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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 | ||
16 | /* | |
17 | $Log$ | |
18 | Revision 1.1.2.4 2000/06/12 08:00:07 morsch | |
19 | Dummy streamer to solve CINT compilation problem (to be investigated !) | |
20 | ||
21 | Revision 1.1.2.3 2000/06/09 20:59:57 morsch | |
22 | Make includes consistent with new file structure. | |
23 | ||
24 | Revision 1.1.2.2 2000/06/09 12:58:05 gosset | |
25 | Removed comment beginnings in Log sections of .cxx files | |
26 | Suppressed most violations of coding rules | |
27 | ||
28 | Revision 1.1.2.1 2000/06/07 14:44:53 gosset | |
29 | Addition of files for track reconstruction in C++ | |
30 | */ | |
31 | ||
32 | //__________________________________________________________________________ | |
33 | // | |
34 | // MUON event reconstructor in ALICE | |
35 | // | |
36 | // This class contains as data: | |
37 | // * the parameters for the event reconstruction | |
38 | // * a pointer to the array of hits to be reconstructed (the event) | |
39 | // * a pointer to the array of segments made with these hits inside each station | |
40 | // * a pointer to the array of reconstructed tracks | |
41 | // | |
42 | // It contains as methods, among others: | |
43 | // * MakeEventToBeReconstructed to build the array of hits to be reconstructed | |
44 | // * MakeSegments to build the segments | |
45 | // * MakeTracks to build the tracks | |
46 | //__________________________________________________________________________ | |
47 | ||
48 | #include <iostream.h> | |
49 | ||
50 | #include <TRandom.h> | |
51 | #include <TFile.h> | |
52 | ||
53 | #include "AliCallf77.h" | |
54 | #include "AliMUONEventReconstructor.h" | |
55 | #include "AliMUON.h" | |
56 | #include "AliMUONHitForRec.h" | |
57 | #include "AliMUONSegment.h" | |
58 | #include "AliMUONHit.h" | |
59 | #include "AliMUONRawCluster.h" | |
60 | #include "AliMUONTrack.h" | |
61 | #include "AliMUONChamber.h" | |
62 | #include "AliMUONTrackHit.h" | |
63 | #include "AliRun.h" | |
64 | ||
65 | #ifndef WIN32 | |
66 | # define initfield initfield_ | |
67 | # define reco_gufld reco_gufld_ | |
68 | #else | |
69 | # define initfield INITFIELD | |
70 | # define reco_gufld RECO_GUFLD | |
71 | #endif | |
72 | ||
73 | extern "C" | |
74 | { | |
75 | void type_of_call initfield(); | |
76 | void type_of_call reco_gufld(Double_t *Coor, Double_t *Field); | |
77 | } | |
78 | ||
79 | //************* Defaults parameters for reconstruction | |
80 | static const Double_t DefaultMinBendingMomentum = 3.0; | |
81 | static const Double_t DefaultMaxSigma2Distance = 16.0; | |
82 | static const Double_t DefaultBendingResolution = 0.01; | |
83 | static const Double_t DefaultNonBendingResolution = 0.144; | |
84 | static const Double_t DefaultChamberThicknessInX0 = 0.03; | |
85 | // Simple magnetic field: | |
86 | // Value taken from macro MUONtracking.C: 0.7 T, hence 7 kG | |
87 | // Length and Position from reco_muon.F, with opposite sign: | |
88 | // Length = ZMAGEND-ZCOIL | |
89 | // Position = (ZMAGEND+ZCOIL)/2 | |
90 | // to be ajusted differently from real magnetic field ???? | |
91 | static const Double_t DefaultSimpleBValue = 7.0; | |
92 | static const Double_t DefaultSimpleBLength = 428.0; | |
93 | static const Double_t DefaultSimpleBPosition = 1019.0; | |
94 | static const Int_t DefaultRecGeantHits = 0; | |
95 | static const Double_t DefaultEfficiency = 0.95; | |
96 | ||
97 | static const Int_t DefaultPrintLevel = 0; | |
98 | ||
99 | ClassImp(AliMUONEventReconstructor) // Class implementation in ROOT context | |
100 | ||
101 | //__________________________________________________________________________ | |
102 | AliMUONEventReconstructor::AliMUONEventReconstructor(void) | |
103 | { | |
104 | // Constructor for class AliMUONEventReconstructor | |
105 | SetReconstructionParametersToDefaults(); | |
106 | // Memory allocation for the TClonesArray of hits for reconstruction | |
107 | // Is 10000 the right size ???? | |
108 | fHitsForRecPtr = new TClonesArray("AliMUONHitForRec", 10000); | |
109 | fNHitsForRec = 0; // really needed or GetEntriesFast sufficient ???? | |
110 | // Memory allocation for the TClonesArray's of segments in stations | |
111 | // Is 2000 the right size ???? | |
112 | for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) { | |
113 | fSegmentsPtr[st] = new TClonesArray("AliMUONSegment", 2000); | |
114 | fNSegments[st] = 0; // really needed or GetEntriesFast sufficient ???? | |
115 | } | |
116 | // Memory allocation for the TClonesArray of reconstructed tracks | |
117 | // Is 10 the right size ???? | |
118 | fRecTracksPtr = new TClonesArray("AliMUONTrack", 10); | |
119 | fNRecTracks = 0; // really needed or GetEntriesFast sufficient ???? | |
120 | ||
121 | // Initialize magnetic field | |
122 | // using Fortran subroutine INITFIELD in "reco_muon.F". | |
123 | // Should rather use AliMagF ???? and remove prototyping ... | |
124 | initfield(); | |
125 | // Impression de quelques valeurs | |
126 | Double_t coor[3], field[3]; | |
127 | coor[0] = 50.0; | |
128 | coor[1] = 50.0; | |
129 | coor[2] = 950.0; | |
130 | reco_gufld(coor, field); | |
131 | cout << "coor: " << coor[0] << ", " << coor[1] << ", " << coor[2] << endl; | |
132 | cout << "field: " << field[0] << ", " << field[1] << ", " << field[2] << endl; | |
133 | coor[2] = -950.0; | |
134 | reco_gufld(coor, field); | |
135 | cout << "coor: " << coor[0] << ", " << coor[1] << ", " << coor[2] << endl; | |
136 | cout << "field: " << field[0] << ", " << field[1] << ", " << field[2] << endl; | |
137 | coor[2] = -950.0; | |
138 | ||
139 | if (fPrintLevel >= 0) { | |
140 | cout << "AliMUONEventReconstructor constructed with defaults" << endl; Dump();} | |
141 | return; | |
142 | } | |
143 | ||
144 | //__________________________________________________________________________ | |
145 | AliMUONEventReconstructor::~AliMUONEventReconstructor(void) | |
146 | { | |
147 | // Destructor for class AliMUONEventReconstructor | |
148 | delete fHitsForRecPtr; // Correct destruction of everything ???? or delete [] ???? | |
149 | for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) | |
150 | delete fSegmentsPtr[st]; // Correct destruction of everything ???? | |
151 | return; | |
152 | } | |
153 | ||
154 | //__________________________________________________________________________ | |
155 | void AliMUONEventReconstructor::SetReconstructionParametersToDefaults(void) | |
156 | { | |
157 | // Set reconstruction parameters to default values | |
158 | // Would be much more convenient with a structure (or class) ???? | |
159 | fMinBendingMomentum = DefaultMinBendingMomentum; | |
160 | fMaxSigma2Distance = DefaultMaxSigma2Distance; | |
161 | ||
162 | AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); | |
163 | // ******** Parameters for making HitsForRec | |
164 | // minimum radius, | |
165 | // like in TRACKF_STAT: | |
166 | // 2 degrees for stations 1 and 2, or ch(0...) from 0 to 3; | |
167 | // 30 cm for stations 3 to 5, or ch(0...) from 4 to 9 | |
168 | for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) { | |
169 | if (ch < 4) fRMin[ch] = TMath::Abs((&(MUON->Chamber(ch)))->Z()) * | |
170 | 2.0 * TMath::Pi() / 180.0; | |
171 | else fRMin[ch] = 30.0; | |
172 | } | |
173 | // maximum radius | |
174 | // like in TRACKF_STAT (10 degrees ????) | |
175 | fRMax[0] = fRMax[1] = 91.5; | |
176 | fRMax[2] = fRMax[3] = 122.5; | |
177 | fRMax[4] = fRMax[5] = 158.3; | |
178 | fRMax[6] = fRMax[7] = 260.0; | |
179 | fRMax[8] = fRMax[9] = 260.0; | |
180 | ||
181 | // ******** Parameters for making segments | |
182 | // should be parametrized ???? | |
183 | // according to interval between chambers in a station ???? | |
184 | // Maximum distance in non bending plane | |
185 | // 5 * 0.22 just to remember the way it was made in TRACKF_STAT | |
186 | // SIGCUT*DYMAX(IZ) | |
187 | for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) | |
188 | fSegmentMaxDistNonBending[st] = 5. * 0.22; | |
189 | // Maximum distance in bending plane | |
190 | // values from TRACKF_STAT corresponding to (J psi 20cm) | |
191 | fSegmentMaxDistBending[0] = 1.5; | |
192 | fSegmentMaxDistBending[1] = 1.5; | |
193 | fSegmentMaxDistBending[2] = 3.0; | |
194 | fSegmentMaxDistBending[3] = 6.0; | |
195 | fSegmentMaxDistBending[4] = 6.0; | |
196 | ||
197 | fBendingResolution = DefaultBendingResolution; | |
198 | fNonBendingResolution = DefaultNonBendingResolution; | |
199 | fChamberThicknessInX0 = DefaultChamberThicknessInX0; | |
200 | fSimpleBValue = DefaultSimpleBValue; | |
201 | fSimpleBLength = DefaultSimpleBLength; | |
202 | fSimpleBPosition = DefaultSimpleBPosition; | |
203 | fRecGeantHits = DefaultRecGeantHits; | |
204 | fEfficiency = DefaultEfficiency; | |
205 | fPrintLevel = DefaultPrintLevel; | |
206 | return; | |
207 | } | |
208 | ||
209 | //__________________________________________________________________________ | |
210 | Double_t AliMUONEventReconstructor::GetImpactParamFromBendingMomentum(Double_t BendingMomentum) | |
211 | { | |
212 | // Returns impact parameter at vertex in bending plane (cm), | |
213 | // from the signed bending momentum "BendingMomentum" in bending plane (GeV/c), | |
214 | // using simple values for dipole magnetic field. | |
215 | // The sign is the sign of the charge. | |
216 | return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition / | |
217 | BendingMomentum); | |
218 | } | |
219 | ||
220 | //__________________________________________________________________________ | |
221 | Double_t AliMUONEventReconstructor::GetBendingMomentumFromImpactParam(Double_t ImpactParam) | |
222 | { | |
223 | // Returns signed bending momentum in bending plane (GeV/c), | |
224 | // from the impact parameter "ImpactParam" at vertex in bending plane (cm), | |
225 | // using simple values for dipole magnetic field. | |
226 | // The sign is the sign of the charge. | |
227 | return (-0.0003 * fSimpleBValue * fSimpleBLength * fSimpleBPosition / | |
228 | ImpactParam); | |
229 | } | |
230 | ||
231 | //__________________________________________________________________________ | |
232 | void AliMUONEventReconstructor::SetBkgGeantFile(Text_t *BkgGeantFileName) | |
233 | { | |
234 | // Set background file ... for GEANT hits | |
235 | // Must be called after having loaded the firts signal event | |
236 | if (fPrintLevel >= 0) { | |
237 | cout << "Enter SetBkgGeantFile with BkgGeantFileName ``" | |
238 | << BkgGeantFileName << "''" << endl;} | |
239 | if (strlen(BkgGeantFileName)) { | |
240 | // BkgGeantFileName not empty: try to open the file | |
241 | if (fPrintLevel >= 2) {cout << "Before File(Bkg)" << endl; gDirectory->Dump();} | |
242 | fBkgGeantFile = new TFile(BkgGeantFileName); | |
243 | if (fPrintLevel >= 2) {cout << "After File(Bkg)" << endl; gDirectory->Dump();} | |
244 | if (fBkgGeantFile-> IsOpen()) { | |
245 | if (fPrintLevel >= 0) { | |
246 | cout << "Background for GEANT hits in file: ``" << BkgGeantFileName | |
247 | << "'' successfully opened" << endl;} | |
248 | } | |
249 | else { | |
250 | cout << "Background for GEANT hits in file: " << BkgGeantFileName << endl; | |
251 | cout << "NOT FOUND: EXIT" << endl; | |
252 | exit(0); // right instruction for exit ???? | |
253 | } | |
254 | // Arrays for "particles" and "hits" | |
255 | fBkgGeantParticles = new TClonesArray("TParticle", 200); | |
256 | fBkgGeantHits = new TClonesArray("AliMUONHit", 2000); | |
257 | // Event number to -1 for initialization | |
258 | fBkgGeantEventNumber = -1; | |
259 | // Back to the signal file: | |
260 | // first signal event must have been loaded previously, | |
261 | // otherwise, Segmentation violation at the next instruction | |
262 | // How is it possible to do smething better ???? | |
263 | ((gAlice->TreeK())->GetCurrentFile())->cd(); | |
264 | if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();} | |
265 | } | |
266 | return; | |
267 | } | |
268 | ||
269 | //__________________________________________________________________________ | |
270 | void AliMUONEventReconstructor::NextBkgGeantEvent(void) | |
271 | { | |
272 | // Get next event in background file for GEANT hits | |
273 | // Goes back to event number 0 when end of file is reached | |
274 | char treeName[20]; | |
275 | TBranch *branch; | |
276 | if (fPrintLevel >= 0) { | |
277 | cout << "Enter NextBkgGeantEvent" << endl;} | |
278 | // Clean previous event | |
279 | if(fBkgGeantTK) delete fBkgGeantTK; | |
280 | fBkgGeantTK = NULL; | |
281 | if(fBkgGeantParticles) fBkgGeantParticles->Clear(); | |
282 | if(fBkgGeantTH) delete fBkgGeantTH; | |
283 | fBkgGeantTH = NULL; | |
284 | if(fBkgGeantHits) fBkgGeantHits->Clear(); | |
285 | // Increment event number | |
286 | fBkgGeantEventNumber++; | |
287 | // Get access to Particles and Hits for event from background file | |
288 | if (fPrintLevel >= 2) {cout << "Before cd(Bkg)" << endl; gDirectory->Dump();} | |
289 | fBkgGeantFile->cd(); | |
290 | if (fPrintLevel >= 2) {cout << "After cd(Bkg)" << endl; gDirectory->Dump();} | |
291 | // Particles: TreeK for event and branch "Particles" | |
292 | sprintf(treeName, "TreeK%d", fBkgGeantEventNumber); | |
293 | fBkgGeantTK = (TTree*)gDirectory->Get(treeName); | |
294 | if (!fBkgGeantTK) { | |
295 | if (fPrintLevel >= 0) { | |
296 | cout << "Cannot find Kine Tree for background event: " << | |
297 | fBkgGeantEventNumber << endl; | |
298 | cout << "Goes back to event 0" << endl; | |
299 | } | |
300 | fBkgGeantEventNumber = 0; | |
301 | sprintf(treeName, "TreeK%d", fBkgGeantEventNumber); | |
302 | fBkgGeantTK = (TTree*)gDirectory->Get(treeName); | |
303 | if (!fBkgGeantTK) { | |
304 | cout << "ERROR: cannot find Kine Tree for background event: " << | |
305 | fBkgGeantEventNumber << endl; | |
306 | exit(0); | |
307 | } | |
308 | } | |
309 | if (fBkgGeantTK) | |
310 | fBkgGeantTK->SetBranchAddress("Particles", &fBkgGeantParticles); | |
311 | fBkgGeantTK->GetEvent(0); // why event 0 ???? necessary ???? | |
312 | // Hits: TreeH for event and branch "MUON" | |
313 | sprintf(treeName, "TreeH%d", fBkgGeantEventNumber); | |
314 | fBkgGeantTH = (TTree*)gDirectory->Get(treeName); | |
315 | if (!fBkgGeantTH) { | |
316 | cout << "ERROR: cannot find Hits Tree for background event: " << | |
317 | fBkgGeantEventNumber << endl; | |
318 | exit(0); | |
319 | } | |
320 | if (fBkgGeantTH && fBkgGeantHits) { | |
321 | branch = fBkgGeantTH->GetBranch("MUON"); | |
322 | if (branch) branch->SetAddress(&fBkgGeantHits); | |
323 | } | |
324 | fBkgGeantTH->GetEntries(); // necessary ???? | |
325 | // Back to the signal file | |
326 | ((gAlice->TreeK())->GetCurrentFile())->cd(); | |
327 | if (fPrintLevel >= 2) {cout << "After cd(gAlice)" << endl; gDirectory->Dump();} | |
328 | return; | |
329 | } | |
330 | ||
331 | //__________________________________________________________________________ | |
332 | void AliMUONEventReconstructor::EventReconstruct(void) | |
333 | { | |
334 | // To reconstruct one event | |
335 | if (fPrintLevel >= 1) cout << "enter EventReconstruct" << endl; | |
336 | MakeEventToBeReconstructed(); | |
337 | MakeSegments(); | |
338 | MakeTracks(); | |
339 | return; | |
340 | } | |
341 | ||
342 | //__________________________________________________________________________ | |
343 | void AliMUONEventReconstructor::ResetHitsForRec(void) | |
344 | { | |
345 | // To reset the array and the number of HitsForRec, | |
346 | // and also the number of HitsForRec | |
347 | // and the index of the first HitForRec per chamber | |
348 | if (fHitsForRecPtr) fHitsForRecPtr->Clear(); | |
349 | fNHitsForRec = 0; | |
350 | for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) | |
351 | fNHitsForRecPerChamber[ch] = fIndexOfFirstHitForRecPerChamber[ch] = 0; | |
352 | return; | |
353 | } | |
354 | ||
355 | //__________________________________________________________________________ | |
356 | void AliMUONEventReconstructor::ResetSegments(void) | |
357 | { | |
358 | // To reset the TClonesArray of segments and the number of Segments | |
359 | // for all stations | |
360 | for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) { | |
361 | if (fSegmentsPtr[st]) fSegmentsPtr[st]->Clear(); | |
362 | fNSegments[st] = 0; | |
363 | } | |
364 | return; | |
365 | } | |
366 | ||
367 | //__________________________________________________________________________ | |
368 | void AliMUONEventReconstructor::ResetTracks(void) | |
369 | { | |
370 | // To reset the TClonesArray of reconstructed tracks | |
371 | if (fRecTracksPtr) fRecTracksPtr->Clear(); | |
372 | fNRecTracks = 0; | |
373 | return; | |
374 | } | |
375 | ||
376 | //__________________________________________________________________________ | |
377 | void AliMUONEventReconstructor::MakeEventToBeReconstructed(void) | |
378 | { | |
379 | // To make the list of hits to be reconstructed, | |
380 | // either from the GEANT hits or from the raw clusters | |
381 | // according to the parameter set for the reconstructor | |
382 | if (fPrintLevel >= 1) cout << "enter MakeEventToBeReconstructed" << endl; | |
383 | ResetHitsForRec(); | |
384 | if (fRecGeantHits == 1) { | |
385 | // Reconstruction from GEANT hits | |
386 | // Back to the signal file | |
387 | ((gAlice->TreeK())->GetCurrentFile())->cd(); | |
388 | // Signal hits | |
389 | // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
390 | // Security on MUON ???? | |
391 | AddHitsForRecFromGEANT(gAlice->TreeH()); | |
392 | // Background hits | |
393 | AddHitsForRecFromBkgGEANT(fBkgGeantTH, fBkgGeantHits); | |
394 | // Sort HitsForRec in increasing order with respect to chamber number | |
395 | SortHitsForRecWithIncreasingChamber(); | |
396 | } | |
397 | else { | |
398 | // Reconstruction from raw clusters | |
399 | // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
400 | // Security on MUON ???? | |
401 | // TreeR assumed to be be "prepared" in calling function | |
402 | // by "MUON->GetTreeR(nev)" ???? | |
403 | TTree *TR = gAlice->TreeR(); | |
404 | AddHitsForRecFromRawClusters(TR); | |
405 | // No sorting: it is done automatically in the previous function | |
406 | } | |
407 | if (fPrintLevel >= 10) { | |
408 | cout << "end of MakeEventToBeReconstructed" << endl; | |
409 | cout << "NHitsForRec: " << fNHitsForRec << endl; | |
410 | for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) { | |
411 | cout << "chamber(0...): " << ch | |
412 | << " NHitsForRec: " << fNHitsForRecPerChamber[ch] | |
413 | << " index(first HitForRec): " << fIndexOfFirstHitForRecPerChamber[ch] | |
414 | << endl; | |
415 | for (Int_t hit = fIndexOfFirstHitForRecPerChamber[ch]; | |
416 | hit < fIndexOfFirstHitForRecPerChamber[ch] + fNHitsForRecPerChamber[ch]; | |
417 | hit++) { | |
418 | cout << "HitForRec index(0...): " << hit << endl; | |
419 | ((*fHitsForRecPtr)[hit])->Dump(); | |
420 | } | |
421 | } | |
422 | } | |
423 | return; | |
424 | } | |
425 | ||
426 | //__________________________________________________________________________ | |
427 | void AliMUONEventReconstructor::AddHitsForRecFromGEANT(TTree *TH) | |
428 | { | |
429 | // To add to the list of hits for reconstruction | |
430 | // the GEANT signal hits from a hit tree TH. | |
431 | if (fPrintLevel >= 2) | |
432 | cout << "enter AddHitsForRecFromGEANT with TH: " << TH << endl; | |
433 | if (TH == NULL) return; | |
434 | AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
435 | // Security on MUON ???? | |
436 | // See whether it could be the same for signal and background ???? | |
437 | // Loop over tracks in tree | |
438 | Int_t ntracks = (Int_t) TH->GetEntries(); | |
439 | if (fPrintLevel >= 2) | |
440 | cout << "ntracks: " << ntracks << endl; | |
441 | for (Int_t track = 0; track < ntracks; track++) { | |
442 | gAlice->ResetHits(); | |
443 | TH->GetEvent(track); | |
444 | // Loop over hits | |
445 | Int_t hit = 0; | |
446 | for (AliMUONHit* mHit = (AliMUONHit*) MUON->FirstHit(-1); | |
447 | mHit; | |
448 | mHit = (AliMUONHit*) MUON->NextHit(), hit++) { | |
449 | NewHitForRecFromGEANT(mHit,track, hit, 1); | |
450 | } // end of hit loop | |
451 | } // end of track loop | |
452 | return; | |
453 | } | |
454 | ||
455 | //__________________________________________________________________________ | |
456 | void AliMUONEventReconstructor::AddHitsForRecFromBkgGEANT(TTree *TH, TClonesArray *Hits) | |
457 | { | |
458 | // To add to the list of hits for reconstruction | |
459 | // the GEANT background hits from a hit tree TH and a pointer Hits to a hit list. | |
460 | // How to have only one function "AddHitsForRecFromGEANT" ???? | |
461 | if (fPrintLevel >= 2) | |
462 | cout << "enter AddHitsForRecFromBkgGEANT with TH: " << TH << endl; | |
463 | if (TH == NULL) return; | |
464 | // Loop over tracks in tree | |
465 | Int_t ntracks = (Int_t) TH->GetEntries(); | |
466 | if (fPrintLevel >= 2) | |
467 | cout << "ntracks: " << ntracks << endl; | |
468 | for (Int_t track = 0; track < ntracks; track++) { | |
469 | if (Hits) Hits->Clear(); | |
470 | TH->GetEvent(track); | |
471 | // Loop over hits | |
472 | for (Int_t hit = 0; hit < Hits->GetEntriesFast(); hit++) { | |
473 | NewHitForRecFromGEANT((AliMUONHit*) (*Hits)[hit], track, hit, 0); | |
474 | } // end of hit loop | |
475 | } // end of track loop | |
476 | return; | |
477 | } | |
478 | ||
479 | //__________________________________________________________________________ | |
480 | AliMUONHitForRec* AliMUONEventReconstructor::NewHitForRecFromGEANT(AliMUONHit* Hit, Int_t TrackNumber, Int_t HitNumber, Int_t Signal) | |
481 | { | |
482 | // To make a new hit for reconstruction from a GEANT hit pointed to by "Hit", | |
483 | // with hit number "HitNumber" in the track numbered "TrackNumber", | |
484 | // either from signal ("Signal" = 1) or background ("Signal" = 0) event. | |
485 | // Selects hits in tracking (not trigger) chambers. | |
486 | // Takes into account the efficiency (fEfficiency) | |
487 | // and the smearing from resolution (fBendingResolution and fNonBendingResolution). | |
488 | // Adds a condition on the radius between RMin and RMax | |
489 | // to better simulate the real chambers. | |
490 | // Returns the pointer to the new hit for reconstruction, | |
491 | // or NULL in case of inefficiency or non tracking chamber or bad radius. | |
492 | // No condition on at most 20 cm from a muon from a resonance | |
493 | // like in Fortran TRACKF_STAT. | |
494 | AliMUONHitForRec* hitForRec; | |
495 | Double_t bendCoor, nonBendCoor, radius; | |
496 | Int_t chamber = Hit->fChamber - 1; // chamber(0...) | |
497 | // only in tracking chambers (fChamber starts at 1) | |
498 | if (chamber >= MAX_MUON_TRACKING_CHAMBERS) return NULL; | |
499 | // only if hit is efficient (keep track for checking ????) | |
500 | if (gRandom->Rndm() > fEfficiency) return NULL; | |
501 | // only if radius between RMin and RMax | |
502 | bendCoor = Hit->fY; | |
503 | nonBendCoor = Hit->fX; | |
504 | radius = TMath::Sqrt((bendCoor * bendCoor) + (nonBendCoor * nonBendCoor)); | |
505 | if ((radius < fRMin[chamber]) || (radius > fRMax[chamber])) return NULL; | |
506 | // new AliMUONHitForRec from GEANT hit and increment number of AliMUONHitForRec's | |
507 | hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(Hit); | |
508 | fNHitsForRec++; | |
509 | // add smearing from resolution | |
510 | hitForRec->SetBendingCoor(bendCoor + gRandom->Gaus(0., fBendingResolution)); | |
511 | hitForRec->SetNonBendingCoor(nonBendCoor | |
512 | + gRandom->Gaus(0., fNonBendingResolution)); | |
513 | // more information into HitForRec | |
514 | // resolution: angular effect to be added here ???? | |
515 | hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution); | |
516 | hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution); | |
517 | // GEANT track info | |
518 | hitForRec->SetHitNumber(HitNumber); | |
519 | hitForRec->SetTHTrack(TrackNumber); | |
520 | hitForRec->SetGeantSignal(Signal); | |
521 | if (fPrintLevel >= 10) { | |
522 | cout << "track: " << TrackNumber << " hit: " << HitNumber << endl; | |
523 | Hit->Dump(); | |
524 | cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl; | |
525 | hitForRec->Dump();} | |
526 | return hitForRec; | |
527 | } | |
528 | ||
529 | //__________________________________________________________________________ | |
530 | void AliMUONEventReconstructor::SortHitsForRecWithIncreasingChamber() | |
531 | { | |
532 | // Sort HitsForRec's in increasing order with respect to chamber number. | |
533 | // Uses the function "Compare". | |
534 | // Update the information for HitsForRec per chamber too. | |
535 | Int_t ch, nhits, prevch; | |
536 | fHitsForRecPtr->Sort(); | |
537 | for (ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) { | |
538 | fNHitsForRecPerChamber[ch] = 0; | |
539 | fIndexOfFirstHitForRecPerChamber[ch] = 0; | |
540 | } | |
541 | prevch = 0; // previous chamber | |
542 | nhits = 0; // number of hits in current chamber | |
543 | // Loop over HitsForRec | |
544 | for (Int_t hit = 0; hit < fNHitsForRec; hit++) { | |
545 | // chamber number (0...) | |
546 | ch = ((AliMUONHitForRec*) ((*fHitsForRecPtr)[hit]))->GetChamberNumber(); | |
547 | // increment number of hits in current chamber | |
548 | (fNHitsForRecPerChamber[ch])++; | |
549 | // update index of first HitForRec in current chamber | |
550 | // if chamber number different from previous one | |
551 | if (ch != prevch) { | |
552 | fIndexOfFirstHitForRecPerChamber[ch] = hit; | |
553 | prevch = ch; | |
554 | } | |
555 | } | |
556 | return; | |
557 | } | |
558 | ||
559 | // //__________________________________________________________________________ | |
560 | // void AliMUONEventReconstructor::AddHitsForRecFromCathodeCorrelations(TTree* TC) | |
561 | // { | |
562 | // // OLD VERSION WHEN ONE ONE WAS USING SO CALLED CATHODE CORRELATIONS | |
563 | // // To add to the list of hits for reconstruction | |
564 | // // the (cathode correlated) raw clusters | |
565 | // // No condition added, like in Fortran TRACKF_STAT, | |
566 | // // on the radius between RMin and RMax. | |
567 | // AliMUONHitForRec *hitForRec; | |
568 | // if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromCathodeCorrelations" << endl; | |
569 | // AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
570 | // // Security on MUON ???? | |
571 | // // Loop over tracking chambers | |
572 | // for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) { | |
573 | // // number of HitsForRec to 0 for the chamber | |
574 | // fNHitsForRecPerChamber[ch] = 0; | |
575 | // // index of first HitForRec for the chamber | |
576 | // if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0; | |
577 | // else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec; | |
578 | // TClonesArray *reconst_hits = MUON->ReconstHitsAddress(ch); | |
579 | // MUON->ResetReconstHits(); | |
580 | // TC->GetEvent(); | |
581 | // Int_t ncor = (Int_t)reconst_hits->GetEntries(); | |
582 | // // Loop over (cathode correlated) raw clusters | |
583 | // for (Int_t cor = 0; cor < ncor; cor++) { | |
584 | // AliMUONReconstHit * mCor = | |
585 | // (AliMUONReconstHit*) reconst_hits->UncheckedAt(cor); | |
586 | // // new AliMUONHitForRec from (cathode correlated) raw cluster | |
587 | // // and increment number of AliMUONHitForRec's (total and in chamber) | |
588 | // hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(mCor); | |
589 | // fNHitsForRec++; | |
590 | // (fNHitsForRecPerChamber[ch])++; | |
591 | // // more information into HitForRec | |
592 | // hitForRec->SetChamberNumber(ch); | |
593 | // hitForRec->SetHitNumber(cor); | |
594 | // // Z coordinate of the chamber (cm) with sign opposite to GEANT sign | |
595 | // // could (should) be more exact from chamber geometry ???? | |
596 | // hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z()); | |
597 | // if (fPrintLevel >= 10) { | |
598 | // cout << "chamber (0...): " << ch << | |
599 | // " cathcorrel (0...): " << cor << endl; | |
600 | // mCor->Dump(); | |
601 | // cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl; | |
602 | // hitForRec->Dump();} | |
603 | // } // end of cluster loop | |
604 | // } // end of chamber loop | |
605 | // return; | |
606 | // } | |
607 | ||
608 | //__________________________________________________________________________ | |
609 | void AliMUONEventReconstructor::AddHitsForRecFromRawClusters(TTree* TR) | |
610 | { | |
611 | // To add to the list of hits for reconstruction all the raw clusters | |
612 | // No condition added, like in Fortran TRACKF_STAT, | |
613 | // on the radius between RMin and RMax. | |
614 | AliMUONHitForRec *hitForRec; | |
615 | AliMUONRawCluster *clus; | |
616 | Int_t iclus, nclus; | |
617 | TClonesArray *rawclusters; | |
618 | if (fPrintLevel >= 1) cout << "enter AddHitsForRecFromRawClusters" << endl; | |
619 | AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
620 | // Security on MUON ???? | |
621 | // Loop over tracking chambers | |
622 | for (Int_t ch = 0; ch < MAX_MUON_TRACKING_CHAMBERS; ch++) { | |
623 | // number of HitsForRec to 0 for the chamber | |
624 | fNHitsForRecPerChamber[ch] = 0; | |
625 | // index of first HitForRec for the chamber | |
626 | if (ch == 0) fIndexOfFirstHitForRecPerChamber[ch] = 0; | |
627 | else fIndexOfFirstHitForRecPerChamber[ch] = fNHitsForRec; | |
628 | rawclusters = MUON->RawClustAddress(ch); | |
629 | MUON->ResetRawClusters(); | |
630 | TR->GetEvent((Int_t) (TR->GetEntries()) - 1); // to be checked ???? | |
631 | nclus = (Int_t) (rawclusters->GetEntries()); | |
632 | // Loop over (cathode correlated) raw clusters | |
633 | for (iclus = 0; iclus < nclus; iclus++) { | |
634 | clus = (AliMUONRawCluster*) rawclusters->UncheckedAt(iclus); | |
635 | // new AliMUONHitForRec from raw cluster | |
636 | // and increment number of AliMUONHitForRec's (total and in chamber) | |
637 | hitForRec = new ((*fHitsForRecPtr)[fNHitsForRec]) AliMUONHitForRec(clus); | |
638 | fNHitsForRec++; | |
639 | (fNHitsForRecPerChamber[ch])++; | |
640 | // more information into HitForRec | |
641 | // resolution: info should be already in raw cluster and taken from it ???? | |
642 | hitForRec->SetBendingReso2(fBendingResolution * fBendingResolution); | |
643 | hitForRec->SetNonBendingReso2(fNonBendingResolution * fNonBendingResolution); | |
644 | // original raw cluster | |
645 | hitForRec->SetChamberNumber(ch); | |
646 | hitForRec->SetHitNumber(iclus); | |
647 | // Z coordinate of the chamber (cm) with sign opposite to GEANT sign | |
648 | // could (should) be more exact from chamber geometry ???? | |
649 | hitForRec->SetZ(-(&(MUON->Chamber(ch)))->Z()); | |
650 | if (fPrintLevel >= 10) { | |
651 | cout << "chamber (0...): " << ch << | |
652 | " raw cluster (0...): " << iclus << endl; | |
653 | clus->Dump(); | |
654 | cout << "AliMUONHitForRec number (1...): " << fNHitsForRec << endl; | |
655 | hitForRec->Dump();} | |
656 | } // end of cluster loop | |
657 | } // end of chamber loop | |
658 | return; | |
659 | } | |
660 | ||
661 | //__________________________________________________________________________ | |
662 | void AliMUONEventReconstructor::MakeSegments(void) | |
663 | { | |
664 | // To make the list of segments in all stations, | |
665 | // from the list of hits to be reconstructed | |
666 | if (fPrintLevel >= 1) cout << "enter MakeSegments" << endl; | |
667 | ResetSegments(); | |
668 | // Loop over stations | |
669 | for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) | |
670 | MakeSegmentsPerStation(st); | |
671 | if (fPrintLevel >= 10) { | |
672 | cout << "end of MakeSegments" << endl; | |
673 | for (Int_t st = 0; st < MAX_MUON_TRACKING_STATIONS; st++) { | |
674 | cout << "station(0...): " << st | |
675 | << " Segments: " << fNSegments[st] | |
676 | << endl; | |
677 | for (Int_t seg = 0; | |
678 | seg < fNSegments[st]; | |
679 | seg++) { | |
680 | cout << "Segment index(0...): " << seg << endl; | |
681 | ((*fSegmentsPtr[st])[seg])->Dump(); | |
682 | } | |
683 | } | |
684 | } | |
685 | return; | |
686 | } | |
687 | ||
688 | //__________________________________________________________________________ | |
689 | void AliMUONEventReconstructor::MakeSegmentsPerStation(Int_t Station) | |
690 | { | |
691 | // To make the list of segments in station number "Station" (0...) | |
692 | // from the list of hits to be reconstructed. | |
693 | // Updates "fNSegments"[Station]. | |
694 | // Segments in stations 4 and 5 are sorted | |
695 | // according to increasing absolute value of "impact parameter" | |
696 | AliMUONHitForRec *hit1Ptr, *hit2Ptr; | |
697 | AliMUONSegment *segment; | |
698 | Bool_t last2st; | |
699 | Double_t bendingSlope, distBend, distNonBend, extBendCoor, extNonBendCoor, | |
700 | impactParam, maxImpactParam; | |
701 | AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
702 | if (fPrintLevel >= 1) | |
703 | cout << "enter MakeSegmentsPerStation (0...) " << Station << endl; | |
704 | // first and second chambers (0...) in the station | |
705 | Int_t ch1 = 2 * Station; | |
706 | Int_t ch2 = ch1 + 1; | |
707 | // variable true for stations downstream of the dipole: | |
708 | // Station(0..4) equal to 3 or 4 | |
709 | if ((Station == 3) || (Station == 4)) { | |
710 | last2st = kTRUE; | |
711 | // maximum impact parameter (cm) according to fMinBendingMomentum... | |
712 | maxImpactParam = | |
713 | TMath::Abs(GetImpactParamFromBendingMomentum(fMinBendingMomentum)); | |
714 | } | |
715 | else last2st = kFALSE; | |
716 | // extrapolation factor from Z of first chamber to Z of second chamber | |
717 | // dZ to be changed to take into account fine structure of chambers ???? | |
718 | Double_t extrapFact = | |
719 | (&(MUON->Chamber(ch2)))->Z() / (&(MUON->Chamber(ch1)))->Z(); | |
720 | // index for current segment | |
721 | Int_t segmentIndex = 0; | |
722 | // Loop over HitsForRec in the first chamber of the station | |
723 | for (Int_t hit1 = fIndexOfFirstHitForRecPerChamber[ch1]; | |
724 | hit1 < fIndexOfFirstHitForRecPerChamber[ch1] + fNHitsForRecPerChamber[ch1]; | |
725 | hit1++) { | |
726 | // pointer to the HitForRec | |
727 | hit1Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit1]); | |
728 | // extrapolation, | |
729 | // on the straight line joining the HitForRec to the vertex (0,0,0), | |
730 | // to the Z of the second chamber of the station | |
731 | extBendCoor = extrapFact * hit1Ptr->GetBendingCoor(); | |
732 | extNonBendCoor = extrapFact * hit1Ptr->GetNonBendingCoor(); | |
733 | // Loop over HitsForRec in the second chamber of the station | |
734 | for (Int_t hit2 = fIndexOfFirstHitForRecPerChamber[ch2]; | |
735 | hit2 < fIndexOfFirstHitForRecPerChamber[ch2] + fNHitsForRecPerChamber[ch2]; | |
736 | hit2++) { | |
737 | // pointer to the HitForRec | |
738 | hit2Ptr = (AliMUONHitForRec*) ((*fHitsForRecPtr)[hit2]); | |
739 | // absolute values of distances, in bending and non bending planes, | |
740 | // between the HitForRec in the second chamber | |
741 | // and the previous extrapolation | |
742 | distBend = TMath::Abs(hit2Ptr->GetBendingCoor() - extBendCoor); | |
743 | distNonBend = TMath::Abs(hit2Ptr->GetNonBendingCoor() - extNonBendCoor); | |
744 | if (last2st) { | |
745 | // bending slope | |
746 | bendingSlope = (hit1Ptr->GetBendingCoor() - hit2Ptr->GetBendingCoor()) / | |
747 | (hit1Ptr->GetZ() - hit2Ptr->GetZ()); | |
748 | // absolute value of impact parameter | |
749 | impactParam = | |
750 | TMath::Abs(hit1Ptr->GetBendingCoor() - hit2Ptr->GetZ() * bendingSlope); | |
751 | } | |
752 | // check for distances not too large, | |
753 | // and impact parameter not too big if stations downstream of the dipole. | |
754 | // Conditions "distBend" and "impactParam" correlated for these stations ???? | |
755 | if ((distBend < fSegmentMaxDistBending[Station]) && | |
756 | (distNonBend < fSegmentMaxDistNonBending[Station]) && | |
757 | (!last2st || (impactParam < maxImpactParam))) { | |
758 | // make new segment | |
759 | segment = new ((*fSegmentsPtr[Station])[segmentIndex]) | |
760 | AliMUONSegment(hit1Ptr, hit2Ptr); | |
761 | // update "link" to this segment from the hit in the first chamber | |
762 | if (hit1Ptr->GetNSegments() == 0) | |
763 | hit1Ptr->SetIndexOfFirstSegment(segmentIndex); | |
764 | hit1Ptr->SetNSegments(hit1Ptr->GetNSegments() + 1); | |
765 | if (fPrintLevel >= 10) { | |
766 | cout << "segmentIndex(0...): " << segmentIndex | |
767 | << " distBend: " << distBend | |
768 | << " distNonBend: " << distNonBend | |
769 | << endl; | |
770 | segment->Dump(); | |
771 | cout << "HitForRec in first chamber" << endl; | |
772 | hit1Ptr->Dump(); | |
773 | cout << "HitForRec in second chamber" << endl; | |
774 | hit2Ptr->Dump(); | |
775 | }; | |
776 | // increment index for current segment | |
777 | segmentIndex++; | |
778 | } | |
779 | } //for (Int_t hit2 | |
780 | } // for (Int_t hit1... | |
781 | fNSegments[Station] = segmentIndex; | |
782 | // Sorting according to "impact parameter" if station(1..5) 4 or 5, | |
783 | // i.e. Station(0..4) 3 or 4, using the function "Compare". | |
784 | // After this sorting, it is impossible to use | |
785 | // the "fNSegments" and "fIndexOfFirstSegment" | |
786 | // of the HitForRec in the first chamber to explore all segments formed with it. | |
787 | // Is this sorting really needed ???? | |
788 | if ((Station == 3) || (Station == 4)) (fSegmentsPtr[Station])->Sort(); | |
789 | if (fPrintLevel >= 1) cout << "Station: " << Station << " NSegments: " | |
790 | << fNSegments[Station] << endl; | |
791 | return; | |
792 | } | |
793 | ||
794 | //__________________________________________________________________________ | |
795 | void AliMUONEventReconstructor::MakeTracks(void) | |
796 | { | |
797 | // To make the tracks, | |
798 | // from the list of segments and points in all stations | |
799 | if (fPrintLevel >= 1) cout << "enter MakeTracks" << endl; | |
800 | ResetTracks(); | |
801 | // Look for candidates from at least 3 aligned points in stations(1..) 4 and 5 | |
802 | MakeTrackCandidates(); | |
803 | // Follow tracks in stations(1..) 3, 2 and 1 | |
804 | FollowTracks(); | |
805 | return; | |
806 | } | |
807 | ||
808 | //__________________________________________________________________________ | |
809 | Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithTwoSegments(AliMUONSegment *BegSegment) | |
810 | { | |
811 | // To make track candidates with two segments in stations(1..) 4 and 5, | |
812 | // the first segment being pointed to by "BegSegment". | |
813 | // Returns the number of such track candidates. | |
814 | Int_t endStation, iEndSegment, nbCan2Seg; | |
815 | AliMUONSegment *endSegment, *extrapSegment; | |
816 | AliMUONTrack *recTrack; | |
817 | Double_t mcsFactor; | |
818 | if (fPrintLevel >= 1) cout << "enter MakeTrackCandidatesWithTwoSegments" << endl; | |
819 | // Station for the end segment | |
820 | endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2; | |
821 | // multiple scattering factor corresponding to one chamber | |
822 | mcsFactor = 0.0136 / | |
823 | GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact()); | |
824 | mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor; | |
825 | // linear extrapolation to end station | |
826 | extrapSegment = | |
827 | BegSegment->CreateSegmentFromLinearExtrapToStation(endStation, mcsFactor); | |
828 | // number of candidates with 2 segments to 0 | |
829 | nbCan2Seg = 0; | |
830 | // Loop over segments in the end station | |
831 | for (iEndSegment = 0; iEndSegment < fNSegments[endStation]; iEndSegment++) { | |
832 | // pointer to segment | |
833 | endSegment = (AliMUONSegment*) ((*fSegmentsPtr[endStation])[iEndSegment]); | |
834 | // test compatibility between current segment and "extrapSegment" | |
835 | if ((endSegment-> | |
836 | NormalizedChi2WithSegment(extrapSegment, | |
837 | fMaxSigma2Distance)) <= 4.0) { | |
838 | // both segments compatible: | |
839 | // make track candidate from "begSegment" and "endSegment" | |
840 | if (fPrintLevel >= 2) | |
841 | cout << "TrackCandidate with Segment " << iEndSegment << | |
842 | " in Station(0..) " << endStation << endl; | |
843 | // flag for both segments in one track: | |
844 | // to be done in track constructor ???? | |
845 | BegSegment->SetInTrack(kTRUE); | |
846 | endSegment->SetInTrack(kTRUE); | |
847 | recTrack = new ((*fRecTracksPtr)[fNRecTracks]) | |
848 | AliMUONTrack(BegSegment, endSegment, this); | |
849 | fNRecTracks++; | |
850 | if (fPrintLevel >= 10) recTrack->RecursiveDump(); | |
851 | // increment number of track candidates with 2 segments | |
852 | nbCan2Seg++; | |
853 | } | |
854 | } // for (iEndSegment = 0;... | |
855 | delete extrapSegment; // should not delete HitForRec's it points to !!!! | |
856 | return nbCan2Seg; | |
857 | } | |
858 | ||
859 | //__________________________________________________________________________ | |
860 | Int_t AliMUONEventReconstructor::MakeTrackCandidatesWithOneSegmentAndOnePoint(AliMUONSegment *BegSegment) | |
861 | { | |
862 | // To make track candidates with one segment and one point | |
863 | // in stations(1..) 4 and 5, | |
864 | // the segment being pointed to by "BegSegment". | |
865 | Int_t ch, ch1, ch2, endStation, iHit, iHitMax, iHitMin, nbCan1Seg1Hit; | |
866 | AliMUONHitForRec *extrapHitForRec, *hit; | |
867 | AliMUONTrack *recTrack; | |
868 | Double_t mcsFactor; | |
869 | if (fPrintLevel >= 1) | |
870 | cout << "enter MakeTrackCandidatesWithOneSegmentAndOnePoint" << endl; | |
871 | // station for the end point | |
872 | endStation = 7 - (BegSegment->GetHitForRec1())->GetChamberNumber() / 2; | |
873 | // multiple scattering factor corresponding to one chamber | |
874 | mcsFactor = 0.0136 / | |
875 | GetBendingMomentumFromImpactParam(BegSegment->GetBendingImpact()); | |
876 | mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor; | |
877 | // first and second chambers(0..) in the end station | |
878 | ch1 = 2 * endStation; | |
879 | ch2 = ch1 + 1; | |
880 | // number of candidates to 0 | |
881 | nbCan1Seg1Hit = 0; | |
882 | // Loop over chambers of the end station | |
883 | for (ch = ch2; ch >= ch1; ch--) { | |
884 | // linear extrapolation to chamber | |
885 | extrapHitForRec = | |
886 | BegSegment->CreateHitForRecFromLinearExtrapToChamber(ch, mcsFactor); | |
887 | // limits for the hit index in the loop | |
888 | iHitMin = fIndexOfFirstHitForRecPerChamber[ch]; | |
889 | iHitMax = iHitMin + fNHitsForRecPerChamber[ch]; | |
890 | // Loop over HitForRec's in the chamber | |
891 | for (iHit = iHitMin; iHit < iHitMax; iHit++) { | |
892 | // pointer to HitForRec | |
893 | hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]); | |
894 | // test compatibility between current HitForRec and "extrapHitForRec" | |
895 | if ((hit-> | |
896 | NormalizedChi2WithHitForRec(extrapHitForRec, | |
897 | fMaxSigma2Distance)) <= 2.0) { | |
898 | // both HitForRec's compatible: | |
899 | // make track candidate from begSegment and current HitForRec | |
900 | if (fPrintLevel >= 2) | |
901 | cout << "TrackCandidate with HitForRec " << iHit << | |
902 | " in Chamber(0..) " << ch << endl; | |
903 | // flag for beginning segments in one track: | |
904 | // to be done in track constructor ???? | |
905 | BegSegment->SetInTrack(kTRUE); | |
906 | recTrack = new ((*fRecTracksPtr)[fNRecTracks]) | |
907 | AliMUONTrack(BegSegment, hit, this); | |
908 | // the right place to eliminate "double counting" ???? how ???? | |
909 | fNRecTracks++; | |
910 | if (fPrintLevel >= 10) recTrack->RecursiveDump(); | |
911 | // increment number of track candidates | |
912 | nbCan1Seg1Hit++; | |
913 | } | |
914 | } // for (iHit = iHitMin;... | |
915 | delete extrapHitForRec; | |
916 | } // for (ch = ch2;... | |
917 | return nbCan1Seg1Hit; | |
918 | } | |
919 | ||
920 | //__________________________________________________________________________ | |
921 | void AliMUONEventReconstructor::MakeTrackCandidates(void) | |
922 | { | |
923 | // To make track candidates | |
924 | // with at least 3 aligned points in stations(1..) 4 and 5 | |
925 | // (two Segment's or one Segment and one HitForRec) | |
926 | Int_t begStation, iBegSegment, nbCan1Seg1Hit, nbCan2Seg; | |
927 | AliMUONSegment *begSegment; | |
928 | if (fPrintLevel >= 1) cout << "enter MakeTrackCandidates" << endl; | |
929 | // Loop over stations(1..) 5 and 4 for the beginning segment | |
930 | for (begStation = 4; begStation > 2; begStation--) { | |
931 | // Loop over segments in the beginning station | |
932 | for (iBegSegment = 0; iBegSegment < fNSegments[begStation]; iBegSegment++) { | |
933 | // pointer to segment | |
934 | begSegment = (AliMUONSegment*) ((*fSegmentsPtr[begStation])[iBegSegment]); | |
935 | if (fPrintLevel >= 2) | |
936 | cout << "look for TrackCandidate's with Segment " << iBegSegment << | |
937 | " in Station(0..) " << begStation << endl; | |
938 | // Look for track candidates with two segments, | |
939 | // "begSegment" and all compatible segments in other station. | |
940 | // Only for beginning station(1..) 5 | |
941 | // because candidates with 2 segments have to looked for only once. | |
942 | if (begStation == 4) | |
943 | nbCan2Seg = MakeTrackCandidatesWithTwoSegments(begSegment); | |
944 | // Look for track candidates with one segments and one point, | |
945 | // "begSegment" and all compatible HitForRec's in other station. | |
946 | // Only if "begSegment" does not belong already to a track candidate. | |
947 | // Is that a too strong condition ???? | |
948 | if (!(begSegment->GetInTrack())) | |
949 | nbCan1Seg1Hit = MakeTrackCandidatesWithOneSegmentAndOnePoint(begSegment); | |
950 | } // for (iBegSegment = 0;... | |
951 | } // for (begStation = 4;... | |
952 | return; | |
953 | } | |
954 | ||
955 | //__________________________________________________________________________ | |
956 | void AliMUONEventReconstructor::FollowTracks(void) | |
957 | { | |
958 | // Follow tracks in stations(1..) 3, 2 and 1 | |
959 | AliMUONHitForRec *bestHit, *extrapHit, *hit; | |
960 | AliMUONSegment *bestSegment, *extrapSegment, *segment; | |
961 | AliMUONTrack *track; | |
962 | AliMUONTrackParam *trackParam1, trackParam[2]; | |
963 | Int_t ch, chBestHit, iHit, iSegment, station, trackIndex; | |
964 | Double_t bestChi2, chi2, dZ1, dZ2, maxSigma2Distance, mcsFactor; | |
965 | AliMUON *MUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
966 | maxSigma2Distance = 4. * fMaxSigma2Distance; // sigma2cut increased by 4 !!!! | |
967 | if (fPrintLevel >= 2) | |
968 | cout << "enter FollowTracks" << endl; | |
969 | // Loop over track candidates | |
970 | for (trackIndex = 0; trackIndex < fNRecTracks; trackIndex++) { | |
971 | if (fPrintLevel >= 2) | |
972 | cout << "FollowTracks: track candidate(0..): " << trackIndex << endl; | |
973 | // function for each track candidate ???? | |
974 | track = (AliMUONTrack*) ((*fRecTracksPtr)[trackIndex]); | |
975 | // Fit track candidate from vertex at X = Y = 0 | |
976 | track->Fit(track->GetTrackParamAtVertex(), 3); | |
977 | if (fPrintLevel >= 10) { | |
978 | cout << "FollowTracks: track candidate(0..): " << trackIndex | |
979 | << " after fit in stations(1..) 4 and 5" << endl; | |
980 | track->RecursiveDump(); | |
981 | } | |
982 | // Loop over stations(1..) 3, 2 and 1 | |
983 | // something SPECIAL for stations 2 and 1 for majority coincidence ???? | |
984 | for (station = 2; station >= 0; station--) { | |
985 | // Track parameters at first track hit (smallest Z) | |
986 | trackParam1 = ((AliMUONTrackHit*) | |
987 | (track->GetTrackHitsPtr()->First()))->GetTrackParam(); | |
988 | // extrapolation to station | |
989 | trackParam1->ExtrapToStation(station, trackParam); | |
990 | extrapSegment = new AliMUONSegment::AliMUONSegment(); // empty segment | |
991 | // multiple scattering factor corresponding to one chamber | |
992 | // and momentum in bending plane (not total) | |
993 | mcsFactor = 0.0136 * trackParam1->GetInverseBendingMomentum(); | |
994 | mcsFactor = fChamberThicknessInX0 * mcsFactor * mcsFactor; | |
995 | // Z difference from previous station | |
996 | dZ1 = (&(MUON->Chamber(2 * station)))->Z() - | |
997 | (&(MUON->Chamber(2 * station + 2)))->Z(); | |
998 | // Z difference between the two previous stations | |
999 | dZ2 = (&(MUON->Chamber(2 * station + 2)))->Z() - | |
1000 | (&(MUON->Chamber(2 * station + 4)))->Z(); | |
1001 | extrapSegment->SetBendingCoorReso2(fBendingResolution); | |
1002 | extrapSegment->SetNonBendingCoorReso2(fNonBendingResolution); | |
1003 | extrapSegment->UpdateFromStationTrackParam(trackParam, mcsFactor, dZ1, dZ2); | |
1004 | bestChi2 = 5.0; | |
1005 | bestSegment = NULL; | |
1006 | if (fPrintLevel >= 10) { | |
1007 | cout << "FollowTracks: track candidate(0..): " << trackIndex | |
1008 | << " Look for segment in station(0..): " << station << endl; | |
1009 | } | |
1010 | // Loop over segments in station | |
1011 | for (iSegment = 0; iSegment < fNSegments[station]; iSegment++) { | |
1012 | // Look for best compatible Segment in station | |
1013 | // should consider all possibilities ???? | |
1014 | // multiple scattering ???? | |
1015 | // separation in 2 functions: Segment and HitForRec ???? | |
1016 | segment = (AliMUONSegment*) ((*fSegmentsPtr[station])[iSegment]); | |
1017 | chi2 = segment->NormalizedChi2WithSegment(extrapSegment, maxSigma2Distance); | |
1018 | if (chi2 < bestChi2) { | |
1019 | // update best Chi2 and Segment if better found | |
1020 | bestSegment = segment; | |
1021 | bestChi2 = chi2; | |
1022 | } | |
1023 | } | |
1024 | if (bestSegment) { | |
1025 | // best segment found: add it to track candidate | |
1026 | track->AddSegment(bestSegment); | |
1027 | // set track parameters at these two TrakHit's | |
1028 | track->SetTrackParamAtHit(track->GetNTrackHits() - 2, &(trackParam[0])); | |
1029 | track->SetTrackParamAtHit(track->GetNTrackHits() - 1, &(trackParam[1])); | |
1030 | if (fPrintLevel >= 10) { | |
1031 | cout << "FollowTracks: track candidate(0..): " << trackIndex | |
1032 | << " Added segment in station(0..): " << station << endl; | |
1033 | track->RecursiveDump(); | |
1034 | } | |
1035 | } | |
1036 | else { | |
1037 | // No best segment found: | |
1038 | // Look for best compatible HitForRec in station: | |
1039 | // should consider all possibilities ???? | |
1040 | // multiple scattering ???? do about like for extrapSegment !!!! | |
1041 | extrapHit = new AliMUONHitForRec::AliMUONHitForRec(); // empty hit | |
1042 | bestChi2 = 3.0; | |
1043 | bestHit = NULL; | |
1044 | if (fPrintLevel >= 10) { | |
1045 | cout << "FollowTracks: track candidate(0..): " << trackIndex | |
1046 | << " Segment not found, look for hit in station(0..): " << station | |
1047 | << endl; | |
1048 | } | |
1049 | // Loop over chambers of the station | |
1050 | for (ch = 0; ch < 2; ch++) { | |
1051 | // coordinates of extrapolated hit | |
1052 | extrapHit->SetBendingCoor((&(trackParam[ch]))->GetBendingCoor()); | |
1053 | extrapHit->SetNonBendingCoor((&(trackParam[ch]))->GetNonBendingCoor()); | |
1054 | // resolutions from "extrapSegment" | |
1055 | extrapHit->SetBendingReso2(extrapSegment->GetBendingCoorReso2()); | |
1056 | extrapHit->SetNonBendingReso2(extrapSegment->GetNonBendingCoorReso2()); | |
1057 | // Loop over hits in the chamber | |
1058 | for (iHit = fIndexOfFirstHitForRecPerChamber[ch]; | |
1059 | iHit < fIndexOfFirstHitForRecPerChamber[ch] + | |
1060 | fNHitsForRecPerChamber[ch]; | |
1061 | iHit++) { | |
1062 | hit = (AliMUONHitForRec*) ((*fHitsForRecPtr)[iHit]); | |
1063 | // condition for hit not already in segment ???? | |
1064 | chi2 = hit->NormalizedChi2WithHitForRec(extrapHit, maxSigma2Distance); | |
1065 | if (chi2 < bestChi2) { | |
1066 | // update best Chi2 and HitForRec if better found | |
1067 | bestHit = hit; | |
1068 | bestChi2 = chi2; | |
1069 | chBestHit = ch; | |
1070 | } | |
1071 | } | |
1072 | } | |
1073 | if (bestHit) { | |
1074 | // best hit found: add it to track candidate | |
1075 | track->AddHitForRec(bestHit); | |
1076 | // set track parameters at these two TrakHit's | |
1077 | track->SetTrackParamAtHit(track->GetNTrackHits() - 1, | |
1078 | &(trackParam[chBestHit])); | |
1079 | if (fPrintLevel >= 10) { | |
1080 | cout << "FollowTracks: track candidate(0..): " << trackIndex | |
1081 | << " Added hit in station(0..): " << station << endl; | |
1082 | track->RecursiveDump(); | |
1083 | } | |
1084 | } | |
1085 | else { | |
1086 | fRecTracksPtr->RemoveAt(trackIndex); // Remove candidate | |
1087 | break; // stop the search for this candidate: | |
1088 | // exit from the loop over station | |
1089 | } | |
1090 | } | |
1091 | // Sort track hits according to increasing Z | |
1092 | track->GetTrackHitsPtr()->Sort(); | |
1093 | // Update track parameters at first track hit (smallest Z) | |
1094 | trackParam1 = ((AliMUONTrackHit*) | |
1095 | (track->GetTrackHitsPtr()->First()))->GetTrackParam(); | |
1096 | // Track fit from first track hit varying X and Y | |
1097 | track->Fit(trackParam1, 5); | |
1098 | if (fPrintLevel >= 10) { | |
1099 | cout << "FollowTracks: track candidate(0..): " << trackIndex | |
1100 | << " after fit from station(0..): " << station << " to 4" << endl; | |
1101 | track->RecursiveDump(); | |
1102 | } | |
1103 | delete extrapSegment; | |
1104 | } // for (station = 2;... | |
1105 | } // for (trackIndex = 0;... | |
1106 | return; | |
1107 | } | |
1108 | ||
1109 | void AliMUONEventReconstructor::Streamer(TBuffer &R__b) | |
1110 | { | |
1111 | ; | |
1112 | } |