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1 | /************************************************************************** |
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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 | **************************************************************************/ |
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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 | |
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28 | #include <TBranch.h> |
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29 | #include <TDirectory.h> |
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30 | #include <TLinearFitter.h> |
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31 | #include <TTree.h> |
32 | #include <TClonesArray.h> |
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33 | #include <TTreeStream.h> |
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34 | #include <TGeoMatrix.h> |
35 | #include <TGeoManager.h> |
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36 | |
37 | #include "AliLog.h" |
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38 | #include "AliMathBase.h" |
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39 | #include "AliESDEvent.h" |
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40 | #include "AliGeomManager.h" |
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41 | #include "AliRieman.h" |
42 | #include "AliTrackPointArray.h" |
43 | |
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44 | #include "AliTRDgeometry.h" |
45 | #include "AliTRDpadPlane.h" |
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46 | #include "AliTRDcalibDB.h" |
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47 | #include "AliTRDReconstructor.h" |
48 | #include "AliTRDCalibraFillHisto.h" |
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49 | #include "AliTRDrecoParam.h" |
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50 | |
51 | #include "AliTRDcluster.h" |
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52 | #include "AliTRDseedV1.h" |
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53 | #include "AliTRDtrackV1.h" |
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54 | #include "AliTRDtrackerV1.h" |
55 | #include "AliTRDtrackerDebug.h" |
56 | #include "AliTRDtrackingChamber.h" |
57 | #include "AliTRDchamberTimeBin.h" |
58 | |
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59 | ClassImp(AliTRDtrackerV1) |
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60 | |
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61 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // |
62 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // |
63 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // |
64 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle |
65 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation |
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66 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
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67 | 0.5112, 0.5112, 0.5112, 0.0786, 0.0786, |
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68 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, |
69 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 |
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70 | }; |
71 | const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = { |
72 | 300.2, 312.8, 325.4, 338.0, 350.6, 363.2}; |
2985ffcb |
73 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
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74 | AliRieman* AliTRDtrackerV1::fgRieman = NULL; |
75 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = NULL; |
76 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = NULL; |
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77 | |
78 | //____________________________________________________________________ |
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79 | AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec) |
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80 | :AliTracker() |
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81 | ,fkReconstructor(NULL) |
82 | ,fGeom(NULL) |
83 | ,fClusters(NULL) |
84 | ,fTracklets(NULL) |
85 | ,fTracks(NULL) |
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86 | ,fSieveSeeding(0) |
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87 | { |
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88 | // |
89 | // Default constructor. |
90 | // |
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91 | |
92 | SetReconstructor(rec); // initialize reconstructor |
93 | |
94 | // initialize geometry |
95 | if(!AliGeomManager::GetGeometry()){ |
96 | AliFatal("Could not get geometry."); |
97 | } |
98 | fGeom = new AliTRDgeometry(); |
99 | fGeom->CreateClusterMatrixArray(); |
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100 | TGeoHMatrix *matrix = NULL; |
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101 | Double_t loc[] = {0., 0., 0.}; |
102 | Double_t glb[] = {0., 0., 0.}; |
103 | for(Int_t ily=kNPlanes; ily--;){ |
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104 | Int_t ism = 0; |
105 | while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++; |
106 | if(!matrix){ |
107 | AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily)); |
108 | fR[ily] = fgkX0[ily]; |
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109 | continue; |
110 | } |
111 | matrix->LocalToMaster(loc, glb); |
112 | fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); |
113 | } |
114 | |
115 | // initialize calibration values |
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116 | AliTRDcalibDB *trd = NULL; |
a7ac01d2 |
117 | if (!(trd = AliTRDcalibDB::Instance())) { |
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118 | AliFatal("Could not get calibration."); |
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119 | } |
a7ac01d2 |
120 | if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins(); |
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121 | |
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122 | // initialize cluster containers |
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123 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
3a039a31 |
124 | |
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125 | // initialize arrays |
126 | memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t)); |
127 | memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t)); |
128 | memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*)); |
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129 | } |
130 | |
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131 | //____________________________________________________________________ |
132 | AliTRDtrackerV1::~AliTRDtrackerV1() |
133 | { |
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134 | // |
135 | // Destructor |
136 | // |
137 | |
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138 | if(fgRieman) delete fgRieman; fgRieman = NULL; |
139 | if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = NULL; |
140 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = NULL; |
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141 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl]; |
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142 | if(fTracks) {fTracks->Delete(); delete fTracks;} |
143 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} |
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144 | if(fClusters) { |
145 | fClusters->Delete(); delete fClusters; |
146 | } |
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147 | if(fGeom) delete fGeom; |
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148 | } |
149 | |
150 | //____________________________________________________________________ |
151 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) |
152 | { |
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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 | |
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168 | if(!fkReconstructor->GetRecoParam() ){ |
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169 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); |
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170 | return 0; |
171 | } |
172 | |
173 | //AliInfo("Start Track Finder ..."); |
174 | Int_t ntracks = 0; |
053767a4 |
175 | for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){ |
41702fec |
176 | // for(int ism=1; ism<2; ism++){ |
177 | //AliInfo(Form("Processing supermodule %i ...", ism)); |
178 | ntracks += Clusters2TracksSM(ism, esd); |
179 | } |
180 | AliInfo(Form("Number of found tracks : %d", ntracks)); |
181 | return ntracks; |
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182 | } |
183 | |
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184 | |
185 | //_____________________________________________________________________________ |
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186 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
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187 | { |
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188 | //AliInfo(Form("Asking for tracklet %d", index)); |
189 | |
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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; |
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194 | |
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195 | // get detector for this tracklet |
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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); |
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201 | Double_t local[3]; |
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202 | local[0] = tracklet->GetX(); |
203 | local[1] = tracklet->GetY(); |
204 | local[2] = tracklet->GetZ(); |
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205 | Double_t global[3]; |
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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); |
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218 | |
219 | // setting volume id |
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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; |
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226 | } |
227 | |
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228 | //____________________________________________________________________ |
229 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() |
230 | { |
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231 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); |
232 | return fgTiltedRieman; |
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233 | } |
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234 | |
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235 | //____________________________________________________________________ |
236 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() |
237 | { |
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238 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); |
239 | return fgTiltedRiemanConstrained; |
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240 | } |
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241 | |
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242 | //____________________________________________________________________ |
243 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() |
244 | { |
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245 | if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer); |
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246 | return fgRieman; |
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247 | } |
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248 | |
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249 | //_____________________________________________________________________________ |
250 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) |
251 | { |
2a3191bb |
252 | // Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building |
253 | // a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points, |
254 | // covariance, PID, etc.) are than used to update the corresponding ESD track. |
255 | // Each track seed is first propagated to the geometrical limit of the TRD detector. |
256 | // Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are |
257 | // constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated. |
258 | // Otherwise the ESD track is left unchanged. |
259 | // |
260 | // The following steps are performed: |
261 | // 1. Selection of tracks based on the variance in the y-z plane. |
262 | // 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set. |
263 | // 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking |
264 | // the following status bits: |
265 | // - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume |
266 | // - AliESDtrack::kTRDStop - if the tracks fails propagation |
267 | // - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting |
268 | // 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout. |
269 | // 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set. |
270 | // |
271 | |
272 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor |
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273 | if (!calibra) AliInfo("Could not get Calibra instance\n"); |
274 | |
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275 | // Define scalers |
276 | Int_t nFound = 0, // number of tracks found |
277 | nSeeds = 0, // total number of ESD seeds |
278 | nTRDseeds= 0, // number of seeds in the TRD acceptance |
279 | nTPCseeds= 0; // number of TPC seeds |
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280 | Float_t foundMin = 20.0; |
281 | |
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282 | Float_t *quality = NULL; |
283 | Int_t *index = NULL; |
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284 | nSeeds = event->GetNumberOfTracks(); |
285 | // Sort tracks according to quality |
286 | // (covariance in the yz plane) |
287 | if(nSeeds){ |
288 | quality = new Float_t[nSeeds]; |
289 | index = new Int_t[nSeeds]; |
290 | for (Int_t iSeed = nSeeds; iSeed--;) { |
d611c74f |
291 | AliESDtrack *seed = event->GetTrack(iSeed); |
292 | Double_t covariance[15]; |
293 | seed->GetExternalCovariance(covariance); |
294 | quality[iSeed] = covariance[0] + covariance[2]; |
295 | } |
eb2b4f91 |
296 | TMath::Sort(nSeeds, quality, index,kFALSE); |
41702fec |
297 | } |
41702fec |
298 | |
eb2b4f91 |
299 | // Propagate all seeds |
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300 | Int_t expectedClr; |
301 | AliTRDtrackV1 track; |
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302 | for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) { |
41702fec |
303 | |
304 | // Get the seeds in sorted sequence |
305 | AliESDtrack *seed = event->GetTrack(index[iSeed]); |
eb2b4f91 |
306 | Float_t p4 = seed->GetC(seed->GetBz()); |
41702fec |
307 | |
308 | // Check the seed status |
309 | ULong_t status = seed->GetStatus(); |
310 | if ((status & AliESDtrack::kTPCout) == 0) continue; |
311 | if ((status & AliESDtrack::kTRDout) != 0) continue; |
eb2b4f91 |
312 | |
313 | // Propagate to the entrance in the TRD mother volume |
41702fec |
314 | new(&track) AliTRDtrackV1(*seed); |
eb2b4f91 |
315 | if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){ |
316 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
317 | continue; |
318 | } |
319 | if(!AdjustSector(&track)){ |
320 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
321 | continue; |
322 | } |
323 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) { |
324 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
325 | continue; |
326 | } |
327 | |
328 | nTPCseeds++; |
e4d4864b |
329 | |
eb2b4f91 |
330 | // store track status at TRD entrance |
76b60503 |
331 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
ae3fbe1f |
332 | |
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333 | // prepare track and do propagation in the TRD |
4d6aee34 |
334 | track.SetReconstructor(fkReconstructor); |
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335 | track.SetKink(Bool_t(seed->GetKinkIndex(0))); |
336 | expectedClr = FollowBackProlongation(track); |
337 | // check if track entered the TRD fiducial volume |
338 | if(track.GetTrackLow()){ |
339 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); |
340 | nTRDseeds++; |
341 | } |
342 | // check if track was stopped in the TRD |
343 | if (expectedClr<0){ |
344 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
345 | continue; |
346 | } |
ae3fbe1f |
347 | |
348 | if(expectedClr){ |
eb2b4f91 |
349 | nFound++; |
41702fec |
350 | // computes PID for track |
351 | track.CookPID(); |
352 | // update calibration references using this track |
353 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); |
354 | // save calibration object |
a2fbb6ec |
355 | if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
224f357f |
356 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); |
357 | calibTrack->SetOwner(); |
358 | seed->AddCalibObject(calibTrack); |
359 | } |
360 | //update ESD track |
41702fec |
361 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { |
2389e96f |
362 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
41702fec |
363 | track.UpdateESDtrack(seed); |
41702fec |
364 | } |
365 | } |
366 | |
27fbeba8 |
367 | if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) { |
e3cf3d02 |
368 | |
41702fec |
369 | // Make backup for back propagation |
41702fec |
370 | Int_t foundClr = track.GetNumberOfClusters(); |
371 | if (foundClr >= foundMin) { |
41702fec |
372 | track.CookLabel(1. - fgkLabelFraction); |
f29f13a6 |
373 | //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); |
41702fec |
374 | |
375 | // Sign only gold tracks |
376 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { |
f29f13a6 |
377 | //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track); |
41702fec |
378 | } |
379 | Bool_t isGold = kFALSE; |
380 | |
381 | // Full gold track |
382 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { |
383 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
384 | |
385 | isGold = kTRUE; |
386 | } |
387 | |
388 | // Almost gold track |
389 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { |
390 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); |
391 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
392 | |
393 | isGold = kTRUE; |
394 | } |
395 | |
396 | if ((!isGold) && (track.GetBackupTrack())) { |
397 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { |
398 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
399 | isGold = kTRUE; |
400 | } |
401 | } |
41702fec |
402 | } |
403 | } |
404 | |
eb2b4f91 |
405 | // Propagation to the TOF |
406 | if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) { |
407 | Int_t sm = track.GetSector(); |
408 | // default value in case we have problems with the geometry. |
409 | Double_t xtof = 371.; |
410 | //Calculate radial position of the beginning of the TOF |
411 | //mother volume. In order to avoid mixing of the TRD |
412 | //and TOF modules some hard values are needed. This are: |
413 | //1. The path to the TOF module. |
414 | //2. The width of the TOF (29.05 cm) |
415 | //(with the help of Annalisa de Caro Mar-17-2009) |
416 | if(gGeoManager){ |
417 | gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm)); |
4d6aee34 |
418 | TGeoHMatrix *m = NULL; |
eb2b4f91 |
419 | Double_t loc[]={0., 0., -.5*29.05}, glob[3]; |
420 | |
421 | if((m=gGeoManager->GetCurrentMatrix())){ |
422 | m->LocalToMaster(loc, glob); |
423 | xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]); |
424 | } |
41702fec |
425 | } |
672b48bd |
426 | if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){ |
427 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
428 | continue; |
429 | } |
430 | if(!AdjustSector(&track)){ |
431 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
432 | continue; |
433 | } |
434 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){ |
435 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
436 | continue; |
437 | } |
eb2b4f91 |
438 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
439 | // TODO obsolete - delete |
440 | seed->SetTRDQuality(track.StatusForTOF()); |
41702fec |
441 | } |
41702fec |
442 | seed->SetTRDBudget(track.GetBudget(0)); |
443 | } |
d611c74f |
444 | if(index) delete [] index; |
445 | if(quality) delete [] quality; |
41702fec |
446 | |
d4cf71ca |
447 | AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds)); |
448 | AliInfo(Form("Number of tracks: TRDout[%d]", nFound)); |
449 | |
d611c74f |
450 | // run stand alone tracking |
4d6aee34 |
451 | if (fkReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec |
452 | |
453 | return 0; |
0906e73e |
454 | } |
455 | |
456 | |
457 | //____________________________________________________________________ |
458 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) |
459 | { |
41702fec |
460 | // |
461 | // Refits tracks within the TRD. The ESD event is expected to contain seeds |
462 | // at the outer part of the TRD. |
463 | // The tracks are propagated to the innermost time bin |
464 | // of the TRD and the ESD event is updated |
465 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) |
466 | // |
467 | |
468 | Int_t nseed = 0; // contor for loaded seeds |
469 | Int_t found = 0; // contor for updated TRD tracks |
470 | |
471 | |
472 | AliTRDtrackV1 track; |
473 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { |
474 | AliESDtrack *seed = event->GetTrack(itrack); |
475 | new(&track) AliTRDtrackV1(*seed); |
476 | |
477 | if (track.GetX() < 270.0) { |
478 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
479 | continue; |
480 | } |
481 | |
e3cf3d02 |
482 | // reject tracks which failed propagation in the TRD or |
483 | // are produced by the TRD stand alone tracker |
41702fec |
484 | ULong_t status = seed->GetStatus(); |
e3cf3d02 |
485 | if(!(status & AliESDtrack::kTRDout)) continue; |
486 | if(!(status & AliESDtrack::kTRDin)) continue; |
41702fec |
487 | nseed++; |
488 | |
489 | track.ResetCovariance(50.0); |
490 | |
491 | // do the propagation and processing |
492 | Bool_t kUPDATE = kFALSE; |
493 | Double_t xTPC = 250.0; |
494 | if(FollowProlongation(track)){ |
495 | // Prolongate to TPC |
496 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update |
e3cf3d02 |
497 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
498 | found++; |
499 | kUPDATE = kTRUE; |
500 | } |
501 | |
502 | // Update the friend track |
a2fbb6ec |
503 | if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
4d6aee34 |
504 | TObject *o = NULL; Int_t ic = 0; |
505 | AliTRDtrackV1 *calibTrack = NULL; |
e3cf3d02 |
506 | while((o = seed->GetCalibObject(ic++))){ |
507 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; |
508 | calibTrack->SetTrackHigh(track.GetTrackHigh()); |
509 | } |
41702fec |
510 | } |
e3cf3d02 |
511 | } |
41702fec |
512 | |
513 | // Prolongate to TPC without update |
514 | if(!kUPDATE) { |
515 | AliTRDtrackV1 tt(*seed); |
e3cf3d02 |
516 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup); |
41702fec |
517 | } |
518 | } |
519 | AliInfo(Form("Number of loaded seeds: %d",nseed)); |
520 | AliInfo(Form("Number of found tracks from loaded seeds: %d",found)); |
521 | |
522 | return 0; |
0906e73e |
523 | } |
524 | |
0906e73e |
525 | //____________________________________________________________________ |
526 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) |
527 | { |
41702fec |
528 | // Extrapolates the TRD track in the TPC direction. |
529 | // |
530 | // Parameters |
531 | // t : the TRD track which has to be extrapolated |
532 | // |
533 | // Output |
534 | // number of clusters attached to the track |
535 | // |
536 | // Detailed description |
537 | // |
538 | // Starting from current radial position of track <t> this function |
539 | // extrapolates the track through the 6 TRD layers. The following steps |
540 | // are being performed for each plane: |
541 | // 1. prepare track: |
542 | // a. get plane limits in the local x direction |
543 | // b. check crossing sectors |
544 | // c. check track inclination |
545 | // 2. search tracklet in the tracker list (see GetTracklet() for details) |
546 | // 3. evaluate material budget using the geo manager |
547 | // 4. propagate and update track using the tracklet information. |
548 | // |
549 | // Debug level 2 |
550 | // |
551 | |
e3cf3d02 |
552 | Bool_t kStoreIn = kTRUE; |
41702fec |
553 | Int_t nClustersExpected = 0; |
e3cf3d02 |
554 | for (Int_t iplane = kNPlanes; iplane--;) { |
41702fec |
555 | Int_t index = 0; |
556 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
557 | if(!tracklet) continue; |
558 | if(!tracklet->IsOK()) AliWarning("tracklet not OK"); |
559 | |
e3cf3d02 |
560 | Double_t x = tracklet->GetX();//GetX0(); |
41702fec |
561 | // reject tracklets which are not considered for inward refit |
562 | if(x > t.GetX()+fgkMaxStep) continue; |
563 | |
564 | // append tracklet to track |
565 | t.SetTracklet(tracklet, index); |
566 | |
567 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; |
568 | if (!AdjustSector(&t)) break; |
569 | |
570 | // Start global position |
571 | Double_t xyz0[3]; |
572 | t.GetXYZ(xyz0); |
573 | |
574 | // End global position |
575 | Double_t alpha = t.GetAlpha(), y, z; |
576 | if (!t.GetProlongation(x,y,z)) break; |
577 | Double_t xyz1[3]; |
578 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
579 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
580 | xyz1[2] = z; |
581 | |
51a23065 |
582 | Double_t length = TMath::Sqrt( |
583 | (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) + |
584 | (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) + |
585 | (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2]) |
586 | ); |
587 | if(length>0.){ |
588 | // Get material budget |
589 | Double_t param[7]; |
590 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break; |
591 | Double_t xrho= param[0]*param[4]; |
592 | Double_t xx0 = param[1]; // Get mean propagation parameters |
593 | |
594 | // Propagate and update |
595 | t.PropagateTo(x, xx0, xrho); |
596 | if (!AdjustSector(&t)) break; |
597 | } |
e3cf3d02 |
598 | if(kStoreIn){ |
599 | t.SetTrackHigh(); |
600 | kStoreIn = kFALSE; |
601 | } |
602 | |
b72f4eaf |
603 | Double_t cov[3]; tracklet->GetCovAt(x, cov); |
604 | Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()}; |
605 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); |
606 | if (chi2 < 1e+10 && t.Update(p, cov, chi2)){ |
41702fec |
607 | nClustersExpected += tracklet->GetN(); |
608 | } |
609 | } |
610 | |
a2fbb6ec |
611 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1){ |
41702fec |
612 | Int_t index; |
51a23065 |
613 | for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){ |
41702fec |
614 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
615 | if(!tracklet) continue; |
616 | t.SetTracklet(tracklet, index); |
617 | } |
618 | |
a2fbb6ec |
619 | if(fkReconstructor->IsDebugStreaming()){ |
620 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
621 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
622 | AliTRDtrackV1 track(t); |
623 | track.SetOwner(); |
624 | cstreamer << "FollowProlongation" |
625 | << "EventNumber=" << eventNumber |
626 | << "ncl=" << nClustersExpected |
627 | << "track.=" << &track |
628 | << "\n"; |
629 | } |
41702fec |
630 | } |
41702fec |
631 | return nClustersExpected; |
0906e73e |
632 | |
633 | } |
634 | |
635 | //_____________________________________________________________________________ |
636 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) |
637 | { |
afa21247 |
638 | // Extrapolates/Build the TRD track in the TOF direction. |
639 | // |
640 | // Parameters |
641 | // t : the TRD track which has to be extrapolated |
642 | // |
643 | // Output |
644 | // number of clusters attached to the track |
645 | // |
646 | // Starting from current radial position of track <t> this function |
647 | // extrapolates the track through the 6 TRD layers. The following steps |
648 | // are being performed for each plane: |
649 | // 1. Propagate track to the entrance of the next chamber: |
650 | // - get chamber limits in the radial direction |
651 | // - check crossing sectors |
652 | // - check track inclination |
653 | // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary()) |
654 | // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only |
655 | // Kalman filter is needed and tracklets are already linked to the track this step is skipped. |
656 | // 3. Fit tracklet using the information from the Kalman filter. |
657 | // 4. Propagate and update track at reference radial position of the tracklet. |
658 | // 5. Register tracklet with the tracker and track; update pulls monitoring. |
659 | // |
660 | // Observation |
2a3191bb |
661 | // 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: |
662 | // - AliTRDtrackV1::kProlongation : track prolongation failed |
663 | // - AliTRDtrackV1::kPropagation : track prolongation failed |
664 | // - AliTRDtrackV1::kAdjustSector : failed during sector crossing |
665 | // - AliTRDtrackV1::kSnp : too large bending |
666 | // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet |
667 | // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet |
668 | // - AliTRDtrackV1::kUnknown : anything which is not covered before |
afa21247 |
669 | // 2. By default the status of the track before first TRD update is saved. |
670 | // |
671 | // Debug level 2 |
672 | // |
673 | // Author |
674 | // Alexandru Bercuci <A.Bercuci@gsi.de> |
675 | // |
41702fec |
676 | |
eb2b4f91 |
677 | Int_t n = 0; |
678 | Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); |
4d6aee34 |
679 | AliTRDtrackingChamber *chamber = NULL; |
41702fec |
680 | |
7c3eecb8 |
681 | Int_t debugLevel = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) : 0; |
682 | TTreeSRedirector *cstreamer = fkReconstructor->IsDebugStreaming() ? fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker) : 0x0; |
683 | |
4d6aee34 |
684 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
181d2c97 |
685 | // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array |
686 | AliTRDseedV1 *tracklets[kNPlanes]; |
687 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); |
688 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
689 | tracklets[ip] = t.GetTracklet(ip); |
690 | t.UnsetTracklet(ip); |
691 | } |
81a6494d |
692 | Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE; |
e3cf3d02 |
693 | |
053767a4 |
694 | // Loop through the TRD layers |
4d6aee34 |
695 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 |
696 | Double_t x, y, z; |
697 | for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) { |
698 | // rough estimate of the entry point |
699 | if (!t.GetProlongation(fR[ily], y, z)){ |
700 | n=-1; |
701 | t.SetStatus(AliTRDtrackV1::kProlongation); |
702 | break; |
703 | } |
41702fec |
704 | |
eb2b4f91 |
705 | // find sector / stack / detector |
706 | sm = t.GetSector(); |
707 | // TODO cross check with y value ! |
708 | stk = fGeom->GetStack(z, ily); |
709 | det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1; |
4d6aee34 |
710 | matrix = det>=0 ? fGeom->GetClusterMatrix(det) : NULL; |
eb2b4f91 |
711 | |
712 | // check if supermodule/chamber is installed |
713 | if( !fGeom->GetSMstatus(sm) || |
714 | stk<0. || |
715 | fGeom->IsHole(ily, stk, sm) || |
716 | !matrix ){ |
717 | // propagate to the default radial position |
718 | if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){ |
719 | n=-1; |
720 | t.SetStatus(AliTRDtrackV1::kPropagation); |
41702fec |
721 | break; |
722 | } |
eb2b4f91 |
723 | if(!AdjustSector(&t)){ |
724 | n=-1; |
725 | t.SetStatus(AliTRDtrackV1::kAdjustSector); |
726 | break; |
727 | } |
728 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){ |
729 | n=-1; |
730 | t.SetStatus(AliTRDtrackV1::kSnp); |
731 | break; |
732 | } |
733 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); |
41702fec |
734 | continue; |
735 | } |
e3cf3d02 |
736 | |
eb2b4f91 |
737 | // retrieve rotation matrix for the current chamber |
738 | Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.}; |
739 | Double_t glb[] = {0., 0., 0.}; |
740 | matrix->LocalToMaster(loc, glb); |
741 | |
742 | // Propagate to the radial distance of the current layer |
743 | x = glb[0] - fgkMaxStep; |
744 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){ |
745 | n=-1; |
746 | t.SetStatus(AliTRDtrackV1::kPropagation); |
747 | break; |
748 | } |
749 | if(!AdjustSector(&t)){ |
750 | n=-1; |
751 | t.SetStatus(AliTRDtrackV1::kAdjustSector); |
752 | break; |
753 | } |
754 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { |
755 | n=-1; |
756 | t.SetStatus(AliTRDtrackV1::kSnp); |
757 | break; |
758 | } |
4d6aee34 |
759 | Bool_t doRecalculate = kFALSE; |
eb2b4f91 |
760 | if(sm != t.GetSector()){ |
761 | sm = t.GetSector(); |
4d6aee34 |
762 | doRecalculate = kTRUE; |
eb2b4f91 |
763 | } |
764 | if(stk != fGeom->GetStack(z, ily)){ |
765 | stk = fGeom->GetStack(z, ily); |
4d6aee34 |
766 | doRecalculate = kTRUE; |
eb2b4f91 |
767 | } |
4d6aee34 |
768 | if(doRecalculate){ |
eb2b4f91 |
769 | det = AliTRDgeometry::GetDetector(ily, stk, sm); |
770 | if(!(matrix = fGeom->GetClusterMatrix(det))){ |
771 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); |
772 | continue; |
773 | } |
774 | matrix->LocalToMaster(loc, glb); |
775 | x = glb[0] - fgkMaxStep; |
776 | } |
777 | |
778 | // check if track is well inside fiducial volume |
779 | if (!t.GetProlongation(x+fgkMaxStep, y, z)) { |
780 | n=-1; |
781 | t.SetStatus(AliTRDtrackV1::kProlongation); |
782 | break; |
783 | } |
784 | if(fGeom->IsOnBoundary(det, y, z, .5)){ |
785 | t.SetStatus(AliTRDtrackV1::kBoundary, ily); |
786 | continue; |
787 | } |
788 | // mark track as entering the FIDUCIAL volume of TRD |
e3cf3d02 |
789 | if(kStoreIn){ |
790 | t.SetTrackLow(); |
791 | kStoreIn = kFALSE; |
792 | } |
b1957d3c |
793 | |
eb2b4f91 |
794 | ptrTracklet = tracklets[ily]; |
795 | if(!ptrTracklet){ // BUILD TRACKLET |
796 | // check data in supermodule |
797 | if(!fTrSec[sm].GetNChambers()){ |
798 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
799 | continue; |
800 | } |
801 | if(fTrSec[sm].GetX(ily) < 1.){ |
802 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
803 | continue; |
804 | } |
805 | |
806 | // check data in chamber |
807 | if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){ |
808 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
809 | continue; |
810 | } |
4d6aee34 |
811 | if(chamber->GetNClusters() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){ |
eb2b4f91 |
812 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
813 | continue; |
814 | } |
815 | // build tracklet |
816 | ptrTracklet = new(&tracklet) AliTRDseedV1(det); |
4d6aee34 |
817 | ptrTracklet->SetReconstructor(fkReconstructor); |
eb2b4f91 |
818 | ptrTracklet->SetKink(t.IsKink()); |
819 | ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk)); |
820 | ptrTracklet->SetX0(glb[0]+driftLength); |
821 | if(!tracklet.Init(&t)){ |
822 | n=-1; |
823 | t.SetStatus(AliTRDtrackV1::kTrackletInit); |
824 | break; |
825 | } |
826 | if(!tracklet.AttachClusters(chamber, kTRUE)){ |
827 | t.SetStatus(AliTRDtrackV1::kNoAttach, ily); |
7c3eecb8 |
828 | if(debugLevel>3){ |
829 | AliTRDseedV1 trackletCp(*ptrTracklet); |
830 | UChar_t status(t.GetStatusTRD(ily)); |
831 | (*cstreamer) << "FollowBackProlongation2" |
832 | <<"status=" << status |
833 | <<"tracklet.=" << &trackletCp |
834 | << "\n"; |
835 | } |
eb2b4f91 |
836 | continue; |
837 | } |
4d6aee34 |
838 | if(tracklet.GetN() < fgNTimeBins*fkReconstructor->GetRecoParam() ->GetFindableClusters()){ |
eb2b4f91 |
839 | t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily); |
7c3eecb8 |
840 | if(debugLevel>3){ |
841 | AliTRDseedV1 trackletCp(*ptrTracklet); |
842 | UChar_t status(t.GetStatusTRD(ily)); |
843 | (*cstreamer) << "FollowBackProlongation2" |
844 | <<"status=" << status |
845 | <<"tracklet.=" << &trackletCp |
846 | << "\n"; |
847 | } |
eb2b4f91 |
848 | continue; |
849 | } |
850 | ptrTracklet->UpdateUsed(); |
851 | } |
eb2b4f91 |
852 | // propagate track to the radial position of the tracklet |
853 | ptrTracklet->UseClusters(); // TODO ? do we need this here ? |
854 | // fit tracklet no tilt correction |
855 | if(!ptrTracklet->Fit(kFALSE)){ |
856 | t.SetStatus(AliTRDtrackV1::kNoFit, ily); |
857 | continue; |
858 | } |
859 | x = ptrTracklet->GetX(); //GetX0(); |
860 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) { |
861 | n=-1; |
862 | t.SetStatus(AliTRDtrackV1::kPropagation); |
863 | break; |
864 | } |
865 | if(!AdjustSector(&t)) { |
866 | n=-1; |
867 | t.SetStatus(AliTRDtrackV1::kAdjustSector); |
868 | break; |
41702fec |
869 | } |
eb2b4f91 |
870 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { |
871 | n=-1; |
872 | t.SetStatus(AliTRDtrackV1::kSnp); |
873 | break; |
874 | } |
81a6494d |
875 | if(kPropagateIn){ |
876 | t.SetTrackLow(); |
877 | kPropagateIn = kFALSE; |
878 | } |
b72f4eaf |
879 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
880 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; |
881 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); |
6e39bde4 |
882 | // update Kalman with the TRD measurement |
b72f4eaf |
883 | if(chi2>1e+10){ // TODO |
eb2b4f91 |
884 | t.SetStatus(AliTRDtrackV1::kChi2, ily); |
7c3eecb8 |
885 | if(debugLevel > 2){ |
886 | UChar_t status(t.GetStatusTRD()); |
887 | AliTRDseedV1 trackletCp(*ptrTracklet); |
888 | AliTRDtrackV1 trackCp(t); |
889 | trackCp.SetOwner(); |
890 | (*cstreamer) << "FollowBackProlongation1" |
891 | << "status=" << status |
892 | << "tracklet.=" << &trackletCp |
893 | << "track.=" << &trackCp |
894 | << "\n"; |
895 | } |
eb2b4f91 |
896 | continue; |
897 | } |
b72f4eaf |
898 | if(!t.Update(p, cov, chi2)) { |
eb2b4f91 |
899 | n=-1; |
900 | t.SetStatus(AliTRDtrackV1::kUpdate); |
7c3eecb8 |
901 | if(debugLevel > 2){ |
902 | UChar_t status(t.GetStatusTRD()); |
903 | AliTRDseedV1 trackletCp(*ptrTracklet); |
904 | AliTRDtrackV1 trackCp(t); |
905 | trackCp.SetOwner(); |
906 | (*cstreamer) << "FollowBackProlongation1" |
907 | << "status=" << status |
908 | << "tracklet.=" << &trackletCp |
909 | << "track.=" << &trackCp |
910 | << "\n"; |
911 | } |
eb2b4f91 |
912 | break; |
913 | } |
b72f4eaf |
914 | // fill residuals ?! |
915 | AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId()); |
916 | |
eb2b4f91 |
917 | |
918 | // load tracklet to the tracker |
16cca13f |
919 | ptrTracklet->Update(&t); |
eb2b4f91 |
920 | ptrTracklet = SetTracklet(ptrTracklet); |
921 | t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
922 | n += ptrTracklet->GetN(); |
923 | |
41702fec |
924 | // Reset material budget if 2 consecutive gold |
eb2b4f91 |
925 | // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec |
926 | |
927 | // Make backup of the track until is gold |
928 | // TO DO update quality check of the track. |
929 | // consider comparison with fTimeBinsRange |
930 | Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins); |
931 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); |
41702fec |
932 | |
eb2b4f91 |
933 | if( (chi2 < 18.0) && |
41702fec |
934 | (ratio0 > 0.8) && |
935 | //(ratio1 > 0.6) && |
936 | //(ratio0+ratio1 > 1.5) && |
937 | (t.GetNCross() == 0) && |
938 | (TMath::Abs(t.GetSnp()) < 0.85) && |
e3cf3d02 |
939 | (t.GetNumberOfClusters() > 20)){ |
940 | t.MakeBackupTrack(); |
941 | } |
053767a4 |
942 | } // end layers loop |
eb2b4f91 |
943 | //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD()); |
944 | //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n"); |
41702fec |
945 | |
7c3eecb8 |
946 | if(debugLevel > 1){ |
41702fec |
947 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
eb2b4f91 |
948 | AliTRDtrackV1 track(t); |
949 | track.SetOwner(); |
7c3eecb8 |
950 | (*cstreamer) << "FollowBackProlongation0" |
eb2b4f91 |
951 | << "EventNumber=" << eventNumber |
952 | << "ncl=" << n |
953 | << "track.=" << &track |
41702fec |
954 | << "\n"; |
955 | } |
956 | |
eb2b4f91 |
957 | return n; |
0906e73e |
958 | } |
959 | |
eb38ed55 |
960 | //_________________________________________________________________________ |
4d6aee34 |
961 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *const planes){ |
41702fec |
962 | // |
963 | // Fits a Riemann-circle to the given points without tilting pad correction. |
964 | // The fit is performed using an instance of the class AliRieman (equations |
965 | // and transformations see documentation of this class) |
966 | // Afterwards all the tracklets are Updated |
967 | // |
968 | // Parameters: - Array of tracklets (AliTRDseedV1) |
969 | // - Storage for the chi2 values (beginning with direction z) |
970 | // - Seeding configuration |
971 | // Output: - The curvature |
972 | // |
973 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); |
974 | fitter->Reset(); |
975 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; |
976 | Int_t *ppl = &allplanes[0]; |
977 | Int_t maxLayers = 6; |
978 | if(planes){ |
979 | maxLayers = 4; |
980 | ppl = planes; |
981 | } |
982 | for(Int_t il = 0; il < maxLayers; il++){ |
983 | if(!tracklets[ppl[il]].IsOK()) continue; |
e3cf3d02 |
984 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10); |
41702fec |
985 | } |
986 | fitter->Update(); |
987 | // Set the reference position of the fit and calculate the chi2 values |
988 | memset(chi2, 0, sizeof(Double_t) * 2); |
989 | for(Int_t il = 0; il < maxLayers; il++){ |
990 | // Reference positions |
991 | tracklets[ppl[il]].Init(fitter); |
992 | |
993 | // chi2 |
994 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; |
995 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); |
996 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); |
997 | } |
998 | return fitter->GetC(); |
eb38ed55 |
999 | } |
1000 | |
1001 | //_________________________________________________________________________ |
1002 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) |
1003 | { |
41702fec |
1004 | // |
1005 | // Performs a Riemann helix fit using the seedclusters as spacepoints |
1006 | // Afterwards the chi2 values are calculated and the seeds are updated |
1007 | // |
1008 | // Parameters: - The four seedclusters |
1009 | // - The tracklet array (AliTRDseedV1) |
1010 | // - The seeding configuration |
1011 | // - Chi2 array |
1012 | // |
1013 | // debug level 2 |
1014 | // |
1015 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); |
1016 | fitter->Reset(); |
a3743898 |
1017 | for(Int_t i = 0; i < 4; i++){ |
a3743898 |
1018 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.); |
1019 | } |
41702fec |
1020 | fitter->Update(); |
1021 | |
1022 | |
1023 | // Update the seed and calculated the chi2 value |
1024 | chi2[0] = 0; chi2[1] = 0; |
1025 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ |
1026 | // chi2 |
1027 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); |
1028 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); |
1029 | } |
eb38ed55 |
1030 | } |
1031 | |
1032 | |
1033 | //_________________________________________________________________________ |
1034 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) |
1035 | { |
41702fec |
1036 | // |
1037 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is |
1038 | // assumed that the vertex position is set to 0. |
1039 | // This method is very usefull for high-pt particles |
1040 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 |
1041 | // x0, y0: Center of the circle |
1042 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) |
1043 | // zc: center of the pad row |
1044 | // Equation which has to be fitted (after transformation): |
1045 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 |
1046 | // Transformation: |
1047 | // t = 1/(x^2 + y^2) |
1048 | // u = 2 * x * t |
1049 | // v = 2 * x * tan(phiT) * t |
1050 | // Parameters in the equation: |
1051 | // a = -1/y0, b = x0/y0, e = dz/dx |
1052 | // |
1053 | // The Curvature is calculated by the following equation: |
1054 | // - curv = a/Sqrt(b^2 + 1) = 1/R |
1055 | // Parameters: - the 6 tracklets |
1056 | // - the Vertex constraint |
1057 | // Output: - the Chi2 value of the track |
1058 | // |
1059 | // debug level 5 |
1060 | // |
1061 | |
1062 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); |
1063 | fitter->StoreData(kTRUE); |
1064 | fitter->ClearPoints(); |
4d6aee34 |
1065 | AliTRDcluster *cl = NULL; |
41702fec |
1066 | |
1067 | Float_t x, y, z, w, t, error, tilt; |
1068 | Double_t uvt[2]; |
1069 | Int_t nPoints = 0; |
053767a4 |
1070 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
1071 | if(!tracklets[ilr].IsOK()) continue; |
8d2bec9e |
1072 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
053767a4 |
1073 | if(!tracklets[ilr].IsUsable(itb)) continue; |
1074 | cl = tracklets[ilr].GetClusters(itb); |
1742f24c |
1075 | if(!cl->IsInChamber()) continue; |
41702fec |
1076 | x = cl->GetX(); |
1077 | y = cl->GetY(); |
1078 | z = cl->GetZ(); |
053767a4 |
1079 | tilt = tracklets[ilr].GetTilt(); |
41702fec |
1080 | // Transformation |
1081 | t = 1./(x * x + y * y); |
1082 | uvt[0] = 2. * x * t; |
1083 | uvt[1] = 2. * x * t * tilt ; |
1084 | w = 2. * (y + tilt * (z - zVertex)) * t; |
78b7d24c |
1085 | error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t; |
41702fec |
1086 | fitter->AddPoint(uvt, w, error); |
1087 | nPoints++; |
1088 | } |
1089 | } |
e17f4785 |
1090 | fitter->Eval(); |
41702fec |
1091 | |
1092 | // Calculate curvature |
1093 | Double_t a = fitter->GetParameter(0); |
1094 | Double_t b = fitter->GetParameter(1); |
1095 | Double_t curvature = a/TMath::Sqrt(b*b + 1); |
1096 | |
1097 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); |
1098 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) |
e3cf3d02 |
1099 | tracklets[ip].SetC(curvature); |
41702fec |
1100 | |
a2fbb6ec |
1101 | /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker()) >= 5){ |
41702fec |
1102 | //Linear Model on z-direction |
1103 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack |
1104 | Double_t slope = fitter->GetParameter(2); |
1105 | Double_t zref = slope * xref; |
1106 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); |
1107 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1108 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
4d6aee34 |
1109 | TTreeSRedirector &treeStreamer = *fkReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
1110 | treeStreamer << "FitTiltedRiemanConstraint" |
1111 | << "EventNumber=" << eventNumber |
1112 | << "CandidateNumber=" << candidateNumber |
1113 | << "Curvature=" << curvature |
1114 | << "Chi2Track=" << chi2track |
1115 | << "Chi2Z=" << chi2Z |
1116 | << "zref=" << zref |
1117 | << "\n"; |
3a039a31 |
1118 | }*/ |
41702fec |
1119 | return chi2track; |
eb38ed55 |
1120 | } |
1121 | |
1122 | //_________________________________________________________________________ |
1123 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) |
1124 | { |
41702fec |
1125 | // |
1126 | // Performs a Riemann fit taking tilting pad correction into account |
1127 | // The equation of a Riemann circle, where the y position is substituted by the |
1128 | // measured y-position taking pad tilting into account, has to be transformed |
1129 | // into a 4-dimensional hyperplane equation |
1130 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 |
1131 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) |
1132 | // zc: center of the pad row |
1133 | // zt: z-position of the track |
1134 | // The z-position of the track is assumed to be linear dependent on the x-position |
1135 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 |
1136 | // Transformation: u = 2 * x * t |
1137 | // v = 2 * tan(phiT) * t |
1138 | // w = 2 * tan(phiT) * (x - xref) * t |
1139 | // t = 1 / (x^2 + ymeas^2) |
1140 | // Parameters: a = -1/y0 |
1141 | // b = x0/y0 |
1142 | // c = (R^2 -x0^2 - y0^2)/y0 |
1143 | // d = offset |
1144 | // e = dz/dx |
1145 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using |
1146 | // results from the simple riemann fit. Afterwards the fit is redone. |
1147 | // The curvature is calculated according to the formula: |
1148 | // curv = a/(1 + b^2 + c*a) = 1/R |
1149 | // |
1150 | // Paramters: - Array of tracklets (connected to the track candidate) |
1151 | // - Flag selecting the error definition |
1152 | // Output: - Chi2 values of the track (in Parameter list) |
1153 | // |
1154 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1155 | fitter->StoreData(kTRUE); |
1156 | fitter->ClearPoints(); |
1157 | AliTRDLeastSquare zfitter; |
4d6aee34 |
1158 | AliTRDcluster *cl = NULL; |
41702fec |
1159 | |
1160 | Double_t xref = CalculateReferenceX(tracklets); |
6e39bde4 |
1161 | Double_t x, y, z, t, tilt, dx, w, we, erry, errz; |
1162 | Double_t uvt[4], sumPolY[5], sumPolZ[3]; |
1163 | memset(sumPolY, 0, sizeof(Double_t) * 5); |
1164 | memset(sumPolZ, 0, sizeof(Double_t) * 3); |
41702fec |
1165 | Int_t nPoints = 0; |
1166 | // Containers for Least-square fitter |
1167 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1168 | if(!tracklets[ipl].IsOK()) continue; |
ed15ef4f |
1169 | tilt = tracklets[ipl].GetTilt(); |
8d2bec9e |
1170 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec |
1171 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1742f24c |
1172 | if(!cl->IsInChamber()) continue; |
41702fec |
1173 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1174 | x = cl->GetX(); |
1175 | y = cl->GetY(); |
1176 | z = cl->GetZ(); |
41702fec |
1177 | dx = x - xref; |
1178 | // Transformation |
1179 | t = 1./(x*x + y*y); |
1180 | uvt[0] = 2. * x * t; |
1181 | uvt[1] = t; |
1182 | uvt[2] = 2. * tilt * t; |
1183 | uvt[3] = 2. * tilt * dx * t; |
1184 | w = 2. * (y + tilt*z) * t; |
1185 | // error definition changes for the different calls |
1186 | we = 2. * t; |
78b7d24c |
1187 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2; |
41702fec |
1188 | fitter->AddPoint(uvt, w, we); |
1189 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
6e39bde4 |
1190 | // adding points for covariance matrix estimation |
1191 | erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration) |
1192 | erry *= erry; |
1193 | errz = 1./cl->GetSigmaZ2(); |
1194 | for(Int_t ipol = 0; ipol < 5; ipol++){ |
1195 | sumPolY[ipol] += erry; |
1196 | erry *= x; |
1197 | if(ipol < 3){ |
1198 | sumPolZ[ipol] += errz; |
1199 | errz *= x; |
1200 | } |
1201 | } |
41702fec |
1202 | nPoints++; |
1203 | } |
1204 | } |
e17f4785 |
1205 | fitter->Eval(); |
41702fec |
1206 | zfitter.Eval(); |
1207 | |
1208 | Double_t offset = fitter->GetParameter(3); |
1209 | Double_t slope = fitter->GetParameter(4); |
1210 | |
1211 | // Linear fitter - not possible to make boundaries |
1212 | // Do not accept non possible z and dzdx combinations |
1213 | Bool_t acceptablez = kTRUE; |
1214 | Double_t zref = 0.0; |
1215 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
1216 | if(!tracklets[iLayer].IsOK()) continue; |
1217 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); |
e3cf3d02 |
1218 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
41702fec |
1219 | acceptablez = kFALSE; |
1220 | } |
1221 | if (!acceptablez) { |
1222 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1223 | Double_t zmf = zfitter.GetFunctionValue(&xref); |
1224 | fgTiltedRieman->FixParameter(3, zmf); |
1225 | fgTiltedRieman->FixParameter(4, dzmf); |
e17f4785 |
1226 | fitter->Eval(); |
41702fec |
1227 | fitter->ReleaseParameter(3); |
1228 | fitter->ReleaseParameter(4); |
1229 | offset = fitter->GetParameter(3); |
1230 | slope = fitter->GetParameter(4); |
1231 | } |
1232 | |
1233 | // Calculate Curvarture |
1234 | Double_t a = fitter->GetParameter(0); |
1235 | Double_t b = fitter->GetParameter(1); |
1236 | Double_t c = fitter->GetParameter(2); |
1237 | Double_t curvature = 1.0 + b*b - c*a; |
1238 | if (curvature > 0.0) |
1239 | curvature = a / TMath::Sqrt(curvature); |
1240 | |
1241 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); |
1242 | |
6e39bde4 |
1243 | // Prepare error calculation |
1244 | TMatrixD covarPolY(3,3); |
1245 | covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4]; |
1246 | covarPolY(0,1) = covarPolY(1,0) = sumPolY[1]; |
1247 | covarPolY(0,2) = covarPolY(2,0) = sumPolY[2]; |
1248 | covarPolY(2,1) = covarPolY(1,2) = sumPolY[3]; |
1249 | covarPolY.Invert(); |
1250 | TMatrixD covarPolZ(2,2); |
1251 | covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2]; |
1252 | covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1]; |
1253 | covarPolZ.Invert(); |
1254 | |
41702fec |
1255 | // Update the tracklets |
6e39bde4 |
1256 | Double_t x1, dy, dz; |
1257 | Double_t cov[15]; |
1258 | memset(cov, 0, sizeof(Double_t) * 15); |
41702fec |
1259 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { |
1260 | |
1261 | x = tracklets[iLayer].GetX0(); |
6e39bde4 |
1262 | x1 = x - xref; |
41702fec |
1263 | y = 0; |
1264 | z = 0; |
1265 | dy = 0; |
1266 | dz = 0; |
6e39bde4 |
1267 | memset(cov, 0, sizeof(Double_t) * 3); |
1268 | TMatrixD transform(3,3); |
1269 | transform(0,0) = 1; |
1270 | transform(0,1) = x; |
1271 | transform(0,2) = x*x; |
1272 | transform(1,1) = 1; |
1273 | transform(1,2) = x; |
1274 | transform(2,2) = 1; |
1275 | TMatrixD covariance(transform, TMatrixD::kMult, covarPolY); |
1276 | covariance *= transform.T(); |
1277 | TMatrixD transformZ(2,2); |
1278 | transformZ(0,0) = transformZ(1,1) = 1; |
1279 | transformZ(0,1) = x; |
1280 | TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ); |
1281 | covarZ *= transformZ.T(); |
41702fec |
1282 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1283 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) |
1284 | // R = Sqrt() = 1/Curvature |
1285 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) |
1286 | Double_t res = (x * a + b); // = (x - x0)/y0 |
1287 | res *= res; |
1288 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 |
1289 | if (res >= 0) { |
1290 | res = TMath::Sqrt(res); |
1291 | y = (1.0 - res) / a; |
1292 | } |
6e39bde4 |
1293 | cov[0] = covariance(0,0); |
1294 | cov[2] = covarZ(0,0); |
1295 | cov[1] = 0.; |
41702fec |
1296 | |
1297 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 |
1298 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 |
1299 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) |
1300 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) |
1301 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) |
1302 | Double_t x0 = -b / a; |
1303 | if (-c * a + b * b + 1 > 0) { |
1304 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { |
6e39bde4 |
1305 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); |
1306 | if (a < 0) yderiv *= -1.0; |
1307 | dy = yderiv; |
41702fec |
1308 | } |
1309 | } |
1310 | z = offset + slope * (x - xref); |
1311 | dz = slope; |
1312 | tracklets[iLayer].SetYref(0, y); |
1313 | tracklets[iLayer].SetYref(1, dy); |
1314 | tracklets[iLayer].SetZref(0, z); |
1315 | tracklets[iLayer].SetZref(1, dz); |
1316 | tracklets[iLayer].SetC(curvature); |
6e39bde4 |
1317 | tracklets[iLayer].SetCovRef(cov); |
41702fec |
1318 | tracklets[iLayer].SetChi2(chi2track); |
1319 | } |
1320 | |
a2fbb6ec |
1321 | /* if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >=5){ |
1322 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec |
1323 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1324 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
1325 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); |
1326 | cstreamer << "FitTiltedRieman0" |
1327 | << "EventNumber=" << eventNumber |
1328 | << "CandidateNumber=" << candidateNumber |
1329 | << "xref=" << xref |
1330 | << "Chi2Z=" << chi2z |
1331 | << "\n"; |
3a039a31 |
1332 | }*/ |
41702fec |
1333 | return chi2track; |
eb38ed55 |
1334 | } |
1335 | |
3b57a3f7 |
1336 | |
9e333711 |
1337 | //____________________________________________________________________ |
6e4d4425 |
1338 | Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
9e333711 |
1339 | { |
4d6aee34 |
1340 | // |
1341 | // Fit track with a staight line |
1342 | // Fills an AliTrackPoint array with np points |
1343 | // Function should be used to refit tracks when no magnetic field was on |
1344 | // |
9e333711 |
1345 | AliTRDLeastSquare yfitter, zfitter; |
4d6aee34 |
1346 | AliTRDcluster *cl = NULL; |
9e333711 |
1347 | |
4d6aee34 |
1348 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
9e333711 |
1349 | if(!tracklets){ |
1350 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1351 | if(!(tracklet = track->GetTracklet(ipl))) continue; |
1352 | if(!tracklet->IsOK()) continue; |
1353 | new(&work[ipl]) AliTRDseedV1(*tracklet); |
1354 | } |
1355 | tracklets = &work[0]; |
1356 | } |
1357 | |
1358 | Double_t xref = CalculateReferenceX(tracklets); |
1359 | Double_t x, y, z, dx, ye, yr, tilt; |
1360 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1361 | if(!tracklets[ipl].IsOK()) continue; |
1362 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
1363 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1364 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1365 | x = cl->GetX(); |
1366 | z = cl->GetZ(); |
1367 | dx = x - xref; |
1368 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
1369 | } |
1370 | } |
1371 | zfitter.Eval(); |
1372 | Double_t z0 = zfitter.GetFunctionParameter(0); |
1373 | Double_t dzdx = zfitter.GetFunctionParameter(1); |
1374 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1375 | if(!tracklets[ipl].IsOK()) continue; |
1376 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
1377 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1378 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1379 | x = cl->GetX(); |
1380 | y = cl->GetY(); |
1381 | z = cl->GetZ(); |
1382 | tilt = tracklets[ipl].GetTilt(); |
1383 | dx = x - xref; |
1384 | yr = y + tilt*(z - z0 - dzdx*dx); |
1385 | // error definition changes for the different calls |
1386 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); |
1387 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; |
1388 | yfitter.AddPoint(&dx, yr, ye); |
1389 | } |
1390 | } |
1391 | yfitter.Eval(); |
1392 | Double_t y0 = yfitter.GetFunctionParameter(0); |
1393 | Double_t dydx = yfitter.GetFunctionParameter(1); |
1394 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); |
1395 | |
1396 | //update track points array |
1397 | if(np && points){ |
1398 | Float_t xyz[3]; |
1399 | for(int ip=0; ip<np; ip++){ |
1400 | points[ip].GetXYZ(xyz); |
1401 | xyz[1] = y0 + dydx * (xyz[0] - xref); |
1402 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1403 | points[ip].SetXYZ(xyz); |
1404 | } |
1405 | } |
1406 | return chi2; |
1407 | } |
1408 | |
1409 | |
3b57a3f7 |
1410 | //_________________________________________________________________________ |
6e4d4425 |
1411 | Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
3b57a3f7 |
1412 | { |
0fa1a8ee |
1413 | // |
1414 | // Performs a Riemann fit taking tilting pad correction into account |
1415 | // |
1416 | // Paramters: - Array of tracklets (connected to the track candidate) |
1417 | // - Flag selecting the error definition |
1418 | // Output: - Chi2 values of the track (in Parameter list) |
1419 | // |
1420 | // The equations which has to be solved simultaneously are: |
1421 | // BEGIN_LATEX |
1422 | // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2} |
1423 | // y^{*} = y - tg(h)(z - z_{t}) |
1424 | // z_{t} = z_{0}+dzdx*(x-x_{r}) |
1425 | // END_LATEX |
1426 | // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle, |
1427 | // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the |
1428 | // track in the x-z plane. Using the following transformations |
1429 | // BEGIN_LATEX |
1430 | // t = 1 / (x^{2} + y^{2}) |
1431 | // u = 2 * x * t |
1432 | // v = 2 * tan(h) * t |
1433 | // w = 2 * tan(h) * (x - x_{r}) * t |
1434 | // END_LATEX |
1435 | // One gets the following linear equation |
1436 | // BEGIN_LATEX |
1437 | // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t |
1438 | // END_LATEX |
1439 | // where the coefficients have the following meaning |
1440 | // BEGIN_LATEX |
1441 | // a = -1/y_{0} |
1442 | // b = x_{0}/y_{0} |
1443 | // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0} |
1444 | // d = z_{0} |
1445 | // e = dz/dx |
1446 | // END_LATEX |
1447 | // The error calculation for the free term is thus |
1448 | // BEGIN_LATEX |
1449 | // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t |
1450 | // END_LATEX |
1451 | // |
1452 | // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according |
1453 | // to the formula: |
1454 | // BEGIN_LATEX |
1455 | // C = 1/R = a/(1 + b^{2} + c*a) |
1456 | // END_LATEX |
1457 | // |
1458 | // Authors |
1459 | // M.Ivanov <M.Ivanov@gsi.de> |
1460 | // A.Bercuci <A.Bercuci@gsi.de> |
1461 | // M.Fasel <M.Fasel@gsi.de> |
1462 | |
41702fec |
1463 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1464 | fitter->StoreData(kTRUE); |
1465 | fitter->ClearPoints(); |
1466 | AliTRDLeastSquare zfitter; |
4d6aee34 |
1467 | AliTRDcluster *cl = NULL; |
3b57a3f7 |
1468 | |
4d6aee34 |
1469 | AliTRDseedV1 work[kNPlanes], *tracklet = NULL; |
3b57a3f7 |
1470 | if(!tracklets){ |
1471 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1472 | if(!(tracklet = track->GetTracklet(ipl))) continue; |
1473 | if(!tracklet->IsOK()) continue; |
1474 | new(&work[ipl]) AliTRDseedV1(*tracklet); |
1475 | } |
1476 | tracklets = &work[0]; |
1477 | } |
1478 | |
41702fec |
1479 | Double_t xref = CalculateReferenceX(tracklets); |
1480 | Double_t x, y, z, t, tilt, dx, w, we; |
1481 | Double_t uvt[4]; |
1482 | Int_t nPoints = 0; |
1483 | // Containers for Least-square fitter |
1484 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1485 | if(!tracklets[ipl].IsOK()) continue; |
8d2bec9e |
1486 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec |
1487 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1488 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1489 | x = cl->GetX(); |
1490 | y = cl->GetY(); |
1491 | z = cl->GetZ(); |
1492 | tilt = tracklets[ipl].GetTilt(); |
1493 | dx = x - xref; |
1494 | // Transformation |
1495 | t = 1./(x*x + y*y); |
1496 | uvt[0] = 2. * x * t; |
1497 | uvt[1] = t; |
1498 | uvt[2] = 2. * tilt * t; |
1499 | uvt[3] = 2. * tilt * dx * t; |
1500 | w = 2. * (y + tilt*z) * t; |
1501 | // error definition changes for the different calls |
1502 | we = 2. * t; |
f29f13a6 |
1503 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec |
1504 | fitter->AddPoint(uvt, w, we); |
1505 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
1506 | nPoints++; |
1507 | } |
1508 | } |
aec26713 |
1509 | if(fitter->Eval()) return 1.E10; |
1510 | |
41702fec |
1511 | Double_t z0 = fitter->GetParameter(3); |
1512 | Double_t dzdx = fitter->GetParameter(4); |
3b57a3f7 |
1513 | |
1514 | |
1515 | // Linear fitter - not possible to make boundaries |
1516 | // Do not accept non possible z and dzdx combinations |
1517 | Bool_t accept = kTRUE; |
1518 | Double_t zref = 0.0; |
1519 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
1520 | if(!tracklets[iLayer].IsOK()) continue; |
1521 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); |
e3cf3d02 |
1522 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
3b57a3f7 |
1523 | accept = kFALSE; |
1524 | } |
1525 | if (!accept) { |
41702fec |
1526 | zfitter.Eval(); |
3b57a3f7 |
1527 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1528 | Double_t zmf = zfitter.GetFunctionValue(&xref); |
1529 | fitter->FixParameter(3, zmf); |
1530 | fitter->FixParameter(4, dzmf); |
e17f4785 |
1531 | fitter->Eval(); |
3b57a3f7 |
1532 | fitter->ReleaseParameter(3); |
1533 | fitter->ReleaseParameter(4); |
1534 | z0 = fitter->GetParameter(3); // = zmf ? |
1535 | dzdx = fitter->GetParameter(4); // = dzmf ? |
1536 | } |
1537 | |
1538 | // Calculate Curvature |
1539 | Double_t a = fitter->GetParameter(0); |
1540 | Double_t b = fitter->GetParameter(1); |
1541 | Double_t c = fitter->GetParameter(2); |
1542 | Double_t y0 = 1. / a; |
1543 | Double_t x0 = -b * y0; |
a015e406 |
1544 | Double_t tmp = y0*y0 + x0*x0 - c*y0; |
1545 | if(tmp<=0.) return 1.E10; |
4d6aee34 |
1546 | Double_t radius = TMath::Sqrt(tmp); |
1547 | Double_t curvature = 1.0 + b*b - c*a; |
1548 | if (curvature > 0.0) curvature = a / TMath::Sqrt(curvature); |
3b57a3f7 |
1549 | |
1550 | // Calculate chi2 of the fit |
1551 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); |
1552 | |
1553 | // Update the tracklets |
1554 | if(!track){ |
1555 | for(Int_t ip = 0; ip < kNPlanes; ip++) { |
1556 | x = tracklets[ip].GetX0(); |
4d6aee34 |
1557 | tmp = radius*radius-(x-x0)*(x-x0); |
a015e406 |
1558 | if(tmp <= 0.) continue; |
1559 | tmp = TMath::Sqrt(tmp); |
3b57a3f7 |
1560 | |
1561 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1562 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) |
1563 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); |
1564 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) |
1565 | tracklets[ip].SetYref(1, (x - x0) / tmp); |
1566 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); |
1567 | tracklets[ip].SetZref(1, dzdx); |
4d6aee34 |
1568 | tracklets[ip].SetC(curvature); |
3b57a3f7 |
1569 | tracklets[ip].SetChi2(chi2); |
1570 | } |
1571 | } |
3b57a3f7 |
1572 | //update track points array |
1573 | if(np && points){ |
1574 | Float_t xyz[3]; |
1575 | for(int ip=0; ip<np; ip++){ |
1576 | points[ip].GetXYZ(xyz); |
4d6aee34 |
1577 | 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 |
1578 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1579 | points[ip].SetXYZ(xyz); |
1580 | } |
1581 | } |
1582 | |
3b57a3f7 |
1583 | return chi2; |
1584 | } |
1585 | |
1586 | |
1bf51039 |
1587 | //____________________________________________________________________ |
e17f4785 |
1588 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 * const tracklets, Bool_t up, Int_t np, AliTrackPoint *points) |
1bf51039 |
1589 | { |
1590 | // Kalman filter implementation for the TRD. |
1591 | // It returns the positions of the fit in the array "points" |
1592 | // |
1593 | // Author : A.Bercuci@gsi.de |
1594 | |
3cfaffa4 |
1595 | // printf("Start track @ x[%f]\n", track->GetX()); |
1bf51039 |
1596 | |
1597 | //prepare marker points along the track |
1598 | Int_t ip = np ? 0 : 1; |
1599 | while(ip<np){ |
1600 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; |
1601 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); |
1602 | ip++; |
1603 | } |
1604 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); |
1605 | |
1606 | |
4d6aee34 |
1607 | AliTRDseedV1 tracklet, *ptrTracklet = NULL; |
1bf51039 |
1608 | |
1609 | //Loop through the TRD planes |
1610 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { |
1611 | // GET TRACKLET OR BUILT IT |
1612 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; |
1613 | if(tracklets){ |
e17f4785 |
1614 | if(!(ptrTracklet = &tracklets[iplane])) continue; |
1bf51039 |
1615 | }else{ |
1616 | if(!(ptrTracklet = track->GetTracklet(iplane))){ |
4d6aee34 |
1617 | /*AliTRDtrackerV1 *tracker = NULL; |
a2fbb6ec |
1618 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDrecoParam:Tracker()))) continue; |
1bf51039 |
1619 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); |
1620 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ |
1621 | continue; |
1622 | } |
1623 | } |
1624 | if(!ptrTracklet->IsOK()) continue; |
1625 | |
1626 | Double_t x = ptrTracklet->GetX0(); |
1627 | |
1628 | while(ip < np){ |
1629 | //don't do anything if next marker is after next update point. |
1630 | if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break; |
1bf51039 |
1631 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1632 | |
1633 | Double_t xyz[3]; // should also get the covariance |
3cfaffa4 |
1634 | track->GetXYZ(xyz); |
1635 | track->Global2LocalPosition(xyz, track->GetAlpha()); |
1636 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); |
1bf51039 |
1637 | ip++; |
1638 | } |
3cfaffa4 |
1639 | // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1bf51039 |
1640 | |
3cfaffa4 |
1641 | // Propagate closer to the next update point |
1bf51039 |
1642 | if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.; |
1643 | |
1644 | if(!AdjustSector(track)) return -1; |
1645 | if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1; |
1646 | |
1647 | //load tracklet to the tracker and the track |
1648 | /* Int_t index; |
1649 | if((index = FindTracklet(ptrTracklet)) < 0){ |
1650 | ptrTracklet = SetTracklet(&tracklet); |
1651 | index = fTracklets->GetEntriesFast()-1; |
1652 | } |
1653 | track->SetTracklet(ptrTracklet, index);*/ |
1654 | |
1655 | |
1656 | // register tracklet to track with tracklet creation !! |
1657 | // PropagateBack : loaded tracklet to the tracker and update index |
1658 | // RefitInward : update index |
1659 | // MakeTrack : loaded tracklet to the tracker and update index |
1660 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); |
1661 | |
1662 | |
1663 | //Calculate the mean material budget along the path inside the chamber |
1664 | Double_t xyz0[3]; track->GetXYZ(xyz0); |
1665 | Double_t alpha = track->GetAlpha(); |
1666 | Double_t xyz1[3], y, z; |
1667 | if(!track->GetProlongation(x, y, z)) return -1; |
1668 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
1669 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
1670 | xyz1[2] = z; |
3cfaffa4 |
1671 | if((xyz0[0] - xyz1[9] < 1e-3) && (xyz0[0] - xyz1[9] < 1e-3)) continue; // check wheter we are at the same global x position |
1bf51039 |
1672 | Double_t param[7]; |
3cfaffa4 |
1673 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break; |
1bf51039 |
1674 | Double_t xrho = param[0]*param[4]; // density*length |
1675 | Double_t xx0 = param[1]; // radiation length |
1676 | |
1677 | //Propagate the track |
1678 | track->PropagateTo(x, xx0, xrho); |
1679 | if (!AdjustSector(track)) break; |
1680 | |
1681 | //Update track |
b72f4eaf |
1682 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
1683 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; |
1684 | Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov); |
1685 | if(chi2<1e+10) track->Update(p, cov, chi2); |
1bf51039 |
1686 | if(!up) continue; |
1687 | |
1688 | //Reset material budget if 2 consecutive gold |
1689 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); |
1690 | } // end planes loop |
1691 | |
1692 | // extrapolation |
1693 | while(ip < np){ |
1694 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1695 | |
1696 | Double_t xyz[3]; // should also get the covariance |
3cfaffa4 |
1697 | track->GetXYZ(xyz); |
1698 | track->Global2LocalPosition(xyz, track->GetAlpha()); |
1699 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); |
1bf51039 |
1700 | ip++; |
1701 | } |
1702 | |
1703 | return track->GetChi2(); |
1704 | } |
3b57a3f7 |
1705 | |
eb38ed55 |
1706 | //_________________________________________________________________________ |
bb56afff |
1707 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 |
1708 | { |
41702fec |
1709 | // |
1710 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. |
1711 | // A linear dependence on the x-value serves as a model. |
1712 | // The parameters are related to the tilted Riemann fit. |
1713 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate |
1714 | // - the offset for the reference x |
1715 | // - the slope |
1716 | // - the reference x position |
1717 | // Output: - The Chi2 value of the track in z-Direction |
1718 | // |
1719 | Float_t chi2Z = 0, nLayers = 0; |
053767a4 |
1720 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec |
1721 | if(!tracklets[iLayer].IsOK()) continue; |
1722 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); |
e3cf3d02 |
1723 | chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z); |
41702fec |
1724 | nLayers++; |
1725 | } |
1726 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); |
1727 | return chi2Z; |
eb38ed55 |
1728 | } |
1729 | |
bccda319 |
1730 | //_____________________________________________________________________________ |
1731 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) |
1732 | { |
41702fec |
1733 | // |
1734 | // Starting from current X-position of track <t> this function |
1735 | // extrapolates the track up to radial position <xToGo>. |
1736 | // Returns 1 if track reaches the plane, and 0 otherwise |
1737 | // |
bccda319 |
1738 | |
41702fec |
1739 | const Double_t kEpsilon = 0.00001; |
bccda319 |
1740 | |
41702fec |
1741 | // Current track X-position |
1742 | Double_t xpos = t.GetX(); |
bccda319 |
1743 | |
41702fec |
1744 | // Direction: inward or outward |
1745 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; |
bccda319 |
1746 | |
41702fec |
1747 | while (((xToGo - xpos) * dir) > kEpsilon) { |
bccda319 |
1748 | |
41702fec |
1749 | Double_t xyz0[3]; |
1750 | Double_t xyz1[3]; |
1751 | Double_t param[7]; |
1752 | Double_t x; |
1753 | Double_t y; |
1754 | Double_t z; |
bccda319 |
1755 | |
41702fec |
1756 | // The next step size |
1757 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); |
bccda319 |
1758 | |
41702fec |
1759 | // Get the global position of the starting point |
1760 | t.GetXYZ(xyz0); |
bccda319 |
1761 | |
41702fec |
1762 | // X-position after next step |
1763 | x = xpos + step; |
bccda319 |
1764 | |
41702fec |
1765 | // Get local Y and Z at the X-position of the next step |
3352b455 |
1766 | if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible |
bccda319 |
1767 | |
41702fec |
1768 | // The global position of the end point of this prolongation step |
1769 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); |
1770 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); |
1771 | xyz1[2] = z; |
bccda319 |
1772 | |
41702fec |
1773 | // Calculate the mean material budget between start and |
1774 | // end point of this prolongation step |
83dea92e |
1775 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0; |
bccda319 |
1776 | |
41702fec |
1777 | // Propagate the track to the X-position after the next step |
9c87a076 |
1778 | if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0; |
bccda319 |
1779 | |
41702fec |
1780 | // Rotate the track if necessary |
1781 | AdjustSector(&t); |
bccda319 |
1782 | |
41702fec |
1783 | // New track X-position |
1784 | xpos = t.GetX(); |
bccda319 |
1785 | |
41702fec |
1786 | } |
bccda319 |
1787 | |
41702fec |
1788 | return 1; |
bccda319 |
1789 | |
1790 | } |
1791 | |
eb38ed55 |
1792 | |
1793 | //_____________________________________________________________________________ |
1794 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const |
1795 | { |
41702fec |
1796 | // |
1797 | // Reads AliTRDclusters from the file. |
1798 | // The names of the cluster tree and branches |
1799 | // should match the ones used in AliTRDclusterizer::WriteClusters() |
1800 | // |
1801 | |
1802 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); |
1803 | TObjArray *clusterArray = new TObjArray(nsize+1000); |
1804 | |
1805 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); |
1806 | if (!branch) { |
1807 | AliError("Can't get the branch !"); |
1808 | return 1; |
1809 | } |
1810 | branch->SetAddress(&clusterArray); |
1811 | |
1812 | if(!fClusters){ |
4d6aee34 |
1813 | Float_t nclusters = fkReconstructor->GetRecoParam()->GetNClusters(); |
1814 | if(fkReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector; |
8ae98148 |
1815 | array = new TClonesArray("AliTRDcluster", Int_t(nclusters)); |
41702fec |
1816 | array->SetOwner(kTRUE); |
1817 | } |
1818 | |
1819 | // Loop through all entries in the tree |
1820 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); |
1821 | Int_t nbytes = 0; |
1822 | Int_t ncl = 0; |
4d6aee34 |
1823 | AliTRDcluster *c = NULL; |
41702fec |
1824 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { |
1825 | // Import the tree |
1826 | nbytes += clusterTree->GetEvent(iEntry); |
1827 | |
1828 | // Get the number of points in the detector |
1829 | Int_t nCluster = clusterArray->GetEntriesFast(); |
1830 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { |
1831 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; |
41702fec |
1832 | new((*fClusters)[ncl++]) AliTRDcluster(*c); |
1833 | delete (clusterArray->RemoveAt(iCluster)); |
1834 | } |
1835 | |
1836 | } |
1837 | delete clusterArray; |
1838 | |
1839 | return 0; |
eb38ed55 |
1840 | } |
1841 | |
1842 | //_____________________________________________________________________________ |
1843 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) |
1844 | { |
41702fec |
1845 | // |
66f6bfd9 |
1846 | // Fills clusters into TRD tracking sectors |
41702fec |
1847 | // |
41702fec |
1848 | |
4d6aee34 |
1849 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 |
1850 | fClusters = AliTRDReconstructor::GetClusters(); |
1851 | } else { |
66f6bfd9 |
1852 | if (ReadClusters(fClusters, cTree)) { |
1853 | AliError("Problem with reading the clusters !"); |
1854 | return 1; |
1855 | } |
1856 | } |
1857 | SetClustersOwner(); |
1858 | |
48f8adf3 |
1859 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 |
1860 | AliInfo("No TRD clusters"); |
41702fec |
1861 | return 1; |
1862 | } |
66f6bfd9 |
1863 | |
1864 | //Int_t nin = |
1865 | BuildTrackingContainers(); |
1866 | |
1867 | //Int_t ncl = fClusters->GetEntriesFast(); |
1868 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); |
1869 | |
1870 | return 0; |
1871 | } |
1872 | |
1873 | //_____________________________________________________________________________ |
4d6aee34 |
1874 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray * const clusters) |
66f6bfd9 |
1875 | { |
1876 | // |
1877 | // Fills clusters into TRD tracking sectors |
1878 | // Function for use in the HLT |
1879 | |
1880 | if(!clusters || !clusters->GetEntriesFast()){ |
1881 | AliInfo("No TRD clusters"); |
41702fec |
1882 | return 1; |
1883 | } |
1884 | |
66f6bfd9 |
1885 | fClusters = clusters; |
1886 | SetClustersOwner(); |
1887 | |
1888 | //Int_t nin = |
1889 | BuildTrackingContainers(); |
1890 | |
1891 | //Int_t ncl = fClusters->GetEntriesFast(); |
1892 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); |
1893 | |
1894 | return 0; |
1895 | } |
1896 | |
1897 | |
1898 | //____________________________________________________________________ |
1899 | Int_t AliTRDtrackerV1::BuildTrackingContainers() |
1900 | { |
1901 | // Building tracking containers for clusters |
1902 | |
1903 | Int_t nin =0, icl = fClusters->GetEntriesFast(); |
41702fec |
1904 | while (icl--) { |
1905 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); |
1906 | if(c->IsInChamber()) nin++; |
1907 | Int_t detector = c->GetDetector(); |
1908 | Int_t sector = fGeom->GetSector(detector); |
053767a4 |
1909 | Int_t stack = fGeom->GetStack(detector); |
1910 | Int_t layer = fGeom->GetLayer(detector); |
41702fec |
1911 | |
053767a4 |
1912 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl); |
41702fec |
1913 | } |
b0a48c4d |
1914 | |
1915 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
053767a4 |
1916 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec |
1917 | if(!fTrSec[isector].GetNChambers()) continue; |
4d6aee34 |
1918 | fTrSec[isector].Init(fkReconstructor, cal); |
41702fec |
1919 | } |
66f6bfd9 |
1920 | |
1921 | return nin; |
eb38ed55 |
1922 | } |
1923 | |
1924 | |
66f6bfd9 |
1925 | |
0906e73e |
1926 | //____________________________________________________________________ |
172b6f82 |
1927 | void AliTRDtrackerV1::UnloadClusters() |
0906e73e |
1928 | { |
d4cf71ca |
1929 | // |
1930 | // Clears the arrays of clusters and tracks. Resets sectors and timebins |
1931 | // If option "force" is also set the containers are also deleted. This is useful |
1932 | // in case of HLT |
1933 | |
1934 | if(fTracks){ |
1935 | fTracks->Delete(); |
4d6aee34 |
1936 | if(HasRemoveContainers()){delete fTracks; fTracks = NULL;} |
d4cf71ca |
1937 | } |
1938 | if(fTracklets){ |
1939 | fTracklets->Delete(); |
4d6aee34 |
1940 | if(HasRemoveContainers()){delete fTracklets; fTracklets = NULL;} |
d4cf71ca |
1941 | } |
48f8adf3 |
1942 | if(fClusters){ |
1943 | if(IsClustersOwner()) fClusters->Delete(); |
1944 | |
1945 | // save clusters array in the reconstructor for further use. |
4d6aee34 |
1946 | if(!fkReconstructor->IsWritingClusters()){ |
48f8adf3 |
1947 | AliTRDReconstructor::SetClusters(fClusters); |
1948 | SetClustersOwner(kFALSE); |
4d6aee34 |
1949 | } else AliTRDReconstructor::SetClusters(NULL); |
48f8adf3 |
1950 | } |
0906e73e |
1951 | |
053767a4 |
1952 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e |
1953 | |
41702fec |
1954 | // Increment the Event Number |
1955 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); |
eb38ed55 |
1956 | } |
0906e73e |
1957 | |
fac58f00 |
1958 | // //____________________________________________________________________ |
1959 | // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const |
1960 | // { |
1961 | // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t); |
1962 | // if(!track) return; |
1963 | // |
4d6aee34 |
1964 | // AliTRDseedV1 *tracklet = NULL; |
fac58f00 |
1965 | // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){ |
1966 | // if(!(tracklet = track->GetTracklet(ily))) continue; |
4d6aee34 |
1967 | // AliTRDcluster *c = NULL; |
8d2bec9e |
1968 | // for(Int_t ic=AliTRDseed::kNclusters; ic--;){ |
fac58f00 |
1969 | // if(!(c=tracklet->GetClusters(ic))) continue; |
1970 | // c->Use(); |
1971 | // } |
1972 | // } |
1973 | // } |
1974 | // |
b1957d3c |
1975 | |
eb38ed55 |
1976 | //_____________________________________________________________________________ |
4d6aee34 |
1977 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *const track) |
eb38ed55 |
1978 | { |
41702fec |
1979 | // |
1980 | // Rotates the track when necessary |
1981 | // |
1982 | |
1983 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
1984 | Double_t y = track->GetY(); |
1985 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); |
3cfaffa4 |
1986 | |
41702fec |
1987 | if (y > ymax) { |
1988 | if (!track->Rotate( alpha)) { |
1989 | return kFALSE; |
1990 | } |
1991 | } |
1992 | else if (y < -ymax) { |
1993 | if (!track->Rotate(-alpha)) { |
1994 | return kFALSE; |
1995 | } |
1996 | } |
1997 | |
1998 | return kTRUE; |
0906e73e |
1999 | |
2000 | } |
2001 | |
eb38ed55 |
2002 | |
0906e73e |
2003 | //____________________________________________________________________ |
4d6aee34 |
2004 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *const track, Int_t p, Int_t &idx) |
0906e73e |
2005 | { |
41702fec |
2006 | // Find tracklet for TRD track <track> |
2007 | // Parameters |
2008 | // - track |
2009 | // - sector |
2010 | // - plane |
2011 | // - index |
2012 | // Output |
2013 | // tracklet |
2014 | // index |
2015 | // Detailed description |
2016 | // |
2017 | idx = track->GetTrackletIndex(p); |
4d6aee34 |
2018 | AliTRDseedV1 *tracklet = (idx==0xffff) ? NULL : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
41702fec |
2019 | |
2020 | return tracklet; |
0906e73e |
2021 | } |
2022 | |
2023 | //____________________________________________________________________ |
4d6aee34 |
2024 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(const AliTRDseedV1 * const tracklet) |
0906e73e |
2025 | { |
41702fec |
2026 | // Add this tracklet to the list of tracklets stored in the tracker |
2027 | // |
2028 | // Parameters |
2029 | // - tracklet : pointer to the tracklet to be added to the list |
2030 | // |
2031 | // Output |
2032 | // - the index of the new tracklet in the tracker tracklets list |
2033 | // |
2034 | // Detailed description |
2035 | // Build the tracklets list if it is not yet created (late initialization) |
2036 | // and adds the new tracklet to the list. |
2037 | // |
2038 | if(!fTracklets){ |
053767a4 |
2039 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec |
2040 | fTracklets->SetOwner(kTRUE); |
2041 | } |
2042 | Int_t nentries = fTracklets->GetEntriesFast(); |
2043 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); |
972ef65e |
2044 | } |
2045 | |
d20df6fc |
2046 | //____________________________________________________________________ |
4d6aee34 |
2047 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(const AliTRDtrackV1 * const track) |
d20df6fc |
2048 | { |
2049 | // Add this track to the list of tracks stored in the tracker |
2050 | // |
2051 | // Parameters |
2052 | // - track : pointer to the track to be added to the list |
2053 | // |
2054 | // Output |
2055 | // - the pointer added |
2056 | // |
2057 | // Detailed description |
2058 | // Build the tracks list if it is not yet created (late initialization) |
2059 | // and adds the new track to the list. |
2060 | // |
2061 | if(!fTracks){ |
053767a4 |
2062 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc |
2063 | fTracks->SetOwner(kTRUE); |
2064 | } |
2065 | Int_t nentries = fTracks->GetEntriesFast(); |
2066 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); |
2067 | } |
2068 | |
2069 | |
0906e73e |
2070 | |
e4f2f73d |
2071 | //____________________________________________________________________ |
eb38ed55 |
2072 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d |
2073 | { |
41702fec |
2074 | // |
2075 | // Steer tracking for one SM. |
2076 | // |
2077 | // Parameters : |
2078 | // sector : Array of (SM) propagation layers containing clusters |
2079 | // esd : The current ESD event. On output it contains the also |
2080 | // the ESD (TRD) tracks found in this SM. |
2081 | // |
2082 | // Output : |
2083 | // Number of tracks found in this TRD supermodule. |
2084 | // |
2085 | // Detailed description |
2086 | // |
2087 | // 1. Unpack AliTRDpropagationLayers objects for each stack. |
2088 | // 2. Launch stack tracking. |
2089 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. |
2090 | // 3. Pack results in the ESD event. |
2091 | // |
2092 | |
2093 | // allocate space for esd tracks in this SM |
2094 | TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack); |
2095 | esdTrackList.SetOwner(); |
2096 | |
2097 | Int_t nTracks = 0; |
2098 | Int_t nChambers = 0; |
4d6aee34 |
2099 | AliTRDtrackingChamber **stack = NULL, *chamber = NULL; |
053767a4 |
2100 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec |
2101 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
2102 | nChambers = 0; |
053767a4 |
2103 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
2104 | if(!(chamber = stack[ilayer])) continue; |
4d6aee34 |
2105 | if(chamber->GetNClusters() < fgNTimeBins * fkReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec |
2106 | nChambers++; |
053767a4 |
2107 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec |
2108 | } |
2109 | if(nChambers < 4) continue; |
2110 | //AliInfo(Form("Doing stack %d", istack)); |
2111 | nTracks += Clusters2TracksStack(stack, &esdTrackList); |
2112 | } |
2113 | //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks())); |
2114 | |
2115 | for(int itrack=0; itrack<nTracks; itrack++) |
2116 | esd->AddTrack((AliESDtrack*)esdTrackList[itrack]); |
2117 | |
2118 | // Reset Track and Candidate Number |
2119 | AliTRDtrackerDebug::SetCandidateNumber(0); |
2120 | AliTRDtrackerDebug::SetTrackNumber(0); |
2121 | return nTracks; |
e4f2f73d |
2122 | } |
2123 | |
2124 | //____________________________________________________________________ |
4d6aee34 |
2125 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray * const esdTrackList) |
e4f2f73d |
2126 | { |
41702fec |
2127 | // |
2128 | // Make tracks in one TRD stack. |
2129 | // |
2130 | // Parameters : |
2131 | // layer : Array of stack propagation layers containing clusters |
2132 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. |
2133 | // On exit the tracks found in this stack are appended. |
2134 | // |
2135 | // Output : |
2136 | // Number of tracks found in this stack. |
2137 | // |
2138 | // Detailed description |
2139 | // |
2140 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. |
2141 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. |
2142 | // See AliTRDtrackerV1::MakeSeeds() for more details. |
2143 | // 3. Arrange track candidates in decreasing order of their quality |
2144 | // 4. Classify tracks in 5 categories according to: |
2145 | // a) number of layers crossed |
2146 | // b) track quality |
2147 | // 5. Sign clusters by tracks in decreasing order of track quality |
2148 | // 6. Build AliTRDtrack out of seeding tracklets |
2149 | // 7. Cook MC label |
2150 | // 8. Build ESD track and register it to the output list |
2151 | // |
2152 | |
b0a48c4d |
2153 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
4d6aee34 |
2154 | AliTRDtrackingChamber *chamber = NULL; |
2155 | AliTRDtrackingChamber **ci = NULL; |
41702fec |
2156 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
2157 | Int_t pars[4]; // MakeSeeds parameters |
2158 | |
2159 | //Double_t alpha = AliTRDgeometry::GetAlpha(); |
2160 | //Double_t shift = .5 * alpha; |
2161 | Int_t configs[kNConfigs]; |
2162 | |
fac58f00 |
2163 | // Purge used clusters from the containers |
2164 | ci = &stack[0]; |
2165 | for(Int_t ic = kNPlanes; ic--; ci++){ |
2166 | if(!(*ci)) continue; |
2167 | (*ci)->Update(); |
2168 | } |
2169 | |
41702fec |
2170 | // Build initial seeding configurations |
2171 | Double_t quality = BuildSeedingConfigs(stack, configs); |
a2fbb6ec |
2172 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){ |
41702fec |
2173 | AliInfo(Form("Plane config %d %d %d Quality %f" |
2174 | , configs[0], configs[1], configs[2], quality)); |
2175 | } |
d931f2aa |
2176 | |
41702fec |
2177 | |
2178 | // Initialize contors |
2179 | Int_t ntracks, // number of TRD track candidates |
2180 | ntracks1, // number of registered TRD tracks/iter |
2181 | ntracks2 = 0; // number of all registered TRD tracks in stack |
2182 | fSieveSeeding = 0; |
d931f2aa |
2183 | |
2184 | // Get stack index |
fac58f00 |
2185 | Int_t ic = 0; ci = &stack[0]; |
2186 | while(ic<kNPlanes && !(*ci)){ic++; ci++;} |
2187 | if(!(*ci)) return ntracks2; |
2188 | Int_t istack = fGeom->GetStack((*ci)->GetDetector()); |
d931f2aa |
2189 | |
41702fec |
2190 | do{ |
2191 | // Loop over seeding configurations |
2192 | ntracks = 0; ntracks1 = 0; |
2193 | for (Int_t iconf = 0; iconf<3; iconf++) { |
2194 | pars[0] = configs[iconf]; |
2195 | pars[1] = ntracks; |
d931f2aa |
2196 | pars[2] = istack; |
41702fec |
2197 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
6e39bde4 |
2198 | //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks)); |
41702fec |
2199 | if(ntracks == kMaxTracksStack) break; |
2200 | } |
a2fbb6ec |
2201 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec |
2202 | |
2203 | if(!ntracks) break; |
2204 | |
2205 | // Sort the seeds according to their quality |
2206 | Int_t sort[kMaxTracksStack]; |
2207 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); |
2208 | |
2209 | // Initialize number of tracks so far and logic switches |
2210 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); |
2211 | Bool_t signedTrack[kMaxTracksStack]; |
2212 | Bool_t fakeTrack[kMaxTracksStack]; |
2213 | for (Int_t i=0; i<ntracks; i++){ |
2214 | signedTrack[i] = kFALSE; |
2215 | fakeTrack[i] = kFALSE; |
2216 | } |
2217 | //AliInfo("Selecting track candidates ..."); |
2218 | |
2219 | // Sieve clusters in decreasing order of track quality |
2220 | Double_t trackParams[7]; |
4d6aee34 |
2221 | // AliTRDseedV1 *lseed = NULL; |
41702fec |
2222 | Int_t jSieve = 0, candidates; |
2223 | do{ |
2224 | //AliInfo(Form("\t\tITER = %i ", jSieve)); |
2225 | |
2226 | // Check track candidates |
2227 | candidates = 0; |
2228 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { |
804bb02e |
2229 | Int_t trackIndex = sort[itrack]; |
2230 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; |
41702fec |
2231 | |
2232 | |
804bb02e |
2233 | // Calculate track parameters from tracklets seeds |
804bb02e |
2234 | Int_t ncl = 0; |
2235 | Int_t nused = 0; |
2236 | Int_t nlayers = 0; |
2237 | Int_t findable = 0; |
2238 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { |
2239 | Int_t jseed = kNPlanes*trackIndex+jLayer; |
2240 | if(!sseed[jseed].IsOK()) continue; |
f29f13a6 |
2241 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++; |
eede7907 |
2242 | // TODO here we get a sig fault which should never happen ! |
804bb02e |
2243 | sseed[jseed].UpdateUsed(); |
2244 | ncl += sseed[jseed].GetN2(); |
2245 | nused += sseed[jseed].GetNUsed(); |
2246 | nlayers++; |
804bb02e |
2247 | } |
2248 | |
f29f13a6 |
2249 | // Filter duplicated tracks |
2250 | if (nused > 30){ |
2251 | //printf("Skip %d nused %d\n", trackIndex, nused); |
2252 | fakeTrack[trackIndex] = kTRUE; |
2253 | continue; |
2254 | } |
2255 | if (Float_t(nused)/ncl >= .25){ |
2256 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); |
2257 | fakeTrack[trackIndex] = kTRUE; |
2258 | continue; |
2259 | } |
41702fec |
2260 | |
f29f13a6 |
2261 | // Classify tracks |
2262 | Bool_t skip = kFALSE; |
2263 | switch(jSieve){ |
2264 | case 0: |
2265 | if(nlayers < 6) {skip = kTRUE; break;} |
2266 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
2267 | break; |
2268 | |
2269 | case 1: |
2270 | if(nlayers < findable){skip = kTRUE; break;} |
2271 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} |
2272 | break; |
2273 | |
2274 | case 2: |
2275 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} |
2276 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} |
2277 | break; |
2278 | |
2279 | case 3: |
2280 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
2281 | break; |
2282 | |
2283 | case 4: |
2284 | if (nlayers == 3){skip = kTRUE; break;} |
2285 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} |
2286 | break; |
2287 | } |
2288 | if(skip){ |
2289 | candidates++; |
2290 | //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused); |
2291 | continue; |
2292 | } |
2293 | signedTrack[trackIndex] = kTRUE; |
2294 | |
2295 | // Build track parameters |
2296 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; |
2297 | /* Int_t idx = 0; |
2298 | while(idx<3 && !lseed->IsOK()) { |
2299 | idx++; |
2300 | lseed++; |
2301 | }*/ |
2302 | Double_t x = lseed->GetX0();// - 3.5; |
2303 | trackParams[0] = x; //NEW AB |
2304 | trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x); |
2305 | trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x); |
2306 | trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1))); |
2307 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); |
2308 | trackParams[5] = lseed->GetC(); |
2309 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; |
2310 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ |
2311 | |
a2fbb6ec |
2312 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 1 && fkReconstructor->IsDebugStreaming()){ |
eb2b4f91 |
2313 | //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); |
f29f13a6 |
2314 | |
f29f13a6 |
2315 | AliTRDseedV1 *dseed[6]; |
b82b4de1 |
2316 | for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]); |
f29f13a6 |
2317 | |
2318 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); |
f29f13a6 |
2319 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2320 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); |
2321 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
a2fbb6ec |
2322 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
f29f13a6 |
2323 | cstreamer << "Clusters2TracksStack" |
2324 | << "EventNumber=" << eventNumber |
2325 | << "TrackNumber=" << trackNumber |
2326 | << "CandidateNumber=" << candidateNumber |
2327 | << "Iter=" << fSieveSeeding |
2328 | << "Like=" << fTrackQuality[trackIndex] |
2329 | << "S0.=" << dseed[0] |
2330 | << "S1.=" << dseed[1] |
2331 | << "S2.=" << dseed[2] |
2332 | << "S3.=" << dseed[3] |
2333 | << "S4.=" << dseed[4] |
2334 | << "S5.=" << dseed[5] |
2335 | << "p0=" << trackParams[0] |
2336 | << "p1=" << trackParams[1] |
2337 | << "p2=" << trackParams[2] |
2338 | << "p3=" << trackParams[3] |
2339 | << "p4=" << trackParams[4] |
2340 | << "p5=" << trackParams[5] |
2341 | << "p6=" << trackParams[6] |
f29f13a6 |
2342 | << "Ncl=" << ncl |
2343 | << "NLayers=" << nlayers |
2344 | << "Findable=" << findable |
2345 | << "NUsed=" << nused |
2346 | << "\n"; |
2347 | } |
d877f55f |
2348 | |
f29f13a6 |
2349 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
2350 | if(!track){ |
2351 | AliWarning("Fail to build a TRD Track."); |
2352 | continue; |
d877f55f |
2353 | } |
41702fec |
2354 | |
f29f13a6 |
2355 | //AliInfo("End of MakeTrack()"); |
2356 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); |
2357 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); |
2358 | esdTrack->SetLabel(track->GetLabel()); |
2359 | track->UpdateESDtrack(esdTrack); |
2360 | // write ESD-friends if neccessary |
a2fbb6ec |
2361 | if (fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 0){ |
f29f13a6 |
2362 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); |
2363 | calibTrack->SetOwner(); |
2364 | esdTrack->AddCalibObject(calibTrack); |
2365 | } |
2366 | ntracks1++; |
2367 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); |
41702fec |
2368 | } |
2369 | |
2370 | jSieve++; |
2371 | } while(jSieve<5 && candidates); // end track candidates sieve |
2372 | if(!ntracks1) break; |
2373 | |
2374 | // increment counters |
2375 | ntracks2 += ntracks1; |
4302c900 |
2376 | |
4d6aee34 |
2377 | if(fkReconstructor->IsHLT()) break; |
41702fec |
2378 | fSieveSeeding++; |
2379 | |
2380 | // Rebuild plane configurations and indices taking only unused clusters into account |
2381 | quality = BuildSeedingConfigs(stack, configs); |
4d6aee34 |
2382 | if(quality < 1.E-7) break; //fkReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec |
2383 | |
2384 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
2385 | if(!(chamber = stack[ip])) continue; |
b0a48c4d |
2386 | chamber->Build(fGeom, cal);//Indices(fSieveSeeding); |
41702fec |
2387 | } |
2388 | |
a2fbb6ec |
2389 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 10){ |
41702fec |
2390 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2391 | } |
2392 | } while(fSieveSeeding<10); // end stack clusters sieve |
2393 | |
2394 | |
2395 | |
2396 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); |
2397 | |
2398 | return ntracks2; |
e4f2f73d |
2399 | } |
2400 | |
2401 | //___________________________________________________________________ |
eb38ed55 |
2402 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d |
2403 | { |
41702fec |
2404 | // |
2405 | // Assign probabilities to chambers according to their |
2406 | // capability of producing seeds. |
2407 | // |
2408 | // Parameters : |
2409 | // |
2410 | // layers : Array of stack propagation layers for all 6 chambers in one stack |
2411 | // configs : On exit array of configuration indexes (see GetSeedingConfig() |
2412 | // for details) in the decreasing order of their seeding probabilities. |
2413 | // |
2414 | // Output : |
2415 | // |
2416 | // Return top configuration quality |
2417 | // |
2418 | // Detailed description: |
2419 | // |
2420 | // To each chamber seeding configuration (see GetSeedingConfig() for |
2421 | // the list of all configurations) one defines 2 quality factors: |
2422 | // - an apriori topological quality (see GetSeedingConfig() for details) and |
2423 | // - a data quality based on the uniformity of the distribution of |
2424 | // clusters over the x range (time bins population). See CookChamberQA() for details. |
2425 | // The overall chamber quality is given by the product of this 2 contributions. |
2426 | // |
2427 | |
eb2b4f91 |
2428 | Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t)); |
4d6aee34 |
2429 | AliTRDtrackingChamber *chamber = NULL; |
41702fec |
2430 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2431 | if(!(chamber = stack[iplane])) continue; |
2432 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; |
2433 | } |
2434 | |
eb2b4f91 |
2435 | Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t)); |
2436 | Int_t planes[] = {0, 0, 0, 0}; |
41702fec |
2437 | for(int iconf=0; iconf<kNConfigs; iconf++){ |
2438 | GetSeedingConfig(iconf, planes); |
2439 | tconfig[iconf] = fgTopologicQA[iconf]; |
2440 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; |
2441 | } |
2442 | |
2443 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); |
2444 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); |
2445 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); |
2446 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); |
2447 | |
2448 | return tconfig[configs[0]]; |
e4f2f73d |
2449 | } |
2450 | |
2451 | //____________________________________________________________________ |
e17f4785 |
2452 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 * const sseed, const Int_t * const ipar) |
e4f2f73d |
2453 | { |
afa21247 |
2454 | // |
2a3191bb |
2455 | // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are |
2456 | // either missed by TPC prolongation or conversions inside the TRD volume. |
2457 | // For stand alone tracking the procedure is used to estimate all tracks measured by TRD. |
afa21247 |
2458 | // |
2459 | // Parameters : |
2460 | // layers : Array of stack propagation layers containing clusters |
2461 | // sseed : Array of empty tracklet seeds. On exit they are filled. |
2462 | // ipar : Control parameters: |
2463 | // ipar[0] -> seeding chambers configuration |
2464 | // ipar[1] -> stack index |
2465 | // ipar[2] -> number of track candidates found so far |
2466 | // |
2467 | // Output : |
2468 | // Number of tracks candidates found. |
2469 | // |
2470 | // The following steps are performed: |
2471 | // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the |
2472 | // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding |
2473 | // is described in AliTRDtrackerV1::Clusters2TracksStack(). |
2474 | // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm: |
2475 | // - for each seeding cluster in the lower seeding layer find |
2476 | // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle |
2477 | // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker. |
2478 | // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the |
2479 | // reco params |
2480 | // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three |
2481 | // seeding clusters. |
2482 | // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond() |
2483 | // and AliTRDchamberTimeBin::GetClusters(). |
2484 | // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is |
2485 | // performed at this level |
2486 | // 4. Initialize seeding tracklets in the seeding chambers. |
2487 | // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params. |
2488 | // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see |
2489 | // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25). |
2490 | // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed. |
2491 | // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new |
2492 | // approximation of the track. |
2493 | // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are |
2494 | // checked against the Riemann fit: |
2495 | // - position resolution in y |
2496 | // - angular resolution in the bending plane |
2497 | // - likelihood of the number of clusters attached to the tracklet |
2498 | // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers: |
2499 | // - Initialization of extrapolation tracklets with the fit parameters |
2500 | // - Attach clusters to extrapolated tracklets |
2501 | // - Helix fit of tracklets |
2502 | // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track |
2503 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. |
2504 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation |
2505 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. |
2506 | // 14. Cooking labels for tracklets. Should be done only for MC |
2507 | // 15. Register seeds. |
2508 | // |
2509 | // Authors: |
2510 | // Marian Ivanov <M.Ivanov@gsi.de> |
2511 | // Alexandru Bercuci <A.Bercuci@gsi.de> |
2512 | // Markus Fasel <M.Fasel@gsi.de> |
41702fec |
2513 | |
4d6aee34 |
2514 | AliTRDtrackingChamber *chamber = NULL; |
2515 | AliTRDcluster *c[kNSeedPlanes] = {NULL, NULL, NULL, NULL}; // initilize seeding clusters |
e17f4785 |
2516 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track |
41702fec |
2517 | Int_t ncl, mcl; // working variable for looping over clusters |
2518 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; |
2519 | // chi2 storage |
2520 | // chi2[0] = tracklet chi2 on the Z direction |
2521 | // chi2[1] = tracklet chi2 on the R direction |
2522 | Double_t chi2[4]; |
2523 | |
afa21247 |
2524 | // this should be data member of AliTRDtrack TODO |
41702fec |
2525 | Double_t seedQuality[kMaxTracksStack]; |
2526 | |
2527 | // unpack control parameters |
2528 | Int_t config = ipar[0]; |
2529 | Int_t ntracks = ipar[1]; |
d931f2aa |
2530 | Int_t istack = ipar[2]; |
41702fec |
2531 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
afa21247 |
2532 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
be24510a |
2533 | |
2534 | |
41702fec |
2535 | // Init chambers geometry |
41702fec |
2536 | Double_t hL[kNPlanes]; // Tilting angle |
2537 | Float_t padlength[kNPlanes]; // pad lenghts |
dd8059a8 |
2538 | Float_t padwidth[kNPlanes]; // pad widths |
4d6aee34 |
2539 | AliTRDpadPlane *pp = NULL; |
41702fec |
2540 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2541 | pp = fGeom->GetPadPlane(iplane, istack); |
bb79ccd5 |
2542 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec |
2543 | padlength[iplane] = pp->GetLengthIPad(); |
dd8059a8 |
2544 | padwidth[iplane] = pp->GetWidthIPad(); |
41702fec |
2545 | } |
2546 | |
eb2b4f91 |
2547 | // Init anode wire position for chambers |
e165b64b |
2548 | Double_t x0[kNPlanes], // anode wire position |
eb2b4f91 |
2549 | driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length |
4d6aee34 |
2550 | TGeoHMatrix *matrix = NULL; |
eb2b4f91 |
2551 | Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.}; |
2552 | Double_t glb[] = {0., 0., 0.}; |
2553 | AliTRDtrackingChamber **cIter = &stack[0]; |
a3743898 |
2554 | for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){ |
eb2b4f91 |
2555 | if(!(*cIter)) continue; |
e165b64b |
2556 | if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){ |
2557 | continue; |
2558 | x0[iLayer] = fgkX0[iLayer]; |
2559 | } |
eb2b4f91 |
2560 | matrix->LocalToMaster(loc, glb); |
2561 | x0[iLayer] = glb[0]; |
2562 | } |
2563 | |
a2fbb6ec |
2564 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 2){ |
41702fec |
2565 | AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
2566 | } |
2567 | |
d931f2aa |
2568 | // Build seeding layers |
d611c74f |
2569 | ResetSeedTB(); |
41702fec |
2570 | Int_t nlayers = 0; |
41702fec |
2571 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2572 | if(!(chamber = stack[planes[isl]])) continue; |
4d6aee34 |
2573 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fkReconstructor)) continue; |
41702fec |
2574 | nlayers++; |
41702fec |
2575 | } |
eb2b4f91 |
2576 | if(nlayers < kNSeedPlanes) return ntracks; |
41702fec |
2577 | |
2578 | |
2579 | // Start finding seeds |
2580 | Double_t cond0[4], cond1[4], cond2[4]; |
2581 | Int_t icl = 0; |
d611c74f |
2582 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec |
2583 | if(!c[3]) continue; |
d611c74f |
2584 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2585 | fSeedTB[0]->GetClusters(cond0, index, ncl); |
41702fec |
2586 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2587 | Int_t jcl = 0; |
2588 | while(jcl<ncl) { |
d611c74f |
2589 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec |
2590 | if(!c[0]) continue; |
2591 | Double_t dx = c[3]->GetX() - c[0]->GetX(); |
afa21247 |
2592 | Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx; |
2593 | Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx; |
2594 | fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx); |
d611c74f |
2595 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); |
41702fec |
2596 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2597 | |
2598 | Int_t kcl = 0; |
2599 | while(kcl<mcl) { |
d611c74f |
2600 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2601 | if(!c[1]) continue; |
afa21247 |
2602 | fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx); |
d611c74f |
2603 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); |
2604 | //printf("Found c[1] candidate 2 %p\n", c[2]); |
2605 | if(!c[2]) continue; |
2606 | |
6e39bde4 |
2607 | //AliInfo("Seeding clusters found. Building seeds ..."); |
2608 | //for(Int_t i = 0; i < kNSeedPlanes; i++) printf("%i. coordinates: x = %6.3f, y = %6.3f, z = %6.3f\n", i, c[i]->GetX(), c[i]->GetY(), c[i]->GetZ()); |
d611c74f |
2609 | |
804bb02e |
2610 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec |
2611 | |
d611c74f |
2612 | FitRieman(c, chi2); |
2613 | |
d931f2aa |
2614 | AliTRDseedV1 *tseed = &cseed[0]; |
bb2db46c |
2615 | cIter = &stack[0]; |
2616 | for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){ |
2617 | Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1; |
eb2b4f91 |
2618 | tseed->SetDetector(det); |
43d6ad34 |
2619 | tseed->SetTilt(hL[iLayer]); |
2620 | tseed->SetPadLength(padlength[iLayer]); |
dd8059a8 |
2621 | tseed->SetPadWidth(padwidth[iLayer]); |
4d6aee34 |
2622 | tseed->SetReconstructor(fkReconstructor); |
eb2b4f91 |
2623 | tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]); |
d611c74f |
2624 | tseed->Init(GetRiemanFitter()); |
f29f13a6 |
2625 | tseed->SetStandAlone(kTRUE); |
d611c74f |
2626 | } |
2627 | |
2628 | Bool_t isFake = kFALSE; |
a2fbb6ec |
2629 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
d611c74f |
2630 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2631 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2632 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2633 | |
2634 | Double_t xpos[4]; |
2635 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); |
2636 | Float_t yref[4]; |
2637 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); |
2638 | Int_t ll = c[3]->GetLabel(0); |
2639 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2640 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2641 | AliRieman *rim = GetRiemanFitter(); |
a2fbb6ec |
2642 | TTreeSRedirector &cs0 = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f |
2643 | cs0 << "MakeSeeds0" |
2644 | <<"EventNumber=" << eventNumber |
2645 | <<"CandidateNumber=" << candidateNumber |
2646 | <<"isFake=" << isFake |
2647 | <<"config=" << config |
2648 | <<"label=" << ll |
2649 | <<"chi2z=" << chi2[0] |
2650 | <<"chi2y=" << chi2[1] |
2651 | <<"Y2exp=" << cond2[0] |
2652 | <<"Z2exp=" << cond2[1] |
2653 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() |
2654 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() |
2655 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() |
2656 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() |
2657 | <<"yref0=" << yref[0] |
2658 | <<"yref1=" << yref[1] |
2659 | <<"yref2=" << yref[2] |
2660 | <<"yref3=" << yref[3] |
2661 | <<"c0.=" << c[0] |
2662 | <<"c1.=" << c[1] |
2663 | <<"c2.=" << c[2] |
2664 | <<"c3.=" << c[3] |
2665 | <<"Seed0.=" << &cseed[planes[0]] |
2666 | <<"Seed1.=" << &cseed[planes[1]] |
2667 | <<"Seed2.=" << &cseed[planes[2]] |
2668 | <<"Seed3.=" << &cseed[planes[3]] |
2669 | <<"RiemanFitter.=" << rim |
2670 | <<"\n"; |
2671 | } |
4d6aee34 |
2672 | if(chi2[0] > fkReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
6e39bde4 |
2673 | //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0])); |
d611c74f |
2674 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2675 | continue; |
2676 | } |
4d6aee34 |
2677 | if(chi2[1] > fkReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
6e39bde4 |
2678 | //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1])); |
d611c74f |
2679 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2680 | continue; |
2681 | } |
2682 | //AliInfo("Passed chi2 filter."); |
2683 | |
2684 | // try attaching clusters to tracklets |
6e39bde4 |
2685 | Int_t mlayers = 0; |
cfa15645 |
2686 | AliTRDcluster *cl = NULL; |
be24510a |
2687 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f |
2688 | Int_t jLayer = planes[iLayer]; |
cfa15645 |
2689 | Int_t nNotInChamber = 0; |
f29f13a6 |
2690 | if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue; |
5f1ae1e7 |
2691 | if(/*fkReconstructor->IsHLT()*/kFALSE){ |
692decf4 |
2692 | cseed[jLayer].UpdateUsed(); |
cfa15645 |
2693 | if(!cseed[jLayer].IsOK()) continue; |
2694 | }else{ |
2695 | cseed[jLayer].Fit(); |
2696 | cseed[jLayer].UpdateUsed(); |
2697 | cseed[jLayer].ResetClusterIter(); |
2698 | while((cl = cseed[jLayer].NextCluster())){ |
2699 | if(!cl->IsInChamber()) nNotInChamber++; |
2700 | } |
2701 | //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber); |
2702 | 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 |
2703 | } |
d611c74f |
2704 | mlayers++; |
2705 | } |
be24510a |
2706 | |
2707 | if(mlayers < kNSeedPlanes){ |
2708 | //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes)); |
2709 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2710 | continue; |
2711 | } |
2712 | |
2713 | // temporary exit door for the HLT |
4d6aee34 |
2714 | if(fkReconstructor->IsHLT()){ |
be24510a |
2715 | // attach clusters to extrapolation chambers |
2716 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2717 | Int_t jLayer = planesExt[iLayer]; |
2718 | if(!(chamber = stack[jLayer])) continue; |
f29f13a6 |
2719 | cseed[jLayer].AttachClusters(chamber, kTRUE); |
5f1ae1e7 |
2720 | cseed[jLayer].Fit(); |
be24510a |
2721 | } |
4302c900 |
2722 | fTrackQuality[ntracks] = 1.; // dummy value |
2723 | ntracks++; |
218ba867 |
2724 | if(ntracks == kMaxTracksStack) return ntracks; |
4302c900 |
2725 | cseed += 6; |
2726 | continue; |
2727 | } |
2728 | |
be24510a |
2729 | |
f29f13a6 |
2730 | // Update Seeds and calculate Likelihood |
d611c74f |
2731 | // fit tracklets and cook likelihood |
f29f13a6 |
2732 | FitTiltedRieman(&cseed[0], kTRUE); |
2733 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
2734 | Int_t jLayer = planes[iLayer]; |
2735 | cseed[jLayer].Fit(kTRUE); |
2736 | } |
91834b8d |
2737 | Double_t like = CookLikelihood(&cseed[0], planes); // to be checked |
d611c74f |
2738 | |
4d6aee34 |
2739 | if (TMath::Log(1.E-9 + like) < fkReconstructor->GetRecoParam() ->GetTrackLikelihood()){ |
d611c74f |
2740 | //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2741 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2742 | continue; |
2743 | } |
2744 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2745 | |
2746 | // book preliminary results |
2747 | seedQuality[ntracks] = like; |
2748 | fSeedLayer[ntracks] = config;/*sLayer;*/ |
2749 | |
2750 | // attach clusters to the extrapolation seeds |
be24510a |
2751 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2752 | Int_t jLayer = planesExt[iLayer]; |
d611c74f |
2753 | if(!(chamber = stack[jLayer])) continue; |
d611c74f |
2754 | |
2755 | // fit extrapolated seed |
2756 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; |
2757 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; |
2758 | AliTRDseedV1 pseed = cseed[jLayer]; |
f29f13a6 |
2759 | if(!pseed.AttachClusters(chamber, kTRUE)) continue; |
2760 | pseed.Fit(kTRUE); |
d611c74f |
2761 | cseed[jLayer] = pseed; |
d611c74f |
2762 | FitTiltedRieman(cseed, kTRUE); |
f29f13a6 |
2763 | cseed[jLayer].Fit(kTRUE); |
d611c74f |
2764 | } |
2765 | |
2766 | // AliInfo("Extrapolation done."); |
2767 | // Debug Stream containing all the 6 tracklets |
a2fbb6ec |
2768 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
2769 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f |
2770 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2771 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2772 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2773 | cstreamer << "MakeSeeds1" |
2774 | << "EventNumber=" << eventNumber |
2775 | << "CandidateNumber=" << candidateNumber |
2776 | << "S0.=" << &cseed[0] |
2777 | << "S1.=" << &cseed[1] |
2778 | << "S2.=" << &cseed[2] |
2779 | << "S3.=" << &cseed[3] |
2780 | << "S4.=" << &cseed[4] |
2781 | << "S5.=" << &cseed[5] |
2782 | << "FitterT.=" << tiltedRieman |
2783 | << "\n"; |
2784 | } |
2785 | |
a2fbb6ec |
2786 | if(fkReconstructor->GetRecoParam()->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){ |
d611c74f |
2787 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2788 | continue; |
2789 | } |
2790 | //AliInfo("Improve seed quality done."); |
2791 | |
2792 | // fit full track and cook likelihoods |
2793 | // Double_t curv = FitRieman(&cseed[0], chi2); |
2794 | // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.); |
2795 | // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.); |
2796 | |
2797 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) |
2798 | Double_t chi2Vals[3]; |
6e39bde4 |
2799 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE); |
a2fbb6ec |
2800 | if(fkReconstructor->GetRecoParam()->IsVertexConstrained()) |
d611c74f |
2801 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired |
2802 | else |
2803 | chi2Vals[1] = 1.; |
2804 | chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.); |
2805 | // Chi2 definitions in testing stage |
2806 | //chi2Vals[2] = GetChi2ZTest(&cseed[0]); |
2807 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); |
2808 | //AliInfo("Hyperplane fit done\n"); |
fac58f00 |
2809 | |
a2fbb6ec |
2810 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
2811 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
d611c74f |
2812 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2813 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2814 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); |
2815 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); |
91834b8d |
2816 | Int_t ncls = 0; |
2817 | for(Int_t iseed = 0; iseed < kNPlanes; iseed++){ |
2818 | ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0; |
2819 | } |
d611c74f |
2820 | cstreamer << "MakeSeeds2" |
2821 | << "EventNumber=" << eventNumber |
2822 | << "CandidateNumber=" << candidateNumber |
2823 | << "Chi2TR=" << chi2Vals[0] |
2824 | << "Chi2TC=" << chi2Vals[1] |
2825 | << "Nlayers=" << mlayers |
91834b8d |
2826 | << "NClusters=" << ncls |
d611c74f |
2827 | << "Like=" << like |
2828 | << "S0.=" << &cseed[0] |
2829 | << "S1.=" << &cseed[1] |
2830 | << "S2.=" << &cseed[2] |
2831 | << "S3.=" << &cseed[3] |
2832 | << "S4.=" << &cseed[4] |
2833 | << "S5.=" << &cseed[5] |
d611c74f |
2834 | << "FitterT.=" << fitterT |
2835 | << "FitterTC.=" << fitterTC |
2836 | << "\n"; |
2837 | } |
2838 | |
2839 | ntracks++; |
2840 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2841 | if(ntracks == kMaxTracksStack){ |
2842 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); |
2843 | return ntracks; |
2844 | } |
2845 | cseed += 6; |
41702fec |
2846 | } |
2847 | } |
2848 | } |
41702fec |
2849 | |
2850 | return ntracks; |
e4f2f73d |
2851 | } |
2852 | |
2853 | //_____________________________________________________________________________ |
e17f4785 |
2854 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 * const seeds, Double_t *params) |
e4f2f73d |
2855 | { |
afa21247 |
2856 | // |
2857 | // Build a TRD track out of tracklet candidates |
2858 | // |
2859 | // Parameters : |
2860 | // seeds : array of tracklets |
2861 | // params : array of track parameters as they are estimated by stand alone tracker. 7 elements. |
2862 | // [0] - radial position of the track at reference point |
2863 | // [1] - y position of the fit at [0] |
2864 | // [2] - z position of the fit at [0] |
2865 | // [3] - snp of the first tracklet |
2866 | // [4] - tgl of the first tracklet |
2867 | // [5] - curvature of the Riemann fit - 1/pt |
2868 | // [6] - sector rotation angle |
2869 | // |
2870 | // Output : |
2871 | // The TRD track. |
2872 | // |
2873 | // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix |
2874 | // (diagonal with constant variance terms TODO - correct parameterization) |
2875 | // |
2876 | // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the |
2877 | // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation() |
2878 | // for details). Do also MC label calculation and PID if propagation successfully. |
41702fec |
2879 | |
afa21247 |
2880 | |
41702fec |
2881 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
2882 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; |
2883 | Double_t c[15]; |
2884 | |
afa21247 |
2885 | c[ 0] = 0.2; // s^2_y |
2886 | c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z |
2887 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp |
2888 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl |
2889 | c[10] = 0.0; c[11] = 0.0; c[12] = 0.0; c[13] = 0.0; c[14] = params[5]*params[5]*0.01; // s^2_1/pt |
41702fec |
2890 | |
d20df6fc |
2891 | AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
2892 | track.PropagateTo(params[0]-5.0); |
4d6aee34 |
2893 | AliTRDseedV1 *ptrTracklet = NULL; |
9887cc9f |
2894 | |
2895 | // skip Kalman filter for HLT |
5f1ae1e7 |
2896 | if(/*fkReconstructor->IsHLT()*/kFALSE){ |
9887cc9f |
2897 | for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) { |
2898 | track.UnsetTracklet(jLayer); |
e17f4785 |
2899 | ptrTracklet = &seeds[jLayer]; |
9887cc9f |
2900 | if(!ptrTracklet->IsOK()) continue; |
5f1ae1e7 |
2901 | if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian |
9887cc9f |
2902 | ptrTracklet = SetTracklet(ptrTracklet); |
f29f13a6 |
2903 | ptrTracklet->UseClusters(); |
91834b8d |
2904 | track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
2905 | } |
d78d7df0 |
2906 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
799e38d7 |
2907 | ptrTrack->CookPID(); |
5f1ae1e7 |
2908 | ptrTrack->CookLabel(.9); |
4d6aee34 |
2909 | ptrTrack->SetReconstructor(fkReconstructor); |
d78d7df0 |
2910 | return ptrTrack; |
91834b8d |
2911 | } |
393fda1c |
2912 | |
d20df6fc |
2913 | track.ResetCovariance(1); |
e79f8eb0 |
2914 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
a2fbb6ec |
2915 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) > 5 && fkReconstructor->IsDebugStreaming()){ |
393fda1c |
2916 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2917 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2918 | Double_t p[5]; // Track Params for the Debug Stream |
2919 | track.GetExternalParameters(params[0], p); |
a2fbb6ec |
2920 | TTreeSRedirector &cs = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
393fda1c |
2921 | cs << "MakeTrack" |
2922 | << "EventNumber=" << eventNumber |
2923 | << "CandidateNumber=" << candidateNumber |
2924 | << "nc=" << nc |
2925 | << "X=" << params[0] |
2926 | << "Y=" << p[0] |
2927 | << "Z=" << p[1] |
2928 | << "snp=" << p[2] |
2929 | << "tnd=" << p[3] |
2930 | << "crv=" << p[4] |
2931 | << "Yin=" << params[1] |
2932 | << "Zin=" << params[2] |
2933 | << "snpin=" << params[3] |
2934 | << "tndin=" << params[4] |
2935 | << "crvin=" << params[5] |
2936 | << "track.=" << &track |
2937 | << "\n"; |
2938 | } |
4d6aee34 |
2939 | if (nc < 30) return NULL; |
d20df6fc |
2940 | |
2941 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
4d6aee34 |
2942 | ptrTrack->SetReconstructor(fkReconstructor); |
48f8adf3 |
2943 | ptrTrack->CookLabel(.9); |
24253b0a |
2944 | |
d20df6fc |
2945 | // computes PID for track |
2946 | ptrTrack->CookPID(); |
2947 | // update calibration references using this track |
48f8adf3 |
2948 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
2949 | if (!calibra){ |
2950 | AliInfo("Could not get Calibra instance\n"); |
2951 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack); |
2952 | } |
d20df6fc |
2953 | return ptrTrack; |
e4f2f73d |
2954 | } |
2955 | |
0906e73e |
2956 | |
e4f2f73d |
2957 | //____________________________________________________________________ |
eb38ed55 |
2958 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d |
2959 | { |
41702fec |
2960 | // |
2961 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst |
2962 | // |
2963 | // Parameters : |
2964 | // layers : Array of propagation layers for a stack/supermodule |
2965 | // cseed : Array of 6 seeding tracklets which has to be improved |
2966 | // |
f29f13a6 |
2967 | // Output : |
41702fec |
2968 | // cssed : Improved seeds |
2969 | // |
2970 | // Detailed description |
2971 | // |
2972 | // Iterative procedure in which new clusters are searched for each |
2973 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) |
2974 | // can be maximized. If some optimization is found the old seeds are replaced. |
2975 | // |
2976 | // debug level: 7 |
2977 | // |
2978 | |
2979 | // make a local working copy |
4d6aee34 |
2980 | AliTRDtrackingChamber *chamber = NULL; |
41702fec |
2981 | AliTRDseedV1 bseed[6]; |
2982 | Int_t nLayers = 0; |
2983 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer]; |
2984 | |
2985 | Float_t lastquality = 10000.0; |
2986 | Float_t lastchi2 = 10000.0; |
2987 | Float_t chi2 = 1000.0; |
2988 | |
2989 | for (Int_t iter = 0; iter < 4; iter++) { |
2990 | Float_t sumquality = 0.0; |
2991 | Float_t squality[6]; |
2992 | Int_t sortindexes[6]; |
2993 | |
2994 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { |
3a039a31 |
2995 | squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.; |
41702fec |
2996 | sumquality += squality[jLayer]; |
2997 | } |
2998 | if ((sumquality >= lastquality) || (chi2 > lastchi2)) break; |
2999 | |
3000 | nLayers = 0; |
3001 | lastquality = sumquality; |
3002 | lastchi2 = chi2; |
3003 | if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer]; |
3004 | |
3005 | TMath::Sort(6, squality, sortindexes, kFALSE); |
3006 | for (Int_t jLayer = 5; jLayer > 1; jLayer--) { |
3007 | Int_t bLayer = sortindexes[jLayer]; |
3008 | if(!(chamber = stack[bLayer])) continue; |
f29f13a6 |
3009 | bseed[bLayer].AttachClusters(chamber, kTRUE); |
3010 | bseed[bLayer].Fit(kTRUE); |
41702fec |
3011 | if(bseed[bLayer].IsOK()) nLayers++; |
3012 | } |
3013 | |
3014 | chi2 = FitTiltedRieman(bseed, kTRUE); |
a2fbb6ec |
3015 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 7 && fkReconstructor->IsDebugStreaming()){ |
41702fec |
3016 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3017 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
3018 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
a2fbb6ec |
3019 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec |
3020 | cstreamer << "ImproveSeedQuality" |
3021 | << "EventNumber=" << eventNumber |
3022 | << "CandidateNumber=" << candidateNumber |
3023 | << "Iteration=" << iter |
3024 | << "S0.=" << &bseed[0] |
3025 | << "S1.=" << &bseed[1] |
3026 | << "S2.=" << &bseed[2] |
3027 | << "S3.=" << &bseed[3] |
3028 | << "S4.=" << &bseed[4] |
3029 | << "S5.=" << &bseed[5] |
3030 | << "FitterT.=" << tiltedRieman |
3031 | << "\n"; |
3032 | } |
3033 | } // Loop: iter |
41702fec |
3034 | // we are sure that at least 2 tracklets are OK ! |
3035 | return nLayers+2; |
e4f2f73d |
3036 | } |
3037 | |
eb38ed55 |
3038 | //_________________________________________________________________________ |
4d6aee34 |
3039 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(const AliTRDseedV1 *const tracklets, Double_t *chi2){ |
41702fec |
3040 | // |
3041 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for |
3042 | // the track selection |
3043 | // The likelihood value containes: |
3044 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit |
3045 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets |
3046 | // For all Parameters an exponential dependency is used |
3047 | // |
3048 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate |
3049 | // - Array of chi2 values: |
3050 | // * Non-Constrained Tilted Riemann fit |
3051 | // * Vertex-Constrained Tilted Riemann fit |
3052 | // * z-Direction from Linear fit |
3053 | // Output: - The calculated track likelihood |
3054 | // |
3055 | // debug level 2 |
3056 | // |
3057 | |
f29f13a6 |
3058 | Double_t chi2phi = 0, nLayers = 0; |
41702fec |
3059 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
3060 | if(!tracklets[iLayer].IsOK()) continue; |
f29f13a6 |
3061 | chi2phi += tracklets[iLayer].GetChi2Phi(); |
41702fec |
3062 | nLayers++; |
3063 | } |
f29f13a6 |
3064 | chi2phi /= Float_t (nLayers - 2.0); |
41702fec |
3065 | |
3066 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z |
a2fbb6ec |
3067 | Double_t likeChi2TC = (fkReconstructor->GetRecoParam()->IsVertexConstrained()) ? |
d20df6fc |
3068 | TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann |
6e39bde4 |
3069 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann |
3070 | Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23 |
f29f13a6 |
3071 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi; |
41702fec |
3072 | |
a2fbb6ec |
3073 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
41702fec |
3074 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3075 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
a2fbb6ec |
3076 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec |
3077 | cstreamer << "CalculateTrackLikelihood0" |
3078 | << "EventNumber=" << eventNumber |
3079 | << "CandidateNumber=" << candidateNumber |
3080 | << "LikeChi2Z=" << likeChi2Z |
3081 | << "LikeChi2TR=" << likeChi2TR |
3082 | << "LikeChi2TC=" << likeChi2TC |
f29f13a6 |
3083 | << "LikeChi2Phi=" << likeChi2Phi |
41702fec |
3084 | << "TrackLikelihood=" << trackLikelihood |
3085 | << "\n"; |
3086 | } |
6e39bde4 |
3087 | |
41702fec |
3088 | return trackLikelihood; |
e4f2f73d |
3089 | } |
3090 | |
3091 | //____________________________________________________________________ |
91834b8d |
3092 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]) |
e4f2f73d |
3093 | { |
41702fec |
3094 | // |
3095 | // Calculate the probability of this track candidate. |
3096 | // |
3097 | // Parameters : |
3098 | // cseeds : array of candidate tracklets |
3099 | // planes : array of seeding planes (see seeding configuration) |
3100 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. |
3101 | // |
3102 | // Output : |
3103 | // likelihood value |
3104 | // |
3105 | // Detailed description |
3106 | // |
3107 | // The track quality is estimated based on the following 4 criteria: |
3108 | // 1. precision of the rieman fit on the Y direction (likea) |
3109 | // 2. chi2 on the Y direction (likechi2y) |
3110 | // 3. chi2 on the Z direction (likechi2z) |
3111 | // 4. number of attached clusters compared to a reference value |
3112 | // (see AliTRDrecoParam::fkFindable) (likeN) |
3113 | // |
3114 | // The distributions for each type of probabilities are given below as of |
3115 | // (date). They have to be checked to assure consistency of estimation. |
3116 | // |
3117 | |
3118 | // ratio of the total number of clusters/track which are expected to be found by the tracker. |
4d6aee34 |
3119 | const AliTRDrecoParam *fRecoPars = fkReconstructor->GetRecoParam(); |
41702fec |
3120 | |
91834b8d |
3121 | Double_t chi2y = GetChi2Y(&cseed[0]); |
3122 | Double_t chi2z = GetChi2Z(&cseed[0]); |
3123 | |
8ae98148 |
3124 | Float_t nclusters = 0.; |
41702fec |
3125 | Double_t sumda = 0.; |
3126 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ |
3127 | Int_t jlayer = planes[ilayer]; |
3128 | nclusters += cseed[jlayer].GetN2(); |
e3cf3d02 |
3129 | sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1)); |
41702fec |
3130 | } |
8ae98148 |
3131 | nclusters *= .25; |
3132 | |
5a2e200c |
3133 | Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope()); |
41702fec |
3134 | Double_t likechi2y = 0.0000000001; |
4d6aee34 |
3135 | if (fkReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope()); |
5a2e200c |
3136 | Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope()); |
8ae98148 |
3137 | Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters()); |
41702fec |
3138 | Double_t like = likea * likechi2y * likechi2z * likeN; |
3139 | |
a2fbb6ec |
3140 | if(fkReconstructor->GetRecoParam()->GetStreamLevel(AliTRDrecoParam::kTracker) >= 2 && fkReconstructor->IsDebugStreaming()){ |
41702fec |
3141 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3142 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
4d6aee34 |
3143 | Int_t nTracklets = 0; Float_t meanNcls = 0; |
91834b8d |
3144 | for(Int_t iseed=0; iseed < kNPlanes; iseed++){ |
3145 | if(!cseed[iseed].IsOK()) continue; |
3146 | nTracklets++; |
4d6aee34 |
3147 | meanNcls += cseed[iseed].GetN2(); |
91834b8d |
3148 | } |
4d6aee34 |
3149 | if(nTracklets) meanNcls /= nTracklets; |
41702fec |
3150 | // The Debug Stream contains the seed |
a2fbb6ec |
3151 | TTreeSRedirector &cstreamer = *fkReconstructor->GetDebugStream(AliTRDrecoParam::kTracker); |
41702fec |
3152 | cstreamer << "CookLikelihood" |
3153 | << "EventNumber=" << eventNumber |
3154 | << "CandidateNumber=" << candidateNumber |
3155 | << "tracklet0.=" << &cseed[0] |
3156 | << "tracklet1.=" << &cseed[1] |
3157 | << "tracklet2.=" << &cseed[2] |
3158 | << "tracklet3.=" << &cseed[3] |
3159 | << "tracklet4.=" << &cseed[4] |
3160 | << "tracklet5.=" << &cseed[5] |
3161 | << "sumda=" << sumda |
91834b8d |
3162 | << "chi2y=" << chi2y |
3163 | << "chi2z=" << chi2z |
41702fec |
3164 | << "likea=" << likea |
3165 | << "likechi2y=" << likechi2y |
3166 | << "likechi2z=" << likechi2z |
3167 | << "nclusters=" << nclusters |
3168 | << "likeN=" << likeN |
3169 | << "like=" << like |
4d6aee34 |
3170 | << "meanncls=" << meanNcls |
41702fec |
3171 | << "\n"; |
3172 | } |
3173 | |
3174 | return like; |
e4f2f73d |
3175 | } |
3176 | |
e4f2f73d |
3177 | //____________________________________________________________________ |
0906e73e |
3178 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d |
3179 | { |
41702fec |
3180 | // |
3181 | // Map seeding configurations to detector planes. |
3182 | // |
3183 | // Parameters : |
3184 | // iconfig : configuration index |
3185 | // planes : member planes of this configuration. On input empty. |
3186 | // |
3187 | // Output : |
3188 | // planes : contains the planes which are defining the configuration |
3189 | // |
3190 | // Detailed description |
3191 | // |
3192 | // Here is the list of seeding planes configurations together with |
3193 | // their topological classification: |
3194 | // |
3195 | // 0 - 5432 TQ 0 |
3196 | // 1 - 4321 TQ 0 |
3197 | // 2 - 3210 TQ 0 |
3198 | // 3 - 5321 TQ 1 |
3199 | // 4 - 4210 TQ 1 |
3200 | // 5 - 5431 TQ 1 |
3201 | // 6 - 4320 TQ 1 |
3202 | // 7 - 5430 TQ 2 |
3203 | // 8 - 5210 TQ 2 |
3204 | // 9 - 5421 TQ 3 |
3205 | // 10 - 4310 TQ 3 |
3206 | // 11 - 5410 TQ 4 |
3207 | // 12 - 5420 TQ 5 |
3208 | // 13 - 5320 TQ 5 |
3209 | // 14 - 5310 TQ 5 |
3210 | // |
3211 | // The topologic quality is modeled as follows: |
3212 | // 1. The general model is define by the equation: |
3213 | // p(conf) = exp(-conf/2) |
3214 | // 2. According to the topologic classification, configurations from the same |
3215 | // class are assigned the agerage value over the model values. |
3216 | // 3. Quality values are normalized. |
3217 | // |
3218 | // The topologic quality distribution as function of configuration is given below: |
3219 | //Begin_Html |
3220 | // <img src="gif/topologicQA.gif"> |
3221 | //End_Html |
3222 | // |
3223 | |
3224 | switch(iconfig){ |
|