1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 //-----------------------------------------------------------------
19 // Implementation of the TPC track class
20 // This class is used by the AliTPCtracker class
21 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
22 //-----------------------------------------------------------------
24 #include <Riostream.h>
26 #include "AliTPCtrack.h"
27 #include "AliCluster.h"
28 #include "AliTracker.h"
29 #include "AliESDtrack.h"
30 #include "AliESDVertex.h"
31 #include "TTreeStream.h"
35 //_________________________________________________________________________
36 AliTPCtrack::AliTPCtrack():
50 //-------------------------------------------------
51 // default constructor
52 //-------------------------------------------------
53 for (Int_t i=0; i<kMaxRow;i++) fIndex[i]=-2;
54 for (Int_t i=0; i<4;i++) fPoints[i]=0.;
55 for (Int_t i=0; i<12;i++) fKinkPoint[i]=0.;
56 for (Int_t i=0; i<3;i++) fKinkIndexes[i]=0;
57 for (Int_t i=0; i<3;i++) fV0Indexes[i]=0;
60 //_________________________________________________________________________
64 AliTPCtrack::AliTPCtrack(Double_t x, Double_t alpha, const Double_t p[5],
65 const Double_t cov[15], Int_t index) :
79 //-----------------------------------------------------------------
80 // This is the main track constructor.
81 //-----------------------------------------------------------------
82 Double_t cnv=1./(AliTracker::GetBz()*kB2C);
92 Double_t c22 = x*x*cov[14] - 2*x*cov[12] + cov[5];
93 Double_t c32 = x*cov[13] - cov[8];
94 Double_t c20 = x*cov[10] - cov[3],
95 c21 = x*cov[11] - cov[4], c42 = x*cov[14] - cov[12];
101 cov[6 ], cov[7 ], c32, cov[9 ],
102 cov[10]*cnv, cov[11]*cnv, c42*cnv, cov[13]*cnv, cov[14]*cnv*cnv
105 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
106 Double_t p0=TMath::Sign(1/mostProbablePt,pp[4]);
107 Double_t w0=cc[14]/(cc[14] + p0*p0), w1=p0*p0/(cc[14] + p0*p0);
108 pp[4] = w0*p0 + w1*pp[4];
109 cc[10]*=w1; cc[11]*=w1; cc[12]*=w1; cc[13]*=w1; cc[14]*=w1;
113 SetNumberOfClusters(1);
116 for (Int_t i=1; i<kMaxRow;i++) fIndex[i]=-2;
117 for (Int_t i=0; i<4;i++) fPoints[i]=0.;
118 for (Int_t i=0; i<12;i++) fKinkPoint[i]=0.;
119 for (Int_t i=0; i<3;i++) fKinkIndexes[i]=0;
120 for (Int_t i=0; i<3;i++) fV0Indexes[i]=0;
123 //_____________________________________________________________________________
124 AliTPCtrack::AliTPCtrack(const AliESDtrack& t, TTreeSRedirector *pcstream) :
126 fdEdx(t.GetTPCsignal()),
138 //-----------------------------------------------------------------
139 // Conversion AliESDtrack -> AliTPCtrack.
140 //-----------------------------------------------------------------
141 const Double_t kmaxC[4]={10,10,0.1,0.1}; // cuts on the rms /fP0,fP1,fP2,fP3
142 SetNumberOfClusters(t.GetTPCclusters(fIndex));
143 SetLabel(t.GetLabel());
144 SetMass(t.GetMass());
145 for (Int_t i=0; i<4;i++) fPoints[i]=0.;
146 for (Int_t i=0; i<12;i++) fKinkPoint[i]=0.;
147 for (Int_t i=0; i<3;i++) fKinkIndexes[i]=0;
148 for (Int_t i=0; i<3;i++) fV0Indexes[i]=0;
150 // choose parameters to start
153 AliExternalTrackParam param(t);
154 const AliExternalTrackParam *tpcout=(t.GetFriendTrack())? ((AliESDfriendTrack*)(t.GetFriendTrack()))->GetTPCOut():0;
155 const AliExternalTrackParam *tpcin = t.GetInnerParam();
156 const AliExternalTrackParam *tpc=(tpcout)?tpcout:tpcin;
157 if (!tpc) tpc=¶m;
159 if (param.GetCovariance()[0]>kmaxC[0]*kmaxC[0]) isOK=kFALSE;
160 if (param.GetCovariance()[2]>kmaxC[1]*kmaxC[1]) isOK=kFALSE;
161 if (param.GetCovariance()[5]>kmaxC[2]*kmaxC[2]) isOK=kFALSE;
162 if (param.GetCovariance()[9]>kmaxC[3]*kmaxC[3]) isOK=kFALSE;
168 param.Rotate(tpc->GetAlpha());
169 isOK=AliTracker::PropagateTrackToBxByBz(¶m,tpc->GetX(),t.GetMass(),2.,kFALSE);
170 if (param.GetCovariance()[0]>kmaxC[0]*kmaxC[0]) isOK=kFALSE;
171 if (param.GetCovariance()[2]>kmaxC[1]*kmaxC[1]) isOK=kFALSE;
172 if (param.GetCovariance()[5]>kmaxC[2]*kmaxC[2]) isOK=kFALSE;
173 if (param.GetCovariance()[9]>kmaxC[3]*kmaxC[3]) isOK=kFALSE;
180 param.ResetCovariance(4.); // reset covariance if start from backup param
185 AliExternalTrackParam dummy;
186 AliExternalTrackParam *ptpc=(AliExternalTrackParam *)tpc;
187 if (!ptpc) ptpc=&dummy;
188 AliESDtrack *esd= (AliESDtrack *)&t;
189 (*pcstream)<<"trackP"<<
190 "reject="<<reject<< // flag - rejection of current esd track parameters
191 "esd.="<<esd<< // original esd track
192 "tr.="<<¶m<< // starting track parameters
193 "out.="<<ptpc<< // backup tpc parameters
197 Set(param.GetX(),param.GetAlpha(),param.GetParameter(),param.GetCovariance());
199 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
201 Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
202 SetIntegratedLength(t.GetIntegratedLength());
205 //_____________________________________________________________________________
206 AliTPCtrack::AliTPCtrack(const AliTPCtrack& t) :
210 fNFoundable(t.fNFoundable),
211 fBConstrain(t.fBConstrain),
212 fLastPoint(t.fLastPoint),
213 fFirstPoint(t.fFirstPoint),
214 fRemoval(t.fRemoval),
215 fTrackType(t.fTrackType),
217 fNShared(t.fNShared),
218 fReference(t.fReference)
221 //-----------------------------------------------------------------
222 // This is a track copy constructor.
223 //-----------------------------------------------------------------
224 Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
226 for (Int_t i=0; i<kMaxRow; i++) fIndex[i]=t.fIndex[i];
227 for (Int_t i=0; i<4;i++) fPoints[i]=t.fPoints[i];
228 for (Int_t i=0; i<12;i++) fKinkPoint[i]=t.fKinkPoint[i];
229 for (Int_t i=0; i<3;i++) fKinkIndexes[i]=t.fKinkIndexes[i];
230 for (Int_t i=0; i<3;i++) fV0Indexes[i]=t.fV0Indexes[i];
233 AliTPCtrack& AliTPCtrack::operator=(const AliTPCtrack& o){
235 AliKalmanTrack::operator=(o);
237 for(Int_t i = 0;i<kMaxRow;++i)fIndex[i] = o.fIndex[i];
238 for(Int_t i = 0;i<4;++i)fPoints[i] = o.fPoints[i];
240 fNFoundable = o.fNFoundable;
241 fBConstrain = o.fBConstrain;
242 fLastPoint = o.fLastPoint;
243 fFirstPoint = o.fFirstPoint;
244 fTrackType = o.fTrackType;
246 fNShared = o.fNShared;
247 fReference = o.fReference;
248 for(Int_t i = 0;i<12;++i) fKinkPoint[i] = o.fKinkPoint[i];
250 for(Int_t i = 0;i<3;++i){
251 fKinkIndexes[i] = o.fKinkIndexes[i];
252 fV0Indexes[i] = o.fV0Indexes[i];
260 //_____________________________________________________________________________
261 Int_t AliTPCtrack::Compare(const TObject *o) const {
262 //-----------------------------------------------------------------
263 // This function compares tracks according to the their curvature
264 //-----------------------------------------------------------------
265 AliTPCtrack *t=(AliTPCtrack*)o;
266 //Double_t co=t->OneOverPt();
267 //Double_t c = OneOverPt();
268 Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
269 Double_t c =GetSigmaY2()*GetSigmaZ2();
271 else if (c<co) return -1;
275 Double_t AliTPCtrack::GetPredictedChi2(const AliCluster *c) const {
276 //-----------------------------------------------------------------
277 // This function calculates a predicted chi2 increment.
278 //-----------------------------------------------------------------
279 Double_t p[2]={c->GetY(), c->GetZ()};
280 Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()};
281 return AliExternalTrackParam::GetPredictedChi2(p,cov);
284 //_____________________________________________________________________________
285 Bool_t AliTPCtrack::PropagateTo(Double_t xk,Double_t rho,Double_t x0) {
286 //-----------------------------------------------------------------
287 // This function propagates a track to a reference plane x=xk.
288 // rho - density of the crossed matrial (g/cm^3)
289 // x0 - radiation length of the crossed material (g/cm^2)
290 //-----------------------------------------------------------------
294 if (!GetZAt(xk, bz,zat)) return kFALSE;
295 if (TMath::Abs(zat)>250.){
296 // Don't propagate track outside of the fiducial volume - material budget not proper one
298 //AliWarning("Propagate outside of fiducial volume");
302 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
303 //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
304 Double_t b[3]; GetBxByBz(b);
305 if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
307 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
308 (GetY()-oldY)*(GetY()-oldY) +
309 (GetZ()-oldZ)*(GetZ()-oldZ));
310 if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
312 if (oldX < xk) d = -d;
313 if (!AliExternalTrackParam::CorrectForMeanMaterial(d*rho/x0,d*rho,GetMass(),
314 kFALSE,AliExternalTrackParam::BetheBlochGas)) return kFALSE;
319 //_____________________________________________________________________________
321 AliTPCtrack::PropagateToVertex(const AliESDVertex *v,Double_t rho,Double_t x0)
323 //-----------------------------------------------------------------
324 // This function propagates tracks to the vertex
325 // rho - density of the crossed matrial (g/cm3)
326 // x0 - radiation length of the crossed material (g/cm2)
327 //-----------------------------------------------------------------
328 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
330 //Double_t bz=GetBz();
331 //if (!PropagateToDCA(v,bz,kVeryBig)) return kFALSE;
332 Double_t b[3]; GetBxByBz(b);
333 if (!PropagateToDCABxByBz(v,b,kVeryBig)) return kFALSE;
335 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
336 (GetY()-oldY)*(GetY()-oldY) +
337 (GetZ()-oldZ)*(GetZ()-oldZ));
339 if (oldX < GetX()) d = -d;
340 if (!AliExternalTrackParam::CorrectForMeanMaterial(d*rho/x0,d*rho,GetMass(),
341 kFALSE,AliExternalTrackParam::BetheBlochGas)) return kFALSE;
346 //_____________________________________________________________________________
347 Bool_t AliTPCtrack::Update(const AliCluster *c, Double_t chisq, Int_t index) {
348 //-----------------------------------------------------------------
349 // This function associates a cluster with this track.
350 //-----------------------------------------------------------------
351 Double_t p[2]={c->GetY(), c->GetZ()};
352 Double_t cov[3]={c->GetSigmaY2(), 0., c->GetSigmaZ2()};
354 if (!AliExternalTrackParam::Update(p,cov)) return kFALSE;
356 AliTracker::FillResiduals(this,p,cov,c->GetVolumeId());
358 Int_t n=GetNumberOfClusters();
360 SetNumberOfClusters(n+1);
361 SetChi2(GetChi2()+chisq);
366 ////////////////////////////////////////////////////////////////////////
369 Float_t AliTPCtrack::Density(Int_t row0, Int_t row1)
372 // calculate cluster density
375 //if (row0<fFirstPoint) row0 = fFirstPoint;
376 if (row1>fLastPoint) row1 = fLastPoint;
379 for (Int_t i=row0;i<=row1;i++){
380 // Int_t index = fClusterIndex[i];
381 Int_t index = fIndex[i];
382 if (index!=-1) good++;
383 if (index>0) found++;
386 if (good>0) density = Float_t(found)/Float_t(good);
391 Float_t AliTPCtrack::Density2(Int_t row0, Int_t row1)
394 // calculate cluster density
398 for (Int_t i=row0;i<=row1;i++){
399 Int_t index = fIndex[i];
400 if (index!=-1) good++;
401 if (index>0) found++;
404 if (good>0) density = Float_t(found)/Float_t(good);
408 void AliTPCtrack::UpdatePoints()
410 //--------------------------------------------------
411 //calculates first ,amx dens and last points
412 //--------------------------------------------------
413 Float_t density[160];
414 for (Int_t i=0;i<160;i++) density[i]=-1.;
422 for (Int_t i=0;i<160;i++){
423 Int_t last = i-range;
424 if (nall<range) nall++;
426 if (fIndex[last]>0&& (fIndex[last]&0x8000)==0) ngood--;
427 if (fIndex[last]==-1) undeff--;
429 if (fIndex[i]>0&& (fIndex[i]&0x8000)==0) ngood++;
430 if (fIndex[i]==-1) undeff++;
431 if (nall==range &&undeff<range/2) density[i-range/2] = Float_t(ngood)/Float_t(nall-undeff);
435 for (Int_t i=0;i<160;i++){
436 if (density[i]<0) continue;
437 if (density[i]>maxdens){
444 fPoints[3] = maxdens;
445 fPoints[1] = indexmax;
448 for (Int_t i=indexmax;i<160;i++){
449 if (density[i]<0) continue;
450 if (density[i]<maxdens/2.) {
457 for (Int_t i=indexmax;i>0;i--){
458 if (density[i]<0) continue;
459 if (density[i]<maxdens/2.) {