]>
Commit | Line | Data |
---|---|---|
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" | |
83d73500 | 27 | #include "AliESDtrack.h" |
58e536c5 | 28 | #include "AliESDVertex.h" |
8a84886c | 29 | #include "AliITSReconstructor.h" |
006b5f7f | 30 | #include "AliITStrackV2.h" |
f7a1cc68 | 31 | #include "AliTracker.h" |
006b5f7f | 32 | |
8602c008 | 33 | const Int_t AliITStrackV2::fgkWARN = 5; |
34 | ||
1aedd96e | 35 | ClassImp(AliITStrackV2) |
8676d691 | 36 | |
e43c066c | 37 | |
22b13da0 | 38 | //____________________________________________________________________________ |
6c94f330 | 39 | AliITStrackV2::AliITStrackV2() : AliKalmanTrack(), |
22b13da0 | 40 | fdEdx(0), |
83d73500 | 41 | fESDtrack(0) |
e43c066c | 42 | { |
ae00569a | 43 | for(Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) {fIndex[i]=-1; fModule[i]=-1;} |
44 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; | |
e43c066c | 45 | } |
46 | ||
83d73500 | 47 | |
83d73500 | 48 | //____________________________________________________________________________ |
67c3dcbe | 49 | AliITStrackV2::AliITStrackV2(AliESDtrack& t,Bool_t c) throw (const Char_t *) : |
6c94f330 | 50 | AliKalmanTrack(), |
51 | fdEdx(t.GetITSsignal()), | |
52 | fESDtrack(&t) | |
53 | { | |
83d73500 | 54 | //------------------------------------------------------------------ |
67c3dcbe | 55 | // Conversion ESD track -> ITS track. |
56 | // If c==kTRUE, create the ITS track out of the constrained params. | |
83d73500 | 57 | //------------------------------------------------------------------ |
6c94f330 | 58 | const AliExternalTrackParam *par=&t; |
59 | if (c) { | |
6c4ef2ed | 60 | par=t.GetConstrainedParam(); |
6c94f330 | 61 | if (!par) throw "AliITStrackV2: conversion failed !\n"; |
62 | } | |
63 | Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance()); | |
64 | ||
65 | //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; | |
66 | ||
83d73500 | 67 | SetLabel(t.GetLabel()); |
68 | SetMass(t.GetMass()); | |
6c94f330 | 69 | SetNumberOfClusters(t.GetITSclusters(fIndex)); |
006b5f7f | 70 | |
83d73500 | 71 | if (t.GetStatus()&AliESDtrack::kTIME) { |
72 | StartTimeIntegral(); | |
73 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
74 | SetIntegratedLength(t.GetIntegratedLength()); | |
75 | } | |
e43c066c | 76 | |
68b8060b | 77 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; |
006b5f7f | 78 | } |
79 | ||
7ac23097 | 80 | //____________________________________________________________________________ |
81 | void AliITStrackV2::ResetClusters() { | |
82 | //------------------------------------------------------------------ | |
83 | // Reset the array of attached clusters. | |
84 | //------------------------------------------------------------------ | |
85 | for (Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) fIndex[i]=-1; | |
86 | SetChi2(0.); | |
87 | SetNumberOfClusters(0); | |
88 | } | |
89 | ||
15dd636f | 90 | void AliITStrackV2::UpdateESDtrack(ULong_t flags) const { |
83d73500 | 91 | fESDtrack->UpdateTrackParams(this,flags); |
ae00569a | 92 | // copy the module indices |
93 | for(Int_t i=0;i<12;i++) { | |
94 | // printf(" %d\n",GetModuleIndex(i)); | |
95 | fESDtrack->SetITSModuleIndex(i,GetModuleIndex(i)); | |
96 | } | |
83d73500 | 97 | } |
98 | ||
006b5f7f | 99 | //____________________________________________________________________________ |
6c94f330 | 100 | AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) : |
101 | AliKalmanTrack(t), | |
102 | fdEdx(t.fdEdx), | |
103 | fESDtrack(t.fESDtrack) | |
104 | { | |
006b5f7f | 105 | //------------------------------------------------------------------ |
106 | //Copy constructor | |
107 | //------------------------------------------------------------------ | |
ef7253ac | 108 | Int_t i; |
ef7253ac | 109 | for (i=0; i<4; i++) fdEdxSample[i]=t.fdEdxSample[i]; |
ae00569a | 110 | for (i=0; i<2*AliITSgeomTGeo::GetNLayers(); i++) { |
111 | fIndex[i]=t.fIndex[i]; | |
112 | fModule[i]=t.fModule[i]; | |
113 | } | |
006b5f7f | 114 | } |
a9a2d814 | 115 | |
006b5f7f | 116 | //_____________________________________________________________________________ |
117 | Int_t AliITStrackV2::Compare(const TObject *o) const { | |
118 | //----------------------------------------------------------------- | |
119 | // This function compares tracks according to the their curvature | |
120 | //----------------------------------------------------------------- | |
7f6ddf58 | 121 | AliITStrackV2 *t=(AliITStrackV2*)o; |
6c23ffed | 122 | //Double_t co=OneOverPt(); |
123 | //Double_t c =OneOverPt(); | |
15dd636f | 124 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); |
125 | Double_t c =GetSigmaY2()*GetSigmaZ2(); | |
006b5f7f | 126 | if (c>co) return 1; |
127 | else if (c<co) return -1; | |
128 | return 0; | |
129 | } | |
130 | ||
006b5f7f | 131 | //____________________________________________________________________________ |
6c94f330 | 132 | Bool_t |
133 | AliITStrackV2::PropagateToVertex(const AliESDVertex *v,Double_t d,Double_t x0) | |
134 | { | |
006b5f7f | 135 | //------------------------------------------------------------------ |
136 | //This function propagates a track to the minimal distance from the origin | |
6c94f330 | 137 | //------------------------------------------------------------------ |
138 | Double_t bz=GetBz(); | |
e50912db | 139 | if (PropagateToDCA(v,bz,kVeryBig)) { |
140 | Double_t xOverX0,xTimesRho; | |
141 | xOverX0 = d; xTimesRho = d*x0; | |
142 | if (CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kTRUE; | |
143 | } | |
6c94f330 | 144 | return kFALSE; |
006b5f7f | 145 | } |
146 | ||
147 | //____________________________________________________________________________ | |
6c94f330 | 148 | Bool_t AliITStrackV2:: |
e50912db | 149 | GetGlobalXYZat(Double_t xloc, Double_t &x, Double_t &y, Double_t &z) const { |
006b5f7f | 150 | //------------------------------------------------------------------ |
151 | //This function returns a track position in the global system | |
152 | //------------------------------------------------------------------ | |
6c94f330 | 153 | Double_t r[3]; |
f7a1cc68 | 154 | Bool_t rc=GetXYZAt(xloc, GetBz(), r); |
6c94f330 | 155 | x=r[0]; y=r[1]; z=r[2]; |
156 | return rc; | |
006b5f7f | 157 | } |
158 | ||
159 | //_____________________________________________________________________________ | |
6c94f330 | 160 | Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const { |
006b5f7f | 161 | //----------------------------------------------------------------- |
162 | // This function calculates a predicted chi2 increment. | |
163 | //----------------------------------------------------------------- | |
6c94f330 | 164 | Double_t p[2]={c->GetY(), c->GetZ()}; |
165 | Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; | |
166 | return AliExternalTrackParam::GetPredictedChi2(p,cov); | |
a9a2d814 | 167 | } |
168 | ||
169 | //____________________________________________________________________________ | |
6c94f330 | 170 | Bool_t AliITStrackV2::PropagateTo(Double_t xk, Double_t d, Double_t x0) { |
006b5f7f | 171 | //------------------------------------------------------------------ |
172 | //This function propagates a track | |
173 | //------------------------------------------------------------------ | |
afd25725 | 174 | |
6c94f330 | 175 | Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ(); |
006b5f7f | 176 | |
6c94f330 | 177 | Double_t bz=GetBz(); |
178 | if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE; | |
e50912db | 179 | Double_t xOverX0,xTimesRho; |
180 | xOverX0 = d; xTimesRho = d*x0; | |
181 | if (!CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kFALSE; | |
006b5f7f | 182 | |
dd44614b | 183 | Double_t x=GetX(), y=GetY(), z=GetZ(); |
6c94f330 | 184 | if (IsStartedTimeIntegral() && x>oldX) { |
185 | Double_t l2 = (x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ); | |
f29dbb4b | 186 | AddTimeStep(TMath::Sqrt(l2)); |
187 | } | |
f29dbb4b | 188 | |
6c94f330 | 189 | return kTRUE; |
006b5f7f | 190 | } |
191 | ||
afd25725 | 192 | //____________________________________________________________________________ |
db355ee7 | 193 | Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho, Bool_t addTime) { |
afd25725 | 194 | //------------------------------------------------------------------- |
195 | // Propagates the track to a reference plane x=xToGo in n steps. | |
196 | // These n steps are only used to take into account the curvature. | |
197 | // The material is calculated with TGeo. (L.Gaudichet) | |
198 | //------------------------------------------------------------------- | |
199 | ||
200 | Double_t startx = GetX(), starty = GetY(), startz = GetZ(); | |
201 | Double_t sign = (startx<xToGo) ? -1.:1.; | |
202 | Double_t step = (xToGo-startx)/TMath::Abs(nstep); | |
203 | ||
204 | Double_t start[3], end[3], mparam[7], bz = GetBz(); | |
205 | Double_t x = startx; | |
206 | ||
207 | for (Int_t i=0; i<nstep; i++) { | |
208 | ||
209 | GetXYZ(start); //starting global position | |
210 | x += step; | |
211 | if (!GetXYZAt(x, bz, end)) return kFALSE; | |
212 | if (!AliExternalTrackParam::PropagateTo(x, bz)) return kFALSE; | |
213 | AliTracker::MeanMaterialBudget(start, end, mparam); | |
afd25725 | 214 | if (mparam[1]<900000) { |
e50912db | 215 | xTimesRho = sign*mparam[4]*mparam[0]; |
216 | xOverX0 = mparam[1]; | |
afd25725 | 217 | if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0, |
e50912db | 218 | xTimesRho,GetMass())) return kFALSE; |
afd25725 | 219 | } |
220 | } | |
221 | ||
db355ee7 | 222 | if (addTime && IsStartedTimeIntegral() && GetX()>startx) { |
afd25725 | 223 | Double_t l2 = ( (GetX()-startx)*(GetX()-startx) + |
224 | (GetY()-starty)*(GetY()-starty) + | |
225 | (GetZ()-startz)*(GetZ()-startz) ); | |
226 | AddTimeStep(TMath::Sqrt(l2)); | |
227 | } | |
228 | ||
229 | return kTRUE; | |
230 | } | |
231 | ||
006b5f7f | 232 | //____________________________________________________________________________ |
6c94f330 | 233 | Bool_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, Int_t index) |
234 | { | |
006b5f7f | 235 | //------------------------------------------------------------------ |
236 | //This function updates track parameters | |
237 | //------------------------------------------------------------------ | |
6c94f330 | 238 | Double_t p[2]={c->GetY(), c->GetZ()}; |
239 | Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; | |
006b5f7f | 240 | |
6c94f330 | 241 | if (!AliExternalTrackParam::Update(p,cov)) return kFALSE; |
006b5f7f | 242 | |
28d5b13d | 243 | Int_t n=GetNumberOfClusters(); |
006b5f7f | 244 | if (!Invariant()) { |
28d5b13d | 245 | if (n>fgkWARN) AliWarning("Wrong invariant !"); |
6c94f330 | 246 | return kFALSE; |
006b5f7f | 247 | } |
248 | ||
6c94f330 | 249 | if (chi2<0) return kTRUE; |
67c3dcbe | 250 | |
150f264c | 251 | AliTracker::FillResiduals(this,p,cov,c->GetVolumeId()); |
252 | ||
006b5f7f | 253 | fIndex[n]=index; |
254 | SetNumberOfClusters(n+1); | |
255 | SetChi2(GetChi2()+chi2); | |
256 | ||
6c94f330 | 257 | return kTRUE; |
006b5f7f | 258 | } |
259 | ||
6c94f330 | 260 | Bool_t AliITStrackV2::Invariant() const { |
006b5f7f | 261 | //------------------------------------------------------------------ |
262 | // This function is for debugging purpose only | |
263 | //------------------------------------------------------------------ | |
7f6ddf58 | 264 | Int_t n=GetNumberOfClusters(); |
6c94f330 | 265 | |
8a84886c | 266 | // take into account the misalignment error |
267 | Float_t maxMisalErrY2=0,maxMisalErrZ2=0; | |
268 | for (Int_t lay=0; lay<AliITSgeomTGeo::kNLayers; lay++) { | |
269 | maxMisalErrY2 = TMath::Max(maxMisalErrY2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(lay)); | |
270 | maxMisalErrZ2 = TMath::Max(maxMisalErrZ2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(lay)); | |
271 | } | |
272 | maxMisalErrY2 *= maxMisalErrY2; | |
273 | maxMisalErrZ2 *= maxMisalErrZ2; | |
274 | // this is because when we reset before refitting, we multiply the | |
275 | // matrix by 10 | |
276 | maxMisalErrY2 *= 10.; | |
277 | maxMisalErrZ2 *= 10.; | |
278 | ||
6c94f330 | 279 | Double_t sP2=GetParameter()[2]; |
280 | if (TMath::Abs(sP2) >= kAlmost1){ | |
8602c008 | 281 | if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2); |
6c94f330 | 282 | return kFALSE; |
a9a2d814 | 283 | } |
6c94f330 | 284 | Double_t sC00=GetCovariance()[0]; |
8a84886c | 285 | if (sC00<=0 || sC00>(9.+maxMisalErrY2)) { |
8602c008 | 286 | if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00); |
6c94f330 | 287 | return kFALSE; |
a9a2d814 | 288 | } |
6c94f330 | 289 | Double_t sC11=GetCovariance()[2]; |
8a84886c | 290 | if (sC11<=0 || sC11>(9.+maxMisalErrZ2)) { |
8602c008 | 291 | if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11); |
6c94f330 | 292 | return kFALSE; |
a9a2d814 | 293 | } |
6c94f330 | 294 | Double_t sC22=GetCovariance()[5]; |
295 | if (sC22<=0 || sC22>1.) { | |
8602c008 | 296 | if (n>fgkWARN) Warning("Invariant","fC22=%f\n",sC22); |
6c94f330 | 297 | return kFALSE; |
a9a2d814 | 298 | } |
6c94f330 | 299 | Double_t sC33=GetCovariance()[9]; |
300 | if (sC33<=0 || sC33>1.) { | |
8602c008 | 301 | if (n>fgkWARN) Warning("Invariant","fC33=%f\n",sC33); |
6c94f330 | 302 | return kFALSE; |
a9a2d814 | 303 | } |
6c94f330 | 304 | Double_t sC44=GetCovariance()[14]; |
305 | if (sC44<=0 /*|| sC44>6e-5*/) { | |
8602c008 | 306 | if (n>fgkWARN) Warning("Invariant","fC44=%f\n",sC44); |
6c94f330 | 307 | return kFALSE; |
14825d5a | 308 | } |
6c94f330 | 309 | |
310 | return kTRUE; | |
006b5f7f | 311 | } |
312 | ||
313 | //____________________________________________________________________________ | |
6c94f330 | 314 | Bool_t AliITStrackV2::Propagate(Double_t alp,Double_t xk) { |
006b5f7f | 315 | //------------------------------------------------------------------ |
316 | //This function propagates a track | |
317 | //------------------------------------------------------------------ | |
6c94f330 | 318 | Double_t bz=GetBz(); |
319 | if (!AliExternalTrackParam::Propagate(alp,xk,bz)) return kFALSE; | |
006b5f7f | 320 | |
006b5f7f | 321 | if (!Invariant()) { |
8a84886c | 322 | Int_t n=GetNumberOfClusters(); |
323 | if (n>fgkWARN) AliWarning("Wrong invariant !"); | |
324 | return kFALSE; | |
791f9a2a | 325 | } |
326 | ||
6c94f330 | 327 | return kTRUE; |
a9a2d814 | 328 | } |
006b5f7f | 329 | |
afd25725 | 330 | Bool_t AliITStrackV2::MeanBudgetToPrimVertex(Double_t xyz[3], Double_t step, Double_t &d) const { |
331 | ||
332 | //------------------------------------------------------------------- | |
333 | // Get the mean material budget between the actual point and the | |
334 | // primary vertex. (L.Gaudichet) | |
335 | //------------------------------------------------------------------- | |
336 | ||
337 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); | |
338 | Double_t vertexX = xyz[0]*cs + xyz[1]*sn; | |
339 | ||
340 | Int_t nstep = Int_t((GetX()-vertexX)/step); | |
341 | if (nstep<1) nstep = 1; | |
342 | step = (GetX()-vertexX)/nstep; | |
343 | ||
c7719399 | 344 | // Double_t mparam[7], densMean=0, radLength=0, length=0; |
345 | Double_t mparam[7]; | |
afd25725 | 346 | Double_t p1[3], p2[3], x = GetX(), bz = GetBz(); |
347 | GetXYZ(p1); | |
348 | ||
349 | d=0.; | |
350 | ||
351 | for (Int_t i=0; i<nstep; i++) { | |
352 | x += step; | |
353 | if (!GetXYZAt(x, bz, p2)) return kFALSE; | |
354 | AliTracker::MeanMaterialBudget(p1, p2, mparam); | |
355 | if (mparam[1]>900000) return kFALSE; | |
356 | d += mparam[1]; | |
357 | ||
358 | p1[0] = p2[0]; | |
359 | p1[1] = p2[1]; | |
360 | p1[2] = p2[2]; | |
361 | } | |
362 | ||
363 | return kTRUE; | |
364 | } | |
365 | ||
6c94f330 | 366 | Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) { |
babd135a | 367 | //------------------------------------------------------------------ |
6c94f330 | 368 | //This function improves angular track parameters |
babd135a | 369 | //------------------------------------------------------------------ |
6c94f330 | 370 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); |
371 | //Double_t xv = xyz[0]*cs + xyz[1]*sn; // vertex | |
372 | Double_t yv =-xyz[0]*sn + xyz[1]*cs; // in the | |
373 | Double_t zv = xyz[2]; // local frame | |
babd135a | 374 | |
6c94f330 | 375 | Double_t dy = Par(0) - yv, dz = Par(1) - zv; |
376 | Double_t r2=GetX()*GetX() + dy*dy; | |
6c23ffed | 377 | Double_t p2=(1.+ GetTgl()*GetTgl())/(GetSigned1Pt()*GetSigned1Pt()); |
a9a2d814 | 378 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
379 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); | |
8676d691 | 380 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; |
381 | //Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33; | |
6c94f330 | 382 | |
383 | Double_t cnv=GetBz()*kB2C; | |
a9a2d814 | 384 | { |
6c94f330 | 385 | Double_t dummy = 4/r2 - GetC()*GetC(); |
386 | if (dummy < 0) return kFALSE; | |
387 | Double_t parp = 0.5*(GetC()*GetX() + dy*TMath::Sqrt(dummy)); | |
388 | Double_t sigma2p = theta2*(1.- GetSnp()*GetSnp())*(1. + GetTgl()*GetTgl()); | |
389 | sigma2p += Cov(0)/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2); | |
390 | sigma2p += ers[1]*ers[1]/r2; | |
391 | sigma2p += 0.25*Cov(14)*cnv*cnv*GetX()*GetX(); | |
00709873 | 392 | Double_t eps2p=sigma2p/(Cov(5) + sigma2p); |
6c94f330 | 393 | Par(0) += Cov(3)/(Cov(5) + sigma2p)*(parp - GetSnp()); |
394 | Par(2) = eps2p*GetSnp() + (1 - eps2p)*parp; | |
395 | Cov(5) *= eps2p; | |
396 | Cov(3) *= eps2p; | |
a9a2d814 | 397 | } |
398 | { | |
6c94f330 | 399 | Double_t parl=0.5*GetC()*dz/TMath::ASin(0.5*GetC()*TMath::Sqrt(r2)); |
400 | Double_t sigma2l=theta2; | |
401 | sigma2l += Cov(2)/r2 + Cov(0)*dy*dy*dz*dz/(r2*r2*r2); | |
402 | sigma2l += ers[2]*ers[2]/r2; | |
403 | Double_t eps2l = sigma2l/(Cov(9) + sigma2l); | |
404 | Par(1) += Cov(7 )/(Cov(9) + sigma2l)*(parl - Par(3)); | |
405 | Par(4) += Cov(13)/(Cov(9) + sigma2l)*(parl - Par(3)); | |
406 | Par(3) = eps2l*Par(3) + (1-eps2l)*parl; | |
407 | Cov(9) *= eps2l; | |
00709873 | 408 | Cov(13)*= eps2l; |
6c94f330 | 409 | Cov(7) *= eps2l; |
a9a2d814 | 410 | } |
6c94f330 | 411 | if (!Invariant()) return kFALSE; |
14825d5a | 412 | |
6c94f330 | 413 | return kTRUE; |
14825d5a | 414 | } |
23efe5f1 | 415 | |
416 | void AliITStrackV2::CookdEdx(Double_t low, Double_t up) { | |
417 | //----------------------------------------------------------------- | |
a9a2d814 | 418 | // This function calculates dE/dX within the "low" and "up" cuts. |
419 | // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
23efe5f1 | 420 | //----------------------------------------------------------------- |
23efe5f1 | 421 | // The clusters order is: SSD-2, SSD-1, SDD-2, SDD-1, SPD-2, SPD-1 |
c0dd5278 | 422 | |
423 | Int_t i; | |
424 | Int_t nc=0; | |
425 | for (i=0; i<GetNumberOfClusters(); i++) { | |
426 | Int_t idx=GetClusterIndex(i); | |
427 | idx=(idx&0xf0000000)>>28; | |
428 | if (idx>1) nc++; // Take only SSD and SDD | |
429 | } | |
23efe5f1 | 430 | |
a9a2d814 | 431 | Int_t swap;//stupid sorting |
23efe5f1 | 432 | do { |
433 | swap=0; | |
434 | for (i=0; i<nc-1; i++) { | |
435 | if (fdEdxSample[i]<=fdEdxSample[i+1]) continue; | |
436 | Float_t tmp=fdEdxSample[i]; | |
437 | fdEdxSample[i]=fdEdxSample[i+1]; fdEdxSample[i+1]=tmp; | |
438 | swap++; | |
439 | } | |
440 | } while (swap); | |
441 | ||
a9a2d814 | 442 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); //b.b. to take two lowest dEdX |
443 | // values from four ones choose | |
444 | // nu=2 | |
23efe5f1 | 445 | Float_t dedx=0; |
a9a2d814 | 446 | for (i=nl; i<nu; i++) dedx += fdEdxSample[i]; |
c0dd5278 | 447 | if (nu-nl>0) dedx /= (nu-nl); |
23efe5f1 | 448 | |
23efe5f1 | 449 | SetdEdx(dedx); |
450 | } | |
c7bafca9 | 451 | |
8602c008 | 452 | //____________________________________________________________________________ |
453 | Bool_t AliITStrackV2:: | |
e50912db | 454 | GetPhiZat(Double_t r, Double_t &phi, Double_t &z) const { |
455 | //------------------------------------------------------------------ | |
456 | // This function returns the global cylindrical (phi,z) of the track | |
457 | // position estimated at the radius r. | |
458 | // The track curvature is neglected. | |
459 | //------------------------------------------------------------------ | |
460 | Double_t d=GetD(0.,0.); | |
461 | if (TMath::Abs(d) > r) return kFALSE; | |
462 | ||
463 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); | |
464 | if (TMath::Abs(d) > rcurr) return kFALSE; | |
465 | Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp()); | |
466 | ||
467 | phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
c7de5c65 | 468 | z=GetZ()+GetTgl()*(TMath::Sqrt((r-d)*(r+d))-TMath::Sqrt((rcurr-d)*(rcurr+d))); |
e50912db | 469 | return kTRUE; |
470 | } | |
471 | //____________________________________________________________________________ | |
472 | Bool_t AliITStrackV2:: | |
473 | GetLocalXat(Double_t r,Double_t &xloc) const { | |
8602c008 | 474 | //------------------------------------------------------------------ |
e50912db | 475 | // This function returns the local x of the track |
476 | // position estimated at the radius r. | |
8602c008 | 477 | // The track curvature is neglected. |
478 | //------------------------------------------------------------------ | |
479 | Double_t d=GetD(0.,0.); | |
e50912db | 480 | if (TMath::Abs(d) > r) return kFALSE; |
8602c008 | 481 | |
e50912db | 482 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); |
483 | Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp()); | |
484 | Double_t phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
8602c008 | 485 | |
e50912db | 486 | xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha()) |
487 | +TMath::Sin(phi)*TMath::Sin(GetAlpha())); | |
8602c008 | 488 | |
489 | return kTRUE; | |
490 | } |