* provided "as is" without express or implied warranty. *
**************************************************************************/
+/* $Id$ */
+
///////////////////////////////////////////////////////////////////////////
// Implementation of the ITS track class
//
#include <TMath.h>
#include "AliCluster.h"
-#include "AliTracker.h"
#include "AliESDtrack.h"
+#include "AliESDVertex.h"
+#include "AliITSReconstructor.h"
#include "AliITStrackV2.h"
+#include "AliTracker.h"
const Int_t AliITStrackV2::fgkWARN = 5;
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;
}
for(Int_t i=0; i<4; i++) fdEdxSample[i]=0;
}
+//____________________________________________________________________________
+void AliITStrackV2::ResetClusters() {
+ //------------------------------------------------------------------
+ // Reset the array of attached clusters.
+ //------------------------------------------------------------------
+ for (Int_t i=0; i<2*AliITSgeomTGeo::kNLayers; i++) fIndex[i]=-1;
+ SetChi2(0.);
+ SetNumberOfClusters(0);
+}
+
+//____________________________________________________________________________
void AliITStrackV2::UpdateESDtrack(ULong_t flags) const {
+ // Update track params
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));
+ }
+ // copy the 4 dedx samples
+ Double_t sdedx[4]={0.,0.,0.,0.};
+ for(Int_t i=0; i<4; i++) sdedx[i]=fdEdxSample[i];
+ fESDtrack->SetITSdEdxSamples(sdedx);
}
//____________________________________________________________________________
//------------------------------------------------------------------
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, 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=GetY(), z=GetZ();
if (IsStartedTimeIntegral() && x>oldX) {
return kTRUE;
}
+//____________________________________________________________________________
+Bool_t AliITStrackV2::PropagateToTGeo(Double_t xToGo, Int_t nstep, Double_t &xOverX0, Double_t &xTimesRho, Bool_t addTime) {
+ //-------------------------------------------------------------------
+ // 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);
+ xTimesRho = sign*mparam[4]*mparam[0];
+ xOverX0 = mparam[1];
+ if (mparam[1]<900000) {
+ if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,
+ xTimesRho,GetMass())) return kFALSE;
+ } else { // this happens when MeanMaterialBudget cannot cross a boundary
+ return kFALSE;
+ }
+ }
+
+ if (addTime && 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 (!AliExternalTrackParam::Update(p,cov)) return kFALSE;
+ Int_t n=GetNumberOfClusters();
if (!Invariant()) {
- AliWarning("Wrong invariant !");
+ if (n>fgkWARN) AliWarning("Wrong invariant !");
return kFALSE;
}
if (chi2<0) return kTRUE;
- Int_t n=GetNumberOfClusters();
+ // fill residuals for ITS+TPC tracks
+ if (fESDtrack) {
+ if (fESDtrack->GetStatus()&AliESDtrack::kTPCin) {
+ AliTracker::FillResiduals(this,p,cov,c->GetVolumeId());
+ }
+ }
+
fIndex[n]=index;
SetNumberOfClusters(n+1);
SetChi2(GetChi2()+chi2);
//------------------------------------------------------------------
Int_t n=GetNumberOfClusters();
+ // take into account the misalignment error
+ Float_t maxMisalErrY2=0,maxMisalErrZ2=0;
+ for (Int_t lay=0; lay<AliITSgeomTGeo::kNLayers; lay++) {
+ maxMisalErrY2 = TMath::Max(maxMisalErrY2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorY(lay));
+ maxMisalErrZ2 = TMath::Max(maxMisalErrZ2,AliITSReconstructor::GetRecoParam()->GetClusterMisalErrorZ(lay));
+ }
+ maxMisalErrY2 *= maxMisalErrY2;
+ maxMisalErrZ2 *= maxMisalErrZ2;
+ // this is because when we reset before refitting, we multiply the
+ // matrix by 10
+ maxMisalErrY2 *= 10.;
+ maxMisalErrZ2 *= 10.;
+
Double_t sP2=GetParameter()[2];
if (TMath::Abs(sP2) >= kAlmost1){
if (n>fgkWARN) Warning("Invariant","fP2=%f\n",sP2);
return kFALSE;
}
Double_t sC00=GetCovariance()[0];
- if (sC00<=0 || sC00>9.) {
+ if (sC00<=0 || sC00>(9.+maxMisalErrY2)) {
if (n>fgkWARN) Warning("Invariant","fC00=%f\n",sC00);
return kFALSE;
}
Double_t sC11=GetCovariance()[2];
- if (sC11<=0 || sC11>9.) {
+ if (sC11<=0 || sC11>(9.+maxMisalErrZ2)) {
if (n>fgkWARN) Warning("Invariant","fC11=%f\n",sC11);
return kFALSE;
}
if (!AliExternalTrackParam::Propagate(alp,xk,bz)) return kFALSE;
if (!Invariant()) {
- AliWarning("Wrong invariant !");
- return kFALSE;
+ Int_t n=GetNumberOfClusters();
+ if (n>fgkWARN) AliWarning("Wrong invariant !");
+ 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;
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;
//-----------------------------------------------------------------
// This function calculates dE/dX within the "low" and "up" cuts.
// Origin: Boris Batyunya, JINR, Boris.Batiounia@cern.ch
+ // Updated: F. Prino 8-June-2009
//-----------------------------------------------------------------
- // The clusters order is: SSD-2, SSD-1, SDD-2, SDD-1, SPD-2, SPD-1
+ // The cluster order is: SDD-1, SDD-2, SSD-1, SSD-2
- Int_t i;
Int_t nc=0;
- for (i=0; i<GetNumberOfClusters(); i++) {
- Int_t idx=GetClusterIndex(i);
- idx=(idx&0xf0000000)>>28;
- if (idx>1) nc++; // Take only SSD and SDD
+ Float_t dedx[4];
+ for (Int_t il=0; il<4; il++) { // count good (>0) dE/dx values
+ if(fdEdxSample[il]>0.){
+ dedx[nc]= fdEdxSample[il];
+ nc++;
+ }
+ }
+ if(nc<1){
+ SetdEdx(0.);
+ return;
}
- Int_t swap;//stupid sorting
+ Int_t swap; // sort in ascending order
do {
swap=0;
- for (i=0; i<nc-1; i++) {
- if (fdEdxSample[i]<=fdEdxSample[i+1]) continue;
- Float_t tmp=fdEdxSample[i];
- fdEdxSample[i]=fdEdxSample[i+1]; fdEdxSample[i+1]=tmp;
+ for (Int_t i=0; i<nc-1; i++) {
+ if (dedx[i]<=dedx[i+1]) continue;
+ Float_t tmp=dedx[i];
+ dedx[i]=dedx[i+1];
+ dedx[i+1]=tmp;
swap++;
}
} while (swap);
- Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); //b.b. to take two lowest dEdX
- // values from four ones choose
- // nu=2
- Float_t dedx=0;
- for (i=nl; i<nu; i++) dedx += fdEdxSample[i];
- if (nu-nl>0) dedx /= (nu-nl);
-
- SetdEdx(dedx);
-}
-Double_t AliITStrackV2::GetBz() const {
- //
- // returns Bz component of the magnetic field (kG)
- //
- if (AliTracker::UniformField()) return AliTracker::GetBz();
- Double_t r[3]; GetXYZ(r);
- return AliTracker::GetBz(r);
+ Double_t nl=low*nc, nu =up*nc;
+ Float_t sumamp = 0;
+ Float_t sumweight =0;
+ for (Int_t i=0; i<nc; i++) {
+ Float_t weight =1;
+ if (i<nl+0.1) weight = TMath::Max(1.-(nl-i),0.);
+ if (i>nu-1) weight = TMath::Max(nu-i,0.);
+ sumamp+= dedx[i]*weight;
+ sumweight+=weight;
+ }
+ SetdEdx(sumamp/sumweight);
}
//____________________________________________________________________________
Bool_t AliITStrackV2::
-GetPhiZat(Double_t rk, Double_t &phik, Double_t &zk) const {
+GetPhiZat(Double_t r, Double_t &phi, Double_t &z) const {
//------------------------------------------------------------------
- // This function returns the global cylindrical (phik,zk) of the track
- // position estimated at the radius rk.
+ // 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) > rk) return kFALSE;
+ if (TMath::Abs(d) > r) {
+ if (r>1e-1) return kFALSE;
+ r = TMath::Abs(d);
+ }
- Double_t r=TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
- Double_t phi=GetAlpha()+TMath::ASin(GetSnp());
+ Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
+ if (TMath::Abs(d) > rcurr) return kFALSE;
+ Double_t globXYZcurr[3]; GetXYZ(globXYZcurr);
+ Double_t phicurr=TMath::ATan2(globXYZcurr[1],globXYZcurr[0]);
- phik=phi+TMath::ASin(d/rk)-TMath::ASin(d/r);
- zk=GetZ()+GetTgl()*(TMath::Sqrt(rk*rk-d*d) - TMath::Sqrt(r*r-d*d));
+ if (GetX()>=0.) {
+ phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr);
+ } else {
+ phi=phicurr+TMath::ASin(d/r)+TMath::ASin(d/rcurr)-TMath::Pi();
+ }
+ // return a phi in [0,2pi[
+ if (phi<0.) phi+=2.*TMath::Pi();
+ else if (phi>=2.*TMath::Pi()) phi-=2.*TMath::Pi();
+ 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) {
+ if (r>1e-1) return kFALSE;
+ r = TMath::Abs(d);
+ }
+
+ Double_t rcurr=TMath::Sqrt(GetX()*GetX() + GetY()*GetY());
+ Double_t globXYZcurr[3]; GetXYZ(globXYZcurr);
+ Double_t phicurr=TMath::ATan2(globXYZcurr[1],globXYZcurr[0]);
+ Double_t phi;
+ if (GetX()>=0.) {
+ phi=phicurr+TMath::ASin(d/r)-TMath::ASin(d/rcurr);
+ } else {
+ phi=phicurr+TMath::ASin(d/r)+TMath::ASin(d/rcurr)-TMath::Pi();
+ }
+
+ xloc=r*(TMath::Cos(phi)*TMath::Cos(GetAlpha())
+ +TMath::Sin(phi)*TMath::Sin(GetAlpha()));
+ return kTRUE;
+}
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