// This is the class to deal with during the phisics analysis of data
// Origin: Iouri Belikov, CERN
// e-mail: Jouri.Belikov@cern.ch
+//
+//
+//
+// What do you need to know before starting analysis
+// (by Marian Ivanov: marian.ivanov@cern.ch)
+//
+//
+// AliESDtrack:
+// 1. What is the AliESDtrack
+// 2. What informations do we store
+// 3. How to use the information for analysis
+//
+//
+// 1.AliESDtrack is the container of the information about the track/particle
+// reconstructed during Barrel Tracking.
+// The track information is propagated from one tracking detector to
+// other using the functionality of AliESDtrack - Current parameters.
+//
+// No global fit model is used.
+// Barrel tracking use Kalman filtering technique, it gives optimal local
+// track parameters at given point under certian assumptions.
+//
+// Kalman filter take into account additional effect which are
+// difficult to handle using global fit.
+// Effects:
+// a.) Multiple scattering
+// b.) Energy loss
+// c.) Non homogenous magnetic field
+//
+// In general case, following barrel detectors are contributing to
+// the Kalman track information:
+// a. TPC
+// b. ITS
+// c. TRD
+//
+// In general 3 reconstruction itteration are performed:
+// 1. Find tracks - sequence TPC->ITS
+// 2. PropagateBack - sequence ITS->TPC->TRD -> Outer PID detectors
+// 3. Refit invward - sequence TRD->TPC->ITS
+// The current tracks are updated after each detector (see bellow).
+// In specical cases a track sanpshots are stored.
+//
+//
+// For some type of analysis (+visualization) track local parameters at
+// different position are neccesary. A snapshots during the track
+// propagation are created.
+// (See AliExternalTrackParam class for desctiption of variables and
+// functionality)
+// Snapshots:
+// a. Current parameters - class itself (AliExternalTrackParam)
+// Contributors: general case TRD->TPC->ITS
+// Preferable usage: Decission - primary or secondary track
+// NOTICE - By default the track parameters are stored at the DCA point
+// to the primary vertex. optimal for primary tracks,
+// far from optimal for secondary tracks.
+// b. Constrained parameters - Kalman information updated with
+// the Primary vertex information
+// Contributors: general case TRD->TPC->ITS
+// Preferable usage: Use only for tracks selected as primary
+// NOTICE - not real constrain - taken as additional measurement
+// with corresponding error
+// Function:
+// const AliExternalTrackParam *GetConstrainedParam() const {return fCp;}
+// c. Inner parameters - Track parameters at inner wall of the TPC
+// Contributors: general case TRD->TPC
+// function:
+// const AliExternalTrackParam *GetInnerParam() const { return fIp;}
+//
+// d. TPCinnerparam - contributors - TPC only
+// Contributors: TPC
+// Preferable usage: Requested for HBT study
+// (smaller correlations as using also ITS information)
+// NOTICE - the track parameters are propagated to the DCA to
+// to primary vertex
+// Optimal for primary, far from optimal for secondary tracks
+// Function:
+// const AliExternalTrackParam *GetTPCInnerParam() const {return fTPCInner;}
+//
+// e. Outer parameters -
+// Contributors- general case - ITS-> TPC -> TRD
+// The last point - Outer parameters radius is determined
+// e.a) Local inclination angle bigger than threshold -
+// Low momenta tracks
+// e.a) Catastrofic energy losss in material
+// e.b) Not further improvement (no space points)
+// Usage:
+// a.) Tracking: Starting parameter for Refit inward
+// b.) Visualization
+// c.) QA
+// NOTICE: Should be not used for the physic analysis
+// Function:
+// const AliExternalTrackParam *GetOuterParam() const { return fOp;}
+//
//-----------------------------------------------------------------
#include <TMath.h>
#include "AliESDVertex.h"
#include "AliESDtrack.h"
#include "AliKalmanTrack.h"
+#include "AliVTrack.h"
#include "AliLog.h"
#include "AliTrackPointArray.h"
#include "TPolyMarker3D.h"
fTOFCalChannel(0),
fTOFindex(-1),
fHMPIDqn(0),
- fHMPIDcluIdx(0),
+ fHMPIDcluIdx(-1),
fEMCALindex(kEMCALNoMatch),
fHMPIDtrkTheta(0),
fHMPIDtrkPhi(0),
fTrackLength(0),
fdTPC(0),fzTPC(0),
fCddTPC(0),fCdzTPC(0),fCzzTPC(0),
+ fCchi2TPC(0),
fD(0),fZ(0),
fCdd(0),fCdz(0),fCzz(0),
fCchi2(0),
fTRDchi2(0),
fTOFchi2(0),
fHMPIDchi2(0),
+ fGlobalChi2(0),
fITSsignal(0),
fTPCsignal(0),
fTPCsignalS(0),
fTrackLength(track.fTrackLength),
fdTPC(track.fdTPC),fzTPC(track.fzTPC),
fCddTPC(track.fCddTPC),fCdzTPC(track.fCdzTPC),fCzzTPC(track.fCzzTPC),
+ fCchi2TPC(track.fCchi2TPC),
fD(track.fD),fZ(track.fZ),
fCdd(track.fCdd),fCdz(track.fCdz),fCzz(track.fCzz),
fCchi2(track.fCchi2),
fTRDchi2(track.fTRDchi2),
fTOFchi2(track.fTOFchi2),
fHMPIDchi2(track.fHMPIDchi2),
+ fGlobalChi2(track.fGlobalChi2),
fITSsignal(track.fITSsignal),
fTPCsignal(track.fTPCsignal),
fTPCsignalS(track.fTPCsignalS),
if (track.fFriendTrack) fFriendTrack=new AliESDfriendTrack(*(track.fFriendTrack));
}
+//_______________________________________________________________________
+AliESDtrack::AliESDtrack(const AliVTrack *track) :
+ AliExternalTrackParam(track),
+ fCp(0),
+ fIp(0),
+ fTPCInner(0),
+ fOp(0),
+ fFriendTrack(0),
+ fTPCClusterMap(159),//number of padrows
+ fTPCSharedMap(159),//number of padrows
+ fFlags(0),
+ fID(),
+ fLabel(0),
+ fITSLabel(0),
+ fTPCLabel(0),
+ fTRDLabel(0),
+ fTOFCalChannel(0),
+ fTOFindex(-1),
+ fHMPIDqn(0),
+ fHMPIDcluIdx(-1),
+ fEMCALindex(kEMCALNoMatch),
+ fHMPIDtrkTheta(0),
+ fHMPIDtrkPhi(0),
+ fHMPIDsignal(0),
+ fTrackLength(0),
+ fdTPC(0),fzTPC(0),
+ fCddTPC(0),fCdzTPC(0),fCzzTPC(0),
+ fCchi2TPC(0),
+ fD(0),fZ(0),
+ fCdd(0),fCdz(0),fCzz(0),
+ fCchi2(0),
+ fITSchi2(0),
+ fTPCchi2(0),
+ fTRDchi2(0),
+ fTOFchi2(0),
+ fHMPIDchi2(0),
+ fGlobalChi2(0),
+ fITSsignal(0),
+ fTPCsignal(0),
+ fTPCsignalS(0),
+ fTRDsignal(0),
+ fTRDQuality(0),
+ fTRDBudget(0),
+ fTOFsignal(0),
+ fTOFsignalToT(0),
+ fTOFsignalRaw(0),
+ fTOFsignalDz(0),
+ fHMPIDtrkX(0),
+ fHMPIDtrkY(0),
+ fHMPIDmipX(0),
+ fHMPIDmipY(0),
+ fTPCncls(0),
+ fTPCnclsF(0),
+ fTPCsignalN(0),
+ fITSncls(0),
+ fITSClusterMap(0),
+ fTRDncls(0),
+ fTRDncls0(0),
+ fTRDpidQuality(0),
+ fTRDnSlices(0),
+ fTRDslices(0x0)
+{
+ //
+ // ESD track from AliVTrack.
+ // This is not a copy constructor !
+ //
+
+ if (track->InheritsFrom("AliExternalTrackParam")) {
+ AliError("This is not a copy constructor. Use AliESDtrack(const AliESDtrack &) !");
+ AliWarning("Calling the default constructor...");
+ AliESDtrack();
+ return;
+ }
+
+ // Reset all the arrays
+ Int_t i;
+ for (i=0; i<AliPID::kSPECIES; i++) {
+ fTrackTime[i]=0.;
+ fR[i]=0.;
+ fITSr[i]=0.;
+ fTPCr[i]=0.;
+ fTRDr[i]=0.;
+ fTOFr[i]=0.;
+ fHMPIDr[i]=0.;
+ }
+
+ for (i=0; i<3; i++) { fKinkIndexes[i]=0;}
+ for (i=0; i<3; i++) { fV0Indexes[i]=-1;}
+ for (i=0;i<kTRDnPlanes;i++) {
+ fTRDTimBin[i]=0;
+ }
+ for (i=0;i<4;i++) {fTPCPoints[i]=0;}
+ for (i=0;i<3;i++) {fTOFLabel[i]=0;}
+ for (i=0;i<10;i++) {fTOFInfo[i]=0;}
+ for (i=0;i<12;i++) {fITSModule[i]=-1;}
+
+ // Set the ID
+ SetID(track->GetID());
+
+ // Set ITS cluster map
+ fITSClusterMap=track->GetITSClusterMap();
+
+ fITSncls=0;
+ for(i=0; i<6; i++) {
+ if(HasPointOnITSLayer(i)) fITSncls++;
+ }
+
+ // Set the combined PID
+ const Double_t *pid = track->PID();
+ if(pid){
+ for (i=0; i<AliPID::kSPECIES; i++) fR[i]=pid[i];
+ }
+ // AliESD track label
+ SetLabel(track->GetLabel());
+ // Set the status
+ SetStatus(track->GetStatus());
+}
+
//_______________________________________________________________________
AliESDtrack::AliESDtrack(TParticle * part) :
AliExternalTrackParam(),
fTOFCalChannel(0),
fTOFindex(-1),
fHMPIDqn(0),
- fHMPIDcluIdx(0),
+ fHMPIDcluIdx(-1),
fEMCALindex(kEMCALNoMatch),
fHMPIDtrkTheta(0),
fHMPIDtrkPhi(0),
fTrackLength(0),
fdTPC(0),fzTPC(0),
fCddTPC(0),fCdzTPC(0),fCzzTPC(0),
+ fCchi2TPC(0),
fD(0),fZ(0),
fCdd(0),fCdz(0),fCzz(0),
fCchi2(0),
fTRDchi2(0),
fTOFchi2(0),
fHMPIDchi2(0),
+ fGlobalChi2(0),
fITSsignal(0),
fTPCsignal(0),
fTPCsignalS(0),
fCddTPC = source.fCddTPC;
fCdzTPC = source.fCdzTPC;
fCzzTPC = source.fCzzTPC;
+ fCchi2TPC = source.fCchi2TPC;
+
fD = source.fD;
fZ = source.fZ;
fCdd = source.fCdd;
fCdz = source.fCdz;
fCzz = source.fCzz;
-
fCchi2 = source.fCchi2;
+
fITSchi2 = source.fITSchi2;
fTPCchi2 = source.fTPCchi2;
fTRDchi2 = source.fTRDchi2;
fTOFchi2 = source.fTOFchi2;
fHMPIDchi2 = source.fHMPIDchi2;
+ fGlobalChi2 = source.fGlobalChi2;
fITSsignal = source.fITSsignal;
fTPCsignal = source.fTPCsignal;
}
-const Bool_t AliESDtrack::FillTPCOnlyTrack(AliESDtrack &track){
+Bool_t AliESDtrack::FillTPCOnlyTrack(AliESDtrack &track){
// Fills the information of the TPC-only first reconstruction pass
// into the passed ESDtrack object. For consistency fTPCInner is also filled
// again
+
+
+ // For data produced before r26675
+ // RelateToVertexTPC was not properly called during reco
+ // so you'll have to call it again, before FillTPCOnlyTrack
+ // Float_t p[2],cov[3];
+ // track->GetImpactParametersTPC(p,cov);
+ // if(p[0]==0&&p[1]==0) // <- Default values
+ // track->RelateToVertexTPC(esd->GetPrimaryVertexTPC(),esd->GetMagneticField(),kVeryBig);
+
+
if(!fTPCInner)return kFALSE;
// fill the TPC track params to the global track parameters
track.fCddTPC = fCddTPC;
track.fCdzTPC = fCdzTPC;
track.fCzzTPC = fCzzTPC;
+ track.fCchi2TPC = fCchi2TPC;
// copy all other TPC specific parameters
track.fFlags = kTPCin;
track.fID = fID;
+ track.fFlags |= fFlags & kTPCpid; //copy the TPCpid status flag
for (Int_t i=0;i<3;i++) track.fKinkIndexes[i] = fKinkIndexes[i];
// Reset track parameters constrained to the primary vertex
delete fCp;fCp = 0;
- fCchi2 = 0;
// Reset track parameters at the inner wall of TPC
delete fIp;fIp = 0;
// Reset HMPID related track information
fHMPIDchi2 = 0;
fHMPIDqn = 0;
- fHMPIDcluIdx = 0;
+ fHMPIDcluIdx = -1;
fHMPIDsignal = 0;
for (Int_t i=0;i<AliPID::kSPECIES;i++) fHMPIDr[i] = 0;
fHMPIDtrkTheta = 0;
fHMPIDmipY = 0;
fEMCALindex = kEMCALNoMatch;
+ // reset global track chi2
+ fGlobalChi2 = 0;
+
delete fFriendTrack; fFriendTrack = 0;
}
//_______________________________________________________________________
fTPCsignal=t->GetPIDsignal();
break;
- case kTRDout: case kTRDin: case kTRDrefit:
+ case kTRDin: case kTRDrefit:
+ break;
+ case kTRDout:
index = fFriendTrack->GetTRDindices();
fTRDLabel = t->GetLabel();
fTRDchi2 = t->GetChi2();
return kTRUE;
}
+void
+AliESDtrack::SetOuterParam(const AliExternalTrackParam *p, ULong_t flags) {
+ //
+ // This is a direct setter for the outer track parameters
+ //
+ SetStatus(flags);
+ if (fOp) delete fOp;
+ fOp=new AliExternalTrackParam(*p);
+}
+
Bool_t
AliESDtrack::GetOuterExternalParameters
(Double_t &alpha, Double_t &x, Double_t p[5]) const {
if (fTOFindex != -1)
ncls = 1;
break;
+ case 4: //PHOS
+ break;
+ case 5: //HMPID
+ if ((fHMPIDcluIdx >= 0) && (fHMPIDcluIdx < 7000000)) {
+ if ((fHMPIDcluIdx%1000000 != 9999) && (fHMPIDcluIdx%1000000 != 99999)) {
+ ncls = 1;
+ }
+ }
+ break;
default:
break;
}
case 4: //PHOS
break;
case 5:
- if (fHMPIDcluIdx != 0) {
- idx[0] = GetHMPIDcluIdx();
- ncls = 1;
+ if ((fHMPIDcluIdx >= 0) && (fHMPIDcluIdx < 7000000)) {
+ if ((fHMPIDcluIdx%1000000 != 9999) && (fHMPIDcluIdx%1000000 != 99999)) {
+ idx[0] = GetHMPIDcluIdx();
+ ncls = 1;
+ }
}
break;
case 6: //EMCAL
//---------------------------------------------------------------------
if (idx!=0) {
Int_t *index=fFriendTrack->GetITSindices();
- for (Int_t i=0; i<AliESDfriendTrack::kMaxITScluster; i++) idx[i]=index[i];
+ for (Int_t i=0; i<AliESDfriendTrack::kMaxITScluster; i++) {
+ if ( (i>=fITSncls) && (i<6) ) idx[i]=-1;
+ else idx[i]=index[i];
+ }
}
return fITSncls;
}
//----------------------------------------------------------------------
if(fITSModule[ilayer]==-1) {
- AliError("fModule was not set !");
idet = -1;
status=0;
xloc=-99.; zloc=-99.;
}
//_______________________________________________________________________
-Bool_t AliESDtrack::RelateToVertexTPC
-(const AliESDVertex *vtx, Double_t b, Double_t maxd) {
+Bool_t AliESDtrack::RelateToVertexTPC(const AliESDVertex *vtx,
+Double_t b, Double_t maxd, AliExternalTrackParam *cParam) {
//
- // Try to relate the TPC-only track paramters to the vertex "vtx",
+ // Try to relate the TPC-only track parameters to the vertex "vtx",
// if the (rough) transverse impact parameter is not bigger then "maxd".
// Magnetic field is "b" (kG).
//
// a) The TPC-only paramters are extapolated to the DCA to the vertex.
// b) The impact parameters and their covariance matrix are calculated.
+ // c) An attempt to constrain the TPC-only params to the vertex is done.
+ // The constrained params are returned via "cParam".
//
+ // In the case of success, the returned value is kTRUE
+ // otherwise, it's kFALSE)
+ //
if (!fTPCInner) return kFALSE;
if (!vtx) return kFALSE;
fCdzTPC = cov[1];
fCzzTPC = cov[2];
+ Double_t covar[6]; vtx->GetCovMatrix(covar);
+ Double_t p[2]={GetParameter()[0]-dz[0],GetParameter()[1]-dz[1]};
+ Double_t c[3]={covar[2],0.,covar[5]};
+
+ Double_t chi2=GetPredictedChi2(p,c);
+ if (chi2>kVeryBig) return kFALSE;
+
+ fCchi2TPC=chi2;
+
+ if (!cParam) return kTRUE;
+
+ *cParam = *fTPCInner;
+ if (!cParam->Update(p,c)) return kFALSE;
+
return kTRUE;
}
//_______________________________________________________________________
-Bool_t AliESDtrack::RelateToVertex
-(const AliESDVertex *vtx, Double_t b, Double_t maxd) {
+Bool_t AliESDtrack::RelateToVertex(const AliESDVertex *vtx,
+Double_t b, Double_t maxd, AliExternalTrackParam *cParam) {
//
// Try to relate this track to the vertex "vtx",
// if the (rough) transverse impact parameter is not bigger then "maxd".
// a) The track gets extapolated to the DCA to the vertex.
// b) The impact parameters and their covariance matrix are calculated.
// c) An attempt to constrain this track to the vertex is done.
+ // The constrained params are returned via "cParam".
//
- // In the case of success, the returned value is kTRUE
- // (otherwise, it's kFALSE)
+ // In the case of success, the returned value is kTRUE
+ // (otherwise, it's kFALSE)
//
if (!vtx) return kFALSE;
Double_t c[3]={covar[2],0.,covar[5]};
Double_t chi2=GetPredictedChi2(p,c);
- if (chi2>77.) return kFALSE;
+ if (chi2>kVeryBig) return kFALSE;
+ fCchi2=chi2;
+
+
+ //--- Could now these lines be removed ? ---
delete fCp;
fCp=new AliExternalTrackParam(*this);
if (!fCp->Update(p,c)) {delete fCp; fCp=0; return kFALSE;}
-
- fCchi2=chi2;
+ //----------------------------------------
+
+
+ if (!cParam) return kTRUE;
+
+ *cParam = *this;
+ if (!cParam->Update(p,c)) return kFALSE;
+
return kTRUE;
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff