]>
Commit | Line | Data |
---|---|---|
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 | ||
e4f2f73d | 28 | #include <TBranch.h> |
bb56afff | 29 | #include <TDirectory.h> |
e4f2f73d | 30 | #include <TLinearFitter.h> |
e4f2f73d | 31 | #include <TTree.h> |
32 | #include <TClonesArray.h> | |
e4f2f73d | 33 | #include <TTreeStream.h> |
eb2b4f91 | 34 | #include <TGeoMatrix.h> |
35 | #include <TGeoManager.h> | |
e4f2f73d | 36 | |
37 | #include "AliLog.h" | |
fac58f00 | 38 | #include "AliMathBase.h" |
e4f2f73d | 39 | #include "AliESDEvent.h" |
bb56afff | 40 | #include "AliGeomManager.h" |
e4f2f73d | 41 | #include "AliRieman.h" |
42 | #include "AliTrackPointArray.h" | |
43 | ||
e4f2f73d | 44 | #include "AliTRDgeometry.h" |
45 | #include "AliTRDpadPlane.h" | |
e4f2f73d | 46 | #include "AliTRDcalibDB.h" |
e4f2f73d | 47 | #include "AliTRDReconstructor.h" |
48 | #include "AliTRDCalibraFillHisto.h" | |
e4f2f73d | 49 | #include "AliTRDrecoParam.h" |
bb56afff | 50 | |
51 | #include "AliTRDcluster.h" | |
828c6f80 | 52 | #include "AliTRDdigitsParam.h" |
e4f2f73d | 53 | #include "AliTRDseedV1.h" |
0906e73e | 54 | #include "AliTRDtrackV1.h" |
bb56afff | 55 | #include "AliTRDtrackerV1.h" |
56 | #include "AliTRDtrackerDebug.h" | |
57 | #include "AliTRDtrackingChamber.h" | |
58 | #include "AliTRDchamberTimeBin.h" | |
59 | ||
e4f2f73d | 60 | ClassImp(AliTRDtrackerV1) |
903326c1 | 61 | ClassImp(AliTRDtrackerV1::AliTRDLeastSquare) |
62 | ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman) | |
eb38ed55 | 63 | |
eb38ed55 | 64 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // |
65 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // | |
66 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // | |
67 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle | |
68 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation | |
d76231c8 | 69 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
6e39bde4 | 70 | 0.5112, 0.5112, 0.5112, 0.0786, 0.0786, |
41702fec | 71 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, |
72 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 | |
e165b64b | 73 | }; |
74 | const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = { | |
75 | 300.2, 312.8, 325.4, 338.0, 350.6, 363.2}; | |
2985ffcb | 76 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
4d6aee34 | 77 | AliRieman* AliTRDtrackerV1::fgRieman = NULL; |
78 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL; | |
79 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL; | |
e4f2f73d | 80 | |
81 | //____________________________________________________________________ | |
3a039a31 | 82 | AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec) |
41702fec | 83 | :AliTracker() |
4d6aee34 | 84 | ,fkReconstructor(NULL) |
9e85cb05 | 85 | ,fkRecoParam(NULL) |
4d6aee34 | 86 | ,fGeom(NULL) |
87 | ,fClusters(NULL) | |
88 | ,fTracklets(NULL) | |
89 | ,fTracks(NULL) | |
b1135f96 | 90 | ,fTracksESD(NULL) |
41702fec | 91 | ,fSieveSeeding(0) |
e4f2f73d | 92 | { |
41702fec | 93 | // |
94 | // Default constructor. | |
95 | // | |
eb2b4f91 | 96 | |
97 | SetReconstructor(rec); // initialize reconstructor | |
98 | ||
99 | // initialize geometry | |
100 | if(!AliGeomManager::GetGeometry()){ | |
101 | AliFatal("Could not get geometry."); | |
102 | } | |
103 | fGeom = new AliTRDgeometry(); | |
104 | fGeom->CreateClusterMatrixArray(); | |
4d6aee34 | 105 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 106 | Double_t loc[] = {0., 0., 0.}; |
107 | Double_t glb[] = {0., 0., 0.}; | |
108 | for(Int_t ily=kNPlanes; ily--;){ | |
e165b64b | 109 | Int_t ism = 0; |
110 | while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++; | |
111 | if(!matrix){ | |
112 | AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily)); | |
113 | fR[ily] = fgkX0[ily]; | |
eb2b4f91 | 114 | continue; |
115 | } | |
116 | matrix->LocalToMaster(loc, glb); | |
117 | fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); | |
118 | } | |
119 | ||
eb2b4f91 | 120 | // initialize cluster containers |
053767a4 | 121 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
3a039a31 | 122 | |
eb2b4f91 | 123 | // initialize arrays |
124 | memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t)); | |
125 | memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t)); | |
126 | memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*)); | |
b1135f96 | 127 | fTracksESD = new TClonesArray("AliESDtrack", 2*kMaxTracksStack); |
128 | fTracksESD->SetOwner(); | |
eb38ed55 | 129 | } |
130 | ||
e4f2f73d | 131 | //____________________________________________________________________ |
132 | AliTRDtrackerV1::~AliTRDtrackerV1() | |
133 | { | |
41702fec | 134 | // |
135 | // Destructor | |
136 | // | |
137 | ||
4d6aee34 | 138 | if(fgRieman) delete fgRieman; fgRieman = NULL; |
139 | if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL; | |
140 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL; | |
d611c74f | 141 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl]; |
b1135f96 | 142 | if(fTracksESD){ fTracksESD->Delete(); delete fTracksESD; } |
41702fec | 143 | if(fTracks) {fTracks->Delete(); delete fTracks;} |
144 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} | |
48f8adf3 | 145 | if(fClusters) { |
146 | fClusters->Delete(); delete fClusters; | |
147 | } | |
41702fec | 148 | if(fGeom) delete fGeom; |
e4f2f73d | 149 | } |
150 | ||
151 | //____________________________________________________________________ | |
152 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) | |
153 | { | |
41702fec | 154 | // |
155 | // Steering stand alone tracking for full TRD detector | |
156 | // | |
157 | // Parameters : | |
158 | // esd : The ESD event. On output it contains | |
159 | // the ESD tracks found in TRD. | |
160 | // | |
161 | // Output : | |
162 | // Number of tracks found in the TRD detector. | |
163 | // | |
164 | // Detailed description | |
165 | // 1. Launch individual SM trackers. | |
166 | // See AliTRDtrackerV1::Clusters2TracksSM() for details. | |
167 | // | |
168 | ||
9e85cb05 | 169 | if(!fkRecoParam){ |
3a039a31 | 170 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); |
41702fec | 171 | return 0; |
172 | } | |
173 | ||
174 | //AliInfo("Start Track Finder ..."); | |
175 | Int_t ntracks = 0; | |
053767a4 | 176 | for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){ |
41702fec | 177 | // for(int ism=1; ism<2; ism++){ |
178 | //AliInfo(Form("Processing supermodule %i ...", ism)); | |
179 | ntracks += Clusters2TracksSM(ism, esd); | |
180 | } | |
980d5a2a | 181 | AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks)); |
41702fec | 182 | return ntracks; |
e4f2f73d | 183 | } |
184 | ||
0906e73e | 185 | |
186 | //_____________________________________________________________________________ | |
eb38ed55 | 187 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
0906e73e | 188 | { |
41702fec | 189 | //AliInfo(Form("Asking for tracklet %d", index)); |
190 | ||
84eab75a | 191 | // reset position of the point before using it |
192 | p.SetXYZ(0., 0., 0.); | |
2f7514a6 | 193 | AliTRDseedV1 *tracklet = GetTracklet(index); |
194 | if (!tracklet) return kFALSE; | |
84eab75a | 195 | |
41702fec | 196 | // get detector for this tracklet |
e165b64b | 197 | Int_t det = tracklet->GetDetector(); |
198 | Int_t sec = fGeom->GetSector(det); | |
199 | Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(), | |
200 | sinA = TMath::Sin(alpha), | |
201 | cosA = TMath::Cos(alpha); | |
41702fec | 202 | Double_t local[3]; |
e165b64b | 203 | local[0] = tracklet->GetX(); |
204 | local[1] = tracklet->GetY(); | |
205 | local[2] = tracklet->GetZ(); | |
41702fec | 206 | Double_t global[3]; |
e165b64b | 207 | fGeom->RotateBack(det, local, global); |
208 | ||
209 | Double_t cov2D[3]; Float_t cov[6]; | |
210 | tracklet->GetCovAt(local[0], cov2D); | |
211 | cov[0] = cov2D[0]*sinA*sinA; | |
212 | cov[1] =-cov2D[0]*sinA*cosA; | |
213 | cov[2] =-cov2D[1]*sinA; | |
214 | cov[3] = cov2D[0]*cosA*cosA; | |
215 | cov[4] = cov2D[1]*cosA; | |
216 | cov[5] = cov2D[2]; | |
217 | // store the global position of the tracklet and its covariance matrix in the track point | |
218 | p.SetXYZ(global[0],global[1],global[2], cov); | |
41702fec | 219 | |
220 | // setting volume id | |
e165b64b | 221 | AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det)); |
222 | Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det); | |
41702fec | 223 | UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId); |
224 | p.SetVolumeID(volid); | |
225 | ||
226 | return kTRUE; | |
0906e73e | 227 | } |
228 | ||
eb38ed55 | 229 | //____________________________________________________________________ |
230 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() | |
231 | { | |
41702fec | 232 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); |
233 | return fgTiltedRieman; | |
eb38ed55 | 234 | } |
0906e73e | 235 | |
eb38ed55 | 236 | //____________________________________________________________________ |
237 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() | |
238 | { | |
41702fec | 239 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); |
240 | return fgTiltedRiemanConstrained; | |
eb38ed55 | 241 | } |
41702fec | 242 | |
eb38ed55 | 243 | //____________________________________________________________________ |
244 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() | |
245 | { | |
fac58f00 | 246 | if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer); |
41702fec | 247 | return fgRieman; |
eb38ed55 | 248 | } |
41702fec | 249 | |
0906e73e | 250 | //_____________________________________________________________________________ |
251 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) | |
252 | { | |
2a3191bb | 253 | // Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building |
254 | // a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points, | |
255 | // covariance, PID, etc.) are than used to update the corresponding ESD track. | |
256 | // Each track seed is first propagated to the geometrical limit of the TRD detector. | |
257 | // Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are | |
258 | // constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated. | |
259 | // Otherwise the ESD track is left unchanged. | |
260 | // | |
261 | // The following steps are performed: | |
262 | // 1. Selection of tracks based on the variance in the y-z plane. | |
263 | // 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set. | |
264 | // 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking | |
265 | // the following status bits: | |
266 | // - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume | |
267 | // - AliESDtrack::kTRDStop - if the tracks fails propagation | |
268 | // - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting | |
269 | // 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout. | |
270 | // 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set. | |
271 | // | |
272 | ||
e3d45279 | 273 | if(!fClusters || !fClusters->GetEntriesFast()){ |
274 | AliInfo("No TRD clusters"); | |
275 | return 0; | |
276 | } | |
2a3191bb | 277 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor |
e3d45279 | 278 | if (!calibra) AliInfo("Could not get Calibra instance"); |
9e85cb05 | 279 | |
280 | printf("TB[%d] new TB[%d]\n", fgNTimeBins, fkReconstructor->GetNTimeBins()); | |
c6f7c6cb | 281 | if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins(); |
828c6f80 | 282 | |
eb2b4f91 | 283 | // Define scalers |
284 | Int_t nFound = 0, // number of tracks found | |
285 | nSeeds = 0, // total number of ESD seeds | |
286 | nTRDseeds= 0, // number of seeds in the TRD acceptance | |
287 | nTPCseeds= 0; // number of TPC seeds | |
41702fec | 288 | Float_t foundMin = 20.0; |
289 | ||
4d6aee34 | 290 | Float_t *quality = NULL; |
291 | Int_t *index = NULL; | |
eb2b4f91 | 292 | nSeeds = event->GetNumberOfTracks(); |
293 | // Sort tracks according to quality | |
294 | // (covariance in the yz plane) | |
295 | if(nSeeds){ | |
296 | quality = new Float_t[nSeeds]; | |
297 | index = new Int_t[nSeeds]; | |
298 | for (Int_t iSeed = nSeeds; iSeed--;) { | |
d611c74f | 299 | AliESDtrack *seed = event->GetTrack(iSeed); |
300 | Double_t covariance[15]; | |
301 | seed->GetExternalCovariance(covariance); | |
302 | quality[iSeed] = covariance[0] + covariance[2]; | |
303 | } | |
eb2b4f91 | 304 | TMath::Sort(nSeeds, quality, index,kFALSE); |
41702fec | 305 | } |
41702fec | 306 | |
eb2b4f91 | 307 | // Propagate all seeds |
41702fec | 308 | Int_t expectedClr; |
309 | AliTRDtrackV1 track; | |
eb2b4f91 | 310 | for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) { |
41702fec | 311 | |
312 | // Get the seeds in sorted sequence | |
313 | AliESDtrack *seed = event->GetTrack(index[iSeed]); | |
eb2b4f91 | 314 | Float_t p4 = seed->GetC(seed->GetBz()); |
41702fec | 315 | |
316 | // Check the seed status | |
317 | ULong_t status = seed->GetStatus(); | |
318 | if ((status & AliESDtrack::kTPCout) == 0) continue; | |
319 | if ((status & AliESDtrack::kTRDout) != 0) continue; | |
eb2b4f91 | 320 | |
321 | // Propagate to the entrance in the TRD mother volume | |
41702fec | 322 | new(&track) AliTRDtrackV1(*seed); |
eb2b4f91 | 323 | if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){ |
324 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
325 | continue; | |
326 | } | |
327 | if(!AdjustSector(&track)){ | |
328 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
329 | continue; | |
330 | } | |
331 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) { | |
332 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
333 | continue; | |
334 | } | |
335 | ||
336 | nTPCseeds++; | |
e4d4864b | 337 | |
eb2b4f91 | 338 | // store track status at TRD entrance |
76b60503 | 339 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
ae3fbe1f | 340 | |
eb2b4f91 | 341 | // prepare track and do propagation in the TRD |
4d6aee34 | 342 | track.SetReconstructor(fkReconstructor); |
eb2b4f91 | 343 | track.SetKink(Bool_t(seed->GetKinkIndex(0))); |
344 | expectedClr = FollowBackProlongation(track); | |
345 | // check if track entered the TRD fiducial volume | |
346 | if(track.GetTrackLow()){ | |
347 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); | |
348 | nTRDseeds++; | |
349 | } | |
350 | // check if track was stopped in the TRD | |
351 | if (expectedClr<0){ | |
352 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
353 | continue; | |
354 | } | |
ae3fbe1f | 355 | |
356 | if(expectedClr){ | |
eb2b4f91 | 357 | nFound++; |
41702fec | 358 | // computes PID for track |
359 | track.CookPID(); | |
360 | // update calibration references using this track | |
361 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); | |
362 | // save calibration object | |
9e85cb05 | 363 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 && |
364 | fkRecoParam->IsOverPtThreshold(track.Pt())){ | |
224f357f | 365 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); |
366 | calibTrack->SetOwner(); | |
367 | seed->AddCalibObject(calibTrack); | |
368 | } | |
369 | //update ESD track | |
050875b0 | 370 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
371 | track.UpdateESDtrack(seed); | |
41702fec | 372 | } |
373 | ||
27fbeba8 | 374 | if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) { |
e3cf3d02 | 375 | |
41702fec | 376 | // Make backup for back propagation |
41702fec | 377 | Int_t foundClr = track.GetNumberOfClusters(); |
378 | if (foundClr >= foundMin) { | |
41702fec | 379 | track.CookLabel(1. - fgkLabelFraction); |
f29f13a6 | 380 | //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); |
41702fec | 381 | |
382 | // Sign only gold tracks | |
383 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { | |
f29f13a6 | 384 | //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track); |
41702fec | 385 | } |
386 | Bool_t isGold = kFALSE; | |
387 | ||
388 | // Full gold track | |
389 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { | |
390 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
391 | ||
392 | isGold = kTRUE; | |
393 | } | |
394 | ||
395 | // Almost gold track | |
396 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { | |
397 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); | |
398 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
399 | ||
400 | isGold = kTRUE; | |
401 | } | |
402 | ||
403 | if ((!isGold) && (track.GetBackupTrack())) { | |
404 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { | |
405 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
406 | isGold = kTRUE; | |
407 | } | |
408 | } | |
41702fec | 409 | } |
410 | } | |
411 | ||
eb2b4f91 | 412 | // Propagation to the TOF |
413 | if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) { | |
414 | Int_t sm = track.GetSector(); | |
415 | // default value in case we have problems with the geometry. | |
416 | Double_t xtof = 371.; | |
417 | //Calculate radial position of the beginning of the TOF | |
418 | //mother volume. In order to avoid mixing of the TRD | |
419 | //and TOF modules some hard values are needed. This are: | |
420 | //1. The path to the TOF module. | |
421 | //2. The width of the TOF (29.05 cm) | |
422 | //(with the help of Annalisa de Caro Mar-17-2009) | |
423 | if(gGeoManager){ | |
424 | gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm)); | |
4d6aee34 | 425 | TGeoHMatrix *m = NULL; |
eb2b4f91 | 426 | Double_t loc[]={0., 0., -.5*29.05}, glob[3]; |
427 | ||
428 | if((m=gGeoManager->GetCurrentMatrix())){ | |
429 | m->LocalToMaster(loc, glob); | |
430 | xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]); | |
431 | } | |
41702fec | 432 | } |
672b48bd | 433 | if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){ |
434 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
435 | continue; | |
436 | } | |
437 | if(!AdjustSector(&track)){ | |
438 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
439 | continue; | |
440 | } | |
441 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){ | |
442 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
443 | continue; | |
444 | } | |
050875b0 | 445 | //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
eb2b4f91 | 446 | // TODO obsolete - delete |
447 | seed->SetTRDQuality(track.StatusForTOF()); | |
41702fec | 448 | } |
41702fec | 449 | seed->SetTRDBudget(track.GetBudget(0)); |
450 | } | |
d611c74f | 451 | if(index) delete [] index; |
452 | if(quality) delete [] quality; | |
41702fec | 453 | |
d4cf71ca | 454 | AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds)); |
455 | AliInfo(Form("Number of tracks: TRDout[%d]", nFound)); | |
456 | ||
d611c74f | 457 | // run stand alone tracking |
4d6aee34 | 458 | if (fkReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec | 459 | |
460 | return 0; | |
0906e73e | 461 | } |
462 | ||
463 | ||
464 | //____________________________________________________________________ | |
465 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) | |
466 | { | |
41702fec | 467 | // |
468 | // Refits tracks within the TRD. The ESD event is expected to contain seeds | |
469 | // at the outer part of the TRD. | |
470 | // The tracks are propagated to the innermost time bin | |
471 | // of the TRD and the ESD event is updated | |
472 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) | |
473 | // | |
474 | ||
475 | Int_t nseed = 0; // contor for loaded seeds | |
476 | Int_t found = 0; // contor for updated TRD tracks | |
477 | ||
478 | ||
e3d45279 | 479 | if(!fClusters || !fClusters->GetEntriesFast()){ |
480 | AliInfo("No TRD clusters"); | |
481 | return 0; | |
482 | } | |
41702fec | 483 | AliTRDtrackV1 track; |
484 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { | |
485 | AliESDtrack *seed = event->GetTrack(itrack); | |
050875b0 | 486 | ULong_t status = seed->GetStatus(); |
41702fec | 487 | |
050875b0 | 488 | new(&track) AliTRDtrackV1(*seed); |
41702fec | 489 | if (track.GetX() < 270.0) { |
490 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
491 | continue; | |
492 | } | |
493 | ||
e3cf3d02 | 494 | // reject tracks which failed propagation in the TRD or |
495 | // are produced by the TRD stand alone tracker | |
e3cf3d02 | 496 | if(!(status & AliESDtrack::kTRDout)) continue; |
497 | if(!(status & AliESDtrack::kTRDin)) continue; | |
41702fec | 498 | nseed++; |
499 | ||
500 | track.ResetCovariance(50.0); | |
501 | ||
502 | // do the propagation and processing | |
503 | Bool_t kUPDATE = kFALSE; | |
504 | Double_t xTPC = 250.0; | |
505 | if(FollowProlongation(track)){ | |
506 | // Prolongate to TPC | |
507 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update | |
e3cf3d02 | 508 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
509 | found++; | |
510 | kUPDATE = kTRUE; | |
511 | } | |
512 | ||
513 | // Update the friend track | |
9e85cb05 | 514 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0 && fkRecoParam->IsOverPtThreshold(track.Pt())){ |
4d6aee34 | 515 | TObject *o = NULL; Int_t ic = 0; |
516 | AliTRDtrackV1 *calibTrack = NULL; | |
e3cf3d02 | 517 | while((o = seed->GetCalibObject(ic++))){ |
518 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; | |
519 | calibTrack->SetTrackHigh(track.GetTrackHigh()); | |
520 | } | |
41702fec | 521 | } |
e3cf3d02 | 522 | } |
41702fec | 523 | |
524 | // Prolongate to TPC without update | |
525 | if(!kUPDATE) { | |
526 | AliTRDtrackV1 tt(*seed); | |
e3cf3d02 | 527 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup); |
41702fec | 528 | } |
529 | } | |
980d5a2a | 530 | AliInfo(Form("Number of seeds: TRDout[%d]", nseed)); |
531 | AliInfo(Form("Number of tracks: TRDrefit[%d]", found)); | |
41702fec | 532 | |
533 | return 0; | |
0906e73e | 534 | } |
535 | ||
0906e73e | 536 | //____________________________________________________________________ |
537 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) | |
538 | { | |
41702fec | 539 | // Extrapolates the TRD track in the TPC direction. |
540 | // | |
541 | // Parameters | |
542 | // t : the TRD track which has to be extrapolated | |
543 | // | |
544 | // Output | |
545 | // number of clusters attached to the track | |
546 | // | |
547 | // Detailed description | |
548 | // | |
549 | // Starting from current radial position of track <t> this function | |
550 | // extrapolates the track through the 6 TRD layers. The following steps | |
551 | // are being performed for each plane: | |
552 | // 1. prepare track: | |
553 | // a. get plane limits in the local x direction | |
554 | // b. check crossing sectors | |
555 | // c. check track inclination | |
556 | // 2. search tracklet in the tracker list (see GetTracklet() for details) | |
557 | // 3. evaluate material budget using the geo manager | |
558 | // 4. propagate and update track using the tracklet information. | |
559 | // | |
560 | // Debug level 2 | |
561 | // | |
562 | ||
e3cf3d02 | 563 | Bool_t kStoreIn = kTRUE; |
41702fec | 564 | Int_t nClustersExpected = 0; |
e3cf3d02 | 565 | for (Int_t iplane = kNPlanes; iplane--;) { |
17896e82 | 566 | Int_t index(-1); |
41702fec | 567 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
17896e82 | 568 | AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index)); |
41702fec | 569 | if(!tracklet) continue; |
980d5a2a | 570 | if(!tracklet->IsOK()){ |
571 | AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector())); | |
572 | continue; | |
573 | } | |
e3cf3d02 | 574 | Double_t x = tracklet->GetX();//GetX0(); |
41702fec | 575 | // reject tracklets which are not considered for inward refit |
576 | if(x > t.GetX()+fgkMaxStep) continue; | |
577 | ||
578 | // append tracklet to track | |
579 | t.SetTracklet(tracklet, index); | |
580 | ||
581 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; | |
582 | if (!AdjustSector(&t)) break; | |
583 | ||
584 | // Start global position | |
585 | Double_t xyz0[3]; | |
586 | t.GetXYZ(xyz0); | |
587 | ||
588 | // End global position | |
589 | Double_t alpha = t.GetAlpha(), y, z; | |
590 | if (!t.GetProlongation(x,y,z)) break; | |
591 | Double_t xyz1[3]; | |
592 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
593 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
594 | xyz1[2] = z; | |
595 | ||
51a23065 | 596 | Double_t length = TMath::Sqrt( |
597 | (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) + | |
598 | (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) + | |
599 | (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2]) | |
600 | ); | |
601 | if(length>0.){ | |
602 | // Get material budget | |
603 | Double_t param[7]; | |
604 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break; | |
605 | Double_t xrho= param[0]*param[4]; | |
606 | Double_t xx0 = param[1]; // Get mean propagation parameters | |
607 | ||
608 | // Propagate and update | |
609 | t.PropagateTo(x, xx0, xrho); | |
610 | if (!AdjustSector(&t)) break; | |
611 | } | |
e3cf3d02 | 612 | if(kStoreIn){ |
613 | t.SetTrackHigh(); | |
614 | kStoreIn = kFALSE; | |
615 | } | |
616 | ||
b72f4eaf | 617 | Double_t cov[3]; tracklet->GetCovAt(x, cov); |
618 | Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()}; | |
619 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); | |
620 | if (chi2 < 1e+10 && t.Update(p, cov, chi2)){ | |
41702fec | 621 | nClustersExpected += tracklet->GetN(); |
622 | } | |
623 | } | |
624 | ||
9e85cb05 | 625 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){ |
41702fec | 626 | Int_t index; |
51a23065 | 627 | for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){ |
41702fec | 628 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
629 | if(!tracklet) continue; | |
630 | t.SetTracklet(tracklet, index); | |
631 | } | |
632 | ||
a2fbb6ec | 633 | if(fkReconstructor->IsDebugStreaming()){ |
634 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
635 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); | |
636 | AliTRDtrackV1 track(t); | |
637 | track.SetOwner(); | |
638 | cstreamer << "FollowProlongation" | |
639 | << "EventNumber=" << eventNumber | |
640 | << "ncl=" << nClustersExpected | |
641 | << "track.=" << &track | |
642 | << "\n"; | |
643 | } | |
41702fec | 644 | } |
41702fec | 645 | return nClustersExpected; |
0906e73e | 646 | |
647 | } | |
648 | ||
649 | //_____________________________________________________________________________ | |
650 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) | |
651 | { | |
afa21247 | 652 | // Extrapolates/Build the TRD track in the TOF direction. |
653 | // | |
654 | // Parameters | |
655 | // t : the TRD track which has to be extrapolated | |
656 | // | |
657 | // Output | |
658 | // number of clusters attached to the track | |
659 | // | |
660 | // Starting from current radial position of track <t> this function | |
661 | // extrapolates the track through the 6 TRD layers. The following steps | |
662 | // are being performed for each plane: | |
663 | // 1. Propagate track to the entrance of the next chamber: | |
664 | // - get chamber limits in the radial direction | |
665 | // - check crossing sectors | |
666 | // - check track inclination | |
667 | // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary()) | |
668 | // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only | |
669 | // Kalman filter is needed and tracklets are already linked to the track this step is skipped. | |
670 | // 3. Fit tracklet using the information from the Kalman filter. | |
671 | // 4. Propagate and update track at reference radial position of the tracklet. | |
672 | // 5. Register tracklet with the tracker and track; update pulls monitoring. | |
673 | // | |
674 | // Observation | |
2a3191bb | 675 | // 1. During the propagation a bit map is filled detailing the status of the track in each TRD chamber. The following errors are being registered for each tracklet: |
676 | // - AliTRDtrackV1::kProlongation : track prolongation failed | |
677 | // - AliTRDtrackV1::kPropagation : track prolongation failed | |
678 | // - AliTRDtrackV1::kAdjustSector : failed during sector crossing | |
679 | // - AliTRDtrackV1::kSnp : too large bending | |
680 | // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet | |
681 | // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet | |
682 | // - AliTRDtrackV1::kUnknown : anything which is not covered before | |
afa21247 | 683 | // 2. By default the status of the track before first TRD update is saved. |
684 | // | |
685 | // Debug level 2 | |
686 | // | |
687 | // Author | |
688 | // Alexandru Bercuci <A.Bercuci@gsi.de> | |
689 | // | |
41702fec | 690 | |
eb2b4f91 | 691 | Int_t n = 0; |
692 | Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); | |
4d6aee34 | 693 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 694 | |
9e85cb05 | 695 | Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0; |
7c3eecb8 | 696 | TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0; |
697 | ||
4d6aee34 | 698 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
181d2c97 | 699 | // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array |
700 | AliTRDseedV1 *tracklets[kNPlanes]; | |
701 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); | |
702 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
703 | tracklets[ip] = t.GetTracklet(ip); | |
704 | t.UnsetTracklet(ip); | |
705 | } | |
b06a50a5 | 706 | Bool_t kStoreIn(kTRUE), // |
707 | kPropagateIn(kTRUE),// | |
9e85cb05 | 708 | kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman |
e3cf3d02 | 709 | |
053767a4 | 710 | // Loop through the TRD layers |
4d6aee34 | 711 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 712 | Double_t x, y, z; |
713 | for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) { | |
1bd708e3 | 714 | AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily])); |
715 | ||
eb2b4f91 | 716 | // rough estimate of the entry point |
717 | if (!t.GetProlongation(fR[ily], y, z)){ | |
718 | n=-1; | |
719 | t.SetStatus(AliTRDtrackV1::kProlongation); | |
1bd708e3 | 720 | AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z)); |
eb2b4f91 | 721 | break; |
722 | } | |
41702fec | 723 | |
eb2b4f91 | 724 | // find sector / stack / detector |
725 | sm = t.GetSector(); | |
726 | // TODO cross check with y value ! | |
727 | stk = fGeom->GetStack(z, ily); | |
728 | det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1; | |
4d6aee34 | 729 | matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL; |
1bd708e3 | 730 | AliDebug(3, Form("Propagate to det[%3d]", det)); |
eb2b4f91 | 731 | |
732 | // check if supermodule/chamber is installed | |
733 | if( !fGeom->GetSMstatus(sm) || | |
734 | stk<0. || | |
735 | fGeom->IsHole(ily, stk, sm) || | |
736 | !matrix ){ | |
1bd708e3 | 737 | AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily)); |
eb2b4f91 | 738 | // propagate to the default radial position |
739 | if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){ | |
740 | n=-1; | |
741 | t.SetStatus(AliTRDtrackV1::kPropagation); | |
1bd708e3 | 742 | AliDebug(4, "Failed Propagation [Missing Geometry]"); |
41702fec | 743 | break; |
744 | } | |
eb2b4f91 | 745 | if(!AdjustSector(&t)){ |
746 | n=-1; | |
747 | t.SetStatus(AliTRDtrackV1::kAdjustSector); | |
1bd708e3 | 748 | AliDebug(4, "Failed Adjust Sector [Missing Geometry]"); |
eb2b4f91 | 749 | break; |
750 | } | |
751 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){ | |
752 | n=-1; | |
753 | t.SetStatus(AliTRDtrackV1::kSnp); | |
1bd708e3 | 754 | AliDebug(4, "Failed Max Snp [Missing Geometry]"); |
eb2b4f91 | 755 | break; |
756 | } | |
757 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); | |
41702fec | 758 | continue; |
759 | } | |
e3cf3d02 | 760 | |
eb2b4f91 | 761 | // retrieve rotation matrix for the current chamber |
762 | Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.}; | |
763 | Double_t glb[] = {0., 0., 0.}; | |
764 | matrix->LocalToMaster(loc, glb); | |
765 | ||
766 | // Propagate to the radial distance of the current layer | |
767 | x = glb[0] - fgkMaxStep; | |
768 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){ | |
769 | n=-1; | |
770 | t.SetStatus(AliTRDtrackV1::kPropagation); | |
1bd708e3 | 771 | AliDebug(4, Form("Failed Initial Propagation to x[%7.2f]", x)); |
eb2b4f91 | 772 | break; |
773 | } | |
774 | if(!AdjustSector(&t)){ | |
775 | n=-1; | |
776 | t.SetStatus(AliTRDtrackV1::kAdjustSector); | |
1bd708e3 | 777 | AliDebug(4, "Failed Adjust Sector Start"); |
eb2b4f91 | 778 | break; |
779 | } | |
780 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { | |
781 | n=-1; | |
782 | t.SetStatus(AliTRDtrackV1::kSnp); | |
1bd708e3 | 783 | AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp)); |
eb2b4f91 | 784 | break; |
785 | } | |
4d6aee34 | 786 | Bool_t doRecalculate = kFALSE; |
eb2b4f91 | 787 | if(sm != t.GetSector()){ |
788 | sm = t.GetSector(); | |
4d6aee34 | 789 | doRecalculate = kTRUE; |
eb2b4f91 | 790 | } |
791 | if(stk != fGeom->GetStack(z, ily)){ | |
792 | stk = fGeom->GetStack(z, ily); | |
4d6aee34 | 793 | doRecalculate = kTRUE; |
eb2b4f91 | 794 | } |
4d6aee34 | 795 | if(doRecalculate){ |
eb2b4f91 | 796 | det = AliTRDgeometry::GetDetector(ily, stk, sm); |
797 | if(!(matrix = fGeom->GetClusterMatrix(det))){ | |
798 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); | |
1bd708e3 | 799 | AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily)); |
eb2b4f91 | 800 | continue; |
801 | } | |
802 | matrix->LocalToMaster(loc, glb); | |
803 | x = glb[0] - fgkMaxStep; | |
804 | } | |
805 | ||
806 | // check if track is well inside fiducial volume | |
807 | if (!t.GetProlongation(x+fgkMaxStep, y, z)) { | |
808 | n=-1; | |
809 | t.SetStatus(AliTRDtrackV1::kProlongation); | |
1bd708e3 | 810 | AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+fgkMaxStep, y, z)); |
eb2b4f91 | 811 | break; |
812 | } | |
813 | if(fGeom->IsOnBoundary(det, y, z, .5)){ | |
814 | t.SetStatus(AliTRDtrackV1::kBoundary, ily); | |
1bd708e3 | 815 | AliDebug(4, "Failed Track on Boundary"); |
eb2b4f91 | 816 | continue; |
817 | } | |
818 | // mark track as entering the FIDUCIAL volume of TRD | |
e3cf3d02 | 819 | if(kStoreIn){ |
820 | t.SetTrackLow(); | |
821 | kStoreIn = kFALSE; | |
822 | } | |
b1957d3c | 823 | |
eb2b4f91 | 824 | ptrTracklet = tracklets[ily]; |
825 | if(!ptrTracklet){ // BUILD TRACKLET | |
1bd708e3 | 826 | AliDebug(3, Form("Building tracklet det[%d]", det)); |
eb2b4f91 | 827 | // check data in supermodule |
828 | if(!fTrSec[sm].GetNChambers()){ | |
829 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); | |
1bd708e3 | 830 | AliDebug(4, "Failed NoClusters"); |
eb2b4f91 | 831 | continue; |
832 | } | |
833 | if(fTrSec[sm].GetX(ily) < 1.){ | |
834 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); | |
1bd708e3 | 835 | AliDebug(4, "Failed NoX"); |
eb2b4f91 | 836 | continue; |
837 | } | |
838 | ||
839 | // check data in chamber | |
840 | if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){ | |
841 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); | |
1bd708e3 | 842 | AliDebug(4, "Failed No Detector"); |
eb2b4f91 | 843 | continue; |
844 | } | |
9e85cb05 | 845 | if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){ |
eb2b4f91 | 846 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
1bd708e3 | 847 | AliDebug(4, "Failed Not Enough Clusters in Detector"); |
eb2b4f91 | 848 | continue; |
849 | } | |
850 | // build tracklet | |
851 | ptrTracklet = new(&tracklet) AliTRDseedV1(det); | |
4d6aee34 | 852 | ptrTracklet->SetReconstructor(fkReconstructor); |
eb2b4f91 | 853 | ptrTracklet->SetKink(t.IsKink()); |
854 | ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk)); | |
855 | ptrTracklet->SetX0(glb[0]+driftLength); | |
856 | if(!tracklet.Init(&t)){ | |
857 | n=-1; | |
858 | t.SetStatus(AliTRDtrackV1::kTrackletInit); | |
1bd708e3 | 859 | AliDebug(4, "Failed Tracklet Init"); |
eb2b4f91 | 860 | break; |
861 | } | |
862 | if(!tracklet.AttachClusters(chamber, kTRUE)){ | |
863 | t.SetStatus(AliTRDtrackV1::kNoAttach, ily); | |
7c3eecb8 | 864 | if(debugLevel>3){ |
865 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
866 | UChar_t status(t.GetStatusTRD(ily)); | |
867 | (*cstreamer) << "FollowBackProlongation2" | |
868 | <<"status=" << status | |
869 | <<"tracklet.=" << &trackletCp | |
870 | << "\n"; | |
871 | } | |
1bd708e3 | 872 | AliDebug(4, "Failed Attach Clusters"); |
eb2b4f91 | 873 | continue; |
874 | } | |
1bd708e3 | 875 | AliDebug(3, Form("Number of Clusters in Tracklet: %d", tracklet.GetN())); |
9e85cb05 | 876 | if(tracklet.GetN() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){ |
eb2b4f91 | 877 | t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily); |
7c3eecb8 | 878 | if(debugLevel>3){ |
879 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
880 | UChar_t status(t.GetStatusTRD(ily)); | |
881 | (*cstreamer) << "FollowBackProlongation2" | |
882 | <<"status=" << status | |
883 | <<"tracklet.=" << &trackletCp | |
884 | << "\n"; | |
885 | } | |
1bd708e3 | 886 | AliDebug(4, "Failed N Clusters Attached"); |
eb2b4f91 | 887 | continue; |
888 | } | |
889 | ptrTracklet->UpdateUsed(); | |
0217fcd0 | 890 | } else AliDebug(2, Form("Use external tracklet ly[%d]", ily)); |
eb2b4f91 | 891 | // propagate track to the radial position of the tracklet |
892 | ptrTracklet->UseClusters(); // TODO ? do we need this here ? | |
893 | // fit tracklet no tilt correction | |
894 | if(!ptrTracklet->Fit(kFALSE)){ | |
895 | t.SetStatus(AliTRDtrackV1::kNoFit, ily); | |
1bd708e3 | 896 | AliDebug(4, "Failed Tracklet Fit"); |
eb2b4f91 | 897 | continue; |
898 | } | |
899 | x = ptrTracklet->GetX(); //GetX0(); | |
900 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) { | |
901 | n=-1; | |
902 | t.SetStatus(AliTRDtrackV1::kPropagation); | |
1bd708e3 | 903 | AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x)); |
eb2b4f91 | 904 | break; |
905 | } | |
906 | if(!AdjustSector(&t)) { | |
907 | n=-1; | |
908 | t.SetStatus(AliTRDtrackV1::kAdjustSector); | |
1bd708e3 | 909 | AliDebug(4, "Failed Adjust Sector"); |
eb2b4f91 | 910 | break; |
41702fec | 911 | } |
eb2b4f91 | 912 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { |
913 | n=-1; | |
914 | t.SetStatus(AliTRDtrackV1::kSnp); | |
1bd708e3 | 915 | AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), fgkMaxSnp)); |
eb2b4f91 | 916 | break; |
917 | } | |
81a6494d | 918 | if(kPropagateIn){ |
919 | t.SetTrackLow(); | |
920 | kPropagateIn = kFALSE; | |
921 | } | |
b72f4eaf | 922 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
923 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; | |
924 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); | |
6e39bde4 | 925 | // update Kalman with the TRD measurement |
b72f4eaf | 926 | if(chi2>1e+10){ // TODO |
eb2b4f91 | 927 | t.SetStatus(AliTRDtrackV1::kChi2, ily); |
7c3eecb8 | 928 | if(debugLevel > 2){ |
929 | UChar_t status(t.GetStatusTRD()); | |
930 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
931 | AliTRDtrackV1 trackCp(t); | |
932 | trackCp.SetOwner(); | |
933 | (*cstreamer) << "FollowBackProlongation1" | |
934 | << "status=" << status | |
935 | << "tracklet.=" << &trackletCp | |
936 | << "track.=" << &trackCp | |
937 | << "\n"; | |
938 | } | |
1bd708e3 | 939 | AliDebug(4, Form("Failed Chi2[%f]", chi2)); |
eb2b4f91 | 940 | continue; |
941 | } | |
b06a50a5 | 942 | if(!t.Update(p, cov, chi2, kUseTRD)) { |
eb2b4f91 | 943 | n=-1; |
944 | t.SetStatus(AliTRDtrackV1::kUpdate); | |
7c3eecb8 | 945 | if(debugLevel > 2){ |
946 | UChar_t status(t.GetStatusTRD()); | |
947 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
948 | AliTRDtrackV1 trackCp(t); | |
949 | trackCp.SetOwner(); | |
950 | (*cstreamer) << "FollowBackProlongation1" | |
951 | << "status=" << status | |
952 | << "tracklet.=" << &trackletCp | |
953 | << "track.=" << &trackCp | |
954 | << "\n"; | |
955 | } | |
1bd708e3 | 956 | AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1])); |
eb2b4f91 | 957 | break; |
958 | } | |
b72f4eaf | 959 | // fill residuals ?! |
960 | AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId()); | |
961 | ||
eb2b4f91 | 962 | |
963 | // load tracklet to the tracker | |
16cca13f | 964 | ptrTracklet->Update(&t); |
eb2b4f91 | 965 | ptrTracklet = SetTracklet(ptrTracklet); |
17896e82 | 966 | Int_t index(fTracklets->GetEntriesFast()-1); |
967 | t.SetTracklet(ptrTracklet, index); | |
eb2b4f91 | 968 | n += ptrTracklet->GetN(); |
17896e82 | 969 | AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index)); |
eb2b4f91 | 970 | |
41702fec | 971 | // Reset material budget if 2 consecutive gold |
eb2b4f91 | 972 | // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec | 973 | |
974 | // Make backup of the track until is gold | |
975 | // TO DO update quality check of the track. | |
976 | // consider comparison with fTimeBinsRange | |
977 | Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins); | |
978 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); | |
41702fec | 979 | |
eb2b4f91 | 980 | if( (chi2 < 18.0) && |
41702fec | 981 | (ratio0 > 0.8) && |
982 | //(ratio1 > 0.6) && | |
983 | //(ratio0+ratio1 > 1.5) && | |
984 | (t.GetNCross() == 0) && | |
985 | (TMath::Abs(t.GetSnp()) < 0.85) && | |
e3cf3d02 | 986 | (t.GetNumberOfClusters() > 20)){ |
987 | t.MakeBackupTrack(); | |
9e85cb05 | 988 | } else AliDebug(2, Form("Failed backup : \n" |
989 | "chi2 < 18.0 [%c] chi2=%f\n" | |
990 | "ratio0 > 0.8 [%c] ratio=%f\n" | |
991 | "t.GetNCross()==0 [%c] crosses=%d\n" | |
992 | "Abs(t.GetSnp())<0.85 [%c] snp=%f\n" | |
993 | "t.GetNumberOfClusters()>20 [%c] ncls=%d" | |
994 | ,(chi2<18.0)?'y':'n', chi2 | |
995 | ,(ratio0>0.8)?'y':'n', ratio0 | |
996 | ,(t.GetNCross()==0)?'y':'n', t.GetNCross() | |
997 | ,(TMath::Abs(t.GetSnp())<0.85)?'y':'n', TMath::Abs(t.GetSnp()) | |
998 | ,(t.GetNumberOfClusters()>20)?'y':'n', t.GetNumberOfClusters() | |
999 | )); | |
1000 | ||
053767a4 | 1001 | } // end layers loop |
eb2b4f91 | 1002 | //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD()); |
1003 | //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n"); | |
41702fec | 1004 | |
7c3eecb8 | 1005 | if(debugLevel > 1){ |
41702fec | 1006 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
eb2b4f91 | 1007 | AliTRDtrackV1 track(t); |
1008 | track.SetOwner(); | |
7c3eecb8 | 1009 | (*cstreamer) << "FollowBackProlongation0" |
eb2b4f91 | 1010 | << "EventNumber=" << eventNumber |
1011 | << "ncl=" << n | |
1012 | << "track.=" << &track | |
41702fec | 1013 | << "\n"; |
1014 | } | |
1015 | ||
eb2b4f91 | 1016 | return n; |
0906e73e | 1017 | } |
1018 | ||
eb38ed55 | 1019 | //_________________________________________________________________________ |
4d6aee34 | 1020 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){ |
41702fec | 1021 | // |
1022 | // Fits a Riemann-circle to the given points without tilting pad correction. | |
1023 | // The fit is performed using an instance of the class AliRieman (equations | |
1024 | // and transformations see documentation of this class) | |
1025 | // Afterwards all the tracklets are Updated | |
1026 | // | |
1027 | // Parameters: - Array of tracklets (AliTRDseedV1) | |
1028 | // - Storage for the chi2 values (beginning with direction z) | |
1029 | // - Seeding configuration | |
1030 | // Output: - The curvature | |
1031 | // | |
1032 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
1033 | fitter->Reset(); | |
1034 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; | |
1035 | Int_t *ppl = &allplanes[0]; | |
1036 | Int_t maxLayers = 6; | |
1037 | if(planes){ | |
1038 | maxLayers = 4; | |
1039 | ppl = planes; | |
1040 | } | |
1041 | for(Int_t il = 0; il < maxLayers; il++){ | |
1042 | if(!tracklets[ppl[il]].IsOK()) continue; | |
e3cf3d02 | 1043 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10); |
41702fec | 1044 | } |
1045 | fitter->Update(); | |
1046 | // Set the reference position of the fit and calculate the chi2 values | |
1047 | memset(chi2, 0, sizeof(Double_t) * 2); | |
1048 | for(Int_t il = 0; il < maxLayers; il++){ | |
1049 | // Reference positions | |
1050 | tracklets[ppl[il]].Init(fitter); | |
1051 | ||
1052 | // chi2 | |
1053 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; | |
1054 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); | |
1055 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); | |
1056 | } | |
1057 | return fitter->GetC(); | |
eb38ed55 | 1058 | } |
1059 | ||
1060 | //_________________________________________________________________________ | |
1061 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) | |
1062 | { | |
41702fec | 1063 | // |
1064 | // Performs a Riemann helix fit using the seedclusters as spacepoints | |
1065 | // Afterwards the chi2 values are calculated and the seeds are updated | |
1066 | // | |
1067 | // Parameters: - The four seedclusters | |
1068 | // - The tracklet array (AliTRDseedV1) | |
1069 | // - The seeding configuration | |
1070 | // - Chi2 array | |
1071 | // | |
1072 | // debug level 2 | |
1073 | // | |
1074 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
1075 | fitter->Reset(); | |
a3743898 | 1076 | for(Int_t i = 0; i < 4; i++){ |
a3743898 | 1077 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.); |
1078 | } | |
41702fec | 1079 | fitter->Update(); |
1080 | ||
1081 | ||
1082 | // Update the seed and calculated the chi2 value | |
1083 | chi2[0] = 0; chi2[1] = 0; | |
1084 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ | |
1085 | // chi2 | |
1086 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); | |
1087 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); | |
1088 | } | |
eb38ed55 | 1089 | } |
1090 | ||
1091 | ||
1092 | //_________________________________________________________________________ | |
1093 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) | |
1094 | { | |
41702fec | 1095 | // |
1096 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is | |
1097 | // assumed that the vertex position is set to 0. | |
1098 | // This method is very usefull for high-pt particles | |
1099 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 | |
1100 | // x0, y0: Center of the circle | |
1101 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) | |
1102 | // zc: center of the pad row | |
1103 | // Equation which has to be fitted (after transformation): | |
1104 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 | |
1105 | // Transformation: | |
1106 | // t = 1/(x^2 + y^2) | |
1107 | // u = 2 * x * t | |
1108 | // v = 2 * x * tan(phiT) * t | |
1109 | // Parameters in the equation: | |
1110 | // a = -1/y0, b = x0/y0, e = dz/dx | |
1111 | // | |
1112 | // The Curvature is calculated by the following equation: | |
1113 | // - curv = a/Sqrt(b^2 + 1) = 1/R | |
1114 | // Parameters: - the 6 tracklets | |
1115 | // - the Vertex constraint | |
1116 | // Output: - the Chi2 value of the track | |
1117 | // | |
1118 | // debug level 5 | |
1119 | // | |
1120 | ||
1121 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); | |
1122 | fitter->StoreData(kTRUE); | |
1123 | fitter->ClearPoints(); | |
4d6aee34 | 1124 | AliTRDcluster *cl = NULL; |
41702fec | 1125 | |
1126 | Float_t x, y, z, w, t, error, tilt; | |
1127 | Double_t uvt[2]; | |
1128 | Int_t nPoints = 0; | |
053767a4 | 1129 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
1130 | if(!tracklets[ilr].IsOK()) continue; | |
8d2bec9e | 1131 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
053767a4 | 1132 | if(!tracklets[ilr].IsUsable(itb)) continue; |
1133 | cl = tracklets[ilr].GetClusters(itb); | |
1742f24c | 1134 | if(!cl->IsInChamber()) continue; |
41702fec | 1135 | x = cl->GetX(); |
1136 | y = cl->GetY(); | |
1137 | z = cl->GetZ(); | |
053767a4 | 1138 | tilt = tracklets[ilr].GetTilt(); |
41702fec | 1139 | // Transformation |
1140 | t = 1./(x * x + y * y); | |
1141 | uvt[0] = 2. * x * t; | |
1142 | uvt[1] = 2. * x * t * tilt ; | |
1143 | w = 2. * (y + tilt * (z - zVertex)) * t; | |
78b7d24c | 1144 | error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t; |
41702fec | 1145 | fitter->AddPoint(uvt, w, error); |
1146 | nPoints++; | |
1147 | } | |
1148 | } | |
e17f4785 | 1149 | fitter->Eval(); |
41702fec | 1150 | |
1151 | // Calculate curvature | |
1152 | Double_t a = fitter->GetParameter(0); | |
1153 | Double_t b = fitter->GetParameter(1); | |
1154 | Double_t curvature = a/TMath::Sqrt(b*b + 1); | |
1155 | ||
1156 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1157 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) | |
e3cf3d02 | 1158 | tracklets[ip].SetC(curvature); |
41702fec | 1159 | |
a2fbb6ec | 1160 | /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){ |
41702fec | 1161 | //Linear Model on z-direction |
1162 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack | |
1163 | Double_t slope = fitter->GetParameter(2); | |
1164 | Double_t zref = slope * xref; | |
1165 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); | |
1166 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
1167 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 1168 | TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 1169 | treeStreamer << "FitTiltedRiemanConstraint" |
1170 | << "EventNumber=" << eventNumber | |
1171 | << "CandidateNumber=" << candidateNumber | |
1172 | << "Curvature=" << curvature | |
1173 | << "Chi2Track=" << chi2track | |
1174 | << "Chi2Z=" << chi2Z | |
1175 | << "zref=" << zref | |
1176 | << "\n"; | |
3a039a31 | 1177 | }*/ |
41702fec | 1178 | return chi2track; |
eb38ed55 | 1179 | } |
1180 | ||
1181 | //_________________________________________________________________________ | |
1182 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) | |
1183 | { | |
41702fec | 1184 | // |
1185 | // Performs a Riemann fit taking tilting pad correction into account | |
1186 | // The equation of a Riemann circle, where the y position is substituted by the | |
1187 | // measured y-position taking pad tilting into account, has to be transformed | |
1188 | // into a 4-dimensional hyperplane equation | |
1189 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 | |
1190 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) | |
1191 | // zc: center of the pad row | |
1192 | // zt: z-position of the track | |
1193 | // The z-position of the track is assumed to be linear dependent on the x-position | |
1194 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 | |
1195 | // Transformation: u = 2 * x * t | |
1196 | // v = 2 * tan(phiT) * t | |
1197 | // w = 2 * tan(phiT) * (x - xref) * t | |
1198 | // t = 1 / (x^2 + ymeas^2) | |
1199 | // Parameters: a = -1/y0 | |
1200 | // b = x0/y0 | |
1201 | // c = (R^2 -x0^2 - y0^2)/y0 | |
1202 | // d = offset | |
1203 | // e = dz/dx | |
1204 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using | |
1205 | // results from the simple riemann fit. Afterwards the fit is redone. | |
1206 | // The curvature is calculated according to the formula: | |
1207 | // curv = a/(1 + b^2 + c*a) = 1/R | |
1208 | // | |
1209 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1210 | // - Flag selecting the error definition | |
1211 | // Output: - Chi2 values of the track (in Parameter list) | |
1212 | // | |
1213 | TLinearFitter *fitter = GetTiltedRiemanFitter(); | |
1214 | fitter->StoreData(kTRUE); | |
1215 | fitter->ClearPoints(); | |
1216 | AliTRDLeastSquare zfitter; | |
4d6aee34 | 1217 | AliTRDcluster *cl = NULL; |
41702fec | 1218 | |
1219 | Double_t xref = CalculateReferenceX(tracklets); | |
6e39bde4 | 1220 | Double_t x, y, z, t, tilt, dx, w, we, erry, errz; |
1221 | Double_t uvt[4], sumPolY[5], sumPolZ[3]; | |
1222 | memset(sumPolY, 0, sizeof(Double_t) * 5); | |
1223 | memset(sumPolZ, 0, sizeof(Double_t) * 3); | |
41702fec | 1224 | Int_t nPoints = 0; |
1225 | // Containers for Least-square fitter | |
1226 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1227 | if(!tracklets[ipl].IsOK()) continue; | |
ed15ef4f | 1228 | tilt = tracklets[ipl].GetTilt(); |
8d2bec9e | 1229 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec | 1230 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1742f24c | 1231 | if(!cl->IsInChamber()) continue; |
41702fec | 1232 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1233 | x = cl->GetX(); | |
1234 | y = cl->GetY(); | |
1235 | z = cl->GetZ(); | |
41702fec | 1236 | dx = x - xref; |
1237 | // Transformation | |
1238 | t = 1./(x*x + y*y); | |
1239 | uvt[0] = 2. * x * t; | |
1240 | uvt[1] = t; | |
1241 | uvt[2] = 2. * tilt * t; | |
1242 | uvt[3] = 2. * tilt * dx * t; | |
1243 | w = 2. * (y + tilt*z) * t; | |
1244 | // error definition changes for the different calls | |
1245 | we = 2. * t; | |
78b7d24c | 1246 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2; |
41702fec | 1247 | fitter->AddPoint(uvt, w, we); |
1248 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
6e39bde4 | 1249 | // adding points for covariance matrix estimation |
1250 | erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration) | |
1251 | erry *= erry; | |
1252 | errz = 1./cl->GetSigmaZ2(); | |
1253 | for(Int_t ipol = 0; ipol < 5; ipol++){ | |
1254 | sumPolY[ipol] += erry; | |
1255 | erry *= x; | |
1256 | if(ipol < 3){ | |
1257 | sumPolZ[ipol] += errz; | |
1258 | errz *= x; | |
1259 | } | |
1260 | } | |
41702fec | 1261 | nPoints++; |
1262 | } | |
1263 | } | |
e17f4785 | 1264 | fitter->Eval(); |
41702fec | 1265 | zfitter.Eval(); |
1266 | ||
1267 | Double_t offset = fitter->GetParameter(3); | |
1268 | Double_t slope = fitter->GetParameter(4); | |
1269 | ||
1270 | // Linear fitter - not possible to make boundaries | |
1271 | // Do not accept non possible z and dzdx combinations | |
1272 | Bool_t acceptablez = kTRUE; | |
1273 | Double_t zref = 0.0; | |
1274 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1275 | if(!tracklets[iLayer].IsOK()) continue; | |
1276 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1277 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
41702fec | 1278 | acceptablez = kFALSE; |
1279 | } | |
1280 | if (!acceptablez) { | |
1281 | Double_t dzmf = zfitter.GetFunctionParameter(1); | |
1282 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1283 | fgTiltedRieman->FixParameter(3, zmf); | |
1284 | fgTiltedRieman->FixParameter(4, dzmf); | |
e17f4785 | 1285 | fitter->Eval(); |
41702fec | 1286 | fitter->ReleaseParameter(3); |
1287 | fitter->ReleaseParameter(4); | |
1288 | offset = fitter->GetParameter(3); | |
1289 | slope = fitter->GetParameter(4); | |
1290 | } | |
1291 | ||
1292 | // Calculate Curvarture | |
1293 | Double_t a = fitter->GetParameter(0); | |
1294 | Double_t b = fitter->GetParameter(1); | |
1295 | Double_t c = fitter->GetParameter(2); | |
1296 | Double_t curvature = 1.0 + b*b - c*a; | |
1297 | if (curvature > 0.0) | |
1298 | curvature = a / TMath::Sqrt(curvature); | |
1299 | ||
1300 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1301 | ||
6e39bde4 | 1302 | // Prepare error calculation |
1303 | TMatrixD covarPolY(3,3); | |
1304 | covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4]; | |
1305 | covarPolY(0,1) = covarPolY(1,0) = sumPolY[1]; | |
1306 | covarPolY(0,2) = covarPolY(2,0) = sumPolY[2]; | |
1307 | covarPolY(2,1) = covarPolY(1,2) = sumPolY[3]; | |
1308 | covarPolY.Invert(); | |
1309 | TMatrixD covarPolZ(2,2); | |
1310 | covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2]; | |
1311 | covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1]; | |
1312 | covarPolZ.Invert(); | |
1313 | ||
41702fec | 1314 | // Update the tracklets |
6e39bde4 | 1315 | Double_t x1, dy, dz; |
1316 | Double_t cov[15]; | |
1317 | memset(cov, 0, sizeof(Double_t) * 15); | |
41702fec | 1318 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { |
1319 | ||
1320 | x = tracklets[iLayer].GetX0(); | |
6e39bde4 | 1321 | x1 = x - xref; |
41702fec | 1322 | y = 0; |
1323 | z = 0; | |
1324 | dy = 0; | |
1325 | dz = 0; | |
6e39bde4 | 1326 | memset(cov, 0, sizeof(Double_t) * 3); |
1327 | TMatrixD transform(3,3); | |
1328 | transform(0,0) = 1; | |
1329 | transform(0,1) = x; | |
1330 | transform(0,2) = x*x; | |
1331 | transform(1,1) = 1; | |
1332 | transform(1,2) = x; | |
1333 | transform(2,2) = 1; | |
1334 | TMatrixD covariance(transform, TMatrixD::kMult, covarPolY); | |
1335 | covariance *= transform.T(); | |
1336 | TMatrixD transformZ(2,2); | |
1337 | transformZ(0,0) = transformZ(1,1) = 1; | |
1338 | transformZ(0,1) = x; | |
1339 | TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ); | |
1340 | covarZ *= transformZ.T(); | |
41702fec | 1341 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1342 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1343 | // R = Sqrt() = 1/Curvature | |
1344 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
1345 | Double_t res = (x * a + b); // = (x - x0)/y0 | |
1346 | res *= res; | |
1347 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 | |
1348 | if (res >= 0) { | |
1349 | res = TMath::Sqrt(res); | |
1350 | y = (1.0 - res) / a; | |
1351 | } | |
6e39bde4 | 1352 | cov[0] = covariance(0,0); |
1353 | cov[2] = covarZ(0,0); | |
1354 | cov[1] = 0.; | |
41702fec | 1355 | |
1356 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
1357 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
1358 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1359 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
1360 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
1361 | Double_t x0 = -b / a; | |
1362 | if (-c * a + b * b + 1 > 0) { | |
1363 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
6e39bde4 | 1364 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); |
1365 | if (a < 0) yderiv *= -1.0; | |
1366 | dy = yderiv; | |
41702fec | 1367 | } |
1368 | } | |
1369 | z = offset + slope * (x - xref); | |
1370 | dz = slope; | |
1371 | tracklets[iLayer].SetYref(0, y); | |
1372 | tracklets[iLayer].SetYref(1, dy); | |
1373 | tracklets[iLayer].SetZref(0, z); | |
1374 | tracklets[iLayer].SetZref(1, dz); | |
1375 | tracklets[iLayer].SetC(curvature); | |
6e39bde4 | 1376 | tracklets[iLayer].SetCovRef(cov); |
41702fec | 1377 | tracklets[iLayer].SetChi2(chi2track); |
1378 | } | |
1379 | ||
a2fbb6ec | 1380 | /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){ |
1381 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); | |
41702fec | 1382 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1383 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
1384 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); | |
1385 | cstreamer << "FitTiltedRieman0" | |
1386 | << "EventNumber=" << eventNumber | |
1387 | << "CandidateNumber=" << candidateNumber | |
1388 | << "xref=" << xref | |
1389 | << "Chi2Z=" << chi2z | |
1390 | << "\n"; | |
3a039a31 | 1391 | }*/ |
41702fec | 1392 | return chi2track; |
eb38ed55 | 1393 | } |
1394 | ||
3b57a3f7 | 1395 | |
9e333711 | 1396 | //____________________________________________________________________ |
6e4d4425 | 1397 | Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
9e333711 | 1398 | { |
4d6aee34 | 1399 | // |
1400 | // Fit track with a staight line | |
1401 | // Fills an AliTrackPoint array with np points | |
1402 | // Function should be used to refit tracks when no magnetic field was on | |
1403 | // | |
9e333711 | 1404 | AliTRDLeastSquare yfitter, zfitter; |
4d6aee34 | 1405 | AliTRDcluster *cl = NULL; |
9e333711 | 1406 | |
4d6aee34 | 1407 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
9e333711 | 1408 | if(!tracklets){ |
1409 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1410 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1411 | if(!tracklet->IsOK()) continue; | |
1412 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1413 | } | |
1414 | tracklets = &work[0]; | |
1415 | } | |
1416 | ||
1417 | Double_t xref = CalculateReferenceX(tracklets); | |
1418 | Double_t x, y, z, dx, ye, yr, tilt; | |
1419 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1420 | if(!tracklets[ipl].IsOK()) continue; | |
1421 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1422 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1423 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1424 | x = cl->GetX(); | |
1425 | z = cl->GetZ(); | |
1426 | dx = x - xref; | |
1427 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1428 | } | |
1429 | } | |
1430 | zfitter.Eval(); | |
1431 | Double_t z0 = zfitter.GetFunctionParameter(0); | |
1432 | Double_t dzdx = zfitter.GetFunctionParameter(1); | |
1433 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1434 | if(!tracklets[ipl].IsOK()) continue; | |
1435 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1436 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1437 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1438 | x = cl->GetX(); | |
1439 | y = cl->GetY(); | |
1440 | z = cl->GetZ(); | |
1441 | tilt = tracklets[ipl].GetTilt(); | |
1442 | dx = x - xref; | |
1443 | yr = y + tilt*(z - z0 - dzdx*dx); | |
1444 | // error definition changes for the different calls | |
1445 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); | |
1446 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; | |
1447 | yfitter.AddPoint(&dx, yr, ye); | |
1448 | } | |
1449 | } | |
1450 | yfitter.Eval(); | |
1451 | Double_t y0 = yfitter.GetFunctionParameter(0); | |
1452 | Double_t dydx = yfitter.GetFunctionParameter(1); | |
1453 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); | |
1454 | ||
1455 | //update track points array | |
1456 | if(np && points){ | |
1457 | Float_t xyz[3]; | |
1458 | for(int ip=0; ip<np; ip++){ | |
1459 | points[ip].GetXYZ(xyz); | |
1460 | xyz[1] = y0 + dydx * (xyz[0] - xref); | |
1461 | xyz[2] = z0 + dzdx * (xyz[0] - xref); | |
1462 | points[ip].SetXYZ(xyz); | |
1463 | } | |
1464 | } | |
1465 | return chi2; | |
1466 | } | |
1467 | ||
1468 | ||
3b57a3f7 | 1469 | //_________________________________________________________________________ |
6e4d4425 | 1470 | Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
3b57a3f7 | 1471 | { |
0fa1a8ee | 1472 | // |
1473 | // Performs a Riemann fit taking tilting pad correction into account | |
1474 | // | |
1475 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1476 | // - Flag selecting the error definition | |
1477 | // Output: - Chi2 values of the track (in Parameter list) | |
1478 | // | |
1479 | // The equations which has to be solved simultaneously are: | |
1480 | // BEGIN_LATEX | |
1481 | // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2} | |
1482 | // y^{*} = y - tg(h)(z - z_{t}) | |
1483 | // z_{t} = z_{0}+dzdx*(x-x_{r}) | |
1484 | // END_LATEX | |
1485 | // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle, | |
1486 | // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the | |
1487 | // track in the x-z plane. Using the following transformations | |
1488 | // BEGIN_LATEX | |
1489 | // t = 1 / (x^{2} + y^{2}) | |
1490 | // u = 2 * x * t | |
1491 | // v = 2 * tan(h) * t | |
1492 | // w = 2 * tan(h) * (x - x_{r}) * t | |
1493 | // END_LATEX | |
1494 | // One gets the following linear equation | |
1495 | // BEGIN_LATEX | |
1496 | // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t | |
1497 | // END_LATEX | |
1498 | // where the coefficients have the following meaning | |
1499 | // BEGIN_LATEX | |
1500 | // a = -1/y_{0} | |
1501 | // b = x_{0}/y_{0} | |
1502 | // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0} | |
1503 | // d = z_{0} | |
1504 | // e = dz/dx | |
1505 | // END_LATEX | |
1506 | // The error calculation for the free term is thus | |
1507 | // BEGIN_LATEX | |
1508 | // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t | |
1509 | // END_LATEX | |
1510 | // | |
1511 | // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according | |
1512 | // to the formula: | |
1513 | // BEGIN_LATEX | |
1514 | // C = 1/R = a/(1 + b^{2} + c*a) | |
1515 | // END_LATEX | |
1516 | // | |
1517 | // Authors | |
1518 | // M.Ivanov <M.Ivanov@gsi.de> | |
1519 | // A.Bercuci <A.Bercuci@gsi.de> | |
1520 | // M.Fasel <M.Fasel@gsi.de> | |
1521 | ||
41702fec | 1522 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1523 | fitter->StoreData(kTRUE); | |
1524 | fitter->ClearPoints(); | |
1525 | AliTRDLeastSquare zfitter; | |
4d6aee34 | 1526 | AliTRDcluster *cl = NULL; |
3b57a3f7 | 1527 | |
4d6aee34 | 1528 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
3b57a3f7 | 1529 | if(!tracklets){ |
1530 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1531 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1532 | if(!tracklet->IsOK()) continue; | |
1533 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1534 | } | |
1535 | tracklets = &work[0]; | |
1536 | } | |
1537 | ||
41702fec | 1538 | Double_t xref = CalculateReferenceX(tracklets); |
352cef8f | 1539 | AliDebugGeneral("AliTRDtrackerV1::FitRiemanTilt()", 4, |
1540 | Form("\nx0[(0)%6.2f (1)%6.2f (2)%6.2f (3)%6.2f (4)%6.2f (5)%6.2f] xref[%6.2f]", tracklets[0].GetX0(), tracklets[1].GetX0(), tracklets[2].GetX0(), tracklets[3].GetX0(), tracklets[4].GetX0(), tracklets[5].GetX0(), xref)); | |
41702fec | 1541 | Double_t x, y, z, t, tilt, dx, w, we; |
1542 | Double_t uvt[4]; | |
1543 | Int_t nPoints = 0; | |
1544 | // Containers for Least-square fitter | |
1545 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1546 | if(!tracklets[ipl].IsOK()) continue; | |
8d2bec9e | 1547 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec | 1548 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
352cef8f | 1549 | //if (!tracklets[ipl].IsUsable(itb)) continue; |
41702fec | 1550 | x = cl->GetX(); |
1551 | y = cl->GetY(); | |
1552 | z = cl->GetZ(); | |
1553 | tilt = tracklets[ipl].GetTilt(); | |
1554 | dx = x - xref; | |
1555 | // Transformation | |
1556 | t = 1./(x*x + y*y); | |
1557 | uvt[0] = 2. * x * t; | |
1558 | uvt[1] = t; | |
1559 | uvt[2] = 2. * tilt * t; | |
1560 | uvt[3] = 2. * tilt * dx * t; | |
1561 | w = 2. * (y + tilt*z) * t; | |
1562 | // error definition changes for the different calls | |
1563 | we = 2. * t; | |
f29f13a6 | 1564 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec | 1565 | fitter->AddPoint(uvt, w, we); |
1566 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1567 | nPoints++; | |
1568 | } | |
1569 | } | |
aec26713 | 1570 | if(fitter->Eval()) return 1.E10; |
1571 | ||
41702fec | 1572 | Double_t z0 = fitter->GetParameter(3); |
1573 | Double_t dzdx = fitter->GetParameter(4); | |
3b57a3f7 | 1574 | |
1575 | ||
1576 | // Linear fitter - not possible to make boundaries | |
1577 | // Do not accept non possible z and dzdx combinations | |
1578 | Bool_t accept = kTRUE; | |
1579 | Double_t zref = 0.0; | |
1580 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1581 | if(!tracklets[iLayer].IsOK()) continue; | |
1582 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1583 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
3b57a3f7 | 1584 | accept = kFALSE; |
1585 | } | |
1586 | if (!accept) { | |
41702fec | 1587 | zfitter.Eval(); |
3b57a3f7 | 1588 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1589 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1590 | fitter->FixParameter(3, zmf); | |
1591 | fitter->FixParameter(4, dzmf); | |
e17f4785 | 1592 | fitter->Eval(); |
3b57a3f7 | 1593 | fitter->ReleaseParameter(3); |
1594 | fitter->ReleaseParameter(4); | |
1595 | z0 = fitter->GetParameter(3); // = zmf ? | |
1596 | dzdx = fitter->GetParameter(4); // = dzmf ? | |
1597 | } | |
1598 | ||
1599 | // Calculate Curvature | |
1600 | Double_t a = fitter->GetParameter(0); | |
1601 | Double_t b = fitter->GetParameter(1); | |
1602 | Double_t c = fitter->GetParameter(2); | |
1603 | Double_t y0 = 1. / a; | |
1604 | Double_t x0 = -b * y0; | |
a015e406 | 1605 | Double_t tmp = y0*y0 + x0*x0 - c*y0; |
1606 | if(tmp<=0.) return 1.E10; | |
4d6aee34 | 1607 | Double_t radius = TMath::Sqrt(tmp); |
1608 | Double_t curvature = 1.0 + b*b - c*a; | |
1609 | if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature); | |
3b57a3f7 | 1610 | |
1611 | // Calculate chi2 of the fit | |
1612 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); | |
352cef8f | 1613 | AliDebugGeneral("AliTRDtrackerV1::FitRiemanTilt()", 4, |
1614 | Form("x0[%6.2f] y0[%6.2f] R[%6.2f] chi2[%f]\n", x0, y0, radius, chi2)); | |
3b57a3f7 | 1615 | |
1616 | // Update the tracklets | |
1617 | if(!track){ | |
1618 | for(Int_t ip = 0; ip < kNPlanes; ip++) { | |
1619 | x = tracklets[ip].GetX0(); | |
4d6aee34 | 1620 | tmp = radius*radius-(x-x0)*(x-x0); |
a015e406 | 1621 | if(tmp <= 0.) continue; |
1622 | tmp = TMath::Sqrt(tmp); | |
3b57a3f7 | 1623 | |
1624 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
1625 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1626 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); | |
1627 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1628 | tracklets[ip].SetYref(1, (x - x0) / tmp); | |
1629 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); | |
1630 | tracklets[ip].SetZref(1, dzdx); | |
4d6aee34 | 1631 | tracklets[ip].SetC(curvature); |
3b57a3f7 | 1632 | tracklets[ip].SetChi2(chi2); |
1633 | } | |
1634 | } | |
3b57a3f7 | 1635 | //update track points array |
1636 | if(np && points){ | |
1637 | Float_t xyz[3]; | |
1638 | for(int ip=0; ip<np; ip++){ | |
1639 | points[ip].GetXYZ(xyz); | |
4d6aee34 | 1640 | xyz[1] = TMath::Abs(xyz[0] - x0) > radius ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((radius-(xyz[0]-x0))*(radius+(xyz[0]-x0))); |
3b57a3f7 | 1641 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1642 | points[ip].SetXYZ(xyz); | |
1643 | } | |
1644 | } | |
1645 | ||
3b57a3f7 | 1646 | return chi2; |
1647 | } | |
1648 | ||
1649 | ||
1bf51039 | 1650 | //____________________________________________________________________ |
e17f4785 | 1651 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points) |
1bf51039 | 1652 | { |
1653 | // Kalman filter implementation for the TRD. | |
1654 | // It returns the positions of the fit in the array "points" | |
1655 | // | |
1656 | // Author : A.Bercuci@gsi.de | |
1657 | ||
3cfaffa4 | 1658 | // printf("Start track @ x[%f]\n", track->GetX()); |
1bf51039 | 1659 | |
1660 | //prepare marker points along the track | |
1661 | Int_t ip = np ? 0 : 1; | |
1662 | while(ip<np){ | |
1663 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; | |
1664 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); | |
1665 | ip++; | |
1666 | } | |
1667 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); | |
1668 | ||
1669 | ||
4d6aee34 | 1670 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
1bf51039 | 1671 | |
1672 | //Loop through the TRD planes | |
1673 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { | |
1674 | // GET TRACKLET OR BUILT IT | |
1675 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; | |
1676 | if(tracklets){ | |
e17f4785 | 1677 | if(!(ptrTracklet = &tracklets[iplane])) continue; |
1bf51039 | 1678 | }else{ |
1679 | if(!(ptrTracklet = track->GetTracklet(iplane))){ | |
4d6aee34 | 1680 | /*AliTRDtrackerV1 *tracker = NULL; |
a2fbb6ec | 1681 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue; |
1bf51039 | 1682 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); |
1683 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ | |
1684 | continue; | |
1685 | } | |
1686 | } | |
1687 | if(!ptrTracklet->IsOK()) continue; | |
1688 | ||
1689 | Double_t x = ptrTracklet->GetX0(); | |
1690 | ||
1691 | while(ip < np){ | |
1692 | //don't do anything if next marker is after next update point. | |
1693 | if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break; | |
1bf51039 | 1694 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1695 | ||
1696 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1697 | track->GetXYZ(xyz); |
1698 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1699 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1700 | ip++; |
1701 | } | |
3cfaffa4 | 1702 | // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1bf51039 | 1703 | |
3cfaffa4 | 1704 | // Propagate closer to the next update point |
1bf51039 | 1705 | if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.; |
1706 | ||
1707 | if(!AdjustSector(track)) return -1; | |
1708 | if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1; | |
1709 | ||
1710 | //load tracklet to the tracker and the track | |
1711 | /* Int_t index; | |
1712 | if((index = FindTracklet(ptrTracklet)) < 0){ | |
1713 | ptrTracklet = SetTracklet(&tracklet); | |
1714 | index = fTracklets->GetEntriesFast()-1; | |
1715 | } | |
1716 | track->SetTracklet(ptrTracklet, index);*/ | |
1717 | ||
1718 | ||
1719 | // register tracklet to track with tracklet creation !! | |
1720 | // PropagateBack : loaded tracklet to the tracker and update index | |
1721 | // RefitInward : update index | |
1722 | // MakeTrack : loaded tracklet to the tracker and update index | |
1723 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); | |
1724 | ||
1725 | ||
1726 | //Calculate the mean material budget along the path inside the chamber | |
1727 | Double_t xyz0[3]; track->GetXYZ(xyz0); | |
1728 | Double_t alpha = track->GetAlpha(); | |
1729 | Double_t xyz1[3], y, z; | |
1730 | if(!track->GetProlongation(x, y, z)) return -1; | |
1731 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
1732 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
1733 | xyz1[2] = z; | |
fbe11be7 | 1734 | if(TMath::Abs(xyz0[0] - xyz1[0]) < 1e-3 && TMath::Abs(xyz0[1] - xyz1[1]) < 1e-3) continue; // check wheter we are at the same global x position |
1bf51039 | 1735 | Double_t param[7]; |
3cfaffa4 | 1736 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break; |
1bf51039 | 1737 | Double_t xrho = param[0]*param[4]; // density*length |
1738 | Double_t xx0 = param[1]; // radiation length | |
1739 | ||
1740 | //Propagate the track | |
1741 | track->PropagateTo(x, xx0, xrho); | |
1742 | if (!AdjustSector(track)) break; | |
1743 | ||
1744 | //Update track | |
b72f4eaf | 1745 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
1746 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; | |
1747 | Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov); | |
1748 | if(chi2<1e+10) track->Update(p, cov, chi2); | |
1bf51039 | 1749 | if(!up) continue; |
1750 | ||
1751 | //Reset material budget if 2 consecutive gold | |
1752 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); | |
1753 | } // end planes loop | |
1754 | ||
1755 | // extrapolation | |
1756 | while(ip < np){ | |
1757 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; | |
1758 | ||
1759 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1760 | track->GetXYZ(xyz); |
1761 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1762 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1763 | ip++; |
1764 | } | |
1765 | ||
1766 | return track->GetChi2(); | |
1767 | } | |
3b57a3f7 | 1768 | |
eb38ed55 | 1769 | //_________________________________________________________________________ |
bb56afff | 1770 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 | 1771 | { |
41702fec | 1772 | // |
1773 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. | |
1774 | // A linear dependence on the x-value serves as a model. | |
1775 | // The parameters are related to the tilted Riemann fit. | |
1776 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
1777 | // - the offset for the reference x | |
1778 | // - the slope | |
1779 | // - the reference x position | |
1780 | // Output: - The Chi2 value of the track in z-Direction | |
1781 | // | |
1782 | Float_t chi2Z = 0, nLayers = 0; | |
053767a4 | 1783 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec | 1784 | if(!tracklets[iLayer].IsOK()) continue; |
1785 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1786 | chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z); |
41702fec | 1787 | nLayers++; |
1788 | } | |
1789 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); | |
1790 | return chi2Z; | |
eb38ed55 | 1791 | } |
1792 | ||
bccda319 | 1793 | //_____________________________________________________________________________ |
1794 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) | |
1795 | { | |
41702fec | 1796 | // |
1797 | // Starting from current X-position of track <t> this function | |
1798 | // extrapolates the track up to radial position <xToGo>. | |
1799 | // Returns 1 if track reaches the plane, and 0 otherwise | |
1800 | // | |
bccda319 | 1801 | |
41702fec | 1802 | const Double_t kEpsilon = 0.00001; |
bccda319 | 1803 | |
41702fec | 1804 | // Current track X-position |
1805 | Double_t xpos = t.GetX(); | |
bccda319 | 1806 | |
41702fec | 1807 | // Direction: inward or outward |
1808 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; | |
bccda319 | 1809 | |
41702fec | 1810 | while (((xToGo - xpos) * dir) > kEpsilon) { |
bccda319 | 1811 | |
41702fec | 1812 | Double_t xyz0[3]; |
1813 | Double_t xyz1[3]; | |
1814 | Double_t param[7]; | |
1815 | Double_t x; | |
1816 | Double_t y; | |
1817 | Double_t z; | |
bccda319 | 1818 | |
41702fec | 1819 | // The next step size |
1820 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); | |
bccda319 | 1821 | |
41702fec | 1822 | // Get the global position of the starting point |
1823 | t.GetXYZ(xyz0); | |
bccda319 | 1824 | |
41702fec | 1825 | // X-position after next step |
1826 | x = xpos + step; | |
bccda319 | 1827 | |
41702fec | 1828 | // Get local Y and Z at the X-position of the next step |
3352b455 | 1829 | if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible |
bccda319 | 1830 | |
41702fec | 1831 | // The global position of the end point of this prolongation step |
1832 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); | |
1833 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); | |
1834 | xyz1[2] = z; | |
bccda319 | 1835 | |
41702fec | 1836 | // Calculate the mean material budget between start and |
1837 | // end point of this prolongation step | |
83dea92e | 1838 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0; |
bccda319 | 1839 | |
41702fec | 1840 | // Propagate the track to the X-position after the next step |
9c87a076 | 1841 | if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0; |
bccda319 | 1842 | |
41702fec | 1843 | // Rotate the track if necessary |
1844 | AdjustSector(&t); | |
bccda319 | 1845 | |
41702fec | 1846 | // New track X-position |
1847 | xpos = t.GetX(); | |
bccda319 | 1848 | |
41702fec | 1849 | } |
bccda319 | 1850 | |
41702fec | 1851 | return 1; |
bccda319 | 1852 | |
1853 | } | |
1854 | ||
eb38ed55 | 1855 | |
1856 | //_____________________________________________________________________________ | |
1857 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const | |
1858 | { | |
41702fec | 1859 | // |
1860 | // Reads AliTRDclusters from the file. | |
1861 | // The names of the cluster tree and branches | |
1862 | // should match the ones used in AliTRDclusterizer::WriteClusters() | |
1863 | // | |
1864 | ||
1865 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); | |
1866 | TObjArray *clusterArray = new TObjArray(nsize+1000); | |
1867 | ||
1868 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); | |
1869 | if (!branch) { | |
1870 | AliError("Can't get the branch !"); | |
1871 | return 1; | |
1872 | } | |
1873 | branch->SetAddress(&clusterArray); | |
1874 | ||
1875 | if(!fClusters){ | |
9e85cb05 | 1876 | Float_t nclusters = fkRecoParam->GetNClusters(); |
4d6aee34 | 1877 | if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector; |
8ae98148 | 1878 | array = new TClonesArray("AliTRDcluster", Int_t(nclusters)); |
41702fec | 1879 | array->SetOwner(kTRUE); |
1880 | } | |
1881 | ||
1882 | // Loop through all entries in the tree | |
1883 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); | |
1884 | Int_t nbytes = 0; | |
1885 | Int_t ncl = 0; | |
4d6aee34 | 1886 | AliTRDcluster *c = NULL; |
41702fec | 1887 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { |
1888 | // Import the tree | |
1889 | nbytes += clusterTree->GetEvent(iEntry); | |
1890 | ||
1891 | // Get the number of points in the detector | |
1892 | Int_t nCluster = clusterArray->GetEntriesFast(); | |
1893 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { | |
1894 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; | |
41702fec | 1895 | new((*fClusters)[ncl++]) AliTRDcluster(*c); |
1896 | delete (clusterArray->RemoveAt(iCluster)); | |
1897 | } | |
1898 | ||
1899 | } | |
1900 | delete clusterArray; | |
1901 | ||
1902 | return 0; | |
eb38ed55 | 1903 | } |
1904 | ||
1905 | //_____________________________________________________________________________ | |
1906 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) | |
1907 | { | |
41702fec | 1908 | // |
66f6bfd9 | 1909 | // Fills clusters into TRD tracking sectors |
41702fec | 1910 | // |
41702fec | 1911 | |
9e85cb05 | 1912 | fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event |
1913 | ||
4d6aee34 | 1914 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 | 1915 | fClusters = AliTRDReconstructor::GetClusters(); |
1916 | } else { | |
66f6bfd9 | 1917 | if (ReadClusters(fClusters, cTree)) { |
1918 | AliError("Problem with reading the clusters !"); | |
1919 | return 1; | |
1920 | } | |
1921 | } | |
1922 | SetClustersOwner(); | |
1923 | ||
48f8adf3 | 1924 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 | 1925 | AliInfo("No TRD clusters"); |
41702fec | 1926 | return 1; |
1927 | } | |
66f6bfd9 | 1928 | |
1929 | //Int_t nin = | |
1930 | BuildTrackingContainers(); | |
1931 | ||
1932 | //Int_t ncl = fClusters->GetEntriesFast(); | |
1933 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
1934 | ||
1935 | return 0; | |
1936 | } | |
1937 | ||
1938 | //_____________________________________________________________________________ | |
4d6aee34 | 1939 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters) |
66f6bfd9 | 1940 | { |
1941 | // | |
1942 | // Fills clusters into TRD tracking sectors | |
1943 | // Function for use in the HLT | |
1944 | ||
1945 | if(!clusters || !clusters->GetEntriesFast()){ | |
1946 | AliInfo("No TRD clusters"); | |
41702fec | 1947 | return 1; |
1948 | } | |
1949 | ||
66f6bfd9 | 1950 | fClusters = clusters; |
1951 | SetClustersOwner(); | |
1952 | ||
9e85cb05 | 1953 | fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event |
66f6bfd9 | 1954 | BuildTrackingContainers(); |
1955 | ||
1956 | //Int_t ncl = fClusters->GetEntriesFast(); | |
1957 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
1958 | ||
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | ||
1963 | //____________________________________________________________________ | |
1964 | Int_t AliTRDtrackerV1::BuildTrackingContainers() | |
1965 | { | |
1966 | // Building tracking containers for clusters | |
1967 | ||
1968 | Int_t nin =0, icl = fClusters->GetEntriesFast(); | |
41702fec | 1969 | while (icl--) { |
1970 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); | |
1971 | if(c->IsInChamber()) nin++; | |
4226b195 | 1972 | if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG); |
41702fec | 1973 | Int_t detector = c->GetDetector(); |
1974 | Int_t sector = fGeom->GetSector(detector); | |
053767a4 | 1975 | Int_t stack = fGeom->GetStack(detector); |
1976 | Int_t layer = fGeom->GetLayer(detector); | |
41702fec | 1977 | |
053767a4 | 1978 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl); |
41702fec | 1979 | } |
b0a48c4d | 1980 | |
1981 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); | |
053767a4 | 1982 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec | 1983 | if(!fTrSec[isector].GetNChambers()) continue; |
4d6aee34 | 1984 | fTrSec[isector].Init(fkReconstructor, cal); |
41702fec | 1985 | } |
66f6bfd9 | 1986 | |
1987 | return nin; | |
eb38ed55 | 1988 | } |
1989 | ||
1990 | ||
66f6bfd9 | 1991 | |
0906e73e | 1992 | //____________________________________________________________________ |
172b6f82 | 1993 | void AliTRDtrackerV1::UnloadClusters() |
0906e73e | 1994 | { |
d4cf71ca | 1995 | // |
1996 | // Clears the arrays of clusters and tracks. Resets sectors and timebins | |
1997 | // If option "force" is also set the containers are also deleted. This is useful | |
1998 | // in case of HLT | |
1999 | ||
2000 | if(fTracks){ | |
2001 | fTracks->Delete(); | |
4d6aee34 | 2002 | if(HasRemoveContainers()){delete fTracks; fTracks = NULL;} |
d4cf71ca | 2003 | } |
2004 | if(fTracklets){ | |
2005 | fTracklets->Delete(); | |
4d6aee34 | 2006 | if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;} |
d4cf71ca | 2007 | } |
48f8adf3 | 2008 | if(fClusters){ |
2009 | if(IsClustersOwner()) fClusters->Delete(); | |
2010 | ||
2011 | // save clusters array in the reconstructor for further use. | |
4d6aee34 | 2012 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 | 2013 | AliTRDReconstructor::SetClusters(fClusters); |
2014 | SetClustersOwner(kFALSE); | |
4d6aee34 | 2015 | } else AliTRDReconstructor::SetClusters(NULL); |
48f8adf3 | 2016 | } |
0906e73e | 2017 | |
053767a4 | 2018 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e | 2019 | |
41702fec | 2020 | // Increment the Event Number |
2021 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); | |
eb38ed55 | 2022 | } |
0906e73e | 2023 | |
fac58f00 | 2024 | // //____________________________________________________________________ |
2025 | // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const | |
2026 | // { | |
2027 | // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t); | |
2028 | // if(!track) return; | |
2029 | // | |
4d6aee34 | 2030 | // AliTRDseedV1 *tracklet = NULL; |
fac58f00 | 2031 | // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){ |
2032 | // if(!(tracklet = track->GetTracklet(ily))) continue; | |
4d6aee34 | 2033 | // AliTRDcluster *c = NULL; |
8d2bec9e | 2034 | // for(Int_t ic=AliTRDseed::kNclusters; ic--;){ |
fac58f00 | 2035 | // if(!(c=tracklet->GetClusters(ic))) continue; |
2036 | // c->Use(); | |
2037 | // } | |
2038 | // } | |
2039 | // } | |
2040 | // | |
b1957d3c | 2041 | |
eb38ed55 | 2042 | //_____________________________________________________________________________ |
4d6aee34 | 2043 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track) |
eb38ed55 | 2044 | { |
41702fec | 2045 | // |
2046 | // Rotates the track when necessary | |
2047 | // | |
2048 | ||
2049 | Double_t alpha = AliTRDgeometry::GetAlpha(); | |
2050 | Double_t y = track->GetY(); | |
2051 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); | |
3cfaffa4 | 2052 | |
41702fec | 2053 | if (y > ymax) { |
2054 | if (!track->Rotate( alpha)) { | |
2055 | return kFALSE; | |
2056 | } | |
2057 | } | |
2058 | else if (y < -ymax) { | |
2059 | if (!track->Rotate(-alpha)) { | |
2060 | return kFALSE; | |
2061 | } | |
2062 | } | |
2063 | ||
2064 | return kTRUE; | |
0906e73e | 2065 | |
2066 | } | |
2067 | ||
eb38ed55 | 2068 | |
0906e73e | 2069 | //____________________________________________________________________ |
4d6aee34 | 2070 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx) |
0906e73e | 2071 | { |
41702fec | 2072 | // Find tracklet for TRD track <track> |
2073 | // Parameters | |
2074 | // - track | |
2075 | // - sector | |
2076 | // - plane | |
2077 | // - index | |
2078 | // Output | |
2079 | // tracklet | |
2080 | // index | |
2081 | // Detailed description | |
2082 | // | |
2083 | idx = track->GetTrackletIndex(p); | |
17896e82 | 2084 | AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
41702fec | 2085 | |
2086 | return tracklet; | |
0906e73e | 2087 | } |
2088 | ||
2089 | //____________________________________________________________________ | |
4d6aee34 | 2090 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet) |
0906e73e | 2091 | { |
41702fec | 2092 | // Add this tracklet to the list of tracklets stored in the tracker |
2093 | // | |
2094 | // Parameters | |
2095 | // - tracklet : pointer to the tracklet to be added to the list | |
2096 | // | |
2097 | // Output | |
2098 | // - the index of the new tracklet in the tracker tracklets list | |
2099 | // | |
2100 | // Detailed description | |
2101 | // Build the tracklets list if it is not yet created (late initialization) | |
2102 | // and adds the new tracklet to the list. | |
2103 | // | |
2104 | if(!fTracklets){ | |
053767a4 | 2105 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec | 2106 | fTracklets->SetOwner(kTRUE); |
2107 | } | |
2108 | Int_t nentries = fTracklets->GetEntriesFast(); | |
2109 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); | |
972ef65e | 2110 | } |
2111 | ||
d20df6fc | 2112 | //____________________________________________________________________ |
4d6aee34 | 2113 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track) |
d20df6fc | 2114 | { |
2115 | // Add this track to the list of tracks stored in the tracker | |
2116 | // | |
2117 | // Parameters | |
2118 | // - track : pointer to the track to be added to the list | |
2119 | // | |
2120 | // Output | |
2121 | // - the pointer added | |
2122 | // | |
2123 | // Detailed description | |
2124 | // Build the tracks list if it is not yet created (late initialization) | |
2125 | // and adds the new track to the list. | |
2126 | // | |
2127 | if(!fTracks){ | |
053767a4 | 2128 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc | 2129 | fTracks->SetOwner(kTRUE); |
2130 | } | |
2131 | Int_t nentries = fTracks->GetEntriesFast(); | |
2132 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); | |
2133 | } | |
2134 | ||
2135 | ||
0906e73e | 2136 | |
e4f2f73d | 2137 | //____________________________________________________________________ |
eb38ed55 | 2138 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d | 2139 | { |
41702fec | 2140 | // |
2141 | // Steer tracking for one SM. | |
2142 | // | |
2143 | // Parameters : | |
2144 | // sector : Array of (SM) propagation layers containing clusters | |
2145 | // esd : The current ESD event. On output it contains the also | |
2146 | // the ESD (TRD) tracks found in this SM. | |
2147 | // | |
2148 | // Output : | |
2149 | // Number of tracks found in this TRD supermodule. | |
2150 | // | |
2151 | // Detailed description | |
2152 | // | |
2153 | // 1. Unpack AliTRDpropagationLayers objects for each stack. | |
2154 | // 2. Launch stack tracking. | |
2155 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. | |
2156 | // 3. Pack results in the ESD event. | |
2157 | // | |
2158 | ||
41702fec | 2159 | Int_t nTracks = 0; |
2160 | Int_t nChambers = 0; | |
4d6aee34 | 2161 | AliTRDtrackingChamber **stack = NULL, *chamber = NULL; |
053767a4 | 2162 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec | 2163 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
2164 | nChambers = 0; | |
053767a4 | 2165 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
2166 | if(!(chamber = stack[ilayer])) continue; | |
9e85cb05 | 2167 | if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue; |
41702fec | 2168 | nChambers++; |
053767a4 | 2169 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec | 2170 | } |
2171 | if(nChambers < 4) continue; | |
2172 | //AliInfo(Form("Doing stack %d", istack)); | |
b1135f96 | 2173 | nTracks += Clusters2TracksStack(stack, fTracksESD); |
41702fec | 2174 | } |
050875b0 | 2175 | if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks)); |
2176 | ||
352cef8f | 2177 | for(int itrack=0; itrack<nTracks; itrack++){ |
2178 | AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack))); | |
2179 | Int_t id = esd->AddTrack(esdTrack); | |
2180 | ||
2181 | // set ESD id to stand alone TRD tracks | |
9e85cb05 | 2182 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
352cef8f | 2183 | esdTrack=esd->GetTrack(id); |
2184 | TObject *o(NULL); Int_t ic(0); | |
2185 | AliTRDtrackV1 *calibTrack(NULL); | |
2186 | while((o = esdTrack->GetCalibObject(ic++))){ | |
2187 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; | |
2188 | calibTrack->SetESDid(esdTrack->GetID()); | |
2189 | break; | |
2190 | } | |
2191 | } | |
2192 | } | |
41702fec | 2193 | |
2194 | // Reset Track and Candidate Number | |
2195 | AliTRDtrackerDebug::SetCandidateNumber(0); | |
2196 | AliTRDtrackerDebug::SetTrackNumber(0); | |
b1135f96 | 2197 | |
2198 | // delete ESD tracks in the array | |
2199 | fTracksESD->Delete(); | |
41702fec | 2200 | return nTracks; |
e4f2f73d | 2201 | } |
2202 | ||
2203 | //____________________________________________________________________ | |
4d6aee34 | 2204 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList) |
e4f2f73d | 2205 | { |
41702fec | 2206 | // |
2207 | // Make tracks in one TRD stack. | |
2208 | // | |
2209 | // Parameters : | |
2210 | // layer : Array of stack propagation layers containing clusters | |
2211 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. | |
2212 | // On exit the tracks found in this stack are appended. | |
2213 | // | |
2214 | // Output : | |
2215 | // Number of tracks found in this stack. | |
2216 | // | |
2217 | // Detailed description | |
2218 | // | |
2219 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. | |
2220 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. | |
2221 | // See AliTRDtrackerV1::MakeSeeds() for more details. | |
2222 | // 3. Arrange track candidates in decreasing order of their quality | |
2223 | // 4. Classify tracks in 5 categories according to: | |
2224 | // a) number of layers crossed | |
2225 | // b) track quality | |
2226 | // 5. Sign clusters by tracks in decreasing order of track quality | |
2227 | // 6. Build AliTRDtrack out of seeding tracklets | |
2228 | // 7. Cook MC label | |
2229 | // 8. Build ESD track and register it to the output list | |
2230 | // | |
2231 | ||
b0a48c4d | 2232 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
4d6aee34 | 2233 | AliTRDtrackingChamber *chamber = NULL; |
2234 | AliTRDtrackingChamber **ci = NULL; | |
41702fec | 2235 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
2236 | Int_t pars[4]; // MakeSeeds parameters | |
2237 | ||
2238 | //Double_t alpha = AliTRDgeometry::GetAlpha(); | |
2239 | //Double_t shift = .5 * alpha; | |
2240 | Int_t configs[kNConfigs]; | |
2241 | ||
fac58f00 | 2242 | // Purge used clusters from the containers |
2243 | ci = &stack[0]; | |
2244 | for(Int_t ic = kNPlanes; ic--; ci++){ | |
2245 | if(!(*ci)) continue; | |
2246 | (*ci)->Update(); | |
2247 | } | |
2248 | ||
41702fec | 2249 | // Build initial seeding configurations |
2250 | Double_t quality = BuildSeedingConfigs(stack, configs); | |
9e85cb05 | 2251 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){ |
41702fec | 2252 | AliInfo(Form("Plane config %d %d %d Quality %f" |
2253 | , configs[0], configs[1], configs[2], quality)); | |
2254 | } | |
d931f2aa | 2255 | |
41702fec | 2256 | |
2257 | // Initialize contors | |
2258 | Int_t ntracks, // number of TRD track candidates | |
2259 | ntracks1, // number of registered TRD tracks/iter | |
2260 | ntracks2 = 0; // number of all registered TRD tracks in stack | |
2261 | fSieveSeeding = 0; | |
d931f2aa | 2262 | |
2263 | // Get stack index | |
fac58f00 | 2264 | Int_t ic = 0; ci = &stack[0]; |
2265 | while(ic<kNPlanes && !(*ci)){ic++; ci++;} | |
2266 | if(!(*ci)) return ntracks2; | |
2267 | Int_t istack = fGeom->GetStack((*ci)->GetDetector()); | |
d931f2aa | 2268 | |
41702fec | 2269 | do{ |
2270 | // Loop over seeding configurations | |
2271 | ntracks = 0; ntracks1 = 0; | |
2272 | for (Int_t iconf = 0; iconf<3; iconf++) { | |
2273 | pars[0] = configs[iconf]; | |
2274 | pars[1] = ntracks; | |
d931f2aa | 2275 | pars[2] = istack; |
41702fec | 2276 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
6e39bde4 | 2277 | //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks)); |
41702fec | 2278 | if(ntracks == kMaxTracksStack) break; |
2279 | } | |
980d5a2a | 2280 | AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec | 2281 | |
2282 | if(!ntracks) break; | |
2283 | ||
2284 | // Sort the seeds according to their quality | |
2285 | Int_t sort[kMaxTracksStack]; | |
2286 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); | |
2287 | ||
2288 | // Initialize number of tracks so far and logic switches | |
2289 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); | |
2290 | Bool_t signedTrack[kMaxTracksStack]; | |
2291 | Bool_t fakeTrack[kMaxTracksStack]; | |
2292 | for (Int_t i=0; i<ntracks; i++){ | |
2293 | signedTrack[i] = kFALSE; | |
2294 | fakeTrack[i] = kFALSE; | |
2295 | } | |
2296 | //AliInfo("Selecting track candidates ..."); | |
2297 | ||
2298 | // Sieve clusters in decreasing order of track quality | |
2299 | Double_t trackParams[7]; | |
4d6aee34 | 2300 | // AliTRDseedV1 *lseed = NULL; |
41702fec | 2301 | Int_t jSieve = 0, candidates; |
2302 | do{ | |
2303 | //AliInfo(Form("\t\tITER = %i ", jSieve)); | |
2304 | ||
2305 | // Check track candidates | |
2306 | candidates = 0; | |
2307 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { | |
804bb02e | 2308 | Int_t trackIndex = sort[itrack]; |
2309 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; | |
41702fec | 2310 | |
2311 | ||
804bb02e | 2312 | // Calculate track parameters from tracklets seeds |
804bb02e | 2313 | Int_t ncl = 0; |
2314 | Int_t nused = 0; | |
2315 | Int_t nlayers = 0; | |
2316 | Int_t findable = 0; | |
2317 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { | |
2318 | Int_t jseed = kNPlanes*trackIndex+jLayer; | |
2319 | if(!sseed[jseed].IsOK()) continue; | |
f29f13a6 | 2320 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++; |
eede7907 | 2321 | // TODO here we get a sig fault which should never happen ! |
804bb02e | 2322 | sseed[jseed].UpdateUsed(); |
2323 | ncl += sseed[jseed].GetN2(); | |
2324 | nused += sseed[jseed].GetNUsed(); | |
2325 | nlayers++; | |
804bb02e | 2326 | } |
2327 | ||
f29f13a6 | 2328 | // Filter duplicated tracks |
2329 | if (nused > 30){ | |
2330 | //printf("Skip %d nused %d\n", trackIndex, nused); | |
2331 | fakeTrack[trackIndex] = kTRUE; | |
2332 | continue; | |
2333 | } | |
5ef88e00 | 2334 | if (ncl>0 && Float_t(nused)/ncl >= .25){ |
f29f13a6 | 2335 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); |
2336 | fakeTrack[trackIndex] = kTRUE; | |
2337 | continue; | |
2338 | } | |
41702fec | 2339 | |
f29f13a6 | 2340 | // Classify tracks |
2341 | Bool_t skip = kFALSE; | |
2342 | switch(jSieve){ | |
2343 | case 0: | |
2344 | if(nlayers < 6) {skip = kTRUE; break;} | |
2345 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
2346 | break; | |
2347 | ||
2348 | case 1: | |
2349 | if(nlayers < findable){skip = kTRUE; break;} | |
2350 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} | |
2351 | break; | |
2352 | ||
2353 | case 2: | |
2354 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} | |
2355 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} | |
2356 | break; | |
2357 | ||
2358 | case 3: | |
2359 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
2360 | break; | |
2361 | ||
2362 | case 4: | |
2363 | if (nlayers == 3){skip = kTRUE; break;} | |
2364 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} | |
2365 | break; | |
2366 | } | |
2367 | if(skip){ | |
2368 | candidates++; | |
5ef88e00 | 2369 | AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused)); |
f29f13a6 | 2370 | continue; |
5ef88e00 | 2371 | } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused)); |
2372 | ||
f29f13a6 | 2373 | signedTrack[trackIndex] = kTRUE; |
2374 | ||
2375 | // Build track parameters | |
2376 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; | |
2377 | /* Int_t idx = 0; | |
2378 | while(idx<3 && !lseed->IsOK()) { | |
2379 | idx++; | |
2380 | lseed++; | |
2381 | }*/ | |
2382 | Double_t x = lseed->GetX0();// - 3.5; | |
2383 | trackParams[0] = x; //NEW AB | |
2384 | trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x); | |
2385 | trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x); | |
2386 | trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1))); | |
2387 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); | |
2388 | trackParams[5] = lseed->GetC(); | |
2389 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; | |
2390 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ | |
2391 | ||
9e85cb05 | 2392 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){ |
eb2b4f91 | 2393 | //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); |
f29f13a6 | 2394 | |
f29f13a6 | 2395 | AliTRDseedV1 *dseed[6]; |
b82b4de1 | 2396 | for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]); |
f29f13a6 | 2397 | |
2398 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); | |
f29f13a6 | 2399 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2400 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); | |
2401 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
a2fbb6ec | 2402 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
f29f13a6 | 2403 | cstreamer << "Clusters2TracksStack" |
2404 | << "EventNumber=" << eventNumber | |
2405 | << "TrackNumber=" << trackNumber | |
2406 | << "CandidateNumber=" << candidateNumber | |
2407 | << "Iter=" << fSieveSeeding | |
2408 | << "Like=" << fTrackQuality[trackIndex] | |
2409 | << "S0.=" << dseed[0] | |
2410 | << "S1.=" << dseed[1] | |
2411 | << "S2.=" << dseed[2] | |
2412 | << "S3.=" << dseed[3] | |
2413 | << "S4.=" << dseed[4] | |
2414 | << "S5.=" << dseed[5] | |
2415 | << "p0=" << trackParams[0] | |
2416 | << "p1=" << trackParams[1] | |
2417 | << "p2=" << trackParams[2] | |
2418 | << "p3=" << trackParams[3] | |
2419 | << "p4=" << trackParams[4] | |
2420 | << "p5=" << trackParams[5] | |
2421 | << "p6=" << trackParams[6] | |
f29f13a6 | 2422 | << "Ncl=" << ncl |
2423 | << "NLayers=" << nlayers | |
2424 | << "Findable=" << findable | |
2425 | << "NUsed=" << nused | |
2426 | << "\n"; | |
2427 | } | |
d877f55f | 2428 | |
f29f13a6 | 2429 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
2430 | if(!track){ | |
980d5a2a | 2431 | AliDebug(1, "Track building failed."); |
f29f13a6 | 2432 | continue; |
d877f55f | 2433 | } |
41702fec | 2434 | |
f29f13a6 | 2435 | //AliInfo("End of MakeTrack()"); |
2436 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); | |
2437 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); | |
2438 | esdTrack->SetLabel(track->GetLabel()); | |
2439 | track->UpdateESDtrack(esdTrack); | |
2440 | // write ESD-friends if neccessary | |
9e85cb05 | 2441 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
f29f13a6 | 2442 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); |
2443 | calibTrack->SetOwner(); | |
2444 | esdTrack->AddCalibObject(calibTrack); | |
2445 | } | |
2446 | ntracks1++; | |
2447 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); | |
41702fec | 2448 | } |
2449 | ||
2450 | jSieve++; | |
2451 | } while(jSieve<5 && candidates); // end track candidates sieve | |
2452 | if(!ntracks1) break; | |
2453 | ||
2454 | // increment counters | |
2455 | ntracks2 += ntracks1; | |
4302c900 | 2456 | |
4d6aee34 | 2457 | if(fkReconstructor->IsHLT()) break; |
41702fec | 2458 | fSieveSeeding++; |
2459 | ||
2460 | // Rebuild plane configurations and indices taking only unused clusters into account | |
2461 | quality = BuildSeedingConfigs(stack, configs); | |
4d6aee34 | 2462 | if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec | 2463 | |
2464 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
2465 | if(!(chamber = stack[ip])) continue; | |
b0a48c4d | 2466 | chamber->Build(fGeom, cal);//Indices(fSieveSeeding); |
41702fec | 2467 | } |
2468 | ||
9e85cb05 | 2469 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){ |
41702fec | 2470 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2471 | } | |
2472 | } while(fSieveSeeding<10); // end stack clusters sieve | |
2473 | ||
2474 | ||
2475 | ||
2476 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); | |
2477 | ||
2478 | return ntracks2; | |
e4f2f73d | 2479 | } |
2480 | ||
2481 | //___________________________________________________________________ | |
eb38ed55 | 2482 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d | 2483 | { |
41702fec | 2484 | // |
2485 | // Assign probabilities to chambers according to their | |
2486 | // capability of producing seeds. | |
2487 | // | |
2488 | // Parameters : | |
2489 | // | |
2490 | // layers : Array of stack propagation layers for all 6 chambers in one stack | |
2491 | // configs : On exit array of configuration indexes (see GetSeedingConfig() | |
2492 | // for details) in the decreasing order of their seeding probabilities. | |
2493 | // | |
2494 | // Output : | |
2495 | // | |
2496 | // Return top configuration quality | |
2497 | // | |
2498 | // Detailed description: | |
2499 | // | |
2500 | // To each chamber seeding configuration (see GetSeedingConfig() for | |
2501 | // the list of all configurations) one defines 2 quality factors: | |
2502 | // - an apriori topological quality (see GetSeedingConfig() for details) and | |
2503 | // - a data quality based on the uniformity of the distribution of | |
2504 | // clusters over the x range (time bins population). See CookChamberQA() for details. | |
2505 | // The overall chamber quality is given by the product of this 2 contributions. | |
2506 | // | |
2507 | ||
eb2b4f91 | 2508 | Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t)); |
4d6aee34 | 2509 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 2510 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2511 | if(!(chamber = stack[iplane])) continue; | |
2512 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; | |
2513 | } | |
2514 | ||
eb2b4f91 | 2515 | Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t)); |
2516 | Int_t planes[] = {0, 0, 0, 0}; | |
41702fec | 2517 | for(int iconf=0; iconf<kNConfigs; iconf++){ |
2518 | GetSeedingConfig(iconf, planes); | |
2519 | tconfig[iconf] = fgTopologicQA[iconf]; | |
2520 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; | |
2521 | } | |
2522 | ||
2523 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); | |
2524 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); | |
2525 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); | |
2526 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); | |
2527 | ||
2528 | return tconfig[configs[0]]; | |
e4f2f73d | 2529 | } |
2530 | ||
2531 | //____________________________________________________________________ | |
e17f4785 | 2532 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar) |
e4f2f73d | 2533 | { |
afa21247 | 2534 | // |
2a3191bb | 2535 | // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are |
2536 | // either missed by TPC prolongation or conversions inside the TRD volume. | |
2537 | // For stand alone tracking the procedure is used to estimate all tracks measured by TRD. | |
afa21247 | 2538 | // |
2539 | // Parameters : | |
2540 | // layers : Array of stack propagation layers containing clusters | |
2541 | // sseed : Array of empty tracklet seeds. On exit they are filled. | |
2542 | // ipar : Control parameters: | |
2543 | // ipar[0] -> seeding chambers configuration | |
2544 | // ipar[1] -> stack index | |
2545 | // ipar[2] -> number of track candidates found so far | |
2546 | // | |
2547 | // Output : | |
2548 | // Number of tracks candidates found. | |
2549 | // | |
2550 | // The following steps are performed: | |
2551 | // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the | |
2552 | // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding | |
2553 | // is described in AliTRDtrackerV1::Clusters2TracksStack(). | |
2554 | // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm: | |
2555 | // - for each seeding cluster in the lower seeding layer find | |
2556 | // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle | |
2557 | // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker. | |
2558 | // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the | |
2559 | // reco params | |
2560 | // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three | |
2561 | // seeding clusters. | |
2562 | // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond() | |
2563 | // and AliTRDchamberTimeBin::GetClusters(). | |
2564 | // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is | |
2565 | // performed at this level | |
2566 | // 4. Initialize seeding tracklets in the seeding chambers. | |
2567 | // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params. | |
2568 | // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see | |
2569 | // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25). | |
2570 | // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed. | |
2571 | // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new | |
2572 | // approximation of the track. | |
2573 | // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are | |
2574 | // checked against the Riemann fit: | |
2575 | // - position resolution in y | |
2576 | // - angular resolution in the bending plane | |
2577 | // - likelihood of the number of clusters attached to the tracklet | |
2578 | // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers: | |
2579 | // - Initialization of extrapolation tracklets with the fit parameters | |
2580 | // - Attach clusters to extrapolated tracklets | |
2581 | // - Helix fit of tracklets | |
2582 | // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track | |
2583 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. | |
2584 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation | |
2585 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. | |
2586 | // 14. Cooking labels for tracklets. Should be done only for MC | |
2587 | // 15. Register seeds. | |
2588 | // | |
2589 | // Authors: | |
2590 | // Marian Ivanov <M.Ivanov@gsi.de> | |
2591 | // Alexandru Bercuci <A.Bercuci@gsi.de> | |
2592 | // Markus Fasel <M.Fasel@gsi.de> | |
41702fec | 2593 | |
4d6aee34 | 2594 | AliTRDtrackingChamber *chamber = NULL; |
2595 | AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters | |
e17f4785 | 2596 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track |
41702fec | 2597 | Int_t ncl, mcl; // working variable for looping over clusters |
2598 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; | |
2599 | // chi2 storage | |
2600 | // chi2[0] = tracklet chi2 on the Z direction | |
2601 | // chi2[1] = tracklet chi2 on the R direction | |
2602 | Double_t chi2[4]; | |
2603 | ||
afa21247 | 2604 | // this should be data member of AliTRDtrack TODO |
41702fec | 2605 | Double_t seedQuality[kMaxTracksStack]; |
2606 | ||
2607 | // unpack control parameters | |
2608 | Int_t config = ipar[0]; | |
2609 | Int_t ntracks = ipar[1]; | |
d931f2aa | 2610 | Int_t istack = ipar[2]; |
41702fec | 2611 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
afa21247 | 2612 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
be24510a | 2613 | |
2614 | ||
41702fec | 2615 | // Init chambers geometry |
41702fec | 2616 | Double_t hL[kNPlanes]; // Tilting angle |
2617 | Float_t padlength[kNPlanes]; // pad lenghts | |
dd8059a8 | 2618 | Float_t padwidth[kNPlanes]; // pad widths |
4d6aee34 | 2619 | AliTRDpadPlane *pp = NULL; |
41702fec | 2620 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2621 | pp = fGeom->GetPadPlane(iplane, istack); | |
bb79ccd5 | 2622 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec | 2623 | padlength[iplane] = pp->GetLengthIPad(); |
dd8059a8 | 2624 | padwidth[iplane] = pp->GetWidthIPad(); |
41702fec | 2625 | } |
2626 | ||
eb2b4f91 | 2627 | // Init anode wire position for chambers |
e165b64b | 2628 | Double_t x0[kNPlanes], // anode wire position |
eb2b4f91 | 2629 | driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length |
4d6aee34 | 2630 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 2631 | Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.}; |
2632 | Double_t glb[] = {0., 0., 0.}; | |
2633 | AliTRDtrackingChamber **cIter = &stack[0]; | |
a3743898 | 2634 | for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){ |
eb2b4f91 | 2635 | if(!(*cIter)) continue; |
e165b64b | 2636 | if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){ |
2637 | continue; | |
2638 | x0[iLayer] = fgkX0[iLayer]; | |
2639 | } | |
eb2b4f91 | 2640 | matrix->LocalToMaster(loc, glb); |
2641 | x0[iLayer] = glb[0]; | |
2642 | } | |
2643 | ||
980d5a2a | 2644 | AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
41702fec | 2645 | |
d931f2aa | 2646 | // Build seeding layers |
d611c74f | 2647 | ResetSeedTB(); |
41702fec | 2648 | Int_t nlayers = 0; |
41702fec | 2649 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2650 | if(!(chamber = stack[planes[isl]])) continue; | |
4d6aee34 | 2651 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue; |
41702fec | 2652 | nlayers++; |
41702fec | 2653 | } |
eb2b4f91 | 2654 | if(nlayers < kNSeedPlanes) return ntracks; |
41702fec | 2655 | |
2656 | ||
2657 | // Start finding seeds | |
2658 | Double_t cond0[4], cond1[4], cond2[4]; | |
2659 | Int_t icl = 0; | |
d611c74f | 2660 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec | 2661 | if(!c[3]) continue; |
d611c74f | 2662 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2663 | fSeedTB[0]->GetClusters(cond0, index, ncl); | |
41702fec | 2664 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2665 | Int_t jcl = 0; | |
2666 | while(jcl<ncl) { | |
d611c74f | 2667 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec | 2668 | if(!c[0]) continue; |
2669 | Double_t dx = c[3]->GetX() - c[0]->GetX(); | |
afa21247 | 2670 | Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx; |
2671 | Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx; | |
2672 | fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx); | |
d611c74f | 2673 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); |
41702fec | 2674 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2675 | ||
2676 | Int_t kcl = 0; | |
2677 | while(kcl<mcl) { | |
d611c74f | 2678 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2679 | if(!c[1]) continue; | |
afa21247 | 2680 | fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx); |
d611c74f | 2681 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); |
2682 | //printf("Found c[1] candidate 2 %p\n", c[2]); | |
2683 | if(!c[2]) continue; | |
980d5a2a | 2684 | |
2685 | AliDebug(3, Form("Seeding clusters\n 0[%6.3f %6.3f %6.3f]\n 1[%6.3f %6.3f %6.3f]\n 2[%6.3f %6.3f %6.3f]\n 3[%6.3f %6.3f %6.3f].", | |
2686 | c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(), | |
2687 | c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(), | |
2688 | c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(), | |
2689 | c[3]->GetX(), c[3]->GetY(), c[3]->GetZ())); | |
d611c74f | 2690 | |
804bb02e | 2691 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec | 2692 | |
d611c74f | 2693 | FitRieman(c, chi2); |
2694 | ||
d931f2aa | 2695 | AliTRDseedV1 *tseed = &cseed[0]; |
bb2db46c | 2696 | cIter = &stack[0]; |
2697 | for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){ | |
2698 | Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1; | |
eb2b4f91 | 2699 | tseed->SetDetector(det); |
43d6ad34 | 2700 | tseed->SetTilt(hL[iLayer]); |
2701 | tseed->SetPadLength(padlength[iLayer]); | |
dd8059a8 | 2702 | tseed->SetPadWidth(padwidth[iLayer]); |
4d6aee34 | 2703 | tseed->SetReconstructor(fkReconstructor); |
eb2b4f91 | 2704 | tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]); |
d611c74f | 2705 | tseed->Init(GetRiemanFitter()); |
f29f13a6 | 2706 | tseed->SetStandAlone(kTRUE); |
d611c74f | 2707 | } |
2708 | ||
2709 | Bool_t isFake = kFALSE; | |
9e85cb05 | 2710 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
d611c74f | 2711 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2712 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2713 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2714 | ||
2715 | Double_t xpos[4]; | |
2716 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); | |
2717 | Float_t yref[4]; | |
2718 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); | |
2719 | Int_t ll = c[3]->GetLabel(0); | |
2720 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2721 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2722 | AliRieman *rim = GetRiemanFitter(); | |
a2fbb6ec | 2723 | TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f | 2724 | cs0 << "MakeSeeds0" |
2725 | <<"EventNumber=" << eventNumber | |
2726 | <<"CandidateNumber=" << candidateNumber | |
2727 | <<"isFake=" << isFake | |
2728 | <<"config=" << config | |
2729 | <<"label=" << ll | |
2730 | <<"chi2z=" << chi2[0] | |
2731 | <<"chi2y=" << chi2[1] | |
2732 | <<"Y2exp=" << cond2[0] | |
2733 | <<"Z2exp=" << cond2[1] | |
2734 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() | |
2735 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() | |
2736 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() | |
2737 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() | |
2738 | <<"yref0=" << yref[0] | |
2739 | <<"yref1=" << yref[1] | |
2740 | <<"yref2=" << yref[2] | |
2741 | <<"yref3=" << yref[3] | |
2742 | <<"c0.=" << c[0] | |
2743 | <<"c1.=" << c[1] | |
2744 | <<"c2.=" << c[2] | |
2745 | <<"c3.=" << c[3] | |
2746 | <<"Seed0.=" << &cseed[planes[0]] | |
2747 | <<"Seed1.=" << &cseed[planes[1]] | |
2748 | <<"Seed2.=" << &cseed[planes[2]] | |
2749 | <<"Seed3.=" << &cseed[planes[3]] | |
2750 | <<"RiemanFitter.=" << rim | |
2751 | <<"\n"; | |
2752 | } | |
9e85cb05 | 2753 | if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
980d5a2a | 2754 | AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0])); |
d611c74f | 2755 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2756 | continue; | |
2757 | } | |
9e85cb05 | 2758 | if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
980d5a2a | 2759 | AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1])); |
d611c74f | 2760 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2761 | continue; | |
2762 | } | |
2763 | //AliInfo("Passed chi2 filter."); | |
2764 | ||
2765 | // try attaching clusters to tracklets | |
6e39bde4 | 2766 | Int_t mlayers = 0; |
980d5a2a | 2767 | AliTRDcluster *cl = NULL; |
be24510a | 2768 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f | 2769 | Int_t jLayer = planes[iLayer]; |
980d5a2a | 2770 | Int_t nNotInChamber = 0; |
f29f13a6 | 2771 | if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue; |
980d5a2a | 2772 | if(/*fkReconstructor->IsHLT()*/kFALSE){ |
2773 | cseed[jLayer].UpdateUsed(); | |
2774 | if(!cseed[jLayer].IsOK()) continue; | |
2775 | }else{ | |
2776 | cseed[jLayer].Fit(); | |
2777 | cseed[jLayer].UpdateUsed(); | |
2778 | cseed[jLayer].ResetClusterIter(); | |
2779 | while((cl = cseed[jLayer].NextCluster())){ | |
2780 | if(!cl->IsInChamber()) nNotInChamber++; | |
2781 | } | |
2782 | //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber); | |
2783 | if(cseed[jLayer].GetN() - (cseed[jLayer].GetNUsed() + nNotInChamber) < 5) continue; // checking for Cluster which are not in chamber is a much stronger restriction on real data | |
2784 | } | |
d611c74f | 2785 | mlayers++; |
2786 | } | |
be24510a | 2787 | |
2788 | if(mlayers < kNSeedPlanes){ | |
980d5a2a | 2789 | AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes)); |
be24510a | 2790 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2791 | continue; | |
2792 | } | |
2793 | ||
2794 | // temporary exit door for the HLT | |
4d6aee34 | 2795 | if(fkReconstructor->IsHLT()){ |
be24510a | 2796 | // attach clusters to extrapolation chambers |
2797 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ | |
2798 | Int_t jLayer = planesExt[iLayer]; | |
2799 | if(!(chamber = stack[jLayer])) continue; | |
980d5a2a | 2800 | if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue; |
5f1ae1e7 | 2801 | cseed[jLayer].Fit(); |
be24510a | 2802 | } |
4302c900 | 2803 | fTrackQuality[ntracks] = 1.; // dummy value |
2804 | ntracks++; | |
218ba867 | 2805 | if(ntracks == kMaxTracksStack) return ntracks; |
4302c900 | 2806 | cseed += 6; |
2807 | continue; | |
2808 | } | |
2809 | ||
be24510a | 2810 | |
f29f13a6 | 2811 | // Update Seeds and calculate Likelihood |
d611c74f | 2812 | // fit tracklets and cook likelihood |
f29f13a6 | 2813 | FitTiltedRieman(&cseed[0], kTRUE); |
2814 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ | |
2815 | Int_t jLayer = planes[iLayer]; | |
2816 | cseed[jLayer].Fit(kTRUE); | |
2817 | } | |
91834b8d | 2818 | Double_t like = CookLikelihood(&cseed[0], planes); // to be checked |
d611c74f | 2819 | |
9e85cb05 | 2820 | if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){ |
980d5a2a | 2821 | AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
d611c74f | 2822 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2823 | continue; | |
2824 | } | |
2825 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); | |
2826 | ||
2827 | // book preliminary results | |
2828 | seedQuality[ntracks] = like; | |
2829 | fSeedLayer[ntracks] = config;/*sLayer;*/ | |
2830 | ||
2831 | // attach clusters to the extrapolation seeds | |
980d5a2a | 2832 | Int_t elayers(0); |
be24510a | 2833 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2834 | Int_t jLayer = planesExt[iLayer]; | |
d611c74f | 2835 | if(!(chamber = stack[jLayer])) continue; |
d611c74f | 2836 | |
2837 | // fit extrapolated seed | |
2838 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; | |
2839 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; | |
2840 | AliTRDseedV1 pseed = cseed[jLayer]; | |
f29f13a6 | 2841 | if(!pseed.AttachClusters(chamber, kTRUE)) continue; |
2842 | pseed.Fit(kTRUE); | |
d611c74f | 2843 | cseed[jLayer] = pseed; |
d611c74f | 2844 | FitTiltedRieman(cseed, kTRUE); |
f29f13a6 | 2845 | cseed[jLayer].Fit(kTRUE); |
980d5a2a | 2846 | elayers++; |
d611c74f | 2847 | } |
2848 | ||
2849 | // AliInfo("Extrapolation done."); | |
2850 | // Debug Stream containing all the 6 tracklets | |
9e85cb05 | 2851 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
a2fbb6ec | 2852 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f | 2853 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2854 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2855 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2856 | cstreamer << "MakeSeeds1" | |
2857 | << "EventNumber=" << eventNumber | |
2858 | << "CandidateNumber=" << candidateNumber | |
2859 | << "S0.=" << &cseed[0] | |
2860 | << "S1.=" << &cseed[1] | |
2861 | << "S2.=" << &cseed[2] | |
2862 | << "S3.=" << &cseed[3] | |
2863 | << "S4.=" << &cseed[4] | |
2864 | << "S5.=" << &cseed[5] | |
2865 | << "FitterT.=" << tiltedRieman | |
2866 | << "\n"; | |
2867 | } | |
2868 | ||
9e85cb05 | 2869 | if(fkRecoParam->HasImproveTracklets()){ |
980d5a2a | 2870 | AliTRDseedV1 bseed[AliTRDgeometry::kNlayer]; |
2871 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer] = cseed[jLayer]; | |
2872 | ||
2873 | if(ImproveSeedQuality(stack, cseed) < mlayers+elayers){ | |
2874 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2875 | AliDebug(3, "Filter on improve seeds."); | |
2876 | } else { | |
2877 | // store results | |
2878 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer] = bseed[jLayer]; | |
2879 | } | |
d611c74f | 2880 | } |
2881 | //AliInfo("Improve seed quality done."); | |
2882 | ||
2883 | // fit full track and cook likelihoods | |
2884 | // Double_t curv = FitRieman(&cseed[0], chi2); | |
2885 | // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.); | |
2886 | // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.); | |
2887 | ||
2888 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) | |
2889 | Double_t chi2Vals[3]; | |
6e39bde4 | 2890 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE); |
9e85cb05 | 2891 | if(fkRecoParam->IsVertexConstrained()) |
d611c74f | 2892 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired |
2893 | else | |
2894 | chi2Vals[1] = 1.; | |
2895 | chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.); | |
2896 | // Chi2 definitions in testing stage | |
2897 | //chi2Vals[2] = GetChi2ZTest(&cseed[0]); | |
2898 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); | |
2899 | //AliInfo("Hyperplane fit done\n"); | |
fac58f00 | 2900 | |
9e85cb05 | 2901 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
a2fbb6ec | 2902 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f | 2903 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2904 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2905 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); | |
2906 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); | |
91834b8d | 2907 | Int_t ncls = 0; |
2908 | for(Int_t iseed = 0; iseed < kNPlanes; iseed++){ | |
2909 | ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0; | |
2910 | } | |
d611c74f | 2911 | cstreamer << "MakeSeeds2" |
2912 | << "EventNumber=" << eventNumber | |
2913 | << "CandidateNumber=" << candidateNumber | |
2914 | << "Chi2TR=" << chi2Vals[0] | |
2915 | << "Chi2TC=" << chi2Vals[1] | |
2916 | << "Nlayers=" << mlayers | |
91834b8d | 2917 | << "NClusters=" << ncls |
d611c74f | 2918 | << "Like=" << like |
2919 | << "S0.=" << &cseed[0] | |
2920 | << "S1.=" << &cseed[1] | |
2921 | << "S2.=" << &cseed[2] | |
2922 | << "S3.=" << &cseed[3] | |
2923 | << "S4.=" << &cseed[4] | |
2924 | << "S5.=" << &cseed[5] | |
d611c74f | 2925 | << "FitterT.=" << fitterT |
2926 | << "FitterTC.=" << fitterTC | |
2927 | << "\n"; | |
2928 | } | |
2929 | ||
2930 | ntracks++; | |
2931 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2932 | if(ntracks == kMaxTracksStack){ | |
2933 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); | |
2934 | return ntracks; | |
2935 | } | |
2936 | cseed += 6; | |
41702fec | 2937 | } |
2938 | } | |
2939 | } | |
41702fec | 2940 | |
2941 | return ntracks; | |
e4f2f73d | 2942 | } |
2943 | ||
2944 | //_____________________________________________________________________________ | |
e17f4785 | 2945 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const seeds, Double_t *params) |
e4f2f73d | 2946 | { |
afa21247 | 2947 | // |
2948 | // Build a TRD track out of tracklet candidates | |
2949 | // | |
2950 | // Parameters : | |
2951 | // seeds : array of tracklets | |
2952 | // params : array of track parameters as they are estimated by stand alone tracker. 7 elements. | |
2953 | // [0] - radial position of the track at reference point | |
2954 | // [1] - y position of the fit at [0] | |
2955 | // [2] - z position of the fit at [0] | |
2956 | // [3] - snp of the first tracklet | |
2957 | // [4] - tgl of the first tracklet | |
2958 | // [5] - curvature of the Riemann fit - 1/pt | |
2959 | // [6] - sector rotation angle | |
2960 | // | |
2961 | // Output : | |
2962 | // The TRD track. | |
2963 | // | |
2964 | // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix | |
2965 | // (diagonal with constant variance terms TODO - correct parameterization) | |
2966 | // | |
2967 | // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the | |
2968 | // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation() | |
2969 | // for details). Do also MC label calculation and PID if propagation successfully. | |
41702fec | 2970 | |
afa21247 | 2971 | |
41702fec | 2972 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
2973 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; | |
2974 | Double_t c[15]; | |
2975 | ||
afa21247 | 2976 | c[ 0] = 0.2; // s^2_y |
2977 | c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z | |
2978 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp | |
2979 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl | |
2980 | c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt | |
41702fec | 2981 | |
d20df6fc | 2982 | AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
2983 | track.PropagateTo(params[0]-5.0); | |
4d6aee34 | 2984 | AliTRDseedV1 *ptrTracklet = NULL; |
9887cc9f | 2985 | |
2986 | // skip Kalman filter for HLT | |
5f1ae1e7 | 2987 | if(/*fkReconstructor->IsHLT()*/kFALSE){ |
9887cc9f | 2988 | for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) { |
2989 | track.UnsetTracklet(jLayer); | |
e17f4785 | 2990 | ptrTracklet = &seeds[jLayer]; |
9887cc9f | 2991 | if(!ptrTracklet->IsOK()) continue; |
5f1ae1e7 | 2992 | if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian |
9887cc9f | 2993 | ptrTracklet = SetTracklet(ptrTracklet); |
f29f13a6 | 2994 | ptrTracklet->UseClusters(); |
91834b8d | 2995 | track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
2996 | } | |
d78d7df0 | 2997 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
799e38d7 | 2998 | ptrTrack->CookPID(); |
5f1ae1e7 | 2999 | ptrTrack->CookLabel(.9); |
4d6aee34 | 3000 | ptrTrack->SetReconstructor(fkReconstructor); |
d78d7df0 | 3001 | return ptrTrack; |
91834b8d | 3002 | } |
393fda1c | 3003 | |
b1135f96 | 3004 | // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry" |
3005 | if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) | |
17e0e535 | 3006 | return NULL; |
3007 | ||
d20df6fc | 3008 | track.ResetCovariance(1); |
e79f8eb0 | 3009 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
9e85cb05 | 3010 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){ |
393fda1c | 3011 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3012 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
3013 | Double_t p[5]; // Track Params for the Debug Stream | |
3014 | track.GetExternalParameters(params[0], p); | |
a2fbb6ec | 3015 | TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
393fda1c | 3016 | cs << "MakeTrack" |
3017 | << "EventNumber=" << eventNumber | |
3018 | << "CandidateNumber=" << candidateNumber | |
3019 | << "nc=" << nc | |
3020 | << "X=" << params[0] | |
3021 | << "Y=" << p[0] | |
3022 | << "Z=" << p[1] | |
3023 | << "snp=" << p[2] | |
3024 | << "tnd=" << p[3] | |
3025 | << "crv=" << p[4] | |
3026 | << "Yin=" << params[1] | |
3027 | << "Zin=" << params[2] | |
3028 | << "snpin=" << params[3] | |
3029 | << "tndin=" << params[4] | |
3030 | << "crvin=" << params[5] | |
3031 | << "track.=" << &track | |
3032 | << "\n"; | |
3033 | } | |
4d6aee34 | 3034 | if (nc < 30) return NULL; |
d20df6fc | 3035 | |
3036 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); | |
4d6aee34 | 3037 | ptrTrack->SetReconstructor(fkReconstructor); |
48f8adf3 | 3038 | ptrTrack->CookLabel(.9); |
24253b0a | 3039 | |
d20df6fc | 3040 | // computes PID for track |
3041 | ptrTrack->CookPID(); | |
3042 | // update calibration references using this track | |
48f8adf3 | 3043 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
3044 | if (!calibra){ | |
3045 | AliInfo("Could not get Calibra instance\n"); | |
3046 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack); | |
3047 | } | |
d20df6fc | 3048 | return ptrTrack; |
e4f2f73d | 3049 | } |
3050 | ||
0906e73e | 3051 | |
e4f2f73d | 3052 | //____________________________________________________________________ |
eb38ed55 | 3053 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d | 3054 | { |
41702fec | 3055 | // |
3056 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst | |
3057 | // | |
3058 | // Parameters : | |
3059 | // layers : Array of propagation layers for a stack/supermodule | |
3060 | // cseed : Array of 6 seeding tracklets which has to be improved | |
3061 | // | |
f29f13a6 | 3062 | // Output : |
41702fec | 3063 | // cssed : Improved seeds |
3064 | // | |
3065 | // Detailed description | |
3066 | // | |
3067 | // Iterative procedure in which new clusters are searched for each | |
3068 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) | |
3069 | // can be maximized. If some optimization is found the old seeds are replaced. | |
3070 | // | |
3071 | // debug level: 7 | |
3072 | // | |
3073 | ||
3074 | // make a local working copy | |
4d6aee34 | 3075 | AliTRDtrackingChamber *chamber = NULL; |
980d5a2a | 3076 | AliTRDseedV1 bseed[AliTRDgeometry::kNlayer]; |
3077 | ||
3078 | Float_t quality(0.), | |
3079 | lQuality[] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3}; | |
3080 | Int_t rLayers(0); | |
3081 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){ | |
3082 | bseed[jLayer] = cseed[jLayer]; | |
3083 | if(!bseed[jLayer].IsOK()) continue; | |
3084 | rLayers++; | |
3085 | lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE); | |
3086 | quality += lQuality[jLayer]; | |
3087 | } | |
3088 | Float_t chi2 = FitTiltedRieman(bseed, kTRUE); | |
41702fec | 3089 | |
3090 | for (Int_t iter = 0; iter < 4; iter++) { | |
560e5c05 | 3091 | AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2)); |
3092 | ||
980d5a2a | 3093 | // Try better cluster set |
3094 | Int_t nLayers(0); Float_t qualitynew(0.); | |
3095 | Int_t indexes[6]; | |
3096 | TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE); | |
3097 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) { | |
3098 | Int_t bLayer = indexes[jLayer]; | |
3099 | bseed[bLayer].Reset("c"); | |
41702fec | 3100 | if(!(chamber = stack[bLayer])) continue; |
980d5a2a | 3101 | if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue; |
f29f13a6 | 3102 | bseed[bLayer].Fit(kTRUE); |
980d5a2a | 3103 | if(!bseed[bLayer].IsOK()) continue; |
3104 | nLayers++; | |
3105 | lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE); | |
3106 | qualitynew += lQuality[jLayer]; | |
41702fec | 3107 | } |
980d5a2a | 3108 | if(rLayers > nLayers){ |
3109 | AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers)); | |
3110 | break; | |
3111 | } else rLayers=nLayers; | |
3112 | ||
3113 | if(qualitynew >= quality){ | |
3114 | AliDebug(4, Form("Quality worsen in iter[%d].", iter)); | |
3115 | break; | |
3116 | } else quality = qualitynew; | |
3117 | ||
3118 | // try improve track parameters | |
3119 | AliTRDseedV1 tseed[AliTRDgeometry::kNlayer]; | |
3120 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) tseed[jLayer]=bseed[jLayer]; | |
3121 | Float_t chi2new = FitTiltedRieman(tseed, kTRUE); | |
3122 | if(chi2new > chi2){ | |
3123 | AliDebug(4, Form("Chi2 worsen in iter[%d].", iter)); | |
3124 | break; | |
3125 | } else chi2 = chi2new; | |
3126 | ||
3127 | // store better tracklets | |
3128 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) bseed[jLayer]=tseed[jLayer]; | |
3129 | ||
41702fec | 3130 | |
9e85cb05 | 3131 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){ |
41702fec | 3132 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3133 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
3134 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); | |
a2fbb6ec | 3135 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec | 3136 | cstreamer << "ImproveSeedQuality" |
980d5a2a | 3137 | << "EventNumber=" << eventNumber |
3138 | << "CandidateNumber=" << candidateNumber | |
3139 | << "Iteration=" << iter | |
3140 | << "S0.=" << &bseed[0] | |
3141 | << "S1.=" << &bseed[1] | |
3142 | << "S2.=" << &bseed[2] | |
3143 | << "S3.=" << &bseed[3] | |
3144 | << "S4.=" << &bseed[4] | |
3145 | << "S5.=" << &bseed[5] | |
3146 | << "FitterT.=" << tiltedRieman | |
3147 | << "\n"; | |
41702fec | 3148 | } |
3149 | } // Loop: iter | |
41702fec | 3150 | // we are sure that at least 2 tracklets are OK ! |
980d5a2a | 3151 | return rLayers; |
e4f2f73d | 3152 | } |
3153 | ||
eb38ed55 | 3154 | //_________________________________________________________________________ |
4d6aee34 | 3155 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){ |
41702fec | 3156 | // |
3157 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for | |
3158 | // the track selection | |
3159 | // The likelihood value containes: | |
3160 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit | |
3161 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets | |
3162 | // For all Parameters an exponential dependency is used | |
3163 | // | |
3164 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
3165 | // - Array of chi2 values: | |
3166 | // * Non-Constrained Tilted Riemann fit | |
3167 | // * Vertex-Constrained Tilted Riemann fit | |
3168 | // * z-Direction from Linear fit | |
3169 | // Output: - The calculated track likelihood | |
3170 | // | |
3171 | // debug level 2 | |
3172 | // | |
3173 | ||
f29f13a6 | 3174 | Double_t chi2phi = 0, nLayers = 0; |
41702fec | 3175 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
3176 | if(!tracklets[iLayer].IsOK()) continue; | |
f29f13a6 | 3177 | chi2phi += tracklets[iLayer].GetChi2Phi(); |
41702fec | 3178 | nLayers++; |
3179 | } | |
f29f13a6 | 3180 | chi2phi /= Float_t (nLayers - 2.0); |
41702fec | 3181 | |
3182 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z | |
9e85cb05 | 3183 | Double_t likeChi2TC = (fkRecoParam->IsVertexConstrained()) ? |
d20df6fc | 3184 | TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann |
6e39bde4 | 3185 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann |
3186 | Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23 | |
f29f13a6 | 3187 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi; |
41702fec | 3188 | |
9e85cb05 | 3189 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
41702fec | 3190 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3191 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
a2fbb6ec | 3192 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec | 3193 | cstreamer << "CalculateTrackLikelihood0" |
3194 | << "EventNumber=" << eventNumber | |
3195 | << "CandidateNumber=" << candidateNumber | |
3196 | << "LikeChi2Z=" << likeChi2Z | |
3197 | << "LikeChi2TR=" << likeChi2TR | |
3198 | << "LikeChi2TC=" << likeChi2TC | |
f29f13a6 | 3199 | << "LikeChi2Phi=" << likeChi2Phi |
41702fec | 3200 | << "TrackLikelihood=" << trackLikelihood |
3201 | << "\n"; | |
3202 | } | |
6e39bde4 | 3203 | |
41702fec | 3204 | return trackLikelihood; |
e4f2f73d | 3205 | } |
3206 | ||
3207 | //____________________________________________________________________ | |
91834b8d | 3208 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]) |
e4f2f73d | 3209 | { |
41702fec | 3210 | // |
3211 | // Calculate the probability of this track candidate. | |
3212 | // | |
3213 | // Parameters : | |
3214 | // cseeds : array of candidate tracklets | |
3215 | // planes : array of seeding planes (see seeding configuration) | |
3216 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. | |
3217 | // | |
3218 | // Output : | |
3219 | // likelihood value | |
3220 | // | |
3221 | // Detailed description | |
3222 | // | |
3223 | // The track quality is estimated based on the following 4 criteria: | |
3224 | // 1. precision of the rieman fit on the Y direction (likea) | |
3225 | // 2. chi2 on the Y direction (likechi2y) | |
3226 | // 3. chi2 on the Z direction (likechi2z) | |
3227 | // 4. number of attached clusters compared to a reference value | |
3228 | // (see AliTRDrecoParam::fkFindable) (likeN) | |
3229 | // | |
3230 | // The distributions for each type of probabilities are given below as of | |
3231 | // (date). They have to be checked to assure consistency of estimation. | |
3232 | // | |
3233 | ||
3234 | // ratio of the total number of clusters/track which are expected to be found by the tracker. | |
91834b8d | 3235 | Double_t chi2y = GetChi2Y(&cseed[0]); |
3236 | Double_t chi2z = GetChi2Z(&cseed[0]); | |
3237 | ||
8ae98148 | 3238 | Float_t nclusters = 0.; |
41702fec | 3239 | Double_t sumda = 0.; |
3240 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ | |
3241 | Int_t jlayer = planes[ilayer]; | |
3242 | nclusters += cseed[jlayer].GetN2(); | |
e3cf3d02 | 3243 | sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1)); |
41702fec | 3244 | } |
8ae98148 | 3245 | nclusters *= .25; |
3246 | ||
9e85cb05 | 3247 | Double_t likea = TMath::Exp(-sumda * fkRecoParam->GetPhiSlope()); |
41702fec | 3248 | Double_t likechi2y = 0.0000000001; |
9e85cb05 | 3249 | if (fkReconstructor->IsCosmic() || chi2y < fkRecoParam->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fkRecoParam->GetChi2YSlope()); |
3250 | Double_t likechi2z = TMath::Exp(-chi2z * fkRecoParam->GetChi2ZSlope()); | |
3251 | Double_t likeN = TMath::Exp(-(fkRecoParam->GetNMeanClusters() - nclusters) / fkRecoParam->GetNSigmaClusters()); | |
41702fec | 3252 | Double_t like = likea * likechi2y * likechi2z * likeN; |
3253 | ||
9e85cb05 | 3254 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
41702fec | 3255 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3256 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 3257 | Int_t nTracklets = 0; Float_t meanNcls = 0; |
91834b8d | 3258 | for(Int_t iseed=0; iseed < kNPlanes; iseed++){ |
3259 | if(!cseed[iseed].IsOK()) continue; | |
3260 | nTracklets++; | |
4d6aee34 | 3261 | meanNcls += cseed[iseed].GetN2(); |
91834b8d | 3262 | } |
4d6aee34 | 3263 | if(nTracklets) meanNcls /= nTracklets; |
41702fec | 3264 | // The Debug Stream contains the seed |
a2fbb6ec | 3265 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec | 3266 | cstreamer << "CookLikelihood" |
3267 | << "EventNumber=" << eventNumber | |
3268 | << "CandidateNumber=" << candidateNumber | |
3269 | << "tracklet0.=" << &cseed[0] | |
3270 | << "tracklet1.=" << &cseed[1] | |
3271 | << "tracklet2.=" << &cseed[2] | |
3272 | << "tracklet3.=" << &cseed[3] | |
3273 | << "tracklet4.=" << &cseed[4] | |
3274 | << "tracklet5.=" << &cseed[5] | |
3275 | << "sumda=" << sumda | |
91834b8d | 3276 | << "chi2y=" << chi2y |
3277 | << "chi2z=" << chi2z | |
41702fec | 3278 | << "likea=" << likea |
3279 | << "likechi2y=" << likechi2y | |
3280 | << "likechi2z=" << likechi2z | |
3281 | << "nclusters=" << nclusters | |
3282 | << "likeN=" << likeN | |
3283 | << "like=" << like | |
4d6aee34 | 3284 | << "meanncls=" << meanNcls |
41702fec | 3285 | << "\n"; |
3286 | } | |
3287 | ||
3288 | return like; | |
e4f2f73d | 3289 | } |
3290 | ||
e4f2f73d | 3291 | //____________________________________________________________________ |
0906e73e | 3292 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d | 3293 | { |
41702fec | 3294 | // |
3295 | // Map seeding configurations to detector planes. | |
3296 | // | |
3297 | // Parameters : | |
3298 | // iconfig : configuration index | |
3299 | // planes : member planes of this configuration. On input empty. | |
3300 | // | |
3301 | // Output : | |
3302 | // planes : contains the planes which are defining the configuration | |
3303 | // | |
3304 | // Detailed description | |
3305 | // | |
3306 | // Here is the list of seeding planes configurations together with | |
3307 | // their topological classification: | |
3308 | // | |
3309 | // 0 - 5432 TQ 0 | |
3310 | // 1 - 4321 TQ 0 | |
3311 | // 2 - 3210 TQ 0 | |
3312 | // 3 - 5321 TQ 1 | |
3313 | // 4 - 4210 TQ 1 | |
3314 | // 5 - 5431 TQ 1 | |
3315 | // 6 - 4320 TQ 1 | |
3316 | // 7 - 5430 TQ 2 | |
3317 | // 8 - 5210 TQ 2 | |
3318 | // 9 - 5421 TQ 3 | |
3319 | // 10 - 4310 TQ 3 | |
3320 | // 11 - 5410 TQ 4 | |
3321 | // 12 - 5420 TQ 5 | |
3322 | // 13 - 5320 TQ 5 | |
3323 | // 14 - 5310 TQ 5 | |
3324 | // | |
3325 | // The topologic quality is modeled as follows: | |
3326 | // 1. The general model is define by the equation: | |
3327 | // p(conf) = exp(-conf/2) | |
3328 | // 2. According to the topologic classification, configurations from the same | |
3329 | // class are assigned the agerage value over the model values. | |
3330 | // 3. Quality values are normalized. | |
3331 | // | |
3332 | // The topologic quality distribution as function of configuration is given below: | |
3333 | //Begin_Html | |
3334 | // <img src="gif/topologicQA.gif"> | |
3335 | //End_Html | |
3336 | // | |
3337 | ||
3338 | switch(iconfig){ | |
3339 | case 0: // 5432 TQ 0 | |
3340 | planes[0] = 2; | |
3341 | planes[1] = 3; | |
3342 | planes[2] = 4; | |
3343 | planes[3] = 5; | |
3344 | break; | |
3345 | case 1: // 4321 TQ 0 | |
3346 | planes[0] = 1; | |
3347 | planes[1] = 2; | |
3348 | planes[2] = 3; | |
3349 | planes[3] = 4; | |
3350 | break; | |
3351 | case 2: // 3210 TQ 0 | |
3352 | planes[0] = 0; | |
3353 | planes[1] = 1; | |
3354 | planes[2] = 2; | |
3355 | planes[3] = 3; | |
3356 | break; | |
3357 | case 3: // 5321 TQ 1 | |
3358 | planes[0] = 1; | |
3359 | planes[1] = 2; | |
3360 | planes[2] = 3; | |
3361 | planes[3] = 5; | |
3362 | break; | |
3363 | case 4: // 4210 TQ 1 | |
3364 | planes[0] = 0; | |
3365 | planes[1] = 1; | |
3366 | planes[2] = 2; | |
3367 | planes[3] = 4; | |
3368 | break; | |
3369 | case 5: // 5431 TQ 1 | |
3370 | planes[0] = 1; | |
3371 | planes[1] = 3; | |
3372 | planes[2] = 4; | |
3373 | planes[3] = 5; | |
3374 | break; | |
3375 | case 6: // 4320 TQ 1 | |
3376 | planes[0] = 0; | |
3377 | planes[1] = 2; | |
3378 | planes[2] = 3; | |
3379 | planes[3] = 4; | |
3380 | break; | |
3381 | case 7: // 5430 TQ 2 | |
3382 | planes[0] = 0; | |
3383 | planes[1] = 3; | |
3384 | planes[2] = 4; | |
3385 | planes[3] = 5; | |
3386 | break; | |
3387 | case 8: // 5210 TQ 2 | |
3388 | planes[0] = 0; | |
3389 | planes[1] = 1; | |
3390 | planes[2] = 2; | |
3391 | planes[3] = 5; | |
3392 | break; | |
3393 | case 9: // 5421 TQ 3 | |
3394 | planes[0] = 1; | |
3395 | planes[1] = 2; | |
3396 | planes[2] = 4; | |
3397 | planes[3] = 5; | |
3398 | break; | |
3399 | case 10: // 4310 TQ 3 | |
3400 | planes[0] = 0; | |
3401 | planes[1] = 1; | |
3402 | planes[2] = 3; | |
3403 | planes[3] = 4; | |
3404 | break; | |
3405 | case 11: // 5410 TQ 4 | |
3406 | planes[0] = 0; | |
3407 | planes[1] = 1; | |
3408 | planes[2] = 4; | |
3409 | planes[3] = 5; | |
3410 | break; | |
3411 | case 12: // 5420 TQ 5 | |
3412 | planes[0] = 0; | |
3413 | planes[1] = 2; | |
3414 | planes[2] = 4; | |
3415 | planes[3] = 5; | |
3416 | break; | |
3417 | case 13: // 5320 TQ 5 | |
3418 | planes[0] = 0; | |
3419 | planes[1] = 2; | |
3420 | planes[2] = 3; | |
3421 | planes[3] = 5; | |
3422 | break; | |
3423 | case 14: // 5310 TQ 5 | |
3424 | planes[0] = 0; | |
3425 | planes[1] = 1; | |
3426 | planes[2] = 3; | |
3427 | planes[3] = 5; | |
3428 | break; | |
3429 | } | |
e4f2f73d | 3430 | } |
3431 | ||
3432 | //____________________________________________________________________ | |
0906e73e | 3433 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d | 3434 | { |
41702fec | 3435 | // |
3436 | // Returns the extrapolation planes for a seeding configuration. | |
3437 | // | |
3438 | // Parameters : | |
3439 | // iconfig : configuration index | |
3440 | // planes : planes which are not in this configuration. On input empty. | |
3441 | // | |
3442 | // Output : | |
3443 | // planes : contains the planes which are not in the configuration | |
3444 | // | |
3445 | // Detailed description | |
3446 | // | |
3447 | ||
3448 | switch(iconfig){ | |
3449 | case 0: // 5432 TQ 0 | |
3450 | planes[0] = 1; | |
3451 | planes[1] = 0; | |
3452 | break; | |
3453 | case 1: // 4321 TQ 0 | |
3454 | planes[0] = 5; | |
3455 | planes[1] = 0; | |
3456 | break; | |
3457 | case 2: // 3210 TQ 0 | |
3458 | planes[0] = 4; | |
3459 | planes[1] = 5; | |
3460 | break; | |
3461 | case 3: // 5321 TQ 1 | |
3462 | planes[0] = 4; | |
3463 | planes[1] = 0; | |
3464 | break; | |
3465 | case 4: // 4210 TQ 1 | |
3466 | planes[0] = 5; | |
3467 | planes[1] = 3; | |
3468 | break; | |
3469 | case 5: // 5431 TQ 1 | |
3470 | planes[0] = 2; | |
3471 | planes[1] = 0; | |
3472 | break; | |
3473 | case 6: // 4320 TQ 1 | |
3474 | planes[0] = 5; | |
3475 | planes[1] = 1; | |
3476 | break; | |
3477 | case 7: // 5430 TQ 2 | |
3478 | planes[0] = 2; | |
3479 | planes[1] = 1; | |
3480 | break; | |
3481 | case 8: // 5210 TQ 2 | |
3482 | planes[0] = 4; | |
3483 | planes[1] = 3; | |
3484 | break; | |
3485 | case 9: // 5421 TQ 3 | |
3486 | planes[0] = 3; | |
3487 | planes[1] = 0; | |
3488 | break; | |
3489 | case 10: // 4310 TQ 3 | |
3490 | planes[0] = 5; | |
3491 | planes[1] = 2; | |
3492 | break; | |
3493 | case 11: // 5410 TQ 4 | |
3494 | planes[0] = 3; | |
3495 | planes[1] = 2; | |
3496 | break; | |
3497 | case 12: // 5420 TQ 5 | |
3498 | planes[0] = 3; | |
3499 | planes[1] = 1; | |
3500 | break; | |
3501 | case 13: // 5320 TQ 5 | |
3502 | planes[0] = 4; | |
3503 | planes[1] = 1; | |
3504 | break; | |
3505 | case 14: // 5310 TQ 5 | |
3506 | planes[0] = 4; | |
3507 | planes[1] = 2; | |
3508 | break; | |
3509 | } | |
e4f2f73d | 3510 | } |
eb38ed55 | 3511 | |
3512 | //____________________________________________________________________ | |
3513 | AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const | |
3514 | { | |
971a356b | 3515 | if(!fClusters) return NULL; |
41702fec | 3516 | Int_t ncls = fClusters->GetEntriesFast(); |
4d6aee34 | 3517 | return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL; |
eb38ed55 | 3518 | } |
3519 | ||
3b57a3f7 | 3520 | //____________________________________________________________________ |
3521 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const | |
3522 | { | |
971a356b | 3523 | if(!fTracklets) return NULL; |
41702fec | 3524 | Int_t ntrklt = fTracklets->GetEntriesFast(); |
4d6aee34 | 3525 | return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL; |
3b57a3f7 | 3526 | } |
3527 | ||
3528 | //____________________________________________________________________ | |
3529 | AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const | |
3530 | { | |
971a356b | 3531 | if(!fTracks) return NULL; |
41702fec | 3532 | Int_t ntrk = fTracks->GetEntriesFast(); |
4d6aee34 | 3533 | return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL; |
3b57a3f7 | 3534 | } |
3535 | ||
6e39bde4 | 3536 | |
eb38ed55 | 3537 | |
fac58f00 | 3538 | // //_____________________________________________________________________________ |
3539 | // Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist | |
3540 | // , Int_t *outlist, Bool_t down) | |
3541 | // { | |
3542 | // // | |
3543 | // // Sort eleements according occurancy | |
3544 | // // The size of output array has is 2*n | |
3545 | // // | |
3546 | // | |
3547 | // if (n <= 0) { | |
3548 | // return 0; | |
3549 | // } | |
3550 | // | |
3551 | // Int_t *sindexS = new Int_t[n]; // Temporary array for sorting | |
3552 | // Int_t *sindexF = new Int_t[2*n]; | |
3553 | // for (Int_t i = 0; i < n; i++) { | |
3554 | // sindexF[i] = 0; | |
3555 | // } | |
3556 | // | |
3557 | // TMath::Sort(n,inlist,sindexS,down); | |
3558 | // | |
3559 | // Int_t last = inlist[sindexS[0]]; | |
3560 | // Int_t val = last; | |
3561 | // sindexF[0] = 1; | |
3562 | // sindexF[0+n] = last; | |
3563 | // Int_t countPos = 0; | |
3564 | // | |
3565 | // // Find frequency | |
3566 | // for (Int_t i = 1; i < n; i++) { | |
3567 | // val = inlist[sindexS[i]]; | |
3568 | // if (last == val) { | |
3569 | // sindexF[countPos]++; | |
3570 | // } | |
3571 | // else { | |
3572 | // countPos++; | |
3573 | // sindexF[countPos+n] = val; | |
3574 | // sindexF[countPos]++; | |
3575 | // last = val; | |
3576 | // } | |
3577 | // } | |
3578 | // if (last == val) { | |
3579 | // countPos++; | |
3580 | // } | |
3581 | // | |
3582 | // // Sort according frequency | |
3583 | // TMath::Sort(countPos,sindexF,sindexS,kTRUE); | |
3584 | // | |
3585 | // for (Int_t i = 0; i < countPos; i++) { | |
3586 | // outlist[2*i ] = sindexF[sindexS[i]+n]; | |
3587 | // outlist[2*i+1] = sindexF[sindexS[i]]; | |
3588 | // } | |
3589 | // | |
3590 | // delete [] sindexS; | |
3591 | // delete [] sindexF; | |
3592 | // | |
3593 | // return countPos; | |
3594 | // | |
3595 | // } | |
bb56afff | 3596 | |
06b32d95 | 3597 | |
d611c74f | 3598 | //____________________________________________________________________ |
3599 | void AliTRDtrackerV1::ResetSeedTB() | |
3600 | { | |
3601 | // reset buffer for seeding time bin layers. If the time bin | |
3602 | // layers are not allocated this function allocates them | |
3603 | ||
3604 | for(Int_t isl=0; isl<kNSeedPlanes; isl++){ | |
3605 | if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin(); | |
3606 | else fSeedTB[isl]->Clear(); | |
3607 | } | |
3608 | } | |
3609 | ||
e3cf3d02 | 3610 | |
3611 | //_____________________________________________________________________________ | |
4d6aee34 | 3612 | Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const |
e3cf3d02 | 3613 | { |
3614 | // Calculates normalized chi2 in y-direction | |
3615 | // chi2 = Sum chi2 / n_tracklets | |
3616 | ||
3617 | Double_t chi2 = 0.; Int_t n = 0; | |
3618 | for(Int_t ipl = kNPlanes; ipl--;){ | |
3619 | if(!tracklets[ipl].IsOK()) continue; | |
3620 | chi2 += tracklets[ipl].GetChi2Y(); | |
3621 | n++; | |
3622 | } | |
3623 | return n ? chi2/n : 0.; | |
3624 | } | |
3625 | ||
bb56afff | 3626 | //_____________________________________________________________________________ |
4d6aee34 | 3627 | Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const |
bb56afff | 3628 | { |
91834b8d | 3629 | // Calculates normalized chi2 in z-direction |
e3cf3d02 | 3630 | // chi2 = Sum chi2 / n_tracklets |
41702fec | 3631 | |
e3cf3d02 | 3632 | Double_t chi2 = 0; Int_t n = 0; |
3633 | for(Int_t ipl = kNPlanes; ipl--;){ | |
41702fec | 3634 | if(!tracklets[ipl].IsOK()) continue; |
e3cf3d02 | 3635 | chi2 += tracklets[ipl].GetChi2Z(); |
3636 | n++; | |
41702fec | 3637 | } |
e3cf3d02 | 3638 | return n ? chi2/n : 0.; |
bb56afff | 3639 | } |
8acca6a3 | 3640 | |
6e39bde4 | 3641 | //____________________________________________________________________ |
4d6aee34 | 3642 | Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const tracklets){ |
6e39bde4 | 3643 | // |
3644 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
3645 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
3646 | // are taken into account | |
3647 | // | |
3648 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
3649 | // | |
3650 | // Output: - The reference x-position(Float_t) | |
3651 | // Only kept for compatibility with the old code | |
3652 | // | |
3653 | Int_t nDistances = 0; | |
3654 | Float_t meanDistance = 0.; | |
3655 | Int_t startIndex = 5; | |
3656 | for(Int_t il =5; il > 0; il--){ | |
3657 | if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){ | |
3658 | Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0(); | |
3659 | meanDistance += xdiff; | |
3660 | nDistances++; | |
3661 | } | |
3662 | if(tracklets[il].IsOK()) startIndex = il; | |
3663 | } | |
3664 | if(tracklets[0].IsOK()) startIndex = 0; | |
3665 | if(!nDistances){ | |
3666 | // We should normally never get here | |
3667 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
3668 | Int_t iok = 0, idiff = 0; | |
3669 | // This attempt is worse and should be avoided: | |
3670 | // check for two chambers which are OK and repeat this without taking the mean value | |
3671 | // Strategy avoids a division by 0; | |
3672 | for(Int_t il = 5; il >= 0; il--){ | |
3673 | if(tracklets[il].IsOK()){ | |
3674 | xpos[iok] = tracklets[il].GetX0(); | |
3675 | iok++; | |
3676 | startIndex = il; | |
3677 | } | |
3678 | if(iok) idiff++; // to get the right difference; | |
3679 | if(iok > 1) break; | |
3680 | } | |
3681 | if(iok > 1){ | |
3682 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
3683 | } | |
3684 | else{ | |
3685 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
3686 | return 331.; | |
3687 | } | |
3688 | } | |
3689 | else{ | |
3690 | meanDistance /= nDistances; | |
3691 | } | |
3692 | return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
3693 | } | |
3694 | ||
3695 | //_____________________________________________________________________________ | |
4d6aee34 | 3696 | Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){ |
6e39bde4 | 3697 | // |
3698 | // Track Fitter Function using the new class implementation of | |
3699 | // the Rieman fit | |
3700 | // | |
3701 | AliTRDtrackFitterRieman fitter; | |
3702 | fitter.SetRiemanFitter(GetTiltedRiemanFitter()); | |
3703 | fitter.Reset(); | |
3704 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]); | |
3705 | Double_t chi2 = fitter.Eval(); | |
3706 | // Update the tracklets | |
3707 | Double_t cov[15]; Double_t x0; | |
3708 | memset(cov, 0, sizeof(Double_t) * 15); | |
3709 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){ | |
3710 | x0 = tracklets[il].GetX0(); | |
3711 | tracklets[il].SetYref(0, fitter.GetYat(x0)); | |
3712 | tracklets[il].SetZref(0, fitter.GetZat(x0)); | |
3713 | tracklets[il].SetYref(1, fitter.GetDyDxAt(x0)); | |
3714 | tracklets[il].SetZref(1, fitter.GetDzDx()); | |
3715 | tracklets[il].SetC(fitter.GetCurvature()); | |
3716 | fitter.GetCovAt(x0, cov); | |
3717 | tracklets[il].SetCovRef(cov); | |
3718 | tracklets[il].SetChi2(chi2); | |
3719 | } | |
3720 | return chi2; | |
3721 | } | |
3722 | ||
8acca6a3 | 3723 | /////////////////////////////////////////////////////// |
3724 | // // | |
3725 | // Resources of class AliTRDLeastSquare // | |
3726 | // // | |
3727 | /////////////////////////////////////////////////////// | |
3728 | ||
3729 | //_____________________________________________________________________________ | |
3730 | AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){ | |
903326c1 | 3731 | // |
3732 | // Constructor of the nested class AliTRDtrackFitterLeastSquare | |
3733 | // | |
3734 | // Fast solving linear regresion in 2D | |
0323ef61 | 3735 | // y=a + bx |
903326c1 | 3736 | // The data members have the following meaning |
0323ef61 | 3737 | // fParams[0] : a |
3738 | // fParams[1] : b | |
903326c1 | 3739 | // |
3740 | // fSums[0] : S | |
3741 | // fSums[1] : Sx | |
3742 | // fSums[2] : Sy | |
3743 | // fSums[3] : Sxy | |
3744 | // fSums[4] : Sxx | |
3745 | // fSums[5] : Syy | |
3746 | // | |
0323ef61 | 3747 | // fCovarianceMatrix[0] : s2a |
3748 | // fCovarianceMatrix[1] : s2b | |
903326c1 | 3749 | // fCovarianceMatrix[2] : cov(ab) |
3750 | ||
41702fec | 3751 | memset(fParams, 0, sizeof(Double_t) * 2); |
341512a4 | 3752 | memset(fSums, 0, sizeof(Double_t) * 6); |
41702fec | 3753 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); |
8acca6a3 | 3754 | |
3755 | } | |
3756 | ||
3757 | //_____________________________________________________________________________ | |
4d6aee34 | 3758 | void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){ |
41702fec | 3759 | // |
3760 | // Adding Point to the fitter | |
3761 | // | |
5f1ae1e7 | 3762 | |
2ed81ab2 | 3763 | Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9); |
3764 | weight *= weight; | |
4d6aee34 | 3765 | const Double_t &xpt = *x; |
41702fec | 3766 | // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY); |
3767 | fSums[0] += weight; | |
3768 | fSums[1] += weight * xpt; | |
3769 | fSums[2] += weight * y; | |
3770 | fSums[3] += weight * xpt * y; | |
3771 | fSums[4] += weight * xpt * xpt; | |
3772 | fSums[5] += weight * y * y; | |
8acca6a3 | 3773 | } |
3774 | ||
3775 | //_____________________________________________________________________________ | |
4d6aee34 | 3776 | void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){ |
41702fec | 3777 | // |
3778 | // Remove Point from the sample | |
3779 | // | |
5f1ae1e7 | 3780 | |
2ed81ab2 | 3781 | Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9); |
3782 | weight *= weight; | |
4d6aee34 | 3783 | const Double_t &xpt = *x; |
41702fec | 3784 | fSums[0] -= weight; |
3785 | fSums[1] -= weight * xpt; | |
3786 | fSums[2] -= weight * y; | |
3787 | fSums[3] -= weight * xpt * y; | |
3788 | fSums[4] -= weight * xpt * xpt; | |
3789 | fSums[5] -= weight * y * y; | |
8acca6a3 | 3790 | } |
3791 | ||
3792 | //_____________________________________________________________________________ | |
903326c1 | 3793 | Bool_t AliTRDtrackerV1::AliTRDLeastSquare::Eval(){ |
41702fec | 3794 | // |
3795 | // Evaluation of the fit: | |
3796 | // Calculation of the parameters | |
3797 | // Calculation of the covariance matrix | |
3798 | // | |
3799 | ||
903326c1 | 3800 | Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1]; |
3801 | if(det==0) return kFALSE; | |
aec26713 | 3802 | |
41702fec | 3803 | // for(Int_t isum = 0; isum < 5; isum++) |
3804 | // printf("fSums[%d] = %f\n", isum, fSums[isum]); | |
3805 | // printf("denominator = %f\n", denominator); | |
903326c1 | 3806 | fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/det; |
3807 | fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det; | |
41702fec | 3808 | // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]); |
3809 | ||
3810 | // Covariance matrix | |
0323ef61 | 3811 | Double_t den = fSums[0]*fSums[4] - fSums[1]*fSums[1]; |
3812 | fCovarianceMatrix[0] = fSums[4] / den; | |
3813 | fCovarianceMatrix[1] = fSums[0] / den; | |
3814 | fCovarianceMatrix[2] = -fSums[1] / den; | |
3815 | /* fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]); | |
2ed81ab2 | 3816 | fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]); |
0323ef61 | 3817 | fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);*/ |
3818 | ||
3819 | ||
3820 | ||
903326c1 | 3821 | return kTRUE; |
8acca6a3 | 3822 | } |
3823 | ||
46b6abd7 | 3824 | //_____________________________________________________________________________ |
4d6aee34 | 3825 | Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const { |
41702fec | 3826 | // |
3827 | // Returns the Function value of the fitted function at a given x-position | |
3828 | // | |
3829 | return fParams[0] + fParams[1] * (*xpos); | |
46b6abd7 | 3830 | } |
3831 | ||
3832 | //_____________________________________________________________________________ | |
3833 | void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const { | |
41702fec | 3834 | // |
3835 | // Copies the values of the covariance matrix into the storage | |
3836 | // | |
3837 | memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3); | |
46b6abd7 | 3838 | } |
3839 | ||
6e39bde4 | 3840 | //_____________________________________________________________________________ |
3841 | void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){ | |
3842 | // | |
3843 | // Reset the fitter | |
3844 | // | |
3845 | memset(fParams, 0, sizeof(Double_t) * 2); | |
3846 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); | |
3847 | memset(fSums, 0, sizeof(Double_t) * 6); | |
3848 | } | |
3849 | ||
3850 | /////////////////////////////////////////////////////// | |
3851 | // // | |
3852 | // Resources of class AliTRDtrackFitterRieman // | |
3853 | // // | |
3854 | /////////////////////////////////////////////////////// | |
3855 | ||
3856 | //_____________________________________________________________________________ | |
3857 | AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman(): | |
3858 | fTrackFitter(NULL), | |
3859 | fZfitter(NULL), | |
3860 | fCovarPolY(NULL), | |
3861 | fCovarPolZ(NULL), | |
3862 | fXref(0.), | |
3863 | fSysClusterError(0.) | |
3864 | { | |
3865 | // | |
3866 | // Default constructor | |
3867 | // | |
3868 | fZfitter = new AliTRDLeastSquare; | |
3869 | fCovarPolY = new TMatrixD(3,3); | |
3870 | fCovarPolZ = new TMatrixD(2,2); | |
3871 | memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6); | |
3872 | memset(fParameters, 0, sizeof(Double_t) * 5); | |
3873 | memset(fSumPolY, 0, sizeof(Double_t) * 5); | |
3874 | memset(fSumPolZ, 0, sizeof(Double_t) * 2); | |
3875 | } | |
3876 | ||
3877 | //_____________________________________________________________________________ | |
3878 | AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){ | |
3879 | // | |
3880 | // Destructor | |
3881 | // | |
3882 | if(fZfitter) delete fZfitter; | |
3883 | if(fCovarPolY) delete fCovarPolY; | |
3884 | if(fCovarPolZ) delete fCovarPolZ; | |
3885 | } | |
3886 | ||
3887 | //_____________________________________________________________________________ | |
3888 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){ | |
3889 | // | |
3890 | // Reset the Fitter | |
3891 | // | |
3892 | if(fTrackFitter){ | |
3893 | fTrackFitter->StoreData(kTRUE); | |
3894 | fTrackFitter->ClearPoints(); | |
3895 | } | |
3896 | if(fZfitter){ | |
3897 | fZfitter->Reset(); | |
3898 | } | |
3899 | fXref = 0.; | |
3900 | memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer); | |
3901 | memset(fParameters, 0, sizeof(Double_t) * 5); | |
3902 | memset(fSumPolY, 0, sizeof(Double_t) * 5); | |
3903 | memset(fSumPolZ, 0, sizeof(Double_t) * 2); | |
3904 | for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++) | |
3905 | for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){ | |
3906 | (*fCovarPolY)(irow, icol) = 0.; | |
3907 | if(irow < 2 && icol < 2) | |
3908 | (*fCovarPolZ)(irow, icol) = 0.; | |
3909 | } | |
3910 | } | |
3911 | ||
3912 | //_____________________________________________________________________________ | |
3913 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){ | |
3914 | // | |
3915 | // Add tracklet into the fitter | |
3916 | // | |
3917 | if(itr >= AliTRDgeometry::kNlayer) return; | |
3918 | fTracklets[itr] = tracklet; | |
3919 | } | |
3920 | ||
3921 | //_____________________________________________________________________________ | |
3922 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){ | |
3923 | // | |
3924 | // Perform the fit | |
3925 | // 1. Apply linear transformation and store points in the fitter | |
3926 | // 2. Evaluate the fit | |
3927 | // 3. Check if the result of the fit in z-direction is reasonable | |
3928 | // if not | |
3929 | // 3a. Fix the parameters 3 and 4 with the results of a simple least | |
3930 | // square fit | |
3931 | // 3b. Redo the fit with the fixed parameters | |
3932 | // 4. Store fit results (parameters and errors) | |
3933 | // | |
3934 | if(!fTrackFitter){ | |
3935 | return 1e10; | |
3936 | } | |
3937 | fXref = CalculateReferenceX(); | |
3938 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]); | |
3939 | if(!fTrackFitter->GetNpoints()) return 1e10; | |
3940 | // perform the fit | |
3941 | fTrackFitter->Eval(); | |
3942 | fZfitter->Eval(); | |
3943 | fParameters[3] = fTrackFitter->GetParameter(3); | |
3944 | fParameters[4] = fTrackFitter->GetParameter(4); | |
3945 | if(!CheckAcceptable(fParameters[3], fParameters[4])) { | |
3946 | fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref)); | |
3947 | fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1)); | |
3948 | fTrackFitter->Eval(); | |
3949 | fTrackFitter->ReleaseParameter(3); | |
3950 | fTrackFitter->ReleaseParameter(4); | |
3951 | fParameters[3] = fTrackFitter->GetParameter(3); | |
3952 | fParameters[4] = fTrackFitter->GetParameter(4); | |
3953 | } | |
3954 | // Update the Fit Parameters and the errors | |
3955 | fParameters[0] = fTrackFitter->GetParameter(0); | |
3956 | fParameters[1] = fTrackFitter->GetParameter(1); | |
3957 | fParameters[2] = fTrackFitter->GetParameter(2); | |
3958 | ||
3959 | // Prepare Covariance estimation | |
3960 | (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4]; | |
3961 | (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1]; | |
3962 | (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2]; | |
3963 | (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3]; | |
3964 | fCovarPolY->Invert(); | |
3965 | (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2]; | |
3966 | (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1]; | |
3967 | fCovarPolZ->Invert(); | |
3968 | return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints(); | |
3969 | } | |
3970 | ||
3971 | //_____________________________________________________________________________ | |
4d6aee34 | 3972 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(AliTRDseedV1 * const tracklet){ |
6e39bde4 | 3973 | // |
3974 | // Does the transformations and updates the fitters | |
3975 | // The following transformation is applied | |
3976 | // | |
3977 | AliTRDcluster *cl = NULL; | |
3978 | Double_t x, y, z, dx, t, w, we, yerr, zerr; | |
3979 | Double_t uvt[4]; | |
3980 | if(!tracklet || !tracklet->IsOK()) return; | |
3981 | Double_t tilt = tracklet->GetTilt(); | |
3982 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ | |
3983 | if(!(cl = tracklet->GetClusters(itb))) continue; | |
3984 | if(!cl->IsInChamber()) continue; | |
3985 | if (!tracklet->IsUsable(itb)) continue; | |
3986 | x = cl->GetX(); | |
3987 | y = cl->GetY(); | |
3988 | z = cl->GetZ(); | |
3989 | dx = x - fXref; | |
3990 | // Transformation | |
3991 | t = 1./(x*x + y*y); | |
3992 | uvt[0] = 2. * x * t; | |
3993 | uvt[1] = t; | |
3994 | uvt[2] = 2. * tilt * t; | |
3995 | uvt[3] = 2. * tilt * dx * t; | |
3996 | w = 2. * (y + tilt*z) * t; | |
3997 | // error definition changes for the different calls | |
3998 | we = 2. * t; | |
3999 | we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()); | |
4000 | // Update sums for error calculation | |
4001 | yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError); | |
4002 | yerr *= yerr; | |
4003 | zerr = 1./cl->GetSigmaZ2(); | |
4004 | for(Int_t ipol = 0; ipol < 5; ipol++){ | |
4005 | fSumPolY[ipol] += yerr; | |
4006 | yerr *= x; | |
4007 | if(ipol < 3){ | |
4008 | fSumPolZ[ipol] += zerr; | |
4009 | zerr *= x; | |
4010 | } | |
4011 | } | |
4012 | fTrackFitter->AddPoint(uvt, w, we); | |
4013 | fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
4014 | } | |
4015 | } | |
4016 | ||
4017 | //_____________________________________________________________________________ | |
4018 | Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){ | |
4019 | // | |
4020 | // Check whether z-results are acceptable | |
4021 | // Definition: Distance between tracklet fit and track fit has to be | |
4022 | // less then half a padlength | |
4023 | // Point of comparision is at the anode wire | |
4024 | // | |
4025 | Bool_t acceptablez = kTRUE; | |
4026 | Double_t zref = 0.0; | |
4027 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
4028 | if(!fTracklets[iLayer]->IsOK()) continue; | |
4029 | zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref); | |
4030 | if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0) | |
4031 | acceptablez = kFALSE; | |
4032 | } | |
4033 | return acceptablez; | |
4034 | } | |
4035 | ||
4036 | //_____________________________________________________________________________ | |
4037 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const { | |
4038 | // | |
4039 | // Calculate y position out of the track parameters | |
4040 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
4041 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
4042 | // R = Sqrt() = 1/Curvature | |
4043 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
4044 | // | |
4045 | Double_t y = 0; | |
4046 | Double_t disc = (x * fParameters[0] + fParameters[1]); | |
4047 | disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc; | |
4048 | if (disc >= 0) { | |
4049 | disc = TMath::Sqrt(disc); | |
4050 | y = (1.0 - disc) / fParameters[0]; | |
4051 | } | |
4052 | return y; | |
4053 | } | |
4054 | ||
4055 | //_____________________________________________________________________________ | |
4056 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const { | |
4057 | // | |
4058 | // Return z position for a given x position | |
4059 | // Simple linear function | |
4060 | // | |
4061 | return fParameters[3] + fParameters[4] * (x - fXref); | |
4062 | } | |
4063 | ||
4064 | //_____________________________________________________________________________ | |
4065 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const { | |
4066 | // | |
4067 | // Calculate dydx at a given radial position out of the track parameters | |
4068 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
4069 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
4070 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
4071 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
4072 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
4073 | // | |
4074 | Double_t x0 = -fParameters[1] / fParameters[0]; | |
4075 | Double_t curvature = GetCurvature(); | |
4076 | Double_t dy = 0; | |
4077 | if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) { | |
4078 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
4079 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); | |
4080 | if (fParameters[0] < 0) yderiv *= -1.0; | |
4081 | dy = yderiv; | |
4082 | } | |
4083 | } | |
4084 | return dy; | |
4085 | } | |
4086 | ||
4087 | //_____________________________________________________________________________ | |
4088 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const { | |
4089 | // | |
4090 | // Calculate track curvature | |
4091 | // | |
4092 | // | |
4093 | Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0]; | |
4094 | if (curvature > 0.0) | |
4095 | curvature = fParameters[0] / TMath::Sqrt(curvature); | |
4096 | return curvature; | |
4097 | } | |
4098 | ||
4099 | //_____________________________________________________________________________ | |
4100 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const { | |
4101 | // | |
4102 | // Error Definition according to gauss error propagation | |
4103 | // | |
4104 | TMatrixD transform(3,3); | |
4105 | transform(0,0) = transform(1,1) = transform(2,2) = 1; | |
4106 | transform(0,1) = transform(1,2) = x; | |
4107 | transform(0,2) = x*x; | |
4108 | TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY); | |
4109 | covariance *= transform.T(); | |
4110 | cov[0] = covariance(0,0); | |
4111 | TMatrixD transformZ(2,2); | |
4112 | transformZ(0,0) = transformZ(1,1) = 1; | |
4113 | transformZ(0,1) = x; | |
4114 | TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ); | |
4115 | covarZ *= transformZ.T(); | |
4116 | cov[1] = covarZ(0,0); | |
4117 | cov[2] = 0; | |
4118 | } | |
4119 | ||
4120 | //____________________________________________________________________ | |
4121 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){ | |
4122 | // | |
4123 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
4124 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
4125 | // are taken into account | |
4126 | // | |
4127 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
4128 | // | |
4129 | // Output: - The reference x-position(Float_t) | |
4130 | // | |
4131 | Int_t nDistances = 0; | |
4132 | Float_t meanDistance = 0.; | |
4133 | Int_t startIndex = 5; | |
4134 | for(Int_t il =5; il > 0; il--){ | |
4135 | if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){ | |
4136 | Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0(); | |
4137 | meanDistance += xdiff; | |
4138 | nDistances++; | |
4139 | } | |
4140 | if(fTracklets[il]->IsOK()) startIndex = il; | |
4141 | } | |
4142 | if(fTracklets[0]->IsOK()) startIndex = 0; | |
4143 | if(!nDistances){ | |
4144 | // We should normally never get here | |
4145 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
4146 | Int_t iok = 0, idiff = 0; | |
4147 | // This attempt is worse and should be avoided: | |
4148 | // check for two chambers which are OK and repeat this without taking the mean value | |
4149 | // Strategy avoids a division by 0; | |
4150 | for(Int_t il = 5; il >= 0; il--){ | |
4151 | if(fTracklets[il]->IsOK()){ | |
4152 | xpos[iok] = fTracklets[il]->GetX0(); | |
4153 | iok++; | |
4154 | startIndex = il; | |
4155 | } | |
4156 | if(iok) idiff++; // to get the right difference; | |
4157 | if(iok > 1) break; | |
4158 | } | |
4159 | if(iok > 1){ | |
4160 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
4161 | } | |
4162 | else{ | |
4163 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
4164 | return 331.; | |
4165 | } | |
4166 | } | |
4167 | else{ | |
4168 | meanDistance /= nDistances; | |
4169 | } | |
4170 | return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
4171 | } |