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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" | |
d937ad7a | 35 | #include "AliCDBManager.h" |
36 | #include "AliTracker.h" | |
e4f2f73d | 37 | |
03cef9b2 | 38 | #include "AliTRDpadPlane.h" |
e4f2f73d | 39 | #include "AliTRDcluster.h" |
f3d3af1b | 40 | #include "AliTRDseedV1.h" |
41 | #include "AliTRDtrackV1.h" | |
e4f2f73d | 42 | #include "AliTRDcalibDB.h" |
eb38ed55 | 43 | #include "AliTRDchamberTimeBin.h" |
44 | #include "AliTRDtrackingChamber.h" | |
45 | #include "AliTRDtrackerV1.h" | |
46 | #include "AliTRDReconstructor.h" | |
e4f2f73d | 47 | #include "AliTRDrecoParam.h" |
d937ad7a | 48 | |
0906e73e | 49 | #include "Cal/AliTRDCalPID.h" |
d937ad7a | 50 | #include "Cal/AliTRDCalROC.h" |
51 | #include "Cal/AliTRDCalDet.h" | |
e4f2f73d | 52 | |
e4f2f73d | 53 | ClassImp(AliTRDseedV1) |
54 | ||
55 | //____________________________________________________________________ | |
ae4e8b84 | 56 | AliTRDseedV1::AliTRDseedV1(Int_t det) |
e4f2f73d | 57 | :AliTRDseed() |
3a039a31 | 58 | ,fReconstructor(0x0) |
ae4e8b84 | 59 | ,fClusterIter(0x0) |
60 | ,fClusterIdx(0) | |
61 | ,fDet(det) | |
0906e73e | 62 | ,fMom(0.) |
bcb6fb78 | 63 | ,fSnp(0.) |
64 | ,fTgl(0.) | |
65 | ,fdX(0.) | |
6e4d4425 | 66 | ,fXref(0.) |
d937ad7a | 67 | ,fExB(0.) |
e4f2f73d | 68 | { |
69 | // | |
70 | // Constructor | |
71 | // | |
29b87567 | 72 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = 0.; |
73 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = -1.; | |
6e4d4425 | 74 | fRefCov[0] = 1.; fRefCov[1] = 0.; fRefCov[2] = 1.; |
d937ad7a | 75 | // covariance matrix [diagonal] |
76 | // default sy = 200um and sz = 2.3 cm | |
77 | fCov[0] = 4.e-4; fCov[1] = 0.; fCov[2] = 5.3; | |
e4f2f73d | 78 | } |
79 | ||
80 | //____________________________________________________________________ | |
0906e73e | 81 | AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &ref) |
e4f2f73d | 82 | :AliTRDseed((AliTRDseed&)ref) |
43d6ad34 | 83 | ,fReconstructor(ref.fReconstructor) |
ae4e8b84 | 84 | ,fClusterIter(0x0) |
85 | ,fClusterIdx(0) | |
86 | ,fDet(ref.fDet) | |
0906e73e | 87 | ,fMom(ref.fMom) |
bcb6fb78 | 88 | ,fSnp(ref.fSnp) |
89 | ,fTgl(ref.fTgl) | |
90 | ,fdX(ref.fdX) | |
6e4d4425 | 91 | ,fXref(ref.fXref) |
d937ad7a | 92 | ,fExB(ref.fExB) |
e4f2f73d | 93 | { |
94 | // | |
95 | // Copy Constructor performing a deep copy | |
96 | // | |
97 | ||
29b87567 | 98 | //printf("AliTRDseedV1::AliTRDseedV1(const AliTRDseedV1 &)\n"); |
99 | SetBit(kOwner, kFALSE); | |
100 | for(int islice=0; islice < knSlices; islice++) fdEdx[islice] = ref.fdEdx[islice]; | |
101 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) fProb[ispec] = ref.fProb[ispec]; | |
6e4d4425 | 102 | memcpy(fRefCov, ref.fRefCov, 3*sizeof(Double_t)); |
d937ad7a | 103 | memcpy(fCov, ref.fCov, 3*sizeof(Double_t)); |
fbb2ea06 | 104 | } |
d9950a5a | 105 | |
0906e73e | 106 | |
e4f2f73d | 107 | //____________________________________________________________________ |
108 | AliTRDseedV1& AliTRDseedV1::operator=(const AliTRDseedV1 &ref) | |
109 | { | |
110 | // | |
111 | // Assignment Operator using the copy function | |
112 | // | |
113 | ||
29b87567 | 114 | if(this != &ref){ |
115 | ref.Copy(*this); | |
116 | } | |
221ab7e0 | 117 | SetBit(kOwner, kFALSE); |
118 | ||
29b87567 | 119 | return *this; |
e4f2f73d | 120 | |
121 | } | |
122 | ||
123 | //____________________________________________________________________ | |
124 | AliTRDseedV1::~AliTRDseedV1() | |
125 | { | |
126 | // | |
127 | // Destructor. The RecoParam object belongs to the underlying tracker. | |
128 | // | |
129 | ||
29b87567 | 130 | //printf("I-AliTRDseedV1::~AliTRDseedV1() : Owner[%s]\n", IsOwner()?"YES":"NO"); |
e4f2f73d | 131 | |
29b87567 | 132 | if(IsOwner()) |
133 | for(int itb=0; itb<knTimebins; itb++){ | |
134 | if(!fClusters[itb]) continue; | |
135 | //AliInfo(Form("deleting c %p @ %d", fClusters[itb], itb)); | |
136 | delete fClusters[itb]; | |
137 | fClusters[itb] = 0x0; | |
138 | } | |
e4f2f73d | 139 | } |
140 | ||
141 | //____________________________________________________________________ | |
142 | void AliTRDseedV1::Copy(TObject &ref) const | |
143 | { | |
144 | // | |
145 | // Copy function | |
146 | // | |
147 | ||
29b87567 | 148 | //AliInfo(""); |
149 | AliTRDseedV1 &target = (AliTRDseedV1 &)ref; | |
150 | ||
ae4e8b84 | 151 | target.fClusterIter = 0x0; |
152 | target.fClusterIdx = 0; | |
153 | target.fDet = fDet; | |
29b87567 | 154 | target.fMom = fMom; |
155 | target.fSnp = fSnp; | |
156 | target.fTgl = fTgl; | |
157 | target.fdX = fdX; | |
6e4d4425 | 158 | target.fXref = fXref; |
d937ad7a | 159 | target.fExB = fExB; |
29b87567 | 160 | target.fReconstructor = fReconstructor; |
161 | ||
162 | for(int islice=0; islice < knSlices; islice++) target.fdEdx[islice] = fdEdx[islice]; | |
163 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) target.fProb[ispec] = fProb[ispec]; | |
6e4d4425 | 164 | memcpy(target.fRefCov, fRefCov, 3*sizeof(Double_t)); |
d937ad7a | 165 | memcpy(target.fCov, fCov, 3*sizeof(Double_t)); |
29b87567 | 166 | |
167 | AliTRDseed::Copy(target); | |
e4f2f73d | 168 | } |
169 | ||
0906e73e | 170 | |
171 | //____________________________________________________________ | |
f3d3af1b | 172 | Bool_t AliTRDseedV1::Init(AliTRDtrackV1 *track) |
0906e73e | 173 | { |
174 | // Initialize this tracklet using the track information | |
175 | // | |
176 | // Parameters: | |
177 | // track - the TRD track used to initialize the tracklet | |
178 | // | |
179 | // Detailed description | |
180 | // The function sets the starting point and direction of the | |
181 | // tracklet according to the information from the TRD track. | |
182 | // | |
183 | // Caution | |
184 | // The TRD track has to be propagated to the beginning of the | |
185 | // chamber where the tracklet will be constructed | |
186 | // | |
187 | ||
29b87567 | 188 | Double_t y, z; |
189 | if(!track->GetProlongation(fX0, y, z)) return kFALSE; | |
b1957d3c | 190 | UpDate(track); |
29b87567 | 191 | return kTRUE; |
0906e73e | 192 | } |
193 | ||
bcb6fb78 | 194 | |
b1957d3c | 195 | //____________________________________________________________________ |
196 | void AliTRDseedV1::UpDate(const AliTRDtrackV1 *trk) | |
197 | { | |
198 | // update tracklet reference position from the TRD track | |
199 | // Funny name to avoid the clash with the function AliTRDseed::Update() (has to be made obselete) | |
200 | ||
201 | fSnp = trk->GetSnp(); | |
202 | fTgl = trk->GetTgl(); | |
203 | fMom = trk->GetP(); | |
204 | fYref[1] = fSnp/(1. - fSnp*fSnp); | |
205 | fZref[1] = fTgl; | |
206 | SetCovRef(trk->GetCovariance()); | |
207 | ||
208 | Double_t dx = trk->GetX() - fX0; | |
209 | fYref[0] = trk->GetY() - dx*fYref[1]; | |
210 | fZref[0] = trk->GetZ() - dx*fZref[1]; | |
211 | } | |
212 | ||
bcb6fb78 | 213 | //____________________________________________________________________ |
214 | void AliTRDseedV1::CookdEdx(Int_t nslices) | |
215 | { | |
216 | // Calculates average dE/dx for all slices and store them in the internal array fdEdx. | |
217 | // | |
218 | // Parameters: | |
219 | // nslices : number of slices for which dE/dx should be calculated | |
220 | // Output: | |
221 | // store results in the internal array fdEdx. This can be accessed with the method | |
222 | // AliTRDseedV1::GetdEdx() | |
223 | // | |
224 | // Detailed description | |
225 | // Calculates average dE/dx for all slices. Depending on the PID methode | |
226 | // the number of slices can be 3 (LQ) or 8(NN). | |
3ee48d6e | 227 | // The calculation of dQ/dl are done using the tracklet fit results (see AliTRDseedV1::GetdQdl(Int_t)) |
bcb6fb78 | 228 | // |
229 | // The following effects are included in the calculation: | |
230 | // 1. calibration values for t0 and vdrift (using x coordinate to calculate slice) | |
231 | // 2. cluster sharing (optional see AliTRDrecoParam::SetClusterSharing()) | |
232 | // 3. cluster size | |
233 | // | |
234 | ||
29b87567 | 235 | Int_t nclusters[knSlices]; |
236 | for(int i=0; i<knSlices; i++){ | |
237 | fdEdx[i] = 0.; | |
238 | nclusters[i] = 0; | |
239 | } | |
3ee48d6e | 240 | Float_t pathLength = (.5 * AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); |
29b87567 | 241 | |
3ee48d6e | 242 | AliTRDcluster *c = 0x0; |
29b87567 | 243 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++){ |
8e709c82 | 244 | if(!(c = fClusters[ic]) && !(c = fClusters[ic+kNtb])) continue; |
3ee48d6e | 245 | Float_t x = c->GetX(); |
29b87567 | 246 | |
247 | // Filter clusters for dE/dx calculation | |
248 | ||
249 | // 1.consider calibration effects for slice determination | |
250 | Int_t slice; | |
3ee48d6e | 251 | if(c->IsInChamber()) slice = Int_t(TMath::Abs(fX0 - x) * nslices / pathLength); |
29b87567 | 252 | else slice = x < fX0 ? 0 : nslices-1; |
253 | ||
254 | // 2. take sharing into account | |
3ee48d6e | 255 | Float_t w = c->IsShared() ? .5 : 1.; |
29b87567 | 256 | |
257 | // 3. take into account large clusters TODO | |
258 | //w *= c->GetNPads() > 3 ? .8 : 1.; | |
259 | ||
260 | //CHECK !!! | |
261 | fdEdx[slice] += w * GetdQdl(ic); //fdQdl[ic]; | |
262 | nclusters[slice]++; | |
263 | } // End of loop over clusters | |
264 | ||
cd40b287 | 265 | //if(fReconstructor->GetPIDMethod() == AliTRDReconstructor::kLQPID){ |
0d83b3a5 | 266 | if(nslices == AliTRDpidUtil::kLQslices){ |
29b87567 | 267 | // calculate mean charge per slice (only LQ PID) |
268 | for(int is=0; is<nslices; is++){ | |
269 | if(nclusters[is]) fdEdx[is] /= nclusters[is]; | |
270 | } | |
271 | } | |
bcb6fb78 | 272 | } |
273 | ||
d937ad7a | 274 | //____________________________________________________________________ |
275 | void AliTRDseedV1::GetClusterXY(const AliTRDcluster *c, Double_t &x, Double_t &y) | |
276 | { | |
277 | // Return corrected position of the cluster taking into | |
278 | // account variation of the drift velocity with drift length. | |
279 | ||
280 | ||
281 | // drift velocity correction TODO to be moved to the clusterizer | |
282 | const Float_t cx[] = { | |
283 | -9.6280e-02, 1.3091e-01,-1.7415e-02,-9.9221e-02,-1.2040e-01,-9.5493e-02, | |
284 | -5.0041e-02,-1.6726e-02, 3.5756e-03, 1.8611e-02, 2.6378e-02, 3.3823e-02, | |
285 | 3.4811e-02, 3.5282e-02, 3.5386e-02, 3.6047e-02, 3.5201e-02, 3.4384e-02, | |
286 | 3.2864e-02, 3.1932e-02, 3.2051e-02, 2.2539e-02,-2.5154e-02,-1.2050e-01, | |
287 | -1.2050e-01 | |
288 | }; | |
289 | ||
290 | // PRF correction TODO to be replaced by the gaussian | |
291 | // approximation with full error parametrization and // moved to the clusterizer | |
292 | const Float_t cy[AliTRDgeometry::kNlayer][3] = { | |
293 | { 4.014e-04, 8.605e-03, -6.880e+00}, | |
294 | {-3.061e-04, 9.663e-03, -6.789e+00}, | |
295 | { 1.124e-03, 1.105e-02, -6.825e+00}, | |
296 | {-1.527e-03, 1.231e-02, -6.777e+00}, | |
297 | { 2.150e-03, 1.387e-02, -6.783e+00}, | |
298 | {-1.296e-03, 1.486e-02, -6.825e+00} | |
299 | }; | |
300 | ||
301 | Int_t ily = AliTRDgeometry::GetLayer(c->GetDetector()); | |
302 | x = c->GetX() - cx[c->GetLocalTimeBin()]; | |
303 | y = c->GetY() + cy[ily][0] + cy[ily][1] * TMath::Sin(cy[ily][2] * c->GetCenter()); | |
304 | return; | |
305 | } | |
b83573da | 306 | |
bcb6fb78 | 307 | //____________________________________________________________________ |
308 | Float_t AliTRDseedV1::GetdQdl(Int_t ic) const | |
309 | { | |
3ee48d6e | 310 | // Using the linear approximation of the track inside one TRD chamber (TRD tracklet) |
311 | // the charge per unit length can be written as: | |
312 | // BEGIN_LATEX | |
313 | // #frac{dq}{dl} = #frac{q_{c}}{dx * #sqrt{1 + #(){#frac{dy}{dx}}^{2}_{fit} + #(){#frac{dy}{dx}}^{2}_{ref}}} | |
314 | // END_LATEX | |
315 | // where qc is the total charge collected in the current time bin and dx is the length | |
316 | // of the time bin. For the moment (Jan 20 2009) only pad row cross corrections are | |
317 | // considered for the charge but none are applied for drift velocity variations along | |
318 | // the drift region or assymetry of the TRF | |
319 | // | |
320 | // Author : Alex Bercuci <A.Bercuci@gsi.de> | |
321 | // | |
322 | Float_t dq = 0.; | |
323 | if(fClusters[ic]) dq += TMath::Abs(fClusters[ic]->GetQ()); | |
8e709c82 | 324 | if(fClusters[ic+kNtb]) dq += TMath::Abs(fClusters[ic+kNtb]->GetQ()); |
325 | if(dq<1.e-3 || fdX < 1.e-3) return 0.; | |
3ee48d6e | 326 | |
327 | return dq/fdX/TMath::Sqrt(1. + fYfit[1]*fYfit[1] + fZref[1]*fZref[1]); | |
bcb6fb78 | 328 | } |
329 | ||
0906e73e | 330 | //____________________________________________________________________ |
331 | Double_t* AliTRDseedV1::GetProbability() | |
332 | { | |
333 | // Fill probability array for tracklet from the DB. | |
334 | // | |
335 | // Parameters | |
336 | // | |
337 | // Output | |
338 | // returns pointer to the probability array and 0x0 if missing DB access | |
339 | // | |
340 | // Detailed description | |
341 | ||
29b87567 | 342 | |
343 | // retrive calibration db | |
0906e73e | 344 | AliTRDcalibDB *calibration = AliTRDcalibDB::Instance(); |
345 | if (!calibration) { | |
346 | AliError("No access to calibration data"); | |
347 | return 0x0; | |
348 | } | |
349 | ||
3a039a31 | 350 | if (!fReconstructor) { |
351 | AliError("Reconstructor not set."); | |
4ba1d6ae | 352 | return 0x0; |
353 | } | |
354 | ||
0906e73e | 355 | // Retrieve the CDB container class with the parametric detector response |
3a039a31 | 356 | const AliTRDCalPID *pd = calibration->GetPIDObject(fReconstructor->GetPIDMethod()); |
0906e73e | 357 | if (!pd) { |
358 | AliError("No access to AliTRDCalPID object"); | |
359 | return 0x0; | |
360 | } | |
29b87567 | 361 | //AliInfo(Form("Method[%d] : %s", fReconstructor->GetRecoParam() ->GetPIDMethod(), pd->IsA()->GetName())); |
10f75631 | 362 | |
29b87567 | 363 | // calculate tracklet length TO DO |
0906e73e | 364 | Float_t length = (AliTRDgeometry::AmThick() + AliTRDgeometry::DrThick()); |
365 | /// TMath::Sqrt((1.0 - fSnp[iPlane]*fSnp[iPlane]) / (1.0 + fTgl[iPlane]*fTgl[iPlane])); | |
366 | ||
367 | //calculate dE/dx | |
3a039a31 | 368 | CookdEdx(fReconstructor->GetNdEdxSlices()); |
0906e73e | 369 | |
370 | // Sets the a priori probabilities | |
371 | for(int ispec=0; ispec<AliPID::kSPECIES; ispec++) { | |
ae4e8b84 | 372 | fProb[ispec] = pd->GetProbability(ispec, fMom, &fdEdx[0], length, GetPlane()); |
0906e73e | 373 | } |
374 | ||
29b87567 | 375 | return &fProb[0]; |
0906e73e | 376 | } |
377 | ||
e4f2f73d | 378 | //____________________________________________________________________ |
379 | Float_t AliTRDseedV1::GetQuality(Bool_t kZcorr) const | |
380 | { | |
381 | // | |
382 | // Returns a quality measurement of the current seed | |
383 | // | |
384 | ||
29b87567 | 385 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; |
386 | return | |
387 | .5 * TMath::Abs(18.0 - fN2) | |
388 | + 10.* TMath::Abs(fYfit[1] - fYref[1]) | |
389 | + 5. * TMath::Abs(fYfit[0] - fYref[0] + zcorr) | |
390 | + 2. * TMath::Abs(fMeanz - fZref[0]) / fPadLength; | |
e4f2f73d | 391 | } |
392 | ||
0906e73e | 393 | //____________________________________________________________________ |
d937ad7a | 394 | void AliTRDseedV1::GetCovAt(Double_t x, Double_t *cov) const |
0906e73e | 395 | { |
d937ad7a | 396 | // Computes covariance in the y-z plane at radial point x (in tracking coordinates) |
397 | // and returns the results in the preallocated array cov[3] as : | |
398 | // cov[0] = Var(y) | |
399 | // cov[1] = Cov(yz) | |
400 | // cov[2] = Var(z) | |
401 | // | |
402 | // Details | |
403 | // | |
404 | // For the linear transformation | |
405 | // BEGIN_LATEX | |
406 | // Y = T_{x} X^{T} | |
407 | // END_LATEX | |
408 | // The error propagation has the general form | |
409 | // BEGIN_LATEX | |
410 | // C_{Y} = T_{x} C_{X} T_{x}^{T} | |
411 | // END_LATEX | |
412 | // We apply this formula 2 times. First to calculate the covariance of the tracklet | |
413 | // at point x we consider: | |
414 | // BEGIN_LATEX | |
415 | // T_{x} = (1 x); X=(y0 dy/dx); C_{X}=#(){#splitline{Var(y0) Cov(y0, dy/dx)}{Cov(y0, dy/dx) Var(dy/dx)}} | |
416 | // END_LATEX | |
417 | // and secondly to take into account the tilt angle | |
418 | // BEGIN_LATEX | |
419 | // T_{#alpha} = #(){#splitline{cos(#alpha) __ sin(#alpha)}{-sin(#alpha) __ cos(#alpha)}}; X=(y z); C_{X}=#(){#splitline{Var(y) 0}{0 Var(z)}} | |
420 | // END_LATEX | |
421 | // | |
422 | // using simple trigonometrics one can write for this last case | |
423 | // BEGIN_LATEX | |
424 | // C_{Y}=#frac{1}{1+tg^{2}#alpha} #(){#splitline{(#sigma_{y}^{2}+tg^{2}#alpha#sigma_{z}^{2}) __ tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2})}{tg#alpha(#sigma_{z}^{2}-#sigma_{y}^{2}) __ (#sigma_{z}^{2}+tg^{2}#alpha#sigma_{y}^{2})}} | |
425 | // END_LATEX | |
426 | // which can be aproximated for small alphas (2 deg) with | |
427 | // BEGIN_LATEX | |
428 | // C_{Y}=#(){#splitline{#sigma_{y}^{2} __ (#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha}{((#sigma_{z}^{2}-#sigma_{y}^{2})tg#alpha __ #sigma_{z}^{2}}} | |
429 | // END_LATEX | |
430 | // | |
431 | // before applying the tilt rotation we also apply systematic uncertainties to the tracklet | |
432 | // position which can be tunned from outside via the AliTRDrecoParam::SetSysCovMatrix(). They might | |
433 | // account for extra misalignment/miscalibration uncertainties. | |
434 | // | |
435 | // Author : | |
436 | // Alex Bercuci <A.Bercuci@gsi.de> | |
437 | // Date : Jan 8th 2009 | |
438 | // | |
b1957d3c | 439 | |
440 | ||
d937ad7a | 441 | Double_t xr = fX0-x; |
442 | Double_t sy2 = fCov[0] +2.*xr*fCov[1] + xr*xr*fCov[2]; | |
443 | Double_t sz2 = fPadLength*fPadLength/12.; | |
0906e73e | 444 | |
d937ad7a | 445 | // insert systematic uncertainties |
446 | Double_t sys[15]; | |
447 | fReconstructor->GetRecoParam()->GetSysCovMatrix(sys); | |
448 | sy2 += sys[0]; | |
449 | sz2 += sys[1]; | |
450 | ||
451 | // rotate covariance matrix | |
452 | Double_t t2 = fTilt*fTilt; | |
453 | Double_t correction = 1./(1. + t2); | |
454 | cov[0] = (sy2+t2*sz2)*correction; | |
455 | cov[1] = fTilt*(sz2 - sy2)*correction; | |
456 | cov[2] = (t2*sy2+sz2)*correction; | |
457 | } | |
eb38ed55 | 458 | |
0906e73e | 459 | |
d937ad7a | 460 | //____________________________________________________________________ |
461 | void AliTRDseedV1::SetExB() | |
462 | { | |
463 | // Retrive the tg(a_L) from OCDB. The following information are used | |
464 | // - detector index | |
465 | // - column and row position of first attached cluster. | |
466 | // | |
467 | // If no clusters are attached to the tracklet a random central chamber | |
468 | // position (c=70, r=7) will be used to retrieve the drift velocity. | |
469 | // | |
470 | // Author : | |
471 | // Alex Bercuci <A.Bercuci@gsi.de> | |
472 | // Date : Jan 8th 2009 | |
473 | // | |
eb38ed55 | 474 | |
d937ad7a | 475 | AliCDBManager *cdb = AliCDBManager::Instance(); |
476 | if(cdb->GetRun() < 0){ | |
477 | AliError("OCDB manager not properly initialized"); | |
478 | return; | |
479 | } | |
0906e73e | 480 | |
d937ad7a | 481 | AliTRDcalibDB *fCalib = AliTRDcalibDB::Instance(); |
482 | AliTRDCalROC *fCalVdriftROC = fCalib->GetVdriftROC(fDet); | |
483 | const AliTRDCalDet *fCalVdriftDet = fCalib->GetVdriftDet(); | |
484 | ||
485 | Int_t col = 70, row = 7; | |
486 | AliTRDcluster **c = &fClusters[0]; | |
487 | if(fN){ | |
488 | Int_t ic = 0; | |
489 | while (ic<AliTRDseed::knTimebins && !(*c)){ic++; c++;} | |
490 | if(*c){ | |
491 | col = (*c)->GetPadCol(); | |
492 | row = (*c)->GetPadRow(); | |
493 | } | |
494 | } | |
3a039a31 | 495 | |
d937ad7a | 496 | Double_t vd = fCalVdriftDet->GetValue(fDet) * fCalVdriftROC->GetValue(col, row); |
497 | fExB = fCalib->GetOmegaTau(vd, -0.1*AliTracker::GetBz()); | |
0906e73e | 498 | } |
499 | ||
0906e73e | 500 | //____________________________________________________________________ |
29b87567 | 501 | void AliTRDseedV1::SetOwner() |
0906e73e | 502 | { |
29b87567 | 503 | //AliInfo(Form("own [%s] fOwner[%s]", own?"YES":"NO", fOwner?"YES":"NO")); |
504 | ||
505 | if(TestBit(kOwner)) return; | |
506 | for(int ic=0; ic<knTimebins; ic++){ | |
507 | if(!fClusters[ic]) continue; | |
508 | fClusters[ic] = new AliTRDcluster(*fClusters[ic]); | |
509 | } | |
510 | SetBit(kOwner); | |
0906e73e | 511 | } |
512 | ||
e4f2f73d | 513 | //____________________________________________________________________ |
eb38ed55 | 514 | Bool_t AliTRDseedV1::AttachClustersIter(AliTRDtrackingChamber *chamber, Float_t quality, Bool_t kZcorr, AliTRDcluster *c) |
e4f2f73d | 515 | { |
516 | // | |
517 | // Iterative process to register clusters to the seed. | |
518 | // In iteration 0 we try only one pad-row and if quality not | |
519 | // sufficient we try 2 pad-rows (about 5% of tracks cross 2 pad-rows) | |
520 | // | |
29b87567 | 521 | // debug level 7 |
522 | // | |
523 | ||
524 | if(!fReconstructor->GetRecoParam() ){ | |
525 | AliError("Seed can not be used without a valid RecoParam."); | |
526 | return kFALSE; | |
527 | } | |
528 | ||
529 | AliTRDchamberTimeBin *layer = 0x0; | |
a8276d32 | 530 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7){ |
e8037fda | 531 | AliTRDtrackingChamber ch(*chamber); |
532 | ch.SetOwner(); | |
29f95561 | 533 | TTreeSRedirector &cstreamer = *fReconstructor->GetDebugStream(AliTRDReconstructor::kTracker); |
534 | cstreamer << "AttachClustersIter" | |
e8037fda | 535 | << "chamber.=" << &ch |
29b87567 | 536 | << "tracklet.=" << this |
29b87567 | 537 | << "\n"; |
538 | } | |
539 | ||
35c24814 | 540 | Float_t tquality; |
29b87567 | 541 | Double_t kroady = fReconstructor->GetRecoParam() ->GetRoad1y(); |
542 | Double_t kroadz = fPadLength * .5 + 1.; | |
35c24814 | 543 | |
544 | // initialize configuration parameters | |
545 | Float_t zcorr = kZcorr ? fTilt * (fZProb - fZref[0]) : 0.; | |
546 | Int_t niter = kZcorr ? 1 : 2; | |
547 | ||
29b87567 | 548 | Double_t yexp, zexp; |
549 | Int_t ncl = 0; | |
35c24814 | 550 | // start seed update |
551 | for (Int_t iter = 0; iter < niter; iter++) { | |
29b87567 | 552 | ncl = 0; |
553 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
554 | if(!(layer = chamber->GetTB(iTime))) continue; | |
555 | if(!Int_t(*layer)) continue; | |
556 | ||
557 | // define searching configuration | |
558 | Double_t dxlayer = layer->GetX() - fX0; | |
559 | if(c){ | |
560 | zexp = c->GetZ(); | |
561 | //Try 2 pad-rows in second iteration | |
562 | if (iter > 0) { | |
563 | zexp = fZref[0] + fZref[1] * dxlayer - zcorr; | |
564 | if (zexp > c->GetZ()) zexp = c->GetZ() + fPadLength*0.5; | |
565 | if (zexp < c->GetZ()) zexp = c->GetZ() - fPadLength*0.5; | |
566 | } | |
567 | } else zexp = fZref[0] + (kZcorr ? fZref[1] * dxlayer : 0.); | |
35c24814 | 568 | yexp = fYref[0] + fYref[1] * dxlayer - zcorr; |
29b87567 | 569 | |
570 | // Get and register cluster | |
571 | Int_t index = layer->SearchNearestCluster(yexp, zexp, kroady, kroadz); | |
572 | if (index < 0) continue; | |
573 | AliTRDcluster *cl = (*layer)[index]; | |
35c24814 | 574 | |
29b87567 | 575 | fIndexes[iTime] = layer->GetGlobalIndex(index); |
576 | fClusters[iTime] = cl; | |
577 | fY[iTime] = cl->GetY(); | |
578 | fZ[iTime] = cl->GetZ(); | |
579 | ncl++; | |
580 | } | |
35c24814 | 581 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d ncl [%d] = %d", iter, fDet, ncl)); |
29b87567 | 582 | |
583 | if(ncl>1){ | |
584 | // calculate length of the time bin (calibration aware) | |
585 | Int_t irp = 0; Float_t x[2]; Int_t tb[2]; | |
586 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
587 | if(!fClusters[iTime]) continue; | |
588 | x[irp] = fClusters[iTime]->GetX(); | |
589 | tb[irp] = iTime; | |
590 | irp++; | |
591 | if(irp==2) break; | |
592 | } | |
593 | fdX = (x[1] - x[0]) / (tb[0] - tb[1]); | |
594 | ||
595 | // update X0 from the clusters (calibration/alignment aware) | |
596 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
597 | if(!(layer = chamber->GetTB(iTime))) continue; | |
598 | if(!layer->IsT0()) continue; | |
599 | if(fClusters[iTime]){ | |
600 | fX0 = fClusters[iTime]->GetX(); | |
601 | break; | |
602 | } else { // we have to infere the position of the anode wire from the other clusters | |
603 | for (Int_t jTime = iTime+1; jTime < AliTRDtrackerV1::GetNTimeBins(); jTime++) { | |
604 | if(!fClusters[jTime]) continue; | |
605 | fX0 = fClusters[jTime]->GetX() + fdX * (jTime - iTime); | |
f660dce9 | 606 | break; |
29b87567 | 607 | } |
29b87567 | 608 | } |
609 | } | |
610 | ||
611 | // update YZ reference point | |
612 | // TODO | |
613 | ||
614 | // update x reference positions (calibration/alignment aware) | |
615 | for (Int_t iTime = 0; iTime < AliTRDtrackerV1::GetNTimeBins(); iTime++) { | |
616 | if(!fClusters[iTime]) continue; | |
0849f128 | 617 | fX[iTime] = fX0 - fClusters[iTime]->GetX(); |
29b87567 | 618 | } |
619 | ||
620 | AliTRDseed::Update(); | |
621 | } | |
35c24814 | 622 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=7) AliInfo(Form("iter = %d nclFit [%d] = %d", iter, fDet, fN2)); |
29b87567 | 623 | |
624 | if(IsOK()){ | |
625 | tquality = GetQuality(kZcorr); | |
626 | if(tquality < quality) break; | |
627 | else quality = tquality; | |
628 | } | |
629 | kroadz *= 2.; | |
630 | } // Loop: iter | |
631 | if (!IsOK()) return kFALSE; | |
632 | ||
804bb02e | 633 | if(fReconstructor->GetStreamLevel(AliTRDReconstructor::kTracker)>=1) CookLabels(); |
d937ad7a | 634 | |
b1957d3c | 635 | // set ExB angle |
636 | SetExB(); | |
29b87567 | 637 | UpdateUsed(); |
638 | return kTRUE; | |
e4f2f73d | 639 | } |
640 | ||
641 | //____________________________________________________________________ | |
b1957d3c | 642 | Bool_t AliTRDseedV1::AttachClusters(AliTRDtrackingChamber *chamber, Bool_t tilt) |
e4f2f73d | 643 | { |
644 | // | |
645 | // Projective algorithm to attach clusters to seeding tracklets | |
646 | // | |
647 | // Parameters | |
648 | // | |
649 | // Output | |
650 | // | |
651 | // Detailed description | |
652 | // 1. Collapse x coordinate for the full detector plane | |
653 | // 2. truncated mean on y (r-phi) direction | |
654 | // 3. purge clusters | |
655 | // 4. truncated mean on z direction | |
656 | // 5. purge clusters | |
657 | // 6. fit tracklet | |
658 | // | |
b1957d3c | 659 | Bool_t kPRINT = kFALSE; |
29b87567 | 660 | if(!fReconstructor->GetRecoParam() ){ |
661 | AliError("Seed can not be used without a valid RecoParam."); | |
662 | return kFALSE; | |
663 | } | |
b1957d3c | 664 | // Initialize reco params for this tracklet |
665 | // 1. first time bin in the drift region | |
666 | Int_t t0 = 4; | |
667 | Int_t kClmin = Int_t(fReconstructor->GetRecoParam() ->GetFindableClusters()*AliTRDtrackerV1::GetNTimeBins()); | |
29b87567 | 668 | |
b1957d3c | 669 | Double_t syRef = TMath::Sqrt(fRefCov[0]); |
29b87567 | 670 | //define roads |
b1957d3c | 671 | Double_t kroady = 1.; |
672 | //fReconstructor->GetRecoParam() ->GetRoad1y(); | |
29b87567 | 673 | Double_t kroadz = fPadLength * 1.5 + 1.; |
b1957d3c | 674 | if(kPRINT) printf("AttachClusters() sy[%f] road[%f]\n", syRef, kroady); |
29b87567 | 675 | |
676 | // working variables | |
b1957d3c | 677 | const Int_t kNrows = 16; |
678 | AliTRDcluster *clst[kNrows][knTimebins]; | |
679 | Double_t cond[4], dx, dy, yt, zt, | |
680 | yres[kNrows][knTimebins]; | |
681 | Int_t idxs[kNrows][knTimebins], ncl[kNrows], ncls = 0; | |
682 | memset(ncl, 0, kNrows*sizeof(Int_t)); | |
683 | memset(clst, 0, kNrows*knTimebins*sizeof(AliTRDcluster*)); | |
684 | ||
29b87567 | 685 | // Do cluster projection |
b1957d3c | 686 | AliTRDcluster *c = 0x0; |
29b87567 | 687 | AliTRDchamberTimeBin *layer = 0x0; |
b1957d3c | 688 | Bool_t kBUFFER = kFALSE; |
689 | for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) { | |
690 | if(!(layer = chamber->GetTB(it))) continue; | |
29b87567 | 691 | if(!Int_t(*layer)) continue; |
692 | ||
b1957d3c | 693 | dx = fX0 - layer->GetX(); |
694 | yt = fYref[0] - fYref[1] * dx; | |
695 | zt = fZref[0] - fZref[1] * dx; | |
696 | if(kPRINT) printf("\t%2d dx[%f] yt[%f] zt[%f]\n", it, dx, yt, zt); | |
697 | ||
698 | // select clusters on a 5 sigmaKalman level | |
699 | cond[0] = yt; cond[2] = kroady; | |
700 | cond[1] = zt; cond[3] = kroadz; | |
701 | Int_t n=0, idx[6]; | |
702 | layer->GetClusters(cond, idx, n, 6); | |
703 | for(Int_t ic = n; ic--;){ | |
704 | c = (*layer)[idx[ic]]; | |
705 | dy = yt - c->GetY(); | |
706 | dy += tilt ? fTilt * (c->GetZ() - zt) : 0.; | |
707 | // select clusters on a 3 sigmaKalman level | |
708 | /* if(tilt && TMath::Abs(dy) > 3.*syRef){ | |
709 | printf("too large !!!\n"); | |
710 | continue; | |
711 | }*/ | |
712 | Int_t r = c->GetPadRow(); | |
713 | if(kPRINT) printf("\t\t%d dy[%f] yc[%f] r[%d]\n", ic, TMath::Abs(dy), c->GetY(), r); | |
714 | clst[r][ncl[r]] = c; | |
715 | idxs[r][ncl[r]] = idx[ic]; | |
716 | yres[r][ncl[r]] = dy; | |
717 | ncl[r]++; ncls++; | |
718 | ||
719 | if(ncl[r] >= knTimebins) { | |
720 | AliWarning(Form("Cluster candidates reached limit %d. Some may be lost.", knTimebins)); | |
721 | kBUFFER = kTRUE; | |
29b87567 | 722 | break; |
723 | } | |
724 | } | |
b1957d3c | 725 | if(kBUFFER) break; |
29b87567 | 726 | } |
b1957d3c | 727 | if(kPRINT) printf("Found %d clusters\n", ncls); |
728 | if(ncls<kClmin) return kFALSE; | |
729 | ||
730 | // analyze each row individualy | |
731 | Double_t mean, syDis; | |
732 | Int_t nrow[] = {0, 0, 0}, nr = 0, lr=-1; | |
733 | for(Int_t ir=kNrows; ir--;){ | |
734 | if(!(ncl[ir])) continue; | |
735 | if(lr>0 && lr-ir != 1){ | |
736 | if(kPRINT) printf("W - gap in rows attached !!\n"); | |
29b87567 | 737 | } |
b1957d3c | 738 | if(kPRINT) printf("\tir[%d] lr[%d] n[%d]\n", ir, lr, ncl[ir]); |
739 | // Evaluate truncated mean on the y direction | |
740 | if(ncl[ir] > 3) AliMathBase::EvaluateUni(ncl[ir], yres[ir], mean, syDis, Int_t(ncl[ir]*.8)); | |
741 | else { | |
742 | mean = 0.; syDis = 0.; | |
743 | } | |
744 | ||
745 | // TODO check mean and sigma agains cluster resolution !! | |
746 | if(kPRINT) printf("\tr[%2d] m[%f %5.3fsigma] s[%f]\n", ir, mean, TMath::Abs(mean/syRef), syDis); | |
747 | // select clusters on a 3 sigmaDistr level | |
748 | Bool_t kFOUND = kFALSE; | |
749 | for(Int_t ic = ncl[ir]; ic--;){ | |
750 | if(yres[ir][ic] - mean > 3. * syDis){ | |
751 | clst[ir][ic] = 0x0; continue; | |
752 | } | |
753 | nrow[nr]++; kFOUND = kTRUE; | |
754 | } | |
755 | // exit loop | |
756 | if(kFOUND) nr++; | |
757 | lr = ir; if(nr>=3) break; | |
29b87567 | 758 | } |
b1957d3c | 759 | if(kPRINT) printf("lr[%d] nr[%d] nrow[0]=%d nrow[1]=%d nrow[2]=%d\n", lr, nr, nrow[0], nrow[1], nrow[2]); |
760 | ||
761 | // classify cluster rows | |
762 | Int_t row = -1; | |
763 | switch(nr){ | |
764 | case 1: | |
765 | row = lr; | |
766 | break; | |
767 | case 2: | |
768 | SetBit(kRowCross, kTRUE); // mark pad row crossing | |
769 | if(nrow[0] > nrow[1]){ row = lr+1; lr = -1;} | |
770 | else{ | |
771 | row = lr; lr = 1; | |
772 | nrow[2] = nrow[1]; | |
773 | nrow[1] = nrow[0]; | |
774 | nrow[0] = nrow[2]; | |
29b87567 | 775 | } |
b1957d3c | 776 | break; |
777 | case 3: | |
778 | SetBit(kRowCross, kTRUE); // mark pad row crossing | |
779 | break; | |
29b87567 | 780 | } |
b1957d3c | 781 | if(kPRINT) printf("\trow[%d] n[%d]\n\n", row, nrow[0]); |
782 | if(row<0) return kFALSE; | |
29b87567 | 783 | |
b1957d3c | 784 | // Select and store clusters |
785 | // We should consider here : | |
786 | // 1. How far is the chamber boundary | |
787 | // 2. How big is the mean | |
29b87567 | 788 | fN2 = 0; |
b1957d3c | 789 | for (Int_t ir = 0; ir < nr; ir++) { |
790 | Int_t jr = row + ir*lr; | |
791 | if(kPRINT) printf("\tattach %d clusters for row %d\n", ncl[jr], jr); | |
792 | for (Int_t ic = 0; ic < ncl[jr]; ic++) { | |
793 | if(!(c = clst[jr][ic])) continue; | |
794 | Int_t it = c->GetPadTime(); | |
795 | // TODO proper indexing of clusters !! | |
796 | fIndexes[it+35*ir] = chamber->GetTB(it)->GetGlobalIndex(idxs[jr][ic]); | |
797 | fClusters[it+35*ir] = c; | |
29b87567 | 798 | |
b1957d3c | 799 | //printf("\tid[%2d] it[%d] idx[%d]\n", ic, it, fIndexes[it]); |
800 | ||
801 | fN2++; | |
802 | } | |
803 | } | |
804 | ||
29b87567 | 805 | // number of minimum numbers of clusters expected for the tracklet |
e4f2f73d | 806 | if (fN2 < kClmin){ |
29b87567 | 807 | AliWarning(Form("Not enough clusters to fit the tracklet %d [%d].", fN2, kClmin)); |
e4f2f73d | 808 | fN2 = 0; |
809 | return kFALSE; | |
810 | } | |
0906e73e | 811 | |
b1957d3c | 812 | // update used clusters and select |
29b87567 | 813 | fNUsed = 0; |
b1957d3c | 814 | for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) { |
815 | if(fClusters[it] && fClusters[it]->IsUsed()) fNUsed++; | |
816 | if(fClusters[it+35] && fClusters[it+35]->IsUsed()) fNUsed++; | |
29b87567 | 817 | } |
0906e73e | 818 | if (fN2-fNUsed < kClmin){ |
b1957d3c | 819 | //AliWarning(Form("Too many clusters already in use %d (from %d).", fNUsed, fN2)); |
0906e73e | 820 | fN2 = 0; |
821 | return kFALSE; | |
822 | } | |
b1957d3c | 823 | |
824 | // set the Lorentz angle for this tracklet | |
825 | SetExB(); | |
826 | ||
827 | // calculate dx for time bins in the drift region (calibration aware) | |
828 | Int_t irp = 0; Float_t x[2]; Int_t tb[2]; | |
829 | for (Int_t it = t0; it < AliTRDtrackerV1::GetNTimeBins(); it++) { | |
830 | if(!fClusters[it]) continue; | |
831 | x[irp] = fClusters[it]->GetX(); | |
832 | tb[irp] = it; | |
833 | irp++; | |
834 | if(irp==2) break; | |
835 | } | |
836 | fdX = (x[1] - x[0]) / (tb[0] - tb[1]); | |
837 | ||
838 | // update X0 from the clusters (calibration/alignment aware) TODO remove dependence on x0 !! | |
839 | for (Int_t it = 0; it < AliTRDtrackerV1::GetNTimeBins(); it++) { | |
840 | if(!(layer = chamber->GetTB(it))) continue; | |
841 | if(!layer->IsT0()) continue; | |
842 | if(fClusters[it]){ | |
843 | fX0 = fClusters[it]->GetX(); | |
844 | break; | |
845 | } else { // we have to infere the position of the anode wire from the other clusters | |
846 | for (Int_t jt = it+1; jt < AliTRDtrackerV1::GetNTimeBins(); jt++) { | |
847 | if(!fClusters[jt]) continue; | |
848 | fX0 = fClusters[jt]->GetX() + fdX * (jt - it); | |
849 | break; | |
850 | } | |
851 | } | |
852 | } | |
853 | ||
29b87567 | 854 | return kTRUE; |
e4f2f73d | 855 | } |
856 | ||
03cef9b2 | 857 | //____________________________________________________________ |
858 | void AliTRDseedV1::Bootstrap(const AliTRDReconstructor *rec) | |
859 | { | |
860 | // Fill in all derived information. It has to be called after recovery from file or HLT. | |
861 | // The primitive data are | |
862 | // - list of clusters | |
863 | // - detector (as the detector will be removed from clusters) | |
864 | // - position of anode wire (fX0) - temporary | |
865 | // - track reference position and direction | |
866 | // - momentum of the track | |
867 | // - time bin length [cm] | |
868 | // | |
869 | // A.Bercuci <A.Bercuci@gsi.de> Oct 30th 2008 | |
870 | // | |
871 | fReconstructor = rec; | |
872 | AliTRDgeometry g; | |
873 | AliTRDpadPlane *pp = g.GetPadPlane(fDet); | |
874 | fTilt = TMath::Tan(TMath::DegToRad()*pp->GetTiltingAngle()); | |
875 | fPadLength = pp->GetLengthIPad(); | |
876 | fSnp = fYref[1]/TMath::Sqrt(1+fYref[1]*fYref[1]); | |
877 | fTgl = fZref[1]; | |
878 | fN = 0; fN2 = 0; fMPads = 0.; | |
879 | AliTRDcluster **cit = &fClusters[0]; | |
880 | for(Int_t ic = knTimebins; ic--; cit++){ | |
881 | if(!(*cit)) return; | |
882 | fN++; fN2++; | |
883 | fX[ic] = (*cit)->GetX() - fX0; | |
884 | fY[ic] = (*cit)->GetY(); | |
885 | fZ[ic] = (*cit)->GetZ(); | |
886 | } | |
887 | Update(); // Fit(); | |
888 | CookLabels(); | |
889 | GetProbability(); | |
890 | } | |
891 | ||
892 | ||
e4f2f73d | 893 | //____________________________________________________________________ |
d937ad7a | 894 | Bool_t AliTRDseedV1::Fit(Bool_t tilt, Int_t errors) |
e4f2f73d | 895 | { |
896 | // | |
897 | // Linear fit of the tracklet | |
898 | // | |
899 | // Parameters : | |
900 | // | |
901 | // Output : | |
902 | // True if successful | |
903 | // | |
904 | // Detailed description | |
905 | // 2. Check if tracklet crosses pad row boundary | |
906 | // 1. Calculate residuals in the y (r-phi) direction | |
907 | // 3. Do a Least Square Fit to the data | |
908 | // | |
909 | ||
29b87567 | 910 | const Int_t kClmin = 8; |
010d62b0 | 911 | |
9462866a | 912 | |
913 | // cluster error parametrization parameters | |
010d62b0 | 914 | // 1. sy total charge |
9462866a | 915 | const Float_t sq0inv = 0.019962; // [1/q0] |
916 | const Float_t sqb = 1.0281564; //[cm] | |
010d62b0 | 917 | // 2. sy for the PRF |
918 | const Float_t scy[AliTRDgeometry::kNlayer][4] = { | |
d937ad7a | 919 | {2.827e-02, 9.600e-04, 4.296e-01, 2.271e-02}, |
920 | {2.952e-02,-2.198e-04, 4.146e-01, 2.339e-02}, | |
921 | {3.090e-02, 1.514e-03, 4.020e-01, 2.402e-02}, | |
922 | {3.260e-02,-2.037e-03, 3.946e-01, 2.509e-02}, | |
923 | {3.439e-02,-3.601e-04, 3.883e-01, 2.623e-02}, | |
924 | {3.510e-02, 2.066e-03, 3.651e-01, 2.588e-02}, | |
010d62b0 | 925 | }; |
926 | // 3. sy parallel to the track | |
d937ad7a | 927 | const Float_t sy0 = 2.649e-02; // [cm] |
928 | const Float_t sya = -8.864e-04; // [cm] | |
929 | const Float_t syb = -2.435e-01; // [cm] | |
930 | ||
010d62b0 | 931 | // 4. sx parallel to the track |
d937ad7a | 932 | const Float_t sxgc = 5.427e-02; |
933 | const Float_t sxgm = 7.783e-01; | |
934 | const Float_t sxgs = 2.743e-01; | |
935 | const Float_t sxe0 =-2.065e+00; | |
936 | const Float_t sxe1 =-2.978e-02; | |
937 | ||
010d62b0 | 938 | // 5. sx perpendicular to the track |
d937ad7a | 939 | // const Float_t sxd0 = 1.881e-02; |
940 | // const Float_t sxd1 =-4.101e-01; | |
941 | // const Float_t sxd2 = 1.572e+00; | |
942 | ||
2f7d6ac8 | 943 | // get track direction |
944 | Double_t y0 = fYref[0]; | |
945 | Double_t dydx = fYref[1]; | |
946 | Double_t z0 = fZref[0]; | |
947 | Double_t dzdx = fZref[1]; | |
948 | Double_t yt, zt; | |
ae4e8b84 | 949 | |
29b87567 | 950 | const Int_t kNtb = AliTRDtrackerV1::GetNTimeBins(); |
b1957d3c | 951 | //AliTRDtrackerV1::AliTRDLeastSquare fitterZ; |
24d8660e | 952 | TLinearFitter fitterY(1, "pol1"); |
29b87567 | 953 | // convertion factor from square to gauss distribution for sigma |
b1957d3c | 954 | //Double_t convert = 1./TMath::Sqrt(12.); |
ae4e8b84 | 955 | |
29b87567 | 956 | // book cluster information |
b1957d3c | 957 | Double_t q, xc[knTimebins], yc[knTimebins], zc[knTimebins], sy[knTimebins]/*, sz[knTimebins]*/; |
958 | // Int_t zRow[knTimebins]; | |
9462866a | 959 | |
010d62b0 | 960 | Int_t ily = AliTRDgeometry::GetLayer(fDet); |
b1957d3c | 961 | fN = 0; //fXref = 0.; Double_t ssx = 0.; |
9eb2d46c | 962 | AliTRDcluster *c=0x0, **jc = &fClusters[0]; |
9eb2d46c | 963 | for (Int_t ic=0; ic<kNtb; ic++, ++jc) { |
b1957d3c | 964 | //zRow[ic] = -1; |
29b87567 | 965 | xc[ic] = -1.; |
966 | yc[ic] = 999.; | |
967 | zc[ic] = 999.; | |
968 | sy[ic] = 0.; | |
b1957d3c | 969 | //sz[ic] = 0.; |
9eb2d46c | 970 | if(!(c = (*jc))) continue; |
29b87567 | 971 | if(!c->IsInChamber()) continue; |
9462866a | 972 | |
29b87567 | 973 | Float_t w = 1.; |
974 | if(c->GetNPads()>4) w = .5; | |
975 | if(c->GetNPads()>5) w = .2; | |
010d62b0 | 976 | |
b1957d3c | 977 | //zRow[fN] = c->GetPadRow(); |
d937ad7a | 978 | // correct cluster position for PRF and v drift |
979 | Double_t x, y; GetClusterXY(c, x, y); | |
980 | xc[fN] = fX0 - x; | |
981 | yc[fN] = y; | |
2f7d6ac8 | 982 | zc[fN] = c->GetZ(); |
983 | ||
984 | // extrapolated y value for the track | |
985 | yt = y0 - xc[fN]*dydx; | |
986 | // extrapolated z value for the track | |
987 | zt = z0 - xc[fN]*dzdx; | |
988 | // tilt correction | |
989 | if(tilt) yc[fN] -= fTilt*(zc[fN] - zt); | |
990 | ||
010d62b0 | 991 | // ELABORATE CLUSTER ERROR |
992 | // TODO to be moved to AliTRDcluster | |
9462866a | 993 | q = TMath::Abs(c->GetQ()); |
d937ad7a | 994 | Double_t tgg = (dydx-fExB)/(1.+dydx*fExB); tgg *= tgg; |
010d62b0 | 995 | // basic y error (|| to track). |
d937ad7a | 996 | sy[fN] = xc[fN] < AliTRDgeometry::CamHght() ? 2. : sy0 + sya*TMath::Exp(1./(xc[fN]+syb)); |
997 | //printf("cluster[%d]\n\tsy[0] = %5.3e [um]\n", fN, sy[fN]*1.e4); | |
010d62b0 | 998 | // y error due to total charge |
999 | sy[fN] += sqb*(1./q - sq0inv); | |
d937ad7a | 1000 | //printf("\tsy[1] = %5.3e [um]\n", sy[fN]*1.e4); |
010d62b0 | 1001 | // y error due to PRF |
1002 | sy[fN] += scy[ily][0]*TMath::Gaus(c->GetCenter(), scy[ily][1], scy[ily][2]) - scy[ily][3]; | |
d937ad7a | 1003 | //printf("\tsy[2] = %5.3e [um]\n", sy[fN]*1.e4); |
1004 | ||
010d62b0 | 1005 | sy[fN] *= sy[fN]; |
1006 | ||
1007 | // ADD ERROR ON x | |
9462866a | 1008 | // error of drift length parallel to the track |
d937ad7a | 1009 | Double_t sx = sxgc*TMath::Gaus(xc[fN], sxgm, sxgs) + TMath::Exp(sxe0+sxe1*xc[fN]); // [cm] |
1010 | //printf("\tsx[0] = %5.3e [um]\n", sx*1.e4); | |
9462866a | 1011 | // error of drift length perpendicular to the track |
1012 | //sx += sxd0 + sxd1*d + sxd2*d*d; | |
d937ad7a | 1013 | sx *= sx; // square sx |
1014 | // update xref | |
b1957d3c | 1015 | //fXref += xc[fN]/sx; ssx+=1./sx; |
d937ad7a | 1016 | |
9462866a | 1017 | // add error from ExB |
d937ad7a | 1018 | if(errors>0) sy[fN] += fExB*fExB*sx; |
1019 | //printf("\tsy[3] = %5.3e [um^2]\n", sy[fN]*1.e8); | |
1020 | ||
1021 | // global radial error due to misalignment/miscalibration | |
1022 | Double_t sx0 = 0.; sx0 *= sx0; | |
1023 | // add sx contribution to sy due to track angle | |
1024 | if(errors>1) sy[fN] += tgg*(sx+sx0); | |
1025 | // TODO we should add tilt pad correction here | |
1026 | //printf("\tsy[4] = %5.3e [um^2]\n", sy[fN]*1.e8); | |
1027 | c->SetSigmaY2(sy[fN]); | |
1028 | ||
9462866a | 1029 | sy[fN] = TMath::Sqrt(sy[fN]); |
24d8660e | 1030 | fitterY.AddPoint(&xc[fN], yc[fN]/*-yt*/, sy[fN]); |
2f7d6ac8 | 1031 | fN++; |
29b87567 | 1032 | } |
47d5d320 | 1033 | // to few clusters |
2f7d6ac8 | 1034 | if (fN < kClmin) return kFALSE; |
1035 | ||
d937ad7a | 1036 | // fit XY |
2f7d6ac8 | 1037 | fitterY.Eval(); |
d937ad7a | 1038 | fYfit[0] = fitterY.GetParameter(0); |
1039 | fYfit[1] = -fitterY.GetParameter(1); | |
1040 | // store covariance | |
1041 | Double_t *p = fitterY.GetCovarianceMatrix(); | |
1042 | fCov[0] = p[0]; // variance of y0 | |
1043 | fCov[1] = p[1]; // covariance of y0, dydx | |
1044 | fCov[2] = p[3]; // variance of dydx | |
b1957d3c | 1045 | // the ref radial position is set at the minimum of |
1046 | // the y variance of the tracklet | |
1047 | fXref = -fCov[1]/fCov[2]; //fXref = fX0 - fXref; | |
1048 | ||
1049 | // fit XZ | |
1050 | if(IsRowCross()){ | |
1051 | // TODO pad row cross position estimation !!! | |
1052 | //AliInfo(Form("Padrow cross in detector %d", fDet)); | |
1053 | fZfit[0] = .5*(zc[0]+zc[fN-1]); fZfit[1] = 0.; | |
1054 | } else { | |
1055 | fZfit[0] = zc[0]; fZfit[1] = 0.; | |
29b87567 | 1056 | } |
1057 | ||
29b87567 | 1058 | |
b1957d3c | 1059 | // // determine z offset of the fit |
1060 | // Float_t zslope = 0.; | |
1061 | // Int_t nchanges = 0, nCross = 0; | |
1062 | // if(nz==2){ // tracklet is crossing pad row | |
1063 | // // Find the break time allowing one chage on pad-rows | |
1064 | // // with maximal number of accepted clusters | |
1065 | // Int_t padRef = zRow[0]; | |
1066 | // for (Int_t ic=1; ic<fN; ic++) { | |
1067 | // if(zRow[ic] == padRef) continue; | |
1068 | // | |
1069 | // // debug | |
1070 | // if(zRow[ic-1] == zRow[ic]){ | |
1071 | // printf("ERROR in pad row change!!!\n"); | |
1072 | // } | |
1073 | // | |
1074 | // // evaluate parameters of the crossing point | |
1075 | // Float_t sx = (xc[ic-1] - xc[ic])*convert; | |
1076 | // fCross[0] = .5 * (xc[ic-1] + xc[ic]); | |
1077 | // fCross[2] = .5 * (zc[ic-1] + zc[ic]); | |
1078 | // fCross[3] = TMath::Max(dzdx * sx, .01); | |
1079 | // zslope = zc[ic-1] > zc[ic] ? 1. : -1.; | |
1080 | // padRef = zRow[ic]; | |
1081 | // nCross = ic; | |
1082 | // nchanges++; | |
1083 | // } | |
1084 | // } | |
1085 | // | |
1086 | // // condition on nCross and reset nchanges TODO | |
1087 | // | |
1088 | // if(nchanges==1){ | |
1089 | // if(dzdx * zslope < 0.){ | |
1090 | // AliInfo("Tracklet-Track mismatch in dzdx. TODO."); | |
1091 | // } | |
1092 | // | |
1093 | // | |
1094 | // //zc[nc] = fitterZ.GetFunctionParameter(0); | |
1095 | // fCross[1] = fYfit[0] - fCross[0] * fYfit[1]; | |
1096 | // fCross[0] = fX0 - fCross[0]; | |
1097 | // } | |
29b87567 | 1098 | |
2389e96f | 1099 | UpdateUsed(); |
29b87567 | 1100 | return kTRUE; |
e4f2f73d | 1101 | } |
1102 | ||
e4f2f73d | 1103 | |
1104 | //___________________________________________________________________ | |
203967fc | 1105 | void AliTRDseedV1::Print(Option_t *o) const |
e4f2f73d | 1106 | { |
1107 | // | |
1108 | // Printing the seedstatus | |
1109 | // | |
1110 | ||
203967fc | 1111 | AliInfo(Form("Det[%3d] Tilt[%+6.2f] Pad[%5.2f]", fDet, fTilt, fPadLength)); |
1112 | AliInfo(Form("Nattach[%2d] Nfit[%2d] Nuse[%2d] pads[%f]", fN, fN2, fNUsed, fMPads)); | |
1113 | 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])); | |
1114 | AliInfo(Form("Ref y[%7.2f] z[%7.2f] dydx[%5.2f] dzdx[%5.2f]", fYref[0], fZref[0], fYref[1], fZref[1])) | |
1115 | ||
1116 | ||
1117 | if(strcmp(o, "a")!=0) return; | |
1118 | ||
4dc4dc2e | 1119 | AliTRDcluster* const* jc = &fClusters[0]; |
1120 | for(int ic=0; ic<AliTRDtrackerV1::GetNTimeBins(); ic++, jc++) { | |
1121 | if(!(*jc)) continue; | |
203967fc | 1122 | (*jc)->Print(o); |
4dc4dc2e | 1123 | } |
e4f2f73d | 1124 | } |
47d5d320 | 1125 | |
203967fc | 1126 | |
1127 | //___________________________________________________________________ | |
1128 | Bool_t AliTRDseedV1::IsEqual(const TObject *o) const | |
1129 | { | |
1130 | // Checks if current instance of the class has the same essential members | |
1131 | // as the given one | |
1132 | ||
1133 | if(!o) return kFALSE; | |
1134 | const AliTRDseedV1 *inTracklet = dynamic_cast<const AliTRDseedV1*>(o); | |
1135 | if(!inTracklet) return kFALSE; | |
1136 | ||
1137 | for (Int_t i = 0; i < 2; i++){ | |
1138 | if ( fYref[i] != inTracklet->GetYref(i) ) return kFALSE; | |
1139 | if ( fZref[i] != inTracklet->GetZref(i) ) return kFALSE; | |
1140 | } | |
1141 | ||
1142 | if ( fSigmaY != inTracklet->GetSigmaY() ) return kFALSE; | |
1143 | if ( fSigmaY2 != inTracklet->GetSigmaY2() ) return kFALSE; | |
1144 | if ( fTilt != inTracklet->GetTilt() ) return kFALSE; | |
1145 | if ( fPadLength != inTracklet->GetPadLength() ) return kFALSE; | |
1146 | ||
1147 | for (Int_t i = 0; i < knTimebins; i++){ | |
1148 | if ( fX[i] != inTracklet->GetX(i) ) return kFALSE; | |
1149 | if ( fY[i] != inTracklet->GetY(i) ) return kFALSE; | |
1150 | if ( fZ[i] != inTracklet->GetZ(i) ) return kFALSE; | |
1151 | if ( fIndexes[i] != inTracklet->GetIndexes(i) ) return kFALSE; | |
1152 | if ( fUsable[i] != inTracklet->IsUsable(i) ) return kFALSE; | |
1153 | } | |
1154 | ||
1155 | for (Int_t i=0; i < 2; i++){ | |
1156 | if ( fYfit[i] != inTracklet->GetYfit(i) ) return kFALSE; | |
1157 | if ( fZfit[i] != inTracklet->GetZfit(i) ) return kFALSE; | |
1158 | if ( fYfitR[i] != inTracklet->GetYfitR(i) ) return kFALSE; | |
1159 | if ( fZfitR[i] != inTracklet->GetZfitR(i) ) return kFALSE; | |
1160 | if ( fLabels[i] != inTracklet->GetLabels(i) ) return kFALSE; | |
1161 | } | |
1162 | ||
1163 | if ( fMeanz != inTracklet->GetMeanz() ) return kFALSE; | |
1164 | if ( fZProb != inTracklet->GetZProb() ) return kFALSE; | |
1165 | if ( fN2 != inTracklet->GetN2() ) return kFALSE; | |
1166 | if ( fNUsed != inTracklet->GetNUsed() ) return kFALSE; | |
1167 | if ( fFreq != inTracklet->GetFreq() ) return kFALSE; | |
1168 | if ( fNChange != inTracklet->GetNChange() ) return kFALSE; | |
1169 | if ( fNChange != inTracklet->GetNChange() ) return kFALSE; | |
1170 | ||
1171 | if ( fC != inTracklet->GetC() ) return kFALSE; | |
1172 | if ( fCC != inTracklet->GetCC() ) return kFALSE; | |
1173 | if ( fChi2 != inTracklet->GetChi2() ) return kFALSE; | |
1174 | // if ( fChi2Z != inTracklet->GetChi2Z() ) return kFALSE; | |
1175 | ||
1176 | if ( fDet != inTracklet->GetDetector() ) return kFALSE; | |
1177 | if ( fMom != inTracklet->GetMomentum() ) return kFALSE; | |
1178 | if ( fdX != inTracklet->GetdX() ) return kFALSE; | |
1179 | ||
1180 | for (Int_t iCluster = 0; iCluster < knTimebins; iCluster++){ | |
1181 | AliTRDcluster *curCluster = fClusters[iCluster]; | |
1182 | AliTRDcluster *inCluster = inTracklet->GetClusters(iCluster); | |
1183 | if (curCluster && inCluster){ | |
1184 | if (! curCluster->IsEqual(inCluster) ) { | |
1185 | curCluster->Print(); | |
1186 | inCluster->Print(); | |
1187 | return kFALSE; | |
1188 | } | |
1189 | } else { | |
1190 | // if one cluster exists, and corresponding | |
1191 | // in other tracklet doesn't - return kFALSE | |
1192 | if(curCluster || inCluster) return kFALSE; | |
1193 | } | |
1194 | } | |
1195 | return kTRUE; | |
1196 | } |