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