#include "AliMUONTrack.h"
#include "AliMUONTrackParam.h"
#include "AliMUONTrackExtrap.h"
+#include "AliMUONRecoParam.h"
+#include "AliMUONGeometryTransformer.h"
#include "AliMpArea.h"
#include <Riostream.h>
#include <TMath.h>
#include <TMatrixD.h>
+#include <TClonesArray.h>
+using std::endl;
+using std::cout;
/// \cond CLASSIMP
ClassImp(AliMUONTrackReconstructorK) // Class implementation in ROOT context
/// \endcond
//__________________________________________________________________________
-AliMUONTrackReconstructorK::AliMUONTrackReconstructorK(AliMUONVClusterServer& clusterServer)
- : AliMUONVTrackReconstructor(clusterServer)
+AliMUONTrackReconstructorK::AliMUONTrackReconstructorK(const AliMUONRecoParam* recoParam, AliMUONVClusterServer* clusterServer,
+ const AliMUONGeometryTransformer* transformer)
+ : AliMUONVTrackReconstructor(recoParam, clusterServer, transformer)
{
/// Constructor
}
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::MakeTrackCandidates(AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructorK::MakeTrackCandidates(AliMUONVClusterStore& clusterStore)
{
- /// To make track candidates (assuming linear propagation if the flag fgkMakeTrackCandidatesFast is set to kTRUE):
+ /// To make track candidates (assuming linear propagation if AliMUONRecoParam::MakeTrackCandidatesFast() return 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.
- /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks.
+ /// Good candidates are made of at least three clusters if both stations are requested (two otherwise).
+ /// Keep only best candidates or all of them according to the flag AliMUONRecoParam::TrackAllTracks().
TClonesArray *segments;
+ AliMUONObjectPair *segment;
AliMUONTrack *track;
Int_t iCandidate = 0;
Bool_t clusterFound;
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++) {
+ for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) {
AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate));
+ segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment);
// 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(segment,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())
- 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);
- clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat);
- }
+ if (GetRecoParam()->MakeTrackCandidatesFast()) clusterFound = FollowLinearTrackInStation(*track, clusterStore, 7-istat);
+ else clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat);
- // Remove track if no cluster found
- if (!clusterFound) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
+ // Remove track if no cluster found on a requested station
+ // or abort tracking if there are too many candidates
+ if (GetRecoParam()->RequestStation(7-istat)) {
+ if (!clusterFound) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks));
+ return kFALSE;
+ }
+ } else {
+ if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
+ return kFALSE;
+ }
}
}
- // delete the array of segments
- delete segments;
+
}
+ // Keep all different tracks if required
+ if (GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks();
- // Retrace tracks using Kalman filter and remove bad ones
- if (AliMUONReconstructor::GetRecoParam()->MakeTrackCandidatesFast()) {
- fRecTracksPtr->Compress(); // this is essential before checking tracks
+ // Retrace tracks using Kalman filter and select them if needed
+ Int_t nCurrentTracks = fRecTracksPtr->GetLast()+1;
+ for (Int_t iRecTrack = 0; iRecTrack < nCurrentTracks; iRecTrack++) {
+ track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
- Int_t currentNRecTracks = fNRecTracks;
- for (Int_t iRecTrack = 0; iRecTrack < currentNRecTracks; iRecTrack++) {
- track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
+ // skip empty slots
+ if(!track) continue;
+
+ // 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 fRecTracksPtr->Compress();
+
+ AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
+
+ return kTRUE;
+
+}
+
+ //__________________________________________________________________________
+Bool_t AliMUONTrackReconstructorK::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore)
+{
+ /// To make extra track candidates assuming linear propagation:
+ /// 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 stations are requested (two otherwise).
+ /// Keep only best candidates or all of them according to the flag fgkTrackAllTracks.
+
+ TClonesArray *segments;
+ AliMUONObjectPair *segment;
+ 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++) {
- // Recompute track parameters and covariances using Kalman filter
- RetraceTrack(*track,kTRUE);
+ // Make segments between ch1 and ch2
+ segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2);
- // Remove the track if the normalized chi2 is too high
- if (track->GetNormalizedChi2() > AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking()) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
+ /// Remove segments already attached to a track
+ RemoveUsedSegments(*segments);
+
+ // Loop over segments
+ for (Int_t iSegment=0; iSegment<segments->GetEntriesFast(); iSegment++) {
+ AliDebug(1,Form("Making primary candidate(1..) %d",++iCandidate));
+ segment = (AliMUONObjectPair*) segments->UncheckedAt(iSegment);
+
+ // Transform segments to tracks and put them at the end of fRecTracksPtr
+ iCurrentTrack = fRecTracksPtr->GetLast()+1;
+ track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack(segment,GetRecoParam()->GetBendingVertexDispersion());
+ fNRecTracks++;
+
+ // Look for compatible cluster(s) in the second chamber of station 5
+ clusterFound = FollowLinearTrackInChamber(*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
+ FollowLinearTrackInChamber(*track, clusterStore, 13-ich1);
+
+ iCurrentTrack++;
+ }
+
+ // abort tracking if there are too many candidates
+ if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
+ return kFALSE;
+ }
+
}
}
-
}
- fRecTracksPtr->Compress(); // this is essential before checking tracks
+ // Retrace tracks using Kalman filter (also compute track chi2) and select them
+ nCurrentTracks = fRecTracksPtr->GetLast()+1;
+ for (Int_t iRecTrack = initialNRecTracks; iRecTrack < nCurrentTracks; iRecTrack++) {
+ track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
+
+ // skip empty slots
+ if(!track) continue;
+
+ // 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 all different tracks or only the best ones as required
- if (AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) RemoveIdenticalTracks();
- else RemoveDoubleTracks();
+ // Keep only the best tracks if required
+ if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
+ else fRecTracksPtr->Compress();
AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
+ return kTRUE;
+
}
//__________________________________________________________________________
-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();
// 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();
lastTrackParam->SetNonBendingSlope((x1 - x2) / dZ);
lastTrackParam->SetBendingSlope((y1 - y2) / dZ);
Double_t bendingImpact = y2 - z2 * lastTrackParam->GetBendingSlope();
- lastTrackParam->SetInverseBendingMomentum(1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact));
+ 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
lastParamCov(0,0) = cluster2->GetErrX2();
- lastParamCov(1,1) = 100. * ( cluster1->GetErrX2() + cluster2->GetErrX2() ) / dZ / dZ;
+ lastParamCov(0,1) = - cluster2->GetErrX2() / dZ;
+ lastParamCov(1,0) = lastParamCov(0,1);
+ lastParamCov(1,1) = ( 1000. * cluster1->GetErrX2() + cluster2->GetErrX2() ) / dZ / dZ;
// Bending plane
lastParamCov(2,2) = cluster2->GetErrY2();
- lastParamCov(3,3) = 100. * ( cluster1->GetErrY2() + cluster2->GetErrY2() ) / dZ / dZ;
- // Inverse bending momentum (50% error)
- lastParamCov(4,4) = 0.5*lastTrackParam->GetInverseBendingMomentum() * 0.5*lastTrackParam->GetInverseBendingMomentum();
+ lastParamCov(2,3) = - cluster2->GetErrY2() / dZ;
+ lastParamCov(3,2) = lastParamCov(2,3);
+ lastParamCov(3,3) = ( 1000. * cluster1->GetErrY2() + cluster2->GetErrY2() ) / dZ / dZ;
+ // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
+ if (AliMUONTrackExtrap::IsFieldON()) {
+ lastParamCov(4,4) = ((GetRecoParam()->GetBendingVertexDispersion() *
+ GetRecoParam()->GetBendingVertexDispersion() +
+ (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * 1000. * cluster1->GetErrY2()) / dZ / dZ) /
+ bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum;
+ lastParamCov(2,4) = z1 * cluster2->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ lastParamCov(4,2) = lastParamCov(2,4);
+ lastParamCov(3,4) = - (z1 * cluster2->GetErrY2() + z2 * 1000. * cluster1->GetErrY2()) *
+ inverseBendingMomentum / bendingImpact / dZ / dZ;
+ lastParamCov(4,3) = lastParamCov(3,4);
+ } else lastParamCov(4,4) = inverseBendingMomentum*inverseBendingMomentum;
lastTrackParam->SetCovariances(lastParamCov);
// Reset the track chi2
}
// 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 (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());
+ 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(),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ if (!AliMUONTrackExtrap::ExtrapToZCov(trackParamAtCluster, trackParamAtCluster->GetClusterPtr()->GetZ(),
+ GetRecoParam()->UseSmoother())) extrapStatus = kFALSE;
- 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
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;
+
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::FollowTracks(AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructorK::FollowTracks(AliMUONVClusterStore& clusterStore)
{
/// Follow tracks in stations(1..) 3, 2 and 1
AliDebug(1,"Enter FollowTracks");
AliMUONTrack *track;
Int_t currentNRecTracks;
- Bool_t clusterFound;
for (Int_t station = 2; station >= 0; station--) {
track = (AliMUONTrack*) fRecTracksPtr->UncheckedAt(iRecTrack);
- // 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 station(0..) "station"
- clusterFound = FollowTrackInStation(*track, clusterStore, station);
-
- // Try to recover track if required
- if (!clusterFound && AliMUONReconstructor::GetRecoParam()->RecoverTracks())
- clusterFound = RecoverTrack(*track, clusterStore, 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--;
+ }
+
+ }
- // remove track if no cluster found
- if (!clusterFound) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
+ // abort tracking if there are too many candidates
+ if (GetRecoParam()->RequestStation(station)) {
+ if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
+ 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). Stop tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1));
+ return kFALSE;
+ }
}
}
fRecTracksPtr->Compress(); // this is essential before checking tracks
// Keep only the best tracks if required
- if (!AliMUONReconstructor::GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
+ if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
+
+ }
+
+ return kTRUE;
+
+}
+
+ //__________________________________________________________________________
+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 chi2OfCluster;
+ Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
+ Double_t addChi2TrackAtCluster;
+ Double_t bestAddChi2TrackAtCluster = AliMUONTrack::MaxChi2();
+ 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
+ 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
+ while (currentChamber > nextChamber + 1) {
+ // extrapolation to the missing chamber
+ currentChamber--;
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber),
+ GetRecoParam()->UseSmoother())) return kFALSE;
+ // add MCS effect
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
+ }
+
+ //Extrapolate trackCandidate to chamber
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber),
+ GetRecoParam()->UseSmoother())) return kFALSE;
+
+ // 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) {
+
+ if (GetRecoParam()->UseSmoother()) {
+ // save extrapolated parameters for smoother
+ extrapTrackParamAtCluster.SetExtrapParameters(extrapTrackParamAtCluster.GetParameters());
+
+ // save extrapolated covariance matrix for smoother
+ extrapTrackParamAtCluster.SetExtrapCovariances(extrapTrackParamAtCluster.GetCovariances());
+ }
+
+ // Compute new track parameters including new cluster using kalman filter
+ addChi2TrackAtCluster = RunKalmanFilter(extrapTrackParamAtCluster);
+
+ // skip track out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster)) continue;
+
+ // remember a cluster was found
+ foundOneCluster = kTRUE;
+
+ // Printout for debuging
+ if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
+ cout << "FollowTrackInChamber: found one cluster in chamber(1..): " << nextChamber+1
+ << " (Chi2 = " << chi2OfCluster << ")" << endl;
+ cluster->Print();
+ }
+
+ 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;
+ }
+
+ }
}
+ // 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;
+
+ } else if (foundOneCluster) {
+
+ // remove obsolete track
+ fRecTracksPtr->Remove(&trackCandidate);
+ fNRecTracks--;
+
+ } else return kFALSE;
+
+ return kTRUE;
+
}
//__________________________________________________________________________
}
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;
- 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();
+ // 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.);
+ Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-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
+ while (ch1 < ch2 && currentChamber > ch2 + 1) {
// extrapolation to the missing chamber
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2 + 1),
- AliMUONReconstructor::GetRecoParam()->UseSmoother());
+ currentChamber--;
+ 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),
- AliMUONReconstructor::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)) {
- 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);
}
+ 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));
// 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) {
- Bool_t foundSecondCluster = kFALSE;
- // Printout for debuging
- if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
- cout << "FollowTrackInStation: found one cluster in chamber(1..): " << ch2+1
- << " (Chi2 = " << chi2OfCluster << ")" << endl;
- 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 out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster2)) continue;
+
+ // Printout for debuging
+ 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;
+ }
+
// copy new track parameters for next step
extrapTrackParam = extrapTrackParamAtCluster2;
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParam,AliMUONConstants::ChamberThicknessInX0(ch2),-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());
+ Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1),
+ GetRecoParam()->UseSmoother());
// reset cluster iterator of chamber 1
nextInCh1.Reset();
iCluster1 = -1;
// look for second candidates in chamber 1
- while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
+ Bool_t foundSecondCluster = kFALSE;
+ if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
iCluster1++;
// try to add the current cluster fast
// 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) {
- foundSecondCluster = kTRUE;
- foundTwoClusters = kTRUE;
-
- // 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;
- }
- 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 out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster1)) continue;
+
+ // remember a second cluster was found
+ foundSecondCluster = kTRUE;
+ foundTwoClusters = kTRUE;
+
+ // 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;
+ clusterCh1->Print();
+ }
+
+ 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);
fNRecTracks++;
- // 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(*newTrack,kTRUE);
-
// Tag clusterCh1 as used
clusterCh1Used[iCluster1] = kTRUE;
// if no clusterCh1 found then consider to add clusterCh2 only
if (!foundSecondCluster) {
+
+ // remember a cluster was found
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);
fNRecTracks++;
- // 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(*newTrack,kTRUE);
-
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch2+1 << endl;
// 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) {
+ if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
+
+ // add MCS effect for next step
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
+
+ //Extrapolate trackCandidate to chamber "ch1"
+ Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1),
+ 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;
}
- // 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());
-
// reset cluster iterator of chamber 1
nextInCh1.Reset();
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
// 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 (chi2OfCluster < maxChi2OfCluster) {
- foundOneCluster = kTRUE;
-
- // 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;
- }
- 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 out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster1)) continue;
+
+ // remember a cluster was found
+ foundOneCluster = kTRUE;
+
+ // 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;
+ clusterCh1->Print();
+ }
+
+ 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);
fNRecTracks++;
- // 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(*newTrack,kTRUE);
-
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
cout << "FollowTrackInStation: added one cluster in chamber(1..): " << ch1+1 << endl;
}
// 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;
} else if (foundOneCluster) {
UpdateTrack(trackCandidate,bestTrackParamAtCluster1,bestAddChi2TrackAtCluster1);
- // 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;
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
/// 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
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));
+ if (!RetracePartialTrack(trackCandidate,(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->UncheckedAt(1))) return kFALSE;
+
+ // skip track out of limits
+ if (!IsAcceptable(*((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First()))) return kFALSE;
// Look for new cluster(s) in next station
return FollowTrackInStation(trackCandidate, clusterStore, nextStation);
// 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 localChi2 = 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(localChi2);
+ // 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);
}
//__________________________________________________________________________
-void AliMUONTrackReconstructorK::ComplementTracks(const AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructorK::ComplementTracks(const AliMUONVClusterStore& clusterStore)
{
/// 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
+ /// two detection elements, the track may have two clusters in the same chamber).
+ /// Recompute track parameters and covariances at each clusters.
+ /// 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;
Double_t chi2OfCluster, addChi2TrackAtCluster, bestAddChi2TrackAtCluster;
- Double_t maxChi2OfCluster = 2. * AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
- Bool_t foundOneCluster, trackModified;
+ Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
+ GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
+ Bool_t foundOneCluster, trackModified, hasChanged = kFALSE;
AliMUONVCluster *cluster;
AliMUONTrackParam *trackParam, *previousTrackParam, *nextTrackParam, trackParamAtCluster, bestTrackParamAtCluster;
-
- // Remove double track to complete only "good" tracks
- RemoveDoubleTracks();
+ 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();
// add new cluster if any
if (foundOneCluster) {
+
+ // 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;
+ hasChanged = kTRUE;
}
previousTrackParam = trackParam;
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 = AliMUONReconstructor::GetRecoParam()->GetSigmaCutForImprovement() *
- AliMUONReconstructor::GetRecoParam()->GetSigmaCutForImprovement();
+ Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForImprovement() *
+ GetRecoParam()->GetSigmaCutForImprovement();
while (!track.IsImproved()) {
// identify removable clusters
- track.TagRemovableClusters();
+ track.TagRemovableClusters(GetRecoParam()->RequestedStationMask());
// Run smoother if required
smoothed = kFALSE;
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track);
+ if (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();
+ 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) {
// save parameters into smooth parameters in case of smoother did not work properly
- if (AliMUONReconstructor::GetRecoParam()->UseSmoother() && !smoothed) {
+ if (GetRecoParam()->UseSmoother() && !smoothed) {
trackParamAtCluster->SetSmoothParameters(trackParamAtCluster->GetParameters());
trackParamAtCluster->SetSmoothCovariances(trackParamAtCluster->GetCovariances());
}
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 (AliMUONReconstructor::GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track);
- if (!smoothed) track.UpdateCovTrackParamAtCluster();
- } else smoothed = AliMUONReconstructor::GetRecoParam()->UseSmoother();
+ if (track.IsImproved()) smoothed = GetRecoParam()->UseSmoother();
+ else {
+ if (GetRecoParam()->UseSmoother()) smoothed = RunSmoother(track);
+ 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;
+
}
//__________________________________________________________________________
-Bool_t AliMUONTrackReconstructorK::RefitTrack(AliMUONTrack &track)
+Bool_t AliMUONTrackReconstructorK::RefitTrack(AliMUONTrack &track, Bool_t enableImprovement)
{
/// re-fit the given track
+ AliDebug(1,"Enter RefitTrack");
- // check validity of the track
- if (!track.IsValid()) {
- 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
- if (AliMUONReconstructor::GetRecoParam()->ImproveTracks()) ImproveTrack(track);
+ 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