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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 | ||
16 | /* | |
17 | $Log$ | |
b3a5a838 | 18 | Revision 1.14 2002/11/07 15:52:09 cblume |
19 | Update of tracking code for tilted pads | |
20 | ||
fd621f36 | 21 | Revision 1.13 2002/10/22 15:53:08 alibrary |
22 | Introducing Riostream.h | |
23 | ||
a2cb5b3d | 24 | Revision 1.12 2002/10/14 14:57:44 hristov |
25 | Merging the VirtualMC branch to the main development branch (HEAD) | |
26 | ||
b9d0a01d | 27 | Revision 1.8.10.2 2002/07/24 10:09:31 alibrary |
28 | Updating VirtualMC | |
29 | ||
fd621f36 | 30 | RRevision 1.11 2002/06/13 12:09:58 hristov |
b9d0a01d | 31 | Minor corrections |
32 | ||
ca6c93d6 | 33 | Revision 1.10 2002/06/12 09:54:35 cblume |
34 | Update of tracking code provided by Sergei | |
35 | ||
0a29d0f1 | 36 | Revision 1.8 2001/05/30 12:17:47 hristov |
37 | Loop variables declared once | |
38 | ||
3ab6f951 | 39 | Revision 1.7 2001/05/28 17:07:58 hristov |
40 | Last minute changes; ExB correction in AliTRDclusterizerV1; taking into account of material in G10 TEC frames and material between TEC planes (C.Blume,S.Sedykh) | |
41 | ||
2a941f4e | 42 | Revision 1.4 2000/12/08 16:07:02 cblume |
43 | Update of the tracking by Sergei | |
44 | ||
bbf92647 | 45 | Revision 1.3 2000/10/15 23:40:01 cblume |
46 | Remove AliTRDconst | |
47 | ||
0e9c2ad5 | 48 | Revision 1.2 2000/10/06 16:49:46 cblume |
49 | Made Getters const | |
50 | ||
46d29e70 | 51 | Revision 1.1.2.1 2000/09/22 14:47:52 cblume |
52 | Add the tracking code | |
53 | ||
54 | */ | |
55 | ||
a2cb5b3d | 56 | #include <Riostream.h> |
5443e65e | 57 | #include <TObject.h> |
46d29e70 | 58 | |
46d29e70 | 59 | #include "AliTRDgeometry.h" |
60 | #include "AliTRDcluster.h" | |
61 | #include "AliTRDtrack.h" | |
5443e65e | 62 | #include "../TPC/AliTPCtrack.h" |
46d29e70 | 63 | |
b3a5a838 | 64 | |
46d29e70 | 65 | ClassImp(AliTRDtrack) |
66 | ||
67 | ||
68 | //_____________________________________________________________________________ | |
69 | ||
a819a5f7 | 70 | AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index, |
5443e65e | 71 | const Double_t xx[5], const Double_t cc[15], |
72 | Double_t xref, Double_t alpha) : AliKalmanTrack() { | |
46d29e70 | 73 | //----------------------------------------------------------------- |
74 | // This is the main track constructor. | |
75 | //----------------------------------------------------------------- | |
5443e65e | 76 | |
77 | fSeedLab = -1; | |
46d29e70 | 78 | |
79 | fAlpha=alpha; | |
5443e65e | 80 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
81 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
82 | ||
46d29e70 | 83 | fX=xref; |
84 | ||
b3a5a838 | 85 | fY=xx[0]; fZ=xx[1]; fE=xx[2]; fT=xx[3]; fC=xx[4]; |
46d29e70 | 86 | |
87 | fCyy=cc[0]; | |
88 | fCzy=cc[1]; fCzz=cc[2]; | |
b3a5a838 | 89 | fCey=cc[3]; fCez=cc[4]; fCee=cc[5]; |
90 | fCty=cc[6]; fCtz=cc[7]; fCte=cc[8]; fCtt=cc[9]; | |
91 | fCcy=cc[10]; fCcz=cc[11]; fCce=cc[12]; fCct=cc[13]; fCcc=cc[14]; | |
46d29e70 | 92 | |
5443e65e | 93 | fIndex[0]=index; |
94 | SetNumberOfClusters(1); | |
95 | ||
96 | fdEdx=0.; | |
a2b90f83 | 97 | |
b3a5a838 | 98 | fLhElectron = 0.0; |
99 | ||
5443e65e | 100 | Double_t q = TMath::Abs(c->GetQ()); |
a819a5f7 | 101 | Double_t s = fX*fC - fE, t=fT; |
5443e65e | 102 | if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t)); |
103 | ||
104 | fdQdl[0] = q; | |
46d29e70 | 105 | } |
106 | ||
107 | //_____________________________________________________________________________ | |
5443e65e | 108 | AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) { |
46d29e70 | 109 | // |
110 | // Copy constructor. | |
111 | // | |
112 | ||
5443e65e | 113 | SetLabel(t.GetLabel()); |
114 | fSeedLab=t.GetSeedLabel(); | |
46d29e70 | 115 | |
5443e65e | 116 | SetChi2(t.GetChi2()); |
46d29e70 | 117 | fdEdx=t.fdEdx; |
118 | ||
b3a5a838 | 119 | fLhElectron = 0.0; |
120 | ||
46d29e70 | 121 | fAlpha=t.fAlpha; |
122 | fX=t.fX; | |
123 | ||
124 | fY=t.fY; fZ=t.fZ; fC=t.fC; fE=t.fE; fT=t.fT; | |
125 | ||
126 | fCyy=t.fCyy; | |
127 | fCzy=t.fCzy; fCzz=t.fCzz; | |
b3a5a838 | 128 | fCey=t.fCey; fCez=t.fCez; fCee=t.fCee; |
129 | fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt; | |
130 | fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc; | |
46d29e70 | 131 | |
5443e65e | 132 | Int_t n=t.GetNumberOfClusters(); |
133 | SetNumberOfClusters(n); | |
134 | for (Int_t i=0; i<n; i++) { | |
a819a5f7 | 135 | fIndex[i]=t.fIndex[i]; |
136 | fdQdl[i]=t.fdQdl[i]; | |
137 | } | |
5443e65e | 138 | } |
139 | ||
140 | //_____________________________________________________________________________ | |
b3a5a838 | 141 | AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha) |
142 | :AliKalmanTrack(t) { | |
5443e65e | 143 | // |
144 | // Constructor from AliTPCtrack or AliITStrack . | |
145 | // | |
146 | ||
147 | SetLabel(t.GetLabel()); | |
148 | SetChi2(0.); | |
149 | SetNumberOfClusters(0); | |
150 | ||
151 | fdEdx=0; | |
152 | ||
b3a5a838 | 153 | fLhElectron = 0.0; |
154 | ||
5443e65e | 155 | fAlpha = alpha; |
156 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
157 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
158 | ||
159 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
160 | ||
161 | fX=x; | |
162 | ||
163 | x = GetConvConst(); | |
164 | ||
b3a5a838 | 165 | fY=p[0]; |
166 | fZ=p[1]; | |
167 | fT=p[3]; | |
168 | fC=p[4]/x; | |
169 | fE=fX*fC-p[2]; | |
5443e65e | 170 | |
171 | //Conversion of the covariance matrix | |
172 | Double_t c[15]; t.GetExternalCovariance(c); | |
173 | ||
174 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
175 | ||
176 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
177 | Double_t c32=fX*c[13] - c[8]; | |
178 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
179 | ||
b3a5a838 | 180 | fCyy=c[0]; |
181 | fCzy=c[1]; fCzz=c[2]; | |
182 | fCey=c20; fCez=c21; fCee=c22; | |
183 | fCty=c[6]; fCtz=c[7]; fCte=c32; fCtt=c[9]; | |
184 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
5443e65e | 185 | |
186 | } | |
187 | ||
188 | //____________________________________________________________________________ | |
189 | void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
190 | // | |
191 | // This function returns external TRD track representation | |
192 | // | |
193 | xr=fX; | |
194 | x[0]=GetY(); | |
195 | x[1]=GetZ(); | |
196 | x[2]=GetSnp(); | |
197 | x[3]=GetTgl(); | |
198 | x[4]=fC*GetConvConst(); | |
199 | } | |
200 | ||
201 | //_____________________________________________________________________________ | |
202 | void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const { | |
203 | // | |
204 | // This function returns external representation of the covriance matrix. | |
205 | // | |
206 | Double_t a=GetConvConst(); | |
207 | ||
b3a5a838 | 208 | Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee; |
209 | Double_t c32=fX*fCct-fCte; | |
210 | Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce; | |
5443e65e | 211 | |
212 | cc[0 ]=fCyy; | |
213 | cc[1 ]=fCzy; cc[2 ]=fCzz; | |
214 | cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22; | |
215 | cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt; | |
b3a5a838 | 216 | cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a; |
5443e65e | 217 | } |
218 | ||
46d29e70 | 219 | |
220 | //_____________________________________________________________________________ | |
221 | void AliTRDtrack::GetCovariance(Double_t cc[15]) const { | |
222 | cc[0]=fCyy; | |
223 | cc[1]=fCzy; cc[2]=fCzz; | |
b3a5a838 | 224 | cc[3]=fCey; cc[4]=fCez; cc[5]=fCee; |
225 | cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc; | |
226 | cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt; | |
46d29e70 | 227 | } |
228 | ||
229 | //_____________________________________________________________________________ | |
2a941f4e | 230 | Int_t AliTRDtrack::Compare(const TObject *o) const { |
46d29e70 | 231 | |
5443e65e | 232 | // Compares tracks according to their Y2 or curvature |
46d29e70 | 233 | |
234 | AliTRDtrack *t=(AliTRDtrack*)o; | |
235 | // Double_t co=t->GetSigmaY2(); | |
236 | // Double_t c =GetSigmaY2(); | |
237 | ||
238 | Double_t co=TMath::Abs(t->GetC()); | |
239 | Double_t c =TMath::Abs(GetC()); | |
240 | ||
241 | if (c>co) return 1; | |
242 | else if (c<co) return -1; | |
243 | return 0; | |
244 | } | |
245 | ||
a819a5f7 | 246 | //_____________________________________________________________________________ |
247 | void AliTRDtrack::CookdEdx(Double_t low, Double_t up) { | |
248 | //----------------------------------------------------------------- | |
249 | // Calculates dE/dX within the "low" and "up" cuts. | |
250 | //----------------------------------------------------------------- | |
5443e65e | 251 | |
a819a5f7 | 252 | Int_t i; |
5443e65e | 253 | Int_t nc=GetNumberOfClusters(); |
a819a5f7 | 254 | |
5443e65e | 255 | Float_t sorted[kMAX_CLUSTERS_PER_TRACK]; |
256 | for (i=0; i < nc; i++) { | |
257 | sorted[i]=fdQdl[i]; | |
258 | } | |
a819a5f7 | 259 | |
260 | Int_t swap; | |
5443e65e | 261 | |
a819a5f7 | 262 | do { |
263 | swap=0; | |
264 | for (i=0; i<nc-1; i++) { | |
265 | if (sorted[i]<=sorted[i+1]) continue; | |
266 | Float_t tmp=sorted[i]; | |
267 | sorted[i]=sorted[i+1]; sorted[i+1]=tmp; | |
268 | swap++; | |
269 | } | |
270 | } while (swap); | |
271 | ||
272 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); | |
273 | Float_t dedx=0; | |
274 | for (i=nl; i<=nu; i++) dedx += sorted[i]; | |
275 | dedx /= (nu-nl+1); | |
5443e65e | 276 | |
a819a5f7 | 277 | SetdEdx(dedx); |
278 | } | |
279 | ||
280 | ||
281 | ||
fd621f36 | 282 | |
46d29e70 | 283 | //_____________________________________________________________________________ |
b3a5a838 | 284 | Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) |
46d29e70 | 285 | { |
286 | // Propagates a track of particle with mass=pm to a reference plane | |
287 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
288 | ||
5443e65e | 289 | |
46d29e70 | 290 | if (TMath::Abs(fC*xk - fE) >= 0.99999) { |
5443e65e | 291 | Int_t n=GetNumberOfClusters(); |
292 | if (n>4) cerr<<n<<" AliTRDtrack warning: Propagation failed !\n"; | |
46d29e70 | 293 | return 0; |
294 | } | |
295 | ||
296 | Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ; | |
5443e65e | 297 | Double_t c1=fC*x1 - fE; |
298 | if((c1*c1) > 1) return 0; | |
299 | Double_t r1=sqrt(1.- c1*c1); | |
300 | Double_t c2=fC*x2 - fE; | |
301 | if((c2*c2) > 1) return 0; | |
302 | Double_t r2=sqrt(1.- c2*c2); | |
46d29e70 | 303 | |
304 | fY += dx*(c1+c2)/(r1+r2); | |
305 | fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
306 | ||
307 | //f = F - 1 | |
308 | Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2; | |
b3a5a838 | 309 | Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr); |
310 | Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr); | |
46d29e70 | 311 | Double_t cr=c1*r2+c2*r1; |
b3a5a838 | 312 | Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr); |
313 | Double_t f13= dx*cc/cr; | |
314 | Double_t f14= dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr); | |
46d29e70 | 315 | |
316 | //b = C*ft | |
b3a5a838 | 317 | Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty; |
318 | Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz; | |
319 | Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte; | |
320 | Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt; | |
321 | Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct; | |
46d29e70 | 322 | |
323 | //a = f*b = f*C*ft | |
b3a5a838 | 324 | Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31; |
46d29e70 | 325 | |
326 | //F*C*Ft = C + (a + b + bt) | |
327 | fCyy += a00 + 2*b00; | |
328 | fCzy += a01 + b01 + b10; | |
b3a5a838 | 329 | fCey += b20; |
330 | fCty += b30; | |
331 | fCcy += b40; | |
46d29e70 | 332 | fCzz += a11 + 2*b11; |
b3a5a838 | 333 | fCez += b21; |
334 | fCtz += b31; | |
335 | fCcz += b41; | |
46d29e70 | 336 | |
337 | fX=x2; | |
338 | ||
339 | ||
340 | //Multiple scattering ****************** | |
341 | ||
342 | Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ)); | |
343 | Double_t p2=GetPt()*GetPt()*(1.+fT*fT); | |
5443e65e | 344 | p2 = TMath::Min(p2,1e+08); // to avoid division by (1-1) for stiff tracks |
b3a5a838 | 345 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
46d29e70 | 346 | |
347 | Double_t ey=fC*fX - fE, ez=fT; | |
348 | Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey; | |
349 | ||
350 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho; | |
b3a5a838 | 351 | |
46d29e70 | 352 | fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2; |
353 | fCte += ez*zz1*xy*theta2; | |
354 | fCtt += zz1*zz1*theta2; | |
b3a5a838 | 355 | fCce += xz*ez*xy*theta2; |
356 | fCct += xz*zz1*theta2; | |
357 | fCcc += xz*xz*theta2; | |
46d29e70 | 358 | |
359 | ||
360 | //Energy losses************************ | |
5443e65e | 361 | if (x1 < x2) d=-d; |
46d29e70 | 362 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho; |
ca6c93d6 | 363 | //PH SetLength(GetLength()+d); |
5443e65e | 364 | |
365 | cc = fC; | |
b3a5a838 | 366 | fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE); |
5443e65e | 367 | fE+=fX*(fC-cc); |
46d29e70 | 368 | |
369 | return 1; | |
370 | ||
371 | } | |
372 | ||
fd621f36 | 373 | |
46d29e70 | 374 | //_____________________________________________________________________________ |
fd621f36 | 375 | Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01) |
46d29e70 | 376 | { |
377 | // Assignes found cluster to the track and updates track information | |
378 | ||
fd621f36 | 379 | |
380 | Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2()*100.0; | |
381 | ||
382 | r00+=(fCyy+2.0*h01*fCzy+h01*h01*fCzz); | |
383 | r01+=(fCzy+h01*fCzz); | |
384 | r11+=fCzz; | |
385 | ||
46d29e70 | 386 | Double_t det=r00*r11 - r01*r01; |
387 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
388 | ||
fd621f36 | 389 | // Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; |
390 | // Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
b3a5a838 | 391 | // Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; |
392 | // Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
393 | // Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
fd621f36 | 394 | |
395 | Double_t k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
396 | Double_t k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
b3a5a838 | 397 | Double_t k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); |
398 | Double_t k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
399 | Double_t k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
46d29e70 | 400 | |
401 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
fd621f36 | 402 | |
403 | dy=dy+h01*dz; | |
404 | ||
b3a5a838 | 405 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; |
46d29e70 | 406 | if (TMath::Abs(cur*fX-eta) >= 0.99999) { |
b3a5a838 | 407 | Int_t n=GetNumberOfClusters(); |
408 | if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
5443e65e | 409 | return 0; |
46d29e70 | 410 | } |
411 | ||
412 | fY += k00*dy + k01*dz; | |
413 | fZ += k10*dy + k11*dz; | |
46d29e70 | 414 | fE = eta; |
b3a5a838 | 415 | fT += k30*dy + k31*dz; |
416 | fC = cur; | |
46d29e70 | 417 | |
fd621f36 | 418 | |
419 | k01+=h01*k00; | |
420 | k11+=h01*k10; | |
421 | k21+=h01*k20; | |
422 | k31+=h01*k30; | |
423 | k41+=h01*k40; | |
424 | ||
b3a5a838 | 425 | Double_t c01=fCzy, c02=fCey, c03=fCty, c04=fCcy; |
426 | Double_t c12=fCez, c13=fCtz, c14=fCcz; | |
46d29e70 | 427 | |
428 | fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz; | |
b3a5a838 | 429 | fCey-=k00*c02+k01*c12; fCty-=k00*c03+k01*c13; |
430 | fCcy-=k00*c04+k01*c14; | |
46d29e70 | 431 | |
432 | fCzz-=k10*c01+k11*fCzz; | |
b3a5a838 | 433 | fCez-=k10*c02+k11*c12; fCtz-=k10*c03+k11*c13; |
434 | fCcz-=k10*c04+k11*c14; | |
46d29e70 | 435 | |
b3a5a838 | 436 | fCee-=k20*c02+k21*c12; fCte-=k20*c03+k21*c13; |
437 | fCce-=k20*c04+k21*c14; | |
46d29e70 | 438 | |
b3a5a838 | 439 | fCtt-=k30*c03+k31*c13; |
440 | fCct-=k40*c03+k41*c13; | |
46d29e70 | 441 | |
b3a5a838 | 442 | fCcc-=k40*c04+k41*c14; |
46d29e70 | 443 | |
5443e65e | 444 | Int_t n=GetNumberOfClusters(); |
445 | fIndex[n]=index; | |
446 | SetNumberOfClusters(n+1); | |
46d29e70 | 447 | |
5443e65e | 448 | SetChi2(GetChi2()+chisq); |
fd621f36 | 449 | |
46d29e70 | 450 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; |
5443e65e | 451 | |
452 | return 1; | |
fd621f36 | 453 | |
46d29e70 | 454 | } |
455 | ||
fd621f36 | 456 | |
46d29e70 | 457 | //_____________________________________________________________________________ |
458 | Int_t AliTRDtrack::Rotate(Double_t alpha) | |
459 | { | |
460 | // Rotates track parameters in R*phi plane | |
461 | ||
462 | fAlpha += alpha; | |
b3a5a838 | 463 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
464 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
46d29e70 | 465 | |
466 | Double_t x1=fX, y1=fY; | |
467 | Double_t ca=cos(alpha), sa=sin(alpha); | |
468 | Double_t r1=fC*fX - fE; | |
469 | ||
5443e65e | 470 | if (TMath::Abs(r1) >= 0.99999) { |
471 | Int_t n=GetNumberOfClusters(); | |
472 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; | |
473 | return 0; | |
474 | } | |
475 | ||
46d29e70 | 476 | fX = x1*ca + y1*sa; |
477 | fY=-x1*sa + y1*ca; | |
478 | fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa; | |
479 | ||
480 | Double_t r2=fC*fX - fE; | |
481 | if (TMath::Abs(r2) >= 0.99999) { | |
5443e65e | 482 | Int_t n=GetNumberOfClusters(); |
483 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; | |
46d29e70 | 484 | return 0; |
485 | } | |
486 | ||
487 | Double_t y0=fY + sqrt(1.- r2*r2)/fC; | |
488 | if ((fY-y0)*fC >= 0.) { | |
5443e65e | 489 | Int_t n=GetNumberOfClusters(); |
490 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n"; | |
46d29e70 | 491 | return 0; |
492 | } | |
493 | ||
494 | //f = F - 1 | |
b3a5a838 | 495 | Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa, |
496 | f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1; | |
46d29e70 | 497 | |
498 | //b = C*ft | |
b3a5a838 | 499 | Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22; |
500 | Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22; | |
501 | Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22; | |
502 | Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22; | |
503 | Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22; | |
46d29e70 | 504 | |
505 | //a = f*b = f*C*ft | |
b3a5a838 | 506 | Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22; |
46d29e70 | 507 | |
508 | // *** Double_t dy2=fCyy; | |
509 | ||
510 | //F*C*Ft = C + (a + b + bt) | |
511 | fCyy += a00 + 2*b00; | |
512 | fCzy += b10; | |
b3a5a838 | 513 | fCey += a02+b20+b02; |
514 | fCty += b30; | |
515 | fCcy += b40; | |
516 | fCez += b12; | |
517 | fCte += b32; | |
518 | fCee += a22 + 2*b22; | |
519 | fCce += b42; | |
46d29e70 | 520 | |
521 | // *** fCyy+=dy2*sa*sa*r1*r1/(1.- r1*r1); | |
522 | // *** fCzz+=d2y*sa*sa*fT*fT/(1.- r1*r1); | |
523 | ||
524 | return 1; | |
525 | } | |
526 | ||
527 | ||
46d29e70 | 528 | //_____________________________________________________________________________ |
fd621f36 | 529 | Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const |
46d29e70 | 530 | { |
fd621f36 | 531 | |
a819a5f7 | 532 | Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2(); |
fd621f36 | 533 | |
46d29e70 | 534 | r00+=fCyy; r01+=fCzy; r11+=fCzz; |
535 | ||
536 | Double_t det=r00*r11 - r01*r01; | |
537 | if (TMath::Abs(det) < 1.e-10) { | |
fd621f36 | 538 | Int_t n=GetNumberOfClusters(); |
539 | if (n>4) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n"; | |
46d29e70 | 540 | return 1e10; |
541 | } | |
542 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
543 | ||
544 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
545 | ||
fd621f36 | 546 | dy=dy+h01*dz; |
a819a5f7 | 547 | |
fd621f36 | 548 | return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; |
a819a5f7 | 549 | |
fd621f36 | 550 | } |
46d29e70 | 551 | |
552 | ||
553 | //_________________________________________________________________________ | |
554 | void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const | |
555 | { | |
556 | // Returns reconstructed track momentum in the global system. | |
557 | ||
558 | Double_t pt=TMath::Abs(GetPt()); // GeV/c | |
559 | Double_t r=fC*fX-fE; | |
5443e65e | 560 | |
561 | Double_t y0; | |
562 | if(r > 1) { py = pt; px = 0; } | |
563 | else if(r < -1) { py = -pt; px = 0; } | |
564 | else { | |
565 | y0=fY + sqrt(1.- r*r)/fC; | |
566 | px=-pt*(fY-y0)*fC; //cos(phi); | |
567 | py=-pt*(fE-fX*fC); //sin(phi); | |
568 | } | |
46d29e70 | 569 | pz=pt*fT; |
570 | Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha); | |
571 | py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha); | |
572 | px=tmp; | |
573 | ||
574 | } | |
575 | ||
5443e65e | 576 | //_________________________________________________________________________ |
577 | void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const | |
46d29e70 | 578 | { |
5443e65e | 579 | // Returns reconstructed track coordinates in the global system. |
580 | ||
581 | x = fX; y = fY; z = fZ; | |
582 | Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha); | |
583 | y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha); | |
584 | x=tmp; | |
585 | ||
586 | } | |
3ab6f951 | 587 | |
5443e65e | 588 | //_________________________________________________________________________ |
589 | void AliTRDtrack::ResetCovariance() { | |
590 | // | |
591 | // Resets covariance matrix | |
592 | // | |
46d29e70 | 593 | |
5443e65e | 594 | fCyy*=10.; |
595 | fCzy=0.; fCzz*=10.; | |
b3a5a838 | 596 | fCey=0.; fCez=0.; fCee*=10.; |
597 | fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.; | |
598 | fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.; | |
46d29e70 | 599 | |
5443e65e | 600 | } |