1464 Int_t hitsInCommon, nHits1, nHits2;
1465 identicalTracks = kTRUE;
1466 while (identicalTracks) {
1467 identicalTracks = kFALSE;
1468 // Loop over first track of the pair
1469 track1 = (AliMUONTrack*) fRecTracksPtr->First();
1470 while (track1 && (!identicalTracks)) {
1471 nHits1 = track1->GetNTrackHits();
1472 // Loop over second track of the pair
1473 track2 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1474 while (track2 && (!identicalTracks)) {
1475 nHits2 = track2->GetNTrackHits();
1476 // number of hits in common between two tracks
1477 hitsInCommon = track1->HitsInCommon(track2);
1478 // check for identical tracks
1479 if ((4 * hitsInCommon) >= (nHits1 + nHits2)) {
1480 identicalTracks = kTRUE;
1481 // decide which track to remove
1482 if (nHits1 > nHits2) trackToRemove = track2;
1483 else if (nHits1 < nHits2) trackToRemove = track1;
1484 else if ((track1->GetFitFMin()) < (track2->GetFitFMin()))
1485 trackToRemove = track2;
1486 else trackToRemove = track1;
1487 // remove it
1488 trackToRemove->Remove();
1489 }
1490 track2 = (AliMUONTrack*) fRecTracksPtr->After(track2);
1491 } // track2
1492 track1 = (AliMUONTrack*) fRecTracksPtr->After(track1);
1493 } // track1
1494 }
1495 return;
1496}
1497
1498 //__________________________________________________________________________
04b5ea16 1499void AliMUONEventReconstructor::EventDump(void)
1500{
1501 // Dump reconstructed event (track parameters at vertex and at first hit),
1502 // and the particle parameters
1503
1504 AliMUONTrack *track;
1505 AliMUONTrackParam *trackParam, *trackParam1;
04b5ea16 1506 Double_t bendingSlope, nonBendingSlope, pYZ;
1507 Double_t pX, pY, pZ, x, y, z, c;
1508 Int_t np, trackIndex, nTrackHits;
1509
1510 if (fPrintLevel >= 1) cout << "****** enter EventDump ******" << endl;
1511 if (fPrintLevel >= 1) {
1512 cout << " Number of Reconstructed tracks :" << fNRecTracks << endl;
1513 }
1514 fRecTracksPtr->Compress(); // for simple loop without "Next" since no hole
1515 // Loop over reconstructed tracks
1516 for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) {
83dbc640 1517 if (fTrackMethod != 1) continue; //AZ - skip the rest for now
04b5ea16 1518 if (fPrintLevel >= 1)
1519 cout << " track number: " << trackIndex << endl;
1520 // function for each track for modularity ????
1521 track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]);
1522 nTrackHits = track->GetNTrackHits();
1523 if (fPrintLevel >= 1)
1524 cout << " number of track hits: " << nTrackHits << endl;
1525 // track parameters at Vertex
1526 trackParam = track->GetTrackParamAtVertex();
1527 x = trackParam->GetNonBendingCoor();
1528 y = trackParam->GetBendingCoor();
1529 z = trackParam->GetZ();
1530 bendingSlope = trackParam->GetBendingSlope();
1531 nonBendingSlope = trackParam->GetNonBendingSlope();
1532 pYZ = 1/TMath::Abs(trackParam->GetInverseBendingMomentum());
1533 pZ = pYZ/TMath::Sqrt(1+bendingSlope*bendingSlope);
1534 pX = pZ * nonBendingSlope;
1535 pY = pZ * bendingSlope;
1536 c = TMath::Sign(1.0, trackParam->GetInverseBendingMomentum());
1537 if (fPrintLevel >= 1)
1538 printf(" track parameters at Vertex z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1539 z, x, y, pX, pY, pZ, c);
1540
1541 // track parameters at first hit
1542 trackParam1 = ((AliMUONTrackHit*)
1543 (track->GetTrackHitsPtr()->First()))->GetTrackParam();
1544 x = trackParam1->GetNonBendingCoor();
1545 y = trackParam1->GetBendingCoor();
1546 z = trackParam1->GetZ();
1547 bendingSlope = trackParam1->GetBendingSlope();
1548 nonBendingSlope = trackParam1->GetNonBendingSlope();
1549 pYZ = 1/TMath::Abs(trackParam1->GetInverseBendingMomentum());
1550 pZ = pYZ/TMath::Sqrt(1.0 + bendingSlope * bendingSlope);
1551 pX = pZ * nonBendingSlope;
1552 pY = pZ * bendingSlope;
1553 c = TMath::Sign(1.0, trackParam1->GetInverseBendingMomentum());
1554 if (fPrintLevel >= 1)
1555 printf(" track parameters at z= %f: X= %f Y= %f pX= %f pY= %f pZ= %f c= %f\n",
1556 z, x, y, pX, pY, pZ, c);
1557 }
1558 // informations about generated particles
5d12ce38 1559 np = gAlice->GetMCApp()->GetNtrack();
04b5ea16 1560 printf(" **** number of generated particles: %d \n", np);
1561
88cb7938 1562// for (Int_t iPart = 0; iPart < np; iPart++) {
1563// p = gAlice->Particle(iPart);
1564// printf(" particle %d: type= %d px= %f py= %f pz= %f pdg= %d\n",
1565// iPart, p->GetPdgCode(), p->Px(), p->Py(), p->Pz(), p->GetPdgCode());
1566// }
a9e2aefa 1567 return;
1568}
1569
276c44b7 1570
1571//__________________________________________________________________________
1572void AliMUONEventReconstructor::EventDumpTrigger(void)
1573{
1574 // Dump reconstructed trigger event
1575 // and the particle parameters
1576
1577 AliMUONTriggerTrack *triggertrack;
1578 Int_t trackIndex;
1579
1580 if (fPrintLevel >= 1) cout << "****** enter EventDumpTrigger ******" << endl;
1581 if (fPrintLevel >= 1) {
1582 cout << " Number of Reconstructed tracks :" << fNRecTriggerTracks << endl;
1583 }
1584 // Loop over reconstructed tracks
1585 for (trackIndex = 0; trackIndex < fNRecTriggerTracks; trackIndex++) {
1586 triggertrack = (AliMUONTriggerTrack*) ((*fRecTriggerTracksPtr)[trackIndex]);
1587 printf(" trigger track number %i x11=%f y11=%f thetax=%f thetay=%f \n",
1588 trackIndex,
1589 triggertrack->GetX11(),triggertrack->GetY11(),
1590 triggertrack->GetThetax(),triggertrack->GetThetay());
1591 }
1592}
1593
1594//__________________________________________________________________________
c7ba256d 1595void AliMUONEventReconstructor::FillEvent()
1596{
1597// Create a new AliMUONRecoEvent, fill its track list, then add it as a
1598// leaf in the Event branch of TreeRecoEvent tree
1599 cout << "Enter FillEvent() ...\n";
1600
1601 if (!fRecoEvent) {
1602 fRecoEvent = new AliMUONRecoEvent();
1603 } else {
1604 fRecoEvent->Clear();
1605 }
1606 //save current directory
1607 TDirectory *current = gDirectory;
1608 if (!fTreeFile) fTreeFile = new TFile("tree_reco.root", "RECREATE");
1609 if (!fEventTree) fEventTree = new TTree("TreeRecoEvent", "MUON reconstructed events");
83dbc640 1610 //AZif (fRecoEvent->MakeDumpTracks(fRecTracksPtr)) {
1611 if (fRecoEvent->MakeDumpTracks(fMuons, fRecTracksPtr, this)) { //AZ
c7ba256d 1612 if (fPrintLevel > 1) fRecoEvent->EventInfo();
1613 TBranch *branch = fEventTree->GetBranch("Event");
d0f40f23 1614 if (!branch) branch = fEventTree->Branch("Event", "AliMUONRecoEvent", &fRecoEvent, 64000);
c7ba256d 1615 branch->SetAutoDelete();
1616 fTreeFile->cd();
1617 fEventTree->Fill();
1618 fTreeFile->Write();
1619 }
1620 // restore directory
1621 current->cd();
1622}
83dbc640 1623
1624//__________________________________________________________________________
1625void AliMUONEventReconstructor::MakeTrackCandidatesK(void)
1626{
1627 // To make initial tracks for Kalman filter from the list of segments
1628 Int_t istat, iseg;
1629 AliMUONSegment *segment;
1630 AliMUONTrackK *trackK;
1631
1632 if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesK" << endl;
1633 // Reset the TClonesArray of reconstructed tracks
1634 if (fRecTracksPtr) fRecTracksPtr->Delete();
1635 // Delete in order that the Track destructors are called,
1636 // hence the space for the TClonesArray of pointers to TrackHit's is freed
1637 fNRecTracks = 0;
1638
1639 AliMUONTrackK a(this, fHitsForRecPtr); // bad idea ???
1640 // Loop over stations(1...) 5 and 4
1641 for (istat=4; istat>=3; istat--) {
1642 // Loop over segments in the station
1643 for (iseg=0; iseg<fNSegments[istat]; iseg++) {
1644 // Transform segments to tracks and evaluate covariance matrix
1645 segment = (AliMUONSegment*) ((*fSegmentsPtr[istat])[iseg]);
1646 trackK = new ((*fRecTracksPtr)[fNRecTracks]) AliMUONTrackK(segment);
1647 fNRecTracks++;
1648 } // for (iseg=0;...)
1649 } // for (istat=4;...)
1650 return;
1651}
1652
1653//__________________________________________________________________________
1654void AliMUONEventReconstructor::FollowTracksK(void)
1655{
1656 // Follow tracks using Kalman filter
1657 Bool_t Ok;
1658 Int_t icand, ichamBeg, ichamEnd, chamBits;
1659 Double_t zDipole1, zDipole2;
1660 AliMUONTrackK *trackK;
1661 AliMUONHitForRec *hit;
1662 AliMUONRawCluster *clus;
1663 TClonesArray *rawclusters;
1664 AliMUON *pMUON;
1665 clus = 0; rawclusters = 0;
1666
1667 zDipole1 = GetSimpleBPosition() - GetSimpleBLength()/2;
1668 zDipole2 = zDipole1 + GetSimpleBLength();
1669
1670 // Print hits
1671 pMUON = (AliMUON*) gAlice->GetModule("MUON");
1672 for (Int_t i1=0; i1<fNHitsForRec; i1++) {
1673 hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[i1]);
1674 //if (hit->GetTHTrack() > 1 || hit->GetGeantSignal() == 0) continue;
1675 /*
1676 cout << " Hit #" << hit->GetChamberNumber() << " ";
1677 cout << hit->GetBendingCoor() << " ";
1678 cout << hit->GetNonBendingCoor() << " ";
1679 cout << hit->GetZ() << " ";
1680 cout << hit->GetGeantSignal() << " ";
1681 cout << hit->GetTHTrack() << endl;
1682 */
1683 /*
1684 printf(" Hit # %d %10.4f %10.4f %10.4f",
1685 hit->GetChamberNumber(), hit->GetBendingCoor(),
1686 hit->GetNonBendingCoor(), hit->GetZ());
1687 if (fRecGeantHits) {
1688 // from GEANT hits
1689 printf(" %3d %3d \n", hit->GetGeantSignal(), hit->GetTHTrack());
1690 } else {
1691 // from raw clusters
1692 rawclusters = pMUON->RawClustAddress(hit->GetChamberNumber());
1693 clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(hit->
1694 GetHitNumber());
1695 printf("%3d", clus->fTracks[1]-1);
1696 if (clus->fTracks[2] != 0) printf("%3d \n", clus->fTracks[2]-1);
1697 else printf("\n");
1698 }
1699 */
1700 }
1701
1702 icand = -1;
1703 Int_t nSeeds = fNRecTracks; // starting number of seeds
1704 // Loop over track candidates
1705 while (icand < fNRecTracks-1) {
1706 icand ++;
1707 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1708
1709 // Discard candidate which will produce the double track
1710 if (icand > 0) {
1711 Ok = CheckCandidateK(icand,nSeeds);
1712 if (!Ok) {
1713 //trackK->SetRecover(-1); // mark candidate to be removed
1714 //continue;
1715 }
1716 }
1717
1718 Ok = kTRUE;
1719 if (trackK->GetRecover() == 0) hit = (AliMUONHitForRec*)
1720 trackK->GetHitOnTrack()->Last(); // last hit
1721 else hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[1]; // 2'nd hit
1722 ichamBeg = hit->GetChamberNumber();
1723 ichamEnd = 0;
1724 // Check propagation direction
1725 if (trackK->GetTrackDir() > 0) {
1726 ichamEnd = 9; // forward propagation
1727 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1728 if (Ok) {
1729 ichamBeg = ichamEnd;
1730 ichamEnd = 6; // backward propagation
1731 // Change weight matrix and zero fChi2 for backpropagation
1732 trackK->StartBack();
1733 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1734 ichamBeg = ichamEnd;
1735 ichamEnd = 0;
1736 }
1737 } else {
1738 if (trackK->GetBPFlag()) {
1739 // backpropagation
1740 ichamEnd = 6; // backward propagation
1741 // Change weight matrix and zero fChi2 for backpropagation
1742 trackK->StartBack();
1743 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kTRUE,zDipole1,zDipole2);
1744 ichamBeg = ichamEnd;
1745 ichamEnd = 0;
1746 }
1747 }
1748
1749 if (Ok) {
1750 trackK->SetTrackDir(-1);
1751 trackK->SetBPFlag(kFALSE);
1752 Ok = trackK->KalmanFilter(ichamBeg,ichamEnd,kFALSE,zDipole1,zDipole2);
1753 }
1754 if (Ok) trackK->SetTrackQuality(0); // compute "track quality"
1755 else trackK->SetRecover(-1); // mark candidate to be removed
1756
1757 // Majority 3 of 4 in first 2 stations
1758 chamBits = 0;
1759 for (Int_t i=0; i<trackK->GetNTrackHits(); i++) {
1760 hit = (AliMUONHitForRec*) (*trackK->GetHitOnTrack())[i];
1761 chamBits |= BIT(hit->GetChamberNumber()-1);
1762 }
1763 //if (!((chamBits&3)==3 || (chamBits>>2&3)==3)) trackK->SetRecover(-1);
1764 //mark candidate to be removed
1765 } // while
1766
1767 for (Int_t i=0; i<fNRecTracks; i++) {
1768 trackK = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1769 if (trackK->GetRecover() < 0) fRecTracksPtr->RemoveAt(i);
1770 }
1771
1772 // Compress TClonesArray
1773 fRecTracksPtr->Compress();
1774 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1775 return;
1776}
1777
1778//__________________________________________________________________________
1779Bool_t AliMUONEventReconstructor::CheckCandidateK(Int_t icand, Int_t nSeeds)
1780{
1781 // Discards track candidate if it will produce the double track (having
1782 // the same seed segment hits as hits of a good track found before)
1783 AliMUONTrackK *track1, *track2;
1784 AliMUONHitForRec *hit1, *hit2, *hit;
1785
1786 track1 = (AliMUONTrackK*) ((*fRecTracksPtr)[icand]);
1787 hit1 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[0]; // 1'st hit
1788 hit2 = (AliMUONHitForRec*) (*track1->GetHitOnTrack())[1]; // 2'nd hit
1789
1790 for (Int_t i=0; i<icand; i++) {
1791 track2 = (AliMUONTrackK*) ((*fRecTracksPtr)[i]);
1792 //if (track2->GetRecover() < 0) continue;
1793 if (track2->GetRecover() < 0 && icand >= nSeeds) continue;
1794
1795 if (track1->GetStartSegment() == track2->GetStartSegment()) {
1796 return kFALSE;
1797 } else {
1798 Int_t nSame = 0;
1799 for (Int_t j=0; j<track2->GetNTrackHits(); j++) {
1800 hit = (AliMUONHitForRec*) (*track2->GetHitOnTrack())[j];
1801 if (hit == hit1 || hit == hit2) {
1802 nSame++;
1803 if (nSame == 2) return kFALSE;
1804 }
1805 } // for (Int_t j=0;
1806 }
1807 } // for (Int_t i=0;
1808 return kTRUE;
1809}
1810
1811//__________________________________________________________________________
1812void AliMUONEventReconstructor::RemoveDoubleTracksK(void)
1813{
1814 // Removes double tracks (sharing more than half of their hits). Keeps
1815 // the track with higher quality
1816 AliMUONTrackK *track1, *track2, *trackToKill;
1817
1818 // Sort tracks according to their quality
1819 fRecTracksPtr->Sort();
1820
1821 // Loop over first track of the pair
1822 track1 = (AliMUONTrackK*) fRecTracksPtr->First();
1823 while (track1) {
1824 // Loop over second track of the pair
1825 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1826 while (track2) {
1827 // Check whether or not to keep track2
1828 if (!track2->KeepTrack(track1)) {
1829 cout << " Killed track: " << 1/(*track2->GetTrackParameters())(4,0) <<
1830 " " << track2->GetTrackQuality() << endl;
1831 trackToKill = track2;
1832 track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1833 trackToKill->Kill();
1834 fRecTracksPtr->Compress();
1835 } else track2 = (AliMUONTrackK*) fRecTracksPtr->After(track2);
1836 } // track2
1837 track1 = (AliMUONTrackK*) fRecTracksPtr->After(track1);
1838 } // track1
1839
1840 fNRecTracks = fRecTracksPtr->GetEntriesFast();
1841 cout << " Number of Kalman tracks: " << fNRecTracks << endl;
1842}
1843
1844//__________________________________________________________________________
1845void AliMUONEventReconstructor::GoToVertex(void)
1846{
1847 // Propagates track to the vertex thru absorber
1848 // (using Branson correction for now)
1849
1850 Double_t zVertex;
1851 zVertex = 0;
1852 for (Int_t i=0; i<fNRecTracks; i++) {
1853 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->Branson();
1854 //((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToZ(zVertex); // w/out absorber
1855 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->SetTrackQuality(1); // compute Chi2
1856 ((AliMUONTrackK*)(*fRecTracksPtr)[i])->GoToVertex(); // with absorber
1857 }
1858}