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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 <Riostream.h> |
29 | // #include <stdio.h> |
30 | // #include <string.h> |
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31 | |
32 | #include <TBranch.h> |
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33 | #include <TDirectory.h> |
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34 | #include <TLinearFitter.h> |
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35 | #include <TTree.h> |
36 | #include <TClonesArray.h> |
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37 | #include <TTreeStream.h> |
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38 | #include <TGeoMatrix.h> |
39 | #include <TGeoManager.h> |
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40 | |
41 | #include "AliLog.h" |
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42 | #include "AliMathBase.h" |
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43 | #include "AliESDEvent.h" |
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44 | #include "AliGeomManager.h" |
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45 | #include "AliRieman.h" |
46 | #include "AliTrackPointArray.h" |
47 | |
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48 | #include "AliTRDgeometry.h" |
49 | #include "AliTRDpadPlane.h" |
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50 | #include "AliTRDcalibDB.h" |
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51 | #include "AliTRDReconstructor.h" |
52 | #include "AliTRDCalibraFillHisto.h" |
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53 | #include "AliTRDrecoParam.h" |
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54 | |
55 | #include "AliTRDcluster.h" |
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56 | #include "AliTRDseedV1.h" |
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57 | #include "AliTRDtrackV1.h" |
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58 | #include "AliTRDtrackerV1.h" |
59 | #include "AliTRDtrackerDebug.h" |
60 | #include "AliTRDtrackingChamber.h" |
61 | #include "AliTRDchamberTimeBin.h" |
62 | |
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63 | |
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64 | |
65 | ClassImp(AliTRDtrackerV1) |
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66 | |
67 | |
68 | const Float_t AliTRDtrackerV1::fgkMinClustersInTrack = 0.5; // |
69 | const Float_t AliTRDtrackerV1::fgkLabelFraction = 0.8; // |
70 | const Double_t AliTRDtrackerV1::fgkMaxChi2 = 12.0; // |
71 | const Double_t AliTRDtrackerV1::fgkMaxSnp = 0.95; // Maximum local sine of the azimuthal angle |
72 | const Double_t AliTRDtrackerV1::fgkMaxStep = 2.0; // Maximal step size in propagation |
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73 | Double_t AliTRDtrackerV1::fgTopologicQA[kNConfigs] = { |
6e39bde4 |
74 | 0.5112, 0.5112, 0.5112, 0.0786, 0.0786, |
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75 | 0.0786, 0.0786, 0.0579, 0.0579, 0.0474, |
76 | 0.0474, 0.0408, 0.0335, 0.0335, 0.0335 |
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77 | }; |
78 | const Double_t AliTRDtrackerV1::fgkX0[kNPlanes] = { |
79 | 300.2, 312.8, 325.4, 338.0, 350.6, 363.2}; |
2985ffcb |
80 | Int_t AliTRDtrackerV1::fgNTimeBins = 0; |
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81 | AliRieman* AliTRDtrackerV1::fgRieman = 0x0; |
82 | TLinearFitter* AliTRDtrackerV1::fgTiltedRieman = 0x0; |
83 | TLinearFitter* AliTRDtrackerV1::fgTiltedRiemanConstrained = 0x0; |
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84 | |
85 | //____________________________________________________________________ |
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86 | AliTRDtrackerV1::AliTRDtrackerV1(AliTRDReconstructor *rec) |
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87 | :AliTracker() |
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88 | ,fReconstructor(0x0) |
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89 | ,fGeom(0x0) |
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90 | ,fClusters(0x0) |
91 | ,fTracklets(0x0) |
92 | ,fTracks(0x0) |
93 | ,fSieveSeeding(0) |
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94 | { |
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95 | // |
96 | // Default constructor. |
97 | // |
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98 | |
99 | SetReconstructor(rec); // initialize reconstructor |
100 | |
101 | // initialize geometry |
102 | if(!AliGeomManager::GetGeometry()){ |
103 | AliFatal("Could not get geometry."); |
104 | } |
105 | fGeom = new AliTRDgeometry(); |
106 | fGeom->CreateClusterMatrixArray(); |
107 | TGeoHMatrix *matrix = 0x0; |
108 | Double_t loc[] = {0., 0., 0.}; |
109 | Double_t glb[] = {0., 0., 0.}; |
110 | for(Int_t ily=kNPlanes; ily--;){ |
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111 | Int_t ism = 0; |
112 | while(!(matrix = fGeom->GetClusterMatrix(AliTRDgeometry::GetDetector(ily, 2, ism)))) ism++; |
113 | if(!matrix){ |
114 | AliError(Form("Could not get transformation matrix for layer %d. Use default.", ily)); |
115 | fR[ily] = fgkX0[ily]; |
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116 | continue; |
117 | } |
118 | matrix->LocalToMaster(loc, glb); |
119 | fR[ily] = glb[0]+ AliTRDgeometry::AnodePos()-.5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); |
120 | } |
121 | |
122 | // initialize calibration values |
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123 | AliTRDcalibDB *trd = 0x0; |
124 | if (!(trd = AliTRDcalibDB::Instance())) { |
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125 | AliFatal("Could not get calibration."); |
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126 | } |
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127 | if(!fgNTimeBins) fgNTimeBins = trd->GetNumberOfTimeBins(); |
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128 | |
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129 | // initialize cluster containers |
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130 | for (Int_t isector = 0; isector < AliTRDgeometry::kNsector; isector++) new(&fTrSec[isector]) AliTRDtrackingSector(fGeom, isector); |
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131 | |
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132 | // initialize arrays |
133 | memset(fTrackQuality, 0, kMaxTracksStack*sizeof(Double_t)); |
134 | memset(fSeedLayer, 0, kMaxTracksStack*sizeof(Int_t)); |
135 | memset(fSeedTB, 0, kNSeedPlanes*sizeof(AliTRDchamberTimeBin*)); |
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136 | } |
137 | |
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138 | //____________________________________________________________________ |
139 | AliTRDtrackerV1::~AliTRDtrackerV1() |
140 | { |
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141 | // |
142 | // Destructor |
143 | // |
144 | |
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145 | if(fgRieman) delete fgRieman; fgRieman = 0x0; |
146 | if(fgTiltedRieman) delete fgTiltedRieman; fgTiltedRieman = 0x0; |
147 | if(fgTiltedRiemanConstrained) delete fgTiltedRiemanConstrained; fgTiltedRiemanConstrained = 0x0; |
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148 | for(Int_t isl =0; isl<kNSeedPlanes; isl++) if(fSeedTB[isl]) delete fSeedTB[isl]; |
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149 | if(fTracks) {fTracks->Delete(); delete fTracks;} |
150 | if(fTracklets) {fTracklets->Delete(); delete fTracklets;} |
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151 | if(fClusters) { |
152 | fClusters->Delete(); delete fClusters; |
153 | } |
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154 | if(fGeom) delete fGeom; |
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155 | } |
156 | |
157 | //____________________________________________________________________ |
158 | Int_t AliTRDtrackerV1::Clusters2Tracks(AliESDEvent *esd) |
159 | { |
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160 | // |
161 | // Steering stand alone tracking for full TRD detector |
162 | // |
163 | // Parameters : |
164 | // esd : The ESD event. On output it contains |
165 | // the ESD tracks found in TRD. |
166 | // |
167 | // Output : |
168 | // Number of tracks found in the TRD detector. |
169 | // |
170 | // Detailed description |
171 | // 1. Launch individual SM trackers. |
172 | // See AliTRDtrackerV1::Clusters2TracksSM() for details. |
173 | // |
174 | |
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175 | if(!fReconstructor->GetRecoParam() ){ |
176 | AliError("Reconstruction configuration not initialized. Call first AliTRDReconstructor::SetRecoParam()."); |
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177 | return 0; |
178 | } |
179 | |
180 | //AliInfo("Start Track Finder ..."); |
181 | Int_t ntracks = 0; |
053767a4 |
182 | for(int ism=0; ism<AliTRDgeometry::kNsector; ism++){ |
41702fec |
183 | // for(int ism=1; ism<2; ism++){ |
184 | //AliInfo(Form("Processing supermodule %i ...", ism)); |
185 | ntracks += Clusters2TracksSM(ism, esd); |
186 | } |
187 | AliInfo(Form("Number of found tracks : %d", ntracks)); |
188 | return ntracks; |
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189 | } |
190 | |
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191 | |
192 | //_____________________________________________________________________________ |
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193 | Bool_t AliTRDtrackerV1::GetTrackPoint(Int_t index, AliTrackPoint &p) const |
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194 | { |
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195 | //AliInfo(Form("Asking for tracklet %d", index)); |
196 | |
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197 | // reset position of the point before using it |
198 | p.SetXYZ(0., 0., 0.); |
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199 | AliTRDseedV1 *tracklet = GetTracklet(index); |
200 | if (!tracklet) return kFALSE; |
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201 | |
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202 | // get detector for this tracklet |
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203 | Int_t det = tracklet->GetDetector(); |
204 | Int_t sec = fGeom->GetSector(det); |
205 | Double_t alpha = (sec+.5)*AliTRDgeometry::GetAlpha(), |
206 | sinA = TMath::Sin(alpha), |
207 | cosA = TMath::Cos(alpha); |
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208 | Double_t local[3]; |
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209 | local[0] = tracklet->GetX(); |
210 | local[1] = tracklet->GetY(); |
211 | local[2] = tracklet->GetZ(); |
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212 | Double_t global[3]; |
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213 | fGeom->RotateBack(det, local, global); |
214 | |
215 | Double_t cov2D[3]; Float_t cov[6]; |
216 | tracklet->GetCovAt(local[0], cov2D); |
217 | cov[0] = cov2D[0]*sinA*sinA; |
218 | cov[1] =-cov2D[0]*sinA*cosA; |
219 | cov[2] =-cov2D[1]*sinA; |
220 | cov[3] = cov2D[0]*cosA*cosA; |
221 | cov[4] = cov2D[1]*cosA; |
222 | cov[5] = cov2D[2]; |
223 | // store the global position of the tracklet and its covariance matrix in the track point |
224 | p.SetXYZ(global[0],global[1],global[2], cov); |
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225 | |
226 | // setting volume id |
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227 | AliGeomManager::ELayerID iLayer = AliGeomManager::ELayerID(AliGeomManager::kTRD1+fGeom->GetLayer(det)); |
228 | Int_t modId = fGeom->GetSector(det) * AliTRDgeometry::kNstack + fGeom->GetStack(det); |
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229 | UShort_t volid = AliGeomManager::LayerToVolUID(iLayer, modId); |
230 | p.SetVolumeID(volid); |
231 | |
232 | return kTRUE; |
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233 | } |
234 | |
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235 | //____________________________________________________________________ |
236 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitter() |
237 | { |
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238 | if(!fgTiltedRieman) fgTiltedRieman = new TLinearFitter(4, "hyp4"); |
239 | return fgTiltedRieman; |
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240 | } |
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241 | |
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242 | //____________________________________________________________________ |
243 | TLinearFitter* AliTRDtrackerV1::GetTiltedRiemanFitterConstraint() |
244 | { |
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245 | if(!fgTiltedRiemanConstrained) fgTiltedRiemanConstrained = new TLinearFitter(2, "hyp2"); |
246 | return fgTiltedRiemanConstrained; |
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247 | } |
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248 | |
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249 | //____________________________________________________________________ |
250 | AliRieman* AliTRDtrackerV1::GetRiemanFitter() |
251 | { |
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252 | if(!fgRieman) fgRieman = new AliRieman(AliTRDseedV1::kNtb * AliTRDgeometry::kNlayer); |
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253 | return fgRieman; |
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254 | } |
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255 | |
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256 | //_____________________________________________________________________________ |
257 | Int_t AliTRDtrackerV1::PropagateBack(AliESDEvent *event) |
258 | { |
2a3191bb |
259 | // Propagation of ESD tracks from TPC to TOF detectors and building of the TRD track. For building |
260 | // a TRD track an ESD track is used as seed. The informations obtained on the TRD track (measured points, |
261 | // covariance, PID, etc.) are than used to update the corresponding ESD track. |
262 | // Each track seed is first propagated to the geometrical limit of the TRD detector. |
263 | // Its prolongation is searched in the TRD and if corresponding clusters are found tracklets are |
264 | // constructed out of them (see AliTRDseedV1::AttachClusters()) and the track is updated. |
265 | // Otherwise the ESD track is left unchanged. |
266 | // |
267 | // The following steps are performed: |
268 | // 1. Selection of tracks based on the variance in the y-z plane. |
269 | // 2. Propagation to the geometrical limit of the TRD volume. If track propagation fails the AliESDtrack::kTRDStop is set. |
270 | // 3. Prolongation inside the fiducial volume (see AliTRDtrackerV1::FollowBackProlongation()) and marking |
271 | // the following status bits: |
272 | // - AliESDtrack::kTRDin - if the tracks enters the TRD fiducial volume |
273 | // - AliESDtrack::kTRDStop - if the tracks fails propagation |
274 | // - AliESDtrack::kTRDbackup - if the tracks fulfills chi2 conditions and qualify for refitting |
275 | // 4. Writting to friends, PID, MC label, quality etc. Setting status bit AliESDtrack::kTRDout. |
276 | // 5. Propagation to TOF. If track propagation fails the AliESDtrack::kTRDStop is set. |
277 | // |
278 | |
279 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); // Calibration monitor |
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280 | if (!calibra) AliInfo("Could not get Calibra instance\n"); |
281 | |
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282 | // Define scalers |
283 | Int_t nFound = 0, // number of tracks found |
284 | nSeeds = 0, // total number of ESD seeds |
285 | nTRDseeds= 0, // number of seeds in the TRD acceptance |
286 | nTPCseeds= 0; // number of TPC seeds |
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287 | Float_t foundMin = 20.0; |
288 | |
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289 | Float_t *quality = 0x0; |
290 | Int_t *index = 0x0; |
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291 | nSeeds = event->GetNumberOfTracks(); |
292 | // Sort tracks according to quality |
293 | // (covariance in the yz plane) |
294 | if(nSeeds){ |
295 | quality = new Float_t[nSeeds]; |
296 | index = new Int_t[nSeeds]; |
297 | for (Int_t iSeed = nSeeds; iSeed--;) { |
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298 | AliESDtrack *seed = event->GetTrack(iSeed); |
299 | Double_t covariance[15]; |
300 | seed->GetExternalCovariance(covariance); |
301 | quality[iSeed] = covariance[0] + covariance[2]; |
302 | } |
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303 | TMath::Sort(nSeeds, quality, index,kFALSE); |
41702fec |
304 | } |
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305 | |
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306 | // Propagate all seeds |
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307 | Int_t expectedClr; |
308 | AliTRDtrackV1 track; |
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309 | for (Int_t iSeed = 0; iSeed < nSeeds; iSeed++) { |
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310 | |
311 | // Get the seeds in sorted sequence |
312 | AliESDtrack *seed = event->GetTrack(index[iSeed]); |
eb2b4f91 |
313 | Float_t p4 = seed->GetC(seed->GetBz()); |
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314 | |
315 | // Check the seed status |
316 | ULong_t status = seed->GetStatus(); |
317 | if ((status & AliESDtrack::kTPCout) == 0) continue; |
318 | if ((status & AliESDtrack::kTRDout) != 0) continue; |
eb2b4f91 |
319 | |
320 | // Propagate to the entrance in the TRD mother volume |
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321 | new(&track) AliTRDtrackV1(*seed); |
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322 | if(AliTRDgeometry::GetXtrdBeg() > (fgkMaxStep + track.GetX()) && !PropagateToX(track, AliTRDgeometry::GetXtrdBeg(), fgkMaxStep)){ |
323 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
324 | continue; |
325 | } |
326 | if(!AdjustSector(&track)){ |
327 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
328 | continue; |
329 | } |
330 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp) { |
331 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
332 | continue; |
333 | } |
334 | |
335 | nTPCseeds++; |
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336 | |
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337 | // store track status at TRD entrance |
76b60503 |
338 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
ae3fbe1f |
339 | |
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340 | // prepare track and do propagation in the TRD |
341 | track.SetReconstructor(fReconstructor); |
342 | track.SetKink(Bool_t(seed->GetKinkIndex(0))); |
343 | expectedClr = FollowBackProlongation(track); |
344 | // check if track entered the TRD fiducial volume |
345 | if(track.GetTrackLow()){ |
346 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDin); |
347 | nTRDseeds++; |
348 | } |
349 | // check if track was stopped in the TRD |
350 | if (expectedClr<0){ |
351 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
352 | continue; |
353 | } |
ae3fbe1f |
354 | |
355 | if(expectedClr){ |
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356 | nFound++; |
41702fec |
357 | // computes PID for track |
358 | track.CookPID(); |
359 | // update calibration references using this track |
360 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(&track); |
361 | // save calibration object |
eb2b4f91 |
362 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
224f357f |
363 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(track); |
364 | calibTrack->SetOwner(); |
365 | seed->AddCalibObject(calibTrack); |
366 | } |
367 | //update ESD track |
41702fec |
368 | if ((track.GetNumberOfClusters() > 15) && (track.GetNumberOfClusters() > 0.5*expectedClr)) { |
2389e96f |
369 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
41702fec |
370 | track.UpdateESDtrack(seed); |
41702fec |
371 | } |
372 | } |
373 | |
27fbeba8 |
374 | if ((TMath::Abs(track.GetC(track.GetBz()) - p4) / TMath::Abs(p4) < 0.2) ||(track.Pt() > 0.8)) { |
e3cf3d02 |
375 | |
41702fec |
376 | // Make backup for back propagation |
41702fec |
377 | Int_t foundClr = track.GetNumberOfClusters(); |
378 | if (foundClr >= foundMin) { |
41702fec |
379 | track.CookLabel(1. - fgkLabelFraction); |
f29f13a6 |
380 | //if(track.GetBackupTrack()) UseClusters(track.GetBackupTrack()); |
41702fec |
381 | |
382 | // Sign only gold tracks |
383 | if (track.GetChi2() / track.GetNumberOfClusters() < 4) { |
f29f13a6 |
384 | //if ((seed->GetKinkIndex(0) == 0) && (track.Pt() < 1.5)) UseClusters(&track); |
41702fec |
385 | } |
386 | Bool_t isGold = kFALSE; |
387 | |
388 | // Full gold track |
389 | if (track.GetChi2() / track.GetNumberOfClusters() < 5) { |
390 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
391 | |
392 | isGold = kTRUE; |
393 | } |
394 | |
395 | // Almost gold track |
396 | if ((!isGold) && (track.GetNCross() == 0) && (track.GetChi2() / track.GetNumberOfClusters() < 7)) { |
397 | //seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); |
398 | if (track.GetBackupTrack()) seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
399 | |
400 | isGold = kTRUE; |
401 | } |
402 | |
403 | if ((!isGold) && (track.GetBackupTrack())) { |
404 | if ((track.GetBackupTrack()->GetNumberOfClusters() > foundMin) && ((track.GetBackupTrack()->GetChi2()/(track.GetBackupTrack()->GetNumberOfClusters()+1)) < 7)) { |
405 | seed->UpdateTrackParams(track.GetBackupTrack(),AliESDtrack::kTRDbackup); |
406 | isGold = kTRUE; |
407 | } |
408 | } |
41702fec |
409 | } |
410 | } |
411 | |
eb2b4f91 |
412 | // Propagation to the TOF |
413 | if(!(seed->GetStatus()&AliESDtrack::kTRDStop)) { |
414 | Int_t sm = track.GetSector(); |
415 | // default value in case we have problems with the geometry. |
416 | Double_t xtof = 371.; |
417 | //Calculate radial position of the beginning of the TOF |
418 | //mother volume. In order to avoid mixing of the TRD |
419 | //and TOF modules some hard values are needed. This are: |
420 | //1. The path to the TOF module. |
421 | //2. The width of the TOF (29.05 cm) |
422 | //(with the help of Annalisa de Caro Mar-17-2009) |
423 | if(gGeoManager){ |
424 | gGeoManager->cd(Form("/ALIC_1/B077_1/BSEGMO%d_1/BTOF%d_1", sm, sm)); |
425 | TGeoHMatrix *m = 0x0; |
426 | Double_t loc[]={0., 0., -.5*29.05}, glob[3]; |
427 | |
428 | if((m=gGeoManager->GetCurrentMatrix())){ |
429 | m->LocalToMaster(loc, glob); |
430 | xtof = TMath::Sqrt(glob[0]*glob[0]+glob[1]*glob[1]); |
431 | } |
41702fec |
432 | } |
672b48bd |
433 | if(xtof > (fgkMaxStep + track.GetX()) && !PropagateToX(track, xtof, fgkMaxStep)){ |
434 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
435 | continue; |
436 | } |
437 | if(!AdjustSector(&track)){ |
438 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
439 | continue; |
440 | } |
441 | if(TMath::Abs(track.GetSnp()) > fgkMaxSnp){ |
442 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDStop); |
443 | continue; |
444 | } |
eb2b4f91 |
445 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDout); |
446 | // TODO obsolete - delete |
447 | seed->SetTRDQuality(track.StatusForTOF()); |
41702fec |
448 | } |
41702fec |
449 | seed->SetTRDBudget(track.GetBudget(0)); |
450 | } |
d611c74f |
451 | if(index) delete [] index; |
452 | if(quality) delete [] quality; |
41702fec |
453 | |
d4cf71ca |
454 | AliInfo(Form("Number of seeds: TPCout[%d] TRDin[%d]", nTPCseeds, nTRDseeds)); |
455 | AliInfo(Form("Number of tracks: TRDout[%d]", nFound)); |
456 | |
d611c74f |
457 | // run stand alone tracking |
3a039a31 |
458 | if (fReconstructor->IsSeeding()) Clusters2Tracks(event); |
41702fec |
459 | |
460 | return 0; |
0906e73e |
461 | } |
462 | |
463 | |
464 | //____________________________________________________________________ |
465 | Int_t AliTRDtrackerV1::RefitInward(AliESDEvent *event) |
466 | { |
41702fec |
467 | // |
468 | // Refits tracks within the TRD. The ESD event is expected to contain seeds |
469 | // at the outer part of the TRD. |
470 | // The tracks are propagated to the innermost time bin |
471 | // of the TRD and the ESD event is updated |
472 | // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch) |
473 | // |
474 | |
475 | Int_t nseed = 0; // contor for loaded seeds |
476 | Int_t found = 0; // contor for updated TRD tracks |
477 | |
478 | |
479 | AliTRDtrackV1 track; |
480 | for (Int_t itrack = 0; itrack < event->GetNumberOfTracks(); itrack++) { |
481 | AliESDtrack *seed = event->GetTrack(itrack); |
482 | new(&track) AliTRDtrackV1(*seed); |
483 | |
484 | if (track.GetX() < 270.0) { |
485 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDbackup); |
486 | continue; |
487 | } |
488 | |
e3cf3d02 |
489 | // reject tracks which failed propagation in the TRD or |
490 | // are produced by the TRD stand alone tracker |
41702fec |
491 | ULong_t status = seed->GetStatus(); |
e3cf3d02 |
492 | if(!(status & AliESDtrack::kTRDout)) continue; |
493 | if(!(status & AliESDtrack::kTRDin)) continue; |
41702fec |
494 | nseed++; |
495 | |
496 | track.ResetCovariance(50.0); |
497 | |
498 | // do the propagation and processing |
499 | Bool_t kUPDATE = kFALSE; |
500 | Double_t xTPC = 250.0; |
501 | if(FollowProlongation(track)){ |
502 | // Prolongate to TPC |
503 | if (PropagateToX(track, xTPC, fgkMaxStep)) { // -with update |
e3cf3d02 |
504 | seed->UpdateTrackParams(&track, AliESDtrack::kTRDrefit); |
505 | found++; |
506 | kUPDATE = kTRUE; |
507 | } |
508 | |
509 | // Update the friend track |
510 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
511 | TObject *o = 0x0; Int_t ic = 0; |
512 | AliTRDtrackV1 *calibTrack = 0x0; |
513 | while((o = seed->GetCalibObject(ic++))){ |
514 | if(!(calibTrack = dynamic_cast<AliTRDtrackV1*>(o))) continue; |
515 | calibTrack->SetTrackHigh(track.GetTrackHigh()); |
516 | } |
41702fec |
517 | } |
e3cf3d02 |
518 | } |
41702fec |
519 | |
520 | // Prolongate to TPC without update |
521 | if(!kUPDATE) { |
522 | AliTRDtrackV1 tt(*seed); |
e3cf3d02 |
523 | if (PropagateToX(tt, xTPC, fgkMaxStep)) seed->UpdateTrackParams(&tt, AliESDtrack::kTRDbackup); |
41702fec |
524 | } |
525 | } |
526 | AliInfo(Form("Number of loaded seeds: %d",nseed)); |
527 | AliInfo(Form("Number of found tracks from loaded seeds: %d",found)); |
528 | |
529 | return 0; |
0906e73e |
530 | } |
531 | |
0906e73e |
532 | //____________________________________________________________________ |
533 | Int_t AliTRDtrackerV1::FollowProlongation(AliTRDtrackV1 &t) |
534 | { |
41702fec |
535 | // Extrapolates the TRD track in the TPC direction. |
536 | // |
537 | // Parameters |
538 | // t : the TRD track which has to be extrapolated |
539 | // |
540 | // Output |
541 | // number of clusters attached to the track |
542 | // |
543 | // Detailed description |
544 | // |
545 | // Starting from current radial position of track <t> this function |
546 | // extrapolates the track through the 6 TRD layers. The following steps |
547 | // are being performed for each plane: |
548 | // 1. prepare track: |
549 | // a. get plane limits in the local x direction |
550 | // b. check crossing sectors |
551 | // c. check track inclination |
552 | // 2. search tracklet in the tracker list (see GetTracklet() for details) |
553 | // 3. evaluate material budget using the geo manager |
554 | // 4. propagate and update track using the tracklet information. |
555 | // |
556 | // Debug level 2 |
557 | // |
558 | |
e3cf3d02 |
559 | Bool_t kStoreIn = kTRUE; |
41702fec |
560 | Int_t nClustersExpected = 0; |
e3cf3d02 |
561 | for (Int_t iplane = kNPlanes; iplane--;) { |
41702fec |
562 | Int_t index = 0; |
563 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
564 | if(!tracklet) continue; |
565 | if(!tracklet->IsOK()) AliWarning("tracklet not OK"); |
566 | |
e3cf3d02 |
567 | Double_t x = tracklet->GetX();//GetX0(); |
41702fec |
568 | // reject tracklets which are not considered for inward refit |
569 | if(x > t.GetX()+fgkMaxStep) continue; |
570 | |
571 | // append tracklet to track |
572 | t.SetTracklet(tracklet, index); |
573 | |
574 | if (x < (t.GetX()-fgkMaxStep) && !PropagateToX(t, x+fgkMaxStep, fgkMaxStep)) break; |
575 | if (!AdjustSector(&t)) break; |
576 | |
577 | // Start global position |
578 | Double_t xyz0[3]; |
579 | t.GetXYZ(xyz0); |
580 | |
581 | // End global position |
582 | Double_t alpha = t.GetAlpha(), y, z; |
583 | if (!t.GetProlongation(x,y,z)) break; |
584 | Double_t xyz1[3]; |
585 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
586 | xyz1[1] = x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
587 | xyz1[2] = z; |
588 | |
51a23065 |
589 | Double_t length = TMath::Sqrt( |
590 | (xyz0[0]-xyz1[0])*(xyz0[0]-xyz1[0]) + |
591 | (xyz0[1]-xyz1[1])*(xyz0[1]-xyz1[1]) + |
592 | (xyz0[2]-xyz1[2])*(xyz0[2]-xyz1[2]) |
593 | ); |
594 | if(length>0.){ |
595 | // Get material budget |
596 | Double_t param[7]; |
597 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) break; |
598 | Double_t xrho= param[0]*param[4]; |
599 | Double_t xx0 = param[1]; // Get mean propagation parameters |
600 | |
601 | // Propagate and update |
602 | t.PropagateTo(x, xx0, xrho); |
603 | if (!AdjustSector(&t)) break; |
604 | } |
e3cf3d02 |
605 | if(kStoreIn){ |
606 | t.SetTrackHigh(); |
607 | kStoreIn = kFALSE; |
608 | } |
609 | |
b72f4eaf |
610 | Double_t cov[3]; tracklet->GetCovAt(x, cov); |
611 | Double_t p[2] = { tracklet->GetY(), tracklet->GetZ()}; |
612 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); |
613 | if (chi2 < 1e+10 && t.Update(p, cov, chi2)){ |
41702fec |
614 | nClustersExpected += tracklet->GetN(); |
615 | } |
616 | } |
617 | |
3a039a31 |
618 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
41702fec |
619 | Int_t index; |
51a23065 |
620 | for(int iplane=0; iplane<AliTRDgeometry::kNlayer; iplane++){ |
41702fec |
621 | AliTRDseedV1 *tracklet = GetTracklet(&t, iplane, index); |
622 | if(!tracklet) continue; |
623 | t.SetTracklet(tracklet, index); |
624 | } |
625 | |
626 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
29f95561 |
627 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
eb2b4f91 |
628 | AliTRDtrackV1 track(t); |
629 | track.SetOwner(); |
41702fec |
630 | cstreamer << "FollowProlongation" |
631 | << "EventNumber=" << eventNumber |
632 | << "ncl=" << nClustersExpected |
eb2b4f91 |
633 | << "track.=" << &track |
41702fec |
634 | << "\n"; |
635 | } |
636 | |
637 | return nClustersExpected; |
0906e73e |
638 | |
639 | } |
640 | |
641 | //_____________________________________________________________________________ |
642 | Int_t AliTRDtrackerV1::FollowBackProlongation(AliTRDtrackV1 &t) |
643 | { |
afa21247 |
644 | // Extrapolates/Build the TRD track in the TOF direction. |
645 | // |
646 | // Parameters |
647 | // t : the TRD track which has to be extrapolated |
648 | // |
649 | // Output |
650 | // number of clusters attached to the track |
651 | // |
652 | // Starting from current radial position of track <t> this function |
653 | // extrapolates the track through the 6 TRD layers. The following steps |
654 | // are being performed for each plane: |
655 | // 1. Propagate track to the entrance of the next chamber: |
656 | // - get chamber limits in the radial direction |
657 | // - check crossing sectors |
658 | // - check track inclination |
659 | // - check track prolongation against boundary conditions (see exclusion boundaries on AliTRDgeometry::IsOnBoundary()) |
660 | // 2. Build tracklet (see AliTRDseed::AttachClusters() for details) for this layer if needed. If only |
661 | // Kalman filter is needed and tracklets are already linked to the track this step is skipped. |
662 | // 3. Fit tracklet using the information from the Kalman filter. |
663 | // 4. Propagate and update track at reference radial position of the tracklet. |
664 | // 5. Register tracklet with the tracker and track; update pulls monitoring. |
665 | // |
666 | // Observation |
2a3191bb |
667 | // 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: |
668 | // - AliTRDtrackV1::kProlongation : track prolongation failed |
669 | // - AliTRDtrackV1::kPropagation : track prolongation failed |
670 | // - AliTRDtrackV1::kAdjustSector : failed during sector crossing |
671 | // - AliTRDtrackV1::kSnp : too large bending |
672 | // - AliTRDtrackV1::kTrackletInit : fail to initialize tracklet |
673 | // - AliTRDtrackV1::kUpdate : fail to attach clusters or fit the tracklet |
674 | // - AliTRDtrackV1::kUnknown : anything which is not covered before |
afa21247 |
675 | // 2. By default the status of the track before first TRD update is saved. |
676 | // |
677 | // Debug level 2 |
678 | // |
679 | // Author |
680 | // Alexandru Bercuci <A.Bercuci@gsi.de> |
681 | // |
41702fec |
682 | |
eb2b4f91 |
683 | Int_t n = 0; |
684 | Double_t driftLength = .5*AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick(); |
41702fec |
685 | AliTRDtrackingChamber *chamber = 0x0; |
686 | |
3b57a3f7 |
687 | AliTRDseedV1 tracklet, *ptrTracklet = 0x0; |
181d2c97 |
688 | // in case of stand alone tracking we store all the pointers to the tracklets in a temporary array |
689 | AliTRDseedV1 *tracklets[kNPlanes]; |
690 | memset(tracklets, 0, sizeof(AliTRDseedV1 *) * kNPlanes); |
691 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
692 | tracklets[ip] = t.GetTracklet(ip); |
693 | t.UnsetTracklet(ip); |
694 | } |
81a6494d |
695 | Bool_t kStoreIn = kTRUE, kPropagateIn = kTRUE; |
e3cf3d02 |
696 | |
053767a4 |
697 | // Loop through the TRD layers |
eb2b4f91 |
698 | TGeoHMatrix *matrix = 0x0; |
699 | Double_t x, y, z; |
700 | for (Int_t ily=0, sm=-1, stk=-1, det=-1; ily < AliTRDgeometry::kNlayer; ily++) { |
701 | // rough estimate of the entry point |
702 | if (!t.GetProlongation(fR[ily], y, z)){ |
703 | n=-1; |
704 | t.SetStatus(AliTRDtrackV1::kProlongation); |
705 | break; |
706 | } |
41702fec |
707 | |
eb2b4f91 |
708 | // find sector / stack / detector |
709 | sm = t.GetSector(); |
710 | // TODO cross check with y value ! |
711 | stk = fGeom->GetStack(z, ily); |
712 | det = stk>=0 ? AliTRDgeometry::GetDetector(ily, stk, sm) : -1; |
713 | matrix = det>=0 ? fGeom->GetClusterMatrix(det) : 0x0; |
714 | |
715 | // check if supermodule/chamber is installed |
716 | if( !fGeom->GetSMstatus(sm) || |
717 | stk<0. || |
718 | fGeom->IsHole(ily, stk, sm) || |
719 | !matrix ){ |
720 | // propagate to the default radial position |
721 | if(fR[ily] > (fgkMaxStep + t.GetX()) && !PropagateToX(t, fR[ily], fgkMaxStep)){ |
722 | n=-1; |
723 | t.SetStatus(AliTRDtrackV1::kPropagation); |
41702fec |
724 | break; |
725 | } |
eb2b4f91 |
726 | if(!AdjustSector(&t)){ |
727 | n=-1; |
728 | t.SetStatus(AliTRDtrackV1::kAdjustSector); |
729 | break; |
730 | } |
731 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp){ |
732 | n=-1; |
733 | t.SetStatus(AliTRDtrackV1::kSnp); |
734 | break; |
735 | } |
736 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); |
41702fec |
737 | continue; |
738 | } |
e3cf3d02 |
739 | |
eb2b4f91 |
740 | // retrieve rotation matrix for the current chamber |
741 | Double_t loc[] = {AliTRDgeometry::AnodePos()- driftLength, 0., 0.}; |
742 | Double_t glb[] = {0., 0., 0.}; |
743 | matrix->LocalToMaster(loc, glb); |
744 | |
745 | // Propagate to the radial distance of the current layer |
746 | x = glb[0] - fgkMaxStep; |
747 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)){ |
748 | n=-1; |
749 | t.SetStatus(AliTRDtrackV1::kPropagation); |
750 | break; |
751 | } |
752 | if(!AdjustSector(&t)){ |
753 | n=-1; |
754 | t.SetStatus(AliTRDtrackV1::kAdjustSector); |
755 | break; |
756 | } |
757 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { |
758 | n=-1; |
759 | t.SetStatus(AliTRDtrackV1::kSnp); |
760 | break; |
761 | } |
762 | Bool_t RECALCULATE = kFALSE; |
763 | if(sm != t.GetSector()){ |
764 | sm = t.GetSector(); |
765 | RECALCULATE = kTRUE; |
766 | } |
767 | if(stk != fGeom->GetStack(z, ily)){ |
768 | stk = fGeom->GetStack(z, ily); |
769 | RECALCULATE = kTRUE; |
770 | } |
771 | if(RECALCULATE){ |
772 | det = AliTRDgeometry::GetDetector(ily, stk, sm); |
773 | if(!(matrix = fGeom->GetClusterMatrix(det))){ |
774 | t.SetStatus(AliTRDtrackV1::kGeometry, ily); |
775 | continue; |
776 | } |
777 | matrix->LocalToMaster(loc, glb); |
778 | x = glb[0] - fgkMaxStep; |
779 | } |
780 | |
781 | // check if track is well inside fiducial volume |
782 | if (!t.GetProlongation(x+fgkMaxStep, y, z)) { |
783 | n=-1; |
784 | t.SetStatus(AliTRDtrackV1::kProlongation); |
785 | break; |
786 | } |
787 | if(fGeom->IsOnBoundary(det, y, z, .5)){ |
788 | t.SetStatus(AliTRDtrackV1::kBoundary, ily); |
789 | continue; |
790 | } |
791 | // mark track as entering the FIDUCIAL volume of TRD |
e3cf3d02 |
792 | if(kStoreIn){ |
793 | t.SetTrackLow(); |
794 | kStoreIn = kFALSE; |
795 | } |
b1957d3c |
796 | |
eb2b4f91 |
797 | ptrTracklet = tracklets[ily]; |
798 | if(!ptrTracklet){ // BUILD TRACKLET |
799 | // check data in supermodule |
800 | if(!fTrSec[sm].GetNChambers()){ |
801 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
802 | continue; |
803 | } |
804 | if(fTrSec[sm].GetX(ily) < 1.){ |
805 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
806 | continue; |
807 | } |
808 | |
809 | // check data in chamber |
810 | if(!(chamber = fTrSec[sm].GetChamber(stk, ily))){ |
811 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
812 | continue; |
813 | } |
814 | if(chamber->GetNClusters() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){ |
815 | t.SetStatus(AliTRDtrackV1::kNoClusters, ily); |
816 | continue; |
817 | } |
818 | // build tracklet |
819 | ptrTracklet = new(&tracklet) AliTRDseedV1(det); |
820 | ptrTracklet->SetReconstructor(fReconstructor); |
821 | ptrTracklet->SetKink(t.IsKink()); |
822 | ptrTracklet->SetPadPlane(fGeom->GetPadPlane(ily, stk)); |
823 | ptrTracklet->SetX0(glb[0]+driftLength); |
824 | if(!tracklet.Init(&t)){ |
825 | n=-1; |
826 | t.SetStatus(AliTRDtrackV1::kTrackletInit); |
827 | break; |
828 | } |
829 | if(!tracklet.AttachClusters(chamber, kTRUE)){ |
830 | t.SetStatus(AliTRDtrackV1::kNoAttach, ily); |
831 | continue; |
832 | } |
833 | if(tracklet.GetN() < fgNTimeBins*fReconstructor->GetRecoParam() ->GetFindableClusters()){ |
834 | t.SetStatus(AliTRDtrackV1::kNoClustersTracklet, ily); |
835 | continue; |
836 | } |
837 | ptrTracklet->UpdateUsed(); |
838 | } |
eb2b4f91 |
839 | // propagate track to the radial position of the tracklet |
840 | ptrTracklet->UseClusters(); // TODO ? do we need this here ? |
841 | // fit tracklet no tilt correction |
842 | if(!ptrTracklet->Fit(kFALSE)){ |
843 | t.SetStatus(AliTRDtrackV1::kNoFit, ily); |
844 | continue; |
845 | } |
846 | x = ptrTracklet->GetX(); //GetX0(); |
847 | if(x > (fgkMaxStep + t.GetX()) && !PropagateToX(t, x, fgkMaxStep)) { |
848 | n=-1; |
849 | t.SetStatus(AliTRDtrackV1::kPropagation); |
850 | break; |
851 | } |
852 | if(!AdjustSector(&t)) { |
853 | n=-1; |
854 | t.SetStatus(AliTRDtrackV1::kAdjustSector); |
855 | break; |
41702fec |
856 | } |
eb2b4f91 |
857 | if(TMath::Abs(t.GetSnp()) > fgkMaxSnp) { |
858 | n=-1; |
859 | t.SetStatus(AliTRDtrackV1::kSnp); |
860 | break; |
861 | } |
81a6494d |
862 | if(kPropagateIn){ |
863 | t.SetTrackLow(); |
864 | kPropagateIn = kFALSE; |
865 | } |
b72f4eaf |
866 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
867 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; |
868 | Double_t chi2 = ((AliExternalTrackParam)t).GetPredictedChi2(p, cov); |
6e39bde4 |
869 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){ |
870 | Double_t ytrack = ptrTracklet->GetYref(0); |
871 | Double_t ztrack = ptrTracklet->GetZref(0); |
872 | Double_t ytracklet = ptrTracklet->GetYfit(0); |
873 | Double_t ztracklet = ptrTracklet->GetZfit(0); |
874 | Double_t phitrack = ptrTracklet->GetYref(1); |
875 | Double_t phitracklet = ptrTracklet->GetYfit(1); |
876 | Double_t thetatrack = ptrTracklet->GetZref(1); |
877 | Double_t thetatracklet = ptrTracklet->GetZfit(1); |
878 | |
879 | TTreeSRedirector &mystreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
880 | mystreamer << "FollowBackProlongation1" |
881 | << "il=" << ily |
882 | << "x=" << x |
883 | << "ytrack=" << ytrack |
884 | << "ztrack=" << ztrack |
885 | << "ytracklet=" << ytracklet |
886 | << "ztracklet=" << ztracklet |
887 | << "phitrack=" << phitrack |
888 | << "thetatrack=" << thetatrack |
889 | << "phitracklet=" << phitracklet |
890 | << "thetatracklet=" << thetatracklet |
891 | << "chi2=" << chi2 |
892 | << "\n"; |
893 | } |
894 | // update Kalman with the TRD measurement |
b72f4eaf |
895 | if(chi2>1e+10){ // TODO |
eb2b4f91 |
896 | t.SetStatus(AliTRDtrackV1::kChi2, ily); |
897 | continue; |
898 | } |
b72f4eaf |
899 | if(!t.Update(p, cov, chi2)) { |
eb2b4f91 |
900 | n=-1; |
901 | t.SetStatus(AliTRDtrackV1::kUpdate); |
902 | break; |
903 | } |
b72f4eaf |
904 | // fill residuals ?! |
905 | AliTracker::FillResiduals(&t, p, cov, ptrTracklet->GetVolumeId()); |
906 | |
eb2b4f91 |
907 | |
908 | // load tracklet to the tracker |
16cca13f |
909 | ptrTracklet->Update(&t); |
eb2b4f91 |
910 | ptrTracklet = SetTracklet(ptrTracklet); |
911 | t.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
912 | n += ptrTracklet->GetN(); |
913 | |
41702fec |
914 | // Reset material budget if 2 consecutive gold |
eb2b4f91 |
915 | // if(ilayer>0 && t.GetTracklet(ilayer-1) && ptrTracklet->GetN() + t.GetTracklet(ilayer-1)->GetN() > 20) t.SetBudget(2, 0.); |
41702fec |
916 | |
917 | // Make backup of the track until is gold |
918 | // TO DO update quality check of the track. |
919 | // consider comparison with fTimeBinsRange |
920 | Float_t ratio0 = ptrTracklet->GetN() / Float_t(fgNTimeBins); |
921 | //Float_t ratio1 = Float_t(t.GetNumberOfClusters()+1) / Float_t(t.GetNExpected()+1); |
41702fec |
922 | |
eb2b4f91 |
923 | if( (chi2 < 18.0) && |
41702fec |
924 | (ratio0 > 0.8) && |
925 | //(ratio1 > 0.6) && |
926 | //(ratio0+ratio1 > 1.5) && |
927 | (t.GetNCross() == 0) && |
928 | (TMath::Abs(t.GetSnp()) < 0.85) && |
e3cf3d02 |
929 | (t.GetNumberOfClusters() > 20)){ |
930 | t.MakeBackupTrack(); |
931 | } |
053767a4 |
932 | } // end layers loop |
eb2b4f91 |
933 | //printf("clusters[%d] chi2[%f] x[%f] status[%d ", n, t.GetChi2(), t.GetX(), t.GetStatusTRD()); |
934 | //for(int i=0; i<6; i++) printf("%d ", t.GetStatusTRD(i)); printf("]\n"); |
41702fec |
935 | |
3a039a31 |
936 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
29f95561 |
937 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
938 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
eb2b4f91 |
939 | AliTRDtrackV1 track(t); |
940 | track.SetOwner(); |
41702fec |
941 | cstreamer << "FollowBackProlongation" |
eb2b4f91 |
942 | << "EventNumber=" << eventNumber |
943 | << "ncl=" << n |
944 | << "track.=" << &track |
41702fec |
945 | << "\n"; |
946 | } |
947 | |
eb2b4f91 |
948 | return n; |
0906e73e |
949 | } |
950 | |
eb38ed55 |
951 | //_________________________________________________________________________ |
952 | Float_t AliTRDtrackerV1::FitRieman(AliTRDseedV1 *tracklets, Double_t *chi2, Int_t *planes){ |
41702fec |
953 | // |
954 | // Fits a Riemann-circle to the given points without tilting pad correction. |
955 | // The fit is performed using an instance of the class AliRieman (equations |
956 | // and transformations see documentation of this class) |
957 | // Afterwards all the tracklets are Updated |
958 | // |
959 | // Parameters: - Array of tracklets (AliTRDseedV1) |
960 | // - Storage for the chi2 values (beginning with direction z) |
961 | // - Seeding configuration |
962 | // Output: - The curvature |
963 | // |
964 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); |
965 | fitter->Reset(); |
966 | Int_t allplanes[] = {0, 1, 2, 3, 4, 5}; |
967 | Int_t *ppl = &allplanes[0]; |
968 | Int_t maxLayers = 6; |
969 | if(planes){ |
970 | maxLayers = 4; |
971 | ppl = planes; |
972 | } |
973 | for(Int_t il = 0; il < maxLayers; il++){ |
974 | if(!tracklets[ppl[il]].IsOK()) continue; |
e3cf3d02 |
975 | fitter->AddPoint(tracklets[ppl[il]].GetX0(), tracklets[ppl[il]].GetYfit(0), tracklets[ppl[il]].GetZfit(0),1,10); |
41702fec |
976 | } |
977 | fitter->Update(); |
978 | // Set the reference position of the fit and calculate the chi2 values |
979 | memset(chi2, 0, sizeof(Double_t) * 2); |
980 | for(Int_t il = 0; il < maxLayers; il++){ |
981 | // Reference positions |
982 | tracklets[ppl[il]].Init(fitter); |
983 | |
984 | // chi2 |
985 | if((!tracklets[ppl[il]].IsOK()) && (!planes)) continue; |
986 | chi2[0] += tracklets[ppl[il]].GetChi2Y(); |
987 | chi2[1] += tracklets[ppl[il]].GetChi2Z(); |
988 | } |
989 | return fitter->GetC(); |
eb38ed55 |
990 | } |
991 | |
992 | //_________________________________________________________________________ |
993 | void AliTRDtrackerV1::FitRieman(AliTRDcluster **seedcl, Double_t chi2[2]) |
994 | { |
41702fec |
995 | // |
996 | // Performs a Riemann helix fit using the seedclusters as spacepoints |
997 | // Afterwards the chi2 values are calculated and the seeds are updated |
998 | // |
999 | // Parameters: - The four seedclusters |
1000 | // - The tracklet array (AliTRDseedV1) |
1001 | // - The seeding configuration |
1002 | // - Chi2 array |
1003 | // |
1004 | // debug level 2 |
1005 | // |
1006 | AliRieman *fitter = AliTRDtrackerV1::GetRiemanFitter(); |
1007 | fitter->Reset(); |
a3743898 |
1008 | for(Int_t i = 0; i < 4; i++){ |
a3743898 |
1009 | fitter->AddPoint(seedcl[i]->GetX(), seedcl[i]->GetY(), seedcl[i]->GetZ(), 1., 10.); |
1010 | } |
41702fec |
1011 | fitter->Update(); |
1012 | |
1013 | |
1014 | // Update the seed and calculated the chi2 value |
1015 | chi2[0] = 0; chi2[1] = 0; |
1016 | for(Int_t ipl = 0; ipl < kNSeedPlanes; ipl++){ |
1017 | // chi2 |
1018 | chi2[0] += (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetZ() - fitter->GetZat(seedcl[ipl]->GetX())); |
1019 | chi2[1] += (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())) * (seedcl[ipl]->GetY() - fitter->GetYat(seedcl[ipl]->GetX())); |
1020 | } |
eb38ed55 |
1021 | } |
1022 | |
1023 | |
1024 | //_________________________________________________________________________ |
1025 | Float_t AliTRDtrackerV1::FitTiltedRiemanConstraint(AliTRDseedV1 *tracklets, Double_t zVertex) |
1026 | { |
41702fec |
1027 | // |
1028 | // Fits a helix to the clusters. Pad tilting is considered. As constraint it is |
1029 | // assumed that the vertex position is set to 0. |
1030 | // This method is very usefull for high-pt particles |
1031 | // Basis for the fit: (x - x0)^2 + (y - y0)^2 - R^2 = 0 |
1032 | // x0, y0: Center of the circle |
1033 | // Measured y-position: ymeas = y - tan(phiT)(zc - zt) |
1034 | // zc: center of the pad row |
1035 | // Equation which has to be fitted (after transformation): |
1036 | // a + b * u + e * v + 2*(ymeas + tan(phiT)(z - zVertex))*t = 0 |
1037 | // Transformation: |
1038 | // t = 1/(x^2 + y^2) |
1039 | // u = 2 * x * t |
1040 | // v = 2 * x * tan(phiT) * t |
1041 | // Parameters in the equation: |
1042 | // a = -1/y0, b = x0/y0, e = dz/dx |
1043 | // |
1044 | // The Curvature is calculated by the following equation: |
1045 | // - curv = a/Sqrt(b^2 + 1) = 1/R |
1046 | // Parameters: - the 6 tracklets |
1047 | // - the Vertex constraint |
1048 | // Output: - the Chi2 value of the track |
1049 | // |
1050 | // debug level 5 |
1051 | // |
1052 | |
1053 | TLinearFitter *fitter = GetTiltedRiemanFitterConstraint(); |
1054 | fitter->StoreData(kTRUE); |
1055 | fitter->ClearPoints(); |
1056 | AliTRDcluster *cl = 0x0; |
1057 | |
1058 | Float_t x, y, z, w, t, error, tilt; |
1059 | Double_t uvt[2]; |
1060 | Int_t nPoints = 0; |
053767a4 |
1061 | for(Int_t ilr = 0; ilr < AliTRDgeometry::kNlayer; ilr++){ |
1062 | if(!tracklets[ilr].IsOK()) continue; |
8d2bec9e |
1063 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
053767a4 |
1064 | if(!tracklets[ilr].IsUsable(itb)) continue; |
1065 | cl = tracklets[ilr].GetClusters(itb); |
1742f24c |
1066 | if(!cl->IsInChamber()) continue; |
41702fec |
1067 | x = cl->GetX(); |
1068 | y = cl->GetY(); |
1069 | z = cl->GetZ(); |
053767a4 |
1070 | tilt = tracklets[ilr].GetTilt(); |
41702fec |
1071 | // Transformation |
1072 | t = 1./(x * x + y * y); |
1073 | uvt[0] = 2. * x * t; |
1074 | uvt[1] = 2. * x * t * tilt ; |
1075 | w = 2. * (y + tilt * (z - zVertex)) * t; |
78b7d24c |
1076 | error = 2. * TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) * t; |
41702fec |
1077 | fitter->AddPoint(uvt, w, error); |
1078 | nPoints++; |
1079 | } |
1080 | } |
1081 | fitter->Eval(); |
1082 | |
1083 | // Calculate curvature |
1084 | Double_t a = fitter->GetParameter(0); |
1085 | Double_t b = fitter->GetParameter(1); |
1086 | Double_t curvature = a/TMath::Sqrt(b*b + 1); |
1087 | |
1088 | Float_t chi2track = fitter->GetChisquare()/Double_t(nPoints); |
1089 | for(Int_t ip = 0; ip < AliTRDtrackerV1::kNPlanes; ip++) |
e3cf3d02 |
1090 | tracklets[ip].SetC(curvature); |
41702fec |
1091 | |
3a039a31 |
1092 | /* if(fReconstructor->GetStreamLevel() >= 5){ |
41702fec |
1093 | //Linear Model on z-direction |
1094 | Double_t xref = CalculateReferenceX(tracklets); // Relative to the middle of the stack |
1095 | Double_t slope = fitter->GetParameter(2); |
1096 | Double_t zref = slope * xref; |
1097 | Float_t chi2Z = CalculateChi2Z(tracklets, zref, slope, xref); |
1098 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1099 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
29f95561 |
1100 | TTreeSRedirector &treeStreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
1101 | treeStreamer << "FitTiltedRiemanConstraint" |
1102 | << "EventNumber=" << eventNumber |
1103 | << "CandidateNumber=" << candidateNumber |
1104 | << "Curvature=" << curvature |
1105 | << "Chi2Track=" << chi2track |
1106 | << "Chi2Z=" << chi2Z |
1107 | << "zref=" << zref |
1108 | << "\n"; |
3a039a31 |
1109 | }*/ |
41702fec |
1110 | return chi2track; |
eb38ed55 |
1111 | } |
1112 | |
1113 | //_________________________________________________________________________ |
1114 | Float_t AliTRDtrackerV1::FitTiltedRieman(AliTRDseedV1 *tracklets, Bool_t sigError) |
1115 | { |
41702fec |
1116 | // |
1117 | // Performs a Riemann fit taking tilting pad correction into account |
1118 | // The equation of a Riemann circle, where the y position is substituted by the |
1119 | // measured y-position taking pad tilting into account, has to be transformed |
1120 | // into a 4-dimensional hyperplane equation |
1121 | // Riemann circle: (x-x0)^2 + (y-y0)^2 -R^2 = 0 |
1122 | // Measured y-Position: ymeas = y - tan(phiT)(zc - zt) |
1123 | // zc: center of the pad row |
1124 | // zt: z-position of the track |
1125 | // The z-position of the track is assumed to be linear dependent on the x-position |
1126 | // Transformed equation: a + b * u + c * t + d * v + e * w - 2 * (ymeas + tan(phiT) * zc) * t = 0 |
1127 | // Transformation: u = 2 * x * t |
1128 | // v = 2 * tan(phiT) * t |
1129 | // w = 2 * tan(phiT) * (x - xref) * t |
1130 | // t = 1 / (x^2 + ymeas^2) |
1131 | // Parameters: a = -1/y0 |
1132 | // b = x0/y0 |
1133 | // c = (R^2 -x0^2 - y0^2)/y0 |
1134 | // d = offset |
1135 | // e = dz/dx |
1136 | // If the offset respectively the slope in z-position is impossible, the parameters are fixed using |
1137 | // results from the simple riemann fit. Afterwards the fit is redone. |
1138 | // The curvature is calculated according to the formula: |
1139 | // curv = a/(1 + b^2 + c*a) = 1/R |
1140 | // |
1141 | // Paramters: - Array of tracklets (connected to the track candidate) |
1142 | // - Flag selecting the error definition |
1143 | // Output: - Chi2 values of the track (in Parameter list) |
1144 | // |
1145 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1146 | fitter->StoreData(kTRUE); |
1147 | fitter->ClearPoints(); |
1148 | AliTRDLeastSquare zfitter; |
1149 | AliTRDcluster *cl = 0x0; |
1150 | |
1151 | Double_t xref = CalculateReferenceX(tracklets); |
6e39bde4 |
1152 | Double_t x, y, z, t, tilt, dx, w, we, erry, errz; |
1153 | Double_t uvt[4], sumPolY[5], sumPolZ[3]; |
1154 | memset(sumPolY, 0, sizeof(Double_t) * 5); |
1155 | memset(sumPolZ, 0, sizeof(Double_t) * 3); |
41702fec |
1156 | Int_t nPoints = 0; |
1157 | // Containers for Least-square fitter |
1158 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1159 | if(!tracklets[ipl].IsOK()) continue; |
ed15ef4f |
1160 | tilt = tracklets[ipl].GetTilt(); |
8d2bec9e |
1161 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec |
1162 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1742f24c |
1163 | if(!cl->IsInChamber()) continue; |
41702fec |
1164 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1165 | x = cl->GetX(); |
1166 | y = cl->GetY(); |
1167 | z = cl->GetZ(); |
41702fec |
1168 | dx = x - xref; |
1169 | // Transformation |
1170 | t = 1./(x*x + y*y); |
1171 | uvt[0] = 2. * x * t; |
1172 | uvt[1] = t; |
1173 | uvt[2] = 2. * tilt * t; |
1174 | uvt[3] = 2. * tilt * dx * t; |
1175 | w = 2. * (y + tilt*z) * t; |
1176 | // error definition changes for the different calls |
1177 | we = 2. * t; |
78b7d24c |
1178 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()+tilt*tilt*cl->GetSigmaZ2()) : 0.2; |
41702fec |
1179 | fitter->AddPoint(uvt, w, we); |
1180 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
6e39bde4 |
1181 | // adding points for covariance matrix estimation |
1182 | erry = 1./(TMath::Sqrt(cl->GetSigmaY2()) + 0.1); // 0.1 is a systematic error (due to misalignment and miscalibration) |
1183 | erry *= erry; |
1184 | errz = 1./cl->GetSigmaZ2(); |
1185 | for(Int_t ipol = 0; ipol < 5; ipol++){ |
1186 | sumPolY[ipol] += erry; |
1187 | erry *= x; |
1188 | if(ipol < 3){ |
1189 | sumPolZ[ipol] += errz; |
1190 | errz *= x; |
1191 | } |
1192 | } |
41702fec |
1193 | nPoints++; |
1194 | } |
1195 | } |
1196 | fitter->Eval(); |
1197 | zfitter.Eval(); |
1198 | |
1199 | Double_t offset = fitter->GetParameter(3); |
1200 | Double_t slope = fitter->GetParameter(4); |
1201 | |
1202 | // Linear fitter - not possible to make boundaries |
1203 | // Do not accept non possible z and dzdx combinations |
1204 | Bool_t acceptablez = kTRUE; |
1205 | Double_t zref = 0.0; |
1206 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
1207 | if(!tracklets[iLayer].IsOK()) continue; |
1208 | zref = offset + slope * (tracklets[iLayer].GetX0() - xref); |
e3cf3d02 |
1209 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
41702fec |
1210 | acceptablez = kFALSE; |
1211 | } |
1212 | if (!acceptablez) { |
1213 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1214 | Double_t zmf = zfitter.GetFunctionValue(&xref); |
1215 | fgTiltedRieman->FixParameter(3, zmf); |
1216 | fgTiltedRieman->FixParameter(4, dzmf); |
1217 | fitter->Eval(); |
1218 | fitter->ReleaseParameter(3); |
1219 | fitter->ReleaseParameter(4); |
1220 | offset = fitter->GetParameter(3); |
1221 | slope = fitter->GetParameter(4); |
1222 | } |
1223 | |
1224 | // Calculate Curvarture |
1225 | Double_t a = fitter->GetParameter(0); |
1226 | Double_t b = fitter->GetParameter(1); |
1227 | Double_t c = fitter->GetParameter(2); |
1228 | Double_t curvature = 1.0 + b*b - c*a; |
1229 | if (curvature > 0.0) |
1230 | curvature = a / TMath::Sqrt(curvature); |
1231 | |
1232 | Double_t chi2track = fitter->GetChisquare()/Double_t(nPoints); |
1233 | |
6e39bde4 |
1234 | // Prepare error calculation |
1235 | TMatrixD covarPolY(3,3); |
1236 | covarPolY(0,0) = sumPolY[0]; covarPolY(1,1) = sumPolY[2]; covarPolY(2,2) = sumPolY[4]; |
1237 | covarPolY(0,1) = covarPolY(1,0) = sumPolY[1]; |
1238 | covarPolY(0,2) = covarPolY(2,0) = sumPolY[2]; |
1239 | covarPolY(2,1) = covarPolY(1,2) = sumPolY[3]; |
1240 | covarPolY.Invert(); |
1241 | TMatrixD covarPolZ(2,2); |
1242 | covarPolZ(0,0) = sumPolZ[0]; covarPolZ(1,1) = sumPolZ[2]; |
1243 | covarPolZ(1,0) = covarPolZ(0,1) = sumPolZ[1]; |
1244 | covarPolZ.Invert(); |
1245 | |
41702fec |
1246 | // Update the tracklets |
6e39bde4 |
1247 | Double_t x1, dy, dz; |
1248 | Double_t cov[15]; |
1249 | memset(cov, 0, sizeof(Double_t) * 15); |
41702fec |
1250 | for(Int_t iLayer = 0; iLayer < AliTRDtrackerV1::kNPlanes; iLayer++) { |
1251 | |
1252 | x = tracklets[iLayer].GetX0(); |
6e39bde4 |
1253 | x1 = x - xref; |
41702fec |
1254 | y = 0; |
1255 | z = 0; |
1256 | dy = 0; |
1257 | dz = 0; |
6e39bde4 |
1258 | memset(cov, 0, sizeof(Double_t) * 3); |
1259 | TMatrixD transform(3,3); |
1260 | transform(0,0) = 1; |
1261 | transform(0,1) = x; |
1262 | transform(0,2) = x*x; |
1263 | transform(1,1) = 1; |
1264 | transform(1,2) = x; |
1265 | transform(2,2) = 1; |
1266 | TMatrixD covariance(transform, TMatrixD::kMult, covarPolY); |
1267 | covariance *= transform.T(); |
1268 | TMatrixD transformZ(2,2); |
1269 | transformZ(0,0) = transformZ(1,1) = 1; |
1270 | transformZ(0,1) = x; |
1271 | TMatrixD covarZ(transformZ, TMatrixD::kMult, covarPolZ); |
1272 | covarZ *= transformZ.T(); |
41702fec |
1273 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1274 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) |
1275 | // R = Sqrt() = 1/Curvature |
1276 | // => y = y0 +/- Sqrt(1/Curvature^2 - (x - x0)^2) |
1277 | Double_t res = (x * a + b); // = (x - x0)/y0 |
1278 | res *= res; |
1279 | res = 1.0 - c * a + b * b - res; // = (R^2 - (x - x0)^2)/y0^2 |
1280 | if (res >= 0) { |
1281 | res = TMath::Sqrt(res); |
1282 | y = (1.0 - res) / a; |
1283 | } |
6e39bde4 |
1284 | cov[0] = covariance(0,0); |
1285 | cov[2] = covarZ(0,0); |
1286 | cov[1] = 0.; |
41702fec |
1287 | |
1288 | // dy: R^2 = (x - x0)^2 + (y - y0)^2 |
1289 | // => y = +/- Sqrt(R^2 - (x - x0)^2) + y0 |
1290 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) |
1291 | // Curvature: cr = 1/R = a/Sqrt(1 + b^2 - c*a) |
1292 | // => dy/dx = (x - x0)/(1/(cr^2) - (x - x0)^2) |
1293 | Double_t x0 = -b / a; |
1294 | if (-c * a + b * b + 1 > 0) { |
1295 | if (1.0/(curvature * curvature) - (x - x0) * (x - x0) > 0.0) { |
6e39bde4 |
1296 | Double_t yderiv = (x - x0) / TMath::Sqrt(1.0/(curvature * curvature) - (x - x0) * (x - x0)); |
1297 | if (a < 0) yderiv *= -1.0; |
1298 | dy = yderiv; |
41702fec |
1299 | } |
1300 | } |
1301 | z = offset + slope * (x - xref); |
1302 | dz = slope; |
1303 | tracklets[iLayer].SetYref(0, y); |
1304 | tracklets[iLayer].SetYref(1, dy); |
1305 | tracklets[iLayer].SetZref(0, z); |
1306 | tracklets[iLayer].SetZref(1, dz); |
1307 | tracklets[iLayer].SetC(curvature); |
6e39bde4 |
1308 | tracklets[iLayer].SetCovRef(cov); |
41702fec |
1309 | tracklets[iLayer].SetChi2(chi2track); |
1310 | } |
1311 | |
3a039a31 |
1312 | /* if(fReconstructor->GetStreamLevel() >=5){ |
29f95561 |
1313 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
1314 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
1315 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
1316 | Double_t chi2z = CalculateChi2Z(tracklets, offset, slope, xref); |
1317 | cstreamer << "FitTiltedRieman0" |
1318 | << "EventNumber=" << eventNumber |
1319 | << "CandidateNumber=" << candidateNumber |
1320 | << "xref=" << xref |
1321 | << "Chi2Z=" << chi2z |
1322 | << "\n"; |
3a039a31 |
1323 | }*/ |
41702fec |
1324 | return chi2track; |
eb38ed55 |
1325 | } |
1326 | |
3b57a3f7 |
1327 | |
9e333711 |
1328 | //____________________________________________________________________ |
6e4d4425 |
1329 | Double_t AliTRDtrackerV1::FitLine(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t err, Int_t np, AliTrackPoint *points) |
9e333711 |
1330 | { |
1331 | AliTRDLeastSquare yfitter, zfitter; |
1332 | AliTRDcluster *cl = 0x0; |
1333 | |
1334 | AliTRDseedV1 work[kNPlanes], *tracklet = 0x0; |
1335 | if(!tracklets){ |
1336 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1337 | if(!(tracklet = track->GetTracklet(ipl))) continue; |
1338 | if(!tracklet->IsOK()) continue; |
1339 | new(&work[ipl]) AliTRDseedV1(*tracklet); |
1340 | } |
1341 | tracklets = &work[0]; |
1342 | } |
1343 | |
1344 | Double_t xref = CalculateReferenceX(tracklets); |
1345 | Double_t x, y, z, dx, ye, yr, tilt; |
1346 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1347 | if(!tracklets[ipl].IsOK()) continue; |
1348 | for(Int_t itb = 0; itb < fgNTimeBins; itb++){ |
1349 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1350 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1351 | x = cl->GetX(); |
1352 | z = cl->GetZ(); |
1353 | dx = x - xref; |
1354 | zfitter.AddPoint(&dx, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
1355 | } |
1356 | } |
1357 | zfitter.Eval(); |
1358 | Double_t z0 = zfitter.GetFunctionParameter(0); |
1359 | Double_t dzdx = zfitter.GetFunctionParameter(1); |
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 | y = cl->GetY(); |
1367 | z = cl->GetZ(); |
1368 | tilt = tracklets[ipl].GetTilt(); |
1369 | dx = x - xref; |
1370 | yr = y + tilt*(z - z0 - dzdx*dx); |
1371 | // error definition changes for the different calls |
1372 | ye = tilt*TMath::Sqrt(cl->GetSigmaZ2()); |
1373 | ye += err ? tracklets[ipl].GetSigmaY() : 0.2; |
1374 | yfitter.AddPoint(&dx, yr, ye); |
1375 | } |
1376 | } |
1377 | yfitter.Eval(); |
1378 | Double_t y0 = yfitter.GetFunctionParameter(0); |
1379 | Double_t dydx = yfitter.GetFunctionParameter(1); |
1380 | Double_t chi2 = 0.;//yfitter.GetChisquare()/Double_t(nPoints); |
1381 | |
1382 | //update track points array |
1383 | if(np && points){ |
1384 | Float_t xyz[3]; |
1385 | for(int ip=0; ip<np; ip++){ |
1386 | points[ip].GetXYZ(xyz); |
1387 | xyz[1] = y0 + dydx * (xyz[0] - xref); |
1388 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1389 | points[ip].SetXYZ(xyz); |
1390 | } |
1391 | } |
1392 | return chi2; |
1393 | } |
1394 | |
1395 | |
3b57a3f7 |
1396 | //_________________________________________________________________________ |
6e4d4425 |
1397 | Double_t AliTRDtrackerV1::FitRiemanTilt(const AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t sigError, Int_t np, AliTrackPoint *points) |
3b57a3f7 |
1398 | { |
0fa1a8ee |
1399 | // |
1400 | // Performs a Riemann fit taking tilting pad correction into account |
1401 | // |
1402 | // Paramters: - Array of tracklets (connected to the track candidate) |
1403 | // - Flag selecting the error definition |
1404 | // Output: - Chi2 values of the track (in Parameter list) |
1405 | // |
1406 | // The equations which has to be solved simultaneously are: |
1407 | // BEGIN_LATEX |
1408 | // R^{2} = (x-x_{0})^{2} + (y^{*}-y_{0})^{2} |
1409 | // y^{*} = y - tg(h)(z - z_{t}) |
1410 | // z_{t} = z_{0}+dzdx*(x-x_{r}) |
1411 | // END_LATEX |
1412 | // with (x, y, z) the coordinate of the cluster, (x_0, y_0, z_0) the coordinate of the center of the Riemann circle, |
1413 | // R its radius, x_r a constant refrence radial position in the middle of the TRD stack and dzdx the slope of the |
1414 | // track in the x-z plane. Using the following transformations |
1415 | // BEGIN_LATEX |
1416 | // t = 1 / (x^{2} + y^{2}) |
1417 | // u = 2 * x * t |
1418 | // v = 2 * tan(h) * t |
1419 | // w = 2 * tan(h) * (x - x_{r}) * t |
1420 | // END_LATEX |
1421 | // One gets the following linear equation |
1422 | // BEGIN_LATEX |
1423 | // a + b * u + c * t + d * v + e * w = 2 * (y + tg(h) * z) * t |
1424 | // END_LATEX |
1425 | // where the coefficients have the following meaning |
1426 | // BEGIN_LATEX |
1427 | // a = -1/y_{0} |
1428 | // b = x_{0}/y_{0} |
1429 | // c = (R^{2} -x_{0}^{2} - y_{0}^{2})/y_{0} |
1430 | // d = z_{0} |
1431 | // e = dz/dx |
1432 | // END_LATEX |
1433 | // The error calculation for the free term is thus |
1434 | // BEGIN_LATEX |
1435 | // #sigma = 2 * #sqrt{#sigma^{2}_{y} + (tilt corr ...) + tg^{2}(h) * #sigma^{2}_{z}} * t |
1436 | // END_LATEX |
1437 | // |
1438 | // From this simple model one can compute chi^2 estimates and a rough approximation of pt from the curvature according |
1439 | // to the formula: |
1440 | // BEGIN_LATEX |
1441 | // C = 1/R = a/(1 + b^{2} + c*a) |
1442 | // END_LATEX |
1443 | // |
1444 | // Authors |
1445 | // M.Ivanov <M.Ivanov@gsi.de> |
1446 | // A.Bercuci <A.Bercuci@gsi.de> |
1447 | // M.Fasel <M.Fasel@gsi.de> |
1448 | |
41702fec |
1449 | TLinearFitter *fitter = GetTiltedRiemanFitter(); |
1450 | fitter->StoreData(kTRUE); |
1451 | fitter->ClearPoints(); |
1452 | AliTRDLeastSquare zfitter; |
1453 | AliTRDcluster *cl = 0x0; |
3b57a3f7 |
1454 | |
1455 | AliTRDseedV1 work[kNPlanes], *tracklet = 0x0; |
1456 | if(!tracklets){ |
1457 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1458 | if(!(tracklet = track->GetTracklet(ipl))) continue; |
1459 | if(!tracklet->IsOK()) continue; |
1460 | new(&work[ipl]) AliTRDseedV1(*tracklet); |
1461 | } |
1462 | tracklets = &work[0]; |
1463 | } |
1464 | |
41702fec |
1465 | Double_t xref = CalculateReferenceX(tracklets); |
1466 | Double_t x, y, z, t, tilt, dx, w, we; |
1467 | Double_t uvt[4]; |
1468 | Int_t nPoints = 0; |
1469 | // Containers for Least-square fitter |
1470 | for(Int_t ipl = 0; ipl < kNPlanes; ipl++){ |
1471 | if(!tracklets[ipl].IsOK()) continue; |
8d2bec9e |
1472 | for(Int_t itb = 0; itb < AliTRDseedV1::kNclusters; itb++){ |
41702fec |
1473 | if(!(cl = tracklets[ipl].GetClusters(itb))) continue; |
1474 | if (!tracklets[ipl].IsUsable(itb)) continue; |
1475 | x = cl->GetX(); |
1476 | y = cl->GetY(); |
1477 | z = cl->GetZ(); |
1478 | tilt = tracklets[ipl].GetTilt(); |
1479 | dx = x - xref; |
1480 | // Transformation |
1481 | t = 1./(x*x + y*y); |
1482 | uvt[0] = 2. * x * t; |
1483 | uvt[1] = t; |
1484 | uvt[2] = 2. * tilt * t; |
1485 | uvt[3] = 2. * tilt * dx * t; |
1486 | w = 2. * (y + tilt*z) * t; |
1487 | // error definition changes for the different calls |
1488 | we = 2. * t; |
f29f13a6 |
1489 | we *= sigError ? TMath::Sqrt(cl->GetSigmaY2()) : 0.2; |
41702fec |
1490 | fitter->AddPoint(uvt, w, we); |
1491 | zfitter.AddPoint(&x, z, static_cast<Double_t>(TMath::Sqrt(cl->GetSigmaZ2()))); |
1492 | nPoints++; |
1493 | } |
1494 | } |
aec26713 |
1495 | if(fitter->Eval()) return 1.E10; |
1496 | |
41702fec |
1497 | Double_t z0 = fitter->GetParameter(3); |
1498 | Double_t dzdx = fitter->GetParameter(4); |
3b57a3f7 |
1499 | |
1500 | |
1501 | // Linear fitter - not possible to make boundaries |
1502 | // Do not accept non possible z and dzdx combinations |
1503 | Bool_t accept = kTRUE; |
1504 | Double_t zref = 0.0; |
1505 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
1506 | if(!tracklets[iLayer].IsOK()) continue; |
1507 | zref = z0 + dzdx * (tracklets[iLayer].GetX0() - xref); |
e3cf3d02 |
1508 | if (TMath::Abs(tracklets[iLayer].GetZfit(0) - zref) > tracklets[iLayer].GetPadLength() * 0.5 + 1.0) |
3b57a3f7 |
1509 | accept = kFALSE; |
1510 | } |
1511 | if (!accept) { |
41702fec |
1512 | zfitter.Eval(); |
3b57a3f7 |
1513 | Double_t dzmf = zfitter.GetFunctionParameter(1); |
1514 | Double_t zmf = zfitter.GetFunctionValue(&xref); |
1515 | fitter->FixParameter(3, zmf); |
1516 | fitter->FixParameter(4, dzmf); |
1517 | fitter->Eval(); |
1518 | fitter->ReleaseParameter(3); |
1519 | fitter->ReleaseParameter(4); |
1520 | z0 = fitter->GetParameter(3); // = zmf ? |
1521 | dzdx = fitter->GetParameter(4); // = dzmf ? |
1522 | } |
1523 | |
1524 | // Calculate Curvature |
1525 | Double_t a = fitter->GetParameter(0); |
1526 | Double_t b = fitter->GetParameter(1); |
1527 | Double_t c = fitter->GetParameter(2); |
1528 | Double_t y0 = 1. / a; |
1529 | Double_t x0 = -b * y0; |
a015e406 |
1530 | Double_t tmp = y0*y0 + x0*x0 - c*y0; |
1531 | if(tmp<=0.) return 1.E10; |
1532 | Double_t R = TMath::Sqrt(tmp); |
3b57a3f7 |
1533 | Double_t C = 1.0 + b*b - c*a; |
1534 | if (C > 0.0) C = a / TMath::Sqrt(C); |
1535 | |
1536 | // Calculate chi2 of the fit |
1537 | Double_t chi2 = fitter->GetChisquare()/Double_t(nPoints); |
1538 | |
1539 | // Update the tracklets |
1540 | if(!track){ |
1541 | for(Int_t ip = 0; ip < kNPlanes; ip++) { |
1542 | x = tracklets[ip].GetX0(); |
90cf7133 |
1543 | tmp = R*R-(x-x0)*(x-x0); |
a015e406 |
1544 | if(tmp <= 0.) continue; |
1545 | tmp = TMath::Sqrt(tmp); |
3b57a3f7 |
1546 | |
1547 | // y: R^2 = (x - x0)^2 + (y - y0)^2 |
1548 | // => y = y0 +/- Sqrt(R^2 - (x - x0)^2) |
1549 | tracklets[ip].SetYref(0, y0 - (y0>0.?1.:-1)*tmp); |
1550 | // => dy/dx = (x - x0)/Sqrt(R^2 - (x - x0)^2) |
1551 | tracklets[ip].SetYref(1, (x - x0) / tmp); |
1552 | tracklets[ip].SetZref(0, z0 + dzdx * (x - xref)); |
1553 | tracklets[ip].SetZref(1, dzdx); |
1554 | tracklets[ip].SetC(C); |
1555 | tracklets[ip].SetChi2(chi2); |
1556 | } |
1557 | } |
3b57a3f7 |
1558 | //update track points array |
1559 | if(np && points){ |
1560 | Float_t xyz[3]; |
1561 | for(int ip=0; ip<np; ip++){ |
1562 | points[ip].GetXYZ(xyz); |
60e55aee |
1563 | xyz[1] = TMath::Abs(xyz[0] - x0) > R ? 100. : y0 - (y0>0.?1.:-1.)*TMath::Sqrt((R-(xyz[0]-x0))*(R+(xyz[0]-x0))); |
3b57a3f7 |
1564 | xyz[2] = z0 + dzdx * (xyz[0] - xref); |
1565 | points[ip].SetXYZ(xyz); |
1566 | } |
1567 | } |
1568 | |
3b57a3f7 |
1569 | return chi2; |
1570 | } |
1571 | |
1572 | |
1bf51039 |
1573 | //____________________________________________________________________ |
1574 | Double_t AliTRDtrackerV1::FitKalman(AliTRDtrackV1 *track, AliTRDseedV1 *tracklets, Bool_t up, Int_t np, AliTrackPoint *points) |
1575 | { |
1576 | // Kalman filter implementation for the TRD. |
1577 | // It returns the positions of the fit in the array "points" |
1578 | // |
1579 | // Author : A.Bercuci@gsi.de |
1580 | |
3cfaffa4 |
1581 | // printf("Start track @ x[%f]\n", track->GetX()); |
1bf51039 |
1582 | |
1583 | //prepare marker points along the track |
1584 | Int_t ip = np ? 0 : 1; |
1585 | while(ip<np){ |
1586 | if((up?-1:1) * (track->GetX() - points[ip].GetX()) > 0.) break; |
1587 | //printf("AliTRDtrackerV1::FitKalman() : Skip track marker x[%d] = %7.3f. Before track start ( %7.3f ).\n", ip, points[ip].GetX(), track->GetX()); |
1588 | ip++; |
1589 | } |
1590 | //if(points) printf("First marker point @ x[%d] = %f\n", ip, points[ip].GetX()); |
1591 | |
1592 | |
1593 | AliTRDseedV1 tracklet, *ptrTracklet = 0x0; |
1594 | |
1595 | //Loop through the TRD planes |
1596 | for (Int_t jplane = 0; jplane < kNPlanes; jplane++) { |
1597 | // GET TRACKLET OR BUILT IT |
1598 | Int_t iplane = up ? jplane : kNPlanes - 1 - jplane; |
1599 | if(tracklets){ |
1600 | if(!(ptrTracklet = &tracklets[iplane])) continue; |
1601 | }else{ |
1602 | if(!(ptrTracklet = track->GetTracklet(iplane))){ |
1603 | /*AliTRDtrackerV1 *tracker = 0x0; |
1604 | if(!(tracker = dynamic_cast<AliTRDtrackerV1*>( AliTRDReconstructor::Tracker()))) continue; |
1605 | ptrTracklet = new(&tracklet) AliTRDseedV1(iplane); |
1606 | if(!tracker->MakeTracklet(ptrTracklet, track)) */ |
1607 | continue; |
1608 | } |
1609 | } |
1610 | if(!ptrTracklet->IsOK()) continue; |
1611 | |
1612 | Double_t x = ptrTracklet->GetX0(); |
1613 | |
1614 | while(ip < np){ |
1615 | //don't do anything if next marker is after next update point. |
1616 | if((up?-1:1) * (points[ip].GetX() - x) - fgkMaxStep < 0) break; |
1bf51039 |
1617 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1618 | |
1619 | Double_t xyz[3]; // should also get the covariance |
3cfaffa4 |
1620 | track->GetXYZ(xyz); |
1621 | track->Global2LocalPosition(xyz, track->GetAlpha()); |
1622 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); |
1bf51039 |
1623 | ip++; |
1624 | } |
3cfaffa4 |
1625 | // printf("plane[%d] tracklet[%p] x[%f]\n", iplane, ptrTracklet, x); |
1bf51039 |
1626 | |
3cfaffa4 |
1627 | // Propagate closer to the next update point |
1bf51039 |
1628 | if(((up?-1:1) * (x - track->GetX()) + fgkMaxStep < 0) && !PropagateToX(*track, x + (up?-1:1)*fgkMaxStep, fgkMaxStep)) return -1.; |
1629 | |
1630 | if(!AdjustSector(track)) return -1; |
1631 | if(TMath::Abs(track->GetSnp()) > fgkMaxSnp) return -1; |
1632 | |
1633 | //load tracklet to the tracker and the track |
1634 | /* Int_t index; |
1635 | if((index = FindTracklet(ptrTracklet)) < 0){ |
1636 | ptrTracklet = SetTracklet(&tracklet); |
1637 | index = fTracklets->GetEntriesFast()-1; |
1638 | } |
1639 | track->SetTracklet(ptrTracklet, index);*/ |
1640 | |
1641 | |
1642 | // register tracklet to track with tracklet creation !! |
1643 | // PropagateBack : loaded tracklet to the tracker and update index |
1644 | // RefitInward : update index |
1645 | // MakeTrack : loaded tracklet to the tracker and update index |
1646 | if(!tracklets) track->SetTracklet(ptrTracklet, -1); |
1647 | |
1648 | |
1649 | //Calculate the mean material budget along the path inside the chamber |
1650 | Double_t xyz0[3]; track->GetXYZ(xyz0); |
1651 | Double_t alpha = track->GetAlpha(); |
1652 | Double_t xyz1[3], y, z; |
1653 | if(!track->GetProlongation(x, y, z)) return -1; |
1654 | xyz1[0] = x * TMath::Cos(alpha) - y * TMath::Sin(alpha); |
1655 | xyz1[1] = +x * TMath::Sin(alpha) + y * TMath::Cos(alpha); |
1656 | xyz1[2] = z; |
3cfaffa4 |
1657 | 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 |
1658 | Double_t param[7]; |
3cfaffa4 |
1659 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param) <=0.) break; |
1bf51039 |
1660 | Double_t xrho = param[0]*param[4]; // density*length |
1661 | Double_t xx0 = param[1]; // radiation length |
1662 | |
1663 | //Propagate the track |
1664 | track->PropagateTo(x, xx0, xrho); |
1665 | if (!AdjustSector(track)) break; |
1666 | |
1667 | //Update track |
b72f4eaf |
1668 | Double_t cov[3]; ptrTracklet->GetCovAt(x, cov); |
1669 | Double_t p[2] = { ptrTracklet->GetY(), ptrTracklet->GetZ()}; |
1670 | Double_t chi2 = ((AliExternalTrackParam*)track)->GetPredictedChi2(p, cov); |
1671 | if(chi2<1e+10) track->Update(p, cov, chi2); |
1bf51039 |
1672 | if(!up) continue; |
1673 | |
1674 | //Reset material budget if 2 consecutive gold |
1675 | if(iplane>0 && track->GetTracklet(iplane-1) && ptrTracklet->GetN() + track->GetTracklet(iplane-1)->GetN() > 20) track->SetBudget(2, 0.); |
1676 | } // end planes loop |
1677 | |
1678 | // extrapolation |
1679 | while(ip < np){ |
1680 | if(((up?-1:1) * (points[ip].GetX() - track->GetX()) < 0) && !PropagateToX(*track, points[ip].GetX(), fgkMaxStep)) return -1.; |
1681 | |
1682 | Double_t xyz[3]; // should also get the covariance |
3cfaffa4 |
1683 | track->GetXYZ(xyz); |
1684 | track->Global2LocalPosition(xyz, track->GetAlpha()); |
1685 | points[ip].SetXYZ(xyz[0], xyz[1], xyz[2]); |
1bf51039 |
1686 | ip++; |
1687 | } |
1688 | |
1689 | return track->GetChi2(); |
1690 | } |
3b57a3f7 |
1691 | |
eb38ed55 |
1692 | //_________________________________________________________________________ |
bb56afff |
1693 | Float_t AliTRDtrackerV1::CalculateChi2Z(AliTRDseedV1 *tracklets, Double_t offset, Double_t slope, Double_t xref) |
eb38ed55 |
1694 | { |
41702fec |
1695 | // |
1696 | // Calculates the chi2-value of the track in z-Direction including tilting pad correction. |
1697 | // A linear dependence on the x-value serves as a model. |
1698 | // The parameters are related to the tilted Riemann fit. |
1699 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate |
1700 | // - the offset for the reference x |
1701 | // - the slope |
1702 | // - the reference x position |
1703 | // Output: - The Chi2 value of the track in z-Direction |
1704 | // |
1705 | Float_t chi2Z = 0, nLayers = 0; |
053767a4 |
1706 | for (Int_t iLayer = 0; iLayer < AliTRDgeometry::kNlayer; iLayer++) { |
41702fec |
1707 | if(!tracklets[iLayer].IsOK()) continue; |
1708 | Double_t z = offset + slope * (tracklets[iLayer].GetX0() - xref); |
e3cf3d02 |
1709 | chi2Z += TMath::Abs(tracklets[iLayer].GetZfit(0) - z); |
41702fec |
1710 | nLayers++; |
1711 | } |
1712 | chi2Z /= TMath::Max((nLayers - 3.0),1.0); |
1713 | return chi2Z; |
eb38ed55 |
1714 | } |
1715 | |
bccda319 |
1716 | //_____________________________________________________________________________ |
1717 | Int_t AliTRDtrackerV1::PropagateToX(AliTRDtrackV1 &t, Double_t xToGo, Double_t maxStep) |
1718 | { |
41702fec |
1719 | // |
1720 | // Starting from current X-position of track <t> this function |
1721 | // extrapolates the track up to radial position <xToGo>. |
1722 | // Returns 1 if track reaches the plane, and 0 otherwise |
1723 | // |
bccda319 |
1724 | |
41702fec |
1725 | const Double_t kEpsilon = 0.00001; |
bccda319 |
1726 | |
41702fec |
1727 | // Current track X-position |
1728 | Double_t xpos = t.GetX(); |
bccda319 |
1729 | |
41702fec |
1730 | // Direction: inward or outward |
1731 | Double_t dir = (xpos < xToGo) ? 1.0 : -1.0; |
bccda319 |
1732 | |
41702fec |
1733 | while (((xToGo - xpos) * dir) > kEpsilon) { |
bccda319 |
1734 | |
41702fec |
1735 | Double_t xyz0[3]; |
1736 | Double_t xyz1[3]; |
1737 | Double_t param[7]; |
1738 | Double_t x; |
1739 | Double_t y; |
1740 | Double_t z; |
bccda319 |
1741 | |
41702fec |
1742 | // The next step size |
1743 | Double_t step = dir * TMath::Min(TMath::Abs(xToGo-xpos),maxStep); |
bccda319 |
1744 | |
41702fec |
1745 | // Get the global position of the starting point |
1746 | t.GetXYZ(xyz0); |
bccda319 |
1747 | |
41702fec |
1748 | // X-position after next step |
1749 | x = xpos + step; |
bccda319 |
1750 | |
41702fec |
1751 | // Get local Y and Z at the X-position of the next step |
3352b455 |
1752 | if(t.GetProlongation(x,y,z)<0) return 0; // No prolongation possible |
bccda319 |
1753 | |
41702fec |
1754 | // The global position of the end point of this prolongation step |
1755 | xyz1[0] = x * TMath::Cos(t.GetAlpha()) - y * TMath::Sin(t.GetAlpha()); |
1756 | xyz1[1] = +x * TMath::Sin(t.GetAlpha()) + y * TMath::Cos(t.GetAlpha()); |
1757 | xyz1[2] = z; |
bccda319 |
1758 | |
41702fec |
1759 | // Calculate the mean material budget between start and |
1760 | // end point of this prolongation step |
83dea92e |
1761 | if(AliTracker::MeanMaterialBudget(xyz0, xyz1, param)<=0.) return 0; |
bccda319 |
1762 | |
41702fec |
1763 | // Propagate the track to the X-position after the next step |
9c87a076 |
1764 | if (!t.PropagateTo(x, param[1], param[0]*param[4])) return 0; |
bccda319 |
1765 | |
41702fec |
1766 | // Rotate the track if necessary |
1767 | AdjustSector(&t); |
bccda319 |
1768 | |
41702fec |
1769 | // New track X-position |
1770 | xpos = t.GetX(); |
bccda319 |
1771 | |
41702fec |
1772 | } |
bccda319 |
1773 | |
41702fec |
1774 | return 1; |
bccda319 |
1775 | |
1776 | } |
1777 | |
eb38ed55 |
1778 | |
1779 | //_____________________________________________________________________________ |
1780 | Int_t AliTRDtrackerV1::ReadClusters(TClonesArray* &array, TTree *clusterTree) const |
1781 | { |
41702fec |
1782 | // |
1783 | // Reads AliTRDclusters from the file. |
1784 | // The names of the cluster tree and branches |
1785 | // should match the ones used in AliTRDclusterizer::WriteClusters() |
1786 | // |
1787 | |
1788 | Int_t nsize = Int_t(clusterTree->GetTotBytes() / (sizeof(AliTRDcluster))); |
1789 | TObjArray *clusterArray = new TObjArray(nsize+1000); |
1790 | |
1791 | TBranch *branch = clusterTree->GetBranch("TRDcluster"); |
1792 | if (!branch) { |
1793 | AliError("Can't get the branch !"); |
1794 | return 1; |
1795 | } |
1796 | branch->SetAddress(&clusterArray); |
1797 | |
1798 | if(!fClusters){ |
8ae98148 |
1799 | Float_t nclusters = fReconstructor->GetRecoParam()->GetNClusters(); |
1800 | if(fReconstructor->IsHLT()) nclusters /= AliTRDgeometry::kNsector; |
1801 | array = new TClonesArray("AliTRDcluster", Int_t(nclusters)); |
41702fec |
1802 | array->SetOwner(kTRUE); |
1803 | } |
1804 | |
1805 | // Loop through all entries in the tree |
1806 | Int_t nEntries = (Int_t) clusterTree->GetEntries(); |
1807 | Int_t nbytes = 0; |
1808 | Int_t ncl = 0; |
1809 | AliTRDcluster *c = 0x0; |
1810 | for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) { |
1811 | // Import the tree |
1812 | nbytes += clusterTree->GetEvent(iEntry); |
1813 | |
1814 | // Get the number of points in the detector |
1815 | Int_t nCluster = clusterArray->GetEntriesFast(); |
1816 | for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) { |
1817 | if(!(c = (AliTRDcluster *) clusterArray->UncheckedAt(iCluster))) continue; |
41702fec |
1818 | new((*fClusters)[ncl++]) AliTRDcluster(*c); |
1819 | delete (clusterArray->RemoveAt(iCluster)); |
1820 | } |
1821 | |
1822 | } |
1823 | delete clusterArray; |
1824 | |
1825 | return 0; |
eb38ed55 |
1826 | } |
1827 | |
1828 | //_____________________________________________________________________________ |
1829 | Int_t AliTRDtrackerV1::LoadClusters(TTree *cTree) |
1830 | { |
41702fec |
1831 | // |
66f6bfd9 |
1832 | // Fills clusters into TRD tracking sectors |
41702fec |
1833 | // |
41702fec |
1834 | |
48f8adf3 |
1835 | if(!fReconstructor->IsWritingClusters()){ |
1836 | fClusters = AliTRDReconstructor::GetClusters(); |
1837 | } else { |
66f6bfd9 |
1838 | if (ReadClusters(fClusters, cTree)) { |
1839 | AliError("Problem with reading the clusters !"); |
1840 | return 1; |
1841 | } |
1842 | } |
1843 | SetClustersOwner(); |
1844 | |
48f8adf3 |
1845 | if(!fClusters || !fClusters->GetEntriesFast()){ |
66f6bfd9 |
1846 | AliInfo("No TRD clusters"); |
41702fec |
1847 | return 1; |
1848 | } |
66f6bfd9 |
1849 | |
1850 | //Int_t nin = |
1851 | BuildTrackingContainers(); |
1852 | |
1853 | //Int_t ncl = fClusters->GetEntriesFast(); |
1854 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); |
1855 | |
1856 | return 0; |
1857 | } |
1858 | |
1859 | //_____________________________________________________________________________ |
1860 | Int_t AliTRDtrackerV1::LoadClusters(TClonesArray *clusters) |
1861 | { |
1862 | // |
1863 | // Fills clusters into TRD tracking sectors |
1864 | // Function for use in the HLT |
1865 | |
1866 | if(!clusters || !clusters->GetEntriesFast()){ |
1867 | AliInfo("No TRD clusters"); |
41702fec |
1868 | return 1; |
1869 | } |
1870 | |
66f6bfd9 |
1871 | fClusters = clusters; |
1872 | SetClustersOwner(); |
1873 | |
1874 | //Int_t nin = |
1875 | BuildTrackingContainers(); |
1876 | |
1877 | //Int_t ncl = fClusters->GetEntriesFast(); |
1878 | //AliInfo(Form("Clusters %d [%6.2f %% in the active volume]", ncl, 100.*float(nin)/ncl)); |
1879 | |
1880 | return 0; |
1881 | } |
1882 | |
1883 | |
1884 | //____________________________________________________________________ |
1885 | Int_t AliTRDtrackerV1::BuildTrackingContainers() |
1886 | { |
1887 | // Building tracking containers for clusters |
1888 | |
1889 | Int_t nin =0, icl = fClusters->GetEntriesFast(); |
41702fec |
1890 | while (icl--) { |
1891 | AliTRDcluster *c = (AliTRDcluster *) fClusters->UncheckedAt(icl); |
1892 | if(c->IsInChamber()) nin++; |
1893 | Int_t detector = c->GetDetector(); |
1894 | Int_t sector = fGeom->GetSector(detector); |
053767a4 |
1895 | Int_t stack = fGeom->GetStack(detector); |
1896 | Int_t layer = fGeom->GetLayer(detector); |
41702fec |
1897 | |
053767a4 |
1898 | fTrSec[sector].GetChamber(stack, layer, kTRUE)->InsertCluster(c, icl); |
41702fec |
1899 | } |
b0a48c4d |
1900 | |
1901 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
053767a4 |
1902 | for(int isector =0; isector<AliTRDgeometry::kNsector; isector++){ |
41702fec |
1903 | if(!fTrSec[isector].GetNChambers()) continue; |
b0a48c4d |
1904 | fTrSec[isector].Init(fReconstructor, cal); |
41702fec |
1905 | } |
66f6bfd9 |
1906 | |
1907 | return nin; |
eb38ed55 |
1908 | } |
1909 | |
1910 | |
66f6bfd9 |
1911 | |
0906e73e |
1912 | //____________________________________________________________________ |
172b6f82 |
1913 | void AliTRDtrackerV1::UnloadClusters() |
0906e73e |
1914 | { |
d4cf71ca |
1915 | // |
1916 | // Clears the arrays of clusters and tracks. Resets sectors and timebins |
1917 | // If option "force" is also set the containers are also deleted. This is useful |
1918 | // in case of HLT |
1919 | |
1920 | if(fTracks){ |
1921 | fTracks->Delete(); |
172b6f82 |
1922 | if(HasRemoveContainers()){delete fTracks; fTracks = 0x0;} |
d4cf71ca |
1923 | } |
1924 | if(fTracklets){ |
1925 | fTracklets->Delete(); |
172b6f82 |
1926 | if(HasRemoveContainers()){delete fTracklets; fTracklets = 0x0;} |
d4cf71ca |
1927 | } |
48f8adf3 |
1928 | if(fClusters){ |
1929 | if(IsClustersOwner()) fClusters->Delete(); |
1930 | |
1931 | // save clusters array in the reconstructor for further use. |
1932 | if(!fReconstructor->IsWritingClusters()){ |
1933 | AliTRDReconstructor::SetClusters(fClusters); |
1934 | SetClustersOwner(kFALSE); |
1935 | } else AliTRDReconstructor::SetClusters(0x0); |
1936 | } |
0906e73e |
1937 | |
053767a4 |
1938 | for (int i = 0; i < AliTRDgeometry::kNsector; i++) fTrSec[i].Clear(); |
0906e73e |
1939 | |
41702fec |
1940 | // Increment the Event Number |
1941 | AliTRDtrackerDebug::SetEventNumber(AliTRDtrackerDebug::GetEventNumber() + 1); |
eb38ed55 |
1942 | } |
0906e73e |
1943 | |
fac58f00 |
1944 | // //____________________________________________________________________ |
1945 | // void AliTRDtrackerV1::UseClusters(const AliKalmanTrack *t, Int_t) const |
1946 | // { |
1947 | // const AliTRDtrackV1 *track = dynamic_cast<const AliTRDtrackV1*>(t); |
1948 | // if(!track) return; |
1949 | // |
1950 | // AliTRDseedV1 *tracklet = 0x0; |
1951 | // for(Int_t ily=AliTRDgeometry::kNlayer; ily--;){ |
1952 | // if(!(tracklet = track->GetTracklet(ily))) continue; |
1953 | // AliTRDcluster *c = 0x0; |
8d2bec9e |
1954 | // for(Int_t ic=AliTRDseed::kNclusters; ic--;){ |
fac58f00 |
1955 | // if(!(c=tracklet->GetClusters(ic))) continue; |
1956 | // c->Use(); |
1957 | // } |
1958 | // } |
1959 | // } |
1960 | // |
b1957d3c |
1961 | |
eb38ed55 |
1962 | //_____________________________________________________________________________ |
1963 | Bool_t AliTRDtrackerV1::AdjustSector(AliTRDtrackV1 *track) |
1964 | { |
41702fec |
1965 | // |
1966 | // Rotates the track when necessary |
1967 | // |
1968 | |
1969 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
1970 | Double_t y = track->GetY(); |
1971 | Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha); |
3cfaffa4 |
1972 | |
41702fec |
1973 | if (y > ymax) { |
1974 | if (!track->Rotate( alpha)) { |
1975 | return kFALSE; |
1976 | } |
1977 | } |
1978 | else if (y < -ymax) { |
1979 | if (!track->Rotate(-alpha)) { |
1980 | return kFALSE; |
1981 | } |
1982 | } |
1983 | |
1984 | return kTRUE; |
0906e73e |
1985 | |
1986 | } |
1987 | |
eb38ed55 |
1988 | |
0906e73e |
1989 | //____________________________________________________________________ |
1990 | AliTRDseedV1* AliTRDtrackerV1::GetTracklet(AliTRDtrackV1 *track, Int_t p, Int_t &idx) |
1991 | { |
41702fec |
1992 | // Find tracklet for TRD track <track> |
1993 | // Parameters |
1994 | // - track |
1995 | // - sector |
1996 | // - plane |
1997 | // - index |
1998 | // Output |
1999 | // tracklet |
2000 | // index |
2001 | // Detailed description |
2002 | // |
2003 | idx = track->GetTrackletIndex(p); |
2004 | AliTRDseedV1 *tracklet = (idx==0xffff) ? 0x0 : (AliTRDseedV1*)fTracklets->UncheckedAt(idx); |
2005 | |
2006 | return tracklet; |
0906e73e |
2007 | } |
2008 | |
2009 | //____________________________________________________________________ |
3b57a3f7 |
2010 | AliTRDseedV1* AliTRDtrackerV1::SetTracklet(AliTRDseedV1 *tracklet) |
0906e73e |
2011 | { |
41702fec |
2012 | // Add this tracklet to the list of tracklets stored in the tracker |
2013 | // |
2014 | // Parameters |
2015 | // - tracklet : pointer to the tracklet to be added to the list |
2016 | // |
2017 | // Output |
2018 | // - the index of the new tracklet in the tracker tracklets list |
2019 | // |
2020 | // Detailed description |
2021 | // Build the tracklets list if it is not yet created (late initialization) |
2022 | // and adds the new tracklet to the list. |
2023 | // |
2024 | if(!fTracklets){ |
053767a4 |
2025 | fTracklets = new TClonesArray("AliTRDseedV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
41702fec |
2026 | fTracklets->SetOwner(kTRUE); |
2027 | } |
2028 | Int_t nentries = fTracklets->GetEntriesFast(); |
2029 | return new ((*fTracklets)[nentries]) AliTRDseedV1(*tracklet); |
972ef65e |
2030 | } |
2031 | |
d20df6fc |
2032 | //____________________________________________________________________ |
2033 | AliTRDtrackV1* AliTRDtrackerV1::SetTrack(AliTRDtrackV1 *track) |
2034 | { |
2035 | // Add this track to the list of tracks stored in the tracker |
2036 | // |
2037 | // Parameters |
2038 | // - track : pointer to the track to be added to the list |
2039 | // |
2040 | // Output |
2041 | // - the pointer added |
2042 | // |
2043 | // Detailed description |
2044 | // Build the tracks list if it is not yet created (late initialization) |
2045 | // and adds the new track to the list. |
2046 | // |
2047 | if(!fTracks){ |
053767a4 |
2048 | fTracks = new TClonesArray("AliTRDtrackV1", AliTRDgeometry::Nsector()*kMaxTracksStack); |
d20df6fc |
2049 | fTracks->SetOwner(kTRUE); |
2050 | } |
2051 | Int_t nentries = fTracks->GetEntriesFast(); |
2052 | return new ((*fTracks)[nentries]) AliTRDtrackV1(*track); |
2053 | } |
2054 | |
2055 | |
0906e73e |
2056 | |
e4f2f73d |
2057 | //____________________________________________________________________ |
eb38ed55 |
2058 | Int_t AliTRDtrackerV1::Clusters2TracksSM(Int_t sector, AliESDEvent *esd) |
e4f2f73d |
2059 | { |
41702fec |
2060 | // |
2061 | // Steer tracking for one SM. |
2062 | // |
2063 | // Parameters : |
2064 | // sector : Array of (SM) propagation layers containing clusters |
2065 | // esd : The current ESD event. On output it contains the also |
2066 | // the ESD (TRD) tracks found in this SM. |
2067 | // |
2068 | // Output : |
2069 | // Number of tracks found in this TRD supermodule. |
2070 | // |
2071 | // Detailed description |
2072 | // |
2073 | // 1. Unpack AliTRDpropagationLayers objects for each stack. |
2074 | // 2. Launch stack tracking. |
2075 | // See AliTRDtrackerV1::Clusters2TracksStack() for details. |
2076 | // 3. Pack results in the ESD event. |
2077 | // |
2078 | |
2079 | // allocate space for esd tracks in this SM |
2080 | TClonesArray esdTrackList("AliESDtrack", 2*kMaxTracksStack); |
2081 | esdTrackList.SetOwner(); |
2082 | |
2083 | Int_t nTracks = 0; |
2084 | Int_t nChambers = 0; |
2085 | AliTRDtrackingChamber **stack = 0x0, *chamber = 0x0; |
053767a4 |
2086 | for(int istack = 0; istack<AliTRDgeometry::kNstack; istack++){ |
41702fec |
2087 | if(!(stack = fTrSec[sector].GetStack(istack))) continue; |
2088 | nChambers = 0; |
053767a4 |
2089 | for(int ilayer=0; ilayer<AliTRDgeometry::kNlayer; ilayer++){ |
2090 | if(!(chamber = stack[ilayer])) continue; |
3a039a31 |
2091 | if(chamber->GetNClusters() < fgNTimeBins * fReconstructor->GetRecoParam() ->GetFindableClusters()) continue; |
41702fec |
2092 | nChambers++; |
053767a4 |
2093 | //AliInfo(Form("sector %d stack %d layer %d clusters %d", sector, istack, ilayer, chamber->GetNClusters())); |
41702fec |
2094 | } |
2095 | if(nChambers < 4) continue; |
2096 | //AliInfo(Form("Doing stack %d", istack)); |
2097 | nTracks += Clusters2TracksStack(stack, &esdTrackList); |
2098 | } |
2099 | //AliInfo(Form("Found %d tracks in SM %d [%d]\n", nTracks, sector, esd->GetNumberOfTracks())); |
2100 | |
2101 | for(int itrack=0; itrack<nTracks; itrack++) |
2102 | esd->AddTrack((AliESDtrack*)esdTrackList[itrack]); |
2103 | |
2104 | // Reset Track and Candidate Number |
2105 | AliTRDtrackerDebug::SetCandidateNumber(0); |
2106 | AliTRDtrackerDebug::SetTrackNumber(0); |
2107 | return nTracks; |
e4f2f73d |
2108 | } |
2109 | |
2110 | //____________________________________________________________________ |
eb38ed55 |
2111 | Int_t AliTRDtrackerV1::Clusters2TracksStack(AliTRDtrackingChamber **stack, TClonesArray *esdTrackList) |
e4f2f73d |
2112 | { |
41702fec |
2113 | // |
2114 | // Make tracks in one TRD stack. |
2115 | // |
2116 | // Parameters : |
2117 | // layer : Array of stack propagation layers containing clusters |
2118 | // esdTrackList : Array of ESD tracks found by the stand alone tracker. |
2119 | // On exit the tracks found in this stack are appended. |
2120 | // |
2121 | // Output : |
2122 | // Number of tracks found in this stack. |
2123 | // |
2124 | // Detailed description |
2125 | // |
2126 | // 1. Find the 3 most useful seeding chambers. See BuildSeedingConfigs() for details. |
2127 | // 2. Steer AliTRDtrackerV1::MakeSeeds() for 3 seeding layer configurations. |
2128 | // See AliTRDtrackerV1::MakeSeeds() for more details. |
2129 | // 3. Arrange track candidates in decreasing order of their quality |
2130 | // 4. Classify tracks in 5 categories according to: |
2131 | // a) number of layers crossed |
2132 | // b) track quality |
2133 | // 5. Sign clusters by tracks in decreasing order of track quality |
2134 | // 6. Build AliTRDtrack out of seeding tracklets |
2135 | // 7. Cook MC label |
2136 | // 8. Build ESD track and register it to the output list |
2137 | // |
2138 | |
b0a48c4d |
2139 | const AliTRDCalDet *cal = AliTRDcalibDB::Instance()->GetT0Det(); |
41702fec |
2140 | AliTRDtrackingChamber *chamber = 0x0; |
fac58f00 |
2141 | AliTRDtrackingChamber **ci = 0x0; |
41702fec |
2142 | AliTRDseedV1 sseed[kMaxTracksStack*6]; // to be initialized |
2143 | Int_t pars[4]; // MakeSeeds parameters |
2144 | |
2145 | //Double_t alpha = AliTRDgeometry::GetAlpha(); |
2146 | //Double_t shift = .5 * alpha; |
2147 | Int_t configs[kNConfigs]; |
2148 | |
fac58f00 |
2149 | // Purge used clusters from the containers |
2150 | ci = &stack[0]; |
2151 | for(Int_t ic = kNPlanes; ic--; ci++){ |
2152 | if(!(*ci)) continue; |
2153 | (*ci)->Update(); |
2154 | } |
2155 | |
41702fec |
2156 | // Build initial seeding configurations |
2157 | Double_t quality = BuildSeedingConfigs(stack, configs); |
eb2b4f91 |
2158 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){ |
41702fec |
2159 | AliInfo(Form("Plane config %d %d %d Quality %f" |
2160 | , configs[0], configs[1], configs[2], quality)); |
2161 | } |
d931f2aa |
2162 | |
41702fec |
2163 | |
2164 | // Initialize contors |
2165 | Int_t ntracks, // number of TRD track candidates |
2166 | ntracks1, // number of registered TRD tracks/iter |
2167 | ntracks2 = 0; // number of all registered TRD tracks in stack |
2168 | fSieveSeeding = 0; |
d931f2aa |
2169 | |
2170 | // Get stack index |
fac58f00 |
2171 | Int_t ic = 0; ci = &stack[0]; |
2172 | while(ic<kNPlanes && !(*ci)){ic++; ci++;} |
2173 | if(!(*ci)) return ntracks2; |
2174 | Int_t istack = fGeom->GetStack((*ci)->GetDetector()); |
d931f2aa |
2175 | |
41702fec |
2176 | do{ |
2177 | // Loop over seeding configurations |
2178 | ntracks = 0; ntracks1 = 0; |
2179 | for (Int_t iconf = 0; iconf<3; iconf++) { |
2180 | pars[0] = configs[iconf]; |
2181 | pars[1] = ntracks; |
d931f2aa |
2182 | pars[2] = istack; |
41702fec |
2183 | ntracks = MakeSeeds(stack, &sseed[6*ntracks], pars); |
6e39bde4 |
2184 | //AliInfo(Form("Number of Tracks after iteration step %d: %d\n", iconf, ntracks)); |
41702fec |
2185 | if(ntracks == kMaxTracksStack) break; |
2186 | } |
6e39bde4 |
2187 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1) AliInfo(Form("Candidate TRD tracks %d in iteration %d.", ntracks, fSieveSeeding)); |
41702fec |
2188 | |
2189 | if(!ntracks) break; |
2190 | |
2191 | // Sort the seeds according to their quality |
2192 | Int_t sort[kMaxTracksStack]; |
2193 | TMath::Sort(ntracks, fTrackQuality, sort, kTRUE); |
2194 | |
2195 | // Initialize number of tracks so far and logic switches |
2196 | Int_t ntracks0 = esdTrackList->GetEntriesFast(); |
2197 | Bool_t signedTrack[kMaxTracksStack]; |
2198 | Bool_t fakeTrack[kMaxTracksStack]; |
2199 | for (Int_t i=0; i<ntracks; i++){ |
2200 | signedTrack[i] = kFALSE; |
2201 | fakeTrack[i] = kFALSE; |
2202 | } |
2203 | //AliInfo("Selecting track candidates ..."); |
2204 | |
2205 | // Sieve clusters in decreasing order of track quality |
2206 | Double_t trackParams[7]; |
2207 | // AliTRDseedV1 *lseed = 0x0; |
2208 | Int_t jSieve = 0, candidates; |
2209 | do{ |
2210 | //AliInfo(Form("\t\tITER = %i ", jSieve)); |
2211 | |
2212 | // Check track candidates |
2213 | candidates = 0; |
2214 | for (Int_t itrack = 0; itrack < ntracks; itrack++) { |
804bb02e |
2215 | Int_t trackIndex = sort[itrack]; |
2216 | if (signedTrack[trackIndex] || fakeTrack[trackIndex]) continue; |
41702fec |
2217 | |
2218 | |
804bb02e |
2219 | // Calculate track parameters from tracklets seeds |
804bb02e |
2220 | Int_t ncl = 0; |
2221 | Int_t nused = 0; |
2222 | Int_t nlayers = 0; |
2223 | Int_t findable = 0; |
2224 | for (Int_t jLayer = 0; jLayer < kNPlanes; jLayer++) { |
2225 | Int_t jseed = kNPlanes*trackIndex+jLayer; |
2226 | if(!sseed[jseed].IsOK()) continue; |
f29f13a6 |
2227 | if (TMath::Abs(sseed[jseed].GetYref(0) / sseed[jseed].GetX0()) < 0.158) findable++; |
eede7907 |
2228 | // TODO here we get a sig fault which should never happen ! |
804bb02e |
2229 | sseed[jseed].UpdateUsed(); |
2230 | ncl += sseed[jseed].GetN2(); |
2231 | nused += sseed[jseed].GetNUsed(); |
2232 | nlayers++; |
804bb02e |
2233 | } |
2234 | |
f29f13a6 |
2235 | // Filter duplicated tracks |
2236 | if (nused > 30){ |
2237 | //printf("Skip %d nused %d\n", trackIndex, nused); |
2238 | fakeTrack[trackIndex] = kTRUE; |
2239 | continue; |
2240 | } |
2241 | if (Float_t(nused)/ncl >= .25){ |
2242 | //printf("Skip %d nused/ncl >= .25\n", trackIndex); |
2243 | fakeTrack[trackIndex] = kTRUE; |
2244 | continue; |
2245 | } |
41702fec |
2246 | |
f29f13a6 |
2247 | // Classify tracks |
2248 | Bool_t skip = kFALSE; |
2249 | switch(jSieve){ |
2250 | case 0: |
2251 | if(nlayers < 6) {skip = kTRUE; break;} |
2252 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
2253 | break; |
2254 | |
2255 | case 1: |
2256 | if(nlayers < findable){skip = kTRUE; break;} |
2257 | if(TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -4.){skip = kTRUE; break;} |
2258 | break; |
2259 | |
2260 | case 2: |
2261 | if ((nlayers == findable) || (nlayers == 6)) { skip = kTRUE; break;} |
2262 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -6.0){skip = kTRUE; break;} |
2263 | break; |
2264 | |
2265 | case 3: |
2266 | if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) < -5.){skip = kTRUE; break;} |
2267 | break; |
2268 | |
2269 | case 4: |
2270 | if (nlayers == 3){skip = kTRUE; break;} |
2271 | //if (TMath::Log(1.E-9+fTrackQuality[trackIndex]) - nused/(nlayers-3.0) < -15.0){skip = kTRUE; break;} |
2272 | break; |
2273 | } |
2274 | if(skip){ |
2275 | candidates++; |
2276 | //printf("REJECTED : %d [%d] nlayers %d trackQuality = %e nused %d\n", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused); |
2277 | continue; |
2278 | } |
2279 | signedTrack[trackIndex] = kTRUE; |
2280 | |
2281 | // Build track parameters |
2282 | AliTRDseedV1 *lseed =&sseed[trackIndex*6]; |
2283 | /* Int_t idx = 0; |
2284 | while(idx<3 && !lseed->IsOK()) { |
2285 | idx++; |
2286 | lseed++; |
2287 | }*/ |
2288 | Double_t x = lseed->GetX0();// - 3.5; |
2289 | trackParams[0] = x; //NEW AB |
2290 | trackParams[1] = lseed->GetYref(0); // lseed->GetYat(x); |
2291 | trackParams[2] = lseed->GetZref(0); // lseed->GetZat(x); |
2292 | trackParams[3] = TMath::Sin(TMath::ATan(lseed->GetYref(1))); |
2293 | trackParams[4] = lseed->GetZref(1) / TMath::Sqrt(1. + lseed->GetYref(1) * lseed->GetYref(1)); |
2294 | trackParams[5] = lseed->GetC(); |
2295 | Int_t ich = 0; while(!(chamber = stack[ich])) ich++; |
2296 | trackParams[6] = fGeom->GetSector(chamber->GetDetector());/* *alpha+shift; // Supermodule*/ |
2297 | |
2298 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 1){ |
eb2b4f91 |
2299 | //AliInfo(Form("Track %d [%d] nlayers %d trackQuality = %e nused %d, yref = %3.3f", itrack, trackIndex, nlayers, fTrackQuality[trackIndex], nused, trackParams[1])); |
f29f13a6 |
2300 | |
f29f13a6 |
2301 | AliTRDseedV1 *dseed[6]; |
b82b4de1 |
2302 | for(Int_t iseed = AliTRDgeometry::kNlayer; iseed--;) dseed[iseed] = new AliTRDseedV1(lseed[iseed]); |
f29f13a6 |
2303 | |
2304 | //Int_t eventNrInFile = esd->GetEventNumberInFile(); |
f29f13a6 |
2305 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2306 | Int_t trackNumber = AliTRDtrackerDebug::GetTrackNumber(); |
2307 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2308 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
2309 | cstreamer << "Clusters2TracksStack" |
2310 | << "EventNumber=" << eventNumber |
2311 | << "TrackNumber=" << trackNumber |
2312 | << "CandidateNumber=" << candidateNumber |
2313 | << "Iter=" << fSieveSeeding |
2314 | << "Like=" << fTrackQuality[trackIndex] |
2315 | << "S0.=" << dseed[0] |
2316 | << "S1.=" << dseed[1] |
2317 | << "S2.=" << dseed[2] |
2318 | << "S3.=" << dseed[3] |
2319 | << "S4.=" << dseed[4] |
2320 | << "S5.=" << dseed[5] |
2321 | << "p0=" << trackParams[0] |
2322 | << "p1=" << trackParams[1] |
2323 | << "p2=" << trackParams[2] |
2324 | << "p3=" << trackParams[3] |
2325 | << "p4=" << trackParams[4] |
2326 | << "p5=" << trackParams[5] |
2327 | << "p6=" << trackParams[6] |
f29f13a6 |
2328 | << "Ncl=" << ncl |
2329 | << "NLayers=" << nlayers |
2330 | << "Findable=" << findable |
2331 | << "NUsed=" << nused |
2332 | << "\n"; |
2333 | } |
d877f55f |
2334 | |
f29f13a6 |
2335 | AliTRDtrackV1 *track = MakeTrack(&sseed[trackIndex*kNPlanes], trackParams); |
2336 | if(!track){ |
2337 | AliWarning("Fail to build a TRD Track."); |
2338 | continue; |
d877f55f |
2339 | } |
41702fec |
2340 | |
f29f13a6 |
2341 | //AliInfo("End of MakeTrack()"); |
2342 | AliESDtrack *esdTrack = new ((*esdTrackList)[ntracks0++]) AliESDtrack(); |
2343 | esdTrack->UpdateTrackParams(track, AliESDtrack::kTRDout); |
2344 | esdTrack->SetLabel(track->GetLabel()); |
2345 | track->UpdateESDtrack(esdTrack); |
2346 | // write ESD-friends if neccessary |
2347 | if (fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 0){ |
2348 | AliTRDtrackV1 *calibTrack = new AliTRDtrackV1(*track); |
2349 | calibTrack->SetOwner(); |
2350 | esdTrack->AddCalibObject(calibTrack); |
2351 | } |
2352 | ntracks1++; |
2353 | AliTRDtrackerDebug::SetTrackNumber(AliTRDtrackerDebug::GetTrackNumber() + 1); |
41702fec |
2354 | } |
2355 | |
2356 | jSieve++; |
2357 | } while(jSieve<5 && candidates); // end track candidates sieve |
2358 | if(!ntracks1) break; |
2359 | |
2360 | // increment counters |
2361 | ntracks2 += ntracks1; |
4302c900 |
2362 | |
2363 | if(fReconstructor->IsHLT()) break; |
41702fec |
2364 | fSieveSeeding++; |
2365 | |
2366 | // Rebuild plane configurations and indices taking only unused clusters into account |
2367 | quality = BuildSeedingConfigs(stack, configs); |
3a039a31 |
2368 | if(quality < 1.E-7) break; //fReconstructor->GetRecoParam() ->GetPlaneQualityThreshold()) break; |
41702fec |
2369 | |
2370 | for(Int_t ip = 0; ip < kNPlanes; ip++){ |
2371 | if(!(chamber = stack[ip])) continue; |
b0a48c4d |
2372 | chamber->Build(fGeom, cal);//Indices(fSieveSeeding); |
41702fec |
2373 | } |
2374 | |
eb2b4f91 |
2375 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 10){ |
41702fec |
2376 | AliInfo(Form("Sieve level %d Plane config %d %d %d Quality %f", fSieveSeeding, configs[0], configs[1], configs[2], quality)); |
2377 | } |
2378 | } while(fSieveSeeding<10); // end stack clusters sieve |
2379 | |
2380 | |
2381 | |
2382 | //AliInfo(Form("Registered TRD tracks %d in stack %d.", ntracks2, pars[1])); |
2383 | |
2384 | return ntracks2; |
e4f2f73d |
2385 | } |
2386 | |
2387 | //___________________________________________________________________ |
eb38ed55 |
2388 | Double_t AliTRDtrackerV1::BuildSeedingConfigs(AliTRDtrackingChamber **stack, Int_t *configs) |
e4f2f73d |
2389 | { |
41702fec |
2390 | // |
2391 | // Assign probabilities to chambers according to their |
2392 | // capability of producing seeds. |
2393 | // |
2394 | // Parameters : |
2395 | // |
2396 | // layers : Array of stack propagation layers for all 6 chambers in one stack |
2397 | // configs : On exit array of configuration indexes (see GetSeedingConfig() |
2398 | // for details) in the decreasing order of their seeding probabilities. |
2399 | // |
2400 | // Output : |
2401 | // |
2402 | // Return top configuration quality |
2403 | // |
2404 | // Detailed description: |
2405 | // |
2406 | // To each chamber seeding configuration (see GetSeedingConfig() for |
2407 | // the list of all configurations) one defines 2 quality factors: |
2408 | // - an apriori topological quality (see GetSeedingConfig() for details) and |
2409 | // - a data quality based on the uniformity of the distribution of |
2410 | // clusters over the x range (time bins population). See CookChamberQA() for details. |
2411 | // The overall chamber quality is given by the product of this 2 contributions. |
2412 | // |
2413 | |
eb2b4f91 |
2414 | Double_t chamberQ[kNPlanes];memset(chamberQ, 0, kNPlanes*sizeof(Double_t)); |
41702fec |
2415 | AliTRDtrackingChamber *chamber = 0x0; |
2416 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2417 | if(!(chamber = stack[iplane])) continue; |
2418 | chamberQ[iplane] = (chamber = stack[iplane]) ? chamber->GetQuality() : 0.; |
2419 | } |
2420 | |
eb2b4f91 |
2421 | Double_t tconfig[kNConfigs];memset(tconfig, 0, kNConfigs*sizeof(Double_t)); |
2422 | Int_t planes[] = {0, 0, 0, 0}; |
41702fec |
2423 | for(int iconf=0; iconf<kNConfigs; iconf++){ |
2424 | GetSeedingConfig(iconf, planes); |
2425 | tconfig[iconf] = fgTopologicQA[iconf]; |
2426 | for(int iplane=0; iplane<4; iplane++) tconfig[iconf] *= chamberQ[planes[iplane]]; |
2427 | } |
2428 | |
2429 | TMath::Sort((Int_t)kNConfigs, tconfig, configs, kTRUE); |
2430 | // AliInfo(Form("q[%d] = %f", configs[0], tconfig[configs[0]])); |
2431 | // AliInfo(Form("q[%d] = %f", configs[1], tconfig[configs[1]])); |
2432 | // AliInfo(Form("q[%d] = %f", configs[2], tconfig[configs[2]])); |
2433 | |
2434 | return tconfig[configs[0]]; |
e4f2f73d |
2435 | } |
2436 | |
2437 | //____________________________________________________________________ |
eb38ed55 |
2438 | Int_t AliTRDtrackerV1::MakeSeeds(AliTRDtrackingChamber **stack, AliTRDseedV1 *sseed, Int_t *ipar) |
e4f2f73d |
2439 | { |
afa21247 |
2440 | // |
2a3191bb |
2441 | // Seed tracklets and build candidate TRD tracks. The procedure is used during barrel tracking to account for tracks which are |
2442 | // either missed by TPC prolongation or conversions inside the TRD volume. |
2443 | // For stand alone tracking the procedure is used to estimate all tracks measured by TRD. |
afa21247 |
2444 | // |
2445 | // Parameters : |
2446 | // layers : Array of stack propagation layers containing clusters |
2447 | // sseed : Array of empty tracklet seeds. On exit they are filled. |
2448 | // ipar : Control parameters: |
2449 | // ipar[0] -> seeding chambers configuration |
2450 | // ipar[1] -> stack index |
2451 | // ipar[2] -> number of track candidates found so far |
2452 | // |
2453 | // Output : |
2454 | // Number of tracks candidates found. |
2455 | // |
2456 | // The following steps are performed: |
2457 | // 1. Build seeding layers by collapsing all time bins from each of the four seeding chambers along the |
2458 | // radial coordinate. See AliTRDtrackingChamber::GetSeedingLayer() for details. The chambers selection for seeding |
2459 | // is described in AliTRDtrackerV1::Clusters2TracksStack(). |
2460 | // 2. Using the seeding clusters from the seeding layer (step 1) build combinatorics using the following algorithm: |
2461 | // - for each seeding cluster in the lower seeding layer find |
2462 | // - all seeding clusters in the upper seeding layer inside a road defined by a given phi angle. The angle |
2463 | // is calculated on the minimum pt of tracks from vertex accesible to the stand alone tracker. |
2464 | // - for each pair of two extreme seeding clusters select middle upper cluster using roads defined externally by the |
2465 | // reco params |
2466 | // - select last seeding cluster as the nearest to the linear approximation of the track described by the first three |
2467 | // seeding clusters. |
2468 | // The implementation of road calculation and cluster selection can be found in the functions AliTRDchamberTimeBin::BuildCond() |
2469 | // and AliTRDchamberTimeBin::GetClusters(). |
2470 | // 3. Helix fit of the seeding clusters set. (see AliTRDtrackerFitter::FitRieman(AliTRDcluster**)). No tilt correction is |
2471 | // performed at this level |
2472 | // 4. Initialize seeding tracklets in the seeding chambers. |
2473 | // 5. *Filter 0* Chi2 cut on the Y and Z directions. The threshold is set externally by the reco params. |
2474 | // 6. Attach (true) clusters to seeding tracklets (see AliTRDseedV1::AttachClusters()) and fit tracklet (see |
2475 | // AliTRDseedV1::Fit()). The number of used clusters used by current seeds should not exceed ... (25). |
2476 | // 7. *Filter 1* Check if all 4 seeding tracklets are correctly constructed. |
2477 | // 8. Helix fit of the clusters from the seeding tracklets with tilt correction. Refit tracklets using the new |
2478 | // approximation of the track. |
2479 | // 9. *Filter 2* Calculate likelihood of the track. (See AliTRDtrackerV1::CookLikelihood()). The following quantities are |
2480 | // checked against the Riemann fit: |
2481 | // - position resolution in y |
2482 | // - angular resolution in the bending plane |
2483 | // - likelihood of the number of clusters attached to the tracklet |
2484 | // 10. Extrapolation of the helix fit to the other 2 chambers *non seeding* chambers: |
2485 | // - Initialization of extrapolation tracklets with the fit parameters |
2486 | // - Attach clusters to extrapolated tracklets |
2487 | // - Helix fit of tracklets |
2488 | // 11. Improve seeding tracklets quality by reassigning clusters based on the last parameters of the track |
2489 | // See AliTRDtrackerV1::ImproveSeedQuality() for details. |
2490 | // 12. Helix fit of all 6 seeding tracklets and chi2 calculation |
2491 | // 13. Hyperplane fit and track quality calculation. See AliTRDtrackerFitter::FitHyperplane() for details. |
2492 | // 14. Cooking labels for tracklets. Should be done only for MC |
2493 | // 15. Register seeds. |
2494 | // |
2495 | // Authors: |
2496 | // Marian Ivanov <M.Ivanov@gsi.de> |
2497 | // Alexandru Bercuci <A.Bercuci@gsi.de> |
2498 | // Markus Fasel <M.Fasel@gsi.de> |
41702fec |
2499 | |
2500 | AliTRDtrackingChamber *chamber = 0x0; |
be24510a |
2501 | AliTRDcluster *c[kNSeedPlanes] = {0x0, 0x0, 0x0, 0x0}; // initilize seeding clusters |
41702fec |
2502 | AliTRDseedV1 *cseed = &sseed[0]; // initialize tracklets for first track |
2503 | Int_t ncl, mcl; // working variable for looping over clusters |
2504 | Int_t index[AliTRDchamberTimeBin::kMaxClustersLayer], jndex[AliTRDchamberTimeBin::kMaxClustersLayer]; |
2505 | // chi2 storage |
2506 | // chi2[0] = tracklet chi2 on the Z direction |
2507 | // chi2[1] = tracklet chi2 on the R direction |
2508 | Double_t chi2[4]; |
2509 | |
afa21247 |
2510 | // this should be data member of AliTRDtrack TODO |
41702fec |
2511 | Double_t seedQuality[kMaxTracksStack]; |
2512 | |
2513 | // unpack control parameters |
2514 | Int_t config = ipar[0]; |
2515 | Int_t ntracks = ipar[1]; |
d931f2aa |
2516 | Int_t istack = ipar[2]; |
41702fec |
2517 | Int_t planes[kNSeedPlanes]; GetSeedingConfig(config, planes); |
afa21247 |
2518 | Int_t planesExt[kNPlanes-kNSeedPlanes]; GetExtrapolationConfig(config, planesExt); |
be24510a |
2519 | |
2520 | |
41702fec |
2521 | // Init chambers geometry |
41702fec |
2522 | Double_t hL[kNPlanes]; // Tilting angle |
2523 | Float_t padlength[kNPlanes]; // pad lenghts |
dd8059a8 |
2524 | Float_t padwidth[kNPlanes]; // pad widths |
41702fec |
2525 | AliTRDpadPlane *pp = 0x0; |
2526 | for(int iplane=0; iplane<kNPlanes; iplane++){ |
2527 | pp = fGeom->GetPadPlane(iplane, istack); |
bb79ccd5 |
2528 | hL[iplane] = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); |
41702fec |
2529 | padlength[iplane] = pp->GetLengthIPad(); |
dd8059a8 |
2530 | padwidth[iplane] = pp->GetWidthIPad(); |
41702fec |
2531 | } |
2532 | |
eb2b4f91 |
2533 | // Init anode wire position for chambers |
e165b64b |
2534 | Double_t x0[kNPlanes], // anode wire position |
eb2b4f91 |
2535 | driftLength = .5*AliTRDgeometry::AmThick() - AliTRDgeometry::DrThick(); // drift length |
2536 | TGeoHMatrix *matrix = 0x0; |
2537 | Double_t loc[] = {AliTRDgeometry::AnodePos(), 0., 0.}; |
2538 | Double_t glb[] = {0., 0., 0.}; |
2539 | AliTRDtrackingChamber **cIter = &stack[0]; |
a3743898 |
2540 | for(int iLayer=0; iLayer<kNPlanes; iLayer++,cIter++){ |
eb2b4f91 |
2541 | if(!(*cIter)) continue; |
e165b64b |
2542 | if(!(matrix = fGeom->GetClusterMatrix((*cIter)->GetDetector()))){ |
2543 | continue; |
2544 | x0[iLayer] = fgkX0[iLayer]; |
2545 | } |
eb2b4f91 |
2546 | matrix->LocalToMaster(loc, glb); |
2547 | x0[iLayer] = glb[0]; |
2548 | } |
2549 | |
6e39bde4 |
2550 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 2){ |
41702fec |
2551 | AliInfo(Form("Making seeds Stack[%d] Config[%d] Tracks[%d]...", istack, config, ntracks)); |
2552 | } |
2553 | |
d931f2aa |
2554 | // Build seeding layers |
d611c74f |
2555 | ResetSeedTB(); |
41702fec |
2556 | Int_t nlayers = 0; |
41702fec |
2557 | for(int isl=0; isl<kNSeedPlanes; isl++){ |
2558 | if(!(chamber = stack[planes[isl]])) continue; |
3a039a31 |
2559 | if(!chamber->GetSeedingLayer(fSeedTB[isl], fGeom, fReconstructor)) continue; |
41702fec |
2560 | nlayers++; |
41702fec |
2561 | } |
eb2b4f91 |
2562 | if(nlayers < kNSeedPlanes) return ntracks; |
41702fec |
2563 | |
2564 | |
2565 | // Start finding seeds |
2566 | Double_t cond0[4], cond1[4], cond2[4]; |
2567 | Int_t icl = 0; |
d611c74f |
2568 | while((c[3] = (*fSeedTB[3])[icl++])){ |
41702fec |
2569 | if(!c[3]) continue; |
d611c74f |
2570 | fSeedTB[0]->BuildCond(c[3], cond0, 0); |
2571 | fSeedTB[0]->GetClusters(cond0, index, ncl); |
41702fec |
2572 | //printf("Found c[3] candidates 0 %d\n", ncl); |
2573 | Int_t jcl = 0; |
2574 | while(jcl<ncl) { |
d611c74f |
2575 | c[0] = (*fSeedTB[0])[index[jcl++]]; |
41702fec |
2576 | if(!c[0]) continue; |
2577 | Double_t dx = c[3]->GetX() - c[0]->GetX(); |
afa21247 |
2578 | Double_t dzdx = (c[3]->GetZ() - c[0]->GetZ())/dx; |
2579 | Double_t dydx = (c[3]->GetY() - c[0]->GetY())/dx; |
2580 | fSeedTB[1]->BuildCond(c[0], cond1, 1, dzdx, dydx); |
d611c74f |
2581 | fSeedTB[1]->GetClusters(cond1, jndex, mcl); |
41702fec |
2582 | //printf("Found c[0] candidates 1 %d\n", mcl); |
2583 | |
2584 | Int_t kcl = 0; |
2585 | while(kcl<mcl) { |
d611c74f |
2586 | c[1] = (*fSeedTB[1])[jndex[kcl++]]; |
2587 | if(!c[1]) continue; |
afa21247 |
2588 | fSeedTB[2]->BuildCond(c[1], cond2, 2, dzdx, dydx); |
d611c74f |
2589 | c[2] = fSeedTB[2]->GetNearestCluster(cond2); |
2590 | //printf("Found c[1] candidate 2 %p\n", c[2]); |
2591 | if(!c[2]) continue; |
2592 | |
6e39bde4 |
2593 | //AliInfo("Seeding clusters found. Building seeds ..."); |
2594 | //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 |
2595 | |
804bb02e |
2596 | for (Int_t il = 0; il < kNPlanes; il++) cseed[il].Reset(); |
41702fec |
2597 | |
d611c74f |
2598 | FitRieman(c, chi2); |
2599 | |
d931f2aa |
2600 | AliTRDseedV1 *tseed = &cseed[0]; |
bb2db46c |
2601 | cIter = &stack[0]; |
2602 | for(int iLayer=0; iLayer<kNPlanes; iLayer++, tseed++, cIter++){ |
2603 | Int_t det = (*cIter) ? (*cIter)->GetDetector() : -1; |
eb2b4f91 |
2604 | tseed->SetDetector(det); |
43d6ad34 |
2605 | tseed->SetTilt(hL[iLayer]); |
2606 | tseed->SetPadLength(padlength[iLayer]); |
dd8059a8 |
2607 | tseed->SetPadWidth(padwidth[iLayer]); |
3a039a31 |
2608 | tseed->SetReconstructor(fReconstructor); |
eb2b4f91 |
2609 | tseed->SetX0(det<0 ? fR[iLayer]+driftLength : x0[iLayer]); |
d611c74f |
2610 | tseed->Init(GetRiemanFitter()); |
f29f13a6 |
2611 | tseed->SetStandAlone(kTRUE); |
d611c74f |
2612 | } |
2613 | |
2614 | Bool_t isFake = kFALSE; |
3a039a31 |
2615 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
d611c74f |
2616 | if (c[0]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2617 | if (c[1]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2618 | if (c[2]->GetLabel(0) != c[3]->GetLabel(0)) isFake = kTRUE; |
2619 | |
2620 | Double_t xpos[4]; |
2621 | for(Int_t l = 0; l < kNSeedPlanes; l++) xpos[l] = fSeedTB[l]->GetX(); |
2622 | Float_t yref[4]; |
2623 | for(int il=0; il<4; il++) yref[il] = cseed[planes[il]].GetYref(0); |
2624 | Int_t ll = c[3]->GetLabel(0); |
2625 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2626 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2627 | AliRieman *rim = GetRiemanFitter(); |
29f95561 |
2628 | TTreeSRedirector &cs0 = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f |
2629 | cs0 << "MakeSeeds0" |
2630 | <<"EventNumber=" << eventNumber |
2631 | <<"CandidateNumber=" << candidateNumber |
2632 | <<"isFake=" << isFake |
2633 | <<"config=" << config |
2634 | <<"label=" << ll |
2635 | <<"chi2z=" << chi2[0] |
2636 | <<"chi2y=" << chi2[1] |
2637 | <<"Y2exp=" << cond2[0] |
2638 | <<"Z2exp=" << cond2[1] |
2639 | <<"X0=" << xpos[0] //layer[sLayer]->GetX() |
2640 | <<"X1=" << xpos[1] //layer[sLayer + 1]->GetX() |
2641 | <<"X2=" << xpos[2] //layer[sLayer + 2]->GetX() |
2642 | <<"X3=" << xpos[3] //layer[sLayer + 3]->GetX() |
2643 | <<"yref0=" << yref[0] |
2644 | <<"yref1=" << yref[1] |
2645 | <<"yref2=" << yref[2] |
2646 | <<"yref3=" << yref[3] |
2647 | <<"c0.=" << c[0] |
2648 | <<"c1.=" << c[1] |
2649 | <<"c2.=" << c[2] |
2650 | <<"c3.=" << c[3] |
2651 | <<"Seed0.=" << &cseed[planes[0]] |
2652 | <<"Seed1.=" << &cseed[planes[1]] |
2653 | <<"Seed2.=" << &cseed[planes[2]] |
2654 | <<"Seed3.=" << &cseed[planes[3]] |
2655 | <<"RiemanFitter.=" << rim |
2656 | <<"\n"; |
2657 | } |
3a039a31 |
2658 | if(chi2[0] > fReconstructor->GetRecoParam() ->GetChi2Z()/*7./(3. - sLayer)*//*iter*/){ |
6e39bde4 |
2659 | //AliInfo(Form("Failed chi2 filter on chi2Z [%f].", chi2[0])); |
d611c74f |
2660 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2661 | continue; |
2662 | } |
3a039a31 |
2663 | if(chi2[1] > fReconstructor->GetRecoParam() ->GetChi2Y()/*1./(3. - sLayer)*//*iter*/){ |
6e39bde4 |
2664 | //AliInfo(Form("Failed chi2 filter on chi2Y [%f].", chi2[1])); |
d611c74f |
2665 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2666 | continue; |
2667 | } |
2668 | //AliInfo("Passed chi2 filter."); |
2669 | |
2670 | // try attaching clusters to tracklets |
6e39bde4 |
2671 | Int_t mlayers = 0; |
2672 | AliTRDcluster *cl = NULL; |
be24510a |
2673 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
d611c74f |
2674 | Int_t jLayer = planes[iLayer]; |
6e39bde4 |
2675 | Int_t nNotInChamber = 0; |
f29f13a6 |
2676 | if(!cseed[jLayer].AttachClusters(stack[jLayer], kTRUE)) continue; |
6e39bde4 |
2677 | cseed[jLayer].Fit(); |
f29f13a6 |
2678 | cseed[jLayer].UpdateUsed(); |
6e39bde4 |
2679 | cseed[jLayer].ResetClusterIter(); |
2680 | while((cl = cseed[jLayer].NextCluster())){ |
2681 | if(!cl->IsInChamber()) nNotInChamber++; |
2682 | } |
2683 | //printf("clusters[%d], used[%d], not in chamber[%d]\n", cseed[jLayer].GetN(), cseed[jLayer].GetNUsed(), nNotInChamber); |
2684 | if(cseed[jLayer].GetN() - (cseed[jLayer].GetNUsed() + nNotInChamber) < 5) continue; // checking for Cluster which are not in chamber is a much stronger restriction on real data |
d611c74f |
2685 | mlayers++; |
2686 | } |
be24510a |
2687 | |
2688 | if(mlayers < kNSeedPlanes){ |
2689 | //AliInfo(Form("Failed updating all seeds %d [%d].", mlayers, kNSeedPlanes)); |
2690 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2691 | continue; |
2692 | } |
2693 | |
2694 | // temporary exit door for the HLT |
4302c900 |
2695 | if(fReconstructor->IsHLT()){ |
be24510a |
2696 | // attach clusters to extrapolation chambers |
2697 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2698 | Int_t jLayer = planesExt[iLayer]; |
2699 | if(!(chamber = stack[jLayer])) continue; |
f29f13a6 |
2700 | cseed[jLayer].AttachClusters(chamber, kTRUE); |
6e39bde4 |
2701 | cseed[jLayer].Fit(); |
be24510a |
2702 | } |
4302c900 |
2703 | fTrackQuality[ntracks] = 1.; // dummy value |
2704 | ntracks++; |
218ba867 |
2705 | if(ntracks == kMaxTracksStack) return ntracks; |
4302c900 |
2706 | cseed += 6; |
2707 | continue; |
2708 | } |
2709 | |
be24510a |
2710 | |
f29f13a6 |
2711 | // Update Seeds and calculate Likelihood |
d611c74f |
2712 | // fit tracklets and cook likelihood |
f29f13a6 |
2713 | FitTiltedRieman(&cseed[0], kTRUE); |
2714 | for(int iLayer=0; iLayer<kNSeedPlanes; iLayer++){ |
2715 | Int_t jLayer = planes[iLayer]; |
2716 | cseed[jLayer].Fit(kTRUE); |
2717 | } |
91834b8d |
2718 | Double_t like = CookLikelihood(&cseed[0], planes); // to be checked |
d611c74f |
2719 | |
3a039a31 |
2720 | if (TMath::Log(1.E-9 + like) < fReconstructor->GetRecoParam() ->GetTrackLikelihood()){ |
d611c74f |
2721 | //AliInfo(Form("Failed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2722 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2723 | continue; |
2724 | } |
2725 | //AliInfo(Form("Passed likelihood %f[%e].", TMath::Log(1.E-9 + like), like)); |
2726 | |
2727 | // book preliminary results |
2728 | seedQuality[ntracks] = like; |
2729 | fSeedLayer[ntracks] = config;/*sLayer;*/ |
2730 | |
2731 | // attach clusters to the extrapolation seeds |
be24510a |
2732 | for(int iLayer=0; iLayer<kNPlanes-kNSeedPlanes; iLayer++){ |
2733 | Int_t jLayer = planesExt[iLayer]; |
d611c74f |
2734 | if(!(chamber = stack[jLayer])) continue; |
d611c74f |
2735 | |
2736 | // fit extrapolated seed |
2737 | if ((jLayer == 0) && !(cseed[1].IsOK())) continue; |
2738 | if ((jLayer == 5) && !(cseed[4].IsOK())) continue; |
2739 | AliTRDseedV1 pseed = cseed[jLayer]; |
f29f13a6 |
2740 | if(!pseed.AttachClusters(chamber, kTRUE)) continue; |
2741 | pseed.Fit(kTRUE); |
d611c74f |
2742 | cseed[jLayer] = pseed; |
d611c74f |
2743 | FitTiltedRieman(cseed, kTRUE); |
f29f13a6 |
2744 | cseed[jLayer].Fit(kTRUE); |
d611c74f |
2745 | } |
2746 | |
2747 | // AliInfo("Extrapolation done."); |
2748 | // Debug Stream containing all the 6 tracklets |
3a039a31 |
2749 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
29f95561 |
2750 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f |
2751 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
2752 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2753 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2754 | cstreamer << "MakeSeeds1" |
2755 | << "EventNumber=" << eventNumber |
2756 | << "CandidateNumber=" << candidateNumber |
2757 | << "S0.=" << &cseed[0] |
2758 | << "S1.=" << &cseed[1] |
2759 | << "S2.=" << &cseed[2] |
2760 | << "S3.=" << &cseed[3] |
2761 | << "S4.=" << &cseed[4] |
2762 | << "S5.=" << &cseed[5] |
2763 | << "FitterT.=" << tiltedRieman |
2764 | << "\n"; |
2765 | } |
2766 | |
b72f4eaf |
2767 | if(fReconstructor->HasImproveTracklets() && ImproveSeedQuality(stack, cseed) < 4){ |
d611c74f |
2768 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2769 | continue; |
2770 | } |
2771 | //AliInfo("Improve seed quality done."); |
2772 | |
2773 | // fit full track and cook likelihoods |
2774 | // Double_t curv = FitRieman(&cseed[0], chi2); |
2775 | // Double_t chi2ZF = chi2[0] / TMath::Max((mlayers - 3.), 1.); |
2776 | // Double_t chi2RF = chi2[1] / TMath::Max((mlayers - 3.), 1.); |
2777 | |
2778 | // do the final track fitting (Once with vertex constraint and once without vertex constraint) |
2779 | Double_t chi2Vals[3]; |
6e39bde4 |
2780 | chi2Vals[0] = FitTiltedRieman(&cseed[0], kTRUE); |
b72f4eaf |
2781 | if(fReconstructor->HasVertexConstrained()) |
d611c74f |
2782 | chi2Vals[1] = FitTiltedRiemanConstraint(&cseed[0], GetZ()); // Do Vertex Constrained fit if desired |
2783 | else |
2784 | chi2Vals[1] = 1.; |
2785 | chi2Vals[2] = GetChi2Z(&cseed[0]) / TMath::Max((mlayers - 3.), 1.); |
2786 | // Chi2 definitions in testing stage |
2787 | //chi2Vals[2] = GetChi2ZTest(&cseed[0]); |
2788 | fTrackQuality[ntracks] = CalculateTrackLikelihood(&cseed[0], &chi2Vals[0]); |
2789 | //AliInfo("Hyperplane fit done\n"); |
fac58f00 |
2790 | |
3a039a31 |
2791 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
29f95561 |
2792 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
d611c74f |
2793 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2794 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2795 | TLinearFitter *fitterTC = GetTiltedRiemanFitterConstraint(); |
2796 | TLinearFitter *fitterT = GetTiltedRiemanFitter(); |
91834b8d |
2797 | Int_t ncls = 0; |
2798 | for(Int_t iseed = 0; iseed < kNPlanes; iseed++){ |
2799 | ncls += cseed[iseed].IsOK() ? cseed[iseed].GetN2() : 0; |
2800 | } |
d611c74f |
2801 | cstreamer << "MakeSeeds2" |
2802 | << "EventNumber=" << eventNumber |
2803 | << "CandidateNumber=" << candidateNumber |
2804 | << "Chi2TR=" << chi2Vals[0] |
2805 | << "Chi2TC=" << chi2Vals[1] |
2806 | << "Nlayers=" << mlayers |
91834b8d |
2807 | << "NClusters=" << ncls |
d611c74f |
2808 | << "Like=" << like |
2809 | << "S0.=" << &cseed[0] |
2810 | << "S1.=" << &cseed[1] |
2811 | << "S2.=" << &cseed[2] |
2812 | << "S3.=" << &cseed[3] |
2813 | << "S4.=" << &cseed[4] |
2814 | << "S5.=" << &cseed[5] |
d611c74f |
2815 | << "FitterT.=" << fitterT |
2816 | << "FitterTC.=" << fitterTC |
2817 | << "\n"; |
2818 | } |
2819 | |
2820 | ntracks++; |
2821 | AliTRDtrackerDebug::SetCandidateNumber(AliTRDtrackerDebug::GetCandidateNumber() + 1); |
2822 | if(ntracks == kMaxTracksStack){ |
2823 | AliWarning(Form("Number of seeds reached maximum allowed (%d) in stack.", kMaxTracksStack)); |
2824 | return ntracks; |
2825 | } |
2826 | cseed += 6; |
41702fec |
2827 | } |
2828 | } |
2829 | } |
41702fec |
2830 | |
2831 | return ntracks; |
e4f2f73d |
2832 | } |
2833 | |
2834 | //_____________________________________________________________________________ |
0906e73e |
2835 | AliTRDtrackV1* AliTRDtrackerV1::MakeTrack(AliTRDseedV1 *seeds, Double_t *params) |
e4f2f73d |
2836 | { |
afa21247 |
2837 | // |
2838 | // Build a TRD track out of tracklet candidates |
2839 | // |
2840 | // Parameters : |
2841 | // seeds : array of tracklets |
2842 | // params : array of track parameters as they are estimated by stand alone tracker. 7 elements. |
2843 | // [0] - radial position of the track at reference point |
2844 | // [1] - y position of the fit at [0] |
2845 | // [2] - z position of the fit at [0] |
2846 | // [3] - snp of the first tracklet |
2847 | // [4] - tgl of the first tracklet |
2848 | // [5] - curvature of the Riemann fit - 1/pt |
2849 | // [6] - sector rotation angle |
2850 | // |
2851 | // Output : |
2852 | // The TRD track. |
2853 | // |
2854 | // Initialize the TRD track based on the parameters of the fit and a parametric covariance matrix |
2855 | // (diagonal with constant variance terms TODO - correct parameterization) |
2856 | // |
2857 | // In case of HLT just register the tracklets in the tracker and return values of the Riemann fit. For the |
2858 | // offline case perform a full Kalman filter on the already found tracklets (see AliTRDtrackerV1::FollowBackProlongation() |
2859 | // for details). Do also MC label calculation and PID if propagation successfully. |
41702fec |
2860 | |
afa21247 |
2861 | |
41702fec |
2862 | Double_t alpha = AliTRDgeometry::GetAlpha(); |
2863 | Double_t shift = AliTRDgeometry::GetAlpha()/2.0; |
2864 | Double_t c[15]; |
2865 | |
afa21247 |
2866 | c[ 0] = 0.2; // s^2_y |
2867 | c[ 1] = 0.0; c[ 2] = 2.0; // s^2_z |
2868 | c[ 3] = 0.0; c[ 4] = 0.0; c[ 5] = 0.02; // s^2_snp |
2869 | c[ 6] = 0.0; c[ 7] = 0.0; c[ 8] = 0.0; c[ 9] = 0.1; // s^2_tgl |
2870 | 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 |
2871 | |
d20df6fc |
2872 | AliTRDtrackV1 track(seeds, ¶ms[1], c, params[0], params[6]*alpha+shift); |
2873 | track.PropagateTo(params[0]-5.0); |
f29f13a6 |
2874 | AliTRDseedV1 *ptrTracklet = 0x0; |
9887cc9f |
2875 | |
2876 | // skip Kalman filter for HLT |
91834b8d |
2877 | if(fReconstructor->IsHLT()){ |
9887cc9f |
2878 | for (Int_t jLayer = 0; jLayer < AliTRDgeometry::kNlayer; jLayer++) { |
2879 | track.UnsetTracklet(jLayer); |
2880 | ptrTracklet = &seeds[jLayer]; |
2881 | if(!ptrTracklet->IsOK()) continue; |
6e39bde4 |
2882 | if(TMath::Abs(ptrTracklet->GetYref(1) - ptrTracklet->GetYfit(1)) >= .2) continue; // check this condition with Marian |
9887cc9f |
2883 | ptrTracklet = SetTracklet(ptrTracklet); |
f29f13a6 |
2884 | ptrTracklet->UseClusters(); |
91834b8d |
2885 | track.SetTracklet(ptrTracklet, fTracklets->GetEntriesFast()-1); |
2886 | } |
d78d7df0 |
2887 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
799e38d7 |
2888 | ptrTrack->CookPID(); |
6e39bde4 |
2889 | ptrTrack->SetReconstructor(fReconstructor); |
d78d7df0 |
2890 | return ptrTrack; |
91834b8d |
2891 | } |
393fda1c |
2892 | |
d20df6fc |
2893 | track.ResetCovariance(1); |
e79f8eb0 |
2894 | Int_t nc = TMath::Abs(FollowBackProlongation(track)); |
393fda1c |
2895 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) > 5){ |
2896 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2897 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2898 | Double_t p[5]; // Track Params for the Debug Stream |
2899 | track.GetExternalParameters(params[0], p); |
29f95561 |
2900 | TTreeSRedirector &cs = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
393fda1c |
2901 | cs << "MakeTrack" |
2902 | << "EventNumber=" << eventNumber |
2903 | << "CandidateNumber=" << candidateNumber |
2904 | << "nc=" << nc |
2905 | << "X=" << params[0] |
2906 | << "Y=" << p[0] |
2907 | << "Z=" << p[1] |
2908 | << "snp=" << p[2] |
2909 | << "tnd=" << p[3] |
2910 | << "crv=" << p[4] |
2911 | << "Yin=" << params[1] |
2912 | << "Zin=" << params[2] |
2913 | << "snpin=" << params[3] |
2914 | << "tndin=" << params[4] |
2915 | << "crvin=" << params[5] |
2916 | << "track.=" << &track |
2917 | << "\n"; |
2918 | } |
d20df6fc |
2919 | if (nc < 30) return 0x0; |
2920 | |
2921 | AliTRDtrackV1 *ptrTrack = SetTrack(&track); |
215f7116 |
2922 | ptrTrack->SetReconstructor(fReconstructor); |
48f8adf3 |
2923 | ptrTrack->CookLabel(.9); |
24253b0a |
2924 | |
d20df6fc |
2925 | // computes PID for track |
2926 | ptrTrack->CookPID(); |
2927 | // update calibration references using this track |
48f8adf3 |
2928 | AliTRDCalibraFillHisto *calibra = AliTRDCalibraFillHisto::Instance(); |
2929 | if (!calibra){ |
2930 | AliInfo("Could not get Calibra instance\n"); |
2931 | if(calibra->GetHisto2d()) calibra->UpdateHistogramsV1(ptrTrack); |
2932 | } |
d20df6fc |
2933 | return ptrTrack; |
e4f2f73d |
2934 | } |
2935 | |
0906e73e |
2936 | |
e4f2f73d |
2937 | //____________________________________________________________________ |
eb38ed55 |
2938 | Int_t AliTRDtrackerV1::ImproveSeedQuality(AliTRDtrackingChamber **stack, AliTRDseedV1 *cseed) |
e4f2f73d |
2939 | { |
41702fec |
2940 | // |
2941 | // Sort tracklets according to "quality" and try to "improve" the first 4 worst |
2942 | // |
2943 | // Parameters : |
2944 | // layers : Array of propagation layers for a stack/supermodule |
2945 | // cseed : Array of 6 seeding tracklets which has to be improved |
2946 | // |
f29f13a6 |
2947 | // Output : |
41702fec |
2948 | // cssed : Improved seeds |
2949 | // |
2950 | // Detailed description |
2951 | // |
2952 | // Iterative procedure in which new clusters are searched for each |
2953 | // tracklet seed such that the seed quality (see AliTRDseed::GetQuality()) |
2954 | // can be maximized. If some optimization is found the old seeds are replaced. |
2955 | // |
2956 | // debug level: 7 |
2957 | // |
2958 | |
2959 | // make a local working copy |
2960 | AliTRDtrackingChamber *chamber = 0x0; |
2961 | AliTRDseedV1 bseed[6]; |
2962 | Int_t nLayers = 0; |
2963 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) bseed[jLayer] = cseed[jLayer]; |
2964 | |
2965 | Float_t lastquality = 10000.0; |
2966 | Float_t lastchi2 = 10000.0; |
2967 | Float_t chi2 = 1000.0; |
2968 | |
2969 | for (Int_t iter = 0; iter < 4; iter++) { |
2970 | Float_t sumquality = 0.0; |
2971 | Float_t squality[6]; |
2972 | Int_t sortindexes[6]; |
2973 | |
2974 | for (Int_t jLayer = 0; jLayer < 6; jLayer++) { |
3a039a31 |
2975 | squality[jLayer] = bseed[jLayer].IsOK() ? bseed[jLayer].GetQuality(kTRUE) : 1000.; |
41702fec |
2976 | sumquality += squality[jLayer]; |
2977 | } |
2978 | if ((sumquality >= lastquality) || (chi2 > lastchi2)) break; |
2979 | |
2980 | nLayers = 0; |
2981 | lastquality = sumquality; |
2982 | lastchi2 = chi2; |
2983 | if (iter > 0) for (Int_t jLayer = 0; jLayer < 6; jLayer++) cseed[jLayer] = bseed[jLayer]; |
2984 | |
2985 | TMath::Sort(6, squality, sortindexes, kFALSE); |
2986 | for (Int_t jLayer = 5; jLayer > 1; jLayer--) { |
2987 | Int_t bLayer = sortindexes[jLayer]; |
2988 | if(!(chamber = stack[bLayer])) continue; |
f29f13a6 |
2989 | bseed[bLayer].AttachClusters(chamber, kTRUE); |
2990 | bseed[bLayer].Fit(kTRUE); |
41702fec |
2991 | if(bseed[bLayer].IsOK()) nLayers++; |
2992 | } |
2993 | |
2994 | chi2 = FitTiltedRieman(bseed, kTRUE); |
3a039a31 |
2995 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 7){ |
41702fec |
2996 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
2997 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
2998 | TLinearFitter *tiltedRieman = GetTiltedRiemanFitter(); |
29f95561 |
2999 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
3000 | cstreamer << "ImproveSeedQuality" |
3001 | << "EventNumber=" << eventNumber |
3002 | << "CandidateNumber=" << candidateNumber |
3003 | << "Iteration=" << iter |
3004 | << "S0.=" << &bseed[0] |
3005 | << "S1.=" << &bseed[1] |
3006 | << "S2.=" << &bseed[2] |
3007 | << "S3.=" << &bseed[3] |
3008 | << "S4.=" << &bseed[4] |
3009 | << "S5.=" << &bseed[5] |
3010 | << "FitterT.=" << tiltedRieman |
3011 | << "\n"; |
3012 | } |
3013 | } // Loop: iter |
41702fec |
3014 | // we are sure that at least 2 tracklets are OK ! |
3015 | return nLayers+2; |
e4f2f73d |
3016 | } |
3017 | |
eb38ed55 |
3018 | //_________________________________________________________________________ |
3019 | Double_t AliTRDtrackerV1::CalculateTrackLikelihood(AliTRDseedV1 *tracklets, Double_t *chi2){ |
41702fec |
3020 | // |
3021 | // Calculates the Track Likelihood value. This parameter serves as main quality criterion for |
3022 | // the track selection |
3023 | // The likelihood value containes: |
3024 | // - The chi2 values from the both fitters and the chi2 values in z-direction from a linear fit |
3025 | // - The Sum of the Parameter |slope_ref - slope_fit|/Sigma of the tracklets |
3026 | // For all Parameters an exponential dependency is used |
3027 | // |
3028 | // Parameters: - Array of tracklets (AliTRDseedV1) related to the track candidate |
3029 | // - Array of chi2 values: |
3030 | // * Non-Constrained Tilted Riemann fit |
3031 | // * Vertex-Constrained Tilted Riemann fit |
3032 | // * z-Direction from Linear fit |
3033 | // Output: - The calculated track likelihood |
3034 | // |
3035 | // debug level 2 |
3036 | // |
3037 | |
f29f13a6 |
3038 | Double_t chi2phi = 0, nLayers = 0; |
41702fec |
3039 | for (Int_t iLayer = 0; iLayer < kNPlanes; iLayer++) { |
3040 | if(!tracklets[iLayer].IsOK()) continue; |
f29f13a6 |
3041 | chi2phi += tracklets[iLayer].GetChi2Phi(); |
41702fec |
3042 | nLayers++; |
3043 | } |
f29f13a6 |
3044 | chi2phi /= Float_t (nLayers - 2.0); |
41702fec |
3045 | |
3046 | Double_t likeChi2Z = TMath::Exp(-chi2[2] * 0.14); // Chi2Z |
b72f4eaf |
3047 | Double_t likeChi2TC = (fReconstructor->HasVertexConstrained()) ? |
d20df6fc |
3048 | TMath::Exp(-chi2[1] * 0.677) : 1; // Constrained Tilted Riemann |
6e39bde4 |
3049 | Double_t likeChi2TR = TMath::Exp(-chi2[0] * 0.0078); // Non-constrained Tilted Riemann |
3050 | Double_t likeChi2Phi= TMath::Exp(-chi2phi * 3.23);//3.23 |
f29f13a6 |
3051 | Double_t trackLikelihood = likeChi2Z * likeChi2TR * likeChi2Phi; |
41702fec |
3052 | |
3a039a31 |
3053 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec |
3054 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3055 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
29f95561 |
3056 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
3057 | cstreamer << "CalculateTrackLikelihood0" |
3058 | << "EventNumber=" << eventNumber |
3059 | << "CandidateNumber=" << candidateNumber |
3060 | << "LikeChi2Z=" << likeChi2Z |
3061 | << "LikeChi2TR=" << likeChi2TR |
3062 | << "LikeChi2TC=" << likeChi2TC |
f29f13a6 |
3063 | << "LikeChi2Phi=" << likeChi2Phi |
41702fec |
3064 | << "TrackLikelihood=" << trackLikelihood |
3065 | << "\n"; |
3066 | } |
6e39bde4 |
3067 | |
41702fec |
3068 | return trackLikelihood; |
e4f2f73d |
3069 | } |
3070 | |
3071 | //____________________________________________________________________ |
91834b8d |
3072 | Double_t AliTRDtrackerV1::CookLikelihood(AliTRDseedV1 *cseed, Int_t planes[4]) |
e4f2f73d |
3073 | { |
41702fec |
3074 | // |
3075 | // Calculate the probability of this track candidate. |
3076 | // |
3077 | // Parameters : |
3078 | // cseeds : array of candidate tracklets |
3079 | // planes : array of seeding planes (see seeding configuration) |
3080 | // chi2 : chi2 values (on the Z and Y direction) from the rieman fit of the track. |
3081 | // |
3082 | // Output : |
3083 | // likelihood value |
3084 | // |
3085 | // Detailed description |
3086 | // |
3087 | // The track quality is estimated based on the following 4 criteria: |
3088 | // 1. precision of the rieman fit on the Y direction (likea) |
3089 | // 2. chi2 on the Y direction (likechi2y) |
3090 | // 3. chi2 on the Z direction (likechi2z) |
3091 | // 4. number of attached clusters compared to a reference value |
3092 | // (see AliTRDrecoParam::fkFindable) (likeN) |
3093 | // |
3094 | // The distributions for each type of probabilities are given below as of |
3095 | // (date). They have to be checked to assure consistency of estimation. |
3096 | // |
3097 | |
3098 | // ratio of the total number of clusters/track which are expected to be found by the tracker. |
91834b8d |
3099 | const AliTRDrecoParam *fRecoPars = fReconstructor->GetRecoParam(); |
41702fec |
3100 | |
91834b8d |
3101 | Double_t chi2y = GetChi2Y(&cseed[0]); |
3102 | Double_t chi2z = GetChi2Z(&cseed[0]); |
3103 | |
8ae98148 |
3104 | Float_t nclusters = 0.; |
41702fec |
3105 | Double_t sumda = 0.; |
3106 | for(UChar_t ilayer = 0; ilayer < 4; ilayer++){ |
3107 | Int_t jlayer = planes[ilayer]; |
3108 | nclusters += cseed[jlayer].GetN2(); |
e3cf3d02 |
3109 | sumda += TMath::Abs(cseed[jlayer].GetYfit(1) - cseed[jlayer].GetYref(1)); |
41702fec |
3110 | } |
8ae98148 |
3111 | nclusters *= .25; |
3112 | |
5a2e200c |
3113 | Double_t likea = TMath::Exp(-sumda * fRecoPars->GetPhiSlope()); |
41702fec |
3114 | Double_t likechi2y = 0.0000000001; |
5a2e200c |
3115 | if (fReconstructor->IsCosmic() || chi2y < fRecoPars->GetChi2YCut()) likechi2y += TMath::Exp(-TMath::Sqrt(chi2y) * fRecoPars->GetChi2YSlope()); |
3116 | Double_t likechi2z = TMath::Exp(-chi2z * fRecoPars->GetChi2ZSlope()); |
8ae98148 |
3117 | Double_t likeN = TMath::Exp(-(fRecoPars->GetNMeanClusters() - nclusters) / fRecoPars->GetNSigmaClusters()); |
41702fec |
3118 | Double_t like = likea * likechi2y * likechi2z * likeN; |
3119 | |
3a039a31 |
3120 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker) >= 2){ |
41702fec |
3121 | Int_t eventNumber = AliTRDtrackerDebug::GetEventNumber(); |
3122 | Int_t candidateNumber = AliTRDtrackerDebug::GetCandidateNumber(); |
91834b8d |
3123 | Int_t nTracklets = 0; Float_t mean_ncls = 0; |
3124 | for(Int_t iseed=0; iseed < kNPlanes; iseed++){ |
3125 | if(!cseed[iseed].IsOK()) continue; |
3126 | nTracklets++; |
3127 | mean_ncls += cseed[iseed].GetN2(); |
3128 | } |
3129 | if(nTracklets) mean_ncls /= nTracklets; |
41702fec |
3130 | // The Debug Stream contains the seed |
29f95561 |
3131 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
41702fec |
3132 | cstreamer << "CookLikelihood" |
3133 | << "EventNumber=" << eventNumber |
3134 | << "CandidateNumber=" << candidateNumber |
3135 | << "tracklet0.=" << &cseed[0] |
3136 | << "tracklet1.=" << &cseed[1] |
3137 | << "tracklet2.=" << &cseed[2] |
3138 | << "tracklet3.=" << &cseed[3] |
3139 | << "tracklet4.=" << &cseed[4] |
3140 | << "tracklet5.=" << &cseed[5] |
3141 | << "sumda=" << sumda |
91834b8d |
3142 | << "chi2y=" << chi2y |
3143 | << "chi2z=" << chi2z |
41702fec |
3144 | << "likea=" << likea |
3145 | << "likechi2y=" << likechi2y |
3146 | << "likechi2z=" << likechi2z |
3147 | << "nclusters=" << nclusters |
3148 | << "likeN=" << likeN |
3149 | << "like=" << like |
91834b8d |
3150 | << "meanncls=" << mean_ncls |
41702fec |
3151 | << "\n"; |
3152 | } |
3153 | |
3154 | return like; |
e4f2f73d |
3155 | } |
3156 | |
e4f2f73d |
3157 | //____________________________________________________________________ |
0906e73e |
3158 | void AliTRDtrackerV1::GetSeedingConfig(Int_t iconfig, Int_t planes[4]) |
e4f2f73d |
3159 | { |
41702fec |
3160 | // |
3161 | // Map seeding configurations to detector planes. |
3162 | // |
3163 | // Parameters : |
3164 | // iconfig : configuration index |
3165 | // planes : member planes of this configuration. On input empty. |
3166 | // |
3167 | // Output : |
3168 | // planes : contains the planes which are defining the configuration |
3169 | // |
3170 | // Detailed description |
3171 | // |
3172 | // Here is the list of seeding planes configurations together with |
3173 | // their topological classification: |
3174 | // |
3175 | // 0 - 5432 TQ 0 |
3176 | // 1 - 4321 TQ 0 |
3177 | // 2 - 3210 TQ 0 |
3178 | // 3 - 5321 TQ 1 |
3179 | // 4 - 4210 TQ 1 |
3180 | // 5 - 5431 TQ 1 |
3181 | // 6 - 4320 TQ 1 |
3182 | // 7 - 5430 TQ 2 |
3183 | // 8 - 5210 TQ 2 |
3184 | // 9 - 5421 TQ 3 |
3185 | // 10 - 4310 TQ 3 |
3186 | // 11 - 5410 TQ 4 |
3187 | // 12 - 5420 TQ 5 |
3188 | // 13 - 5320 TQ 5 |
3189 | // 14 - 5310 TQ 5 |
3190 | // |
3191 | // The topologic quality is modeled as follows: |
3192 | // 1. The general model is define by the equation: |
3193 | // p(conf) = exp(-conf/2) |
3194 | // 2. According to the topologic classification, configurations from the same |
3195 | // class are assigned the agerage value over the model values. |
3196 | // 3. Quality values are normalized. |
3197 | // |
3198 | // The topologic quality distribution as function of configuration is given below: |
3199 | //Begin_Html |
3200 | // <img src="gif/topologicQA.gif"> |
3201 | //End_Html |
3202 | // |
3203 | |
3204 | switch(iconfig){ |
3205 | case 0: // 5432 TQ 0 |
3206 | planes[0] = 2; |
3207 | planes[1] = 3; |
3208 | planes[2] = 4; |
3209 | planes[3] = 5; |
3210 | break; |
3211 | case 1: // 4321 TQ 0 |
3212 | planes[0] = 1; |
3213 | planes[1] = 2; |
3214 | planes[2] = 3; |
3215 | planes[3] = 4; |
3216 | break; |
3217 | case 2: // 3210 TQ 0 |
3218 | planes[0] = 0; |
3219 | planes[1] = 1; |
3220 | planes[2] = 2; |
3221 | planes[3] = 3; |
3222 | break; |
3223 | case 3: // 5321 TQ 1 |
3224 | planes[0] = 1; |
3225 | planes[1] = 2; |
3226 | planes[2] = 3; |
3227 | planes[3] = 5; |
3228 | break; |
3229 | case 4: // 4210 TQ 1 |
3230 | planes[0] = 0; |
3231 | planes[1] = 1; |
3232 | planes[2] = 2; |
3233 | planes[3] = 4; |
3234 | break; |
3235 | case 5: // 5431 TQ 1 |
3236 | planes[0] = 1; |
3237 | planes[1] = 3; |
3238 | planes[2] = 4; |
3239 | planes[3] = 5; |
3240 | break; |
3241 | case 6: // 4320 TQ 1 |
3242 | planes[0] = 0; |
3243 | planes[1] = 2; |
3244 | planes[2] = 3; |
3245 | planes[3] = 4; |
3246 | break; |
3247 | case 7: // 5430 TQ 2 |
3248 | planes[0] = 0; |
3249 | planes[1] = 3; |
3250 | planes[2] = 4; |
3251 | planes[3] = 5; |
3252 | break; |
3253 | case 8: // 5210 TQ 2 |
3254 | planes[0] = 0; |
3255 | planes[1] = 1; |
3256 | planes[2] = 2; |
3257 | planes[3] = 5; |
3258 | break; |
3259 | case 9: // 5421 TQ 3 |
3260 | planes[0] = 1; |
3261 | planes[1] = 2; |
3262 | planes[2] = 4; |
3263 | planes[3] = 5; |
3264 | break; |
3265 | case 10: // 4310 TQ 3 |
3266 | planes[0] = 0; |
3267 | planes[1] = 1; |
3268 | planes[2] = 3; |
3269 | planes[3] = 4; |
3270 | break; |
3271 | case 11: // 5410 TQ 4 |
3272 | planes[0] = 0; |
3273 | planes[1] = 1; |
3274 | planes[2] = 4; |
3275 | planes[3] = 5; |
3276 | break; |
3277 | case 12: // 5420 TQ 5 |
3278 | planes[0] = 0; |
3279 | planes[1] = 2; |
3280 | planes[2] = 4; |
3281 | planes[3] = 5; |
3282 | break; |
3283 | case 13: // 5320 TQ 5 |
3284 | planes[0] = 0; |
3285 | planes[1] = 2; |
3286 | planes[2] = 3; |
3287 | planes[3] = 5; |
3288 | break; |
3289 | case 14: // 5310 TQ 5 |
3290 | planes[0] = 0; |
3291 | planes[1] = 1; |
3292 | planes[2] = 3; |
3293 | planes[3] = 5; |
3294 | break; |
3295 | } |
e4f2f73d |
3296 | } |
3297 | |
3298 | //____________________________________________________________________ |
0906e73e |
3299 | void AliTRDtrackerV1::GetExtrapolationConfig(Int_t iconfig, Int_t planes[2]) |
e4f2f73d |
3300 | { |
41702fec |
3301 | // |
3302 | // Returns the extrapolation planes for a seeding configuration. |
3303 | // |
3304 | // Parameters : |
3305 | // iconfig : configuration index |
3306 | // planes : planes which are not in this configuration. On input empty. |
3307 | // |
3308 | // Output : |
3309 | // planes : contains the planes which are not in the configuration |
3310 | // |
3311 | // Detailed description |
3312 | // |
3313 | |
3314 | switch(iconfig){ |
3315 | case 0: // 5432 TQ 0 |
|