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e4f2f73d | 1 | /************************************************************************** |
972ef65e | 2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
e4f2f73d | 15 | |
16 | /* $Id$ */ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // Track finder // | |
21 | // // | |
22 | // Authors: // | |
23 | // Alex Bercuci <A.Bercuci@gsi.de> // | |
24 | // Markus Fasel <M.Fasel@gsi.de> // | |
25 | // // | |
26 | /////////////////////////////////////////////////////////////////////////////// | |
27 | ||
e4f2f73d | 28 | #include <TBranch.h> |
bb56afff | 29 | #include <TDirectory.h> |
e4f2f73d | 30 | #include <TLinearFitter.h> |
e4f2f73d | 31 | #include <TTree.h> |
32 | #include <TClonesArray.h> | |
e4f2f73d | 33 | #include <TTreeStream.h> |
eb2b4f91 | 34 | #include <TGeoMatrix.h> |
35 | #include <TGeoManager.h> | |
e4f2f73d | 36 | |
37 | #include "AliLog.h" | |
fac58f00 | 38 | #include "AliMathBase.h" |
e4f2f73d | 39 | #include "AliESDEvent.h" |
bb56afff | 40 | #include "AliGeomManager.h" |
e4f2f73d | 41 | #include "AliRieman.h" |
42 | #include "AliTrackPointArray.h" | |
43 | ||
e4f2f73d | 44 | #include "AliTRDgeometry.h" |
45 | #include "AliTRDpadPlane.h" | |
e4f2f73d | 46 | #include "AliTRDcalibDB.h" |
e4f2f73d | 47 | #include "AliTRDReconstructor.h" |
48 | #include "AliTRDCalibraFillHisto.h" | |
e4f2f73d | 49 | #include "AliTRDrecoParam.h" |
bb56afff | 50 | |
51 | #include "AliTRDcluster.h" | |
828c6f80 | 52 | #include "AliTRDdigitsParam.h" |
e4f2f73d | 53 | #include "AliTRDseedV1.h" |
0906e73e | 54 | #include "AliTRDtrackV1.h" |
bb56afff | 55 | #include "AliTRDtrackerV1.h" |
56 | #include "AliTRDtrackerDebug.h" | |
57 | #include "AliTRDtrackingChamber.h" | |
58 | #include "AliTRDchamberTimeBin.h" | |
59 | ||
e4f2f73d | 60 | ClassImp(AliTRDtrackerV1) |
903326c1 | 61 | ClassImp(AliTRDtrackerV1::AliTRDLeastSquare) |
62 | ClassImp(AliTRDtrackerV1::AliTRDtrackFitterRieman) | |
eb38ed55 | 63 | |
2f4384e6 | 64 | AliTRDtrackerV1::ETRDtrackerV1BetheBloch AliTRDtrackerV1::fgBB = AliTRDtrackerV1::kGeant; |
d76231c8 | 65 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
6e39bde4 | 66 | 0.5112, 0.5112, 0.5112, 0.0786, 0.0786, |
41702fec | 67 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, |
68 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 | |
e165b64b | 69 | }; |
70 | const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = { | |
71 | 300.2, 312.8, 325.4, 338.0, 350.6, 363.2}; | |
952051c5 | 72 | // Number of Time Bins/chamber should be also stored independently by the traker |
73 | // (also in AliTRDReconstructor) in oder to be able to run HLT. Fix TODO | |
2985ffcb | 74 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
4d6aee34 | 75 | AliRieman* AliTRDtrackerV1::fgRieman = NULL; |
76 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL; | |
77 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL; | |
e4f2f73d | 78 | |
79 | //____________________________________________________________________ | |
33ab3872 | 80 | AliTRDtrackerV1::AliTRDtrackerV1(const AliTRDReconstructor *rec) |
41702fec | 81 | :AliTracker() |
4d6aee34 | 82 | ,fkReconstructor(NULL) |
9e85cb05 | 83 | ,fkRecoParam(NULL) |
4d6aee34 | 84 | ,fGeom(NULL) |
85 | ,fClusters(NULL) | |
86 | ,fTracklets(NULL) | |
87 | ,fTracks(NULL) | |
b1135f96 | 88 | ,fTracksESD(NULL) |
41702fec | 89 | ,fSieveSeeding(0) |
9dcc64cc | 90 | ,fEventInFile(-1) |
e4f2f73d | 91 | { |
41702fec | 92 | // |
93 | // Default constructor. | |
94 | // | |
eb2b4f91 | 95 | |
96 | SetReconstructor(rec); // initialize reconstructor | |
97 | ||
98 | // initialize geometry | |
99 | if(!AliGeomManager::GetGeometry()){ | |
100 | AliFatal("Could not get geometry."); | |
101 | } | |
102 | fGeom = new AliTRDgeometry(); | |
103 | fGeom->CreateClusterMatrixArray(); | |
4d6aee34 | 104 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 105 | Double_t loc[] = {0., 0., 0.}; |
106 | Double_t glb[] = {0., 0., 0.}; | |
107 | for(Int_t ily=kNPlanes; ily--;){ | |
e165b64b | 108 | Int_t ism = 0; |
109 | while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++; | |
110 | if(!matrix){ | |
111 | AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily)); | |
112 | fR[ily] = fgkX0[ily]; | |
eb2b4f91 | 113 | continue; |
114 | } | |
115 | matrix->LocalToMaster(loc, glb); | |
116 | fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); | |
117 | } | |
118 | ||
eb2b4f91 | 119 | // initialize cluster containers |
053767a4 | 120 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
3a039a31 | 121 | |
eb2b4f91 | 122 | // initialize arrays |
123 | memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t)); | |
124 | memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t)); | |
125 | memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*)); | |
b1135f96 | 126 | fTracksESD = new TClonesArray("AliESDtrack", 2*kMaxTracksStack); |
ddfbc51a | 127 | fTracksESD->SetOwner(); |
eb38ed55 | 128 | } |
129 | ||
e4f2f73d | 130 | //____________________________________________________________________ |
131 | AliTRDtrackerV1::~AliTRDtrackerV1() | |
132 | { | |
41702fec | 133 | // |
134 | // Destructor | |
135 | // | |
136 | ||
4d6aee34 | 137 | if(fgRieman) delete fgRieman; fgRieman = NULL; |
138 | if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL; | |
139 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL; | |
d611c74f | 140 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl]; |
b1135f96 | 141 | if(fTracksESD){ fTracksESD->Delete(); delete fTracksESD; } |
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 | ||
9e85cb05 | 168 | if(!fkRecoParam){ |
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 | } | |
980d5a2a | 180 | AliInfo(Form("Number of tracks: !TRDin[%d]", ntracks)); |
41702fec | 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 | ||
e3d45279 | 272 | if(!fClusters || !fClusters->GetEntriesFast()){ |
273 | AliInfo("No TRD clusters"); | |
274 | return 0; | |
275 | } | |
2a3191bb | 276 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor |
e3d45279 | 277 | if (!calibra) AliInfo("Could not get Calibra instance"); |
c6f7c6cb | 278 | if (!fgNTimeBins) fgNTimeBins = fkReconstructor->GetNTimeBins(); |
828c6f80 | 279 | |
eb2b4f91 | 280 | // Define scalers |
4b5b4c5b | 281 | const Int_t nSeeders(2); |
282 | Int_t nFound[nSeeders] = {0}, // number of tracks found | |
283 | nBacked = 0, // number of tracks backed up for refit | |
284 | nSeeds = 0, // total number of ESD seeds | |
285 | nTRDseeds = 0, // number of seeds in the TRD acceptance | |
286 | nSeeder[nSeeders]= {0}, // number of ITS/TPC potential seeds | |
287 | nGoodSeeds[nSeeders]= {0}; // number of ITS/TPC found seeds | |
41702fec | 288 | Float_t foundMin = 20.0; |
4b5b4c5b | 289 | const Char_t *seeder[] = {"ITS", "TPC"}; |
290 | Float_t *quality[nSeeders] = {0}; | |
291 | Int_t *index[nSeeders] = {0}, | |
292 | *idxESD[nSeeders] = {0}; // esd index of track | |
9dcc64cc | 293 | fEventInFile = event->GetEventNumberInFile(); |
eb2b4f91 | 294 | nSeeds = event->GetNumberOfTracks(); |
295 | // Sort tracks according to quality | |
296 | // (covariance in the yz plane) | |
297 | if(nSeeds){ | |
4b5b4c5b | 298 | // first check TPC seeds |
299 | quality[1] = new Float_t[nSeeds]; memset(quality[1], 0, nSeeds*sizeof(Float_t)); | |
300 | idxESD[1] = new Int_t[nSeeds]; | |
301 | for (Int_t iSeed(nSeeds); iSeed--;) { | |
302 | AliESDtrack *seed = event->GetTrack(iSeed); | |
303 | if(!(seed->GetStatus()&AliESDtrack::kTPCout)) continue; | |
304 | Double_t covariance[15]; | |
305 | seed->GetExternalCovariance(covariance); | |
306 | idxESD[1][nSeeder[1]] = iSeed; | |
307 | quality[1][nSeeder[1]] = covariance[0] + covariance[2]; | |
308 | nSeeder[1]++; | |
309 | } | |
310 | index[1] = new Int_t[4*nSeeder[1]]; | |
311 | TMath::Sort(nSeeder[1], quality[1], index[1], kFALSE); | |
312 | // second check rest of tracks for ITS seeds | |
313 | quality[0] = new Float_t[nSeeds]; memset(quality[0], 0, nSeeds*sizeof(Float_t)); | |
314 | idxESD[0] = new Int_t[nSeeds]; | |
315 | for (Int_t iSeed(nSeeds); iSeed--;) { | |
d611c74f | 316 | AliESDtrack *seed = event->GetTrack(iSeed); |
4b5b4c5b | 317 | if((seed->GetStatus()&AliESDtrack::kTPCout)) continue; |
d611c74f | 318 | Double_t covariance[15]; |
319 | seed->GetExternalCovariance(covariance); | |
4b5b4c5b | 320 | idxESD[0][nSeeder[0]] = iSeed; |
321 | quality[0][nSeeder[0]] = covariance[0] + covariance[2]; | |
322 | nSeeder[0]++; | |
d611c74f | 323 | } |
4b5b4c5b | 324 | index[0] = new Int_t[4*nSeeder[0]]; |
325 | TMath::Sort(nSeeder[0], quality[0], index[0], kFALSE); | |
41702fec | 326 | } |
4b5b4c5b | 327 | |
eb2b4f91 | 328 | // Propagate all seeds |
41702fec | 329 | Int_t expectedClr; |
330 | AliTRDtrackV1 track; | |
4b5b4c5b | 331 | for(Int_t iSeeder(nSeeders); iSeeder--;){ |
332 | for (Int_t iSeed = 0; iSeed < nSeeder[iSeeder]; iSeed++) { | |
333 | Int_t currentIndexESD = idxESD[iSeeder][index[iSeeder][iSeed]]; | |
334 | // Get the seeds in sorted sequence | |
335 | AliESDtrack *seed = event->GetTrack(currentIndexESD); | |
336 | Float_t p4 = seed->GetC(seed->GetBz()); | |
eb2b4f91 | 337 | |
4b5b4c5b | 338 | // Check the seed status |
339 | ULong_t status(seed->GetStatus()); Bool_t kTPC(kTRUE); | |
340 | if ((status & AliESDtrack::kTRDout) != 0) continue; | |
341 | if (status & AliESDtrack::kTPCout){ | |
342 | AliDebug(2, Form("Found TPC seed @ idx[%4d] Sxy=%f[cm].", currentIndexESD, TMath::Sqrt(quality[iSeeder][index[iSeeder][iSeed]]))); | |
343 | // set steering parameters for TPC | |
344 | //fkRecoParam->SetTrackParam(kTPC); | |
345 | } else { | |
346 | if (status & AliESDtrack::kITSout){ | |
347 | // rotate | |
348 | Float_t globalToTracking = AliTRDgeometry::GetAlpha()*(Int_t(seed->GetAlpha()/AliTRDgeometry::GetAlpha()) + (seed->GetAlpha()>0. ? 0.5 : -0.5)); | |
349 | AliDebug(2, Form("Found ITS seed @ idx[%4d] Sxy=%f[cm] alpha=%7.2f[deg] g2T=%7.2f[deg]", currentIndexESD, TMath::Sqrt(quality[iSeeder][index[iSeeder][iSeed]]), seed->GetAlpha()*TMath::RadToDeg(), globalToTracking*TMath::RadToDeg())); | |
350 | if(!seed->Rotate(globalToTracking)){ | |
351 | AliDebug(1, Form("ITS seed @ idx[%4d] failed rotation of alpha=%7.2f[deg] g2T=%7.2f[deg].", currentIndexESD, seed->GetAlpha()*TMath::RadToDeg(), globalToTracking*TMath::RadToDeg())); | |
352 | continue; | |
353 | } | |
354 | kTPC=kFALSE; | |
355 | // set steering parameters for ITS | |
356 | //fkRecoParam->SetTrackParam(kITS); | |
357 | } else { | |
358 | AliDebug(1, Form("Bad seed[%4d] ITSin[%c] ITSout[%c] TPCin[%c] TPCout[%c].", currentIndexESD, | |
359 | (status&AliESDtrack::kITSin)?'y':'n', (status&AliESDtrack::kITSout)?'y':'n', (status&AliESDtrack::kTPCin)?'y':'n', (status&AliESDtrack::kTPCout)?'y':'n')); | |
360 | continue; | |
361 | } | |
362 | } | |
363 | ||
364 | // Propagate to the entrance in the TRD mother volume | |
365 | track.~AliTRDtrackV1(); | |
366 | new(&track) AliTRDtrackV1(*seed); | |
367 | if(AliTRDgeometry::GetXtrdBeg() > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), AliTRDReconstructor::GetMaxStep())){ | |
368 | //seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
369 | continue; | |
370 | } | |
371 | if(!AdjustSector(&track)){ | |
372 | //seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
373 | continue; | |
374 | } | |
375 | if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) { | |
376 | //seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
377 | continue; | |
378 | } | |
379 | AliDebug(2, Form("Propagate %s seed[%4d] ESDidx[%4d].", seeder[iSeeder], iSeed, currentIndexESD)); | |
380 | nGoodSeeds[iSeeder]++; | |
381 | // store track status at TRD entrance | |
382 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
383 | ||
384 | // prepare track and do propagation in the TRD | |
385 | track.SetReconstructor(fkReconstructor); | |
386 | track.SetKink(Bool_t(seed->GetKinkIndex(0))); | |
387 | track.SetPrimary(status & AliESDtrack::kTPCin); | |
388 | track.SetNonTPCseeded(!kTPC); | |
389 | expectedClr = FollowBackProlongation(track); | |
41702fec | 390 | // save calibration object |
4b5b4c5b | 391 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0) { |
224f357f | 392 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); |
393 | calibTrack->SetOwner(); | |
394 | seed->AddCalibObject(calibTrack); | |
395 | } | |
4b5b4c5b | 396 | // printf("track idx[%4d] nCl[%3d] TrkIn[%p]\n", index[iSeed], expectedClr, (void*)track.GetTrackIn()); |
41702fec | 397 | |
4b5b4c5b | 398 | // check if track entered the TRD fiducial volume |
399 | if(!track.GetTrackIn()){ | |
400 | AliDebug(2, Form("TRD missed by %s seed[%4d] ESDidx[%4d].", seeder[iSeeder], iSeed, currentIndexESD)); | |
401 | continue; | |
402 | } | |
403 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); | |
404 | nTRDseeds++; | |
41702fec | 405 | |
4b5b4c5b | 406 | // check if track was stopped in the TRD |
407 | if(expectedClr==-999){ | |
408 | AliDebug(1, Form("Track @ idx[%4d] failed prolongation due to track error [%d]", currentIndexESD, track.GetStatusTRD())); | |
409 | continue; | |
410 | } else if(expectedClr==0){ | |
411 | AliDebug(1, Form("Track @ idx[%4d] failed prolongation due to layer error [%d %d %d %d %d %d]", currentIndexESD, | |
412 | track.GetStatusTRD(0), track.GetStatusTRD(1), track.GetStatusTRD(2), track.GetStatusTRD(3), track.GetStatusTRD(4), track.GetStatusTRD(5))); | |
413 | continue; | |
414 | } else { | |
ef6f0bda | 415 | AliDebug(2, Form("Track @ idx[%4d] #cl[%3d] expect[%+3d]", currentIndexESD, track.GetNumberOfClusters(), expectedClr)); |
4b5b4c5b | 416 | nFound[kTPC]++; |
417 | // compute PID | |
418 | track.CookPID(); | |
419 | //compute MC label | |
420 | track.CookLabel(1. - AliTRDReconstructor::GetLabelFraction()); | |
421 | // update calibration references using this track | |
422 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); | |
423 | //update ESD track | |
424 | seed->UpdateTrackParams(&track, expectedClr>0?AliESDtrack::kTRDout:AliESDtrack::kTRDStop); | |
425 | seed->SetTRDBudget(track.GetBudget(0)); | |
426 | track.UpdateESDtrack(seed); | |
427 | if(expectedClr<0) continue; | |
428 | } | |
429 | ||
430 | // Make backup for back propagation | |
431 | if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) || (track.Pt() > 0.8)) { | |
432 | Int_t foundClr = track.GetNumberOfClusters(); | |
433 | if (foundClr >= foundMin) { | |
434 | //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); | |
435 | ||
436 | // Sign only gold tracks | |
437 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { | |
438 | //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track); | |
439 | } | |
440 | Bool_t isGold = kFALSE; | |
441 | ||
442 | // Full gold track | |
443 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { | |
444 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
b453ef55 | 445 | nBacked++; |
41702fec | 446 | isGold = kTRUE; |
447 | } | |
4b5b4c5b | 448 | |
449 | // Almost gold track | |
450 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { | |
451 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); | |
452 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
453 | nBacked++; | |
454 | isGold = kTRUE; | |
455 | } | |
456 | ||
457 | if ((!isGold) && (track.GetBackupTrack())) { | |
458 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { | |
459 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); | |
460 | nBacked++; | |
461 | isGold = kTRUE; | |
462 | } | |
463 | } | |
41702fec | 464 | } |
41702fec | 465 | } |
4b5b4c5b | 466 | |
467 | // Propagation to the TOF | |
468 | if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) { | |
469 | Int_t sm = track.GetSector(); | |
470 | // default value in case we have problems with the geometry. | |
471 | Double_t xtof = 371.; | |
472 | //Calculate radial position of the beginning of the TOF | |
473 | //mother volume. In order to avoid mixing of the TRD | |
474 | //and TOF modules some hard values are needed. This are: | |
475 | //1. The path to the TOF module. | |
476 | //2. The width of the TOF (29.05 cm) | |
477 | //(with the help of Annalisa de Caro Mar-17-2009) | |
478 | if(gGeoManager){ | |
479 | gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm)); | |
480 | TGeoHMatrix *m = NULL; | |
481 | Double_t loc[]={0., 0., -.5*29.05}, glob[3]; | |
482 | ||
483 | if((m=gGeoManager->GetCurrentMatrix())){ | |
484 | m->LocalToMaster(loc, glob); | |
485 | xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]); | |
486 | } | |
eb2b4f91 | 487 | } |
4b5b4c5b | 488 | if(xtof > (AliTRDReconstructor::GetMaxStep() + track.GetX()) && !PropagateToX(track, xtof, AliTRDReconstructor::GetMaxStep())){ |
489 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
490 | continue; | |
491 | } | |
492 | if(!AdjustSector(&track)){ | |
493 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
494 | continue; | |
495 | } | |
496 | if(TMath::Abs(track.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){ | |
497 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); | |
498 | continue; | |
499 | } | |
500 | //seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); | |
501 | // TODO obsolete - delete | |
502 | seed->SetTRDQuality(track.StatusForTOF()); | |
41702fec | 503 | } |
504 | } | |
4b5b4c5b | 505 | if(index[iSeeder]) delete [] index[iSeeder]; |
506 | if(idxESD[iSeeder]) delete [] idxESD[iSeeder]; | |
507 | if(quality[iSeeder]) delete [] quality[iSeeder]; | |
41702fec | 508 | } |
41702fec | 509 | |
4b5b4c5b | 510 | AliInfo(Form("Number of seeds: ITSout[%4d] TPCout[%4d] TRDin[%4d]", nGoodSeeds[0], nGoodSeeds[1], nTRDseeds)); |
511 | AliInfo(Form("Number of tracks: TRDout[%4d = %4d + %4d] TRDbackup[%4d]", nFound[0]+nFound[1], nFound[0], nFound[1], nBacked)); | |
d4cf71ca | 512 | |
d611c74f | 513 | // run stand alone tracking |
4d6aee34 | 514 | if (fkReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec | 515 | |
516 | return 0; | |
0906e73e | 517 | } |
518 | ||
519 | ||
520 | //____________________________________________________________________ | |
521 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) | |
522 | { | |
41702fec | 523 | // |
524 | // Refits tracks within the TRD. The ESD event is expected to contain seeds | |
525 | // at the outer part of the TRD. | |
526 | // The tracks are propagated to the innermost time bin | |
527 | // of the TRD and the ESD event is updated | |
528 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) | |
529 | // | |
530 | ||
531 | Int_t nseed = 0; // contor for loaded seeds | |
532 | Int_t found = 0; // contor for updated TRD tracks | |
533 | ||
534 | ||
e3d45279 | 535 | if(!fClusters || !fClusters->GetEntriesFast()){ |
536 | AliInfo("No TRD clusters"); | |
537 | return 0; | |
538 | } | |
41702fec | 539 | AliTRDtrackV1 track; |
540 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { | |
541 | AliESDtrack *seed = event->GetTrack(itrack); | |
050875b0 | 542 | ULong_t status = seed->GetStatus(); |
ef6f0bda | 543 | // reject tracks which did not entered TRD from bellow (also produced by the TRD stand alone tracker) |
544 | if(!(status & AliESDtrack::kTRDin)) continue; | |
545 | // reject TRD tracks with no clusters. This condition is softer than previously used | |
546 | // !(status & AliESDtrack::kTRDout) | |
547 | // since it allows also tracks stopped | |
548 | if(!seed->GetTRDncls()) continue; | |
549 | // check back-up quality | |
050875b0 | 550 | new(&track) AliTRDtrackV1(*seed); |
41702fec | 551 | if (track.GetX() < 270.0) { |
552 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); | |
553 | continue; | |
554 | } | |
ef6f0bda | 555 | nseed++; |
41702fec | 556 | |
557 | track.ResetCovariance(50.0); | |
558 | ||
559 | // do the propagation and processing | |
560 | Bool_t kUPDATE = kFALSE; | |
ef6f0bda | 561 | Double_t xToGo = 250.;//(status & AliESDtrack::kTPCout)?250.0:.1; |
41702fec | 562 | if(FollowProlongation(track)){ |
e3cf3d02 | 563 | // Update the friend track |
2d73d21c | 564 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
4d6aee34 | 565 | TObject *o = NULL; Int_t ic = 0; |
566 | AliTRDtrackV1 *calibTrack = NULL; | |
e3cf3d02 | 567 | while((o = seed->GetCalibObject(ic++))){ |
568 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; | |
a310e49b | 569 | calibTrack->SetTrackOut(&track); |
e3cf3d02 | 570 | } |
41702fec | 571 | } |
a310e49b | 572 | |
573 | // Prolongate to TPC | |
426bee9a | 574 | if (PropagateToX(track, xToGo, AliTRDReconstructor::GetMaxStep())) { // -with update |
a310e49b | 575 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
576 | found++; | |
577 | kUPDATE = kTRUE; | |
578 | } | |
e3cf3d02 | 579 | } |
41702fec | 580 | |
581 | // Prolongate to TPC without update | |
582 | if(!kUPDATE) { | |
583 | AliTRDtrackV1 tt(*seed); | |
426bee9a | 584 | if (PropagateToX(tt, xToGo, AliTRDReconstructor::GetMaxStep())) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup); |
41702fec | 585 | } |
586 | } | |
980d5a2a | 587 | AliInfo(Form("Number of seeds: TRDout[%d]", nseed)); |
588 | AliInfo(Form("Number of tracks: TRDrefit[%d]", found)); | |
41702fec | 589 | |
590 | return 0; | |
0906e73e | 591 | } |
592 | ||
0906e73e | 593 | //____________________________________________________________________ |
594 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) | |
595 | { | |
41702fec | 596 | // Extrapolates the TRD track in the TPC direction. |
597 | // | |
598 | // Parameters | |
599 | // t : the TRD track which has to be extrapolated | |
600 | // | |
601 | // Output | |
602 | // number of clusters attached to the track | |
603 | // | |
604 | // Detailed description | |
605 | // | |
606 | // Starting from current radial position of track <t> this function | |
607 | // extrapolates the track through the 6 TRD layers. The following steps | |
608 | // are being performed for each plane: | |
609 | // 1. prepare track: | |
610 | // a. get plane limits in the local x direction | |
611 | // b. check crossing sectors | |
612 | // c. check track inclination | |
613 | // 2. search tracklet in the tracker list (see GetTracklet() for details) | |
614 | // 3. evaluate material budget using the geo manager | |
615 | // 4. propagate and update track using the tracklet information. | |
616 | // | |
617 | // Debug level 2 | |
618 | // | |
619 | ||
620 | Int_t nClustersExpected = 0; | |
e3cf3d02 | 621 | for (Int_t iplane = kNPlanes; iplane--;) { |
17896e82 | 622 | Int_t index(-1); |
41702fec | 623 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
17896e82 | 624 | AliDebug(2, Form("Tracklet[%p] ly[%d] idx[%d]", (void*)tracklet, iplane, index)); |
41702fec | 625 | if(!tracklet) continue; |
980d5a2a | 626 | if(!tracklet->IsOK()){ |
627 | AliDebug(1, Form("Tracklet Det[%d] !OK", tracklet->GetDetector())); | |
628 | continue; | |
629 | } | |
e3cf3d02 | 630 | Double_t x = tracklet->GetX();//GetX0(); |
41702fec | 631 | // reject tracklets which are not considered for inward refit |
4b5b4c5b | 632 | if(x > t.GetX()+AliTRDReconstructor::GetMaxStep()){ |
633 | AliDebug(2, Form("Reject x[%7.3f] > track[%7.3f]", x, t.GetX()+AliTRDReconstructor::GetMaxStep())); | |
634 | continue; | |
635 | } | |
41702fec | 636 | // append tracklet to track |
637 | t.SetTracklet(tracklet, index); | |
638 | ||
952051c5 | 639 | if (x < (t.GetX()-AliTRDReconstructor::GetMaxStep()) && !PropagateToX(t, x+AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) break; |
41702fec | 640 | if (!AdjustSector(&t)) break; |
641 | ||
642 | // Start global position | |
643 | Double_t xyz0[3]; | |
644 | t.GetXYZ(xyz0); | |
645 | ||
646 | // End global position | |
647 | Double_t alpha = t.GetAlpha(), y, z; | |
648 | if (!t.GetProlongation(x,y,z)) break; | |
649 | Double_t xyz1[3]; | |
650 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
651 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
652 | xyz1[2] = z; | |
653 | ||
51a23065 | 654 | Double_t length = TMath::Sqrt( |
655 | (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) + | |
656 | (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) + | |
657 | (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2]) | |
658 | ); | |
659 | if(length>0.){ | |
660 | // Get material budget | |
661 | Double_t param[7]; | |
662 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break; | |
663 | Double_t xrho= param[0]*param[4]; | |
664 | Double_t xx0 = param[1]; // Get mean propagation parameters | |
665 | ||
666 | // Propagate and update | |
667 | t.PropagateTo(x, xx0, xrho); | |
668 | if (!AdjustSector(&t)) break; | |
669 | } | |
e3cf3d02 | 670 | |
b72f4eaf | 671 | Double_t cov[3]; tracklet->GetCovAt(x, cov); |
672 | Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()}; | |
673 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); | |
ef867f55 | 674 | if (chi2 < 1e+10 && ((AliExternalTrackParam&)t).Update(p, cov)){ |
675 | // Register info to track | |
676 | t.SetNumberOfClusters(); | |
677 | t.UpdateChi2(chi2); | |
41702fec | 678 | nClustersExpected += tracklet->GetN(); |
679 | } | |
680 | } | |
681 | ||
9e85cb05 | 682 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){ |
41702fec | 683 | Int_t index; |
51a23065 | 684 | for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){ |
41702fec | 685 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
686 | if(!tracklet) continue; | |
687 | t.SetTracklet(tracklet, index); | |
688 | } | |
689 | ||
a2fbb6ec | 690 | if(fkReconstructor->IsDebugStreaming()){ |
691 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
692 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); | |
693 | AliTRDtrackV1 track(t); | |
694 | track.SetOwner(); | |
695 | cstreamer << "FollowProlongation" | |
696 | << "EventNumber=" << eventNumber | |
697 | << "ncl=" << nClustersExpected | |
698 | << "track.=" << &track | |
699 | << "\n"; | |
700 | } | |
41702fec | 701 | } |
41702fec | 702 | return nClustersExpected; |
0906e73e | 703 | |
704 | } | |
705 | ||
706 | //_____________________________________________________________________________ | |
707 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) | |
708 | { | |
afa21247 | 709 | // Extrapolates/Build the TRD track in the TOF direction. |
710 | // | |
711 | // Parameters | |
712 | // t : the TRD track which has to be extrapolated | |
713 | // | |
714 | // Output | |
715 | // number of clusters attached to the track | |
716 | // | |
717 | // Starting from current radial position of track <t> this function | |
718 | // extrapolates the track through the 6 TRD layers. The following steps | |
719 | // are being performed for each plane: | |
720 | // 1. Propagate track to the entrance of the next chamber: | |
721 | // - get chamber limits in the radial direction | |
722 | // - check crossing sectors | |
723 | // - check track inclination | |
724 | // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary()) | |
725 | // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only | |
726 | // Kalman filter is needed and tracklets are already linked to the track this step is skipped. | |
727 | // 3. Fit tracklet using the information from the Kalman filter. | |
728 | // 4. Propagate and update track at reference radial position of the tracklet. | |
729 | // 5. Register tracklet with the tracker and track; update pulls monitoring. | |
730 | // | |
731 | // Observation | |
2a3191bb | 732 | // 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: |
733 | // - AliTRDtrackV1::kProlongation : track prolongation failed | |
734 | // - AliTRDtrackV1::kPropagation : track prolongation failed | |
735 | // - AliTRDtrackV1::kAdjustSector : failed during sector crossing | |
736 | // - AliTRDtrackV1::kSnp : too large bending | |
737 | // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet | |
738 | // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet | |
739 | // - AliTRDtrackV1::kUnknown : anything which is not covered before | |
afa21247 | 740 | // 2. By default the status of the track before first TRD update is saved. |
741 | // | |
742 | // Debug level 2 | |
743 | // | |
744 | // Author | |
745 | // Alexandru Bercuci <A.Bercuci@gsi.de> | |
746 | // | |
41702fec | 747 | |
eb2b4f91 | 748 | Int_t n = 0; |
749 | Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); | |
4d6aee34 | 750 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 751 | |
9e85cb05 | 752 | Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) : 0; |
7c3eecb8 | 753 | TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0; |
754 | ||
36574ea4 | 755 | Bool_t kStoreIn(kTRUE), // toggel store track params. at TRD entry |
68f9b6bd | 756 | kStandAlone(kFALSE), // toggle tracker awarness of stand alone seeding |
757 | kUseTRD(fkRecoParam->IsOverPtThreshold(t.Pt()));// use TRD measurment to update Kalman | |
758 | ||
759 | Int_t startLayer(0); | |
4d6aee34 | 760 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
68f9b6bd | 761 | // Special case for stand alone tracking |
762 | // - store all tracklets found by seeding | |
763 | // - start propagation from first tracklet found | |
181d2c97 | 764 | AliTRDseedV1 *tracklets[kNPlanes]; |
765 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); | |
68f9b6bd | 766 | for(Int_t ip(kNPlanes); ip--;){ |
767 | if(!(tracklets[ip] = t.GetTracklet(ip))) continue; | |
181d2c97 | 768 | t.UnsetTracklet(ip); |
68f9b6bd | 769 | if(tracklets[ip]->IsOK()) startLayer=ip; |
770 | kStandAlone = kTRUE; | |
0b559d95 | 771 | kUseTRD = kTRUE; |
181d2c97 | 772 | } |
68f9b6bd | 773 | AliDebug(4, Form("SA[%c] Start[%d]\n" |
774 | " [0]idx[%d] traklet[%p]\n" | |
775 | " [1]idx[%d] traklet[%p]\n" | |
776 | " [2]idx[%d] traklet[%p]\n" | |
777 | " [3]idx[%d] traklet[%p]\n" | |
778 | " [4]idx[%d] traklet[%p]\n" | |
779 | " [5]idx[%d] traklet[%p]" | |
780 | , kStandAlone?'y':'n', startLayer | |
781 | , t.GetTrackletIndex(0), (void*)tracklets[0] | |
782 | , t.GetTrackletIndex(1), (void*)tracklets[1] | |
783 | , t.GetTrackletIndex(2), (void*)tracklets[2] | |
784 | , t.GetTrackletIndex(3), (void*)tracklets[3] | |
785 | , t.GetTrackletIndex(4), (void*)tracklets[4] | |
786 | , t.GetTrackletIndex(5), (void*)tracklets[5])); | |
e3cf3d02 | 787 | |
053767a4 | 788 | // Loop through the TRD layers |
4d6aee34 | 789 | TGeoHMatrix *matrix = NULL; |
3e860707 | 790 | Double_t x(0.), y(0.), z(0.); |
68f9b6bd | 791 | for (Int_t ily=startLayer, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) { |
1bd708e3 | 792 | AliDebug(2, Form("Propagate to x[%d] = %7.2f", ily, fR[ily])); |
793 | ||
eb2b4f91 | 794 | // rough estimate of the entry point |
795 | if (!t.GetProlongation(fR[ily], y, z)){ | |
4b5b4c5b | 796 | n= n?-n:-999; |
34b5e42d | 797 | t.SetErrStat(AliTRDtrackV1::kProlongation); |
1bd708e3 | 798 | AliDebug(4, Form("Failed Rough Prolongation to ly[%d] x[%7.2f] y[%7.2f] z[%7.2f]", ily, fR[ily], y, z)); |
eb2b4f91 | 799 | break; |
800 | } | |
41702fec | 801 | |
eb2b4f91 | 802 | // find sector / stack / detector |
803 | sm = t.GetSector(); | |
804 | // TODO cross check with y value ! | |
805 | stk = fGeom->GetStack(z, ily); | |
806 | det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1; | |
4d6aee34 | 807 | matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL; |
eb2b4f91 | 808 | |
809 | // check if supermodule/chamber is installed | |
810 | if( !fGeom->GetSMstatus(sm) || | |
811 | stk<0. || | |
812 | fGeom->IsHole(ily, stk, sm) || | |
813 | !matrix ){ | |
1bd708e3 | 814 | AliDebug(4, Form("Missing Geometry ly[%d]. Guess radial position", ily)); |
eb2b4f91 | 815 | // propagate to the default radial position |
952051c5 | 816 | if(fR[ily] > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, fR[ily], AliTRDReconstructor::GetMaxStep())){ |
4b5b4c5b | 817 | n= n?-n:-999; |
34b5e42d | 818 | t.SetErrStat(AliTRDtrackV1::kPropagation); |
1bd708e3 | 819 | AliDebug(4, "Failed Propagation [Missing Geometry]"); |
41702fec | 820 | break; |
821 | } | |
eb2b4f91 | 822 | if(!AdjustSector(&t)){ |
4b5b4c5b | 823 | n= n?-n:-999; |
34b5e42d | 824 | t.SetErrStat(AliTRDtrackV1::kAdjustSector); |
1bd708e3 | 825 | AliDebug(4, "Failed Adjust Sector [Missing Geometry]"); |
eb2b4f91 | 826 | break; |
827 | } | |
952051c5 | 828 | if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()){ |
4b5b4c5b | 829 | n= n?-n:-999; |
34b5e42d | 830 | t.SetErrStat(AliTRDtrackV1::kSnp); |
1bd708e3 | 831 | AliDebug(4, "Failed Max Snp [Missing Geometry]"); |
eb2b4f91 | 832 | break; |
833 | } | |
34b5e42d | 834 | t.SetErrStat(AliTRDtrackV1::kGeometry, ily); |
41702fec | 835 | continue; |
836 | } | |
e3cf3d02 | 837 | |
eb2b4f91 | 838 | // retrieve rotation matrix for the current chamber |
839 | Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.}; | |
840 | Double_t glb[] = {0., 0., 0.}; | |
841 | matrix->LocalToMaster(loc, glb); | |
4b5b4c5b | 842 | AliDebug(3, Form("Propagate to D%3d[%02d_%d_%d] x_anode[%7.2f] (%f %f)", det, sm, stk, ily, glb[0]+driftLength, glb[1], glb[2])); |
eb2b4f91 | 843 | |
844 | // Propagate to the radial distance of the current layer | |
952051c5 | 845 | x = glb[0] - AliTRDReconstructor::GetMaxStep(); |
846 | if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())){ | |
4b5b4c5b | 847 | n= n?-n:-999; |
34b5e42d | 848 | t.SetErrStat(AliTRDtrackV1::kPropagation); |
4b5b4c5b | 849 | AliDebug(4, Form("Failed Propagation to x[%7.2f]", x)); |
eb2b4f91 | 850 | break; |
851 | } | |
852 | if(!AdjustSector(&t)){ | |
4b5b4c5b | 853 | n= n?-n:-999; |
34b5e42d | 854 | t.SetErrStat(AliTRDtrackV1::kAdjustSector); |
1bd708e3 | 855 | AliDebug(4, "Failed Adjust Sector Start"); |
eb2b4f91 | 856 | break; |
857 | } | |
952051c5 | 858 | if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) { |
4b5b4c5b | 859 | n= n?-n:-999; |
34b5e42d | 860 | t.SetErrStat(AliTRDtrackV1::kSnp); |
952051c5 | 861 | AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp())); |
eb2b4f91 | 862 | break; |
863 | } | |
4d6aee34 | 864 | Bool_t doRecalculate = kFALSE; |
eb2b4f91 | 865 | if(sm != t.GetSector()){ |
4b5b4c5b | 866 | AliDebug(3, Form("Track crossed sectors %2d -> %2d", sm, t.GetSector())); |
eb2b4f91 | 867 | sm = t.GetSector(); |
4d6aee34 | 868 | doRecalculate = kTRUE; |
eb2b4f91 | 869 | } |
870 | if(stk != fGeom->GetStack(z, ily)){ | |
4b5b4c5b | 871 | AliDebug(3, Form("Track crossed stacks %d -> %d in sec[%02d]", stk, fGeom->GetStack(z, ily), sm)); |
eb2b4f91 | 872 | stk = fGeom->GetStack(z, ily); |
4d6aee34 | 873 | doRecalculate = kTRUE; |
eb2b4f91 | 874 | } |
4d6aee34 | 875 | if(doRecalculate){ |
eb2b4f91 | 876 | det = AliTRDgeometry::GetDetector(ily, stk, sm); |
877 | if(!(matrix = fGeom->GetClusterMatrix(det))){ | |
34b5e42d | 878 | t.SetErrStat(AliTRDtrackV1::kGeometry, ily); |
1bd708e3 | 879 | AliDebug(4, Form("Failed Geometry Matrix ly[%d]", ily)); |
eb2b4f91 | 880 | continue; |
881 | } | |
882 | matrix->LocalToMaster(loc, glb); | |
952051c5 | 883 | x = glb[0] - AliTRDReconstructor::GetMaxStep(); |
eb2b4f91 | 884 | } |
885 | ||
886 | // check if track is well inside fiducial volume | |
952051c5 | 887 | if (!t.GetProlongation(x+AliTRDReconstructor::GetMaxStep(), y, z)) { |
4b5b4c5b | 888 | n= n?-n:-999; |
34b5e42d | 889 | t.SetErrStat(AliTRDtrackV1::kProlongation); |
952051c5 | 890 | AliDebug(4, Form("Failed Prolongation to x[%7.2f] y[%7.2f] z[%7.2f]", x+AliTRDReconstructor::GetMaxStep(), y, z)); |
eb2b4f91 | 891 | break; |
892 | } | |
893 | if(fGeom->IsOnBoundary(det, y, z, .5)){ | |
34b5e42d | 894 | t.SetErrStat(AliTRDtrackV1::kBoundary, ily); |
1bd708e3 | 895 | AliDebug(4, "Failed Track on Boundary"); |
eb2b4f91 | 896 | continue; |
897 | } | |
4b5b4c5b | 898 | // mark track as entering the FIDUCIAL volume of TRD |
899 | if(kStoreIn){ | |
900 | t.SetTrackIn(); | |
901 | kStoreIn = kFALSE; | |
902 | } | |
b1957d3c | 903 | |
eb2b4f91 | 904 | ptrTracklet = tracklets[ily]; |
905 | if(!ptrTracklet){ // BUILD TRACKLET | |
1bd708e3 | 906 | AliDebug(3, Form("Building tracklet det[%d]", det)); |
eb2b4f91 | 907 | // check data in supermodule |
908 | if(!fTrSec[sm].GetNChambers()){ | |
34b5e42d | 909 | t.SetErrStat(AliTRDtrackV1::kNoClusters, ily); |
4b5b4c5b | 910 | AliDebug(4, Form("Failed NoClusters in sec[%02d]", sm)); |
eb2b4f91 | 911 | continue; |
912 | } | |
913 | if(fTrSec[sm].GetX(ily) < 1.){ | |
34b5e42d | 914 | t.SetErrStat(AliTRDtrackV1::kNoClusters, ily); |
4b5b4c5b | 915 | AliDebug(4, Form("Failed NoX in sec[%02d]", sm)); |
eb2b4f91 | 916 | continue; |
917 | } | |
918 | ||
919 | // check data in chamber | |
920 | if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){ | |
34b5e42d | 921 | t.SetErrStat(AliTRDtrackV1::kNoClusters, ily); |
4b5b4c5b | 922 | AliDebug(4, Form("Failed No Data for D%03d[%02d_%d_%d]", AliTRDgeometry::GetDetector(ily, stk, sm), sm, stk, ily)); |
eb2b4f91 | 923 | continue; |
924 | } | |
9e85cb05 | 925 | if(chamber->GetNClusters() < fgNTimeBins*fkRecoParam ->GetFindableClusters()){ |
34b5e42d | 926 | t.SetErrStat(AliTRDtrackV1::kNoClusters, ily); |
4b5b4c5b | 927 | AliDebug(4, Form("Failed Not Enough Clusters[%2d] for D%03d[%02d_%d_%d]", chamber->GetNClusters(), AliTRDgeometry::GetDetector(ily, stk, sm), sm, stk, ily)); |
eb2b4f91 | 928 | continue; |
929 | } | |
930 | // build tracklet | |
4d8f1bd9 | 931 | tracklet.~AliTRDseedV1(); |
eb2b4f91 | 932 | ptrTracklet = new(&tracklet) AliTRDseedV1(det); |
4d6aee34 | 933 | ptrTracklet->SetReconstructor(fkReconstructor); |
eb2b4f91 | 934 | ptrTracklet->SetKink(t.IsKink()); |
2eb10c34 | 935 | ptrTracklet->SetPrimary(t.IsPrimary()); |
eb2b4f91 | 936 | ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk)); |
937 | ptrTracklet->SetX0(glb[0]+driftLength); | |
4d8f1bd9 | 938 | if(!ptrTracklet->Init(&t)){ |
4b5b4c5b | 939 | n= n?-n:-999; |
34b5e42d | 940 | t.SetErrStat(AliTRDtrackV1::kTrackletInit); |
1bd708e3 | 941 | AliDebug(4, "Failed Tracklet Init"); |
eb2b4f91 | 942 | break; |
943 | } | |
803dc399 | 944 | // Select attachment base on track to B field sign not only track charge which is buggy |
945 | // mark kFALSE same sign tracks and kTRUE opposite sign tracks | |
946 | // A.Bercuci 3.11.2011 | |
947 | Float_t prod(t.GetBz()*t.Charge()); | |
948 | if(!ptrTracklet->AttachClusters(chamber, kTRUE, prod<0.?kTRUE:kFALSE, fEventInFile)){ | |
34b5e42d | 949 | t.SetErrStat(AliTRDtrackV1::kNoAttach, ily); |
7c3eecb8 | 950 | if(debugLevel>3){ |
951 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
952 | UChar_t status(t.GetStatusTRD(ily)); | |
9dcc64cc | 953 | (*cstreamer) << "FollowBackProlongation4" |
7c3eecb8 | 954 | <<"status=" << status |
955 | <<"tracklet.=" << &trackletCp | |
956 | << "\n"; | |
957 | } | |
1bd708e3 | 958 | AliDebug(4, "Failed Attach Clusters"); |
eb2b4f91 | 959 | continue; |
960 | } | |
4b5b4c5b | 961 | Int_t nClTracklet(ptrTracklet->GetN()); |
962 | AliDebug(3, Form("Number of Clusters in Tracklet: %2d", nClTracklet)); | |
963 | if(nClTracklet < Int_t(fgNTimeBins*fkRecoParam->GetFindableClusters())){ | |
34b5e42d | 964 | t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily); |
7c3eecb8 | 965 | if(debugLevel>3){ |
966 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
967 | UChar_t status(t.GetStatusTRD(ily)); | |
9dcc64cc | 968 | (*cstreamer) << "FollowBackProlongation4" |
7c3eecb8 | 969 | <<"status=" << status |
970 | <<"tracklet.=" << &trackletCp | |
971 | << "\n"; | |
972 | } | |
4b5b4c5b | 973 | AliDebug(4, Form("Attached clusters %2d<%2d (%4.1f%% of TB[%2d])", nClTracklet, Int_t(fgNTimeBins*fkRecoParam->GetFindableClusters()), 1.e2*fkRecoParam->GetFindableClusters(), fgNTimeBins)); |
eb2b4f91 | 974 | continue; |
975 | } | |
976 | ptrTracklet->UpdateUsed(); | |
4b5b4c5b | 977 | // protect against reattaching clusters |
978 | if(Float_t(ptrTracklet->GetNUsed())/nClTracklet > .5/*fkRecoParam->GetUsedClustersLimit()*/){ | |
979 | t.SetErrStat(AliTRDtrackV1::kNoClustersTracklet, ily); | |
980 | AliDebug(4, Form("Used clusters %2d[%4.1f%%] exceed limit [%4.1f%%]", nClTracklet, Float_t(ptrTracklet->GetNUsed())/nClTracklet, 1.e2*.5/*fkRecoParam->GetUsedClustersLimit()*/)); | |
981 | continue; | |
982 | } | |
0217fcd0 | 983 | } else AliDebug(2, Form("Use external tracklet ly[%d]", ily)); |
eb2b4f91 | 984 | // propagate track to the radial position of the tracklet |
68f9b6bd | 985 | |
2eb10c34 | 986 | // fit tracklet |
987 | // tilt correction options | |
988 | // 0 : no correction | |
989 | // 2 : pseudo tilt correction | |
9dcc64cc | 990 | if(!ptrTracklet->FitRobust(t.Charge()>0?kTRUE:kFALSE)){ |
34b5e42d | 991 | t.SetErrStat(AliTRDtrackV1::kNoFit, ily); |
1bd708e3 | 992 | AliDebug(4, "Failed Tracklet Fit"); |
eb2b4f91 | 993 | continue; |
994 | } | |
995 | x = ptrTracklet->GetX(); //GetX0(); | |
952051c5 | 996 | if(x > (AliTRDReconstructor::GetMaxStep() + t.GetX()) && !PropagateToX(t, x, AliTRDReconstructor::GetMaxStep())) { |
4b5b4c5b | 997 | n= n?-n:-999; |
34b5e42d | 998 | t.SetErrStat(AliTRDtrackV1::kPropagation); |
1bd708e3 | 999 | AliDebug(4, Form("Failed Propagation to Tracklet x[%7.2f]", x)); |
eb2b4f91 | 1000 | break; |
1001 | } | |
1002 | if(!AdjustSector(&t)) { | |
4b5b4c5b | 1003 | n= n?-n:-999; |
34b5e42d | 1004 | t.SetErrStat(AliTRDtrackV1::kAdjustSector); |
1bd708e3 | 1005 | AliDebug(4, "Failed Adjust Sector"); |
eb2b4f91 | 1006 | break; |
41702fec | 1007 | } |
952051c5 | 1008 | if(TMath::Abs(t.GetSnp()) > AliTRDReconstructor::GetMaxSnp()) { |
4b5b4c5b | 1009 | n= n?-n:-999; |
34b5e42d | 1010 | t.SetErrStat(AliTRDtrackV1::kSnp); |
952051c5 | 1011 | AliDebug(4, Form("Failed Max Snp[%f] MaxSnp[%f]", t.GetSnp(), AliTRDReconstructor::GetMaxSnp())); |
eb2b4f91 | 1012 | break; |
1013 | } | |
4b5b4c5b | 1014 | // update parameters of track in. |
1015 | if(!ily) t.SetTrackIn(); | |
b72f4eaf | 1016 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
1017 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; | |
1018 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); | |
6e39bde4 | 1019 | // update Kalman with the TRD measurement |
b72f4eaf | 1020 | if(chi2>1e+10){ // TODO |
34b5e42d | 1021 | t.SetErrStat(AliTRDtrackV1::kChi2, ily); |
7c3eecb8 | 1022 | if(debugLevel > 2){ |
1023 | UChar_t status(t.GetStatusTRD()); | |
1024 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
1025 | AliTRDtrackV1 trackCp(t); | |
1026 | trackCp.SetOwner(); | |
9dcc64cc | 1027 | (*cstreamer) << "FollowBackProlongation3" |
7c3eecb8 | 1028 | << "status=" << status |
1029 | << "tracklet.=" << &trackletCp | |
1030 | << "track.=" << &trackCp | |
1031 | << "\n"; | |
1032 | } | |
1bd708e3 | 1033 | AliDebug(4, Form("Failed Chi2[%f]", chi2)); |
eb2b4f91 | 1034 | continue; |
1035 | } | |
ef867f55 | 1036 | if(kUseTRD){ |
1037 | if(!((AliExternalTrackParam&)t).Update(p, cov)) { | |
4b5b4c5b | 1038 | n= n?-n:-999; |
34b5e42d | 1039 | t.SetErrStat(AliTRDtrackV1::kUpdate); |
ef867f55 | 1040 | if(debugLevel > 2){ |
1041 | UChar_t status(t.GetStatusTRD()); | |
1042 | AliTRDseedV1 trackletCp(*ptrTracklet); | |
1043 | AliTRDtrackV1 trackCp(t); | |
1044 | trackCp.SetOwner(); | |
9dcc64cc | 1045 | (*cstreamer) << "FollowBackProlongation3" |
ef867f55 | 1046 | << "status=" << status |
1047 | << "tracklet.=" << &trackletCp | |
1048 | << "track.=" << &trackCp | |
1049 | << "\n"; | |
1050 | } | |
1051 | AliDebug(4, Form("Failed Track Update @ y[%7.2f] z[%7.2f] s2y[%f] s2z[%f] covyz[%f]", p[0], p[1], cov[0], cov[2], cov[1])); | |
1052 | break; | |
7c3eecb8 | 1053 | } |
eb2b4f91 | 1054 | } |
68f9b6bd | 1055 | if(!kStandAlone) ptrTracklet->UseClusters(); |
b72f4eaf | 1056 | // fill residuals ?! |
1057 | AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId()); | |
1058 | ||
eb2b4f91 | 1059 | |
4d8f1bd9 | 1060 | // register tracklet with the tracker and track |
803dc399 | 1061 | // Save inside the tracklet the track parameters BEFORE track update. |
1062 | // Commented out their overwriting AFTER track update | |
1063 | // A.Bercuci 3.11.2011 | |
1064 | //ptrTracklet->Update(&t); | |
eb2b4f91 | 1065 | ptrTracklet = SetTracklet(ptrTracklet); |
17896e82 | 1066 | Int_t index(fTracklets->GetEntriesFast()-1); |
1067 | t.SetTracklet(ptrTracklet, index); | |
ef867f55 | 1068 | // Register info to track |
1069 | t.SetNumberOfClusters(); | |
1070 | t.UpdateChi2(chi2); | |
1071 | ||
eb2b4f91 | 1072 | n += ptrTracklet->GetN(); |
17896e82 | 1073 | AliDebug(2, Form("Setting Tracklet[%d] @ Idx[%d]", ily, index)); |
eb2b4f91 | 1074 | |
41702fec | 1075 | // Reset material budget if 2 consecutive gold |
eb2b4f91 | 1076 | // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec | 1077 | |
1078 | // Make backup of the track until is gold | |
b453ef55 | 1079 | Int_t failed(0); |
68f9b6bd | 1080 | if(!kStandAlone && (failed = t.MakeBackupTrack())) AliDebug(2, Form("Failed backup on cut[%d]", failed)); |
9e85cb05 | 1081 | |
053767a4 | 1082 | } // end layers loop |
eb2b4f91 | 1083 | //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD()); |
1084 | //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n"); | |
41702fec | 1085 | |
9dcc64cc | 1086 | if(n && debugLevel > 1){ |
1087 | //Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
eb2b4f91 | 1088 | AliTRDtrackV1 track(t); |
1089 | track.SetOwner(); | |
9dcc64cc | 1090 | (*cstreamer) << "FollowBackProlongation2" |
1091 | << "EventNumber=" << fEventInFile | |
eb2b4f91 | 1092 | << "track.=" << &track |
41702fec | 1093 | << "\n"; |
1094 | } | |
1095 | ||
eb2b4f91 | 1096 | return n; |
0906e73e | 1097 | } |
1098 | ||
eb38ed55 | 1099 | //_________________________________________________________________________ |
4d6aee34 | 1100 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){ |
41702fec | 1101 | // |
1102 | // Fits a Riemann-circle to the given points without tilting pad correction. | |
1103 | // The fit is performed using an instance of the class AliRieman (equations | |
1104 | // and transformations see documentation of this class) | |
1105 | // Afterwards all the tracklets are Updated | |
1106 | // | |
1107 | // Parameters: - Array of tracklets (AliTRDseedV1) | |
1108 | // - Storage for the chi2 values (beginning with direction z) | |
1109 | // - Seeding configuration | |
1110 | // Output: - The curvature | |
1111 | // | |
1112 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
1113 | fitter->Reset(); | |
1114 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; | |
1115 | Int_t *ppl = &allplanes[0]; | |
1116 | Int_t maxLayers = 6; | |
1117 | if(planes){ | |
1118 | maxLayers = 4; | |
1119 | ppl = planes; | |
1120 | } | |
1121 | for(Int_t il = 0; il < maxLayers; il++){ | |
1122 | if(!tracklets[ppl[il]].IsOK()) continue; | |
e3cf3d02 | 1123 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10); |
41702fec | 1124 | } |
1125 | fitter->Update(); | |
1126 | // Set the reference position of the fit and calculate the chi2 values | |
1127 | memset(chi2, 0, sizeof(Double_t) * 2); | |
1128 | for(Int_t il = 0; il < maxLayers; il++){ | |
1129 | // Reference positions | |
1130 | tracklets[ppl[il]].Init(fitter); | |
1131 | ||
1132 | // chi2 | |
1133 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; | |
1134 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); | |
1135 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); | |
1136 | } | |
1137 | return fitter->GetC(); | |
eb38ed55 | 1138 | } |
1139 | ||
1140 | //_________________________________________________________________________ | |
1141 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) | |
1142 | { | |
41702fec | 1143 | // |
1144 | // Performs a Riemann helix fit using the seedclusters as spacepoints | |
1145 | // Afterwards the chi2 values are calculated and the seeds are updated | |
1146 | // | |
1147 | // Parameters: - The four seedclusters | |
1148 | // - The tracklet array (AliTRDseedV1) | |
1149 | // - The seeding configuration | |
1150 | // - Chi2 array | |
1151 | // | |
1152 | // debug level 2 | |
1153 | // | |
1154 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); | |
1155 | fitter->Reset(); | |
a3743898 | 1156 | for(Int_t i = 0; i < 4; i++){ |
a3743898 | 1157 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.); |
1158 | } | |
41702fec | 1159 | fitter->Update(); |
1160 | ||
1161 | ||
1162 | // Update the seed and calculated the chi2 value | |
1163 | chi2[0] = 0; chi2[1] = 0; | |
1164 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ | |
1165 | // chi2 | |
1166 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); | |
1167 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); | |
1168 | } | |
eb38ed55 | 1169 | } |
1170 | ||
1171 | ||
1172 | //_________________________________________________________________________ | |
1173 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) | |
1174 | { | |
41702fec | 1175 | // |
1176 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is | |
1177 | // assumed that the vertex position is set to 0. | |
1178 | // This method is very usefull for high-pt particles | |
1179 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 | |
1180 | // x0, y0: Center of the circle | |
1181 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) | |
1182 | // zc: center of the pad row | |
1183 | // Equation which has to be fitted (after transformation): | |
1184 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 | |
1185 | // Transformation: | |
1186 | // t = 1/(x^2 + y^2) | |
1187 | // u = 2 * x * t | |
1188 | // v = 2 * x * tan(phiT) * t | |
1189 | // Parameters in the equation: | |
1190 | // a = -1/y0, b = x0/y0, e = dz/dx | |
1191 | // | |
1192 | // The Curvature is calculated by the following equation: | |
1193 | // - curv = a/Sqrt(b^2 + 1) = 1/R | |
1194 | // Parameters: - the 6 tracklets | |
1195 | // - the Vertex constraint | |
1196 | // Output: - the Chi2 value of the track | |
1197 | // | |
1198 | // debug level 5 | |
1199 | // | |
1200 | ||
1201 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); | |
1202 | fitter->StoreData(kTRUE); | |
1203 | fitter->ClearPoints(); | |
4d6aee34 | 1204 | AliTRDcluster *cl = NULL; |
41702fec | 1205 | |
1206 | Float_t x, y, z, w, t, error, tilt; | |
1207 | Double_t uvt[2]; | |
1208 | Int_t nPoints = 0; | |
053767a4 | 1209 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
1210 | if(!tracklets[ilr].IsOK()) continue; | |
8d2bec9e | 1211 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
053767a4 | 1212 | if(!tracklets[ilr].IsUsable(itb)) continue; |
e7542a7e | 1213 | if(!(cl = tracklets[ilr].GetClusters(itb))) continue; |
1742f24c | 1214 | if(!cl->IsInChamber()) continue; |
41702fec | 1215 | x = cl->GetX(); |
1216 | y = cl->GetY(); | |
1217 | z = cl->GetZ(); | |
053767a4 | 1218 | tilt = tracklets[ilr].GetTilt(); |
41702fec | 1219 | // Transformation |
1220 | t = 1./(x * x + y * y); | |
1221 | uvt[0] = 2. * x * t; | |
1222 | uvt[1] = 2. * x * t * tilt ; | |
1223 | w = 2. * (y + tilt * (z - zVertex)) * t; | |
78b7d24c | 1224 | error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t; |
41702fec | 1225 | fitter->AddPoint(uvt, w, error); |
1226 | nPoints++; | |
1227 | } | |
1228 | } | |
e17f4785 | 1229 | fitter->Eval(); |
41702fec | 1230 | |
1231 | // Calculate curvature | |
1232 | Double_t a = fitter->GetParameter(0); | |
1233 | Double_t b = fitter->GetParameter(1); | |
1234 | Double_t curvature = a/TMath::Sqrt(b*b + 1); | |
1235 | ||
ce42378b | 1236 | Float_t chi2track = 0.0; |
1237 | if (nPoints > 0) { | |
1238 | chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1239 | } | |
41702fec | 1240 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) |
68f9b6bd | 1241 | tracklets[ip].SetC(curvature, 1); |
1242 | ||
1243 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRiemanConstraint: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature); | |
41702fec | 1244 | |
a2fbb6ec | 1245 | /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){ |
41702fec | 1246 | //Linear Model on z-direction |
1247 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack | |
1248 | Double_t slope = fitter->GetParameter(2); | |
1249 | Double_t zref = slope * xref; | |
1250 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); | |
1251 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
1252 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 1253 | TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec | 1254 | treeStreamer << "FitTiltedRiemanConstraint" |
1255 | << "EventNumber=" << eventNumber | |
1256 | << "CandidateNumber=" << candidateNumber | |
1257 | << "Curvature=" << curvature | |
1258 | << "Chi2Track=" << chi2track | |
1259 | << "Chi2Z=" << chi2Z | |
1260 | << "zref=" << zref | |
1261 | << "\n"; | |
3a039a31 | 1262 | }*/ |
41702fec | 1263 | return chi2track; |
eb38ed55 | 1264 | } |
1265 | ||
1266 | //_________________________________________________________________________ | |
1267 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) | |
1268 | { | |
41702fec | 1269 | // |
1270 | // Performs a Riemann fit taking tilting pad correction into account | |
1271 | // The equation of a Riemann circle, where the y position is substituted by the | |
1272 | // measured y-position taking pad tilting into account, has to be transformed | |
1273 | // into a 4-dimensional hyperplane equation | |
1274 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 | |
1275 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) | |
1276 | // zc: center of the pad row | |
1277 | // zt: z-position of the track | |
1278 | // The z-position of the track is assumed to be linear dependent on the x-position | |
1279 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 | |
1280 | // Transformation: u = 2 * x * t | |
1281 | // v = 2 * tan(phiT) * t | |
1282 | // w = 2 * tan(phiT) * (x - xref) * t | |
1283 | // t = 1 / (x^2 + ymeas^2) | |
1284 | // Parameters: a = -1/y0 | |
1285 | // b = x0/y0 | |
1286 | // c = (R^2 -x0^2 - y0^2)/y0 | |
1287 | // d = offset | |
1288 | // e = dz/dx | |
1289 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using | |
1290 | // results from the simple riemann fit. Afterwards the fit is redone. | |
1291 | // The curvature is calculated according to the formula: | |
1292 | // curv = a/(1 + b^2 + c*a) = 1/R | |
1293 | // | |
1294 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1295 | // - Flag selecting the error definition | |
1296 | // Output: - Chi2 values of the track (in Parameter list) | |
1297 | // | |
1298 | TLinearFitter *fitter = GetTiltedRiemanFitter(); | |
1299 | fitter->StoreData(kTRUE); | |
1300 | fitter->ClearPoints(); | |
1301 | AliTRDLeastSquare zfitter; | |
4d6aee34 | 1302 | AliTRDcluster *cl = NULL; |
41702fec | 1303 | |
1304 | Double_t xref = CalculateReferenceX(tracklets); | |
6e39bde4 | 1305 | Double_t x, y, z, t, tilt, dx, w, we, erry, errz; |
1306 | Double_t uvt[4], sumPolY[5], sumPolZ[3]; | |
1307 | memset(sumPolY, 0, sizeof(Double_t) * 5); | |
1308 | memset(sumPolZ, 0, sizeof(Double_t) * 3); | |
41702fec | 1309 | Int_t nPoints = 0; |
1310 | // Containers for Least-square fitter | |
1311 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1312 | if(!tracklets[ipl].IsOK()) continue; | |
ed15ef4f | 1313 | tilt = tracklets[ipl].GetTilt(); |
8d2bec9e | 1314 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec | 1315 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1742f24c | 1316 | if(!cl->IsInChamber()) continue; |
c79857d5 | 1317 | if (!tracklets[ipl].IsUsable(itb)) continue; |
41702fec | 1318 | x = cl->GetX(); |
1319 | y = cl->GetY(); | |
1320 | z = cl->GetZ(); | |
41702fec | 1321 | dx = x - xref; |
1322 | // Transformation | |
1323 | t = 1./(x*x + y*y); | |
1324 | uvt[0] = 2. * x * t; | |
1325 | uvt[1] = t; | |
1326 | uvt[2] = 2. * tilt * t; | |
1327 | uvt[3] = 2. * tilt * dx * t; | |
1328 | w = 2. * (y + tilt*z) * t; | |
1329 | // error definition changes for the different calls | |
1330 | we = 2. * t; | |
78b7d24c | 1331 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2; |
41702fec | 1332 | fitter->AddPoint(uvt, w, we); |
1333 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
6e39bde4 | 1334 | // adding points for covariance matrix estimation |
1335 | erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration) | |
1336 | erry *= erry; | |
1337 | errz = 1./cl->GetSigmaZ2(); | |
1338 | for(Int_t ipol = 0; ipol < 5; ipol++){ | |
1339 | sumPolY[ipol] += erry; | |
1340 | erry *= x; | |
1341 | if(ipol < 3){ | |
1342 | sumPolZ[ipol] += errz; | |
1343 | errz *= x; | |
1344 | } | |
1345 | } | |
41702fec | 1346 | nPoints++; |
1347 | } | |
1348 | } | |
c08b1cc7 | 1349 | if (fitter->Eval()) return 1.e10; |
41702fec | 1350 | zfitter.Eval(); |
1351 | ||
1352 | Double_t offset = fitter->GetParameter(3); | |
1353 | Double_t slope = fitter->GetParameter(4); | |
1354 | ||
1355 | // Linear fitter - not possible to make boundaries | |
1356 | // Do not accept non possible z and dzdx combinations | |
1357 | Bool_t acceptablez = kTRUE; | |
1358 | Double_t zref = 0.0; | |
1359 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1360 | if(!tracklets[iLayer].IsOK()) continue; | |
1361 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1362 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
41702fec | 1363 | acceptablez = kFALSE; |
1364 | } | |
1365 | if (!acceptablez) { | |
1366 | Double_t dzmf = zfitter.GetFunctionParameter(1); | |
1367 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1368 | fgTiltedRieman->FixParameter(3, zmf); | |
1369 | fgTiltedRieman->FixParameter(4, dzmf); | |
e17f4785 | 1370 | fitter->Eval(); |
41702fec | 1371 | fitter->ReleaseParameter(3); |
1372 | fitter->ReleaseParameter(4); | |
1373 | offset = fitter->GetParameter(3); | |
1374 | slope = fitter->GetParameter(4); | |
1375 | } | |
1376 | ||
1377 | // Calculate Curvarture | |
1378 | Double_t a = fitter->GetParameter(0); | |
1379 | Double_t b = fitter->GetParameter(1); | |
1380 | Double_t c = fitter->GetParameter(2); | |
1381 | Double_t curvature = 1.0 + b*b - c*a; | |
68f9b6bd | 1382 | if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature); |
41702fec | 1383 | |
1384 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); | |
1385 | ||
6e39bde4 | 1386 | // Prepare error calculation |
1387 | TMatrixD covarPolY(3,3); | |
1388 | covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4]; | |
1389 | covarPolY(0,1) = covarPolY(1,0) = sumPolY[1]; | |
1390 | covarPolY(0,2) = covarPolY(2,0) = sumPolY[2]; | |
1391 | covarPolY(2,1) = covarPolY(1,2) = sumPolY[3]; | |
1392 | covarPolY.Invert(); | |
1393 | TMatrixD covarPolZ(2,2); | |
1394 | covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2]; | |
1395 | covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1]; | |
1396 | covarPolZ.Invert(); | |
1397 | ||
41702fec | 1398 | // Update the tracklets |
6e39bde4 | 1399 | Double_t x1, dy, dz; |
1400 | Double_t cov[15]; | |
1401 | memset(cov, 0, sizeof(Double_t) * 15); | |
41702fec | 1402 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { |
1403 | ||
1404 | x = tracklets[iLayer].GetX0(); | |
6e39bde4 | 1405 | x1 = x - xref; |
41702fec | 1406 | y = 0; |
1407 | z = 0; | |
1408 | dy = 0; | |
1409 | dz = 0; | |
6e39bde4 | 1410 | memset(cov, 0, sizeof(Double_t) * 3); |
1411 | TMatrixD transform(3,3); | |
1412 | transform(0,0) = 1; | |
1413 | transform(0,1) = x; | |
1414 | transform(0,2) = x*x; | |
1415 | transform(1,1) = 1; | |
1416 | transform(1,2) = x; | |
1417 | transform(2,2) = 1; | |
1418 | TMatrixD covariance(transform, TMatrixD::kMult, covarPolY); | |
1419 | covariance *= transform.T(); | |
1420 | TMatrixD transformZ(2,2); | |
1421 | transformZ(0,0) = transformZ(1,1) = 1; | |
1422 | transformZ(0,1) = x; | |
1423 | TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ); | |
1424 | covarZ *= transformZ.T(); | |
41702fec | 1425 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1426 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1427 | // R = Sqrt() = 1/Curvature | |
1428 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
1429 | Double_t res = (x * a + b); // = (x - x0)/y0 | |
1430 | res *= res; | |
1431 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 | |
1432 | if (res >= 0) { | |
1433 | res = TMath::Sqrt(res); | |
1434 | y = (1.0 - res) / a; | |
1435 | } | |
6e39bde4 | 1436 | cov[0] = covariance(0,0); |
1437 | cov[2] = covarZ(0,0); | |
1438 | cov[1] = 0.; | |
41702fec | 1439 | |
1440 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
1441 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
1442 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1443 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
1444 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
1445 | Double_t x0 = -b / a; | |
1446 | if (-c * a + b * b + 1 > 0) { | |
1447 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
6e39bde4 | 1448 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); |
1449 | if (a < 0) yderiv *= -1.0; | |
1450 | dy = yderiv; | |
41702fec | 1451 | } |
1452 | } | |
1453 | z = offset + slope * (x - xref); | |
1454 | dz = slope; | |
1455 | tracklets[iLayer].SetYref(0, y); | |
1456 | tracklets[iLayer].SetYref(1, dy); | |
1457 | tracklets[iLayer].SetZref(0, z); | |
1458 | tracklets[iLayer].SetZref(1, dz); | |
1459 | tracklets[iLayer].SetC(curvature); | |
6e39bde4 | 1460 | tracklets[iLayer].SetCovRef(cov); |
41702fec | 1461 | tracklets[iLayer].SetChi2(chi2track); |
1462 | } | |
68f9b6bd | 1463 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitTiltedRieman: Chi2[%f] C[%5.2e] pt[%8.3f]\n", chi2track, curvature, GetBz()*kB2C/curvature); |
41702fec | 1464 | |
a2fbb6ec | 1465 | /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){ |
1466 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); | |
41702fec | 1467 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1468 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
1469 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); | |
1470 | cstreamer << "FitTiltedRieman0" | |
1471 | << "EventNumber=" << eventNumber | |
1472 | << "CandidateNumber=" << candidateNumber | |
1473 | << "xref=" << xref | |
1474 | << "Chi2Z=" << chi2z | |
1475 | << "\n"; | |
3a039a31 | 1476 | }*/ |
41702fec | 1477 | return chi2track; |
eb38ed55 | 1478 | } |
1479 | ||
3b57a3f7 | 1480 | |
9e333711 | 1481 | //____________________________________________________________________ |
6e4d4425 | 1482 | Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
9e333711 | 1483 | { |
4d6aee34 | 1484 | // |
1485 | // Fit track with a staight line | |
1486 | // Fills an AliTrackPoint array with np points | |
1487 | // Function should be used to refit tracks when no magnetic field was on | |
1488 | // | |
9e333711 | 1489 | AliTRDLeastSquare yfitter, zfitter; |
4d6aee34 | 1490 | AliTRDcluster *cl = NULL; |
9e333711 | 1491 | |
4d6aee34 | 1492 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
9e333711 | 1493 | if(!tracklets){ |
1494 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1495 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1496 | if(!tracklet->IsOK()) continue; | |
1497 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1498 | } | |
1499 | tracklets = &work[0]; | |
1500 | } | |
1501 | ||
1502 | Double_t xref = CalculateReferenceX(tracklets); | |
1503 | Double_t x, y, z, dx, ye, yr, tilt; | |
1504 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1505 | if(!tracklets[ipl].IsOK()) continue; | |
1506 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1507 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1508 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1509 | x = cl->GetX(); | |
1510 | z = cl->GetZ(); | |
1511 | dx = x - xref; | |
1512 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1513 | } | |
1514 | } | |
1515 | zfitter.Eval(); | |
1516 | Double_t z0 = zfitter.GetFunctionParameter(0); | |
1517 | Double_t dzdx = zfitter.GetFunctionParameter(1); | |
1518 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1519 | if(!tracklets[ipl].IsOK()) continue; | |
1520 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ | |
1521 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; | |
1522 | if (!tracklets[ipl].IsUsable(itb)) continue; | |
1523 | x = cl->GetX(); | |
1524 | y = cl->GetY(); | |
1525 | z = cl->GetZ(); | |
1526 | tilt = tracklets[ipl].GetTilt(); | |
1527 | dx = x - xref; | |
1528 | yr = y + tilt*(z - z0 - dzdx*dx); | |
1529 | // error definition changes for the different calls | |
1530 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); | |
1531 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; | |
1532 | yfitter.AddPoint(&dx, yr, ye); | |
1533 | } | |
1534 | } | |
1535 | yfitter.Eval(); | |
1536 | Double_t y0 = yfitter.GetFunctionParameter(0); | |
1537 | Double_t dydx = yfitter.GetFunctionParameter(1); | |
1538 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); | |
1539 | ||
1540 | //update track points array | |
1541 | if(np && points){ | |
1542 | Float_t xyz[3]; | |
1543 | for(int ip=0; ip<np; ip++){ | |
1544 | points[ip].GetXYZ(xyz); | |
1545 | xyz[1] = y0 + dydx * (xyz[0] - xref); | |
1546 | xyz[2] = z0 + dzdx * (xyz[0] - xref); | |
1547 | points[ip].SetXYZ(xyz); | |
1548 | } | |
1549 | } | |
1550 | return chi2; | |
1551 | } | |
1552 | ||
1553 | ||
3b57a3f7 | 1554 | //_________________________________________________________________________ |
6e4d4425 | 1555 | Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
3b57a3f7 | 1556 | { |
0fa1a8ee | 1557 | // |
1558 | // Performs a Riemann fit taking tilting pad correction into account | |
1559 | // | |
1560 | // Paramters: - Array of tracklets (connected to the track candidate) | |
1561 | // - Flag selecting the error definition | |
1562 | // Output: - Chi2 values of the track (in Parameter list) | |
1563 | // | |
1564 | // The equations which has to be solved simultaneously are: | |
1565 | // BEGIN_LATEX | |
1566 | // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2} | |
1567 | // y^{*} = y - tg(h)(z - z_{t}) | |
1568 | // z_{t} = z_{0}+dzdx*(x-x_{r}) | |
1569 | // END_LATEX | |
1570 | // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle, | |
1571 | // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the | |
1572 | // track in the x-z plane. Using the following transformations | |
1573 | // BEGIN_LATEX | |
1574 | // t = 1 / (x^{2} + y^{2}) | |
1575 | // u = 2 * x * t | |
1576 | // v = 2 * tan(h) * t | |
1577 | // w = 2 * tan(h) * (x - x_{r}) * t | |
1578 | // END_LATEX | |
1579 | // One gets the following linear equation | |
1580 | // BEGIN_LATEX | |
1581 | // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t | |
1582 | // END_LATEX | |
1583 | // where the coefficients have the following meaning | |
1584 | // BEGIN_LATEX | |
1585 | // a = -1/y_{0} | |
1586 | // b = x_{0}/y_{0} | |
1587 | // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0} | |
1588 | // d = z_{0} | |
1589 | // e = dz/dx | |
1590 | // END_LATEX | |
1591 | // The error calculation for the free term is thus | |
1592 | // BEGIN_LATEX | |
1593 | // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t | |
1594 | // END_LATEX | |
1595 | // | |
1596 | // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according | |
1597 | // to the formula: | |
1598 | // BEGIN_LATEX | |
1599 | // C = 1/R = a/(1 + b^{2} + c*a) | |
1600 | // END_LATEX | |
1601 | // | |
1602 | // Authors | |
1603 | // M.Ivanov <M.Ivanov@gsi.de> | |
1604 | // A.Bercuci <A.Bercuci@gsi.de> | |
1605 | // M.Fasel <M.Fasel@gsi.de> | |
1606 | ||
41702fec | 1607 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1608 | fitter->StoreData(kTRUE); | |
1609 | fitter->ClearPoints(); | |
1610 | AliTRDLeastSquare zfitter; | |
4d6aee34 | 1611 | AliTRDcluster *cl = NULL; |
3b57a3f7 | 1612 | |
4d6aee34 | 1613 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
3b57a3f7 | 1614 | if(!tracklets){ |
1615 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1616 | if(!(tracklet = track->GetTracklet(ipl))) continue; | |
1617 | if(!tracklet->IsOK()) continue; | |
1618 | new(&work[ipl]) AliTRDseedV1(*tracklet); | |
1619 | } | |
1620 | tracklets = &work[0]; | |
1621 | } | |
1622 | ||
41702fec | 1623 | Double_t xref = CalculateReferenceX(tracklets); |
68f9b6bd | 1624 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:\nx0[(0)%6.2f (1)%6.2f (2)%6.2f (3)%6.2f (4)%6.2f (5)%6.2f] xref[%6.2f]", tracklets[0].GetX0(), tracklets[1].GetX0(), tracklets[2].GetX0(), tracklets[3].GetX0(), tracklets[4].GetX0(), tracklets[5].GetX0(), xref); |
41702fec | 1625 | Double_t x, y, z, t, tilt, dx, w, we; |
1626 | Double_t uvt[4]; | |
1627 | Int_t nPoints = 0; | |
1628 | // Containers for Least-square fitter | |
1629 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ | |
1630 | if(!tracklets[ipl].IsOK()) continue; | |
8d2bec9e | 1631 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec | 1632 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
352cef8f | 1633 | //if (!tracklets[ipl].IsUsable(itb)) continue; |
41702fec | 1634 | x = cl->GetX(); |
1635 | y = cl->GetY(); | |
1636 | z = cl->GetZ(); | |
1637 | tilt = tracklets[ipl].GetTilt(); | |
1638 | dx = x - xref; | |
1639 | // Transformation | |
1640 | t = 1./(x*x + y*y); | |
1641 | uvt[0] = 2. * x * t; | |
1642 | uvt[1] = t; | |
1643 | uvt[2] = 2. * tilt * t; | |
1644 | uvt[3] = 2. * tilt * dx * t; | |
1645 | w = 2. * (y + tilt*z) * t; | |
1646 | // error definition changes for the different calls | |
1647 | we = 2. * t; | |
f29f13a6 | 1648 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec | 1649 | fitter->AddPoint(uvt, w, we); |
1650 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
1651 | nPoints++; | |
1652 | } | |
1653 | } | |
aec26713 | 1654 | if(fitter->Eval()) return 1.E10; |
1655 | ||
41702fec | 1656 | Double_t z0 = fitter->GetParameter(3); |
1657 | Double_t dzdx = fitter->GetParameter(4); | |
3b57a3f7 | 1658 | |
1659 | ||
1660 | // Linear fitter - not possible to make boundaries | |
1661 | // Do not accept non possible z and dzdx combinations | |
1662 | Bool_t accept = kTRUE; | |
1663 | Double_t zref = 0.0; | |
1664 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
1665 | if(!tracklets[iLayer].IsOK()) continue; | |
1666 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1667 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
3b57a3f7 | 1668 | accept = kFALSE; |
1669 | } | |
1670 | if (!accept) { | |
41702fec | 1671 | zfitter.Eval(); |
3b57a3f7 | 1672 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1673 | Double_t zmf = zfitter.GetFunctionValue(&xref); | |
1674 | fitter->FixParameter(3, zmf); | |
1675 | fitter->FixParameter(4, dzmf); | |
e17f4785 | 1676 | fitter->Eval(); |
3b57a3f7 | 1677 | fitter->ReleaseParameter(3); |
1678 | fitter->ReleaseParameter(4); | |
1679 | z0 = fitter->GetParameter(3); // = zmf ? | |
1680 | dzdx = fitter->GetParameter(4); // = dzmf ? | |
1681 | } | |
1682 | ||
1683 | // Calculate Curvature | |
1684 | Double_t a = fitter->GetParameter(0); | |
1685 | Double_t b = fitter->GetParameter(1); | |
1686 | Double_t c = fitter->GetParameter(2); | |
1687 | Double_t y0 = 1. / a; | |
1688 | Double_t x0 = -b * y0; | |
a015e406 | 1689 | Double_t tmp = y0*y0 + x0*x0 - c*y0; |
1690 | if(tmp<=0.) return 1.E10; | |
4d6aee34 | 1691 | Double_t radius = TMath::Sqrt(tmp); |
1692 | Double_t curvature = 1.0 + b*b - c*a; | |
1693 | if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature); | |
3b57a3f7 | 1694 | |
1695 | // Calculate chi2 of the fit | |
1696 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); | |
68f9b6bd | 1697 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>3) printf("D-AliTRDtrackerV1::FitRiemanTilt:x0[%6.2f] y0[%6.2f] R[%6.2f] chi2[%f]\n", x0, y0, radius, chi2); |
3b57a3f7 | 1698 | |
1699 | // Update the tracklets | |
1700 | if(!track){ | |
1701 | for(Int_t ip = 0; ip < kNPlanes; ip++) { | |
1702 | x = tracklets[ip].GetX0(); | |
4d6aee34 | 1703 | tmp = radius*radius-(x-x0)*(x-x0); |
a015e406 | 1704 | if(tmp <= 0.) continue; |
1705 | tmp = TMath::Sqrt(tmp); | |
3b57a3f7 | 1706 | |
1707 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
1708 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
1709 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); | |
1710 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
1711 | tracklets[ip].SetYref(1, (x - x0) / tmp); | |
1712 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); | |
1713 | tracklets[ip].SetZref(1, dzdx); | |
4d6aee34 | 1714 | tracklets[ip].SetC(curvature); |
3b57a3f7 | 1715 | tracklets[ip].SetChi2(chi2); |
1716 | } | |
1717 | } | |
3b57a3f7 | 1718 | //update track points array |
1719 | if(np && points){ | |
1720 | Float_t xyz[3]; | |
1721 | for(int ip=0; ip<np; ip++){ | |
1722 | points[ip].GetXYZ(xyz); | |
4d6aee34 | 1723 | 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 | 1724 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1725 | points[ip].SetXYZ(xyz); | |
1726 | } | |
1727 | } | |
1728 | ||
3b57a3f7 | 1729 | return chi2; |
1730 | } | |
1731 | ||
1732 | ||
1bf51039 | 1733 | //____________________________________________________________________ |
e17f4785 | 1734 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points) |
1bf51039 | 1735 | { |
1736 | // Kalman filter implementation for the TRD. | |
1737 | // It returns the positions of the fit in the array "points" | |
1738 | // | |
1739 | // Author : A.Bercuci@gsi.de | |
1740 | ||
3cfaffa4 | 1741 | // printf("Start track @ x[%f]\n", track->GetX()); |
1bf51039 | 1742 | |
1743 | //prepare marker points along the track | |
1744 | Int_t ip = np ? 0 : 1; | |
1745 | while(ip<np){ | |
1746 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; | |
1747 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); | |
1748 | ip++; | |
1749 | } | |
1750 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); | |
1751 | ||
1752 | ||
d8069611 | 1753 | AliTRDseedV1 tracklet; |
1754 | AliTRDseedV1 *ptrTracklet = NULL; | |
1bf51039 | 1755 | |
1756 | //Loop through the TRD planes | |
1757 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { | |
1758 | // GET TRACKLET OR BUILT IT | |
1759 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; | |
1760 | if(tracklets){ | |
e17f4785 | 1761 | if(!(ptrTracklet = &tracklets[iplane])) continue; |
1bf51039 | 1762 | }else{ |
1763 | if(!(ptrTracklet = track->GetTracklet(iplane))){ | |
4d6aee34 | 1764 | /*AliTRDtrackerV1 *tracker = NULL; |
a2fbb6ec | 1765 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue; |
1bf51039 | 1766 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); |
1767 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ | |
1768 | continue; | |
1769 | } | |
1770 | } | |
1771 | if(!ptrTracklet->IsOK()) continue; | |
1772 | ||
1773 | Double_t x = ptrTracklet->GetX0(); | |
1774 | ||
1775 | while(ip < np){ | |
1776 | //don't do anything if next marker is after next update point. | |
952051c5 | 1777 | if((up?-1:1) * (points[ip].GetX() - x) - AliTRDReconstructor::GetMaxStep() < 0) break; |
1778 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.; | |
1bf51039 | 1779 | |
1780 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1781 | track->GetXYZ(xyz); |
1782 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1783 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1784 | ip++; |
1785 | } | |
3cfaffa4 | 1786 | // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1bf51039 | 1787 | |
3cfaffa4 | 1788 | // Propagate closer to the next update point |
952051c5 | 1789 | if(((up?-1:1) * (x - track->GetX()) + AliTRDReconstructor::GetMaxStep() < 0) && !PropagateToX(*track, x + (up?-1:1)*AliTRDReconstructor::GetMaxStep(), AliTRDReconstructor::GetMaxStep())) return -1.; |
1bf51039 | 1790 | |
1791 | if(!AdjustSector(track)) return -1; | |
952051c5 | 1792 | if(TMath::Abs(track->GetSnp()) > AliTRDReconstructor::GetMaxSnp()) return -1; |
1bf51039 | 1793 | |
1794 | //load tracklet to the tracker and the track | |
1795 | /* Int_t index; | |
1796 | if((index = FindTracklet(ptrTracklet)) < 0){ | |
1797 | ptrTracklet = SetTracklet(&tracklet); | |
1798 | index = fTracklets->GetEntriesFast()-1; | |
1799 | } | |
1800 | track->SetTracklet(ptrTracklet, index);*/ | |
1801 | ||
1802 | ||
1803 | // register tracklet to track with tracklet creation !! | |
1804 | // PropagateBack : loaded tracklet to the tracker and update index | |
1805 | // RefitInward : update index | |
1806 | // MakeTrack : loaded tracklet to the tracker and update index | |
1807 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); | |
1808 | ||
1809 | ||
1810 | //Calculate the mean material budget along the path inside the chamber | |
1811 | Double_t xyz0[3]; track->GetXYZ(xyz0); | |
1812 | Double_t alpha = track->GetAlpha(); | |
1813 | Double_t xyz1[3], y, z; | |
1814 | if(!track->GetProlongation(x, y, z)) return -1; | |
1815 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); | |
1816 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); | |
1817 | xyz1[2] = z; | |
fbe11be7 | 1818 | if(TMath::Abs(xyz0[0] - xyz1[0]) < 1e-3 && TMath::Abs(xyz0[1] - xyz1[1]) < 1e-3) continue; // check wheter we are at the same global x position |
1bf51039 | 1819 | Double_t param[7]; |
3cfaffa4 | 1820 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break; |
1bf51039 | 1821 | Double_t xrho = param[0]*param[4]; // density*length |
1822 | Double_t xx0 = param[1]; // radiation length | |
1823 | ||
1824 | //Propagate the track | |
1825 | track->PropagateTo(x, xx0, xrho); | |
1826 | if (!AdjustSector(track)) break; | |
1827 | ||
1828 | //Update track | |
b72f4eaf | 1829 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
1830 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; | |
1831 | Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov); | |
ef867f55 | 1832 | if(chi2<1e+10) ((AliExternalTrackParam*)track)->Update(p, cov); |
1bf51039 | 1833 | if(!up) continue; |
1834 | ||
1835 | //Reset material budget if 2 consecutive gold | |
1836 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); | |
1837 | } // end planes loop | |
1838 | ||
1839 | // extrapolation | |
1840 | while(ip < np){ | |
952051c5 | 1841 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), AliTRDReconstructor::GetMaxStep())) return -1.; |
1bf51039 | 1842 | |
1843 | Double_t xyz[3]; // should also get the covariance | |
3cfaffa4 | 1844 | track->GetXYZ(xyz); |
1845 | track->Global2LocalPosition(xyz, track->GetAlpha()); | |
1846 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); | |
1bf51039 | 1847 | ip++; |
1848 | } | |
1849 | ||
1850 | return track->GetChi2(); | |
1851 | } | |
3b57a3f7 | 1852 | |
eb38ed55 | 1853 | //_________________________________________________________________________ |
d8069611 | 1854 | Float_t AliTRDtrackerV1::CalculateChi2Z(const AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 | 1855 | { |
41702fec | 1856 | // |
1857 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. | |
1858 | // A linear dependence on the x-value serves as a model. | |
1859 | // The parameters are related to the tilted Riemann fit. | |
1860 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
1861 | // - the offset for the reference x | |
1862 | // - the slope | |
1863 | // - the reference x position | |
1864 | // Output: - The Chi2 value of the track in z-Direction | |
1865 | // | |
1866 | Float_t chi2Z = 0, nLayers = 0; | |
053767a4 | 1867 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec | 1868 | if(!tracklets[iLayer].IsOK()) continue; |
1869 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); | |
e3cf3d02 | 1870 | chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z); |
41702fec | 1871 | nLayers++; |
1872 | } | |
1873 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); | |
1874 | return chi2Z; | |
eb38ed55 | 1875 | } |
1876 | ||
bccda319 | 1877 | //_____________________________________________________________________________ |
1878 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) | |
1879 | { | |
41702fec | 1880 | // |
1881 | // Starting from current X-position of track <t> this function | |
1882 | // extrapolates the track up to radial position <xToGo>. | |
1883 | // Returns 1 if track reaches the plane, and 0 otherwise | |
1884 | // | |
bccda319 | 1885 | |
41702fec | 1886 | // Current track X-position |
15a2657d | 1887 | Double_t xpos = t.GetX()/*, |
1888 | mass = t.GetMass()*/; | |
bccda319 | 1889 | |
41702fec | 1890 | // Direction: inward or outward |
1891 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; | |
bccda319 | 1892 | |
952051c5 | 1893 | while (((xToGo - xpos) * dir) > AliTRDReconstructor::GetEpsilon()) { |
2f4384e6 | 1894 | // printf("to go %f\n", (xToGo - xpos) * dir); |
41702fec | 1895 | Double_t xyz0[3]; |
1896 | Double_t xyz1[3]; | |
1897 | Double_t param[7]; | |
1898 | Double_t x; | |
1899 | Double_t y; | |
1900 | Double_t z; | |
bccda319 | 1901 | |
41702fec | 1902 | // The next step size |
1903 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); | |
bccda319 | 1904 | |
41702fec | 1905 | // Get the global position of the starting point |
1906 | t.GetXYZ(xyz0); | |
bccda319 | 1907 | |
41702fec | 1908 | // X-position after next step |
1909 | x = xpos + step; | |
bccda319 | 1910 | |
41702fec | 1911 | // Get local Y and Z at the X-position of the next step |
3352b455 | 1912 | if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible |
bccda319 | 1913 | |
41702fec | 1914 | // The global position of the end point of this prolongation step |
1915 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); | |
1916 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); | |
1917 | xyz1[2] = z; | |
bccda319 | 1918 | |
41702fec | 1919 | // Calculate the mean material budget between start and |
1920 | // end point of this prolongation step | |
83dea92e | 1921 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0; |
2f4384e6 | 1922 | |
41702fec | 1923 | // Propagate the track to the X-position after the next step |
9c87a076 | 1924 | if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0; |
bccda319 | 1925 | |
15a2657d | 1926 | /* // Correct for mean material budget |
2f4384e6 | 1927 | Double_t dEdx(0.), |
1928 | bg(t.GetP()/mass); | |
1929 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3){ | |
1930 | const char *pn[] = {"rho", "x/X0", "<A>", "<Z>", "L", "<Z/A>", "Nb"}; | |
1931 | printf("D-AliTRDtrackerV1::PropagateTo(): x[%6.2f] bg[%6.2f]\n", xpos, bg); | |
1932 | printf(" param :: %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e] %s[%e]\n" | |
1933 | , pn[0], param[0] | |
1934 | , pn[1], param[1] | |
1935 | , pn[2], param[2] | |
1936 | , pn[3], param[3] | |
1937 | , pn[4], param[4] | |
1938 | , pn[5], param[5] | |
1939 | , pn[6], param[6]); | |
1940 | } | |
1941 | switch(fgBB){ | |
1942 | case kSolid: | |
1943 | dEdx = AliExternalTrackParam::BetheBlochSolid(bg); | |
1944 | break; | |
1945 | case kGas: | |
1946 | dEdx = AliExternalTrackParam::BetheBlochGas(bg); | |
1947 | break; | |
1948 | case kGeant: | |
1949 | { // mean exitation energy (GeV) | |
1950 | Double_t mee = ((param[3] < 13.) ? (12. * param[3] + 7.) : (9.76 * param[3] + 58.8 * TMath::Power(param[3],-0.19))) * 1.e-9; | |
1951 | Double_t mZA = param[5]>1.e-5?param[5]:(param[3]/param[2]); | |
1952 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=3) printf("D-AliTRDtrackerV1::PropagateTo(): Mee[%e] <Z/A>[%e]\n", mee, mZA); | |
1953 | // protect against failed calculation of rho in MeanMaterialBudget() | |
1954 | dEdx = AliExternalTrackParam::BetheBlochGeant(bg, param[0]>1.e-6?param[0]:2.33, 0.2, 3., mee, mZA); | |
1955 | } | |
1956 | break; | |
1957 | } | |
1958 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")>=2) printf("D-AliTRDtrackerV1::PropagateTo(): dEdx(bg=%e, m=%e)= %e[GeV/cm]\n", bg, mass, dEdx); | |
1959 | if (!t.CorrectForMeanMaterialdEdx(param[1], dir*param[0]*param[4], mass, dEdx)) return 0; | |
15a2657d | 1960 | */ |
41702fec | 1961 | // Rotate the track if necessary |
e7542a7e | 1962 | if(!AdjustSector(&t)) return 0; |
bccda319 | 1963 | |
41702fec | 1964 | // New track X-position |
1965 | xpos = t.GetX(); | |
bccda319 | 1966 | |
41702fec | 1967 | } |
bccda319 | 1968 | |
41702fec | 1969 | return 1; |
bccda319 | 1970 | |
1971 | } | |
1972 | ||
eb38ed55 | 1973 | //_____________________________________________________________________________ |
e7542a7e | 1974 | Bool_t AliTRDtrackerV1::ReadClusters(TTree *clusterTree) |
eb38ed55 | 1975 | { |
41702fec | 1976 | // |
1977 | // Reads AliTRDclusters from the file. | |
1978 | // The names of the cluster tree and branches | |
1979 | // should match the ones used in AliTRDclusterizer::WriteClusters() | |
1980 | // | |
1981 | ||
1982 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); | |
1983 | TObjArray *clusterArray = new TObjArray(nsize+1000); | |
1984 | ||
1985 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); | |
1986 | if (!branch) { | |
1987 | AliError("Can't get the branch !"); | |
e7542a7e | 1988 | return kFALSE; |
41702fec | 1989 | } |
1990 | branch->SetAddress(&clusterArray); | |
1991 | ||
1992 | if(!fClusters){ | |
9e85cb05 | 1993 | Float_t nclusters = fkRecoParam->GetNClusters(); |
4d6aee34 | 1994 | if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector; |
e7542a7e | 1995 | fClusters = new TClonesArray("AliTRDcluster", Int_t(nclusters)); |
1996 | fClusters->SetOwner(kTRUE); | |
41702fec | 1997 | } |
1998 | ||
1999 | // Loop through all entries in the tree | |
2000 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); | |
2001 | Int_t nbytes = 0; | |
2002 | Int_t ncl = 0; | |
4d6aee34 | 2003 | AliTRDcluster *c = NULL; |
41702fec | 2004 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { |
2005 | // Import the tree | |
2006 | nbytes += clusterTree->GetEvent(iEntry); | |
2007 | ||
2008 | // Get the number of points in the detector | |
2009 | Int_t nCluster = clusterArray->GetEntriesFast(); | |
2010 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { | |
2011 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; | |
41702fec | 2012 | new((*fClusters)[ncl++]) AliTRDcluster(*c); |
2013 | delete (clusterArray->RemoveAt(iCluster)); | |
2014 | } | |
41702fec | 2015 | } |
2016 | delete clusterArray; | |
2017 | ||
e7542a7e | 2018 | return kTRUE; |
eb38ed55 | 2019 | } |
2020 | ||
2021 | //_____________________________________________________________________________ | |
2022 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) | |
2023 | { | |
41702fec | 2024 | // |
66f6bfd9 | 2025 | // Fills clusters into TRD tracking sectors |
41702fec | 2026 | // |
41702fec | 2027 | |
9e85cb05 | 2028 | fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event |
2029 | ||
4d6aee34 | 2030 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 | 2031 | fClusters = AliTRDReconstructor::GetClusters(); |
2032 | } else { | |
e7542a7e | 2033 | if(!ReadClusters(cTree)) { |
66f6bfd9 | 2034 | AliError("Problem with reading the clusters !"); |
2035 | return 1; | |
2036 | } | |
2037 | } | |
2038 | SetClustersOwner(); | |
2039 | ||
48f8adf3 | 2040 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 | 2041 | AliInfo("No TRD clusters"); |
41702fec | 2042 | return 1; |
2043 | } | |
66f6bfd9 | 2044 | |
2045 | //Int_t nin = | |
2046 | BuildTrackingContainers(); | |
2047 | ||
2048 | //Int_t ncl = fClusters->GetEntriesFast(); | |
2049 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
2050 | ||
2051 | return 0; | |
2052 | } | |
2053 | ||
2054 | //_____________________________________________________________________________ | |
4d6aee34 | 2055 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters) |
66f6bfd9 | 2056 | { |
2057 | // | |
2058 | // Fills clusters into TRD tracking sectors | |
2059 | // Function for use in the HLT | |
2060 | ||
2061 | if(!clusters || !clusters->GetEntriesFast()){ | |
2062 | AliInfo("No TRD clusters"); | |
41702fec | 2063 | return 1; |
2064 | } | |
2065 | ||
66f6bfd9 | 2066 | fClusters = clusters; |
2067 | SetClustersOwner(); | |
2068 | ||
9e85cb05 | 2069 | fkRecoParam = fkReconstructor->GetRecoParam(); // load reco param for this event |
66f6bfd9 | 2070 | BuildTrackingContainers(); |
2071 | ||
2072 | //Int_t ncl = fClusters->GetEntriesFast(); | |
2073 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); | |
2074 | ||
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | ||
2079 | //____________________________________________________________________ | |
2080 | Int_t AliTRDtrackerV1::BuildTrackingContainers() | |
2081 | { | |
2082 | // Building tracking containers for clusters | |
2083 | ||
c79857d5 | 2084 | Int_t nin(0), ncl(fClusters->GetEntriesFast()); |
2085 | while (ncl--) { | |
2086 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(ncl); | |
41702fec | 2087 | if(c->IsInChamber()) nin++; |
4226b195 | 2088 | if(fkReconstructor->IsHLT()) c->SetRPhiMethod(AliTRDcluster::kCOG); |
41702fec | 2089 | Int_t detector = c->GetDetector(); |
2090 | Int_t sector = fGeom->GetSector(detector); | |
053767a4 | 2091 | Int_t stack = fGeom->GetStack(detector); |
2092 | Int_t layer = fGeom->GetLayer(detector); | |
41702fec | 2093 | |
0b559d95 | 2094 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, ncl); |
41702fec | 2095 | } |
b0a48c4d | 2096 | |
053767a4 | 2097 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec | 2098 | if(!fTrSec[isector].GetNChambers()) continue; |
c79857d5 | 2099 | fTrSec[isector].Init(fkReconstructor); |
41702fec | 2100 | } |
66f6bfd9 | 2101 | |
2102 | return nin; | |
eb38ed55 | 2103 | } |
2104 | ||
2105 | ||
66f6bfd9 | 2106 | |
0906e73e | 2107 | //____________________________________________________________________ |
172b6f82 | 2108 | void AliTRDtrackerV1::UnloadClusters() |
0906e73e | 2109 | { |
d4cf71ca | 2110 | // |
2111 | // Clears the arrays of clusters and tracks. Resets sectors and timebins | |
2112 | // If option "force" is also set the containers are also deleted. This is useful | |
2113 | // in case of HLT | |
2114 | ||
2115 | if(fTracks){ | |
2116 | fTracks->Delete(); | |
4d6aee34 | 2117 | if(HasRemoveContainers()){delete fTracks; fTracks = NULL;} |
d4cf71ca | 2118 | } |
2119 | if(fTracklets){ | |
2120 | fTracklets->Delete(); | |
4d6aee34 | 2121 | if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;} |
d4cf71ca | 2122 | } |
48f8adf3 | 2123 | if(fClusters){ |
2124 | if(IsClustersOwner()) fClusters->Delete(); | |
2125 | ||
2126 | // save clusters array in the reconstructor for further use. | |
4d6aee34 | 2127 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 | 2128 | AliTRDReconstructor::SetClusters(fClusters); |
2129 | SetClustersOwner(kFALSE); | |
4d6aee34 | 2130 | } else AliTRDReconstructor::SetClusters(NULL); |
48f8adf3 | 2131 | } |
0906e73e | 2132 | |
053767a4 | 2133 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e | 2134 | |
41702fec | 2135 | // Increment the Event Number |
2136 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); | |
eb38ed55 | 2137 | } |
0906e73e | 2138 | |
fac58f00 | 2139 | // //____________________________________________________________________ |
2140 | // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const | |
2141 | // { | |
2142 | // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t); | |
2143 | // if(!track) return; | |
2144 | // | |
4d6aee34 | 2145 | // AliTRDseedV1 *tracklet = NULL; |
fac58f00 | 2146 | // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){ |
2147 | // if(!(tracklet = track->GetTracklet(ily))) continue; | |
4d6aee34 | 2148 | // AliTRDcluster *c = NULL; |
8d2bec9e | 2149 | // for(Int_t ic=AliTRDseed::kNclusters; ic--;){ |
fac58f00 | 2150 | // if(!(c=tracklet->GetClusters(ic))) continue; |
2151 | // c->Use(); | |
2152 | // } | |
2153 | // } | |
2154 | // } | |
2155 | // | |
b1957d3c | 2156 | |
eb38ed55 | 2157 | //_____________________________________________________________________________ |
4d6aee34 | 2158 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track) |
eb38ed55 | 2159 | { |
41702fec | 2160 | // |
2161 | // Rotates the track when necessary | |
2162 | // | |
2163 | ||
2164 | Double_t alpha = AliTRDgeometry::GetAlpha(); | |
2165 | Double_t y = track->GetY(); | |
2166 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); | |
3cfaffa4 | 2167 | |
41702fec | 2168 | if (y > ymax) { |
2169 | if (!track->Rotate( alpha)) { | |
2170 | return kFALSE; | |
2171 | } | |
2172 | } | |
2173 | else if (y < -ymax) { | |
2174 | if (!track->Rotate(-alpha)) { | |
2175 | return kFALSE; | |
2176 | } | |
2177 | } | |
2178 | ||
2179 | return kTRUE; | |
0906e73e | 2180 | |
2181 | } | |
2182 | ||
eb38ed55 | 2183 | |
0906e73e | 2184 | //____________________________________________________________________ |
33ab3872 | 2185 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(const AliTRDtrackV1 *const track, Int_t p, Int_t &idx) |
0906e73e | 2186 | { |
41702fec | 2187 | // Find tracklet for TRD track <track> |
2188 | // Parameters | |
2189 | // - track | |
2190 | // - sector | |
2191 | // - plane | |
2192 | // - index | |
2193 | // Output | |
2194 | // tracklet | |
2195 | // index | |
2196 | // Detailed description | |
2197 | // | |
2198 | idx = track->GetTrackletIndex(p); | |
17896e82 | 2199 | AliTRDseedV1 *tracklet = (idx<0) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
41702fec | 2200 | |
2201 | return tracklet; | |
0906e73e | 2202 | } |
2203 | ||
2204 | //____________________________________________________________________ | |
4d6aee34 | 2205 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet) |
0906e73e | 2206 | { |
41702fec | 2207 | // Add this tracklet to the list of tracklets stored in the tracker |
2208 | // | |
2209 | // Parameters | |
2210 | // - tracklet : pointer to the tracklet to be added to the list | |
2211 | // | |
2212 | // Output | |
2213 | // - the index of the new tracklet in the tracker tracklets list | |
2214 | // | |
2215 | // Detailed description | |
2216 | // Build the tracklets list if it is not yet created (late initialization) | |
2217 | // and adds the new tracklet to the list. | |
2218 | // | |
2219 | if(!fTracklets){ | |
053767a4 | 2220 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec | 2221 | fTracklets->SetOwner(kTRUE); |
2222 | } | |
2223 | Int_t nentries = fTracklets->GetEntriesFast(); | |
2224 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); | |
972ef65e | 2225 | } |
2226 | ||
d20df6fc | 2227 | //____________________________________________________________________ |
4d6aee34 | 2228 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track) |
d20df6fc | 2229 | { |
2230 | // Add this track to the list of tracks stored in the tracker | |
2231 | // | |
2232 | // Parameters | |
2233 | // - track : pointer to the track to be added to the list | |
2234 | // | |
2235 | // Output | |
2236 | // - the pointer added | |
2237 | // | |
2238 | // Detailed description | |
2239 | // Build the tracks list if it is not yet created (late initialization) | |
2240 | // and adds the new track to the list. | |
2241 | // | |
2242 | if(!fTracks){ | |
053767a4 | 2243 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc | 2244 | fTracks->SetOwner(kTRUE); |
2245 | } | |
2246 | Int_t nentries = fTracks->GetEntriesFast(); | |
2247 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); | |
2248 | } | |
2249 | ||
2250 | ||
0906e73e | 2251 | |
e4f2f73d | 2252 | //____________________________________________________________________ |
eb38ed55 | 2253 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d | 2254 | { |
41702fec | 2255 | // |
2256 | // Steer tracking for one SM. | |
2257 | // | |
2258 | // Parameters : | |
2259 | // sector : Array of (SM) propagation layers containing clusters | |
2260 | // esd : The current ESD event. On output it contains the also | |
2261 | // the ESD (TRD) tracks found in this SM. | |
2262 | // | |
2263 | // Output : | |
2264 | // Number of tracks found in this TRD supermodule. | |
2265 | // | |
2266 | // Detailed description | |
2267 | // | |
2268 | // 1. Unpack AliTRDpropagationLayers objects for each stack. | |
2269 | // 2. Launch stack tracking. | |
2270 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. | |
2271 | // 3. Pack results in the ESD event. | |
2272 | // | |
2273 | ||
41702fec | 2274 | Int_t nTracks = 0; |
2275 | Int_t nChambers = 0; | |
4d6aee34 | 2276 | AliTRDtrackingChamber **stack = NULL, *chamber = NULL; |
053767a4 | 2277 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec | 2278 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
2279 | nChambers = 0; | |
053767a4 | 2280 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
2281 | if(!(chamber = stack[ilayer])) continue; | |
9e85cb05 | 2282 | if(chamber->GetNClusters() < fgNTimeBins * fkRecoParam->GetFindableClusters()) continue; |
41702fec | 2283 | nChambers++; |
053767a4 | 2284 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec | 2285 | } |
2286 | if(nChambers < 4) continue; | |
2287 | //AliInfo(Form("Doing stack %d", istack)); | |
b1135f96 | 2288 | nTracks += Clusters2TracksStack(stack, fTracksESD); |
41702fec | 2289 | } |
050875b0 | 2290 | if(nTracks) AliDebug(2, Form("Number of tracks: SM_%02d[%d]", sector, nTracks)); |
2291 | ||
352cef8f | 2292 | for(int itrack=0; itrack<nTracks; itrack++){ |
2293 | AliESDtrack *esdTrack((AliESDtrack*)(fTracksESD->operator[](itrack))); | |
2294 | Int_t id = esd->AddTrack(esdTrack); | |
2295 | ||
2296 | // set ESD id to stand alone TRD tracks | |
9e85cb05 | 2297 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
352cef8f | 2298 | esdTrack=esd->GetTrack(id); |
2299 | TObject *o(NULL); Int_t ic(0); | |
2300 | AliTRDtrackV1 *calibTrack(NULL); | |
2301 | while((o = esdTrack->GetCalibObject(ic++))){ | |
2302 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; | |
2303 | calibTrack->SetESDid(esdTrack->GetID()); | |
2304 | break; | |
2305 | } | |
2306 | } | |
2307 | } | |
41702fec | 2308 | |
2309 | // Reset Track and Candidate Number | |
2310 | AliTRDtrackerDebug::SetCandidateNumber(0); | |
2311 | AliTRDtrackerDebug::SetTrackNumber(0); | |
b1135f96 | 2312 | |
2313 | // delete ESD tracks in the array | |
2314 | fTracksESD->Delete(); | |
41702fec | 2315 | return nTracks; |
e4f2f73d | 2316 | } |
2317 | ||
2318 | //____________________________________________________________________ | |
4d6aee34 | 2319 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList) |
e4f2f73d | 2320 | { |
41702fec | 2321 | // |
2322 | // Make tracks in one TRD stack. | |
2323 | // | |
2324 | // Parameters : | |
2325 | // layer : Array of stack propagation layers containing clusters | |
2326 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. | |
2327 | // On exit the tracks found in this stack are appended. | |
2328 | // | |
2329 | // Output : | |
2330 | // Number of tracks found in this stack. | |
2331 | // | |
2332 | // Detailed description | |
2333 | // | |
2334 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. | |
2335 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. | |
2336 | // See AliTRDtrackerV1::MakeSeeds() for more details. | |
2337 | // 3. Arrange track candidates in decreasing order of their quality | |
2338 | // 4. Classify tracks in 5 categories according to: | |
2339 | // a) number of layers crossed | |
2340 | // b) track quality | |
2341 | // 5. Sign clusters by tracks in decreasing order of track quality | |
2342 | // 6. Build AliTRDtrack out of seeding tracklets | |
2343 | // 7. Cook MC label | |
2344 | // 8. Build ESD track and register it to the output list | |
2345 | // | |
2346 | ||
4d6aee34 | 2347 | AliTRDtrackingChamber *chamber = NULL; |
2348 | AliTRDtrackingChamber **ci = NULL; | |
41702fec | 2349 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
2350 | Int_t pars[4]; // MakeSeeds parameters | |
2351 | ||
2352 | //Double_t alpha = AliTRDgeometry::GetAlpha(); | |
2353 | //Double_t shift = .5 * alpha; | |
2354 | Int_t configs[kNConfigs]; | |
2355 | ||
fac58f00 | 2356 | // Purge used clusters from the containers |
2357 | ci = &stack[0]; | |
2358 | for(Int_t ic = kNPlanes; ic--; ci++){ | |
2359 | if(!(*ci)) continue; | |
2360 | (*ci)->Update(); | |
2361 | } | |
2362 | ||
41702fec | 2363 | // Build initial seeding configurations |
2364 | Double_t quality = BuildSeedingConfigs(stack, configs); | |
9e85cb05 | 2365 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){ |
41702fec | 2366 | AliInfo(Form("Plane config %d %d %d Quality %f" |
2367 | , configs[0], configs[1], configs[2], quality)); | |
2368 | } | |
d931f2aa | 2369 | |
41702fec | 2370 | |
2371 | // Initialize contors | |
2372 | Int_t ntracks, // number of TRD track candidates | |
2373 | ntracks1, // number of registered TRD tracks/iter | |
2374 | ntracks2 = 0; // number of all registered TRD tracks in stack | |
2375 | fSieveSeeding = 0; | |
d931f2aa | 2376 | |
2377 | // Get stack index | |
fac58f00 | 2378 | Int_t ic = 0; ci = &stack[0]; |
2379 | while(ic<kNPlanes && !(*ci)){ic++; ci++;} | |
2380 | if(!(*ci)) return ntracks2; | |
2381 | Int_t istack = fGeom->GetStack((*ci)->GetDetector()); | |
d931f2aa | 2382 | |
41702fec | 2383 | do{ |
2384 | // Loop over seeding configurations | |
2385 | ntracks = 0; ntracks1 = 0; | |
0b559d95 | 2386 | for (Int_t iconf = 0; iconf<fkRecoParam->GetNumberOfSeedConfigs(); iconf++) { |
41702fec | 2387 | pars[0] = configs[iconf]; |
2388 | pars[1] = ntracks; | |
d931f2aa | 2389 | pars[2] = istack; |
41702fec | 2390 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
6e39bde4 | 2391 | //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks)); |
41702fec | 2392 | if(ntracks == kMaxTracksStack) break; |
2393 | } | |
980d5a2a | 2394 | AliDebug(2, Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec | 2395 | if(!ntracks) break; |
2396 | ||
2397 | // Sort the seeds according to their quality | |
41f024fb | 2398 | Int_t sort[kMaxTracksStack+1]; |
41702fec | 2399 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); |
68f9b6bd | 2400 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 2){ |
2401 | AliDebug(3, "Track candidates classification:"); | |
2402 | for (Int_t it(0); it < ntracks; it++) { | |
2403 | Int_t jt(sort[it]); | |
2404 | printf(" %2d idx[%d] Quality[%e]\n", it, jt, fTrackQuality[jt]); | |
2405 | } | |
2406 | } | |
41702fec | 2407 | |
2408 | // Initialize number of tracks so far and logic switches | |
2409 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); | |
2410 | Bool_t signedTrack[kMaxTracksStack]; | |
2411 | Bool_t fakeTrack[kMaxTracksStack]; | |
2412 | for (Int_t i=0; i<ntracks; i++){ | |
2413 | signedTrack[i] = kFALSE; | |
2414 | fakeTrack[i] = kFALSE; | |
2415 | } | |
2416 | //AliInfo("Selecting track candidates ..."); | |
2417 | ||
2418 | // Sieve clusters in decreasing order of track quality | |
68f9b6bd | 2419 | Int_t jSieve(0), rejectedCandidates(0); |
41702fec | 2420 | do{ |
41702fec | 2421 | // Check track candidates |
68f9b6bd | 2422 | rejectedCandidates=0; |
41702fec | 2423 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { |
804bb02e | 2424 | Int_t trackIndex = sort[itrack]; |
2425 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; | |
41702fec | 2426 | |
804bb02e | 2427 | // Calculate track parameters from tracklets seeds |
804bb02e | 2428 | Int_t ncl = 0; |
2429 | Int_t nused = 0; | |
2430 | Int_t nlayers = 0; | |
2431 | Int_t findable = 0; | |
2432 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { | |
2433 | Int_t jseed = kNPlanes*trackIndex+jLayer; | |
68f9b6bd | 2434 | sseed[jseed].UpdateUsed(); |
804bb02e | 2435 | if(!sseed[jseed].IsOK()) continue; |
68f9b6bd | 2436 | // check if primary candidate |
f29f13a6 | 2437 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++; |
68f9b6bd | 2438 | ncl += sseed[jseed].GetN(); |
804bb02e | 2439 | nused += sseed[jseed].GetNUsed(); |
2440 | nlayers++; | |
804bb02e | 2441 | } |
2442 | ||
f29f13a6 | 2443 | // Filter duplicated tracks |
2444 | if (nused > 30){ | |
68f9b6bd | 2445 | AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused)); |
f29f13a6 | 2446 | fakeTrack[trackIndex] = kTRUE; |
2447 | continue; | |
2448 | } | |
5ef88e00 | 2449 | if (ncl>0 && Float_t(nused)/ncl >= .25){ |
68f9b6bd | 2450 | AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d] used/ncl[%f]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused, Float_t(nused)/ncl)); |
f29f13a6 | 2451 | fakeTrack[trackIndex] = kTRUE; |
2452 | continue; | |
2453 | } | |
41702fec | 2454 | |
68f9b6bd | 2455 | AliDebug(4, Form("Candidate[%d] Quality[%e] Tracklets[%d] Findable[%d] Ncl[%d] Nused[%d]", trackIndex, fTrackQuality[trackIndex], nlayers, findable, ncl, nused)); |
2456 | ||
f29f13a6 | 2457 | // Classify tracks |
2458 | Bool_t skip = kFALSE; | |
2459 | switch(jSieve){ | |
68f9b6bd | 2460 | case 0: // select 6 tracklets primary tracks, good quality |
2461 | if(nlayers > findable || nlayers < kNPlanes) {skip = kTRUE; break;} | |
f29f13a6 | 2462 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
2463 | break; | |
2464 | ||
68f9b6bd | 2465 | case 1: // select shorter primary tracks, good quality |
e7542a7e | 2466 | //if(findable<4){skip = kTRUE; break;} |
f29f13a6 | 2467 | if(nlayers < findable){skip = kTRUE; break;} |
2468 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} | |
2469 | break; | |
2470 | ||
68f9b6bd | 2471 | case 2: // select 6 tracklets secondary tracks |
2472 | if(nlayers < kNPlanes) { skip = kTRUE; break;} | |
f29f13a6 | 2473 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} |
2474 | break; | |
2475 | ||
68f9b6bd | 2476 | case 3: // select shorter tracks, good quality |
2477 | if (nlayers<4){skip = kTRUE; break;} | |
f29f13a6 | 2478 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
2479 | break; | |
2480 | ||
68f9b6bd | 2481 | case 4: // select anything with at least 4 tracklets |
2482 | if (nlayers<4){skip = kTRUE; break;} | |
f29f13a6 | 2483 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} |
2484 | break; | |
2485 | } | |
2486 | if(skip){ | |
68f9b6bd | 2487 | rejectedCandidates++; |
5ef88e00 | 2488 | AliDebug(4, Form("REJECTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused)); |
f29f13a6 | 2489 | continue; |
5ef88e00 | 2490 | } else AliDebug(4, Form("ACCEPTED : %d idx[%d] quality[%e] tracklets[%d] usedClusters[%d]", itrack, trackIndex, fTrackQuality[trackIndex], nlayers, nused)); |
2491 | ||
f29f13a6 | 2492 | signedTrack[trackIndex] = kTRUE; |
2493 | ||
68f9b6bd | 2494 | AliTRDseedV1 *lseed =&sseed[trackIndex*kNPlanes]; |
2495 | AliTRDtrackV1 *track = MakeTrack(lseed); | |
2496 | if(!track){ | |
2497 | AliDebug(1, "Track building failed."); | |
2498 | continue; | |
2499 | } else { | |
2500 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1") > 1){ | |
2501 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; | |
2502 | AliDebug(2, Form("Track pt=%7.2fGeV/c SM[%2d] Done.", track->Pt(), fGeom->GetSector(chamber->GetDetector()))); | |
2503 | } | |
2504 | } | |
f29f13a6 | 2505 | |
9e85cb05 | 2506 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){ |
eb2b4f91 | 2507 | //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); |
f29f13a6 | 2508 | |
f29f13a6 | 2509 | AliTRDseedV1 *dseed[6]; |
b82b4de1 | 2510 | for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]); |
f29f13a6 | 2511 | |
2512 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); | |
f29f13a6 | 2513 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2514 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); | |
2515 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
a2fbb6ec | 2516 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
f29f13a6 | 2517 | cstreamer << "Clusters2TracksStack" |
68f9b6bd | 2518 | << "EventNumber=" << eventNumber |
2519 | << "TrackNumber=" << trackNumber | |
2520 | << "CandidateNumber=" << candidateNumber | |
2521 | << "Iter=" << fSieveSeeding | |
2522 | << "Like=" << fTrackQuality[trackIndex] | |
2523 | << "S0.=" << dseed[0] | |
2524 | << "S1.=" << dseed[1] | |
2525 | << "S2.=" << dseed[2] | |
2526 | << "S3.=" << dseed[3] | |
2527 | << "S4.=" << dseed[4] | |
2528 | << "S5.=" << dseed[5] | |
2529 | << "Ncl=" << ncl | |
2530 | << "NLayers=" << nlayers | |
2531 | << "Findable=" << findable | |
2532 | << "NUsed=" << nused | |
f29f13a6 | 2533 | << "\n"; |
2534 | } | |
d877f55f | 2535 | |
68f9b6bd | 2536 | |
f29f13a6 | 2537 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); |
2538 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); | |
2539 | esdTrack->SetLabel(track->GetLabel()); | |
2540 | track->UpdateESDtrack(esdTrack); | |
2541 | // write ESD-friends if neccessary | |
9e85cb05 | 2542 | if (fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
f29f13a6 | 2543 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); |
2544 | calibTrack->SetOwner(); | |
2545 | esdTrack->AddCalibObject(calibTrack); | |
2546 | } | |
2547 | ntracks1++; | |
2548 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); | |
41702fec | 2549 | } |
2550 | ||
2551 | jSieve++; | |
68f9b6bd | 2552 | } while(jSieve<5 && rejectedCandidates); // end track candidates sieve |
41702fec | 2553 | if(!ntracks1) break; |
2554 | ||
2555 | // increment counters | |
2556 | ntracks2 += ntracks1; | |
4302c900 | 2557 | |
4d6aee34 | 2558 | if(fkReconstructor->IsHLT()) break; |
41702fec | 2559 | fSieveSeeding++; |
2560 | ||
2561 | // Rebuild plane configurations and indices taking only unused clusters into account | |
2562 | quality = BuildSeedingConfigs(stack, configs); | |
4d6aee34 | 2563 | if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec | 2564 | |
2565 | for(Int_t ip = 0; ip < kNPlanes; ip++){ | |
2566 | if(!(chamber = stack[ip])) continue; | |
c79857d5 | 2567 | chamber->Build(fGeom);//Indices(fSieveSeeding); |
41702fec | 2568 | } |
2569 | ||
9e85cb05 | 2570 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){ |
41702fec | 2571 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2572 | } | |
2573 | } while(fSieveSeeding<10); // end stack clusters sieve | |
2574 | ||
2575 | ||
2576 | ||
2577 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); | |
2578 | ||
2579 | return ntracks2; | |
e4f2f73d | 2580 | } |
2581 | ||
2582 | //___________________________________________________________________ | |
eb38ed55 | 2583 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d | 2584 | { |
41702fec | 2585 | // |
2586 | // Assign probabilities to chambers according to their | |
2587 | // capability of producing seeds. | |
2588 | // | |
2589 | // Parameters : | |
2590 | // | |
2591 | // layers : Array of stack propagation layers for all 6 chambers in one stack | |
2592 | // configs : On exit array of configuration indexes (see GetSeedingConfig() | |
2593 | // for details) in the decreasing order of their seeding probabilities. | |
2594 | // | |
2595 | // Output : | |
2596 | // | |
2597 | // Return top configuration quality | |
2598 | // | |
2599 | // Detailed description: | |
2600 | // | |
2601 | // To each chamber seeding configuration (see GetSeedingConfig() for | |
2602 | // the list of all configurations) one defines 2 quality factors: | |
2603 | // - an apriori topological quality (see GetSeedingConfig() for details) and | |
2604 | // - a data quality based on the uniformity of the distribution of | |
2605 | // clusters over the x range (time bins population). See CookChamberQA() for details. | |
2606 | // The overall chamber quality is given by the product of this 2 contributions. | |
2607 | // | |
2608 | ||
eb2b4f91 | 2609 | Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t)); |
4d6aee34 | 2610 | AliTRDtrackingChamber *chamber = NULL; |
41702fec | 2611 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2612 | if(!(chamber = stack[iplane])) continue; | |
2613 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; | |
2614 | } | |
2615 | ||
eb2b4f91 | 2616 | Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t)); |
2617 | Int_t planes[] = {0, 0, 0, 0}; | |
41702fec | 2618 | for(int iconf=0; iconf<kNConfigs; iconf++){ |
2619 | GetSeedingConfig(iconf, planes); | |
2620 | tconfig[iconf] = fgTopologicQA[iconf]; | |
2621 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; | |
2622 | } | |
2623 | ||
2624 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); | |
0b559d95 | 2625 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); |
41702fec | 2626 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); |
2627 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); | |
2628 | ||
2629 | return tconfig[configs[0]]; | |
e4f2f73d | 2630 | } |
2631 | ||
2632 | //____________________________________________________________________ | |
e17f4785 | 2633 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar) |
e4f2f73d | 2634 | { |
afa21247 | 2635 | // |
2a3191bb | 2636 | // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are |
2637 | // either missed by TPC prolongation or conversions inside the TRD volume. | |
2638 | // For stand alone tracking the procedure is used to estimate all tracks measured by TRD. | |
afa21247 | 2639 | // |
2640 | // Parameters : | |
2641 | // layers : Array of stack propagation layers containing clusters | |
2642 | // sseed : Array of empty tracklet seeds. On exit they are filled. | |
2643 | // ipar : Control parameters: | |
2644 | // ipar[0] -> seeding chambers configuration | |
2645 | // ipar[1] -> stack index | |
2646 | // ipar[2] -> number of track candidates found so far | |
2647 | // | |
2648 | // Output : | |
2649 | // Number of tracks candidates found. | |
2650 | // | |
2651 | // The following steps are performed: | |
2652 | // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the | |
2653 | // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding | |
2654 | // is described in AliTRDtrackerV1::Clusters2TracksStack(). | |
2655 | // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm: | |
2656 | // - for each seeding cluster in the lower seeding layer find | |
2657 | // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle | |
2658 | // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker. | |
2659 | // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the | |
2660 | // reco params | |
2661 | // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three | |
2662 | // seeding clusters. | |
2663 | // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond() | |
2664 | // and AliTRDchamberTimeBin::GetClusters(). | |
2665 | // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is | |
2666 | // performed at this level | |
2667 | // 4. Initialize seeding tracklets in the seeding chambers. | |
2668 | // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params. | |
2669 | // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see | |
2670 | // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25). | |
2671 | // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed. | |
2672 | // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new | |
2673 | // approximation of the track. | |
2674 | // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are | |
2675 | // checked against the Riemann fit: | |
2676 | // - position resolution in y | |
2677 | // - angular resolution in the bending plane | |
2678 | // - likelihood of the number of clusters attached to the tracklet | |
2679 | // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers: | |
2680 | // - Initialization of extrapolation tracklets with the fit parameters | |
2681 | // - Attach clusters to extrapolated tracklets | |
2682 | // - Helix fit of tracklets | |
2683 | // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track | |
2684 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. | |
2685 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation | |
2686 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. | |
2687 | // 14. Cooking labels for tracklets. Should be done only for MC | |
2688 | // 15. Register seeds. | |
2689 | // | |
2690 | // Authors: | |
2691 | // Marian Ivanov <M.Ivanov@gsi.de> | |
2692 | // Alexandru Bercuci <A.Bercuci@gsi.de> | |
2693 | // Markus Fasel <M.Fasel@gsi.de> | |
41702fec | 2694 | |
4d6aee34 | 2695 | AliTRDtrackingChamber *chamber = NULL; |
2696 | AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters | |
e17f4785 | 2697 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track |
41702fec | 2698 | Int_t ncl, mcl; // working variable for looping over clusters |
2699 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; | |
2700 | // chi2 storage | |
2701 | // chi2[0] = tracklet chi2 on the Z direction | |
2702 | // chi2[1] = tracklet chi2 on the R direction | |
2703 | Double_t chi2[4]; | |
2704 | ||
afa21247 | 2705 | // this should be data member of AliTRDtrack TODO |
41702fec | 2706 | Double_t seedQuality[kMaxTracksStack]; |
2707 | ||
2708 | // unpack control parameters | |
2709 | Int_t config = ipar[0]; | |
2710 | Int_t ntracks = ipar[1]; | |
d931f2aa | 2711 | Int_t istack = ipar[2]; |
41702fec | 2712 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
afa21247 | 2713 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
be24510a | 2714 | |
2715 | ||
41702fec | 2716 | // Init chambers geometry |
41702fec | 2717 | Double_t hL[kNPlanes]; // Tilting angle |
2718 | Float_t padlength[kNPlanes]; // pad lenghts | |
dd8059a8 | 2719 | Float_t padwidth[kNPlanes]; // pad widths |
4d6aee34 | 2720 | AliTRDpadPlane *pp = NULL; |
41702fec | 2721 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2722 | pp = fGeom->GetPadPlane(iplane, istack); | |
bb79ccd5 | 2723 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec | 2724 | padlength[iplane] = pp->GetLengthIPad(); |
dd8059a8 | 2725 | padwidth[iplane] = pp->GetWidthIPad(); |
41702fec | 2726 | } |
2727 | ||
eb2b4f91 | 2728 | // Init anode wire position for chambers |
e165b64b | 2729 | Double_t x0[kNPlanes], // anode wire position |
eb2b4f91 | 2730 | driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length |
4d6aee34 | 2731 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 | 2732 | Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.}; |
2733 | Double_t glb[] = {0., 0., 0.}; | |
2734 | AliTRDtrackingChamber **cIter = &stack[0]; | |
a3743898 | 2735 | for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){ |
eb2b4f91 | 2736 | if(!(*cIter)) continue; |
e165b64b | 2737 | if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){ |
e165b64b | 2738 | x0[iLayer] = fgkX0[iLayer]; |
e7542a7e | 2739 | continue; |
e165b64b | 2740 | } |
eb2b4f91 | 2741 | matrix->LocalToMaster(loc, glb); |
2742 | x0[iLayer] = glb[0]; | |
2743 | } | |
2744 | ||
980d5a2a | 2745 | AliDebug(2, Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
41702fec | 2746 | |
d931f2aa | 2747 | // Build seeding layers |
d611c74f | 2748 | ResetSeedTB(); |
41702fec | 2749 | Int_t nlayers = 0; |
41702fec | 2750 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2751 | if(!(chamber = stack[planes[isl]])) continue; | |
4d6aee34 | 2752 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue; |
41702fec | 2753 | nlayers++; |
41702fec | 2754 | } |
eb2b4f91 | 2755 | if(nlayers < kNSeedPlanes) return ntracks; |
41702fec | 2756 | |
2757 | ||
2758 | // Start finding seeds | |
2759 | Double_t cond0[4], cond1[4], cond2[4]; | |
2760 | Int_t icl = 0; | |
d611c74f | 2761 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec | 2762 | if(!c[3]) continue; |
d611c74f | 2763 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2764 | fSeedTB[0]->GetClusters(cond0, index, ncl); | |
41702fec | 2765 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2766 | Int_t jcl = 0; | |
2767 | while(jcl<ncl) { | |
d611c74f | 2768 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec | 2769 | if(!c[0]) continue; |
2770 | Double_t dx = c[3]->GetX() - c[0]->GetX(); | |
afa21247 | 2771 | Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx; |
2772 | Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx; | |
2773 | fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx); | |
d611c74f | 2774 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); |
41702fec | 2775 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2776 | ||
2777 | Int_t kcl = 0; | |
2778 | while(kcl<mcl) { | |
d611c74f | 2779 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2780 | if(!c[1]) continue; | |
afa21247 | 2781 | fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx); |
d611c74f | 2782 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); |
2783 | //printf("Found c[1] candidate 2 %p\n", c[2]); | |
2784 | if(!c[2]) continue; | |
980d5a2a | 2785 | |
2786 | AliDebug(3, Form("Seeding clusters\n 0[%6.3f %6.3f %6.3f]\n 1[%6.3f %6.3f %6.3f]\n 2[%6.3f %6.3f %6.3f]\n 3[%6.3f %6.3f %6.3f].", | |
2787 | c[0]->GetX(), c[0]->GetY(), c[0]->GetZ(), | |
2788 | c[1]->GetX(), c[1]->GetY(), c[1]->GetZ(), | |
2789 | c[2]->GetX(), c[2]->GetY(), c[2]->GetZ(), | |
2790 | c[3]->GetX(), c[3]->GetY(), c[3]->GetZ())); | |
d611c74f | 2791 | |
804bb02e | 2792 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec | 2793 | |
d611c74f | 2794 | FitRieman(c, chi2); |
2795 | ||
d931f2aa | 2796 | AliTRDseedV1 *tseed = &cseed[0]; |
bb2db46c | 2797 | cIter = &stack[0]; |
2798 | for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){ | |
2799 | Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1; | |
eb2b4f91 | 2800 | tseed->SetDetector(det); |
43d6ad34 | 2801 | tseed->SetTilt(hL[iLayer]); |
2802 | tseed->SetPadLength(padlength[iLayer]); | |
dd8059a8 | 2803 | tseed->SetPadWidth(padwidth[iLayer]); |
4d6aee34 | 2804 | tseed->SetReconstructor(fkReconstructor); |
eb2b4f91 | 2805 | tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]); |
d611c74f | 2806 | tseed->Init(GetRiemanFitter()); |
f29f13a6 | 2807 | tseed->SetStandAlone(kTRUE); |
d611c74f | 2808 | } |
2809 | ||
2810 | Bool_t isFake = kFALSE; | |
9e85cb05 | 2811 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
d611c74f | 2812 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2813 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2814 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; | |
2815 | ||
2816 | Double_t xpos[4]; | |
2817 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); | |
2818 | Float_t yref[4]; | |
2819 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); | |
2820 | Int_t ll = c[3]->GetLabel(0); | |
2821 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2822 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2823 | AliRieman *rim = GetRiemanFitter(); | |
a2fbb6ec | 2824 | TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f | 2825 | cs0 << "MakeSeeds0" |
2826 | <<"EventNumber=" << eventNumber | |
2827 | <<"CandidateNumber=" << candidateNumber | |
2828 | <<"isFake=" << isFake | |
2829 | <<"config=" << config | |
2830 | <<"label=" << ll | |
2831 | <<"chi2z=" << chi2[0] | |
2832 | <<"chi2y=" << chi2[1] | |
2833 | <<"Y2exp=" << cond2[0] | |
2834 | <<"Z2exp=" << cond2[1] | |
2835 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() | |
2836 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() | |
2837 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() | |
2838 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() | |
2839 | <<"yref0=" << yref[0] | |
2840 | <<"yref1=" << yref[1] | |
2841 | <<"yref2=" << yref[2] | |
2842 | <<"yref3=" << yref[3] | |
2843 | <<"c0.=" << c[0] | |
2844 | <<"c1.=" << c[1] | |
2845 | <<"c2.=" << c[2] | |
2846 | <<"c3.=" << c[3] | |
2847 | <<"Seed0.=" << &cseed[planes[0]] | |
2848 | <<"Seed1.=" << &cseed[planes[1]] | |
2849 | <<"Seed2.=" << &cseed[planes[2]] | |
2850 | <<"Seed3.=" << &cseed[planes[3]] | |
2851 | <<"RiemanFitter.=" << rim | |
2852 | <<"\n"; | |
2853 | } | |
9e85cb05 | 2854 | if(chi2[0] > fkRecoParam->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
980d5a2a | 2855 | AliDebug(3, Form("Filter on chi2Z [%f].", chi2[0])); |
d611c74f | 2856 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2857 | continue; | |
2858 | } | |
9e85cb05 | 2859 | if(chi2[1] > fkRecoParam->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
980d5a2a | 2860 | AliDebug(3, Form("Filter on chi2Y [%f].", chi2[1])); |
d611c74f | 2861 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2862 | continue; | |
2863 | } | |
2864 | //AliInfo("Passed chi2 filter."); | |
2865 | ||
2866 | // try attaching clusters to tracklets | |
6e39bde4 | 2867 | Int_t mlayers = 0; |
980d5a2a | 2868 | AliTRDcluster *cl = NULL; |
be24510a | 2869 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f | 2870 | Int_t jLayer = planes[iLayer]; |
980d5a2a | 2871 | Int_t nNotInChamber = 0; |
f29f13a6 | 2872 | if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue; |
980d5a2a | 2873 | if(/*fkReconstructor->IsHLT()*/kFALSE){ |
2874 | cseed[jLayer].UpdateUsed(); | |
2875 | if(!cseed[jLayer].IsOK()) continue; | |
2876 | }else{ | |
2877 | cseed[jLayer].Fit(); | |
2878 | cseed[jLayer].UpdateUsed(); | |
2879 | cseed[jLayer].ResetClusterIter(); | |
2880 | while((cl = cseed[jLayer].NextCluster())){ | |
2881 | if(!cl->IsInChamber()) nNotInChamber++; | |
2882 | } | |
2883 | //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber); | |
2884 | 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 | |
2885 | } | |
d611c74f | 2886 | mlayers++; |
2887 | } | |
be24510a | 2888 | |
2889 | if(mlayers < kNSeedPlanes){ | |
980d5a2a | 2890 | AliDebug(2, Form("Found only %d tracklets out of %d. Skip.", mlayers, kNSeedPlanes)); |
be24510a | 2891 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2892 | continue; | |
2893 | } | |
2894 | ||
2895 | // temporary exit door for the HLT | |
4d6aee34 | 2896 | if(fkReconstructor->IsHLT()){ |
be24510a | 2897 | // attach clusters to extrapolation chambers |
2898 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ | |
2899 | Int_t jLayer = planesExt[iLayer]; | |
2900 | if(!(chamber = stack[jLayer])) continue; | |
980d5a2a | 2901 | if(!cseed[jLayer].AttachClusters(chamber, kTRUE)) continue; |
5f1ae1e7 | 2902 | cseed[jLayer].Fit(); |
be24510a | 2903 | } |
0b559d95 | 2904 | //FitTiltedRiemanConstraint(&cseed[0], GetZ()); |
4302c900 | 2905 | fTrackQuality[ntracks] = 1.; // dummy value |
2906 | ntracks++; | |
218ba867 | 2907 | if(ntracks == kMaxTracksStack) return ntracks; |
4302c900 | 2908 | cseed += 6; |
2909 | continue; | |
2910 | } | |
2911 | ||
be24510a | 2912 | |
f29f13a6 | 2913 | // Update Seeds and calculate Likelihood |
d611c74f | 2914 | // fit tracklets and cook likelihood |
68f9b6bd | 2915 | Double_t chi2Vals[4]; |
2916 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE); | |
f29f13a6 | 2917 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
2918 | Int_t jLayer = planes[iLayer]; | |
2eb10c34 | 2919 | cseed[jLayer].Fit(1); |
f29f13a6 | 2920 | } |
91834b8d | 2921 | Double_t like = CookLikelihood(&cseed[0], planes); // to be checked |
d611c74f | 2922 | |
9e85cb05 | 2923 | if (TMath::Log(1.E-9 + like) < fkRecoParam->GetTrackLikelihood()){ |
980d5a2a | 2924 | AliDebug(3, Form("Filter on likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
d611c74f | 2925 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2926 | continue; | |
2927 | } | |
2928 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); | |
2929 | ||
2930 | // book preliminary results | |
2931 | seedQuality[ntracks] = like; | |
2932 | fSeedLayer[ntracks] = config;/*sLayer;*/ | |
2933 | ||
2934 | // attach clusters to the extrapolation seeds | |
980d5a2a | 2935 | Int_t elayers(0); |
be24510a | 2936 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2937 | Int_t jLayer = planesExt[iLayer]; | |
d611c74f | 2938 | if(!(chamber = stack[jLayer])) continue; |
d611c74f | 2939 | |
2940 | // fit extrapolated seed | |
2941 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; | |
2942 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; | |
2943 | AliTRDseedV1 pseed = cseed[jLayer]; | |
f29f13a6 | 2944 | if(!pseed.AttachClusters(chamber, kTRUE)) continue; |
2eb10c34 | 2945 | pseed.Fit(1); |
d611c74f | 2946 | cseed[jLayer] = pseed; |
68f9b6bd | 2947 | chi2Vals[0] = FitTiltedRieman(cseed, kTRUE); |
2eb10c34 | 2948 | cseed[jLayer].Fit(1); |
980d5a2a | 2949 | elayers++; |
d611c74f | 2950 | } |
2951 | ||
2952 | // AliInfo("Extrapolation done."); | |
2953 | // Debug Stream containing all the 6 tracklets | |
9e85cb05 | 2954 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
a2fbb6ec | 2955 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f | 2956 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2957 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); | |
2958 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2959 | cstreamer << "MakeSeeds1" | |
2960 | << "EventNumber=" << eventNumber | |
2961 | << "CandidateNumber=" << candidateNumber | |
2962 | << "S0.=" << &cseed[0] | |
2963 | << "S1.=" << &cseed[1] | |
2964 | << "S2.=" << &cseed[2] | |
2965 | << "S3.=" << &cseed[3] | |
2966 | << "S4.=" << &cseed[4] | |
2967 | << "S5.=" << &cseed[5] | |
2968 | << "FitterT.=" << tiltedRieman | |
2969 | << "\n"; | |
2970 | } | |
2971 | ||
9e85cb05 | 2972 | if(fkRecoParam->HasImproveTracklets()){ |
68f9b6bd | 2973 | if(!ImproveSeedQuality(stack, cseed, chi2Vals[0])){ |
980d5a2a | 2974 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
68f9b6bd | 2975 | AliDebug(3, "ImproveSeedQuality() failed."); |
980d5a2a | 2976 | } |
d611c74f | 2977 | } |
d611c74f | 2978 | |
68f9b6bd | 2979 | // do track fitting with vertex constraint |
2980 | if(fkRecoParam->IsVertexConstrained()) chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); | |
2981 | else chi2Vals[1] = -1.; | |
2982 | chi2Vals[2] = GetChi2Z(&cseed[0]); | |
2983 | chi2Vals[3] = GetChi2Phi(&cseed[0]); | |
2984 | ||
2985 | // calculate track quality | |
2986 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&chi2Vals[0]); | |
fac58f00 | 2987 | |
9e85cb05 | 2988 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
a2fbb6ec | 2989 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f | 2990 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2991 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
2992 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); | |
2993 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); | |
91834b8d | 2994 | Int_t ncls = 0; |
2995 | for(Int_t iseed = 0; iseed < kNPlanes; iseed++){ | |
2996 | ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0; | |
2997 | } | |
d611c74f | 2998 | cstreamer << "MakeSeeds2" |
2999 | << "EventNumber=" << eventNumber | |
3000 | << "CandidateNumber=" << candidateNumber | |
3001 | << "Chi2TR=" << chi2Vals[0] | |
3002 | << "Chi2TC=" << chi2Vals[1] | |
3003 | << "Nlayers=" << mlayers | |
91834b8d | 3004 | << "NClusters=" << ncls |
d611c74f | 3005 | << "Like=" << like |
3006 | << "S0.=" << &cseed[0] | |
3007 | << "S1.=" << &cseed[1] | |
3008 | << "S2.=" << &cseed[2] | |
3009 | << "S3.=" << &cseed[3] | |
3010 | << "S4.=" << &cseed[4] | |
3011 | << "S5.=" << &cseed[5] | |
d611c74f | 3012 | << "FitterT.=" << fitterT |
3013 | << "FitterTC.=" << fitterTC | |
3014 | << "\n"; | |
3015 | } | |
68f9b6bd | 3016 | if(AliLog::GetDebugLevel("TRD", "AliTRDtrackerV1")){ |
3017 | Double_t pt[]={0., 0.}; | |
3018 | for(Int_t il(0); il<kNPlanes; il++){ | |
3019 | if(!cseed[il].IsOK()) continue; | |
3020 | pt[0] = GetBz()*kB2C/cseed[il].GetC(); | |
3021 | pt[1] = GetBz()*kB2C/cseed[il].GetC(1); | |
3022 | break; | |
3023 | } | |
3024 | AliDebug(2, Form("Candidate[%2d] pt[%7.3f %7.3f] Q[%e]\n" | |
3025 | " [0] x[%6.2f] n[%2d] nu[%d] OK[%c]\n" | |
3026 | " [1] x[%6.2f] n[%2d] nu[%d] OK[%c]\n" | |
3027 | " [2] x[%6.2f] n[%2d] nu[%d] OK[%c]\n" | |
3028 | " [3] x[%6.2f] n[%2d] nu[%d] OK[%c]\n" | |
3029 | " [4] x[%6.2f] n[%2d] nu[%d] OK[%c]\n" | |
3030 | " [5] x[%6.2f] n[%2d] nu[%d] OK[%c]" | |
3031 | , ntracks, pt[0], pt[1], fTrackQuality[ntracks] | |
3032 | ,cseed[0].GetX(), cseed[0].GetN(), cseed[0].GetNUsed(), cseed[0].IsOK()?'y':'n' | |
3033 | ,cseed[1].GetX(), cseed[1].GetN(), cseed[1].GetNUsed(), cseed[1].IsOK()?'y':'n' | |
3034 | ,cseed[2].GetX(), cseed[2].GetN(), cseed[2].GetNUsed(), cseed[2].IsOK()?'y':'n' | |
3035 | ,cseed[3].GetX(), cseed[3].GetN(), cseed[3].GetNUsed(), cseed[3].IsOK()?'y':'n' | |
3036 | ,cseed[4].GetX(), cseed[4].GetN(), cseed[4].GetNUsed(), cseed[4].IsOK()?'y':'n' | |
3037 | ,cseed[5].GetX(), cseed[5].GetN(), cseed[5].GetNUsed(), cseed[5].IsOK()?'y':'n')); | |
3038 | } | |
d611c74f | 3039 | ntracks++; |
3040 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); | |
3041 | if(ntracks == kMaxTracksStack){ | |
3042 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); | |
3043 | return ntracks; | |
3044 | } | |
3045 | cseed += 6; | |
41702fec | 3046 | } |
3047 | } | |
3048 | } | |
41702fec | 3049 | |
3050 | return ntracks; | |
e4f2f73d | 3051 | } |
3052 | ||
3053 | //_____________________________________________________________________________ | |
68f9b6bd | 3054 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const tracklet) |
e4f2f73d | 3055 | { |
afa21247 | 3056 | // |
3057 | // Build a TRD track out of tracklet candidates | |
3058 | // | |
3059 | // Parameters : | |
3060 | // seeds : array of tracklets | |
3061 | // params : array of track parameters as they are estimated by stand alone tracker. 7 elements. | |
3062 | // [0] - radial position of the track at reference point | |
3063 | // [1] - y position of the fit at [0] | |
3064 | // [2] - z position of the fit at [0] | |
3065 | // [3] - snp of the first tracklet | |
3066 | // [4] - tgl of the first tracklet | |
3067 | // [5] - curvature of the Riemann fit - 1/pt | |
3068 | // [6] - sector rotation angle | |
3069 | // | |
3070 | // Output : | |
3071 | // The TRD track. | |
3072 | // | |
3073 | // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix | |
3074 | // (diagonal with constant variance terms TODO - correct parameterization) | |
3075 | // | |
3076 | // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the | |
3077 | // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation() | |
3078 | // for details). Do also MC label calculation and PID if propagation successfully. | |
41702fec | 3079 | |
0b559d95 | 3080 | if(fkReconstructor->IsHLT()) FitTiltedRiemanConstraint(tracklet, 0); |
41702fec | 3081 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
3082 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; | |
41702fec | 3083 | |
68f9b6bd | 3084 | // find first good tracklet |
3085 | Int_t idx(0); while(idx<kNPlanes && !tracklet[idx].IsOK()) idx++; | |
3086 | if(idx>2){ AliDebug(1, Form("Found suspect track start @ layer idx[%d]\n" | |
3087 | " %c[0] x0[%f] n[%d] nu[%d] OK[%c]\n" | |
3088 | " %c[1] x0[%f] n[%d] nu[%d] OK[%c]\n" | |
3089 | " %c[2] x0[%f] n[%d] nu[%d] OK[%c]\n" | |
3090 | " %c[3] x0[%f] n[%d] nu[%d] OK[%c]\n" | |
3091 | " %c[4] x0[%f] n[%d] nu[%d] OK[%c]\n" | |
3092 | " %c[5] x0[%f] n[%d] nu[%d] OK[%c]" | |
3093 | ,idx | |
3094 | ,idx==0?'*':' ', tracklet[0].GetX0(), tracklet[0].GetN(), tracklet[0].GetNUsed(), tracklet[0].IsOK()?'y':'n' | |
3095 | ,idx==1?'*':' ', tracklet[1].GetX0(), tracklet[1].GetN(), tracklet[1].GetNUsed(), tracklet[1].IsOK()?'y':'n' | |
3096 | ,idx==2?'*':' ', tracklet[2].GetX0(), tracklet[2].GetN(), tracklet[2].GetNUsed(), tracklet[2].IsOK()?'y':'n' | |
3097 | ,idx==3?'*':' ', tracklet[3].GetX0(), tracklet[3].GetN(), tracklet[3].GetNUsed(), tracklet[3].IsOK()?'y':'n' | |
3098 | ,idx==4?'*':' ', tracklet[4].GetX0(), tracklet[4].GetN(), tracklet[4].GetNUsed(), tracklet[4].IsOK()?'y':'n' | |
3099 | ,idx==5?'*':' ', tracklet[5].GetX0(), tracklet[5].GetN(), tracklet[5].GetNUsed(), tracklet[5].IsOK()?'y':'n')); | |
3100 | return NULL; | |
3101 | } | |
3102 | ||
8def512c | 3103 | Double_t dx(5.); |
3104 | Double_t x(tracklet[idx].GetX0() - dx); | |
68f9b6bd | 3105 | // Build track parameters |
3106 | Double_t params[] = { | |
3107 | tracklet[idx].GetYref(0) - dx*tracklet[idx].GetYref(1) // y | |
3108 | ,tracklet[idx].GetZref(0) - dx*tracklet[idx].GetZref(1) // z | |
3109 | ,TMath::Sin(TMath::ATan(tracklet[idx].GetYref(1))) // snp | |
3110 | ,tracklet[idx].GetZref(1) / TMath::Sqrt(1. + tracklet[idx].GetYref(1) * tracklet[idx].GetYref(1)) // tgl | |
8def512c | 3111 | ,tracklet[idx].GetC(fkReconstructor->IsHLT()?1:0) // curvature -> 1/pt |
68f9b6bd | 3112 | }; |
3113 | Int_t sector(fGeom->GetSector(tracklet[idx].GetDetector())); | |
3114 | ||
3115 | Double_t c[15]; | |
afa21247 | 3116 | c[ 0] = 0.2; // s^2_y |
3117 | c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z | |
3118 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp | |
3119 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl | |
68f9b6bd | 3120 | c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[4]*params[4]*0.01; // s^2_1/pt |
3121 | ||
3122 | AliTRDtrackV1 track(tracklet, params, c, x, sector*alpha+shift); | |
41702fec | 3123 | |
4d6aee34 | 3124 | AliTRDseedV1 *ptrTracklet = NULL; |
9887cc9f | 3125 | |
3126 | // skip Kalman filter for HLT | |
5f1ae1e7 | 3127 | if(/*fkReconstructor->IsHLT()*/kFALSE){ |
9887cc9f | 3128 | for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) { |
3129 | track.UnsetTracklet(jLayer); | |
68f9b6bd | 3130 | ptrTracklet = &tracklet[jLayer]; |
9887cc9f | 3131 | if(!ptrTracklet->IsOK()) continue; |
5f1ae1e7 | 3132 | if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian |
9887cc9f | 3133 | ptrTracklet = SetTracklet(ptrTracklet); |
f29f13a6 | 3134 | ptrTracklet->UseClusters(); |
91834b8d | 3135 | track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
3136 | } | |
d78d7df0 | 3137 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
799e38d7 | 3138 | ptrTrack->CookPID(); |
5f1ae1e7 | 3139 | ptrTrack->CookLabel(.9); |
4d6aee34 | 3140 | ptrTrack->SetReconstructor(fkReconstructor); |
d78d7df0 | 3141 | return ptrTrack; |
91834b8d | 3142 | } |
393fda1c | 3143 | |
b1135f96 | 3144 | // prevent the error message in AliTracker::MeanMaterialBudget: "start point out of geometry" |
68f9b6bd | 3145 | if(TMath::Abs(track.GetX()) + TMath::Abs(track.GetY()) + TMath::Abs(track.GetZ()) > 10000) return NULL; |
17e0e535 | 3146 | |
d20df6fc | 3147 | track.ResetCovariance(1); |
e79f8eb0 | 3148 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
9e85cb05 | 3149 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){ |
393fda1c | 3150 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3151 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
3152 | Double_t p[5]; // Track Params for the Debug Stream | |
68f9b6bd | 3153 | track.GetExternalParameters(x, p); |
a2fbb6ec | 3154 | TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
393fda1c | 3155 | cs << "MakeTrack" |
3156 | << "EventNumber=" << eventNumber | |
3157 | << "CandidateNumber=" << candidateNumber | |
3158 | << "nc=" << nc | |
68f9b6bd | 3159 | << "X=" << x |
393fda1c | 3160 | << "Y=" << p[0] |
3161 | << "Z=" << p[1] | |
3162 | << "snp=" << p[2] | |
3163 | << "tnd=" << p[3] | |
3164 | << "crv=" << p[4] | |
68f9b6bd | 3165 | << "Yin=" << params[0] |
3166 | << "Zin=" << params[1] | |
3167 | << "snpin=" << params[2] | |
3168 | << "tndin=" << params[3] | |
3169 | << "crvin=" << params[4] | |
393fda1c | 3170 | << "track.=" << &track |
3171 | << "\n"; | |
3172 | } | |
68f9b6bd | 3173 | if (nc < 30){ |
3174 | UnsetTrackletsTrack(&track); | |
3175 | return NULL; | |
3176 | } | |
d20df6fc | 3177 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
4d6aee34 | 3178 | ptrTrack->SetReconstructor(fkReconstructor); |
48f8adf3 | 3179 | ptrTrack->CookLabel(.9); |
68f9b6bd | 3180 | for(Int_t il(kNPlanes); il--;){ |
3181 | if(!(ptrTracklet = ptrTrack->GetTracklet(il))) continue; | |
3182 | ptrTracklet->UseClusters(); | |
3183 | } | |
3184 | ||
d20df6fc | 3185 | // computes PID for track |
3186 | ptrTrack->CookPID(); | |
3187 | // update calibration references using this track | |
48f8adf3 | 3188 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
e7542a7e | 3189 | if(!calibra){ |
3190 | AliInfo("Could not get Calibra instance."); | |
3191 | } else if(calibra->GetHisto2d()){ | |
3192 | calibra->UpdateHistogramsV1(ptrTrack); | |
48f8adf3 | 3193 | } |
d20df6fc | 3194 | return ptrTrack; |
e4f2f73d | 3195 | } |
3196 | ||
0906e73e | 3197 | |
e4f2f73d | 3198 | //____________________________________________________________________ |
68f9b6bd | 3199 | Bool_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed, Double_t &chi2) |
e4f2f73d | 3200 | { |
41702fec | 3201 | // |
3202 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst | |
3203 | // | |
3204 | // Parameters : | |
3205 | // layers : Array of propagation layers for a stack/supermodule | |
3206 | // cseed : Array of 6 seeding tracklets which has to be improved | |
3207 | // | |
f29f13a6 | 3208 | // Output : |
41702fec | 3209 | // cssed : Improved seeds |
3210 | // | |
3211 | // Detailed description | |
3212 | // | |
3213 | // Iterative procedure in which new clusters are searched for each | |
3214 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) | |
3215 | // can be maximized. If some optimization is found the old seeds are replaced. | |
3216 | // | |
3217 | // debug level: 7 | |
3218 | // | |
3219 | ||
3220 | // make a local working copy | |
4d6aee34 | 3221 | AliTRDtrackingChamber *chamber = NULL; |
980d5a2a | 3222 | AliTRDseedV1 bseed[AliTRDgeometry::kNlayer]; |
3223 | ||
68f9b6bd | 3224 | Float_t quality(1.e3), |
e7542a7e | 3225 | lQuality[AliTRDgeometry::kNlayer] = {1.e3, 1.e3, 1.e3, 1.e3, 1.e3, 1.e3}; |
980d5a2a | 3226 | Int_t rLayers(0); |
3227 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;){ | |
3228 | bseed[jLayer] = cseed[jLayer]; | |
3229 | if(!bseed[jLayer].IsOK()) continue; | |
3230 | rLayers++; | |
3231 | lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE); | |
3232 | quality += lQuality[jLayer]; | |
3233 | } | |
ce42378b | 3234 | if (rLayers > 0) { |
3235 | quality /= rLayers; | |
3236 | } | |
68f9b6bd | 3237 | AliDebug(2, Form("Start N[%d] Q[%f] chi2[%f]", rLayers, quality, chi2)); |
41702fec | 3238 | |
3239 | for (Int_t iter = 0; iter < 4; iter++) { | |
980d5a2a | 3240 | // Try better cluster set |
3241 | Int_t nLayers(0); Float_t qualitynew(0.); | |
41f024fb | 3242 | Int_t indexes[4*AliTRDgeometry::kNlayer]; |
980d5a2a | 3243 | TMath::Sort(Int_t(AliTRDgeometry::kNlayer), lQuality, indexes, kFALSE); |
3244 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) { | |
3245 | Int_t bLayer = indexes[jLayer]; | |
3246 | bseed[bLayer].Reset("c"); | |
41702fec | 3247 | if(!(chamber = stack[bLayer])) continue; |
980d5a2a | 3248 | if(!bseed[bLayer].AttachClusters(chamber, kTRUE)) continue; |
2eb10c34 | 3249 | bseed[bLayer].Fit(1); |
980d5a2a | 3250 | if(!bseed[bLayer].IsOK()) continue; |
3251 | nLayers++; | |
3252 | lQuality[jLayer] = bseed[jLayer].GetQuality(kTRUE); | |
3253 | qualitynew += lQuality[jLayer]; | |
41702fec | 3254 | } |
980d5a2a | 3255 | if(rLayers > nLayers){ |
3256 | AliDebug(1, Form("Lost %d tracklets while improving.", rLayers-nLayers)); | |
68f9b6bd | 3257 | return iter>0?kTRUE:kFALSE; |
980d5a2a | 3258 | } else rLayers=nLayers; |
68f9b6bd | 3259 | qualitynew /= rLayers; |
980d5a2a | 3260 | |
68f9b6bd | 3261 | if(qualitynew > quality){ |
3262 | AliDebug(4, Form("Quality[%f] worsen in iter[%d] to ref[%f].", qualitynew, iter, quality)); | |
3263 | return iter>0?kTRUE:kFALSE; | |
980d5a2a | 3264 | } else quality = qualitynew; |
3265 | ||
3266 | // try improve track parameters | |
68f9b6bd | 3267 | Float_t chi2new = FitTiltedRieman(bseed, kTRUE); |
980d5a2a | 3268 | if(chi2new > chi2){ |
68f9b6bd | 3269 | AliDebug(4, Form("Chi2[%f] worsen in iter[%d] to ref[%f].", chi2new, iter, chi2)); |
3270 | return iter>0?kTRUE:kFALSE; | |
980d5a2a | 3271 | } else chi2 = chi2new; |
3272 | ||
3273 | // store better tracklets | |
68f9b6bd | 3274 | for(Int_t jLayer=AliTRDgeometry::kNlayer; jLayer--;) cseed[jLayer]=bseed[jLayer]; |
3275 | AliDebug(2, Form("Iter[%d] Q[%f] chi2[%f]", iter, quality, chi2)); | |
980d5a2a | 3276 | |
41702fec | 3277 | |
9e85cb05 | 3278 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){ |
41702fec | 3279 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3280 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
3281 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); | |
a2fbb6ec | 3282 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec | 3283 | cstreamer << "ImproveSeedQuality" |
980d5a2a | 3284 | << "EventNumber=" << eventNumber |
3285 | << "CandidateNumber=" << candidateNumber | |
3286 | << "Iteration=" << iter | |
68f9b6bd | 3287 | << "S0.=" << &cseed[0] |
3288 | << "S1.=" << &cseed[1] | |
3289 | << "S2.=" << &cseed[2] | |
3290 | << "S3.=" << &cseed[3] | |
3291 | << "S4.=" << &cseed[4] | |
3292 | << "S5.=" << &cseed[5] | |
980d5a2a | 3293 | << "FitterT.=" << tiltedRieman |
3294 | << "\n"; | |
41702fec | 3295 | } |
3296 | } // Loop: iter | |
68f9b6bd | 3297 | |
3298 | // we are sure that at least 4 tracklets are OK ! | |
3299 | return kTRUE; | |
e4f2f73d | 3300 | } |
3301 | ||
eb38ed55 | 3302 | //_________________________________________________________________________ |
68f9b6bd | 3303 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(Double_t *chi2){ |
41702fec | 3304 | // |
3305 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for | |
3306 | // the track selection | |
3307 | // The likelihood value containes: | |
3308 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit | |
3309 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets | |
3310 | // For all Parameters an exponential dependency is used | |
3311 | // | |
3312 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate | |
3313 | // - Array of chi2 values: | |
3314 | // * Non-Constrained Tilted Riemann fit | |
3315 | // * Vertex-Constrained Tilted Riemann fit | |
3316 | // * z-Direction from Linear fit | |
3317 | // Output: - The calculated track likelihood | |
3318 | // | |
3319 | // debug level 2 | |
3320 | // | |
41702fec | 3321 | |
68f9b6bd | 3322 | // Non-constrained Tilted Riemann |
3323 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); | |
3324 | // Constrained Tilted Riemann | |
3325 | Double_t likeChi2TC(1.); | |
3326 | if(chi2[1]>0.){ | |
3327 | likeChi2TC = TMath::Exp(-chi2[1] * 0.677); | |
3328 | Double_t r = likeChi2TC/likeChi2TR; | |
3329 | if(r>1.e2){;} // -> a primary track use TC | |
3330 | else if(r<1.e2) // -> a secondary track use TR | |
3331 | likeChi2TC =1.; | |
3332 | else{;} // -> test not conclusive | |
3333 | } | |
3334 | // Chi2 only on Z direction | |
3335 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); | |
3336 | // Chi2 angular resolution | |
3337 | Double_t likeChi2Phi= TMath::Exp(-chi2[3] * 3.23); | |
3338 | ||
3339 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2TC * likeChi2Phi; | |
3340 | ||
3341 | AliDebug(2, Form("Likelihood [%e]\n" | |
3342 | " Rieman : chi2[%f] likelihood[%6.2e]\n" | |
3343 | " Vertex : chi2[%f] likelihood[%6.2e]\n" | |
3344 | " Z : chi2[%f] likelihood[%6.2e]\n" | |
3345 | " Phi : chi2[%f] likelihood[%6.2e]" | |
3346 | , trackLikelihood | |
3347 | , chi2[0], likeChi2TR | |
3348 | , chi2[1], likeChi2TC | |
3349 | , chi2[2], likeChi2Z | |
3350 | , chi2[3], likeChi2Phi | |
3351 | )); | |
41702fec | 3352 | |
9e85cb05 | 3353 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
41702fec | 3354 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3355 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
a2fbb6ec | 3356 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec | 3357 | cstreamer << "CalculateTrackLikelihood0" |
3358 | << "EventNumber=" << eventNumber | |
3359 | << "CandidateNumber=" << candidateNumber | |
3360 | << "LikeChi2Z=" << likeChi2Z | |
3361 | << "LikeChi2TR=" << likeChi2TR | |
3362 | << "LikeChi2TC=" << likeChi2TC | |
f29f13a6 | 3363 | << "LikeChi2Phi=" << likeChi2Phi |
41702fec | 3364 | << "TrackLikelihood=" << trackLikelihood |
3365 | << "\n"; | |
3366 | } | |
6e39bde4 | 3367 | |
41702fec | 3368 | return trackLikelihood; |
e4f2f73d | 3369 | } |
3370 | ||
3371 | //____________________________________________________________________ | |
91834b8d | 3372 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]) |
e4f2f73d | 3373 | { |
41702fec | 3374 | // |
3375 | // Calculate the probability of this track candidate. | |
3376 | // | |
3377 | // Parameters : | |
3378 | // cseeds : array of candidate tracklets | |
3379 | // planes : array of seeding planes (see seeding configuration) | |
3380 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. | |
3381 | // | |
3382 | // Output : | |
3383 | // likelihood value | |
3384 | // | |
3385 | // Detailed description | |
3386 | // | |
3387 | // The track quality is estimated based on the following 4 criteria: | |
3388 | // 1. precision of the rieman fit on the Y direction (likea) | |
3389 | // 2. chi2 on the Y direction (likechi2y) | |
3390 | // 3. chi2 on the Z direction (likechi2z) | |
3391 | // 4. number of attached clusters compared to a reference value | |
3392 | // (see AliTRDrecoParam::fkFindable) (likeN) | |
3393 | // | |
3394 | // The distributions for each type of probabilities are given below as of | |
3395 | // (date). They have to be checked to assure consistency of estimation. | |
3396 | // | |
3397 | ||
3398 | // ratio of the total number of clusters/track which are expected to be found by the tracker. | |
91834b8d | 3399 | Double_t chi2y = GetChi2Y(&cseed[0]); |
3400 | Double_t chi2z = GetChi2Z(&cseed[0]); | |
3401 | ||
8ae98148 | 3402 | Float_t nclusters = 0.; |
41702fec | 3403 | Double_t sumda = 0.; |
3404 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ | |
3405 | Int_t jlayer = planes[ilayer]; | |
3406 | nclusters += cseed[jlayer].GetN2(); | |
e3cf3d02 | 3407 | sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1)); |
41702fec | 3408 | } |
8ae98148 | 3409 | nclusters *= .25; |
3410 | ||
9e85cb05 | 3411 | Double_t likea = TMath::Exp(-sumda * fkRecoParam->GetPhiSlope()); |
41702fec | 3412 | Double_t likechi2y = 0.0000000001; |
9e85cb05 | 3413 | if (fkReconstructor->IsCosmic() || chi2y < fkRecoParam->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fkRecoParam->GetChi2YSlope()); |
3414 | Double_t likechi2z = TMath::Exp(-chi2z * fkRecoParam->GetChi2ZSlope()); | |
3415 | Double_t likeN = TMath::Exp(-(fkRecoParam->GetNMeanClusters() - nclusters) / fkRecoParam->GetNSigmaClusters()); | |
41702fec | 3416 | Double_t like = likea * likechi2y * likechi2z * likeN; |
3417 | ||
9e85cb05 | 3418 | if(fkRecoParam->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
41702fec | 3419 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3420 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); | |
4d6aee34 | 3421 | Int_t nTracklets = 0; Float_t meanNcls = 0; |
91834b8d | 3422 | for(Int_t iseed=0; iseed < kNPlanes; iseed++){ |
3423 | if(!cseed[iseed].IsOK()) continue; | |
3424 | nTracklets++; | |
4d6aee34 | 3425 | meanNcls += cseed[iseed].GetN2(); |
91834b8d | 3426 | } |
4d6aee34 | 3427 | if(nTracklets) meanNcls /= nTracklets; |
41702fec | 3428 | // The Debug Stream contains the seed |
a2fbb6ec | 3429 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec | 3430 | cstreamer << "CookLikelihood" |
3431 | << "EventNumber=" << eventNumber | |
3432 | << "CandidateNumber=" << candidateNumber | |
3433 | << "tracklet0.=" << &cseed[0] | |
3434 | << "tracklet1.=" << &cseed[1] | |
3435 | << "tracklet2.=" << &cseed[2] | |
3436 | << "tracklet3.=" << &cseed[3] | |
3437 | << "tracklet4.=" << &cseed[4] | |
3438 | << "tracklet5.=" << &cseed[5] | |
3439 | << "sumda=" << sumda | |
91834b8d | 3440 | << "chi2y=" << chi2y |
3441 | << "chi2z=" << chi2z | |
41702fec | 3442 | << "likea=" << likea |
3443 | << "likechi2y=" << likechi2y | |
3444 | << "likechi2z=" << likechi2z | |
3445 | << "nclusters=" << nclusters | |
3446 | << "likeN=" << likeN | |
3447 | << "like=" << like | |
4d6aee34 | 3448 | << "meanncls=" << meanNcls |
41702fec | 3449 | << "\n"; |
3450 | } | |
3451 | ||
3452 | return like; | |
e4f2f73d | 3453 | } |
3454 | ||
e4f2f73d | 3455 | //____________________________________________________________________ |
0906e73e | 3456 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d | 3457 | { |
41702fec | 3458 | // |
3459 | // Map seeding configurations to detector planes. | |
3460 | // | |
3461 | // Parameters : | |
3462 | // iconfig : configuration index | |
3463 | // planes : member planes of this configuration. On input empty. | |
3464 | // | |
3465 | // Output : | |
3466 | // planes : contains the planes which are defining the configuration | |
3467 | // | |
3468 | // Detailed description | |
3469 | // | |
3470 | // Here is the list of seeding planes configurations together with | |
3471 | // their topological classification: | |
3472 | // | |
3473 | // 0 - 5432 TQ 0 | |
3474 | // 1 - 4321 TQ 0 | |
3475 | // 2 - 3210 TQ 0 | |
3476 | // 3 - 5321 TQ 1 | |
3477 | // 4 - 4210 TQ 1 | |
3478 | // 5 - 5431 TQ 1 | |
3479 | // 6 - 4320 TQ 1 | |
3480 | // 7 - 5430 TQ 2 | |
3481 | // 8 - 5210 TQ 2 | |
3482 | // 9 - 5421 TQ 3 | |
3483 | // 10 - 4310 TQ 3 | |
3484 | // 11 - 5410 TQ 4 | |
3485 | // 12 - 5420 TQ 5 | |
3486 | // 13 - 5320 TQ 5 | |
3487 | // 14 - 5310 TQ 5 | |
3488 | // | |
3489 | // The topologic quality is modeled as follows: | |
3490 | // 1. The general model is define by the equation: | |
3491 | // p(conf) = exp(-conf/2) | |
3492 | // 2. According to the topologic classification, configurations from the same | |
3493 | // class are assigned the agerage value over the model values. | |
3494 | // 3. Quality values are normalized. | |
3495 | // | |
3496 | // The topologic quality distribution as function of configuration is given below: | |
3497 | //Begin_Html | |
3498 | // <img src="gif/topologicQA.gif"> | |
3499 | //End_Html | |
3500 | // | |
3501 | ||
3502 | switch(iconfig){ | |
3503 | case 0: // 5432 TQ 0 | |
3504 | planes[0] = 2; | |
3505 | planes[1] = 3; | |
3506 | planes[2] = 4; | |
3507 | planes[3] = 5; | |
3508 | break; | |
3509 | case 1: // 4321 TQ 0 | |
3510 | planes[0] = 1; | |
3511 | planes[1] = 2; | |
3512 | planes[2] = 3; | |
3513 | planes[3] = 4; | |
3514 | break; | |
3515 | case 2: // 3210 TQ 0 | |
3516 | planes[0] = 0; | |
3517 | planes[1] = 1; | |
3518 | planes[2] = 2; | |
3519 | planes[3] = 3; | |
3520 | break; | |
3521 | case 3: // 5321 TQ 1 | |
3522 | planes[0] = 1; | |
3523 | planes[1] = 2; | |
3524 | planes[2] = 3; | |
3525 | planes[3] = 5; | |
3526 | break; | |
3527 | case 4: // 4210 TQ 1 | |
3528 | planes[0] = 0; | |
3529 | planes[1] = 1; | |
3530 | planes[2] = 2; | |
3531 | planes[3] = 4; | |
3532 | break; | |
3533 | case 5: // 5431 TQ 1 | |
3534 | planes[0] = 1; | |
3535 | planes[1] = 3; | |
3536 | planes[2] = 4; | |
3537 | planes[3] = 5; | |
3538 | break; | |
3539 | case 6: // 4320 TQ 1 | |
3540 | planes[0] = 0; | |
3541 | planes[1] = 2; | |
3542 | planes[2] = 3; | |
3543 | planes[3] = 4; | |
3544 | break; | |
3545 | case 7: // 5430 TQ 2 | |
3546 | planes[0] = 0; | |
3547 | planes[1] = 3; | |
3548 | planes[2] = 4; | |
3549 | planes[3] = 5; | |
3550 | break; | |
3551 | case 8: // 5210 TQ 2 | |
3552 | planes[0] = 0; | |
3553 | planes[1] = 1; | |
3554 | planes[2] = 2; | |
3555 | planes[3] = 5; | |
3556 | break; | |
3557 | case 9: // 5421 TQ 3 | |
3558 | planes[0] = 1; | |
3559 | planes[1] = 2; | |
3560 | planes[2] = 4; | |
3561 | planes[3] = 5; | |
3562 | break; | |
3563 | case 10: // 4310 TQ 3 | |
3564 | planes[0] = 0; | |
3565 | planes[1] = 1; | |
3566 | planes[2] = 3; | |
3567 | planes[3] = 4; | |
3568 | break; | |
3569 | case 11: // 5410 TQ 4 | |
3570 | planes[0] = 0; | |
3571 | planes[1] = 1; | |
3572 | planes[2] = 4; | |
3573 | planes[3] = 5; | |
3574 | break; | |
3575 | case 12: // 5420 TQ 5 | |
3576 | planes[0] = 0; | |
3577 | planes[1] = 2; | |
3578 | planes[2] = 4; | |
3579 | planes[3] = 5; | |
3580 | break; | |
3581 | case 13: // 5320 TQ 5 | |
3582 | planes[0] = 0; | |
3583 | planes[1] = 2; | |
3584 | planes[2] = 3; | |
3585 | planes[3] = 5; | |
3586 | break; | |
3587 | case 14: // 5310 TQ 5 | |
3588 | planes[0] = 0; | |
3589 | planes[1] = 1; | |
3590 | planes[2] = 3; | |
3591 | planes[3] = 5; | |
3592 | break; | |
3593 | } | |
e4f2f73d | 3594 | } |
3595 | ||
3596 | //____________________________________________________________________ | |
0906e73e | 3597 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d | 3598 | { |
41702fec | 3599 | // |
3600 | // Returns the extrapolation planes for a seeding configuration. | |
3601 | // | |
3602 | // Parameters : | |
3603 | // iconfig : configuration index | |
3604 | // planes : planes which are not in this configuration. On input empty. | |
3605 | // | |
3606 | // Output : | |
3607 | // planes : contains the planes which are not in the configuration | |
3608 | // | |
3609 | // Detailed description | |
3610 | // | |
3611 | ||
3612 | switch(iconfig){ | |
3613 | case 0: // 5432 TQ 0 | |
3614 | planes[0] = 1; | |
3615 | planes[1] = 0; | |
3616 | break; | |
3617 | case 1: // 4321 TQ 0 | |
3618 | planes[0] = 5; | |
3619 | planes[1] = 0; | |
3620 | break; | |
3621 | case 2: // 3210 TQ 0 | |
3622 | planes[0] = 4; | |
3623 | planes[1] = 5; | |
3624 | break; | |
3625 | case 3: // 5321 TQ 1 | |
3626 | planes[0] = 4; | |
3627 | planes[1] = 0; | |
3628 | break; | |
3629 | case 4: // 4210 TQ 1 | |
3630 | planes[0] = 5; | |
3631 | planes[1] = 3; | |
3632 | break; | |
3633 | case 5: // 5431 TQ 1 | |
3634 | planes[0] = 2; | |
3635 | planes[1] = 0; | |
3636 | break; | |
3637 | case 6: // 4320 TQ 1 | |
3638 | planes[0] = 5; | |
3639 | planes[1] = 1; | |
3640 | break; | |
3641 | case 7: // 5430 TQ 2 | |
3642 | planes[0] = 2; | |
3643 | planes[1] = 1; | |
3644 | break; | |
3645 | case 8: // 5210 TQ 2 | |
3646 | planes[0] = 4; | |
3647 | planes[1] = 3; | |
3648 | break; | |
3649 | case 9: // 5421 TQ 3 | |
3650 | planes[0] = 3; | |
3651 | planes[1] = 0; | |
3652 | break; | |
3653 | case 10: // 4310 TQ 3 | |
3654 | planes[0] = 5; | |
3655 | planes[1] = 2; | |
3656 | break; | |
3657 | case 11: // 5410 TQ 4 | |
3658 | planes[0] = 3; | |
3659 | planes[1] = 2; | |
3660 | break; | |
3661 | case 12: // 5420 TQ 5 | |
3662 | planes[0] = 3; | |
3663 | planes[1] = 1; | |
3664 | break; | |
3665 | case 13: // 5320 TQ 5 | |
3666 | planes[0] = 4; | |
3667 | planes[1] = 1; | |
3668 | break; | |
3669 | case 14: // 5310 TQ 5 | |
3670 | planes[0] = 4; | |
3671 | planes[1] = 2; | |
3672 | break; | |
3673 | } | |
e4f2f73d | 3674 | } |
eb38ed55 | 3675 | |
3676 | //____________________________________________________________________ | |
3677 | AliCluster* AliTRDtrackerV1::GetCluster(Int_t idx) const | |
3678 | { | |
971a356b | 3679 | if(!fClusters) return NULL; |
41702fec | 3680 | Int_t ncls = fClusters->GetEntriesFast(); |
4d6aee34 | 3681 | return idx >= 0 && idx < ncls ? (AliCluster*)fClusters->UncheckedAt(idx) : NULL; |
eb38ed55 | 3682 | } |
3683 | ||
3b57a3f7 | 3684 | //____________________________________________________________________ |
3685 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(Int_t idx) const | |
3686 | { | |
971a356b | 3687 | if(!fTracklets) return NULL; |
41702fec | 3688 | Int_t ntrklt = fTracklets->GetEntriesFast(); |
4d6aee34 | 3689 | return idx >= 0 && idx < ntrklt ? (AliTRDseedV1*)fTracklets->UncheckedAt(idx) : NULL; |
3b57a3f7 | 3690 | } |
3691 | ||
3692 | //____________________________________________________________________ | |
3693 | AliKalmanTrack* AliTRDtrackerV1::GetTrack(Int_t idx) const | |
3694 | { | |
971a356b | 3695 | if(!fTracks) return NULL; |
41702fec | 3696 | Int_t ntrk = fTracks->GetEntriesFast(); |
4d6aee34 | 3697 | return idx >= 0 && idx < ntrk ? (AliKalmanTrack*)fTracks->UncheckedAt(idx) : NULL; |
3b57a3f7 | 3698 | } |
3699 | ||
6e39bde4 | 3700 | |
eb38ed55 | 3701 | |
fac58f00 | 3702 | // //_____________________________________________________________________________ |
3703 | // Int_t AliTRDtrackerV1::Freq(Int_t n, const Int_t *inlist | |
3704 | // , Int_t *outlist, Bool_t down) | |
3705 | // { | |
3706 | // // | |
3707 | // // Sort eleements according occurancy | |
3708 | // // The size of output array has is 2*n | |
3709 | // // | |
3710 | // | |
3711 | // if (n <= 0) { | |
3712 | // return 0; | |
3713 | // } | |
3714 | // | |
3715 | // Int_t *sindexS = new Int_t[n]; // Temporary array for sorting | |
3716 | // Int_t *sindexF = new Int_t[2*n]; | |
3717 | // for (Int_t i = 0; i < n; i++) { | |
3718 | // sindexF[i] = 0; | |
3719 | // } | |
3720 | // | |
3721 | // TMath::Sort(n,inlist,sindexS,down); | |
3722 | // | |
3723 | // Int_t last = inlist[sindexS[0]]; | |
3724 | // Int_t val = last; | |
3725 | // sindexF[0] = 1; | |
3726 | // sindexF[0+n] = last; | |
3727 | // Int_t countPos = 0; | |
3728 | // | |
3729 | // // Find frequency | |
3730 | // for (Int_t i = 1; i < n; i++) { | |
3731 | // val = inlist[sindexS[i]]; | |
3732 | // if (last == val) { | |
3733 | // sindexF[countPos]++; | |
3734 | // } | |
3735 | // else { | |
3736 | // countPos++; | |
3737 | // sindexF[countPos+n] = val; | |
3738 | // sindexF[countPos]++; | |
3739 | // last = val; | |
3740 | // } | |
3741 | // } | |
3742 | // if (last == val) { | |
3743 | // countPos++; | |
3744 | // } | |
3745 | // | |
3746 | // // Sort according frequency | |
3747 | // TMath::Sort(countPos,sindexF,sindexS,kTRUE); | |
3748 | // | |
3749 | // for (Int_t i = 0; i < countPos; i++) { | |
3750 | // outlist[2*i ] = sindexF[sindexS[i]+n]; | |
3751 | // outlist[2*i+1] = sindexF[sindexS[i]]; | |
3752 | // } | |
3753 | // | |
3754 | // delete [] sindexS; | |
3755 | // delete [] sindexF; | |
3756 | // | |
3757 | // return countPos; | |
3758 | // | |
3759 | // } | |
bb56afff | 3760 | |
06b32d95 | 3761 | |
d611c74f | 3762 | //____________________________________________________________________ |
3763 | void AliTRDtrackerV1::ResetSeedTB() | |
3764 | { | |
3765 | // reset buffer for seeding time bin layers. If the time bin | |
3766 | // layers are not allocated this function allocates them | |
3767 | ||
3768 | for(Int_t isl=0; isl<kNSeedPlanes; isl++){ | |
3769 | if(!fSeedTB[isl]) fSeedTB[isl] = new AliTRDchamberTimeBin(); | |
3770 | else fSeedTB[isl]->Clear(); | |
3771 | } | |
3772 | } | |
3773 | ||
e3cf3d02 | 3774 | |
3775 | //_____________________________________________________________________________ | |
4d6aee34 | 3776 | Float_t AliTRDtrackerV1::GetChi2Y(const AliTRDseedV1 * const tracklets) const |
e3cf3d02 | 3777 | { |
3778 | // Calculates normalized chi2 in y-direction | |
3779 | // chi2 = Sum chi2 / n_tracklets | |
3780 | ||
3781 | Double_t chi2 = 0.; Int_t n = 0; | |
3782 | for(Int_t ipl = kNPlanes; ipl--;){ | |
3783 | if(!tracklets[ipl].IsOK()) continue; | |
3784 | chi2 += tracklets[ipl].GetChi2Y(); | |
3785 | n++; | |
3786 | } | |
3787 | return n ? chi2/n : 0.; | |
3788 | } | |
3789 | ||
bb56afff | 3790 | //_____________________________________________________________________________ |
4d6aee34 | 3791 | Float_t AliTRDtrackerV1::GetChi2Z(const AliTRDseedV1 *const tracklets) const |
bb56afff | 3792 | { |
91834b8d | 3793 | // Calculates normalized chi2 in z-direction |
e3cf3d02 | 3794 | // chi2 = Sum chi2 / n_tracklets |
41702fec | 3795 | |
e3cf3d02 | 3796 | Double_t chi2 = 0; Int_t n = 0; |
3797 | for(Int_t ipl = kNPlanes; ipl--;){ | |
41702fec | 3798 | if(!tracklets[ipl].IsOK()) continue; |
e3cf3d02 | 3799 | chi2 += tracklets[ipl].GetChi2Z(); |
3800 | n++; | |
41702fec | 3801 | } |
e3cf3d02 | 3802 | return n ? chi2/n : 0.; |
bb56afff | 3803 | } |
8acca6a3 | 3804 | |
68f9b6bd | 3805 | //_____________________________________________________________________________ |
3806 | Float_t AliTRDtrackerV1::GetChi2Phi(const AliTRDseedV1 *const tracklets) const | |
3807 | { | |
3808 | // Calculates normalized chi2 for angular resolution | |
3809 | // chi2 = Sum chi2 / n_tracklets | |
3810 | ||
3811 | Double_t chi2 = 0; Int_t n = 0; | |
3812 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
3813 | if(!tracklets[iLayer].IsOK()) continue; | |
3814 | chi2 += tracklets[iLayer].GetChi2Phi(); | |
3815 | n++; | |
3816 | } | |
3817 | return n ? chi2/n: 0.; | |
3818 | } | |
3819 | ||
6e39bde4 | 3820 | //____________________________________________________________________ |
4d6aee34 | 3821 | Float_t AliTRDtrackerV1::CalculateReferenceX(const AliTRDseedV1 *const tracklets){ |
6e39bde4 | 3822 | // |
3823 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
3824 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
3825 | // are taken into account | |
3826 | // | |
3827 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
3828 | // | |
3829 | // Output: - The reference x-position(Float_t) | |
3830 | // Only kept for compatibility with the old code | |
3831 | // | |
3832 | Int_t nDistances = 0; | |
3833 | Float_t meanDistance = 0.; | |
3834 | Int_t startIndex = 5; | |
3835 | for(Int_t il =5; il > 0; il--){ | |
3836 | if(tracklets[il].IsOK() && tracklets[il -1].IsOK()){ | |
3837 | Float_t xdiff = tracklets[il].GetX0() - tracklets[il -1].GetX0(); | |
3838 | meanDistance += xdiff; | |
3839 | nDistances++; | |
3840 | } | |
3841 | if(tracklets[il].IsOK()) startIndex = il; | |
3842 | } | |
3843 | if(tracklets[0].IsOK()) startIndex = 0; | |
3844 | if(!nDistances){ | |
3845 | // We should normally never get here | |
3846 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
3847 | Int_t iok = 0, idiff = 0; | |
3848 | // This attempt is worse and should be avoided: | |
3849 | // check for two chambers which are OK and repeat this without taking the mean value | |
3850 | // Strategy avoids a division by 0; | |
3851 | for(Int_t il = 5; il >= 0; il--){ | |
3852 | if(tracklets[il].IsOK()){ | |
3853 | xpos[iok] = tracklets[il].GetX0(); | |
3854 | iok++; | |
3855 | startIndex = il; | |
3856 | } | |
3857 | if(iok) idiff++; // to get the right difference; | |
3858 | if(iok > 1) break; | |
3859 | } | |
3860 | if(iok > 1){ | |
3861 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
3862 | } | |
3863 | else{ | |
3864 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
3865 | return 331.; | |
3866 | } | |
3867 | } | |
3868 | else{ | |
3869 | meanDistance /= nDistances; | |
3870 | } | |
3871 | return tracklets[startIndex].GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
3872 | } | |
3873 | ||
3874 | //_____________________________________________________________________________ | |
4d6aee34 | 3875 | Double_t AliTRDtrackerV1::FitTiltedRiemanV1(AliTRDseedV1 *const tracklets){ |
6e39bde4 | 3876 | // |
3877 | // Track Fitter Function using the new class implementation of | |
3878 | // the Rieman fit | |
3879 | // | |
3880 | AliTRDtrackFitterRieman fitter; | |
3881 | fitter.SetRiemanFitter(GetTiltedRiemanFitter()); | |
3882 | fitter.Reset(); | |
3883 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) fitter.SetTracklet(il, &tracklets[il]); | |
3884 | Double_t chi2 = fitter.Eval(); | |
3885 | // Update the tracklets | |
3886 | Double_t cov[15]; Double_t x0; | |
3887 | memset(cov, 0, sizeof(Double_t) * 15); | |
3888 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++){ | |
3889 | x0 = tracklets[il].GetX0(); | |
3890 | tracklets[il].SetYref(0, fitter.GetYat(x0)); | |
3891 | tracklets[il].SetZref(0, fitter.GetZat(x0)); | |
3892 | tracklets[il].SetYref(1, fitter.GetDyDxAt(x0)); | |
3893 | tracklets[il].SetZref(1, fitter.GetDzDx()); | |
3894 | tracklets[il].SetC(fitter.GetCurvature()); | |
3895 | fitter.GetCovAt(x0, cov); | |
3896 | tracklets[il].SetCovRef(cov); | |
3897 | tracklets[il].SetChi2(chi2); | |
3898 | } | |
3899 | return chi2; | |
3900 | } | |
3901 | ||
68f9b6bd | 3902 | //____________________________________________________________________ |
3903 | void AliTRDtrackerV1::UnsetTrackletsTrack(const AliTRDtrackV1 * const track) | |
3904 | { | |
d8069611 | 3905 | // Remove tracklets from tracker list attached to "track" |
68f9b6bd | 3906 | Int_t idx(-1); |
3907 | for(Int_t il(0); il<kNPlanes; il++){ | |
3908 | if((idx = track->GetTrackletIndex(il)) < 0) continue; | |
3909 | delete (fTracklets->RemoveAt(idx)); | |
3910 | } | |
3911 | } | |
3912 | ||
3913 | ||
8acca6a3 | 3914 | /////////////////////////////////////////////////////// |
3915 | // // | |
3916 | // Resources of class AliTRDLeastSquare // | |
3917 | // // | |
3918 | /////////////////////////////////////////////////////// | |
3919 | ||
3920 | //_____________________________________________________________________________ | |
3921 | AliTRDtrackerV1::AliTRDLeastSquare::AliTRDLeastSquare(){ | |
903326c1 | 3922 | // |
3923 | // Constructor of the nested class AliTRDtrackFitterLeastSquare | |
3924 | // | |
3925 | // Fast solving linear regresion in 2D | |
0323ef61 | 3926 | // y=a + bx |
903326c1 | 3927 | // The data members have the following meaning |
0323ef61 | 3928 | // fParams[0] : a |
3929 | // fParams[1] : b | |
903326c1 | 3930 | // |
3931 | // fSums[0] : S | |
3932 | // fSums[1] : Sx | |
3933 | // fSums[2] : Sy | |
3934 | // fSums[3] : Sxy | |
3935 | // fSums[4] : Sxx | |
3936 | // fSums[5] : Syy | |
3937 | // | |
0323ef61 | 3938 | // fCovarianceMatrix[0] : s2a |
3939 | // fCovarianceMatrix[1] : s2b | |
903326c1 | 3940 | // fCovarianceMatrix[2] : cov(ab) |
3941 | ||
41702fec | 3942 | memset(fParams, 0, sizeof(Double_t) * 2); |
341512a4 | 3943 | memset(fSums, 0, sizeof(Double_t) * 6); |
41702fec | 3944 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); |
8acca6a3 | 3945 | |
3946 | } | |
3947 | ||
3948 | //_____________________________________________________________________________ | |
4d6aee34 | 3949 | void AliTRDtrackerV1::AliTRDLeastSquare::AddPoint(const Double_t *const x, Double_t y, Double_t sigmaY){ |
41702fec | 3950 | // |
3951 | // Adding Point to the fitter | |
3952 | // | |
5f1ae1e7 | 3953 | |
2ed81ab2 | 3954 | Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9); |
3955 | weight *= weight; | |
4d6aee34 | 3956 | const Double_t &xpt = *x; |
41702fec | 3957 | // printf("Adding point x = %f, y = %f, sigma = %f\n", xpt, y, sigmaY); |
3958 | fSums[0] += weight; | |
3959 | fSums[1] += weight * xpt; | |
3960 | fSums[2] += weight * y; | |
3961 | fSums[3] += weight * xpt * y; | |
3962 | fSums[4] += weight * xpt * xpt; | |
3963 | fSums[5] += weight * y * y; | |
8acca6a3 | 3964 | } |
3965 | ||
3966 | //_____________________________________________________________________________ | |
4d6aee34 | 3967 | void AliTRDtrackerV1::AliTRDLeastSquare::RemovePoint(const Double_t *const x, Double_t y, Double_t sigmaY){ |
41702fec | 3968 | // |
3969 | // Remove Point from the sample | |
3970 | // | |
5f1ae1e7 | 3971 | |
2ed81ab2 | 3972 | Double_t weight = 1/(sigmaY > 1e-9 ? sigmaY : 1e-9); |
3973 | weight *= weight; | |
4d6aee34 | 3974 | const Double_t &xpt = *x; |
41702fec | 3975 | fSums[0] -= weight; |
3976 | fSums[1] -= weight * xpt; | |
3977 | fSums[2] -= weight * y; | |
3978 | fSums[3] -= weight * xpt * y; | |
3979 | fSums[4] -= weight * xpt * xpt; | |
3980 | fSums[5] -= weight * y * y; | |
8acca6a3 | 3981 | } |
3982 | ||
3983 | //_____________________________________________________________________________ | |
903326c1 | 3984 | Bool_t AliTRDtrackerV1::AliTRDLeastSquare::Eval(){ |
41702fec | 3985 | // |
3986 | // Evaluation of the fit: | |
3987 | // Calculation of the parameters | |
3988 | // Calculation of the covariance matrix | |
3989 | // | |
3990 | ||
903326c1 | 3991 | Double_t det = fSums[0] * fSums[4] - fSums[1] *fSums[1]; |
d8069611 | 3992 | if(TMath::Abs(det)<1.e-30) return kFALSE; |
aec26713 | 3993 | |
41702fec | 3994 | // for(Int_t isum = 0; isum < 5; isum++) |
3995 | // printf("fSums[%d] = %f\n", isum, fSums[isum]); | |
3996 | // printf("denominator = %f\n", denominator); | |
903326c1 | 3997 | fParams[0] = (fSums[2] * fSums[4] - fSums[1] * fSums[3])/det; |
3998 | fParams[1] = (fSums[0] * fSums[3] - fSums[1] * fSums[2])/det; | |
41702fec | 3999 | // printf("fParams[0] = %f, fParams[1] = %f\n", fParams[0], fParams[1]); |
4000 | ||
4001 | // Covariance matrix | |
0323ef61 | 4002 | Double_t den = fSums[0]*fSums[4] - fSums[1]*fSums[1]; |
4003 | fCovarianceMatrix[0] = fSums[4] / den; | |
4004 | fCovarianceMatrix[1] = fSums[0] / den; | |
4005 | fCovarianceMatrix[2] = -fSums[1] / den; | |
4006 | /* fCovarianceMatrix[0] = fSums[4] / fSums[0] - fSums[1] * fSums[1] / (fSums[0] * fSums[0]); | |
2ed81ab2 | 4007 | fCovarianceMatrix[1] = fSums[5] / fSums[0] - fSums[2] * fSums[2] / (fSums[0] * fSums[0]); |
0323ef61 | 4008 | fCovarianceMatrix[2] = fSums[3] / fSums[0] - fSums[1] * fSums[2] / (fSums[0] * fSums[0]);*/ |
4009 | ||
4010 | ||
4011 | ||
903326c1 | 4012 | return kTRUE; |
8acca6a3 | 4013 | } |
4014 | ||
46b6abd7 | 4015 | //_____________________________________________________________________________ |
4d6aee34 | 4016 | Double_t AliTRDtrackerV1::AliTRDLeastSquare::GetFunctionValue(const Double_t *const xpos) const { |
41702fec | 4017 | // |
4018 | // Returns the Function value of the fitted function at a given x-position | |
4019 | // | |
4020 | return fParams[0] + fParams[1] * (*xpos); | |
46b6abd7 | 4021 | } |
4022 | ||
4023 | //_____________________________________________________________________________ | |
4024 | void AliTRDtrackerV1::AliTRDLeastSquare::GetCovarianceMatrix(Double_t *storage) const { | |
41702fec | 4025 | // |
4026 | // Copies the values of the covariance matrix into the storage | |
4027 | // | |
4028 | memcpy(storage, fCovarianceMatrix, sizeof(Double_t) * 3); | |
46b6abd7 | 4029 | } |
4030 | ||
6e39bde4 | 4031 | //_____________________________________________________________________________ |
4032 | void AliTRDtrackerV1::AliTRDLeastSquare::Reset(){ | |
4033 | // | |
4034 | // Reset the fitter | |
4035 | // | |
4036 | memset(fParams, 0, sizeof(Double_t) * 2); | |
4037 | memset(fCovarianceMatrix, 0, sizeof(Double_t) * 3); | |
4038 | memset(fSums, 0, sizeof(Double_t) * 6); | |
4039 | } | |
4040 | ||
4041 | /////////////////////////////////////////////////////// | |
4042 | // // | |
4043 | // Resources of class AliTRDtrackFitterRieman // | |
4044 | // // | |
4045 | /////////////////////////////////////////////////////// | |
4046 | ||
4047 | //_____________________________________________________________________________ | |
4048 | AliTRDtrackerV1::AliTRDtrackFitterRieman::AliTRDtrackFitterRieman(): | |
4049 | fTrackFitter(NULL), | |
4050 | fZfitter(NULL), | |
4051 | fCovarPolY(NULL), | |
4052 | fCovarPolZ(NULL), | |
4053 | fXref(0.), | |
4054 | fSysClusterError(0.) | |
4055 | { | |
4056 | // | |
4057 | // Default constructor | |
4058 | // | |
4059 | fZfitter = new AliTRDLeastSquare; | |
4060 | fCovarPolY = new TMatrixD(3,3); | |
4061 | fCovarPolZ = new TMatrixD(2,2); | |
4062 | memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * 6); | |
4063 | memset(fParameters, 0, sizeof(Double_t) * 5); | |
4064 | memset(fSumPolY, 0, sizeof(Double_t) * 5); | |
4065 | memset(fSumPolZ, 0, sizeof(Double_t) * 2); | |
4066 | } | |
4067 | ||
4068 | //_____________________________________________________________________________ | |
4069 | AliTRDtrackerV1::AliTRDtrackFitterRieman::~AliTRDtrackFitterRieman(){ | |
4070 | // | |
4071 | // Destructor | |
4072 | // | |
4073 | if(fZfitter) delete fZfitter; | |
4074 | if(fCovarPolY) delete fCovarPolY; | |
4075 | if(fCovarPolZ) delete fCovarPolZ; | |
4076 | } | |
4077 | ||
4078 | //_____________________________________________________________________________ | |
4079 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::Reset(){ | |
4080 | // | |
4081 | // Reset the Fitter | |
4082 | // | |
4083 | if(fTrackFitter){ | |
4084 | fTrackFitter->StoreData(kTRUE); | |
4085 | fTrackFitter->ClearPoints(); | |
4086 | } | |
4087 | if(fZfitter){ | |
4088 | fZfitter->Reset(); | |
4089 | } | |
4090 | fXref = 0.; | |
4091 | memset(fTracklets, 0, sizeof(AliTRDseedV1 *) * AliTRDgeometry::kNlayer); | |
4092 | memset(fParameters, 0, sizeof(Double_t) * 5); | |
4093 | memset(fSumPolY, 0, sizeof(Double_t) * 5); | |
4094 | memset(fSumPolZ, 0, sizeof(Double_t) * 2); | |
4095 | for(Int_t irow = 0; irow < fCovarPolY->GetNrows(); irow++) | |
4096 | for(Int_t icol = 0; icol < fCovarPolY->GetNcols(); icol++){ | |
4097 | (*fCovarPolY)(irow, icol) = 0.; | |
4098 | if(irow < 2 && icol < 2) | |
4099 | (*fCovarPolZ)(irow, icol) = 0.; | |
4100 | } | |
4101 | } | |
4102 | ||
4103 | //_____________________________________________________________________________ | |
4104 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::SetTracklet(Int_t itr, AliTRDseedV1 *tracklet){ | |
4105 | // | |
4106 | // Add tracklet into the fitter | |
4107 | // | |
4108 | if(itr >= AliTRDgeometry::kNlayer) return; | |
4109 | fTracklets[itr] = tracklet; | |
4110 | } | |
4111 | ||
4112 | //_____________________________________________________________________________ | |
4113 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::Eval(){ | |
4114 | // | |
4115 | // Perform the fit | |
4116 | // 1. Apply linear transformation and store points in the fitter | |
4117 | // 2. Evaluate the fit | |
4118 | // 3. Check if the result of the fit in z-direction is reasonable | |
4119 | // if not | |
4120 | // 3a. Fix the parameters 3 and 4 with the results of a simple least | |
4121 | // square fit | |
4122 | // 3b. Redo the fit with the fixed parameters | |
4123 | // 4. Store fit results (parameters and errors) | |
4124 | // | |
4125 | if(!fTrackFitter){ | |
4126 | return 1e10; | |
4127 | } | |
4128 | fXref = CalculateReferenceX(); | |
4129 | for(Int_t il = 0; il < AliTRDgeometry::kNlayer; il++) UpdateFitters(fTracklets[il]); | |
4130 | if(!fTrackFitter->GetNpoints()) return 1e10; | |
4131 | // perform the fit | |
4132 | fTrackFitter->Eval(); | |
4133 | fZfitter->Eval(); | |
4134 | fParameters[3] = fTrackFitter->GetParameter(3); | |
4135 | fParameters[4] = fTrackFitter->GetParameter(4); | |
4136 | if(!CheckAcceptable(fParameters[3], fParameters[4])) { | |
4137 | fTrackFitter->FixParameter(3, fZfitter->GetFunctionValue(&fXref)); | |
4138 | fTrackFitter->FixParameter(4, fZfitter->GetFunctionParameter(1)); | |
4139 | fTrackFitter->Eval(); | |
4140 | fTrackFitter->ReleaseParameter(3); | |
4141 | fTrackFitter->ReleaseParameter(4); | |
4142 | fParameters[3] = fTrackFitter->GetParameter(3); | |
4143 | fParameters[4] = fTrackFitter->GetParameter(4); | |
4144 | } | |
4145 | // Update the Fit Parameters and the errors | |
4146 | fParameters[0] = fTrackFitter->GetParameter(0); | |
4147 | fParameters[1] = fTrackFitter->GetParameter(1); | |
4148 | fParameters[2] = fTrackFitter->GetParameter(2); | |
4149 | ||
4150 | // Prepare Covariance estimation | |
4151 | (*fCovarPolY)(0,0) = fSumPolY[0]; (*fCovarPolY)(1,1) = fSumPolY[2]; (*fCovarPolY)(2,2) = fSumPolY[4]; | |
4152 | (*fCovarPolY)(1,0) = (*fCovarPolY)(0,1) = fSumPolY[1]; | |
4153 | (*fCovarPolY)(2,0) = (*fCovarPolY)(0,2) = fSumPolY[2]; | |
4154 | (*fCovarPolY)(2,1) = (*fCovarPolY)(1,2) = fSumPolY[3]; | |
4155 | fCovarPolY->Invert(); | |
4156 | (*fCovarPolZ)(0,0) = fSumPolZ[0]; (*fCovarPolZ)(1,1) = fSumPolZ[2]; | |
4157 | (*fCovarPolZ)(1,0) = (*fCovarPolZ)(0,1) = fSumPolZ[1]; | |
4158 | fCovarPolZ->Invert(); | |
4159 | return fTrackFitter->GetChisquare() / fTrackFitter->GetNpoints(); | |
4160 | } | |
4161 | ||
4162 | //_____________________________________________________________________________ | |
33ab3872 | 4163 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::UpdateFitters(const AliTRDseedV1 * const tracklet){ |
6e39bde4 | 4164 | // |
4165 | // Does the transformations and updates the fitters | |
4166 | // The following transformation is applied | |
4167 | // | |
4168 | AliTRDcluster *cl = NULL; | |
4169 | Double_t x, y, z, dx, t, w, we, yerr, zerr; | |
4170 | Double_t uvt[4]; | |
4171 | if(!tracklet || !tracklet->IsOK()) return; | |
4172 | Double_t tilt = tracklet->GetTilt(); | |
4173 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ | |
4174 | if(!(cl = tracklet->GetClusters(itb))) continue; | |
4175 | if(!cl->IsInChamber()) continue; | |
4176 | if (!tracklet->IsUsable(itb)) continue; | |
4177 | x = cl->GetX(); | |
4178 | y = cl->GetY(); | |
4179 | z = cl->GetZ(); | |
4180 | dx = x - fXref; | |
4181 | // Transformation | |
4182 | t = 1./(x*x + y*y); | |
4183 | uvt[0] = 2. * x * t; | |
4184 | uvt[1] = t; | |
4185 | uvt[2] = 2. * tilt * t; | |
4186 | uvt[3] = 2. * tilt * dx * t; | |
4187 | w = 2. * (y + tilt*z) * t; | |
4188 | // error definition changes for the different calls | |
4189 | we = 2. * t; | |
4190 | we *= TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()); | |
4191 | // Update sums for error calculation | |
4192 | yerr = 1./(TMath::Sqrt(cl->GetSigmaY2()) + fSysClusterError); | |
4193 | yerr *= yerr; | |
4194 | zerr = 1./cl->GetSigmaZ2(); | |
4195 | for(Int_t ipol = 0; ipol < 5; ipol++){ | |
4196 | fSumPolY[ipol] += yerr; | |
4197 | yerr *= x; | |
4198 | if(ipol < 3){ | |
4199 | fSumPolZ[ipol] += zerr; | |
4200 | zerr *= x; | |
4201 | } | |
4202 | } | |
4203 | fTrackFitter->AddPoint(uvt, w, we); | |
4204 | fZfitter->AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); | |
4205 | } | |
4206 | } | |
4207 | ||
4208 | //_____________________________________________________________________________ | |
4209 | Bool_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CheckAcceptable(Double_t offset, Double_t slope){ | |
4210 | // | |
4211 | // Check whether z-results are acceptable | |
4212 | // Definition: Distance between tracklet fit and track fit has to be | |
4213 | // less then half a padlength | |
4214 | // Point of comparision is at the anode wire | |
4215 | // | |
4216 | Bool_t acceptablez = kTRUE; | |
4217 | Double_t zref = 0.0; | |
4218 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { | |
4219 | if(!fTracklets[iLayer]->IsOK()) continue; | |
4220 | zref = offset + slope * (fTracklets[iLayer]->GetX0() - fXref); | |
4221 | if (TMath::Abs(fTracklets[iLayer]->GetZfit(0) - zref) > fTracklets[iLayer]->GetPadLength() * 0.5 + 1.0) | |
4222 | acceptablez = kFALSE; | |
4223 | } | |
4224 | return acceptablez; | |
4225 | } | |
4226 | ||
4227 | //_____________________________________________________________________________ | |
4228 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetYat(Double_t x) const { | |
4229 | // | |
4230 | // Calculate y position out of the track parameters | |
4231 | // y: R^2 = (x - x0)^2 + (y - y0)^2 | |
4232 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) | |
4233 | // R = Sqrt() = 1/Curvature | |
4234 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) | |
4235 | // | |
4236 | Double_t y = 0; | |
4237 | Double_t disc = (x * fParameters[0] + fParameters[1]); | |
4238 | disc = 1 - fParameters[0]*fParameters[2] + fParameters[1]*fParameters[1] - disc*disc; | |
4239 | if (disc >= 0) { | |
4240 | disc = TMath::Sqrt(disc); | |
4241 | y = (1.0 - disc) / fParameters[0]; | |
4242 | } | |
4243 | return y; | |
4244 | } | |
4245 | ||
4246 | //_____________________________________________________________________________ | |
4247 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetZat(Double_t x) const { | |
4248 | // | |
4249 | // Return z position for a given x position | |
4250 | // Simple linear function | |
4251 | // | |
4252 | return fParameters[3] + fParameters[4] * (x - fXref); | |
4253 | } | |
4254 | ||
4255 | //_____________________________________________________________________________ | |
4256 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetDyDxAt(Double_t x) const { | |
4257 | // | |
4258 | // Calculate dydx at a given radial position out of the track parameters | |
4259 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 | |
4260 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 | |
4261 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) | |
4262 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) | |
4263 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) | |
4264 | // | |
4265 | Double_t x0 = -fParameters[1] / fParameters[0]; | |
4266 | Double_t curvature = GetCurvature(); | |
4267 | Double_t dy = 0; | |
4268 | if (-fParameters[2] * fParameters[0] + fParameters[1] * fParameters[1] + 1 > 0) { | |
4269 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { | |
4270 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); | |
4271 | if (fParameters[0] < 0) yderiv *= -1.0; | |
4272 | dy = yderiv; | |
4273 | } | |
4274 | } | |
4275 | return dy; | |
4276 | } | |
4277 | ||
4278 | //_____________________________________________________________________________ | |
4279 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCurvature() const { | |
4280 | // | |
4281 | // Calculate track curvature | |
4282 | // | |
4283 | // | |
4284 | Double_t curvature = 1.0 + fParameters[1]*fParameters[1] - fParameters[2]*fParameters[0]; | |
4285 | if (curvature > 0.0) | |
4286 | curvature = fParameters[0] / TMath::Sqrt(curvature); | |
4287 | return curvature; | |
4288 | } | |
4289 | ||
4290 | //_____________________________________________________________________________ | |
4291 | void AliTRDtrackerV1::AliTRDtrackFitterRieman::GetCovAt(Double_t x, Double_t *cov) const { | |
4292 | // | |
4293 | // Error Definition according to gauss error propagation | |
4294 | // | |
4295 | TMatrixD transform(3,3); | |
4296 | transform(0,0) = transform(1,1) = transform(2,2) = 1; | |
4297 | transform(0,1) = transform(1,2) = x; | |
4298 | transform(0,2) = x*x; | |
4299 | TMatrixD covariance(transform, TMatrixD::kMult, *fCovarPolY); | |
4300 | covariance *= transform.T(); | |
4301 | cov[0] = covariance(0,0); | |
4302 | TMatrixD transformZ(2,2); | |
4303 | transformZ(0,0) = transformZ(1,1) = 1; | |
4304 | transformZ(0,1) = x; | |
4305 | TMatrixD covarZ(transformZ, TMatrixD::kMult, *fCovarPolZ); | |
4306 | covarZ *= transformZ.T(); | |
4307 | cov[1] = covarZ(0,0); | |
4308 | cov[2] = 0; | |
4309 | } | |
4310 | ||
4311 | //____________________________________________________________________ | |
4312 | Double_t AliTRDtrackerV1::AliTRDtrackFitterRieman::CalculateReferenceX(){ | |
4313 | // | |
4314 | // Calculates the reference x-position for the tilted Rieman fit defined as middle | |
4315 | // of the stack (middle between layers 2 and 3). For the calculation all the tracklets | |
4316 | // are taken into account | |
4317 | // | |
4318 | // Parameters: - Array of tracklets(AliTRDseedV1) | |
4319 | // | |
4320 | // Output: - The reference x-position(Float_t) | |
4321 | // | |
4322 | Int_t nDistances = 0; | |
4323 | Float_t meanDistance = 0.; | |
4324 | Int_t startIndex = 5; | |
4325 | for(Int_t il =5; il > 0; il--){ | |
4326 | if(fTracklets[il]->IsOK() && fTracklets[il -1]->IsOK()){ | |
4327 | Float_t xdiff = fTracklets[il]->GetX0() - fTracklets[il -1]->GetX0(); | |
4328 | meanDistance += xdiff; | |
4329 | nDistances++; | |
4330 | } | |
4331 | if(fTracklets[il]->IsOK()) startIndex = il; | |
4332 | } | |
4333 | if(fTracklets[0]->IsOK()) startIndex = 0; | |
4334 | if(!nDistances){ | |
4335 | // We should normally never get here | |
4336 | Float_t xpos[2]; memset(xpos, 0, sizeof(Float_t) * 2); | |
4337 | Int_t iok = 0, idiff = 0; | |
4338 | // This attempt is worse and should be avoided: | |
4339 | // check for two chambers which are OK and repeat this without taking the mean value | |
4340 | // Strategy avoids a division by 0; | |
4341 | for(Int_t il = 5; il >= 0; il--){ | |
4342 | if(fTracklets[il]->IsOK()){ | |
4343 | xpos[iok] = fTracklets[il]->GetX0(); | |
4344 | iok++; | |
4345 | startIndex = il; | |
4346 | } | |
4347 | if(iok) idiff++; // to get the right difference; | |
4348 | if(iok > 1) break; | |
4349 | } | |
4350 | if(iok > 1){ | |
4351 | meanDistance = (xpos[0] - xpos[1])/idiff; | |
4352 | } | |
4353 | else{ | |
4354 | // we have do not even have 2 layers which are OK? The we do not need to fit at all | |
4355 | return 331.; | |
4356 | } | |
4357 | } | |
4358 | else{ | |
4359 | meanDistance /= nDistances; | |
4360 | } | |
4361 | return fTracklets[startIndex]->GetX0() + (2.5 - startIndex) * meanDistance - 0.5 * (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
4362 | } |