#include <KalmanVertexTrackCompatibilityEstimator.h>

Inheritance diagram for KalmanVertexTrackCompatibilityEstimator< N >:

Public Types
typedef std::pair< bool, double >	BDpair
typedef VertexTrack< N > ::RefCountedLinearizedTrackState	RefCountedLinearizedTrackState
typedef VertexTrack< N > ::RefCountedRefittedTrackState	RefCountedRefittedTrackState
typedef CachingVertex< N > ::RefCountedVertexTrack	RefCountedVertexTrack
Public Member Functions
virtual KalmanVertexTrackCompatibilityEstimator < N > *	clone () const
virtual BDpair	estimate (const CachingVertex< N > &v, const RefCountedLinearizedTrackState track) const
virtual BDpair	estimate (const reco::Vertex &vertex, const reco::TransientTrack &track) const
virtual BDpair	estimate (const CachingVertex< N > &vrt, const RefCountedVertexTrack track) const
	KalmanVertexTrackCompatibilityEstimator ()
virtual	~KalmanVertexTrackCompatibilityEstimator ()
Private Member Functions
BDpair	estimateDifference (const CachingVertex< N > &more, const CachingVertex< N > &less, const RefCountedVertexTrack track) const
BDpair	estimateFittedTrack (const CachingVertex< N > &v, const RefCountedVertexTrack track) const
BDpair	estimateNFittedTrack (const CachingVertex< N > &v, const RefCountedVertexTrack track) const
Private Attributes
KVFHelper< N >	helper
KalmanVertexTrackUpdator< N >	trackUpdator
KalmanVertexUpdator< N >	updator
VertexTrackFactory< N >	vTrackFactory

Detailed Description

template<unsigned int N>
class KalmanVertexTrackCompatibilityEstimator< N >

Calculates the compatiblity of a track with respect to a vertex using the Kalman filter algorithms. The compatibility is computed from the squared standardized residuals between the track and the vertex. If track and vertex errors are Gaussian and correct, this quantity is distributed as chi**2(ndf=2)). Can be used to identify outlying tracks.

Definition at line 25 of file KalmanVertexTrackCompatibilityEstimator.h.

Member Typedef Documentation

template<unsigned int N>

typedef std::pair<bool, double> KalmanVertexTrackCompatibilityEstimator< N >::BDpair

Reimplemented from VertexTrackCompatibilityEstimator< N >.

Definition at line 33 of file KalmanVertexTrackCompatibilityEstimator.h.

template<unsigned int N>

typedef VertexTrack<N>::RefCountedLinearizedTrackState KalmanVertexTrackCompatibilityEstimator< N >::RefCountedLinearizedTrackState

Reimplemented from VertexTrackCompatibilityEstimator< N >.

Definition at line 31 of file KalmanVertexTrackCompatibilityEstimator.h.

template<unsigned int N>

typedef VertexTrack<N>::RefCountedRefittedTrackState KalmanVertexTrackCompatibilityEstimator< N >::RefCountedRefittedTrackState

Definition at line 32 of file KalmanVertexTrackCompatibilityEstimator.h.

template<unsigned int N>

typedef CachingVertex<N>::RefCountedVertexTrack KalmanVertexTrackCompatibilityEstimator< N >::RefCountedVertexTrack

Reimplemented from VertexTrackCompatibilityEstimator< N >.

Definition at line 30 of file KalmanVertexTrackCompatibilityEstimator.h.

Constructor & Destructor Documentation

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::KalmanVertexTrackCompatibilityEstimator ( ) [inline]

Definition at line 35 of file KalmanVertexTrackCompatibilityEstimator.h.

Referenced by KalmanVertexTrackCompatibilityEstimator< N >::clone().

{}

template<unsigned int N>

virtual KalmanVertexTrackCompatibilityEstimator< N >::~KalmanVertexTrackCompatibilityEstimator ( ) [inline, virtual]

Definition at line 37 of file KalmanVertexTrackCompatibilityEstimator.h.

{}

Member Function Documentation

template<unsigned int N>

virtual KalmanVertexTrackCompatibilityEstimator<N>* KalmanVertexTrackCompatibilityEstimator< N >::clone ( ) const [inline, virtual]

Clone method

Implements VertexTrackCompatibilityEstimator< N >.

Definition at line 55 of file KalmanVertexTrackCompatibilityEstimator.h.

References KalmanVertexTrackCompatibilityEstimator< N >::KalmanVertexTrackCompatibilityEstimator().

  {
    return new KalmanVertexTrackCompatibilityEstimator(* this);
  }

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::BDpair KalmanVertexTrackCompatibilityEstimator< N >::estimate	(	const CachingVertex< N > &	vrt,
		const RefCountedVertexTrack	track
	)		const `[virtual]`

Track-to-vertex compatibility. The track weight is taken into account.

Parameters:

track	The track for which the chi**2 has to be estimated.
v	The vertex against which the chi**2 has to be estimated.

Returns:: The chi**2.

Implements VertexTrackCompatibilityEstimator< N >.

Definition at line 10 of file KalmanVertexTrackCompatibilityEstimator.cc.

References pos, CachingVertex< N >::tracks(), and testEve_cfg::tracks.

Referenced by MultiVertexFitter::updateWeights().

{
//checking if the track passed really belongs to the vertex
  std::vector<RefCountedVertexTrack> tracks = vertex.tracks();
  typename std::vector<RefCountedVertexTrack>::iterator pos 
    = find_if(tracks.begin(), tracks.end(), VertexTrackEqual<N>(tr));
 if(pos != tracks.end()) {
   return estimateFittedTrack(vertex,*pos);
 } else {
   return estimateNFittedTrack(vertex,tr);
 }
}

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::BDpair KalmanVertexTrackCompatibilityEstimator< N >::estimate	(	const CachingVertex< N > &	v,
		const RefCountedLinearizedTrackState	track
	)		const `[virtual]`

Methods giving back the compatibility estimation

Implements VertexTrackCompatibilityEstimator< N >.

Definition at line 27 of file KalmanVertexTrackCompatibilityEstimator.cc.

References CachingVertex< N >::vertexState().

{
  RefCountedVertexTrack vertexTrack = vTrackFactory.vertexTrack(track,
                                                 vertex.vertexState());
  return estimate(vertex, vertexTrack);
}

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::BDpair KalmanVertexTrackCompatibilityEstimator< N >::estimate	(	const reco::Vertex &	vertex,
		const reco::TransientTrack &	track
	)		const `[virtual]`

Implements VertexTrackCompatibilityEstimator< N >.

Definition at line 38 of file KalmanVertexTrackCompatibilityEstimator.cc.

References reco::Vertex::chi2(), reco::Vertex::covariance(), spr::find(), LinearizedTrackStateFactory::linearizedTrackState(), reco::Vertex::position(), reco::TransientTrack::trackBaseRef(), reco::Vertex::tracks_begin(), and reco::Vertex::tracks_end().

{       
//   GlobalPoint linP(vertex.position().x(), vertex.position().z(),vertex.position().z());
    GlobalPoint linP(Basic3DVector<float> (vertex.position()));

  LinearizedTrackStateFactory lTrackFactory;
  RefCountedLinearizedTrackState linTrack = 
                        lTrackFactory.linearizedTrackState(linP, track);
  GlobalError err(vertex.covariance());
  VertexState vState(linP, err);
  RefCountedVertexTrack vertexTrack = vTrackFactory.vertexTrack(linTrack, vState);

  std::vector<RefCountedVertexTrack> initialTracks(1, vertexTrack);
  CachingVertex<N> cachingVertex(linP, err, initialTracks,
                            vertex.chi2());
  // FIXME: this should work also for tracks without a persistent ref.
//   return estimateNFittedTrack(cachingVertex, vertexTrack);
  if (find(vertex.tracks_begin(), vertex.tracks_end(), track.trackBaseRef()) != vertex.tracks_end())
  {
    return estimateFittedTrack(cachingVertex, vertexTrack);
  } else {
    return estimateNFittedTrack(cachingVertex, vertexTrack);
  }
}

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::BDpair KalmanVertexTrackCompatibilityEstimator< N >::estimateDifference	(	const CachingVertex< N > &	more,
		const CachingVertex< N > &	less,
		const RefCountedVertexTrack	track
	)		const `[private]`

Definition at line 103 of file KalmanVertexTrackCompatibilityEstimator.cc.

{
  BDpair trackRes = helper.trackParameterChi2(track);
  return BDpair(trackRes.first, trackRes.second + helper.vertexChi2(less, more)) ;
}

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::BDpair KalmanVertexTrackCompatibilityEstimator< N >::estimateFittedTrack	(	const CachingVertex< N > &	v,
		const RefCountedVertexTrack	track
	)		const `[private]`

Definition at line 72 of file KalmanVertexTrackCompatibilityEstimator.cc.

{
  //remove track from the vertex using the vertex updator
  // Using the update instead of the remove methode, we can specify a weight which
  // is different than then one which the vertex track has been defined with.
  //CachingVertex rVert = updator.remove(v, track);
  RefCountedVertexTrack newSmoothedTrack = trackUpdator.update(v, track);
//   std::cout << newSmoothedTrack->smoothedChi2()<<" "<<estimateDifference(v,rVert,newSmoothedTrack)<<std::endl;
//   return estimateDifference(v,rVert,newSmoothedTrack);
  return BDpair(true, newSmoothedTrack->smoothedChi2());
}

template<unsigned int N>

KalmanVertexTrackCompatibilityEstimator< N >::BDpair KalmanVertexTrackCompatibilityEstimator< N >::estimateNFittedTrack	(	const CachingVertex< N > &	v,
		const RefCountedVertexTrack	track
	)		const `[private]`

Definition at line 89 of file KalmanVertexTrackCompatibilityEstimator.cc.

References CachingVertex< N >::isValid(), and CachingVertex< N >::totalChiSquared().

{
  // Using the update instead of the add methode, we can specify a weight which
  // is different than then one which the vertex track has been defined with.
  CachingVertex<N> rVert = updator.add(v, track);
  if (!rVert.isValid()) return BDpair(false,-1.);
  return BDpair(true, rVert.totalChiSquared()-v.totalChiSquared());
}