]>
Commit | Line | Data |
---|---|---|
bcb6fb78 | 1 | |
e4f2f73d | 2 | /************************************************************************** |
3 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * * | |
5 | * Author: The ALICE Off-line Project. * | |
6 | * Contributors are mentioned in the code where appropriate. * | |
7 | * * | |
8 | * Permission to use, copy, modify and distribute this software and its * | |
9 | * documentation strictly for non-commercial purposes is hereby granted * | |
10 | * without fee, provided that the above copyright notice appears in all * | |
11 | * copies and that both the copyright notice and this permission notice * | |
12 | * appear in the supporting documentation. The authors make no claims * | |
13 | * about the suitability of this software for any purpose. It is * | |
14 | * provided "as is" without express or implied warranty. * | |
15 | **************************************************************************/ | |
16 | ||
17 | /* $Id$ */ | |
18 | ||
19 | /////////////////////////////////////////////////////////////////////////////// | |
20 | // // | |
21 | // Track finder // | |
22 | // // | |
23 | // Authors: // | |
24 | // Alex Bercuci <A.Bercuci@gsi.de> // | |
25 | // Markus Fasel <M.Fasel@gsi.de> // | |
26 | // // | |
27 | /////////////////////////////////////////////////////////////////////////////// | |
28 | ||
29 | #include <Riostream.h> | |
30 | #include <stdio.h> | |
31 | #include <string.h> | |
32 | ||
33 | #include <TBranch.h> | |
34 | #include <TFile.h> | |
35 | #include <TGraph.h> | |
36 | #include <TH1D.h> | |
37 | #include <TH2D.h> | |
38 | #include <TLinearFitter.h> | |
e4f2f73d | 39 | #include <TROOT.h> |
40 | #include <TTree.h> | |
41 | #include <TClonesArray.h> | |
42 | #include <TRandom.h> | |
43 | #include <TTreeStream.h> | |
44 | ||
45 | #include "AliLog.h" | |
46 | #include "AliESDEvent.h" | |
47 | #include "AliAlignObj.h" | |
48 | #include "AliRieman.h" | |
49 | #include "AliTrackPointArray.h" | |
50 | ||
e4f2f73d | 51 | #include "AliTRDtrackerV1.h" |
eb38ed55 | 52 | #include "AliTRDtrackingChamber.h" |
e4f2f73d | 53 | #include "AliTRDgeometry.h" |
54 | #include "AliTRDpadPlane.h" | |
55 | #include "AliTRDgeometry.h" | |
56 | #include "AliTRDcluster.h" | |
57 | #include "AliTRDtrack.h" | |
58 | #include "AliTRDseed.h" | |
59 | #include "AliTRDcalibDB.h" | |
60 | #include "AliTRDCommonParam.h" | |
61 | #include "AliTRDReconstructor.h" | |
62 | #include "AliTRDCalibraFillHisto.h" | |
eb38ed55 | 63 | #include "AliTRDchamberTimeBin.h" |
e4f2f73d | 64 | #include "AliTRDrecoParam.h" |
65 | #include "AliTRDseedV1.h" | |
0906e73e | 66 | #include "AliTRDtrackV1.h" |
67 | #include "Cal/AliTRDCalDet.h" | |
e4f2f73d | 68 | |
e4f2f73d | 69 | |
70 | ClassImp(AliTRDtrackerV1) | |
eb38ed55 | 71 | |
72 | ||
73 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // | |
74 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // | |
75 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // | |
76 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle | |
77 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation | |
d76231c8 | 78 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
e4f2f73d | 79 | 0.1112, 0.1112, 0.1112, 0.0786, 0.0786, |
80 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, | |
81 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 | |
82 | }; | |
2985ffcb | 83 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
eb38ed55 | 84 | TTreeSRedirector *AliTRDtrackerV1::fgDebugStreamer = 0x0; |
85 | AliRieman* AliTRDtrackerV1::fgRieman = 0x0; | |
86 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0; | |
87 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0; | |
e4f2f73d | 88 | |
89 | //____________________________________________________________________ | |
eb38ed55 | 90 | AliTRDtrackerV1::AliTRDtrackerV1() |
91 | :AliTracker() | |
92 | ,fGeom(new AliTRDgeometry()) | |
93 | ,fClusters(0x0) | |
0906e73e | 94 | ,fTracklets(0x0) |
eb38ed55 | 95 | ,fTracks(0x0) |
e4f2f73d | 96 | ,fSieveSeeding(0) |
e4f2f73d | 97 | { |
98 | // | |
eb38ed55 | 99 | // Default constructor. |
100 | // | |
101 | if (!AliTRDcalibDB::Instance()) { | |
102 | AliFatal("Could not get calibration object"); | |
103 | } | |
2985ffcb | 104 | fgNTimeBins = AliTRDcalibDB::Instance()->GetNumberOfTimeBins(); |
e4f2f73d | 105 | |
2985ffcb | 106 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsect; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
e4f2f73d | 107 | |
eb38ed55 | 108 | if(AliTRDReconstructor::StreamLevel() > 1){ |
109 | TDirectory *savedir = gDirectory; | |
110 | fgDebugStreamer = new TTreeSRedirector("TRD.TrackerDebug.root"); | |
111 | savedir->cd(); | |
112 | } | |
113 | } | |
114 | ||
e4f2f73d | 115 | //____________________________________________________________________ |
116 | AliTRDtrackerV1::~AliTRDtrackerV1() | |
117 | { | |
118 | // | |
119 | // Destructor | |
120 | // | |
eb38ed55 | 121 | |
122 | if(fgDebugStreamer) delete fgDebugStreamer; | |
123 | if(fgRieman) delete fgRieman; | |
124 | if(fgTiltedRieman) delete fgTiltedRieman; | |
125 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; | |
126 | if(fTracks) {fTracks->Delete(); delete fTracks;} | |
0906e73e | 127 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} |
eb38ed55 | 128 | if(fClusters) {fClusters->Delete(); delete fClusters;} |
129 | if(fGeom) delete fGeom; | |
e4f2f73d | 130 | } |
131 | ||
132 | //____________________________________________________________________ | |
133 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) | |
134 | { | |
135 | // | |
136 | // Steering stand alone tracking for full TRD detector | |
137 | // | |
138 | // Parameters : | |
139 | // esd : The ESD event. On output it contains | |
140 | // the ESD tracks found in TRD. | |
141 | // | |
142 | // Output : | |
143 | // Number of tracks found in the TRD detector. | |
144 | // | |
145 | // Detailed description | |
146 | // 1. Launch individual SM trackers. | |
147 | // See AliTRDtrackerV1::Clusters2TracksSM() for details. | |
148 | // | |
149 | ||
eb38ed55 | 150 | if(!AliTRDReconstructor::RecoParam()){ |
151 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); | |
e4f2f73d | 152 | return 0; |
153 | } | |
154 | ||
155 | //AliInfo("Start Track Finder ..."); | |
156 | Int_t ntracks = 0; | |
eb38ed55 | 157 | for(int ism=0; ism<AliTRDgeometry::kNsect; ism++){ |
158 | // for(int ism=1; ism<2; ism++){ | |
e4f2f73d | 159 | //AliInfo(Form("Processing supermodule %i ...", ism)); |
eb38ed55 | 160 | ntracks += Clusters2TracksSM(ism, esd); |
e4f2f73d | 161 | } |
eb38ed55 | 162 | AliInfo(Form("Number of found tracks : %d", ntracks)); |
e4f2f73d | 163 | return ntracks; |
164 | } | |
165 | ||
0906e73e | 166 | |
167 | //_____________________________________________________________________________ | |
eb38ed55 | 168 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
0906e73e | 169 | { |
170 | //AliInfo(Form("Asking for tracklet %d", index)); | |
171 | ||
172 | if(index<0) return kFALSE; | |
eb38ed55 | 173 | AliTRDseedV1 *tracklet = 0x0; |
174 | if(!(tracklet = (AliTRDseedV1*)fTracklets->UncheckedAt(index))) return kFALSE; | |
175 | ||
176 | // get detector for this tracklet | |
177 | AliTRDcluster *cl = 0x0; | |
178 | Int_t ic = 0; do; while(!(cl = tracklet->GetClusters(ic++))); | |
179 | Int_t idet = cl->GetDetector(); | |
180 | ||
181 | Double_t local[3]; | |
182 | local[0] = tracklet->GetX0(); | |
183 | local[1] = tracklet->GetYfit(0); | |
184 | local[2] = tracklet->GetZfit(0); | |
185 | Double_t global[3]; | |
186 | fGeom->RotateBack(idet, local, global); | |
187 | p.SetXYZ(global[0],global[1],global[2]); | |
188 | ||
189 | ||
190 | // setting volume id | |
191 | AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1; | |
192 | switch (fGeom->GetPlane(idet)) { | |
193 | case 0: | |
194 | iLayer = AliGeomManager::kTRD1; | |
195 | break; | |
196 | case 1: | |
197 | iLayer = AliGeomManager::kTRD2; | |
198 | break; | |
199 | case 2: | |
200 | iLayer = AliGeomManager::kTRD3; | |
201 | break; | |
202 | case 3: | |
203 | iLayer = AliGeomManager::kTRD4; | |
204 | break; | |
205 | case 4: | |
206 | iLayer = AliGeomManager::kTRD5; | |
207 | break; | |
208 | case 5: | |
209 | iLayer = AliGeomManager::kTRD6; | |
210 | break; | |
211 | }; | |
212 | Int_t modId = fGeom->GetSector(idet) * fGeom->Ncham() + fGeom->GetChamber(idet); | |
213 | UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId); | |
214 | p.SetVolumeID(volid); | |
215 | ||
0906e73e | 216 | return kTRUE; |
217 | } | |
218 | ||
eb38ed55 | 219 | //____________________________________________________________________ |
220 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() | |
221 | { | |
222 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); | |
223 | return fgTiltedRieman; | |
224 | } | |
0906e73e | 225 | |
eb38ed55 | 226 | //____________________________________________________________________ |
227 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() | |
228 | { | |
229 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); | |
230 | return fgTiltedRiemanConstrained; | |
231 | } | |
232 | ||
233 | //____________________________________________________________________ | |
234 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() | |
235 | { | |
236 | if(!fgRieman) fgRieman = new AliRieman(AliTRDtrackingChamber::kNTimeBins * AliTRDgeometry::kNplan); | |
237 | return fgRieman; | |
238 | } | |
239 | ||
0906e73e | 240 | //_____________________________________________________________________________ |
241 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) | |
242 | { | |
243 | // | |
244 | // Gets seeds from ESD event. The seeds are AliTPCtrack's found and | |
245 | // backpropagated by the TPC tracker. Each seed is first propagated | |
246 | // to the TRD, and then its prolongation is searched in the TRD. | |
247 | // If sufficiently long continuation of the track is found in the TRD | |
248 | // the track is updated, otherwise it's stored as originaly defined | |
249 | // by the TPC tracker. | |
250 | // | |
251 | ||
252 | Int_t found = 0; // number of tracks found | |
253 | Float_t foundMin = 20.0; | |
254 | ||
0906e73e | 255 | Int_t nSeed = event->GetNumberOfTracks(); |
256 | if(!nSeed){ | |
257 | // run stand alone tracking | |
258 | if (AliTRDReconstructor::SeedingOn()) Clusters2Tracks(event); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | Float_t *quality = new Float_t[nSeed]; | |
263 | Int_t *index = new Int_t[nSeed]; | |
264 | for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) { | |
265 | AliESDtrack *seed = event->GetTrack(iSeed); | |
266 | Double_t covariance[15]; | |
267 | seed->GetExternalCovariance(covariance); | |
268 | quality[iSeed] = covariance[0] + covariance[2]; | |
269 | } | |
270 | // Sort tracks according to covariance of local Y and Z | |
271 | TMath::Sort(nSeed,quality,index,kFALSE); | |
272 | ||
273 | // Backpropagate all seeds | |
274 | for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) { | |
275 | ||
276 | // Get the seeds in sorted sequence | |
277 | AliESDtrack *seed = event->GetTrack(index[iSeed]); | |
278 | ||
279 | // Check the seed status | |
280 | ULong_t status = seed->GetStatus(); | |
281 | if ((status & AliESDtrack::kTPCout) == 0) continue; | |
282 | if ((status & AliESDtrack::kTRDout) != 0) continue; | |
283 | ||
284 | // Do the back prolongation | |
285 | Int_t lbl = seed->GetLabel(); | |
286 | AliTRDtrackV1 *track = new AliTRDtrackV1(*seed); | |
287 | //track->Print(); | |
288 | track->SetSeedLabel(lbl); | |
289 | seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); // Make backup | |
0906e73e | 290 | Float_t p4 = track->GetC(); |
291 | Int_t expectedClr = FollowBackProlongation(*track); | |
292 | //AliInfo(Form("\nTRACK %d Clusters %d [%d] in chi2 %f", index[iSeed], expectedClr, track->GetNumberOfClusters(), track->GetChi2())); | |
293 | //track->Print(); | |
294 | ||
295 | //Double_t cov[15]; | |
296 | //seed->GetExternalCovariance(cov); | |
297 | //AliInfo(Form("track %d cov[%f %f] 0", index[iSeed], cov[0], cov[2])); | |
298 | ||
299 | if ((TMath::Abs(track->GetC() - p4) / TMath::Abs(p4) < 0.2) || | |
300 | (track->Pt() > 0.8)) { | |
301 | // | |
302 | // Make backup for back propagation | |
303 | // | |
304 | Int_t foundClr = track->GetNumberOfClusters(); | |
305 | if (foundClr >= foundMin) { | |
306 | //AliInfo(Form("Making backup track ncls [%d]...", foundClr)); | |
307 | track->CookdEdx(); | |
308 | track->CookdEdxTimBin(seed->GetID()); // A.Bercuci 25.07.07 | |
309 | CookLabel(track,1 - fgkLabelFraction); | |
310 | if (track->GetBackupTrack()) UseClusters(track->GetBackupTrack()); | |
311 | ||
312 | ||
313 | //seed->GetExternalCovariance(cov); | |
314 | //AliInfo(Form("track %d cov[%f %f] 0 test", index[iSeed], cov[0], cov[2])); | |
315 | ||
316 | // Sign only gold tracks | |
317 | if (track->GetChi2() / track->GetNumberOfClusters() < 4) { | |
318 | if ((seed->GetKinkIndex(0) == 0) && | |
319 | (track->Pt() < 1.5)) UseClusters(track); | |
320 | } | |
321 | Bool_t isGold = kFALSE; | |
322 | ||
323 | // Full gold track | |
324 | if (track->GetChi2() / track->GetNumberOfClusters() < 5) { | |
325 | if (track->GetBackupTrack()) seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup); | |
326 | ||
327 | isGold = kTRUE; | |
328 | } | |
329 | //seed->GetExternalCovariance(cov); | |
330 | //AliInfo(Form("track %d cov[%f %f] 00", index[iSeed], cov[0], cov[2])); | |
331 | ||
332 | // Almost gold track | |
333 | if ((!isGold) && (track->GetNCross() == 0) && | |
334 | (track->GetChi2() / track->GetNumberOfClusters() < 7)) { | |
335 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); | |
336 | if (track->GetBackupTrack()) seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup); | |
337 | ||
338 | isGold = kTRUE; | |
339 | } | |
340 | //seed->GetExternalCovariance(cov); | |
341 | //AliInfo(Form("track %d cov[%f %f] 01", index[iSeed], cov[0], cov[2])); | |
342 | ||
343 | if ((!isGold) && (track->GetBackupTrack())) { | |
344 | if ((track->GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track->GetBackupTrack()->GetChi2()/(track->GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { | |
345 | seed->UpdateTrackParams(track->GetBackupTrack(),AliESDtrack::kTRDbackup); | |
346 | isGold = kTRUE; | |
347 | } | |
348 | } | |
349 | //seed->GetExternalCovariance(cov); | |
350 | //AliInfo(Form("track %d cov[%f %f] 02", index[iSeed], cov[0], cov[2])); | |
351 | ||
352 | //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) { | |
353 | //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup); | |
354 | //} | |
355 | } | |
356 | } | |
357 | /**/ | |
358 | ||
359 | /**/ | |
360 | // Debug part of tracking | |
eb38ed55 | 361 | /* TTreeSRedirector &cstream = *fgDebugStreamer; |
0906e73e | 362 | Int_t eventNrInFile = event->GetEventNumberInFile(); // This is most likely NOT the event number you'd like to use. It has nothing to do with the 'real' event number. |
363 | if (AliTRDReconstructor::StreamLevel() > 0) { | |
364 | if (track->GetBackupTrack()) { | |
365 | cstream << "Tracks" | |
366 | << "EventNrInFile=" << eventNrInFile | |
367 | << "ESD.=" << seed | |
368 | << "trd.=" << track | |
369 | << "trdback.=" << track->GetBackupTrack() | |
370 | << "\n"; | |
371 | } | |
372 | else { | |
373 | cstream << "Tracks" | |
374 | << "EventNrInFile=" << eventNrInFile | |
375 | << "ESD.=" << seed | |
376 | << "trd.=" << track | |
377 | << "trdback.=" << track | |
378 | << "\n"; | |
379 | } | |
380 | }*/ | |
381 | /**/ | |
382 | ||
383 | //seed->GetExternalCovariance(cov); | |
384 | //AliInfo(Form("track %d cov[%f %f] 1", index[iSeed], cov[0], cov[2])); | |
385 | ||
386 | // Propagation to the TOF (I.Belikov) | |
387 | if (track->GetStop() == kFALSE) { | |
388 | //AliInfo("Track not stopped in TRD ..."); | |
389 | Double_t xtof = 371.0; | |
390 | Double_t xTOF0 = 370.0; | |
391 | ||
392 | Double_t c2 = track->GetSnp() + track->GetC() * (xtof - track->GetX()); | |
393 | if (TMath::Abs(c2) >= 0.99) { | |
394 | delete track; | |
395 | continue; | |
396 | } | |
397 | ||
398 | PropagateToX(*track,xTOF0,fgkMaxStep); | |
399 | ||
400 | // Energy losses taken to the account - check one more time | |
401 | c2 = track->GetSnp() + track->GetC() * (xtof - track->GetX()); | |
402 | if (TMath::Abs(c2) >= 0.99) { | |
403 | delete track; | |
404 | continue; | |
405 | } | |
406 | ||
407 | //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) { | |
408 | // fHBackfit->Fill(7); | |
409 | //delete track; | |
410 | // continue; | |
411 | //} | |
412 | ||
413 | Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha()); | |
414 | Double_t y; | |
415 | track->GetYAt(xtof,GetBz(),y); | |
416 | if (y > ymax) { | |
417 | if (!track->Rotate( AliTRDgeometry::GetAlpha())) { | |
418 | delete track; | |
419 | continue; | |
420 | } | |
421 | }else if (y < -ymax) { | |
422 | if (!track->Rotate(-AliTRDgeometry::GetAlpha())) { | |
423 | delete track; | |
424 | continue; | |
425 | } | |
426 | } | |
427 | ||
428 | if (track->PropagateTo(xtof)) { | |
429 | //AliInfo("set kTRDout"); | |
430 | seed->UpdateTrackParams(track,AliESDtrack::kTRDout); | |
431 | ||
432 | for (Int_t i = 0; i < AliESDtrack::kNPlane; i++) { | |
433 | for (Int_t j = 0; j < AliESDtrack::kNSlice; j++) { | |
434 | seed->SetTRDsignals(track->GetPIDsignals(i,j),i,j); | |
435 | } | |
436 | seed->SetTRDTimBin(track->GetPIDTimBin(i),i); | |
437 | } | |
438 | //seed->SetTRDtrack(new AliTRDtrack(*track)); | |
439 | if (track->GetNumberOfClusters() > foundMin) found++; | |
440 | } | |
441 | } else { | |
442 | //AliInfo("Track stopped in TRD ..."); | |
443 | ||
444 | if ((track->GetNumberOfClusters() > 15) && | |
445 | (track->GetNumberOfClusters() > 0.5*expectedClr)) { | |
446 | seed->UpdateTrackParams(track,AliESDtrack::kTRDout); | |
447 | ||
448 | //seed->SetStatus(AliESDtrack::kTRDStop); | |
449 | for (Int_t i = 0; i < AliESDtrack::kNPlane; i++) { | |
450 | for (Int_t j = 0; j <AliESDtrack::kNSlice; j++) { | |
451 | seed->SetTRDsignals(track->GetPIDsignals(i,j),i,j); | |
452 | } | |
453 | seed->SetTRDTimBin(track->GetPIDTimBin(i),i); | |
454 | } | |
455 | //seed->SetTRDtrack(new AliTRDtrack(*track)); | |
456 | found++; | |
457 | } | |
458 | } | |
459 | ||
460 | //if (((t->GetStatus()&AliESDtrack::kTRDout)!=0 ) | |
461 | ||
462 | seed->SetTRDQuality(track->StatusForTOF()); | |
463 | seed->SetTRDBudget(track->GetBudget(0)); | |
0906e73e | 464 | delete track; |
0906e73e | 465 | } |
466 | ||
467 | ||
eb38ed55 | 468 | AliInfo(Form("Number of seeds: %d", nSeed)); |
469 | AliInfo(Form("Number of back propagated TRD tracks: %d", found)); | |
470 | ||
0906e73e | 471 | delete [] index; |
472 | delete [] quality; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | ||
478 | //____________________________________________________________________ | |
479 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) | |
480 | { | |
481 | // | |
482 | // Refits tracks within the TRD. The ESD event is expected to contain seeds | |
483 | // at the outer part of the TRD. | |
484 | // The tracks are propagated to the innermost time bin | |
485 | // of the TRD and the ESD event is updated | |
486 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) | |
487 | // | |
488 | ||
489 | Int_t nseed = 0; // contor for loaded seeds | |
490 | Int_t found = 0; // contor for updated TRD tracks | |
bcb6fb78 | 491 | |
492 | // Calibration monitor | |
493 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); | |
494 | if (!calibra) AliInfo("Could not get Calibra instance\n"); | |
495 | ||
496 | ||
0906e73e | 497 | AliTRDtrackV1 track; |
498 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { | |
499 | AliESDtrack *seed = event->GetTrack(itrack); | |
500 | new(&track) AliTRDtrackV1(*seed); | |
501 | ||
502 | if (track.GetX() < 270.0) { | |
503 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
504 | //AliInfo(Form("Remove for X = %7.3f [270.]\n", track.GetX())); | |
505 | continue; | |
506 | } | |
507 | ||
508 | ULong_t status = seed->GetStatus(); | |
509 | if((status & AliESDtrack::kTRDout) == 0) continue; | |
510 | if((status & AliESDtrack::kTRDin) != 0) continue; | |
511 | nseed++; | |
512 | ||
513 | track.ResetCovariance(50.0); | |
514 | ||
515 | // do the propagation and processing | |
bcb6fb78 | 516 | Bool_t kUPDATE = kFALSE; |
517 | Double_t xTPC = 250.0; | |
518 | if(FollowProlongation(track)){ | |
519 | // computes PID for track | |
520 | track.CookPID(); | |
521 | // update calibration references using this track | |
522 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); | |
523 | ||
524 | // Prolongate to TPC | |
525 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update | |
526 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); | |
527 | track.UpdateESDtrack(seed); | |
528 | // Add TRD track to ESDfriendTrack | |
529 | if (AliTRDReconstructor::StreamLevel() > 0 /*&& quality TODO*/){ | |
530 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); | |
531 | calibTrack->SetOwner(); | |
532 | seed->AddCalibObject(calibTrack); | |
533 | } | |
534 | found++; | |
535 | kUPDATE = kTRUE; | |
0906e73e | 536 | } |
bcb6fb78 | 537 | } |
538 | ||
539 | // Prolongate to TPC without update | |
540 | if(!kUPDATE) { | |
0906e73e | 541 | AliTRDtrackV1 tt(*seed); |
542 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDrefit); | |
543 | } | |
544 | } | |
545 | AliInfo(Form("Number of loaded seeds: %d",nseed)); | |
546 | AliInfo(Form("Number of found tracks from loaded seeds: %d",found)); | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | ||
552 | //____________________________________________________________________ | |
553 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) | |
554 | { | |
555 | // Extrapolates the TRD track in the TPC direction. | |
556 | // | |
557 | // Parameters | |
558 | // t : the TRD track which has to be extrapolated | |
559 | // | |
560 | // Output | |
561 | // number of clusters attached to the track | |
562 | // | |
563 | // Detailed description | |
564 | // | |
565 | // Starting from current radial position of track <t> this function | |
566 | // extrapolates the track through the 6 TRD layers. The following steps | |
567 | // are being performed for each plane: | |
568 | // 1. prepare track: | |
569 | // a. get plane limits in the local x direction | |
570 | // b. check crossing sectors | |
571 | // c. check track inclination | |
572 | // 2. search tracklet in the tracker list (see GetTracklet() for details) | |
573 | // 3. evaluate material budget using the geo manager | |
574 | // 4. propagate and update track using the tracklet information. | |
575 | // | |
576 | // Debug level 2 | |
577 | // | |
578 | ||
579 | //AliInfo(""); | |
580 | Int_t nClustersExpected = 0; | |
581 | Int_t lastplane = 5; //GetLastPlane(&t); | |
582 | for (Int_t iplane = lastplane; iplane >= 0; iplane--) { | |
eb38ed55 | 583 | Int_t index = 0; |
584 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); | |
585 | if(!tracklet) continue; | |
586 | if(!tracklet->IsOK()) AliWarning("tracklet not OK"); | |
587 | ||
588 | t.SetTracklet(tracklet, iplane, index); | |
589 | ||
590 | Double_t x = tracklet->GetX0(); | |
591 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; | |
0906e73e | 592 | if (!AdjustSector(&t)) break; |
593 | ||
0906e73e | 594 | // Start global position |
595 | Double_t xyz0[3]; | |
596 | t.GetXYZ(xyz0); | |
597 | ||
598 | // End global position | |
eb38ed55 | 599 | Double_t alpha = t.GetAlpha(), y, z; |
0906e73e | 600 | if (!t.GetProlongation(x,y,z)) break; |
601 | Double_t xyz1[3]; | |
eb38ed55 | 602 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
603 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
0906e73e | 604 | xyz1[2] = z; |
eb38ed55 | 605 | |
0906e73e | 606 | // Get material budget |
607 | Double_t param[7]; | |
eb38ed55 | 608 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); |
0906e73e | 609 | Double_t xrho= param[0]*param[4]; |
610 | Double_t xx0 = param[1]; // Get mean propagation parameters | |
611 | ||
eb38ed55 | 612 | // Propagate and update |
613 | t.PropagateTo(x, xx0, xrho); | |
0906e73e | 614 | if (!AdjustSector(&t)) break; |
615 | ||
616 | Double_t maxChi2 = t.GetPredictedChi2(tracklet); | |
617 | if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){ | |
618 | nClustersExpected += tracklet->GetN(); | |
619 | } | |
620 | } | |
621 | ||
0906e73e | 622 | if(AliTRDReconstructor::StreamLevel() > 1){ |
623 | Int_t index; | |
624 | for(int iplane=0; iplane<6; iplane++){ | |
625 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); | |
626 | if(!tracklet) continue; | |
627 | t.SetTracklet(tracklet, iplane, index); | |
628 | } | |
629 | ||
eb38ed55 | 630 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
0906e73e | 631 | cstreamer << "FollowProlongation" |
632 | << "ncl=" << nClustersExpected | |
633 | << "track.=" << &t | |
634 | << "\n"; | |
635 | } | |
0906e73e | 636 | |
637 | return nClustersExpected; | |
638 | ||
639 | } | |
640 | ||
641 | //_____________________________________________________________________________ | |
642 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) | |
643 | { | |
644 | // Extrapolates the TRD track in the TOF direction. | |
645 | // | |
646 | // Parameters | |
647 | // t : the TRD track which has to be extrapolated | |
648 | // | |
649 | // Output | |
650 | // number of clusters attached to the track | |
651 | // | |
652 | // Detailed description | |
653 | // | |
654 | // Starting from current radial position of track <t> this function | |
655 | // extrapolates the track through the 6 TRD layers. The following steps | |
656 | // are being performed for each plane: | |
657 | // 1. prepare track: | |
658 | // a. get plane limits in the local x direction | |
659 | // b. check crossing sectors | |
660 | // c. check track inclination | |
661 | // 2. build tracklet (see AliTRDseed::AttachClusters() for details) | |
662 | // 3. evaluate material budget using the geo manager | |
663 | // 4. propagate and update track using the tracklet information. | |
664 | // | |
665 | // Debug level 2 | |
666 | // | |
667 | ||
668 | Int_t nClustersExpected = 0; | |
eb38ed55 | 669 | Double_t clength = AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); |
670 | AliTRDtrackingChamber *chamber = 0x0; | |
671 | ||
0906e73e | 672 | // Loop through the TRD planes |
673 | for (Int_t iplane = 0; iplane < AliTRDgeometry::Nplan(); iplane++) { | |
eb38ed55 | 674 | // BUILD TRACKLET IF NOT ALREADY BUILT |
675 | Double_t x = 0., y, z, alpha; | |
676 | AliTRDseedV1 tracklet(*t.GetTracklet(iplane)); | |
677 | if(!tracklet.IsOK()){ | |
678 | alpha = t.GetAlpha(); | |
679 | Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsect)); | |
0906e73e | 680 | |
eb38ed55 | 681 | if(!fTrSec[sector].GetNChambers()) continue; |
682 | ||
683 | if((x = fTrSec[sector].GetX(iplane)) < 1.) continue; | |
684 | ||
685 | if (!t.GetProlongation(x, y, z)) break; | |
686 | Int_t stack = fGeom->GetChamber(z, iplane); | |
687 | Int_t nCandidates = stack >= 0 ? 1 : 2; | |
688 | z -= stack >= 0 ? 0. : 4.; | |
689 | ||
690 | for(int icham=0; icham<nCandidates; icham++, z+=8){ | |
691 | if((stack = fGeom->GetChamber(z, iplane)) < 0) continue; | |
692 | ||
693 | if(!(chamber = fTrSec[sector].GetChamber(stack, iplane))) continue; | |
694 | ||
2985ffcb | 695 | if(chamber->GetNClusters() < fgNTimeBins*AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue; |
eb38ed55 | 696 | |
697 | x = chamber->GetX(); | |
698 | ||
699 | AliTRDpadPlane *pp = fGeom->GetPadPlane(iplane, stack); | |
700 | tracklet.SetTilt(TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle())); | |
701 | tracklet.SetPadLength(pp->GetLengthIPad()); | |
702 | tracklet.SetPlane(iplane); | |
703 | tracklet.SetX0(x); | |
704 | tracklet.Init(&t); | |
705 | if(!tracklet.AttachClustersIter(chamber, 1000.)) continue; | |
706 | tracklet.Init(&t); | |
707 | ||
2985ffcb | 708 | if(tracklet.GetN() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue; |
eb38ed55 | 709 | |
710 | break; | |
711 | } | |
712 | } | |
713 | if(!tracklet.IsOK()){ | |
714 | if(x < 1.) continue; //temporary | |
715 | if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break; | |
716 | if(!AdjustSector(&t)) break; | |
717 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) break; | |
718 | continue; | |
719 | } | |
0906e73e | 720 | |
721 | // Propagate closer to the current chamber if neccessary | |
eb38ed55 | 722 | x -= clength; |
723 | if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) break; | |
0906e73e | 724 | if (!AdjustSector(&t)) break; |
0906e73e | 725 | if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) break; |
0906e73e | 726 | |
727 | // load tracklet to the tracker and the track | |
728 | Int_t index = SetTracklet(&tracklet); | |
729 | t.SetTracklet(&tracklet, iplane, index); | |
eb38ed55 | 730 | |
731 | ||
0906e73e | 732 | // Calculate the mean material budget along the path inside the chamber |
eb38ed55 | 733 | //Calculate global entry and exit positions of the track in chamber (only track prolongation) |
734 | Double_t xyz0[3]; // entry point | |
735 | t.GetXYZ(xyz0); | |
736 | alpha = t.GetAlpha(); | |
737 | x = tracklet.GetX0(); | |
738 | if (!t.GetProlongation(x, y, z)) break; | |
739 | Double_t xyz1[3]; // exit point | |
740 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
741 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
742 | xyz1[2] = z; | |
0906e73e | 743 | Double_t param[7]; |
744 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); | |
745 | // The mean propagation parameters | |
746 | Double_t xrho = param[0]*param[4]; // density*length | |
747 | Double_t xx0 = param[1]; // radiation length | |
748 | ||
749 | // Propagate and update track | |
eb38ed55 | 750 | t.PropagateTo(x, xx0, xrho); |
0906e73e | 751 | if (!AdjustSector(&t)) break; |
752 | Double_t maxChi2 = t.GetPredictedChi2(&tracklet); | |
753 | if (maxChi2<1e+10 && t.Update(&tracklet, maxChi2)){ | |
eb38ed55 | 754 | nClustersExpected += tracklet.GetN(); |
0906e73e | 755 | } |
756 | // Reset material budget if 2 consecutive gold | |
eb38ed55 | 757 | if(iplane>0 && tracklet.GetN() + t.GetTracklet(iplane-1)->GetN() > 20) t.SetBudget(2, 0.); |
0906e73e | 758 | |
759 | // Make backup of the track until is gold | |
760 | // TO DO update quality check of the track. | |
761 | // consider comparison with fTimeBinsRange | |
2985ffcb | 762 | Float_t ratio0 = tracklet.GetN() / Float_t(fgNTimeBins); |
0906e73e | 763 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); |
764 | //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2()); | |
765 | //printf("ratio0 %f [> 0.8]\n", ratio0); | |
766 | //printf("ratio1 %f [> 0.6]\n", ratio1); | |
767 | //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1); | |
768 | //printf("t.GetNCross() %d [== 0]\n", t.GetNCross()); | |
769 | //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp())); | |
770 | //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters()); | |
771 | ||
772 | if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update | |
773 | (ratio0 > 0.8) && | |
774 | //(ratio1 > 0.6) && | |
775 | //(ratio0+ratio1 > 1.5) && | |
776 | (t.GetNCross() == 0) && | |
777 | (TMath::Abs(t.GetSnp()) < 0.85) && | |
778 | (t.GetNumberOfClusters() > 20)) t.MakeBackupTrack(); | |
779 | ||
780 | } // end planes loop | |
781 | ||
0906e73e | 782 | if(AliTRDReconstructor::StreamLevel() > 1){ |
eb38ed55 | 783 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
0906e73e | 784 | cstreamer << "FollowBackProlongation" |
785 | << "ncl=" << nClustersExpected | |
786 | << "track.=" << &t | |
787 | << "\n"; | |
788 | } | |
0906e73e | 789 | |
790 | return nClustersExpected; | |
791 | } | |
792 | ||
eb38ed55 | 793 | //_________________________________________________________________________ |
794 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){ | |
795 | // | |
796 | // Fits a Riemann-circle to the given points without tilting pad correction. | |
797 | // The fit is performed using an instance of the class AliRieman (equations | |
798 | // and transformations see documentation of this class) | |
799 | // Afterwards all the tracklets are Updated | |
800 | // | |
801 | // Parameters: - Array of tracklets (AliTRDseedV1) | |
802 | // - Storage for the chi2 values (beginning with direction z) | |
803 | // - Seeding configuration | |
804 | // Output: - The curvature | |
805 | // | |
806 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
807 | fitter->Reset(); | |
808 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; | |
809 | Int_t *ppl = &allplanes[0]; | |
810 | Int_t maxLayers = 6; | |
811 | if(planes){ | |
812 | maxLayers = 4; | |
813 | ppl = planes; | |
814 | } | |
815 | for(Int_t il = 0; il < maxLayers; il++){ | |
816 | if(!tracklets[ppl[il]].IsOK()) continue; | |
817 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfitR(0), tracklets[ppl[il]].GetZProb(),1,10); | |
818 | } | |
819 | fitter->Update(); | |
820 | // Set the reference position of the fit and calculate the chi2 values | |
821 | memset(chi2, 0, sizeof(Double_t) * 2); | |
822 | for(Int_t il = 0; il < maxLayers; il++){ | |
823 | // Reference positions | |
824 | tracklets[ppl[il]].Init(fitter); | |
825 | ||
826 | // chi2 | |
827 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; | |
828 | chi2[0] += tracklets[ppl[il]].GetChi2Z(); | |
829 | chi2[1] += tracklets[ppl[il]].GetChi2Y(); | |
830 | } | |
831 | return fitter->GetC(); | |
832 | } | |
833 | ||
834 | //_________________________________________________________________________ | |
835 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) | |
836 | { | |
837 | // | |
838 | // Performs a Riemann helix fit using the seedclusters as spacepoints | |
839 | // Afterwards the chi2 values are calculated and the seeds are updated | |
840 | // | |
841 | // Parameters: - The four seedclusters | |
842 | // - The tracklet array (AliTRDseedV1) | |
843 | // - The seeding configuration | |
844 | // - Chi2 array | |
845 | // | |
846 | // debug level 2 | |
847 | // | |
848 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
849 | fitter->Reset(); | |
850 | for(Int_t i = 0; i < 4; i++) | |
851 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10); | |
852 | fitter->Update(); | |
853 | ||
854 | ||
855 | // Update the seed and calculated the chi2 value | |
856 | chi2[0] = 0; chi2[1] = 0; | |
857 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ | |
858 | // chi2 | |
859 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); | |
860 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); | |
861 | } | |
862 | } | |
863 | ||
864 | ||
865 | //_________________________________________________________________________ | |
866 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) | |
867 | { | |
868 | // | |
869 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is | |
870 | // assumed that the vertex position is set to 0. | |
871 | // This method is very usefull for high-pt particles | |
872 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 | |
873 | // x0, y0: Center of the circle | |
874 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) | |
875 | // zc: center of the pad row | |
876 | // Equation which has to be fitted (after transformation): | |
877 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 | |
878 | // Transformation: | |
879 | // t = 1/(x^2 + y^2) | |
880 | // u = 2 * x * t | |
881 | // v = 2 * x * tan(phiT) * t | |
882 | // Parameters in the equation: | |
883 | // a = -1/y0, b = x0/y0, e = dz/dx | |
884 | // | |
885 | // The Curvature is calculated by the following equation: | |
886 | // - curv = a/Sqrt(b^2 + 1) = 1/R | |
887 | // Parameters: - the 6 tracklets | |
888 | // - the Vertex constraint | |
889 | // Output: - the Chi2 value of the track | |
890 | // | |
891 | // debug level 5 | |
892 | // | |
893 | ||
eb38ed55 | 894 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); |
895 | fitter->StoreData(kTRUE); | |
896 | fitter->ClearPoints(); | |
897 | ||
898 | Float_t x, y, z, w, t, error, tilt; | |
899 | Double_t uvt[2]; | |
900 | Int_t nPoints = 0; | |
901 | for(Int_t ipl = 0; ipl < AliTRDgeometry::kNplan; ipl++){ | |
902 | if(!tracklets[ipl].IsOK()) continue; | |
2985ffcb | 903 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
eb38ed55 | 904 | if(!tracklets[ipl].IsUsable(itb)) continue; |
905 | x = tracklets[ipl].GetX(itb) + tracklets[ipl].GetX0(); | |
906 | y = tracklets[ipl].GetY(itb); | |
907 | z = tracklets[ipl].GetZ(itb); | |
908 | tilt = tracklets[ipl].GetTilt(); | |
909 | // Transformation | |
910 | t = 1/(x * x + y * y); | |
911 | uvt[0] = 2 * x* t; | |
912 | uvt[1] = 2.0 * tilt * x * t; | |
913 | w = 2.0 * (y + tilt * (z - zVertex)) * t; | |
914 | error = 2 * 0.2 * t; | |
915 | fitter->AddPoint(uvt, w, error); | |
916 | nPoints++; | |
917 | } | |
918 | } | |
919 | fitter->Eval(); | |
920 | ||
921 | // Calculate curvature | |
922 | Double_t a = fitter->GetParameter(0); | |
923 | Double_t b = fitter->GetParameter(0); | |
924 | Double_t curvature = a/TMath::Sqrt(b*b + 1); | |
925 | ||
926 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
927 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) | |
928 | tracklets[ip].SetCC(curvature); | |
929 | ||
930 | if(AliTRDReconstructor::StreamLevel() >= 5){ | |
931 | //Linear Model on z-direction | |
932 | Double_t xref = (tracklets[2].GetX0() + tracklets[3].GetX0())/2; // Relative to the middle of the stack | |
933 | Double_t slope = fitter->GetParameter(2); | |
934 | Double_t zref = slope * xref; | |
935 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope); | |
936 | TTreeSRedirector &treeStreamer = *fgDebugStreamer; | |
937 | treeStreamer << "FitTiltedRiemanConstraint" | |
938 | << "Curvature=" << curvature | |
939 | << "Chi2Track=" << chi2track | |
940 | << "Chi2Z=" << chi2Z | |
941 | << "zref=" << zref | |
942 | << "\n"; | |
943 | } | |
944 | return chi2track; | |
945 | } | |
946 | ||
947 | //_________________________________________________________________________ | |
948 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) | |
949 | { | |
950 | // | |
951 | // Performs a Riemann fit taking tilting pad correction into account | |
952 | // The equation of a Riemann circle, where the y position is substituted by the | |
953 | // measured y-position taking pad tilting into account, has to be transformed | |
954 | // into a 4-dimensional hyperplane equation | |
955 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 | |
956 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) | |
957 | // zc: center of the pad row | |
958 | // zt: z-position of the track | |
959 | // The z-position of the track is assumed to be linear dependent on the x-position | |
960 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 | |
961 | // Transformation: u = 2 * x * t | |
962 | // v = 2 * tan(phiT) * t | |
963 | // w = 2 * tan(phiT) * (x - xref) * t | |
964 | // t = 1 / (x^2 + ymeas^2) | |
965 | // Parameters: a = -1/y0 | |
966 | // b = x0/y0 | |
967 | // c = (R^2 -x0^2 - y0^2)/y0 | |
968 | // d = offset | |
969 | // e = dz/dx | |
970 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using | |
971 | // results from the simple riemann fit. Afterwards the fit is redone. | |
972 | // The curvature is calculated according to the formula: | |
973 | // curv = a/(1 + b^2 + c*a) = 1/R | |
974 | // | |
975 | // Paramters: - Array of tracklets (connected to the track candidate) | |
976 | // - Flag selecting the error definition | |
977 | // Output: - Chi2 value of the track | |
978 | // | |
979 | // debug level 5 | |
980 | // | |
eb38ed55 | 981 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
982 | fitter->StoreData(kTRUE); | |
983 | fitter->ClearPoints(); | |
984 | ||
985 | // Calculate the reference position: | |
986 | Int_t nDistances = 0; | |
987 | Float_t meanDistance = 0.; | |
988 | Int_t startIndex = 5; | |
989 | for(Int_t il =5; il > 0; il--){ | |
990 | if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){ | |
991 | meanDistance += tracklets[il].GetX0() - tracklets[il -1].GetX0(); | |
992 | nDistances++; | |
993 | } | |
994 | if(tracklets[il].IsOK()) startIndex = il; | |
995 | } | |
996 | meanDistance /= nDistances; | |
997 | if(tracklets[0].IsOK()) startIndex = 0; | |
998 | Double_t xref = tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
999 | ||
1000 | Float_t x, y, z, t, tilt, xdelta, rhs, error; | |
1001 | Float_t dzMean = 0; Int_t dzcounter = 0; // A reference z and a reference slope is used if the fitresults in z-direction are not acceptable | |
1002 | Double_t uvt[4]; | |
1003 | Int_t nPoints = 0; | |
1004 | for(Int_t ipl = 0; ipl < AliTRDgeometry::kNplan; ipl++){ | |
1005 | if(!tracklets[ipl].IsOK()) continue; | |
1006 | dzMean += tracklets[ipl].GetZfitR(1); | |
1007 | dzcounter++; | |
2985ffcb | 1008 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
eb38ed55 | 1009 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1010 | x = tracklets[ipl].GetX(itb) + tracklets[ipl].GetX0(); | |
1011 | y = tracklets[ipl].GetY(itb); | |
1012 | z = tracklets[ipl].GetZ(itb); | |
1013 | tilt = tracklets[ipl].GetTilt(); | |
1014 | xdelta = x - xref; | |
1015 | // Transformation | |
1016 | t = 1/(x*x + y*y); | |
1017 | uvt[0] = 2.0 * x * t; | |
1018 | uvt[1] = t; | |
1019 | uvt[2] = 2.0 * tilt * t; | |
1020 | uvt[3] = 2.0 * tilt * xdelta * t; | |
1021 | rhs = 2.0 * (y + tilt*z) * t; | |
1022 | // error definition changes for the different calls | |
1023 | error = 2.0 * t; | |
1024 | error *= sigError ? tracklets[ipl].GetSigmaY() : 0.2; | |
1025 | fitter->AddPoint(uvt, rhs, error); | |
1026 | nPoints++; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | fitter->Eval(); | |
1031 | ||
1032 | Double_t offset = fitter->GetParameter(3); | |
1033 | Double_t slope = fitter->GetParameter(4); | |
1034 | ||
1035 | // Linear fitter - not possible to make boundaries | |
1036 | // Do not accept non possible z and dzdx combinations | |
1037 | Bool_t acceptablez = kTRUE; | |
1038 | Double_t zref = 0.0; | |
1039 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNplan; iLayer++) { | |
1040 | if(!tracklets[iLayer].IsOK()) continue; | |
1041 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
1042 | if (TMath::Abs(tracklets[iLayer].GetZProb() - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) | |
1043 | acceptablez = kFALSE; | |
1044 | } | |
1045 | if (!acceptablez) { | |
1046 | dzMean /= dzcounter; | |
1047 | Double_t zmf = tracklets[startIndex].GetZfitR(0) + dzMean * (xref - tracklets[startIndex].GetX0()); // Z-Position of the track at the middle of a stack assuming a linear dependence on x (approximation) | |
1048 | fgTiltedRieman->FixParameter(3, zmf); | |
1049 | fgTiltedRieman->FixParameter(4, dzMean); | |
1050 | fitter->Eval(); | |
1051 | fitter->ReleaseParameter(3); | |
1052 | fitter->ReleaseParameter(4); | |
1053 | offset = fitter->GetParameter(3); | |
1054 | slope = fitter->GetParameter(4); | |
1055 | } | |
1056 | ||
1057 | // Calculate Curvarture | |
1058 | Double_t a = fitter->GetParameter(0); | |
1059 | Double_t b = fitter->GetParameter(1); | |
1060 | Double_t c = fitter->GetParameter(2); | |
1061 | Double_t curvature = 1.0 + b*b - c*a; | |
1062 | Double_t dca = 0.0; // Distance to closest approach | |
1063 | if (curvature > 0.0) { | |
1064 | dca = -c / (TMath::Sqrt(1.0 + b*b - c*a) + TMath::Sqrt(1.0 + b*b)); | |
1065 | curvature = a / TMath::Sqrt(curvature); | |
1066 | } | |
1067 | ||
1068 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1069 | ||
1070 | // Update the tracklets | |
1071 | Double_t dy, dz; | |
1072 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { | |
1073 | ||
1074 | x = tracklets[iLayer].GetX0(); | |
1075 | y = 0; | |
1076 | z = 0; | |
1077 | dy = 0; | |
1078 | dz = 0; | |
1079 | ||
1080 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
1081 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1082 | // R = Sqrt() = 1/Curvature | |
1083 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
1084 | Double_t res = (x * a + b); // = (x - x0)/y0 | |
1085 | res *= res; | |
1086 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 | |
1087 | if (res >= 0) { | |
1088 | res = TMath::Sqrt(res); | |
1089 | y = (1.0 - res) / a; | |
1090 | } | |
1091 | ||
1092 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
1093 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
1094 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1095 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
1096 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
1097 | Double_t x0 = -b / a; | |
1098 | if (-c * a + b * b + 1 > 0) { | |
1099 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
1100 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); | |
1101 | if (a < 0) yderiv *= -1.0; | |
1102 | dy = yderiv; | |
1103 | } | |
1104 | } | |
1105 | z = offset + slope * (x - xref); | |
1106 | dz = slope; | |
1107 | tracklets[iLayer].SetYref(0, y); | |
1108 | tracklets[iLayer].SetYref(1, dy); | |
1109 | tracklets[iLayer].SetZref(0, z); | |
1110 | tracklets[iLayer].SetZref(1, dz); | |
1111 | tracklets[iLayer].SetC(curvature); | |
1112 | tracklets[iLayer].SetChi2(chi2track); | |
1113 | } | |
1114 | ||
1115 | ||
1116 | if(AliTRDReconstructor::StreamLevel() >= 5){ | |
1117 | Double_t chi2Z = CalculateChi2Z(tracklets, offset, slope); | |
1118 | TTreeSRedirector &treeStreamer = *fgDebugStreamer; | |
1119 | treeStreamer << "FitTiltedRieman" | |
1120 | << "error=" << sigError | |
1121 | << "Curvature=" << curvature | |
1122 | << "Chi2track=" << chi2track | |
1123 | << "Chi2Z=" << chi2Z | |
1124 | << "D=" << c | |
1125 | << "DCA=" << dca | |
1126 | << "Offset=" << offset | |
1127 | << "Slope=" << slope | |
1128 | << "\n"; | |
1129 | } | |
1130 | ||
1131 | return chi2track; | |
1132 | } | |
1133 | ||
1134 | //_________________________________________________________________________ | |
1135 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope) | |
1136 | { | |
1137 | // | |
1138 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. | |
1139 | // A linear dependence on the x-value serves as a model. | |
1140 | // The parameters are related to the tilted Riemann fit. | |
1141 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
1142 | // - the offset for the reference x | |
1143 | // - the slope | |
1144 | // Output: - The Chi2 value of the track in z-Direction | |
1145 | // | |
1146 | Double_t xref = .5 * (tracklets[2].GetX0() + tracklets[3].GetX0()); | |
1147 | Float_t chi2Z = 0, nLayers = 0; | |
1148 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNplan; iLayer++) { | |
1149 | if(!tracklets[iLayer].IsOK()) continue; | |
1150 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
1151 | chi2Z += TMath::Abs(tracklets[iLayer].GetMeanz() - z); | |
1152 | nLayers++; | |
1153 | } | |
1154 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); | |
1155 | return chi2Z; | |
1156 | } | |
1157 | ||
1158 | ||
1159 | ||
bccda319 | 1160 | //_____________________________________________________________________________ |
1161 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) | |
1162 | { | |
1163 | // | |
1164 | // Starting from current X-position of track <t> this function | |
1165 | // extrapolates the track up to radial position <xToGo>. | |
1166 | // Returns 1 if track reaches the plane, and 0 otherwise | |
1167 | // | |
1168 | ||
1169 | const Double_t kEpsilon = 0.00001; | |
1170 | ||
1171 | // Current track X-position | |
1172 | Double_t xpos = t.GetX(); | |
1173 | ||
1174 | // Direction: inward or outward | |
1175 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; | |
1176 | ||
1177 | while (((xToGo - xpos) * dir) > kEpsilon) { | |
1178 | ||
1179 | Double_t xyz0[3]; | |
1180 | Double_t xyz1[3]; | |
1181 | Double_t param[7]; | |
1182 | Double_t x; | |
1183 | Double_t y; | |
1184 | Double_t z; | |
1185 | ||
1186 | // The next step size | |
1187 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); | |
1188 | ||
1189 | // Get the global position of the starting point | |
1190 | t.GetXYZ(xyz0); | |
1191 | ||
1192 | // X-position after next step | |
1193 | x = xpos + step; | |
1194 | ||
1195 | // Get local Y and Z at the X-position of the next step | |
1196 | if (!t.GetProlongation(x,y,z)) { | |
1197 | return 0; // No prolongation possible | |
1198 | } | |
1199 | ||
1200 | // The global position of the end point of this prolongation step | |
1201 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); | |
1202 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); | |
1203 | xyz1[2] = z; | |
1204 | ||
1205 | // Calculate the mean material budget between start and | |
1206 | // end point of this prolongation step | |
eb38ed55 | 1207 | AliTracker::MeanMaterialBudget(xyz0, xyz1, param); |
bccda319 | 1208 | |
1209 | // Propagate the track to the X-position after the next step | |
1210 | if (!t.PropagateTo(x,param[1],param[0]*param[4])) { | |
1211 | return 0; | |
1212 | } | |
1213 | ||
1214 | // Rotate the track if necessary | |
1215 | AdjustSector(&t); | |
1216 | ||
1217 | // New track X-position | |
1218 | xpos = t.GetX(); | |
1219 | ||
1220 | } | |
1221 | ||
1222 | return 1; | |
1223 | ||
1224 | } | |
1225 | ||
eb38ed55 | 1226 | |
1227 | //_____________________________________________________________________________ | |
1228 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const | |
1229 | { | |
1230 | // | |
1231 | // Reads AliTRDclusters from the file. | |
1232 | // The names of the cluster tree and branches | |
1233 | // should match the ones used in AliTRDclusterizer::WriteClusters() | |
1234 | // | |
1235 | ||
1236 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); | |
1237 | TObjArray *clusterArray = new TObjArray(nsize+1000); | |
1238 | ||
1239 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); | |
1240 | if (!branch) { | |
1241 | AliError("Can't get the branch !"); | |
1242 | return 1; | |
1243 | } | |
1244 | branch->SetAddress(&clusterArray); | |
1245 | ||
1246 | if(!fClusters){ | |
1247 | array = new TClonesArray("AliTRDcluster", nsize); | |
1248 | array->SetOwner(kTRUE); | |
1249 | } | |
1250 | ||
1251 | // Loop through all entries in the tree | |
1252 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); | |
1253 | Int_t nbytes = 0; | |
1254 | Int_t ncl = 0; | |
1255 | AliTRDcluster *c = 0x0; | |
1256 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { | |
1257 | // Import the tree | |
1258 | nbytes += clusterTree->GetEvent(iEntry); | |
1259 | ||
1260 | // Get the number of points in the detector | |
1261 | Int_t nCluster = clusterArray->GetEntriesFast(); | |
1262 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { | |
1263 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; | |
1264 | new((*fClusters)[ncl++]) AliTRDcluster(*c); | |
1265 | clusterArray->RemoveAt(iCluster); | |
1266 | } | |
1267 | ||
1268 | } | |
1269 | delete clusterArray; | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | //_____________________________________________________________________________ | |
1275 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) | |
1276 | { | |
1277 | // | |
1278 | // Fills clusters into TRD tracking_sectors | |
1279 | // Note that the numbering scheme for the TRD tracking_sectors | |
1280 | // differs from that of TRD sectors | |
1281 | // | |
1282 | ||
1283 | ||
1284 | if (ReadClusters(fClusters, cTree)) { | |
1285 | AliError("Problem with reading the clusters !"); | |
1286 | return 1; | |
1287 | } | |
1288 | Int_t ncl = fClusters->GetEntriesFast(), nin = 0; | |
75b9b3c1 | 1289 | if(!ncl){ |
1290 | AliInfo("Clusters 0"); | |
1291 | return 1; | |
1292 | } | |
1293 | ||
eb38ed55 | 1294 | Int_t icl = ncl; |
1295 | while (icl--) { | |
1296 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); | |
1297 | if(c->IsInChamber()) nin++; | |
1298 | Int_t detector = c->GetDetector(); | |
1299 | Int_t sector = fGeom->GetSector(detector); | |
1300 | Int_t stack = fGeom->GetChamber(detector); | |
1301 | Int_t plane = fGeom->GetPlane(detector); | |
1302 | ||
1303 | fTrSec[sector].GetChamber(stack, plane, kTRUE)->InsertCluster(c, icl); | |
1304 | } | |
1305 | AliInfo(Form("Clusters %d in %6.2f %%", ncl, 100.*float(nin)/ncl)); | |
1306 | ||
1307 | for(int isector =0; isector<AliTRDgeometry::kNsect; isector++){ | |
1308 | if(!fTrSec[isector].GetNChambers()) continue; | |
1309 | fTrSec[isector].Init(); | |
1310 | } | |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
1315 | ||
0906e73e | 1316 | //____________________________________________________________________ |
1317 | void AliTRDtrackerV1::UnloadClusters() | |
1318 | { | |
1319 | // | |
1320 | // Clears the arrays of clusters and tracks. Resets sectors and timebins | |
1321 | // | |
1322 | ||
eb38ed55 | 1323 | if(fTracks) fTracks->Delete(); |
1324 | if(fTracklets) fTracklets->Delete(); | |
1325 | if(fClusters) fClusters->Delete(); | |
0906e73e | 1326 | |
eb38ed55 | 1327 | for (int i = 0; i < AliTRDgeometry::kNsect; i++) fTrSec[i].Clear(); |
0906e73e | 1328 | |
eb38ed55 | 1329 | } |
0906e73e | 1330 | |
eb38ed55 | 1331 | //_____________________________________________________________________________ |
1332 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track) | |
1333 | { | |
1334 | // | |
1335 | // Rotates the track when necessary | |
1336 | // | |
1337 | ||
1338 | Double_t alpha = AliTRDgeometry::GetAlpha(); | |
1339 | Double_t y = track->GetY(); | |
1340 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); | |
0906e73e | 1341 | |
eb38ed55 | 1342 | if (y > ymax) { |
1343 | if (!track->Rotate( alpha)) { | |
1344 | return kFALSE; | |
0906e73e | 1345 | } |
eb38ed55 | 1346 | } |
1347 | else if (y < -ymax) { | |
1348 | if (!track->Rotate(-alpha)) { | |
1349 | return kFALSE; | |
1350 | } | |
1351 | } | |
1352 | ||
1353 | return kTRUE; | |
0906e73e | 1354 | |
1355 | } | |
1356 | ||
eb38ed55 | 1357 | |
0906e73e | 1358 | //____________________________________________________________________ |
1359 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx) | |
1360 | { | |
1361 | // Find tracklet for TRD track <track> | |
1362 | // Parameters | |
1363 | // - track | |
1364 | // - sector | |
1365 | // - plane | |
1366 | // - index | |
1367 | // Output | |
1368 | // tracklet | |
1369 | // index | |
1370 | // Detailed description | |
1371 | // | |
1372 | idx = track->GetTrackletIndex(p); | |
0906e73e | 1373 | AliTRDseedV1 *tracklet = idx<0 ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
0906e73e | 1374 | |
1375 | return tracklet; | |
1376 | } | |
1377 | ||
1378 | //____________________________________________________________________ | |
bc11c056 | 1379 | Int_t AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet) |
0906e73e | 1380 | { |
1381 | // Add this tracklet to the list of tracklets stored in the tracker | |
1382 | // | |
1383 | // Parameters | |
1384 | // - tracklet : pointer to the tracklet to be added to the list | |
1385 | // | |
1386 | // Output | |
1387 | // - the index of the new tracklet in the tracker tracklets list | |
1388 | // | |
1389 | // Detailed description | |
1390 | // Build the tracklets list if it is not yet created (late initialization) | |
1391 | // and adds the new tracklet to the list. | |
1392 | // | |
1393 | if(!fTracklets){ | |
1394 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsect()*kMaxTracksStack); | |
1395 | fTracklets->SetOwner(kTRUE); | |
1396 | } | |
1397 | Int_t nentries = fTracklets->GetEntriesFast(); | |
58bc08c1 | 1398 | new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); |
0906e73e | 1399 | return nentries; |
1400 | } | |
1401 | ||
e4f2f73d | 1402 | //____________________________________________________________________ |
eb38ed55 | 1403 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d | 1404 | { |
1405 | // | |
1406 | // Steer tracking for one SM. | |
1407 | // | |
1408 | // Parameters : | |
1409 | // sector : Array of (SM) propagation layers containing clusters | |
1410 | // esd : The current ESD event. On output it contains the also | |
1411 | // the ESD (TRD) tracks found in this SM. | |
1412 | // | |
1413 | // Output : | |
1414 | // Number of tracks found in this TRD supermodule. | |
1415 | // | |
1416 | // Detailed description | |
1417 | // | |
1418 | // 1. Unpack AliTRDpropagationLayers objects for each stack. | |
1419 | // 2. Launch stack tracking. | |
1420 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. | |
1421 | // 3. Pack results in the ESD event. | |
1422 | // | |
1423 | ||
e4f2f73d | 1424 | // allocate space for esd tracks in this SM |
1425 | TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack); | |
1426 | esdTrackList.SetOwner(); | |
e4f2f73d | 1427 | |
eb38ed55 | 1428 | Int_t nTracks = 0; |
1429 | Int_t nChambers = 0; | |
1430 | AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0; | |
1431 | for(int istack = 0; istack<AliTRDgeometry::kNcham; istack++){ | |
1432 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; | |
1433 | nChambers = 0; | |
1434 | for(int iplane=0; iplane<AliTRDgeometry::kNplan; iplane++){ | |
1435 | if(!(chamber = stack[iplane])) continue; | |
2985ffcb | 1436 | if(chamber->GetNClusters() < fgNTimeBins * AliTRDReconstructor::RecoParam()->GetFindableClusters()) continue; |
eb38ed55 | 1437 | nChambers++; |
1438 | //AliInfo(Form("sector %d stack %d plane %d clusters %d", sector, istack, iplane, chamber->GetNClusters())); | |
e4f2f73d | 1439 | } |
eb38ed55 | 1440 | if(nChambers < 4) continue; |
1441 | //AliInfo(Form("Doing stack %d", istack)); | |
1442 | nTracks += Clusters2TracksStack(stack, &esdTrackList); | |
e4f2f73d | 1443 | } |
eb38ed55 | 1444 | //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks())); |
e4f2f73d | 1445 | |
eb38ed55 | 1446 | for(int itrack=0; itrack<nTracks; itrack++) |
e4f2f73d | 1447 | esd->AddTrack((AliESDtrack*)esdTrackList[itrack]); |
1448 | ||
eb38ed55 | 1449 | return nTracks; |
e4f2f73d | 1450 | } |
1451 | ||
1452 | //____________________________________________________________________ | |
eb38ed55 | 1453 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList) |
e4f2f73d | 1454 | { |
1455 | // | |
1456 | // Make tracks in one TRD stack. | |
1457 | // | |
1458 | // Parameters : | |
1459 | // layer : Array of stack propagation layers containing clusters | |
1460 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. | |
1461 | // On exit the tracks found in this stack are appended. | |
1462 | // | |
1463 | // Output : | |
1464 | // Number of tracks found in this stack. | |
1465 | // | |
1466 | // Detailed description | |
1467 | // | |
1468 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. | |
1469 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. | |
1470 | // See AliTRDtrackerV1::MakeSeeds() for more details. | |
1471 | // 3. Arrange track candidates in decreasing order of their quality | |
1472 | // 4. Classify tracks in 5 categories according to: | |
1473 | // a) number of layers crossed | |
1474 | // b) track quality | |
1475 | // 5. Sign clusters by tracks in decreasing order of track quality | |
1476 | // 6. Build AliTRDtrack out of seeding tracklets | |
1477 | // 7. Cook MC label | |
1478 | // 8. Build ESD track and register it to the output list | |
1479 | // | |
1480 | ||
eb38ed55 | 1481 | AliTRDtrackingChamber *chamber = 0x0; |
e4f2f73d | 1482 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
0906e73e | 1483 | Int_t pars[4]; // MakeSeeds parameters |
e4f2f73d | 1484 | |
1485 | //Double_t alpha = AliTRDgeometry::GetAlpha(); | |
1486 | //Double_t shift = .5 * alpha; | |
1487 | Int_t configs[kNConfigs]; | |
1488 | ||
1489 | // Build initial seeding configurations | |
eb38ed55 | 1490 | Double_t quality = BuildSeedingConfigs(stack, configs); |
1491 | if(AliTRDReconstructor::StreamLevel() > 1){ | |
1492 | AliInfo(Form("Plane config %d %d %d Quality %f" | |
1493 | , configs[0], configs[1], configs[2], quality)); | |
1494 | } | |
1495 | ||
e4f2f73d | 1496 | // Initialize contors |
1497 | Int_t ntracks, // number of TRD track candidates | |
1498 | ntracks1, // number of registered TRD tracks/iter | |
1499 | ntracks2 = 0; // number of all registered TRD tracks in stack | |
1500 | fSieveSeeding = 0; | |
1501 | do{ | |
1502 | // Loop over seeding configurations | |
1503 | ntracks = 0; ntracks1 = 0; | |
1504 | for (Int_t iconf = 0; iconf<3; iconf++) { | |
1505 | pars[0] = configs[iconf]; | |
eb38ed55 | 1506 | pars[1] = ntracks; |
1507 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); | |
e4f2f73d | 1508 | if(ntracks == kMaxTracksStack) break; |
1509 | } | |
eb38ed55 | 1510 | if(AliTRDReconstructor::StreamLevel() > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
1511 | ||
e4f2f73d | 1512 | if(!ntracks) break; |
1513 | ||
1514 | // Sort the seeds according to their quality | |
1515 | Int_t sort[kMaxTracksStack]; | |
1516 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); | |
1517 | ||
1518 | // Initialize number of tracks so far and logic switches | |
1519 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); | |
1520 | Bool_t signedTrack[kMaxTracksStack]; | |
1521 | Bool_t fakeTrack[kMaxTracksStack]; | |
1522 | for (Int_t i=0; i<ntracks; i++){ | |
1523 | signedTrack[i] = kFALSE; | |
1524 | fakeTrack[i] = kFALSE; | |
1525 | } | |
1526 | //AliInfo("Selecting track candidates ..."); | |
1527 | ||
1528 | // Sieve clusters in decreasing order of track quality | |
1529 | Double_t trackParams[7]; | |
1530 | // AliTRDseedV1 *lseed = 0x0; | |
1531 | Int_t jSieve = 0, candidates; | |
1532 | do{ | |
1533 | //AliInfo(Form("\t\tITER = %i ", jSieve)); | |
1534 | ||
1535 | // Check track candidates | |
1536 | candidates = 0; | |
1537 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { | |
1538 | Int_t trackIndex = sort[itrack]; | |
1539 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; | |
1540 | ||
1541 | ||
1542 | // Calculate track parameters from tracklets seeds | |
1543 | Int_t labelsall[1000]; | |
1544 | Int_t nlabelsall = 0; | |
1545 | Int_t naccepted = 0; | |
1546 | Int_t ncl = 0; | |
1547 | Int_t nused = 0; | |
1548 | Int_t nlayers = 0; | |
1549 | Int_t findable = 0; | |
1550 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { | |
1551 | Int_t jseed = kNPlanes*trackIndex+jLayer; | |
e4f2f73d | 1552 | if(!sseed[jseed].IsOK()) continue; |
eb38ed55 | 1553 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.15) findable++; |
1554 | ||
e4f2f73d | 1555 | sseed[jseed].UpdateUsed(); |
1556 | ncl += sseed[jseed].GetN2(); | |
1557 | nused += sseed[jseed].GetNUsed(); | |
1558 | nlayers++; | |
1559 | ||
1560 | // Cooking label | |
2985ffcb | 1561 | for (Int_t itime = 0; itime < fgNTimeBins; itime++) { |
e4f2f73d | 1562 | if(!sseed[jseed].IsUsable(itime)) continue; |
1563 | naccepted++; | |
1564 | Int_t tindex = 0, ilab = 0; | |
1565 | while(ilab<3 && (tindex = sseed[jseed].GetClusters(itime)->GetLabel(ilab)) >= 0){ | |
1566 | labelsall[nlabelsall++] = tindex; | |
1567 | ilab++; | |
1568 | } | |
1569 | } | |
1570 | } | |
1571 | // Filter duplicated tracks | |
1572 | if (nused > 30){ | |
eb38ed55 | 1573 | //printf("Skip %d nused %d\n", trackIndex, nused); |
e4f2f73d | 1574 | fakeTrack[trackIndex] = kTRUE; |
1575 | continue; | |
1576 | } | |
1577 | if (Float_t(nused)/ncl >= .25){ | |
eb38ed55 | 1578 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); |
e4f2f73d | 1579 | fakeTrack[trackIndex] = kTRUE; |
1580 | continue; | |
1581 | } | |
1582 | ||
1583 | // Classify tracks | |
1584 | Bool_t skip = kFALSE; | |
1585 | switch(jSieve){ | |
1586 | case 0: | |
1587 | if(nlayers < 6) {skip = kTRUE; break;} | |
1588 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
1589 | break; | |
1590 | ||
1591 | case 1: | |
1592 | if(nlayers < findable){skip = kTRUE; break;} | |
1593 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} | |
1594 | break; | |
1595 | ||
1596 | case 2: | |
1597 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} | |
1598 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} | |
1599 | break; | |
1600 | ||
1601 | case 3: | |
1602 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
1603 | break; | |
1604 | ||
1605 | case 4: | |
1606 | if (nlayers == 3){skip = kTRUE; break;} | |
0906e73e | 1607 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} |
e4f2f73d | 1608 | break; |
1609 | } | |
1610 | if(skip){ | |
1611 | candidates++; | |
eb38ed55 | 1612 | //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused); |
e4f2f73d | 1613 | continue; |
1614 | } | |
1615 | signedTrack[trackIndex] = kTRUE; | |
1616 | ||
1617 | ||
1618 | // Build track label - what happens if measured data ??? | |
1619 | Int_t labels[1000]; | |
1620 | Int_t outlab[1000]; | |
1621 | Int_t nlab = 0; | |
1622 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
1623 | Int_t jseed = kNPlanes*trackIndex+iLayer; | |
1624 | if(!sseed[jseed].IsOK()) continue; | |
1625 | for(int ilab=0; ilab<2; ilab++){ | |
1626 | if(sseed[jseed].GetLabels(ilab) < 0) continue; | |
1627 | labels[nlab] = sseed[jseed].GetLabels(ilab); | |
1628 | nlab++; | |
1629 | } | |
1630 | } | |
1631 | Freq(nlab,labels,outlab,kFALSE); | |
1632 | Int_t label = outlab[0]; | |
1633 | Int_t frequency = outlab[1]; | |
1634 | Freq(nlabelsall,labelsall,outlab,kFALSE); | |
1635 | Int_t label1 = outlab[0]; | |
1636 | Int_t label2 = outlab[2]; | |
1637 | Float_t fakeratio = (naccepted - outlab[1]) / Float_t(naccepted); | |
1638 | ||
1639 | ||
1640 | // Sign clusters | |
1641 | AliTRDcluster *cl = 0x0; Int_t clusterIndex = -1; | |
1642 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { | |
1643 | Int_t jseed = kNPlanes*trackIndex+jLayer; | |
1644 | if(!sseed[jseed].IsOK()) continue; | |
1645 | if(TMath::Abs(sseed[jseed].GetYfit(1) - sseed[jseed].GetYfit(1)) >= .2) continue; // check this condition with Marian | |
1646 | sseed[jseed].UseClusters(); | |
1647 | if(!cl){ | |
1648 | Int_t ic = 0; | |
1649 | while(!(cl = sseed[jseed].GetClusters(ic))) ic++; | |
1650 | clusterIndex = sseed[jseed].GetIndexes(ic); | |
1651 | } | |
1652 | } | |
1653 | if(!cl) continue; | |
1654 | ||
1655 | ||
1656 | // Build track parameters | |
1657 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; | |
1658 | Int_t idx = 0; | |
1659 | while(idx<3 && !lseed->IsOK()) { | |
1660 | idx++; | |
1661 | lseed++; | |
1662 | } | |
1663 | Double_t cR = lseed->GetC(); | |
1664 | trackParams[1] = lseed->GetYref(0); | |
1665 | trackParams[2] = lseed->GetZref(0); | |
1666 | trackParams[3] = lseed->GetX0() * cR - TMath::Sin(TMath::ATan(lseed->GetYref(1))); | |
1667 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); | |
1668 | trackParams[5] = cR; | |
1669 | trackParams[0] = lseed->GetX0(); | |
eb38ed55 | 1670 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; |
1671 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ | |
e4f2f73d | 1672 | |
eb38ed55 | 1673 | if(AliTRDReconstructor::StreamLevel() > 1){ |
1674 | AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); | |
1675 | ||
e4f2f73d | 1676 | Int_t nclusters = 0; |
1677 | AliTRDseedV1 *dseed[6]; | |
1678 | for(int is=0; is<6; is++){ | |
0906e73e | 1679 | dseed[is] = new AliTRDseedV1(sseed[trackIndex*6+is]); |
1680 | dseed[is]->SetOwner(); | |
e4f2f73d | 1681 | nclusters += sseed[is].GetN2(); |
e4f2f73d | 1682 | } |
1683 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); | |
1684 | //AliInfo(Form("Number of clusters %d.", nclusters)); | |
eb38ed55 | 1685 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
e4f2f73d | 1686 | cstreamer << "Clusters2TracksStack" |
1687 | << "Iter=" << fSieveSeeding | |
1688 | << "Like=" << fTrackQuality[trackIndex] | |
1689 | << "S0.=" << dseed[0] | |
1690 | << "S1.=" << dseed[1] | |
1691 | << "S2.=" << dseed[2] | |
1692 | << "S3.=" << dseed[3] | |
1693 | << "S4.=" << dseed[4] | |
1694 | << "S5.=" << dseed[5] | |
1695 | << "p0=" << trackParams[0] | |
1696 | << "p1=" << trackParams[1] | |
1697 | << "p2=" << trackParams[2] | |
1698 | << "p3=" << trackParams[3] | |
1699 | << "p4=" << trackParams[4] | |
1700 | << "p5=" << trackParams[5] | |
1701 | << "p6=" << trackParams[6] | |
e4f2f73d | 1702 | << "Label=" << label |
1703 | << "Label1=" << label1 | |
1704 | << "Label2=" << label2 | |
1705 | << "FakeRatio=" << fakeratio | |
1706 | << "Freq=" << frequency | |
1707 | << "Ncl=" << ncl | |
1708 | << "NLayers=" << nlayers | |
1709 | << "Findable=" << findable | |
1710 | << "NUsed=" << nused | |
1711 | << "\n"; | |
e4f2f73d | 1712 | } |
e4f2f73d | 1713 | |
eb38ed55 | 1714 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
e4f2f73d | 1715 | if(!track){ |
eb38ed55 | 1716 | //AliWarning("Fail to build a TRD Track."); |
e4f2f73d | 1717 | continue; |
1718 | } | |
eb38ed55 | 1719 | //AliInfo("End of MakeTrack()"); |
e4f2f73d | 1720 | AliESDtrack esdTrack; |
1721 | esdTrack.UpdateTrackParams(track, AliESDtrack::kTRDout); | |
1722 | esdTrack.SetLabel(track->GetLabel()); | |
1723 | new ((*esdTrackList)[ntracks0++]) AliESDtrack(esdTrack); | |
1724 | ntracks1++; | |
1725 | } | |
1726 | ||
1727 | jSieve++; | |
1728 | } while(jSieve<5 && candidates); // end track candidates sieve | |
1729 | if(!ntracks1) break; | |
1730 | ||
1731 | // increment counters | |
1732 | ntracks2 += ntracks1; | |
1733 | fSieveSeeding++; | |
1734 | ||
1735 | // Rebuild plane configurations and indices taking only unused clusters into account | |
eb38ed55 | 1736 | quality = BuildSeedingConfigs(stack, configs); |
1737 | if(quality < 1.E-7) break; //AliTRDReconstructor::RecoParam()->GetPlaneQualityThreshold()) break; | |
e4f2f73d | 1738 | |
eb38ed55 | 1739 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
1740 | if(!(chamber = stack[ip])) continue; | |
1741 | chamber->Build(fGeom);//Indices(fSieveSeeding); | |
1742 | } | |
e4f2f73d | 1743 | |
eb38ed55 | 1744 | if(AliTRDReconstructor::StreamLevel() > 1){ |
1745 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); | |
1746 | } | |
e4f2f73d | 1747 | } while(fSieveSeeding<10); // end stack clusters sieve |
1748 | ||
1749 | ||
1750 | ||
1751 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); | |
1752 | ||
1753 | return ntracks2; | |
1754 | } | |
1755 | ||
1756 | //___________________________________________________________________ | |
eb38ed55 | 1757 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d | 1758 | { |
1759 | // | |
1760 | // Assign probabilities to chambers according to their | |
1761 | // capability of producing seeds. | |
1762 | // | |
1763 | // Parameters : | |
1764 | // | |
1765 | // layers : Array of stack propagation layers for all 6 chambers in one stack | |
1766 | // configs : On exit array of configuration indexes (see GetSeedingConfig() | |
1767 | // for details) in the decreasing order of their seeding probabilities. | |
1768 | // | |
1769 | // Output : | |
1770 | // | |
1771 | // Return top configuration quality | |
1772 | // | |
1773 | // Detailed description: | |
1774 | // | |
1775 | // To each chamber seeding configuration (see GetSeedingConfig() for | |
1776 | // the list of all configurations) one defines 2 quality factors: | |
1777 | // - an apriori topological quality (see GetSeedingConfig() for details) and | |
1778 | // - a data quality based on the uniformity of the distribution of | |
1779 | // clusters over the x range (time bins population). See CookChamberQA() for details. | |
1780 | // The overall chamber quality is given by the product of this 2 contributions. | |
1781 | // | |
1782 | ||
eb38ed55 | 1783 | Double_t chamberQ[kNPlanes]; |
1784 | AliTRDtrackingChamber *chamber = 0x0; | |
e4f2f73d | 1785 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
eb38ed55 | 1786 | if(!(chamber = stack[iplane])) continue; |
2985ffcb | 1787 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; |
e4f2f73d | 1788 | } |
1789 | ||
1790 | Double_t tconfig[kNConfigs]; | |
1791 | Int_t planes[4]; | |
1792 | for(int iconf=0; iconf<kNConfigs; iconf++){ | |
1793 | GetSeedingConfig(iconf, planes); | |
d76231c8 | 1794 | tconfig[iconf] = fgTopologicQA[iconf]; |
eb38ed55 | 1795 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; |
e4f2f73d | 1796 | } |
1797 | ||
1798 | TMath::Sort(kNConfigs, tconfig, configs, kTRUE); | |
eb38ed55 | 1799 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); |
1800 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); | |
1801 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); | |
1802 | ||
e4f2f73d | 1803 | return tconfig[configs[0]]; |
1804 | } | |
1805 | ||
1806 | //____________________________________________________________________ | |
eb38ed55 | 1807 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar) |
e4f2f73d | 1808 | { |
1809 | // | |
1810 | // Make tracklet seeds in the TRD stack. | |
1811 | // | |
1812 | // Parameters : | |
1813 | // layers : Array of stack propagation layers containing clusters | |
1814 | // sseed : Array of empty tracklet seeds. On exit they are filled. | |
1815 | // ipar : Control parameters: | |
1816 | // ipar[0] -> seeding chambers configuration | |
1817 | // ipar[1] -> stack index | |
1818 | // ipar[2] -> number of track candidates found so far | |
1819 | // | |
1820 | // Output : | |
1821 | // Number of tracks candidates found. | |
1822 | // | |
1823 | // Detailed description | |
1824 | // | |
1825 | // The following steps are performed: | |
1826 | // 1. Select seeding layers from seeding chambers | |
1827 | // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack. | |
1828 | // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in | |
1829 | // this order. The parameters controling the range of accepted clusters in | |
eb38ed55 | 1830 | // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond(). |
e4f2f73d | 1831 | // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)) |
1832 | // 4. Initialize seeding tracklets in the seeding chambers. | |
1833 | // 5. Filter 0. | |
1834 | // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer)) | |
1835 | // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer)) | |
1836 | // 6. Attach clusters to seeding tracklets and find linear approximation of | |
1837 | // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used | |
1838 | // clusters used by current seeds should not exceed ... (25). | |
1839 | // 7. Filter 1. | |
1840 | // All 4 seeding tracklets should be correctly constructed (see | |
1841 | // AliTRDseedV1::AttachClustersIter()) | |
1842 | // 8. Helix fit of the seeding tracklets | |
1843 | // 9. Filter 2. | |
1844 | // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details) | |
1845 | // 10. Extrapolation of the helix fit to the other 2 chambers: | |
1846 | // a) Initialization of extrapolation tracklet with fit parameters | |
1847 | // b) Helix fit of tracklets | |
1848 | // c) Attach clusters and linear interpolation to extrapolated tracklets | |
1849 | // d) Helix fit of tracklets | |
1850 | // 11. Improve seeding tracklets quality by reassigning clusters. | |
1851 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. | |
1852 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation | |
1853 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. | |
1854 | // 14. Cooking labels for tracklets. Should be done only for MC | |
1855 | // 15. Register seeds. | |
1856 | // | |
1857 | ||
eb38ed55 | 1858 | AliTRDtrackingChamber *chamber = 0x0; |
e4f2f73d | 1859 | AliTRDcluster *c[4] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters |
1860 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track | |
1861 | Int_t ncl, mcl; // working variable for looping over clusters | |
eb38ed55 | 1862 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; |
e4f2f73d | 1863 | // chi2 storage |
1864 | // chi2[0] = tracklet chi2 on the Z direction | |
1865 | // chi2[1] = tracklet chi2 on the R direction | |
1866 | Double_t chi2[4]; | |
1867 | ||
1868 | ||
1869 | // this should be data member of AliTRDtrack | |
1870 | Double_t seedQuality[kMaxTracksStack]; | |
1871 | ||
1872 | // unpack control parameters | |
1873 | Int_t config = ipar[0]; | |
eb38ed55 | 1874 | Int_t ntracks = ipar[1]; |
e4f2f73d | 1875 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
e4f2f73d | 1876 | |
1877 | // Init chambers geometry | |
eb38ed55 | 1878 | Int_t ic = 0; while(!(chamber = stack[ic])) ic++; |
1879 | Int_t istack = fGeom->GetChamber(chamber->GetDetector()); | |
e4f2f73d | 1880 | Double_t hL[kNPlanes]; // Tilting angle |
1881 | Float_t padlength[kNPlanes]; // pad lenghts | |
eb38ed55 | 1882 | AliTRDpadPlane *pp = 0x0; |
1883 | for(int iplane=0; iplane<kNPlanes; iplane++){ | |
1884 | pp = fGeom->GetPadPlane(iplane, istack); | |
1885 | hL[iplane] = TMath::Tan(-TMath::DegToRad()*pp->GetTiltingAngle()); | |
1886 | padlength[iplane] = pp->GetLengthIPad(); | |
1887 | } | |
1888 | ||
1889 | if(AliTRDReconstructor::StreamLevel() > 1){ | |
1890 | AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); | |
e4f2f73d | 1891 | } |
1892 | ||
eb38ed55 | 1893 | Int_t nlayers = 0; |
1894 | AliTRDchamberTimeBin *layer[] = {0x0, 0x0, 0x0, 0x0}; | |
1895 | for(int isl=0; isl<kNSeedPlanes; isl++){ | |
1896 | if(!(chamber = stack[planes[isl]])) continue; | |
1897 | if(!(layer[isl] = chamber->GetSeedingLayer(fGeom))) continue; | |
1898 | nlayers++; | |
1899 | //AliInfo(Form("seeding plane %d clusters %d", planes[isl], Int_t(*layer[isl]))); | |
1900 | } | |
1901 | if(nlayers < 4) return 0; | |
1902 | ||
1903 | ||
e4f2f73d | 1904 | // Start finding seeds |
eb38ed55 | 1905 | Double_t cond0[4], cond1[4], cond2[4]; |
e4f2f73d | 1906 | Int_t icl = 0; |
1907 | while((c[3] = (*layer[3])[icl++])){ | |
1908 | if(!c[3]) continue; | |
1909 | layer[0]->BuildCond(c[3], cond0, 0); | |
1910 | layer[0]->GetClusters(cond0, index, ncl); | |
eb38ed55 | 1911 | //printf("Found c[3] candidates 0 %d\n", ncl); |
e4f2f73d | 1912 | Int_t jcl = 0; |
1913 | while(jcl<ncl) { | |
1914 | c[0] = (*layer[0])[index[jcl++]]; | |
1915 | if(!c[0]) continue; | |
1916 | Double_t dx = c[3]->GetX() - c[0]->GetX(); | |
1917 | Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx; | |
1918 | Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx; | |
1919 | layer[1]->BuildCond(c[0], cond1, 1, theta, phi); | |
1920 | layer[1]->GetClusters(cond1, jndex, mcl); | |
eb38ed55 | 1921 | //printf("Found c[0] candidates 1 %d\n", mcl); |
e4f2f73d | 1922 | |
1923 | Int_t kcl = 0; | |
1924 | while(kcl<mcl) { | |
1925 | c[1] = (*layer[1])[jndex[kcl++]]; | |
1926 | if(!c[1]) continue; | |
1927 | layer[2]->BuildCond(c[1], cond2, 2, theta, phi); | |
1928 | c[2] = layer[2]->GetNearestCluster(cond2); | |
eb38ed55 | 1929 | //printf("Found c[1] candidate 2 %p\n", c[2]); |
e4f2f73d | 1930 | if(!c[2]) continue; |
1931 | ||
eb38ed55 | 1932 | // AliInfo("Seeding clusters found. Building seeds ..."); |
1933 | // for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ()); | |
1934 | ||
e4f2f73d | 1935 | for (Int_t il = 0; il < 6; il++) cseed[il].Reset(); |
1936 | ||
eb38ed55 | 1937 | FitRieman(c, chi2); |
e4f2f73d | 1938 | |
e4f2f73d | 1939 | AliTRDseedV1 *tseed = 0x0; |
1940 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ | |
0906e73e | 1941 | Int_t jLayer = planes[iLayer]; |
1942 | tseed = &cseed[jLayer]; | |
0906e73e | 1943 | tseed->SetPlane(jLayer); |
1944 | tseed->SetTilt(hL[jLayer]); | |
1945 | tseed->SetPadLength(padlength[jLayer]); | |
eb38ed55 | 1946 | tseed->SetX0(stack[jLayer]->GetX()); |
1947 | tseed->Init(GetRiemanFitter()); | |
e4f2f73d | 1948 | } |
1949 | ||
1950 | Bool_t isFake = kFALSE; | |
e4f2f73d | 1951 | if(AliTRDReconstructor::StreamLevel() >= 2){ |
eb38ed55 | 1952 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
1953 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
1954 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
1955 | ||
1956 | Float_t yref[4]; | |
1957 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); | |
e4f2f73d | 1958 | Int_t ll = c[3]->GetLabel(0); |
eb38ed55 | 1959 | TTreeSRedirector &cs0 = *fgDebugStreamer; |
e4f2f73d | 1960 | cs0 << "MakeSeeds0" |
1961 | <<"isFake=" << isFake | |
1962 | <<"label=" << ll | |
eb38ed55 | 1963 | <<"chi2z=" << chi2[0] |
1964 | <<"chi2y=" << chi2[1] | |
1965 | <<"yref0=" << yref[0] | |
1966 | <<"yref1=" << yref[1] | |
1967 | <<"yref2=" << yref[2] | |
1968 | <<"yref3=" << yref[3] | |
1969 | <<"c0.=" << c[0] | |
1970 | <<"c1.=" << c[1] | |
1971 | <<"c2.=" << c[2] | |
1972 | <<"c3.=" << c[3] | |
e4f2f73d | 1973 | <<"\n"; |
1974 | } | |
e4f2f73d | 1975 | |
eb38ed55 | 1976 | if(chi2[0] > AliTRDReconstructor::RecoParam()->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
e4f2f73d | 1977 | //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0])); |
1978 | continue; | |
1979 | } | |
eb38ed55 | 1980 | if(chi2[1] > AliTRDReconstructor::RecoParam()->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
e4f2f73d | 1981 | //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1])); |
1982 | continue; | |
1983 | } | |
1984 | //AliInfo("Passed chi2 filter."); | |
1985 | ||
e4f2f73d | 1986 | if(AliTRDReconstructor::StreamLevel() >= 2){ |
1987 | Float_t minmax[2] = { -100.0, 100.0 }; | |
1988 | for (Int_t iLayer = 0; iLayer < 4; iLayer++) { | |
1989 | Float_t max = c[iLayer]->GetZ() + cseed[planes[iLayer]].GetPadLength() * 0.5 + 1.0 - cseed[planes[iLayer]].GetZref(0); | |
1990 | if (max < minmax[1]) minmax[1] = max; | |
1991 | Float_t min = c[iLayer]->GetZ()-cseed[planes[iLayer]].GetPadLength() * 0.5 - 1.0 - cseed[planes[iLayer]].GetZref(0); | |
1992 | if (min > minmax[0]) minmax[0] = min; | |
1993 | } | |
1994 | Double_t xpos[4]; | |
1995 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = layer[l]->GetX(); | |
eb38ed55 | 1996 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
e4f2f73d | 1997 | cstreamer << "MakeSeeds1" |
1998 | << "isFake=" << isFake | |
1999 | << "config=" << config | |
2000 | << "Cl0.=" << c[0] | |
2001 | << "Cl1.=" << c[1] | |
2002 | << "Cl2.=" << c[2] | |
2003 | << "Cl3.=" << c[3] | |
2004 | << "X0=" << xpos[0] //layer[sLayer]->GetX() | |
2005 | << "X1=" << xpos[1] //layer[sLayer + 1]->GetX() | |
2006 | << "X2=" << xpos[2] //layer[sLayer + 2]->GetX() | |
2007 | << "X3=" << xpos[3] //layer[sLayer + 3]->GetX() | |
2008 | << "Y2exp=" << cond2[0] | |
2009 | << "Z2exp=" << cond2[1] | |
2010 | << "Chi2R=" << chi2[0] | |
2011 | << "Chi2Z=" << chi2[1] | |
2012 | << "Seed0.=" << &cseed[planes[0]] | |
2013 | << "Seed1.=" << &cseed[planes[1]] | |
2014 | << "Seed2.=" << &cseed[planes[2]] | |
2015 | << "Seed3.=" << &cseed[planes[3]] | |
2016 | << "Zmin=" << minmax[0] | |
2017 | << "Zmax=" << minmax[1] | |
2018 | << "\n" ; | |
2019 | } | |
eb38ed55 | 2020 | |
e4f2f73d | 2021 | // try attaching clusters to tracklets |
2022 | Int_t nUsedCl = 0; | |
2023 | Int_t nlayers = 0; | |
2024 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ | |
0906e73e | 2025 | Int_t jLayer = planes[iLayer]; |
eb38ed55 | 2026 | if(!cseed[jLayer].AttachClustersIter(stack[jLayer], 5., kFALSE, c[iLayer])) continue; |
0906e73e | 2027 | nUsedCl += cseed[jLayer].GetNUsed(); |
e4f2f73d | 2028 | if(nUsedCl > 25) break; |
2029 | nlayers++; | |
2030 | } | |
2031 | if(nlayers < kNSeedPlanes){ | |
eb38ed55 | 2032 | //AliInfo(Form("Failed updating all seeds %d [%d].", nlayers, kNSeedPlanes)); |
e4f2f73d | 2033 | continue; |
2034 | } | |
2035 | // fit tracklets and cook likelihood | |
eb38ed55 | 2036 | FitRieman(&cseed[0], chi2, &planes[0]); |
e4f2f73d | 2037 | Double_t like = CookLikelihood(&cseed[0], planes, chi2); // to be checked |
eb38ed55 | 2038 | if (TMath::Log(1.E-9 + like) < AliTRDReconstructor::RecoParam()->GetTrackLikelihood()){ |
e4f2f73d | 2039 | //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2040 | continue; | |
2041 | } | |
2042 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); | |
2043 | ||
2044 | ||
2045 | // book preliminary results | |
2046 | seedQuality[ntracks] = like; | |
2047 | fSeedLayer[ntracks] = config;/*sLayer;*/ | |
2048 | ||
2049 | // attach clusters to the extrapolation seeds | |
2050 | Int_t lextrap[2]; | |
2051 | GetExtrapolationConfig(config, lextrap); | |
2052 | Int_t nusedf = 0; // debug value | |
2053 | for(int iLayer=0; iLayer<2; iLayer++){ | |
2054 | Int_t jLayer = lextrap[iLayer]; | |
eb38ed55 | 2055 | if(!(chamber = stack[jLayer])) continue; |
2056 | ||
e4f2f73d | 2057 | // prepare extrapolated seed |
2058 | cseed[jLayer].Reset(); | |
0906e73e | 2059 | cseed[jLayer].SetPlane(jLayer); |
e4f2f73d | 2060 | cseed[jLayer].SetTilt(hL[jLayer]); |
eb38ed55 | 2061 | cseed[jLayer].SetX0(chamber->GetX()); |
0906e73e | 2062 | cseed[jLayer].SetPadLength(padlength[jLayer]); |
e4f2f73d | 2063 | |
2064 | // fit extrapolated seed | |
eb38ed55 | 2065 | FitTiltedRieman(cseed, kTRUE); |
e4f2f73d | 2066 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; |
2067 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; | |
2068 | AliTRDseedV1 tseed = cseed[jLayer]; | |
eb38ed55 | 2069 | if(!tseed.AttachClustersIter(chamber, 1000.)) continue; |
e4f2f73d | 2070 | cseed[jLayer] = tseed; |
2071 | nusedf += cseed[jLayer].GetNUsed(); // debug value | |
e4f2f73d | 2072 | } |
eb38ed55 | 2073 | FitTiltedRieman(cseed, kTRUE); |
e4f2f73d | 2074 | //AliInfo("Extrapolation done."); |
2075 | ||
eb38ed55 | 2076 | if(ImproveSeedQuality(stack, cseed) < 4) continue; |
e4f2f73d | 2077 | //AliInfo("Improve seed quality done."); |
2078 | ||
e4f2f73d | 2079 | // fit full track and cook likelihoods |
eb38ed55 | 2080 | Double_t curv = FitRieman(&cseed[0], chi2); |
2081 | Double_t chi2ZF = chi2[0] / TMath::Max((nlayers - 3.), 1.); | |
2082 | Double_t chi2RF = chi2[1] / TMath::Max((nlayers - 3.), 1.); | |
2083 | ||
2084 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) | |
2085 | Double_t chi2Vals[3]; | |
2086 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE); | |
2087 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); | |
2088 | chi2Vals[2] = chi2ZF; | |
2089 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); | |
e4f2f73d | 2090 | //AliInfo("Hyperplane fit done\n"); |
2091 | ||
2092 | // finalize tracklets | |
2093 | Int_t labels[12]; | |
2094 | Int_t outlab[24]; | |
2095 | Int_t nlab = 0; | |
2096 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
2097 | if (!cseed[iLayer].IsOK()) continue; | |
2098 | ||
2099 | if (cseed[iLayer].GetLabels(0) >= 0) { | |
2100 | labels[nlab] = cseed[iLayer].GetLabels(0); | |
2101 | nlab++; | |
2102 | } | |
2103 | ||
2104 | if (cseed[iLayer].GetLabels(1) >= 0) { | |
2105 | labels[nlab] = cseed[iLayer].GetLabels(1); | |
2106 | nlab++; | |
2107 | } | |
2108 | } | |
2109 | Freq(nlab,labels,outlab,kFALSE); | |
2110 | Int_t label = outlab[0]; | |
2111 | Int_t frequency = outlab[1]; | |
2112 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
2113 | cseed[iLayer].SetFreq(frequency); | |
e4f2f73d | 2114 | cseed[iLayer].SetChi2Z(chi2ZF); |
2115 | } | |
2116 | ||
e4f2f73d | 2117 | if(AliTRDReconstructor::StreamLevel() >= 2){ |
eb38ed55 | 2118 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
e4f2f73d | 2119 | cstreamer << "MakeSeeds2" |
2120 | << "C=" << curv | |
e4f2f73d | 2121 | << "Chi2TR=" << chi2[0] |
2122 | << "Chi2TC=" << chi2[1] | |
2123 | << "Chi2RF=" << chi2RF | |
2124 | << "Chi2ZF=" << chi2ZF | |
e4f2f73d | 2125 | << "Nlayers=" << nlayers |
2126 | << "NUsedS=" << nUsedCl | |
2127 | << "NUsed=" << nusedf | |
e4f2f73d | 2128 | << "Like=" << like |
2129 | << "S0.=" << &cseed[0] | |
2130 | << "S1.=" << &cseed[1] | |
2131 | << "S2.=" << &cseed[2] | |
2132 | << "S3.=" << &cseed[3] | |
2133 | << "S4.=" << &cseed[4] | |
2134 | << "S5.=" << &cseed[5] | |
2135 | << "Label=" << label | |
2136 | << "Freq=" << frequency | |
2137 | << "\n"; | |
2138 | } | |
e4f2f73d | 2139 | |
2140 | ntracks++; | |
2141 | if(ntracks == kMaxTracksStack){ | |
2142 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); | |
eb38ed55 | 2143 | for(int isl=0; isl<4; isl++) delete layer[isl]; |
e4f2f73d | 2144 | return ntracks; |
2145 | } | |
2146 | cseed += 6; | |
2147 | } | |
2148 | } | |
2149 | } | |
2150 | for(int isl=0; isl<4; isl++) delete layer[isl]; | |
2151 | ||
2152 | return ntracks; | |
2153 | } | |
2154 | ||
2155 | //_____________________________________________________________________________ | |
0906e73e | 2156 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params) |
e4f2f73d | 2157 | { |
2158 | // | |
2159 | // Build a TRD track out of tracklet candidates | |
2160 | // | |
2161 | // Parameters : | |
2162 | // seeds : array of tracklets | |
2163 | // params : track parameters (see MakeSeeds() function body for a detailed description) | |
2164 | // | |
2165 | // Output : | |
2166 | // The TRD track. | |
2167 | // | |
2168 | // Detailed description | |
2169 | // | |
2170 | // To be discussed with Marian !! | |
2171 | // | |
2172 | ||
e4f2f73d | 2173 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
2174 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; | |
2175 | Double_t c[15]; | |
2176 | ||
2177 | c[ 0] = 0.2; | |
2178 | c[ 1] = 0.0; c[ 2] = 2.0; | |
2179 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; | |
2180 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; | |
2181 | c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; | |
2182 | ||
0906e73e | 2183 | AliTRDtrackV1 *track = new AliTRDtrackV1(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
e4f2f73d | 2184 | track->PropagateTo(params[0]-5.0); |
2185 | track->ResetCovariance(1); | |
0906e73e | 2186 | Int_t nc = FollowBackProlongation(*track); |
eb38ed55 | 2187 | //AliInfo(Form("N clusters for track %d", nc)); |
0906e73e | 2188 | if (nc < 30) { |
e4f2f73d | 2189 | delete track; |
0906e73e | 2190 | track = 0x0; |
2191 | } else { | |
2192 | // track->CookdEdx(); | |
2193 | // track->CookdEdxTimBin(-1); | |
2194 | // CookLabel(track, 0.9); | |
e4f2f73d | 2195 | } |
2196 | ||
2197 | return track; | |
2198 | } | |
2199 | ||
0906e73e | 2200 | //____________________________________________________________________ |
2201 | void AliTRDtrackerV1::CookLabel(AliKalmanTrack */*pt*/, Float_t /*wrong*/) const | |
2202 | { | |
2203 | // to be implemented, preferably at the level of TRD tracklet. !!!!!!! | |
2204 | } | |
2205 | ||
e4f2f73d | 2206 | //____________________________________________________________________ |
eb38ed55 | 2207 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d | 2208 | { |
2209 | // | |
2210 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst | |
2211 | // | |
2212 | // Parameters : | |
2213 | // layers : Array of propagation layers for a stack/supermodule | |
2214 | // cseed : Array of 6 seeding tracklets which has to be improved | |
2215 | // | |
2216 | // Output : | |
2217 | // cssed : Improved seeds | |
2218 | // | |
2219 | // Detailed description | |
2220 | // | |
2221 | // Iterative procedure in which new clusters are searched for each | |
2222 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) | |
2223 | // can be maximized. If some optimization is found the old seeds are replaced. | |
2224 | // | |
2225 | ||
e4f2f73d | 2226 | // make a local working copy |
eb38ed55 | 2227 | AliTRDtrackingChamber *chamber = 0x0; |
e4f2f73d | 2228 | AliTRDseedV1 bseed[6]; |
eb38ed55 | 2229 | Int_t nLayers = 0; |
e4f2f73d | 2230 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer]; |
eb38ed55 | 2231 | |
e4f2f73d | 2232 | Float_t lastquality = 10000.0; |
2233 | Float_t lastchi2 = 10000.0; | |
2234 | Float_t chi2 = 1000.0; | |
2235 | ||
2236 | for (Int_t iter = 0; iter < 4; iter++) { | |
2237 | Float_t sumquality = 0.0; | |
2238 | Float_t squality[6]; | |
2239 | Int_t sortindexes[6]; | |
2240 | ||
2241 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { | |
2242 | squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : -1.; | |
eb38ed55 | 2243 | sumquality += squality[jLayer]; |
e4f2f73d | 2244 | } |
2245 | if ((sumquality >= lastquality) || (chi2 > lastchi2)) break; | |
2246 | ||
eb38ed55 | 2247 | nLayers = 0; |
e4f2f73d | 2248 | lastquality = sumquality; |
2249 | lastchi2 = chi2; | |
2250 | if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer]; | |
2251 | ||
e4f2f73d | 2252 | TMath::Sort(6, squality, sortindexes, kFALSE); |
2253 | for (Int_t jLayer = 5; jLayer > 1; jLayer--) { | |
2254 | Int_t bLayer = sortindexes[jLayer]; | |
eb38ed55 | 2255 | if(!(chamber = stack[bLayer])) continue; |
2256 | bseed[bLayer].AttachClustersIter(chamber, squality[bLayer], kTRUE); | |
2257 | if(bseed[bLayer].IsOK()) nLayers++; | |
e4f2f73d | 2258 | } |
2259 | ||
eb38ed55 | 2260 | chi2 = FitTiltedRieman(bseed, kTRUE); |
e4f2f73d | 2261 | } // Loop: iter |
eb38ed55 | 2262 | |
2263 | // we are sure that at least 2 tracklets are OK ! | |
2264 | return nLayers+2; | |
e4f2f73d | 2265 | } |
2266 | ||
eb38ed55 | 2267 | //_________________________________________________________________________ |
2268 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){ | |
2269 | // | |
2270 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for | |
2271 | // the track selection | |
2272 | // The likelihood value containes: | |
2273 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit | |
2274 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets | |
2275 | // For all Parameters an exponential dependency is used | |
2276 | // | |
2277 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
2278 | // - Array of chi2 values: | |
2279 | // * Non-Constrained Tilted Riemann fit | |
2280 | // * Vertex-Constrained Tilted Riemann fit | |
2281 | // * z-Direction from Linear fit | |
2282 | // Output: - The calculated track likelihood | |
2283 | // | |
2284 | // debug level 2 | |
2285 | // | |
e4f2f73d | 2286 | |
eb38ed55 | 2287 | Double_t sumdaf = 0, nLayers = 0; |
2288 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
2289 | if(!tracklets[iLayer].IsOK()) continue; | |
2290 | sumdaf += TMath::Abs((tracklets[iLayer].GetYfit(1) - tracklets[iLayer].GetYref(1))/ tracklets[iLayer].GetSigmaY2()); | |
2291 | nLayers++; | |
e4f2f73d | 2292 | } |
eb38ed55 | 2293 | sumdaf /= Float_t (nLayers - 2.0); |
e4f2f73d | 2294 | |
eb38ed55 | 2295 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z |
2296 | Double_t likeChi2TC = TMath::Exp(-chi2[1] * 0.677); // Constrained Tilted Riemann | |
2297 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann | |
2298 | Double_t likeAF = TMath::Exp(-sumdaf * 3.23); | |
2299 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeAF; | |
2300 | ||
2301 | if(AliTRDReconstructor::StreamLevel() >= 2){ | |
2302 | TTreeSRedirector &cstreamer = *fgDebugStreamer; | |
2303 | cstreamer << "CalculateTrackLikelihood0" | |
2304 | << "LikeChi2Z=" << likeChi2Z | |
2305 | << "LikeChi2TR=" << likeChi2TR | |
2306 | << "LikeChi2TC=" << likeChi2TC | |
2307 | << "LikeAF=" << likeAF | |
2308 | << "TrackLikelihood=" << trackLikelihood | |
2309 | << "\n"; | |
2310 | } | |
2311 | ||
2312 | return trackLikelihood; | |
e4f2f73d | 2313 | } |
2314 | ||
2315 | //____________________________________________________________________ | |
eb38ed55 | 2316 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4] |
e4f2f73d | 2317 | , Double_t *chi2) |
2318 | { | |
2319 | // | |
2320 | // Calculate the probability of this track candidate. | |
2321 | // | |
2322 | // Parameters : | |
2323 | // cseeds : array of candidate tracklets | |
2324 | // planes : array of seeding planes (see seeding configuration) | |
2325 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. | |
2326 | // | |
2327 | // Output : | |
2328 | // likelihood value | |
2329 | // | |
2330 | // Detailed description | |
2331 | // | |
2332 | // The track quality is estimated based on the following 4 criteria: | |
2333 | // 1. precision of the rieman fit on the Y direction (likea) | |
2334 | // 2. chi2 on the Y direction (likechi2y) | |
2335 | // 3. chi2 on the Z direction (likechi2z) | |
2336 | // 4. number of attached clusters compared to a reference value | |
2337 | // (see AliTRDrecoParam::fkFindable) (likeN) | |
2338 | // | |
2339 | // The distributions for each type of probabilities are given below as of | |
2340 | // (date). They have to be checked to assure consistency of estimation. | |
2341 | // | |
2342 | ||
e4f2f73d | 2343 | // ratio of the total number of clusters/track which are expected to be found by the tracker. |
eb38ed55 | 2344 | Float_t fgFindable = AliTRDReconstructor::RecoParam()->GetFindableClusters(); |
e4f2f73d | 2345 | |
2346 | ||
2347 | Int_t nclusters = 0; | |
2348 | Double_t sumda = 0.; | |
2349 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ | |
2350 | Int_t jlayer = planes[ilayer]; | |
2351 | nclusters += cseed[jlayer].GetN2(); | |
2352 | sumda += TMath::Abs(cseed[jlayer].GetYfitR(1) - cseed[jlayer].GetYref(1)); | |
2353 | } | |
2354 | Double_t likea = TMath::Exp(-sumda*10.6); | |
2355 | Double_t likechi2y = 0.0000000001; | |
2356 | if (chi2[1] < 0.5) likechi2y += TMath::Exp(-TMath::Sqrt(chi2[1]) * 7.73); | |
2357 | Double_t likechi2z = TMath::Exp(-chi2[0] * 0.088) / TMath::Exp(-chi2[0] * 0.019); | |
2985ffcb | 2358 | Int_t enc = Int_t(fgFindable*4.*fgNTimeBins); // Expected Number Of Clusters, normally 72 |
e4f2f73d | 2359 | Double_t likeN = TMath::Exp(-(enc - nclusters) * 0.19); |
2360 | ||
2361 | Double_t like = likea * likechi2y * likechi2z * likeN; | |
2362 | ||
e4f2f73d | 2363 | //AliInfo(Form("sumda(%f) chi2[0](%f) chi2[1](%f) likea(%f) likechi2y(%f) likechi2z(%f) nclusters(%d) likeN(%f)", sumda, chi2[0], chi2[1], likea, likechi2y, likechi2z, nclusters, likeN)); |
2364 | if(AliTRDReconstructor::StreamLevel() >= 2){ | |
eb38ed55 | 2365 | TTreeSRedirector &cstreamer = *fgDebugStreamer; |
e4f2f73d | 2366 | cstreamer << "CookLikelihood" |
2367 | << "sumda=" << sumda | |
2368 | << "chi0=" << chi2[0] | |
2369 | << "chi1=" << chi2[1] | |
2370 | << "likea=" << likea | |
2371 | << "likechi2y=" << likechi2y | |
2372 | << "likechi2z=" << likechi2z | |
2373 | << "nclusters=" << nclusters | |
2374 | << "likeN=" << likeN | |
2375 | << "like=" << like | |
2376 | << "\n"; | |
2377 | } | |
e4f2f73d | 2378 | |
2379 | return like; | |
2380 | } | |
2381 | ||
eb38ed55 | 2382 | |
e4f2f73d | 2383 | |
2384 | //____________________________________________________________________ | |
0906e73e | 2385 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d | 2386 | { |
2387 | // | |
2388 | // Map seeding configurations to detector planes. | |
2389 | // | |
2390 | // Parameters : | |
2391 | // iconfig : configuration index | |
2392 | // planes : member planes of this configuration. On input empty. | |
2393 | // | |
2394 | // Output : | |
2395 | // planes : contains the planes which are defining the configuration | |
2396 | // | |
2397 | // Detailed description | |
2398 | // | |
2399 | // Here is the list of seeding planes configurations together with | |
2400 | // their topological classification: | |
2401 | // | |
2402 | // 0 - 5432 TQ 0 | |
2403 | // 1 - 4321 TQ 0 | |
2404 | // 2 - 3210 TQ 0 | |
2405 | // 3 - 5321 TQ 1 | |
2406 | // 4 - 4210 TQ 1 | |
2407 | // 5 - 5431 TQ 1 | |
2408 | // 6 - 4320 TQ 1 | |
2409 | // 7 - 5430 TQ 2 | |
2410 | // 8 - 5210 TQ 2 | |
2411 | // 9 - 5421 TQ 3 | |
2412 | // 10 - 4310 TQ 3 | |
2413 | // 11 - 5410 TQ 4 | |
2414 | // 12 - 5420 TQ 5 | |
2415 | // 13 - 5320 TQ 5 | |
2416 | // 14 - 5310 TQ 5 | |
2417 | // | |
2418 | // The topologic quality is modeled as follows: | |
2419 | // 1. The general model is define by the equation: | |
2420 | // p(conf) = exp(-conf/2) | |
2421 | // 2. According to the topologic classification, configurations from the same | |
2422 | // class are assigned the agerage value over the model values. | |
2423 | // 3. Quality values are normalized. | |
2424 | // | |
2425 | // The topologic quality distribution as function of configuration is given below: | |
2426 | //Begin_Html | |
2427 | // <img src="gif/topologicQA.gif"> | |
2428 | //End_Html | |
2429 | // | |
2430 | ||
2431 | switch(iconfig){ | |
2432 | case 0: // 5432 TQ 0 | |
2433 | planes[0] = 2; | |
2434 | planes[1] = 3; | |
2435 | planes[2] = 4; | |
2436 | planes[3] = 5; | |
2437 | break; | |
2438 | case 1: // 4321 TQ 0 | |
2439 | planes[0] = 1; | |
2440 | planes[1] = 2; | |
2441 | planes[2] = 3; | |
2442 | planes[3] = 4; | |
2443 | break; | |
2444 | case 2: // 3210 TQ 0 | |
2445 | planes[0] = 0; | |
2446 | planes[1] = 1; | |
2447 | planes[2] = 2; | |
2448 | planes[3] = 3; | |
2449 | break; | |
2450 | case 3: // 5321 TQ 1 | |
2451 | planes[0] = 1; | |
2452 | planes[1] = 2; | |
2453 | planes[2] = 3; | |
2454 | planes[3] = 5; | |
2455 | break; | |
2456 | case 4: // 4210 TQ 1 | |
2457 | planes[0] = 0; | |
2458 | planes[1] = 1; | |
2459 | planes[2] = 2; | |
2460 | planes[3] = 4; | |
2461 | break; | |
2462 | case 5: // 5431 TQ 1 | |
2463 | planes[0] = 1; | |
2464 | planes[1] = 3; | |
2465 | planes[2] = 4; | |
2466 | planes[3] = 5; | |
2467 | break; | |
2468 | case 6: // 4320 TQ 1 | |
2469 | planes[0] = 0; | |
2470 | planes[1] = 2; | |
2471 | planes[2] = 3; | |
2472 | planes[3] = 4; | |
2473 | break; | |
2474 | case 7: // 5430 TQ 2 | |
2475 | planes[0] = 0; | |
2476 | planes[1] = 3; | |
2477 | planes[2] = 4; | |
2478 | planes[3] = 5; | |
2479 | break; | |
2480 | case 8: // 5210 TQ 2 | |
2481 | planes[0] = 0; | |
2482 | planes[1] = 1; | |
2483 | planes[2] = 2; | |
2484 | planes[3] = 5; | |
2485 | break; | |
2486 | case 9: // 5421 TQ 3 | |
2487 | planes[0] = 1; | |
2488 | planes[1] = 2; | |
2489 | planes[2] = 4; | |
2490 | planes[3] = 5; | |
2491 | break; | |
2492 | case 10: // 4310 TQ 3 | |
2493 | planes[0] = 0; | |
2494 | planes[1] = 1; | |
2495 | planes[2] = 3; | |
2496 | planes[3] = 4; | |
2497 | break; | |
2498 | case 11: // 5410 TQ 4 | |
2499 | planes[0] = 0; | |
2500 | planes[1] = 1; | |
2501 | planes[2] = 4; | |
2502 | planes[3] = 5; | |
2503 | break; | |
2504 | case 12: // 5420 TQ 5 | |
2505 | planes[0] = 0; | |
2506 | planes[1] = 2; | |
2507 | planes[2] = 4; | |
2508 | planes[3] = 5; | |
2509 | break; | |
2510 | case 13: // 5320 TQ 5 | |
2511 | planes[0] = 0; | |
2512 | planes[1] = 2; | |
2513 | planes[2] = 3; | |
2514 | planes[3] = 5; | |
2515 | break; | |
2516 | case 14: // 5310 TQ 5 | |
2517 | planes[0] = 0; | |
2518 | planes[1] = 1; | |
2519 | planes[2] = 3; | |
2520 | planes[3] = 5; | |
2521 | break; | |
2522 | } | |
2523 | } | |
2524 | ||
2525 | //____________________________________________________________________ | |
0906e73e | 2526 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d | 2527 | { |
2528 | // | |
2529 | // Returns the extrapolation planes for a seeding configuration. | |
2530 | // | |
2531 | // Parameters : | |
2532 | // iconfig : configuration index | |
2533 | // planes : planes which are not in this configuration. On input empty. | |
2534 | // | |
2535 | // Output : | |
2536 | // planes : contains the planes which are not in the configuration | |
2537 | // | |
2538 | // Detailed description | |
2539 | // | |
2540 | ||
2541 | switch(iconfig){ | |
2542 | case 0: // 5432 TQ 0 | |
2543 | planes[0] = 1; | |
2544 | planes[1] = 0; | |
2545 | break; | |
2546 | case 1: // 4321 TQ 0 | |
2547 | planes[0] = 5; | |
2548 | planes[1] = 0; | |
2549 | break; | |
2550 | case 2: // 3210 TQ 0 | |
2551 | planes[0] = 4; | |
2552 | planes[1] = 5; | |
2553 | break; | |
2554 | case 3: // 5321 TQ 1 | |
2555 | planes[0] = 4; | |
2556 | planes[1] = 0; | |
2557 | break; | |
2558 | case 4: // 4210 TQ 1 | |
2559 | planes[0] = 5; | |
2560 | planes[1] = 3; | |
2561 | break; | |
2562 | case 5: // 5431 TQ 1 | |
2563 | planes[0] = 2; | |
2564 | planes[1] = 0; | |
2565 | break; | |
2566 | case 6: // 4320 TQ 1 | |
2567 | planes[0] = 5; | |
2568 | planes[1] = 1; | |
2569 | break; | |
2570 | case 7: // 5430 TQ 2 | |
2571 | planes[0] = 2; | |
2572 | planes[1] = 1; | |
2573 | break; | |
2574 | case 8: // 5210 TQ 2 | |
2575 | planes[0] = 4; | |
2576 | planes[1] = 3; | |
2577 | break; | |
2578 | case 9: // 5421 TQ 3 | |
2579 | planes[0] = 3; | |
2580 | planes[1] = 0; | |
2581 | break; | |
2582 | case 10: // 4310 TQ 3 | |
2583 | planes[0] = 5; | |
2584 | planes[1] = 2; | |
2585 | break; | |
2586 | case 11: // 5410 TQ 4 | |
2587 | planes[0] = 3; | |
2588 | planes[1] = 2; | |
2589 | break; | |
2590 | case 12: // 5420 TQ 5 | |
2591 | planes[0] = 3; | |
2592 | planes[1] = 1; | |
2593 | break; | |
2594 | case 13: // 5320 TQ 5 | |
2595 | planes[0] = 4; | |
2596 | planes[1] = 1; | |
2597 | break; | |
2598 | case 14: // 5310 TQ 5 | |
2599 | planes[0] = 4; | |
2600 | planes[1] = 2; | |
2601 | break; | |
2602 | } | |
2603 | } | |
eb38ed55 | 2604 | |
2605 | //____________________________________________________________________ | |
2606 | AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const | |
2607 | { | |
2608 | Int_t ncls = fClusters->GetEntriesFast(); | |
2609 | return idx >= 0 || idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0; | |
2610 | } | |
2611 | ||
2612 | ||
2613 | //_____________________________________________________________________________ | |
2614 | Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist | |
2615 | , Int_t *outlist, Bool_t down) | |
2616 | { | |
2617 | // | |
2618 | // Sort eleements according occurancy | |
2619 | // The size of output array has is 2*n | |
2620 | // | |
2621 | ||
2622 | if (n <= 0) { | |
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | Int_t *sindexS = new Int_t[n]; // Temporary array for sorting | |
2627 | Int_t *sindexF = new Int_t[2*n]; | |
2628 | for (Int_t i = 0; i < n; i++) { | |
2629 | sindexF[i] = 0; | |
2630 | } | |
2631 | ||
2632 | TMath::Sort(n,inlist,sindexS,down); | |
2633 | ||
2634 | Int_t last = inlist[sindexS[0]]; | |
2635 | Int_t val = last; | |
2636 | sindexF[0] = 1; | |
2637 | sindexF[0+n] = last; | |
2638 | Int_t countPos = 0; | |
2639 | ||
2640 | // Find frequency | |
2641 | for (Int_t i = 1; i < n; i++) { | |
2642 | val = inlist[sindexS[i]]; | |
2643 | if (last == val) { | |
2644 | sindexF[countPos]++; | |
2645 | } | |
2646 | else { | |
2647 | countPos++; | |
2648 | sindexF[countPos+n] = val; | |
2649 | sindexF[countPos]++; | |
2650 | last = val; | |
2651 | } | |
2652 | } | |
2653 | if (last == val) { | |
2654 | countPos++; | |
2655 | } | |
2656 | ||
2657 | // Sort according frequency | |
2658 | TMath::Sort(countPos,sindexF,sindexS,kTRUE); | |
2659 | ||
2660 | for (Int_t i = 0; i < countPos; i++) { | |
2661 | outlist[2*i ] = sindexF[sindexS[i]+n]; | |
2662 | outlist[2*i+1] = sindexF[sindexS[i]]; | |
2663 | } | |
2664 | ||
2665 | delete [] sindexS; | |
2666 | delete [] sindexF; | |
2667 | ||
2668 | return countPos; | |
2669 | ||
2670 | } |