#include "AliMUONTrack.h"
#include "AliMUONTrackParam.h"
#include "AliMUONTrackExtrap.h"
+#include "AliMUONRecoParam.h"
#include "AliMpArea.h"
}
//__________________________________________________________________________
-void AliMUONTrackReconstructor::MakeTrackCandidates(AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructor::MakeTrackCandidates(AliMUONVClusterStore& clusterStore)
{
/// 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.
for (Int_t i = firstChamber; i <= lastChamber; ++i )
{
- if (fClusterServer && GetRecoParam()->UseChamber(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
clusterFound = FollowLinearTrackInStation(*track, clusterStore, 7-istat);
else clusterFound = FollowTrackInStation(*track, clusterStore, 7-istat);
- // Remove track if no cluster found
- if (!clusterFound && GetRecoParam()->RequestStation(7-istat)) {
- 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));
+ delete segments;
+ return kFALSE;
+ }
+ } else {
+ if ((fNRecTracks + segments->GetEntriesFast() - iseg - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks + segments->GetEntriesFast() - iseg - 1));
+ delete segments;
+ return kFALSE;
+ }
}
}
delete segments;
}
- fRecTracksPtr->Compress(); // this is essential before checking tracks
-
// 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));
+ return kTRUE;
+
}
//__________________________________________________________________________
-void AliMUONTrackReconstructor::MakeMoreTrackCandidates(AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructor::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
/// 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;
Bool_t clusterFound;
// Make segments in the station
segments = MakeSegmentsBetweenChambers(clusterStore, ich1, ich2);
+ /// Remove segments already attached to a track
+ RemoveUsedSegments(*segments);
+
// 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
iCurrentTrack = fRecTracksPtr->GetLast()+1;
- track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack((AliMUONObjectPair*)((*segments)[iseg]),GetRecoParam()->GetBendingVertexDispersion());
+ track = new ((*fRecTracksPtr)[iCurrentTrack]) AliMUONTrack(segment,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);
+ clusterFound = FollowLinearTrackInChamber(*track, clusterStore, 17-ich2);
// skip the original track in case it has been removed
if (GetRecoParam()->TrackAllTracks() && clusterFound) iCurrentTrack++;
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);
+ 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));
+ delete segments;
+ return kFALSE;
+ }
+
}
// delete the array of segments
}
}
- fRecTracksPtr->Compress(); // this is essential before checking tracks
-
- // Keep all different tracks or only the best ones as required
- if (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 AliMUONTrackReconstructor::FollowTracks(AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructor::FollowTracks(AliMUONVClusterStore& clusterStore)
{
/// Follow tracks in stations(1..) 3, 2 and 1
AliDebug(1,"Enter FollowTracks");
Fit(*track, kFALSE, kTRUE, kTRUE);
else Fit(*track, kFALSE, kFALSE, kTRUE);
- // remove track with absolute bending momentum out of limits
- // or if the normalized chi2 is too high
- Double_t bendingMomentum = TMath::Abs(1. / ((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First())->GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum() ||
- track->GetNormalizedChi2() > sigmaCut2) {
+ // remove tracks out of limits
+ if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
fRecTracksPtr->Remove(track);
- fNRecTracks--;
- continue;
+ fNRecTracks--;
+ continue;
+ }
+
+ // remove track if the normalized chi2 is too high
+ if (track->GetNormalizedChi2() > sigmaCut2) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ continue;
}
// save parameters from fit into smoothed parameters to complete track afterward
if (station==2) { // save track parameters on stations 4 and 5
// extrapolate track parameters and covariances at each cluster
- track->UpdateCovTrackParamAtCluster();
+ // remove the track in case of failure
+ if (!track->UpdateCovTrackParamAtCluster()) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ continue;
+ }
// save them
trackParam = (AliMUONTrackParam*) track->GetTrackParamAtCluster()->First();
nextTrackParam->SetCovariances(trackParam->GetCovariances());
// extrapolate them to the z of the corresponding cluster
- AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetClusterPtr()->GetZ());
+ // remove the track in case of failure
+ if (!AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetClusterPtr()->GetZ())) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ continue;
+ }
// save them
nextTrackParam->SetSmoothParameters(nextTrackParam->GetParameters());
}
+ // abort tracking if there are too many candidates
+ if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Stop tracking.", fNRecTracks));
+ return kFALSE;
+ }
+
}
// Compress fRecTracksPtr for the next step
nextTrackParam->SetCovariances(trackParam->GetCovariances());
// extrapolate them to the z of the corresponding cluster
- AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetClusterPtr()->GetZ());
+ // remove the track in case of failure
+ if (!AliMUONTrackExtrap::ExtrapToZCov(nextTrackParam, nextTrackParam->GetClusterPtr()->GetZ())) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ track = nextTrack;
+ continue;
+ }
// save them
nextTrackParam->SetSmoothParameters(nextTrackParam->GetParameters());
fRecTracksPtr->Compress();
+ return kTRUE;
+
}
//__________________________________________________________________________
/// kFALSE: add only the best cluster(s) to the "trackCandidate". Try to add a couple of clusters in priority.
AliDebug(1,Form("Enter FollowTrackInChamber(1..) %d", nextChamber+1));
- Double_t chi2WithOneCluster = 1.e10;
+ Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
Double_t bestChi2WithOneCluster = maxChi2WithOneCluster;
}
// Add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
// 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));
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber))) return kFALSE;
// add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
}
//Extrapolate trackCandidate to chamber
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber));
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(nextChamber))) return kFALSE;
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
ch2 = 2*nextStation+1;
}
- Double_t chi2WithOneCluster = 1.e10;
- Double_t chi2WithTwoClusters = 1.e10;
+ Double_t chi2WithOneCluster = AliMUONTrack::MaxChi2();
+ Double_t chi2WithTwoClusters = AliMUONTrack::MaxChi2();
Double_t maxChi2WithOneCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
Double_t maxChi2WithTwoClusters = 4. * GetRecoParam()->GetSigmaCutForTracking() *
AliMUONTrackParam bestTrackParamAtCluster1;
AliMUONTrackParam bestTrackParamAtCluster2;
- Int_t nClusters = clusterStore.GetSize();
- Bool_t *clusterCh1Used = new Bool_t[nClusters];
- for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
- Int_t iCluster1;
-
// Get track parameters according to the propagation direction
if (nextStation==4) extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->Last();
else extrapTrackParamAtCh = *(AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First();
}
// Add MCS effect
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(currentChamber),-1.);
// Add MCS in the missing chamber(s) if any
- Int_t currentChamber = extrapTrackParamAtCh.GetClusterPtr()->GetChamberId();
while (ch1 < ch2 && currentChamber > ch2 + 1) {
// extrapolation to the missing chamber
currentChamber--;
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber));
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(currentChamber))) 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));
+ if (!AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch2))) return kFALSE;
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
if (nextStation < 3) AskForNewClustersInStation(extrapTrackParamAtCh, clusterStore, nextStation);
}
+ Int_t nClusters = clusterStore.GetSize();
+ Bool_t *clusterCh1Used = new Bool_t[nClusters];
+ for (Int_t i = 0; i < nClusters; i++) clusterCh1Used[i] = kFALSE;
+ Int_t iCluster1;
+
// Create iterators to loop over clusters in both chambers
TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
TIter nextInCh2(clusterStore.CreateChamberIterator(ch2,ch2));
}
// add MCS effect for next step
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCluster2,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
// copy new track parameters for next step
extrapTrackParam = extrapTrackParamAtCluster2;
//Extrapolate track parameters to chamber "ch1"
- AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1));
+ Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(ch1));
// 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++;
// try to add the current cluster fast
if (!TryOneClusterFast(extrapTrackParam, clusterCh1)) continue;
- // try to add the current cluster accuratly
+ // try to add the current cluster accurately
chi2WithTwoClusters = TryTwoClusters(extrapTrackParamAtCluster2, clusterCh1, extrapTrackParamAtCluster1);
// if good chi2 then create a new track by adding the 2 clusters to the "trackCandidate"
if (GetRecoParam()->TrackAllTracks() || !foundTwoClusters) {
// add MCS effect for next step
- AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(),1.);
+ AliMUONTrackExtrap::AddMCSEffect(&extrapTrackParamAtCh,AliMUONConstants::ChamberThicknessInX0(ch2),-1.);
//Extrapolate trackCandidate to chamber "ch1"
- AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1));
+ Bool_t normalExtrap = AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParamAtCh, AliMUONConstants::DefaultChamberZ(ch1));
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructor") >= 2) || (AliLog::GetGlobalDebugLevel() >= 2)) {
iCluster1 = -1;
// look for second candidates in chamber 1
- while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
+
if (normalExtrap) while ( ( clusterCh1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
iCluster1++;
if (clusterCh1Used[iCluster1]) continue; // Skip cluster already used
/// return trackParamAtCluster1 & 2
// extrapolate track parameters at the z position of the second cluster (no need to extrapolate the covariances)
+ // and set pointer to cluster into trackParamAtCluster
trackParamAtCluster2.SetParameters(trackParamAtCluster1.GetParameters());
trackParamAtCluster2.SetZ(trackParamAtCluster1.GetZ());
- AliMUONTrackExtrap::ExtrapToZ(&trackParamAtCluster2, cluster2->GetZ());
-
- // set pointer to cluster2 into trackParamAtCluster2
trackParamAtCluster2.SetClusterPtr(cluster2);
+ if (!AliMUONTrackExtrap::ExtrapToZ(&trackParamAtCluster2, cluster2->GetZ())) return 2.*AliMUONTrack::MaxChi2();
// Set differences between track and the 2 clusters in the bending and non bending directions
AliMUONVCluster* cluster1 = trackParamAtCluster1.GetClusterPtr();
// copy track parameters at first cluster for jacobian calculation
AliMUONTrackParam trackParam(trackParamAtCluster1);
- // add MCS effect to the covariance matrix at first cluster
- AliMUONTrackExtrap::AddMCSEffect(&trackParam,AliMUONConstants::ChamberThicknessInX0(),1.);
-
// Get the pointer to the parameter covariance matrix at first cluster
const TMatrixD& kParamCov = trackParam.GetCovariances();
jacob(1,2) = 1.; // dy1/dy
// first derivative at the second cluster:
TMatrixD dParam(5,1);
+ Double_t direction[5] = {-1.,-1.,1.,1.,-1.};
for (Int_t i=0; i<5; i++) {
// Skip jacobian calculation for parameters with no associated error
if (kParamCov(i,i) == 0.) continue;
for (Int_t j=0; j<5; j++) {
if (j==i) {
dParam(j,0) = TMath::Sqrt(kParamCov(i,i));
- if (j == 4) dParam(j,0) *= TMath::Sign(1.,-paramAtCluster1Save(4,0)); // variation always in the same direction
+ dParam(j,0) *= TMath::Sign(1.,direction[j]*paramAtCluster1Save(j,0)); // variation always in the same direction
} else dParam(j,0) = 0.;
}
trackParam.SetZ(cluster1->GetZ());
// Extrapolate new track parameters to the z position of the second cluster
- AliMUONTrackExtrap::ExtrapToZ(&trackParam,cluster2->GetZ());
+ if (!AliMUONTrackExtrap::ExtrapToZ(&trackParam,cluster2->GetZ())) return 2.*AliMUONTrack::MaxChi2();
// Calculate the jacobian
jacob(2,i) = (trackParam.GetNonBendingCoor() - nonBendingCoor2) / dParam(i,0); // dx2/dParami
error.Invert();
} else {
AliWarning(" Determinant error=0");
- return 1.e10;
+ return 2.*AliMUONTrack::MaxChi2();
}
// Compute the Chi2 value
// Calculate the track parameter covariance matrix
Fit(trackCandidate, kFALSE, kFALSE, kTRUE);
+ // skip track if the normalized chi2 is too high
+ if (trackCandidate.GetNormalizedChi2() > GetRecoParam()->GetSigmaCutForTracking() * GetRecoParam()->GetSigmaCutForTracking()) 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);
// add multiple scattering effets
AliMUONTrackParam paramAtVertex(*((AliMUONTrackParam*)(trackCandidate.GetTrackParamAtCluster()->First())));
paramAtVertex.DeleteCovariances(); // to be sure to account only for multiple scattering
- AliMUONTrackExtrap::ExtrapToVertexUncorrected(¶mAtVertex,0.);
- const TMatrixD& kParamCov = paramAtVertex.GetCovariances();
- nonBendingReso2 += kParamCov(0,0);
- bendingReso2 += kParamCov(2,2);
+ if (!AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex,AliMUONConstants::AbsZEnd())) {
+ nonBendingReso2 = 0.;
+ bendingReso2 = 0.;
+ } else {
+ AliMUONTrackExtrap::ExtrapToVertexUncorrected(¶mAtVertex,0.);
+ const TMatrixD& kParamCov = paramAtVertex.GetCovariances();
+ nonBendingReso2 += kParamCov(0,0);
+ bendingReso2 += kParamCov(2,2);
+ }
// Set the vertex resolution square
trackCandidate.SetVertexErrXY2(nonBendingReso2,bendingReso2);
track.FitWithMCS(includeMCS);
if (includeMCS) {
// compute cluster weights only once
- if (!track.ComputeClusterWeights()) {
+ if (!track.UpdateTrackParamAtCluster() || !track.ComputeClusterWeights()) {
AliWarning("cannot take into account the multiple scattering effects");
track.FitWithMCS(kFALSE);
}
trackParamAtCluster->SetBendingCoor(param[2]);
trackParamAtCluster->SetBendingSlope(param[3]);
trackParamAtCluster->SetInverseBendingMomentum(param[4]);
- trackBeingFitted->UpdateTrackParamAtCluster();
+ if (!trackBeingFitted->UpdateTrackParamAtCluster()) {
+ chi2 = 2.*AliMUONTrack::MaxChi2();
+ return;
+ }
// Take the vertex into account in the fit if required
if (trackBeingFitted->FitWithVertex()) {
Double_t nonBendingReso2,bendingReso2;
trackBeingFitted->GetVertexErrXY2(nonBendingReso2,bendingReso2);
- if (nonBendingReso2 == 0. || bendingReso2 == 0.) chi2 += 1.e10;
- else {
- AliMUONTrackParam paramAtVertex(*trackParamAtCluster);
- AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex, 0.); // vextex position = (0,0,0)
+ AliMUONTrackParam paramAtVertex(*trackParamAtCluster);
+ if (nonBendingReso2 != 0. && bendingReso2 != 0. && AliMUONTrackExtrap::ExtrapToZ(¶mAtVertex, 0.)) { // vextex position = (0,0,0)
dX = paramAtVertex.GetNonBendingCoor();
dY = paramAtVertex.GetBendingCoor();
chi2 += dX * dX / nonBendingReso2 + dY * dY / bendingReso2;
+ } else {
+ chi2 = 2.*AliMUONTrack::MaxChi2();
+ return;
}
}
}
//__________________________________________________________________________
-void AliMUONTrackReconstructor::ComplementTracks(const AliMUONVClusterStore& clusterStore)
+Bool_t AliMUONTrackReconstructor::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)
- /// Re-fit track parameters and covariances
+ /// two detection elements, the track may have two clusters in the same chamber).
+ /// Re-fit track parameters and covariances.
+ /// Return kTRUE if one or more tracks have been complemented.
AliDebug(1,"Enter ComplementTracks");
Int_t chamberId, detElemId;
Double_t chi2OfCluster, bestChi2OfCluster;
Double_t sigmaCut2 = GetRecoParam()->GetSigmaCutForTracking() *
GetRecoParam()->GetSigmaCutForTracking();
- Bool_t foundOneCluster, trackModified;
+ Bool_t foundOneCluster, trackModified, hasChanged = kFALSE;
AliMUONVCluster* cluster;
AliMUONTrackParam *trackParam, *nextTrackParam, copyOfTrackParam, trackParamAtCluster, bestTrackParamAtCluster;
bestTrackParamAtCluster.SetRemovable(kTRUE);
track->AddTrackParamAtCluster(bestTrackParamAtCluster,*(bestTrackParamAtCluster.GetClusterPtr()));
trackModified = kTRUE;
+ hasChanged = kTRUE;
}
trackParam = nextTrackParam;
track = (AliMUONTrack*) fRecTracksPtr->After(track);
}
+ return hasChanged;
+
}
//__________________________________________________________________________
track.TagRemovableClusters(GetRecoParam()->RequestedStationMask());
// Update track parameters and covariances
- track.UpdateCovTrackParamAtCluster();
+ if (!track.UpdateCovTrackParamAtCluster()) {
+ AliWarning("unable to update track parameters and covariances --> stop improvement");
+ break;
+ }
// Compute local chi2 of each clusters
track.ComputeLocalChi2(kTRUE);
}
//__________________________________________________________________________
-void AliMUONTrackReconstructor::FinalizeTrack(AliMUONTrack &track)
+Bool_t AliMUONTrackReconstructor::FinalizeTrack(AliMUONTrack &track)
{
/// Recompute track parameters and covariances at each attached cluster
/// from those at the first one, if not already done
AliDebug(1,"Enter FinalizeTrack");
- if (!track.IsImproved()) track.UpdateCovTrackParamAtCluster();
+ if (!track.IsImproved() && !track.UpdateCovTrackParamAtCluster()) {
+ AliWarning("finalization failed due to extrapolation problem");
+ return kFALSE;
+ }
+ return kTRUE;
}
//__________________________________________________________________________
/// re-fit the given track
// check validity of the track
- if (!track.IsValid(GetRecoParam()->RequestedStationMask())) {
+ if (track.GetNClusters() < 3) {
AliWarning("the track does not contain enough clusters --> unable to refit");
return kFALSE;
}
// compute track parameters at each cluster from parameters at the first one
// necessary to compute multiple scattering effect during refitting
- track.UpdateTrackParamAtCluster();
+ if (!track.UpdateTrackParamAtCluster()) {
+ AliWarning("bad track refitting due to extrapolation failure");
+ return kFALSE;
+ }
// Re-fit the track:
// Take into account the multiple scattering
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