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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" | |
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(), |
545af9ef | 40 | fCheckInvariant(kTRUE), |
22b13da0 | 41 | fdEdx(0), |
83d73500 | 42 | fESDtrack(0) |
e43c066c | 43 | { |
ae00569a | 44 | for(Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) {fIndex[i]=-1; fModule[i]=-1;} |
45 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; | |
e43c066c | 46 | } |
47 | ||
83d73500 | 48 | |
83d73500 | 49 | //____________________________________________________________________________ |
67c3dcbe | 50 | AliITStrackV2::AliITStrackV2(AliESDtrack& t,Bool_t c) throw (const Char_t *) : |
6c94f330 | 51 | AliKalmanTrack(), |
545af9ef | 52 | fCheckInvariant(kTRUE), |
6c94f330 | 53 | fdEdx(t.GetITSsignal()), |
54 | fESDtrack(&t) | |
55 | { | |
83d73500 | 56 | //------------------------------------------------------------------ |
67c3dcbe | 57 | // Conversion ESD track -> ITS track. |
58 | // If c==kTRUE, create the ITS track out of the constrained params. | |
83d73500 | 59 | //------------------------------------------------------------------ |
6c94f330 | 60 | const AliExternalTrackParam *par=&t; |
61 | if (c) { | |
6c4ef2ed | 62 | par=t.GetConstrainedParam(); |
6c94f330 | 63 | if (!par) throw "AliITStrackV2: conversion failed !\n"; |
64 | } | |
65 | Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance()); | |
66 | ||
67 | //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; | |
68 | ||
83d73500 | 69 | SetLabel(t.GetLabel()); |
70 | SetMass(t.GetMass()); | |
6c94f330 | 71 | SetNumberOfClusters(t.GetITSclusters(fIndex)); |
006b5f7f | 72 | |
83d73500 | 73 | if (t.GetStatus()&AliESDtrack::kTIME) { |
74 | StartTimeIntegral(); | |
75 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
76 | SetIntegratedLength(t.GetIntegratedLength()); | |
77 | } | |
e43c066c | 78 | |
68b8060b | 79 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; |
006b5f7f | 80 | } |
81 | ||
7ac23097 | 82 | //____________________________________________________________________________ |
83 | void AliITStrackV2::ResetClusters() { | |
84 | //------------------------------------------------------------------ | |
85 | // Reset the array of attached clusters. | |
86 | //------------------------------------------------------------------ | |
87 | for (Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) fIndex[i]=-1; | |
88 | SetChi2(0.); | |
89 | SetNumberOfClusters(0); | |
90 | } | |
91 | ||
09cf9d66 | 92 | //____________________________________________________________________________ |
15dd636f | 93 | void AliITStrackV2::UpdateESDtrack(ULong_t flags) const { |
09cf9d66 | 94 | // Update track params |
83d73500 | 95 | fESDtrack->UpdateTrackParams(this,flags); |
ae00569a | 96 | // copy the module indices |
97 | for(Int_t i=0;i<12;i++) { | |
98 | // printf(" %d\n",GetModuleIndex(i)); | |
99 | fESDtrack->SetITSModuleIndex(i,GetModuleIndex(i)); | |
100 | } | |
09cf9d66 | 101 | // copy the 4 dedx samples |
102 | Double_t sdedx[4]={0.,0.,0.,0.}; | |
103 | for(Int_t i=0; i<4; i++) sdedx[i]=fdEdxSample[i]; | |
104 | fESDtrack->SetITSdEdxSamples(sdedx); | |
83d73500 | 105 | } |
106 | ||
006b5f7f | 107 | //____________________________________________________________________________ |
6c94f330 | 108 | AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) : |
109 | AliKalmanTrack(t), | |
545af9ef | 110 | fCheckInvariant(t.fCheckInvariant), |
6c94f330 | 111 | fdEdx(t.fdEdx), |
112 | fESDtrack(t.fESDtrack) | |
113 | { | |
006b5f7f | 114 | //------------------------------------------------------------------ |
115 | //Copy constructor | |
116 | //------------------------------------------------------------------ | |
ef7253ac | 117 | Int_t i; |
ef7253ac | 118 | for (i=0; i<4; i++) fdEdxSample[i]=t.fdEdxSample[i]; |
ae00569a | 119 | for (i=0; i<2*AliITSgeomTGeo::GetNLayers(); i++) { |
120 | fIndex[i]=t.fIndex[i]; | |
121 | fModule[i]=t.fModule[i]; | |
122 | } | |
006b5f7f | 123 | } |
a9a2d814 | 124 | |
006b5f7f | 125 | //_____________________________________________________________________________ |
126 | Int_t AliITStrackV2::Compare(const TObject *o) const { | |
127 | //----------------------------------------------------------------- | |
128 | // This function compares tracks according to the their curvature | |
129 | //----------------------------------------------------------------- | |
7f6ddf58 | 130 | AliITStrackV2 *t=(AliITStrackV2*)o; |
6c23ffed | 131 | //Double_t co=OneOverPt(); |
132 | //Double_t c =OneOverPt(); | |
15dd636f | 133 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); |
134 | Double_t c =GetSigmaY2()*GetSigmaZ2(); | |
006b5f7f | 135 | if (c>co) return 1; |
136 | else if (c<co) return -1; | |
137 | return 0; | |
138 | } | |
139 | ||
006b5f7f | 140 | //____________________________________________________________________________ |
6c94f330 | 141 | Bool_t |
142 | AliITStrackV2::PropagateToVertex(const AliESDVertex *v,Double_t d,Double_t x0) | |
143 | { | |
006b5f7f | 144 | //------------------------------------------------------------------ |
145 | //This function propagates a track to the minimal distance from the origin | |
6c94f330 | 146 | //------------------------------------------------------------------ |
147 | Double_t bz=GetBz(); | |
e50912db | 148 | if (PropagateToDCA(v,bz,kVeryBig)) { |
149 | Double_t xOverX0,xTimesRho; | |
150 | xOverX0 = d; xTimesRho = d*x0; | |
151 | if (CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kTRUE; | |
152 | } | |
6c94f330 | 153 | return kFALSE; |
006b5f7f | 154 | } |
155 | ||
156 | //____________________________________________________________________________ | |
6c94f330 | 157 | Bool_t AliITStrackV2:: |
e50912db | 158 | GetGlobalXYZat(Double_t xloc, Double_t &x, Double_t &y, Double_t &z) const { |
006b5f7f | 159 | //------------------------------------------------------------------ |
160 | //This function returns a track position in the global system | |
161 | //------------------------------------------------------------------ | |
6c94f330 | 162 | Double_t r[3]; |
f7a1cc68 | 163 | Bool_t rc=GetXYZAt(xloc, GetBz(), r); |
6c94f330 | 164 | x=r[0]; y=r[1]; z=r[2]; |
165 | return rc; | |
006b5f7f | 166 | } |
167 | ||
168 | //_____________________________________________________________________________ | |
6c94f330 | 169 | Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const { |
006b5f7f | 170 | //----------------------------------------------------------------- |
171 | // This function calculates a predicted chi2 increment. | |
172 | //----------------------------------------------------------------- | |
6c94f330 | 173 | Double_t p[2]={c->GetY(), c->GetZ()}; |
174 | Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; | |
175 | return AliExternalTrackParam::GetPredictedChi2(p,cov); | |
a9a2d814 | 176 | } |
177 | ||
178 | //____________________________________________________________________________ | |
6c94f330 | 179 | Bool_t AliITStrackV2::PropagateTo(Double_t xk, Double_t d, Double_t x0) { |
006b5f7f | 180 | //------------------------------------------------------------------ |
181 | //This function propagates a track | |
182 | //------------------------------------------------------------------ | |
afd25725 | 183 | |
6c94f330 | 184 | Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ(); |
006b5f7f | 185 | |
1defa402 | 186 | //Double_t bz=GetBz(); |
187 | //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE; | |
188 | Double_t b[3]; GetBxByBz(b); | |
189 | if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE; | |
e50912db | 190 | Double_t xOverX0,xTimesRho; |
191 | xOverX0 = d; xTimesRho = d*x0; | |
192 | if (!CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kFALSE; | |
006b5f7f | 193 | |
dd44614b | 194 | Double_t x=GetX(), y=GetY(), z=GetZ(); |
6c94f330 | 195 | if (IsStartedTimeIntegral() && x>oldX) { |
196 | Double_t l2 = (x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ); | |
f29dbb4b | 197 | AddTimeStep(TMath::Sqrt(l2)); |
198 | } | |
f29dbb4b | 199 | |
6c94f330 | 200 | return kTRUE; |
006b5f7f | 201 | } |
202 | ||
afd25725 | 203 | //____________________________________________________________________________ |
db355ee7 | 204 | Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho, Bool_t addTime) { |
afd25725 | 205 | //------------------------------------------------------------------- |
206 | // Propagates the track to a reference plane x=xToGo in n steps. | |
207 | // These n steps are only used to take into account the curvature. | |
208 | // The material is calculated with TGeo. (L.Gaudichet) | |
209 | //------------------------------------------------------------------- | |
210 | ||
211 | Double_t startx = GetX(), starty = GetY(), startz = GetZ(); | |
212 | Double_t sign = (startx<xToGo) ? -1.:1.; | |
213 | Double_t step = (xToGo-startx)/TMath::Abs(nstep); | |
214 | ||
1defa402 | 215 | Double_t start[3], end[3], mparam[7]; |
216 | //Double_t bz = GetBz(); | |
217 | Double_t b[3]; GetBxByBz(b); | |
218 | Double_t bz = b[2]; | |
219 | ||
afd25725 | 220 | Double_t x = startx; |
221 | ||
222 | for (Int_t i=0; i<nstep; i++) { | |
223 | ||
224 | GetXYZ(start); //starting global position | |
225 | x += step; | |
226 | if (!GetXYZAt(x, bz, end)) return kFALSE; | |
1defa402 | 227 | //if (!AliExternalTrackParam::PropagateTo(x, bz)) return kFALSE; |
228 | if (!AliExternalTrackParam::PropagateToBxByBz(x, b)) return kFALSE; | |
afd25725 | 229 | AliTracker::MeanMaterialBudget(start, end, mparam); |
8fc9f3dc | 230 | xTimesRho = sign*mparam[4]*mparam[0]; |
231 | xOverX0 = mparam[1]; | |
afd25725 | 232 | if (mparam[1]<900000) { |
afd25725 | 233 | if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0, |
8fc9f3dc | 234 | xTimesRho,GetMass())) return kFALSE; |
235 | } else { // this happens when MeanMaterialBudget cannot cross a boundary | |
236 | return kFALSE; | |
afd25725 | 237 | } |
238 | } | |
239 | ||
db355ee7 | 240 | if (addTime && IsStartedTimeIntegral() && GetX()>startx) { |
afd25725 | 241 | Double_t l2 = ( (GetX()-startx)*(GetX()-startx) + |
242 | (GetY()-starty)*(GetY()-starty) + | |
243 | (GetZ()-startz)*(GetZ()-startz) ); | |
244 | AddTimeStep(TMath::Sqrt(l2)); | |
245 | } | |
246 | ||
247 | return kTRUE; | |
248 | } | |
249 | ||
006b5f7f | 250 | //____________________________________________________________________________ |
6c94f330 | 251 | Bool_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, Int_t index) |
252 | { | |
006b5f7f | 253 | //------------------------------------------------------------------ |
254 | //This function updates track parameters | |
255 | //------------------------------------------------------------------ | |
6c94f330 | 256 | Double_t p[2]={c->GetY(), c->GetZ()}; |
d9ead1a0 | 257 | Double_t cov[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()}; |
006b5f7f | 258 | |
6c94f330 | 259 | if (!AliExternalTrackParam::Update(p,cov)) return kFALSE; |
006b5f7f | 260 | |
28d5b13d | 261 | Int_t n=GetNumberOfClusters(); |
006b5f7f | 262 | if (!Invariant()) { |
28d5b13d | 263 | if (n>fgkWARN) AliWarning("Wrong invariant !"); |
6c94f330 | 264 | return kFALSE; |
006b5f7f | 265 | } |
266 | ||
6c94f330 | 267 | if (chi2<0) return kTRUE; |
67c3dcbe | 268 | |
b5205c90 | 269 | // fill residuals for ITS+TPC tracks |
badb951a | 270 | if (fESDtrack) { |
271 | if (fESDtrack->GetStatus()&AliESDtrack::kTPCin) { | |
272 | AliTracker::FillResiduals(this,p,cov,c->GetVolumeId()); | |
273 | } | |
b5205c90 | 274 | } |
150f264c | 275 | |
006b5f7f | 276 | fIndex[n]=index; |
277 | SetNumberOfClusters(n+1); | |
278 | SetChi2(GetChi2()+chi2); | |
279 | ||
6c94f330 | 280 | return kTRUE; |
006b5f7f | 281 | } |
282 | ||
6c94f330 | 283 | Bool_t AliITStrackV2::Invariant() const { |
006b5f7f | 284 | //------------------------------------------------------------------ |
285 | // This function is for debugging purpose only | |
286 | //------------------------------------------------------------------ | |
545af9ef | 287 | if(!fCheckInvariant) return kTRUE; |
288 | ||
7f6ddf58 | 289 | Int_t n=GetNumberOfClusters(); |
6c94f330 | 290 | |
8a84886c | 291 | // take into account the misalignment error |
292 | Float_t maxMisalErrY2=0,maxMisalErrZ2=0; | |
293 | for (Int_t lay=0; lay<AliITSgeomTGeo::kNLayers; lay++) { | |
d9ead1a0 | 294 | maxMisalErrY2 = TMath::Max(maxMisalErrY2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(lay,GetBz())); |
295 | maxMisalErrZ2 = TMath::Max(maxMisalErrZ2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(lay,GetBz())); | |
8a84886c | 296 | } |
297 | maxMisalErrY2 *= maxMisalErrY2; | |
298 | maxMisalErrZ2 *= maxMisalErrZ2; | |
299 | // this is because when we reset before refitting, we multiply the | |
300 | // matrix by 10 | |
301 | maxMisalErrY2 *= 10.; | |
302 | maxMisalErrZ2 *= 10.; | |
303 | ||
6c94f330 | 304 | Double_t sP2=GetParameter()[2]; |
305 | if (TMath::Abs(sP2) >= kAlmost1){ | |
8602c008 | 306 | if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2); |
6c94f330 | 307 | return kFALSE; |
a9a2d814 | 308 | } |
6c94f330 | 309 | Double_t sC00=GetCovariance()[0]; |
8a84886c | 310 | if (sC00<=0 || sC00>(9.+maxMisalErrY2)) { |
8602c008 | 311 | if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00); |
6c94f330 | 312 | return kFALSE; |
a9a2d814 | 313 | } |
6c94f330 | 314 | Double_t sC11=GetCovariance()[2]; |
8a84886c | 315 | if (sC11<=0 || sC11>(9.+maxMisalErrZ2)) { |
8602c008 | 316 | if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11); |
6c94f330 | 317 | return kFALSE; |
a9a2d814 | 318 | } |
6c94f330 | 319 | Double_t sC22=GetCovariance()[5]; |
320 | if (sC22<=0 || sC22>1.) { | |
8602c008 | 321 | if (n>fgkWARN) Warning("Invariant","fC22=%f\n",sC22); |
6c94f330 | 322 | return kFALSE; |
a9a2d814 | 323 | } |
6c94f330 | 324 | Double_t sC33=GetCovariance()[9]; |
325 | if (sC33<=0 || sC33>1.) { | |
8602c008 | 326 | if (n>fgkWARN) Warning("Invariant","fC33=%f\n",sC33); |
6c94f330 | 327 | return kFALSE; |
a9a2d814 | 328 | } |
6c94f330 | 329 | Double_t sC44=GetCovariance()[14]; |
330 | if (sC44<=0 /*|| sC44>6e-5*/) { | |
8602c008 | 331 | if (n>fgkWARN) Warning("Invariant","fC44=%f\n",sC44); |
6c94f330 | 332 | return kFALSE; |
14825d5a | 333 | } |
6c94f330 | 334 | |
335 | return kTRUE; | |
006b5f7f | 336 | } |
337 | ||
338 | //____________________________________________________________________________ | |
6c94f330 | 339 | Bool_t AliITStrackV2::Propagate(Double_t alp,Double_t xk) { |
006b5f7f | 340 | //------------------------------------------------------------------ |
341 | //This function propagates a track | |
342 | //------------------------------------------------------------------ | |
1defa402 | 343 | //Double_t bz=GetBz(); |
344 | //if (!AliExternalTrackParam::Propagate(alp,xk,bz)) return kFALSE; | |
345 | Double_t b[3]; GetBxByBz(b); | |
346 | if (!AliExternalTrackParam::PropagateBxByBz(alp,xk,b)) return kFALSE; | |
006b5f7f | 347 | |
006b5f7f | 348 | if (!Invariant()) { |
8a84886c | 349 | Int_t n=GetNumberOfClusters(); |
350 | if (n>fgkWARN) AliWarning("Wrong invariant !"); | |
351 | return kFALSE; | |
791f9a2a | 352 | } |
353 | ||
6c94f330 | 354 | return kTRUE; |
a9a2d814 | 355 | } |
006b5f7f | 356 | |
afd25725 | 357 | Bool_t AliITStrackV2::MeanBudgetToPrimVertex(Double_t xyz[3], Double_t step, Double_t &d) const { |
358 | ||
359 | //------------------------------------------------------------------- | |
360 | // Get the mean material budget between the actual point and the | |
361 | // primary vertex. (L.Gaudichet) | |
362 | //------------------------------------------------------------------- | |
363 | ||
364 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); | |
365 | Double_t vertexX = xyz[0]*cs + xyz[1]*sn; | |
366 | ||
367 | Int_t nstep = Int_t((GetX()-vertexX)/step); | |
368 | if (nstep<1) nstep = 1; | |
369 | step = (GetX()-vertexX)/nstep; | |
370 | ||
c7719399 | 371 | // Double_t mparam[7], densMean=0, radLength=0, length=0; |
372 | Double_t mparam[7]; | |
afd25725 | 373 | Double_t p1[3], p2[3], x = GetX(), bz = GetBz(); |
374 | GetXYZ(p1); | |
375 | ||
376 | d=0.; | |
377 | ||
378 | for (Int_t i=0; i<nstep; i++) { | |
379 | x += step; | |
380 | if (!GetXYZAt(x, bz, p2)) return kFALSE; | |
381 | AliTracker::MeanMaterialBudget(p1, p2, mparam); | |
382 | if (mparam[1]>900000) return kFALSE; | |
383 | d += mparam[1]; | |
384 | ||
385 | p1[0] = p2[0]; | |
386 | p1[1] = p2[1]; | |
387 | p1[2] = p2[2]; | |
388 | } | |
389 | ||
390 | return kTRUE; | |
391 | } | |
392 | ||
6c94f330 | 393 | Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) { |
babd135a | 394 | //------------------------------------------------------------------ |
6c94f330 | 395 | //This function improves angular track parameters |
babd135a | 396 | //------------------------------------------------------------------ |
86be8934 | 397 | //Store the initail track parameters |
398 | ||
399 | return kTRUE; //PH temporary switched off | |
400 | ||
401 | Double_t x = GetX(); | |
402 | Double_t alpha = GetAlpha(); | |
403 | Double_t par[] = {GetY(),GetZ(),GetSnp(),GetTgl(),GetSigned1Pt()}; | |
404 | Double_t cov[] = { | |
405 | GetSigmaY2(), | |
406 | GetSigmaZY(), | |
407 | GetSigmaZ2(), | |
408 | GetSigmaSnpY(), | |
409 | GetSigmaSnpZ(), | |
410 | GetSigmaSnp2(), | |
411 | GetSigmaTglY(), | |
412 | GetSigmaTglZ(), | |
413 | GetSigmaTglSnp(), | |
414 | GetSigmaTgl2(), | |
415 | GetSigma1PtY(), | |
416 | GetSigma1PtZ(), | |
417 | GetSigma1PtSnp(), | |
418 | GetSigma1PtTgl(), | |
419 | GetSigma1Pt2() | |
420 | }; | |
421 | ||
422 | ||
6c94f330 | 423 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); |
424 | //Double_t xv = xyz[0]*cs + xyz[1]*sn; // vertex | |
425 | Double_t yv =-xyz[0]*sn + xyz[1]*cs; // in the | |
426 | Double_t zv = xyz[2]; // local frame | |
babd135a | 427 | |
86be8934 | 428 | Double_t dy = par[0] - yv, dz = par[1] - zv; |
6c94f330 | 429 | Double_t r2=GetX()*GetX() + dy*dy; |
6c23ffed | 430 | Double_t p2=(1.+ GetTgl()*GetTgl())/(GetSigned1Pt()*GetSigned1Pt()); |
a9a2d814 | 431 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
432 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); | |
8676d691 | 433 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; |
434 | //Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33; | |
6c94f330 | 435 | |
436 | Double_t cnv=GetBz()*kB2C; | |
a9a2d814 | 437 | { |
6c94f330 | 438 | Double_t dummy = 4/r2 - GetC()*GetC(); |
439 | if (dummy < 0) return kFALSE; | |
440 | Double_t parp = 0.5*(GetC()*GetX() + dy*TMath::Sqrt(dummy)); | |
bfd20868 | 441 | Double_t sigma2p = theta2*(1.-GetSnp())*(1.+GetSnp())*(1. + GetTgl()*GetTgl()); |
442 | Double_t ovSqr2 = 1./TMath::Sqrt(r2); | |
443 | Double_t tfact = ovSqr2*(1.-dy*ovSqr2)*(1.+dy*ovSqr2); | |
86be8934 | 444 | sigma2p += cov[0]*tfact*tfact; |
6c94f330 | 445 | sigma2p += ers[1]*ers[1]/r2; |
86be8934 | 446 | sigma2p += 0.25*cov[14]*cnv*cnv*GetX()*GetX(); |
447 | Double_t eps2p=sigma2p/(cov[5] + sigma2p); | |
448 | par[0] += cov[3]/(cov[5] + sigma2p)*(parp - GetSnp()); | |
449 | par[2] = eps2p*GetSnp() + (1 - eps2p)*parp; | |
450 | cov[5] *= eps2p; | |
451 | cov[3] *= eps2p; | |
a9a2d814 | 452 | } |
453 | { | |
6c94f330 | 454 | Double_t parl=0.5*GetC()*dz/TMath::ASin(0.5*GetC()*TMath::Sqrt(r2)); |
455 | Double_t sigma2l=theta2; | |
86be8934 | 456 | sigma2l += cov[2]/r2 + cov[0]*dy*dy*dz*dz/(r2*r2*r2); |
6c94f330 | 457 | sigma2l += ers[2]*ers[2]/r2; |
86be8934 | 458 | Double_t eps2l = sigma2l/(cov[9] + sigma2l); |
459 | par[1] += cov[7 ]/(cov[9] + sigma2l)*(parl - par[3]); | |
460 | par[4] += cov[13]/(cov[9] + sigma2l)*(parl - par[3]); | |
461 | par[3] = eps2l*par[3] + (1-eps2l)*parl; | |
462 | cov[9] *= eps2l; | |
463 | cov[13]*= eps2l; | |
464 | cov[7] *= eps2l; | |
a9a2d814 | 465 | } |
86be8934 | 466 | |
467 | Set(x,alpha,par,cov); | |
468 | ||
6c94f330 | 469 | if (!Invariant()) return kFALSE; |
14825d5a | 470 | |
6c94f330 | 471 | return kTRUE; |
14825d5a | 472 | } |
23efe5f1 | 473 | |
474 | void AliITStrackV2::CookdEdx(Double_t low, Double_t up) { | |
475 | //----------------------------------------------------------------- | |
a9a2d814 | 476 | // This function calculates dE/dX within the "low" and "up" cuts. |
477 | // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
09cf9d66 | 478 | // Updated: F. Prino 8-June-2009 |
23efe5f1 | 479 | //----------------------------------------------------------------- |
09cf9d66 | 480 | // The cluster order is: SDD-1, SDD-2, SSD-1, SSD-2 |
c0dd5278 | 481 | |
c0dd5278 | 482 | Int_t nc=0; |
09cf9d66 | 483 | Float_t dedx[4]; |
484 | for (Int_t il=0; il<4; il++) { // count good (>0) dE/dx values | |
485 | if(fdEdxSample[il]>0.){ | |
486 | dedx[nc]= fdEdxSample[il]; | |
487 | nc++; | |
488 | } | |
489 | } | |
490 | if(nc<1){ | |
491 | SetdEdx(0.); | |
492 | return; | |
c0dd5278 | 493 | } |
23efe5f1 | 494 | |
09cf9d66 | 495 | Int_t swap; // sort in ascending order |
23efe5f1 | 496 | do { |
497 | swap=0; | |
09cf9d66 | 498 | for (Int_t i=0; i<nc-1; i++) { |
499 | if (dedx[i]<=dedx[i+1]) continue; | |
500 | Float_t tmp=dedx[i]; | |
501 | dedx[i]=dedx[i+1]; | |
502 | dedx[i+1]=tmp; | |
23efe5f1 | 503 | swap++; |
504 | } | |
505 | } while (swap); | |
506 | ||
23efe5f1 | 507 | |
09cf9d66 | 508 | Double_t nl=low*nc, nu =up*nc; |
509 | Float_t sumamp = 0; | |
510 | Float_t sumweight =0; | |
511 | for (Int_t i=0; i<nc; i++) { | |
512 | Float_t weight =1; | |
513 | if (i<nl+0.1) weight = TMath::Max(1.-(nl-i),0.); | |
514 | if (i>nu-1) weight = TMath::Max(nu-i,0.); | |
515 | sumamp+= dedx[i]*weight; | |
516 | sumweight+=weight; | |
517 | } | |
518 | SetdEdx(sumamp/sumweight); | |
23efe5f1 | 519 | } |
c7bafca9 | 520 | |
8602c008 | 521 | //____________________________________________________________________________ |
522 | Bool_t AliITStrackV2:: | |
e50912db | 523 | GetPhiZat(Double_t r, Double_t &phi, Double_t &z) const { |
524 | //------------------------------------------------------------------ | |
525 | // This function returns the global cylindrical (phi,z) of the track | |
526 | // position estimated at the radius r. | |
527 | // The track curvature is neglected. | |
528 | //------------------------------------------------------------------ | |
529 | Double_t d=GetD(0.,0.); | |
bc02d571 | 530 | if (TMath::Abs(d) > r) { |
531 | if (r>1e-1) return kFALSE; | |
532 | r = TMath::Abs(d); | |
533 | } | |
e50912db | 534 | |
535 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); | |
494a930c | 536 | if (TMath::Abs(d) > rcurr) return kFALSE; |
537 | Double_t globXYZcurr[3]; GetXYZ(globXYZcurr); | |
538 | Double_t phicurr=TMath::ATan2(globXYZcurr[1],globXYZcurr[0]); | |
e50912db | 539 | |
2089d338 | 540 | if (GetX()>=0.) { |
541 | phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
542 | } else { | |
543 | phi=phicurr+TMath::ASin(d/r)+TMath::ASin(d/rcurr)-TMath::Pi(); | |
544 | } | |
545 | ||
494a930c | 546 | // return a phi in [0,2pi[ |
547 | if (phi<0.) phi+=2.*TMath::Pi(); | |
548 | else if (phi>=2.*TMath::Pi()) phi-=2.*TMath::Pi(); | |
c7de5c65 | 549 | z=GetZ()+GetTgl()*(TMath::Sqrt((r-d)*(r+d))-TMath::Sqrt((rcurr-d)*(rcurr+d))); |
e50912db | 550 | return kTRUE; |
551 | } | |
552 | //____________________________________________________________________________ | |
553 | Bool_t AliITStrackV2:: | |
554 | GetLocalXat(Double_t r,Double_t &xloc) const { | |
8602c008 | 555 | //------------------------------------------------------------------ |
e50912db | 556 | // This function returns the local x of the track |
557 | // position estimated at the radius r. | |
8602c008 | 558 | // The track curvature is neglected. |
559 | //------------------------------------------------------------------ | |
560 | Double_t d=GetD(0.,0.); | |
6a14afad | 561 | if (TMath::Abs(d) > r) { |
562 | if (r>1e-1) return kFALSE; | |
563 | r = TMath::Abs(d); | |
564 | } | |
8602c008 | 565 | |
e50912db | 566 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); |
494a930c | 567 | Double_t globXYZcurr[3]; GetXYZ(globXYZcurr); |
568 | Double_t phicurr=TMath::ATan2(globXYZcurr[1],globXYZcurr[0]); | |
2089d338 | 569 | Double_t phi; |
570 | if (GetX()>=0.) { | |
571 | phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
572 | } else { | |
573 | phi=phicurr+TMath::ASin(d/r)+TMath::ASin(d/rcurr)-TMath::Pi(); | |
574 | } | |
8602c008 | 575 | |
e50912db | 576 | xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha()) |
577 | +TMath::Sin(phi)*TMath::Sin(GetAlpha())); | |
8602c008 | 578 | |
579 | return kTRUE; | |
580 | } |