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