#include <GsfVertexTrackCompatibilityEstimator.h>

Inheritance diagram for GsfVertexTrackCompatibilityEstimator:

Public Types
typedef CachingVertex < 5 >::RefCountedVertexTrack	RefCountedVertexTrack

Public Types inherited from VertexTrackCompatibilityEstimator< 5 >
typedef std::pair< bool, double >	BDpair

typedef VertexTrack< N > ::RefCountedLinearizedTrackState	RefCountedLinearizedTrackState

typedef CachingVertex< N > ::RefCountedVertexTrack	RefCountedVertexTrack

Public Member Functions
virtual GsfVertexTrackCompatibilityEstimator *	clone () const

virtual BDpair	estimate (const CachingVertex< 5 > &vrt, const RefCountedVertexTrack track) const

virtual BDpair	estimate (const CachingVertex< 5 > &v, const RefCountedLinearizedTrackState track) const

virtual BDpair	estimate (const reco::Vertex &vertex, const reco::TransientTrack &track) const

	GsfVertexTrackCompatibilityEstimator ()

virtual	~GsfVertexTrackCompatibilityEstimator ()

Public Member Functions inherited from VertexTrackCompatibilityEstimator< 5 >
virtual BDpair	estimate (const CachingVertex< N > &v, const RefCountedLinearizedTrackState track) const =0

virtual BDpair	estimate (const CachingVertex< N > &v, const RefCountedVertexTrack track) const =0

	VertexTrackCompatibilityEstimator ()

virtual	~VertexTrackCompatibilityEstimator ()

Private Member Functions
BDpair	estimateFittedTrack (const CachingVertex< 5 > &v, const RefCountedVertexTrack track) const

BDpair	estimateNFittedTrack (const CachingVertex< 5 > &v, const RefCountedVertexTrack track) const

Private Attributes
MultiPerigeeLTSFactory	lTrackFactory

GsfVertexUpdator	updator

VertexTrackFactory< 5 >	vTrackFactory

Detailed Description

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 GsfVertexTrackCompatibilityEstimator.h.

Member Typedef Documentation

typedef CachingVertex<5>::RefCountedVertexTrack GsfVertexTrackCompatibilityEstimator::RefCountedVertexTrack

Definition at line 30 of file GsfVertexTrackCompatibilityEstimator.h.

Constructor & Destructor Documentation

GsfVertexTrackCompatibilityEstimator::GsfVertexTrackCompatibilityEstimator ( )

inline

Definition at line 32 of file GsfVertexTrackCompatibilityEstimator.h.

Referenced by clone().

32 {}

virtual GsfVertexTrackCompatibilityEstimator::~GsfVertexTrackCompatibilityEstimator ( )

inlinevirtual

Definition at line 34 of file GsfVertexTrackCompatibilityEstimator.h.

34 {}

Member Function Documentation

virtual GsfVertexTrackCompatibilityEstimator* GsfVertexTrackCompatibilityEstimator::clone ( void ) const

inlinevirtual

Clone method

Implements VertexTrackCompatibilityEstimator< 5 >.

Definition at line 52 of file GsfVertexTrackCompatibilityEstimator.h.

References GsfVertexTrackCompatibilityEstimator().

   {
     return new GsfVertexTrackCompatibilityEstimator(* this);
   }

std::pair< bool, double > GsfVertexTrackCompatibilityEstimator::estimate	(	const CachingVertex< 5 > &	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.

Definition at line 22 of file GsfVertexTrackCompatibilityEstimator.cc.

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

 {
 //checking if the track passed really belongs to the vertex
   std::vector<RefCountedVertexTrack> tracks = vertex.tracks();
   std::vector<RefCountedVertexTrack>::iterator pos 
     = find_if(tracks.begin(), tracks.end(), VertexTrackEqual<5>(tr));
  if (pos != tracks.end()) {
    return estimateFittedTrack(vertex,*pos);
  } else {
    return estimateNFittedTrack(vertex,tr);
  }
 } 

std::pair< bool, double > GsfVertexTrackCompatibilityEstimator::estimate	(	const CachingVertex< 5 > &	v,
		const RefCountedLinearizedTrackState	track
	)		const

virtual

Definition at line 38 of file GsfVertexTrackCompatibilityEstimator.cc.

References CachingVertex< N >::vertexState().

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

std::pair< bool, double > GsfVertexTrackCompatibilityEstimator::estimate	(	const reco::Vertex &	vertex,
		const reco::TransientTrack &	track
	)		const

virtual

Implements VertexTrackCompatibilityEstimator< 5 >.

Definition at line 48 of file GsfVertexTrackCompatibilityEstimator.cc.

References reco::Vertex::chi2(), reco::Vertex::covariance(), spr::find(), 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()));
 
   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<5> cachingVertex(linP, err, initialTracks,
                 vertex.chi2());
   // FIXME: this should work also for tracks without a persistent ref.
 //   const TrackTransientTrack* ttt = dynamic_cast<const TrackTransientTrack*>(track.basicTransientTrack());
 //   if ((ttt!=0) && 
   if (find(vertex.tracks_begin(), vertex.tracks_end(), track.trackBaseRef()) != vertex.tracks_end())
   {
     return estimateFittedTrack(cachingVertex, vertexTrack);
   } else {
     return estimateNFittedTrack(cachingVertex, vertexTrack);
   }
 }

std::pair< bool, double > GsfVertexTrackCompatibilityEstimator::estimateFittedTrack	(	const CachingVertex< 5 > &	v,
		const RefCountedVertexTrack	track
	)		const

private

Definition at line 81 of file GsfVertexTrackCompatibilityEstimator.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.
   if (track->refittedStateAvailable()) return BDpair(true, track->smoothedChi2());
   throw VertexException
     ("GsfVertexTrackCompatibilityEstimator::vertex has to be smoothed.");
 
 //   CachingVertex rVert = updator.remove(v, track);
 //   RefCountedVertexTrack newSmoothedTrack = trackUpdator.update(v, track);
 //   return estimateDifference(v,rVert,newSmoothedTrack);
 }

std::pair< bool, double > GsfVertexTrackCompatibilityEstimator::estimateNFittedTrack	(	const CachingVertex< 5 > &	v,
		const RefCountedVertexTrack	track
	)		const

private

Definition at line 99 of file GsfVertexTrackCompatibilityEstimator.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<5> rVert = updator.add(v, track);
   if (!rVert.isValid()) return BDpair(false,-1.);
   return BDpair(true, rVert.totalChiSquared()-v.totalChiSquared());
 }   