* provided "as is" without express or implied warranty. *
**************************************************************************/
+/* $Id$ */
+
///////////////////////////////////////////////////////////////////////////
// Implementation of the ITS track class
//
#include "AliESDtrack.h"
#include "AliITStrackV2.h"
+const Int_t AliITStrackV2::fgkWARN = 5;
+
ClassImp(AliITStrackV2)
-const Int_t kWARN=5;
//____________________________________________________________________________
AliITStrackV2::AliITStrackV2() : AliKalmanTrack(),
fdEdx(0),
fESDtrack(0)
{
- for(Int_t i=0; i<2*kMaxLayer; i++) fIndex[i]=-1;
- for(Int_t i=0; i<4; i++) fdEdxSample[i]=0;
+ for(Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) {fIndex[i]=-1; fModule[i]=-1;}
+ for(Int_t i=0; i<4; i++) fdEdxSample[i]=0;
}
void AliITStrackV2::UpdateESDtrack(ULong_t flags) const {
fESDtrack->UpdateTrackParams(this,flags);
+ // copy the module indices
+ for(Int_t i=0;i<12;i++) {
+ // printf(" %d\n",GetModuleIndex(i));
+ fESDtrack->SetITSModuleIndex(i,GetModuleIndex(i));
+ }
}
//____________________________________________________________________________
//------------------------------------------------------------------
Int_t i;
for (i=0; i<4; i++) fdEdxSample[i]=t.fdEdxSample[i];
- for (i=0; i<2*kMaxLayer; i++) fIndex[i]=t.fIndex[i];
+ for (i=0; i<2*AliITSgeomTGeo::GetNLayers(); i++) {
+ fIndex[i]=t.fIndex[i];
+ fModule[i]=t.fModule[i];
+ }
}
//_____________________________________________________________________________
// This function compares tracks according to the their curvature
//-----------------------------------------------------------------
AliITStrackV2 *t=(AliITStrackV2*)o;
- //Double_t co=TMath::Abs(t->Get1Pt());
- //Double_t c =TMath::Abs(Get1Pt());
+ //Double_t co=OneOverPt();
+ //Double_t c =OneOverPt();
Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
Double_t c =GetSigmaY2()*GetSigmaZ2();
if (c>co) return 1;
//This function propagates a track to the minimal distance from the origin
//------------------------------------------------------------------
Double_t bz=GetBz();
- if (PropagateToDCA(v,bz,kVeryBig))
- if (AliExternalTrackParam::CorrectForMaterial(d,x0,GetMass())) return kTRUE;
+ if (PropagateToDCA(v,bz,kVeryBig)) {
+ Double_t xOverX0,xTimesRho;
+ xOverX0 = d; xTimesRho = d*x0;
+ if (CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kTRUE;
+ }
return kFALSE;
}
//____________________________________________________________________________
Bool_t AliITStrackV2::
-GetGlobalXYZat(Double_t xk, Double_t &x, Double_t &y, Double_t &z) const {
+GetGlobalXYZat(Double_t xloc, Double_t &x, Double_t &y, Double_t &z) const {
//------------------------------------------------------------------
//This function returns a track position in the global system
//------------------------------------------------------------------
Double_t r[3];
- Bool_t rc=GetXYZAt(xk, AliTracker::GetBz(), r);
+ Bool_t rc=GetXYZAt(xloc, AliTracker::GetBz(), r);
x=r[0]; y=r[1]; z=r[2];
return rc;
}
//------------------------------------------------------------------
//This function propagates a track
//------------------------------------------------------------------
+
Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
Double_t bz=GetBz();
if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
- if (!AliExternalTrackParam::CorrectForMaterial(d,x0,GetMass())) return kFALSE;
+ Double_t xOverX0,xTimesRho;
+ xOverX0 = d; xTimesRho = d*x0;
+ if (!CorrectForMeanMaterial(xOverX0,xTimesRho,kTRUE)) return kFALSE;
- Double_t x=GetX(), y=GetZ(), z=GetZ();
+ Double_t x=GetX(), y=GetY(), z=GetZ();
if (IsStartedTimeIntegral() && x>oldX) {
Double_t l2 = (x-oldX)*(x-oldX) + (y-oldY)*(y-oldY) + (z-oldZ)*(z-oldZ);
AddTimeStep(TMath::Sqrt(l2));
return kTRUE;
}
+//____________________________________________________________________________
+Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho) {
+ //-------------------------------------------------------------------
+ // Propagates the track to a reference plane x=xToGo in n steps.
+ // These n steps are only used to take into account the curvature.
+ // The material is calculated with TGeo. (L.Gaudichet)
+ //-------------------------------------------------------------------
+
+ Double_t startx = GetX(), starty = GetY(), startz = GetZ();
+ Double_t sign = (startx<xToGo) ? -1.:1.;
+ Double_t step = (xToGo-startx)/TMath::Abs(nstep);
+
+ Double_t start[3], end[3], mparam[7], bz = GetBz();
+ Double_t x = startx;
+
+ for (Int_t i=0; i<nstep; i++) {
+
+ GetXYZ(start); //starting global position
+ x += step;
+ if (!GetXYZAt(x, bz, end)) return kFALSE;
+ if (!AliExternalTrackParam::PropagateTo(x, bz)) return kFALSE;
+ AliTracker::MeanMaterialBudget(start, end, mparam);
+ if (mparam[1]<900000) {
+ xTimesRho = sign*mparam[4]*mparam[0];
+ xOverX0 = mparam[1];
+ if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,
+ xTimesRho,GetMass())) return kFALSE;
+ }
+ }
+
+ if (IsStartedTimeIntegral() && GetX()>startx) {
+ Double_t l2 = ( (GetX()-startx)*(GetX()-startx) +
+ (GetY()-starty)*(GetY()-starty) +
+ (GetZ()-startz)*(GetZ()-startz) );
+ AddTimeStep(TMath::Sqrt(l2));
+ }
+
+ return kTRUE;
+}
+
//____________________________________________________________________________
Bool_t AliITStrackV2::Update(const AliCluster* c, Double_t chi2, Int_t index)
{
if (chi2<0) return kTRUE;
+ AliTracker::FillResiduals(this,p,cov,c->GetVolumeId());
+
Int_t n=GetNumberOfClusters();
fIndex[n]=index;
SetNumberOfClusters(n+1);
Double_t sP2=GetParameter()[2];
if (TMath::Abs(sP2) >= kAlmost1){
- if (n>kWARN) Warning("Invariant","fP2=%f\n",sP2);
+ if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2);
return kFALSE;
}
Double_t sC00=GetCovariance()[0];
if (sC00<=0 || sC00>9.) {
- if (n>kWARN) Warning("Invariant","fC00=%f\n",sC00);
+ if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00);
return kFALSE;
}
Double_t sC11=GetCovariance()[2];
if (sC11<=0 || sC11>9.) {
- if (n>kWARN) Warning("Invariant","fC11=%f\n",sC11);
+ if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11);
return kFALSE;
}
Double_t sC22=GetCovariance()[5];
if (sC22<=0 || sC22>1.) {
- if (n>kWARN) Warning("Invariant","fC22=%f\n",sC22);
+ if (n>fgkWARN) Warning("Invariant","fC22=%f\n",sC22);
return kFALSE;
}
Double_t sC33=GetCovariance()[9];
if (sC33<=0 || sC33>1.) {
- if (n>kWARN) Warning("Invariant","fC33=%f\n",sC33);
+ if (n>fgkWARN) Warning("Invariant","fC33=%f\n",sC33);
return kFALSE;
}
Double_t sC44=GetCovariance()[14];
if (sC44<=0 /*|| sC44>6e-5*/) {
- if (n>kWARN) Warning("Invariant","fC44=%f\n",sC44);
+ if (n>fgkWARN) Warning("Invariant","fC44=%f\n",sC44);
return kFALSE;
}
return kTRUE;
}
+Bool_t AliITStrackV2::MeanBudgetToPrimVertex(Double_t xyz[3], Double_t step, Double_t &d) const {
+
+ //-------------------------------------------------------------------
+ // Get the mean material budget between the actual point and the
+ // primary vertex. (L.Gaudichet)
+ //-------------------------------------------------------------------
+
+ Double_t cs=TMath::Cos(GetAlpha()), sn=TMath::Sin(GetAlpha());
+ Double_t vertexX = xyz[0]*cs + xyz[1]*sn;
+
+ Int_t nstep = Int_t((GetX()-vertexX)/step);
+ if (nstep<1) nstep = 1;
+ step = (GetX()-vertexX)/nstep;
+
+ // Double_t mparam[7], densMean=0, radLength=0, length=0;
+ Double_t mparam[7];
+ Double_t p1[3], p2[3], x = GetX(), bz = GetBz();
+ GetXYZ(p1);
+
+ d=0.;
+
+ for (Int_t i=0; i<nstep; i++) {
+ x += step;
+ if (!GetXYZAt(x, bz, p2)) return kFALSE;
+ AliTracker::MeanMaterialBudget(p1, p2, mparam);
+ if (mparam[1]>900000) return kFALSE;
+ d += mparam[1];
+
+ p1[0] = p2[0];
+ p1[1] = p2[1];
+ p1[2] = p2[2];
+ }
+
+ return kTRUE;
+}
+
Bool_t AliITStrackV2::Improve(Double_t x0,Double_t xyz[3],Double_t ers[3]) {
//------------------------------------------------------------------
//This function improves angular track parameters
Double_t dy = Par(0) - yv, dz = Par(1) - zv;
Double_t r2=GetX()*GetX() + dy*dy;
- Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
+ Double_t p2=(1.+ GetTgl()*GetTgl())/(GetSigned1Pt()*GetSigned1Pt());
Double_t beta2=p2/(p2 + GetMass()*GetMass());
x0*=TMath::Sqrt((1.+ GetTgl()*GetTgl())/(1.- GetSnp()*GetSnp()));
Double_t theta2=14.1*14.1/(beta2*p2*1e6)*x0;
sigma2p += Cov(0)/r2*(1.- dy*dy/r2)*(1.- dy*dy/r2);
sigma2p += ers[1]*ers[1]/r2;
sigma2p += 0.25*Cov(14)*cnv*cnv*GetX()*GetX();
- Double_t eps2p=sigma2p/(Cov(2) + sigma2p);
+ Double_t eps2p=sigma2p/(Cov(5) + sigma2p);
Par(0) += Cov(3)/(Cov(5) + sigma2p)*(parp - GetSnp());
Par(2) = eps2p*GetSnp() + (1 - eps2p)*parp;
Cov(5) *= eps2p;
Par(4) += Cov(13)/(Cov(9) + sigma2l)*(parl - Par(3));
Par(3) = eps2l*Par(3) + (1-eps2l)*parl;
Cov(9) *= eps2l;
- Cov(13)*= (eps2l/cnv/cnv);
+ Cov(13)*= eps2l;
Cov(7) *= eps2l;
}
if (!Invariant()) return kFALSE;
return AliTracker::GetBz(r);
}
+//____________________________________________________________________________
+Bool_t AliITStrackV2::
+GetPhiZat(Double_t r, Double_t &phi, Double_t &z) const {
+ //------------------------------------------------------------------
+ // This function returns the global cylindrical (phi,z) of the track
+ // position estimated at the radius r.
+ // The track curvature is neglected.
+ //------------------------------------------------------------------
+ Double_t d=GetD(0.,0.);
+ if (TMath::Abs(d) > r) return kFALSE;
+
+ Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
+ if (TMath::Abs(d) > rcurr) return kFALSE;
+ Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp());
+
+ phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr);
+ z=GetZ()+GetTgl()*(TMath::Sqrt((r-d)*(r+d))-TMath::Sqrt((rcurr-d)*(rcurr+d)));
+ return kTRUE;
+}
+//____________________________________________________________________________
+Bool_t AliITStrackV2::
+GetLocalXat(Double_t r,Double_t &xloc) const {
+ //------------------------------------------------------------------
+ // This function returns the local x of the track
+ // position estimated at the radius r.
+ // The track curvature is neglected.
+ //------------------------------------------------------------------
+ Double_t d=GetD(0.,0.);
+ if (TMath::Abs(d) > r) return kFALSE;
+
+ Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
+ Double_t phicurr=GetAlpha()+TMath::ASin(GetSnp());
+ Double_t phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr);
+
+ xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha())
+ +TMath::Sin(phi)*TMath::Sin(GetAlpha()));
+
+ return kTRUE;
+}
+
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