interface for tools taking a two-track vertex and creating a neutral track from it. More...

#include <INeutralParticleParameterCalculator.h>

Inheritance diagram for Trk::INeutralParticleParameterCalculator:

Collaboration diagram for Trk::INeutralParticleParameterCalculator:

Public Member Functions
virtual NeutralPerigee *	createNeutralTrackFromVertex (const xAOD::Vertex &) const =0
	method calculating the parameters

Static Public Member Functions
static const InterfaceID &	interfaceID ()

Detailed Description

interface for tools taking a two-track vertex and creating a neutral track from it.

If the vertex is an extended vertex, it uses the full vertex-to-track covariance matrix (constrained vertex fit), if not, then it assumes all the correlations come simply from the fact that a common vertex is fit (unconstrained vertex fit), and reconstructs back the vertex-to-track correlations from the vertex and track cov. matrices. The former is used in egamma, while in JetFitter the latter is used.