ClassImp(AliMUONTrack) // Class implementation in ROOT context
/// \endcond
+
+const Double_t AliMUONTrack::fgkMaxChi2 = 1.e10; ///< maximum chi2 above which the track can be considered as abnormal
+
+
//__________________________________________________________________________
AliMUONTrack::AliMUONTrack()
: TObject(),
paramCov(3,2) = paramCov(2,3);
paramCov(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ;
// Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
- paramCov(4,4) = ( ( bendingVertexDispersion*bendingVertexDispersion +
- (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) /
- bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum ;
- paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
- paramCov(4,2) = paramCov(2,4);
- paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ;
- paramCov(4,3) = paramCov(3,4);
-
- // Set covariances
+ if (AliMUONTrackExtrap::IsFieldON()) {
+ paramCov(4,4) = ( ( bendingVertexDispersion*bendingVertexDispersion +
+ (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) /
+ bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum ;
+ paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ paramCov(4,2) = paramCov(2,4);
+ paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ;
+ paramCov(4,3) = paramCov(3,4);
+ } else paramCov(4,4) = inverseBendingMomentum*inverseBendingMomentum;
trackParamAtFirstCluster.SetCovariances(paramCov);
// Compute and set track parameters covariances at last cluster
- paramCov(1,0) = - paramCov(1,0);
- paramCov(0,1) = - paramCov(0,1);
- paramCov(3,2) = - paramCov(3,2);
- paramCov(2,3) = - paramCov(2,3);
- paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
- paramCov(4,2) = paramCov(2,4);
+ // Non bending plane
+ paramCov(0,0) = lastCluster->GetErrX2();
+ paramCov(0,1) = - lastCluster->GetErrX2() / dZ;
+ paramCov(1,0) = paramCov(0,1);
+ // Bending plane
+ paramCov(2,2) = lastCluster->GetErrY2();
+ paramCov(2,3) = - lastCluster->GetErrY2() / dZ;
+ paramCov(3,2) = paramCov(2,3);
+ // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
+ if (AliMUONTrackExtrap::IsFieldON()) {
+ paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ paramCov(4,2) = paramCov(2,4);
+ }
trackParamAtLastCluster.SetCovariances(paramCov);
// Add track parameters at clusters
}
//__________________________________________________________________________
-void AliMUONTrack::UpdateTrackParamAtCluster()
+Bool_t AliMUONTrack::UpdateTrackParamAtCluster()
{
/// Update track parameters at each attached cluster
+ /// Return kFALSE in case of failure (i.e. extrapolation problem)
if (GetNClusters() == 0) {
AliWarning("no cluster attached to the track");
- return;
+ return kFALSE;
}
+ Bool_t extrapStatus = kTRUE;
AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First();
AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam);
while (trackParamAtCluster) {
trackParamAtCluster->SetZ(startingTrackParam->GetZ());
// extrapolation to the given z
- AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ());
+ if (!AliMUONTrackExtrap::ExtrapToZ(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE;
// prepare next step
startingTrackParam = trackParamAtCluster;
trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster));
}
+ // set global chi2 to max value in case of problem during track extrapolation
+ if (!extrapStatus) SetGlobalChi2(2.*MaxChi2());
+ return extrapStatus;
+
}
//__________________________________________________________________________
-void AliMUONTrack::UpdateCovTrackParamAtCluster()
+Bool_t AliMUONTrack::UpdateCovTrackParamAtCluster()
{
/// Update track parameters and their covariances at each attached cluster
/// Include effects of multiple scattering in chambers
+ /// Return kFALSE in case of failure (i.e. extrapolation problem)
if (GetNClusters() == 0) {
AliWarning("no cluster attached to the track");
- return;
+ return kFALSE;
}
+ Bool_t extrapStatus = kTRUE;
AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) fTrackParamAtCluster->First();
AliMUONTrackParam* trackParamAtCluster = (AliMUONTrackParam*) fTrackParamAtCluster->After(startingTrackParam);
Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() + 1;
currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
while (currentChamber > expectedChamber) {
// extrapolation to the missing chamber
- AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber));
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber))) extrapStatus = kFALSE;
// add MCS effect
AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.);
expectedChamber++;
}
// extrapolation to the z of the current cluster
- AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ())) extrapStatus = kFALSE;
// prepare next step
expectedChamber = currentChamber + 1;
trackParamAtCluster = (AliMUONTrackParam*) (fTrackParamAtCluster->After(trackParamAtCluster));
}
+ // set global chi2 to max value in case of problem during track extrapolation
+ if (!extrapStatus) SetGlobalChi2(2.*MaxChi2());
+ return extrapStatus;
+
}
//__________________________________________________________________________
/// Compute the chi2 of the track accounting for multiple scattering or not according to the flag
/// - Assume that track parameters at each cluster are corrects
/// - Assume the cluster weights matrices are corrects
- /// - Return negative value if chi2 computation failed
+ /// - Return a value of chi2 higher than the maximum allowed if computation failed
AliDebug(1,"Enter ComputeGlobalChi2");
if (!fTrackParamAtCluster) {
AliWarning("no cluster attached to this track");
- return 1.e10;
+ return 2.*MaxChi2();
}
Double_t chi2 = 0.;
}
//__________________________________________________________________________
-Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track, Bool_t inSt345) const
+Int_t AliMUONTrack::ClustersInCommon(AliMUONTrack* track) const
{
/// Returns the number of clusters in common between the current track ("this")
/// and the track pointed to by "track".
- /// If inSt345=kTRUE only stations 3, 4 and 5 are considered.
if (!fTrackParamAtCluster || !this->fTrackParamAtCluster) return 0;
+ Int_t nCluster1 = this->GetNClusters();
+ Int_t nCluster2 = track->GetNClusters();
Int_t clustersInCommon = 0;
AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2;
// Loop over clusters of first track
- trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->First();
- while (trackParamAtCluster1) {
- if ((!inSt345) || (trackParamAtCluster1->GetClusterPtr()->GetChamberId() > 3)) {
- // Loop over clusters of second track
- trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->First();
- while (trackParamAtCluster2) {
- if ((!inSt345) || (trackParamAtCluster2->GetClusterPtr()->GetChamberId() > 3)) {
- // Increment "clustersInCommon" if both trackParamAtCluster1 & 2 point to the same cluster
- if ((trackParamAtCluster1->GetClusterPtr()) == (trackParamAtCluster2->GetClusterPtr())) {
- clustersInCommon++;
- break;
- }
- }
- trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->After(trackParamAtCluster2);
- } // trackParamAtCluster2
+ for(Int_t iCluster1 = 0; iCluster1 < nCluster1; iCluster1++) {
+ trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->UncheckedAt(iCluster1);
+ // Loop over clusters of second track
+ for(Int_t iCluster2 = 0; iCluster2 < nCluster2; iCluster2++) {
+ trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->UncheckedAt(iCluster2);
+ // Increment "clustersInCommon" if both trackParamAtCluster1 & 2 point to the same cluster
+ if ((trackParamAtCluster1->GetClusterPtr()) == (trackParamAtCluster2->GetClusterPtr())) {
+ clustersInCommon++;
+ break;
+ }
}
- trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->After(trackParamAtCluster1);
- } // trackParamAtCluster1
+ }
+ return clustersInCommon;
+}
+
+ //__________________________________________________________________________
+Int_t AliMUONTrack::ClustersInCommonInSt345(AliMUONTrack* track) const
+{
+ /// Returns the number of clusters in common on stations 3, 4 and 5
+ /// between the current track ("this") and the track pointed to by "track".
+ if (!fTrackParamAtCluster || !this->fTrackParamAtCluster) return 0;
+ Int_t nCluster1 = this->GetNClusters();
+ Int_t nCluster2 = track->GetNClusters();
+ Int_t clustersInCommon = 0;
+ AliMUONTrackParam *trackParamAtCluster1, *trackParamAtCluster2;
+ // Loop over clusters of first track
+ for(Int_t iCluster1 = 0; iCluster1 < nCluster1; iCluster1++) {
+ trackParamAtCluster1 = (AliMUONTrackParam*) this->fTrackParamAtCluster->UncheckedAt(iCluster1);
+ if (trackParamAtCluster1->GetClusterPtr()->GetChamberId() < 4) continue;
+ // Loop over clusters of second track
+ for(Int_t iCluster2 = 0; iCluster2 < nCluster2; iCluster2++) {
+ trackParamAtCluster2 = (AliMUONTrackParam*) track->fTrackParamAtCluster->UncheckedAt(iCluster2);
+ if (trackParamAtCluster2->GetClusterPtr()->GetChamberId() < 4) continue;
+ // Increment "clustersInCommon" if both trackParamAtCluster1 & 2 point to the same cluster
+ if ((trackParamAtCluster1->GetClusterPtr()) == (trackParamAtCluster2->GetClusterPtr())) {
+ clustersInCommon++;
+ break;
+ }
+ }
+ }
return clustersInCommon;
}
/// return the chi2 value divided by the number of degrees of freedom (or FLT_MAX if ndf <= 0)
Double_t ndf = (Double_t) GetNDF();
- return (ndf > 0.) ? fGlobalChi2 / ndf : FLT_MAX;
+ return (ndf > 0.) ? fGlobalChi2 / ndf : 2.*MaxChi2();
}
//__________________________________________________________________________
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff