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