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74ea065c | 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 | **************************************************************************/ | |
2c770f53 | 15 | //////////////////////////////////////////////////////////////////////// |
16 | // | |
17 | // AliTOFtrack class | |
18 | // | |
19 | // Authors: Bologna-CERN-ITEP-Salerno Group | |
20 | // | |
21 | // Description: class for handling ESD extracted tracks for TOF matching. | |
74ea065c | 22 | /* $Id$ */ |
23 | ||
24 | #include <Riostream.h> | |
d3c7bfac | 25 | |
74ea065c | 26 | #include <TObject.h> |
d3c7bfac | 27 | |
d076c8d5 | 28 | #include "AliLog.h" |
74ea065c | 29 | #include "AliESDtrack.h" |
30 | ||
d3c7bfac | 31 | #include "AliTOFGeometry.h" |
32 | #include "AliTOFGeometryV4.h" | |
33 | #include "AliTOFGeometryV5.h" | |
34 | #include "AliTOFtrack.h" | |
35 | ||
74ea065c | 36 | ClassImp(AliTOFtrack) |
37 | ||
38 | //_____________________________________________________________________________ | |
39 | AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) : AliKalmanTrack(t) { | |
40 | // | |
41 | // Copy constructor. | |
42 | // | |
43 | ||
44 | SetSeedIndex(t.GetSeedIndex()); | |
45 | SetLabel(t.GetLabel()); | |
46 | fSeedLab=t.GetSeedLabel(); | |
47 | SetChi2(t.GetChi2()); | |
48 | ||
49 | fAlpha=t.fAlpha; | |
50 | fX=t.fX; | |
51 | ||
52 | fY=t.fY; fZ=t.fZ; fE=t.fE; fT=t.fT; fC=t.fC; | |
53 | ||
54 | fCyy=t.fCyy; | |
55 | fCzy=t.fCzy; fCzz=t.fCzz; | |
56 | fCey=t.fCey; fCez=t.fCez; fCee=t.fCee; | |
57 | fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt; | |
58 | fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc; | |
59 | ||
d3c7bfac | 60 | fTOFgeometry = new AliTOFGeometryV4(); |
74ea065c | 61 | |
62 | } | |
63 | ||
64 | //_____________________________________________________________________________ | |
65 | AliTOFtrack::AliTOFtrack(const AliESDtrack& t) | |
66 | :AliKalmanTrack() { | |
67 | // | |
68 | // Constructor from AliESDtrack | |
69 | // | |
70 | ||
d3c7bfac | 71 | fTOFgeometry = new AliTOFGeometryV4(); |
72 | ||
74ea065c | 73 | SetSeedIndex(-1); |
74 | SetLabel(t.GetLabel()); | |
75 | SetChi2(0.); | |
76 | SetMass(t.GetMass()); | |
77 | ||
78 | fAlpha = t.GetAlpha(); | |
79 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
80 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
81 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
82 | ||
83 | fX=x; | |
84 | ||
74ea065c | 85 | fY=p[0]; |
c84a5e9e | 86 | fZ=p[1]; SaveLocalConvConst(); |
87 | fT=p[3]; x=GetLocalConvConst(); | |
74ea065c | 88 | fC=p[4]/x; |
89 | fE=fC*fX - p[2]; | |
90 | ||
91 | //Conversion of the covariance matrix | |
92 | Double_t c[15]; t.GetExternalCovariance(c); | |
93 | ||
94 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
95 | ||
96 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
97 | Double_t c32=fX*c[13] - c[8]; | |
98 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
99 | ||
100 | fCyy=c[0 ]; | |
101 | fCzy=c[1 ]; fCzz=c[2 ]; | |
102 | fCey=c20; fCez=c21; fCee=c22; | |
103 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
104 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
105 | ||
106 | if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return; | |
107 | StartTimeIntegral(); | |
108 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
109 | SetIntegratedLength(t.GetIntegratedLength()); | |
110 | ||
111 | ||
112 | } | |
113 | //____________________________________________________________________________ | |
114 | void AliTOFtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
115 | // | |
116 | // This function returns external TOF track representation | |
117 | // | |
118 | xr=fX; | |
119 | x[0]=GetY(); | |
120 | x[1]=GetZ(); | |
121 | x[2]=GetSnp(); | |
122 | x[3]=GetTgl(); | |
123 | x[4]=Get1Pt(); | |
124 | } | |
125 | ||
126 | //_____________________________________________________________________________ | |
127 | void AliTOFtrack::GetExternalCovariance(Double_t cc[15]) const { | |
128 | // | |
129 | // This function returns external representation of the covriance matrix. | |
130 | // | |
c84a5e9e | 131 | Double_t a=GetLocalConvConst(); |
74ea065c | 132 | Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee; |
133 | Double_t c32=fX*fCct-fCte; | |
134 | Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce; | |
135 | ||
136 | cc[0 ]=fCyy; | |
137 | cc[1 ]=fCzy; cc[2 ]=fCzz; | |
138 | cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22; | |
139 | cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt; | |
140 | cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a; | |
141 | ||
142 | } | |
143 | ||
144 | ||
145 | //_____________________________________________________________________________ | |
146 | void AliTOFtrack::GetCovariance(Double_t cc[15]) const { | |
2c770f53 | 147 | // |
148 | // Returns the covariance matrix. | |
149 | // | |
74ea065c | 150 | |
151 | cc[0]=fCyy; | |
152 | cc[1]=fCzy; cc[2]=fCzz; | |
153 | cc[3]=fCey; cc[4]=fCez; cc[5]=fCee; | |
154 | cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc; | |
155 | cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt; | |
156 | ||
157 | } | |
158 | ||
159 | ||
160 | //_____________________________________________________________________________ | |
161 | Int_t AliTOFtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) | |
162 | { | |
163 | // Propagates a track of particle with mass=pm to a reference plane | |
164 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
165 | ||
166 | if (xk == fX) return 1; | |
167 | ||
168 | if (TMath::Abs(fC*xk - fE) >= 0.90000) { | |
169 | return 0; | |
170 | } | |
c84a5e9e | 171 | Double_t lcc=GetLocalConvConst(); |
74ea065c | 172 | |
173 | // track Length measurement [SR, GSI, 17.02.2003] | |
174 | ||
175 | Double_t oldX = fX, oldY = fY, oldZ = fZ; | |
176 | ||
177 | Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ; | |
178 | Double_t c1=fC*x1 - fE; | |
179 | if((c1*c1) > 1){ | |
180 | return 0;} | |
181 | Double_t r1=sqrt(1.- c1*c1); | |
182 | Double_t c2=fC*x2 - fE; | |
183 | if((c2*c2) > 1) { | |
184 | return 0; | |
185 | } | |
186 | Double_t r2=sqrt(1.- c2*c2); | |
187 | ||
188 | fY += dx*(c1+c2)/(r1+r2); | |
189 | fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
190 | ||
191 | //f = F - 1 | |
192 | Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2; | |
193 | Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr); | |
194 | Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr); | |
195 | Double_t cr=c1*r2+c2*r1; | |
196 | Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr); | |
197 | Double_t f13= dx*cc/cr; | |
198 | Double_t f14=dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr); | |
199 | ||
200 | //b = C*ft | |
201 | Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty; | |
202 | Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz; | |
203 | Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte; | |
204 | Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt; | |
205 | Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct; | |
206 | ||
207 | //a = f*b = f*C*ft | |
208 | Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31; | |
209 | ||
210 | //F*C*Ft = C + (a + b + bt) | |
211 | fCyy += a00 + 2*b00; | |
212 | fCzy += a01 + b01 + b10; | |
213 | fCey += b20; | |
214 | fCty += b30; | |
215 | fCcy += b40; | |
216 | fCzz += a11 + 2*b11; | |
217 | fCez += b21; | |
218 | fCtz += b31; | |
219 | fCcz += b41; | |
220 | ||
221 | fX=x2; | |
222 | ||
c84a5e9e | 223 | //Change of the magnetic field ************* |
224 | SaveLocalConvConst(); | |
225 | cc=fC; | |
226 | fC*=lcc/GetLocalConvConst(); | |
227 | fE+=fX*(fC-cc); | |
228 | ||
74ea065c | 229 | //Multiple scattering ****************** |
230 | Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ)); | |
231 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
232 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); | |
233 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho; | |
234 | ||
235 | Double_t ey=fC*fX - fE, ez=fT; | |
236 | Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey; | |
237 | ||
238 | fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2; | |
239 | fCte += ez*zz1*xy*theta2; | |
240 | fCtt += zz1*zz1*theta2; | |
241 | fCce += xz*ez*xy*theta2; | |
242 | fCct += xz*zz1*theta2; | |
243 | fCcc += xz*xz*theta2; | |
244 | /* | |
245 | Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2; | |
246 | Double_t dc32 = (xz*fX*zz1)*theta2; | |
247 | Double_t dc33 = (zz1*zz1)*theta2; | |
248 | Double_t dc42 = (xz*fX*xz)*theta2; | |
249 | Double_t dc43 = (zz1*xz)*theta2; | |
250 | Double_t dc44 = (xz*xz)*theta2; | |
251 | fCee += dc22; | |
252 | fCte += dc32; | |
253 | fCtt += dc33; | |
254 | fCce += dc42; | |
255 | fCct += dc43; | |
256 | fCcc += dc44; | |
257 | */ | |
258 | //Energy losses************************ | |
259 | if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;} | |
260 | ||
261 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho; | |
983ebc4f | 262 | // |
263 | // suspicious part - think about it ? | |
264 | Double_t kinE = TMath::Sqrt(p2); | |
265 | if (dE>0.8*kinE) dE = 0.8*kinE; // | |
266 | if (dE<0) dE = 0.0; // not valid region for Bethe bloch | |
267 | // | |
268 | // | |
74ea065c | 269 | if (x1 < x2) dE=-dE; |
270 | cc=fC; | |
271 | fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE); | |
272 | fE+=fX*(fC-cc); | |
273 | ||
274 | // track time measurement [SR, GSI 17.02.2002] | |
275 | if (x1 < x2) | |
276 | if (IsStartedTimeIntegral()) { | |
277 | Double_t l2 = (fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY) + (fZ-oldZ)*(fZ-oldZ); | |
278 | AddTimeStep(TMath::Sqrt(l2)); | |
279 | } | |
280 | ||
281 | return 1; | |
282 | } | |
283 | ||
284 | //_____________________________________________________________________________ | |
285 | Int_t AliTOFtrack::PropagateToInnerTOF( Bool_t holes) | |
286 | { | |
287 | // Propagates a track of particle with mass=pm to a reference plane | |
288 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
289 | ||
290 | ||
d3c7bfac | 291 | Double_t ymax=fTOFgeometry->RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha()); |
74ea065c | 292 | Bool_t skip = kFALSE; |
d3c7bfac | 293 | Double_t y=GetYat(fTOFgeometry->RinTOF(),skip); |
74ea065c | 294 | if(skip){ |
295 | return 0; | |
296 | } | |
297 | if (y > ymax) { | |
2c770f53 | 298 | if (!Rotate(AliTOFGeometry::GetAlpha())) { |
74ea065c | 299 | return 0; |
300 | } | |
301 | } else if (y <-ymax) { | |
2c770f53 | 302 | if (!Rotate(-AliTOFGeometry::GetAlpha())) { |
74ea065c | 303 | return 0; |
304 | } | |
305 | } | |
306 | ||
307 | ||
2c770f53 | 308 | Double_t x = GetX(); |
74ea065c | 309 | Int_t nsteps=Int_t((370.-x)/0.5); // 0.5 cm Steps |
310 | for (Int_t istep=0;istep<nsteps;istep++){ | |
311 | Float_t xp = x+istep*0.5; | |
312 | Double_t param[2]; | |
2c770f53 | 313 | GetPropagationParameters(holes,param); |
314 | PropagateTo(xp,param[0],param[1]); | |
74ea065c | 315 | |
316 | } | |
317 | ||
d3c7bfac | 318 | if(!PropagateTo(fTOFgeometry->RinTOF()))return 0; |
74ea065c | 319 | |
320 | return 1; | |
321 | ||
322 | } | |
323 | ||
324 | //_____________________________________________________________________________ | |
325 | Int_t AliTOFtrack::Rotate(Double_t alpha) | |
326 | { | |
327 | // Rotates track parameters in R*phi plane | |
328 | ||
329 | ||
330 | fAlpha += alpha; | |
331 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
332 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
333 | ||
334 | Double_t x1=fX, y1=fY; | |
335 | Double_t ca=cos(alpha), sa=sin(alpha); | |
336 | Double_t r1=fC*fX - fE; | |
337 | ||
338 | fX = x1*ca + y1*sa; | |
339 | fY =-x1*sa + y1*ca; | |
340 | if((r1*r1) > 1) return 0; | |
341 | fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa; | |
342 | ||
343 | Double_t r2=fC*fX - fE; | |
344 | if (TMath::Abs(r2) >= 0.90000) { | |
d076c8d5 | 345 | AliWarning("Rotation failed !"); |
74ea065c | 346 | return 0; |
347 | } | |
348 | ||
349 | if((r2*r2) > 1) return 0; | |
350 | Double_t y0=fY + sqrt(1.- r2*r2)/fC; | |
351 | if ((fY-y0)*fC >= 0.) { | |
d076c8d5 | 352 | AliWarning("Rotation failed !!!"); |
74ea065c | 353 | return 0; |
354 | } | |
355 | ||
356 | //f = F - 1 | |
357 | Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa, | |
358 | f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1; | |
359 | ||
360 | //b = C*ft | |
361 | Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22; | |
362 | Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22; | |
363 | Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22; | |
364 | Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22; | |
365 | Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22; | |
366 | ||
367 | //a = f*b = f*C*ft | |
368 | Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22; | |
369 | ||
370 | //F*C*Ft = C + (a + b + bt) | |
371 | fCyy += a00 + 2*b00; | |
372 | fCzy += b10; | |
373 | fCey += a02+b20+b02; | |
374 | fCty += b30; | |
375 | fCcy += b40; | |
376 | fCez += b12; | |
377 | fCte += b32; | |
378 | fCee += a22 + 2*b22; | |
379 | fCce += b42; | |
380 | ||
381 | return 1; | |
382 | } | |
383 | ||
2c770f53 | 384 | //_________________________________________________________________________ |
4668c628 | 385 | Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const { |
2c770f53 | 386 | //----------------------------------------------------------------- |
387 | // This function calculates the Y-coordinate of a track at the plane x=xk. | |
388 | // Needed for matching with the TOF (I.Belikov) | |
389 | //----------------------------------------------------------------- | |
390 | skip=kFALSE; | |
391 | Double_t c1=fC*fX - fE, r1=TMath::Sqrt(TMath::Abs(1.- c1*c1)); | |
392 | Double_t c2=fC*xk - fE, r2=TMath::Sqrt(TMath::Abs(1.- c2*c2)); | |
393 | if( ((1.- c2*c2)<0) || ((1.- c1*c1)<0) ) skip=kTRUE; | |
394 | return fY + (xk-fX)*(c1+c2)/(r1+r2); | |
395 | } | |
74ea065c | 396 | //_________________________________________________________________________ |
397 | void AliTOFtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const | |
398 | { | |
399 | // Returns reconstructed track momentum in the global system. | |
400 | ||
401 | Double_t pt=TMath::Abs(GetPt()); // GeV/c | |
402 | Double_t r=fC*fX-fE; | |
403 | ||
404 | Double_t y0; | |
405 | if(r > 1) { py = pt; px = 0; } | |
406 | else if(r < -1) { py = -pt; px = 0; } | |
407 | else { | |
408 | y0=fY + sqrt(1.- r*r)/fC; | |
409 | px=-pt*(fY-y0)*fC; //cos(phi); | |
410 | py=-pt*(fE-fX*fC); //sin(phi); | |
411 | } | |
412 | pz=pt*fT; | |
413 | Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha); | |
414 | py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha); | |
415 | px=tmp; | |
416 | ||
417 | } | |
418 | ||
419 | //_________________________________________________________________________ | |
420 | void AliTOFtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const | |
421 | { | |
422 | // Returns reconstructed track coordinates in the global system. | |
423 | ||
424 | x = fX; y = fY; z = fZ; | |
425 | Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha); | |
426 | y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha); | |
427 | x=tmp; | |
428 | ||
429 | } | |
430 | ||
431 | //_________________________________________________________________________ | |
432 | void AliTOFtrack::ResetCovariance() { | |
433 | // | |
434 | // Resets covariance matrix | |
435 | // | |
436 | ||
437 | fCyy*=10.; | |
438 | fCzy=0.; fCzz*=10.; | |
439 | fCey=0.; fCez=0.; fCee*=10.; | |
440 | fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.; | |
441 | fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.; | |
442 | } | |
443 | ||
444 | ||
445 | //_________________________________________________________________________ | |
446 | void AliTOFtrack::ResetCovariance(Float_t mult) { | |
447 | // | |
448 | // Resets covariance matrix | |
449 | // | |
450 | ||
451 | fCyy*=mult; | |
452 | fCzy*=0.; fCzz*=mult; | |
453 | fCey*=0.; fCez*=0.; fCee*=mult; | |
454 | fCty*=0.; fCtz*=0.; fCte*=0.; fCtt*=mult; | |
455 | fCcy*=0.; fCcz*=0.; fCce*=0.; fCct*=0.; fCcc*=mult; | |
456 | } | |
457 | ||
458 | //_____________________________________________________________________________ | |
459 | Int_t AliTOFtrack::Compare(const TObject *o) const { | |
460 | //----------------------------------------------------------------- | |
461 | // This function compares tracks according to the their curvature | |
462 | //----------------------------------------------------------------- | |
463 | AliTOFtrack *t=(AliTOFtrack*)o; | |
464 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); | |
465 | Double_t c =GetSigmaY2()*GetSigmaZ2(); | |
466 | if (c>co) return 1; | |
467 | else if (c<co) return -1; | |
468 | return 0; | |
469 | } | |
470 | ||
471 | //_____________________________________________________________________________ | |
472 | void AliTOFtrack::GetPropagationParameters(Bool_t holes, Double_t *param) { | |
473 | ||
2c770f53 | 474 | //Get average medium density, x0 while propagating the track |
475 | ||
476 | //For TRD holes description | |
74ea065c | 477 | |
478 | Double_t thetamin = (90.-31.1) * TMath::Pi()/180.; | |
479 | Double_t thetamax = (90.+31.1) * TMath::Pi()/180.; | |
480 | ||
481 | Double_t zmin = -55.; | |
482 | Double_t zmax = 55.; | |
483 | ||
2c770f53 | 484 | // Detector inner/outer radii |
74ea065c | 485 | Double_t rTPC = 261.53; |
486 | Double_t rTPCTRD = 294.5; | |
487 | Double_t rTRD = 369.1; | |
488 | ||
2c770f53 | 489 | // Medium parameters |
74ea065c | 490 | Double_t x0TPC = 40.; |
491 | Double_t rhoTPC =0.06124; | |
492 | ||
493 | Double_t x0Air = 36.66; | |
494 | Double_t rhoAir =1.2931e-3; | |
495 | ||
496 | Double_t x0TRD = 171.7; | |
497 | Double_t rhoTRD =0.33; | |
498 | ||
2c770f53 | 499 | Int_t isec = GetSector(); |
74ea065c | 500 | Double_t xtr,ytr,ztr; |
2c770f53 | 501 | GetGlobalXYZ(xtr,ytr,ztr); |
74ea065c | 502 | Float_t thetatr = TMath::ATan2(TMath::Sqrt(xtr*xtr+ytr*ytr),ztr); |
503 | ||
504 | if(holes){ | |
505 | if (isec == 0 || isec == 1 || isec == 2 ) { | |
506 | if( thetatr>=thetamin && thetatr<=thetamax){ | |
507 | x0TRD= x0Air; | |
508 | rhoTRD = rhoAir; | |
509 | } | |
510 | } | |
511 | if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) { | |
512 | if( ztr>=zmin && ztr<=zmax){ | |
513 | x0TRD= x0Air; | |
514 | rhoTRD = rhoAir; | |
515 | } | |
516 | } | |
517 | } | |
518 | ||
2c770f53 | 519 | if(GetX() <= rTPC) |
74ea065c | 520 | {param[0]=x0TPC;param[1]=rhoTPC;} |
2c770f53 | 521 | else if(GetX() > rTPC && GetX() < rTPCTRD) |
74ea065c | 522 | {param[0]=x0Air;param[1]=rhoAir;} |
2c770f53 | 523 | else if(GetX() >= rTPCTRD && GetX() < rTRD) |
74ea065c | 524 | {param[0]=x0TRD;param[1]=rhoTRD;} |
2c770f53 | 525 | else if(GetX() >= rTRD ) |
74ea065c | 526 | {param[0]=x0Air;param[1]=rhoAir;} |
74ea065c | 527 | } |