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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" | |
58e536c5 | 27 | #include "AliESDVertex.h" |
8a84886c | 28 | #include "AliITSReconstructor.h" |
006b5f7f | 29 | #include "AliITStrackV2.h" |
f7a1cc68 | 30 | #include "AliTracker.h" |
006b5f7f | 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(), |
545af9ef | 39 | fCheckInvariant(kTRUE), |
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;} |
25015f7a | 44 | for(Int_t i=0; i<AliITSgeomTGeo::kNLayers; i++) {fSharedWeight[i]=0;} |
ae00569a | 45 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; |
e43c066c | 46 | } |
47 | ||
83d73500 | 48 | |
83d73500 | 49 | //____________________________________________________________________________ |
763bdf3e | 50 | AliITStrackV2::AliITStrackV2(AliESDtrack& t,Bool_t c): |
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(); |
763bdf3e | 63 | if (!par) AliError("AliITStrackV2: conversion failed !\n"); |
6c94f330 | 64 | } |
65 | Set(par->GetX(),par->GetAlpha(),par->GetParameter(),par->GetCovariance()); | |
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 | |
25015f7a | 77 | for(Int_t i=0; i<AliITSgeomTGeo::kNLayers; i++) {fSharedWeight[i]=0;} |
68b8060b | 78 | for(Int_t i=0; i<4; i++) fdEdxSample[i]=0; |
006b5f7f | 79 | } |
80 | ||
7ac23097 | 81 | //____________________________________________________________________________ |
82 | void AliITStrackV2::ResetClusters() { | |
83 | //------------------------------------------------------------------ | |
84 | // Reset the array of attached clusters. | |
85 | //------------------------------------------------------------------ | |
86 | for (Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) fIndex[i]=-1; | |
25015f7a | 87 | for (Int_t i=0; i<AliITSgeomTGeo::kNLayers; i++) {fSharedWeight[i]=0;} |
7ac23097 | 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 |
25015f7a | 97 | Int_t i; |
98 | for(i=0;i<2*AliITSgeomTGeo::kNLayers;i++) { | |
ae00569a | 99 | // printf(" %d\n",GetModuleIndex(i)); |
100 | fESDtrack->SetITSModuleIndex(i,GetModuleIndex(i)); | |
101 | } | |
25015f7a | 102 | // copy the map of shared clusters |
103 | if(flags==AliESDtrack::kITSin) { | |
104 | UChar_t itsSharedMap=0; | |
105 | for(i=0;i<AliITSgeomTGeo::kNLayers;i++) { | |
63126a46 | 106 | if(fSharedWeight[i]>0) SETBIT(itsSharedMap,i); |
25015f7a | 107 | |
108 | } | |
109 | fESDtrack->SetITSSharedMap(itsSharedMap); | |
110 | } | |
25015f7a | 111 | |
09cf9d66 | 112 | // copy the 4 dedx samples |
113 | Double_t sdedx[4]={0.,0.,0.,0.}; | |
25015f7a | 114 | for(i=0; i<4; i++) sdedx[i]=fdEdxSample[i]; |
09cf9d66 | 115 | fESDtrack->SetITSdEdxSamples(sdedx); |
83d73500 | 116 | } |
117 | ||
006b5f7f | 118 | //____________________________________________________________________________ |
6c94f330 | 119 | AliITStrackV2::AliITStrackV2(const AliITStrackV2& t) : |
120 | AliKalmanTrack(t), | |
545af9ef | 121 | fCheckInvariant(t.fCheckInvariant), |
6c94f330 | 122 | fdEdx(t.fdEdx), |
123 | fESDtrack(t.fESDtrack) | |
124 | { | |
006b5f7f | 125 | //------------------------------------------------------------------ |
126 | //Copy constructor | |
127 | //------------------------------------------------------------------ | |
ef7253ac | 128 | Int_t i; |
ef7253ac | 129 | for (i=0; i<4; i++) fdEdxSample[i]=t.fdEdxSample[i]; |
ae00569a | 130 | for (i=0; i<2*AliITSgeomTGeo::GetNLayers(); i++) { |
131 | fIndex[i]=t.fIndex[i]; | |
132 | fModule[i]=t.fModule[i]; | |
133 | } | |
25015f7a | 134 | for (i=0; i<AliITSgeomTGeo::kNLayers; i++) {fSharedWeight[i]=t.fSharedWeight[i];} |
006b5f7f | 135 | } |
a9a2d814 | 136 | |
006b5f7f | 137 | //_____________________________________________________________________________ |
138 | Int_t AliITStrackV2::Compare(const TObject *o) const { | |
139 | //----------------------------------------------------------------- | |
140 | // This function compares tracks according to the their curvature | |
141 | //----------------------------------------------------------------- | |
7f6ddf58 | 142 | AliITStrackV2 *t=(AliITStrackV2*)o; |
6c23ffed | 143 | //Double_t co=OneOverPt(); |
144 | //Double_t c =OneOverPt(); | |
15dd636f | 145 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2(); |
146 | Double_t c =GetSigmaY2()*GetSigmaZ2(); | |
006b5f7f | 147 | if (c>co) return 1; |
148 | else if (c<co) return -1; | |
149 | return 0; | |
150 | } | |
151 | ||
006b5f7f | 152 | //____________________________________________________________________________ |
6c94f330 | 153 | Bool_t |
154 | AliITStrackV2::PropagateToVertex(const AliESDVertex *v,Double_t d,Double_t x0) | |
155 | { | |
006b5f7f | 156 | //------------------------------------------------------------------ |
157 | //This function propagates a track to the minimal distance from the origin | |
6c94f330 | 158 | //------------------------------------------------------------------ |
159 | Double_t bz=GetBz(); | |
e50912db | 160 | if (PropagateToDCA(v,bz,kVeryBig)) { |
161 | Double_t xOverX0,xTimesRho; | |
162 | xOverX0 = d; xTimesRho = d*x0; | |
163 | if (CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kTRUE; | |
164 | } | |
6c94f330 | 165 | return kFALSE; |
006b5f7f | 166 | } |
167 | ||
168 | //____________________________________________________________________________ | |
6c94f330 | 169 | Bool_t AliITStrackV2:: |
e50912db | 170 | GetGlobalXYZat(Double_t xloc, Double_t &x, Double_t &y, Double_t &z) const { |
006b5f7f | 171 | //------------------------------------------------------------------ |
172 | //This function returns a track position in the global system | |
173 | //------------------------------------------------------------------ | |
6c94f330 | 174 | Double_t r[3]; |
f7a1cc68 | 175 | Bool_t rc=GetXYZAt(xloc, GetBz(), r); |
6c94f330 | 176 | x=r[0]; y=r[1]; z=r[2]; |
177 | return rc; | |
006b5f7f | 178 | } |
179 | ||
180 | //_____________________________________________________________________________ | |
6c94f330 | 181 | Double_t AliITStrackV2::GetPredictedChi2(const AliCluster *c) const { |
006b5f7f | 182 | //----------------------------------------------------------------- |
183 | // This function calculates a predicted chi2 increment. | |
184 | //----------------------------------------------------------------- | |
6c94f330 | 185 | Double_t p[2]={c->GetY(), c->GetZ()}; |
186 | Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()}; | |
187 | return AliExternalTrackParam::GetPredictedChi2(p,cov); | |
a9a2d814 | 188 | } |
189 | ||
190 | //____________________________________________________________________________ | |
6c94f330 | 191 | Bool_t AliITStrackV2::PropagateTo(Double_t xk, Double_t d, Double_t x0) { |
006b5f7f | 192 | //------------------------------------------------------------------ |
193 | //This function propagates a track | |
194 | //------------------------------------------------------------------ | |
afd25725 | 195 | |
6c94f330 | 196 | Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ(); |
006b5f7f | 197 | |
1defa402 | 198 | //Double_t bz=GetBz(); |
199 | //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE; | |
200 | Double_t b[3]; GetBxByBz(b); | |
201 | if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE; | |
e50912db | 202 | Double_t xOverX0,xTimesRho; |
203 | xOverX0 = d; xTimesRho = d*x0; | |
204 | if (!CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kFALSE; | |
006b5f7f | 205 | |
dd44614b | 206 | Double_t x=GetX(), y=GetY(), z=GetZ(); |
6c94f330 | 207 | if (IsStartedTimeIntegral() && x>oldX) { |
208 | Double_t l2 = (x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ); | |
f29dbb4b | 209 | AddTimeStep(TMath::Sqrt(l2)); |
210 | } | |
f29dbb4b | 211 | |
6c94f330 | 212 | return kTRUE; |
006b5f7f | 213 | } |
214 | ||
afd25725 | 215 | //____________________________________________________________________________ |
db355ee7 | 216 | Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho, Bool_t addTime) { |
afd25725 | 217 | //------------------------------------------------------------------- |
218 | // Propagates the track to a reference plane x=xToGo in n steps. | |
219 | // These n steps are only used to take into account the curvature. | |
220 | // The material is calculated with TGeo. (L.Gaudichet) | |
221 | //------------------------------------------------------------------- | |
222 | ||
223 | Double_t startx = GetX(), starty = GetY(), startz = GetZ(); | |
224 | Double_t sign = (startx<xToGo) ? -1.:1.; | |
225 | Double_t step = (xToGo-startx)/TMath::Abs(nstep); | |
226 | ||
1defa402 | 227 | Double_t start[3], end[3], mparam[7]; |
228 | //Double_t bz = GetBz(); | |
229 | Double_t b[3]; GetBxByBz(b); | |
230 | Double_t bz = b[2]; | |
231 | ||
afd25725 | 232 | Double_t x = startx; |
233 | ||
234 | for (Int_t i=0; i<nstep; i++) { | |
235 | ||
236 | GetXYZ(start); //starting global position | |
237 | x += step; | |
238 | if (!GetXYZAt(x, bz, end)) return kFALSE; | |
1defa402 | 239 | //if (!AliExternalTrackParam::PropagateTo(x, bz)) return kFALSE; |
240 | if (!AliExternalTrackParam::PropagateToBxByBz(x, b)) return kFALSE; | |
afd25725 | 241 | AliTracker::MeanMaterialBudget(start, end, mparam); |
8fc9f3dc | 242 | xTimesRho = sign*mparam[4]*mparam[0]; |
243 | xOverX0 = mparam[1]; | |
afd25725 | 244 | if (mparam[1]<900000) { |
afd25725 | 245 | if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0, |
8fc9f3dc | 246 | xTimesRho,GetMass())) return kFALSE; |
247 | } else { // this happens when MeanMaterialBudget cannot cross a boundary | |
248 | return kFALSE; | |
afd25725 | 249 | } |
250 | } | |
251 | ||
db355ee7 | 252 | if (addTime && IsStartedTimeIntegral() && GetX()>startx) { |
afd25725 | 253 | Double_t l2 = ( (GetX()-startx)*(GetX()-startx) + |
254 | (GetY()-starty)*(GetY()-starty) + | |
255 | (GetZ()-startz)*(GetZ()-startz) ); | |
256 | AddTimeStep(TMath::Sqrt(l2)); | |
257 | } | |
258 | ||
259 | return kTRUE; | |
260 | } | |
261 | ||
006b5f7f | 262 | //____________________________________________________________________________ |
6c94f330 | 263 | Bool_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, Int_t index) |
264 | { | |
006b5f7f | 265 | //------------------------------------------------------------------ |
266 | //This function updates track parameters | |
267 | //------------------------------------------------------------------ | |
6c94f330 | 268 | Double_t p[2]={c->GetY(), c->GetZ()}; |
d9ead1a0 | 269 | Double_t cov[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()}; |
006b5f7f | 270 | |
6c94f330 | 271 | if (!AliExternalTrackParam::Update(p,cov)) return kFALSE; |
006b5f7f | 272 | |
28d5b13d | 273 | Int_t n=GetNumberOfClusters(); |
006b5f7f | 274 | if (!Invariant()) { |
28d5b13d | 275 | if (n>fgkWARN) AliWarning("Wrong invariant !"); |
6c94f330 | 276 | return kFALSE; |
006b5f7f | 277 | } |
278 | ||
6c94f330 | 279 | if (chi2<0) return kTRUE; |
67c3dcbe | 280 | |
b5205c90 | 281 | // fill residuals for ITS+TPC tracks |
badb951a | 282 | if (fESDtrack) { |
283 | if (fESDtrack->GetStatus()&AliESDtrack::kTPCin) { | |
284 | AliTracker::FillResiduals(this,p,cov,c->GetVolumeId()); | |
285 | } | |
b5205c90 | 286 | } |
150f264c | 287 | |
006b5f7f | 288 | fIndex[n]=index; |
289 | SetNumberOfClusters(n+1); | |
290 | SetChi2(GetChi2()+chi2); | |
291 | ||
6c94f330 | 292 | return kTRUE; |
006b5f7f | 293 | } |
294 | ||
6c94f330 | 295 | Bool_t AliITStrackV2::Invariant() const { |
006b5f7f | 296 | //------------------------------------------------------------------ |
297 | // This function is for debugging purpose only | |
298 | //------------------------------------------------------------------ | |
545af9ef | 299 | if(!fCheckInvariant) return kTRUE; |
300 | ||
7f6ddf58 | 301 | Int_t n=GetNumberOfClusters(); |
6c94f330 | 302 | |
8a84886c | 303 | // take into account the misalignment error |
304 | Float_t maxMisalErrY2=0,maxMisalErrZ2=0; | |
305 | for (Int_t lay=0; lay<AliITSgeomTGeo::kNLayers; lay++) { | |
d9ead1a0 | 306 | maxMisalErrY2 = TMath::Max(maxMisalErrY2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(lay,GetBz())); |
307 | maxMisalErrZ2 = TMath::Max(maxMisalErrZ2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(lay,GetBz())); | |
8a84886c | 308 | } |
309 | maxMisalErrY2 *= maxMisalErrY2; | |
310 | maxMisalErrZ2 *= maxMisalErrZ2; | |
311 | // this is because when we reset before refitting, we multiply the | |
312 | // matrix by 10 | |
313 | maxMisalErrY2 *= 10.; | |
314 | maxMisalErrZ2 *= 10.; | |
315 | ||
6c94f330 | 316 | Double_t sP2=GetParameter()[2]; |
317 | if (TMath::Abs(sP2) >= kAlmost1){ | |
8602c008 | 318 | if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2); |
6c94f330 | 319 | return kFALSE; |
a9a2d814 | 320 | } |
6c94f330 | 321 | Double_t sC00=GetCovariance()[0]; |
8a84886c | 322 | if (sC00<=0 || sC00>(9.+maxMisalErrY2)) { |
8602c008 | 323 | if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00); |
6c94f330 | 324 | return kFALSE; |
a9a2d814 | 325 | } |
6c94f330 | 326 | Double_t sC11=GetCovariance()[2]; |
8a84886c | 327 | if (sC11<=0 || sC11>(9.+maxMisalErrZ2)) { |
8602c008 | 328 | if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11); |
6c94f330 | 329 | return kFALSE; |
a9a2d814 | 330 | } |
6c94f330 | 331 | Double_t sC22=GetCovariance()[5]; |
332 | if (sC22<=0 || sC22>1.) { | |
8602c008 | 333 | if (n>fgkWARN) Warning("Invariant","fC22=%f\n",sC22); |
6c94f330 | 334 | return kFALSE; |
a9a2d814 | 335 | } |
6c94f330 | 336 | Double_t sC33=GetCovariance()[9]; |
337 | if (sC33<=0 || sC33>1.) { | |
8602c008 | 338 | if (n>fgkWARN) Warning("Invariant","fC33=%f\n",sC33); |
6c94f330 | 339 | return kFALSE; |
a9a2d814 | 340 | } |
6c94f330 | 341 | Double_t sC44=GetCovariance()[14]; |
342 | if (sC44<=0 /*|| sC44>6e-5*/) { | |
8602c008 | 343 | if (n>fgkWARN) Warning("Invariant","fC44=%f\n",sC44); |
6c94f330 | 344 | return kFALSE; |
14825d5a | 345 | } |
6c94f330 | 346 | |
347 | return kTRUE; | |
006b5f7f | 348 | } |
349 | ||
350 | //____________________________________________________________________________ | |
6c94f330 | 351 | Bool_t AliITStrackV2::Propagate(Double_t alp,Double_t xk) { |
006b5f7f | 352 | //------------------------------------------------------------------ |
353 | //This function propagates a track | |
354 | //------------------------------------------------------------------ | |
1defa402 | 355 | //Double_t bz=GetBz(); |
356 | //if (!AliExternalTrackParam::Propagate(alp,xk,bz)) return kFALSE; | |
357 | Double_t b[3]; GetBxByBz(b); | |
358 | if (!AliExternalTrackParam::PropagateBxByBz(alp,xk,b)) return kFALSE; | |
006b5f7f | 359 | |
006b5f7f | 360 | if (!Invariant()) { |
8a84886c | 361 | Int_t n=GetNumberOfClusters(); |
362 | if (n>fgkWARN) AliWarning("Wrong invariant !"); | |
363 | return kFALSE; | |
791f9a2a | 364 | } |
365 | ||
6c94f330 | 366 | return kTRUE; |
a9a2d814 | 367 | } |
006b5f7f | 368 | |
afd25725 | 369 | Bool_t AliITStrackV2::MeanBudgetToPrimVertex(Double_t xyz[3], Double_t step, Double_t &d) const { |
370 | ||
371 | //------------------------------------------------------------------- | |
372 | // Get the mean material budget between the actual point and the | |
373 | // primary vertex. (L.Gaudichet) | |
374 | //------------------------------------------------------------------- | |
375 | ||
376 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); | |
377 | Double_t vertexX = xyz[0]*cs + xyz[1]*sn; | |
378 | ||
379 | Int_t nstep = Int_t((GetX()-vertexX)/step); | |
380 | if (nstep<1) nstep = 1; | |
381 | step = (GetX()-vertexX)/nstep; | |
382 | ||
c7719399 | 383 | // Double_t mparam[7], densMean=0, radLength=0, length=0; |
384 | Double_t mparam[7]; | |
afd25725 | 385 | Double_t p1[3], p2[3], x = GetX(), bz = GetBz(); |
386 | GetXYZ(p1); | |
387 | ||
388 | d=0.; | |
389 | ||
390 | for (Int_t i=0; i<nstep; i++) { | |
391 | x += step; | |
392 | if (!GetXYZAt(x, bz, p2)) return kFALSE; | |
393 | AliTracker::MeanMaterialBudget(p1, p2, mparam); | |
394 | if (mparam[1]>900000) return kFALSE; | |
395 | d += mparam[1]; | |
396 | ||
397 | p1[0] = p2[0]; | |
398 | p1[1] = p2[1]; | |
399 | p1[2] = p2[2]; | |
400 | } | |
401 | ||
402 | return kTRUE; | |
403 | } | |
404 | ||
6c94f330 | 405 | Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) { |
babd135a | 406 | //------------------------------------------------------------------ |
6c94f330 | 407 | //This function improves angular track parameters |
babd135a | 408 | //------------------------------------------------------------------ |
86be8934 | 409 | //Store the initail track parameters |
410 | ||
86be8934 | 411 | Double_t x = GetX(); |
412 | Double_t alpha = GetAlpha(); | |
413 | Double_t par[] = {GetY(),GetZ(),GetSnp(),GetTgl(),GetSigned1Pt()}; | |
414 | Double_t cov[] = { | |
415 | GetSigmaY2(), | |
416 | GetSigmaZY(), | |
417 | GetSigmaZ2(), | |
418 | GetSigmaSnpY(), | |
419 | GetSigmaSnpZ(), | |
420 | GetSigmaSnp2(), | |
421 | GetSigmaTglY(), | |
422 | GetSigmaTglZ(), | |
423 | GetSigmaTglSnp(), | |
424 | GetSigmaTgl2(), | |
425 | GetSigma1PtY(), | |
426 | GetSigma1PtZ(), | |
427 | GetSigma1PtSnp(), | |
428 | GetSigma1PtTgl(), | |
429 | GetSigma1Pt2() | |
430 | }; | |
431 | ||
432 | ||
6c94f330 | 433 | Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha()); |
cb4706fe | 434 | Double_t xv = xyz[0]*cs + xyz[1]*sn; // vertex |
6c94f330 | 435 | Double_t yv =-xyz[0]*sn + xyz[1]*cs; // in the |
436 | Double_t zv = xyz[2]; // local frame | |
babd135a | 437 | |
cb4706fe | 438 | Double_t dx = x - xv, dy = par[0] - yv, dz = par[1] - zv; |
439 | Double_t r2=dx*dx + dy*dy; | |
6c23ffed | 440 | Double_t p2=(1.+ GetTgl()*GetTgl())/(GetSigned1Pt()*GetSigned1Pt()); |
a9a2d814 | 441 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
442 | x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp())); | |
8676d691 | 443 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0; |
444 | //Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*x0*9.36*2.33; | |
6c94f330 | 445 | |
63126a46 | 446 | Double_t bz=GetBz(); |
447 | Double_t cnv=bz*kB2C; | |
448 | Double_t curv=GetC(bz); | |
a9a2d814 | 449 | { |
63126a46 | 450 | Double_t dummy = 4/r2 - curv*curv; |
6c94f330 | 451 | if (dummy < 0) return kFALSE; |
63126a46 | 452 | Double_t parp = 0.5*(curv*dx + dy*TMath::Sqrt(dummy)); |
bfd20868 | 453 | Double_t sigma2p = theta2*(1.-GetSnp())*(1.+GetSnp())*(1. + GetTgl()*GetTgl()); |
454 | Double_t ovSqr2 = 1./TMath::Sqrt(r2); | |
455 | Double_t tfact = ovSqr2*(1.-dy*ovSqr2)*(1.+dy*ovSqr2); | |
86be8934 | 456 | sigma2p += cov[0]*tfact*tfact; |
6c94f330 | 457 | sigma2p += ers[1]*ers[1]/r2; |
cb4706fe | 458 | sigma2p += 0.25*cov[14]*cnv*cnv*dx*dx; |
86be8934 | 459 | Double_t eps2p=sigma2p/(cov[5] + sigma2p); |
460 | par[0] += cov[3]/(cov[5] + sigma2p)*(parp - GetSnp()); | |
461 | par[2] = eps2p*GetSnp() + (1 - eps2p)*parp; | |
462 | cov[5] *= eps2p; | |
463 | cov[3] *= eps2p; | |
a9a2d814 | 464 | } |
465 | { | |
63126a46 | 466 | Double_t parl=0.5*curv*dz/TMath::ASin(0.5*curv*TMath::Sqrt(r2)); |
6c94f330 | 467 | Double_t sigma2l=theta2; |
86be8934 | 468 | sigma2l += cov[2]/r2 + cov[0]*dy*dy*dz*dz/(r2*r2*r2); |
6c94f330 | 469 | sigma2l += ers[2]*ers[2]/r2; |
86be8934 | 470 | Double_t eps2l = sigma2l/(cov[9] + sigma2l); |
471 | par[1] += cov[7 ]/(cov[9] + sigma2l)*(parl - par[3]); | |
472 | par[4] += cov[13]/(cov[9] + sigma2l)*(parl - par[3]); | |
473 | par[3] = eps2l*par[3] + (1-eps2l)*parl; | |
474 | cov[9] *= eps2l; | |
475 | cov[13]*= eps2l; | |
476 | cov[7] *= eps2l; | |
a9a2d814 | 477 | } |
86be8934 | 478 | |
479 | Set(x,alpha,par,cov); | |
480 | ||
6c94f330 | 481 | if (!Invariant()) return kFALSE; |
14825d5a | 482 | |
6c94f330 | 483 | return kTRUE; |
14825d5a | 484 | } |
23efe5f1 | 485 | |
486 | void AliITStrackV2::CookdEdx(Double_t low, Double_t up) { | |
487 | //----------------------------------------------------------------- | |
a9a2d814 | 488 | // This function calculates dE/dX within the "low" and "up" cuts. |
489 | // Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
09cf9d66 | 490 | // Updated: F. Prino 8-June-2009 |
23efe5f1 | 491 | //----------------------------------------------------------------- |
09cf9d66 | 492 | // The cluster order is: SDD-1, SDD-2, SSD-1, SSD-2 |
c0dd5278 | 493 | |
c0dd5278 | 494 | Int_t nc=0; |
09cf9d66 | 495 | Float_t dedx[4]; |
496 | for (Int_t il=0; il<4; il++) { // count good (>0) dE/dx values | |
497 | if(fdEdxSample[il]>0.){ | |
498 | dedx[nc]= fdEdxSample[il]; | |
499 | nc++; | |
500 | } | |
501 | } | |
502 | if(nc<1){ | |
503 | SetdEdx(0.); | |
504 | return; | |
c0dd5278 | 505 | } |
23efe5f1 | 506 | |
09cf9d66 | 507 | Int_t swap; // sort in ascending order |
23efe5f1 | 508 | do { |
509 | swap=0; | |
09cf9d66 | 510 | for (Int_t i=0; i<nc-1; i++) { |
511 | if (dedx[i]<=dedx[i+1]) continue; | |
512 | Float_t tmp=dedx[i]; | |
513 | dedx[i]=dedx[i+1]; | |
514 | dedx[i+1]=tmp; | |
23efe5f1 | 515 | swap++; |
516 | } | |
517 | } while (swap); | |
518 | ||
23efe5f1 | 519 | |
09cf9d66 | 520 | Double_t nl=low*nc, nu =up*nc; |
521 | Float_t sumamp = 0; | |
522 | Float_t sumweight =0; | |
523 | for (Int_t i=0; i<nc; i++) { | |
524 | Float_t weight =1; | |
525 | if (i<nl+0.1) weight = TMath::Max(1.-(nl-i),0.); | |
526 | if (i>nu-1) weight = TMath::Max(nu-i,0.); | |
527 | sumamp+= dedx[i]*weight; | |
528 | sumweight+=weight; | |
529 | } | |
530 | SetdEdx(sumamp/sumweight); | |
23efe5f1 | 531 | } |
c7bafca9 | 532 | |
8602c008 | 533 | //____________________________________________________________________________ |
534 | Bool_t AliITStrackV2:: | |
e50912db | 535 | GetPhiZat(Double_t r, Double_t &phi, Double_t &z) const { |
536 | //------------------------------------------------------------------ | |
537 | // This function returns the global cylindrical (phi,z) of the track | |
538 | // position estimated at the radius r. | |
539 | // The track curvature is neglected. | |
540 | //------------------------------------------------------------------ | |
541 | Double_t d=GetD(0.,0.); | |
bc02d571 | 542 | if (TMath::Abs(d) > r) { |
543 | if (r>1e-1) return kFALSE; | |
544 | r = TMath::Abs(d); | |
545 | } | |
e50912db | 546 | |
547 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); | |
494a930c | 548 | if (TMath::Abs(d) > rcurr) return kFALSE; |
549 | Double_t globXYZcurr[3]; GetXYZ(globXYZcurr); | |
550 | Double_t phicurr=TMath::ATan2(globXYZcurr[1],globXYZcurr[0]); | |
e50912db | 551 | |
2089d338 | 552 | if (GetX()>=0.) { |
553 | phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
554 | } else { | |
555 | phi=phicurr+TMath::ASin(d/r)+TMath::ASin(d/rcurr)-TMath::Pi(); | |
556 | } | |
557 | ||
494a930c | 558 | // return a phi in [0,2pi[ |
559 | if (phi<0.) phi+=2.*TMath::Pi(); | |
560 | else if (phi>=2.*TMath::Pi()) phi-=2.*TMath::Pi(); | |
c7de5c65 | 561 | z=GetZ()+GetTgl()*(TMath::Sqrt((r-d)*(r+d))-TMath::Sqrt((rcurr-d)*(rcurr+d))); |
e50912db | 562 | return kTRUE; |
563 | } | |
564 | //____________________________________________________________________________ | |
565 | Bool_t AliITStrackV2:: | |
566 | GetLocalXat(Double_t r,Double_t &xloc) const { | |
8602c008 | 567 | //------------------------------------------------------------------ |
e50912db | 568 | // This function returns the local x of the track |
569 | // position estimated at the radius r. | |
8602c008 | 570 | // The track curvature is neglected. |
571 | //------------------------------------------------------------------ | |
572 | Double_t d=GetD(0.,0.); | |
6a14afad | 573 | if (TMath::Abs(d) > r) { |
574 | if (r>1e-1) return kFALSE; | |
575 | r = TMath::Abs(d); | |
576 | } | |
8602c008 | 577 | |
e50912db | 578 | Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY()); |
494a930c | 579 | Double_t globXYZcurr[3]; GetXYZ(globXYZcurr); |
580 | Double_t phicurr=TMath::ATan2(globXYZcurr[1],globXYZcurr[0]); | |
2089d338 | 581 | Double_t phi; |
582 | if (GetX()>=0.) { | |
583 | phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr); | |
584 | } else { | |
585 | phi=phicurr+TMath::ASin(d/r)+TMath::ASin(d/rcurr)-TMath::Pi(); | |
586 | } | |
8602c008 | 587 | |
e50912db | 588 | xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha()) |
589 | +TMath::Sin(phi)*TMath::Sin(GetAlpha())); | |
8602c008 | 590 | |
591 | return kTRUE; | |
592 | } | |
63126a46 | 593 |