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