/// \endcond
//__________________________________________________________________________
-AliMUONTrackReconstructorK::AliMUONTrackReconstructorK(AliMUONVClusterServer& clusterServer)
- : AliMUONVTrackReconstructor(clusterServer)
+AliMUONTrackReconstructorK::AliMUONTrackReconstructorK(const AliMUONRecoParam* recoParam, AliMUONVClusterServer* clusterServer)
+ : AliMUONVTrackReconstructor(recoParam, clusterServer)
{
/// Constructor
}
{
/// To make track candidates (assuming linear propagation if the flag fgkMakeTrackCandidatesFast is set to kTRUE):
/// Start with segments station(1..) 4 or 5 then follow track in station 5 or 4.
- /// Good candidates are made of at least three clusters.
+ /// Good candidates are made of at least three clusters if both station are requested (two otherwise).
/// Keep only best candidates or all of them according to the flag fgkTrackAllTracks.
TClonesArray *segments;
Int_t firstChamber(0);
Int_t lastChamber(9);
- if (AliMUONReconstructor::GetRecoParam()->CombineClusterTrackReco()) {
+ if (GetRecoParam()->CombineClusterTrackReco()) {
// ... Here's the exception : ask the clustering to reconstruct
// clusters *only* in station 4 and 5 for combined tracking
firstChamber = 6;
for (Int_t i = firstChamber; i <= lastChamber; ++i )
{
- fClusterServer.Clusterize(i, clusterStore, AliMpArea());
+ if (fClusterServer && GetRecoParam()->UseChamber(i)) fClusterServer->Clusterize(i, clusterStore, AliMpArea(), GetRecoParam());
}
// Loop over stations(1..) 5 and 4 and make track candidates
for (Int_t istat=4; istat>=3; istat--) {
// Make segments in the station
- segments = MakeSegmentsInStation(clusterStore, istat);
+ segments = MakeSegmentsBetweenChambers(clusterStore, 2*istat, 2*istat+1);
// Loop over segments
for (Int_t iseg=0; iseg<segments->GetEntriesFast(); iseg++) {
AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate));
// Transform segments to tracks and put them at the end of fRecTracksPtr
- track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack((AliMUONObjectPair*)((*segments)[iseg]));
+ track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack((AliMUONObjectPair*)((*segments)[iseg]),GetRecoParam()->GetBendingVertexDispersion());
fNRecTracks++;
- // Printout for debuging
- if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
- cout<<endl<<"Track parameter covariances at first cluster:"<<endl;
- ((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->First()))->GetCovariances().Print();
- }
-
// Look for compatible cluster(s) in the other station
- if (AliMUONReconstructor::GetRecoParam()->MakeTrackCandidatesFast())
+ if (GetRecoParam()->MakeTrackCandidatesFast())
clusterFound = FollowLinearTrackInStation(*track, clusterStore, 7-istat);
else {
// First recompute track parameters and covariances on station(1..) 5 using Kalman filter
// (to make sure all tracks are treated in the same way)
- if (istat == 4) RetraceTrack(*track, kFALSE);
+ if (istat == 4) RetraceTrack(*track, kTRUE);
clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat);
}
- // Remove track if no cluster found
+ // Remove track if no cluster found on a requested station
if (!clusterFound) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
+ if (GetRecoParam()->RequestStation(7-istat)) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ } else if (istat == 3 && !GetRecoParam()->MakeTrackCandidatesFast()) {
+ // update track parameters and covariances using Kalman filter
+ RetraceTrack(*track, kTRUE);
+ }
}
}
// Retrace tracks using Kalman filter and remove bad ones
- if (AliMUONReconstructor::GetRecoParam()->MakeTrackCandidatesFast()) {
+ if (GetRecoParam()->MakeTrackCandidatesFast()) {
fRecTracksPtr->Compress(); // this is essential before checking tracks
Int_t currentNRecTracks = fNRecTracks;
RetraceTrack(*track,kTRUE);
// Remove the track if the normalized chi2 is too high
- if (track->GetNormalizedChi2() > AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking()) {
+ if (track->GetNormalizedChi2() > GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking()) {
fRecTracksPtr->Remove(track);
fNRecTracks--;
}
fRecTracksPtr->Compress(); // this is essential before checking tracks
// Keep all different tracks or only the best ones as required
- if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks();
+ if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks();
+ else RemoveDoubleTracks();
+
+ AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
+
+}
+
+ //__________________________________________________________________________
+void AliMUONTrackReconstructorK::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore)
+{
+ /// To make extra track candidates (assuming linear propagation if the flag fgkMakeTrackCandidatesFast is set to kTRUE):
+ /// clustering is supposed to be already done
+ /// Start with segments made of 1 cluster in each of the stations 4 and 5 then follow track in remaining chambers.
+ /// Good candidates are made of at least three clusters if both station are requested (two otherwise).
+ /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks.
+
+ TClonesArray *segments;
+ AliMUONTrack *track;
+ Int_t iCandidate = 0, iCurrentTrack, nCurrentTracks;
+ Int_t initialNRecTracks = fNRecTracks;
+ Bool_t clusterFound;
+
+ AliDebug(1,"Enter MakeMoreTrackCandidates");
+
+ // Double loop over chambers in stations(1..) 4 and 5 to make track candidates
+ for (Int_t ich1 = 6; ich1 <= 7; ich1++) {
+ for (Int_t ich2 = 8; ich2 <= 9; ich2++) {
+
+ // Make segments between ch1 and ch2
+ segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2);
+
+ // Loop over segments
+ for (Int_t iseg=0; iseg<segments->GetEntriesFast(); iseg++) {
+ AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate));
+
+ // Transform segments to tracks and put them at the end of fRecTracksPtr
+ iCurrentTrack = fRecTracksPtr->GetLast()+1;
+ track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack((AliMUONObjectPair*)((*segments)[iseg]),GetRecoParam()->GetBendingVertexDispersion());
+ fNRecTracks++;
+
+ // Look for compatible cluster(s) in the second chamber of station 5
+ if (GetRecoParam()->MakeTrackCandidatesFast())
+ clusterFound = FollowLinearTrackInChamber(*track, clusterStore, 17-ich2);
+ else clusterFound = FollowTrackInChamber(*track, clusterStore, 17-ich2);
+
+ // skip the original track in case it has been removed
+ if (GetRecoParam()->TrackAllTracks() && clusterFound) iCurrentTrack++;
+
+ // loop over every new tracks
+ nCurrentTracks = fRecTracksPtr->GetLast()+1;
+ while (iCurrentTrack < nCurrentTracks) {
+ track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iCurrentTrack);
+
+ // Look for compatible cluster(s) in the second chamber of station 4
+ if (GetRecoParam()->MakeTrackCandidatesFast())
+ FollowLinearTrackInChamber(*track, clusterStore, 13-ich1);
+ else FollowTrackInChamber(*track, clusterStore, 13-ich1);
+
+ iCurrentTrack++;
+ }
+
+ }
+
+ // delete the array of segments
+ delete segments;
+ }
+ }
+
+ fRecTracksPtr->Compress(); // this is essential before checking tracks
+
+ // Retrace tracks using Kalman filter
+ for (Int_t iRecTrack = initialNRecTracks; iRecTrack < fNRecTracks; iRecTrack++) {
+ track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
+
+ // Recompute track parameters and covariances using Kalman filter
+ RetraceTrack(*track,kTRUE);
+
+ // Remove the track if the normalized chi2 is too high
+ // (only if the tracking has been done without magnetic field)
+ if (GetRecoParam()->MakeTrackCandidatesFast() &&
+ track->GetNormalizedChi2() > GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking()) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ }
+
+ }
+
+ // this is essential before checking tracks
+ if (GetRecoParam()->MakeTrackCandidatesFast()) fRecTracksPtr->Compress();
+
+ // Keep all different tracks or only the best ones as required
+ if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks();
else RemoveDoubleTracks();
AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
/// Re-run the kalman filter from the most downstream cluster to the most uptream one
AliDebug(1,"Enter RetraceTrack");
- AliMUONTrackParam* startingTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Last();
+ AliMUONTrackParam* lastTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Last();
// Reset the "seed" (= track parameters and their covariances at last cluster) if required
if (resetSeed) {
- // => Shift track parameters at the position of the last cluster
- AliMUONVCluster* cluster = startingTrackParam->GetClusterPtr();
- startingTrackParam->SetNonBendingCoor(cluster->GetX());
- startingTrackParam->SetBendingCoor(cluster->GetY());
-
- // => Re-compute and reset track parameters covariances at last cluster (as if the other clusters did not exist)
- const TMatrixD& kParamCov = startingTrackParam->GetCovariances();
- TMatrixD newParamCov(5,5);
- newParamCov.Zero();
+
+ // parameters at last cluster
+ AliMUONVCluster* cluster2 = lastTrackParam->GetClusterPtr();
+ Double_t x2 = cluster2->GetX();
+ Double_t y2 = cluster2->GetY();
+ Double_t z2 = cluster2->GetZ();
+
+ // parameters at last but one cluster
+ AliMUONTrackParam* previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(lastTrackParam);
+ AliMUONVCluster* cluster1 = previousTrackParam->GetClusterPtr();
+ // make sure it is on the previous chamber (can have 2 clusters in the same chamber after "ComplementTrack")
+ if (cluster2->GetChamberId() == cluster1->GetChamberId()) {
+ previousTrackParam = (AliMUONTrackParam*) trackCandidate.GetTrackParamAtCluster()->Before(previousTrackParam);
+ cluster1 = previousTrackParam->GetClusterPtr();
+ }
+ Double_t x1 = cluster1->GetX();
+ Double_t y1 = cluster1->GetY();
+ Double_t z1 = cluster1->GetZ();
+
+ // reset track parameters
+ Double_t dZ = z1 - z2;
+ lastTrackParam->SetNonBendingCoor(x2);
+ lastTrackParam->SetBendingCoor(y2);
+ lastTrackParam->SetZ(z2);
+ lastTrackParam->SetNonBendingSlope((x1 - x2) / dZ);
+ lastTrackParam->SetBendingSlope((y1 - y2) / dZ);
+ Double_t bendingImpact = y2 - z2 * lastTrackParam->GetBendingSlope();
+ Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact);
+ lastTrackParam->SetInverseBendingMomentum(inverseBendingMomentum);
+
+ // => Reset track parameter covariances at last cluster (as if the other clusters did not exist)
+ TMatrixD lastParamCov(5,5);
+ lastParamCov.Zero();
// Non bending plane
- newParamCov(0,0) = cluster->GetErrX2();
- newParamCov(1,1) = 100.*kParamCov(1,1);
+ lastParamCov(0,0) = cluster2->GetErrX2();
+ lastParamCov(1,1) = 100. * ( cluster1->GetErrX2() + cluster2->GetErrX2() ) / dZ / dZ;
// Bending plane
- newParamCov(2,2) = cluster->GetErrY2();
- newParamCov(3,3) = 100.*kParamCov(3,3);
- // Inverse bending momentum
- newParamCov(4,4) = 0.5*startingTrackParam->GetInverseBendingMomentum() * 0.5*startingTrackParam->GetInverseBendingMomentum();
- startingTrackParam->SetCovariances(newParamCov);
+ lastParamCov(2,2) = cluster2->GetErrY2();
+ lastParamCov(3,3) = 100. * ( cluster1->GetErrY2() + cluster2->GetErrY2() ) / dZ / dZ;
+ // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
+ lastParamCov(4,4) = ((GetRecoParam()->GetBendingVertexDispersion() *
+ GetRecoParam()->GetBendingVertexDispersion() +
+ (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ) /
+ bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum;
+ lastTrackParam->SetCovariances(lastParamCov);
// Reset the track chi2
- startingTrackParam->SetTrackChi2(0.);
+ lastTrackParam->SetTrackChi2(0.);
}
// Redo the tracking
- RetracePartialTrack(trackCandidate, startingTrackParam);
+ RetracePartialTrack(trackCandidate, lastTrackParam);
}
AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.);
// reset propagator for smoother
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) trackParamAtCluster->ResetPropagator();
+ if (GetRecoParam()->UseSmoother()) trackParamAtCluster->ResetPropagator();
- // add MCS in missing chambers if any (at most 2 chambers can be missing according to tracking criteria)
+ // add MCS in missing chambers if any
currentChamber = trackParamAtCluster->GetClusterPtr()->GetChamberId();
while (currentChamber < expectedChamber) {
// extrapolation to the missing chamber (update the propagator)
AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, AliMUONConstants::DefaultChamberZ(expectedChamber),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
// add MCS effect
AliMUONTrackExtrap::AddMCSEffect(trackParamAtCluster,AliMUONConstants::ChamberThicknessInX0(),1.);
expectedChamber--;
// extrapolation to the plane of the cluster attached to the current trackParamAtCluster (update the propagator)
AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) {
+ if (GetRecoParam()->UseSmoother()) {
// save extrapolated parameters for smoother
trackParamAtCluster->SetExtrapParameters(trackParamAtCluster->GetParameters());
trackParamAtCluster->SetExtrapCovariances(trackParamAtCluster->GetCovariances());
}
- // Compute new track parameters including "clusterCh2" using kalman filter
+ // Compute new track parameters using kalman filter
addChi2TrackAtCluster = RunKalmanFilter(*trackParamAtCluster);
// Update the track chi2
AliMUONTrack *track;
Int_t currentNRecTracks;
- Bool_t clusterFound;
for (Int_t station = 2; station >= 0; station--) {
track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
+ // Look for compatible cluster(s) in station(0..) "station"
+ if (!FollowTrackInStation(*track, clusterStore, station)) {
+
+ // Try to recover track if required
+ if (GetRecoParam()->RecoverTracks()) {
+
+ // work on a copy of the track if this station is not required
+ // to keep the case where no cluster is reconstructed as a possible candidate
+ if (!GetRecoParam()->RequestStation(station)) {
+ track = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(*track);
+ fNRecTracks++;
+ }
+
+ // try to recover
+ if (!RecoverTrack(*track, clusterStore, station)) {
+ // remove track if no cluster found
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ }
+
+ } else if (GetRecoParam()->RequestStation(station)) {
+ // remove track if no cluster found
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ }
+
+ }
+
+ }
+
+ fRecTracksPtr->Compress(); // this is essential before checking tracks
+
+ // Keep only the best tracks if required
+ if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
+
+ }
+
+}
+
+ //__________________________________________________________________________
+Bool_t AliMUONTrackReconstructorK::FollowTrackInChamber(AliMUONTrack &trackCandidate, AliMUONVClusterStore& clusterStore, Int_t nextChamber)
+{
+ /// Follow trackCandidate in chamber(0..) nextChamber and search for compatible cluster(s)
+ /// Keep all possibilities or only the best one(s) according to the flag fgkTrackAllTracks:
+ /// kTRUE: duplicate "trackCandidate" if there are several possibilities and add the new tracks at the end of
+ /// fRecTracksPtr to avoid conficts with other track candidates at this current stage of the tracking procedure.
+ /// Remove the obsolete "trackCandidate" at the end.
+ /// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
+ /// return kTRUE if new cluster(s) have been found (otherwise return kFALSE)
+ AliDebug(1,Form("Enter FollowTrackInChamber(1..) %d", nextChamber+1));
+
+ Double_t bendingMomentum;
+ Double_t chi2OfCluster;
+ Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
+ Double_t addChi2TrackAtCluster;
+ Double_t bestAddChi2TrackAtCluster = 1.e10;
+ Bool_t foundOneCluster = kFALSE;
+ AliMUONTrack *newTrack = 0x0;
+ AliMUONVCluster *cluster;
+ AliMUONTrackParam extrapTrackParamAtCh;
+ AliMUONTrackParam extrapTrackParamAtCluster;
+ AliMUONTrackParam bestTrackParamAtCluster;
+
+ // Get track parameters according to the propagation direction
+ if (nextChamber > 7) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
+ else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
+ extrapTrackParamAtCh.GetParameters().Print();
+ extrapTrackParamAtCh.GetCovariances().Print();
+ }
+
+ // Add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),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());
+ // add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ }
+
+ //Extrapolate trackCandidate to chamber
+ AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber),
+ GetRecoParam()->UseSmoother());
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(nextChamber)<<":"<<endl;
+ extrapTrackParamAtCh.GetParameters().Print();
+ extrapTrackParamAtCh.GetCovariances().Print();
+ }
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInChamber: look for clusters in chamber(1..): " << nextChamber+1 << endl;
+ }
+
+ // Ask the clustering to reconstruct new clusters around the track position in the current chamber
+ // except for station 4 and 5 that are already entirely clusterized
+ if (GetRecoParam()->CombineClusterTrackReco()) {
+ if (nextChamber < 6) AskForNewClustersInChamber(extrapTrackParamAtCh, clusterStore, nextChamber);
+ }
+
+ // Create iterators to loop over clusters in both chambers
+ TIter next(clusterStore.CreateChamberIterator(nextChamber,nextChamber));
+
+ // look for candidates in chamber
+ while ( ( cluster = static_cast<AliMUONVCluster*>(next()) ) ) {
+
+ // try to add the current cluster fast
+ if (!TryOneClusterFast(extrapTrackParamAtCh, cluster)) continue;
+
+ // try to add the current cluster accuratly
+ chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, cluster, extrapTrackParamAtCluster,
+ GetRecoParam()->UseSmoother());
+
+ // if good chi2 then consider to add cluster
+ if (chi2OfCluster < maxChi2OfCluster) {
+ foundOneCluster = kTRUE;
+
// Printout for debuging
- if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
- cout<<endl<<"Track parameter covariances at first cluster:"<<endl;
- ((AliMUONTrackParam*) (track->GetTrackParamAtCluster()->First()))->GetCovariances().Print();
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
+ << " (Chi2 = " << chi2OfCluster << ")" << endl;
+ cluster->Print();
}
- // Look for compatible cluster(s) in station(0..) "station"
- clusterFound = FollowTrackInStation(*track, clusterStore, station);
+ if (GetRecoParam()->UseSmoother()) {
+ // save extrapolated parameters for smoother
+ extrapTrackParamAtCluster.SetExtrapParameters(extrapTrackParamAtCluster.GetParameters());
+
+ // save extrapolated covariance matrix for smoother
+ extrapTrackParamAtCluster.SetExtrapCovariances(extrapTrackParamAtCluster.GetCovariances());
+ }
- // Try to recover track if required
- if (!clusterFound && AliMUONReconstructor::GetRecoParam()->RecoverTracks())
- clusterFound = RecoverTrack(*track, clusterStore, station);
+ // Compute new track parameters including new cluster using kalman filter
+ addChi2TrackAtCluster = RunKalmanFilter(extrapTrackParamAtCluster);
- // remove track if no cluster found
- if (!clusterFound) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
+ // skip track with absolute bending momentum out of limits
+ bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster.GetInverseBendingMomentum());
+ if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
+ bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
+
+ if (GetRecoParam()->TrackAllTracks()) {
+ // copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
+ newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
+ UpdateTrack(*newTrack,extrapTrackParamAtCluster,addChi2TrackAtCluster);
+ fNRecTracks++;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInChamber: added one cluster in chamber(1..): " << nextChamber+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else if (addChi2TrackAtCluster < bestAddChi2TrackAtCluster) {
+ // keep track of the best cluster
+ bestAddChi2TrackAtCluster = addChi2TrackAtCluster;
+ bestTrackParamAtCluster = extrapTrackParamAtCluster;
}
}
- fRecTracksPtr->Compress(); // this is essential before checking tracks
+ }
+
+ // fill out the best track if required else clean up the fRecTracksPtr array
+ if (!GetRecoParam()->TrackAllTracks()) {
+ if (foundOneCluster) {
+ UpdateTrack(trackCandidate,bestTrackParamAtCluster,bestAddChi2TrackAtCluster);
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInChamber: added the best cluster in chamber(1..): " << bestTrackParamAtCluster.GetClusterPtr()->GetChamberId()+1 << endl;
+ if (AliLog::GetGlobalDebugLevel() >= 3) newTrack->RecursiveDump();
+ }
+
+ } else return kFALSE;
- // Keep only the best tracks if required
- if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
+ } else if (foundOneCluster) {
- }
+ // remove obsolete track
+ fRecTracksPtr->Remove(&trackCandidate);
+ fNRecTracks--;
+
+ } else return kFALSE;
+
+ return kTRUE;
}
ch2 = 2*nextStation+1;
}
+ Double_t bendingMomentum;
Double_t chi2OfCluster;
- Double_t maxChi2OfCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
+ Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
Double_t addChi2TrackAtCluster1;
Double_t addChi2TrackAtCluster2;
Double_t bestAddChi2TrackAtCluster1 = 1.e10;
AliMUONTrack *newTrack = 0x0;
AliMUONVCluster *clusterCh1, *clusterCh2;
AliMUONTrackParam extrapTrackParam;
+ AliMUONTrackParam extrapTrackParamAtCh;
AliMUONTrackParam extrapTrackParamAtCluster1;
AliMUONTrackParam extrapTrackParamAtCluster2;
AliMUONTrackParam bestTrackParamAtCluster1;
for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
Int_t iCluster1;
- // Get track parameters
- AliMUONTrackParam extrapTrackParamAtCh(*(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First());
+ // Get track parameters according to the propagation direction
+
+ if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
+ else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameters and covariances at first cluster:"<<endl;
+ extrapTrackParamAtCh.GetParameters().Print();
+ extrapTrackParamAtCh.GetCovariances().Print();
+ }
// Add MCS effect
AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
// reset propagator for smoother
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator();
+ if (GetRecoParam()->UseSmoother()) extrapTrackParamAtCh.ResetPropagator();
- // Add MCS in the missing chamber if any (only 1 chamber can be missing according to tracking criteria)
- if (ch1 < ch2 && extrapTrackParamAtCh.GetClusterPtr()->GetChamberId() > ch2 + 1) {
+ // 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
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2 + 1),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ currentChamber--;
+ AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber),
+ GetRecoParam()->UseSmoother());
// add MCS effect
AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
}
//Extrapolate trackCandidate to chamber "ch2"
AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
- cout<<endl<<"Track parameter covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl;
+ cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch2)<<":"<<endl;
+ extrapTrackParamAtCh.GetParameters().Print();
extrapTrackParamAtCh.GetCovariances().Print();
}
// Ask the clustering to reconstruct new clusters around the track position in the current station
// except for station 4 and 5 that are already entirely clusterized
- if (AliMUONReconstructor::GetRecoParam()->CombineClusterTrackReco()) {
+ if (GetRecoParam()->CombineClusterTrackReco()) {
if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation);
}
// try to add the current cluster accuratly
chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh2, extrapTrackParamAtCluster2,
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
// if good chi2 then try to attach a cluster in the other chamber too
if (chi2OfCluster < maxChi2OfCluster) {
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch2+1
<< " (Chi2 = " << chi2OfCluster << ")" << endl;
+ clusterCh2->Print();
cout << " look for second clusters in chamber(1..): " << ch1+1 << " ..." << endl;
}
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) {
+ if (GetRecoParam()->UseSmoother()) {
// save extrapolated parameters for smoother
extrapTrackParamAtCluster2.SetExtrapParameters(extrapTrackParamAtCluster2.GetParameters());
// Compute new track parameters including "clusterCh2" using kalman filter
addChi2TrackAtCluster2 = RunKalmanFilter(extrapTrackParamAtCluster2);
+ // skip track with absolute bending momentum out of limits
+ bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster2.GetInverseBendingMomentum());
+ if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
+ bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
+
// copy new track parameters for next step
extrapTrackParam = extrapTrackParamAtCluster2;
AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
// reset propagator for smoother
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) extrapTrackParam.ResetPropagator();
+ if (GetRecoParam()->UseSmoother()) extrapTrackParam.ResetPropagator();
//Extrapolate track parameters to chamber "ch1"
AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
// reset cluster iterator of chamber 1
nextInCh1.Reset();
// try to add the current cluster accuratly
chi2OfCluster = TryOneCluster(extrapTrackParam, clusterCh1, extrapTrackParamAtCluster1,
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
// if good chi2 then consider to add the 2 clusters to the "trackCandidate"
if (chi2OfCluster < maxChi2OfCluster) {
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1
- << " (Chi2 = " << chi2OfCluster << ")" << endl;
+ << " (Chi2 = " << chi2OfCluster << ")" << endl;
+ clusterCh1->Print();
}
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) {
+ if (GetRecoParam()->UseSmoother()) {
// save extrapolated parameters for smoother
extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters());
// Compute new track parameters including "clusterCh1" using kalman filter
addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1);
- if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
+ // skip track with absolute bending momentum out of limits
+ bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster1.GetInverseBendingMomentum());
+ if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
+ bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
+
+ if (GetRecoParam()->TrackAllTracks()) {
// copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new clusters
newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
UpdateTrack(*newTrack,extrapTrackParamAtCluster1,extrapTrackParamAtCluster2,addChi2TrackAtCluster1,addChi2TrackAtCluster2);
if (!foundSecondCluster) {
foundOneCluster = kTRUE;
- if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
+ if (GetRecoParam()->TrackAllTracks()) {
// copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
UpdateTrack(*newTrack,extrapTrackParamAtCluster2,addChi2TrackAtCluster2);
// look for candidates in chamber 1 not already attached to a track
// if we want to keep all possible tracks or if no good couple of clusters has been found
- if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
-
- // Printout for debuging
- if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
- cout << "FollowTrackInStation: look for single clusters in chamber(1..): " << ch1+1 << endl;
- }
+ if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
// add MCS effect for next step
AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
//Extrapolate trackCandidate to chamber "ch1"
AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameters and covariances at first cluster extrapolated to z = "<<AliMUONConstants::DefaultChamberZ(ch1)<<":"<<endl;
+ extrapTrackParamAtCh.GetParameters().Print();
+ extrapTrackParamAtCh.GetCovariances().Print();
+ }
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInStation: look for single clusters in chamber(1..): " << ch1+1 << endl;
+ }
// reset cluster iterator of chamber 1
nextInCh1.Reset();
// try to add the current cluster accuratly
chi2OfCluster = TryOneCluster(extrapTrackParamAtCh, clusterCh1, extrapTrackParamAtCluster1,
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ GetRecoParam()->UseSmoother());
// if good chi2 then consider to add clusterCh1
// We do not try to attach a cluster in the other chamber too since it has already been done above
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch1+1
<< " (Chi2 = " << chi2OfCluster << ")" << endl;
+ clusterCh1->Print();
}
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) {
+ if (GetRecoParam()->UseSmoother()) {
// save extrapolated parameters for smoother
extrapTrackParamAtCluster1.SetExtrapParameters(extrapTrackParamAtCluster1.GetParameters());
// Compute new track parameters including "clusterCh1" using kalman filter
addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1);
- if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
+ // skip track with absolute bending momentum out of limits
+ bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster1.GetInverseBendingMomentum());
+ if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
+ bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
+
+ if (GetRecoParam()->TrackAllTracks()) {
// copy trackCandidate into a new track put at the end of fRecTracksPtr and add the new cluster
newTrack = new ((*fRecTracksPtr)[fRecTracksPtr->GetLast()+1]) AliMUONTrack(trackCandidate);
UpdateTrack(*newTrack,extrapTrackParamAtCluster1,addChi2TrackAtCluster1);
}
// fill out the best track if required else clean up the fRecTracksPtr array
- if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) {
+ if (!GetRecoParam()->TrackAllTracks()) {
if (foundTwoClusters) {
UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestTrackParamAtCluster2,bestAddChi2TrackAtCluster1,bestAddChi2TrackAtCluster2);
// if we are arrived on station(1..) 5, recompute track parameters and covariances starting from this station
// (going in the right direction)
if (nextStation == 4) RetraceTrack(trackCandidate,kTRUE);
-
+
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: added the two best clusters in station(1..): " << nextStation+1 << endl;
// if we are arrived on station(1..) 5, recompute track parameters and covariances starting from this station
// (going in the right direction)
if (nextStation == 4) RetraceTrack(trackCandidate,kTRUE);
-
+
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: added the best cluster in chamber(1..): " << bestTrackParamAtCluster1.GetClusterPtr()->GetChamberId()+1 << endl;
delete [] clusterCh1Used;
return kFALSE;
}
+
} else if (foundOneCluster || foundTwoClusters) {
// remove obsolete track
} else {
delete [] clusterCh1Used;
return kFALSE;
- }
+ }
+
delete [] clusterCh1Used;
return kTRUE;
/// Add 1 cluster to the track candidate
/// Update chi2 of the track
- // Flag cluster as being not removable
- trackParamAtCluster.SetRemovable(kFALSE);
+ // Flag cluster as being (not) removable
+ if (GetRecoParam()->RequestStation(trackParamAtCluster.GetClusterPtr()->GetChamberId()/2))
+ trackParamAtCluster.SetRemovable(kFALSE);
+ else trackParamAtCluster.SetRemovable(kTRUE);
trackParamAtCluster.SetLocalChi2(0.); // --> Local chi2 not used
// Update the track chi2 into trackParamAtCluster
// Update array of TrackParamAtCluster
track.AddTrackParamAtCluster(trackParamAtCluster,*(trackParamAtCluster.GetClusterPtr()));
- track.GetTrackParamAtCluster()->Sort();
}
// Update array of trackParamAtCluster
track.AddTrackParamAtCluster(trackParamAtCluster1,*cluster1);
track.AddTrackParamAtCluster(trackParamAtCluster2,*cluster2);
- track.GetTrackParamAtCluster()->Sort();
}
if (nextStation > 1) return kFALSE;
Int_t worstClusterNumber = -1;
- Double_t localChi2, worstLocalChi2 = 0.;
+ Double_t localChi2, worstLocalChi2 = -1.;
// Look for the cluster to remove
for (Int_t clusterNumber = 0; clusterNumber < 2; clusterNumber++) {
AliMUONTrackParam *trackParamAtCluster = (AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(clusterNumber);
+ // check if current cluster is in the previous station
+ if (trackParamAtCluster->GetClusterPtr()->GetChamberId()/2 != nextStation+1) break;
+
// check if current cluster is removable
if (!trackParamAtCluster->IsRemovable()) return kFALSE;
+ // reset the current cluster as being not removable if it is on a required station
+ if (GetRecoParam()->RequestStation(nextStation+1)) trackParamAtCluster->SetRemovable(kFALSE);
+
// Pick up cluster with the worst chi2
localChi2 = trackParamAtCluster->GetLocalChi2();
if (localChi2 > worstLocalChi2) {
}
}
- // Reset best cluster as being NOT removable
- ((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt((worstClusterNumber+1)%2))->SetRemovable(kFALSE);
+ // check if worst cluster found
+ if (worstClusterNumber < 0) return kFALSE;
// Remove the worst cluster
trackCandidate.RemoveTrackParamAtCluster((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(worstClusterNumber));
// Re-calculate track parameters at the (new) first cluster
RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1));
+ // skip track with absolute bending momentum out of limits
+ Double_t bendingMomentum = TMath::Abs(1. / ((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First())->GetInverseBendingMomentum());
+ if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
+ bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) return kFALSE;
+
// Look for new cluster(s) in next station
return FollowTrackInStation(trackCandidate, clusterStore, nextStation);
AliMUONVCluster *cluster = previousTrackParam->GetClusterPtr();
Double_t dX = cluster->GetX() - previousTrackParam->GetNonBendingCoor();
Double_t dY = cluster->GetY() - previousTrackParam->GetBendingCoor();
- Double_t localChi2 = dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2();
+ Double_t chi2 = dX * dX / cluster->GetErrX2() + dY * dY / cluster->GetErrY2();
// Save local chi2 at first cluster
- previousTrackParam->SetLocalChi2(localChi2);
+ previousTrackParam->SetLocalChi2(chi2);
AliMUONTrackParam *currentTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(previousTrackParam);
while (currentTrackParam) {
Int_t chamberId, detElemId;
Double_t chi2OfCluster, addChi2TrackAtCluster, bestAddChi2TrackAtCluster;
- Double_t maxChi2OfCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
+ Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
Bool_t foundOneCluster, trackModified;
AliMUONVCluster *cluster;
AliMUONTrackParam *trackParam, *previousTrackParam, *nextTrackParam, trackParamAtCluster, bestTrackParamAtCluster;
- // Remove double track to complete only "good" tracks
- RemoveDoubleTracks();
-
AliMUONTrack *track = (AliMUONTrack*) fRecTracksPtr->First();
while (track) {
trackModified = kFALSE;
// add new cluster if any
if (foundOneCluster) {
- UpdateTrack(*track,bestTrackParamAtCluster,bestAddChi2TrackAtCluster);
- bestTrackParamAtCluster.SetAloneInChamber(kFALSE);
- trackParam->SetAloneInChamber(kFALSE);
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "ComplementTracks: found one cluster in chamber(1..): " << chamberId+1 << endl;
+ bestTrackParamAtCluster.GetClusterPtr()->Print();
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
+ cout<<endl<<"Track parameters and covariances at cluster:"<<endl;
+ bestTrackParamAtCluster.GetParameters().Print();
+ bestTrackParamAtCluster.GetCovariances().Print();
+ }
+ }
+
+ trackParam->SetRemovable(kTRUE);
+ bestTrackParamAtCluster.SetRemovable(kTRUE);
+ track->AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
trackModified = kTRUE;
}
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::ImproveTracks()
+void AliMUONTrackReconstructorK::ImproveTrack(AliMUONTrack &track)
{
- /// Improve tracks by removing clusters with local chi2 highter than the defined cut
+ /// 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
- AliDebug(1,"Enter ImproveTracks");
+ AliDebug(1,"Enter ImproveTrack");
Double_t localChi2, worstLocalChi2;
- Int_t worstChamber, previousChamber;
- AliMUONTrack *track, *nextTrack;
- AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *previousTrackParam, *nextTrackParam;
+ AliMUONTrackParam *trackParamAtCluster, *worstTrackParamAtCluster, *nextTrackParam;
Bool_t smoothed;
- Double_t sigmaCut2 = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForImprovement() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForImprovement();
-
- // Remove double track to improve only "good" tracks
- RemoveDoubleTracks();
+ Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() *
+ GetRecoParam()->GetSigmaCutForImprovement();
- track = (AliMUONTrack*) fRecTracksPtr->First();
- while (track) {
+ while (!track.IsImproved()) {
- // prepare next track in case the actual track is suppressed
- nextTrack = (AliMUONTrack*) fRecTracksPtr->After(track);
+ // identify removable clusters
+ track.TagRemovableClusters(GetRecoParam()->RequestedStationMask());
- while (!track->IsImproved()) {
-
- // Run smoother if required
- smoothed = kFALSE;
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) smoothed = RunSmoother(*track);
-
- // Use standard procedure to compute local chi2 if smoother not required or not working
- if (!smoothed) {
-
- // Update track parameters and covariances
- track->UpdateCovTrackParamAtCluster();
-
- // Compute local chi2 of each clusters
- track->ComputeLocalChi2(kTRUE);
- }
-
- // Look for the cluster to remove
- worstTrackParamAtCluster = NULL;
- worstLocalChi2 = 0.;
- trackParamAtCluster = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First();
- while (trackParamAtCluster) {
-
- // save parameters into smooth parameters in case of smoother did not work properly
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother() && !smoothed) {
- trackParamAtCluster->SetSmoothParameters(trackParamAtCluster->GetParameters());
- trackParamAtCluster->SetSmoothCovariances(trackParamAtCluster->GetCovariances());
- }
-
- // Pick up cluster with the worst chi2
- localChi2 = trackParamAtCluster->GetLocalChi2();
- if (localChi2 > worstLocalChi2) {
- worstLocalChi2 = localChi2;
- worstTrackParamAtCluster = trackParamAtCluster;
- }
-
- trackParamAtCluster = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->After(trackParamAtCluster);
- }
-
- // Check if bad removable cluster found
- if (!worstTrackParamAtCluster) {
- track->SetImproved(kTRUE);
- break;
- }
+ // Run smoother if required
+ smoothed = kFALSE;
+ if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track);
+
+ // Use standard procedure to compute local chi2 if smoother not required or not working
+ if (!smoothed) {
- // Check whether the worst chi2 is under requirement or not
- if (worstLocalChi2 < 2. * sigmaCut2) { // 2 because 2 quantities in chi2
- track->SetImproved(kTRUE);
- break;
- }
+ // Update track parameters and covariances
+ track.UpdateCovTrackParamAtCluster();
- // if the worst cluster is not removable then remove the entire track
- if (!worstTrackParamAtCluster->IsRemovable() && worstTrackParamAtCluster->IsAloneInChamber()) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- break;
- }
+ // Compute local chi2 of each clusters
+ track.ComputeLocalChi2(kTRUE);
+ }
+
+ // Look for the cluster to remove
+ worstTrackParamAtCluster = 0x0;
+ worstLocalChi2 = 0.;
+ trackParamAtCluster = (AliMUONTrackParam*)track.GetTrackParamAtCluster()->First();
+ while (trackParamAtCluster) {
- // Reset the second cluster in the same station as being not removable
- // or reset the second cluster in the same chamber as being alone
- worstChamber = worstTrackParamAtCluster->GetClusterPtr()->GetChamberId();
- previousTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->Before(worstTrackParamAtCluster);
- nextTrackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->After(worstTrackParamAtCluster);
- if (worstTrackParamAtCluster->IsAloneInChamber()) { // Worst cluster removable and alone in chamber
-
- if (worstChamber%2 == 0) { // Modify flags in next chamber
-
- nextTrackParam->SetRemovable(kFALSE);
- if (!nextTrackParam->IsAloneInChamber()) // Make sure both clusters in second chamber are not removable anymore
- ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->After(nextTrackParam))->SetRemovable(kFALSE);
-
- } else { // Modify flags in previous chamber
-
- previousTrackParam->SetRemovable(kFALSE);
- if (!previousTrackParam->IsAloneInChamber()) // Make sure both clusters in second chamber are not removable anymore
- ((AliMUONTrackParam*) track->GetTrackParamAtCluster()->Before(previousTrackParam))->SetRemovable(kFALSE);
-
- }
-
- } else { // Worst cluster not alone in its chamber
-
- if (previousTrackParam) previousChamber = previousTrackParam->GetClusterPtr()->GetChamberId();
- else previousChamber = -1;
-
- if (previousChamber == worstChamber) { // the second cluster on the same chamber is the previous one
-
- previousTrackParam->SetAloneInChamber(kTRUE);
- // transfert the removability to the second cluster
- if (worstTrackParamAtCluster->IsRemovable()) previousTrackParam->SetRemovable(kTRUE);
-
- } else { // the second cluster on the same chamber is the next one
-
- nextTrackParam->SetAloneInChamber(kTRUE);
- // transfert the removability to the second cluster
- if (worstTrackParamAtCluster->IsRemovable()) nextTrackParam->SetRemovable(kTRUE);
-
- }
-
+ // save parameters into smooth parameters in case of smoother did not work properly
+ if (GetRecoParam()->UseSmoother() && !smoothed) {
+ trackParamAtCluster->SetSmoothParameters(trackParamAtCluster->GetParameters());
+ trackParamAtCluster->SetSmoothCovariances(trackParamAtCluster->GetCovariances());
}
- // Remove the worst cluster
- track->RemoveTrackParamAtCluster(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);
-
- // Printout for debuging
- if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
- cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(track)+1 << " improved " << endl;
+ // Pick up cluster with the worst chi2
+ localChi2 = trackParamAtCluster->GetLocalChi2();
+ if (localChi2 > worstLocalChi2) {
+ worstLocalChi2 = localChi2;
+ worstTrackParamAtCluster = 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);
+ break;
+ }
+
+ // if the worst cluster is not removable then stop improvement
+ if (!worstTrackParamAtCluster->IsRemovable()) break;
+
+ // get track parameters at cluster next to the one to be removed
+ nextTrackParam = (AliMUONTrackParam*) track.GetTrackParamAtCluster()->After(worstTrackParamAtCluster);
+
+ // Remove the worst cluster
+ track.RemoveTrackParamAtCluster(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);
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "ImproveTracks: track " << fRecTracksPtr->IndexOf(&track)+1 << " improved " << endl;
}
- track = nextTrack;
}
- // compress the array in case of some tracks have been removed
- fRecTracksPtr->Compress();
-
}
- //__________________________________________________________________________
-void AliMUONTrackReconstructorK::Finalize()
+//__________________________________________________________________________
+void AliMUONTrackReconstructorK::FinalizeTrack(AliMUONTrack &track)
{
/// Update track parameters and covariances at each attached cluster
+ /// using smoother if required, if not already done
- AliMUONTrack *track;
AliMUONTrackParam *trackParamAtCluster;
Bool_t smoothed = kFALSE;
- track = (AliMUONTrack*) fRecTracksPtr->First();
- while (track) {
-
- // update track parameters (using smoother if required) if not already done
- if (!track->IsImproved()) {
- smoothed = kFALSE;
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) smoothed = RunSmoother(*track);
- if (!smoothed) track->UpdateCovTrackParamAtCluster();
- } else smoothed = AliMUONReconstructor::GetRecoParam()->UseSmoother();
+ // update track parameters (using smoother if required) if not already done
+ if (!track.IsImproved()) {
+ smoothed = kFALSE;
+ if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track);
+ if (!smoothed) track.UpdateCovTrackParamAtCluster();
+ } else smoothed = GetRecoParam()->UseSmoother();
+
+ // copy smoothed parameters and covariances if any
+ if (smoothed) {
- // copy smoothed parameters and covariances if any
- if (smoothed) {
+ trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->First());
+ while (trackParamAtCluster) {
- trackParamAtCluster = (AliMUONTrackParam*) (track->GetTrackParamAtCluster()->First());
- while (trackParamAtCluster) {
-
- trackParamAtCluster->SetParameters(trackParamAtCluster->GetSmoothParameters());
- trackParamAtCluster->SetCovariances(trackParamAtCluster->GetSmoothCovariances());
-
- trackParamAtCluster = (AliMUONTrackParam*) (track->GetTrackParamAtCluster()->After(trackParamAtCluster));
- }
+ trackParamAtCluster->SetParameters(trackParamAtCluster->GetSmoothParameters());
+ trackParamAtCluster->SetCovariances(trackParamAtCluster->GetSmoothCovariances());
+ trackParamAtCluster = (AliMUONTrackParam*) (track.GetTrackParamAtCluster()->After(trackParamAtCluster));
}
- track = (AliMUONTrack*) fRecTracksPtr->After(track);
}
-
+
+}
+
+ //__________________________________________________________________________
+Bool_t AliMUONTrackReconstructorK::RefitTrack(AliMUONTrack &track, Bool_t enableImprovement)
+{
+ /// re-fit the given track
+
+ // check validity of the track
+ if (track.GetNClusters() < 3) {
+ AliWarning("the track does not contain enough clusters --> unable to refit");
+ return kFALSE;
+ }
+
+ // re-compute track parameters and covariances using Kalman filter
+ RetraceTrack(track,kTRUE);
+
+ // Improve the reconstructed tracks if required
+ track.SetImproved(kFALSE);
+ if (enableImprovement && GetRecoParam()->ImproveTracks()) ImproveTrack(track);
+
+ // Fill AliMUONTrack data members
+ FinalizeTrack(track);
+
+ return kTRUE;
+
}