{
Int_t saturation(3000);
- if ( gain )
+ if ( gain && ( fApplyGains != fgkNoGain ) )
{
saturation = gain->ValueAsInt(manuChannel,4);
}
fChargeSigmaCut(4.0),
fRemoveConnectedTracksInSt12(kFALSE),
fMaxTriggerTracks(0),
- fMaxTrackCandidates(0)
+ fMaxTrackCandidates(0),
+ fSelectTrackOnSlope(kFALSE)
{
/// Constructor
fMaxBendingMomentum = 3000.;
fMaxNonBendingSlope = 0.3;
fMaxBendingSlope = 0.4;
- fNonBendingVertexDispersion = 10.;
- fBendingVertexDispersion = 10.;
+ fSelectTrackOnSlope = kFALSE;
+ fNonBendingVertexDispersion = 70.;
+ fBendingVertexDispersion = 70.;
fMaxNonBendingDistanceToTrack = 1.;
fMaxBendingDistanceToTrack = 1.;
fSigmaCutForTracking = 6.;
fMaxBendingMomentum = 3000.;
fMaxNonBendingSlope = 0.3;
fMaxBendingSlope = 0.4;
- fNonBendingVertexDispersion = 10.;
- fBendingVertexDispersion = 10.;
+ fSelectTrackOnSlope = kFALSE;
+ fNonBendingVertexDispersion = 70.;
+ fBendingVertexDispersion = 70.;
fMaxNonBendingDistanceToTrack = 1.;
fMaxBendingDistanceToTrack = 1.;
fSigmaCutForTracking = 6.;
SetEventSpecie(AliRecoParam::kCosmic);
fMinBendingMomentum = 1.;
fMaxBendingMomentum = 10000000.;
- fMaxNonBendingSlope = 0.3;
- fMaxBendingSlope = 0.4;
- fNonBendingVertexDispersion = 10.;
- fBendingVertexDispersion = 10.;
- fMaxNonBendingDistanceToTrack = 10.;
- fMaxBendingDistanceToTrack = 10.;
+ fMaxNonBendingSlope = 0.4;
+ fMaxBendingSlope = 0.5;
+ fSelectTrackOnSlope = kTRUE;
+ fNonBendingVertexDispersion = 200.;
+ fBendingVertexDispersion = 200.;
+ fMaxNonBendingDistanceToTrack = 1.;
+ fMaxBendingDistanceToTrack = 1.;
fSigmaCutForTracking = 7.;
fSigmaCutForImprovement = 7.;
fSigmaCutForTrigger = 8.;
if (fSaveFullClusterInESD) cout<<Form("Save all cluster info in ESD for %5.2f %% of events",fPercentOfFullClusterInESD)<<endl;
else cout<<"Save partial cluster info in ESD"<<endl;
- cout<<Form("Bending momentum range = [%5.2f,%5.2f]",fMinBendingMomentum,fMaxBendingMomentum)<<endl;
-
- cout<<Form("Maximum non bending slope = %5.2f",fMaxNonBendingSlope)<<endl;
-
- cout<<Form("Maximum bending slope (used only if B=0) = %5.2f",fMaxBendingSlope)<<endl;
-
- if (strstr(fTrackingMode,"ORIGINAL"))
- cout<<Form("Vertex dispertion = (%5.2f,%5.2f)",fNonBendingVertexDispersion,fBendingVertexDispersion)<<endl;
- else if (strstr(option,"FULL"))
- cout<<Form("Vertex dispertion (used for original tracking only) = (%5.2f,%5.2f)",fNonBendingVertexDispersion,fBendingVertexDispersion)<<endl;
+ cout<<"Selection of track candidates:"<<endl;
+ if (fSelectTrackOnSlope) cout<<Form("\t- Non-bending slope < %5.2f",fMaxNonBendingSlope)<<endl;
+ else cout<<"\t- Impact parameter < 3 * vertex dispersion in the non-bending direction"<<endl;
+ cout<<Form("\t- if B!=0: Bending momentum > %5.2f",fMinBendingMomentum)<<endl;
+ if (fSelectTrackOnSlope) cout<<Form("\t if B==0: Bending slope < %5.2f",fMaxBendingSlope)<<endl;
+ else cout<<"\t if B==0: Impact parameter < 3 * vertex dispersion in the bending direction"<<endl;
+
+ cout<<Form("Vertex dispersion (used to estimate initial bending momentum resolution) = (%5.2f,%5.2f)",fNonBendingVertexDispersion,fBendingVertexDispersion)<<endl;
cout<<Form("Maximum distance to track = (%5.2f,%5.2f)",fMaxNonBendingDistanceToTrack,fMaxBendingDistanceToTrack)<<endl;
void SetMaxBendingMomentum(Double_t val) {fMaxBendingMomentum = val;}
/// return the maximum value (GeV/c) of momentum in bending plane
Double_t GetMaxBendingMomentum() const {return fMaxBendingMomentum;}
+
/// set the maximum value of the non bending slope
void SetMaxNonBendingSlope(Double_t val) {fMaxNonBendingSlope = val;}
/// return the maximum value of the non bending slope
/// return the maximum value of the bending slope
Double_t GetMaxBendingSlope() const {return fMaxBendingSlope;}
+ /// switch on/off the track selection according to their slope (instead of their impact parameter)
+ void SelectOnTrackSlope(Bool_t flag) {fSelectTrackOnSlope = flag;}
+ /// return kTRUE/kFALSE if tracks are selected according to their slope/impact parameter
+ Bool_t SelectOnTrackSlope() const {return fSelectTrackOnSlope;}
+
/// set the vertex dispersion (cm) in non bending plane (used for original tracking only)
void SetNonBendingVertexDispersion(Double_t val) {fNonBendingVertexDispersion = val;}
/// return the vertex dispersion (cm) in non bending plane (used for original tracking only)
Int_t fMaxTriggerTracks; ///< maximum number of trigger tracks above which the tracking is cancelled
Int_t fMaxTrackCandidates; ///< maximum number of track candidates above which the tracking abort
+ Bool_t fSelectTrackOnSlope; ///< select track candidates according to their slope (instead of their impact parameter)
+
// functions
void SetLowFluxParam();
void SetHighFluxParam();
void SetCosmicParam();
- ClassDef(AliMUONRecoParam,12) // MUON reco parameters
+ ClassDef(AliMUONRecoParam,13) // MUON reco parameters
};
#endif
if (bendingMomentum == 0.) return 1.e10;
- const Double_t kCorrectionFactor = 0.9; // impact parameter is 10% overestimated
+ const Double_t kCorrectionFactor = 1.1; // impact parameter is 10% underestimated
return kCorrectionFactor * (-0.0003 * fgSimpleBValue * fgkSimpleBLength * fgkSimpleBPosition / bendingMomentum);
}
TMatrixD jacob(5,5);
jacob.Zero();
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));
- dParam(j,0) *= TMath::Sign(1.,paramSave(j,0)); // variation always in the same direction
+ dParam(j,0) *= TMath::Sign(1.,direction[j]*paramSave(j,0)); // variation always in the same direction
} else dParam(j,0) = 0.;
}
fLocalChi2(0.)
{
/// Constructor
+ fParameters.Zero();
}
//_________________________________________________________________________
// Remove track if no cluster found on a requested station
// or abort tracking if there are too many candidates
- if (!clusterFound && GetRecoParam()->RequestStation(7-istat)) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
- delete segments;
- return kFALSE;
+ if (GetRecoParam()->RequestStation(7-istat)) {
+ if (!clusterFound) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ delete segments;
+ return kFALSE;
+ }
+ } else {
+ if ((fNRecTracks + segments->GetEntriesFast() - iseg - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + segments->GetEntriesFast() - iseg - 1));
+ delete segments;
+ return kFALSE;
+ }
}
}
}
// abort tracking if there are too many candidates
- if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
delete segments;
return kFALSE;
}
Fit(*track, kFALSE, kTRUE, kTRUE);
else Fit(*track, kFALSE, kFALSE, kTRUE);
- // remove track with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- Double_t bendingMomentum = TMath::Abs(1. / ((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First())->GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- continue;
- }
+ // remove tracks out of limits
+ if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ continue;
}
// remove track if the normalized chi2 is too high
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.;
}
// Calculate the track parameter covariance matrix
Fit(trackCandidate, kFALSE, kFALSE, kTRUE);
- // skip track with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- Double_t bendingMomentum = TMath::Abs(1. / ((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First())->GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) 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);
// Remove track if no cluster found on a requested station
// or abort tracking if there are too many candidates
- if (!clusterFound && GetRecoParam()->RequestStation(7-istat)) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
- delete segments;
- return kFALSE;
+ if (GetRecoParam()->RequestStation(7-istat)) {
+ if (!clusterFound) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
+ } else if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ delete segments;
+ return kFALSE;
+ }
+ } else {
+ if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
+ delete segments;
+ return kFALSE;
+ }
}
}
// retrace tracks using Kalman filter
RetraceTrack(*track,kTRUE);
- // remove tracks with absolute bending momentum out of limits
- if (GetRecoParam()->MakeTrackCandidatesFast() && AliMUONTrackExtrap::IsFieldON()) {
- AliMUONTrackParam *trackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First();
- Double_t bendingMomentum = TMath::Abs(1. / trackParam->GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() || bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- }
+ // remove tracks out of limits
+ if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
}
}
// Keep only the best tracks if required
if (!GetRecoParam()->TrackAllTracks()) RemoveDoubleTracks();
- else if (GetRecoParam()->MakeTrackCandidatesFast() && AliMUONTrackExtrap::IsFieldON()) fRecTracksPtr->Compress();
+ else if (AliMUONTrackExtrap::IsFieldON()) fRecTracksPtr->Compress();
AliDebug(1,Form("Number of good candidates = %d",fNRecTracks));
}
// abort tracking if there are too many candidates
- if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ if ((fNRecTracks + segments->GetEntriesFast() - iSegment - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + segments->GetEntriesFast() - iSegment - 1));
delete segments;
return kFALSE;
}
RetraceTrack(*track,kTRUE);
// remove tracks with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- AliMUONTrackParam *trackParam = (AliMUONTrackParam*)track->GetTrackParamAtCluster()->First();
- Double_t bendingMomentum = TMath::Abs(1. / trackParam->GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() || bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) {
- fRecTracksPtr->Remove(track);
- fNRecTracks--;
- }
+ if (!IsAcceptable(*((AliMUONTrackParam*)track->GetTrackParamAtCluster()->First()))) {
+ fRecTracksPtr->Remove(track);
+ fNRecTracks--;
}
}
}
// abort tracking if there are too many candidates
- if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
- AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
- return kFALSE;
+ if (GetRecoParam()->RequestStation(station)) {
+ if (fNRecTracks > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks));
+ return kFALSE;
+ }
+ } else {
+ if ((fNRecTracks + currentNRecTracks - iRecTrack - 1) > GetRecoParam()->GetMaxTrackCandidates()) {
+ AliError(Form("Too many track candidates (%d tracks). Abort tracking.", fNRecTracks + currentNRecTracks - iRecTrack - 1));
+ return kFALSE;
+ }
}
}
/// 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
// Compute new track parameters including new cluster using kalman filter
addChi2TrackAtCluster = RunKalmanFilter(extrapTrackParamAtCluster);
- // skip track with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster.GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
- }
+ // skip track out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster)) continue;
// remember a cluster was found
foundOneCluster = kTRUE;
ch2 = 2*nextStation+1;
}
- Double_t bendingMomentum;
Double_t chi2OfCluster;
Double_t maxChi2OfCluster = 2. * GetRecoParam()->GetSigmaCutForTracking() *
GetRecoParam()->GetSigmaCutForTracking(); // 2 because 2 quantities in chi2
// Compute new track parameters including "clusterCh2" using kalman filter
addChi2TrackAtCluster2 = RunKalmanFilter(extrapTrackParamAtCluster2);
- // skip track with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster2.GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
- }
+ // skip track out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster2)) continue;
// Printout for debuging
if ((AliLog::GetDebugLevel("MUON","AliMUONTrackReconstructorK") >= 1) || (AliLog::GetGlobalDebugLevel() >= 1)) {
// Compute new track parameters including "clusterCh1" using kalman filter
addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1);
- // skip track with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster1.GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
- }
+ // skip track out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster1)) continue;
// remember a second cluster was found
foundSecondCluster = kTRUE;
// Compute new track parameters including "clusterCh1" using kalman filter
addChi2TrackAtCluster1 = RunKalmanFilter(extrapTrackParamAtCluster1);
- // skip track with absolute bending momentum out of limits
- if (AliMUONTrackExtrap::IsFieldON()) {
- bendingMomentum = TMath::Abs(1. / extrapTrackParamAtCluster1.GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
- }
+ // skip track out of limits
+ if (!IsAcceptable(extrapTrackParamAtCluster1)) continue;
// remember a cluster was found
foundOneCluster = kTRUE;
// 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
- if (AliMUONTrackExtrap::IsFieldON()) {
- Double_t bendingMomentum = TMath::Abs(1. / ((AliMUONTrackParam*)trackCandidate.GetTrackParamAtCluster()->First())->GetInverseBendingMomentum());
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) 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);
fRecTracksPtr(0x0),
fNRecTracks(0),
fClusterServer(clusterServer),
-fkRecoParam(recoParam)
+fkRecoParam(recoParam),
+fMaxMCSAngle2(0.)
{
/// Constructor for class AliMUONVTrackReconstructor
/// WARNING: if clusterServer=0x0, no clusterization will be possible at this level
// set the magnetic field for track extrapolations
AliMUONTrackExtrap::SetField();
+
+ // set the maximum MCS angle in chamber from the minimum acceptable momentum
+ AliMUONTrackParam param;
+ Double_t inverseBendingP = (GetRecoParam()->GetMinBendingMomentum() > 0.) ? 1./GetRecoParam()->GetMinBendingMomentum() : 1.;
+ param.SetInverseBendingMomentum(inverseBendingP);
+ fMaxMCSAngle2 = AliMUONTrackExtrap::GetMCSAngle2(param, AliMUONConstants::ChamberThicknessInX0(), 1.);
+
}
//__________________________________________________________________________
}
}
- //__________________________________________________________________________
+//__________________________________________________________________________
+Bool_t AliMUONVTrackReconstructor::IsAcceptable(AliMUONTrackParam &trackParam)
+{
+ /// Return kTRUE if the track is within given limits on momentum/angle/origin
+
+ const TMatrixD& kParamCov = trackParam.GetCovariances();
+ Int_t chamber = trackParam.GetClusterPtr()->GetChamberId();
+ Double_t z = trackParam.GetZ();
+ Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
+
+ // MCS dipersion
+ Double_t angleMCS2 = 0.;
+ if (AliMUONTrackExtrap::IsFieldON() && chamber < 6)
+ angleMCS2 = AliMUONTrackExtrap::GetMCSAngle2(trackParam, AliMUONConstants::ChamberThicknessInX0(), 1.);
+ else angleMCS2 = fMaxMCSAngle2;
+ Double_t impactMCS2 = 0.;
+ if (!GetRecoParam()->SelectOnTrackSlope()) for (Int_t iCh=0; iCh<=chamber; iCh++)
+ impactMCS2 += AliMUONConstants::DefaultChamberZ(chamber) * AliMUONConstants::DefaultChamberZ(chamber) * angleMCS2;
+
+ // ------ track selection in non bending direction ------
+ if (GetRecoParam()->SelectOnTrackSlope()) {
+
+ // check if non bending slope is within tolerances
+ Double_t nonBendingSlopeErr = TMath::Sqrt(kParamCov(1,1) + (chamber + 1.) * angleMCS2);
+ if ((TMath::Abs(trackParam.GetNonBendingSlope()) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) return kFALSE;
+
+ } else {
+
+ // or check if non bending impact parameter is within tolerances
+ Double_t nonBendingImpactParam = TMath::Abs(trackParam.GetNonBendingCoor() - z * trackParam.GetNonBendingSlope());
+ Double_t nonBendingImpactParamErr = TMath::Sqrt(kParamCov(0,0) + z * z * kParamCov(1,1) - 2. * z * kParamCov(0,1) + impactMCS2);
+ if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) return kFALSE;
+
+ }
+
+ // ------ track selection in bending direction ------
+ if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
+
+ // check if bending momentum is within tolerances
+ Double_t bendingMomentum = TMath::Abs(1. / trackParam.GetInverseBendingMomentum());
+ Double_t bendingMomentumErr = TMath::Sqrt(kParamCov(4,4)) * bendingMomentum * bendingMomentum;
+ if (chamber < 6 && (bendingMomentum + sigmaCut * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
+ else if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) return kFALSE;
+
+ } else {
+
+ if (GetRecoParam()->SelectOnTrackSlope()) {
+
+ // check if bending slope is within tolerances
+ Double_t bendingSlopeErr = TMath::Sqrt(kParamCov(3,3) + (chamber + 1.) * angleMCS2);
+ if ((TMath::Abs(trackParam.GetBendingSlope()) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) return kFALSE;
+
+ } else {
+
+ // or check if bending impact parameter is within tolerances
+ Double_t bendingImpactParam = TMath::Abs(trackParam.GetBendingCoor() - z * trackParam.GetBendingSlope());
+ Double_t bendingImpactParamErr = TMath::Sqrt(kParamCov(2,2) + z * z * kParamCov(3,3) - 2. * z * kParamCov(2,3) + impactMCS2);
+ if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) return kFALSE;
+
+ }
+
+ }
+
+ return kTRUE;
+
+}
+
+//__________________________________________________________________________
TClonesArray* AliMUONVTrackReconstructor::MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2)
{
/// To make the list of segments from the list of clusters in the 2 given chambers.
/// Return a new TClonesArray of segments.
/// It is the responsibility of the user to delete it afterward.
AliDebug(1,Form("Enter MakeSegmentsBetweenChambers (1..) %d-%d", ch1+1, ch2+1));
+ AliCodeTimerAuto("");
AliMUONVCluster *cluster1, *cluster2;
AliMUONObjectPair *segment;
- Double_t nonBendingSlope = 0, bendingSlope = 0, impactParam = 0., bendingMomentum = 0.; // to avoid compilation warning
+ Double_t z1 = 0., z2 = 0., dZ = 0.;
+ Double_t nonBendingSlope = 0., nonBendingSlopeErr = 0., nonBendingImpactParam = 0., nonBendingImpactParamErr = 0.;
+ Double_t bendingSlope = 0., bendingSlopeErr = 0., bendingImpactParam = 0., bendingImpactParamErr = 0., bendingImpactParamErr2 = 0.;
+ Double_t bendingMomentum = 0., bendingMomentumErr = 0.;
+ Double_t bendingVertexDispersion2 = GetRecoParam()->GetBendingVertexDispersion() * GetRecoParam()->GetBendingVertexDispersion();
+ Double_t impactMCS2 = 0; // maximum impact parameter dispersion**2 due to MCS in chamber
+ if (!GetRecoParam()->SelectOnTrackSlope() || AliMUONTrackExtrap::IsFieldON()) for (Int_t iCh=0; iCh<=ch1; iCh++)
+ impactMCS2 += AliMUONConstants::DefaultChamberZ(iCh) * AliMUONConstants::DefaultChamberZ(iCh) * fMaxMCSAngle2;
+ Double_t sigmaCut = GetRecoParam()->GetSigmaCutForTracking();
// Create iterators to loop over clusters in both chambers
TIter nextInCh1(clusterStore.CreateChamberIterator(ch1,ch1));
// Loop over clusters in the first chamber of the station
while ( ( cluster1 = static_cast<AliMUONVCluster*>(nextInCh1()) ) ) {
+ z1 = cluster1->GetZ();
// reset cluster iterator of chamber 2
nextInCh2.Reset();
// Loop over clusters in the second chamber of the station
while ( ( cluster2 = static_cast<AliMUONVCluster*>(nextInCh2()) ) ) {
+ z2 = cluster2->GetZ();
+ dZ = z1 - z2;
- // non bending slope
- nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / (cluster1->GetZ() - cluster2->GetZ());
-
- // check if non bending slope is within tolerances
- if (TMath::Abs(nonBendingSlope) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
-
- // bending slope
- bendingSlope = (cluster1->GetY() - cluster2->GetY()) / (cluster1->GetZ() - cluster2->GetZ());
-
- // check the bending momentum of the bending slope depending if the field is ON or OFF
- if (AliMUONTrackExtrap::IsFieldON()) {
+ // ------ track selection in non bending direction ------
+ nonBendingSlope = (cluster1->GetX() - cluster2->GetX()) / dZ;
+ if (GetRecoParam()->SelectOnTrackSlope()) {
+
+ // check if non bending slope is within tolerances
+ nonBendingSlopeErr = TMath::Sqrt((cluster1->GetErrX2() + cluster2->GetErrX2()) / dZ / dZ + (ch1 + 1.) * fMaxMCSAngle2);
+ if ((TMath::Abs(nonBendingSlope) - sigmaCut * nonBendingSlopeErr) > GetRecoParam()->GetMaxNonBendingSlope()) continue;
+
+ } else {
- // impact parameter
- impactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
+ // or check if non bending impact parameter is within tolerances
+ nonBendingImpactParam = TMath::Abs(cluster1->GetX() - cluster1->GetZ() * nonBendingSlope);
+ nonBendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrX2() + z2 * z2 * cluster1->GetErrX2()) / dZ / dZ + impactMCS2);
+ if ((nonBendingImpactParam - sigmaCut * nonBendingImpactParamErr) > (3. * GetRecoParam()->GetNonBendingVertexDispersion())) continue;
- // absolute value of bending momentum
- bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(impactParam));
+ }
+
+ // ------ track selection in bending direction ------
+ bendingSlope = (cluster1->GetY() - cluster2->GetY()) / dZ;
+ if (AliMUONTrackExtrap::IsFieldON()) { // depending whether the field is ON or OFF
// check if bending momentum is within tolerances
- if (bendingMomentum < GetRecoParam()->GetMinBendingMomentum() ||
- bendingMomentum > GetRecoParam()->GetMaxBendingMomentum()) continue;
+ bendingImpactParam = cluster1->GetY() - cluster1->GetZ() * bendingSlope;
+ bendingImpactParamErr2 = (z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2;
+ bendingMomentum = TMath::Abs(AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpactParam));
+ bendingMomentumErr = TMath::Sqrt((bendingVertexDispersion2 + bendingImpactParamErr2) /
+ bendingImpactParam / bendingImpactParam + 0.01) * bendingMomentum;
+ if ((bendingMomentum + 3. * bendingMomentumErr) < GetRecoParam()->GetMinBendingMomentum()) continue;
} else {
- // check if non bending slope is within tolerances
- if (TMath::Abs(bendingSlope) > GetRecoParam()->GetMaxBendingSlope()) continue;
-
+ if (GetRecoParam()->SelectOnTrackSlope()) {
+
+ // check if bending slope is within tolerances
+ bendingSlopeErr = TMath::Sqrt((cluster1->GetErrY2() + cluster2->GetErrY2()) / dZ / dZ + (ch1 + 1.) * fMaxMCSAngle2);
+ if ((TMath::Abs(bendingSlope) - sigmaCut * bendingSlopeErr) > GetRecoParam()->GetMaxBendingSlope()) continue;
+
+ } else {
+
+ // or check if bending impact parameter is within tolerances
+ bendingImpactParam = TMath::Abs(cluster1->GetY() - cluster1->GetZ() * bendingSlope);
+ bendingImpactParamErr = TMath::Sqrt((z1 * z1 * cluster2->GetErrY2() + z2 * z2 * cluster1->GetErrY2()) / dZ / dZ + impactMCS2);
+ if ((bendingImpactParam - sigmaCut * bendingImpactParamErr) > (3. * GetRecoParam()->GetBendingVertexDispersion())) continue;
+
+ }
+
}
+
// make new segment
segment = new ((*segments)[segments->GetLast()+1]) AliMUONObjectPair(cluster1, cluster2, kFALSE, kFALSE);
AliMUONTrackParam extrapTrackParam(trackParam);
AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, AliMUONConstants::DefaultChamberZ(chamber));
- // build the searching area using the track resolution and the maximum-distance-to-track value
+ // build the searching area using the track and chamber resolutions and the maximum-distance-to-track value
const TMatrixD& kParamCov = extrapTrackParam.GetCovariances();
- Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1));
- Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3));
+ Double_t errX2 = kParamCov(0,0) + kMaxDZ * kMaxDZ * kParamCov(1,1) + 2. * kMaxDZ * TMath::Abs(kParamCov(0,1)) +
+ GetRecoParam()->GetDefaultNonBendingReso(chamber) * GetRecoParam()->GetDefaultNonBendingReso(chamber);
+ Double_t errY2 = kParamCov(2,2) + kMaxDZ * kMaxDZ * kParamCov(3,3) + 2. * kMaxDZ * TMath::Abs(kParamCov(2,3)) +
+ GetRecoParam()->GetDefaultBendingReso(chamber) * GetRecoParam()->GetDefaultBendingReso(chamber);
Double_t dX = TMath::Abs(trackParam.GetNonBendingSlope()) * kMaxDZ +
GetRecoParam()->GetMaxNonBendingDistanceToTrack() +
- GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2);
+ GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2);
Double_t dY = TMath::Abs(trackParam.GetBendingSlope()) * kMaxDZ +
GetRecoParam()->GetMaxBendingDistanceToTrack() +
- GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2);
+ GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2);
AliMpArea area(extrapTrackParam.GetNonBendingCoor(),
extrapTrackParam.GetBendingCoor(),
dX, dY);
const TMatrixD& kParamCov = trackParamAtCluster.GetCovariances();
Double_t sigmaX2 = kParamCov(0,0) + cluster->GetErrX2();
Double_t sigmaY2 = kParamCov(2,2) + cluster->GetErrY2();
+ Double_t covXY = kParamCov(0,2);
+ Double_t det = sigmaX2 * sigmaY2 - covXY * covXY;
// Compute chi2
- return dX * dX / sigmaX2 + dY * dY / sigmaY2;
+ if (det == 0.) return 1.e10;
+ return (dX * dX * sigmaY2 + dY * dY * sigmaX2 - 2. * dX * dY * covXY) / det;
}
Bool_t AliMUONVTrackReconstructor::TryOneClusterFast(const AliMUONTrackParam &trackParam, const AliMUONVCluster* cluster)
{
/// Test the compatibility between the track and the cluster
-/// given the track resolution + the maximum-distance-to-track value
+/// given the track and cluster resolutions + the maximum-distance-to-track value
/// and assuming linear propagation of the track:
/// return kTRUE if they are compatibles
Double_t dX = cluster->GetX() - (trackParam.GetNonBendingCoor() + trackParam.GetNonBendingSlope() * dZ);
Double_t dY = cluster->GetY() - (trackParam.GetBendingCoor() + trackParam.GetBendingSlope() * dZ);
const TMatrixD& kParamCov = trackParam.GetCovariances();
- Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1);
- Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3);
+ Double_t errX2 = kParamCov(0,0) + dZ * dZ * kParamCov(1,1) + 2. * dZ * kParamCov(0,1) + cluster->GetErrX2();
+ Double_t errY2 = kParamCov(2,2) + dZ * dZ * kParamCov(3,3) + 2. * dZ * kParamCov(2,3) + cluster->GetErrY2();
- Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errX2) +
+ Double_t dXmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errX2) +
GetRecoParam()->GetMaxNonBendingDistanceToTrack();
- Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(errY2) +
+ Double_t dYmax = GetRecoParam()->GetSigmaCutForTracking() * TMath::Sqrt(2. * errY2) +
GetRecoParam()->GetMaxBendingDistanceToTrack();
if (TMath::Abs(dX) > dXmax || TMath::Abs(dY) > dYmax) return kFALSE;
const AliMUONRecoParam* fkRecoParam; ///< reference to reco parameters
+ Double_t fMaxMCSAngle2; ///< maximum angle dispersion due to MCS
+
// Functions
AliMUONVTrackReconstructor (const AliMUONVTrackReconstructor& rhs); ///< copy constructor
AliMUONVTrackReconstructor& operator=(const AliMUONVTrackReconstructor& rhs); ///< assignment operator
/// Finalize the given track
virtual void FinalizeTrack(AliMUONTrack &track) = 0;
+ Bool_t IsAcceptable(AliMUONTrackParam &trackParam);
+
TClonesArray* MakeSegmentsBetweenChambers(const AliMUONVClusterStore& clusterStore, Int_t ch1, Int_t ch2);
void RemoveUsedSegments(TClonesArray& segments);
muonRecoParam->SetCalibrationMode(caliboption.Data());
// cut on (non)bending slopes
- muonRecoParam->SetMaxNonBendingSlope(0.6);
- muonRecoParam->SetMaxBendingSlope(0.6);
+ muonRecoParam->SetMaxNonBendingSlope(0.4);
+ muonRecoParam->SetMaxBendingSlope(0.5);
// tracking algorithm
muonRecoParam->MakeMoreTrackCandidates(kTRUE);
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff