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e4f2f73d | 1 | /************************************************************************** |
972ef65e | 2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
e4f2f73d | 15 | |
16 | /* $Id$ */ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // Track finder // | |
21 | // // | |
22 | // Authors: // | |
23 | // Alex Bercuci <A.Bercuci@gsi.de> // | |
24 | // Markus Fasel <M.Fasel@gsi.de> // | |
25 | // // | |
26 | /////////////////////////////////////////////////////////////////////////////// | |
27 | ||
bb56afff | 28 | // #include <Riostream.h> |
29 | // #include <stdio.h> | |
30 | // #include <string.h> | |
e4f2f73d | 31 | |
32 | #include <TBranch.h> | |
bb56afff | 33 | #include <TDirectory.h> |
e4f2f73d | 34 | #include <TLinearFitter.h> |
e4f2f73d | 35 | #include <TTree.h> |
36 | #include <TClonesArray.h> | |
e4f2f73d | 37 | #include <TTreeStream.h> |
38 | ||
39 | #include "AliLog.h" | |
fac58f00 | 40 | #include "AliMathBase.h" |
e4f2f73d | 41 | #include "AliESDEvent.h" |
bb56afff | 42 | #include "AliGeomManager.h" |
e4f2f73d | 43 | #include "AliRieman.h" |
44 | #include "AliTrackPointArray.h" | |
45 | ||
e4f2f73d | 46 | #include "AliTRDgeometry.h" |
47 | #include "AliTRDpadPlane.h" | |
e4f2f73d | 48 | #include "AliTRDcalibDB.h" |
e4f2f73d | 49 | #include "AliTRDReconstructor.h" |
50 | #include "AliTRDCalibraFillHisto.h" | |
e4f2f73d | 51 | #include "AliTRDrecoParam.h" |
bb56afff | 52 | |
53 | #include "AliTRDcluster.h" | |
e4f2f73d | 54 | #include "AliTRDseedV1.h" |
0906e73e | 55 | #include "AliTRDtrackV1.h" |
bb56afff | 56 | #include "AliTRDtrackerV1.h" |
57 | #include "AliTRDtrackerDebug.h" | |
58 | #include "AliTRDtrackingChamber.h" | |
59 | #include "AliTRDchamberTimeBin.h" | |
60 | ||
e4f2f73d | 61 | |
e4f2f73d | 62 | |
63 | ClassImp(AliTRDtrackerV1) | |
eb38ed55 | 64 | |
65 | ||
66 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // | |
67 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // | |
68 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // | |
69 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle | |
70 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation | |
d76231c8 | 71 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
41702fec | 72 | 0.1112, 0.1112, 0.1112, 0.0786, 0.0786, |
73 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, | |
74 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 | |
e4f2f73d | 75 | }; |
2985ffcb | 76 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
eb38ed55 | 77 | AliRieman* AliTRDtrackerV1::fgRieman = 0x0; |
78 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0; | |
79 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0; | |
e4f2f73d | 80 | |
81 | //____________________________________________________________________ | |
3a039a31 | 82 | AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec) |
41702fec | 83 | :AliTracker() |
06b32d95 | 84 | ,fReconstructor(0x0) |
41702fec | 85 | ,fGeom(new AliTRDgeometry()) |
86 | ,fClusters(0x0) | |
87 | ,fTracklets(0x0) | |
88 | ,fTracks(0x0) | |
89 | ,fSieveSeeding(0) | |
e4f2f73d | 90 | { |
41702fec | 91 | // |
92 | // Default constructor. | |
93 | // | |
a7ac01d2 | 94 | AliTRDcalibDB *trd = 0x0; |
95 | if (!(trd = AliTRDcalibDB::Instance())) { | |
41702fec | 96 | AliFatal("Could not get calibration object"); |
97 | } | |
a7ac01d2 | 98 | |
99 | if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins(); | |
41702fec | 100 | |
053767a4 | 101 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
3a039a31 | 102 | |
d611c74f | 103 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) fSeedTB[isl] = 0x0; |
d20df6fc | 104 | |
3a039a31 | 105 | // Initialize debug stream |
06b32d95 | 106 | if(rec) SetReconstructor(rec); |
eb38ed55 | 107 | } |
108 | ||
e4f2f73d | 109 | //____________________________________________________________________ |
110 | AliTRDtrackerV1::~AliTRDtrackerV1() | |
111 | { | |
41702fec | 112 | // |
113 | // Destructor | |
114 | // | |
115 | ||
f7ab3117 | 116 | if(fgRieman) delete fgRieman; fgRieman = 0x0; |
117 | if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0; | |
118 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0; | |
d611c74f | 119 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl]; |
41702fec | 120 | if(fTracks) {fTracks->Delete(); delete fTracks;} |
121 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} | |
48f8adf3 | 122 | if(fClusters) { |
123 | fClusters->Delete(); delete fClusters; | |
124 | } | |
41702fec | 125 | if(fGeom) delete fGeom; |
e4f2f73d | 126 | } |
127 | ||
128 | //____________________________________________________________________ | |
129 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) | |
130 | { | |
41702fec | 131 | // |
132 | // Steering stand alone tracking for full TRD detector | |
133 | // | |
134 | // Parameters : | |
135 | // esd : The ESD event. On output it contains | |
136 | // the ESD tracks found in TRD. | |
137 | // | |
138 | // Output : | |
139 | // Number of tracks found in the TRD detector. | |
140 | // | |
141 | // Detailed description | |
142 | // 1. Launch individual SM trackers. | |
143 | // See AliTRDtrackerV1::Clusters2TracksSM() for details. | |
144 | // | |
145 | ||
3a039a31 | 146 | if(!fReconstructor->GetRecoParam() ){ |
147 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); | |
41702fec | 148 | return 0; |
149 | } | |
150 | ||
151 | //AliInfo("Start Track Finder ..."); | |
152 | Int_t ntracks = 0; | |
053767a4 | 153 | for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){ |
41702fec | 154 | // for(int ism=1; ism<2; ism++){ |
155 | //AliInfo(Form("Processing supermodule %i ...", ism)); | |
156 | ntracks += Clusters2TracksSM(ism, esd); | |
157 | } | |
158 | AliInfo(Form("Number of found tracks : %d", ntracks)); | |
159 | return ntracks; | |
e4f2f73d | 160 | } |
161 | ||
0906e73e | 162 | |
163 | //_____________________________________________________________________________ | |
eb38ed55 | 164 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
0906e73e | 165 | { |
41702fec | 166 | //AliInfo(Form("Asking for tracklet %d", index)); |
167 | ||
84eab75a | 168 | // reset position of the point before using it |
169 | p.SetXYZ(0., 0., 0.); | |
2f7514a6 | 170 | AliTRDseedV1 *tracklet = GetTracklet(index); |
171 | if (!tracklet) return kFALSE; | |
84eab75a | 172 | |
41702fec | 173 | // get detector for this tracklet |
84eab75a | 174 | Int_t idet = tracklet->GetDetector(); |
41702fec | 175 | |
176 | Double_t local[3]; | |
177 | local[0] = tracklet->GetX0(); | |
178 | local[1] = tracklet->GetYfit(0); | |
179 | local[2] = tracklet->GetZfit(0); | |
180 | Double_t global[3]; | |
181 | fGeom->RotateBack(idet, local, global); | |
182 | p.SetXYZ(global[0],global[1],global[2]); | |
183 | ||
184 | ||
185 | // setting volume id | |
186 | AliGeomManager::ELayerID iLayer = AliGeomManager::kTRD1; | |
053767a4 | 187 | switch (fGeom->GetLayer(idet)) { |
41702fec | 188 | case 0: |
189 | iLayer = AliGeomManager::kTRD1; | |
190 | break; | |
191 | case 1: | |
192 | iLayer = AliGeomManager::kTRD2; | |
193 | break; | |
194 | case 2: | |
195 | iLayer = AliGeomManager::kTRD3; | |
196 | break; | |
197 | case 3: | |
198 | iLayer = AliGeomManager::kTRD4; | |
199 | break; | |
200 | case 4: | |
201 | iLayer = AliGeomManager::kTRD5; | |
202 | break; | |
203 | case 5: | |
204 | iLayer = AliGeomManager::kTRD6; | |
205 | break; | |
206 | }; | |
053767a4 | 207 | Int_t modId = fGeom->GetSector(idet) * fGeom->Nstack() + fGeom->GetStack(idet); |
41702fec | 208 | UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId); |
209 | p.SetVolumeID(volid); | |
210 | ||
211 | return kTRUE; | |
0906e73e | 212 | } |
213 | ||
eb38ed55 | 214 | //____________________________________________________________________ |
215 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() | |
216 | { | |
41702fec | 217 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); |
218 | return fgTiltedRieman; | |
eb38ed55 | 219 | } |
0906e73e | 220 | |
eb38ed55 | 221 | //____________________________________________________________________ |
222 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() | |
223 | { | |
41702fec | 224 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); |
225 | return fgTiltedRiemanConstrained; | |
eb38ed55 | 226 | } |
41702fec | 227 | |
eb38ed55 | 228 | //____________________________________________________________________ |
229 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() | |
230 | { | |
fac58f00 | 231 | if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer); |
41702fec | 232 | return fgRieman; |
eb38ed55 | 233 | } |
41702fec | 234 | |
0906e73e | 235 | //_____________________________________________________________________________ |
236 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) | |
237 | { | |
41702fec | 238 | // |
239 | // Gets seeds from ESD event. The seeds are AliTPCtrack's found and | |
240 | // backpropagated by the TPC tracker. Each seed is first propagated | |
241 | // to the TRD, and then its prolongation is searched in the TRD. | |
242 | // If sufficiently long continuation of the track is found in the TRD | |
243 | // the track is updated, otherwise it's stored as originaly defined | |
244 | // by the TPC tracker. | |
245 | // | |
246 | ||
247 | // Calibration monitor | |
248 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); | |
249 | if (!calibra) AliInfo("Could not get Calibra instance\n"); | |
250 | ||
251 | Int_t found = 0; // number of tracks found | |
252 | Float_t foundMin = 20.0; | |
253 | ||
d611c74f | 254 | Float_t *quality = 0x0; |
255 | Int_t *index = 0x0; | |
41702fec | 256 | Int_t nSeed = event->GetNumberOfTracks(); |
d611c74f | 257 | if(nSeed){ |
258 | quality = new Float_t[nSeed]; | |
259 | index = new Int_t[nSeed]; | |
260 | for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) { | |
261 | AliESDtrack *seed = event->GetTrack(iSeed); | |
262 | Double_t covariance[15]; | |
263 | seed->GetExternalCovariance(covariance); | |
264 | quality[iSeed] = covariance[0] + covariance[2]; | |
265 | } | |
266 | // Sort tracks according to covariance of local Y and Z | |
b1957d3c | 267 | TMath::Sort(nSeed, quality, index,kFALSE); |
41702fec | 268 | } |
41702fec | 269 | |
270 | // Backpropagate all seeds | |
271 | Int_t expectedClr; | |
272 | AliTRDtrackV1 track; | |
273 | for (Int_t iSeed = 0; iSeed < nSeed; iSeed++) { | |
274 | ||
275 | // Get the seeds in sorted sequence | |
276 | AliESDtrack *seed = event->GetTrack(index[iSeed]); | |
277 | ||
278 | // Check the seed status | |
279 | ULong_t status = seed->GetStatus(); | |
280 | if ((status & AliESDtrack::kTPCout) == 0) continue; | |
281 | if ((status & AliESDtrack::kTRDout) != 0) continue; | |
282 | ||
283 | // Do the back prolongation | |
284 | new(&track) AliTRDtrackV1(*seed); | |
215f7116 | 285 | track.SetReconstructor(fReconstructor); |
f29f13a6 | 286 | track.SetKink(Bool_t(seed->GetKinkIndex(0))); |
41702fec | 287 | //Int_t lbl = seed->GetLabel(); |
288 | //track.SetSeedLabel(lbl); | |
e4d4864b | 289 | |
290 | // Make backup and mark entrance in the TRD | |
76b60503 | 291 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); |
292 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
27fbeba8 | 293 | Float_t p4 = track.GetC(track.GetBz()); |
ae3fbe1f | 294 | expectedClr = FollowBackProlongation(track); |
295 | ||
296 | if (expectedClr<0) continue; // Back prolongation failed | |
297 | ||
298 | if(expectedClr){ | |
d611c74f | 299 | found++; |
41702fec | 300 | // computes PID for track |
301 | track.CookPID(); | |
302 | // update calibration references using this track | |
303 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); | |
304 | // save calibration object | |
224f357f | 305 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0 /*&& quality TODO*/){ |
306 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); | |
307 | calibTrack->SetOwner(); | |
308 | seed->AddCalibObject(calibTrack); | |
309 | } | |
310 | //update ESD track | |
41702fec | 311 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { |
2389e96f | 312 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
41702fec | 313 | track.UpdateESDtrack(seed); |
41702fec | 314 | } |
315 | } | |
316 | ||
27fbeba8 | 317 | if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) { |
e3cf3d02 | 318 | |
41702fec | 319 | // Make backup for back propagation |
41702fec | 320 | Int_t foundClr = track.GetNumberOfClusters(); |
321 | if (foundClr >= foundMin) { | |
41702fec | 322 | track.CookLabel(1. - fgkLabelFraction); |
f29f13a6 | 323 | //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); |
41702fec | 324 | |
325 | // Sign only gold tracks | |
326 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { | |
f29f13a6 | 327 | //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track); |
41702fec | 328 | } |
329 | Bool_t isGold = kFALSE; | |
330 | ||
331 | // Full gold track | |
332 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { | |
333 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
334 | ||
335 | isGold = kTRUE; | |
336 | } | |
337 | ||
338 | // Almost gold track | |
339 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { | |
340 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); | |
341 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
342 | ||
343 | isGold = kTRUE; | |
344 | } | |
345 | ||
346 | if ((!isGold) && (track.GetBackupTrack())) { | |
347 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { | |
348 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
349 | isGold = kTRUE; | |
350 | } | |
351 | } | |
352 | ||
353 | //if ((track->StatusForTOF() > 0) && (track->GetNCross() == 0) && (Float_t(track->GetNumberOfClusters()) / Float_t(track->GetNExpected()) > 0.4)) { | |
354 | //seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup); | |
355 | //} | |
356 | } | |
357 | } | |
358 | ||
359 | // Propagation to the TOF (I.Belikov) | |
360 | if (track.IsStopped() == kFALSE) { | |
361 | Double_t xtof = 371.0; | |
362 | Double_t xTOF0 = 370.0; | |
363 | ||
27fbeba8 | 364 | Double_t c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX()); |
41702fec | 365 | if (TMath::Abs(c2) >= 0.99) continue; |
366 | ||
ae3fbe1f | 367 | if (!PropagateToX(track, xTOF0, fgkMaxStep)) continue; |
41702fec | 368 | |
369 | // Energy losses taken to the account - check one more time | |
27fbeba8 | 370 | c2 = track.GetSnp() + track.GetC(track.GetBz()) * (xtof - track.GetX()); |
41702fec | 371 | if (TMath::Abs(c2) >= 0.99) continue; |
372 | ||
373 | //if (!PropagateToX(*track,xTOF0,fgkMaxStep)) { | |
374 | // fHBackfit->Fill(7); | |
375 | //delete track; | |
376 | // continue; | |
377 | //} | |
378 | ||
379 | Double_t ymax = xtof * TMath::Tan(0.5 * AliTRDgeometry::GetAlpha()); | |
380 | Double_t y; | |
381 | track.GetYAt(xtof,GetBz(),y); | |
382 | if (y > ymax) { | |
383 | if (!track.Rotate( AliTRDgeometry::GetAlpha())) continue; | |
384 | }else if (y < -ymax) { | |
385 | if (!track.Rotate(-AliTRDgeometry::GetAlpha())) continue; | |
386 | } | |
387 | ||
388 | if (track.PropagateTo(xtof)) { | |
389 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); | |
390 | track.UpdateESDtrack(seed); | |
41702fec | 391 | } |
392 | } else { | |
393 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { | |
394 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); | |
395 | ||
396 | track.UpdateESDtrack(seed); | |
41702fec | 397 | } |
398 | } | |
399 | ||
400 | seed->SetTRDQuality(track.StatusForTOF()); | |
401 | seed->SetTRDBudget(track.GetBudget(0)); | |
402 | } | |
d611c74f | 403 | if(index) delete [] index; |
404 | if(quality) delete [] quality; | |
41702fec | 405 | |
406 | ||
407 | AliInfo(Form("Number of seeds: %d", nSeed)); | |
408 | AliInfo(Form("Number of back propagated TRD tracks: %d", found)); | |
409 | ||
d611c74f | 410 | // run stand alone tracking |
3a039a31 | 411 | if (fReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec | 412 | |
413 | return 0; | |
0906e73e | 414 | } |
415 | ||
416 | ||
417 | //____________________________________________________________________ | |
418 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) | |
419 | { | |
41702fec | 420 | // |
421 | // Refits tracks within the TRD. The ESD event is expected to contain seeds | |
422 | // at the outer part of the TRD. | |
423 | // The tracks are propagated to the innermost time bin | |
424 | // of the TRD and the ESD event is updated | |
425 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) | |
426 | // | |
427 | ||
428 | Int_t nseed = 0; // contor for loaded seeds | |
429 | Int_t found = 0; // contor for updated TRD tracks | |
430 | ||
431 | ||
432 | AliTRDtrackV1 track; | |
433 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { | |
434 | AliESDtrack *seed = event->GetTrack(itrack); | |
435 | new(&track) AliTRDtrackV1(*seed); | |
436 | ||
437 | if (track.GetX() < 270.0) { | |
438 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
439 | continue; | |
440 | } | |
441 | ||
e3cf3d02 | 442 | // reject tracks which failed propagation in the TRD or |
443 | // are produced by the TRD stand alone tracker | |
41702fec | 444 | ULong_t status = seed->GetStatus(); |
e3cf3d02 | 445 | if(!(status & AliESDtrack::kTRDout)) continue; |
446 | if(!(status & AliESDtrack::kTRDin)) continue; | |
41702fec | 447 | nseed++; |
448 | ||
449 | track.ResetCovariance(50.0); | |
450 | ||
451 | // do the propagation and processing | |
452 | Bool_t kUPDATE = kFALSE; | |
453 | Double_t xTPC = 250.0; | |
454 | if(FollowProlongation(track)){ | |
455 | // Prolongate to TPC | |
456 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update | |
e3cf3d02 | 457 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
458 | found++; | |
459 | kUPDATE = kTRUE; | |
460 | } | |
461 | ||
462 | // Update the friend track | |
463 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ | |
464 | TObject *o = 0x0; Int_t ic = 0; | |
465 | AliTRDtrackV1 *calibTrack = 0x0; | |
466 | while((o = seed->GetCalibObject(ic++))){ | |
467 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; | |
468 | calibTrack->SetTrackHigh(track.GetTrackHigh()); | |
469 | } | |
41702fec | 470 | } |
e3cf3d02 | 471 | } |
41702fec | 472 | |
473 | // Prolongate to TPC without update | |
474 | if(!kUPDATE) { | |
475 | AliTRDtrackV1 tt(*seed); | |
e3cf3d02 | 476 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup); |
41702fec | 477 | } |
478 | } | |
479 | AliInfo(Form("Number of loaded seeds: %d",nseed)); | |
480 | AliInfo(Form("Number of found tracks from loaded seeds: %d",found)); | |
481 | ||
482 | return 0; | |
0906e73e | 483 | } |
484 | ||
0906e73e | 485 | //____________________________________________________________________ |
486 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) | |
487 | { | |
41702fec | 488 | // Extrapolates the TRD track in the TPC direction. |
489 | // | |
490 | // Parameters | |
491 | // t : the TRD track which has to be extrapolated | |
492 | // | |
493 | // Output | |
494 | // number of clusters attached to the track | |
495 | // | |
496 | // Detailed description | |
497 | // | |
498 | // Starting from current radial position of track <t> this function | |
499 | // extrapolates the track through the 6 TRD layers. The following steps | |
500 | // are being performed for each plane: | |
501 | // 1. prepare track: | |
502 | // a. get plane limits in the local x direction | |
503 | // b. check crossing sectors | |
504 | // c. check track inclination | |
505 | // 2. search tracklet in the tracker list (see GetTracklet() for details) | |
506 | // 3. evaluate material budget using the geo manager | |
507 | // 4. propagate and update track using the tracklet information. | |
508 | // | |
509 | // Debug level 2 | |
510 | // | |
511 | ||
e3cf3d02 | 512 | Bool_t kStoreIn = kTRUE; |
41702fec | 513 | Int_t nClustersExpected = 0; |
e3cf3d02 | 514 | for (Int_t iplane = kNPlanes; iplane--;) { |
41702fec | 515 | Int_t index = 0; |
516 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); | |
517 | if(!tracklet) continue; | |
518 | if(!tracklet->IsOK()) AliWarning("tracklet not OK"); | |
519 | ||
e3cf3d02 | 520 | Double_t x = tracklet->GetX();//GetX0(); |
41702fec | 521 | // reject tracklets which are not considered for inward refit |
522 | if(x > t.GetX()+fgkMaxStep) continue; | |
523 | ||
524 | // append tracklet to track | |
525 | t.SetTracklet(tracklet, index); | |
526 | ||
527 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; | |
528 | if (!AdjustSector(&t)) break; | |
529 | ||
530 | // Start global position | |
531 | Double_t xyz0[3]; | |
532 | t.GetXYZ(xyz0); | |
533 | ||
534 | // End global position | |
535 | Double_t alpha = t.GetAlpha(), y, z; | |
536 | if (!t.GetProlongation(x,y,z)) break; | |
537 | Double_t xyz1[3]; | |
538 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
539 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
540 | xyz1[2] = z; | |
541 | ||
51a23065 | 542 | Double_t length = TMath::Sqrt( |
543 | (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) + | |
544 | (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) + | |
545 | (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2]) | |
546 | ); | |
547 | if(length>0.){ | |
548 | // Get material budget | |
549 | Double_t param[7]; | |
550 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break; | |
551 | Double_t xrho= param[0]*param[4]; | |
552 | Double_t xx0 = param[1]; // Get mean propagation parameters | |
553 | ||
554 | // Propagate and update | |
555 | t.PropagateTo(x, xx0, xrho); | |
556 | if (!AdjustSector(&t)) break; | |
557 | } | |
e3cf3d02 | 558 | if(kStoreIn){ |
559 | t.SetTrackHigh(); | |
560 | kStoreIn = kFALSE; | |
561 | } | |
562 | ||
41702fec | 563 | Double_t maxChi2 = t.GetPredictedChi2(tracklet); |
564 | if (maxChi2 < 1e+10 && t.Update(tracklet, maxChi2)){ | |
565 | nClustersExpected += tracklet->GetN(); | |
566 | } | |
567 | } | |
568 | ||
3a039a31 | 569 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec | 570 | Int_t index; |
51a23065 | 571 | for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){ |
41702fec | 572 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
573 | if(!tracklet) continue; | |
574 | t.SetTracklet(tracklet, index); | |
575 | } | |
576 | ||
577 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
29f95561 | 578 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 579 | cstreamer << "FollowProlongation" |
580 | << "EventNumber=" << eventNumber | |
581 | << "ncl=" << nClustersExpected | |
582 | //<< "track.=" << &t | |
583 | << "\n"; | |
584 | } | |
585 | ||
586 | return nClustersExpected; | |
0906e73e | 587 | |
588 | } | |
589 | ||
590 | //_____________________________________________________________________________ | |
591 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) | |
592 | { | |
41702fec | 593 | // Extrapolates the TRD track in the TOF direction. |
594 | // | |
595 | // Parameters | |
596 | // t : the TRD track which has to be extrapolated | |
597 | // | |
598 | // Output | |
599 | // number of clusters attached to the track | |
600 | // | |
601 | // Detailed description | |
602 | // | |
603 | // Starting from current radial position of track <t> this function | |
604 | // extrapolates the track through the 6 TRD layers. The following steps | |
605 | // are being performed for each plane: | |
606 | // 1. prepare track: | |
607 | // a. get plane limits in the local x direction | |
608 | // b. check crossing sectors | |
609 | // c. check track inclination | |
610 | // 2. build tracklet (see AliTRDseed::AttachClusters() for details) | |
611 | // 3. evaluate material budget using the geo manager | |
612 | // 4. propagate and update track using the tracklet information. | |
613 | // | |
614 | // Debug level 2 | |
615 | // | |
616 | ||
617 | Int_t nClustersExpected = 0; | |
b1957d3c | 618 | Double_t clength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); |
41702fec | 619 | AliTRDtrackingChamber *chamber = 0x0; |
620 | ||
3b57a3f7 | 621 | AliTRDseedV1 tracklet, *ptrTracklet = 0x0; |
181d2c97 | 622 | // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array |
623 | AliTRDseedV1 *tracklets[kNPlanes]; | |
624 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); | |
625 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
626 | tracklets[ip] = t.GetTracklet(ip); | |
627 | t.UnsetTracklet(ip); | |
628 | } | |
e3cf3d02 | 629 | Bool_t kStoreIn = kTRUE; |
630 | ||
3b57a3f7 | 631 | |
053767a4 | 632 | // Loop through the TRD layers |
e3cf3d02 | 633 | for (Int_t ilayer = 0; ilayer < kNPlanes; ilayer++) { |
41702fec | 634 | // BUILD TRACKLET IF NOT ALREADY BUILT |
b1957d3c | 635 | Double_t x = 0., x0, y, z, alpha; |
181d2c97 | 636 | ptrTracklet = tracklets[ilayer]; |
41702fec | 637 | if(!ptrTracklet){ |
053767a4 | 638 | ptrTracklet = new(&tracklet) AliTRDseedV1(ilayer); |
43d6ad34 | 639 | ptrTracklet->SetReconstructor(fReconstructor); |
f29f13a6 | 640 | ptrTracklet->SetKink(t.IsKink()); |
41702fec | 641 | alpha = t.GetAlpha(); |
053767a4 | 642 | Int_t sector = Int_t(alpha/AliTRDgeometry::GetAlpha() + (alpha>0. ? 0 : AliTRDgeometry::kNsector)); |
41702fec | 643 | |
644 | if(!fTrSec[sector].GetNChambers()) continue; | |
645 | ||
053767a4 | 646 | if((x = fTrSec[sector].GetX(ilayer)) < 1.) continue; |
41702fec | 647 | |
b1957d3c | 648 | // Propagate closer to the current layer |
649 | x0 = x - 1.5*clength; | |
650 | if (x0 > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x0-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/; | |
651 | if (!AdjustSector(&t)) return -1/*nClustersExpected*/; | |
652 | if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/; | |
653 | ||
35c24814 | 654 | if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/; |
053767a4 | 655 | Int_t stack = fGeom->GetStack(z, ilayer); |
41702fec | 656 | Int_t nCandidates = stack >= 0 ? 1 : 2; |
657 | z -= stack >= 0 ? 0. : 4.; | |
658 | ||
659 | for(int icham=0; icham<nCandidates; icham++, z+=8){ | |
053767a4 | 660 | if((stack = fGeom->GetStack(z, ilayer)) < 0) continue; |
41702fec | 661 | |
053767a4 | 662 | if(!(chamber = fTrSec[sector].GetChamber(stack, ilayer))) continue; |
41702fec | 663 | |
3a039a31 | 664 | if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec | 665 | |
666 | x = chamber->GetX(); | |
667 | ||
053767a4 | 668 | AliTRDpadPlane *pp = fGeom->GetPadPlane(ilayer, stack); |
aec26713 | 669 | tracklet.SetTilt(TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle())); |
41702fec | 670 | tracklet.SetPadLength(pp->GetLengthIPad()); |
ae4e8b84 | 671 | tracklet.SetDetector(chamber->GetDetector()); |
41702fec | 672 | tracklet.SetX0(x); |
b1957d3c | 673 | tracklet.UpDate(&t); |
674 | // if(!tracklet.Init(&t)){ | |
675 | // t.SetStopped(kTRUE); | |
676 | // return nClustersExpected; | |
677 | // } | |
678 | if(!tracklet.AttachClusters(chamber, kTRUE)) continue; | |
679 | //if(!tracklet.AttachClustersIter(chamber, 1000.)) continue; | |
680 | //tracklet.Init(&t); | |
41702fec | 681 | |
3a039a31 | 682 | if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec | 683 | |
684 | break; | |
685 | } | |
f29f13a6 | 686 | ptrTracklet->UpdateUsed(); |
687 | } | |
41702fec | 688 | if(!ptrTracklet->IsOK()){ |
f29f13a6 | 689 | ptrTracklet->Reset(); |
41702fec | 690 | if(x < 1.) continue; //temporary |
35c24814 | 691 | if(!PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/; |
692 | if(!AdjustSector(&t)) return -1/*nClustersExpected*/; | |
693 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/; | |
41702fec | 694 | continue; |
695 | } | |
696 | ||
697 | // Propagate closer to the current chamber if neccessary | |
698 | x -= clength; | |
35c24814 | 699 | if (x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x-fgkMaxStep, fgkMaxStep)) return -1/*nClustersExpected*/; |
700 | if (!AdjustSector(&t)) return -1/*nClustersExpected*/; | |
701 | if (TMath::Abs(t.GetSnp()) > fgkMaxSnp) return -1/*nClustersExpected*/; | |
41702fec | 702 | |
703 | // load tracklet to the tracker and the track | |
f29f13a6 | 704 | ptrTracklet->UseClusters(); |
b1957d3c | 705 | ptrTracklet->Fit(kFALSE); // no tilt correction |
41702fec | 706 | ptrTracklet = SetTracklet(ptrTracklet); |
707 | t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); | |
708 | ||
709 | ||
710 | // Calculate the mean material budget along the path inside the chamber | |
711 | //Calculate global entry and exit positions of the track in chamber (only track prolongation) | |
712 | Double_t xyz0[3]; // entry point | |
713 | t.GetXYZ(xyz0); | |
714 | alpha = t.GetAlpha(); | |
e3cf3d02 | 715 | x = ptrTracklet->GetX(); //GetX0(); |
35c24814 | 716 | if (!t.GetProlongation(x, y, z)) return -1/*nClustersExpected*/; |
41702fec | 717 | Double_t xyz1[3]; // exit point |
718 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
719 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
720 | xyz1[2] = z; | |
721 | Double_t param[7]; | |
83dea92e | 722 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return -1; |
41702fec | 723 | // The mean propagation parameters |
724 | Double_t xrho = param[0]*param[4]; // density*length | |
725 | Double_t xx0 = param[1]; // radiation length | |
726 | ||
727 | // Propagate and update track | |
35c24814 | 728 | if (!t.PropagateTo(x, xx0, xrho)) return -1/*nClustersExpected*/; |
729 | if (!AdjustSector(&t)) return -1/*nClustersExpected*/; | |
e3cf3d02 | 730 | |
731 | if(kStoreIn){ | |
732 | t.SetTrackLow(); | |
733 | kStoreIn = kFALSE; | |
734 | } | |
41702fec | 735 | Double_t maxChi2 = t.GetPredictedChi2(ptrTracklet); |
35c24814 | 736 | if (!t.Update(ptrTracklet, maxChi2)) return -1/*nClustersExpected*/; |
b1957d3c | 737 | ptrTracklet->UpDate(&t); |
738 | ||
ae3fbe1f | 739 | if (maxChi2<1e+10) { |
41702fec | 740 | nClustersExpected += ptrTracklet->GetN(); |
741 | //t.SetTracklet(&tracklet, index); | |
742 | } | |
743 | // Reset material budget if 2 consecutive gold | |
053767a4 | 744 | if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec | 745 | |
746 | // Make backup of the track until is gold | |
747 | // TO DO update quality check of the track. | |
748 | // consider comparison with fTimeBinsRange | |
749 | Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins); | |
750 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); | |
751 | //printf("tracklet.GetChi2() %f [< 18.0]\n", tracklet.GetChi2()); | |
752 | //printf("ratio0 %f [> 0.8]\n", ratio0); | |
753 | //printf("ratio1 %f [> 0.6]\n", ratio1); | |
754 | //printf("ratio0+ratio1 %f [> 1.5]\n", ratio0+ratio1); | |
755 | //printf("t.GetNCross() %d [== 0]\n", t.GetNCross()); | |
756 | //printf("TMath::Abs(t.GetSnp()) %f [< 0.85]\n", TMath::Abs(t.GetSnp())); | |
757 | //printf("t.GetNumberOfClusters() %d [> 20]\n", t.GetNumberOfClusters()); | |
758 | ||
759 | if (//(tracklet.GetChi2() < 18.0) && TO DO check with FindClusters and move it to AliTRDseed::Update | |
760 | (ratio0 > 0.8) && | |
761 | //(ratio1 > 0.6) && | |
762 | //(ratio0+ratio1 > 1.5) && | |
763 | (t.GetNCross() == 0) && | |
764 | (TMath::Abs(t.GetSnp()) < 0.85) && | |
e3cf3d02 | 765 | (t.GetNumberOfClusters() > 20)){ |
766 | t.MakeBackupTrack(); | |
767 | } | |
053767a4 | 768 | } // end layers loop |
41702fec | 769 | |
3a039a31 | 770 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
29f95561 | 771 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 772 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
773 | //AliTRDtrackV1 *debugTrack = new AliTRDtrackV1(t); | |
774 | //debugTrack->SetOwner(); | |
775 | cstreamer << "FollowBackProlongation" | |
776 | << "EventNumber=" << eventNumber | |
777 | << "ncl=" << nClustersExpected | |
778 | //<< "track.=" << debugTrack | |
779 | << "\n"; | |
780 | } | |
781 | ||
782 | return nClustersExpected; | |
0906e73e | 783 | } |
784 | ||
eb38ed55 | 785 | //_________________________________________________________________________ |
786 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){ | |
41702fec | 787 | // |
788 | // Fits a Riemann-circle to the given points without tilting pad correction. | |
789 | // The fit is performed using an instance of the class AliRieman (equations | |
790 | // and transformations see documentation of this class) | |
791 | // Afterwards all the tracklets are Updated | |
792 | // | |
793 | // Parameters: - Array of tracklets (AliTRDseedV1) | |
794 | // - Storage for the chi2 values (beginning with direction z) | |
795 | // - Seeding configuration | |
796 | // Output: - The curvature | |
797 | // | |
798 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
799 | fitter->Reset(); | |
800 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; | |
801 | Int_t *ppl = &allplanes[0]; | |
802 | Int_t maxLayers = 6; | |
803 | if(planes){ | |
804 | maxLayers = 4; | |
805 | ppl = planes; | |
806 | } | |
807 | for(Int_t il = 0; il < maxLayers; il++){ | |
808 | if(!tracklets[ppl[il]].IsOK()) continue; | |
e3cf3d02 | 809 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10); |
41702fec | 810 | } |
811 | fitter->Update(); | |
812 | // Set the reference position of the fit and calculate the chi2 values | |
813 | memset(chi2, 0, sizeof(Double_t) * 2); | |
814 | for(Int_t il = 0; il < maxLayers; il++){ | |
815 | // Reference positions | |
816 | tracklets[ppl[il]].Init(fitter); | |
817 | ||
818 | // chi2 | |
819 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; | |
820 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); | |
821 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); | |
822 | } | |
823 | return fitter->GetC(); | |
eb38ed55 | 824 | } |
825 | ||
826 | //_________________________________________________________________________ | |
827 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) | |
828 | { | |
41702fec | 829 | // |
830 | // Performs a Riemann helix fit using the seedclusters as spacepoints | |
831 | // Afterwards the chi2 values are calculated and the seeds are updated | |
832 | // | |
833 | // Parameters: - The four seedclusters | |
834 | // - The tracklet array (AliTRDseedV1) | |
835 | // - The seeding configuration | |
836 | // - Chi2 array | |
837 | // | |
838 | // debug level 2 | |
839 | // | |
840 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
841 | fitter->Reset(); | |
842 | for(Int_t i = 0; i < 4; i++) | |
843 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1, 10); | |
844 | fitter->Update(); | |
845 | ||
846 | ||
847 | // Update the seed and calculated the chi2 value | |
848 | chi2[0] = 0; chi2[1] = 0; | |
849 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ | |
850 | // chi2 | |
851 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); | |
852 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); | |
853 | } | |
eb38ed55 | 854 | } |
855 | ||
856 | ||
857 | //_________________________________________________________________________ | |
858 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) | |
859 | { | |
41702fec | 860 | // |
861 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is | |
862 | // assumed that the vertex position is set to 0. | |
863 | // This method is very usefull for high-pt particles | |
864 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 | |
865 | // x0, y0: Center of the circle | |
866 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) | |
867 | // zc: center of the pad row | |
868 | // Equation which has to be fitted (after transformation): | |
869 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 | |
870 | // Transformation: | |
871 | // t = 1/(x^2 + y^2) | |
872 | // u = 2 * x * t | |
873 | // v = 2 * x * tan(phiT) * t | |
874 | // Parameters in the equation: | |
875 | // a = -1/y0, b = x0/y0, e = dz/dx | |
876 | // | |
877 | // The Curvature is calculated by the following equation: | |
878 | // - curv = a/Sqrt(b^2 + 1) = 1/R | |
879 | // Parameters: - the 6 tracklets | |
880 | // - the Vertex constraint | |
881 | // Output: - the Chi2 value of the track | |
882 | // | |
883 | // debug level 5 | |
884 | // | |
885 | ||
886 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); | |
887 | fitter->StoreData(kTRUE); | |
888 | fitter->ClearPoints(); | |
889 | AliTRDcluster *cl = 0x0; | |
890 | ||
891 | Float_t x, y, z, w, t, error, tilt; | |
892 | Double_t uvt[2]; | |
893 | Int_t nPoints = 0; | |
053767a4 | 894 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
895 | if(!tracklets[ilr].IsOK()) continue; | |
f29f13a6 | 896 | for(Int_t itb = 0; itb < AliTRDseedV1::kNTimeBins; itb++){ |
053767a4 | 897 | if(!tracklets[ilr].IsUsable(itb)) continue; |
898 | cl = tracklets[ilr].GetClusters(itb); | |
41702fec | 899 | x = cl->GetX(); |
900 | y = cl->GetY(); | |
901 | z = cl->GetZ(); | |
053767a4 | 902 | tilt = tracklets[ilr].GetTilt(); |
41702fec | 903 | // Transformation |
904 | t = 1./(x * x + y * y); | |
905 | uvt[0] = 2. * x * t; | |
906 | uvt[1] = 2. * x * t * tilt ; | |
907 | w = 2. * (y + tilt * (z - zVertex)) * t; | |
f29f13a6 | 908 | error = 2. * TMath::Sqrt(cl->GetSigmaY2()) * t; |
41702fec | 909 | fitter->AddPoint(uvt, w, error); |
910 | nPoints++; | |
911 | } | |
912 | } | |
913 | fitter->Eval(); | |
914 | ||
915 | // Calculate curvature | |
916 | Double_t a = fitter->GetParameter(0); | |
917 | Double_t b = fitter->GetParameter(1); | |
918 | Double_t curvature = a/TMath::Sqrt(b*b + 1); | |
919 | ||
920 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
921 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) | |
e3cf3d02 | 922 | tracklets[ip].SetC(curvature); |
41702fec | 923 | |
3a039a31 | 924 | /* if(fReconstructor->GetStreamLevel() >= 5){ |
41702fec | 925 | //Linear Model on z-direction |
926 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack | |
927 | Double_t slope = fitter->GetParameter(2); | |
928 | Double_t zref = slope * xref; | |
929 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); | |
930 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
931 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
29f95561 | 932 | TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 933 | treeStreamer << "FitTiltedRiemanConstraint" |
934 | << "EventNumber=" << eventNumber | |
935 | << "CandidateNumber=" << candidateNumber | |
936 | << "Curvature=" << curvature | |
937 | << "Chi2Track=" << chi2track | |
938 | << "Chi2Z=" << chi2Z | |
939 | << "zref=" << zref | |
940 | << "\n"; | |
3a039a31 | 941 | }*/ |
41702fec | 942 | return chi2track; |
eb38ed55 | 943 | } |
944 | ||
945 | //_________________________________________________________________________ | |
946 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) | |
947 | { | |
41702fec | 948 | // |
949 | // Performs a Riemann fit taking tilting pad correction into account | |
950 | // The equation of a Riemann circle, where the y position is substituted by the | |
951 | // measured y-position taking pad tilting into account, has to be transformed | |
952 | // into a 4-dimensional hyperplane equation | |
953 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 | |
954 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) | |
955 | // zc: center of the pad row | |
956 | // zt: z-position of the track | |
957 | // The z-position of the track is assumed to be linear dependent on the x-position | |
958 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 | |
959 | // Transformation: u = 2 * x * t | |
960 | // v = 2 * tan(phiT) * t | |
961 | // w = 2 * tan(phiT) * (x - xref) * t | |
962 | // t = 1 / (x^2 + ymeas^2) | |
963 | // Parameters: a = -1/y0 | |
964 | // b = x0/y0 | |
965 | // c = (R^2 -x0^2 - y0^2)/y0 | |
966 | // d = offset | |
967 | // e = dz/dx | |
968 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using | |
969 | // results from the simple riemann fit. Afterwards the fit is redone. | |
970 | // The curvature is calculated according to the formula: | |
971 | // curv = a/(1 + b^2 + c*a) = 1/R | |
972 | // | |
973 | // Paramters: - Array of tracklets (connected to the track candidate) | |
974 | // - Flag selecting the error definition | |
975 | // Output: - Chi2 values of the track (in Parameter list) | |
976 | // | |
977 | TLinearFitter *fitter = GetTiltedRiemanFitter(); | |
978 | fitter->StoreData(kTRUE); | |
979 | fitter->ClearPoints(); | |
980 | AliTRDLeastSquare zfitter; | |
981 | AliTRDcluster *cl = 0x0; | |
982 | ||
983 | Double_t xref = CalculateReferenceX(tracklets); | |
984 | Double_t x, y, z, t, tilt, dx, w, we; | |
985 | Double_t uvt[4]; | |
986 | Int_t nPoints = 0; | |
987 | // Containers for Least-square fitter | |
988 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
989 | if(!tracklets[ipl].IsOK()) continue; | |
f29f13a6 | 990 | for(Int_t itb = 0; itb < AliTRDseedV1::kNTimeBins; itb++){ |
41702fec | 991 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
992 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
993 | x = cl->GetX(); | |
994 | y = cl->GetY(); | |
995 | z = cl->GetZ(); | |
996 | tilt = tracklets[ipl].GetTilt(); | |
997 | dx = x - xref; | |
998 | // Transformation | |
999 | t = 1./(x*x + y*y); | |
1000 | uvt[0] = 2. * x * t; | |
1001 | uvt[1] = t; | |
1002 | uvt[2] = 2. * tilt * t; | |
1003 | uvt[3] = 2. * tilt * dx * t; | |
1004 | w = 2. * (y + tilt*z) * t; | |
1005 | // error definition changes for the different calls | |
1006 | we = 2. * t; | |
f29f13a6 | 1007 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec | 1008 | fitter->AddPoint(uvt, w, we); |
1009 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1010 | nPoints++; | |
1011 | } | |
1012 | } | |
1013 | fitter->Eval(); | |
1014 | zfitter.Eval(); | |
1015 | ||
1016 | Double_t offset = fitter->GetParameter(3); | |
1017 | Double_t slope = fitter->GetParameter(4); | |
1018 | ||
1019 | // Linear fitter - not possible to make boundaries | |
1020 | // Do not accept non possible z and dzdx combinations | |
1021 | Bool_t acceptablez = kTRUE; | |
1022 | Double_t zref = 0.0; | |
1023 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1024 | if(!tracklets[iLayer].IsOK()) continue; | |
1025 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1026 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
41702fec | 1027 | acceptablez = kFALSE; |
1028 | } | |
1029 | if (!acceptablez) { | |
1030 | Double_t dzmf = zfitter.GetFunctionParameter(1); | |
1031 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1032 | fgTiltedRieman->FixParameter(3, zmf); | |
1033 | fgTiltedRieman->FixParameter(4, dzmf); | |
1034 | fitter->Eval(); | |
1035 | fitter->ReleaseParameter(3); | |
1036 | fitter->ReleaseParameter(4); | |
1037 | offset = fitter->GetParameter(3); | |
1038 | slope = fitter->GetParameter(4); | |
1039 | } | |
1040 | ||
1041 | // Calculate Curvarture | |
1042 | Double_t a = fitter->GetParameter(0); | |
1043 | Double_t b = fitter->GetParameter(1); | |
1044 | Double_t c = fitter->GetParameter(2); | |
1045 | Double_t curvature = 1.0 + b*b - c*a; | |
1046 | if (curvature > 0.0) | |
1047 | curvature = a / TMath::Sqrt(curvature); | |
1048 | ||
1049 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1050 | ||
1051 | // Update the tracklets | |
1052 | Double_t dy, dz; | |
1053 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { | |
1054 | ||
1055 | x = tracklets[iLayer].GetX0(); | |
1056 | y = 0; | |
1057 | z = 0; | |
1058 | dy = 0; | |
1059 | dz = 0; | |
1060 | ||
1061 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
1062 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1063 | // R = Sqrt() = 1/Curvature | |
1064 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
1065 | Double_t res = (x * a + b); // = (x - x0)/y0 | |
1066 | res *= res; | |
1067 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 | |
1068 | if (res >= 0) { | |
1069 | res = TMath::Sqrt(res); | |
1070 | y = (1.0 - res) / a; | |
1071 | } | |
1072 | ||
1073 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
1074 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
1075 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1076 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
1077 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
1078 | Double_t x0 = -b / a; | |
1079 | if (-c * a + b * b + 1 > 0) { | |
1080 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
1081 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); | |
1082 | if (a < 0) yderiv *= -1.0; | |
1083 | dy = yderiv; | |
1084 | } | |
1085 | } | |
1086 | z = offset + slope * (x - xref); | |
1087 | dz = slope; | |
1088 | tracklets[iLayer].SetYref(0, y); | |
1089 | tracklets[iLayer].SetYref(1, dy); | |
1090 | tracklets[iLayer].SetZref(0, z); | |
1091 | tracklets[iLayer].SetZref(1, dz); | |
1092 | tracklets[iLayer].SetC(curvature); | |
1093 | tracklets[iLayer].SetChi2(chi2track); | |
1094 | } | |
1095 | ||
3a039a31 | 1096 | /* if(fReconstructor->GetStreamLevel() >=5){ |
29f95561 | 1097 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 1098 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1099 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
1100 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); | |
1101 | cstreamer << "FitTiltedRieman0" | |
1102 | << "EventNumber=" << eventNumber | |
1103 | << "CandidateNumber=" << candidateNumber | |
1104 | << "xref=" << xref | |
1105 | << "Chi2Z=" << chi2z | |
1106 | << "\n"; | |
3a039a31 | 1107 | }*/ |
41702fec | 1108 | return chi2track; |
eb38ed55 | 1109 | } |
1110 | ||
3b57a3f7 | 1111 | |
9e333711 | 1112 | //____________________________________________________________________ |
6e4d4425 | 1113 | Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
9e333711 | 1114 | { |
1115 | AliTRDLeastSquare yfitter, zfitter; | |
1116 | AliTRDcluster *cl = 0x0; | |
1117 | ||
1118 | AliTRDseedV1 work[kNPlanes], *tracklet = 0x0; | |
1119 | if(!tracklets){ | |
1120 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1121 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1122 | if(!tracklet->IsOK()) continue; | |
1123 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1124 | } | |
1125 | tracklets = &work[0]; | |
1126 | } | |
1127 | ||
1128 | Double_t xref = CalculateReferenceX(tracklets); | |
1129 | Double_t x, y, z, dx, ye, yr, tilt; | |
1130 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1131 | if(!tracklets[ipl].IsOK()) continue; | |
1132 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1133 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1134 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1135 | x = cl->GetX(); | |
1136 | z = cl->GetZ(); | |
1137 | dx = x - xref; | |
1138 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1139 | } | |
1140 | } | |
1141 | zfitter.Eval(); | |
1142 | Double_t z0 = zfitter.GetFunctionParameter(0); | |
1143 | Double_t dzdx = zfitter.GetFunctionParameter(1); | |
1144 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1145 | if(!tracklets[ipl].IsOK()) continue; | |
1146 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1147 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1148 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1149 | x = cl->GetX(); | |
1150 | y = cl->GetY(); | |
1151 | z = cl->GetZ(); | |
1152 | tilt = tracklets[ipl].GetTilt(); | |
1153 | dx = x - xref; | |
1154 | yr = y + tilt*(z - z0 - dzdx*dx); | |
1155 | // error definition changes for the different calls | |
1156 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); | |
1157 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; | |
1158 | yfitter.AddPoint(&dx, yr, ye); | |
1159 | } | |
1160 | } | |
1161 | yfitter.Eval(); | |
1162 | Double_t y0 = yfitter.GetFunctionParameter(0); | |
1163 | Double_t dydx = yfitter.GetFunctionParameter(1); | |
1164 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); | |
1165 | ||
1166 | //update track points array | |
1167 | if(np && points){ | |
1168 | Float_t xyz[3]; | |
1169 | for(int ip=0; ip<np; ip++){ | |
1170 | points[ip].GetXYZ(xyz); | |
1171 | xyz[1] = y0 + dydx * (xyz[0] - xref); | |
1172 | xyz[2] = z0 + dzdx * (xyz[0] - xref); | |
1173 | points[ip].SetXYZ(xyz); | |
1174 | } | |
1175 | } | |
1176 | return chi2; | |
1177 | } | |
1178 | ||
1179 | ||
3b57a3f7 | 1180 | //_________________________________________________________________________ |
6e4d4425 | 1181 | Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
3b57a3f7 | 1182 | { |
41702fec | 1183 | // |
1184 | // Performs a Riemann fit taking tilting pad correction into account | |
1185 | // The equation of a Riemann circle, where the y position is substituted by the | |
1186 | // measured y-position taking pad tilting into account, has to be transformed | |
1187 | // into a 4-dimensional hyperplane equation | |
1188 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 | |
1189 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) | |
1190 | // zc: center of the pad row | |
1191 | // zt: z-position of the track | |
1192 | // The z-position of the track is assumed to be linear dependent on the x-position | |
1193 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 | |
1194 | // Transformation: u = 2 * x * t | |
1195 | // v = 2 * tan(phiT) * t | |
1196 | // w = 2 * tan(phiT) * (x - xref) * t | |
1197 | // t = 1 / (x^2 + ymeas^2) | |
1198 | // Parameters: a = -1/y0 | |
1199 | // b = x0/y0 | |
1200 | // c = (R^2 -x0^2 - y0^2)/y0 | |
1201 | // d = offset | |
1202 | // e = dz/dx | |
1203 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using | |
1204 | // results from the simple riemann fit. Afterwards the fit is redone. | |
1205 | // The curvature is calculated according to the formula: | |
1206 | // curv = a/(1 + b^2 + c*a) = 1/R | |
1207 | // | |
1208 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1209 | // - Flag selecting the error definition | |
1210 | // Output: - Chi2 values of the track (in Parameter list) | |
1211 | // | |
1212 | TLinearFitter *fitter = GetTiltedRiemanFitter(); | |
1213 | fitter->StoreData(kTRUE); | |
1214 | fitter->ClearPoints(); | |
1215 | AliTRDLeastSquare zfitter; | |
1216 | AliTRDcluster *cl = 0x0; | |
3b57a3f7 | 1217 | |
1218 | AliTRDseedV1 work[kNPlanes], *tracklet = 0x0; | |
1219 | if(!tracklets){ | |
1220 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1221 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1222 | if(!tracklet->IsOK()) continue; | |
1223 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1224 | } | |
1225 | tracklets = &work[0]; | |
1226 | } | |
1227 | ||
41702fec | 1228 | Double_t xref = CalculateReferenceX(tracklets); |
1229 | Double_t x, y, z, t, tilt, dx, w, we; | |
1230 | Double_t uvt[4]; | |
1231 | Int_t nPoints = 0; | |
1232 | // Containers for Least-square fitter | |
1233 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1234 | if(!tracklets[ipl].IsOK()) continue; | |
f29f13a6 | 1235 | for(Int_t itb = 0; itb < AliTRDseedV1::kNTimeBins; itb++){ |
41702fec | 1236 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1237 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1238 | x = cl->GetX(); | |
1239 | y = cl->GetY(); | |
1240 | z = cl->GetZ(); | |
1241 | tilt = tracklets[ipl].GetTilt(); | |
1242 | dx = x - xref; | |
1243 | // Transformation | |
1244 | t = 1./(x*x + y*y); | |
1245 | uvt[0] = 2. * x * t; | |
1246 | uvt[1] = t; | |
1247 | uvt[2] = 2. * tilt * t; | |
1248 | uvt[3] = 2. * tilt * dx * t; | |
1249 | w = 2. * (y + tilt*z) * t; | |
1250 | // error definition changes for the different calls | |
1251 | we = 2. * t; | |
f29f13a6 | 1252 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec | 1253 | fitter->AddPoint(uvt, w, we); |
1254 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1255 | nPoints++; | |
1256 | } | |
1257 | } | |
aec26713 | 1258 | if(fitter->Eval()) return 1.E10; |
1259 | ||
41702fec | 1260 | Double_t z0 = fitter->GetParameter(3); |
1261 | Double_t dzdx = fitter->GetParameter(4); | |
3b57a3f7 | 1262 | |
1263 | ||
1264 | // Linear fitter - not possible to make boundaries | |
1265 | // Do not accept non possible z and dzdx combinations | |
1266 | Bool_t accept = kTRUE; | |
1267 | Double_t zref = 0.0; | |
1268 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1269 | if(!tracklets[iLayer].IsOK()) continue; | |
1270 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1271 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
3b57a3f7 | 1272 | accept = kFALSE; |
1273 | } | |
1274 | if (!accept) { | |
41702fec | 1275 | zfitter.Eval(); |
3b57a3f7 | 1276 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1277 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1278 | fitter->FixParameter(3, zmf); | |
1279 | fitter->FixParameter(4, dzmf); | |
1280 | fitter->Eval(); | |
1281 | fitter->ReleaseParameter(3); | |
1282 | fitter->ReleaseParameter(4); | |
1283 | z0 = fitter->GetParameter(3); // = zmf ? | |
1284 | dzdx = fitter->GetParameter(4); // = dzmf ? | |
1285 | } | |
1286 | ||
1287 | // Calculate Curvature | |
1288 | Double_t a = fitter->GetParameter(0); | |
1289 | Double_t b = fitter->GetParameter(1); | |
1290 | Double_t c = fitter->GetParameter(2); | |
1291 | Double_t y0 = 1. / a; | |
1292 | Double_t x0 = -b * y0; | |
a015e406 | 1293 | Double_t tmp = y0*y0 + x0*x0 - c*y0; |
1294 | if(tmp<=0.) return 1.E10; | |
1295 | Double_t R = TMath::Sqrt(tmp); | |
3b57a3f7 | 1296 | Double_t C = 1.0 + b*b - c*a; |
1297 | if (C > 0.0) C = a / TMath::Sqrt(C); | |
1298 | ||
1299 | // Calculate chi2 of the fit | |
1300 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); | |
1301 | ||
1302 | // Update the tracklets | |
1303 | if(!track){ | |
1304 | for(Int_t ip = 0; ip < kNPlanes; ip++) { | |
1305 | x = tracklets[ip].GetX0(); | |
90cf7133 | 1306 | tmp = R*R-(x-x0)*(x-x0); |
a015e406 | 1307 | if(tmp <= 0.) continue; |
1308 | tmp = TMath::Sqrt(tmp); | |
3b57a3f7 | 1309 | |
1310 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
1311 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1312 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); | |
1313 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1314 | tracklets[ip].SetYref(1, (x - x0) / tmp); | |
1315 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); | |
1316 | tracklets[ip].SetZref(1, dzdx); | |
1317 | tracklets[ip].SetC(C); | |
1318 | tracklets[ip].SetChi2(chi2); | |
1319 | } | |
1320 | } | |
3b57a3f7 | 1321 | //update track points array |
1322 | if(np && points){ | |
1323 | Float_t xyz[3]; | |
1324 | for(int ip=0; ip<np; ip++){ | |
1325 | points[ip].GetXYZ(xyz); | |
60e55aee | 1326 | xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0))); |
3b57a3f7 | 1327 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1328 | points[ip].SetXYZ(xyz); | |
1329 | } | |
1330 | } | |
1331 | ||
3b57a3f7 | 1332 | return chi2; |
1333 | } | |
1334 | ||
1335 | ||
1bf51039 | 1336 | //____________________________________________________________________ |
1337 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points) | |
1338 | { | |
1339 | // Kalman filter implementation for the TRD. | |
1340 | // It returns the positions of the fit in the array "points" | |
1341 | // | |
1342 | // Author : A.Bercuci@gsi.de | |
1343 | ||
3cfaffa4 | 1344 | // printf("Start track @ x[%f]\n", track->GetX()); |
1bf51039 | 1345 | |
1346 | //prepare marker points along the track | |
1347 | Int_t ip = np ? 0 : 1; | |
1348 | while(ip<np){ | |
1349 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; | |
1350 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); | |
1351 | ip++; | |
1352 | } | |
1353 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); | |
1354 | ||
1355 | ||
1356 | AliTRDseedV1 tracklet, *ptrTracklet = 0x0; | |
1357 | ||
1358 | //Loop through the TRD planes | |
1359 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { | |
1360 | // GET TRACKLET OR BUILT IT | |
1361 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; | |
1362 | if(tracklets){ | |
1363 | if(!(ptrTracklet = &tracklets[iplane])) continue; | |
1364 | }else{ | |
1365 | if(!(ptrTracklet = track->GetTracklet(iplane))){ | |
1366 | /*AliTRDtrackerV1 *tracker = 0x0; | |
1367 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue; | |
1368 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); | |
1369 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ | |
1370 | continue; | |
1371 | } | |
1372 | } | |
1373 | if(!ptrTracklet->IsOK()) continue; | |
1374 | ||
1375 | Double_t x = ptrTracklet->GetX0(); | |
1376 | ||
1377 | while(ip < np){ | |
1378 | //don't do anything if next marker is after next update point. | |
1379 | if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break; | |
1bf51039 | 1380 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1381 | ||
1382 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1383 | track->GetXYZ(xyz); |
1384 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1385 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1386 | ip++; |
1387 | } | |
3cfaffa4 | 1388 | // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1bf51039 | 1389 | |
3cfaffa4 | 1390 | // Propagate closer to the next update point |
1bf51039 | 1391 | if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.; |
1392 | ||
1393 | if(!AdjustSector(track)) return -1; | |
1394 | if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1; | |
1395 | ||
1396 | //load tracklet to the tracker and the track | |
1397 | /* Int_t index; | |
1398 | if((index = FindTracklet(ptrTracklet)) < 0){ | |
1399 | ptrTracklet = SetTracklet(&tracklet); | |
1400 | index = fTracklets->GetEntriesFast()-1; | |
1401 | } | |
1402 | track->SetTracklet(ptrTracklet, index);*/ | |
1403 | ||
1404 | ||
1405 | // register tracklet to track with tracklet creation !! | |
1406 | // PropagateBack : loaded tracklet to the tracker and update index | |
1407 | // RefitInward : update index | |
1408 | // MakeTrack : loaded tracklet to the tracker and update index | |
1409 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); | |
1410 | ||
1411 | ||
1412 | //Calculate the mean material budget along the path inside the chamber | |
1413 | Double_t xyz0[3]; track->GetXYZ(xyz0); | |
1414 | Double_t alpha = track->GetAlpha(); | |
1415 | Double_t xyz1[3], y, z; | |
1416 | if(!track->GetProlongation(x, y, z)) return -1; | |
1417 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
1418 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
1419 | xyz1[2] = z; | |
3cfaffa4 | 1420 | if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position |
1bf51039 | 1421 | Double_t param[7]; |
3cfaffa4 | 1422 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break; |
1bf51039 | 1423 | Double_t xrho = param[0]*param[4]; // density*length |
1424 | Double_t xx0 = param[1]; // radiation length | |
1425 | ||
1426 | //Propagate the track | |
1427 | track->PropagateTo(x, xx0, xrho); | |
1428 | if (!AdjustSector(track)) break; | |
1429 | ||
1430 | //Update track | |
1431 | Double_t chi2 = track->GetPredictedChi2(ptrTracklet); | |
1432 | if(chi2<1e+10) track->Update(ptrTracklet, chi2); | |
1bf51039 | 1433 | if(!up) continue; |
1434 | ||
1435 | //Reset material budget if 2 consecutive gold | |
1436 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); | |
1437 | } // end planes loop | |
1438 | ||
1439 | // extrapolation | |
1440 | while(ip < np){ | |
1441 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; | |
1442 | ||
1443 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1444 | track->GetXYZ(xyz); |
1445 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1446 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1447 | ip++; |
1448 | } | |
1449 | ||
1450 | return track->GetChi2(); | |
1451 | } | |
3b57a3f7 | 1452 | |
eb38ed55 | 1453 | //_________________________________________________________________________ |
bb56afff | 1454 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 | 1455 | { |
41702fec | 1456 | // |
1457 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. | |
1458 | // A linear dependence on the x-value serves as a model. | |
1459 | // The parameters are related to the tilted Riemann fit. | |
1460 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
1461 | // - the offset for the reference x | |
1462 | // - the slope | |
1463 | // - the reference x position | |
1464 | // Output: - The Chi2 value of the track in z-Direction | |
1465 | // | |
1466 | Float_t chi2Z = 0, nLayers = 0; | |
053767a4 | 1467 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec | 1468 | if(!tracklets[iLayer].IsOK()) continue; |
1469 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1470 | chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z); |
41702fec | 1471 | nLayers++; |
1472 | } | |
1473 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); | |
1474 | return chi2Z; | |
eb38ed55 | 1475 | } |
1476 | ||
bccda319 | 1477 | //_____________________________________________________________________________ |
1478 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) | |
1479 | { | |
41702fec | 1480 | // |
1481 | // Starting from current X-position of track <t> this function | |
1482 | // extrapolates the track up to radial position <xToGo>. | |
1483 | // Returns 1 if track reaches the plane, and 0 otherwise | |
1484 | // | |
bccda319 | 1485 | |
41702fec | 1486 | const Double_t kEpsilon = 0.00001; |
bccda319 | 1487 | |
41702fec | 1488 | // Current track X-position |
1489 | Double_t xpos = t.GetX(); | |
bccda319 | 1490 | |
41702fec | 1491 | // Direction: inward or outward |
1492 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; | |
bccda319 | 1493 | |
41702fec | 1494 | while (((xToGo - xpos) * dir) > kEpsilon) { |
bccda319 | 1495 | |
41702fec | 1496 | Double_t xyz0[3]; |
1497 | Double_t xyz1[3]; | |
1498 | Double_t param[7]; | |
1499 | Double_t x; | |
1500 | Double_t y; | |
1501 | Double_t z; | |
bccda319 | 1502 | |
41702fec | 1503 | // The next step size |
1504 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); | |
bccda319 | 1505 | |
41702fec | 1506 | // Get the global position of the starting point |
1507 | t.GetXYZ(xyz0); | |
bccda319 | 1508 | |
41702fec | 1509 | // X-position after next step |
1510 | x = xpos + step; | |
bccda319 | 1511 | |
41702fec | 1512 | // Get local Y and Z at the X-position of the next step |
1513 | if (!t.GetProlongation(x,y,z)) { | |
1514 | return 0; // No prolongation possible | |
1515 | } | |
bccda319 | 1516 | |
41702fec | 1517 | // The global position of the end point of this prolongation step |
1518 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); | |
1519 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); | |
1520 | xyz1[2] = z; | |
bccda319 | 1521 | |
41702fec | 1522 | // Calculate the mean material budget between start and |
1523 | // end point of this prolongation step | |
83dea92e | 1524 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0; |
bccda319 | 1525 | |
41702fec | 1526 | // Propagate the track to the X-position after the next step |
9c87a076 | 1527 | if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0; |
bccda319 | 1528 | |
41702fec | 1529 | // Rotate the track if necessary |
1530 | AdjustSector(&t); | |
bccda319 | 1531 | |
41702fec | 1532 | // New track X-position |
1533 | xpos = t.GetX(); | |
bccda319 | 1534 | |
41702fec | 1535 | } |
bccda319 | 1536 | |
41702fec | 1537 | return 1; |
bccda319 | 1538 | |
1539 | } | |
1540 | ||
eb38ed55 | 1541 | |
1542 | //_____________________________________________________________________________ | |
1543 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const | |
1544 | { | |
41702fec | 1545 | // |
1546 | // Reads AliTRDclusters from the file. | |
1547 | // The names of the cluster tree and branches | |
1548 | // should match the ones used in AliTRDclusterizer::WriteClusters() | |
1549 | // | |
1550 | ||
1551 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); | |
1552 | TObjArray *clusterArray = new TObjArray(nsize+1000); | |
1553 | ||
1554 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); | |
1555 | if (!branch) { | |
1556 | AliError("Can't get the branch !"); | |
1557 | return 1; | |
1558 | } | |
1559 | branch->SetAddress(&clusterArray); | |
1560 | ||
1561 | if(!fClusters){ | |
8ae98148 | 1562 | Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters(); |
1563 | if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector; | |
1564 | array = new TClonesArray("AliTRDcluster", Int_t(nclusters)); | |
41702fec | 1565 | array->SetOwner(kTRUE); |
1566 | } | |
1567 | ||
1568 | // Loop through all entries in the tree | |
1569 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); | |
1570 | Int_t nbytes = 0; | |
1571 | Int_t ncl = 0; | |
1572 | AliTRDcluster *c = 0x0; | |
1573 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { | |
1574 | // Import the tree | |
1575 | nbytes += clusterTree->GetEvent(iEntry); | |
1576 | ||
1577 | // Get the number of points in the detector | |
1578 | Int_t nCluster = clusterArray->GetEntriesFast(); | |
1579 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { | |
1580 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; | |
1581 | c->SetInChamber(); | |
1582 | new((*fClusters)[ncl++]) AliTRDcluster(*c); | |
1583 | delete (clusterArray->RemoveAt(iCluster)); | |
1584 | } | |
1585 | ||
1586 | } | |
1587 | delete clusterArray; | |
1588 | ||
1589 | return 0; | |
eb38ed55 | 1590 | } |
1591 | ||
1592 | //_____________________________________________________________________________ | |
1593 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) | |
1594 | { | |
41702fec | 1595 | // |
66f6bfd9 | 1596 | // Fills clusters into TRD tracking sectors |
41702fec | 1597 | // |
41702fec | 1598 | |
48f8adf3 | 1599 | if(!fReconstructor->IsWritingClusters()){ |
1600 | fClusters = AliTRDReconstructor::GetClusters(); | |
1601 | } else { | |
66f6bfd9 | 1602 | if (ReadClusters(fClusters, cTree)) { |
1603 | AliError("Problem with reading the clusters !"); | |
1604 | return 1; | |
1605 | } | |
1606 | } | |
1607 | SetClustersOwner(); | |
1608 | ||
48f8adf3 | 1609 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 | 1610 | AliInfo("No TRD clusters"); |
41702fec | 1611 | return 1; |
1612 | } | |
66f6bfd9 | 1613 | |
1614 | //Int_t nin = | |
1615 | BuildTrackingContainers(); | |
1616 | ||
1617 | //Int_t ncl = fClusters->GetEntriesFast(); | |
1618 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
1619 | ||
1620 | return 0; | |
1621 | } | |
1622 | ||
1623 | //_____________________________________________________________________________ | |
1624 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters) | |
1625 | { | |
1626 | // | |
1627 | // Fills clusters into TRD tracking sectors | |
1628 | // Function for use in the HLT | |
1629 | ||
1630 | if(!clusters || !clusters->GetEntriesFast()){ | |
1631 | AliInfo("No TRD clusters"); | |
41702fec | 1632 | return 1; |
1633 | } | |
1634 | ||
66f6bfd9 | 1635 | fClusters = clusters; |
1636 | SetClustersOwner(); | |
1637 | ||
1638 | //Int_t nin = | |
1639 | BuildTrackingContainers(); | |
1640 | ||
1641 | //Int_t ncl = fClusters->GetEntriesFast(); | |
1642 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
1643 | ||
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | ||
1648 | //____________________________________________________________________ | |
1649 | Int_t AliTRDtrackerV1::BuildTrackingContainers() | |
1650 | { | |
1651 | // Building tracking containers for clusters | |
1652 | ||
1653 | Int_t nin =0, icl = fClusters->GetEntriesFast(); | |
41702fec | 1654 | while (icl--) { |
1655 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); | |
1656 | if(c->IsInChamber()) nin++; | |
1657 | Int_t detector = c->GetDetector(); | |
1658 | Int_t sector = fGeom->GetSector(detector); | |
053767a4 | 1659 | Int_t stack = fGeom->GetStack(detector); |
1660 | Int_t layer = fGeom->GetLayer(detector); | |
41702fec | 1661 | |
053767a4 | 1662 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl); |
41702fec | 1663 | } |
b0a48c4d | 1664 | |
1665 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); | |
053767a4 | 1666 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec | 1667 | if(!fTrSec[isector].GetNChambers()) continue; |
b0a48c4d | 1668 | fTrSec[isector].Init(fReconstructor, cal); |
41702fec | 1669 | } |
66f6bfd9 | 1670 | |
1671 | return nin; | |
eb38ed55 | 1672 | } |
1673 | ||
1674 | ||
66f6bfd9 | 1675 | |
0906e73e | 1676 | //____________________________________________________________________ |
1677 | void AliTRDtrackerV1::UnloadClusters() | |
1678 | { | |
41702fec | 1679 | // |
1680 | // Clears the arrays of clusters and tracks. Resets sectors and timebins | |
1681 | // | |
0906e73e | 1682 | |
41702fec | 1683 | if(fTracks) fTracks->Delete(); |
1684 | if(fTracklets) fTracklets->Delete(); | |
48f8adf3 | 1685 | if(fClusters){ |
1686 | if(IsClustersOwner()) fClusters->Delete(); | |
1687 | ||
1688 | // save clusters array in the reconstructor for further use. | |
1689 | if(!fReconstructor->IsWritingClusters()){ | |
1690 | AliTRDReconstructor::SetClusters(fClusters); | |
1691 | SetClustersOwner(kFALSE); | |
1692 | } else AliTRDReconstructor::SetClusters(0x0); | |
1693 | } | |
0906e73e | 1694 | |
053767a4 | 1695 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e | 1696 | |
41702fec | 1697 | // Increment the Event Number |
1698 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); | |
eb38ed55 | 1699 | } |
0906e73e | 1700 | |
fac58f00 | 1701 | // //____________________________________________________________________ |
1702 | // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const | |
1703 | // { | |
1704 | // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t); | |
1705 | // if(!track) return; | |
1706 | // | |
1707 | // AliTRDseedV1 *tracklet = 0x0; | |
1708 | // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){ | |
1709 | // if(!(tracklet = track->GetTracklet(ily))) continue; | |
1710 | // AliTRDcluster *c = 0x0; | |
1711 | // for(Int_t ic=AliTRDseed::knTimebins; ic--;){ | |
1712 | // if(!(c=tracklet->GetClusters(ic))) continue; | |
1713 | // c->Use(); | |
1714 | // } | |
1715 | // } | |
1716 | // } | |
1717 | // | |
b1957d3c | 1718 | |
eb38ed55 | 1719 | //_____________________________________________________________________________ |
1720 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track) | |
1721 | { | |
41702fec | 1722 | // |
1723 | // Rotates the track when necessary | |
1724 | // | |
1725 | ||
1726 | Double_t alpha = AliTRDgeometry::GetAlpha(); | |
1727 | Double_t y = track->GetY(); | |
1728 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); | |
3cfaffa4 | 1729 | |
41702fec | 1730 | if (y > ymax) { |
1731 | if (!track->Rotate( alpha)) { | |
1732 | return kFALSE; | |
1733 | } | |
1734 | } | |
1735 | else if (y < -ymax) { | |
1736 | if (!track->Rotate(-alpha)) { | |
1737 | return kFALSE; | |
1738 | } | |
1739 | } | |
1740 | ||
1741 | return kTRUE; | |
0906e73e | 1742 | |
1743 | } | |
1744 | ||
eb38ed55 | 1745 | |
0906e73e | 1746 | //____________________________________________________________________ |
1747 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx) | |
1748 | { | |
41702fec | 1749 | // Find tracklet for TRD track <track> |
1750 | // Parameters | |
1751 | // - track | |
1752 | // - sector | |
1753 | // - plane | |
1754 | // - index | |
1755 | // Output | |
1756 | // tracklet | |
1757 | // index | |
1758 | // Detailed description | |
1759 | // | |
1760 | idx = track->GetTrackletIndex(p); | |
1761 | AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); | |
1762 | ||
1763 | return tracklet; | |
0906e73e | 1764 | } |
1765 | ||
1766 | //____________________________________________________________________ | |
3b57a3f7 | 1767 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet) |
0906e73e | 1768 | { |
41702fec | 1769 | // Add this tracklet to the list of tracklets stored in the tracker |
1770 | // | |
1771 | // Parameters | |
1772 | // - tracklet : pointer to the tracklet to be added to the list | |
1773 | // | |
1774 | // Output | |
1775 | // - the index of the new tracklet in the tracker tracklets list | |
1776 | // | |
1777 | // Detailed description | |
1778 | // Build the tracklets list if it is not yet created (late initialization) | |
1779 | // and adds the new tracklet to the list. | |
1780 | // | |
1781 | if(!fTracklets){ | |
053767a4 | 1782 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec | 1783 | fTracklets->SetOwner(kTRUE); |
1784 | } | |
1785 | Int_t nentries = fTracklets->GetEntriesFast(); | |
1786 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); | |
972ef65e | 1787 | } |
1788 | ||
d20df6fc | 1789 | //____________________________________________________________________ |
1790 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track) | |
1791 | { | |
1792 | // Add this track to the list of tracks stored in the tracker | |
1793 | // | |
1794 | // Parameters | |
1795 | // - track : pointer to the track to be added to the list | |
1796 | // | |
1797 | // Output | |
1798 | // - the pointer added | |
1799 | // | |
1800 | // Detailed description | |
1801 | // Build the tracks list if it is not yet created (late initialization) | |
1802 | // and adds the new track to the list. | |
1803 | // | |
1804 | if(!fTracks){ | |
053767a4 | 1805 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc | 1806 | fTracks->SetOwner(kTRUE); |
1807 | } | |
1808 | Int_t nentries = fTracks->GetEntriesFast(); | |
1809 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); | |
1810 | } | |
1811 | ||
1812 | ||
0906e73e | 1813 | |
e4f2f73d | 1814 | //____________________________________________________________________ |
eb38ed55 | 1815 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d | 1816 | { |
41702fec | 1817 | // |
1818 | // Steer tracking for one SM. | |
1819 | // | |
1820 | // Parameters : | |
1821 | // sector : Array of (SM) propagation layers containing clusters | |
1822 | // esd : The current ESD event. On output it contains the also | |
1823 | // the ESD (TRD) tracks found in this SM. | |
1824 | // | |
1825 | // Output : | |
1826 | // Number of tracks found in this TRD supermodule. | |
1827 | // | |
1828 | // Detailed description | |
1829 | // | |
1830 | // 1. Unpack AliTRDpropagationLayers objects for each stack. | |
1831 | // 2. Launch stack tracking. | |
1832 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. | |
1833 | // 3. Pack results in the ESD event. | |
1834 | // | |
1835 | ||
1836 | // allocate space for esd tracks in this SM | |
1837 | TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack); | |
1838 | esdTrackList.SetOwner(); | |
1839 | ||
1840 | Int_t nTracks = 0; | |
1841 | Int_t nChambers = 0; | |
1842 | AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0; | |
053767a4 | 1843 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec | 1844 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
1845 | nChambers = 0; | |
053767a4 | 1846 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
1847 | if(!(chamber = stack[ilayer])) continue; | |
3a039a31 | 1848 | if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec | 1849 | nChambers++; |
053767a4 | 1850 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec | 1851 | } |
1852 | if(nChambers < 4) continue; | |
1853 | //AliInfo(Form("Doing stack %d", istack)); | |
1854 | nTracks += Clusters2TracksStack(stack, &esdTrackList); | |
1855 | } | |
1856 | //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks())); | |
1857 | ||
1858 | for(int itrack=0; itrack<nTracks; itrack++) | |
1859 | esd->AddTrack((AliESDtrack*)esdTrackList[itrack]); | |
1860 | ||
1861 | // Reset Track and Candidate Number | |
1862 | AliTRDtrackerDebug::SetCandidateNumber(0); | |
1863 | AliTRDtrackerDebug::SetTrackNumber(0); | |
1864 | return nTracks; | |
e4f2f73d | 1865 | } |
1866 | ||
1867 | //____________________________________________________________________ | |
eb38ed55 | 1868 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList) |
e4f2f73d | 1869 | { |
41702fec | 1870 | // |
1871 | // Make tracks in one TRD stack. | |
1872 | // | |
1873 | // Parameters : | |
1874 | // layer : Array of stack propagation layers containing clusters | |
1875 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. | |
1876 | // On exit the tracks found in this stack are appended. | |
1877 | // | |
1878 | // Output : | |
1879 | // Number of tracks found in this stack. | |
1880 | // | |
1881 | // Detailed description | |
1882 | // | |
1883 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. | |
1884 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. | |
1885 | // See AliTRDtrackerV1::MakeSeeds() for more details. | |
1886 | // 3. Arrange track candidates in decreasing order of their quality | |
1887 | // 4. Classify tracks in 5 categories according to: | |
1888 | // a) number of layers crossed | |
1889 | // b) track quality | |
1890 | // 5. Sign clusters by tracks in decreasing order of track quality | |
1891 | // 6. Build AliTRDtrack out of seeding tracklets | |
1892 | // 7. Cook MC label | |
1893 | // 8. Build ESD track and register it to the output list | |
1894 | // | |
1895 | ||
b0a48c4d | 1896 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
41702fec | 1897 | AliTRDtrackingChamber *chamber = 0x0; |
fac58f00 | 1898 | AliTRDtrackingChamber **ci = 0x0; |
41702fec | 1899 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
1900 | Int_t pars[4]; // MakeSeeds parameters | |
1901 | ||
1902 | //Double_t alpha = AliTRDgeometry::GetAlpha(); | |
1903 | //Double_t shift = .5 * alpha; | |
1904 | Int_t configs[kNConfigs]; | |
1905 | ||
fac58f00 | 1906 | // Purge used clusters from the containers |
1907 | ci = &stack[0]; | |
1908 | for(Int_t ic = kNPlanes; ic--; ci++){ | |
1909 | if(!(*ci)) continue; | |
1910 | (*ci)->Update(); | |
1911 | } | |
1912 | ||
41702fec | 1913 | // Build initial seeding configurations |
1914 | Double_t quality = BuildSeedingConfigs(stack, configs); | |
3a039a31 | 1915 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec | 1916 | AliInfo(Form("Plane config %d %d %d Quality %f" |
1917 | , configs[0], configs[1], configs[2], quality)); | |
1918 | } | |
d931f2aa | 1919 | |
41702fec | 1920 | |
1921 | // Initialize contors | |
1922 | Int_t ntracks, // number of TRD track candidates | |
1923 | ntracks1, // number of registered TRD tracks/iter | |
1924 | ntracks2 = 0; // number of all registered TRD tracks in stack | |
1925 | fSieveSeeding = 0; | |
d931f2aa | 1926 | |
1927 | // Get stack index | |
fac58f00 | 1928 | Int_t ic = 0; ci = &stack[0]; |
1929 | while(ic<kNPlanes && !(*ci)){ic++; ci++;} | |
1930 | if(!(*ci)) return ntracks2; | |
1931 | Int_t istack = fGeom->GetStack((*ci)->GetDetector()); | |
d931f2aa | 1932 | |
41702fec | 1933 | do{ |
1934 | // Loop over seeding configurations | |
1935 | ntracks = 0; ntracks1 = 0; | |
1936 | for (Int_t iconf = 0; iconf<3; iconf++) { | |
1937 | pars[0] = configs[iconf]; | |
1938 | pars[1] = ntracks; | |
d931f2aa | 1939 | pars[2] = istack; |
41702fec | 1940 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
1941 | if(ntracks == kMaxTracksStack) break; | |
1942 | } | |
3a039a31 | 1943 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec | 1944 | |
1945 | if(!ntracks) break; | |
1946 | ||
1947 | // Sort the seeds according to their quality | |
1948 | Int_t sort[kMaxTracksStack]; | |
1949 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); | |
1950 | ||
1951 | // Initialize number of tracks so far and logic switches | |
1952 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); | |
1953 | Bool_t signedTrack[kMaxTracksStack]; | |
1954 | Bool_t fakeTrack[kMaxTracksStack]; | |
1955 | for (Int_t i=0; i<ntracks; i++){ | |
1956 | signedTrack[i] = kFALSE; | |
1957 | fakeTrack[i] = kFALSE; | |
1958 | } | |
1959 | //AliInfo("Selecting track candidates ..."); | |
1960 | ||
1961 | // Sieve clusters in decreasing order of track quality | |
1962 | Double_t trackParams[7]; | |
1963 | // AliTRDseedV1 *lseed = 0x0; | |
1964 | Int_t jSieve = 0, candidates; | |
1965 | do{ | |
1966 | //AliInfo(Form("\t\tITER = %i ", jSieve)); | |
1967 | ||
1968 | // Check track candidates | |
1969 | candidates = 0; | |
1970 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { | |
804bb02e | 1971 | Int_t trackIndex = sort[itrack]; |
1972 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; | |
41702fec | 1973 | |
1974 | ||
804bb02e | 1975 | // Calculate track parameters from tracklets seeds |
804bb02e | 1976 | Int_t ncl = 0; |
1977 | Int_t nused = 0; | |
1978 | Int_t nlayers = 0; | |
1979 | Int_t findable = 0; | |
1980 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { | |
1981 | Int_t jseed = kNPlanes*trackIndex+jLayer; | |
1982 | if(!sseed[jseed].IsOK()) continue; | |
f29f13a6 | 1983 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++; |
804bb02e | 1984 | |
1985 | sseed[jseed].UpdateUsed(); | |
1986 | ncl += sseed[jseed].GetN2(); | |
1987 | nused += sseed[jseed].GetNUsed(); | |
1988 | nlayers++; | |
804bb02e | 1989 | } |
1990 | ||
f29f13a6 | 1991 | // Filter duplicated tracks |
1992 | if (nused > 30){ | |
1993 | //printf("Skip %d nused %d\n", trackIndex, nused); | |
1994 | fakeTrack[trackIndex] = kTRUE; | |
1995 | continue; | |
1996 | } | |
1997 | if (Float_t(nused)/ncl >= .25){ | |
1998 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); | |
1999 | fakeTrack[trackIndex] = kTRUE; | |
2000 | continue; | |
2001 | } | |
41702fec | 2002 | |
f29f13a6 | 2003 | // Classify tracks |
2004 | Bool_t skip = kFALSE; | |
2005 | switch(jSieve){ | |
2006 | case 0: | |
2007 | if(nlayers < 6) {skip = kTRUE; break;} | |
2008 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
2009 | break; | |
2010 | ||
2011 | case 1: | |
2012 | if(nlayers < findable){skip = kTRUE; break;} | |
2013 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} | |
2014 | break; | |
2015 | ||
2016 | case 2: | |
2017 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} | |
2018 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} | |
2019 | break; | |
2020 | ||
2021 | case 3: | |
2022 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
2023 | break; | |
2024 | ||
2025 | case 4: | |
2026 | if (nlayers == 3){skip = kTRUE; break;} | |
2027 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} | |
2028 | break; | |
2029 | } | |
2030 | if(skip){ | |
2031 | candidates++; | |
2032 | //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused); | |
2033 | continue; | |
2034 | } | |
2035 | signedTrack[trackIndex] = kTRUE; | |
2036 | ||
2037 | // Build track parameters | |
2038 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; | |
2039 | /* Int_t idx = 0; | |
2040 | while(idx<3 && !lseed->IsOK()) { | |
2041 | idx++; | |
2042 | lseed++; | |
2043 | }*/ | |
2044 | Double_t x = lseed->GetX0();// - 3.5; | |
2045 | trackParams[0] = x; //NEW AB | |
2046 | trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x); | |
2047 | trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x); | |
2048 | trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1))); | |
2049 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); | |
2050 | trackParams[5] = lseed->GetC(); | |
2051 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; | |
2052 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ | |
2053 | ||
2054 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ | |
2055 | AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); | |
2056 | ||
f29f13a6 | 2057 | AliTRDseedV1 *dseed[6]; |
fac58f00 | 2058 | memcpy(dseed, lseed, 6*sizeof(AliTRDseedV1*)); |
f29f13a6 | 2059 | |
2060 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); | |
2061 | //AliInfo(Form("Number of clusters %d.", nclusters)); | |
2062 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2063 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); | |
2064 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2065 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); | |
2066 | cstreamer << "Clusters2TracksStack" | |
2067 | << "EventNumber=" << eventNumber | |
2068 | << "TrackNumber=" << trackNumber | |
2069 | << "CandidateNumber=" << candidateNumber | |
2070 | << "Iter=" << fSieveSeeding | |
2071 | << "Like=" << fTrackQuality[trackIndex] | |
2072 | << "S0.=" << dseed[0] | |
2073 | << "S1.=" << dseed[1] | |
2074 | << "S2.=" << dseed[2] | |
2075 | << "S3.=" << dseed[3] | |
2076 | << "S4.=" << dseed[4] | |
2077 | << "S5.=" << dseed[5] | |
2078 | << "p0=" << trackParams[0] | |
2079 | << "p1=" << trackParams[1] | |
2080 | << "p2=" << trackParams[2] | |
2081 | << "p3=" << trackParams[3] | |
2082 | << "p4=" << trackParams[4] | |
2083 | << "p5=" << trackParams[5] | |
2084 | << "p6=" << trackParams[6] | |
f29f13a6 | 2085 | << "Ncl=" << ncl |
2086 | << "NLayers=" << nlayers | |
2087 | << "Findable=" << findable | |
2088 | << "NUsed=" << nused | |
2089 | << "\n"; | |
2090 | } | |
d877f55f | 2091 | |
f29f13a6 | 2092 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
2093 | if(!track){ | |
2094 | AliWarning("Fail to build a TRD Track."); | |
2095 | continue; | |
d877f55f | 2096 | } |
41702fec | 2097 | |
f29f13a6 | 2098 | //AliInfo("End of MakeTrack()"); |
2099 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); | |
2100 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); | |
2101 | esdTrack->SetLabel(track->GetLabel()); | |
2102 | track->UpdateESDtrack(esdTrack); | |
2103 | // write ESD-friends if neccessary | |
2104 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ | |
2105 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); | |
2106 | calibTrack->SetOwner(); | |
2107 | esdTrack->AddCalibObject(calibTrack); | |
2108 | } | |
2109 | ntracks1++; | |
2110 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); | |
41702fec | 2111 | } |
2112 | ||
2113 | jSieve++; | |
2114 | } while(jSieve<5 && candidates); // end track candidates sieve | |
2115 | if(!ntracks1) break; | |
2116 | ||
2117 | // increment counters | |
2118 | ntracks2 += ntracks1; | |
4302c900 | 2119 | |
2120 | if(fReconstructor->IsHLT()) break; | |
41702fec | 2121 | fSieveSeeding++; |
2122 | ||
2123 | // Rebuild plane configurations and indices taking only unused clusters into account | |
2124 | quality = BuildSeedingConfigs(stack, configs); | |
3a039a31 | 2125 | if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec | 2126 | |
2127 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
2128 | if(!(chamber = stack[ip])) continue; | |
b0a48c4d | 2129 | chamber->Build(fGeom, cal);//Indices(fSieveSeeding); |
41702fec | 2130 | } |
2131 | ||
3a039a31 | 2132 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec | 2133 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2134 | } | |
2135 | } while(fSieveSeeding<10); // end stack clusters sieve | |
2136 | ||
2137 | ||
2138 | ||
2139 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); | |
2140 | ||
2141 | return ntracks2; | |
e4f2f73d | 2142 | } |
2143 | ||
2144 | //___________________________________________________________________ | |
eb38ed55 | 2145 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d | 2146 | { |
41702fec | 2147 | // |
2148 | // Assign probabilities to chambers according to their | |
2149 | // capability of producing seeds. | |
2150 | // | |
2151 | // Parameters : | |
2152 | // | |
2153 | // layers : Array of stack propagation layers for all 6 chambers in one stack | |
2154 | // configs : On exit array of configuration indexes (see GetSeedingConfig() | |
2155 | // for details) in the decreasing order of their seeding probabilities. | |
2156 | // | |
2157 | // Output : | |
2158 | // | |
2159 | // Return top configuration quality | |
2160 | // | |
2161 | // Detailed description: | |
2162 | // | |
2163 | // To each chamber seeding configuration (see GetSeedingConfig() for | |
2164 | // the list of all configurations) one defines 2 quality factors: | |
2165 | // - an apriori topological quality (see GetSeedingConfig() for details) and | |
2166 | // - a data quality based on the uniformity of the distribution of | |
2167 | // clusters over the x range (time bins population). See CookChamberQA() for details. | |
2168 | // The overall chamber quality is given by the product of this 2 contributions. | |
2169 | // | |
2170 | ||
2171 | Double_t chamberQ[kNPlanes]; | |
2172 | AliTRDtrackingChamber *chamber = 0x0; | |
2173 | for(int iplane=0; iplane<kNPlanes; iplane++){ | |
2174 | if(!(chamber = stack[iplane])) continue; | |
2175 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; | |
2176 | } | |
2177 | ||
2178 | Double_t tconfig[kNConfigs]; | |
2179 | Int_t planes[4]; | |
2180 | for(int iconf=0; iconf<kNConfigs; iconf++){ | |
2181 | GetSeedingConfig(iconf, planes); | |
2182 | tconfig[iconf] = fgTopologicQA[iconf]; | |
2183 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; | |
2184 | } | |
2185 | ||
2186 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); | |
2187 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); | |
2188 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); | |
2189 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); | |
2190 | ||
2191 | return tconfig[configs[0]]; | |
e4f2f73d | 2192 | } |
2193 | ||
2194 | //____________________________________________________________________ | |
eb38ed55 | 2195 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar) |
e4f2f73d | 2196 | { |
41702fec | 2197 | // |
2198 | // Make tracklet seeds in the TRD stack. | |
2199 | // | |
2200 | // Parameters : | |
2201 | // layers : Array of stack propagation layers containing clusters | |
2202 | // sseed : Array of empty tracklet seeds. On exit they are filled. | |
2203 | // ipar : Control parameters: | |
2204 | // ipar[0] -> seeding chambers configuration | |
2205 | // ipar[1] -> stack index | |
2206 | // ipar[2] -> number of track candidates found so far | |
2207 | // | |
2208 | // Output : | |
2209 | // Number of tracks candidates found. | |
2210 | // | |
2211 | // Detailed description | |
2212 | // | |
2213 | // The following steps are performed: | |
2214 | // 1. Select seeding layers from seeding chambers | |
2215 | // 2. Select seeding clusters from the seeding AliTRDpropagationLayerStack. | |
2216 | // The clusters are taken from layer 3, layer 0, layer 1 and layer 2, in | |
2217 | // this order. The parameters controling the range of accepted clusters in | |
2218 | // layer 0, 1, and 2 are defined in AliTRDchamberTimeBin::BuildCond(). | |
2219 | // 3. Helix fit of the cluster set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)) | |
2220 | // 4. Initialize seeding tracklets in the seeding chambers. | |
2221 | // 5. Filter 0. | |
2222 | // Chi2 in the Y direction less than threshold ... (1./(3. - sLayer)) | |
2223 | // Chi2 in the Z direction less than threshold ... (1./(3. - sLayer)) | |
2224 | // 6. Attach clusters to seeding tracklets and find linear approximation of | |
2225 | // the tracklet (see AliTRDseedV1::AttachClustersIter()). The number of used | |
2226 | // clusters used by current seeds should not exceed ... (25). | |
2227 | // 7. Filter 1. | |
2228 | // All 4 seeding tracklets should be correctly constructed (see | |
2229 | // AliTRDseedV1::AttachClustersIter()) | |
2230 | // 8. Helix fit of the seeding tracklets | |
2231 | // 9. Filter 2. | |
2232 | // Likelihood calculation of the fit. (See AliTRDtrackerV1::CookLikelihood() for details) | |
2233 | // 10. Extrapolation of the helix fit to the other 2 chambers: | |
2234 | // a) Initialization of extrapolation tracklet with fit parameters | |
2235 | // b) Helix fit of tracklets | |
2236 | // c) Attach clusters and linear interpolation to extrapolated tracklets | |
2237 | // d) Helix fit of tracklets | |
2238 | // 11. Improve seeding tracklets quality by reassigning clusters. | |
2239 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. | |
2240 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation | |
2241 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. | |
2242 | // 14. Cooking labels for tracklets. Should be done only for MC | |
2243 | // 15. Register seeds. | |
2244 | // | |
2245 | ||
2246 | AliTRDtrackingChamber *chamber = 0x0; | |
be24510a | 2247 | AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters |
41702fec | 2248 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track |
2249 | Int_t ncl, mcl; // working variable for looping over clusters | |
2250 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; | |
2251 | // chi2 storage | |
2252 | // chi2[0] = tracklet chi2 on the Z direction | |
2253 | // chi2[1] = tracklet chi2 on the R direction | |
2254 | Double_t chi2[4]; | |
2255 | ||
e79f8eb0 | 2256 | // Default positions for the anode wire in all 6 Layers in case of a stack with missing clusters |
2257 | // Positions taken using cosmic data taken with SM3 after rebuild | |
d931f2aa | 2258 | Double_t x_def[kNPlanes] = {300.2, 312.8, 325.4, 338.0, 350.6, 363.2}; |
41702fec | 2259 | |
2260 | // this should be data member of AliTRDtrack | |
2261 | Double_t seedQuality[kMaxTracksStack]; | |
2262 | ||
2263 | // unpack control parameters | |
2264 | Int_t config = ipar[0]; | |
2265 | Int_t ntracks = ipar[1]; | |
d931f2aa | 2266 | Int_t istack = ipar[2]; |
41702fec | 2267 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
be24510a | 2268 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
2269 | ||
2270 | ||
41702fec | 2271 | // Init chambers geometry |
41702fec | 2272 | Double_t hL[kNPlanes]; // Tilting angle |
2273 | Float_t padlength[kNPlanes]; // pad lenghts | |
2274 | AliTRDpadPlane *pp = 0x0; | |
2275 | for(int iplane=0; iplane<kNPlanes; iplane++){ | |
2276 | pp = fGeom->GetPadPlane(iplane, istack); | |
bb79ccd5 | 2277 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec | 2278 | padlength[iplane] = pp->GetLengthIPad(); |
2279 | } | |
2280 | ||
3a039a31 | 2281 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec | 2282 | AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
2283 | } | |
2284 | ||
d931f2aa | 2285 | // Build seeding layers |
d611c74f | 2286 | ResetSeedTB(); |
41702fec | 2287 | Int_t nlayers = 0; |
41702fec | 2288 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2289 | if(!(chamber = stack[planes[isl]])) continue; | |
3a039a31 | 2290 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue; |
41702fec | 2291 | nlayers++; |
41702fec | 2292 | } |
1ba638fc | 2293 | if(nlayers < 4) return ntracks; |
41702fec | 2294 | |
2295 | ||
2296 | // Start finding seeds | |
2297 | Double_t cond0[4], cond1[4], cond2[4]; | |
2298 | Int_t icl = 0; | |
d611c74f | 2299 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec | 2300 | if(!c[3]) continue; |
d611c74f | 2301 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2302 | fSeedTB[0]->GetClusters(cond0, index, ncl); | |
41702fec | 2303 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2304 | Int_t jcl = 0; | |
2305 | while(jcl<ncl) { | |
d611c74f | 2306 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec | 2307 | if(!c[0]) continue; |
2308 | Double_t dx = c[3]->GetX() - c[0]->GetX(); | |
2309 | Double_t theta = (c[3]->GetZ() - c[0]->GetZ())/dx; | |
2310 | Double_t phi = (c[3]->GetY() - c[0]->GetY())/dx; | |
d611c74f | 2311 | fSeedTB[1]->BuildCond(c[0], cond1, 1, theta, phi); |
2312 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); | |
41702fec | 2313 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2314 | ||
2315 | Int_t kcl = 0; | |
2316 | while(kcl<mcl) { | |
d611c74f | 2317 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2318 | if(!c[1]) continue; | |
2319 | fSeedTB[2]->BuildCond(c[1], cond2, 2, theta, phi); | |
2320 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); | |
2321 | //printf("Found c[1] candidate 2 %p\n", c[2]); | |
2322 | if(!c[2]) continue; | |
2323 | ||
2324 | // AliInfo("Seeding clusters found. Building seeds ..."); | |
2325 | // 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()); | |
2326 | ||
804bb02e | 2327 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec | 2328 | |
d611c74f | 2329 | FitRieman(c, chi2); |
2330 | ||
d931f2aa | 2331 | AliTRDseedV1 *tseed = &cseed[0]; |
2332 | AliTRDtrackingChamber **cIter = &stack[0]; | |
2333 | for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){ | |
2334 | tseed->SetDetector((*cIter) ? (*cIter)->GetDetector() : -1); | |
43d6ad34 | 2335 | tseed->SetTilt(hL[iLayer]); |
2336 | tseed->SetPadLength(padlength[iLayer]); | |
3a039a31 | 2337 | tseed->SetReconstructor(fReconstructor); |
d931f2aa | 2338 | tseed->SetX0((*cIter) ? (*cIter)->GetX() : x_def[iLayer]); |
d611c74f | 2339 | tseed->Init(GetRiemanFitter()); |
f29f13a6 | 2340 | tseed->SetStandAlone(kTRUE); |
d611c74f | 2341 | } |
2342 | ||
2343 | Bool_t isFake = kFALSE; | |
3a039a31 | 2344 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
d611c74f | 2345 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2346 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2347 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2348 | ||
2349 | Double_t xpos[4]; | |
2350 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); | |
2351 | Float_t yref[4]; | |
2352 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); | |
2353 | Int_t ll = c[3]->GetLabel(0); | |
2354 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2355 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2356 | AliRieman *rim = GetRiemanFitter(); | |
29f95561 | 2357 | TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f | 2358 | cs0 << "MakeSeeds0" |
2359 | <<"EventNumber=" << eventNumber | |
2360 | <<"CandidateNumber=" << candidateNumber | |
2361 | <<"isFake=" << isFake | |
2362 | <<"config=" << config | |
2363 | <<"label=" << ll | |
2364 | <<"chi2z=" << chi2[0] | |
2365 | <<"chi2y=" << chi2[1] | |
2366 | <<"Y2exp=" << cond2[0] | |
2367 | <<"Z2exp=" << cond2[1] | |
2368 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() | |
2369 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() | |
2370 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() | |
2371 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() | |
2372 | <<"yref0=" << yref[0] | |
2373 | <<"yref1=" << yref[1] | |
2374 | <<"yref2=" << yref[2] | |
2375 | <<"yref3=" << yref[3] | |
2376 | <<"c0.=" << c[0] | |
2377 | <<"c1.=" << c[1] | |
2378 | <<"c2.=" << c[2] | |
2379 | <<"c3.=" << c[3] | |
2380 | <<"Seed0.=" << &cseed[planes[0]] | |
2381 | <<"Seed1.=" << &cseed[planes[1]] | |
2382 | <<"Seed2.=" << &cseed[planes[2]] | |
2383 | <<"Seed3.=" << &cseed[planes[3]] | |
2384 | <<"RiemanFitter.=" << rim | |
2385 | <<"\n"; | |
2386 | } | |
3a039a31 | 2387 | if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
91834b8d | 2388 | // //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0])); |
d611c74f | 2389 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2390 | continue; | |
2391 | } | |
3a039a31 | 2392 | if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
91834b8d | 2393 | // //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1])); |
d611c74f | 2394 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2395 | continue; | |
2396 | } | |
2397 | //AliInfo("Passed chi2 filter."); | |
2398 | ||
2399 | // try attaching clusters to tracklets | |
d611c74f | 2400 | Int_t mlayers = 0; |
be24510a | 2401 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f | 2402 | Int_t jLayer = planes[iLayer]; |
f29f13a6 | 2403 | if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue; |
2404 | cseed[jLayer].UpdateUsed(); | |
2405 | if(!cseed[jLayer].IsOK()) continue; | |
d611c74f | 2406 | mlayers++; |
2407 | } | |
be24510a | 2408 | |
2409 | if(mlayers < kNSeedPlanes){ | |
2410 | //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes)); | |
2411 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2412 | continue; | |
2413 | } | |
2414 | ||
2415 | // temporary exit door for the HLT | |
4302c900 | 2416 | if(fReconstructor->IsHLT()){ |
be24510a | 2417 | // attach clusters to extrapolation chambers |
2418 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ | |
2419 | Int_t jLayer = planesExt[iLayer]; | |
2420 | if(!(chamber = stack[jLayer])) continue; | |
f29f13a6 | 2421 | cseed[jLayer].AttachClusters(chamber, kTRUE); |
be24510a | 2422 | } |
4302c900 | 2423 | fTrackQuality[ntracks] = 1.; // dummy value |
2424 | ntracks++; | |
218ba867 | 2425 | if(ntracks == kMaxTracksStack) return ntracks; |
4302c900 | 2426 | cseed += 6; |
2427 | continue; | |
2428 | } | |
2429 | ||
be24510a | 2430 | |
f29f13a6 | 2431 | // Update Seeds and calculate Likelihood |
d611c74f | 2432 | // fit tracklets and cook likelihood |
f29f13a6 | 2433 | FitTiltedRieman(&cseed[0], kTRUE); |
2434 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ | |
2435 | Int_t jLayer = planes[iLayer]; | |
2436 | cseed[jLayer].Fit(kTRUE); | |
2437 | } | |
91834b8d | 2438 | Double_t like = CookLikelihood(&cseed[0], planes); // to be checked |
d611c74f | 2439 | |
3a039a31 | 2440 | if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){ |
d611c74f | 2441 | //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2442 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2443 | continue; | |
2444 | } | |
2445 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); | |
2446 | ||
2447 | // book preliminary results | |
2448 | seedQuality[ntracks] = like; | |
2449 | fSeedLayer[ntracks] = config;/*sLayer;*/ | |
2450 | ||
2451 | // attach clusters to the extrapolation seeds | |
be24510a | 2452 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2453 | Int_t jLayer = planesExt[iLayer]; | |
d611c74f | 2454 | if(!(chamber = stack[jLayer])) continue; |
d611c74f | 2455 | |
2456 | // fit extrapolated seed | |
2457 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; | |
2458 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; | |
2459 | AliTRDseedV1 pseed = cseed[jLayer]; | |
f29f13a6 | 2460 | if(!pseed.AttachClusters(chamber, kTRUE)) continue; |
2461 | pseed.Fit(kTRUE); | |
d611c74f | 2462 | cseed[jLayer] = pseed; |
d611c74f | 2463 | FitTiltedRieman(cseed, kTRUE); |
f29f13a6 | 2464 | cseed[jLayer].Fit(kTRUE); |
d611c74f | 2465 | } |
2466 | ||
2467 | // AliInfo("Extrapolation done."); | |
2468 | // Debug Stream containing all the 6 tracklets | |
3a039a31 | 2469 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
29f95561 | 2470 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f | 2471 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2472 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2473 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2474 | cstreamer << "MakeSeeds1" | |
2475 | << "EventNumber=" << eventNumber | |
2476 | << "CandidateNumber=" << candidateNumber | |
2477 | << "S0.=" << &cseed[0] | |
2478 | << "S1.=" << &cseed[1] | |
2479 | << "S2.=" << &cseed[2] | |
2480 | << "S3.=" << &cseed[3] | |
2481 | << "S4.=" << &cseed[4] | |
2482 | << "S5.=" << &cseed[5] | |
2483 | << "FitterT.=" << tiltedRieman | |
2484 | << "\n"; | |
2485 | } | |
2486 | ||
fb872574 | 2487 | if(fReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){ |
d611c74f | 2488 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2489 | continue; | |
2490 | } | |
2491 | //AliInfo("Improve seed quality done."); | |
2492 | ||
2493 | // fit full track and cook likelihoods | |
2494 | // Double_t curv = FitRieman(&cseed[0], chi2); | |
2495 | // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.); | |
2496 | // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.); | |
2497 | ||
2498 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) | |
2499 | Double_t chi2Vals[3]; | |
2500 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kFALSE); | |
91834b8d | 2501 | if(fReconstructor->GetRecoParam()->IsVertexConstrained()) |
d611c74f | 2502 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired |
2503 | else | |
2504 | chi2Vals[1] = 1.; | |
2505 | chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.); | |
2506 | // Chi2 definitions in testing stage | |
2507 | //chi2Vals[2] = GetChi2ZTest(&cseed[0]); | |
2508 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); | |
2509 | //AliInfo("Hyperplane fit done\n"); | |
fac58f00 | 2510 | |
3a039a31 | 2511 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
29f95561 | 2512 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f | 2513 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2514 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2515 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); | |
2516 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); | |
91834b8d | 2517 | Int_t ncls = 0; |
2518 | for(Int_t iseed = 0; iseed < kNPlanes; iseed++){ | |
2519 | ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0; | |
2520 | } | |
d611c74f | 2521 | cstreamer << "MakeSeeds2" |
2522 | << "EventNumber=" << eventNumber | |
2523 | << "CandidateNumber=" << candidateNumber | |
2524 | << "Chi2TR=" << chi2Vals[0] | |
2525 | << "Chi2TC=" << chi2Vals[1] | |
2526 | << "Nlayers=" << mlayers | |
91834b8d | 2527 | << "NClusters=" << ncls |
d611c74f | 2528 | << "Like=" << like |
2529 | << "S0.=" << &cseed[0] | |
2530 | << "S1.=" << &cseed[1] | |
2531 | << "S2.=" << &cseed[2] | |
2532 | << "S3.=" << &cseed[3] | |
2533 | << "S4.=" << &cseed[4] | |
2534 | << "S5.=" << &cseed[5] | |
d611c74f | 2535 | << "FitterT.=" << fitterT |
2536 | << "FitterTC.=" << fitterTC | |
2537 | << "\n"; | |
2538 | } | |
2539 | ||
2540 | ntracks++; | |
2541 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2542 | if(ntracks == kMaxTracksStack){ | |
2543 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); | |
2544 | return ntracks; | |
2545 | } | |
2546 | cseed += 6; | |
41702fec | 2547 | } |
2548 | } | |
2549 | } | |
41702fec | 2550 | |
2551 | return ntracks; | |
e4f2f73d | 2552 | } |
2553 | ||
2554 | //_____________________________________________________________________________ | |
0906e73e | 2555 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params) |
e4f2f73d | 2556 | { |
41702fec | 2557 | // |
2558 | // Build a TRD track out of tracklet candidates | |
2559 | // | |
2560 | // Parameters : | |
2561 | // seeds : array of tracklets | |
2562 | // params : track parameters (see MakeSeeds() function body for a detailed description) | |
2563 | // | |
2564 | // Output : | |
2565 | // The TRD track. | |
2566 | // | |
2567 | // Detailed description | |
2568 | // | |
2569 | // To be discussed with Marian !! | |
2570 | // | |
2571 | ||
41702fec | 2572 | |
2573 | Double_t alpha = AliTRDgeometry::GetAlpha(); | |
2574 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; | |
2575 | Double_t c[15]; | |
2576 | ||
2577 | c[ 0] = 0.2; | |
2578 | c[ 1] = 0.0; c[ 2] = 2.0; | |
2579 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; | |
2580 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; | |
2581 | c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; | |
2582 | ||
d20df6fc | 2583 | AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
2584 | track.PropagateTo(params[0]-5.0); | |
f29f13a6 | 2585 | AliTRDseedV1 *ptrTracklet = 0x0; |
2586 | // Sign clusters | |
2587 | for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) { | |
2588 | ptrTracklet = &seeds[jLayer]; | |
2589 | if(!ptrTracklet->IsOK()) continue; | |
2590 | if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian | |
2591 | } | |
2592 | // | |
91834b8d | 2593 | if(fReconstructor->IsHLT()){ |
91834b8d | 2594 | for(Int_t ip=0; ip<kNPlanes; ip++){ |
2595 | track.UnsetTracklet(ip); | |
2596 | ptrTracklet = SetTracklet(&seeds[ip]); | |
f29f13a6 | 2597 | ptrTracklet->UseClusters(); |
91834b8d | 2598 | track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
2599 | } | |
d78d7df0 | 2600 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
2601 | ptrTrack->SetReconstructor(fReconstructor); | |
2602 | return ptrTrack; | |
91834b8d | 2603 | } |
393fda1c | 2604 | |
d20df6fc | 2605 | track.ResetCovariance(1); |
e79f8eb0 | 2606 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
393fda1c | 2607 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){ |
2608 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2609 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2610 | Double_t p[5]; // Track Params for the Debug Stream | |
2611 | track.GetExternalParameters(params[0], p); | |
29f95561 | 2612 | TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
393fda1c | 2613 | cs << "MakeTrack" |
2614 | << "EventNumber=" << eventNumber | |
2615 | << "CandidateNumber=" << candidateNumber | |
2616 | << "nc=" << nc | |
2617 | << "X=" << params[0] | |
2618 | << "Y=" << p[0] | |
2619 | << "Z=" << p[1] | |
2620 | << "snp=" << p[2] | |
2621 | << "tnd=" << p[3] | |
2622 | << "crv=" << p[4] | |
2623 | << "Yin=" << params[1] | |
2624 | << "Zin=" << params[2] | |
2625 | << "snpin=" << params[3] | |
2626 | << "tndin=" << params[4] | |
2627 | << "crvin=" << params[5] | |
2628 | << "track.=" << &track | |
2629 | << "\n"; | |
2630 | } | |
d20df6fc | 2631 | if (nc < 30) return 0x0; |
2632 | ||
2633 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); | |
215f7116 | 2634 | ptrTrack->SetReconstructor(fReconstructor); |
48f8adf3 | 2635 | ptrTrack->CookLabel(.9); |
24253b0a | 2636 | |
d20df6fc | 2637 | // computes PID for track |
2638 | ptrTrack->CookPID(); | |
2639 | // update calibration references using this track | |
48f8adf3 | 2640 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
2641 | if (!calibra){ | |
2642 | AliInfo("Could not get Calibra instance\n"); | |
2643 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack); | |
2644 | } | |
d20df6fc | 2645 | return ptrTrack; |
e4f2f73d | 2646 | } |
2647 | ||
0906e73e | 2648 | |
e4f2f73d | 2649 | //____________________________________________________________________ |
eb38ed55 | 2650 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d | 2651 | { |
41702fec | 2652 | // |
2653 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst | |
2654 | // | |
2655 | // Parameters : | |
2656 | // layers : Array of propagation layers for a stack/supermodule | |
2657 | // cseed : Array of 6 seeding tracklets which has to be improved | |
2658 | // | |
f29f13a6 | 2659 | // Output : |
41702fec | 2660 | // cssed : Improved seeds |
2661 | // | |
2662 | // Detailed description | |
2663 | // | |
2664 | // Iterative procedure in which new clusters are searched for each | |
2665 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) | |
2666 | // can be maximized. If some optimization is found the old seeds are replaced. | |
2667 | // | |
2668 | // debug level: 7 | |
2669 | // | |
2670 | ||
2671 | // make a local working copy | |
2672 | AliTRDtrackingChamber *chamber = 0x0; | |
2673 | AliTRDseedV1 bseed[6]; | |
2674 | Int_t nLayers = 0; | |
2675 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer]; | |
2676 | ||
2677 | Float_t lastquality = 10000.0; | |
2678 | Float_t lastchi2 = 10000.0; | |
2679 | Float_t chi2 = 1000.0; | |
2680 | ||
2681 | for (Int_t iter = 0; iter < 4; iter++) { | |
2682 | Float_t sumquality = 0.0; | |
2683 | Float_t squality[6]; | |
2684 | Int_t sortindexes[6]; | |
2685 | ||
2686 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { | |
3a039a31 | 2687 | squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.; |
41702fec | 2688 | sumquality += squality[jLayer]; |
2689 | } | |
2690 | if ((sumquality >= lastquality) || (chi2 > lastchi2)) break; | |
2691 | ||
2692 | nLayers = 0; | |
2693 | lastquality = sumquality; | |
2694 | lastchi2 = chi2; | |
2695 | if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer]; | |
2696 | ||
2697 | TMath::Sort(6, squality, sortindexes, kFALSE); | |
2698 | for (Int_t jLayer = 5; jLayer > 1; jLayer--) { | |
2699 | Int_t bLayer = sortindexes[jLayer]; | |
2700 | if(!(chamber = stack[bLayer])) continue; | |
f29f13a6 | 2701 | bseed[bLayer].AttachClusters(chamber, kTRUE); |
2702 | bseed[bLayer].Fit(kTRUE); | |
41702fec | 2703 | if(bseed[bLayer].IsOK()) nLayers++; |
2704 | } | |
2705 | ||
2706 | chi2 = FitTiltedRieman(bseed, kTRUE); | |
3a039a31 | 2707 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){ |
41702fec | 2708 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2709 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2710 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); | |
29f95561 | 2711 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 2712 | cstreamer << "ImproveSeedQuality" |
2713 | << "EventNumber=" << eventNumber | |
2714 | << "CandidateNumber=" << candidateNumber | |
2715 | << "Iteration=" << iter | |
2716 | << "S0.=" << &bseed[0] | |
2717 | << "S1.=" << &bseed[1] | |
2718 | << "S2.=" << &bseed[2] | |
2719 | << "S3.=" << &bseed[3] | |
2720 | << "S4.=" << &bseed[4] | |
2721 | << "S5.=" << &bseed[5] | |
2722 | << "FitterT.=" << tiltedRieman | |
2723 | << "\n"; | |
2724 | } | |
2725 | } // Loop: iter | |
41702fec | 2726 | // we are sure that at least 2 tracklets are OK ! |
2727 | return nLayers+2; | |
e4f2f73d | 2728 | } |
2729 | ||
eb38ed55 | 2730 | //_________________________________________________________________________ |
2731 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){ | |
41702fec | 2732 | // |
2733 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for | |
2734 | // the track selection | |
2735 | // The likelihood value containes: | |
2736 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit | |
2737 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets | |
2738 | // For all Parameters an exponential dependency is used | |
2739 | // | |
2740 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
2741 | // - Array of chi2 values: | |
2742 | // * Non-Constrained Tilted Riemann fit | |
2743 | // * Vertex-Constrained Tilted Riemann fit | |
2744 | // * z-Direction from Linear fit | |
2745 | // Output: - The calculated track likelihood | |
2746 | // | |
2747 | // debug level 2 | |
2748 | // | |
2749 | ||
f29f13a6 | 2750 | Double_t chi2phi = 0, nLayers = 0; |
41702fec | 2751 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
2752 | if(!tracklets[iLayer].IsOK()) continue; | |
f29f13a6 | 2753 | chi2phi += tracklets[iLayer].GetChi2Phi(); |
41702fec | 2754 | nLayers++; |
2755 | } | |
f29f13a6 | 2756 | chi2phi /= Float_t (nLayers - 2.0); |
41702fec | 2757 | |
2758 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z | |
3a039a31 | 2759 | Double_t likeChi2TC = (fReconstructor->GetRecoParam() ->IsVertexConstrained()) ? |
d20df6fc | 2760 | TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann |
41702fec | 2761 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.78); // Non-constrained Tilted Riemann |
f29f13a6 | 2762 | Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23); |
2763 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi; | |
41702fec | 2764 | |
3a039a31 | 2765 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec | 2766 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2767 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
29f95561 | 2768 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 2769 | cstreamer << "CalculateTrackLikelihood0" |
2770 | << "EventNumber=" << eventNumber | |
2771 | << "CandidateNumber=" << candidateNumber | |
2772 | << "LikeChi2Z=" << likeChi2Z | |
2773 | << "LikeChi2TR=" << likeChi2TR | |
2774 | << "LikeChi2TC=" << likeChi2TC | |
f29f13a6 | 2775 | << "LikeChi2Phi=" << likeChi2Phi |
41702fec | 2776 | << "TrackLikelihood=" << trackLikelihood |
2777 | << "\n"; | |
2778 | } | |
2779 | ||
2780 | return trackLikelihood; | |
e4f2f73d | 2781 | } |
2782 | ||
2783 | //____________________________________________________________________ | |
91834b8d | 2784 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]) |
e4f2f73d | 2785 | { |
41702fec | 2786 | // |
2787 | // Calculate the probability of this track candidate. | |
2788 | // | |
2789 | // Parameters : | |
2790 | // cseeds : array of candidate tracklets | |
2791 | // planes : array of seeding planes (see seeding configuration) | |
2792 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. | |
2793 | // | |
2794 | // Output : | |
2795 | // likelihood value | |
2796 | // | |
2797 | // Detailed description | |
2798 | // | |
2799 | // The track quality is estimated based on the following 4 criteria: | |
2800 | // 1. precision of the rieman fit on the Y direction (likea) | |
2801 | // 2. chi2 on the Y direction (likechi2y) | |
2802 | // 3. chi2 on the Z direction (likechi2z) | |
2803 | // 4. number of attached clusters compared to a reference value | |
2804 | // (see AliTRDrecoParam::fkFindable) (likeN) | |
2805 | // | |
2806 | // The distributions for each type of probabilities are given below as of | |
2807 | // (date). They have to be checked to assure consistency of estimation. | |
2808 | // | |
2809 | ||
2810 | // ratio of the total number of clusters/track which are expected to be found by the tracker. | |
91834b8d | 2811 | const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam(); |
41702fec | 2812 | |
91834b8d | 2813 | Double_t chi2y = GetChi2Y(&cseed[0]); |
2814 | Double_t chi2z = GetChi2Z(&cseed[0]); | |
2815 | ||
8ae98148 | 2816 | Float_t nclusters = 0.; |
41702fec | 2817 | Double_t sumda = 0.; |
2818 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ | |
2819 | Int_t jlayer = planes[ilayer]; | |
2820 | nclusters += cseed[jlayer].GetN2(); | |
e3cf3d02 | 2821 | sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1)); |
41702fec | 2822 | } |
8ae98148 | 2823 | nclusters *= .25; |
2824 | ||
5a2e200c | 2825 | Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope()); |
41702fec | 2826 | Double_t likechi2y = 0.0000000001; |
5a2e200c | 2827 | if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope()); |
2828 | Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope()); | |
8ae98148 | 2829 | Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters()); |
41702fec | 2830 | Double_t like = likea * likechi2y * likechi2z * likeN; |
2831 | ||
2832 | // 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)); | |
3a039a31 | 2833 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec | 2834 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2835 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
91834b8d | 2836 | Int_t nTracklets = 0; Float_t mean_ncls = 0; |
2837 | for(Int_t iseed=0; iseed < kNPlanes; iseed++){ | |
2838 | if(!cseed[iseed].IsOK()) continue; | |
2839 | nTracklets++; | |
2840 | mean_ncls += cseed[iseed].GetN2(); | |
2841 | } | |
2842 | if(nTracklets) mean_ncls /= nTracklets; | |
41702fec | 2843 | // The Debug Stream contains the seed |
29f95561 | 2844 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 2845 | cstreamer << "CookLikelihood" |
2846 | << "EventNumber=" << eventNumber | |
2847 | << "CandidateNumber=" << candidateNumber | |
2848 | << "tracklet0.=" << &cseed[0] | |
2849 | << "tracklet1.=" << &cseed[1] | |
2850 | << "tracklet2.=" << &cseed[2] | |
2851 | << "tracklet3.=" << &cseed[3] | |
2852 | << "tracklet4.=" << &cseed[4] | |
2853 | << "tracklet5.=" << &cseed[5] | |
2854 | << "sumda=" << sumda | |
91834b8d | 2855 | << "chi2y=" << chi2y |
2856 | << "chi2z=" << chi2z | |
41702fec | 2857 | << "likea=" << likea |
2858 | << "likechi2y=" << likechi2y | |
2859 | << "likechi2z=" << likechi2z | |
2860 | << "nclusters=" << nclusters | |
2861 | << "likeN=" << likeN | |
2862 | << "like=" << like | |
91834b8d | 2863 | << "meanncls=" << mean_ncls |
41702fec | 2864 | << "\n"; |
2865 | } | |
2866 | ||
2867 | return like; | |
e4f2f73d | 2868 | } |
2869 | ||
e4f2f73d | 2870 | //____________________________________________________________________ |
0906e73e | 2871 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d | 2872 | { |
41702fec | 2873 | // |
2874 | // Map seeding configurations to detector planes. | |
2875 | // | |
2876 | // Parameters : | |
2877 | // iconfig : configuration index | |
2878 | // planes : member planes of this configuration. On input empty. | |
2879 | // | |
2880 | // Output : | |
2881 | // planes : contains the planes which are defining the configuration | |
2882 | // | |
2883 | // Detailed description | |
2884 | // | |
2885 | // Here is the list of seeding planes configurations together with | |
2886 | // their topological classification: | |
2887 | // | |
2888 | // 0 - 5432 TQ 0 | |
2889 | // 1 - 4321 TQ 0 | |
2890 | // 2 - 3210 TQ 0 | |
2891 | // 3 - 5321 TQ 1 | |
2892 | // 4 - 4210 TQ 1 | |
2893 | // 5 - 5431 TQ 1 | |
2894 | // 6 - 4320 TQ 1 | |
2895 | // 7 - 5430 TQ 2 | |
2896 | // 8 - 5210 TQ 2 | |
2897 | // 9 - 5421 TQ 3 | |
2898 | // 10 - 4310 TQ 3 | |
2899 | // 11 - 5410 TQ 4 | |
2900 | // 12 - 5420 TQ 5 | |
2901 | // 13 - 5320 TQ 5 | |
2902 | // 14 - 5310 TQ 5 | |
2903 | // | |
2904 | // The topologic quality is modeled as follows: | |
2905 | // 1. The general model is define by the equation: | |
2906 | // p(conf) = exp(-conf/2) | |
2907 | // 2. According to the topologic classification, configurations from the same | |
2908 | // class are assigned the agerage value over the model values. | |
2909 | // 3. Quality values are normalized. | |
2910 | // | |
2911 | // The topologic quality distribution as function of configuration is given below: | |
2912 | //Begin_Html | |
2913 | // <img src="gif/topologicQA.gif"> | |
2914 | //End_Html | |
2915 | // | |
2916 | ||
2917 | switch(iconfig){ | |
2918 | case 0: // 5432 TQ 0 | |
2919 | planes[0] = 2; | |
2920 | planes[1] = 3; | |
2921 | planes[2] = 4; | |
2922 | planes[3] = 5; | |
2923 | break; | |
2924 | case 1: // 4321 TQ 0 | |
2925 | planes[0] = 1; | |
2926 | planes[1] = 2; | |
2927 | planes[2] = 3; | |
2928 | planes[3] = 4; | |
2929 | break; | |
2930 | case 2: // 3210 TQ 0 | |
2931 | planes[0] = 0; | |
2932 | planes[1] = 1; | |
2933 | planes[2] = 2; | |
2934 | planes[3] = 3; | |
2935 | break; | |
2936 | case 3: // 5321 TQ 1 | |
2937 | planes[0] = 1; | |
2938 | planes[1] = 2; | |
2939 | planes[2] = 3; | |
2940 | planes[3] = 5; | |
2941 | break; | |
2942 | case 4: // 4210 TQ 1 | |
2943 | planes[0] = 0; | |
2944 | planes[1] = 1; | |
2945 | planes[2] = 2; | |
2946 | planes[3] = 4; | |
2947 | break; | |
2948 | case 5: // 5431 TQ 1 | |
2949 | planes[0] = 1; | |
2950 | planes[1] = 3; | |
2951 | planes[2] = 4; | |
2952 | planes[3] = 5; | |
2953 | break; | |
2954 | case 6: // 4320 TQ 1 | |
2955 | planes[0] = 0; | |
2956 | planes[1] = 2; | |
2957 | planes[2] = 3; | |
2958 | planes[3] = 4; | |
2959 | break; | |
2960 | case 7: // 5430 TQ 2 | |
2961 | planes[0] = 0; | |
2962 | planes[1] = 3; | |
2963 | planes[2] = 4; | |
2964 | planes[3] = 5; | |
2965 | break; | |
2966 | case 8: // 5210 TQ 2 | |
2967 | planes[0] = 0; | |
2968 | planes[1] = 1; | |
2969 | planes[2] = 2; | |
2970 | planes[3] = 5; | |
2971 | break; | |
2972 | case 9: // 5421 TQ 3 | |
2973 | planes[0] = 1; | |
2974 | planes[1] = 2; | |
2975 | planes[2] = 4; | |
2976 | planes[3] = 5; | |
2977 | break; | |
2978 | case 10: // 4310 TQ 3 | |
2979 | planes[0] = 0; | |
2980 | planes[1] = 1; | |
2981 | planes[2] = 3; | |
2982 | planes[3] = 4; | |
2983 | break; | |
2984 | case 11: // 5410 TQ 4 | |
2985 | planes[0] = 0; | |
2986 | planes[1] = 1; | |
2987 | planes[2] = 4; | |
2988 | planes[3] = 5; | |
2989 | break; | |
2990 | case 12: // 5420 TQ 5 | |
2991 | planes[0] = 0; | |
2992 | planes[1] = 2; | |
2993 | planes[2] = 4; | |
2994 | planes[3] = 5; | |
2995 | break; | |
2996 | case 13: // 5320 TQ 5 | |
2997 | planes[0] = 0; | |
2998 | planes[1] = 2; | |
2999 | planes[2] = 3; | |
3000 | planes[3] = 5; | |
3001 | break; | |
3002 | case 14: // 5310 TQ 5 | |
3003 | planes[0] = 0; | |
3004 | planes[1] = 1; | |
3005 | planes[2] = 3; | |
3006 | planes[3] = 5; | |
3007 | break; | |
3008 | } | |
e4f2f73d | 3009 | } |
3010 | ||
3011 | //____________________________________________________________________ | |
0906e73e | 3012 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d | 3013 | { |
41702fec | 3014 | // |
3015 | // Returns the extrapolation planes for a seeding configuration. | |
3016 | // | |
3017 | // Parameters : | |
3018 | // iconfig : configuration index | |
3019 | // planes : planes which are not in this configuration. On input empty. | |
3020 | // | |
3021 | // Output : | |
3022 | // planes : contains the planes which are not in the configuration | |
3023 | // | |
3024 | // Detailed description | |
3025 | // | |
3026 | ||
3027 | switch(iconfig){ | |
3028 | case 0: // 5432 TQ 0 | |
3029 | planes[0] = 1; | |
3030 | planes[1] = 0; | |
3031 | break; | |
3032 | case 1: // 4321 TQ 0 | |
3033 | planes[0] = 5; | |
3034 | planes[1] = 0; | |
3035 | break; | |
3036 | case 2: // 3210 TQ 0 | |
3037 | planes[0] = 4; | |
3038 | planes[1] = 5; | |
3039 | break; | |
3040 | case 3: // 5321 TQ 1 | |
3041 | planes[0] = 4; | |
3042 | planes[1] = 0; | |
3043 | break; | |
3044 | case 4: // 4210 TQ 1 | |
3045 | planes[0] = 5; | |
3046 | planes[1] = 3; | |
3047 | break; | |
3048 | case 5: // 5431 TQ 1 | |
3049 | planes[0] = 2; | |
3050 | planes[1] = 0; | |
3051 | break; | |
3052 | case 6: // 4320 TQ 1 | |
3053 | planes[0] = 5; | |
3054 | planes[1] = 1; | |
3055 | break; | |
3056 | case 7: // 5430 TQ 2 | |
3057 | planes[0] = 2; | |
3058 | planes[1] = 1; | |
3059 | break; | |
3060 | case 8: // 5210 TQ 2 | |
3061 | planes[0] = 4; | |
3062 | planes[1] = 3; | |
3063 | break; | |
3064 | case 9: // 5421 TQ 3 | |
3065 | planes[0] = 3; | |
3066 | planes[1] = 0; | |
3067 | break; | |
3068 | case 10: // 4310 TQ 3 | |
3069 | planes[0] = 5; | |
3070 | planes[1] = 2; | |
3071 | break; | |
3072 | case 11: // 5410 TQ 4 | |
3073 | planes[0] = 3; | |
3074 | planes[1] = 2; | |
3075 | break; | |
3076 | case 12: // 5420 TQ 5 | |
3077 | planes[0] = 3; | |
3078 | planes[1] = 1; | |
3079 | break; | |
3080 | case 13: // 5320 TQ 5 | |
3081 | planes[0] = 4; | |
3082 | planes[1] = 1; | |
3083 | break; | |
3084 | case 14: // 5310 TQ 5 | |
3085 | planes[0] = 4; | |
3086 | planes[1] = 2; | |
3087 | break; | |
3088 | } | |
e4f2f73d | 3089 | } |
eb38ed55 | 3090 | |
3091 | //____________________________________________________________________ | |
3092 | AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const | |
3093 | { | |
41702fec | 3094 | Int_t ncls = fClusters->GetEntriesFast(); |
2f7514a6 | 3095 | return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : 0x0; |
eb38ed55 | 3096 | } |
3097 | ||
3b57a3f7 | 3098 | //____________________________________________________________________ |
3099 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const | |
3100 | { | |
41702fec | 3101 | Int_t ntrklt = fTracklets->GetEntriesFast(); |
2f7514a6 | 3102 | return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : 0x0; |
3b57a3f7 | 3103 | } |
3104 | ||
3105 | //____________________________________________________________________ | |
3106 | AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const | |
3107 | { | |
41702fec | 3108 | Int_t ntrk = fTracks->GetEntriesFast(); |
2f7514a6 | 3109 | return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : 0x0; |
3b57a3f7 | 3110 | } |
3111 | ||
bb56afff | 3112 | //____________________________________________________________________ |
3113 | Float_t AliTRDtrackerV1::CalculateReferenceX(AliTRDseedV1 *tracklets){ | |
41702fec | 3114 | // |
3115 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
3116 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
3117 | // are taken into account | |
3118 | // | |
3119 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
3120 | // | |
3121 | // Output: - The reference x-position(Float_t) | |
3122 | // | |
3123 | Int_t nDistances = 0; | |
3124 | Float_t meanDistance = 0.; | |
3125 | Int_t startIndex = 5; | |
3126 | for(Int_t il =5; il > 0; il--){ | |
3127 | if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){ | |
3128 | Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0(); | |
3129 | meanDistance += xdiff; | |
3130 | nDistances++; | |
3131 | } | |
3132 | if(tracklets[il].IsOK()) startIndex = il; | |
3133 | } | |
3134 | if(tracklets[0].IsOK()) startIndex = 0; | |
3135 | if(!nDistances){ | |
3136 | // We should normally never get here | |
3137 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
3138 | Int_t iok = 0, idiff = 0; | |
3139 | // This attempt is worse and should be avoided: | |
3140 | // check for two chambers which are OK and repeat this without taking the mean value | |
3141 | // Strategy avoids a division by 0; | |
3142 | for(Int_t il = 5; il >= 0; il--){ | |
3143 | if(tracklets[il].IsOK()){ | |
3144 | xpos[iok] = tracklets[il].GetX0(); | |
3145 | iok++; | |
3146 | startIndex = il; | |
3147 | } | |
3148 | if(iok) idiff++; // to get the right difference; | |
3149 | if(iok > 1) break; | |
3150 | } | |
3151 | if(iok > 1){ | |
3152 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
3153 | } | |
3154 | else{ | |
3155 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
3156 | return 331.; | |
3157 | } | |
3158 | } | |
3159 | else{ | |
3160 | meanDistance /= nDistances; | |
3161 | } | |
3162 | return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
bb56afff | 3163 | } |
eb38ed55 | 3164 | |
fac58f00 | 3165 | // //_____________________________________________________________________________ |
3166 | // Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist | |
3167 | // , Int_t *outlist, Bool_t down) | |
3168 | // { | |
3169 | // // | |
3170 | // // Sort eleements according occurancy | |
3171 | // // The size of output array has is 2*n | |
3172 | // // | |
3173 | // | |
3174 | // if (n <= 0) { | |
3175 | // return 0; | |
3176 | // } | |
3177 | // | |
3178 | // Int_t *sindexS = new Int_t[n]; // Temporary array for sorting | |
3179 | // Int_t *sindexF = new Int_t[2*n]; | |
3180 | // for (Int_t i = 0; i < n; i++) { | |
3181 | // sindexF[i] = 0; | |
3182 | // } | |
3183 | // | |
3184 | // TMath::Sort(n,inlist,sindexS,down); | |
3185 | // | |
3186 | // Int_t last = inlist[sindexS[0]]; | |
3187 | // Int_t val = last; | |
3188 | // sindexF[0] = 1; | |
3189 | // sindexF[0+n] = last; | |
3190 | // Int_t countPos = 0; | |
3191 | // | |
3192 | // // Find frequency | |
3193 | // for (Int_t i = 1; i < n; i++) { | |
3194 | // val = inlist[sindexS[i]]; | |
3195 | // if (last == val) { | |
3196 | // sindexF[countPos]++; | |
3197 | // } | |
3198 | // else { | |
3199 | // countPos++; | |
3200 | // sindexF[countPos+n] = val; | |
3201 | // sindexF[countPos]++; | |
3202 | // last = val; | |
3203 | // } | |
3204 | // } | |
3205 | // if (last == val) { | |
3206 | // countPos++; | |
3207 | // } | |
3208 | // | |
3209 | // // Sort according frequency | |
3210 | // TMath::Sort(countPos,sindexF,sindexS,kTRUE); | |
3211 | // | |
3212 | // for (Int_t i = 0; i < countPos; i++) { | |
3213 | // outlist[2*i ] = sindexF[sindexS[i]+n]; | |
3214 | // outlist[2*i+1] = sindexF[sindexS[i]]; | |
3215 | // } | |
3216 | // | |
3217 | // delete [] sindexS; | |
3218 | // delete [] sindexF; | |
3219 | // | |
3220 | // return countPos; | |
3221 | // | |
3222 | // } | |
bb56afff | 3223 | |
06b32d95 | 3224 | |
d611c74f | 3225 | //____________________________________________________________________ |
3226 | void AliTRDtrackerV1::ResetSeedTB() | |
3227 | { | |
3228 | // reset buffer for seeding time bin layers. If the time bin | |
3229 | // layers are not allocated this function allocates them | |
3230 | ||
3231 | for(Int_t isl=0; isl<kNSeedPlanes; isl++){ | |
3232 | if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin(); | |
3233 | else fSeedTB[isl]->Clear(); | |
3234 | } | |
3235 | } | |
3236 | ||
e3cf3d02 | 3237 | |
3238 | //_____________________________________________________________________________ | |
3239 | Float_t AliTRDtrackerV1::GetChi2Y(AliTRDseedV1 *tracklets) const | |
3240 | { | |
3241 | // Calculates normalized chi2 in y-direction | |
3242 | // chi2 = Sum chi2 / n_tracklets | |
3243 | ||
3244 | Double_t chi2 = 0.; Int_t n = 0; | |
3245 | for(Int_t ipl = kNPlanes; ipl--;){ | |
3246 | if(!tracklets[ipl].IsOK()) continue; | |
3247 | chi2 += tracklets[ipl].GetChi2Y(); | |
3248 | n++; | |
3249 | } | |
3250 | return n ? chi2/n : 0.; | |
3251 | } | |
3252 | ||
bb56afff | 3253 | //_____________________________________________________________________________ |
3254 | Float_t AliTRDtrackerV1::GetChi2Z(AliTRDseedV1 *tracklets) const | |
3255 | { | |
91834b8d | 3256 | // Calculates normalized chi2 in z-direction |
e3cf3d02 | 3257 | // chi2 = Sum chi2 / n_tracklets |
41702fec | 3258 | |
e3cf3d02 | 3259 | Double_t chi2 = 0; Int_t n = 0; |
3260 | for(Int_t ipl = kNPlanes; ipl--;){ | |
41702fec | 3261 | if(!tracklets[ipl].IsOK()) continue; |
e3cf3d02 | 3262 | chi2 += tracklets[ipl].GetChi2Z(); |
3263 | n++; | |
41702fec | 3264 | } |
e3cf3d02 | 3265 | return n ? chi2/n : 0.; |
bb56afff | 3266 | } |
8acca6a3 | 3267 | |
3268 | /////////////////////////////////////////////////////// | |
3269 | // // | |
3270 | // Resources of class AliTRDLeastSquare // | |
3271 | // // | |
3272 | /////////////////////////////////////////////////////// | |
3273 | ||
3274 | //_____________________________________________________________________________ | |
3275 | AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){ | |
41702fec | 3276 | // |
3277 | // Constructor of the nested class AliTRDtrackFitterLeastSquare | |
3278 | // | |
3279 | memset(fParams, 0, sizeof(Double_t) * 2); | |
3280 | memset(fSums, 0, sizeof(Double_t) * 5); | |
3281 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); | |
8acca6a3 | 3282 | |
3283 | } | |
3284 | ||
3285 | //_____________________________________________________________________________ | |
3286 | void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(Double_t *x, Double_t y, Double_t sigmaY){ | |
41702fec | 3287 | // |
3288 | // Adding Point to the fitter | |
3289 | // | |
3290 | Double_t weight = 1/(sigmaY * sigmaY); | |
3291 | Double_t &xpt = *x; | |
3292 | // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY); | |
3293 | fSums[0] += weight; | |
3294 | fSums[1] += weight * xpt; | |
3295 | fSums[2] += weight * y; | |
3296 | fSums[3] += weight * xpt * y; | |
3297 | fSums[4] += weight * xpt * xpt; | |
3298 | fSums[5] += weight * y * y; | |
8acca6a3 | 3299 | } |
3300 | ||
3301 | //_____________________________________________________________________________ | |
3302 | void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(Double_t *x, Double_t y, Double_t sigmaY){ | |
41702fec | 3303 | // |
3304 | // Remove Point from the sample | |
3305 | // | |
3306 | Double_t weight = 1/(sigmaY * sigmaY); | |
3307 | Double_t &xpt = *x; | |
3308 | fSums[0] -= weight; | |
3309 | fSums[1] -= weight * xpt; | |
3310 | fSums[2] -= weight * y; | |
3311 | fSums[3] -= weight * xpt * y; | |
3312 | fSums[4] -= weight * xpt * xpt; | |
3313 | fSums[5] -= weight * y * y; | |
8acca6a3 | 3314 | } |
3315 | ||
3316 | //_____________________________________________________________________________ | |
3317 | void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){ | |
41702fec | 3318 | // |
3319 | // Evaluation of the fit: | |
3320 | // Calculation of the parameters | |
3321 | // Calculation of the covariance matrix | |
3322 | // | |
3323 | ||
3324 | Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1]; | |
aec26713 | 3325 | if(denominator==0) return; |
3326 | ||
41702fec | 3327 | // for(Int_t isum = 0; isum < 5; isum++) |
3328 | // printf("fSums[%d] = %f\n", isum, fSums[isum]); | |
3329 | // printf("denominator = %f\n", denominator); | |
3330 | fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator; | |
3331 | fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator; | |
3332 | // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]); | |
3333 | ||
3334 | // Covariance matrix | |
3335 | fCovarianceMatrix[0] = fSums[4] - fSums[1] * fSums[1] / fSums[0]; | |
3336 | fCovarianceMatrix[1] = fSums[5] - fSums[2] * fSums[2] / fSums[0]; | |
3337 | fCovarianceMatrix[2] = fSums[3] - fSums[1] * fSums[2] / fSums[0]; | |
8acca6a3 | 3338 | } |
3339 | ||
46b6abd7 | 3340 | //_____________________________________________________________________________ |
3341 | Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(Double_t *xpos) const { | |
41702fec | 3342 | // |
3343 | // Returns the Function value of the fitted function at a given x-position | |
3344 | // | |
3345 | return fParams[0] + fParams[1] * (*xpos); | |
46b6abd7 | 3346 | } |
3347 | ||
3348 | //_____________________________________________________________________________ | |
3349 | void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const { | |
41702fec | 3350 | // |
3351 | // Copies the values of the covariance matrix into the storage | |
3352 | // | |
3353 | memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3); | |
46b6abd7 | 3354 | } |
3355 |