class AtlBTag: public TObject

 Atlas B-tagger class

 Basically the tag weight and a validity flag is stored for each
 tagger. For some taggers some additinoal information is stored. In
 detail:

   * Impact paramter 2d/3d
       - number of tracks
       - b/u likelihoods

   * SV1 and SV2
       - b/u likelihoods

   * SVInfoPlus and SV0InfoPlus
       - invariant mass at sec. vertex
       - number of 2-track vertices
       - flag for good vertex
       - total number of tracks
       - number of good tracks at vertex
       - number of good tracks in jet
       - energy fraction sec. vtx/jet of charged tracks

   * JetFitterTag
       - b/u likelihoods
       - number of vertices with more than one track
       - number of single-track vertices
       - number of tracks at vertices (with more than one track - sum)
       - invariant mass of the tracks fitted to the vertices with at least 2 tracks
       - energy fraction sec. vtx/jet of charged tracks
       - 3-dim significance of all vertices with more than one track or -if not there-
       - delta(phi) between sum of all momenta at vertices and the fitted B-meson flight direction
       - delta(eta) between sum of all momenta at vertices and the fitted B-meson flight direction


 Author: Oliver Maria Kind <mailto: kind@physik.hu-berlin.de>
 Update: $Id: AtlBTag.cxx,v 1.28 2016/09/30 14:41:45 mergelm Exp $
 Copyright: 2009 (C) Oliver Maria Kind