#include <Riostream.h>
#include <TMath.h>
#include <TMatrixD.h>
+#include <TClonesArray.h>
/// \cond CLASSIMP
ClassImp(AliMUONTrackReconstructorK) // Class implementation in ROOT context
fRecTracksPtr->Remove(track);
fNRecTracks--;
} else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks));
delete segments;
return kFALSE;
}
} else {
if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
delete segments;
return kFALSE;
}
// skip empty slots
if(!track) continue;
- // retrace tracks using Kalman filter
- RetraceTrack(*track,kTRUE);
-
- // remove tracks out of limits
- if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
+ // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits
+ if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
fRecTracksPtr->Remove(track);
fNRecTracks--;
}
// Keep only the best tracks if required
if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
- else if (AliMUONTrackExtrap::IsFieldON()) fRecTracksPtr->Compress();
+ else fRecTracksPtr->Compress();
AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
// abort tracking if there are too many candidates
if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
delete segments;
return kFALSE;
}
// skip empty slots
if(!track) continue;
- // retrace tracks using Kalman filter
- RetraceTrack(*track,kTRUE);
-
- // remove tracks with absolute bending momentum out of limits
- if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
+ // retrace tracks using Kalman filter and remove the ones for which extrap failed or that are out of limits
+ if (!RetraceTrack(*track,kTRUE) || !IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
fRecTracksPtr->Remove(track);
fNRecTracks--;
}
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::RetraceTrack(AliMUONTrack &trackCandidate, Bool_t resetSeed)
+Bool_t AliMUONTrackReconstructorK::RetraceTrack(AliMUONTrack &trackCandidate, Bool_t resetSeed)
{
/// Re-run the kalman filter from the most downstream cluster to the most uptream one
+ /// Return kFALSE in case of failure (i.e. extrapolation problem)
AliDebug(1,"Enter RetraceTrack");
AliMUONTrackParam* lastTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Last();
}
// Redo the tracking
- RetracePartialTrack(trackCandidate, lastTrackParam);
+ return RetracePartialTrack(trackCandidate, lastTrackParam);
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::RetracePartialTrack(AliMUONTrack &trackCandidate, const AliMUONTrackParam* startingTrackParam)
+Bool_t AliMUONTrackReconstructorK::RetracePartialTrack(AliMUONTrack &trackCandidate, const AliMUONTrackParam* startingTrackParam)
{
/// Re-run the kalman filter from the cluster attached to startingTrackParam to the most uptream cluster
+ /// Return kFALSE in case of failure (i.e. extrapolation problem)
AliDebug(1,"Enter RetracePartialTrack");
// Printout for debuging
trackCandidate.SetGlobalChi2(startingTrackParam->GetTrackChi2());
// loop over attached clusters until the first one and recompute track parameters and covariances using kalman filter
+ Bool_t extrapStatus = kTRUE;
Int_t expectedChamber = startingTrackParam->GetClusterPtr()->GetChamberId() - 1;
Int_t currentChamber;
Double_t addChi2TrackAtCluster;
trackParamAtCluster->SetCovariances(startingTrackParam->GetCovariances());
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber+1),-1.);
// reset propagator for smoother
if (GetRecoParam()->UseSmoother()) trackParamAtCluster->ResetPropagator();
currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
while (currentChamber < expectedChamber) {
// extrapolation to the missing chamber (update the propagator)
- AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber),
- GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber),
+ GetRecoParam()->UseSmoother())) extrapStatus = kFALSE;
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(expectedChamber),-1.);
expectedChamber--;
}
// extrapolation to the plane of the cluster attached to the current trackParamAtCluster (update the propagator)
- AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(),
- GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(),
+ GetRecoParam()->UseSmoother())) extrapStatus = kFALSE;
if (GetRecoParam()->UseSmoother()) {
// save extrapolated parameters for smoother
cout << "RetracePartialTrack: track chi2 after re-tracking: " << trackCandidate.GetGlobalChi2() << endl;
}
+ // set global chi2 to max value in case of problem during track extrapolation
+ if (!extrapStatus) trackCandidate.SetGlobalChi2(2.*AliMUONTrack::MaxChi2());
+ return extrapStatus;
+
}
//__________________________________________________________________________
// abort tracking if there are too many candidates
if (GetRecoParam()->RequestStation(station)) {
if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks));
return kFALSE;
}
} else {
if ((fNRecTracks + currentNRecTracks - iRecTrack - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1));
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1));
return kFALSE;
}
}
Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
Double_t addChi2TrackAtCluster;
- Double_t bestAddChi2TrackAtCluster = 1.e10;
+ Double_t bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2();
Bool_t foundOneCluster = kFALSE;
AliMUONTrack *newTrack = 0x0;
AliMUONVCluster *cluster;
}
// Add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
// reset propagator for smoother
if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator();
// Add MCS in the missing chamber(s) if any
- Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
while (currentChamber > nextChamber + 1) {
// extrapolation to the missing chamber
currentChamber--;
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber),
- GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber),
+ GetRecoParam()->UseSmoother())) return kFALSE;
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
}
//Extrapolate trackCandidate to chamber
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber),
- GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber),
+ GetRecoParam()->UseSmoother())) return kFALSE;
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
Double_t addChi2TrackAtCluster1;
Double_t addChi2TrackAtCluster2;
- Double_t bestAddChi2TrackAtCluster1 = 1.e10;
- Double_t bestAddChi2TrackAtCluster2 = 1.e10;
+ Double_t bestAddChi2TrackAtCluster1 = AliMUONTrack::MaxChi2();
+ Double_t bestAddChi2TrackAtCluster2 = AliMUONTrack::MaxChi2();
Bool_t foundOneCluster = kFALSE;
Bool_t foundTwoClusters = kFALSE;
AliMUONTrack *newTrack = 0x0;
AliMUONTrackParam bestTrackParamAtCluster1;
AliMUONTrackParam bestTrackParamAtCluster2;
- Int_t nClusters = clusterStore.GetSize();
- Bool_t *clusterCh1Used = new Bool_t[nClusters];
- for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
- Int_t iCluster1;
-
// Get track parameters according to the propagation direction
-
if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
}
// Add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
// reset propagator for smoother
if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator();
// Add MCS in the missing chamber(s) if any
- Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
while (ch1 < ch2 && currentChamber > ch2 + 1) {
// extrapolation to the missing chamber
currentChamber--;
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber),
- GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber),
+ GetRecoParam()->UseSmoother())) return kFALSE;
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
}
//Extrapolate trackCandidate to chamber "ch2"
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2),
- GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2),
+ GetRecoParam()->UseSmoother())) return kFALSE;
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation);
}
+ Int_t nClusters = clusterStore.GetSize();
+ Bool_t *clusterCh1Used = new Bool_t[nClusters];
+ for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
+ Int_t iCluster1;
+
// Create iterators to loop over clusters in both chambers
TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
extrapTrackParam = extrapTrackParamAtCluster2;
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
// reset propagator for smoother
if (GetRecoParam()->UseSmoother()) extrapTrackParam.ResetPropagator();
//Extrapolate track parameters to chamber "ch1"
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1),
- GetRecoParam()->UseSmoother());
+ Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1),
+ GetRecoParam()->UseSmoother());
// reset cluster iterator of chamber 1
nextInCh1.Reset();
// look for second candidates in chamber 1
Bool_t foundSecondCluster = kFALSE;
- while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
+
if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
iCluster1++;
// try to add the current cluster fast
if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
// add MCS effect for next step
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
//Extrapolate trackCandidate to chamber "ch1"
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1),
- GetRecoParam()->UseSmoother());
+ Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1),
+ GetRecoParam()->UseSmoother());
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
iCluster1 = -1;
// look for second candidates in chamber 1
- while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
+
if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
iCluster1++;
if (clusterCh1Used[iCluster1]) continue; // Skip clusters already used
paramWeight.Invert();
} else {
AliWarning(" Determinant = 0");
- return 1.e10;
+ return 2.*AliMUONTrack::MaxChi2();
}
// Compute the new cluster weight (U)
newParamCov.Invert();
} else {
AliWarning(" Determinant = 0");
- return 1.e10;
+ return 2.*AliMUONTrack::MaxChi2();
}
// Save the new parameters covariance matrix
trackCandidate.RemoveTrackParamAtCluster((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(worstClusterNumber));
// Re-calculate track parameters at the (new) first cluster
- RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1));
+ if (!RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1))) return kFALSE;
// skip track out of limits
if (!IsAcceptable(*((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First()))) return kFALSE;
// Smoothed parameters and covariances at first cluster = filtered parameters and covariances
previousTrackParam->SetSmoothParameters(previousTrackParam->GetParameters());
previousTrackParam->SetSmoothCovariances(previousTrackParam->GetCovariances());
+
+ AliMUONTrackParam *currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam);
- // Compute local chi2 at first cluster
- AliMUONVCluster *cluster = previousTrackParam->GetClusterPtr();
- Double_t dX = cluster->GetX() - previousTrackParam->GetNonBendingCoor();
- Double_t dY = cluster->GetY() - previousTrackParam->GetBendingCoor();
- Double_t chi2 = dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2();
+ // Save local chi2 at first cluster = last additional chi2 provided by Kalman
+ previousTrackParam->SetLocalChi2(previousTrackParam->GetTrackChi2() - currentTrackParam->GetTrackChi2());
- // Save local chi2 at first cluster
- previousTrackParam->SetLocalChi2(chi2);
+ // if the track contains only 2 clusters simply copy the filtered parameters
+ if (track.GetNClusters() == 2) {
+ currentTrackParam->SetSmoothParameters(currentTrackParam->GetParameters());
+ currentTrackParam->SetSmoothCovariances(currentTrackParam->GetCovariances());
+ currentTrackParam->SetLocalChi2(currentTrackParam->GetTrackChi2());
+ return kTRUE;
+ }
- AliMUONTrackParam *currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam);
while (currentTrackParam) {
// Get variables
const TMatrixD &filteredCovariances = currentTrackParam->GetCovariances(); // C(k k)
const TMatrixD &previousSmoothCovariances = previousTrackParam->GetSmoothCovariances(); // C(k+1 n)
- // Compute smoother gain: A(k) = C(kk) * F(f)^t * (C(k+1 k))^-1
+ // Compute smoother gain: A(k) = C(kk) * F(k)^t * (C(k+1 k))^-1
TMatrixD extrapWeight(extrapCovariances);
if (extrapWeight.Determinant() != 0) {
extrapWeight.Invert(); // (C(k+1 k))^-1
AliWarning(" Determinant = 0");
return kFALSE;
}
- TMatrixD smootherGain(filteredCovariances,TMatrixD::kMultTranspose,propagator); // C(kk) * F(f)^t
- smootherGain *= extrapWeight; // C(kk) * F(f)^t * (C(k+1 k))^-1
+ TMatrixD smootherGain(filteredCovariances,TMatrixD::kMultTranspose,propagator); // C(kk) * F(k)^t
+ smootherGain *= extrapWeight; // C(kk) * F(k)^t * (C(k+1 k))^-1
// Compute smoothed parameters: X(k n) = X(k k) + A(k) * (X(k+1 n) - X(k+1 k))
TMatrixD tmpParam(previousSmoothParameters,TMatrixD::kMinus,extrapParameters); // X(k+1 n) - X(k+1 k)
currentTrackParam->SetSmoothCovariances(smoothCovariances);
// Compute smoothed residual: r(k n) = cluster - X(k n)
- cluster = currentTrackParam->GetClusterPtr();
+ AliMUONVCluster* cluster = currentTrackParam->GetClusterPtr();
TMatrixD smoothResidual(2,1);
smoothResidual.Zero();
smoothResidual(0,0) = cluster->GetX() - smoothParameters(0,0);
/// Complete tracks by adding missing clusters (if there is an overlap between
/// two detection elements, the track may have two clusters in the same chamber).
/// Recompute track parameters and covariances at each clusters.
- /// Return kTRUE if one or more tracks have been complemented.
+ /// Remove tracks getting abnormal (i.e. extrapolation failed...) after being complemented.
+ /// Return kTRUE if one or more tracks have been complemented or removed.
AliDebug(1,"Enter ComplementTracks");
Int_t chamberId, detElemId;
Bool_t foundOneCluster, trackModified, hasChanged = kFALSE;
AliMUONVCluster *cluster;
AliMUONTrackParam *trackParam, *previousTrackParam, *nextTrackParam, trackParamAtCluster, bestTrackParamAtCluster;
+ AliMUONTrack *nextTrack;
AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First();
while (track) {
previousTrackParam = trackParam;
while (trackParam) {
foundOneCluster = kFALSE;
- bestAddChi2TrackAtCluster = 1.e10;
+ bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2();
chamberId = trackParam->GetClusterPtr()->GetChamberId();
detElemId = trackParam->GetClusterPtr()->GetDetElemId();
trackParam = nextTrackParam;
}
+ // prepare next track
+ nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
+
// re-compute track parameters using kalman filter if needed
- if (trackModified) RetraceTrack(*track,kTRUE);
+ if (trackModified && !RetraceTrack(*track,kTRUE)) {
+ AliWarning("track modified but problem occur during refitting --> remove track");
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ }
- track = (AliMUONTrack*) fRecTracksPtr->After(track);
+ track = nextTrack;
}
return hasChanged;
/// Improve the given track by removing removable clusters with local chi2 highter than the defined cut
/// Removable clusters are identified by the method AliMUONTrack::TagRemovableClusters()
/// Recompute track parameters and covariances at the remaining clusters
+ /// and if something goes wrong (i.e. extrapolation failed...) set track chi2 to max value
AliDebug(1,"Enter ImproveTrack");
Double_t localChi2, worstLocalChi2;
- AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *nextTrackParam;
+ AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *nextTrackParam, *next2nextTrackParam;
+ Int_t nextChamber, next2nextChamber;
Bool_t smoothed;
Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() *
GetRecoParam()->GetSigmaCutForImprovement();
if (!smoothed) {
// Update track parameters and covariances
- track.UpdateCovTrackParamAtCluster();
+ if (!track.UpdateCovTrackParamAtCluster()) {
+ AliWarning("unable to update track parameters and covariances --> stop improvement");
+ // restore the kalman parameters
+ RetraceTrack(track,kTRUE);
+ break;
+ }
// Compute local chi2 of each clusters
track.ComputeLocalChi2(kTRUE);
// Look for the cluster to remove
worstTrackParamAtCluster = 0x0;
- worstLocalChi2 = 0.;
+ worstLocalChi2 = -1.;
trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->First();
while (trackParamAtCluster) {
trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->After(trackParamAtCluster);
}
- // Check if worst cluster found
- if (!worstTrackParamAtCluster) {
- AliWarning("Bad local chi2 values?");
- break;
- }
-
// Check whether the worst chi2 is under requirement or not
if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2
track.SetImproved(kTRUE);
}
// if the worst cluster is not removable then stop improvement
- if (!worstTrackParamAtCluster->IsRemovable()) break;
+ if (!worstTrackParamAtCluster->IsRemovable()) {
+ // restore the kalman parameters in case they have been lost
+ if (!smoothed) RetraceTrack(track,kTRUE);
+ break;
+ }
// get track parameters at cluster next to the one to be removed
nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(worstTrackParamAtCluster);
// Re-calculate track parameters
// - from the cluster immediately downstream the one suppressed
// - or from the begining - if parameters have been re-computed using the standard method (kalman parameters have been lost)
- // - or if the removed cluster was the last one
- if (smoothed && nextTrackParam) RetracePartialTrack(track,nextTrackParam);
- else RetraceTrack(track,kTRUE);
+ // - or if the removed cluster was used to compute the tracking seed
+ Bool_t normalExtrap;
+ if (smoothed && nextTrackParam) {
+
+ nextChamber = nextTrackParam->GetClusterPtr()->GetChamberId();
+ next2nextTrackParam = nextTrackParam;
+ do {
+
+ next2nextChamber = next2nextTrackParam->GetClusterPtr()->GetChamberId();
+ next2nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(next2nextTrackParam);
+
+ } while (next2nextTrackParam && (next2nextChamber == nextChamber));
+
+ if (next2nextChamber == nextChamber) normalExtrap = RetraceTrack(track,kTRUE);
+ else normalExtrap = RetracePartialTrack(track,nextTrackParam);
+
+ } else normalExtrap = RetraceTrack(track,kTRUE);
+
+ // stop in case of extrapolation problem
+ if (!normalExtrap) {
+ AliWarning("track partially improved but problem occur during refitting --> stop improvement");
+ break;
+ }
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::FinalizeTrack(AliMUONTrack &track)
+Bool_t AliMUONTrackReconstructorK::FinalizeTrack(AliMUONTrack &track)
{
/// Update track parameters and covariances at each attached cluster
/// using smoother if required, if not already done
+ /// return kFALSE if the track cannot be extrapolated uo to the last chamber
AliMUONTrackParam *trackParamAtCluster;
Bool_t smoothed = kFALSE;
// update track parameters (using smoother if required) if not already done
- if (!track.IsImproved()) {
- smoothed = kFALSE;
+ if (track.IsImproved()) smoothed = GetRecoParam()->UseSmoother();
+ else {
if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track);
- if (!smoothed) track.UpdateCovTrackParamAtCluster();
- } else smoothed = GetRecoParam()->UseSmoother();
+ if (!smoothed) {
+ if (track.UpdateCovTrackParamAtCluster()) track.ComputeLocalChi2(kTRUE);
+ else {
+ AliWarning("finalization failed due to extrapolation problem");
+ return kFALSE;
+ }
+ }
+ }
// copy smoothed parameters and covariances if any
if (smoothed) {
}
+ return kTRUE;
+
}
//__________________________________________________________________________
/// re-fit the given track
AliDebug(1,"Enter RefitTrack");
- // check validity of the track
- if (track.GetNClusters() < 3) {
- AliWarning("the track does not contain enough clusters --> unable to refit");
+ // check validity of the track (i.e. at least 2 chambers hit on stations 4 and 5)
+ if (!track.IsValid(0)) {
+ AliWarning("the track is not valid --> unable to refit");
return kFALSE;
}
// re-compute track parameters and covariances using Kalman filter
- RetraceTrack(track,kTRUE);
+ if (!RetraceTrack(track,kTRUE)) {
+ AliWarning("bad track refitting due to extrapolation failure");
+ return kFALSE;
+ }
// Improve the reconstructed tracks if required
track.SetImproved(kFALSE);
if (enableImprovement && GetRecoParam()->ImproveTracks()) ImproveTrack(track);
// Fill AliMUONTrack data members
- FinalizeTrack(track);
-
- return kTRUE;
+ if (track.GetGlobalChi2() < AliMUONTrack::MaxChi2()) return FinalizeTrack(track);
+ else {
+ AliWarning("track not finalized due to extrapolation failure");
+ return kFALSE;
+ }
}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff