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46d29e70 | 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 | ||
0fa7dfa7 | 16 | /* $Id$ */ |
46d29e70 | 17 | |
a2cb5b3d | 18 | #include <Riostream.h> |
5443e65e | 19 | #include <TObject.h> |
46d29e70 | 20 | |
46d29e70 | 21 | #include "AliTRDgeometry.h" |
22 | #include "AliTRDcluster.h" | |
23 | #include "AliTRDtrack.h" | |
79e94bf8 | 24 | #include "AliESDtrack.h" |
3c625a9b | 25 | #include "AliTRDclusterCorrection.h" |
b3a5a838 | 26 | |
46d29e70 | 27 | ClassImp(AliTRDtrack) |
28 | ||
46d29e70 | 29 | //_____________________________________________________________________________ |
30 | ||
a819a5f7 | 31 | AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index, |
5443e65e | 32 | const Double_t xx[5], const Double_t cc[15], |
33 | Double_t xref, Double_t alpha) : AliKalmanTrack() { | |
46d29e70 | 34 | //----------------------------------------------------------------- |
35 | // This is the main track constructor. | |
36 | //----------------------------------------------------------------- | |
5443e65e | 37 | |
38 | fSeedLab = -1; | |
46d29e70 | 39 | |
40 | fAlpha=alpha; | |
5443e65e | 41 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
42 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
43 | ||
46d29e70 | 44 | fX=xref; |
45 | ||
b3a5a838 | 46 | fY=xx[0]; fZ=xx[1]; fE=xx[2]; fT=xx[3]; fC=xx[4]; |
46d29e70 | 47 | |
48 | fCyy=cc[0]; | |
49 | fCzy=cc[1]; fCzz=cc[2]; | |
b3a5a838 | 50 | fCey=cc[3]; fCez=cc[4]; fCee=cc[5]; |
51 | fCty=cc[6]; fCtz=cc[7]; fCte=cc[8]; fCtt=cc[9]; | |
b8dc2353 | 52 | fCcy=cc[10]; fCcz=cc[11]; fCce=cc[12]; fCct=cc[13]; fCcc=cc[14]; |
53 | ||
5443e65e | 54 | fIndex[0]=index; |
55 | SetNumberOfClusters(1); | |
56 | ||
57 | fdEdx=0.; | |
a2b90f83 | 58 | |
b3a5a838 | 59 | fLhElectron = 0.0; |
9c9d2487 | 60 | fNWrong = 0; |
61 | fNRotate = 0; | |
3c625a9b | 62 | fStopped = 0; |
5443e65e | 63 | Double_t q = TMath::Abs(c->GetQ()); |
a819a5f7 | 64 | Double_t s = fX*fC - fE, t=fT; |
5443e65e | 65 | if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t)); |
66 | ||
67 | fdQdl[0] = q; | |
0d5b5c27 | 68 | |
69 | // initialisation [SR, GSI 18.02.2003] (i startd for 1) | |
73ae7b59 | 70 | for(UInt_t i=1; i<kMAX_CLUSTERS_PER_TRACK; i++) { |
0d5b5c27 | 71 | fdQdl[i] = 0; |
72 | fIndex[i] = 0; | |
46e2d86c | 73 | fIndexBackup[i] = 0; //bacup indexes MI |
0d5b5c27 | 74 | } |
16d9fbba | 75 | fNCross =0; |
76 | fBackupTrack =0; | |
46d29e70 | 77 | } |
78 | ||
79 | //_____________________________________________________________________________ | |
5443e65e | 80 | AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) { |
46d29e70 | 81 | // |
82 | // Copy constructor. | |
83 | // | |
b8dc2353 | 84 | |
5443e65e | 85 | SetLabel(t.GetLabel()); |
86 | fSeedLab=t.GetSeedLabel(); | |
46d29e70 | 87 | |
5443e65e | 88 | SetChi2(t.GetChi2()); |
46d29e70 | 89 | fdEdx=t.fdEdx; |
90 | ||
b3a5a838 | 91 | fLhElectron = 0.0; |
9c9d2487 | 92 | fNWrong = t.fNWrong; |
93 | fNRotate = t.fNRotate; | |
3c625a9b | 94 | fStopped = t.fStopped; |
46d29e70 | 95 | fAlpha=t.fAlpha; |
96 | fX=t.fX; | |
97 | ||
b8dc2353 | 98 | fY=t.fY; fZ=t.fZ; fE=t.fE; fT=t.fT; fC=t.fC; |
46d29e70 | 99 | |
100 | fCyy=t.fCyy; | |
101 | fCzy=t.fCzy; fCzz=t.fCzz; | |
b3a5a838 | 102 | fCey=t.fCey; fCez=t.fCez; fCee=t.fCee; |
103 | fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt; | |
b8dc2353 | 104 | fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc; |
46d29e70 | 105 | |
5443e65e | 106 | Int_t n=t.GetNumberOfClusters(); |
107 | SetNumberOfClusters(n); | |
108 | for (Int_t i=0; i<n; i++) { | |
a819a5f7 | 109 | fIndex[i]=t.fIndex[i]; |
46e2d86c | 110 | fIndexBackup[i]=t.fIndex[i]; // MI - backup indexes |
a819a5f7 | 111 | fdQdl[i]=t.fdQdl[i]; |
112 | } | |
b8dc2353 | 113 | |
0d5b5c27 | 114 | // initialisation (i starts from n) [SR, GSI, 18.02.2003] |
73ae7b59 | 115 | for(UInt_t i=n; i<kMAX_CLUSTERS_PER_TRACK; i++) { |
0d5b5c27 | 116 | fdQdl[i] = 0; |
117 | fIndex[i] = 0; | |
46e2d86c | 118 | fIndexBackup[i] = 0; //MI backup indexes |
0d5b5c27 | 119 | } |
16d9fbba | 120 | fNCross =0; |
121 | fBackupTrack =0; | |
5443e65e | 122 | } |
123 | ||
124 | //_____________________________________________________________________________ | |
b3a5a838 | 125 | AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha) |
126 | :AliKalmanTrack(t) { | |
5443e65e | 127 | // |
128 | // Constructor from AliTPCtrack or AliITStrack . | |
129 | // | |
130 | ||
131 | SetLabel(t.GetLabel()); | |
132 | SetChi2(0.); | |
b8dc2353 | 133 | SetMass(t.GetMass()); |
5443e65e | 134 | SetNumberOfClusters(0); |
135 | ||
c73b3eb3 | 136 | fdEdx=t.GetdEdx(); |
5443e65e | 137 | |
b3a5a838 | 138 | fLhElectron = 0.0; |
9c9d2487 | 139 | fNWrong = 0; |
140 | fNRotate = 0; | |
3c625a9b | 141 | fStopped = 0; |
b3a5a838 | 142 | |
5443e65e | 143 | fAlpha = alpha; |
144 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
145 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
146 | ||
147 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
148 | ||
149 | fX=x; | |
150 | ||
151 | x = GetConvConst(); | |
152 | ||
b8dc2353 | 153 | fY=p[0]; |
154 | fZ=p[1]; | |
b3a5a838 | 155 | fT=p[3]; |
156 | fC=p[4]/x; | |
b8dc2353 | 157 | fE=fC*fX - p[2]; |
5443e65e | 158 | |
159 | //Conversion of the covariance matrix | |
160 | Double_t c[15]; t.GetExternalCovariance(c); | |
79e94bf8 | 161 | |
162 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
163 | ||
164 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
165 | Double_t c32=fX*c[13] - c[8]; | |
166 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
167 | ||
168 | fCyy=c[0 ]; | |
169 | fCzy=c[1 ]; fCzz=c[2 ]; | |
170 | fCey=c20; fCez=c21; fCee=c22; | |
171 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
172 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
173 | ||
174 | // Initialization [SR, GSI, 18.02.2003] | |
73ae7b59 | 175 | for(UInt_t i=0; i<kMAX_CLUSTERS_PER_TRACK; i++) { |
79e94bf8 | 176 | fdQdl[i] = 0; |
177 | fIndex[i] = 0; | |
46e2d86c | 178 | fIndexBackup[i] = 0; // MI backup indexes |
79e94bf8 | 179 | } |
16d9fbba | 180 | fNCross =0; |
181 | fBackupTrack =0; | |
79e94bf8 | 182 | } |
183 | //_____________________________________________________________________________ | |
184 | AliTRDtrack::AliTRDtrack(const AliESDtrack& t) | |
185 | :AliKalmanTrack() { | |
186 | // | |
187 | // Constructor from AliESDtrack | |
188 | // | |
189 | ||
190 | SetLabel(t.GetLabel()); | |
191 | SetChi2(0.); | |
192 | SetMass(t.GetMass()); | |
1e9bb598 | 193 | SetNumberOfClusters(t.GetTRDclusters(fIndex)); |
46e2d86c | 194 | Int_t ncl = t.GetTRDclusters(fIndexBackup); |
195 | for (UInt_t i=ncl;i<kMAX_CLUSTERS_PER_TRACK;i++) { | |
196 | fIndexBackup[i]=0; | |
197 | fIndex[i] = 0; //MI store indexes | |
198 | } | |
c73b3eb3 | 199 | fdEdx=t.GetTRDsignal(); |
79e94bf8 | 200 | |
201 | fLhElectron = 0.0; | |
202 | fNWrong = 0; | |
3c625a9b | 203 | fStopped = 0; |
79e94bf8 | 204 | fNRotate = 0; |
205 | ||
206 | fAlpha = t.GetAlpha(); | |
207 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
208 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
209 | ||
210 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
c5a8e3df | 211 | //Conversion of the covariance matrix |
212 | Double_t c[15]; t.GetExternalCovariance(c); | |
25cde026 | 213 | if (t.GetStatus()&AliESDtrack::kTRDbackup){ |
f4e9508c | 214 | t.GetTRDExternalParameters(x,fAlpha,p,c); |
215 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
216 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
c5a8e3df | 217 | } |
79e94bf8 | 218 | |
219 | fX=x; | |
220 | ||
221 | x = GetConvConst(); | |
222 | ||
223 | fY=p[0]; | |
224 | fZ=p[1]; | |
225 | fT=p[3]; | |
226 | fC=p[4]/x; | |
227 | fE=fC*fX - p[2]; | |
228 | ||
5443e65e | 229 | |
230 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
231 | ||
232 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
233 | Double_t c32=fX*c[13] - c[8]; | |
234 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
235 | ||
b8dc2353 | 236 | fCyy=c[0 ]; |
237 | fCzy=c[1 ]; fCzz=c[2 ]; | |
238 | fCey=c20; fCez=c21; fCee=c22; | |
239 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
240 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
5443e65e | 241 | |
0d5b5c27 | 242 | // Initialization [SR, GSI, 18.02.2003] |
73ae7b59 | 243 | for(UInt_t i=0; i<kMAX_CLUSTERS_PER_TRACK; i++) { |
0d5b5c27 | 244 | fdQdl[i] = 0; |
46e2d86c | 245 | // fIndex[i] = 0; //MI store indexes |
0d5b5c27 | 246 | } |
16d9fbba | 247 | fNCross =0; |
248 | fBackupTrack =0; | |
c630aafd | 249 | |
250 | if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return; | |
251 | StartTimeIntegral(); | |
252 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
253 | SetIntegratedLength(t.GetIntegratedLength()); | |
254 | ||
16d9fbba | 255 | } |
256 | ||
257 | AliTRDtrack::~AliTRDtrack() | |
258 | { | |
259 | // | |
260 | // | |
261 | if (fBackupTrack) delete fBackupTrack; | |
262 | fBackupTrack=0; | |
263 | } | |
264 | ||
9c9d2487 | 265 | //_____________________________________________________________________________ |
266 | ||
267 | void AliTRDtrack::GetBarrelTrack(AliBarrelTrack *track) { | |
268 | // | |
269 | // | |
270 | // | |
271 | ||
272 | if (!track) return; | |
273 | Double_t xr, vec[5], cov[15]; | |
274 | ||
275 | track->SetLabel(GetLabel()); | |
276 | track->SetX(fX, fAlpha); | |
277 | track->SetNClusters(GetNumberOfClusters(), GetChi2()); | |
278 | track->SetNWrongClusters(fNWrong); | |
279 | track->SetNRotate(fNRotate); | |
2b5dc063 | 280 | Double_t times[10]; |
281 | GetIntegratedTimes(times); | |
282 | track->SetTime(times, GetIntegratedLength()); | |
9c9d2487 | 283 | |
2b5dc063 | 284 | track->SetMass(GetMass()); |
285 | track->SetdEdX(GetdEdx()); | |
5443e65e | 286 | |
9c9d2487 | 287 | GetExternalParameters(xr, vec); |
288 | track->SetStateVector(vec); | |
289 | ||
290 | GetExternalCovariance(cov); | |
291 | track->SetCovarianceMatrix(cov); | |
292 | } | |
5443e65e | 293 | //____________________________________________________________________________ |
294 | void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
295 | // | |
296 | // This function returns external TRD track representation | |
297 | // | |
298 | xr=fX; | |
299 | x[0]=GetY(); | |
300 | x[1]=GetZ(); | |
301 | x[2]=GetSnp(); | |
302 | x[3]=GetTgl(); | |
b8dc2353 | 303 | x[4]=Get1Pt(); |
5443e65e | 304 | } |
305 | ||
306 | //_____________________________________________________________________________ | |
307 | void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const { | |
308 | // | |
309 | // This function returns external representation of the covriance matrix. | |
310 | // | |
311 | Double_t a=GetConvConst(); | |
312 | ||
b3a5a838 | 313 | Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee; |
314 | Double_t c32=fX*fCct-fCte; | |
315 | Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce; | |
5443e65e | 316 | |
317 | cc[0 ]=fCyy; | |
318 | cc[1 ]=fCzy; cc[2 ]=fCzz; | |
319 | cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22; | |
320 | cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt; | |
b8dc2353 | 321 | cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a; |
322 | ||
5443e65e | 323 | } |
324 | ||
46d29e70 | 325 | |
326 | //_____________________________________________________________________________ | |
327 | void AliTRDtrack::GetCovariance(Double_t cc[15]) const { | |
b8dc2353 | 328 | |
46d29e70 | 329 | cc[0]=fCyy; |
330 | cc[1]=fCzy; cc[2]=fCzz; | |
b3a5a838 | 331 | cc[3]=fCey; cc[4]=fCez; cc[5]=fCee; |
332 | cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc; | |
333 | cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt; | |
b8dc2353 | 334 | |
46d29e70 | 335 | } |
336 | ||
337 | //_____________________________________________________________________________ | |
2a941f4e | 338 | Int_t AliTRDtrack::Compare(const TObject *o) const { |
46d29e70 | 339 | |
5443e65e | 340 | // Compares tracks according to their Y2 or curvature |
46d29e70 | 341 | |
342 | AliTRDtrack *t=(AliTRDtrack*)o; | |
343 | // Double_t co=t->GetSigmaY2(); | |
344 | // Double_t c =GetSigmaY2(); | |
345 | ||
346 | Double_t co=TMath::Abs(t->GetC()); | |
347 | Double_t c =TMath::Abs(GetC()); | |
348 | ||
349 | if (c>co) return 1; | |
350 | else if (c<co) return -1; | |
351 | return 0; | |
352 | } | |
353 | ||
a819a5f7 | 354 | //_____________________________________________________________________________ |
355 | void AliTRDtrack::CookdEdx(Double_t low, Double_t up) { | |
356 | //----------------------------------------------------------------- | |
357 | // Calculates dE/dX within the "low" and "up" cuts. | |
358 | //----------------------------------------------------------------- | |
5443e65e | 359 | |
a819a5f7 | 360 | Int_t i; |
5443e65e | 361 | Int_t nc=GetNumberOfClusters(); |
a819a5f7 | 362 | |
5443e65e | 363 | Float_t sorted[kMAX_CLUSTERS_PER_TRACK]; |
364 | for (i=0; i < nc; i++) { | |
365 | sorted[i]=fdQdl[i]; | |
366 | } | |
a819a5f7 | 367 | |
368 | Int_t swap; | |
5443e65e | 369 | |
a819a5f7 | 370 | do { |
371 | swap=0; | |
372 | for (i=0; i<nc-1; i++) { | |
373 | if (sorted[i]<=sorted[i+1]) continue; | |
374 | Float_t tmp=sorted[i]; | |
375 | sorted[i]=sorted[i+1]; sorted[i+1]=tmp; | |
376 | swap++; | |
377 | } | |
378 | } while (swap); | |
379 | ||
380 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); | |
381 | Float_t dedx=0; | |
382 | for (i=nl; i<=nu; i++) dedx += sorted[i]; | |
383 | dedx /= (nu-nl+1); | |
5443e65e | 384 | |
a819a5f7 | 385 | SetdEdx(dedx); |
386 | } | |
387 | ||
388 | ||
46d29e70 | 389 | //_____________________________________________________________________________ |
b3a5a838 | 390 | Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) |
46d29e70 | 391 | { |
392 | // Propagates a track of particle with mass=pm to a reference plane | |
393 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
394 | ||
9c9d2487 | 395 | if (xk == fX) return 1; |
396 | ||
3c625a9b | 397 | if (TMath::Abs(fC*xk - fE) >= 0.90000) { |
398 | // Int_t n=GetNumberOfClusters(); | |
399 | //if (n>4) cerr << n << " AliTRDtrack: Propagation failed, \tPt = " | |
400 | // << GetPt() << "\t" << GetLabel() << "\t" << GetMass() << endl; | |
46d29e70 | 401 | return 0; |
402 | } | |
403 | ||
0d5b5c27 | 404 | // track Length measurement [SR, GSI, 17.02.2003] |
405 | Double_t oldX = fX, oldY = fY, oldZ = fZ; | |
406 | ||
46d29e70 | 407 | Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ; |
5443e65e | 408 | Double_t c1=fC*x1 - fE; |
409 | if((c1*c1) > 1) return 0; | |
410 | Double_t r1=sqrt(1.- c1*c1); | |
b8dc2353 | 411 | Double_t c2=fC*x2 - fE; |
5443e65e | 412 | if((c2*c2) > 1) return 0; |
413 | Double_t r2=sqrt(1.- c2*c2); | |
46d29e70 | 414 | |
415 | fY += dx*(c1+c2)/(r1+r2); | |
416 | fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
417 | ||
418 | //f = F - 1 | |
419 | Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2; | |
b3a5a838 | 420 | Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr); |
421 | Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr); | |
46d29e70 | 422 | Double_t cr=c1*r2+c2*r1; |
b3a5a838 | 423 | Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr); |
424 | Double_t f13= dx*cc/cr; | |
b8dc2353 | 425 | Double_t f14=dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr); |
46d29e70 | 426 | |
427 | //b = C*ft | |
b3a5a838 | 428 | Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty; |
429 | Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz; | |
430 | Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte; | |
431 | Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt; | |
432 | Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct; | |
46d29e70 | 433 | |
434 | //a = f*b = f*C*ft | |
b3a5a838 | 435 | Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31; |
46d29e70 | 436 | |
437 | //F*C*Ft = C + (a + b + bt) | |
438 | fCyy += a00 + 2*b00; | |
439 | fCzy += a01 + b01 + b10; | |
b3a5a838 | 440 | fCey += b20; |
441 | fCty += b30; | |
442 | fCcy += b40; | |
46d29e70 | 443 | fCzz += a11 + 2*b11; |
b3a5a838 | 444 | fCez += b21; |
445 | fCtz += b31; | |
b8dc2353 | 446 | fCcz += b41; |
46d29e70 | 447 | |
b8dc2353 | 448 | fX=x2; |
46d29e70 | 449 | |
450 | //Multiple scattering ****************** | |
46d29e70 | 451 | Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ)); |
b8dc2353 | 452 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); |
b3a5a838 | 453 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
b8dc2353 | 454 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho; |
46d29e70 | 455 | |
456 | Double_t ey=fC*fX - fE, ez=fT; | |
457 | Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey; | |
3c625a9b | 458 | |
46d29e70 | 459 | fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2; |
460 | fCte += ez*zz1*xy*theta2; | |
461 | fCtt += zz1*zz1*theta2; | |
b3a5a838 | 462 | fCce += xz*ez*xy*theta2; |
463 | fCct += xz*zz1*theta2; | |
464 | fCcc += xz*xz*theta2; | |
3c625a9b | 465 | /* |
466 | Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2; | |
467 | Double_t dc32 = (xz*fX*zz1)*theta2; | |
468 | Double_t dc33 = (zz1*zz1)*theta2; | |
469 | Double_t dc42 = (xz*fX*xz)*theta2; | |
470 | Double_t dc43 = (zz1*xz)*theta2; | |
471 | Double_t dc44 = (xz*xz)*theta2; | |
472 | fCee += dc22; | |
473 | fCte += dc32; | |
474 | fCtt += dc33; | |
475 | fCce += dc42; | |
476 | fCct += dc43; | |
477 | fCcc += dc44; | |
478 | */ | |
46d29e70 | 479 | //Energy losses************************ |
b8dc2353 | 480 | if((5940*beta2/(1-beta2+1e-10) - beta2) < 0) return 0; |
5443e65e | 481 | |
b8dc2353 | 482 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho; |
483 | if (x1 < x2) dE=-dE; | |
484 | cc=fC; | |
b3a5a838 | 485 | fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE); |
b8dc2353 | 486 | fE+=fX*(fC-cc); |
46d29e70 | 487 | |
0d5b5c27 | 488 | // track time measurement [SR, GSI 17.02.2002] |
0fa7dfa7 | 489 | if (x1 < x2) |
0d5b5c27 | 490 | if (IsStartedTimeIntegral()) { |
491 | Double_t l2 = (fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY) + (fZ-oldZ)*(fZ-oldZ); | |
492 | AddTimeStep(TMath::Sqrt(l2)); | |
493 | } | |
494 | ||
b8dc2353 | 495 | return 1; |
46d29e70 | 496 | } |
497 | ||
fd621f36 | 498 | |
46d29e70 | 499 | //_____________________________________________________________________________ |
fd621f36 | 500 | Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01) |
46d29e70 | 501 | { |
502 | // Assignes found cluster to the track and updates track information | |
503 | ||
b8dc2353 | 504 | Bool_t fNoTilt = kTRUE; |
505 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
46e2d86c | 506 | // add angular effect to the error contribution - MI |
3c625a9b | 507 | Float_t tangent2 = (fC*fX-fE)*(fC*fX-fE); |
508 | if (tangent2 < 0.90000){ | |
46e2d86c | 509 | tangent2 = tangent2/(1.-tangent2); |
510 | } | |
511 | Float_t errang = tangent2*0.04; // | |
512 | Float_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); | |
fd621f36 | 513 | |
46e2d86c | 514 | Double_t r00=c->GetSigmaY2() +errang, r01=0., r11=c->GetSigmaZ2()*100.; |
b8dc2353 | 515 | r00+=fCyy; r01+=fCzy; r11+=fCzz; |
46d29e70 | 516 | Double_t det=r00*r11 - r01*r01; |
517 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
518 | ||
b8dc2353 | 519 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; |
520 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
521 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
522 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
523 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
46d29e70 | 524 | |
525 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
b3a5a838 | 526 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; |
fd621f36 | 527 | |
46d29e70 | 528 | |
b8dc2353 | 529 | if(fNoTilt) { |
3c625a9b | 530 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
531 | // Int_t n=GetNumberOfClusters(); | |
532 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
b8dc2353 | 533 | return 0; |
534 | } | |
535 | fY += k00*dy + k01*dz; | |
536 | fZ += k10*dy + k11*dz; | |
537 | fE = eta; | |
9c9d2487 | 538 | //fT += k30*dy + k31*dz; |
b8dc2353 | 539 | fC = cur; |
540 | } | |
541 | else { | |
542 | Double_t xu_factor = 100.; // empirical factor set by C.Xu | |
543 | // in the first tilt version | |
46e2d86c | 544 | dy=c->GetY() - fY; dz=c->GetZ() - fZ; |
545 | dy=dy+h01*dz; | |
546 | Float_t add=0; | |
547 | if (TMath::Abs(dz)>padlength/2.){ | |
3c625a9b | 548 | Float_t dy2 = c->GetY() - fY; |
549 | Float_t sign = (dz>0) ? -1.: 1.; | |
550 | dy2+=h01*sign*padlength/2.; | |
551 | dy = dy2; | |
552 | add = 0; | |
46e2d86c | 553 | } |
554 | ||
555 | ||
556 | ||
557 | r00=c->GetSigmaY2()+errang+add, r01=0., r11=c->GetSigmaZ2()*xu_factor; | |
b8dc2353 | 558 | r00+=(fCyy+2.0*h01*fCzy+h01*h01*fCzz); |
46e2d86c | 559 | |
b8dc2353 | 560 | r01+=(fCzy+h01*fCzz); |
561 | det=r00*r11 - r01*r01; | |
562 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
563 | ||
564 | k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
565 | k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
566 | k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
567 | k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
568 | k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
569 | ||
b8dc2353 | 570 | |
571 | cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
3c625a9b | 572 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
573 | // Int_t n=GetNumberOfClusters(); | |
574 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
b8dc2353 | 575 | return 0; |
576 | } | |
577 | fY += k00*dy + k01*dz; | |
578 | fZ += k10*dy + k11*dz; | |
579 | fE = eta; | |
46e2d86c | 580 | fT += k30*dy + k31*dz; |
b8dc2353 | 581 | fC = cur; |
582 | ||
583 | k01+=h01*k00; | |
584 | k11+=h01*k10; | |
585 | k21+=h01*k20; | |
586 | k31+=h01*k30; | |
587 | k41+=h01*k40; | |
46e2d86c | 588 | |
b8dc2353 | 589 | } |
46e2d86c | 590 | Double_t c01=fCzy, c02=fCey, c03=fCty, c04=fCcy; |
591 | Double_t c12=fCez, c13=fCtz, c14=fCcz; | |
592 | ||
b8dc2353 | 593 | |
46d29e70 | 594 | fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz; |
b3a5a838 | 595 | fCey-=k00*c02+k01*c12; fCty-=k00*c03+k01*c13; |
596 | fCcy-=k00*c04+k01*c14; | |
b8dc2353 | 597 | |
46d29e70 | 598 | fCzz-=k10*c01+k11*fCzz; |
b3a5a838 | 599 | fCez-=k10*c02+k11*c12; fCtz-=k10*c03+k11*c13; |
600 | fCcz-=k10*c04+k11*c14; | |
b8dc2353 | 601 | |
b3a5a838 | 602 | fCee-=k20*c02+k21*c12; fCte-=k20*c03+k21*c13; |
603 | fCce-=k20*c04+k21*c14; | |
b8dc2353 | 604 | |
b3a5a838 | 605 | fCtt-=k30*c03+k31*c13; |
46e2d86c | 606 | fCct-=k40*c03+k41*c13; |
607 | //fCct-=k30*c04+k31*c14; // symmetric formula MI | |
b8dc2353 | 608 | |
609 | fCcc-=k40*c04+k41*c14; | |
46d29e70 | 610 | |
b8dc2353 | 611 | Int_t n=GetNumberOfClusters(); |
5443e65e | 612 | fIndex[n]=index; |
b8dc2353 | 613 | SetNumberOfClusters(n+1); |
fd621f36 | 614 | |
b8dc2353 | 615 | SetChi2(GetChi2()+chisq); |
46d29e70 | 616 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; |
5443e65e | 617 | |
b8dc2353 | 618 | return 1; |
46d29e70 | 619 | } |
46e2d86c | 620 | //_____________________________________________________________________________ |
3c625a9b | 621 | Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01, |
622 | Int_t plane) | |
46e2d86c | 623 | { |
624 | // Assignes found cluster to the track and updates track information | |
625 | ||
626 | Bool_t fNoTilt = kTRUE; | |
627 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
3c625a9b | 628 | // add angular effect to the error contribution and make correction - MI |
c5a8e3df | 629 | //AliTRDclusterCorrection *corrector = AliTRDclusterCorrection::GetCorrection(); |
3c625a9b | 630 | // |
631 | Double_t tangent2 = (fC*fX-fE)*(fC*fX-fE); | |
632 | if (tangent2 < 0.90000){ | |
46e2d86c | 633 | tangent2 = tangent2/(1.-tangent2); |
634 | } | |
3c625a9b | 635 | Double_t tangent = TMath::Sqrt(tangent2); |
636 | if ((fC*fX-fE)<0) tangent*=-1; | |
c5a8e3df | 637 | Double_t correction = 0*plane; |
46e2d86c | 638 | Double_t errang = tangent2*0.04; // |
c5a8e3df | 639 | /* |
3c625a9b | 640 | if (corrector!=0){ |
641 | //if (0){ | |
642 | correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent); | |
643 | if (TMath::Abs(correction)>0){ | |
644 | //if we have info | |
645 | errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent); | |
646 | errang *= errang; | |
647 | errang += tangent2*0.04; | |
648 | } | |
649 | } | |
c5a8e3df | 650 | */ |
3c625a9b | 651 | // |
46e2d86c | 652 | Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); |
653 | ||
654 | Double_t r00=c->GetSigmaY2() +errang, r01=0., r11=c->GetSigmaZ2()*10000.; | |
655 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
656 | Double_t det=r00*r11 - r01*r01; | |
657 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
658 | ||
659 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
660 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
661 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
662 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
663 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
664 | ||
665 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
666 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; | |
667 | ||
668 | ||
669 | if(fNoTilt) { | |
3c625a9b | 670 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
671 | // Int_t n=GetNumberOfClusters(); | |
672 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
46e2d86c | 673 | return 0; |
674 | } | |
675 | fY += k00*dy + k01*dz; | |
676 | fZ += k10*dy + k11*dz; | |
677 | fE = eta; | |
678 | //fT += k30*dy + k31*dz; | |
679 | fC = cur; | |
680 | } | |
681 | else { | |
3c625a9b | 682 | Double_t xu_factor = 1000.; // empirical factor set by C.Xu |
46e2d86c | 683 | // in the first tilt version |
684 | dy=c->GetY() - fY; dz=c->GetZ() - fZ; | |
3c625a9b | 685 | dy=dy+h01*dz+correction; |
46e2d86c | 686 | Double_t add=0; |
687 | if (TMath::Abs(dz)>padlength/2.){ | |
688 | //Double_t dy2 = c->GetY() - fY; | |
689 | //Double_t sign = (dz>0) ? -1.: 1.; | |
3c625a9b | 690 | //dy2-=h01*sign*padlength/2.; |
46e2d86c | 691 | //dy = dy2; |
3c625a9b | 692 | add =1.; |
46e2d86c | 693 | } |
694 | Double_t s00 = c->GetSigmaY2()+errang+add; // error pad | |
695 | Double_t s11 = c->GetSigmaZ2()*xu_factor; // error pad-row | |
696 | // | |
697 | r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00; | |
698 | r01 = fCzy + fCzz*h01; | |
699 | r11 = fCzz + s11; | |
700 | det = r00*r11 - r01*r01; | |
701 | // inverse matrix | |
702 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
703 | ||
704 | // K matrix | |
705 | k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
706 | k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
707 | k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
708 | k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
709 | k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
710 | // | |
711 | //Update measurement | |
712 | cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
3c625a9b | 713 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
714 | //Int_t n=GetNumberOfClusters(); | |
715 | // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
46e2d86c | 716 | return 0; |
717 | } | |
718 | fY += k00*dy + k01*dz; | |
719 | fZ += k10*dy + k11*dz; | |
720 | fE = eta; | |
721 | fT += k30*dy + k31*dz; | |
722 | fC = cur; | |
723 | ||
724 | k01+=h01*k00; | |
725 | k11+=h01*k10; | |
726 | k21+=h01*k20; | |
727 | k31+=h01*k30; | |
728 | k41+=h01*k40; | |
729 | ||
730 | } | |
731 | //Update covariance | |
732 | // | |
733 | // | |
734 | Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc; | |
735 | Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy; | |
736 | Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz; | |
737 | //Double_t oldte = fCte, oldce = fCce; | |
738 | //Double_t oldct = fCct; | |
739 | ||
740 | fCyy-=k00*oldyy+k01*oldzy; | |
741 | fCzy-=k10*oldyy+k11*oldzy; | |
742 | fCey-=k20*oldyy+k21*oldzy; | |
743 | fCty-=k30*oldyy+k31*oldzy; | |
744 | fCcy-=k40*oldyy+k41*oldzy; | |
745 | // | |
746 | fCzz-=k10*oldzy+k11*oldzz; | |
747 | fCez-=k20*oldzy+k21*oldzz; | |
748 | fCtz-=k30*oldzy+k31*oldzz; | |
749 | fCcz-=k40*oldzy+k41*oldzz; | |
750 | // | |
751 | fCee-=k20*oldey+k21*oldez; | |
752 | fCte-=k30*oldey+k31*oldez; | |
753 | fCce-=k40*oldey+k41*oldez; | |
754 | // | |
755 | fCtt-=k30*oldty+k31*oldtz; | |
756 | fCct-=k40*oldty+k41*oldtz; | |
757 | // | |
758 | fCcc-=k40*oldcy+k41*oldcz; | |
759 | // | |
760 | ||
761 | Int_t n=GetNumberOfClusters(); | |
762 | fIndex[n]=index; | |
763 | SetNumberOfClusters(n+1); | |
764 | ||
765 | SetChi2(GetChi2()+chisq); | |
766 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; | |
767 | ||
768 | return 1; | |
769 | } | |
46d29e70 | 770 | |
fd621f36 | 771 | |
46d29e70 | 772 | //_____________________________________________________________________________ |
773 | Int_t AliTRDtrack::Rotate(Double_t alpha) | |
774 | { | |
775 | // Rotates track parameters in R*phi plane | |
9c9d2487 | 776 | |
777 | fNRotate++; | |
46d29e70 | 778 | |
779 | fAlpha += alpha; | |
b3a5a838 | 780 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
b8dc2353 | 781 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); |
46d29e70 | 782 | |
783 | Double_t x1=fX, y1=fY; | |
784 | Double_t ca=cos(alpha), sa=sin(alpha); | |
785 | Double_t r1=fC*fX - fE; | |
786 | ||
787 | fX = x1*ca + y1*sa; | |
b8dc2353 | 788 | fY =-x1*sa + y1*ca; |
789 | if((r1*r1) > 1) return 0; | |
46d29e70 | 790 | fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa; |
791 | ||
792 | Double_t r2=fC*fX - fE; | |
3c625a9b | 793 | if (TMath::Abs(r2) >= 0.90000) { |
b8dc2353 | 794 | Int_t n=GetNumberOfClusters(); |
5443e65e | 795 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; |
46d29e70 | 796 | return 0; |
797 | } | |
798 | ||
b8dc2353 | 799 | if((r2*r2) > 1) return 0; |
46d29e70 | 800 | Double_t y0=fY + sqrt(1.- r2*r2)/fC; |
801 | if ((fY-y0)*fC >= 0.) { | |
b8dc2353 | 802 | Int_t n=GetNumberOfClusters(); |
5443e65e | 803 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n"; |
46d29e70 | 804 | return 0; |
805 | } | |
806 | ||
807 | //f = F - 1 | |
b3a5a838 | 808 | Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa, |
b8dc2353 | 809 | f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1; |
46d29e70 | 810 | |
811 | //b = C*ft | |
b3a5a838 | 812 | Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22; |
813 | Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22; | |
814 | Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22; | |
815 | Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22; | |
816 | Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22; | |
46d29e70 | 817 | |
818 | //a = f*b = f*C*ft | |
b3a5a838 | 819 | Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22; |
46d29e70 | 820 | |
46d29e70 | 821 | //F*C*Ft = C + (a + b + bt) |
822 | fCyy += a00 + 2*b00; | |
823 | fCzy += b10; | |
b3a5a838 | 824 | fCey += a02+b20+b02; |
825 | fCty += b30; | |
826 | fCcy += b40; | |
827 | fCez += b12; | |
828 | fCte += b32; | |
829 | fCee += a22 + 2*b22; | |
830 | fCce += b42; | |
46d29e70 | 831 | |
b8dc2353 | 832 | return 1; |
46d29e70 | 833 | } |
834 | ||
835 | ||
46d29e70 | 836 | //_____________________________________________________________________________ |
fd621f36 | 837 | Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const |
46d29e70 | 838 | { |
fd621f36 | 839 | |
b8dc2353 | 840 | Bool_t fNoTilt = kTRUE; |
841 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
842 | Double_t chi2, dy, r00, r01, r11; | |
843 | ||
844 | if(fNoTilt) { | |
845 | dy=c->GetY() - fY; | |
846 | r00=c->GetSigmaY2(); | |
847 | chi2 = (dy*dy)/r00; | |
46d29e70 | 848 | } |
b8dc2353 | 849 | else { |
850 | r00=c->GetSigmaY2(); r01=0.; r11=c->GetSigmaZ2(); | |
851 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
852 | ||
853 | Double_t det=r00*r11 - r01*r01; | |
854 | if (TMath::Abs(det) < 1.e-10) { | |
855 | Int_t n=GetNumberOfClusters(); | |
856 | if (n>4) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n"; | |
857 | return 1e10; | |
858 | } | |
859 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
860 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
861 | dy=dy+h01*dz; | |
a819a5f7 | 862 | |
b8dc2353 | 863 | chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; |
864 | } | |
865 | return chi2; | |
fd621f36 | 866 | } |
46d29e70 | 867 | |
868 | ||
869 | //_________________________________________________________________________ | |
870 | void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const | |
871 | { | |
872 | // Returns reconstructed track momentum in the global system. | |
873 | ||
874 | Double_t pt=TMath::Abs(GetPt()); // GeV/c | |
875 | Double_t r=fC*fX-fE; | |
5443e65e | 876 | |
877 | Double_t y0; | |
878 | if(r > 1) { py = pt; px = 0; } | |
879 | else if(r < -1) { py = -pt; px = 0; } | |
880 | else { | |
881 | y0=fY + sqrt(1.- r*r)/fC; | |
882 | px=-pt*(fY-y0)*fC; //cos(phi); | |
883 | py=-pt*(fE-fX*fC); //sin(phi); | |
884 | } | |
46d29e70 | 885 | pz=pt*fT; |
886 | Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha); | |
887 | py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha); | |
888 | px=tmp; | |
889 | ||
890 | } | |
891 | ||
5443e65e | 892 | //_________________________________________________________________________ |
893 | void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const | |
46d29e70 | 894 | { |
5443e65e | 895 | // Returns reconstructed track coordinates in the global system. |
896 | ||
897 | x = fX; y = fY; z = fZ; | |
898 | Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha); | |
899 | y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha); | |
900 | x=tmp; | |
901 | ||
902 | } | |
3ab6f951 | 903 | |
5443e65e | 904 | //_________________________________________________________________________ |
905 | void AliTRDtrack::ResetCovariance() { | |
906 | // | |
907 | // Resets covariance matrix | |
908 | // | |
46d29e70 | 909 | |
5443e65e | 910 | fCyy*=10.; |
b8dc2353 | 911 | fCzy=0.; fCzz*=10.; |
912 | fCey=0.; fCez=0.; fCee*=10.; | |
913 | fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.; | |
914 | fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.; | |
5443e65e | 915 | } |
b8dc2353 | 916 | |
46e2d86c | 917 | void AliTRDtrack::ResetCovariance(Float_t mult) { |
918 | // | |
919 | // Resets covariance matrix | |
920 | // | |
921 | ||
922 | fCyy*=mult; | |
3c625a9b | 923 | fCzy*=0.; fCzz*=mult; |
924 | fCey*=0.; fCez*=0.; fCee*=mult; | |
925 | fCty*=0.; fCtz*=0.; fCte*=0.; fCtt*=mult; | |
926 | fCcy*=0.; fCcz*=0.; fCce*=0.; fCct*=0.; fCcc*=mult; | |
46e2d86c | 927 | } |
16d9fbba | 928 | |
929 | ||
930 | void AliTRDtrack::MakeBackupTrack() | |
931 | { | |
932 | // | |
933 | // | |
934 | if (fBackupTrack) delete fBackupTrack; | |
935 | fBackupTrack = new AliTRDtrack(*this); | |
936 | } |