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e4f2f73d | 1 | /************************************************************************** |
29b87567 | 2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
e4f2f73d | 15 | |
16 | /* $Id$ */ | |
17 | ||
18 | //////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // The TRD track seed // | |
21 | // // | |
22 | // Authors: // | |
23 | // Alex Bercuci <A.Bercuci@gsi.de> // | |
24 | // Markus Fasel <M.Fasel@gsi.de> // | |
25 | // // | |
26 | //////////////////////////////////////////////////////////////////////////// | |
27 | ||
28 | #include "TMath.h" | |
29 | #include "TLinearFitter.h" | |
eb38ed55 | 30 | #include "TClonesArray.h" // tmp |
31 | #include <TTreeStream.h> | |
e4f2f73d | 32 | |
33 | #include "AliLog.h" | |
34 | #include "AliMathBase.h" | |
35 | ||
03cef9b2 | 36 | #include "AliTRDpadPlane.h" |
e4f2f73d | 37 | #include "AliTRDcluster.h" |
f3d3af1b | 38 | #include "AliTRDseedV1.h" |
39 | #include "AliTRDtrackV1.h" | |
e4f2f73d | 40 | #include "AliTRDcalibDB.h" |
eb38ed55 | 41 | #include "AliTRDchamberTimeBin.h" |
42 | #include "AliTRDtrackingChamber.h" | |
43 | #include "AliTRDtrackerV1.h" | |
44 | #include "AliTRDReconstructor.h" | |
e4f2f73d | 45 | #include "AliTRDrecoParam.h" |
0906e73e | 46 | #include "Cal/AliTRDCalPID.h" |
e4f2f73d | 47 | |
e4f2f73d | 48 | ClassImp(AliTRDseedV1) |
49 | ||
50 | //____________________________________________________________________ | |
ae4e8b84 | 51 | AliTRDseedV1::AliTRDseedV1(Int_t det) |
e4f2f73d | 52 | :AliTRDseed() |
3a039a31 | 53 | ,fReconstructor(0x0) |
ae4e8b84 | 54 | ,fClusterIter(0x0) |
55 | ,fClusterIdx(0) | |
56 | ,fDet(det) | |
0906e73e | 57 | ,fMom(0.) |
bcb6fb78 | 58 | ,fSnp(0.) |
59 | ,fTgl(0.) | |
60 | ,fdX(0.) | |
e4f2f73d | 61 | { |
62 | // | |
63 | // Constructor | |
64 | // | |
29b87567 | 65 | //printf("AliTRDseedV1::AliTRDseedV1()\n"); |
e44586fb | 66 | |
29b87567 | 67 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.; |
68 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.; | |
e4f2f73d | 69 | } |
70 | ||
71 | //____________________________________________________________________ | |
0906e73e | 72 | AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref) |
e4f2f73d | 73 | :AliTRDseed((AliTRDseed&)ref) |
43d6ad34 | 74 | ,fReconstructor(ref.fReconstructor) |
ae4e8b84 | 75 | ,fClusterIter(0x0) |
76 | ,fClusterIdx(0) | |
77 | ,fDet(ref.fDet) | |
0906e73e | 78 | ,fMom(ref.fMom) |
bcb6fb78 | 79 | ,fSnp(ref.fSnp) |
80 | ,fTgl(ref.fTgl) | |
81 | ,fdX(ref.fdX) | |
e4f2f73d | 82 | { |
83 | // | |
84 | // Copy Constructor performing a deep copy | |
85 | // | |
86 | ||
29b87567 | 87 | //printf("AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &)\n"); |
88 | SetBit(kOwner, kFALSE); | |
89 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice]; | |
90 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec]; | |
fbb2ea06 | 91 | } |
d9950a5a | 92 | |
0906e73e | 93 | |
e4f2f73d | 94 | //____________________________________________________________________ |
95 | AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref) | |
96 | { | |
97 | // | |
98 | // Assignment Operator using the copy function | |
99 | // | |
100 | ||
29b87567 | 101 | if(this != &ref){ |
102 | ref.Copy(*this); | |
103 | } | |
221ab7e0 | 104 | SetBit(kOwner, kFALSE); |
105 | ||
29b87567 | 106 | return *this; |
e4f2f73d | 107 | |
108 | } | |
109 | ||
110 | //____________________________________________________________________ | |
111 | AliTRDseedV1::~AliTRDseedV1() | |
112 | { | |
113 | // | |
114 | // Destructor. The RecoParam object belongs to the underlying tracker. | |
115 | // | |
116 | ||
29b87567 | 117 | //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO"); |
e4f2f73d | 118 | |
29b87567 | 119 | if(IsOwner()) |
120 | for(int itb=0; itb<knTimebins; itb++){ | |
121 | if(!fClusters[itb]) continue; | |
122 | //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb)); | |
123 | delete fClusters[itb]; | |
124 | fClusters[itb] = 0x0; | |
125 | } | |
e4f2f73d | 126 | } |
127 | ||
128 | //____________________________________________________________________ | |
129 | void AliTRDseedV1::Copy(TObject &ref) const | |
130 | { | |
131 | // | |
132 | // Copy function | |
133 | // | |
134 | ||
29b87567 | 135 | //AliInfo(""); |
136 | AliTRDseedV1 &target = (AliTRDseedV1 &)ref; | |
137 | ||
ae4e8b84 | 138 | target.fClusterIter = 0x0; |
139 | target.fClusterIdx = 0; | |
140 | target.fDet = fDet; | |
29b87567 | 141 | target.fMom = fMom; |
142 | target.fSnp = fSnp; | |
143 | target.fTgl = fTgl; | |
144 | target.fdX = fdX; | |
145 | target.fReconstructor = fReconstructor; | |
146 | ||
147 | for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice]; | |
148 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec]; | |
149 | ||
150 | AliTRDseed::Copy(target); | |
e4f2f73d | 151 | } |
152 | ||
0906e73e | 153 | |
154 | //____________________________________________________________ | |
f3d3af1b | 155 | Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track) |
0906e73e | 156 | { |
157 | // Initialize this tracklet using the track information | |
158 | // | |
159 | // Parameters: | |
160 | // track - the TRD track used to initialize the tracklet | |
161 | // | |
162 | // Detailed description | |
163 | // The function sets the starting point and direction of the | |
164 | // tracklet according to the information from the TRD track. | |
165 | // | |
166 | // Caution | |
167 | // The TRD track has to be propagated to the beginning of the | |
168 | // chamber where the tracklet will be constructed | |
169 | // | |
170 | ||
29b87567 | 171 | Double_t y, z; |
172 | if(!track->GetProlongation(fX0, y, z)) return kFALSE; | |
173 | fYref[0] = y; | |
174 | fYref[1] = track->GetSnp()/(1. - track->GetSnp()*track->GetSnp()); | |
175 | fZref[0] = z; | |
176 | fZref[1] = track->GetTgl(); | |
0906e73e | 177 | |
29b87567 | 178 | //printf("Tracklet ref x[%7.3f] y[%7.3f] z[%7.3f], snp[%f] tgl[%f]\n", fX0, fYref[0], fZref[0], track->GetSnp(), track->GetTgl()); |
179 | return kTRUE; | |
0906e73e | 180 | } |
181 | ||
bcb6fb78 | 182 | |
183 | //____________________________________________________________________ | |
184 | void AliTRDseedV1::CookdEdx(Int_t nslices) | |
185 | { | |
186 | // Calculates average dE/dx for all slices and store them in the internal array fdEdx. | |
187 | // | |
188 | // Parameters: | |
189 | // nslices : number of slices for which dE/dx should be calculated | |
190 | // Output: | |
191 | // store results in the internal array fdEdx. This can be accessed with the method | |
192 | // AliTRDseedV1::GetdEdx() | |
193 | // | |
194 | // Detailed description | |
195 | // Calculates average dE/dx for all slices. Depending on the PID methode | |
196 | // the number of slices can be 3 (LQ) or 8(NN). | |
197 | // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) i.e. | |
198 | // | |
199 | // dQ/dl = qc/(dx * sqrt(1 + dy/dx^2 + dz/dx^2)) | |
200 | // | |
201 | // The following effects are included in the calculation: | |
202 | // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice) | |
203 | // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing()) | |
204 | // 3. cluster size | |
205 | // | |
206 | ||
29b87567 | 207 | Int_t nclusters[knSlices]; |
208 | for(int i=0; i<knSlices; i++){ | |
209 | fdEdx[i] = 0.; | |
210 | nclusters[i] = 0; | |
211 | } | |
212 | Float_t clength = (/*.5 * */AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); | |
213 | ||
214 | AliTRDcluster *cluster = 0x0; | |
215 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){ | |
216 | if(!(cluster = fClusters[ic])) continue; | |
217 | Float_t x = cluster->GetX(); | |
218 | ||
219 | // Filter clusters for dE/dx calculation | |
220 | ||
221 | // 1.consider calibration effects for slice determination | |
222 | Int_t slice; | |
223 | if(cluster->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / clength); | |
224 | else slice = x < fX0 ? 0 : nslices-1; | |
225 | ||
226 | // 2. take sharing into account | |
227 | Float_t w = cluster->IsShared() ? .5 : 1.; | |
228 | ||
229 | // 3. take into account large clusters TODO | |
230 | //w *= c->GetNPads() > 3 ? .8 : 1.; | |
231 | ||
232 | //CHECK !!! | |
233 | fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic]; | |
234 | nclusters[slice]++; | |
235 | } // End of loop over clusters | |
236 | ||
cd40b287 | 237 | //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){ |
238 | if(nslices == AliTRDReconstructor::kLQslices){ | |
29b87567 | 239 | // calculate mean charge per slice (only LQ PID) |
240 | for(int is=0; is<nslices; is++){ | |
241 | if(nclusters[is]) fdEdx[is] /= nclusters[is]; | |
242 | } | |
243 | } | |
bcb6fb78 | 244 | } |
245 | ||
b83573da | 246 | |
bcb6fb78 | 247 | //____________________________________________________________________ |
248 | Float_t AliTRDseedV1::GetdQdl(Int_t ic) const | |
249 | { | |
29b87567 | 250 | return fClusters[ic] ? TMath::Abs(fClusters[ic]->GetQ()) /fdX / TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]) : 0.; |
bcb6fb78 | 251 | } |
252 | ||
0906e73e | 253 | //____________________________________________________________________ |
254 | Double_t* AliTRDseedV1::GetProbability() | |
255 | { | |
256 | // Fill probability array for tracklet from the DB. | |
257 | // | |
258 | // Parameters | |
259 | // | |
260 | // Output | |
261 | // returns pointer to the probability array and 0x0 if missing DB access | |
262 | // | |
263 | // Detailed description | |
264 | ||
29b87567 | 265 | |
266 | // retrive calibration db | |
0906e73e | 267 | AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); |
268 | if (!calibration) { | |
269 | AliError("No access to calibration data"); | |
270 | return 0x0; | |
271 | } | |
272 | ||
3a039a31 | 273 | if (!fReconstructor) { |
274 | AliError("Reconstructor not set."); | |
4ba1d6ae | 275 | return 0x0; |
276 | } | |
277 | ||
0906e73e | 278 | // Retrieve the CDB container class with the parametric detector response |
3a039a31 | 279 | const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod()); |
0906e73e | 280 | if (!pd) { |
281 | AliError("No access to AliTRDCalPID object"); | |
282 | return 0x0; | |
283 | } | |
29b87567 | 284 | //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName())); |
10f75631 | 285 | |
29b87567 | 286 | // calculate tracklet length TO DO |
0906e73e | 287 | Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); |
288 | /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane])); | |
289 | ||
290 | //calculate dE/dx | |
3a039a31 | 291 | CookdEdx(fReconstructor->GetNdEdxSlices()); |
0906e73e | 292 | |
293 | // Sets the a priori probabilities | |
294 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) { | |
ae4e8b84 | 295 | fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, GetPlane()); |
0906e73e | 296 | } |
297 | ||
29b87567 | 298 | return &fProb[0]; |
0906e73e | 299 | } |
300 | ||
e4f2f73d | 301 | //____________________________________________________________________ |
302 | Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const | |
303 | { | |
304 | // | |
305 | // Returns a quality measurement of the current seed | |
306 | // | |
307 | ||
29b87567 | 308 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; |
309 | return | |
310 | .5 * TMath::Abs(18.0 - fN2) | |
311 | + 10.* TMath::Abs(fYfit[1] - fYref[1]) | |
312 | + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr) | |
313 | + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength; | |
e4f2f73d | 314 | } |
315 | ||
0906e73e | 316 | //____________________________________________________________________ |
317 | void AliTRDseedV1::GetCovAt(Double_t /*x*/, Double_t *cov) const | |
318 | { | |
319 | // Computes covariance in the y-z plane at radial point x | |
320 | ||
29b87567 | 321 | Int_t ic = 0; while (!fClusters[ic]) ic++; |
eb38ed55 | 322 | AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance(); |
29b87567 | 323 | Double_t exB = fCalib->GetOmegaTau(fCalib->GetVdriftAverage(fClusters[ic]->GetDetector()), -AliTracker::GetBz()*0.1); |
eb38ed55 | 324 | |
29b87567 | 325 | Double_t sy2 = fSigmaY2*fSigmaY2 + .2*(fYfit[1]-exB)*(fYfit[1]-exB); |
326 | Double_t sz2 = fPadLength/12.; | |
0906e73e | 327 | |
eb38ed55 | 328 | |
29b87567 | 329 | //printf("Yfit[1] %f sy20 %f SigmaY2 %f\n", fYfit[1], sy20, fSigmaY2); |
0906e73e | 330 | |
29b87567 | 331 | cov[0] = sy2; |
332 | cov[1] = fTilt*(sy2-sz2); | |
333 | cov[2] = sz2; | |
3a039a31 | 334 | |
335 | // insert systematic uncertainties calibration and misalignment | |
336 | Double_t sys[15]; | |
337 | fReconstructor->GetRecoParam()->GetSysCovMatrix(sys); | |
338 | cov[0] += (sys[0]*sys[0]); | |
339 | cov[2] += (sys[1]*sys[1]); | |
0906e73e | 340 | } |
341 | ||
0906e73e | 342 | |
343 | //____________________________________________________________________ | |
29b87567 | 344 | void AliTRDseedV1::SetOwner() |
0906e73e | 345 | { |
29b87567 | 346 | //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO")); |
347 | ||
348 | if(TestBit(kOwner)) return; | |
349 | for(int ic=0; ic<knTimebins; ic++){ | |
350 | if(!fClusters[ic]) continue; | |
351 | fClusters[ic] = new AliTRDcluster(*fClusters[ic]); | |
352 | } | |
353 | SetBit(kOwner); | |
0906e73e | 354 | } |
355 | ||
e4f2f73d | 356 | //____________________________________________________________________ |
eb38ed55 | 357 | Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c) |
e4f2f73d | 358 | { |
359 | // | |
360 | // Iterative process to register clusters to the seed. | |
361 | // In iteration 0 we try only one pad-row and if quality not | |
362 | // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows) | |
363 | // | |
29b87567 | 364 | // debug level 7 |
365 | // | |
366 | ||
367 | if(!fReconstructor->GetRecoParam() ){ | |
368 | AliError("Seed can not be used without a valid RecoParam."); | |
369 | return kFALSE; | |
370 | } | |
371 | ||
372 | AliTRDchamberTimeBin *layer = 0x0; | |
a8276d32 | 373 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){ |
e8037fda | 374 | AliTRDtrackingChamber ch(*chamber); |
375 | ch.SetOwner(); | |
a8276d32 | 376 | (*AliTRDtrackerV1::DebugStreamer()) << "AttachClustersIter" |
e8037fda | 377 | << "chamber.=" << &ch |
29b87567 | 378 | << "tracklet.=" << this |
29b87567 | 379 | << "\n"; |
380 | } | |
381 | ||
35c24814 | 382 | Float_t tquality; |
29b87567 | 383 | Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); |
384 | Double_t kroadz = fPadLength * .5 + 1.; | |
35c24814 | 385 | |
386 | // initialize configuration parameters | |
387 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
388 | Int_t niter = kZcorr ? 1 : 2; | |
389 | ||
29b87567 | 390 | Double_t yexp, zexp; |
391 | Int_t ncl = 0; | |
35c24814 | 392 | // start seed update |
393 | for (Int_t iter = 0; iter < niter; iter++) { | |
29b87567 | 394 | ncl = 0; |
395 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
396 | if(!(layer = chamber->GetTB(iTime))) continue; | |
397 | if(!Int_t(*layer)) continue; | |
398 | ||
399 | // define searching configuration | |
400 | Double_t dxlayer = layer->GetX() - fX0; | |
401 | if(c){ | |
402 | zexp = c->GetZ(); | |
403 | //Try 2 pad-rows in second iteration | |
404 | if (iter > 0) { | |
405 | zexp = fZref[0] + fZref[1] * dxlayer - zcorr; | |
406 | if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5; | |
407 | if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5; | |
408 | } | |
409 | } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.); | |
35c24814 | 410 | yexp = fYref[0] + fYref[1] * dxlayer - zcorr; |
29b87567 | 411 | |
412 | // Get and register cluster | |
413 | Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz); | |
414 | if (index < 0) continue; | |
415 | AliTRDcluster *cl = (*layer)[index]; | |
35c24814 | 416 | |
29b87567 | 417 | fIndexes[iTime] = layer->GetGlobalIndex(index); |
418 | fClusters[iTime] = cl; | |
419 | fY[iTime] = cl->GetY(); | |
420 | fZ[iTime] = cl->GetZ(); | |
421 | ncl++; | |
422 | } | |
35c24814 | 423 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl)); |
29b87567 | 424 | |
425 | if(ncl>1){ | |
426 | // calculate length of the time bin (calibration aware) | |
427 | Int_t irp = 0; Float_t x[2]; Int_t tb[2]; | |
428 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
429 | if(!fClusters[iTime]) continue; | |
430 | x[irp] = fClusters[iTime]->GetX(); | |
431 | tb[irp] = iTime; | |
432 | irp++; | |
433 | if(irp==2) break; | |
434 | } | |
435 | fdX = (x[1] - x[0]) / (tb[0] - tb[1]); | |
436 | ||
437 | // update X0 from the clusters (calibration/alignment aware) | |
438 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
439 | if(!(layer = chamber->GetTB(iTime))) continue; | |
440 | if(!layer->IsT0()) continue; | |
441 | if(fClusters[iTime]){ | |
442 | fX0 = fClusters[iTime]->GetX(); | |
443 | break; | |
444 | } else { // we have to infere the position of the anode wire from the other clusters | |
445 | for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) { | |
446 | if(!fClusters[jTime]) continue; | |
447 | fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime); | |
448 | } | |
449 | break; | |
450 | } | |
451 | } | |
452 | ||
453 | // update YZ reference point | |
454 | // TODO | |
455 | ||
456 | // update x reference positions (calibration/alignment aware) | |
457 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
458 | if(!fClusters[iTime]) continue; | |
459 | fX[iTime] = fClusters[iTime]->GetX() - fX0; | |
460 | } | |
461 | ||
462 | AliTRDseed::Update(); | |
463 | } | |
35c24814 | 464 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2)); |
29b87567 | 465 | |
466 | if(IsOK()){ | |
467 | tquality = GetQuality(kZcorr); | |
468 | if(tquality < quality) break; | |
469 | else quality = tquality; | |
470 | } | |
471 | kroadz *= 2.; | |
472 | } // Loop: iter | |
473 | if (!IsOK()) return kFALSE; | |
474 | ||
804bb02e | 475 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels(); |
29b87567 | 476 | UpdateUsed(); |
477 | return kTRUE; | |
e4f2f73d | 478 | } |
479 | ||
480 | //____________________________________________________________________ | |
eb38ed55 | 481 | Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber |
29b87567 | 482 | ,Bool_t kZcorr) |
e4f2f73d | 483 | { |
484 | // | |
485 | // Projective algorithm to attach clusters to seeding tracklets | |
486 | // | |
487 | // Parameters | |
488 | // | |
489 | // Output | |
490 | // | |
491 | // Detailed description | |
492 | // 1. Collapse x coordinate for the full detector plane | |
493 | // 2. truncated mean on y (r-phi) direction | |
494 | // 3. purge clusters | |
495 | // 4. truncated mean on z direction | |
496 | // 5. purge clusters | |
497 | // 6. fit tracklet | |
498 | // | |
499 | ||
29b87567 | 500 | if(!fReconstructor->GetRecoParam() ){ |
501 | AliError("Seed can not be used without a valid RecoParam."); | |
502 | return kFALSE; | |
503 | } | |
504 | ||
505 | const Int_t kClusterCandidates = 2 * knTimebins; | |
506 | ||
507 | //define roads | |
508 | Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); | |
509 | Double_t kroadz = fPadLength * 1.5 + 1.; | |
510 | // correction to y for the tilting angle | |
511 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
512 | ||
513 | // working variables | |
514 | AliTRDcluster *clusters[kClusterCandidates]; | |
515 | Double_t cond[4], yexp[knTimebins], zexp[knTimebins], | |
516 | yres[kClusterCandidates], zres[kClusterCandidates]; | |
517 | Int_t ncl, *index = 0x0, tboundary[knTimebins]; | |
518 | ||
519 | // Do cluster projection | |
520 | AliTRDchamberTimeBin *layer = 0x0; | |
521 | Int_t nYclusters = 0; Bool_t kEXIT = kFALSE; | |
522 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
523 | if(!(layer = chamber->GetTB(iTime))) continue; | |
524 | if(!Int_t(*layer)) continue; | |
525 | ||
526 | fX[iTime] = layer->GetX() - fX0; | |
527 | zexp[iTime] = fZref[0] + fZref[1] * fX[iTime]; | |
528 | yexp[iTime] = fYref[0] + fYref[1] * fX[iTime] - zcorr; | |
529 | ||
530 | // build condition and process clusters | |
531 | cond[0] = yexp[iTime] - kroady; cond[1] = yexp[iTime] + kroady; | |
532 | cond[2] = zexp[iTime] - kroadz; cond[3] = zexp[iTime] + kroadz; | |
533 | layer->GetClusters(cond, index, ncl); | |
534 | for(Int_t ic = 0; ic<ncl; ic++){ | |
535 | AliTRDcluster *c = layer->GetCluster(index[ic]); | |
536 | clusters[nYclusters] = c; | |
537 | yres[nYclusters++] = c->GetY() - yexp[iTime]; | |
538 | if(nYclusters >= kClusterCandidates) { | |
539 | AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", kClusterCandidates)); | |
540 | kEXIT = kTRUE; | |
541 | break; | |
542 | } | |
543 | } | |
544 | tboundary[iTime] = nYclusters; | |
545 | if(kEXIT) break; | |
546 | } | |
547 | ||
548 | // Evaluate truncated mean on the y direction | |
549 | Double_t mean, sigma; | |
550 | AliMathBase::EvaluateUni(nYclusters, yres, mean, sigma, Int_t(nYclusters*.8)-2); | |
551 | // purge cluster candidates | |
552 | Int_t nZclusters = 0; | |
553 | for(Int_t ic = 0; ic<nYclusters; ic++){ | |
554 | if(yres[ic] - mean > 4. * sigma){ | |
555 | clusters[ic] = 0x0; | |
556 | continue; | |
557 | } | |
558 | zres[nZclusters++] = clusters[ic]->GetZ() - zexp[clusters[ic]->GetLocalTimeBin()]; | |
559 | } | |
560 | ||
561 | // Evaluate truncated mean on the z direction | |
562 | AliMathBase::EvaluateUni(nZclusters, zres, mean, sigma, Int_t(nZclusters*.8)-2); | |
563 | // purge cluster candidates | |
564 | for(Int_t ic = 0; ic<nZclusters; ic++){ | |
565 | if(zres[ic] - mean > 4. * sigma){ | |
566 | clusters[ic] = 0x0; | |
567 | continue; | |
568 | } | |
569 | } | |
570 | ||
571 | ||
572 | // Select only one cluster/TimeBin | |
573 | Int_t lastCluster = 0; | |
574 | fN2 = 0; | |
575 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
576 | ncl = tboundary[iTime] - lastCluster; | |
577 | if(!ncl) continue; | |
578 | Int_t iptr = lastCluster; | |
579 | if(ncl > 1){ | |
580 | Float_t dold = 9999.; | |
581 | for(int ic=lastCluster; ic<tboundary[iTime]; ic++){ | |
582 | if(!clusters[ic]) continue; | |
583 | Float_t y = yexp[iTime] - clusters[ic]->GetY(); | |
584 | Float_t z = zexp[iTime] - clusters[ic]->GetZ(); | |
585 | Float_t d = y * y + z * z; | |
586 | if(d > dold) continue; | |
587 | dold = d; | |
588 | iptr = ic; | |
589 | } | |
590 | } | |
591 | fIndexes[iTime] = chamber->GetTB(iTime)->GetGlobalIndex(iptr); | |
592 | fClusters[iTime] = clusters[iptr]; | |
593 | fY[iTime] = clusters[iptr]->GetY(); | |
594 | fZ[iTime] = clusters[iptr]->GetZ(); | |
595 | lastCluster = tboundary[iTime]; | |
596 | fN2++; | |
597 | } | |
598 | ||
599 | // number of minimum numbers of clusters expected for the tracklet | |
600 | Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins()); | |
e4f2f73d | 601 | if (fN2 < kClmin){ |
29b87567 | 602 | AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin)); |
e4f2f73d | 603 | fN2 = 0; |
604 | return kFALSE; | |
605 | } | |
0906e73e | 606 | |
29b87567 | 607 | // update used clusters |
608 | fNUsed = 0; | |
609 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
610 | if(!fClusters[iTime]) continue; | |
611 | if((fClusters[iTime]->IsUsed())) fNUsed++; | |
612 | } | |
0906e73e | 613 | |
614 | if (fN2-fNUsed < kClmin){ | |
29b87567 | 615 | AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2)); |
0906e73e | 616 | fN2 = 0; |
617 | return kFALSE; | |
618 | } | |
29b87567 | 619 | |
620 | return kTRUE; | |
e4f2f73d | 621 | } |
622 | ||
03cef9b2 | 623 | //____________________________________________________________ |
624 | void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec) | |
625 | { | |
626 | // Fill in all derived information. It has to be called after recovery from file or HLT. | |
627 | // The primitive data are | |
628 | // - list of clusters | |
629 | // - detector (as the detector will be removed from clusters) | |
630 | // - position of anode wire (fX0) - temporary | |
631 | // - track reference position and direction | |
632 | // - momentum of the track | |
633 | // - time bin length [cm] | |
634 | // | |
635 | // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008 | |
636 | // | |
637 | fReconstructor = rec; | |
638 | AliTRDgeometry g; | |
639 | AliTRDpadPlane *pp = g.GetPadPlane(fDet); | |
640 | fTilt = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); | |
641 | fPadLength = pp->GetLengthIPad(); | |
642 | fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]); | |
643 | fTgl = fZref[1]; | |
644 | fN = 0; fN2 = 0; fMPads = 0.; | |
645 | AliTRDcluster **cit = &fClusters[0]; | |
646 | for(Int_t ic = knTimebins; ic--; cit++){ | |
647 | if(!(*cit)) return; | |
648 | fN++; fN2++; | |
649 | fX[ic] = (*cit)->GetX() - fX0; | |
650 | fY[ic] = (*cit)->GetY(); | |
651 | fZ[ic] = (*cit)->GetZ(); | |
652 | } | |
653 | Update(); // Fit(); | |
654 | CookLabels(); | |
655 | GetProbability(); | |
656 | } | |
657 | ||
658 | ||
e4f2f73d | 659 | //____________________________________________________________________ |
d2b9977a | 660 | Bool_t AliTRDseedV1::Fit(Bool_t tilt) |
e4f2f73d | 661 | { |
662 | // | |
663 | // Linear fit of the tracklet | |
664 | // | |
665 | // Parameters : | |
666 | // | |
667 | // Output : | |
668 | // True if successful | |
669 | // | |
670 | // Detailed description | |
671 | // 2. Check if tracklet crosses pad row boundary | |
672 | // 1. Calculate residuals in the y (r-phi) direction | |
673 | // 3. Do a Least Square Fit to the data | |
674 | // | |
675 | ||
29b87567 | 676 | const Int_t kClmin = 8; |
ae4e8b84 | 677 | const Float_t q0 = 100.; |
678 | const Float_t clSigma0 = 2.E-2; //[cm] | |
679 | const Float_t clSlopeQ = -1.19E-2; //[1/cm] | |
680 | ||
2f7d6ac8 | 681 | // get track direction |
682 | Double_t y0 = fYref[0]; | |
683 | Double_t dydx = fYref[1]; | |
684 | Double_t z0 = fZref[0]; | |
685 | Double_t dzdx = fZref[1]; | |
686 | Double_t yt, zt; | |
ae4e8b84 | 687 | |
29b87567 | 688 | const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins(); |
689 | AliTRDtrackerV1::AliTRDLeastSquare fitterY, fitterZ; | |
690 | ||
691 | // convertion factor from square to gauss distribution for sigma | |
692 | Double_t convert = 1./TMath::Sqrt(12.); | |
ae4e8b84 | 693 | |
29b87567 | 694 | // book cluster information |
2f7d6ac8 | 695 | Double_t xc[knTimebins], yc[knTimebins], zc[knTimebins], sy[knTimebins], sz[knTimebins]; |
29b87567 | 696 | Int_t zRow[knTimebins]; |
2f7d6ac8 | 697 | |
698 | ||
699 | fN = 0; | |
9eb2d46c | 700 | AliTRDcluster *c=0x0, **jc = &fClusters[0]; |
9eb2d46c | 701 | for (Int_t ic=0; ic<kNtb; ic++, ++jc) { |
29b87567 | 702 | zRow[ic] = -1; |
703 | xc[ic] = -1.; | |
704 | yc[ic] = 999.; | |
705 | zc[ic] = 999.; | |
706 | sy[ic] = 0.; | |
707 | sz[ic] = 0.; | |
9eb2d46c | 708 | if(!(c = (*jc))) continue; |
29b87567 | 709 | if(!c->IsInChamber()) continue; |
710 | Float_t w = 1.; | |
711 | if(c->GetNPads()>4) w = .5; | |
712 | if(c->GetNPads()>5) w = .2; | |
2f7d6ac8 | 713 | zRow[fN] = c->GetPadRow(); |
714 | xc[fN] = fX0 - c->GetX(); | |
715 | yc[fN] = c->GetY(); | |
716 | zc[fN] = c->GetZ(); | |
717 | ||
718 | // extrapolated y value for the track | |
719 | yt = y0 - xc[fN]*dydx; | |
720 | // extrapolated z value for the track | |
721 | zt = z0 - xc[fN]*dzdx; | |
722 | // tilt correction | |
723 | if(tilt) yc[fN] -= fTilt*(zc[fN] - zt); | |
724 | ||
725 | // elaborate cluster error | |
ae4e8b84 | 726 | Float_t qr = c->GetQ() - q0; |
2f7d6ac8 | 727 | sy[fN] = qr < 0. ? clSigma0*TMath::Exp(clSlopeQ*qr) : clSigma0; |
728 | ||
729 | fitterY.AddPoint(&xc[fN], yc[fN]-yt, sy[fN]); | |
730 | ||
731 | sz[fN] = fPadLength*convert; | |
732 | fitterZ.AddPoint(&xc[fN], zc[fN], sz[fN]); | |
733 | fN++; | |
29b87567 | 734 | } |
47d5d320 | 735 | // to few clusters |
2f7d6ac8 | 736 | if (fN < kClmin) return kFALSE; |
737 | ||
738 | // fit XY plane | |
739 | fitterY.Eval(); | |
740 | fYfit[0] = y0+fitterY.GetFunctionParameter(0); | |
741 | fYfit[1] = dydx-fitterY.GetFunctionParameter(1); | |
742 | ||
743 | // check par row crossing | |
744 | Int_t zN[2*AliTRDseed::knTimebins]; | |
745 | Int_t nz = AliTRDtrackerV1::Freq(fN, zRow, zN, kFALSE); | |
29b87567 | 746 | // more than one pad row crossing |
747 | if(nz>2) return kFALSE; | |
9eb2d46c | 748 | |
29b87567 | 749 | |
750 | // determine z offset of the fit | |
2f7d6ac8 | 751 | Float_t zslope = 0.; |
29b87567 | 752 | Int_t nchanges = 0, nCross = 0; |
753 | if(nz==2){ // tracklet is crossing pad row | |
754 | // Find the break time allowing one chage on pad-rows | |
755 | // with maximal number of accepted clusters | |
756 | Int_t padRef = zRow[0]; | |
2f7d6ac8 | 757 | for (Int_t ic=1; ic<fN; ic++) { |
29b87567 | 758 | if(zRow[ic] == padRef) continue; |
759 | ||
760 | // debug | |
761 | if(zRow[ic-1] == zRow[ic]){ | |
762 | printf("ERROR in pad row change!!!\n"); | |
763 | } | |
764 | ||
765 | // evaluate parameters of the crossing point | |
766 | Float_t sx = (xc[ic-1] - xc[ic])*convert; | |
2f7d6ac8 | 767 | fCross[0] = .5 * (xc[ic-1] + xc[ic]); |
768 | fCross[2] = .5 * (zc[ic-1] + zc[ic]); | |
769 | fCross[3] = TMath::Max(dzdx * sx, .01); | |
770 | zslope = zc[ic-1] > zc[ic] ? 1. : -1.; | |
771 | padRef = zRow[ic]; | |
772 | nCross = ic; | |
29b87567 | 773 | nchanges++; |
774 | } | |
775 | } | |
776 | ||
777 | // condition on nCross and reset nchanges TODO | |
778 | ||
779 | if(nchanges==1){ | |
2f7d6ac8 | 780 | if(dzdx * zslope < 0.){ |
29b87567 | 781 | AliInfo("tracklet direction does not correspond to the track direction. TODO."); |
782 | } | |
783 | SetBit(kRowCross, kTRUE); // mark pad row crossing | |
2f7d6ac8 | 784 | fitterZ.AddPoint(&fCross[0], fCross[2], fCross[3]); |
29b87567 | 785 | fitterZ.Eval(); |
2f7d6ac8 | 786 | //zc[nc] = fitterZ.GetFunctionParameter(0); |
787 | fCross[1] = fYfit[0] - fCross[0] * fYfit[1]; | |
788 | fCross[0] = fX0 - fCross[0]; | |
29b87567 | 789 | } else if(nchanges > 1){ // debug |
2389e96f | 790 | AliError("N pad row crossing > 1."); |
29b87567 | 791 | return kFALSE; |
792 | } | |
793 | ||
2389e96f | 794 | UpdateUsed(); |
795 | ||
29b87567 | 796 | return kTRUE; |
e4f2f73d | 797 | } |
798 | ||
e4f2f73d | 799 | |
800 | //___________________________________________________________________ | |
203967fc | 801 | void AliTRDseedV1::Print(Option_t *o) const |
e4f2f73d | 802 | { |
803 | // | |
804 | // Printing the seedstatus | |
805 | // | |
806 | ||
203967fc | 807 | AliInfo(Form("Det[%3d] Tilt[%+6.2f] Pad[%5.2f]", fDet, fTilt, fPadLength)); |
808 | AliInfo(Form("Nattach[%2d] Nfit[%2d] Nuse[%2d] pads[%f]", fN, fN2, fNUsed, fMPads)); | |
809 | AliInfo(Form("x[%7.2f] y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fX0, fYfit[0], fZfit[0], fYfit[1], fZfit[1])); | |
810 | AliInfo(Form("Ref y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fYref[0], fZref[0], fYref[1], fZref[1])) | |
811 | ||
812 | ||
813 | if(strcmp(o, "a")!=0) return; | |
814 | ||
4dc4dc2e | 815 | AliTRDcluster* const* jc = &fClusters[0]; |
816 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++, jc++) { | |
817 | if(!(*jc)) continue; | |
203967fc | 818 | (*jc)->Print(o); |
4dc4dc2e | 819 | } |
e4f2f73d | 820 | |
203967fc | 821 | /* printf(" fSigmaY =%f\n", fSigmaY); |
29b87567 | 822 | printf(" fSigmaY2=%f\n", fSigmaY2); |
823 | printf(" fMeanz =%f\n", fMeanz); | |
824 | printf(" fZProb =%f\n", fZProb); | |
203967fc | 825 | printf(" fLabels[0]=%d fLabels[1]=%d\n", fLabels[0], fLabels[1]);*/ |
29b87567 | 826 | |
203967fc | 827 | /* printf(" fC =%f\n", fC); |
29b87567 | 828 | printf(" fCC =%f\n",fCC); |
829 | printf(" fChi2 =%f\n", fChi2); | |
203967fc | 830 | printf(" fChi2Z =%f\n", fChi2Z);*/ |
e4f2f73d | 831 | } |
47d5d320 | 832 | |
203967fc | 833 | |
834 | //___________________________________________________________________ | |
835 | Bool_t AliTRDseedV1::IsEqual(const TObject *o) const | |
836 | { | |
837 | // Checks if current instance of the class has the same essential members | |
838 | // as the given one | |
839 | ||
840 | if(!o) return kFALSE; | |
841 | const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o); | |
842 | if(!inTracklet) return kFALSE; | |
843 | ||
844 | for (Int_t i = 0; i < 2; i++){ | |
845 | if ( fYref[i] != inTracklet->GetYref(i) ) return kFALSE; | |
846 | if ( fZref[i] != inTracklet->GetZref(i) ) return kFALSE; | |
847 | } | |
848 | ||
849 | if ( fSigmaY != inTracklet->GetSigmaY() ) return kFALSE; | |
850 | if ( fSigmaY2 != inTracklet->GetSigmaY2() ) return kFALSE; | |
851 | if ( fTilt != inTracklet->GetTilt() ) return kFALSE; | |
852 | if ( fPadLength != inTracklet->GetPadLength() ) return kFALSE; | |
853 | ||
854 | for (Int_t i = 0; i < knTimebins; i++){ | |
855 | if ( fX[i] != inTracklet->GetX(i) ) return kFALSE; | |
856 | if ( fY[i] != inTracklet->GetY(i) ) return kFALSE; | |
857 | if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE; | |
858 | if ( fIndexes[i] != inTracklet->GetIndexes(i) ) return kFALSE; | |
859 | if ( fUsable[i] != inTracklet->IsUsable(i) ) return kFALSE; | |
860 | } | |
861 | ||
862 | for (Int_t i=0; i < 2; i++){ | |
863 | if ( fYfit[i] != inTracklet->GetYfit(i) ) return kFALSE; | |
864 | if ( fZfit[i] != inTracklet->GetZfit(i) ) return kFALSE; | |
865 | if ( fYfitR[i] != inTracklet->GetYfitR(i) ) return kFALSE; | |
866 | if ( fZfitR[i] != inTracklet->GetZfitR(i) ) return kFALSE; | |
867 | if ( fLabels[i] != inTracklet->GetLabels(i) ) return kFALSE; | |
868 | } | |
869 | ||
870 | if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE; | |
871 | if ( fZProb != inTracklet->GetZProb() ) return kFALSE; | |
872 | if ( fN2 != inTracklet->GetN2() ) return kFALSE; | |
873 | if ( fNUsed != inTracklet->GetNUsed() ) return kFALSE; | |
874 | if ( fFreq != inTracklet->GetFreq() ) return kFALSE; | |
875 | if ( fNChange != inTracklet->GetNChange() ) return kFALSE; | |
876 | if ( fNChange != inTracklet->GetNChange() ) return kFALSE; | |
877 | ||
878 | if ( fC != inTracklet->GetC() ) return kFALSE; | |
879 | if ( fCC != inTracklet->GetCC() ) return kFALSE; | |
880 | if ( fChi2 != inTracklet->GetChi2() ) return kFALSE; | |
881 | // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE; | |
882 | ||
883 | if ( fDet != inTracklet->GetDetector() ) return kFALSE; | |
884 | if ( fMom != inTracklet->GetMomentum() ) return kFALSE; | |
885 | if ( fdX != inTracklet->GetdX() ) return kFALSE; | |
886 | ||
887 | for (Int_t iCluster = 0; iCluster < knTimebins; iCluster++){ | |
888 | AliTRDcluster *curCluster = fClusters[iCluster]; | |
889 | AliTRDcluster *inCluster = inTracklet->GetClusters(iCluster); | |
890 | if (curCluster && inCluster){ | |
891 | if (! curCluster->IsEqual(inCluster) ) { | |
892 | curCluster->Print(); | |
893 | inCluster->Print(); | |
894 | return kFALSE; | |
895 | } | |
896 | } else { | |
897 | // if one cluster exists, and corresponding | |
898 | // in other tracklet doesn't - return kFALSE | |
899 | if(curCluster || inCluster) return kFALSE; | |
900 | } | |
901 | } | |
902 | return kTRUE; | |
903 | } |