]>
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" | |
e4f2f73d | 52 | #include "AliTRDseedV1.h" |
0906e73e | 53 | #include "AliTRDtrackV1.h" |
bb56afff | 54 | #include "AliTRDtrackerV1.h" |
55 | #include "AliTRDtrackerDebug.h" | |
56 | #include "AliTRDtrackingChamber.h" | |
57 | #include "AliTRDchamberTimeBin.h" | |
58 | ||
e4f2f73d | 59 | ClassImp(AliTRDtrackerV1) |
eb38ed55 | 60 | |
eb38ed55 | 61 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // |
62 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // | |
63 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // | |
64 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle | |
65 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation | |
d76231c8 | 66 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
6e39bde4 | 67 | 0.5112, 0.5112, 0.5112, 0.0786, 0.0786, |
41702fec | 68 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, |
69 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 | |
e165b64b | 70 | }; |
71 | const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = { | |
72 | 300.2, 312.8, 325.4, 338.0, 350.6, 363.2}; | |
2985ffcb | 73 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
4d6aee34 | 74 | AliRieman* AliTRDtrackerV1::fgRieman = NULL; |
75 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL; | |
76 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL; | |
e4f2f73d | 77 | |
78 | //____________________________________________________________________ | |
3a039a31 | 79 | AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec) |
41702fec | 80 | :AliTracker() |
4d6aee34 | 81 | ,fkReconstructor(NULL) |
82 | ,fGeom(NULL) | |
83 | ,fClusters(NULL) | |
84 | ,fTracklets(NULL) | |
85 | ,fTracks(NULL) | |
41702fec | 86 | ,fSieveSeeding(0) |
e4f2f73d | 87 | { |
41702fec | 88 | // |
89 | // Default constructor. | |
90 | // | |
eb2b4f91 | 91 | |
92 | SetReconstructor(rec); // initialize reconstructor | |
93 | ||
94 | // initialize geometry | |
95 | if(!AliGeomManager::GetGeometry()){ | |
96 | AliFatal("Could not get geometry."); | |
97 | } | |
98 | fGeom = new AliTRDgeometry(); | |
99 | fGeom->CreateClusterMatrixArray(); | |
4d6aee34 | 100 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 101 | Double_t loc[] = {0., 0., 0.}; |
102 | Double_t glb[] = {0., 0., 0.}; | |
103 | for(Int_t ily=kNPlanes; ily--;){ | |
e165b64b | 104 | Int_t ism = 0; |
105 | while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++; | |
106 | if(!matrix){ | |
107 | AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily)); | |
108 | fR[ily] = fgkX0[ily]; | |
eb2b4f91 | 109 | continue; |
110 | } | |
111 | matrix->LocalToMaster(loc, glb); | |
112 | fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); | |
113 | } | |
114 | ||
115 | // initialize calibration values | |
4d6aee34 | 116 | AliTRDcalibDB *trd = NULL; |
a7ac01d2 | 117 | if (!(trd = AliTRDcalibDB::Instance())) { |
eb2b4f91 | 118 | AliFatal("Could not get calibration."); |
41702fec | 119 | } |
a7ac01d2 | 120 | if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins(); |
41702fec | 121 | |
eb2b4f91 | 122 | // initialize cluster containers |
053767a4 | 123 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
3a039a31 | 124 | |
eb2b4f91 | 125 | // initialize arrays |
126 | memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t)); | |
127 | memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t)); | |
128 | memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*)); | |
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]; |
41702fec | 142 | if(fTracks) {fTracks->Delete(); delete fTracks;} |
143 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} | |
48f8adf3 | 144 | if(fClusters) { |
145 | fClusters->Delete(); delete fClusters; | |
146 | } | |
41702fec | 147 | if(fGeom) delete fGeom; |
e4f2f73d | 148 | } |
149 | ||
150 | //____________________________________________________________________ | |
151 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) | |
152 | { | |
41702fec | 153 | // |
154 | // Steering stand alone tracking for full TRD detector | |
155 | // | |
156 | // Parameters : | |
157 | // esd : The ESD event. On output it contains | |
158 | // the ESD tracks found in TRD. | |
159 | // | |
160 | // Output : | |
161 | // Number of tracks found in the TRD detector. | |
162 | // | |
163 | // Detailed description | |
164 | // 1. Launch individual SM trackers. | |
165 | // See AliTRDtrackerV1::Clusters2TracksSM() for details. | |
166 | // | |
167 | ||
4d6aee34 | 168 | if(!fkReconstructor->GetRecoParam() ){ |
3a039a31 | 169 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); |
41702fec | 170 | return 0; |
171 | } | |
172 | ||
173 | //AliInfo("Start Track Finder ..."); | |
174 | Int_t ntracks = 0; | |
053767a4 | 175 | for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){ |
41702fec | 176 | // for(int ism=1; ism<2; ism++){ |
177 | //AliInfo(Form("Processing supermodule %i ...", ism)); | |
178 | ntracks += Clusters2TracksSM(ism, esd); | |
179 | } | |
180 | AliInfo(Form("Number of found tracks : %d", ntracks)); | |
181 | return ntracks; | |
e4f2f73d | 182 | } |
183 | ||
0906e73e | 184 | |
185 | //_____________________________________________________________________________ | |
eb38ed55 | 186 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
0906e73e | 187 | { |
41702fec | 188 | //AliInfo(Form("Asking for tracklet %d", index)); |
189 | ||
84eab75a | 190 | // reset position of the point before using it |
191 | p.SetXYZ(0., 0., 0.); | |
2f7514a6 | 192 | AliTRDseedV1 *tracklet = GetTracklet(index); |
193 | if (!tracklet) return kFALSE; | |
84eab75a | 194 | |
41702fec | 195 | // get detector for this tracklet |
e165b64b | 196 | Int_t det = tracklet->GetDetector(); |
197 | Int_t sec = fGeom->GetSector(det); | |
198 | Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(), | |
199 | sinA = TMath::Sin(alpha), | |
200 | cosA = TMath::Cos(alpha); | |
41702fec | 201 | Double_t local[3]; |
e165b64b | 202 | local[0] = tracklet->GetX(); |
203 | local[1] = tracklet->GetY(); | |
204 | local[2] = tracklet->GetZ(); | |
41702fec | 205 | Double_t global[3]; |
e165b64b | 206 | fGeom->RotateBack(det, local, global); |
207 | ||
208 | Double_t cov2D[3]; Float_t cov[6]; | |
209 | tracklet->GetCovAt(local[0], cov2D); | |
210 | cov[0] = cov2D[0]*sinA*sinA; | |
211 | cov[1] =-cov2D[0]*sinA*cosA; | |
212 | cov[2] =-cov2D[1]*sinA; | |
213 | cov[3] = cov2D[0]*cosA*cosA; | |
214 | cov[4] = cov2D[1]*cosA; | |
215 | cov[5] = cov2D[2]; | |
216 | // store the global position of the tracklet and its covariance matrix in the track point | |
217 | p.SetXYZ(global[0],global[1],global[2], cov); | |
41702fec | 218 | |
219 | // setting volume id | |
e165b64b | 220 | AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det)); |
221 | Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det); | |
41702fec | 222 | UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId); |
223 | p.SetVolumeID(volid); | |
224 | ||
225 | return kTRUE; | |
0906e73e | 226 | } |
227 | ||
eb38ed55 | 228 | //____________________________________________________________________ |
229 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() | |
230 | { | |
41702fec | 231 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); |
232 | return fgTiltedRieman; | |
eb38ed55 | 233 | } |
0906e73e | 234 | |
eb38ed55 | 235 | //____________________________________________________________________ |
236 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() | |
237 | { | |
41702fec | 238 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); |
239 | return fgTiltedRiemanConstrained; | |
eb38ed55 | 240 | } |
41702fec | 241 | |
eb38ed55 | 242 | //____________________________________________________________________ |
243 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() | |
244 | { | |
fac58f00 | 245 | if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer); |
41702fec | 246 | return fgRieman; |
eb38ed55 | 247 | } |
41702fec | 248 | |
0906e73e | 249 | //_____________________________________________________________________________ |
250 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) | |
251 | { | |
2a3191bb | 252 | // Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building |
253 | // a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points, | |
254 | // covariance, PID, etc.) are than used to update the corresponding ESD track. | |
255 | // Each track seed is first propagated to the geometrical limit of the TRD detector. | |
256 | // Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are | |
257 | // constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated. | |
258 | // Otherwise the ESD track is left unchanged. | |
259 | // | |
260 | // The following steps are performed: | |
261 | // 1. Selection of tracks based on the variance in the y-z plane. | |
262 | // 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set. | |
263 | // 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking | |
264 | // the following status bits: | |
265 | // - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume | |
266 | // - AliESDtrack::kTRDStop - if the tracks fails propagation | |
267 | // - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting | |
268 | // 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout. | |
269 | // 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set. | |
270 | // | |
271 | ||
272 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor | |
41702fec | 273 | if (!calibra) AliInfo("Could not get Calibra instance\n"); |
274 | ||
eb2b4f91 | 275 | // Define scalers |
276 | Int_t nFound = 0, // number of tracks found | |
277 | nSeeds = 0, // total number of ESD seeds | |
278 | nTRDseeds= 0, // number of seeds in the TRD acceptance | |
279 | nTPCseeds= 0; // number of TPC seeds | |
41702fec | 280 | Float_t foundMin = 20.0; |
281 | ||
4d6aee34 | 282 | Float_t *quality = NULL; |
283 | Int_t *index = NULL; | |
eb2b4f91 | 284 | nSeeds = event->GetNumberOfTracks(); |
285 | // Sort tracks according to quality | |
286 | // (covariance in the yz plane) | |
287 | if(nSeeds){ | |
288 | quality = new Float_t[nSeeds]; | |
289 | index = new Int_t[nSeeds]; | |
290 | for (Int_t iSeed = nSeeds; iSeed--;) { | |
d611c74f | 291 | AliESDtrack *seed = event->GetTrack(iSeed); |
292 | Double_t covariance[15]; | |
293 | seed->GetExternalCovariance(covariance); | |
294 | quality[iSeed] = covariance[0] + covariance[2]; | |
295 | } | |
eb2b4f91 | 296 | TMath::Sort(nSeeds, quality, index,kFALSE); |
41702fec | 297 | } |
41702fec | 298 | |
eb2b4f91 | 299 | // Propagate all seeds |
41702fec | 300 | Int_t expectedClr; |
301 | AliTRDtrackV1 track; | |
eb2b4f91 | 302 | for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) { |
41702fec | 303 | |
304 | // Get the seeds in sorted sequence | |
305 | AliESDtrack *seed = event->GetTrack(index[iSeed]); | |
eb2b4f91 | 306 | Float_t p4 = seed->GetC(seed->GetBz()); |
41702fec | 307 | |
308 | // Check the seed status | |
309 | ULong_t status = seed->GetStatus(); | |
310 | if ((status & AliESDtrack::kTPCout) == 0) continue; | |
311 | if ((status & AliESDtrack::kTRDout) != 0) continue; | |
eb2b4f91 | 312 | |
313 | // Propagate to the entrance in the TRD mother volume | |
41702fec | 314 | new(&track) AliTRDtrackV1(*seed); |
eb2b4f91 | 315 | if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){ |
316 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
317 | continue; | |
318 | } | |
319 | if(!AdjustSector(&track)){ | |
320 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
321 | continue; | |
322 | } | |
323 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) { | |
324 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
325 | continue; | |
326 | } | |
327 | ||
328 | nTPCseeds++; | |
e4d4864b | 329 | |
eb2b4f91 | 330 | // store track status at TRD entrance |
76b60503 | 331 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
ae3fbe1f | 332 | |
eb2b4f91 | 333 | // prepare track and do propagation in the TRD |
4d6aee34 | 334 | track.SetReconstructor(fkReconstructor); |
eb2b4f91 | 335 | track.SetKink(Bool_t(seed->GetKinkIndex(0))); |
336 | expectedClr = FollowBackProlongation(track); | |
337 | // check if track entered the TRD fiducial volume | |
338 | if(track.GetTrackLow()){ | |
339 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); | |
340 | nTRDseeds++; | |
341 | } | |
342 | // check if track was stopped in the TRD | |
343 | if (expectedClr<0){ | |
344 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
345 | continue; | |
346 | } | |
ae3fbe1f | 347 | |
348 | if(expectedClr){ | |
eb2b4f91 | 349 | nFound++; |
41702fec | 350 | // computes PID for track |
351 | track.CookPID(); | |
352 | // update calibration references using this track | |
353 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); | |
354 | // save calibration object | |
4d6aee34 | 355 | if (fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
224f357f | 356 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); |
357 | calibTrack->SetOwner(); | |
358 | seed->AddCalibObject(calibTrack); | |
359 | } | |
360 | //update ESD track | |
41702fec | 361 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { |
2389e96f | 362 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
41702fec | 363 | track.UpdateESDtrack(seed); |
41702fec | 364 | } |
365 | } | |
366 | ||
27fbeba8 | 367 | if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) { |
e3cf3d02 | 368 | |
41702fec | 369 | // Make backup for back propagation |
41702fec | 370 | Int_t foundClr = track.GetNumberOfClusters(); |
371 | if (foundClr >= foundMin) { | |
41702fec | 372 | track.CookLabel(1. - fgkLabelFraction); |
f29f13a6 | 373 | //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); |
41702fec | 374 | |
375 | // Sign only gold tracks | |
376 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { | |
f29f13a6 | 377 | //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track); |
41702fec | 378 | } |
379 | Bool_t isGold = kFALSE; | |
380 | ||
381 | // Full gold track | |
382 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { | |
383 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
384 | ||
385 | isGold = kTRUE; | |
386 | } | |
387 | ||
388 | // Almost gold track | |
389 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { | |
390 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); | |
391 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
392 | ||
393 | isGold = kTRUE; | |
394 | } | |
395 | ||
396 | if ((!isGold) && (track.GetBackupTrack())) { | |
397 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { | |
398 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
399 | isGold = kTRUE; | |
400 | } | |
401 | } | |
41702fec | 402 | } |
403 | } | |
404 | ||
eb2b4f91 | 405 | // Propagation to the TOF |
406 | if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) { | |
407 | Int_t sm = track.GetSector(); | |
408 | // default value in case we have problems with the geometry. | |
409 | Double_t xtof = 371.; | |
410 | //Calculate radial position of the beginning of the TOF | |
411 | //mother volume. In order to avoid mixing of the TRD | |
412 | //and TOF modules some hard values are needed. This are: | |
413 | //1. The path to the TOF module. | |
414 | //2. The width of the TOF (29.05 cm) | |
415 | //(with the help of Annalisa de Caro Mar-17-2009) | |
416 | if(gGeoManager){ | |
417 | gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm)); | |
4d6aee34 | 418 | TGeoHMatrix *m = NULL; |
eb2b4f91 | 419 | Double_t loc[]={0., 0., -.5*29.05}, glob[3]; |
420 | ||
421 | if((m=gGeoManager->GetCurrentMatrix())){ | |
422 | m->LocalToMaster(loc, glob); | |
423 | xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]); | |
424 | } | |
41702fec | 425 | } |
672b48bd | 426 | if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){ |
427 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
428 | continue; | |
429 | } | |
430 | if(!AdjustSector(&track)){ | |
431 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
432 | continue; | |
433 | } | |
434 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){ | |
435 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
436 | continue; | |
437 | } | |
eb2b4f91 | 438 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
439 | // TODO obsolete - delete | |
440 | seed->SetTRDQuality(track.StatusForTOF()); | |
41702fec | 441 | } |
41702fec | 442 | seed->SetTRDBudget(track.GetBudget(0)); |
443 | } | |
d611c74f | 444 | if(index) delete [] index; |
445 | if(quality) delete [] quality; | |
41702fec | 446 | |
d4cf71ca | 447 | AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds)); |
448 | AliInfo(Form("Number of tracks: TRDout[%d]", nFound)); | |
449 | ||
d611c74f | 450 | // run stand alone tracking |
4d6aee34 | 451 | if (fkReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec | 452 | |
453 | return 0; | |
0906e73e | 454 | } |
455 | ||
456 | ||
457 | //____________________________________________________________________ | |
458 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) | |
459 | { | |
41702fec | 460 | // |
461 | // Refits tracks within the TRD. The ESD event is expected to contain seeds | |
462 | // at the outer part of the TRD. | |
463 | // The tracks are propagated to the innermost time bin | |
464 | // of the TRD and the ESD event is updated | |
465 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) | |
466 | // | |
467 | ||
468 | Int_t nseed = 0; // contor for loaded seeds | |
469 | Int_t found = 0; // contor for updated TRD tracks | |
470 | ||
471 | ||
472 | AliTRDtrackV1 track; | |
473 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { | |
474 | AliESDtrack *seed = event->GetTrack(itrack); | |
475 | new(&track) AliTRDtrackV1(*seed); | |
476 | ||
477 | if (track.GetX() < 270.0) { | |
478 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
479 | continue; | |
480 | } | |
481 | ||
e3cf3d02 | 482 | // reject tracks which failed propagation in the TRD or |
483 | // are produced by the TRD stand alone tracker | |
41702fec | 484 | ULong_t status = seed->GetStatus(); |
e3cf3d02 | 485 | if(!(status & AliESDtrack::kTRDout)) continue; |
486 | if(!(status & AliESDtrack::kTRDin)) continue; | |
41702fec | 487 | nseed++; |
488 | ||
489 | track.ResetCovariance(50.0); | |
490 | ||
491 | // do the propagation and processing | |
492 | Bool_t kUPDATE = kFALSE; | |
493 | Double_t xTPC = 250.0; | |
494 | if(FollowProlongation(track)){ | |
495 | // Prolongate to TPC | |
496 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update | |
e3cf3d02 | 497 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
498 | found++; | |
499 | kUPDATE = kTRUE; | |
500 | } | |
501 | ||
502 | // Update the friend track | |
4d6aee34 | 503 | if (fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
504 | TObject *o = NULL; Int_t ic = 0; | |
505 | AliTRDtrackV1 *calibTrack = NULL; | |
e3cf3d02 | 506 | while((o = seed->GetCalibObject(ic++))){ |
507 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; | |
508 | calibTrack->SetTrackHigh(track.GetTrackHigh()); | |
509 | } | |
41702fec | 510 | } |
e3cf3d02 | 511 | } |
41702fec | 512 | |
513 | // Prolongate to TPC without update | |
514 | if(!kUPDATE) { | |
515 | AliTRDtrackV1 tt(*seed); | |
e3cf3d02 | 516 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup); |
41702fec | 517 | } |
518 | } | |
519 | AliInfo(Form("Number of loaded seeds: %d",nseed)); | |
520 | AliInfo(Form("Number of found tracks from loaded seeds: %d",found)); | |
521 | ||
522 | return 0; | |
0906e73e | 523 | } |
524 | ||
0906e73e | 525 | //____________________________________________________________________ |
526 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) | |
527 | { | |
41702fec | 528 | // Extrapolates the TRD track in the TPC direction. |
529 | // | |
530 | // Parameters | |
531 | // t : the TRD track which has to be extrapolated | |
532 | // | |
533 | // Output | |
534 | // number of clusters attached to the track | |
535 | // | |
536 | // Detailed description | |
537 | // | |
538 | // Starting from current radial position of track <t> this function | |
539 | // extrapolates the track through the 6 TRD layers. The following steps | |
540 | // are being performed for each plane: | |
541 | // 1. prepare track: | |
542 | // a. get plane limits in the local x direction | |
543 | // b. check crossing sectors | |
544 | // c. check track inclination | |
545 | // 2. search tracklet in the tracker list (see GetTracklet() for details) | |
546 | // 3. evaluate material budget using the geo manager | |
547 | // 4. propagate and update track using the tracklet information. | |
548 | // | |
549 | // Debug level 2 | |
550 | // | |
551 | ||
e3cf3d02 | 552 | Bool_t kStoreIn = kTRUE; |
41702fec | 553 | Int_t nClustersExpected = 0; |
e3cf3d02 | 554 | for (Int_t iplane = kNPlanes; iplane--;) { |
41702fec | 555 | Int_t index = 0; |
556 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); | |
557 | if(!tracklet) continue; | |
558 | if(!tracklet->IsOK()) AliWarning("tracklet not OK"); | |
559 | ||
e3cf3d02 | 560 | Double_t x = tracklet->GetX();//GetX0(); |
41702fec | 561 | // reject tracklets which are not considered for inward refit |
562 | if(x > t.GetX()+fgkMaxStep) continue; | |
563 | ||
564 | // append tracklet to track | |
565 | t.SetTracklet(tracklet, index); | |
566 | ||
567 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; | |
568 | if (!AdjustSector(&t)) break; | |
569 | ||
570 | // Start global position | |
571 | Double_t xyz0[3]; | |
572 | t.GetXYZ(xyz0); | |
573 | ||
574 | // End global position | |
575 | Double_t alpha = t.GetAlpha(), y, z; | |
576 | if (!t.GetProlongation(x,y,z)) break; | |
577 | Double_t xyz1[3]; | |
578 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
579 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
580 | xyz1[2] = z; | |
581 | ||
51a23065 | 582 | Double_t length = TMath::Sqrt( |
583 | (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) + | |
584 | (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) + | |
585 | (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2]) | |
586 | ); | |
587 | if(length>0.){ | |
588 | // Get material budget | |
589 | Double_t param[7]; | |
590 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break; | |
591 | Double_t xrho= param[0]*param[4]; | |
592 | Double_t xx0 = param[1]; // Get mean propagation parameters | |
593 | ||
594 | // Propagate and update | |
595 | t.PropagateTo(x, xx0, xrho); | |
596 | if (!AdjustSector(&t)) break; | |
597 | } | |
e3cf3d02 | 598 | if(kStoreIn){ |
599 | t.SetTrackHigh(); | |
600 | kStoreIn = kFALSE; | |
601 | } | |
602 | ||
b72f4eaf | 603 | Double_t cov[3]; tracklet->GetCovAt(x, cov); |
604 | Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()}; | |
605 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); | |
606 | if (chi2 < 1e+10 && t.Update(p, cov, chi2)){ | |
41702fec | 607 | nClustersExpected += tracklet->GetN(); |
608 | } | |
609 | } | |
610 | ||
4d6aee34 | 611 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec | 612 | Int_t index; |
51a23065 | 613 | for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){ |
41702fec | 614 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
615 | if(!tracklet) continue; | |
616 | t.SetTracklet(tracklet, index); | |
617 | } | |
618 | ||
619 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
4d6aee34 | 620 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
eb2b4f91 | 621 | AliTRDtrackV1 track(t); |
622 | track.SetOwner(); | |
41702fec | 623 | cstreamer << "FollowProlongation" |
624 | << "EventNumber=" << eventNumber | |
625 | << "ncl=" << nClustersExpected | |
eb2b4f91 | 626 | << "track.=" << &track |
41702fec | 627 | << "\n"; |
628 | } | |
629 | ||
630 | return nClustersExpected; | |
0906e73e | 631 | |
632 | } | |
633 | ||
634 | //_____________________________________________________________________________ | |
635 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) | |
636 | { | |
afa21247 | 637 | // Extrapolates/Build the TRD track in the TOF direction. |
638 | // | |
639 | // Parameters | |
640 | // t : the TRD track which has to be extrapolated | |
641 | // | |
642 | // Output | |
643 | // number of clusters attached to the track | |
644 | // | |
645 | // Starting from current radial position of track <t> this function | |
646 | // extrapolates the track through the 6 TRD layers. The following steps | |
647 | // are being performed for each plane: | |
648 | // 1. Propagate track to the entrance of the next chamber: | |
649 | // - get chamber limits in the radial direction | |
650 | // - check crossing sectors | |
651 | // - check track inclination | |
652 | // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary()) | |
653 | // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only | |
654 | // Kalman filter is needed and tracklets are already linked to the track this step is skipped. | |
655 | // 3. Fit tracklet using the information from the Kalman filter. | |
656 | // 4. Propagate and update track at reference radial position of the tracklet. | |
657 | // 5. Register tracklet with the tracker and track; update pulls monitoring. | |
658 | // | |
659 | // Observation | |
2a3191bb | 660 | // 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: |
661 | // - AliTRDtrackV1::kProlongation : track prolongation failed | |
662 | // - AliTRDtrackV1::kPropagation : track prolongation failed | |
663 | // - AliTRDtrackV1::kAdjustSector : failed during sector crossing | |
664 | // - AliTRDtrackV1::kSnp : too large bending | |
665 | // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet | |
666 | // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet | |
667 | // - AliTRDtrackV1::kUnknown : anything which is not covered before | |
afa21247 | 668 | // 2. By default the status of the track before first TRD update is saved. |
669 | // | |
670 | // Debug level 2 | |
671 | // | |
672 | // Author | |
673 | // Alexandru Bercuci <A.Bercuci@gsi.de> | |
674 | // | |
41702fec | 675 | |
eb2b4f91 | 676 | Int_t n = 0; |
677 | Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); | |
4d6aee34 | 678 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 679 | |
4d6aee34 | 680 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
181d2c97 | 681 | // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array |
682 | AliTRDseedV1 *tracklets[kNPlanes]; | |
683 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); | |
684 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
685 | tracklets[ip] = t.GetTracklet(ip); | |
686 | t.UnsetTracklet(ip); | |
687 | } | |
81a6494d | 688 | Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE; |
e3cf3d02 | 689 | |
053767a4 | 690 | // Loop through the TRD layers |
4d6aee34 | 691 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 692 | Double_t x, y, z; |
693 | for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) { | |
694 | // rough estimate of the entry point | |
695 | if (!t.GetProlongation(fR[ily], y, z)){ | |
696 | n=-1; | |
697 | t.SetStatus(AliTRDtrackV1::kProlongation); | |
698 | break; | |
699 | } | |
41702fec | 700 | |
eb2b4f91 | 701 | // find sector / stack / detector |
702 | sm = t.GetSector(); | |
703 | // TODO cross check with y value ! | |
704 | stk = fGeom->GetStack(z, ily); | |
705 | det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1; | |
4d6aee34 | 706 | matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL; |
eb2b4f91 | 707 | |
708 | // check if supermodule/chamber is installed | |
709 | if( !fGeom->GetSMstatus(sm) || | |
710 | stk<0. || | |
711 | fGeom->IsHole(ily, stk, sm) || | |
712 | !matrix ){ | |
713 | // propagate to the default radial position | |
714 | if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){ | |
715 | n=-1; | |
716 | t.SetStatus(AliTRDtrackV1::kPropagation); | |
41702fec | 717 | break; |
718 | } | |
eb2b4f91 | 719 | if(!AdjustSector(&t)){ |
720 | n=-1; | |
721 | t.SetStatus(AliTRDtrackV1::kAdjustSector); | |
722 | break; | |
723 | } | |
724 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){ | |
725 | n=-1; | |
726 | t.SetStatus(AliTRDtrackV1::kSnp); | |
727 | break; | |
728 | } | |
729 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); | |
41702fec | 730 | continue; |
731 | } | |
e3cf3d02 | 732 | |
eb2b4f91 | 733 | // retrieve rotation matrix for the current chamber |
734 | Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.}; | |
735 | Double_t glb[] = {0., 0., 0.}; | |
736 | matrix->LocalToMaster(loc, glb); | |
737 | ||
738 | // Propagate to the radial distance of the current layer | |
739 | x = glb[0] - fgkMaxStep; | |
740 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){ | |
741 | n=-1; | |
742 | t.SetStatus(AliTRDtrackV1::kPropagation); | |
743 | break; | |
744 | } | |
745 | if(!AdjustSector(&t)){ | |
746 | n=-1; | |
747 | t.SetStatus(AliTRDtrackV1::kAdjustSector); | |
748 | break; | |
749 | } | |
750 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { | |
751 | n=-1; | |
752 | t.SetStatus(AliTRDtrackV1::kSnp); | |
753 | break; | |
754 | } | |
4d6aee34 | 755 | Bool_t doRecalculate = kFALSE; |
eb2b4f91 | 756 | if(sm != t.GetSector()){ |
757 | sm = t.GetSector(); | |
4d6aee34 | 758 | doRecalculate = kTRUE; |
eb2b4f91 | 759 | } |
760 | if(stk != fGeom->GetStack(z, ily)){ | |
761 | stk = fGeom->GetStack(z, ily); | |
4d6aee34 | 762 | doRecalculate = kTRUE; |
eb2b4f91 | 763 | } |
4d6aee34 | 764 | if(doRecalculate){ |
eb2b4f91 | 765 | det = AliTRDgeometry::GetDetector(ily, stk, sm); |
766 | if(!(matrix = fGeom->GetClusterMatrix(det))){ | |
767 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); | |
768 | continue; | |
769 | } | |
770 | matrix->LocalToMaster(loc, glb); | |
771 | x = glb[0] - fgkMaxStep; | |
772 | } | |
773 | ||
774 | // check if track is well inside fiducial volume | |
775 | if (!t.GetProlongation(x+fgkMaxStep, y, z)) { | |
776 | n=-1; | |
777 | t.SetStatus(AliTRDtrackV1::kProlongation); | |
778 | break; | |
779 | } | |
780 | if(fGeom->IsOnBoundary(det, y, z, .5)){ | |
781 | t.SetStatus(AliTRDtrackV1::kBoundary, ily); | |
782 | continue; | |
783 | } | |
784 | // mark track as entering the FIDUCIAL volume of TRD | |
e3cf3d02 | 785 | if(kStoreIn){ |
786 | t.SetTrackLow(); | |
787 | kStoreIn = kFALSE; | |
788 | } | |
b1957d3c | 789 | |
eb2b4f91 | 790 | ptrTracklet = tracklets[ily]; |
791 | if(!ptrTracklet){ // BUILD TRACKLET | |
792 | // check data in supermodule | |
793 | if(!fTrSec[sm].GetNChambers()){ | |
794 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); | |
795 | continue; | |
796 | } | |
797 | if(fTrSec[sm].GetX(ily) < 1.){ | |
798 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); | |
799 | continue; | |
800 | } | |
801 | ||
802 | // check data in chamber | |
803 | if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){ | |
804 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); | |
805 | continue; | |
806 | } | |
4d6aee34 | 807 | if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){ |
eb2b4f91 | 808 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
809 | continue; | |
810 | } | |
811 | // build tracklet | |
812 | ptrTracklet = new(&tracklet) AliTRDseedV1(det); | |
4d6aee34 | 813 | ptrTracklet->SetReconstructor(fkReconstructor); |
eb2b4f91 | 814 | ptrTracklet->SetKink(t.IsKink()); |
815 | ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk)); | |
816 | ptrTracklet->SetX0(glb[0]+driftLength); | |
817 | if(!tracklet.Init(&t)){ | |
818 | n=-1; | |
819 | t.SetStatus(AliTRDtrackV1::kTrackletInit); | |
820 | break; | |
821 | } | |
822 | if(!tracklet.AttachClusters(chamber, kTRUE)){ | |
823 | t.SetStatus(AliTRDtrackV1::kNoAttach, ily); | |
824 | continue; | |
825 | } | |
4d6aee34 | 826 | if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){ |
eb2b4f91 | 827 | t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily); |
828 | continue; | |
829 | } | |
830 | ptrTracklet->UpdateUsed(); | |
831 | } | |
eb2b4f91 | 832 | // propagate track to the radial position of the tracklet |
833 | ptrTracklet->UseClusters(); // TODO ? do we need this here ? | |
834 | // fit tracklet no tilt correction | |
835 | if(!ptrTracklet->Fit(kFALSE)){ | |
836 | t.SetStatus(AliTRDtrackV1::kNoFit, ily); | |
837 | continue; | |
838 | } | |
839 | x = ptrTracklet->GetX(); //GetX0(); | |
840 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) { | |
841 | n=-1; | |
842 | t.SetStatus(AliTRDtrackV1::kPropagation); | |
843 | break; | |
844 | } | |
845 | if(!AdjustSector(&t)) { | |
846 | n=-1; | |
847 | t.SetStatus(AliTRDtrackV1::kAdjustSector); | |
848 | break; | |
41702fec | 849 | } |
eb2b4f91 | 850 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { |
851 | n=-1; | |
852 | t.SetStatus(AliTRDtrackV1::kSnp); | |
853 | break; | |
854 | } | |
81a6494d | 855 | if(kPropagateIn){ |
856 | t.SetTrackLow(); | |
857 | kPropagateIn = kFALSE; | |
858 | } | |
b72f4eaf | 859 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
860 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; | |
861 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); | |
4d6aee34 | 862 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){ |
6e39bde4 | 863 | Double_t ytrack = ptrTracklet->GetYref(0); |
864 | Double_t ztrack = ptrTracklet->GetZref(0); | |
865 | Double_t ytracklet = ptrTracklet->GetYfit(0); | |
866 | Double_t ztracklet = ptrTracklet->GetZfit(0); | |
867 | Double_t phitrack = ptrTracklet->GetYref(1); | |
868 | Double_t phitracklet = ptrTracklet->GetYfit(1); | |
869 | Double_t thetatrack = ptrTracklet->GetZref(1); | |
870 | Double_t thetatracklet = ptrTracklet->GetZfit(1); | |
871 | ||
4d6aee34 | 872 | TTreeSRedirector &mystreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
6e39bde4 | 873 | mystreamer << "FollowBackProlongation1" |
874 | << "il=" << ily | |
875 | << "x=" << x | |
876 | << "ytrack=" << ytrack | |
877 | << "ztrack=" << ztrack | |
878 | << "ytracklet=" << ytracklet | |
879 | << "ztracklet=" << ztracklet | |
880 | << "phitrack=" << phitrack | |
881 | << "thetatrack=" << thetatrack | |
882 | << "phitracklet=" << phitracklet | |
883 | << "thetatracklet=" << thetatracklet | |
884 | << "chi2=" << chi2 | |
885 | << "\n"; | |
886 | } | |
887 | // update Kalman with the TRD measurement | |
b72f4eaf | 888 | if(chi2>1e+10){ // TODO |
eb2b4f91 | 889 | t.SetStatus(AliTRDtrackV1::kChi2, ily); |
890 | continue; | |
891 | } | |
b72f4eaf | 892 | if(!t.Update(p, cov, chi2)) { |
eb2b4f91 | 893 | n=-1; |
894 | t.SetStatus(AliTRDtrackV1::kUpdate); | |
895 | break; | |
896 | } | |
b72f4eaf | 897 | // fill residuals ?! |
898 | AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId()); | |
899 | ||
eb2b4f91 | 900 | |
901 | // load tracklet to the tracker | |
16cca13f | 902 | ptrTracklet->Update(&t); |
eb2b4f91 | 903 | ptrTracklet = SetTracklet(ptrTracklet); |
904 | t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); | |
905 | n += ptrTracklet->GetN(); | |
906 | ||
41702fec | 907 | // Reset material budget if 2 consecutive gold |
eb2b4f91 | 908 | // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec | 909 | |
910 | // Make backup of the track until is gold | |
911 | // TO DO update quality check of the track. | |
912 | // consider comparison with fTimeBinsRange | |
913 | Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins); | |
914 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); | |
41702fec | 915 | |
eb2b4f91 | 916 | if( (chi2 < 18.0) && |
41702fec | 917 | (ratio0 > 0.8) && |
918 | //(ratio1 > 0.6) && | |
919 | //(ratio0+ratio1 > 1.5) && | |
920 | (t.GetNCross() == 0) && | |
921 | (TMath::Abs(t.GetSnp()) < 0.85) && | |
e3cf3d02 | 922 | (t.GetNumberOfClusters() > 20)){ |
923 | t.MakeBackupTrack(); | |
924 | } | |
053767a4 | 925 | } // end layers loop |
eb2b4f91 | 926 | //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD()); |
927 | //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n"); | |
41702fec | 928 | |
4d6aee34 | 929 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
930 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); | |
41702fec | 931 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
eb2b4f91 | 932 | AliTRDtrackV1 track(t); |
933 | track.SetOwner(); | |
41702fec | 934 | cstreamer << "FollowBackProlongation" |
eb2b4f91 | 935 | << "EventNumber=" << eventNumber |
936 | << "ncl=" << n | |
937 | << "track.=" << &track | |
41702fec | 938 | << "\n"; |
939 | } | |
940 | ||
eb2b4f91 | 941 | return n; |
0906e73e | 942 | } |
943 | ||
eb38ed55 | 944 | //_________________________________________________________________________ |
4d6aee34 | 945 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){ |
41702fec | 946 | // |
947 | // Fits a Riemann-circle to the given points without tilting pad correction. | |
948 | // The fit is performed using an instance of the class AliRieman (equations | |
949 | // and transformations see documentation of this class) | |
950 | // Afterwards all the tracklets are Updated | |
951 | // | |
952 | // Parameters: - Array of tracklets (AliTRDseedV1) | |
953 | // - Storage for the chi2 values (beginning with direction z) | |
954 | // - Seeding configuration | |
955 | // Output: - The curvature | |
956 | // | |
957 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
958 | fitter->Reset(); | |
959 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; | |
960 | Int_t *ppl = &allplanes[0]; | |
961 | Int_t maxLayers = 6; | |
962 | if(planes){ | |
963 | maxLayers = 4; | |
964 | ppl = planes; | |
965 | } | |
966 | for(Int_t il = 0; il < maxLayers; il++){ | |
967 | if(!tracklets[ppl[il]].IsOK()) continue; | |
e3cf3d02 | 968 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10); |
41702fec | 969 | } |
970 | fitter->Update(); | |
971 | // Set the reference position of the fit and calculate the chi2 values | |
972 | memset(chi2, 0, sizeof(Double_t) * 2); | |
973 | for(Int_t il = 0; il < maxLayers; il++){ | |
974 | // Reference positions | |
975 | tracklets[ppl[il]].Init(fitter); | |
976 | ||
977 | // chi2 | |
978 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; | |
979 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); | |
980 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); | |
981 | } | |
982 | return fitter->GetC(); | |
eb38ed55 | 983 | } |
984 | ||
985 | //_________________________________________________________________________ | |
986 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) | |
987 | { | |
41702fec | 988 | // |
989 | // Performs a Riemann helix fit using the seedclusters as spacepoints | |
990 | // Afterwards the chi2 values are calculated and the seeds are updated | |
991 | // | |
992 | // Parameters: - The four seedclusters | |
993 | // - The tracklet array (AliTRDseedV1) | |
994 | // - The seeding configuration | |
995 | // - Chi2 array | |
996 | // | |
997 | // debug level 2 | |
998 | // | |
999 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
1000 | fitter->Reset(); | |
a3743898 | 1001 | for(Int_t i = 0; i < 4; i++){ |
a3743898 | 1002 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.); |
1003 | } | |
41702fec | 1004 | fitter->Update(); |
1005 | ||
1006 | ||
1007 | // Update the seed and calculated the chi2 value | |
1008 | chi2[0] = 0; chi2[1] = 0; | |
1009 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ | |
1010 | // chi2 | |
1011 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); | |
1012 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); | |
1013 | } | |
eb38ed55 | 1014 | } |
1015 | ||
1016 | ||
1017 | //_________________________________________________________________________ | |
1018 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) | |
1019 | { | |
41702fec | 1020 | // |
1021 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is | |
1022 | // assumed that the vertex position is set to 0. | |
1023 | // This method is very usefull for high-pt particles | |
1024 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 | |
1025 | // x0, y0: Center of the circle | |
1026 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) | |
1027 | // zc: center of the pad row | |
1028 | // Equation which has to be fitted (after transformation): | |
1029 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 | |
1030 | // Transformation: | |
1031 | // t = 1/(x^2 + y^2) | |
1032 | // u = 2 * x * t | |
1033 | // v = 2 * x * tan(phiT) * t | |
1034 | // Parameters in the equation: | |
1035 | // a = -1/y0, b = x0/y0, e = dz/dx | |
1036 | // | |
1037 | // The Curvature is calculated by the following equation: | |
1038 | // - curv = a/Sqrt(b^2 + 1) = 1/R | |
1039 | // Parameters: - the 6 tracklets | |
1040 | // - the Vertex constraint | |
1041 | // Output: - the Chi2 value of the track | |
1042 | // | |
1043 | // debug level 5 | |
1044 | // | |
1045 | ||
1046 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); | |
1047 | fitter->StoreData(kTRUE); | |
1048 | fitter->ClearPoints(); | |
4d6aee34 | 1049 | AliTRDcluster *cl = NULL; |
41702fec | 1050 | |
1051 | Float_t x, y, z, w, t, error, tilt; | |
1052 | Double_t uvt[2]; | |
1053 | Int_t nPoints = 0; | |
053767a4 | 1054 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
1055 | if(!tracklets[ilr].IsOK()) continue; | |
8d2bec9e | 1056 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
053767a4 | 1057 | if(!tracklets[ilr].IsUsable(itb)) continue; |
1058 | cl = tracklets[ilr].GetClusters(itb); | |
1742f24c | 1059 | if(!cl->IsInChamber()) continue; |
41702fec | 1060 | x = cl->GetX(); |
1061 | y = cl->GetY(); | |
1062 | z = cl->GetZ(); | |
053767a4 | 1063 | tilt = tracklets[ilr].GetTilt(); |
41702fec | 1064 | // Transformation |
1065 | t = 1./(x * x + y * y); | |
1066 | uvt[0] = 2. * x * t; | |
1067 | uvt[1] = 2. * x * t * tilt ; | |
1068 | w = 2. * (y + tilt * (z - zVertex)) * t; | |
78b7d24c | 1069 | error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t; |
41702fec | 1070 | fitter->AddPoint(uvt, w, error); |
1071 | nPoints++; | |
1072 | } | |
1073 | } | |
1074 | fitter->Eval(); | |
1075 | ||
1076 | // Calculate curvature | |
1077 | Double_t a = fitter->GetParameter(0); | |
1078 | Double_t b = fitter->GetParameter(1); | |
1079 | Double_t curvature = a/TMath::Sqrt(b*b + 1); | |
1080 | ||
1081 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1082 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) | |
e3cf3d02 | 1083 | tracklets[ip].SetC(curvature); |
41702fec | 1084 | |
4d6aee34 | 1085 | /* if(fkReconstructor->GetStreamLevel() >= 5){ |
41702fec | 1086 | //Linear Model on z-direction |
1087 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack | |
1088 | Double_t slope = fitter->GetParameter(2); | |
1089 | Double_t zref = slope * xref; | |
1090 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); | |
1091 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
1092 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 1093 | TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 1094 | treeStreamer << "FitTiltedRiemanConstraint" |
1095 | << "EventNumber=" << eventNumber | |
1096 | << "CandidateNumber=" << candidateNumber | |
1097 | << "Curvature=" << curvature | |
1098 | << "Chi2Track=" << chi2track | |
1099 | << "Chi2Z=" << chi2Z | |
1100 | << "zref=" << zref | |
1101 | << "\n"; | |
3a039a31 | 1102 | }*/ |
41702fec | 1103 | return chi2track; |
eb38ed55 | 1104 | } |
1105 | ||
1106 | //_________________________________________________________________________ | |
1107 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) | |
1108 | { | |
41702fec | 1109 | // |
1110 | // Performs a Riemann fit taking tilting pad correction into account | |
1111 | // The equation of a Riemann circle, where the y position is substituted by the | |
1112 | // measured y-position taking pad tilting into account, has to be transformed | |
1113 | // into a 4-dimensional hyperplane equation | |
1114 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 | |
1115 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) | |
1116 | // zc: center of the pad row | |
1117 | // zt: z-position of the track | |
1118 | // The z-position of the track is assumed to be linear dependent on the x-position | |
1119 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 | |
1120 | // Transformation: u = 2 * x * t | |
1121 | // v = 2 * tan(phiT) * t | |
1122 | // w = 2 * tan(phiT) * (x - xref) * t | |
1123 | // t = 1 / (x^2 + ymeas^2) | |
1124 | // Parameters: a = -1/y0 | |
1125 | // b = x0/y0 | |
1126 | // c = (R^2 -x0^2 - y0^2)/y0 | |
1127 | // d = offset | |
1128 | // e = dz/dx | |
1129 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using | |
1130 | // results from the simple riemann fit. Afterwards the fit is redone. | |
1131 | // The curvature is calculated according to the formula: | |
1132 | // curv = a/(1 + b^2 + c*a) = 1/R | |
1133 | // | |
1134 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1135 | // - Flag selecting the error definition | |
1136 | // Output: - Chi2 values of the track (in Parameter list) | |
1137 | // | |
1138 | TLinearFitter *fitter = GetTiltedRiemanFitter(); | |
1139 | fitter->StoreData(kTRUE); | |
1140 | fitter->ClearPoints(); | |
1141 | AliTRDLeastSquare zfitter; | |
4d6aee34 | 1142 | AliTRDcluster *cl = NULL; |
41702fec | 1143 | |
1144 | Double_t xref = CalculateReferenceX(tracklets); | |
6e39bde4 | 1145 | Double_t x, y, z, t, tilt, dx, w, we, erry, errz; |
1146 | Double_t uvt[4], sumPolY[5], sumPolZ[3]; | |
1147 | memset(sumPolY, 0, sizeof(Double_t) * 5); | |
1148 | memset(sumPolZ, 0, sizeof(Double_t) * 3); | |
41702fec | 1149 | Int_t nPoints = 0; |
1150 | // Containers for Least-square fitter | |
1151 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1152 | if(!tracklets[ipl].IsOK()) continue; | |
ed15ef4f | 1153 | tilt = tracklets[ipl].GetTilt(); |
8d2bec9e | 1154 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec | 1155 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1742f24c | 1156 | if(!cl->IsInChamber()) continue; |
41702fec | 1157 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1158 | x = cl->GetX(); | |
1159 | y = cl->GetY(); | |
1160 | z = cl->GetZ(); | |
41702fec | 1161 | dx = x - xref; |
1162 | // Transformation | |
1163 | t = 1./(x*x + y*y); | |
1164 | uvt[0] = 2. * x * t; | |
1165 | uvt[1] = t; | |
1166 | uvt[2] = 2. * tilt * t; | |
1167 | uvt[3] = 2. * tilt * dx * t; | |
1168 | w = 2. * (y + tilt*z) * t; | |
1169 | // error definition changes for the different calls | |
1170 | we = 2. * t; | |
78b7d24c | 1171 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2; |
41702fec | 1172 | fitter->AddPoint(uvt, w, we); |
1173 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
6e39bde4 | 1174 | // adding points for covariance matrix estimation |
1175 | erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration) | |
1176 | erry *= erry; | |
1177 | errz = 1./cl->GetSigmaZ2(); | |
1178 | for(Int_t ipol = 0; ipol < 5; ipol++){ | |
1179 | sumPolY[ipol] += erry; | |
1180 | erry *= x; | |
1181 | if(ipol < 3){ | |
1182 | sumPolZ[ipol] += errz; | |
1183 | errz *= x; | |
1184 | } | |
1185 | } | |
41702fec | 1186 | nPoints++; |
1187 | } | |
1188 | } | |
1189 | fitter->Eval(); | |
1190 | zfitter.Eval(); | |
1191 | ||
1192 | Double_t offset = fitter->GetParameter(3); | |
1193 | Double_t slope = fitter->GetParameter(4); | |
1194 | ||
1195 | // Linear fitter - not possible to make boundaries | |
1196 | // Do not accept non possible z and dzdx combinations | |
1197 | Bool_t acceptablez = kTRUE; | |
1198 | Double_t zref = 0.0; | |
1199 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1200 | if(!tracklets[iLayer].IsOK()) continue; | |
1201 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1202 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
41702fec | 1203 | acceptablez = kFALSE; |
1204 | } | |
1205 | if (!acceptablez) { | |
1206 | Double_t dzmf = zfitter.GetFunctionParameter(1); | |
1207 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1208 | fgTiltedRieman->FixParameter(3, zmf); | |
1209 | fgTiltedRieman->FixParameter(4, dzmf); | |
1210 | fitter->Eval(); | |
1211 | fitter->ReleaseParameter(3); | |
1212 | fitter->ReleaseParameter(4); | |
1213 | offset = fitter->GetParameter(3); | |
1214 | slope = fitter->GetParameter(4); | |
1215 | } | |
1216 | ||
1217 | // Calculate Curvarture | |
1218 | Double_t a = fitter->GetParameter(0); | |
1219 | Double_t b = fitter->GetParameter(1); | |
1220 | Double_t c = fitter->GetParameter(2); | |
1221 | Double_t curvature = 1.0 + b*b - c*a; | |
1222 | if (curvature > 0.0) | |
1223 | curvature = a / TMath::Sqrt(curvature); | |
1224 | ||
1225 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1226 | ||
6e39bde4 | 1227 | // Prepare error calculation |
1228 | TMatrixD covarPolY(3,3); | |
1229 | covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4]; | |
1230 | covarPolY(0,1) = covarPolY(1,0) = sumPolY[1]; | |
1231 | covarPolY(0,2) = covarPolY(2,0) = sumPolY[2]; | |
1232 | covarPolY(2,1) = covarPolY(1,2) = sumPolY[3]; | |
1233 | covarPolY.Invert(); | |
1234 | TMatrixD covarPolZ(2,2); | |
1235 | covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2]; | |
1236 | covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1]; | |
1237 | covarPolZ.Invert(); | |
1238 | ||
41702fec | 1239 | // Update the tracklets |
6e39bde4 | 1240 | Double_t x1, dy, dz; |
1241 | Double_t cov[15]; | |
1242 | memset(cov, 0, sizeof(Double_t) * 15); | |
41702fec | 1243 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { |
1244 | ||
1245 | x = tracklets[iLayer].GetX0(); | |
6e39bde4 | 1246 | x1 = x - xref; |
41702fec | 1247 | y = 0; |
1248 | z = 0; | |
1249 | dy = 0; | |
1250 | dz = 0; | |
6e39bde4 | 1251 | memset(cov, 0, sizeof(Double_t) * 3); |
1252 | TMatrixD transform(3,3); | |
1253 | transform(0,0) = 1; | |
1254 | transform(0,1) = x; | |
1255 | transform(0,2) = x*x; | |
1256 | transform(1,1) = 1; | |
1257 | transform(1,2) = x; | |
1258 | transform(2,2) = 1; | |
1259 | TMatrixD covariance(transform, TMatrixD::kMult, covarPolY); | |
1260 | covariance *= transform.T(); | |
1261 | TMatrixD transformZ(2,2); | |
1262 | transformZ(0,0) = transformZ(1,1) = 1; | |
1263 | transformZ(0,1) = x; | |
1264 | TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ); | |
1265 | covarZ *= transformZ.T(); | |
41702fec | 1266 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1267 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1268 | // R = Sqrt() = 1/Curvature | |
1269 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
1270 | Double_t res = (x * a + b); // = (x - x0)/y0 | |
1271 | res *= res; | |
1272 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 | |
1273 | if (res >= 0) { | |
1274 | res = TMath::Sqrt(res); | |
1275 | y = (1.0 - res) / a; | |
1276 | } | |
6e39bde4 | 1277 | cov[0] = covariance(0,0); |
1278 | cov[2] = covarZ(0,0); | |
1279 | cov[1] = 0.; | |
41702fec | 1280 | |
1281 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
1282 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
1283 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1284 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
1285 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
1286 | Double_t x0 = -b / a; | |
1287 | if (-c * a + b * b + 1 > 0) { | |
1288 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
6e39bde4 | 1289 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); |
1290 | if (a < 0) yderiv *= -1.0; | |
1291 | dy = yderiv; | |
41702fec | 1292 | } |
1293 | } | |
1294 | z = offset + slope * (x - xref); | |
1295 | dz = slope; | |
1296 | tracklets[iLayer].SetYref(0, y); | |
1297 | tracklets[iLayer].SetYref(1, dy); | |
1298 | tracklets[iLayer].SetZref(0, z); | |
1299 | tracklets[iLayer].SetZref(1, dz); | |
1300 | tracklets[iLayer].SetC(curvature); | |
6e39bde4 | 1301 | tracklets[iLayer].SetCovRef(cov); |
41702fec | 1302 | tracklets[iLayer].SetChi2(chi2track); |
1303 | } | |
1304 | ||
4d6aee34 | 1305 | /* if(fkReconstructor->GetStreamLevel() >=5){ |
1306 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); | |
41702fec | 1307 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1308 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
1309 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); | |
1310 | cstreamer << "FitTiltedRieman0" | |
1311 | << "EventNumber=" << eventNumber | |
1312 | << "CandidateNumber=" << candidateNumber | |
1313 | << "xref=" << xref | |
1314 | << "Chi2Z=" << chi2z | |
1315 | << "\n"; | |
3a039a31 | 1316 | }*/ |
41702fec | 1317 | return chi2track; |
eb38ed55 | 1318 | } |
1319 | ||
3b57a3f7 | 1320 | |
9e333711 | 1321 | //____________________________________________________________________ |
6e4d4425 | 1322 | Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
9e333711 | 1323 | { |
4d6aee34 | 1324 | // |
1325 | // Fit track with a staight line | |
1326 | // Fills an AliTrackPoint array with np points | |
1327 | // Function should be used to refit tracks when no magnetic field was on | |
1328 | // | |
9e333711 | 1329 | AliTRDLeastSquare yfitter, zfitter; |
4d6aee34 | 1330 | AliTRDcluster *cl = NULL; |
9e333711 | 1331 | |
4d6aee34 | 1332 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
9e333711 | 1333 | if(!tracklets){ |
1334 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1335 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1336 | if(!tracklet->IsOK()) continue; | |
1337 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1338 | } | |
1339 | tracklets = &work[0]; | |
1340 | } | |
1341 | ||
1342 | Double_t xref = CalculateReferenceX(tracklets); | |
1343 | Double_t x, y, z, dx, ye, yr, tilt; | |
1344 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1345 | if(!tracklets[ipl].IsOK()) continue; | |
1346 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1347 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1348 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1349 | x = cl->GetX(); | |
1350 | z = cl->GetZ(); | |
1351 | dx = x - xref; | |
1352 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1353 | } | |
1354 | } | |
1355 | zfitter.Eval(); | |
1356 | Double_t z0 = zfitter.GetFunctionParameter(0); | |
1357 | Double_t dzdx = zfitter.GetFunctionParameter(1); | |
1358 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1359 | if(!tracklets[ipl].IsOK()) continue; | |
1360 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1361 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1362 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1363 | x = cl->GetX(); | |
1364 | y = cl->GetY(); | |
1365 | z = cl->GetZ(); | |
1366 | tilt = tracklets[ipl].GetTilt(); | |
1367 | dx = x - xref; | |
1368 | yr = y + tilt*(z - z0 - dzdx*dx); | |
1369 | // error definition changes for the different calls | |
1370 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); | |
1371 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; | |
1372 | yfitter.AddPoint(&dx, yr, ye); | |
1373 | } | |
1374 | } | |
1375 | yfitter.Eval(); | |
1376 | Double_t y0 = yfitter.GetFunctionParameter(0); | |
1377 | Double_t dydx = yfitter.GetFunctionParameter(1); | |
1378 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); | |
1379 | ||
1380 | //update track points array | |
1381 | if(np && points){ | |
1382 | Float_t xyz[3]; | |
1383 | for(int ip=0; ip<np; ip++){ | |
1384 | points[ip].GetXYZ(xyz); | |
1385 | xyz[1] = y0 + dydx * (xyz[0] - xref); | |
1386 | xyz[2] = z0 + dzdx * (xyz[0] - xref); | |
1387 | points[ip].SetXYZ(xyz); | |
1388 | } | |
1389 | } | |
1390 | return chi2; | |
1391 | } | |
1392 | ||
1393 | ||
3b57a3f7 | 1394 | //_________________________________________________________________________ |
6e4d4425 | 1395 | Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
3b57a3f7 | 1396 | { |
0fa1a8ee | 1397 | // |
1398 | // Performs a Riemann fit taking tilting pad correction into account | |
1399 | // | |
1400 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1401 | // - Flag selecting the error definition | |
1402 | // Output: - Chi2 values of the track (in Parameter list) | |
1403 | // | |
1404 | // The equations which has to be solved simultaneously are: | |
1405 | // BEGIN_LATEX | |
1406 | // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2} | |
1407 | // y^{*} = y - tg(h)(z - z_{t}) | |
1408 | // z_{t} = z_{0}+dzdx*(x-x_{r}) | |
1409 | // END_LATEX | |
1410 | // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle, | |
1411 | // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the | |
1412 | // track in the x-z plane. Using the following transformations | |
1413 | // BEGIN_LATEX | |
1414 | // t = 1 / (x^{2} + y^{2}) | |
1415 | // u = 2 * x * t | |
1416 | // v = 2 * tan(h) * t | |
1417 | // w = 2 * tan(h) * (x - x_{r}) * t | |
1418 | // END_LATEX | |
1419 | // One gets the following linear equation | |
1420 | // BEGIN_LATEX | |
1421 | // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t | |
1422 | // END_LATEX | |
1423 | // where the coefficients have the following meaning | |
1424 | // BEGIN_LATEX | |
1425 | // a = -1/y_{0} | |
1426 | // b = x_{0}/y_{0} | |
1427 | // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0} | |
1428 | // d = z_{0} | |
1429 | // e = dz/dx | |
1430 | // END_LATEX | |
1431 | // The error calculation for the free term is thus | |
1432 | // BEGIN_LATEX | |
1433 | // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t | |
1434 | // END_LATEX | |
1435 | // | |
1436 | // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according | |
1437 | // to the formula: | |
1438 | // BEGIN_LATEX | |
1439 | // C = 1/R = a/(1 + b^{2} + c*a) | |
1440 | // END_LATEX | |
1441 | // | |
1442 | // Authors | |
1443 | // M.Ivanov <M.Ivanov@gsi.de> | |
1444 | // A.Bercuci <A.Bercuci@gsi.de> | |
1445 | // M.Fasel <M.Fasel@gsi.de> | |
1446 | ||
41702fec | 1447 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1448 | fitter->StoreData(kTRUE); | |
1449 | fitter->ClearPoints(); | |
1450 | AliTRDLeastSquare zfitter; | |
4d6aee34 | 1451 | AliTRDcluster *cl = NULL; |
3b57a3f7 | 1452 | |
4d6aee34 | 1453 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
3b57a3f7 | 1454 | if(!tracklets){ |
1455 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1456 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1457 | if(!tracklet->IsOK()) continue; | |
1458 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1459 | } | |
1460 | tracklets = &work[0]; | |
1461 | } | |
1462 | ||
41702fec | 1463 | Double_t xref = CalculateReferenceX(tracklets); |
1464 | Double_t x, y, z, t, tilt, dx, w, we; | |
1465 | Double_t uvt[4]; | |
1466 | Int_t nPoints = 0; | |
1467 | // Containers for Least-square fitter | |
1468 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1469 | if(!tracklets[ipl].IsOK()) continue; | |
8d2bec9e | 1470 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec | 1471 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1472 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1473 | x = cl->GetX(); | |
1474 | y = cl->GetY(); | |
1475 | z = cl->GetZ(); | |
1476 | tilt = tracklets[ipl].GetTilt(); | |
1477 | dx = x - xref; | |
1478 | // Transformation | |
1479 | t = 1./(x*x + y*y); | |
1480 | uvt[0] = 2. * x * t; | |
1481 | uvt[1] = t; | |
1482 | uvt[2] = 2. * tilt * t; | |
1483 | uvt[3] = 2. * tilt * dx * t; | |
1484 | w = 2. * (y + tilt*z) * t; | |
1485 | // error definition changes for the different calls | |
1486 | we = 2. * t; | |
f29f13a6 | 1487 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec | 1488 | fitter->AddPoint(uvt, w, we); |
1489 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1490 | nPoints++; | |
1491 | } | |
1492 | } | |
aec26713 | 1493 | if(fitter->Eval()) return 1.E10; |
1494 | ||
41702fec | 1495 | Double_t z0 = fitter->GetParameter(3); |
1496 | Double_t dzdx = fitter->GetParameter(4); | |
3b57a3f7 | 1497 | |
1498 | ||
1499 | // Linear fitter - not possible to make boundaries | |
1500 | // Do not accept non possible z and dzdx combinations | |
1501 | Bool_t accept = kTRUE; | |
1502 | Double_t zref = 0.0; | |
1503 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1504 | if(!tracklets[iLayer].IsOK()) continue; | |
1505 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1506 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
3b57a3f7 | 1507 | accept = kFALSE; |
1508 | } | |
1509 | if (!accept) { | |
41702fec | 1510 | zfitter.Eval(); |
3b57a3f7 | 1511 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1512 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1513 | fitter->FixParameter(3, zmf); | |
1514 | fitter->FixParameter(4, dzmf); | |
1515 | fitter->Eval(); | |
1516 | fitter->ReleaseParameter(3); | |
1517 | fitter->ReleaseParameter(4); | |
1518 | z0 = fitter->GetParameter(3); // = zmf ? | |
1519 | dzdx = fitter->GetParameter(4); // = dzmf ? | |
1520 | } | |
1521 | ||
1522 | // Calculate Curvature | |
1523 | Double_t a = fitter->GetParameter(0); | |
1524 | Double_t b = fitter->GetParameter(1); | |
1525 | Double_t c = fitter->GetParameter(2); | |
1526 | Double_t y0 = 1. / a; | |
1527 | Double_t x0 = -b * y0; | |
a015e406 | 1528 | Double_t tmp = y0*y0 + x0*x0 - c*y0; |
1529 | if(tmp<=0.) return 1.E10; | |
4d6aee34 | 1530 | Double_t radius = TMath::Sqrt(tmp); |
1531 | Double_t curvature = 1.0 + b*b - c*a; | |
1532 | if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature); | |
3b57a3f7 | 1533 | |
1534 | // Calculate chi2 of the fit | |
1535 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); | |
1536 | ||
1537 | // Update the tracklets | |
1538 | if(!track){ | |
1539 | for(Int_t ip = 0; ip < kNPlanes; ip++) { | |
1540 | x = tracklets[ip].GetX0(); | |
4d6aee34 | 1541 | tmp = radius*radius-(x-x0)*(x-x0); |
a015e406 | 1542 | if(tmp <= 0.) continue; |
1543 | tmp = TMath::Sqrt(tmp); | |
3b57a3f7 | 1544 | |
1545 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
1546 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1547 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); | |
1548 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1549 | tracklets[ip].SetYref(1, (x - x0) / tmp); | |
1550 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); | |
1551 | tracklets[ip].SetZref(1, dzdx); | |
4d6aee34 | 1552 | tracklets[ip].SetC(curvature); |
3b57a3f7 | 1553 | tracklets[ip].SetChi2(chi2); |
1554 | } | |
1555 | } | |
3b57a3f7 | 1556 | //update track points array |
1557 | if(np && points){ | |
1558 | Float_t xyz[3]; | |
1559 | for(int ip=0; ip<np; ip++){ | |
1560 | points[ip].GetXYZ(xyz); | |
4d6aee34 | 1561 | 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 | 1562 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1563 | points[ip].SetXYZ(xyz); | |
1564 | } | |
1565 | } | |
1566 | ||
3b57a3f7 | 1567 | return chi2; |
1568 | } | |
1569 | ||
1570 | ||
1bf51039 | 1571 | //____________________________________________________________________ |
4d6aee34 | 1572 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, const AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points) |
1bf51039 | 1573 | { |
1574 | // Kalman filter implementation for the TRD. | |
1575 | // It returns the positions of the fit in the array "points" | |
1576 | // | |
1577 | // Author : A.Bercuci@gsi.de | |
1578 | ||
3cfaffa4 | 1579 | // printf("Start track @ x[%f]\n", track->GetX()); |
1bf51039 | 1580 | |
1581 | //prepare marker points along the track | |
1582 | Int_t ip = np ? 0 : 1; | |
1583 | while(ip<np){ | |
1584 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; | |
1585 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); | |
1586 | ip++; | |
1587 | } | |
1588 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); | |
1589 | ||
1590 | ||
4d6aee34 | 1591 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
1bf51039 | 1592 | |
1593 | //Loop through the TRD planes | |
1594 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { | |
1595 | // GET TRACKLET OR BUILT IT | |
1596 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; | |
1597 | if(tracklets){ | |
4d6aee34 | 1598 | if(!(ptrTracklet = const_cast<AliTRDseedV1 *>(&tracklets[iplane]))) continue; |
1bf51039 | 1599 | }else{ |
1600 | if(!(ptrTracklet = track->GetTracklet(iplane))){ | |
4d6aee34 | 1601 | /*AliTRDtrackerV1 *tracker = NULL; |
1bf51039 | 1602 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue; |
1603 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); | |
1604 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ | |
1605 | continue; | |
1606 | } | |
1607 | } | |
1608 | if(!ptrTracklet->IsOK()) continue; | |
1609 | ||
1610 | Double_t x = ptrTracklet->GetX0(); | |
1611 | ||
1612 | while(ip < np){ | |
1613 | //don't do anything if next marker is after next update point. | |
1614 | if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break; | |
1bf51039 | 1615 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1616 | ||
1617 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1618 | track->GetXYZ(xyz); |
1619 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1620 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1621 | ip++; |
1622 | } | |
3cfaffa4 | 1623 | // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1bf51039 | 1624 | |
3cfaffa4 | 1625 | // Propagate closer to the next update point |
1bf51039 | 1626 | if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.; |
1627 | ||
1628 | if(!AdjustSector(track)) return -1; | |
1629 | if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1; | |
1630 | ||
1631 | //load tracklet to the tracker and the track | |
1632 | /* Int_t index; | |
1633 | if((index = FindTracklet(ptrTracklet)) < 0){ | |
1634 | ptrTracklet = SetTracklet(&tracklet); | |
1635 | index = fTracklets->GetEntriesFast()-1; | |
1636 | } | |
1637 | track->SetTracklet(ptrTracklet, index);*/ | |
1638 | ||
1639 | ||
1640 | // register tracklet to track with tracklet creation !! | |
1641 | // PropagateBack : loaded tracklet to the tracker and update index | |
1642 | // RefitInward : update index | |
1643 | // MakeTrack : loaded tracklet to the tracker and update index | |
1644 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); | |
1645 | ||
1646 | ||
1647 | //Calculate the mean material budget along the path inside the chamber | |
1648 | Double_t xyz0[3]; track->GetXYZ(xyz0); | |
1649 | Double_t alpha = track->GetAlpha(); | |
1650 | Double_t xyz1[3], y, z; | |
1651 | if(!track->GetProlongation(x, y, z)) return -1; | |
1652 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
1653 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
1654 | xyz1[2] = z; | |
3cfaffa4 | 1655 | if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position |
1bf51039 | 1656 | Double_t param[7]; |
3cfaffa4 | 1657 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break; |
1bf51039 | 1658 | Double_t xrho = param[0]*param[4]; // density*length |
1659 | Double_t xx0 = param[1]; // radiation length | |
1660 | ||
1661 | //Propagate the track | |
1662 | track->PropagateTo(x, xx0, xrho); | |
1663 | if (!AdjustSector(track)) break; | |
1664 | ||
1665 | //Update track | |
b72f4eaf | 1666 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
1667 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; | |
1668 | Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov); | |
1669 | if(chi2<1e+10) track->Update(p, cov, chi2); | |
1bf51039 | 1670 | if(!up) continue; |
1671 | ||
1672 | //Reset material budget if 2 consecutive gold | |
1673 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); | |
1674 | } // end planes loop | |
1675 | ||
1676 | // extrapolation | |
1677 | while(ip < np){ | |
1678 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; | |
1679 | ||
1680 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1681 | track->GetXYZ(xyz); |
1682 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1683 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1684 | ip++; |
1685 | } | |
1686 | ||
1687 | return track->GetChi2(); | |
1688 | } | |
3b57a3f7 | 1689 | |
eb38ed55 | 1690 | //_________________________________________________________________________ |
bb56afff | 1691 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 | 1692 | { |
41702fec | 1693 | // |
1694 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. | |
1695 | // A linear dependence on the x-value serves as a model. | |
1696 | // The parameters are related to the tilted Riemann fit. | |
1697 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
1698 | // - the offset for the reference x | |
1699 | // - the slope | |
1700 | // - the reference x position | |
1701 | // Output: - The Chi2 value of the track in z-Direction | |
1702 | // | |
1703 | Float_t chi2Z = 0, nLayers = 0; | |
053767a4 | 1704 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec | 1705 | if(!tracklets[iLayer].IsOK()) continue; |
1706 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1707 | chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z); |
41702fec | 1708 | nLayers++; |
1709 | } | |
1710 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); | |
1711 | return chi2Z; | |
eb38ed55 | 1712 | } |
1713 | ||
bccda319 | 1714 | //_____________________________________________________________________________ |
1715 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) | |
1716 | { | |
41702fec | 1717 | // |
1718 | // Starting from current X-position of track <t> this function | |
1719 | // extrapolates the track up to radial position <xToGo>. | |
1720 | // Returns 1 if track reaches the plane, and 0 otherwise | |
1721 | // | |
bccda319 | 1722 | |
41702fec | 1723 | const Double_t kEpsilon = 0.00001; |
bccda319 | 1724 | |
41702fec | 1725 | // Current track X-position |
1726 | Double_t xpos = t.GetX(); | |
bccda319 | 1727 | |
41702fec | 1728 | // Direction: inward or outward |
1729 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; | |
bccda319 | 1730 | |
41702fec | 1731 | while (((xToGo - xpos) * dir) > kEpsilon) { |
bccda319 | 1732 | |
41702fec | 1733 | Double_t xyz0[3]; |
1734 | Double_t xyz1[3]; | |
1735 | Double_t param[7]; | |
1736 | Double_t x; | |
1737 | Double_t y; | |
1738 | Double_t z; | |
bccda319 | 1739 | |
41702fec | 1740 | // The next step size |
1741 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); | |
bccda319 | 1742 | |
41702fec | 1743 | // Get the global position of the starting point |
1744 | t.GetXYZ(xyz0); | |
bccda319 | 1745 | |
41702fec | 1746 | // X-position after next step |
1747 | x = xpos + step; | |
bccda319 | 1748 | |
41702fec | 1749 | // Get local Y and Z at the X-position of the next step |
3352b455 | 1750 | if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible |
bccda319 | 1751 | |
41702fec | 1752 | // The global position of the end point of this prolongation step |
1753 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); | |
1754 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); | |
1755 | xyz1[2] = z; | |
bccda319 | 1756 | |
41702fec | 1757 | // Calculate the mean material budget between start and |
1758 | // end point of this prolongation step | |
83dea92e | 1759 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0; |
bccda319 | 1760 | |
41702fec | 1761 | // Propagate the track to the X-position after the next step |
9c87a076 | 1762 | if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0; |
bccda319 | 1763 | |
41702fec | 1764 | // Rotate the track if necessary |
1765 | AdjustSector(&t); | |
bccda319 | 1766 | |
41702fec | 1767 | // New track X-position |
1768 | xpos = t.GetX(); | |
bccda319 | 1769 | |
41702fec | 1770 | } |
bccda319 | 1771 | |
41702fec | 1772 | return 1; |
bccda319 | 1773 | |
1774 | } | |
1775 | ||
eb38ed55 | 1776 | |
1777 | //_____________________________________________________________________________ | |
1778 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const | |
1779 | { | |
41702fec | 1780 | // |
1781 | // Reads AliTRDclusters from the file. | |
1782 | // The names of the cluster tree and branches | |
1783 | // should match the ones used in AliTRDclusterizer::WriteClusters() | |
1784 | // | |
1785 | ||
1786 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); | |
1787 | TObjArray *clusterArray = new TObjArray(nsize+1000); | |
1788 | ||
1789 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); | |
1790 | if (!branch) { | |
1791 | AliError("Can't get the branch !"); | |
1792 | return 1; | |
1793 | } | |
1794 | branch->SetAddress(&clusterArray); | |
1795 | ||
1796 | if(!fClusters){ | |
4d6aee34 | 1797 | Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters(); |
1798 | if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector; | |
8ae98148 | 1799 | array = new TClonesArray("AliTRDcluster", Int_t(nclusters)); |
41702fec | 1800 | array->SetOwner(kTRUE); |
1801 | } | |
1802 | ||
1803 | // Loop through all entries in the tree | |
1804 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); | |
1805 | Int_t nbytes = 0; | |
1806 | Int_t ncl = 0; | |
4d6aee34 | 1807 | AliTRDcluster *c = NULL; |
41702fec | 1808 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { |
1809 | // Import the tree | |
1810 | nbytes += clusterTree->GetEvent(iEntry); | |
1811 | ||
1812 | // Get the number of points in the detector | |
1813 | Int_t nCluster = clusterArray->GetEntriesFast(); | |
1814 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { | |
1815 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; | |
41702fec | 1816 | new((*fClusters)[ncl++]) AliTRDcluster(*c); |
1817 | delete (clusterArray->RemoveAt(iCluster)); | |
1818 | } | |
1819 | ||
1820 | } | |
1821 | delete clusterArray; | |
1822 | ||
1823 | return 0; | |
eb38ed55 | 1824 | } |
1825 | ||
1826 | //_____________________________________________________________________________ | |
1827 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) | |
1828 | { | |
41702fec | 1829 | // |
66f6bfd9 | 1830 | // Fills clusters into TRD tracking sectors |
41702fec | 1831 | // |
41702fec | 1832 | |
4d6aee34 | 1833 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 | 1834 | fClusters = AliTRDReconstructor::GetClusters(); |
1835 | } else { | |
66f6bfd9 | 1836 | if (ReadClusters(fClusters, cTree)) { |
1837 | AliError("Problem with reading the clusters !"); | |
1838 | return 1; | |
1839 | } | |
1840 | } | |
1841 | SetClustersOwner(); | |
1842 | ||
48f8adf3 | 1843 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 | 1844 | AliInfo("No TRD clusters"); |
41702fec | 1845 | return 1; |
1846 | } | |
66f6bfd9 | 1847 | |
1848 | //Int_t nin = | |
1849 | BuildTrackingContainers(); | |
1850 | ||
1851 | //Int_t ncl = fClusters->GetEntriesFast(); | |
1852 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
1853 | ||
1854 | return 0; | |
1855 | } | |
1856 | ||
1857 | //_____________________________________________________________________________ | |
4d6aee34 | 1858 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters) |
66f6bfd9 | 1859 | { |
1860 | // | |
1861 | // Fills clusters into TRD tracking sectors | |
1862 | // Function for use in the HLT | |
1863 | ||
1864 | if(!clusters || !clusters->GetEntriesFast()){ | |
1865 | AliInfo("No TRD clusters"); | |
41702fec | 1866 | return 1; |
1867 | } | |
1868 | ||
66f6bfd9 | 1869 | fClusters = clusters; |
1870 | SetClustersOwner(); | |
1871 | ||
1872 | //Int_t nin = | |
1873 | BuildTrackingContainers(); | |
1874 | ||
1875 | //Int_t ncl = fClusters->GetEntriesFast(); | |
1876 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
1877 | ||
1878 | return 0; | |
1879 | } | |
1880 | ||
1881 | ||
1882 | //____________________________________________________________________ | |
1883 | Int_t AliTRDtrackerV1::BuildTrackingContainers() | |
1884 | { | |
1885 | // Building tracking containers for clusters | |
1886 | ||
1887 | Int_t nin =0, icl = fClusters->GetEntriesFast(); | |
41702fec | 1888 | while (icl--) { |
1889 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); | |
1890 | if(c->IsInChamber()) nin++; | |
1891 | Int_t detector = c->GetDetector(); | |
1892 | Int_t sector = fGeom->GetSector(detector); | |
053767a4 | 1893 | Int_t stack = fGeom->GetStack(detector); |
1894 | Int_t layer = fGeom->GetLayer(detector); | |
41702fec | 1895 | |
053767a4 | 1896 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl); |
41702fec | 1897 | } |
b0a48c4d | 1898 | |
1899 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); | |
053767a4 | 1900 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec | 1901 | if(!fTrSec[isector].GetNChambers()) continue; |
4d6aee34 | 1902 | fTrSec[isector].Init(fkReconstructor, cal); |
41702fec | 1903 | } |
66f6bfd9 | 1904 | |
1905 | return nin; | |
eb38ed55 | 1906 | } |
1907 | ||
1908 | ||
66f6bfd9 | 1909 | |
0906e73e | 1910 | //____________________________________________________________________ |
172b6f82 | 1911 | void AliTRDtrackerV1::UnloadClusters() |
0906e73e | 1912 | { |
d4cf71ca | 1913 | // |
1914 | // Clears the arrays of clusters and tracks. Resets sectors and timebins | |
1915 | // If option "force" is also set the containers are also deleted. This is useful | |
1916 | // in case of HLT | |
1917 | ||
1918 | if(fTracks){ | |
1919 | fTracks->Delete(); | |
4d6aee34 | 1920 | if(HasRemoveContainers()){delete fTracks; fTracks = NULL;} |
d4cf71ca | 1921 | } |
1922 | if(fTracklets){ | |
1923 | fTracklets->Delete(); | |
4d6aee34 | 1924 | if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;} |
d4cf71ca | 1925 | } |
48f8adf3 | 1926 | if(fClusters){ |
1927 | if(IsClustersOwner()) fClusters->Delete(); | |
1928 | ||
1929 | // save clusters array in the reconstructor for further use. | |
4d6aee34 | 1930 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 | 1931 | AliTRDReconstructor::SetClusters(fClusters); |
1932 | SetClustersOwner(kFALSE); | |
4d6aee34 | 1933 | } else AliTRDReconstructor::SetClusters(NULL); |
48f8adf3 | 1934 | } |
0906e73e | 1935 | |
053767a4 | 1936 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e | 1937 | |
41702fec | 1938 | // Increment the Event Number |
1939 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); | |
eb38ed55 | 1940 | } |
0906e73e | 1941 | |
fac58f00 | 1942 | // //____________________________________________________________________ |
1943 | // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const | |
1944 | // { | |
1945 | // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t); | |
1946 | // if(!track) return; | |
1947 | // | |
4d6aee34 | 1948 | // AliTRDseedV1 *tracklet = NULL; |
fac58f00 | 1949 | // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){ |
1950 | // if(!(tracklet = track->GetTracklet(ily))) continue; | |
4d6aee34 | 1951 | // AliTRDcluster *c = NULL; |
8d2bec9e | 1952 | // for(Int_t ic=AliTRDseed::kNclusters; ic--;){ |
fac58f00 | 1953 | // if(!(c=tracklet->GetClusters(ic))) continue; |
1954 | // c->Use(); | |
1955 | // } | |
1956 | // } | |
1957 | // } | |
1958 | // | |
b1957d3c | 1959 | |
eb38ed55 | 1960 | //_____________________________________________________________________________ |
4d6aee34 | 1961 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track) |
eb38ed55 | 1962 | { |
41702fec | 1963 | // |
1964 | // Rotates the track when necessary | |
1965 | // | |
1966 | ||
1967 | Double_t alpha = AliTRDgeometry::GetAlpha(); | |
1968 | Double_t y = track->GetY(); | |
1969 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); | |
3cfaffa4 | 1970 | |
41702fec | 1971 | if (y > ymax) { |
1972 | if (!track->Rotate( alpha)) { | |
1973 | return kFALSE; | |
1974 | } | |
1975 | } | |
1976 | else if (y < -ymax) { | |
1977 | if (!track->Rotate(-alpha)) { | |
1978 | return kFALSE; | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | return kTRUE; | |
0906e73e | 1983 | |
1984 | } | |
1985 | ||
eb38ed55 | 1986 | |
0906e73e | 1987 | //____________________________________________________________________ |
4d6aee34 | 1988 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx) |
0906e73e | 1989 | { |
41702fec | 1990 | // Find tracklet for TRD track <track> |
1991 | // Parameters | |
1992 | // - track | |
1993 | // - sector | |
1994 | // - plane | |
1995 | // - index | |
1996 | // Output | |
1997 | // tracklet | |
1998 | // index | |
1999 | // Detailed description | |
2000 | // | |
2001 | idx = track->GetTrackletIndex(p); | |
4d6aee34 | 2002 | AliTRDseedV1 *tracklet = (idx==0xffff) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
41702fec | 2003 | |
2004 | return tracklet; | |
0906e73e | 2005 | } |
2006 | ||
2007 | //____________________________________________________________________ | |
4d6aee34 | 2008 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet) |
0906e73e | 2009 | { |
41702fec | 2010 | // Add this tracklet to the list of tracklets stored in the tracker |
2011 | // | |
2012 | // Parameters | |
2013 | // - tracklet : pointer to the tracklet to be added to the list | |
2014 | // | |
2015 | // Output | |
2016 | // - the index of the new tracklet in the tracker tracklets list | |
2017 | // | |
2018 | // Detailed description | |
2019 | // Build the tracklets list if it is not yet created (late initialization) | |
2020 | // and adds the new tracklet to the list. | |
2021 | // | |
2022 | if(!fTracklets){ | |
053767a4 | 2023 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec | 2024 | fTracklets->SetOwner(kTRUE); |
2025 | } | |
2026 | Int_t nentries = fTracklets->GetEntriesFast(); | |
2027 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); | |
972ef65e | 2028 | } |
2029 | ||
d20df6fc | 2030 | //____________________________________________________________________ |
4d6aee34 | 2031 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track) |
d20df6fc | 2032 | { |
2033 | // Add this track to the list of tracks stored in the tracker | |
2034 | // | |
2035 | // Parameters | |
2036 | // - track : pointer to the track to be added to the list | |
2037 | // | |
2038 | // Output | |
2039 | // - the pointer added | |
2040 | // | |
2041 | // Detailed description | |
2042 | // Build the tracks list if it is not yet created (late initialization) | |
2043 | // and adds the new track to the list. | |
2044 | // | |
2045 | if(!fTracks){ | |
053767a4 | 2046 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc | 2047 | fTracks->SetOwner(kTRUE); |
2048 | } | |
2049 | Int_t nentries = fTracks->GetEntriesFast(); | |
2050 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); | |
2051 | } | |
2052 | ||
2053 | ||
0906e73e | 2054 | |
e4f2f73d | 2055 | //____________________________________________________________________ |
eb38ed55 | 2056 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d | 2057 | { |
41702fec | 2058 | // |
2059 | // Steer tracking for one SM. | |
2060 | // | |
2061 | // Parameters : | |
2062 | // sector : Array of (SM) propagation layers containing clusters | |
2063 | // esd : The current ESD event. On output it contains the also | |
2064 | // the ESD (TRD) tracks found in this SM. | |
2065 | // | |
2066 | // Output : | |
2067 | // Number of tracks found in this TRD supermodule. | |
2068 | // | |
2069 | // Detailed description | |
2070 | // | |
2071 | // 1. Unpack AliTRDpropagationLayers objects for each stack. | |
2072 | // 2. Launch stack tracking. | |
2073 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. | |
2074 | // 3. Pack results in the ESD event. | |
2075 | // | |
2076 | ||
2077 | // allocate space for esd tracks in this SM | |
2078 | TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack); | |
2079 | esdTrackList.SetOwner(); | |
2080 | ||
2081 | Int_t nTracks = 0; | |
2082 | Int_t nChambers = 0; | |
4d6aee34 | 2083 | AliTRDtrackingChamber **stack = NULL, *chamber = NULL; |
053767a4 | 2084 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec | 2085 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
2086 | nChambers = 0; | |
053767a4 | 2087 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
2088 | if(!(chamber = stack[ilayer])) continue; | |
4d6aee34 | 2089 | if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec | 2090 | nChambers++; |
053767a4 | 2091 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec | 2092 | } |
2093 | if(nChambers < 4) continue; | |
2094 | //AliInfo(Form("Doing stack %d", istack)); | |
2095 | nTracks += Clusters2TracksStack(stack, &esdTrackList); | |
2096 | } | |
2097 | //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks())); | |
2098 | ||
2099 | for(int itrack=0; itrack<nTracks; itrack++) | |
2100 | esd->AddTrack((AliESDtrack*)esdTrackList[itrack]); | |
2101 | ||
2102 | // Reset Track and Candidate Number | |
2103 | AliTRDtrackerDebug::SetCandidateNumber(0); | |
2104 | AliTRDtrackerDebug::SetTrackNumber(0); | |
2105 | return nTracks; | |
e4f2f73d | 2106 | } |
2107 | ||
2108 | //____________________________________________________________________ | |
4d6aee34 | 2109 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList) |
e4f2f73d | 2110 | { |
41702fec | 2111 | // |
2112 | // Make tracks in one TRD stack. | |
2113 | // | |
2114 | // Parameters : | |
2115 | // layer : Array of stack propagation layers containing clusters | |
2116 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. | |
2117 | // On exit the tracks found in this stack are appended. | |
2118 | // | |
2119 | // Output : | |
2120 | // Number of tracks found in this stack. | |
2121 | // | |
2122 | // Detailed description | |
2123 | // | |
2124 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. | |
2125 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. | |
2126 | // See AliTRDtrackerV1::MakeSeeds() for more details. | |
2127 | // 3. Arrange track candidates in decreasing order of their quality | |
2128 | // 4. Classify tracks in 5 categories according to: | |
2129 | // a) number of layers crossed | |
2130 | // b) track quality | |
2131 | // 5. Sign clusters by tracks in decreasing order of track quality | |
2132 | // 6. Build AliTRDtrack out of seeding tracklets | |
2133 | // 7. Cook MC label | |
2134 | // 8. Build ESD track and register it to the output list | |
2135 | // | |
2136 | ||
b0a48c4d | 2137 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
4d6aee34 | 2138 | AliTRDtrackingChamber *chamber = NULL; |
2139 | AliTRDtrackingChamber **ci = NULL; | |
41702fec | 2140 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
2141 | Int_t pars[4]; // MakeSeeds parameters | |
2142 | ||
2143 | //Double_t alpha = AliTRDgeometry::GetAlpha(); | |
2144 | //Double_t shift = .5 * alpha; | |
2145 | Int_t configs[kNConfigs]; | |
2146 | ||
fac58f00 | 2147 | // Purge used clusters from the containers |
2148 | ci = &stack[0]; | |
2149 | for(Int_t ic = kNPlanes; ic--; ci++){ | |
2150 | if(!(*ci)) continue; | |
2151 | (*ci)->Update(); | |
2152 | } | |
2153 | ||
41702fec | 2154 | // Build initial seeding configurations |
2155 | Double_t quality = BuildSeedingConfigs(stack, configs); | |
4d6aee34 | 2156 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){ |
41702fec | 2157 | AliInfo(Form("Plane config %d %d %d Quality %f" |
2158 | , configs[0], configs[1], configs[2], quality)); | |
2159 | } | |
d931f2aa | 2160 | |
41702fec | 2161 | |
2162 | // Initialize contors | |
2163 | Int_t ntracks, // number of TRD track candidates | |
2164 | ntracks1, // number of registered TRD tracks/iter | |
2165 | ntracks2 = 0; // number of all registered TRD tracks in stack | |
2166 | fSieveSeeding = 0; | |
d931f2aa | 2167 | |
2168 | // Get stack index | |
fac58f00 | 2169 | Int_t ic = 0; ci = &stack[0]; |
2170 | while(ic<kNPlanes && !(*ci)){ic++; ci++;} | |
2171 | if(!(*ci)) return ntracks2; | |
2172 | Int_t istack = fGeom->GetStack((*ci)->GetDetector()); | |
d931f2aa | 2173 | |
41702fec | 2174 | do{ |
2175 | // Loop over seeding configurations | |
2176 | ntracks = 0; ntracks1 = 0; | |
2177 | for (Int_t iconf = 0; iconf<3; iconf++) { | |
2178 | pars[0] = configs[iconf]; | |
2179 | pars[1] = ntracks; | |
d931f2aa | 2180 | pars[2] = istack; |
41702fec | 2181 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
6e39bde4 | 2182 | //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks)); |
41702fec | 2183 | if(ntracks == kMaxTracksStack) break; |
2184 | } | |
4d6aee34 | 2185 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec | 2186 | |
2187 | if(!ntracks) break; | |
2188 | ||
2189 | // Sort the seeds according to their quality | |
2190 | Int_t sort[kMaxTracksStack]; | |
2191 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); | |
2192 | ||
2193 | // Initialize number of tracks so far and logic switches | |
2194 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); | |
2195 | Bool_t signedTrack[kMaxTracksStack]; | |
2196 | Bool_t fakeTrack[kMaxTracksStack]; | |
2197 | for (Int_t i=0; i<ntracks; i++){ | |
2198 | signedTrack[i] = kFALSE; | |
2199 | fakeTrack[i] = kFALSE; | |
2200 | } | |
2201 | //AliInfo("Selecting track candidates ..."); | |
2202 | ||
2203 | // Sieve clusters in decreasing order of track quality | |
2204 | Double_t trackParams[7]; | |
4d6aee34 | 2205 | // AliTRDseedV1 *lseed = NULL; |
41702fec | 2206 | Int_t jSieve = 0, candidates; |
2207 | do{ | |
2208 | //AliInfo(Form("\t\tITER = %i ", jSieve)); | |
2209 | ||
2210 | // Check track candidates | |
2211 | candidates = 0; | |
2212 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { | |
804bb02e | 2213 | Int_t trackIndex = sort[itrack]; |
2214 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; | |
41702fec | 2215 | |
2216 | ||
804bb02e | 2217 | // Calculate track parameters from tracklets seeds |
804bb02e | 2218 | Int_t ncl = 0; |
2219 | Int_t nused = 0; | |
2220 | Int_t nlayers = 0; | |
2221 | Int_t findable = 0; | |
2222 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { | |
2223 | Int_t jseed = kNPlanes*trackIndex+jLayer; | |
2224 | if(!sseed[jseed].IsOK()) continue; | |
f29f13a6 | 2225 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++; |
eede7907 | 2226 | // TODO here we get a sig fault which should never happen ! |
804bb02e | 2227 | sseed[jseed].UpdateUsed(); |
2228 | ncl += sseed[jseed].GetN2(); | |
2229 | nused += sseed[jseed].GetNUsed(); | |
2230 | nlayers++; | |
804bb02e | 2231 | } |
2232 | ||
f29f13a6 | 2233 | // Filter duplicated tracks |
2234 | if (nused > 30){ | |
2235 | //printf("Skip %d nused %d\n", trackIndex, nused); | |
2236 | fakeTrack[trackIndex] = kTRUE; | |
2237 | continue; | |
2238 | } | |
2239 | if (Float_t(nused)/ncl >= .25){ | |
2240 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); | |
2241 | fakeTrack[trackIndex] = kTRUE; | |
2242 | continue; | |
2243 | } | |
41702fec | 2244 | |
f29f13a6 | 2245 | // Classify tracks |
2246 | Bool_t skip = kFALSE; | |
2247 | switch(jSieve){ | |
2248 | case 0: | |
2249 | if(nlayers < 6) {skip = kTRUE; break;} | |
2250 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
2251 | break; | |
2252 | ||
2253 | case 1: | |
2254 | if(nlayers < findable){skip = kTRUE; break;} | |
2255 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} | |
2256 | break; | |
2257 | ||
2258 | case 2: | |
2259 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} | |
2260 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} | |
2261 | break; | |
2262 | ||
2263 | case 3: | |
2264 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} | |
2265 | break; | |
2266 | ||
2267 | case 4: | |
2268 | if (nlayers == 3){skip = kTRUE; break;} | |
2269 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} | |
2270 | break; | |
2271 | } | |
2272 | if(skip){ | |
2273 | candidates++; | |
2274 | //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused); | |
2275 | continue; | |
2276 | } | |
2277 | signedTrack[trackIndex] = kTRUE; | |
2278 | ||
2279 | // Build track parameters | |
2280 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; | |
2281 | /* Int_t idx = 0; | |
2282 | while(idx<3 && !lseed->IsOK()) { | |
2283 | idx++; | |
2284 | lseed++; | |
2285 | }*/ | |
2286 | Double_t x = lseed->GetX0();// - 3.5; | |
2287 | trackParams[0] = x; //NEW AB | |
2288 | trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x); | |
2289 | trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x); | |
2290 | trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1))); | |
2291 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); | |
2292 | trackParams[5] = lseed->GetC(); | |
2293 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; | |
2294 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ | |
2295 | ||
4d6aee34 | 2296 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
eb2b4f91 | 2297 | //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); |
f29f13a6 | 2298 | |
f29f13a6 | 2299 | AliTRDseedV1 *dseed[6]; |
b82b4de1 | 2300 | for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]); |
f29f13a6 | 2301 | |
2302 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); | |
f29f13a6 | 2303 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2304 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); | |
2305 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 2306 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
f29f13a6 | 2307 | cstreamer << "Clusters2TracksStack" |
2308 | << "EventNumber=" << eventNumber | |
2309 | << "TrackNumber=" << trackNumber | |
2310 | << "CandidateNumber=" << candidateNumber | |
2311 | << "Iter=" << fSieveSeeding | |
2312 | << "Like=" << fTrackQuality[trackIndex] | |
2313 | << "S0.=" << dseed[0] | |
2314 | << "S1.=" << dseed[1] | |
2315 | << "S2.=" << dseed[2] | |
2316 | << "S3.=" << dseed[3] | |
2317 | << "S4.=" << dseed[4] | |
2318 | << "S5.=" << dseed[5] | |
2319 | << "p0=" << trackParams[0] | |
2320 | << "p1=" << trackParams[1] | |
2321 | << "p2=" << trackParams[2] | |
2322 | << "p3=" << trackParams[3] | |
2323 | << "p4=" << trackParams[4] | |
2324 | << "p5=" << trackParams[5] | |
2325 | << "p6=" << trackParams[6] | |
f29f13a6 | 2326 | << "Ncl=" << ncl |
2327 | << "NLayers=" << nlayers | |
2328 | << "Findable=" << findable | |
2329 | << "NUsed=" << nused | |
2330 | << "\n"; | |
2331 | } | |
d877f55f | 2332 | |
f29f13a6 | 2333 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
2334 | if(!track){ | |
2335 | AliWarning("Fail to build a TRD Track."); | |
2336 | continue; | |
d877f55f | 2337 | } |
41702fec | 2338 | |
f29f13a6 | 2339 | //AliInfo("End of MakeTrack()"); |
2340 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); | |
2341 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); | |
2342 | esdTrack->SetLabel(track->GetLabel()); | |
2343 | track->UpdateESDtrack(esdTrack); | |
2344 | // write ESD-friends if neccessary | |
4d6aee34 | 2345 | if (fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
f29f13a6 | 2346 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); |
2347 | calibTrack->SetOwner(); | |
2348 | esdTrack->AddCalibObject(calibTrack); | |
2349 | } | |
2350 | ntracks1++; | |
2351 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); | |
41702fec | 2352 | } |
2353 | ||
2354 | jSieve++; | |
2355 | } while(jSieve<5 && candidates); // end track candidates sieve | |
2356 | if(!ntracks1) break; | |
2357 | ||
2358 | // increment counters | |
2359 | ntracks2 += ntracks1; | |
4302c900 | 2360 | |
4d6aee34 | 2361 | if(fkReconstructor->IsHLT()) break; |
41702fec | 2362 | fSieveSeeding++; |
2363 | ||
2364 | // Rebuild plane configurations and indices taking only unused clusters into account | |
2365 | quality = BuildSeedingConfigs(stack, configs); | |
4d6aee34 | 2366 | if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec | 2367 | |
2368 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
2369 | if(!(chamber = stack[ip])) continue; | |
b0a48c4d | 2370 | chamber->Build(fGeom, cal);//Indices(fSieveSeeding); |
41702fec | 2371 | } |
2372 | ||
4d6aee34 | 2373 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){ |
41702fec | 2374 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2375 | } | |
2376 | } while(fSieveSeeding<10); // end stack clusters sieve | |
2377 | ||
2378 | ||
2379 | ||
2380 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); | |
2381 | ||
2382 | return ntracks2; | |
e4f2f73d | 2383 | } |
2384 | ||
2385 | //___________________________________________________________________ | |
eb38ed55 | 2386 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d | 2387 | { |
41702fec | 2388 | // |
2389 | // Assign probabilities to chambers according to their | |
2390 | // capability of producing seeds. | |
2391 | // | |
2392 | // Parameters : | |
2393 | // | |
2394 | // layers : Array of stack propagation layers for all 6 chambers in one stack | |
2395 | // configs : On exit array of configuration indexes (see GetSeedingConfig() | |
2396 | // for details) in the decreasing order of their seeding probabilities. | |
2397 | // | |
2398 | // Output : | |
2399 | // | |
2400 | // Return top configuration quality | |
2401 | // | |
2402 | // Detailed description: | |
2403 | // | |
2404 | // To each chamber seeding configuration (see GetSeedingConfig() for | |
2405 | // the list of all configurations) one defines 2 quality factors: | |
2406 | // - an apriori topological quality (see GetSeedingConfig() for details) and | |
2407 | // - a data quality based on the uniformity of the distribution of | |
2408 | // clusters over the x range (time bins population). See CookChamberQA() for details. | |
2409 | // The overall chamber quality is given by the product of this 2 contributions. | |
2410 | // | |
2411 | ||
eb2b4f91 | 2412 | Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t)); |
4d6aee34 | 2413 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 2414 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2415 | if(!(chamber = stack[iplane])) continue; | |
2416 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; | |
2417 | } | |
2418 | ||
eb2b4f91 | 2419 | Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t)); |
2420 | Int_t planes[] = {0, 0, 0, 0}; | |
41702fec | 2421 | for(int iconf=0; iconf<kNConfigs; iconf++){ |
2422 | GetSeedingConfig(iconf, planes); | |
2423 | tconfig[iconf] = fgTopologicQA[iconf]; | |
2424 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; | |
2425 | } | |
2426 | ||
2427 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); | |
2428 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); | |
2429 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); | |
2430 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); | |
2431 | ||
2432 | return tconfig[configs[0]]; | |
e4f2f73d | 2433 | } |
2434 | ||
2435 | //____________________________________________________________________ | |
4d6aee34 | 2436 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, const AliTRDseedV1 * const sseed, const Int_t * const ipar) |
e4f2f73d | 2437 | { |
afa21247 | 2438 | // |
2a3191bb | 2439 | // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are |
2440 | // either missed by TPC prolongation or conversions inside the TRD volume. | |
2441 | // For stand alone tracking the procedure is used to estimate all tracks measured by TRD. | |
afa21247 | 2442 | // |
2443 | // Parameters : | |
2444 | // layers : Array of stack propagation layers containing clusters | |
2445 | // sseed : Array of empty tracklet seeds. On exit they are filled. | |
2446 | // ipar : Control parameters: | |
2447 | // ipar[0] -> seeding chambers configuration | |
2448 | // ipar[1] -> stack index | |
2449 | // ipar[2] -> number of track candidates found so far | |
2450 | // | |
2451 | // Output : | |
2452 | // Number of tracks candidates found. | |
2453 | // | |
2454 | // The following steps are performed: | |
2455 | // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the | |
2456 | // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding | |
2457 | // is described in AliTRDtrackerV1::Clusters2TracksStack(). | |
2458 | // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm: | |
2459 | // - for each seeding cluster in the lower seeding layer find | |
2460 | // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle | |
2461 | // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker. | |
2462 | // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the | |
2463 | // reco params | |
2464 | // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three | |
2465 | // seeding clusters. | |
2466 | // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond() | |
2467 | // and AliTRDchamberTimeBin::GetClusters(). | |
2468 | // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is | |
2469 | // performed at this level | |
2470 | // 4. Initialize seeding tracklets in the seeding chambers. | |
2471 | // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params. | |
2472 | // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see | |
2473 | // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25). | |
2474 | // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed. | |
2475 | // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new | |
2476 | // approximation of the track. | |
2477 | // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are | |
2478 | // checked against the Riemann fit: | |
2479 | // - position resolution in y | |
2480 | // - angular resolution in the bending plane | |
2481 | // - likelihood of the number of clusters attached to the tracklet | |
2482 | // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers: | |
2483 | // - Initialization of extrapolation tracklets with the fit parameters | |
2484 | // - Attach clusters to extrapolated tracklets | |
2485 | // - Helix fit of tracklets | |
2486 | // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track | |
2487 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. | |
2488 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation | |
2489 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. | |
2490 | // 14. Cooking labels for tracklets. Should be done only for MC | |
2491 | // 15. Register seeds. | |
2492 | // | |
2493 | // Authors: | |
2494 | // Marian Ivanov <M.Ivanov@gsi.de> | |
2495 | // Alexandru Bercuci <A.Bercuci@gsi.de> | |
2496 | // Markus Fasel <M.Fasel@gsi.de> | |
41702fec | 2497 | |
4d6aee34 | 2498 | AliTRDtrackingChamber *chamber = NULL; |
2499 | AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters | |
2500 | AliTRDseedV1 *cseed = const_cast<AliTRDseedV1 *>(&sseed[0]); // initialize tracklets for first track | |
41702fec | 2501 | Int_t ncl, mcl; // working variable for looping over clusters |
2502 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; | |
2503 | // chi2 storage | |
2504 | // chi2[0] = tracklet chi2 on the Z direction | |
2505 | // chi2[1] = tracklet chi2 on the R direction | |
2506 | Double_t chi2[4]; | |
2507 | ||
afa21247 | 2508 | // this should be data member of AliTRDtrack TODO |
41702fec | 2509 | Double_t seedQuality[kMaxTracksStack]; |
2510 | ||
2511 | // unpack control parameters | |
2512 | Int_t config = ipar[0]; | |
2513 | Int_t ntracks = ipar[1]; | |
d931f2aa | 2514 | Int_t istack = ipar[2]; |
41702fec | 2515 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
afa21247 | 2516 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
be24510a | 2517 | |
2518 | ||
41702fec | 2519 | // Init chambers geometry |
41702fec | 2520 | Double_t hL[kNPlanes]; // Tilting angle |
2521 | Float_t padlength[kNPlanes]; // pad lenghts | |
dd8059a8 | 2522 | Float_t padwidth[kNPlanes]; // pad widths |
4d6aee34 | 2523 | AliTRDpadPlane *pp = NULL; |
41702fec | 2524 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2525 | pp = fGeom->GetPadPlane(iplane, istack); | |
bb79ccd5 | 2526 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec | 2527 | padlength[iplane] = pp->GetLengthIPad(); |
dd8059a8 | 2528 | padwidth[iplane] = pp->GetWidthIPad(); |
41702fec | 2529 | } |
2530 | ||
eb2b4f91 | 2531 | // Init anode wire position for chambers |
e165b64b | 2532 | Double_t x0[kNPlanes], // anode wire position |
eb2b4f91 | 2533 | driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length |
4d6aee34 | 2534 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 2535 | Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.}; |
2536 | Double_t glb[] = {0., 0., 0.}; | |
2537 | AliTRDtrackingChamber **cIter = &stack[0]; | |
a3743898 | 2538 | for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){ |
eb2b4f91 | 2539 | if(!(*cIter)) continue; |
e165b64b | 2540 | if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){ |
2541 | continue; | |
2542 | x0[iLayer] = fgkX0[iLayer]; | |
2543 | } | |
eb2b4f91 | 2544 | matrix->LocalToMaster(loc, glb); |
2545 | x0[iLayer] = glb[0]; | |
2546 | } | |
2547 | ||
4d6aee34 | 2548 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){ |
41702fec | 2549 | AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
2550 | } | |
2551 | ||
d931f2aa | 2552 | // Build seeding layers |
d611c74f | 2553 | ResetSeedTB(); |
41702fec | 2554 | Int_t nlayers = 0; |
41702fec | 2555 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2556 | if(!(chamber = stack[planes[isl]])) continue; | |
4d6aee34 | 2557 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue; |
41702fec | 2558 | nlayers++; |
41702fec | 2559 | } |
eb2b4f91 | 2560 | if(nlayers < kNSeedPlanes) return ntracks; |
41702fec | 2561 | |
2562 | ||
2563 | // Start finding seeds | |
2564 | Double_t cond0[4], cond1[4], cond2[4]; | |
2565 | Int_t icl = 0; | |
d611c74f | 2566 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec | 2567 | if(!c[3]) continue; |
d611c74f | 2568 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2569 | fSeedTB[0]->GetClusters(cond0, index, ncl); | |
41702fec | 2570 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2571 | Int_t jcl = 0; | |
2572 | while(jcl<ncl) { | |
d611c74f | 2573 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec | 2574 | if(!c[0]) continue; |
2575 | Double_t dx = c[3]->GetX() - c[0]->GetX(); | |
afa21247 | 2576 | Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx; |
2577 | Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx; | |
2578 | fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx); | |
d611c74f | 2579 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); |
41702fec | 2580 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2581 | ||
2582 | Int_t kcl = 0; | |
2583 | while(kcl<mcl) { | |
d611c74f | 2584 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2585 | if(!c[1]) continue; | |
afa21247 | 2586 | fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx); |
d611c74f | 2587 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); |
2588 | //printf("Found c[1] candidate 2 %p\n", c[2]); | |
2589 | if(!c[2]) continue; | |
2590 | ||
6e39bde4 | 2591 | //AliInfo("Seeding clusters found. Building seeds ..."); |
2592 | //for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ()); | |
d611c74f | 2593 | |
804bb02e | 2594 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec | 2595 | |
d611c74f | 2596 | FitRieman(c, chi2); |
2597 | ||
d931f2aa | 2598 | AliTRDseedV1 *tseed = &cseed[0]; |
bb2db46c | 2599 | cIter = &stack[0]; |
2600 | for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){ | |
2601 | Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1; | |
eb2b4f91 | 2602 | tseed->SetDetector(det); |
43d6ad34 | 2603 | tseed->SetTilt(hL[iLayer]); |
2604 | tseed->SetPadLength(padlength[iLayer]); | |
dd8059a8 | 2605 | tseed->SetPadWidth(padwidth[iLayer]); |
4d6aee34 | 2606 | tseed->SetReconstructor(fkReconstructor); |
eb2b4f91 | 2607 | tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]); |
d611c74f | 2608 | tseed->Init(GetRiemanFitter()); |
f29f13a6 | 2609 | tseed->SetStandAlone(kTRUE); |
d611c74f | 2610 | } |
2611 | ||
2612 | Bool_t isFake = kFALSE; | |
4d6aee34 | 2613 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
d611c74f | 2614 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2615 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2616 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2617 | ||
2618 | Double_t xpos[4]; | |
2619 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); | |
2620 | Float_t yref[4]; | |
2621 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); | |
2622 | Int_t ll = c[3]->GetLabel(0); | |
2623 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2624 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2625 | AliRieman *rim = GetRiemanFitter(); | |
4d6aee34 | 2626 | TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f | 2627 | cs0 << "MakeSeeds0" |
2628 | <<"EventNumber=" << eventNumber | |
2629 | <<"CandidateNumber=" << candidateNumber | |
2630 | <<"isFake=" << isFake | |
2631 | <<"config=" << config | |
2632 | <<"label=" << ll | |
2633 | <<"chi2z=" << chi2[0] | |
2634 | <<"chi2y=" << chi2[1] | |
2635 | <<"Y2exp=" << cond2[0] | |
2636 | <<"Z2exp=" << cond2[1] | |
2637 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() | |
2638 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() | |
2639 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() | |
2640 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() | |
2641 | <<"yref0=" << yref[0] | |
2642 | <<"yref1=" << yref[1] | |
2643 | <<"yref2=" << yref[2] | |
2644 | <<"yref3=" << yref[3] | |
2645 | <<"c0.=" << c[0] | |
2646 | <<"c1.=" << c[1] | |
2647 | <<"c2.=" << c[2] | |
2648 | <<"c3.=" << c[3] | |
2649 | <<"Seed0.=" << &cseed[planes[0]] | |
2650 | <<"Seed1.=" << &cseed[planes[1]] | |
2651 | <<"Seed2.=" << &cseed[planes[2]] | |
2652 | <<"Seed3.=" << &cseed[planes[3]] | |
2653 | <<"RiemanFitter.=" << rim | |
2654 | <<"\n"; | |
2655 | } | |
4d6aee34 | 2656 | if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
6e39bde4 | 2657 | //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0])); |
d611c74f | 2658 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2659 | continue; | |
2660 | } | |
4d6aee34 | 2661 | if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
6e39bde4 | 2662 | //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1])); |
d611c74f | 2663 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2664 | continue; | |
2665 | } | |
2666 | //AliInfo("Passed chi2 filter."); | |
2667 | ||
2668 | // try attaching clusters to tracklets | |
6e39bde4 | 2669 | Int_t mlayers = 0; |
2670 | AliTRDcluster *cl = NULL; | |
be24510a | 2671 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f | 2672 | Int_t jLayer = planes[iLayer]; |
6e39bde4 | 2673 | Int_t nNotInChamber = 0; |
f29f13a6 | 2674 | if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue; |
6e39bde4 | 2675 | cseed[jLayer].Fit(); |
f29f13a6 | 2676 | cseed[jLayer].UpdateUsed(); |
6e39bde4 | 2677 | cseed[jLayer].ResetClusterIter(); |
2678 | while((cl = cseed[jLayer].NextCluster())){ | |
2679 | if(!cl->IsInChamber()) nNotInChamber++; | |
2680 | } | |
2681 | //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber); | |
2682 | 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 | |
d611c74f | 2683 | mlayers++; |
2684 | } | |
be24510a | 2685 | |
2686 | if(mlayers < kNSeedPlanes){ | |
2687 | //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes)); | |
2688 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2689 | continue; | |
2690 | } | |
2691 | ||
2692 | // temporary exit door for the HLT | |
4d6aee34 | 2693 | if(fkReconstructor->IsHLT()){ |
be24510a | 2694 | // attach clusters to extrapolation chambers |
2695 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ | |
2696 | Int_t jLayer = planesExt[iLayer]; | |
2697 | if(!(chamber = stack[jLayer])) continue; | |
f29f13a6 | 2698 | cseed[jLayer].AttachClusters(chamber, kTRUE); |
6e39bde4 | 2699 | cseed[jLayer].Fit(); |
be24510a | 2700 | } |
4302c900 | 2701 | fTrackQuality[ntracks] = 1.; // dummy value |
2702 | ntracks++; | |
218ba867 | 2703 | if(ntracks == kMaxTracksStack) return ntracks; |
4302c900 | 2704 | cseed += 6; |
2705 | continue; | |
2706 | } | |
2707 | ||
be24510a | 2708 | |
f29f13a6 | 2709 | // Update Seeds and calculate Likelihood |
d611c74f | 2710 | // fit tracklets and cook likelihood |
f29f13a6 | 2711 | FitTiltedRieman(&cseed[0], kTRUE); |
2712 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ | |
2713 | Int_t jLayer = planes[iLayer]; | |
2714 | cseed[jLayer].Fit(kTRUE); | |
2715 | } | |
91834b8d | 2716 | Double_t like = CookLikelihood(&cseed[0], planes); // to be checked |
d611c74f | 2717 | |
4d6aee34 | 2718 | if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){ |
d611c74f | 2719 | //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2720 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2721 | continue; | |
2722 | } | |
2723 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); | |
2724 | ||
2725 | // book preliminary results | |
2726 | seedQuality[ntracks] = like; | |
2727 | fSeedLayer[ntracks] = config;/*sLayer;*/ | |
2728 | ||
2729 | // attach clusters to the extrapolation seeds | |
be24510a | 2730 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2731 | Int_t jLayer = planesExt[iLayer]; | |
d611c74f | 2732 | if(!(chamber = stack[jLayer])) continue; |
d611c74f | 2733 | |
2734 | // fit extrapolated seed | |
2735 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; | |
2736 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; | |
2737 | AliTRDseedV1 pseed = cseed[jLayer]; | |
f29f13a6 | 2738 | if(!pseed.AttachClusters(chamber, kTRUE)) continue; |
2739 | pseed.Fit(kTRUE); | |
d611c74f | 2740 | cseed[jLayer] = pseed; |
d611c74f | 2741 | FitTiltedRieman(cseed, kTRUE); |
f29f13a6 | 2742 | cseed[jLayer].Fit(kTRUE); |
d611c74f | 2743 | } |
2744 | ||
2745 | // AliInfo("Extrapolation done."); | |
2746 | // Debug Stream containing all the 6 tracklets | |
4d6aee34 | 2747 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
2748 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); | |
d611c74f | 2749 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2750 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2751 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2752 | cstreamer << "MakeSeeds1" | |
2753 | << "EventNumber=" << eventNumber | |
2754 | << "CandidateNumber=" << candidateNumber | |
2755 | << "S0.=" << &cseed[0] | |
2756 | << "S1.=" << &cseed[1] | |
2757 | << "S2.=" << &cseed[2] | |
2758 | << "S3.=" << &cseed[3] | |
2759 | << "S4.=" << &cseed[4] | |
2760 | << "S5.=" << &cseed[5] | |
2761 | << "FitterT.=" << tiltedRieman | |
2762 | << "\n"; | |
2763 | } | |
2764 | ||
4d6aee34 | 2765 | if(fkReconstructor->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){ |
d611c74f | 2766 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2767 | continue; | |
2768 | } | |
2769 | //AliInfo("Improve seed quality done."); | |
2770 | ||
2771 | // fit full track and cook likelihoods | |
2772 | // Double_t curv = FitRieman(&cseed[0], chi2); | |
2773 | // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.); | |
2774 | // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.); | |
2775 | ||
2776 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) | |
2777 | Double_t chi2Vals[3]; | |
6e39bde4 | 2778 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE); |
4d6aee34 | 2779 | if(fkReconstructor->HasVertexConstrained()) |
d611c74f | 2780 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired |
2781 | else | |
2782 | chi2Vals[1] = 1.; | |
2783 | chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.); | |
2784 | // Chi2 definitions in testing stage | |
2785 | //chi2Vals[2] = GetChi2ZTest(&cseed[0]); | |
2786 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); | |
2787 | //AliInfo("Hyperplane fit done\n"); | |
fac58f00 | 2788 | |
4d6aee34 | 2789 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
2790 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); | |
d611c74f | 2791 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2792 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2793 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); | |
2794 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); | |
91834b8d | 2795 | Int_t ncls = 0; |
2796 | for(Int_t iseed = 0; iseed < kNPlanes; iseed++){ | |
2797 | ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0; | |
2798 | } | |
d611c74f | 2799 | cstreamer << "MakeSeeds2" |
2800 | << "EventNumber=" << eventNumber | |
2801 | << "CandidateNumber=" << candidateNumber | |
2802 | << "Chi2TR=" << chi2Vals[0] | |
2803 | << "Chi2TC=" << chi2Vals[1] | |
2804 | << "Nlayers=" << mlayers | |
91834b8d | 2805 | << "NClusters=" << ncls |
d611c74f | 2806 | << "Like=" << like |
2807 | << "S0.=" << &cseed[0] | |
2808 | << "S1.=" << &cseed[1] | |
2809 | << "S2.=" << &cseed[2] | |
2810 | << "S3.=" << &cseed[3] | |
2811 | << "S4.=" << &cseed[4] | |
2812 | << "S5.=" << &cseed[5] | |
d611c74f | 2813 | << "FitterT.=" << fitterT |
2814 | << "FitterTC.=" << fitterTC | |
2815 | << "\n"; | |
2816 | } | |
2817 | ||
2818 | ntracks++; | |
2819 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
2820 | if(ntracks == kMaxTracksStack){ | |
2821 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); | |
2822 | return ntracks; | |
2823 | } | |
2824 | cseed += 6; | |
41702fec | 2825 | } |
2826 | } | |
2827 | } | |
41702fec | 2828 | |
2829 | return ntracks; | |
e4f2f73d | 2830 | } |
2831 | ||
2832 | //_____________________________________________________________________________ | |
4d6aee34 | 2833 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(const AliTRDseedV1 * const seeds, Double_t *params) |
e4f2f73d | 2834 | { |
afa21247 | 2835 | // |
2836 | // Build a TRD track out of tracklet candidates | |
2837 | // | |
2838 | // Parameters : | |
2839 | // seeds : array of tracklets | |
2840 | // params : array of track parameters as they are estimated by stand alone tracker. 7 elements. | |
2841 | // [0] - radial position of the track at reference point | |
2842 | // [1] - y position of the fit at [0] | |
2843 | // [2] - z position of the fit at [0] | |
2844 | // [3] - snp of the first tracklet | |
2845 | // [4] - tgl of the first tracklet | |
2846 | // [5] - curvature of the Riemann fit - 1/pt | |
2847 | // [6] - sector rotation angle | |
2848 | // | |
2849 | // Output : | |
2850 | // The TRD track. | |
2851 | // | |
2852 | // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix | |
2853 | // (diagonal with constant variance terms TODO - correct parameterization) | |
2854 | // | |
2855 | // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the | |
2856 | // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation() | |
2857 | // for details). Do also MC label calculation and PID if propagation successfully. | |
41702fec | 2858 | |
afa21247 | 2859 | |
41702fec | 2860 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
2861 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; | |
2862 | Double_t c[15]; | |
2863 | ||
afa21247 | 2864 | c[ 0] = 0.2; // s^2_y |
2865 | c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z | |
2866 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp | |
2867 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl | |
2868 | 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 | 2869 | |
d20df6fc | 2870 | AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
2871 | track.PropagateTo(params[0]-5.0); | |
4d6aee34 | 2872 | AliTRDseedV1 *ptrTracklet = NULL; |
9887cc9f | 2873 | |
2874 | // skip Kalman filter for HLT | |
4d6aee34 | 2875 | if(fkReconstructor->IsHLT()){ |
9887cc9f | 2876 | for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) { |
2877 | track.UnsetTracklet(jLayer); | |
4d6aee34 | 2878 | ptrTracklet = const_cast<AliTRDseedV1 *>(&seeds[jLayer]); |
9887cc9f | 2879 | if(!ptrTracklet->IsOK()) continue; |
6e39bde4 | 2880 | if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian |
9887cc9f | 2881 | ptrTracklet = SetTracklet(ptrTracklet); |
f29f13a6 | 2882 | ptrTracklet->UseClusters(); |
91834b8d | 2883 | track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
2884 | } | |
d78d7df0 | 2885 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
799e38d7 | 2886 | ptrTrack->CookPID(); |
4d6aee34 | 2887 | ptrTrack->SetReconstructor(fkReconstructor); |
d78d7df0 | 2888 | return ptrTrack; |
91834b8d | 2889 | } |
393fda1c | 2890 | |
d20df6fc | 2891 | track.ResetCovariance(1); |
e79f8eb0 | 2892 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
4d6aee34 | 2893 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){ |
393fda1c | 2894 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2895 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2896 | Double_t p[5]; // Track Params for the Debug Stream | |
2897 | track.GetExternalParameters(params[0], p); | |
4d6aee34 | 2898 | TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
393fda1c | 2899 | cs << "MakeTrack" |
2900 | << "EventNumber=" << eventNumber | |
2901 | << "CandidateNumber=" << candidateNumber | |
2902 | << "nc=" << nc | |
2903 | << "X=" << params[0] | |
2904 | << "Y=" << p[0] | |
2905 | << "Z=" << p[1] | |
2906 | << "snp=" << p[2] | |
2907 | << "tnd=" << p[3] | |
2908 | << "crv=" << p[4] | |
2909 | << "Yin=" << params[1] | |
2910 | << "Zin=" << params[2] | |
2911 | << "snpin=" << params[3] | |
2912 | << "tndin=" << params[4] | |
2913 | << "crvin=" << params[5] | |
2914 | << "track.=" << &track | |
2915 | << "\n"; | |
2916 | } | |
4d6aee34 | 2917 | if (nc < 30) return NULL; |
d20df6fc | 2918 | |
2919 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); | |
4d6aee34 | 2920 | ptrTrack->SetReconstructor(fkReconstructor); |
48f8adf3 | 2921 | ptrTrack->CookLabel(.9); |
24253b0a | 2922 | |
d20df6fc | 2923 | // computes PID for track |
2924 | ptrTrack->CookPID(); | |
2925 | // update calibration references using this track | |
48f8adf3 | 2926 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
2927 | if (!calibra){ | |
2928 | AliInfo("Could not get Calibra instance\n"); | |
2929 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack); | |
2930 | } | |
d20df6fc | 2931 | return ptrTrack; |
e4f2f73d | 2932 | } |
2933 | ||
0906e73e | 2934 | |
e4f2f73d | 2935 | //____________________________________________________________________ |
eb38ed55 | 2936 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d | 2937 | { |
41702fec | 2938 | // |
2939 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst | |
2940 | // | |
2941 | // Parameters : | |
2942 | // layers : Array of propagation layers for a stack/supermodule | |
2943 | // cseed : Array of 6 seeding tracklets which has to be improved | |
2944 | // | |
f29f13a6 | 2945 | // Output : |
41702fec | 2946 | // cssed : Improved seeds |
2947 | // | |
2948 | // Detailed description | |
2949 | // | |
2950 | // Iterative procedure in which new clusters are searched for each | |
2951 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) | |
2952 | // can be maximized. If some optimization is found the old seeds are replaced. | |
2953 | // | |
2954 | // debug level: 7 | |
2955 | // | |
2956 | ||
2957 | // make a local working copy | |
4d6aee34 | 2958 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 2959 | AliTRDseedV1 bseed[6]; |
2960 | Int_t nLayers = 0; | |
2961 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer]; | |
2962 | ||
2963 | Float_t lastquality = 10000.0; | |
2964 | Float_t lastchi2 = 10000.0; | |
2965 | Float_t chi2 = 1000.0; | |
2966 | ||
2967 | for (Int_t iter = 0; iter < 4; iter++) { | |
2968 | Float_t sumquality = 0.0; | |
2969 | Float_t squality[6]; | |
2970 | Int_t sortindexes[6]; | |
2971 | ||
2972 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { | |
3a039a31 | 2973 | squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.; |
41702fec | 2974 | sumquality += squality[jLayer]; |
2975 | } | |
2976 | if ((sumquality >= lastquality) || (chi2 > lastchi2)) break; | |
2977 | ||
2978 | nLayers = 0; | |
2979 | lastquality = sumquality; | |
2980 | lastchi2 = chi2; | |
2981 | if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer]; | |
2982 | ||
2983 | TMath::Sort(6, squality, sortindexes, kFALSE); | |
2984 | for (Int_t jLayer = 5; jLayer > 1; jLayer--) { | |
2985 | Int_t bLayer = sortindexes[jLayer]; | |
2986 | if(!(chamber = stack[bLayer])) continue; | |
f29f13a6 | 2987 | bseed[bLayer].AttachClusters(chamber, kTRUE); |
2988 | bseed[bLayer].Fit(kTRUE); | |
41702fec | 2989 | if(bseed[bLayer].IsOK()) nLayers++; |
2990 | } | |
2991 | ||
2992 | chi2 = FitTiltedRieman(bseed, kTRUE); | |
4d6aee34 | 2993 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){ |
41702fec | 2994 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2995 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2996 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); | |
4d6aee34 | 2997 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 2998 | cstreamer << "ImproveSeedQuality" |
2999 | << "EventNumber=" << eventNumber | |
3000 | << "CandidateNumber=" << candidateNumber | |
3001 | << "Iteration=" << iter | |
3002 | << "S0.=" << &bseed[0] | |
3003 | << "S1.=" << &bseed[1] | |
3004 | << "S2.=" << &bseed[2] | |
3005 | << "S3.=" << &bseed[3] | |
3006 | << "S4.=" << &bseed[4] | |
3007 | << "S5.=" << &bseed[5] | |
3008 | << "FitterT.=" << tiltedRieman | |
3009 | << "\n"; | |
3010 | } | |
3011 | } // Loop: iter | |
41702fec | 3012 | // we are sure that at least 2 tracklets are OK ! |
3013 | return nLayers+2; | |
e4f2f73d | 3014 | } |
3015 | ||
eb38ed55 | 3016 | //_________________________________________________________________________ |
4d6aee34 | 3017 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){ |
41702fec | 3018 | // |
3019 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for | |
3020 | // the track selection | |
3021 | // The likelihood value containes: | |
3022 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit | |
3023 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets | |
3024 | // For all Parameters an exponential dependency is used | |
3025 | // | |
3026 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
3027 | // - Array of chi2 values: | |
3028 | // * Non-Constrained Tilted Riemann fit | |
3029 | // * Vertex-Constrained Tilted Riemann fit | |
3030 | // * z-Direction from Linear fit | |
3031 | // Output: - The calculated track likelihood | |
3032 | // | |
3033 | // debug level 2 | |
3034 | // | |
3035 | ||
f29f13a6 | 3036 | Double_t chi2phi = 0, nLayers = 0; |
41702fec | 3037 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
3038 | if(!tracklets[iLayer].IsOK()) continue; | |
f29f13a6 | 3039 | chi2phi += tracklets[iLayer].GetChi2Phi(); |
41702fec | 3040 | nLayers++; |
3041 | } | |
f29f13a6 | 3042 | chi2phi /= Float_t (nLayers - 2.0); |
41702fec | 3043 | |
3044 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z | |
4d6aee34 | 3045 | Double_t likeChi2TC = (fkReconstructor->HasVertexConstrained()) ? |
d20df6fc | 3046 | TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann |
6e39bde4 | 3047 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann |
3048 | Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23 | |
f29f13a6 | 3049 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi; |
41702fec | 3050 | |
4d6aee34 | 3051 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec | 3052 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3053 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 3054 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 3055 | cstreamer << "CalculateTrackLikelihood0" |
3056 | << "EventNumber=" << eventNumber | |
3057 | << "CandidateNumber=" << candidateNumber | |
3058 | << "LikeChi2Z=" << likeChi2Z | |
3059 | << "LikeChi2TR=" << likeChi2TR | |
3060 | << "LikeChi2TC=" << likeChi2TC | |
f29f13a6 | 3061 | << "LikeChi2Phi=" << likeChi2Phi |
41702fec | 3062 | << "TrackLikelihood=" << trackLikelihood |
3063 | << "\n"; | |
3064 | } | |
6e39bde4 | 3065 | |
41702fec | 3066 | return trackLikelihood; |
e4f2f73d | 3067 | } |
3068 | ||
3069 | //____________________________________________________________________ | |
91834b8d | 3070 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]) |
e4f2f73d | 3071 | { |
41702fec | 3072 | // |
3073 | // Calculate the probability of this track candidate. | |
3074 | // | |
3075 | // Parameters : | |
3076 | // cseeds : array of candidate tracklets | |
3077 | // planes : array of seeding planes (see seeding configuration) | |
3078 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. | |
3079 | // | |
3080 | // Output : | |
3081 | // likelihood value | |
3082 | // | |
3083 | // Detailed description | |
3084 | // | |
3085 | // The track quality is estimated based on the following 4 criteria: | |
3086 | // 1. precision of the rieman fit on the Y direction (likea) | |
3087 | // 2. chi2 on the Y direction (likechi2y) | |
3088 | // 3. chi2 on the Z direction (likechi2z) | |
3089 | // 4. number of attached clusters compared to a reference value | |
3090 | // (see AliTRDrecoParam::fkFindable) (likeN) | |
3091 | // | |
3092 | // The distributions for each type of probabilities are given below as of | |
3093 | // (date). They have to be checked to assure consistency of estimation. | |
3094 | // | |
3095 | ||
3096 | // ratio of the total number of clusters/track which are expected to be found by the tracker. | |
4d6aee34 | 3097 | const AliTRDrecoParam *fRecoPars = fkReconstructor->GetRecoParam(); |
41702fec | 3098 | |
91834b8d | 3099 | Double_t chi2y = GetChi2Y(&cseed[0]); |
3100 | Double_t chi2z = GetChi2Z(&cseed[0]); | |
3101 | ||
8ae98148 | 3102 | Float_t nclusters = 0.; |
41702fec | 3103 | Double_t sumda = 0.; |
3104 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ | |
3105 | Int_t jlayer = planes[ilayer]; | |
3106 | nclusters += cseed[jlayer].GetN2(); | |
e3cf3d02 | 3107 | sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1)); |
41702fec | 3108 | } |
8ae98148 | 3109 | nclusters *= .25; |
3110 | ||
5a2e200c | 3111 | Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope()); |
41702fec | 3112 | Double_t likechi2y = 0.0000000001; |
4d6aee34 | 3113 | if (fkReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope()); |
5a2e200c | 3114 | Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope()); |
8ae98148 | 3115 | Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters()); |
41702fec | 3116 | Double_t like = likea * likechi2y * likechi2z * likeN; |
3117 | ||
4d6aee34 | 3118 | if(fkReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec | 3119 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3120 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 3121 | Int_t nTracklets = 0; Float_t meanNcls = 0; |
91834b8d | 3122 | for(Int_t iseed=0; iseed < kNPlanes; iseed++){ |
3123 | if(!cseed[iseed].IsOK()) continue; | |
3124 | nTracklets++; | |
4d6aee34 | 3125 | meanNcls += cseed[iseed].GetN2(); |
91834b8d | 3126 | } |
4d6aee34 | 3127 | if(nTracklets) meanNcls /= nTracklets; |
41702fec | 3128 | // The Debug Stream contains the seed |
4d6aee34 | 3129 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 3130 | cstreamer << "CookLikelihood" |
3131 | << "EventNumber=" << eventNumber | |
3132 | << "CandidateNumber=" << candidateNumber | |
3133 | << "tracklet0.=" << &cseed[0] | |
3134 | << "tracklet1.=" << &cseed[1] | |
3135 | << "tracklet2.=" << &cseed[2] | |
3136 | << "tracklet3.=" << &cseed[3] | |
3137 | << "tracklet4.=" << &cseed[4] | |
3138 | << "tracklet5.=" << &cseed[5] | |
3139 | << "sumda=" << sumda | |
91834b8d | 3140 | << "chi2y=" << chi2y |
3141 | << "chi2z=" << chi2z | |
41702fec | 3142 | << "likea=" << likea |
3143 | << "likechi2y=" << likechi2y | |
3144 | << "likechi2z=" << likechi2z | |
3145 | << "nclusters=" << nclusters | |
3146 | << "likeN=" << likeN | |
3147 | << "like=" << like | |
4d6aee34 | 3148 | << "meanncls=" << meanNcls |
41702fec | 3149 | << "\n"; |
3150 | } | |
3151 | ||
3152 | return like; | |
e4f2f73d | 3153 | } |
3154 | ||
e4f2f73d | 3155 | //____________________________________________________________________ |
0906e73e | 3156 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d | 3157 | { |
41702fec | 3158 | // |
3159 | // Map seeding configurations to detector planes. | |
3160 | // | |
3161 | // Parameters : | |
3162 | // iconfig : configuration index | |
3163 | // planes : member planes of this configuration. On input empty. | |
3164 | // | |
3165 | // Output : | |
3166 | // planes : contains the planes which are defining the configuration | |
3167 | // | |
3168 | // Detailed description | |
3169 | // | |
3170 | // Here is the list of seeding planes configurations together with | |
3171 | // their topological classification: | |
3172 | // | |
3173 | // 0 - 5432 TQ 0 | |
3174 | // 1 - 4321 TQ 0 | |
3175 | // 2 - 3210 TQ 0 | |
3176 | // 3 - 5321 TQ 1 | |
3177 | // 4 - 4210 TQ 1 | |
3178 | // 5 - 5431 TQ 1 | |
3179 | // 6 - 4320 TQ 1 | |
3180 | // 7 - 5430 TQ 2 | |
3181 | // 8 - 5210 TQ 2 | |
3182 | // 9 - 5421 TQ 3 | |
3183 | // 10 - 4310 TQ 3 | |
3184 | // 11 - 5410 TQ 4 | |
3185 | // 12 - 5420 TQ 5 | |
3186 | // 13 - 5320 TQ 5 | |
3187 | // 14 - 5310 TQ 5 | |
3188 | // | |
3189 | // The topologic quality is modeled as follows: | |
3190 | // 1. The general model is define by the equation: | |
3191 | // p(conf) = exp(-conf/2) | |
3192 | // 2. According to the topologic classification, configurations from the same | |
3193 | // class are assigned the agerage value over the model values. | |
3194 | // 3. Quality values are normalized. | |
3195 | // | |
3196 | // The topologic quality distribution as function of configuration is given below: | |
3197 | //Begin_Html | |
3198 | // <img src="gif/topologicQA.gif"> | |
3199 | //End_Html | |
3200 | // | |
3201 | ||
3202 | switch(iconfig){ | |
3203 | case 0: // 5432 TQ 0 | |
3204 | planes[0] = 2; | |
3205 | planes[1] = 3; | |
3206 | planes[2] = 4; | |
3207 | planes[3] = 5; | |
3208 | break; | |
3209 | case 1: // 4321 TQ 0 | |
3210 | planes[0] = 1; | |
3211 | planes[1] = 2; | |
3212 | planes[2] = 3; | |
3213 | planes[3] = 4; | |
3214 | break; | |
3215 | case 2: // 3210 TQ 0 | |
3216 | planes[0] = 0; | |
3217 | planes[1] = 1; | |
3218 | planes[2] = 2; | |
3219 | planes[3] = 3; | |
3220 | break; | |
3221 | case 3: // 5321 TQ 1 | |
3222 | planes[0] = 1; | |
3223 | planes[1] = 2; | |
3224 | planes[2] = 3; | |
3225 | planes[3] = 5; | |
3226 | break; | |
3227 | case 4: // 4210 TQ 1 | |
3228 | planes[0] = 0; | |
3229 | planes[1] = 1; | |
3230 | planes[2] = 2; | |
3231 | planes[3] = 4; | |
3232 | break; | |
3233 | case 5: // 5431 TQ 1 | |
3234 | planes[0] = 1; | |
3235 | planes[1] = 3; | |
3236 | planes[2] = 4; | |
3237 | planes[3] = 5; | |
3238 | break; | |
3239 | case 6: // 4320 TQ 1 | |
3240 | planes[0] = 0; | |
3241 | planes[1] = 2; | |
3242 | planes[2] = 3; | |
3243 | planes[3] = 4; | |
3244 | break; | |
3245 | case 7: // 5430 TQ 2 | |
3246 | planes[0] = 0; | |
3247 | planes[1] = 3; | |
3248 | planes[2] = 4; | |
3249 | planes[3] = 5; | |
3250 | break; | |
3251 | case 8: // 5210 TQ 2 | |
3252 | planes[0] = 0; | |
3253 | planes[1] = 1; | |
3254 | planes[2] = 2; | |
3255 | planes[3] = 5; | |
3256 | break; | |
3257 | case 9: // 5421 TQ 3 | |
3258 | planes[0] = 1; | |
3259 | planes[1] = 2; | |
3260 | planes[2] = 4; | |
3261 | planes[3] = 5; | |
3262 | break; | |
3263 | case 10: // 4310 TQ 3 | |
3264 | planes[0] = 0; | |
3265 | planes[1] = 1; | |
3266 | planes[2] = 3; | |
3267 | planes[3] = 4; | |
3268 | break; | |
3269 | case 11: // 5410 TQ 4 | |
3270 | planes[0] = 0; | |
3271 | planes[1] = 1; | |
3272 | planes[2] = 4; | |
3273 | planes[3] = 5; | |
3274 | break; | |
3275 | case 12: // 5420 TQ 5 | |
3276 | planes[0] = 0; | |
3277 | planes[1] = 2; | |
3278 | planes[2] = 4; | |
3279 | planes[3] = 5; | |
3280 | break; | |
3281 | case 13: // 5320 TQ 5 | |
3282 | planes[0] = 0; | |
3283 | planes[1] = 2; | |
3284 | planes[2] = 3; | |
3285 | planes[3] = 5; | |
3286 | break; | |
3287 | case 14: // 5310 TQ 5 | |
3288 | planes[0] = 0; | |
3289 | planes[1] = 1; | |
3290 | planes[2] = 3; | |
3291 | planes[3] = 5; | |
3292 | break; | |
3293 | } | |
e4f2f73d | 3294 | } |
3295 | ||
3296 | //____________________________________________________________________ | |
0906e73e | 3297 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d | 3298 | { |
41702fec | 3299 | // |
3300 | // Returns the extrapolation planes for a seeding configuration. | |
3301 | // | |
3302 | // Parameters : | |
3303 | // iconfig : configuration index | |
3304 | // planes : planes which are not in this configuration. On input empty. | |
3305 | // | |
3306 | // Output : | |
3307 | // planes : contains the planes which are not in the configuration | |
3308 | // | |
3309 | // Detailed description | |
3310 | // | |
3311 | ||
3312 | switch(iconfig){ | |
3313 | case 0: // 5432 TQ 0 | |
3314 | planes[0] = 1; | |
3315 | planes[1] = 0; | |
3316 | break; | |
3317 | case 1: // 4321 TQ 0 | |
3318 | planes[0] = 5; | |
3319 | planes[1] = 0; | |
3320 | break; | |
3321 | case 2: // 3210 TQ 0 | |
3322 | planes[0] = 4; | |
3323 | planes[1] = 5; | |
3324 | break; | |
3325 | case 3: // 5321 TQ 1 | |
3326 | planes[0] = 4; | |
3327 | planes[1] = 0; | |
3328 | break; | |
3329 | case 4: // 4210 TQ 1 | |
3330 | planes[0] = 5; | |
3331 | planes[1] = 3; | |
3332 | break; | |
3333 | case 5: // 5431 TQ 1 | |
3334 | planes[0] = 2; | |
3335 | planes[1] = 0; | |
3336 | break; | |
3337 | case 6: // 4320 TQ 1 | |
3338 | planes[0] = 5; | |
3339 | planes[1] = 1; | |
3340 | break; | |
3341 | case 7: // 5430 TQ 2 | |
3342 | planes[0] = 2; | |
3343 | planes[1] = 1; | |
3344 | break; | |
3345 | case 8: // 5210 TQ 2 | |
3346 | planes[0] = 4; | |
3347 | planes[1] = 3; | |
3348 | break; | |
3349 | case 9: // 5421 TQ 3 | |
3350 | planes[0] = 3; | |
3351 | planes[1] = 0; | |
3352 | break; | |
3353 | case 10: // 4310 TQ 3 | |
3354 | planes[0] = 5; | |
3355 | planes[1] = 2; | |
3356 | break; | |
3357 | case 11: // 5410 TQ 4 | |
3358 | planes[0] = 3; | |
3359 | planes[1] = 2; | |
3360 | break; | |
3361 | case 12: // 5420 TQ 5 | |
3362 | planes[0] = 3; | |
3363 | planes[1] = 1; | |
3364 | break; | |
3365 | case 13: // 5320 TQ 5 | |
3366 | planes[0] = 4; | |
3367 | planes[1] = 1; | |
3368 | break; | |
3369 | case 14: // 5310 TQ 5 | |
3370 | planes[0] = 4; | |
3371 | planes[1] = 2; | |
3372 | break; | |
3373 | } | |
e4f2f73d | 3374 | } |
eb38ed55 | 3375 | |
3376 | //____________________________________________________________________ | |
3377 | AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const | |
3378 | { | |
41702fec | 3379 | Int_t ncls = fClusters->GetEntriesFast(); |
4d6aee34 | 3380 | return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL; |
eb38ed55 | 3381 | } |
3382 | ||
3b57a3f7 | 3383 | //____________________________________________________________________ |
3384 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const | |
3385 | { | |
41702fec | 3386 | Int_t ntrklt = fTracklets->GetEntriesFast(); |
4d6aee34 | 3387 | return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL; |
3b57a3f7 | 3388 | } |
3389 | ||
3390 | //____________________________________________________________________ | |
3391 | AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const | |
3392 | { | |
41702fec | 3393 | Int_t ntrk = fTracks->GetEntriesFast(); |
4d6aee34 | 3394 | return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL; |
3b57a3f7 | 3395 | } |
3396 | ||
6e39bde4 | 3397 | |
eb38ed55 | 3398 | |
fac58f00 | 3399 | // //_____________________________________________________________________________ |
3400 | // Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist | |
3401 | // , Int_t *outlist, Bool_t down) | |
3402 | // { | |
3403 | // // | |
3404 | // // Sort eleements according occurancy | |
3405 | // // The size of output array has is 2*n | |
3406 | // // | |
3407 | // | |
3408 | // if (n <= 0) { | |
3409 | // return 0; | |
3410 | // } | |
3411 | // | |
3412 | // Int_t *sindexS = new Int_t[n]; // Temporary array for sorting | |
3413 | // Int_t *sindexF = new Int_t[2*n]; | |
3414 | // for (Int_t i = 0; i < n; i++) { | |
3415 | // sindexF[i] = 0; | |
3416 | // } | |
3417 | // | |
3418 | // TMath::Sort(n,inlist,sindexS,down); | |
3419 | // | |
3420 | // Int_t last = inlist[sindexS[0]]; | |
3421 | // Int_t val = last; | |
3422 | // sindexF[0] = 1; | |
3423 | // sindexF[0+n] = last; | |
3424 | // Int_t countPos = 0; | |
3425 | // | |
3426 | // // Find frequency | |
3427 | // for (Int_t i = 1; i < n; i++) { | |
3428 | // val = inlist[sindexS[i]]; | |
3429 | // if (last == val) { | |
3430 | // sindexF[countPos]++; | |
3431 | // } | |
3432 | // else { | |
3433 | // countPos++; | |
3434 | // sindexF[countPos+n] = val; | |
3435 | // sindexF[countPos]++; | |
3436 | // last = val; | |
3437 | // } | |
3438 | // } | |
3439 | // if (last == val) { | |
3440 | // countPos++; | |
3441 | // } | |
3442 | // | |
3443 | // // Sort according frequency | |
3444 | // TMath::Sort(countPos,sindexF,sindexS,kTRUE); | |
3445 | // | |
3446 | // for (Int_t i = 0; i < countPos; i++) { | |
3447 | // outlist[2*i ] = sindexF[sindexS[i]+n]; | |
3448 | // outlist[2*i+1] = sindexF[sindexS[i]]; | |
3449 | // } | |
3450 | // | |
3451 | // delete [] sindexS; | |
3452 | // delete [] sindexF; | |
3453 | // | |
3454 | // return countPos; | |
3455 | // | |
3456 | // } | |
bb56afff | 3457 | |
06b32d95 | 3458 | |
d611c74f | 3459 | //____________________________________________________________________ |
3460 | void AliTRDtrackerV1::ResetSeedTB() | |
3461 | { | |
3462 | // reset buffer for seeding time bin layers. If the time bin | |
3463 | // layers are not allocated this function allocates them | |
3464 | ||
3465 | for(Int_t isl=0; isl<kNSeedPlanes; isl++){ | |
3466 | if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin(); | |
3467 | else fSeedTB[isl]->Clear(); | |
3468 | } | |
3469 | } | |
3470 | ||
e3cf3d02 | 3471 | |
3472 | //_____________________________________________________________________________ | |
4d6aee34 | 3473 | Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const |
e3cf3d02 | 3474 | { |
3475 | // Calculates normalized chi2 in y-direction | |
3476 | // chi2 = Sum chi2 / n_tracklets | |
3477 | ||
3478 | Double_t chi2 = 0.; Int_t n = 0; | |
3479 | for(Int_t ipl = kNPlanes; ipl--;){ | |
3480 | if(!tracklets[ipl].IsOK()) continue; | |
3481 | chi2 += tracklets[ipl].GetChi2Y(); | |
3482 | n++; | |
3483 | } | |
3484 | return n ? chi2/n : 0.; | |
3485 | } | |
3486 | ||
bb56afff | 3487 | //_____________________________________________________________________________ |
4d6aee34 | 3488 | Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const |
bb56afff | 3489 | { |
91834b8d | 3490 | // Calculates normalized chi2 in z-direction |
e3cf3d02 | 3491 | // chi2 = Sum chi2 / n_tracklets |
41702fec | 3492 | |
e3cf3d02 | 3493 | Double_t chi2 = 0; Int_t n = 0; |
3494 | for(Int_t ipl = kNPlanes; ipl--;){ | |
41702fec | 3495 | if(!tracklets[ipl].IsOK()) continue; |
e3cf3d02 | 3496 | chi2 += tracklets[ipl].GetChi2Z(); |
3497 | n++; | |
41702fec | 3498 | } |
e3cf3d02 | 3499 | return n ? chi2/n : 0.; |
bb56afff | 3500 | } |
8acca6a3 | 3501 | |
6e39bde4 | 3502 | //____________________________________________________________________ |
4d6aee34 | 3503 | Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const tracklets){ |
6e39bde4 | 3504 | // |
3505 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
3506 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
3507 | // are taken into account | |
3508 | // | |
3509 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
3510 | // | |
3511 | // Output: - The reference x-position(Float_t) | |
3512 | // Only kept for compatibility with the old code | |
3513 | // | |
3514 | Int_t nDistances = 0; | |
3515 | Float_t meanDistance = 0.; | |
3516 | Int_t startIndex = 5; | |
3517 | for(Int_t il =5; il > 0; il--){ | |
3518 | if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){ | |
3519 | Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0(); | |
3520 | meanDistance += xdiff; | |
3521 | nDistances++; | |
3522 | } | |
3523 | if(tracklets[il].IsOK()) startIndex = il; | |
3524 | } | |
3525 | if(tracklets[0].IsOK()) startIndex = 0; | |
3526 | if(!nDistances){ | |
3527 | // We should normally never get here | |
3528 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
3529 | Int_t iok = 0, idiff = 0; | |
3530 | // This attempt is worse and should be avoided: | |
3531 | // check for two chambers which are OK and repeat this without taking the mean value | |
3532 | // Strategy avoids a division by 0; | |
3533 | for(Int_t il = 5; il >= 0; il--){ | |
3534 | if(tracklets[il].IsOK()){ | |
3535 | xpos[iok] = tracklets[il].GetX0(); | |
3536 | iok++; | |
3537 | startIndex = il; | |
3538 | } | |
3539 | if(iok) idiff++; // to get the right difference; | |
3540 | if(iok > 1) break; | |
3541 | } | |
3542 | if(iok > 1){ | |
3543 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
3544 | } | |
3545 | else{ | |
3546 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
3547 | return 331.; | |
3548 | } | |
3549 | } | |
3550 | else{ | |
3551 | meanDistance /= nDistances; | |
3552 | } | |
3553 | return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
3554 | } | |
3555 | ||
3556 | //_____________________________________________________________________________ | |
4d6aee34 | 3557 | Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){ |
6e39bde4 | 3558 | // |
3559 | // Track Fitter Function using the new class implementation of | |
3560 | // the Rieman fit | |
3561 | // | |
3562 | AliTRDtrackFitterRieman fitter; | |
3563 | fitter.SetRiemanFitter(GetTiltedRiemanFitter()); | |
3564 | fitter.Reset(); | |
3565 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]); | |
3566 | Double_t chi2 = fitter.Eval(); | |
3567 | // Update the tracklets | |
3568 | Double_t cov[15]; Double_t x0; | |
3569 | memset(cov, 0, sizeof(Double_t) * 15); | |
3570 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){ | |
3571 | x0 = tracklets[il].GetX0(); | |
3572 | tracklets[il].SetYref(0, fitter.GetYat(x0)); | |
3573 | tracklets[il].SetZref(0, fitter.GetZat(x0)); | |
3574 | tracklets[il].SetYref(1, fitter.GetDyDxAt(x0)); | |
3575 | tracklets[il].SetZref(1, fitter.GetDzDx()); | |
3576 | tracklets[il].SetC(fitter.GetCurvature()); | |
3577 | fitter.GetCovAt(x0, cov); | |
3578 | tracklets[il].SetCovRef(cov); | |
3579 | tracklets[il].SetChi2(chi2); | |
3580 | } | |
3581 | return chi2; | |
3582 | } | |
3583 | ||
8acca6a3 | 3584 | /////////////////////////////////////////////////////// |
3585 | // // | |
3586 | // Resources of class AliTRDLeastSquare // | |
3587 | // // | |
3588 | /////////////////////////////////////////////////////// | |
3589 | ||
3590 | //_____________________________________________________________________________ | |
3591 | AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){ | |
41702fec | 3592 | // |
3593 | // Constructor of the nested class AliTRDtrackFitterLeastSquare | |
3594 | // | |
3595 | memset(fParams, 0, sizeof(Double_t) * 2); | |
3596 | memset(fSums, 0, sizeof(Double_t) * 5); | |
3597 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); | |
8acca6a3 | 3598 | |
3599 | } | |
3600 | ||
3601 | //_____________________________________________________________________________ | |
4d6aee34 | 3602 | void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){ |
41702fec | 3603 | // |
3604 | // Adding Point to the fitter | |
3605 | // | |
2ed81ab2 | 3606 | Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9); |
3607 | weight *= weight; | |
4d6aee34 | 3608 | const Double_t &xpt = *x; |
41702fec | 3609 | // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY); |
3610 | fSums[0] += weight; | |
3611 | fSums[1] += weight * xpt; | |
3612 | fSums[2] += weight * y; | |
3613 | fSums[3] += weight * xpt * y; | |
3614 | fSums[4] += weight * xpt * xpt; | |
3615 | fSums[5] += weight * y * y; | |
8acca6a3 | 3616 | } |
3617 | ||
3618 | //_____________________________________________________________________________ | |
4d6aee34 | 3619 | void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){ |
41702fec | 3620 | // |
3621 | // Remove Point from the sample | |
3622 | // | |
2ed81ab2 | 3623 | |
3624 | Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9); | |
3625 | weight *= weight; | |
4d6aee34 | 3626 | const Double_t &xpt = *x; |
41702fec | 3627 | fSums[0] -= weight; |
3628 | fSums[1] -= weight * xpt; | |
3629 | fSums[2] -= weight * y; | |
3630 | fSums[3] -= weight * xpt * y; | |
3631 | fSums[4] -= weight * xpt * xpt; | |
3632 | fSums[5] -= weight * y * y; | |
8acca6a3 | 3633 | } |
3634 | ||
3635 | //_____________________________________________________________________________ | |
3636 | void AliTRDtrackerV1::AliTRDLeastSquare::Eval(){ | |
41702fec | 3637 | // |
3638 | // Evaluation of the fit: | |
3639 | // Calculation of the parameters | |
3640 | // Calculation of the covariance matrix | |
3641 | // | |
3642 | ||
3643 | Double_t denominator = fSums[0] * fSums[4] - fSums[1] *fSums[1]; | |
aec26713 | 3644 | if(denominator==0) return; |
3645 | ||
41702fec | 3646 | // for(Int_t isum = 0; isum < 5; isum++) |
3647 | // printf("fSums[%d] = %f\n", isum, fSums[isum]); | |
3648 | // printf("denominator = %f\n", denominator); | |
3649 | fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/ denominator; | |
3650 | fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2]) / denominator; | |
3651 | // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]); | |
3652 | ||
3653 | // Covariance matrix | |
2ed81ab2 | 3654 | fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]); |
3655 | fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]); | |
3656 | fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]); | |
8acca6a3 | 3657 | } |
3658 | ||
46b6abd7 | 3659 | //_____________________________________________________________________________ |
4d6aee34 | 3660 | Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const { |
41702fec | 3661 | // |
3662 | // Returns the Function value of the fitted function at a given x-position | |
3663 | // | |
3664 | return fParams[0] + fParams[1] * (*xpos); | |
46b6abd7 | 3665 | } |
3666 | ||
3667 | //_____________________________________________________________________________ | |
3668 | void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const { | |
41702fec | 3669 | // |
3670 | // Copies the values of the covariance matrix into the storage | |
3671 | // | |
3672 | memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3); | |
46b6abd7 | 3673 | } |
3674 | ||
6e39bde4 | 3675 | //_____________________________________________________________________________ |
3676 | void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){ | |
3677 | // | |
3678 | // Reset the fitter | |
3679 | // | |
3680 | memset(fParams, 0, sizeof(Double_t) * 2); | |
3681 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); | |
3682 | memset(fSums, 0, sizeof(Double_t) * 6); | |
3683 | } | |
3684 | ||
3685 | /////////////////////////////////////////////////////// | |
3686 | // // | |
3687 | // Resources of class AliTRDtrackFitterRieman // | |
3688 | // // | |
3689 | /////////////////////////////////////////////////////// | |
3690 | ||
3691 | //_____________________________________________________________________________ | |
3692 | AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman(): | |
3693 | fTrackFitter(NULL), | |
3694 | fZfitter(NULL), | |
3695 | fCovarPolY(NULL), | |
3696 | fCovarPolZ(NULL), | |
3697 | fXref(0.), | |
3698 | fSysClusterError(0.) | |
3699 | { | |
3700 | // | |
3701 | // Default constructor | |
3702 | // | |
3703 | fZfitter = new AliTRDLeastSquare; | |
3704 | fCovarPolY = new TMatrixD(3,3); | |
3705 | fCovarPolZ = new TMatrixD(2,2); | |
3706 | memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6); | |
3707 | memset(fParameters, 0, sizeof(Double_t) * 5); | |
3708 | memset(fSumPolY, 0, sizeof(Double_t) * 5); | |
3709 | memset(fSumPolZ, 0, sizeof(Double_t) * 2); | |
3710 | } | |
3711 | ||
3712 | //_____________________________________________________________________________ | |
3713 | AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){ | |
3714 | // | |
3715 | // Destructor | |
3716 | // | |
3717 | if(fZfitter) delete fZfitter; | |
3718 | if(fCovarPolY) delete fCovarPolY; | |
3719 | if(fCovarPolZ) delete fCovarPolZ; | |
3720 | } | |
3721 | ||
3722 | //_____________________________________________________________________________ | |
3723 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){ | |
3724 | // | |
3725 | // Reset the Fitter | |
3726 | // | |
3727 | if(fTrackFitter){ | |
3728 | fTrackFitter->StoreData(kTRUE); | |
3729 | fTrackFitter->ClearPoints(); | |
3730 | } | |
3731 | if(fZfitter){ | |
3732 | fZfitter->Reset(); | |
3733 | } | |
3734 | fXref = 0.; | |
3735 | memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer); | |
3736 | memset(fParameters, 0, sizeof(Double_t) * 5); | |
3737 | memset(fSumPolY, 0, sizeof(Double_t) * 5); | |
3738 | memset(fSumPolZ, 0, sizeof(Double_t) * 2); | |
3739 | for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++) | |
3740 | for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){ | |
3741 | (*fCovarPolY)(irow, icol) = 0.; | |
3742 | if(irow < 2 && icol < 2) | |
3743 | (*fCovarPolZ)(irow, icol) = 0.; | |
3744 | } | |
3745 | } | |
3746 | ||
3747 | //_____________________________________________________________________________ | |
3748 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){ | |
3749 | // | |
3750 | // Add tracklet into the fitter | |
3751 | // | |
3752 | if(itr >= AliTRDgeometry::kNlayer) return; | |
3753 | fTracklets[itr] = tracklet; | |
3754 | } | |
3755 | ||
3756 | //_____________________________________________________________________________ | |
3757 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){ | |
3758 | // | |
3759 | // Perform the fit | |
3760 | // 1. Apply linear transformation and store points in the fitter | |
3761 | // 2. Evaluate the fit | |
3762 | // 3. Check if the result of the fit in z-direction is reasonable | |
3763 | // if not | |
3764 | // 3a. Fix the parameters 3 and 4 with the results of a simple least | |
3765 | // square fit | |
3766 | // 3b. Redo the fit with the fixed parameters | |
3767 | // 4. Store fit results (parameters and errors) | |
3768 | // | |
3769 | if(!fTrackFitter){ | |
3770 | return 1e10; | |
3771 | } | |
3772 | fXref = CalculateReferenceX(); | |
3773 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]); | |
3774 | if(!fTrackFitter->GetNpoints()) return 1e10; | |
3775 | // perform the fit | |
3776 | fTrackFitter->Eval(); | |
3777 | fZfitter->Eval(); | |
3778 | fParameters[3] = fTrackFitter->GetParameter(3); | |
3779 | fParameters[4] = fTrackFitter->GetParameter(4); | |
3780 | if(!CheckAcceptable(fParameters[3], fParameters[4])) { | |
3781 | fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref)); | |
3782 | fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1)); | |
3783 | fTrackFitter->Eval(); | |
3784 | fTrackFitter->ReleaseParameter(3); | |
3785 | fTrackFitter->ReleaseParameter(4); | |
3786 | fParameters[3] = fTrackFitter->GetParameter(3); | |
3787 | fParameters[4] = fTrackFitter->GetParameter(4); | |
3788 | } | |
3789 | // Update the Fit Parameters and the errors | |
3790 | fParameters[0] = fTrackFitter->GetParameter(0); | |
3791 | fParameters[1] = fTrackFitter->GetParameter(1); | |
3792 | fParameters[2] = fTrackFitter->GetParameter(2); | |
3793 | ||
3794 | // Prepare Covariance estimation | |
3795 | (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4]; | |
3796 | (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1]; | |
3797 | (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2]; | |
3798 | (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3]; | |
3799 | fCovarPolY->Invert(); | |
3800 | (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2]; | |
3801 | (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1]; | |
3802 | fCovarPolZ->Invert(); | |
3803 | return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints(); | |
3804 | } | |
3805 | ||
3806 | //_____________________________________________________________________________ | |
4d6aee34 | 3807 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(AliTRDseedV1 * const tracklet){ |
6e39bde4 | 3808 | // |
3809 | // Does the transformations and updates the fitters | |
3810 | // The following transformation is applied | |
3811 | // | |
3812 | AliTRDcluster *cl = NULL; | |
3813 | Double_t x, y, z, dx, t, w, we, yerr, zerr; | |
3814 | Double_t uvt[4]; | |
3815 | if(!tracklet || !tracklet->IsOK()) return; | |
3816 | Double_t tilt = tracklet->GetTilt(); | |
3817 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ | |
3818 | if(!(cl = tracklet->GetClusters(itb))) continue; | |
3819 | if(!cl->IsInChamber()) continue; | |
3820 | if (!tracklet->IsUsable(itb)) continue; | |
3821 | x = cl->GetX(); | |
3822 | y = cl->GetY(); | |
3823 | z = cl->GetZ(); | |
3824 | dx = x - fXref; | |
3825 | // Transformation | |
3826 | t = 1./(x*x + y*y); | |
3827 | uvt[0] = 2. * x * t; | |
3828 | uvt[1] = t; | |
3829 | uvt[2] = 2. * tilt * t; | |
3830 | uvt[3] = 2. * tilt * dx * t; | |
3831 | w = 2. * (y + tilt*z) * t; | |
3832 | // error definition changes for the different calls | |
3833 | we = 2. * t; | |
3834 | we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()); | |
3835 | // Update sums for error calculation | |
3836 | yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError); | |
3837 | yerr *= yerr; | |
3838 | zerr = 1./cl->GetSigmaZ2(); | |
3839 | for(Int_t ipol = 0; ipol < 5; ipol++){ | |
3840 | fSumPolY[ipol] += yerr; | |
3841 | yerr *= x; | |
3842 | if(ipol < 3){ | |
3843 | fSumPolZ[ipol] += zerr; | |
3844 | zerr *= x; | |
3845 | } | |
3846 | } | |
3847 | fTrackFitter->AddPoint(uvt, w, we); | |
3848 | fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
3849 | } | |
3850 | } | |
3851 | ||
3852 | //_____________________________________________________________________________ | |
3853 | Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){ | |
3854 | // | |
3855 | // Check whether z-results are acceptable | |
3856 | // Definition: Distance between tracklet fit and track fit has to be | |
3857 | // less then half a padlength | |
3858 | // Point of comparision is at the anode wire | |
3859 | // | |
3860 | Bool_t acceptablez = kTRUE; | |
3861 | Double_t zref = 0.0; | |
3862 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
3863 | if(!fTracklets[iLayer]->IsOK()) continue; | |
3864 | zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref); | |
3865 | if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0) | |
3866 | acceptablez = kFALSE; | |
3867 | } | |
3868 | return acceptablez; | |
3869 | } | |
3870 | ||
3871 | //_____________________________________________________________________________ | |
3872 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const { | |
3873 | // | |
3874 | // Calculate y position out of the track parameters | |
3875 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
3876 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
3877 | // R = Sqrt() = 1/Curvature | |
3878 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
3879 | // | |
3880 | Double_t y = 0; | |
3881 | Double_t disc = (x * fParameters[0] + fParameters[1]); | |
3882 | disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc; | |
3883 | if (disc >= 0) { | |
3884 | disc = TMath::Sqrt(disc); | |
3885 | y = (1.0 - disc) / fParameters[0]; | |
3886 | } | |
3887 | return y; | |
3888 | } | |
3889 | ||
3890 | //_____________________________________________________________________________ | |
3891 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const { | |
3892 | // | |
3893 | // Return z position for a given x position | |
3894 | // Simple linear function | |
3895 | // | |
3896 | return fParameters[3] + fParameters[4] * (x - fXref); | |
3897 | } | |
3898 | ||
3899 | //_____________________________________________________________________________ | |
3900 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const { | |
3901 | // | |
3902 | // Calculate dydx at a given radial position out of the track parameters | |
3903 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
3904 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
3905 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
3906 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
3907 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
3908 | // | |
3909 | Double_t x0 = -fParameters[1] / fParameters[0]; | |
3910 | Double_t curvature = GetCurvature(); | |
3911 | Double_t dy = 0; | |
3912 | if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) { | |
3913 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
3914 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); | |
3915 | if (fParameters[0] < 0) yderiv *= -1.0; | |
3916 | dy = yderiv; | |
3917 | } | |
3918 | } | |
3919 | return dy; | |
3920 | } | |
3921 | ||
3922 | //_____________________________________________________________________________ | |
3923 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const { | |
3924 | // | |
3925 | // Calculate track curvature | |
3926 | // | |
3927 | // | |
3928 | Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0]; | |
3929 | if (curvature > 0.0) | |
3930 | curvature = fParameters[0] / TMath::Sqrt(curvature); | |
3931 | return curvature; | |
3932 | } | |
3933 | ||
3934 | //_____________________________________________________________________________ | |
3935 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const { | |
3936 | // | |
3937 | // Error Definition according to gauss error propagation | |
3938 | // | |
3939 | TMatrixD transform(3,3); | |
3940 | transform(0,0) = transform(1,1) = transform(2,2) = 1; | |
3941 | transform(0,1) = transform(1,2) = x; | |
3942 | transform(0,2) = x*x; | |
3943 | TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY); | |
3944 | covariance *= transform.T(); | |
3945 | cov[0] = covariance(0,0); | |
3946 | TMatrixD transformZ(2,2); | |
3947 | transformZ(0,0) = transformZ(1,1) = 1; | |
3948 | transformZ(0,1) = x; | |
3949 | TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ); | |
3950 | covarZ *= transformZ.T(); | |
3951 | cov[1] = covarZ(0,0); | |
3952 | cov[2] = 0; | |
3953 | } | |
3954 | ||
3955 | //____________________________________________________________________ | |
3956 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){ | |
3957 | // | |
3958 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
3959 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
3960 | // are taken into account | |
3961 | // | |
3962 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
3963 | // | |
3964 | // Output: - The reference x-position(Float_t) | |
3965 | // | |
3966 | Int_t nDistances = 0; | |
3967 | Float_t meanDistance = 0.; | |
3968 | Int_t startIndex = 5; | |
3969 | for(Int_t il =5; il > 0; il--){ | |
3970 | if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){ | |
3971 | Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0(); | |
3972 | meanDistance += xdiff; | |
3973 | nDistances++; | |
3974 | } | |
3975 | if(fTracklets[il]->IsOK()) startIndex = il; | |
3976 | } | |
3977 | if(fTracklets[0]->IsOK()) startIndex = 0; | |
3978 | if(!nDistances){ | |
3979 | // We should normally never get here | |
3980 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
3981 | Int_t iok = 0, idiff = 0; | |
3982 | // This attempt is worse and should be avoided: | |
3983 | // check for two chambers which are OK and repeat this without taking the mean value | |
3984 | // Strategy avoids a division by 0; | |
3985 | for(Int_t il = 5; il >= 0; il--){ | |
3986 | if(fTracklets[il]->IsOK()){ | |
3987 | xpos[iok] = fTracklets[il]->GetX0(); | |
3988 | iok++; | |
3989 | startIndex = il; | |
3990 | } | |
3991 | if(iok) idiff++; // to get the right difference; | |
3992 | if(iok > 1) break; | |
3993 | } | |
3994 | if(iok > 1){ | |
3995 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
3996 | } | |
3997 | else{ | |
3998 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
3999 | return 331.; | |
4000 | } | |
4001 | } | |
4002 | else{ | |
4003 | meanDistance /= nDistances; | |
4004 | } | |
4005 | return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
4006 | } |