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006b5f7f | 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 | ||
ae00569a | 16 | /* $Id$ */ |
17 | ||
66e811e2 | 18 | /////////////////////////////////////////////////////////////////////////// |
006b5f7f | 19 | // Implementation of the ITS track class |
20 | // | |
21 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
a9a2d814 | 22 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch |
66e811e2 | 23 | /////////////////////////////////////////////////////////////////////////// |
006b5f7f | 24 | #include <TMath.h> |
006b5f7f | 25 | |
26 | #include "AliCluster.h" | |
6c94f330 | 27 | #include "AliTracker.h" |
83d73500 | 28 | #include "AliESDtrack.h" |
8a84886c | 29 | #include "AliITSReconstructor.h" |
006b5f7f | 30 | #include "AliITStrackV2.h" |
31 | ||
8602c008 | 32 | const Int_t AliITStrackV2::fgkWARN = 5; |
33 | ||
1aedd96e | 34 | ClassImp(AliITStrackV2) |
8676d691 | 35 | |
e43c066c | 36 | |
22b13da0 | 37 | //____________________________________________________________________________ |
6c94f330 | 38 | AliITStrackV2::AliITStrackV2() : AliKalmanTrack(), |
22b13da0 | 39 | fdEdx(0), |
83d73500 | 40 | fESDtrack(0) |
e43c066c | 41 | { |
ae00569a | 42 | for(Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) {fIndex[i]=-1; fModule[i]=-1;} |
43 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; | |
e43c066c | 44 | } |
45 | ||
83d73500 | 46 | |
83d73500 | 47 | //____________________________________________________________________________ |
67c3dcbe | 48 | AliITStrackV2::AliITStrackV2(AliESDtrack& t,Bool_t c) throw (const Char_t *) : |
6c94f330 | 49 | AliKalmanTrack(), |
50 | fdEdx(t.GetITSsignal()), | |
51 | fESDtrack(&t) | |
52 | { | |
83d73500 | 53 | //------------------------------------------------------------------ |
67c3dcbe | 54 | // Conversion ESD track -> ITS track. |
55 | // If c==kTRUE, create the ITS track out of the constrained params. | |
83d73500 | 56 | //------------------------------------------------------------------ |
6c94f330 | 57 | const AliExternalTrackParam *par=&t; |
58 | if (c) { | |
6c4ef2ed | 59 | par=t.GetConstrainedParam(); |
6c94f330 | 60 | if (!par) throw "AliITStrackV2: conversion failed !\n"; |
61 | } | |
62 | Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance()); | |
63 | ||
64 | //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; | |
65 | ||
83d73500 | 66 | SetLabel(t.GetLabel()); |
67 | SetMass(t.GetMass()); | |
6c94f330 | 68 | SetNumberOfClusters(t.GetITSclusters(fIndex)); |
006b5f7f | 69 | |
83d73500 | 70 | if (t.GetStatus()&AliESDtrack::kTIME) { |
71 | StartTimeIntegral(); | |
72 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
73 | SetIntegratedLength(t.GetIntegratedLength()); | |
74 | } | |
e43c066c | 75 | |
68b8060b | 76 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; |
006b5f7f | 77 | } |
78 | ||
7ac23097 | 79 | //____________________________________________________________________________ |
80 | void AliITStrackV2::ResetClusters() { | |
81 | //------------------------------------------------------------------ | |
82 | // Reset the array of attached clusters. | |
83 | //------------------------------------------------------------------ | |
84 | for (Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) fIndex[i]=-1; | |
85 | SetChi2(0.); | |
86 | SetNumberOfClusters(0); | |
87 | } | |
88 | ||
15dd636f | 89 | void AliITStrackV2::UpdateESDtrack(ULong_t flags) const { |
83d73500 | 90 | fESDtrack->UpdateTrackParams(this,flags); |
ae00569a | 91 | // copy the module indices |
92 | for(Int_t i=0;i<12;i++) { | |
93 | // printf(" %d\n",GetModuleIndex(i)); | |
94 | fESDtrack->SetITSModuleIndex(i,GetModuleIndex(i)); | |
95 | } | |
83d73500 | 96 | } |
97 | ||
006b5f7f | 98 | //____________________________________________________________________________ |
6c94f330 | 99 | AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) : |
100 | AliKalmanTrack(t), | |
101 | fdEdx(t.fdEdx), | |
102 | fESDtrack(t.fESDtrack) | |
103 | { | |
006b5f7f | 104 | //------------------------------------------------------------------ |
105 | //Copy constructor | |
106 | //------------------------------------------------------------------ | |
ef7253ac | 107 | Int_t i; |
ef7253ac | 108 | for (i=0; i<4; i++) fdEdxSample[i]=t.fdEdxSample[i]; |
ae00569a | 109 | for (i=0; i<2*AliITSgeomTGeo::GetNLayers(); i++) { |
110 | fIndex[i]=t.fIndex[i]; | |
111 | fModule[i]=t.fModule[i]; | |
112 | } | |
006b5f7f | 113 | } |
a9a2d814 | 114 | |
006b5f7f | 115 | //_____________________________________________________________________________ |
116 | Int_t AliITStrackV2::Compare(const TObject *o) const { | |
117 | //----------------------------------------------------------------- | |
118 | // This function compares tracks according to the their curvature | |
119 | //----------------------------------------------------------------- | |
7f6ddf58 | 120 | AliITStrackV2 *t=(AliITStrackV2*)o; |
6c23ffed | 121 | //Double_t co=OneOverPt(); |
122 | //Double_t c =OneOverPt(); | |
15dd636f | 123 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); |
124 | Double_t c =GetSigmaY2()*GetSigmaZ2(); | |
006b5f7f | 125 | if (c>co) return 1; |
126 | else if (c<co) return -1; | |
127 | return 0; | |
128 | } | |
129 | ||
006b5f7f | 130 | //____________________________________________________________________________ |
6c94f330 | 131 | Bool_t |
132 | AliITStrackV2::PropagateToVertex(const AliESDVertex *v,Double_t d,Double_t x0) | |
133 | { | |
006b5f7f | 134 | //------------------------------------------------------------------ |
135 | //This function propagates a track to the minimal distance from the origin | |
6c94f330 | 136 | //------------------------------------------------------------------ |
137 | Double_t bz=GetBz(); | |
e50912db | 138 | if (PropagateToDCA(v,bz,kVeryBig)) { |
139 | Double_t xOverX0,xTimesRho; | |
140 | xOverX0 = d; xTimesRho = d*x0; | |
141 | if (CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kTRUE; | |
142 | } | |
6c94f330 | 143 | return kFALSE; |
006b5f7f | 144 | } |
145 | ||
146 | //____________________________________________________________________________ | |
6c94f330 | 147 | Bool_t AliITStrackV2:: |
e50912db | 148 | GetGlobalXYZat(Double_t xloc, Double_t &x, Double_t &y, Double_t &z) const { |
006b5f7f | 149 | //------------------------------------------------------------------ |
150 | //This function returns a track position in the global system | |
151 | //------------------------------------------------------------------ | |
6c94f330 | 152 | Double_t r[3]; |
e50912db | 153 | Bool_t rc=GetXYZAt(xloc, AliTracker::GetBz(), r); |
6c94f330 | 154 | x=r[0]; y=r[1]; z=r[2]; |
155 | return rc; | |
006b5f7f | 156 | } |
157 | ||
158 | //_____________________________________________________________________________ | |
6c94f330 | 159 | Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const { |
006b5f7f | 160 | //----------------------------------------------------------------- |
161 | // This function calculates a predicted chi2 increment. | |
162 | //----------------------------------------------------------------- | |
6c94f330 | 163 | Double_t p[2]={c->GetY(), c->GetZ()}; |
164 | Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; | |
165 | return AliExternalTrackParam::GetPredictedChi2(p,cov); | |
a9a2d814 | 166 | } |
167 | ||
168 | //____________________________________________________________________________ | |
6c94f330 | 169 | Bool_t AliITStrackV2::PropagateTo(Double_t xk, Double_t d, Double_t x0) { |
006b5f7f | 170 | //------------------------------------------------------------------ |
171 | //This function propagates a track | |
172 | //------------------------------------------------------------------ | |
afd25725 | 173 | |
6c94f330 | 174 | Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ(); |
006b5f7f | 175 | |
6c94f330 | 176 | Double_t bz=GetBz(); |
177 | if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE; | |
e50912db | 178 | Double_t xOverX0,xTimesRho; |
179 | xOverX0 = d; xTimesRho = d*x0; | |
180 | if (!CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kFALSE; | |
006b5f7f | 181 | |
dd44614b | 182 | Double_t x=GetX(), y=GetY(), z=GetZ(); |
6c94f330 | 183 | if (IsStartedTimeIntegral() && x>oldX) { |
184 | Double_t l2 = (x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ); | |
f29dbb4b | 185 | AddTimeStep(TMath::Sqrt(l2)); |
186 | } | |
f29dbb4b | 187 | |
6c94f330 | 188 | return kTRUE; |
006b5f7f | 189 | } |
190 | ||
afd25725 | 191 | //____________________________________________________________________________ |
e50912db | 192 | Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho) { |
afd25725 | 193 | //------------------------------------------------------------------- |
194 | // Propagates the track to a reference plane x=xToGo in n steps. | |
195 | // These n steps are only used to take into account the curvature. | |
196 | // The material is calculated with TGeo. (L.Gaudichet) | |
197 | //------------------------------------------------------------------- | |
198 | ||
199 | Double_t startx = GetX(), starty = GetY(), startz = GetZ(); | |
200 | Double_t sign = (startx<xToGo) ? -1.:1.; | |
201 | Double_t step = (xToGo-startx)/TMath::Abs(nstep); | |
202 | ||
203 | Double_t start[3], end[3], mparam[7], bz = GetBz(); | |
204 | Double_t x = startx; | |
205 | ||
206 | for (Int_t i=0; i<nstep; i++) { | |
207 | ||
208 | GetXYZ(start); //starting global position | |
209 | x += step; | |
210 | if (!GetXYZAt(x, bz, end)) return kFALSE; | |
211 | if (!AliExternalTrackParam::PropagateTo(x, bz)) return kFALSE; | |
212 | AliTracker::MeanMaterialBudget(start, end, mparam); | |
afd25725 | 213 | if (mparam[1]<900000) { |
e50912db | 214 | xTimesRho = sign*mparam[4]*mparam[0]; |
215 | xOverX0 = mparam[1]; | |
afd25725 | 216 | if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0, |
e50912db | 217 | xTimesRho,GetMass())) return kFALSE; |
afd25725 | 218 | } |
219 | } | |
220 | ||
221 | if (IsStartedTimeIntegral() && GetX()>startx) { | |
222 | Double_t l2 = ( (GetX()-startx)*(GetX()-startx) + | |
223 | (GetY()-starty)*(GetY()-starty) + | |
224 | (GetZ()-startz)*(GetZ()-startz) ); | |
225 | AddTimeStep(TMath::Sqrt(l2)); | |
226 | } | |
227 | ||
228 | return kTRUE; | |
229 | } | |
230 | ||
006b5f7f | 231 | //____________________________________________________________________________ |
6c94f330 | 232 | Bool_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, Int_t index) |
233 | { | |
006b5f7f | 234 | //------------------------------------------------------------------ |
235 | //This function updates track parameters | |
236 | //------------------------------------------------------------------ | |
6c94f330 | 237 | Double_t p[2]={c->GetY(), c->GetZ()}; |
238 | Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; | |
006b5f7f | 239 | |
6c94f330 | 240 | if (!AliExternalTrackParam::Update(p,cov)) return kFALSE; |
006b5f7f | 241 | |
28d5b13d | 242 | Int_t n=GetNumberOfClusters(); |
006b5f7f | 243 | if (!Invariant()) { |
28d5b13d | 244 | if (n>fgkWARN) AliWarning("Wrong invariant !"); |
6c94f330 | 245 | return kFALSE; |
006b5f7f | 246 | } |
247 | ||
6c94f330 | 248 | if (chi2<0) return kTRUE; |
67c3dcbe | 249 | |
150f264c | 250 | AliTracker::FillResiduals(this,p,cov,c->GetVolumeId()); |
251 | ||
006b5f7f | 252 | fIndex[n]=index; |
253 | SetNumberOfClusters(n+1); | |
254 | SetChi2(GetChi2()+chi2); | |
255 | ||
6c94f330 | 256 | return kTRUE; |
006b5f7f | 257 | } |
258 | ||
6c94f330 | 259 | Bool_t AliITStrackV2::Invariant() const { |
006b5f7f | 260 | //------------------------------------------------------------------ |
261 | // This function is for debugging purpose only | |
262 | //------------------------------------------------------------------ | |
7f6ddf58 | 263 | Int_t n=GetNumberOfClusters(); |
6c94f330 | 264 | |
8a84886c | 265 | // take into account the misalignment error |
266 | Float_t maxMisalErrY2=0,maxMisalErrZ2=0; | |
267 | for (Int_t lay=0; lay<AliITSgeomTGeo::kNLayers; lay++) { | |
268 | maxMisalErrY2 = TMath::Max(maxMisalErrY2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(lay)); | |
269 | maxMisalErrZ2 = TMath::Max(maxMisalErrZ2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(lay)); | |
270 | } | |
271 | maxMisalErrY2 *= maxMisalErrY2; | |
272 | maxMisalErrZ2 *= maxMisalErrZ2; | |
273 | // this is because when we reset before refitting, we multiply the | |
274 | // matrix by 10 | |
275 | maxMisalErrY2 *= 10.; | |
276 | maxMisalErrZ2 *= 10.; | |
277 | ||
6c94f330 | 278 | Double_t sP2=GetParameter()[2]; |
279 | if (TMath::Abs(sP2) >= kAlmost1){ | |
8602c008 | 280 | if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2); |
6c94f330 | 281 | return kFALSE; |
a9a2d814 | 282 | } |
6c94f330 | 283 | Double_t sC00=GetCovariance()[0]; |
8a84886c | 284 | if (sC00<=0 || sC00>(9.+maxMisalErrY2)) { |
8602c008 | 285 | if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00); |
6c94f330 | 286 | return kFALSE; |
a9a2d814 | 287 | } |
6c94f330 | 288 | Double_t sC11=GetCovariance()[2]; |
8a84886c | 289 | if (sC11<=0 || sC11>(9.+maxMisalErrZ2)) { |
8602c008 | 290 | if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11); |
6c94f330 | 291 | return kFALSE; |
a9a2d814 | 292 | } |
6c94f330 | 293 | Double_t sC22=GetCovariance()[5]; |
294 | if (sC22<=0 || sC22>1.) { | |
8602c008 | 295 | if (n>fgkWARN) Warning("Invariant","fC22=%f\n",sC22); |
6c94f330 | 296 | return kFALSE; |
a9a2d814 | 297 | } |
6c94f330 | 298 | Double_t sC33=GetCovariance()[9]; |
299 | if (sC33<=0 || sC33>1.) { | |
8602c008 | 300 | if (n>fgkWARN) Warning("Invariant","fC33=%f\n",sC33); |
6c94f330 | 301 | return kFALSE; |
a9a2d814 | 302 | } |
6c94f330 | 303 | Double_t sC44=GetCovariance()[14]; |
304 | if (sC44<=0 /*|| sC44>6e-5*/) { | |
8602c008 | 305 | if (n>fgkWARN) Warning("Invariant","fC44=%f\n",sC44); |
6c94f330 | 306 | return kFALSE; |
14825d5a | 307 | } |
6c94f330 | 308 | |
309 | return kTRUE; | |
006b5f7f | 310 | } |
311 | ||
312 | //____________________________________________________________________________ | |
6c94f330 | 313 | Bool_t AliITStrackV2::Propagate(Double_t alp,Double_t xk) { |
006b5f7f | 314 | //------------------------------------------------------------------ |
315 | //This function propagates a track | |
316 | //------------------------------------------------------------------ | |
6c94f330 | 317 | Double_t bz=GetBz(); |
318 | if (!AliExternalTrackParam::Propagate(alp,xk,bz)) return kFALSE; | |
006b5f7f | 319 | |
006b5f7f | 320 | if (!Invariant()) { |
8a84886c | 321 | Int_t n=GetNumberOfClusters(); |
322 | if (n>fgkWARN) AliWarning("Wrong invariant !"); | |
323 | return kFALSE; | |
791f9a2a | 324 | } |
325 | ||
6c94f330 | 326 | return kTRUE; |
a9a2d814 | 327 | } |
006b5f7f | 328 | |
afd25725 | 329 | Bool_t AliITStrackV2::MeanBudgetToPrimVertex(Double_t xyz[3], Double_t step, Double_t &d) const { |
330 | ||
331 | //------------------------------------------------------------------- | |
332 | // Get the mean material budget between the actual point and the | |
333 | // primary vertex. (L.Gaudichet) | |
334 | //------------------------------------------------------------------- | |
335 | ||
336 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); | |
337 | Double_t vertexX = xyz[0]*cs + xyz[1]*sn; | |
338 | ||
339 | Int_t nstep = Int_t((GetX()-vertexX)/step); | |
340 | if (nstep<1) nstep = 1; | |
341 | step = (GetX()-vertexX)/nstep; | |
342 | ||
c7719399 | 343 | // Double_t mparam[7], densMean=0, radLength=0, length=0; |
344 | Double_t mparam[7]; | |
afd25725 | 345 | Double_t p1[3], p2[3], x = GetX(), bz = GetBz(); |
346 | GetXYZ(p1); | |
347 | ||
348 | d=0.; | |
349 | ||
350 | for (Int_t i=0; i<nstep; i++) { | |
351 | x += step; | |
352 | if (!GetXYZAt(x, bz, p2)) return kFALSE; | |
353 | AliTracker::MeanMaterialBudget(p1, p2, mparam); | |
354 | if (mparam[1]>900000) return kFALSE; | |
355 | d += mparam[1]; | |
356 | ||
357 | p1[0] = p2[0]; | |
358 | p1[1] = p2[1]; | |
359 | p1[2] = p2[2]; | |
360 | } | |
361 | ||
362 | return kTRUE; | |
363 | } | |
364 | ||
6c94f330 | 365 | Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) { |
babd135a | 366 | //------------------------------------------------------------------ |
6c94f330 | 367 | //This function improves angular track parameters |
babd135a | 368 | //------------------------------------------------------------------ |
6c94f330 | 369 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); |
370 | //Double_t xv = xyz[0]*cs + xyz[1]*sn; // vertex | |
371 | Double_t yv =-xyz[0]*sn + xyz[1]*cs; // in the | |
372 | Double_t zv = xyz[2]; // local frame | |
babd135a | 373 | |
6c94f330 | 374 | Double_t dy = Par(0) - yv, dz = Par(1) - zv; |
375 | Double_t r2=GetX()*GetX() + dy*dy; | |
6c23ffed | 376 | Double_t p2=(1.+ GetTgl()*GetTgl())/(GetSigned1Pt()*GetSigned1Pt()); |
a9a2d814 | 377 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
378 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); | |
8676d691 | 379 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; |
380 | //Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33; | |
6c94f330 | 381 | |
382 | Double_t cnv=GetBz()*kB2C; | |
a9a2d814 | 383 | { |
6c94f330 | 384 | Double_t dummy = 4/r2 - GetC()*GetC(); |
385 | if (dummy < 0) return kFALSE; | |
386 | Double_t parp = 0.5*(GetC()*GetX() + dy*TMath::Sqrt(dummy)); | |
387 | Double_t sigma2p = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl()); | |
388 | sigma2p += Cov(0)/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2); | |
389 | sigma2p += ers[1]*ers[1]/r2; | |
390 | sigma2p += 0.25*Cov(14)*cnv*cnv*GetX()*GetX(); | |
00709873 | 391 | Double_t eps2p=sigma2p/(Cov(5) + sigma2p); |
6c94f330 | 392 | Par(0) += Cov(3)/(Cov(5) + sigma2p)*(parp - GetSnp()); |
393 | Par(2) = eps2p*GetSnp() + (1 - eps2p)*parp; | |
394 | Cov(5) *= eps2p; | |
395 | Cov(3) *= eps2p; | |
a9a2d814 | 396 | } |
397 | { | |
6c94f330 | 398 | Double_t parl=0.5*GetC()*dz/TMath::ASin(0.5*GetC()*TMath::Sqrt(r2)); |
399 | Double_t sigma2l=theta2; | |
400 | sigma2l += Cov(2)/r2 + Cov(0)*dy*dy*dz*dz/(r2*r2*r2); | |
401 | sigma2l += ers[2]*ers[2]/r2; | |
402 | Double_t eps2l = sigma2l/(Cov(9) + sigma2l); | |
403 | Par(1) += Cov(7 )/(Cov(9) + sigma2l)*(parl - Par(3)); | |
404 | Par(4) += Cov(13)/(Cov(9) + sigma2l)*(parl - Par(3)); | |
405 | Par(3) = eps2l*Par(3) + (1-eps2l)*parl; | |
406 | Cov(9) *= eps2l; | |
00709873 | 407 | Cov(13)*= eps2l; |
6c94f330 | 408 | Cov(7) *= eps2l; |
a9a2d814 | 409 | } |
6c94f330 | 410 | if (!Invariant()) return kFALSE; |
14825d5a | 411 | |
6c94f330 | 412 | return kTRUE; |
14825d5a | 413 | } |
23efe5f1 | 414 | |
415 | void AliITStrackV2::CookdEdx(Double_t low, Double_t up) { | |
416 | //----------------------------------------------------------------- | |
a9a2d814 | 417 | // This function calculates dE/dX within the "low" and "up" cuts. |
418 | // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
23efe5f1 | 419 | //----------------------------------------------------------------- |
23efe5f1 | 420 | // The clusters order is: SSD-2, SSD-1, SDD-2, SDD-1, SPD-2, SPD-1 |
c0dd5278 | 421 | |
422 | Int_t i; | |
423 | Int_t nc=0; | |
424 | for (i=0; i<GetNumberOfClusters(); i++) { | |
425 | Int_t idx=GetClusterIndex(i); | |
426 | idx=(idx&0xf0000000)>>28; | |
427 | if (idx>1) nc++; // Take only SSD and SDD | |
428 | } | |
23efe5f1 | 429 | |
a9a2d814 | 430 | Int_t swap;//stupid sorting |
23efe5f1 | 431 | do { |
432 | swap=0; | |
433 | for (i=0; i<nc-1; i++) { | |
434 | if (fdEdxSample[i]<=fdEdxSample[i+1]) continue; | |
435 | Float_t tmp=fdEdxSample[i]; | |
436 | fdEdxSample[i]=fdEdxSample[i+1]; fdEdxSample[i+1]=tmp; | |
437 | swap++; | |
438 | } | |
439 | } while (swap); | |
440 | ||
a9a2d814 | 441 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); //b.b. to take two lowest dEdX |
442 | // values from four ones choose | |
443 | // nu=2 | |
23efe5f1 | 444 | Float_t dedx=0; |
a9a2d814 | 445 | for (i=nl; i<nu; i++) dedx += fdEdxSample[i]; |
c0dd5278 | 446 | if (nu-nl>0) dedx /= (nu-nl); |
23efe5f1 | 447 | |
23efe5f1 | 448 | SetdEdx(dedx); |
449 | } | |
c7bafca9 | 450 | |
6c94f330 | 451 | Double_t AliITStrackV2::GetBz() const { |
452 | // | |
453 | // returns Bz component of the magnetic field (kG) | |
454 | // | |
455 | if (AliTracker::UniformField()) return AliTracker::GetBz(); | |
456 | Double_t r[3]; GetXYZ(r); | |
457 | return AliTracker::GetBz(r); | |
5773defd | 458 | } |
6c94f330 | 459 | |
8602c008 | 460 | //____________________________________________________________________________ |
461 | Bool_t AliITStrackV2:: | |
e50912db | 462 | GetPhiZat(Double_t r, Double_t &phi, Double_t &z) const { |
463 | //------------------------------------------------------------------ | |
464 | // This function returns the global cylindrical (phi,z) of the track | |
465 | // position estimated at the radius r. | |
466 | // The track curvature is neglected. | |
467 | //------------------------------------------------------------------ | |
468 | Double_t d=GetD(0.,0.); | |
469 | if (TMath::Abs(d) > r) return kFALSE; | |
470 | ||
471 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); | |
472 | if (TMath::Abs(d) > rcurr) return kFALSE; | |
473 | Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp()); | |
474 | ||
475 | phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
c7de5c65 | 476 | z=GetZ()+GetTgl()*(TMath::Sqrt((r-d)*(r+d))-TMath::Sqrt((rcurr-d)*(rcurr+d))); |
e50912db | 477 | return kTRUE; |
478 | } | |
479 | //____________________________________________________________________________ | |
480 | Bool_t AliITStrackV2:: | |
481 | GetLocalXat(Double_t r,Double_t &xloc) const { | |
8602c008 | 482 | //------------------------------------------------------------------ |
e50912db | 483 | // This function returns the local x of the track |
484 | // position estimated at the radius r. | |
8602c008 | 485 | // The track curvature is neglected. |
486 | //------------------------------------------------------------------ | |
487 | Double_t d=GetD(0.,0.); | |
e50912db | 488 | if (TMath::Abs(d) > r) return kFALSE; |
8602c008 | 489 | |
e50912db | 490 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); |
491 | Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp()); | |
492 | Double_t phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
8602c008 | 493 | |
e50912db | 494 | xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha()) |
495 | +TMath::Sin(phi)*TMath::Sin(GetAlpha())); | |
8602c008 | 496 | |
497 | return kTRUE; | |
498 | } |