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75bd7f81 | 1 | /************************************************************************** |
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 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | /////////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // The seed of a local TRD track // | |
21 | // // | |
75bd7f81 | 22 | /////////////////////////////////////////////////////////////////////////////// |
23 | ||
ad670fba | 24 | #include "TMath.h" |
25 | #include "TLinearFitter.h" | |
26 | ||
4fad09c9 | 27 | #include "AliMathBase.h" |
28 | ||
75bd7f81 | 29 | #include "AliTRDseed.h" |
30 | #include "AliTRDcluster.h" | |
31 | #include "AliTRDtracker.h" | |
32 | ||
75bd7f81 | 33 | ClassImp(AliTRDseed) |
34 | ||
35 | //_____________________________________________________________________________ | |
ad670fba | 36 | AliTRDseed::AliTRDseed() |
37 | :TObject() | |
38 | ,fTilt(0) | |
39 | ,fPadLength(0) | |
40 | ,fX0(0) | |
41 | ,fSigmaY(0) | |
42 | ,fSigmaY2(0) | |
43 | ,fMeanz(0) | |
44 | ,fZProb(0) | |
45 | ,fN(0) | |
46 | ,fN2(0) | |
47 | ,fNUsed(0) | |
48 | ,fFreq(0) | |
49 | ,fNChange(0) | |
50 | ,fMPads(0) | |
51 | ,fC(0) | |
52 | ,fCC(0) | |
53 | ,fChi2(1.0e10) | |
54 | ,fChi2Z(1.0e10) | |
75bd7f81 | 55 | { |
56 | // | |
57 | // Default constructor | |
58 | // | |
59 | ||
60 | for (Int_t i = 0; i < 25; i++) { | |
ad670fba | 61 | fX[i] = 0; // x position |
62 | fY[i] = 0; // y position | |
63 | fZ[i] = 0; // z position | |
64 | fIndexes[i] = 0; // Indexes | |
65 | fClusters[i] = 0x0; // Clusters | |
66 | fUsable[i] = 0; // Indication - usable cluster | |
67 | } | |
68 | ||
69 | for (Int_t i = 0; i < 2; i++) { | |
70 | fYref[i] = 0; // Reference y | |
71 | fZref[i] = 0; // Reference z | |
72 | fYfit[i] = 0; // Y fit position +derivation | |
73 | fYfitR[i] = 0; // Y fit position +derivation | |
74 | fZfit[i] = 0; // Z fit position | |
75 | fZfitR[i] = 0; // Z fit position | |
76 | fLabels[i] = 0; // Labels | |
77 | } | |
78 | ||
79 | } | |
80 | ||
81 | //_____________________________________________________________________________ | |
82 | AliTRDseed::AliTRDseed(const AliTRDseed &s) | |
83 | :TObject(s) | |
4fad09c9 | 84 | ,fTilt(s.fTilt) |
85 | ,fPadLength(s.fPadLength) | |
86 | ,fX0(s.fX0) | |
87 | ,fSigmaY(s.fSigmaY) | |
88 | ,fSigmaY2(s.fSigmaY2) | |
89 | ,fMeanz(s.fMeanz) | |
90 | ,fZProb(s.fZProb) | |
91 | ,fN(s.fN) | |
92 | ,fN2(s.fN2) | |
93 | ,fNUsed(s.fNUsed) | |
94 | ,fFreq(s.fFreq) | |
95 | ,fNChange(s.fNChange) | |
96 | ,fMPads(s.fMPads) | |
97 | ,fC(s.fC) | |
98 | ,fCC(s.fCC) | |
99 | ,fChi2(s.fChi2) | |
100 | ,fChi2Z(s.fChi2Z) | |
ad670fba | 101 | { |
102 | // | |
103 | // Copy constructor | |
104 | // | |
105 | ||
106 | for (Int_t i = 0; i < 25; i++) { | |
4fad09c9 | 107 | fX[i] = s.fX[i]; // x position |
108 | fY[i] = s.fY[i]; // y position | |
109 | fZ[i] = s.fZ[i]; // z position | |
110 | fIndexes[i] = s.fIndexes[i]; // Indexes | |
111 | fClusters[i] = s.fClusters[i]; // Clusters | |
112 | fUsable[i] = s.fUsable[i]; // Indication - usable cluster | |
75bd7f81 | 113 | } |
ad670fba | 114 | |
75bd7f81 | 115 | for (Int_t i = 0; i < 2; i++) { |
4fad09c9 | 116 | fYref[i] = s.fYref[i]; // Reference y |
117 | fZref[i] = s.fZref[i]; // Reference z | |
118 | fYfit[i] = s.fYfit[i]; // Y fit position +derivation | |
119 | fYfitR[i] = s.fYfitR[i]; // Y fit position +derivation | |
120 | fZfit[i] = s.fZfit[i]; // Z fit position | |
121 | fZfitR[i] = s.fZfitR[i]; // Z fit position | |
122 | fLabels[i] = s.fLabels[i]; // Labels | |
75bd7f81 | 123 | } |
124 | ||
125 | } | |
126 | ||
127 | //_____________________________________________________________________________ | |
128 | void AliTRDseed::Reset() | |
129 | { | |
130 | // | |
131 | // Reset seed | |
132 | // | |
133 | ||
134 | for (Int_t i = 0; i < 25; i++) { | |
ad670fba | 135 | fX[i] = 0; // X position |
136 | fY[i] = 0; // Y position | |
137 | fZ[i] = 0; // Z position | |
138 | fIndexes[i] = 0; // Indexes | |
139 | fClusters[i] = 0; // Clusters | |
75bd7f81 | 140 | fUsable[i] = kFALSE; |
141 | } | |
ad670fba | 142 | |
75bd7f81 | 143 | for (Int_t i = 0; i < 2; i++) { |
ad670fba | 144 | fYref[i] = 0; // Reference y |
145 | fZref[i] = 0; // Reference z | |
146 | fYfit[i] = 0; // Y fit position +derivation | |
147 | fYfitR[i] = 0; // Y fit position +derivation | |
148 | fZfit[i] = 0; // Z fit position | |
149 | fZfitR[i] = 0; // Z fit position | |
150 | fLabels[i] = -1; // Labels | |
75bd7f81 | 151 | } |
ad670fba | 152 | fSigmaY = 0; // "Robust" sigma in y |
153 | fSigmaY2 = 0; // "Robust" sigma in y | |
154 | fMeanz = 0; // Mean vaue of z | |
155 | fZProb = 0; // Max probbable z | |
75bd7f81 | 156 | fMPads = 0; |
ad670fba | 157 | fN = 0; // Number of associated clusters |
158 | fN2 = 0; // Number of not crossed | |
159 | fNUsed = 0; // Number of used clusters | |
160 | fNChange = 0; // Change z counter | |
75bd7f81 | 161 | |
162 | } | |
163 | ||
164 | //_____________________________________________________________________________ | |
165 | void AliTRDseed::CookLabels() | |
166 | { | |
167 | // | |
168 | // Cook 2 labels for seed | |
169 | // | |
170 | ||
171 | Int_t labels[200]; | |
172 | Int_t out[200]; | |
ad670fba | 173 | Int_t nlab = 0; |
174 | ||
175 | for (Int_t i = 0; i < 25; i++) { | |
75bd7f81 | 176 | if (!fClusters[i]) continue; |
ad670fba | 177 | for (Int_t ilab = 0; ilab < 3; ilab++) { |
178 | if (fClusters[i]->GetLabel(ilab) >= 0) { | |
75bd7f81 | 179 | labels[nlab] = fClusters[i]->GetLabel(ilab); |
180 | nlab++; | |
181 | } | |
182 | } | |
183 | } | |
ad670fba | 184 | |
75bd7f81 | 185 | Int_t nlab2 = AliTRDtracker::Freq(nlab,labels,out,kTRUE); |
186 | fLabels[0] = out[0]; | |
ad670fba | 187 | if ((nlab2 > 1) && |
188 | (out[3] > 1)) { | |
189 | fLabels[1] = out[2]; | |
190 | } | |
75bd7f81 | 191 | |
192 | } | |
193 | ||
194 | //_____________________________________________________________________________ | |
195 | void AliTRDseed::UseClusters() | |
196 | { | |
197 | // | |
198 | // Use clusters | |
199 | // | |
200 | ||
ad670fba | 201 | for (Int_t i = 0; i < 25; i++) { |
75bd7f81 | 202 | if (!fClusters[i]) continue; |
203 | if (!(fClusters[i]->IsUsed())) fClusters[i]->Use(); | |
204 | } | |
205 | ||
206 | } | |
207 | ||
208 | //_____________________________________________________________________________ | |
209 | void AliTRDseed::Update() | |
210 | { | |
211 | // | |
212 | // Update the seed. | |
213 | // | |
214 | ||
215 | const Float_t kRatio = 0.8; | |
216 | const Int_t kClmin = 6; | |
217 | const Float_t kmaxtan = 2; | |
218 | ||
ad670fba | 219 | if (TMath::Abs(fYref[1]) > kmaxtan) return; // Track inclined too much |
220 | ||
221 | Float_t sigmaexp = 0.05 + TMath::Abs(fYref[1] * 0.25); // Expected r.m.s in y direction | |
222 | Float_t ycrosscor = fPadLength * fTilt * 0.5; // Y correction for crossing | |
223 | fNChange = 0; | |
224 | ||
225 | Double_t sumw; | |
226 | Double_t sumwx; | |
227 | Double_t sumwx2; | |
228 | Double_t sumwy; | |
229 | Double_t sumwxy; | |
230 | Double_t sumwz; | |
231 | Double_t sumwxz; | |
232 | ||
233 | Int_t zints[25]; // Histograming of the z coordinate | |
234 | // Get 1 and second max probable coodinates in z | |
235 | Int_t zouts[50]; | |
236 | Float_t allowedz[25]; // Allowed z for given time bin | |
237 | Float_t yres[25]; // Residuals from reference | |
238 | Float_t anglecor = fTilt * fZref[1]; // Correction to the angle | |
75bd7f81 | 239 | |
240 | ||
ad670fba | 241 | fN = 0; |
242 | fN2 = 0; | |
243 | for (Int_t i = 0; i < 25; i++) { | |
244 | yres[i] = 10000.0; | |
75bd7f81 | 245 | if (!fClusters[i]) continue; |
ad670fba | 246 | yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i]; // Residual y |
75bd7f81 | 247 | zints[fN] = Int_t(fZ[i]); |
248 | fN++; | |
249 | } | |
250 | ||
ad670fba | 251 | if (fN < kClmin) return; |
75bd7f81 | 252 | Int_t nz = AliTRDtracker::Freq(fN,zints,zouts,kFALSE); |
253 | fZProb = zouts[0]; | |
ad670fba | 254 | if (nz <= 1) zouts[3] = 0; |
255 | if (zouts[1] + zouts[3] < kClmin) return; | |
75bd7f81 | 256 | |
ad670fba | 257 | // Z distance bigger than pad - length |
258 | if (TMath::Abs(zouts[0]-zouts[2]) > 12.0) { | |
259 | zouts[3]=0; | |
260 | } | |
75bd7f81 | 261 | |
262 | Int_t breaktime = -1; | |
263 | Bool_t mbefore = kFALSE; | |
264 | Int_t cumul[25][2]; | |
ad670fba | 265 | Int_t counts[2] = { 0, 0 }; |
75bd7f81 | 266 | |
ad670fba | 267 | if (zouts[3] >= 3) { |
268 | ||
75bd7f81 | 269 | // |
ad670fba | 270 | // Find the break time allowing one chage on pad-rows |
271 | // with maximal numebr of accepted clusters | |
75bd7f81 | 272 | // |
ad670fba | 273 | fNChange = 1; |
274 | for (Int_t i = 0; i < 25; i++) { | |
75bd7f81 | 275 | cumul[i][0] = counts[0]; |
276 | cumul[i][1] = counts[1]; | |
ad670fba | 277 | if (TMath::Abs(fZ[i]-zouts[0]) < 2) counts[0]++; |
278 | if (TMath::Abs(fZ[i]-zouts[2]) < 2) counts[1]++; | |
75bd7f81 | 279 | } |
ad670fba | 280 | Int_t maxcount = 0; |
281 | for (Int_t i = 0; i < 24; i++) { | |
282 | Int_t after = cumul[24][0] - cumul[i][0]; | |
75bd7f81 | 283 | Int_t before = cumul[i][1]; |
ad670fba | 284 | if (after + before > maxcount) { |
285 | maxcount = after + before; | |
286 | breaktime = i; | |
287 | mbefore = kFALSE; | |
75bd7f81 | 288 | } |
ad670fba | 289 | after = cumul[24][1] - cumul[i][1]; |
75bd7f81 | 290 | before = cumul[i][0]; |
ad670fba | 291 | if (after + before > maxcount) { |
292 | maxcount = after + before; | |
293 | breaktime = i; | |
294 | mbefore = kTRUE; | |
75bd7f81 | 295 | } |
296 | } | |
ad670fba | 297 | |
298 | breaktime -= 1; | |
299 | ||
75bd7f81 | 300 | } |
ad670fba | 301 | |
302 | for (Int_t i = 0; i < 25; i++) { | |
303 | if (i > breaktime) allowedz[i] = mbefore ? zouts[2] : zouts[0]; | |
304 | if (i <= breaktime) allowedz[i] = (!mbefore) ? zouts[2] : zouts[0]; | |
75bd7f81 | 305 | } |
ad670fba | 306 | |
307 | if (((allowedz[0] > allowedz[24]) && (fZref[1] < 0)) || | |
308 | ((allowedz[0] < allowedz[24]) && (fZref[1] > 0))) { | |
75bd7f81 | 309 | // |
ad670fba | 310 | // Tracklet z-direction not in correspondance with track z direction |
75bd7f81 | 311 | // |
ad670fba | 312 | fNChange = 0; |
313 | for (Int_t i = 0; i < 25; i++) { | |
314 | allowedz[i] = zouts[0]; // Only longest taken | |
75bd7f81 | 315 | } |
316 | } | |
317 | ||
ad670fba | 318 | if (fNChange > 0) { |
75bd7f81 | 319 | // |
ad670fba | 320 | // Cross pad -row tracklet - take the step change into account |
75bd7f81 | 321 | // |
ad670fba | 322 | for (Int_t i = 0; i < 25; i++) { |
75bd7f81 | 323 | if (!fClusters[i]) continue; |
ad670fba | 324 | if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue; |
325 | yres[i] = fY[i] - fYref[0] - (fYref[1] + anglecor) * fX[i]; // Residual y | |
326 | if (TMath::Abs(fZ[i] - fZProb) > 2) { | |
327 | if (fZ[i] > fZProb) yres[i] += fTilt * fPadLength; | |
328 | if (fZ[i] < fZProb) yres[i] -= fTilt * fPadLength; | |
75bd7f81 | 329 | } |
330 | } | |
331 | } | |
332 | ||
333 | Double_t yres2[25]; | |
ad670fba | 334 | Double_t mean; |
335 | Double_t sigma; | |
336 | for (Int_t i = 0; i < 25; i++) { | |
75bd7f81 | 337 | if (!fClusters[i]) continue; |
ad670fba | 338 | if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue; |
339 | yres2[fN2] = yres[i]; | |
75bd7f81 | 340 | fN2++; |
341 | } | |
ad670fba | 342 | if (fN2 < kClmin) { |
75bd7f81 | 343 | fN2 = 0; |
344 | return; | |
345 | } | |
4fad09c9 | 346 | AliMathBase::EvaluateUni(fN2,yres2,mean,sigma,Int_t(fN2*kRatio-2)); |
ad670fba | 347 | if (sigma < sigmaexp * 0.8) { |
348 | sigma = sigmaexp; | |
349 | } | |
75bd7f81 | 350 | fSigmaY = sigma; |
ad670fba | 351 | |
352 | // Reset sums | |
353 | sumw = 0; | |
354 | sumwx = 0; | |
355 | sumwx2 = 0; | |
356 | sumwy = 0; | |
357 | sumwxy = 0; | |
358 | sumwz = 0; | |
359 | sumwxz = 0; | |
360 | ||
361 | fN2 = 0; | |
362 | fMeanz = 0; | |
363 | fMPads = 0; | |
364 | ||
365 | for (Int_t i = 0; i < 25; i++) { | |
366 | ||
367 | fUsable[i] = kFALSE; | |
75bd7f81 | 368 | if (!fClusters[i]) continue; |
ad670fba | 369 | if (TMath::Abs(fZ[i] - allowedz[i]) > 2) continue; |
370 | if (TMath::Abs(yres[i] - mean) > 4.0 * sigma) continue; | |
75bd7f81 | 371 | fUsable[i] = kTRUE; |
372 | fN2++; | |
ad670fba | 373 | fMPads += fClusters[i]->GetNPads(); |
374 | Float_t weight = 1.0; | |
375 | if (fClusters[i]->GetNPads() > 4) weight = 0.5; | |
376 | if (fClusters[i]->GetNPads() > 5) weight = 0.2; | |
377 | ||
75bd7f81 | 378 | Double_t x = fX[i]; |
ad670fba | 379 | sumw += weight; |
380 | sumwx += x * weight; | |
381 | sumwx2 += x*x * weight; | |
382 | sumwy += weight * yres[i]; | |
383 | sumwxy += weight * (yres[i]) * x; | |
384 | sumwz += weight * fZ[i]; | |
385 | sumwxz += weight * fZ[i] * x; | |
386 | ||
75bd7f81 | 387 | } |
ad670fba | 388 | |
389 | if (fN2 < kClmin){ | |
75bd7f81 | 390 | fN2 = 0; |
391 | return; | |
392 | } | |
ad670fba | 393 | fMeanz = sumwz / sumw; |
394 | Float_t correction = 0; | |
395 | if (fNChange > 0) { | |
396 | // Tracklet on boundary | |
397 | if (fMeanz < fZProb) correction = ycrosscor; | |
398 | if (fMeanz > fZProb) correction = -ycrosscor; | |
75bd7f81 | 399 | } |
ad670fba | 400 | |
401 | Double_t det = sumw * sumwx2 - sumwx * sumwx; | |
402 | fYfitR[0] = (sumwx2 * sumwy - sumwx * sumwxy) / det; | |
403 | fYfitR[1] = (sumw * sumwxy - sumwx * sumwy) / det; | |
75bd7f81 | 404 | |
ad670fba | 405 | fSigmaY2 = 0; |
406 | for (Int_t i = 0; i < 25; i++) { | |
75bd7f81 | 407 | if (!fUsable[i]) continue; |
ad670fba | 408 | Float_t delta = yres[i] - fYfitR[0] - fYfitR[1] * fX[i]; |
409 | fSigmaY2 += delta*delta; | |
75bd7f81 | 410 | } |
ad670fba | 411 | fSigmaY2 = TMath::Sqrt(fSigmaY2 / Float_t(fN2-2)); |
412 | ||
413 | fZfitR[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det; | |
414 | fZfitR[1] = (sumw * sumwxz - sumwx * sumwz) / det; | |
415 | fZfit[0] = (sumwx2 * sumwz - sumwx * sumwxz) / det; | |
416 | fZfit[1] = (sumw * sumwxz - sumwx * sumwz) / det; | |
417 | fYfitR[0] += fYref[0] + correction; | |
418 | fYfitR[1] += fYref[1]; | |
419 | fYfit[0] = fYfitR[0]; | |
420 | fYfit[1] = fYfitR[1]; | |
75bd7f81 | 421 | |
422 | UpdateUsed(); | |
423 | ||
424 | } | |
425 | ||
426 | //_____________________________________________________________________________ | |
427 | void AliTRDseed::UpdateUsed() | |
428 | { | |
429 | // | |
430 | // Update used seed | |
431 | // | |
432 | ||
433 | fNUsed = 0; | |
ad670fba | 434 | for (Int_t i = 0; i < 25; i++) { |
95a5eb17 | 435 | if (!fClusters[i]) { |
436 | continue; | |
437 | } | |
438 | if ((fClusters[i]->IsUsed())) { | |
439 | fNUsed++; | |
440 | } | |
75bd7f81 | 441 | } |
442 | ||
443 | } | |
444 | ||
75bd7f81 | 445 | //_____________________________________________________________________________ |
446 | Float_t AliTRDseed::FitRiemanTilt(AliTRDseed * cseed, Bool_t terror) | |
447 | { | |
448 | // | |
449 | // Fit the Rieman tilt | |
450 | // | |
451 | ||
ad670fba | 452 | // Fitting with tilting pads - kz not fixed |
453 | TLinearFitter fitterT2(4,"hyp4"); | |
75bd7f81 | 454 | fitterT2.StoreData(kTRUE); |
ad670fba | 455 | Float_t xref2 = (cseed[2].fX0 + cseed[3].fX0) * 0.5; // Reference x0 for z |
456 | ||
457 | Int_t npointsT = 0; | |
75bd7f81 | 458 | fitterT2.ClearPoints(); |
ad670fba | 459 | |
460 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
461 | ||
75bd7f81 | 462 | if (!cseed[iLayer].IsOK()) continue; |
463 | Double_t tilt = cseed[iLayer].fTilt; | |
464 | ||
ad670fba | 465 | for (Int_t itime = 0; itime < 25; itime++) { |
466 | ||
75bd7f81 | 467 | if (!cseed[iLayer].fUsable[itime]) continue; |
468 | // x relative to the midle chamber | |
ad670fba | 469 | Double_t x = cseed[iLayer].fX[itime] + cseed[iLayer].fX0 - xref2; |
470 | Double_t y = cseed[iLayer].fY[itime]; | |
471 | Double_t z = cseed[iLayer].fZ[itime]; | |
75bd7f81 | 472 | |
473 | // | |
ad670fba | 474 | // Tilted rieman |
75bd7f81 | 475 | // |
476 | Double_t uvt[6]; | |
ad670fba | 477 | Double_t x2 = cseed[iLayer].fX[itime] + cseed[iLayer].fX0; // Global x |
478 | Double_t t = 1.0 / (x2*x2 + y*y); | |
479 | uvt[1] = t; | |
480 | uvt[0] = 2.0 * x2 * uvt[1]; | |
481 | uvt[2] = 2.0 * tilt * uvt[1]; | |
482 | uvt[3] = 2.0 * tilt *uvt[1] * x; | |
483 | uvt[4] = 2.0 * (y + tilt * z) * uvt[1]; | |
484 | ||
485 | Double_t error = 2.0 * uvt[1]; | |
486 | if (terror) { | |
487 | error *= cseed[iLayer].fSigmaY; | |
488 | } | |
489 | else { | |
490 | error *= 0.2; //Default error | |
491 | } | |
75bd7f81 | 492 | fitterT2.AddPoint(uvt,uvt[4],error); |
493 | npointsT++; | |
ad670fba | 494 | |
75bd7f81 | 495 | } |
ad670fba | 496 | |
75bd7f81 | 497 | } |
ad670fba | 498 | |
75bd7f81 | 499 | fitterT2.Eval(); |
500 | Double_t rpolz0 = fitterT2.GetParameter(3); | |
501 | Double_t rpolz1 = fitterT2.GetParameter(4); | |
ad670fba | 502 | |
75bd7f81 | 503 | // |
ad670fba | 504 | // Linear fitter - not possible to make boundaries |
75bd7f81 | 505 | // non accept non possible z and dzdx combination |
506 | // | |
ad670fba | 507 | Bool_t acceptablez = kTRUE; |
508 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
509 | if (cseed[iLayer].IsOK()) { | |
510 | Double_t zT2 = rpolz0 + rpolz1 * (cseed[iLayer].fX0 - xref2); | |
511 | if (TMath::Abs(cseed[iLayer].fZProb - zT2) > cseed[iLayer].fPadLength * 0.5 + 1.0) { | |
75bd7f81 | 512 | acceptablez = kFALSE; |
ad670fba | 513 | } |
75bd7f81 | 514 | } |
515 | } | |
ad670fba | 516 | if (!acceptablez) { |
517 | Double_t zmf = cseed[2].fZref[0] + cseed[2].fZref[1] * (xref2 - cseed[2].fX0); | |
518 | Double_t dzmf = (cseed[2].fZref[1] + cseed[3].fZref[1]) * 0.5; | |
75bd7f81 | 519 | fitterT2.FixParameter(3,zmf); |
520 | fitterT2.FixParameter(4,dzmf); | |
521 | fitterT2.Eval(); | |
522 | fitterT2.ReleaseParameter(3); | |
523 | fitterT2.ReleaseParameter(4); | |
524 | rpolz0 = fitterT2.GetParameter(3); | |
525 | rpolz1 = fitterT2.GetParameter(4); | |
526 | } | |
527 | ||
ad670fba | 528 | Double_t chi2TR = fitterT2.GetChisquare() / Float_t(npointsT); |
75bd7f81 | 529 | Double_t params[3]; |
ad670fba | 530 | params[0] = fitterT2.GetParameter(0); |
531 | params[1] = fitterT2.GetParameter(1); | |
532 | params[2] = fitterT2.GetParameter(2); | |
533 | Double_t curvature = 1.0 + params[1] * params[1] - params[2] * params[0]; | |
534 | ||
535 | for (Int_t iLayer = 0; iLayer < 6; iLayer++) { | |
536 | ||
537 | Double_t x = cseed[iLayer].fX0; | |
538 | Double_t y = 0; | |
539 | Double_t dy = 0; | |
540 | Double_t z = 0; | |
541 | Double_t dz = 0; | |
542 | ||
75bd7f81 | 543 | // y |
ad670fba | 544 | Double_t res2 = (x * params[0] + params[1]); |
545 | res2 *= res2; | |
546 | res2 = 1.0 - params[2]*params[0] + params[1]*params[1] - res2; | |
547 | if (res2 >= 0) { | |
75bd7f81 | 548 | res2 = TMath::Sqrt(res2); |
ad670fba | 549 | y = (1.0 - res2) / params[0]; |
75bd7f81 | 550 | } |
ad670fba | 551 | |
75bd7f81 | 552 | //dy |
ad670fba | 553 | Double_t x0 = -params[1] / params[0]; |
554 | if (-params[2]*params[0] + params[1]*params[1] + 1 > 0) { | |
555 | Double_t rm1 = params[0] / TMath::Sqrt(-params[2]*params[0] + params[1]*params[1] + 1); | |
556 | if (1.0/(rm1*rm1) - (x-x0) * (x-x0) > 0.0) { | |
557 | Double_t res = (x - x0) / TMath::Sqrt(1.0 / (rm1*rm1) - (x-x0)*(x-x0)); | |
558 | if (params[0] < 0) res *= -1.0; | |
75bd7f81 | 559 | dy = res; |
560 | } | |
561 | } | |
ad670fba | 562 | z = rpolz0 + rpolz1 * (x - xref2); |
75bd7f81 | 563 | dz = rpolz1; |
564 | cseed[iLayer].fYref[0] = y; | |
565 | cseed[iLayer].fYref[1] = dy; | |
566 | cseed[iLayer].fZref[0] = z; | |
567 | cseed[iLayer].fZref[1] = dz; | |
ad670fba | 568 | cseed[iLayer].fC = curvature; |
75bd7f81 | 569 | |
570 | } | |
571 | ||
572 | return chi2TR; | |
573 | ||
574 | } |