#include "AliMUONTrack.h"
+#include "AliMUONReconstructor.h"
+#include "AliMUONRecoParam.h"
#include "AliMUONVCluster.h"
#include "AliMUONVClusterStore.h"
#include "AliMUONObjectPair.h"
fVertexErrXY2[1] = 0.;
// Pointers to clusters from the segment
- AliMUONVCluster* cluster1 = (AliMUONVCluster*) segment->First();
- AliMUONVCluster* cluster2 = (AliMUONVCluster*) segment->Second();
-
- // check sorting in -Z (spectro z<0)
- if (cluster1->GetZ() < cluster2->GetZ()) {
- cluster1 = cluster2;
- cluster2 = (AliMUONVCluster*) segment->First();
- }
-
- // order the clusters into the track according to the station the segment belong to
- // to anticipate the direction of propagation in the first tracking step
- // (go backward if the segment is on the last station / go forward otherwise)
- AliMUONVCluster *firstCluster, *lastCluster;
- if (cluster1->GetChamberId() == 8) { // last station
- firstCluster = cluster1;
- lastCluster = cluster2;
- } else {
- firstCluster = cluster2;
- lastCluster = cluster1;
- }
+ AliMUONVCluster* firstCluster = (AliMUONVCluster*) segment->First();
+ AliMUONVCluster* lastCluster = (AliMUONVCluster*) segment->Second();
// Compute track parameters
Double_t z1 = firstCluster->GetZ();
Double_t bendingImpact = bendingCoor1 - z1 * bendingSlope;
Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact);
-
- // Set track parameters at first cluster (needed by any tracking algorithm)
+ // Set track parameters at first cluster
AliMUONTrackParam trackParamAtFirstCluster;
trackParamAtFirstCluster.SetZ(z1);
trackParamAtFirstCluster.SetNonBendingCoor(nonBendingCoor1);
trackParamAtFirstCluster.SetBendingSlope(bendingSlope);
trackParamAtFirstCluster.SetInverseBendingMomentum(inverseBendingMomentum);
-
- // Set track parameters at last cluster (used by Kalman only)
+ // Set track parameters at last cluster
AliMUONTrackParam trackParamAtLastCluster;
trackParamAtLastCluster.SetZ(z2);
trackParamAtLastCluster.SetNonBendingCoor(nonBendingCoor2);
trackParamAtLastCluster.SetBendingSlope(bendingSlope);
trackParamAtLastCluster.SetInverseBendingMomentum(inverseBendingMomentum);
-
- // Compute and set track parameters covariances at first cluster (needed by any tracking algorithm)
- TMatrixD paramCov1(5,5);
- paramCov1.Zero();
+ // Compute and set track parameters covariances at first cluster
+ TMatrixD paramCov(5,5);
+ paramCov.Zero();
// Non bending plane
- paramCov1(0,0) = firstCluster->GetErrX2();
- paramCov1(0,1) = firstCluster->GetErrX2() / dZ;
- paramCov1(1,0) = paramCov1(0,1);
- paramCov1(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ;
+ paramCov(0,0) = firstCluster->GetErrX2();
+ paramCov(0,1) = firstCluster->GetErrX2() / dZ;
+ paramCov(1,0) = paramCov(0,1);
+ paramCov(1,1) = ( firstCluster->GetErrX2() + lastCluster->GetErrX2() ) / dZ / dZ;
// Bending plane
- paramCov1(2,2) = firstCluster->GetErrY2();
- paramCov1(2,3) = firstCluster->GetErrY2() / dZ;
- paramCov1(3,2) = paramCov1(2,3);
- paramCov1(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ;
- // Inverse bending momentum (50% error)
- paramCov1(4,4) = 0.5*inverseBendingMomentum * 0.5*inverseBendingMomentum;
- // Set covariances
- trackParamAtFirstCluster.SetCovariances(paramCov1);
+ paramCov(2,2) = firstCluster->GetErrY2();
+ paramCov(2,3) = firstCluster->GetErrY2() / dZ;
+ paramCov(3,2) = paramCov(2,3);
+ paramCov(3,3) = ( firstCluster->GetErrY2() + lastCluster->GetErrY2() ) / dZ / dZ;
+ // Inverse bending momentum (vertex resolution + bending slope resolution + 10% error on dipole parameters+field)
+ paramCov(4,4) = ((AliMUONReconstructor::GetRecoParam()->GetBendingVertexDispersion() *
+ AliMUONReconstructor::GetRecoParam()->GetBendingVertexDispersion() +
+ (z1 * z1 * lastCluster->GetErrY2() + z2 * z2 * firstCluster->GetErrY2()) / dZ / dZ) /
+ bendingImpact / bendingImpact + 0.1 * 0.1) * inverseBendingMomentum * inverseBendingMomentum;
+ paramCov(2,4) = - z2 * firstCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ paramCov(4,2) = paramCov(2,4);
+ paramCov(3,4) = - (z1 * lastCluster->GetErrY2() + z2 * firstCluster->GetErrY2()) * inverseBendingMomentum / bendingImpact / dZ / dZ;
+ paramCov(4,3) = paramCov(3,4);
-
- // Compute and set track parameters covariances at last cluster as if the first cluster did not exist (used by Kalman only)
- TMatrixD paramCov2(5,5);
- paramCov2.Zero();
- // Non bending plane
- paramCov2(0,0) = paramCov1(0,0);
- paramCov2(1,1) = 100.*paramCov1(1,1);
- // Bending plane
- paramCov2(2,2) = paramCov1(2,2);
- paramCov2(3,3) = 100.*paramCov1(3,3);
- // Inverse bending momentum
- paramCov2(4,4) = paramCov1(4,4);
// Set covariances
- trackParamAtLastCluster.SetCovariances(paramCov2);
+ trackParamAtFirstCluster.SetCovariances(paramCov);
- // Flag clusters as being removable
- trackParamAtFirstCluster.SetRemovable(kTRUE);
- trackParamAtLastCluster.SetRemovable(kTRUE);
+ // Compute and set track parameters covariances at last cluster
+ paramCov(1,0) = - paramCov(1,0);
+ paramCov(0,1) = - paramCov(0,1);
+ paramCov(3,2) = - paramCov(3,2);
+ paramCov(2,3) = - paramCov(2,3);
+ paramCov(2,4) = z1 * lastCluster->GetErrY2() * inverseBendingMomentum / bendingImpact / dZ;
+ paramCov(4,2) = paramCov(2,4);
+ trackParamAtLastCluster.SetCovariances(paramCov);
// Add track parameters at clusters
AddTrackParamAtCluster(trackParamAtFirstCluster,*firstCluster);
//__________________________________________________________________________
Bool_t AliMUONTrack::IsValid()
{
- /// check the validity of the current track (at least one cluster per station)
+ /// check the validity of the current track (at least one cluster per requested station)
Int_t nClusters = GetNClusters();
AliMUONTrackParam *trackParam;
for (Int_t i = 0; i < nClusters; i++) {
trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
+ // skip unrequested stations
+ while (expectedStation < AliMUONConstants::NTrackingSt() &&
+ !AliMUONReconstructor::GetRecoParam()->RequestStation(expectedStation)) expectedStation++;
+
currentStation = trackParam->GetClusterPtr()->GetChamberId()/2;
// missing station
}
- return currentStation == AliMUONConstants::NTrackingSt() - 1;
+ return expectedStation == AliMUONConstants::NTrackingSt();
}
//__________________________________________________________________________
void AliMUONTrack::TagRemovableClusters() {
/// Identify clusters that can be removed from the track,
- /// with the only requirement to have at least 1 cluster per station
+ /// with the only requirement to have at least 1 cluster per requested station
Int_t nClusters = GetNClusters();
AliMUONTrackParam *trackParam, *nextTrackParam;
Int_t currentCh, nextCh;
- // reset flags to default
+ // reset flags to kFALSE for all clusters in required station
for (Int_t i = 0; i < nClusters; i++) {
trackParam = (AliMUONTrackParam*) fTrackParamAtCluster->UncheckedAt(i);
- trackParam->SetRemovable(kFALSE);
+ if (AliMUONReconstructor::GetRecoParam()->RequestStation(trackParam->GetClusterPtr()->GetChamberId()/2))
+ trackParam->SetRemovable(kFALSE);
+ else trackParam->SetRemovable(kTRUE);
}
// loop over track parameters
Double_t numberOfDegFree = (2. * GetNClusters() - 5.);
if (numberOfDegFree > 0.) return fGlobalChi2 / numberOfDegFree;
- else return 1.e10;
+ else return fGlobalChi2; // system is under-constraint
}
//__________________________________________________________________________
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff