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