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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 | **************************************************************************/ | |
74ea065c | 15 | |
0e46b9ae | 16 | /* $Id$ */ |
d3c7bfac | 17 | |
0e46b9ae | 18 | ///////////////////////////////////////////////////////////////////////////// |
19 | // // | |
20 | // AliTOFtrack class // | |
21 | // // | |
22 | // Authors: Bologna-CERN-ITEP-Salerno Group // | |
23 | // // | |
24 | // Description: class for handling ESD extracted tracks for TOF matching. // | |
25 | // // | |
26 | ///////////////////////////////////////////////////////////////////////////// | |
d3c7bfac | 27 | |
74ea065c | 28 | #include "AliESDtrack.h" |
6c94f330 | 29 | #include "AliTracker.h" |
74ea065c | 30 | |
0e46b9ae | 31 | #include "AliTOFGeometry.h" |
d3c7bfac | 32 | #include "AliTOFtrack.h" |
33 | ||
74ea065c | 34 | ClassImp(AliTOFtrack) |
35 | ||
36 | //_____________________________________________________________________________ | |
655e379f | 37 | AliTOFtrack::AliTOFtrack() : |
38 | AliKalmanTrack(), | |
39 | fSeedInd(-1), | |
ba66add8 | 40 | fSeedLab(-1) |
6c94f330 | 41 | { |
74ea065c | 42 | // |
6c94f330 | 43 | // Default constructor. |
74ea065c | 44 | // |
6c94f330 | 45 | } |
74ea065c | 46 | |
6c94f330 | 47 | //_____________________________________________________________________________ |
48 | AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) : | |
49 | AliKalmanTrack(t), | |
50 | fSeedInd(t.fSeedInd), | |
ba66add8 | 51 | fSeedLab(t.fSeedLab) |
6c94f330 | 52 | { |
53 | // | |
54 | // Copy constructor. | |
55 | // | |
74ea065c | 56 | } |
57 | ||
986d445d | 58 | //____________________________________________________________________________ |
59 | AliTOFtrack& AliTOFtrack::operator=(const AliESDtrack& t) | |
60 | { | |
61 | // ass. op. | |
62 | SetLabel(t.GetLabel()); | |
63 | SetChi2(0.); | |
64 | SetMass(t.GetMassForTracking()); | |
65 | ||
66 | Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance()); | |
67 | ||
68 | if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return *this; | |
69 | StartTimeIntegral(); | |
70 | Double_t times[10]; | |
71 | for(Int_t isp=0;isp<AliPID::kSPECIESC;isp++){ | |
72 | times[isp] = t.GetIntegratedTimesOld(isp); // in ps | |
73 | } | |
74 | ||
75 | SetIntegratedTimes(times); | |
76 | SetIntegratedLength(t.GetIntegratedLengthOld()); | |
77 | ||
78 | return *this; | |
79 | ||
80 | } | |
81 | ||
74ea065c | 82 | //_____________________________________________________________________________ |
6c94f330 | 83 | AliTOFtrack::AliTOFtrack(const AliESDtrack& t) : |
84 | AliKalmanTrack(), | |
655e379f | 85 | fSeedInd(-1), |
ba66add8 | 86 | fSeedLab(-1) |
6c94f330 | 87 | { |
74ea065c | 88 | // |
89 | // Constructor from AliESDtrack | |
90 | // | |
74ea065c | 91 | SetLabel(t.GetLabel()); |
92 | SetChi2(0.); | |
1d26da6d | 93 | SetMass(t.GetMassForTracking()); |
74ea065c | 94 | |
6c94f330 | 95 | Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance()); |
74ea065c | 96 | |
97 | if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return; | |
98 | StartTimeIntegral(); | |
115179c6 | 99 | Double_t times[10]; |
100 | for(Int_t isp=0;isp<AliPID::kSPECIESC;isp++){ | |
101 | times[isp] = t.GetIntegratedTimesOld(isp); // in ps | |
102 | } | |
103 | ||
104 | SetIntegratedTimes(times); | |
105 | SetIntegratedLength(t.GetIntegratedLengthOld()); | |
74ea065c | 106 | |
74ea065c | 107 | } |
7aeeaf38 | 108 | |
109 | //____________________________________________________________________________ | |
2f584d46 | 110 | AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/*source*/) |
7aeeaf38 | 111 | { |
112 | // ass. op. | |
113 | ||
7aeeaf38 | 114 | return *this; |
115 | ||
116 | } | |
117 | ||
74ea065c | 118 | //_____________________________________________________________________________ |
35b6d6a6 | 119 | Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t /*x0*/,Double_t /*rho*/) |
18f005ac | 120 | { |
121 | // | |
74ea065c | 122 | // Propagates a track of particle with mass=pm to a reference plane |
123 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
18f005ac | 124 | // |
74ea065c | 125 | |
6c94f330 | 126 | if (xk == GetX()) return kTRUE; |
74ea065c | 127 | |
35b6d6a6 | 128 | Double_t oldX=GetX();//, oldY=GetY(), oldZ=GetZ(); |
129 | Double_t start[3], end[3], mparam[7]; | |
74ea065c | 130 | |
5a388465 | 131 | /* get start position */ |
132 | GetXYZ(start); | |
133 | ||
134 | /* propagate the track */ | |
c4eac485 | 135 | Double_t b[3];GetBxByBz(b); |
136 | if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE; | |
137 | // OLD used code | |
138 | //Double_t bz=GetBz(); | |
139 | //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE; | |
74ea065c | 140 | |
5a388465 | 141 | /* get end position */ |
142 | GetXYZ(end); | |
143 | ||
144 | /* add time step to integral */ | |
145 | #if 0 /*** OLD ***/ | |
6c94f330 | 146 | Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) + |
147 | (GetY()-oldY)*(GetY()-oldY) + | |
148 | (GetZ()-oldZ)*(GetZ()-oldZ)); | |
149 | if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d); | |
5a388465 | 150 | #endif |
151 | Double_t d = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0]) + | |
152 | (end[1]-start[1])*(end[1]-start[1]) + | |
153 | (end[2]-start[2])*(end[2]-start[2])); | |
154 | if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d); | |
155 | ||
156 | /* get material budget from tracker */ | |
157 | AliTracker::MeanMaterialBudget(start, end, mparam); | |
158 | Double_t xTimesRho = mparam[4]*mparam[0]; | |
78c25bbc | 159 | if (oldX < xk) { // CZ |
160 | xTimesRho = -xTimesRho; // it should be negative in case of outward | |
161 | // propagation (--> energy decreases) | |
162 | } // CZ | |
5a388465 | 163 | Double_t xOverX0 = mparam[1]; |
6c94f330 | 164 | |
5a388465 | 165 | /* correct for mean material */ |
166 | if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,xTimesRho,GetMass())) return kFALSE; | |
167 | ||
168 | ||
169 | #if 0 /*** OLD ***/ | |
6c94f330 | 170 | if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass())) |
171 | return kFALSE; | |
5a388465 | 172 | #endif |
74ea065c | 173 | |
74ea065c | 174 | /* |
74ea065c | 175 | //Energy losses************************ |
176 | if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;} | |
177 | ||
178 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho; | |
983ebc4f | 179 | // |
180 | // suspicious part - think about it ? | |
181 | Double_t kinE = TMath::Sqrt(p2); | |
182 | if (dE>0.8*kinE) dE = 0.8*kinE; // | |
183 | if (dE<0) dE = 0.0; // not valid region for Bethe bloch | |
6c94f330 | 184 | */ |
74ea065c | 185 | |
6c94f330 | 186 | return kTRUE; |
74ea065c | 187 | } |
188 | ||
189 | //_____________________________________________________________________________ | |
ba4161e8 | 190 | Bool_t AliTOFtrack::PropagateToInnerTOF() |
74ea065c | 191 | { |
192 | // Propagates a track of particle with mass=pm to a reference plane | |
193 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
194 | ||
78c25bbc | 195 | //const Double_t kAlphac = TMath::Pi()/9.0; // 20 degree |
196 | const Double_t kAlphac = AliTOFGeometry::GetAlpha(); // 20 degree | |
197 | const Double_t kTalphac = TMath::Tan(kAlphac*0.5); | |
198 | ||
199 | //const Double_t kStepSize = 0.1; // [cm] Step size | |
200 | const Double_t kStepSize = 0.5; // [cm] Step size | |
201 | ||
202 | Double_t x = GetX(); | |
203 | //Double_t bz = GetBz(); | |
204 | ||
205 | //Double_t xyz0[3]; | |
206 | //Double_t xyz1[3]; | |
207 | //Double_t y; | |
208 | //Double_t z; | |
209 | ||
210 | Int_t nsteps = (Int_t)((AliTOFGeometry::Rmin()-x)/kStepSize); | |
211 | for (Int_t istep=0; istep<nsteps; istep++){ | |
212 | ||
213 | // Critical alpha - cross sector indication | |
214 | ||
215 | Double_t dir = (GetX() > AliTOFGeometry::Rmin()) ? -1.0 : 1.0; | |
216 | ||
217 | x = GetX()+dir*kStepSize; | |
218 | if ( x<GetX() && GetX()<AliTOFGeometry::Rmin()) { | |
219 | AliDebug(1,Form("Track doesn't reach rho=%f",AliTOFGeometry::Rmin())); | |
220 | return kFALSE; | |
221 | } | |
222 | ||
223 | //GetXYZ(xyz0); | |
224 | //bz = GetBz(); | |
225 | //GetXYZAt(x,bz,xyz1); | |
226 | //AliExternalTrackParam::GetYAt(x,bz,y); | |
227 | //AliExternalTrackParam::GetZAt(x,bz,z); | |
228 | ||
9a4d9088 | 229 | if (!(PropagateTo(x,0.,0.))) { /* passing 0.,0. as arguments since now |
230 | this method queries TGeo for material budget | |
231 | */ | |
232 | return kFALSE; | |
233 | } | |
78c25bbc | 234 | |
9a4d9088 | 235 | if (GetY() > GetX()*kTalphac) { |
236 | if (!(Rotate(kAlphac))) return kFALSE; | |
237 | } else if (GetY() < -GetX()*kTalphac) { | |
238 | if (!(Rotate(-kAlphac))) return kFALSE; | |
239 | } | |
78c25bbc | 240 | |
241 | } | |
242 | ||
243 | //Bool_t check = PropagateTo(AliTOFGeometry::RinTOF()); | |
244 | Bool_t check = PropagateTo(AliTOFGeometry::RinTOF(),0.,0.); /* passing 0.,0. as arguments since now | |
245 | this method queries TGeo for material budget | |
246 | */ | |
247 | ||
248 | if (!check) return kFALSE; | |
249 | ||
9a4d9088 | 250 | if (GetY() > GetX()*kTalphac) { |
251 | if (!(Rotate(kAlphac))) return kFALSE; | |
252 | } else if (GetY() < -GetX()*kTalphac) { | |
253 | if (!(Rotate(-kAlphac))) return kFALSE; | |
254 | } | |
78c25bbc | 255 | |
256 | return kTRUE; | |
257 | ||
258 | } | |
259 | ||
260 | //_____________________________________________________________________________ | |
261 | Bool_t AliTOFtrack::PropagateToInnerTOFold() | |
262 | { | |
263 | // Propagates a track of particle with mass=pm to a reference plane | |
264 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
265 | ||
74ea065c | 266 | |
ba66add8 | 267 | Double_t ymax=AliTOFGeometry::RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha()); |
74ea065c | 268 | Bool_t skip = kFALSE; |
ba66add8 | 269 | Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip); |
6c94f330 | 270 | if (skip) { |
271 | return kFALSE; | |
74ea065c | 272 | } |
273 | if (y > ymax) { | |
9a4d9088 | 274 | if (!Rotate(AliTOFGeometry::GetAlpha())) return kFALSE; |
74ea065c | 275 | } else if (y <-ymax) { |
9a4d9088 | 276 | if (!Rotate(-AliTOFGeometry::GetAlpha())) return kFALSE; |
74ea065c | 277 | } |
278 | ||
2c770f53 | 279 | Double_t x = GetX(); |
b3e52baa | 280 | Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps |
74ea065c | 281 | for (Int_t istep=0;istep<nsteps;istep++){ |
282 | Float_t xp = x+istep*0.5; | |
5a388465 | 283 | // GetPropagationParameters(param); |
9a4d9088 | 284 | if (!(PropagateTo(xp,0.,0.))) { /* passing 0.,0. as arguments since now |
285 | this method queries TGeo for material budget | |
286 | */ | |
287 | return kFALSE; | |
288 | } | |
74ea065c | 289 | |
290 | } | |
291 | ||
9a4d9088 | 292 | if (!(PropagateTo(AliTOFGeometry::RinTOF()))) return kFALSE; |
293 | ||
6c94f330 | 294 | return kTRUE; |
74ea065c | 295 | |
296 | } | |
297 | ||
ac359ffe | 298 | //_________________________________________________________________________ |
299 | Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const { | |
300 | // | |
18f005ac | 301 | // Estimate the chi2 of the space point "c" with its cov. matrix elements |
ac359ffe | 302 | // |
18f005ac | 303 | |
ac359ffe | 304 | Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()}; |
305 | Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()}; | |
306 | Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()}; | |
307 | return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz); | |
308 | } | |
309 | //_________________________________________________________________________ | |
310 | Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) { | |
311 | // | |
18f005ac | 312 | // Propagates a track to the plane containing cluster 'c' |
ac359ffe | 313 | // |
314 | Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ(); | |
315 | Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()}; | |
316 | Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()}; | |
317 | Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()}; | |
318 | Double_t bz=GetBz(); | |
319 | if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE; | |
320 | if (IsStartedTimeIntegral()) { | |
321 | Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) + | |
322 | (GetY()-oldY)*(GetY()-oldY) + | |
323 | (GetZ()-oldZ)*(GetZ()-oldZ)); | |
324 | if (GetX()<oldX) d=-d; | |
325 | AddTimeStep(d); | |
78c25bbc | 326 | |
ac359ffe | 327 | } |
78c25bbc | 328 | |
9a4d9088 | 329 | if (GetY() > GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha())) { |
330 | if (!(Rotate(AliTOFGeometry::GetAlpha()))) return kFALSE; | |
331 | } else if (GetY() < -GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha())) { | |
332 | if (!(Rotate(-AliTOFGeometry::GetAlpha()))) return kFALSE; | |
333 | } | |
78c25bbc | 334 | |
ac359ffe | 335 | return kTRUE; |
336 | } | |
2c770f53 | 337 | //_________________________________________________________________________ |
4668c628 | 338 | Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const { |
2c770f53 | 339 | //----------------------------------------------------------------- |
340 | // This function calculates the Y-coordinate of a track at the plane x=xk. | |
341 | // Needed for matching with the TOF (I.Belikov) | |
342 | //----------------------------------------------------------------- | |
6c94f330 | 343 | Double_t y=0.; |
344 | skip=(!GetYAt(xk,GetBz(),y)); | |
345 | return y; | |
2c770f53 | 346 | } |
74ea065c | 347 | |
348 | //_____________________________________________________________________________ | |
349 | Int_t AliTOFtrack::Compare(const TObject *o) const { | |
350 | //----------------------------------------------------------------- | |
351 | // This function compares tracks according to the their curvature | |
352 | //----------------------------------------------------------------- | |
353 | AliTOFtrack *t=(AliTOFtrack*)o; | |
354 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); | |
355 | Double_t c =GetSigmaY2()*GetSigmaZ2(); | |
356 | if (c>co) return 1; | |
357 | else if (c<co) return -1; | |
358 | return 0; | |
359 | } | |
360 | ||
6c94f330 | 361 | |
74ea065c | 362 | //_____________________________________________________________________________ |
ba4161e8 | 363 | void AliTOFtrack::GetPropagationParameters(Double_t *param) { |
74ea065c | 364 | |
2c770f53 | 365 | //Get average medium density, x0 while propagating the track |
366 | ||
367 | //For TRD holes description | |
ba4161e8 | 368 | /* |
74ea065c | 369 | Double_t thetamin = (90.-31.1) * TMath::Pi()/180.; |
370 | Double_t thetamax = (90.+31.1) * TMath::Pi()/180.; | |
371 | ||
372 | Double_t zmin = -55.; | |
373 | Double_t zmax = 55.; | |
ba4161e8 | 374 | */ |
74ea065c | 375 | |
2c770f53 | 376 | // Detector inner/outer radii |
74ea065c | 377 | Double_t rTPC = 261.53; |
378 | Double_t rTPCTRD = 294.5; | |
379 | Double_t rTRD = 369.1; | |
380 | ||
2c770f53 | 381 | // Medium parameters |
74ea065c | 382 | Double_t x0TPC = 40.; |
383 | Double_t rhoTPC =0.06124; | |
384 | ||
385 | Double_t x0Air = 36.66; | |
386 | Double_t rhoAir =1.2931e-3; | |
387 | ||
388 | Double_t x0TRD = 171.7; | |
389 | Double_t rhoTRD =0.33; | |
390 | ||
ba4161e8 | 391 | // Int_t isec = GetSector(); |
6c94f330 | 392 | Double_t r[3]; GetXYZ(r); |
ba4161e8 | 393 | // Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]); |
74ea065c | 394 | |
ba4161e8 | 395 | /* |
74ea065c | 396 | if(holes){ |
397 | if (isec == 0 || isec == 1 || isec == 2 ) { | |
398 | if( thetatr>=thetamin && thetatr<=thetamax){ | |
399 | x0TRD= x0Air; | |
400 | rhoTRD = rhoAir; | |
401 | } | |
402 | } | |
403 | if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) { | |
6c94f330 | 404 | if( r[2]>=zmin && r[2]<=zmax){ |
74ea065c | 405 | x0TRD= x0Air; |
406 | rhoTRD = rhoAir; | |
407 | } | |
408 | } | |
409 | } | |
ba4161e8 | 410 | */ |
2c770f53 | 411 | if(GetX() <= rTPC) |
74ea065c | 412 | {param[0]=x0TPC;param[1]=rhoTPC;} |
2c770f53 | 413 | else if(GetX() > rTPC && GetX() < rTPCTRD) |
74ea065c | 414 | {param[0]=x0Air;param[1]=rhoAir;} |
2c770f53 | 415 | else if(GetX() >= rTPCTRD && GetX() < rTRD) |
74ea065c | 416 | {param[0]=x0TRD;param[1]=rhoTRD;} |
2c770f53 | 417 | else if(GetX() >= rTRD ) |
74ea065c | 418 | {param[0]=x0Air;param[1]=rhoAir;} |
74ea065c | 419 | } |