DOI: 10.1140/epjc/s2003-01441-8
b-tagging in DELPHI at LEP
The DELPHI Collaboration(Received: 14 January 2003 / Revised version: 14 October 2003 / / Published online: 3 December 2003)
Abstract
The standard method used for tagging
b-hadrons in the DELPHI experiment at
the CERN LEP Collider is discussed in detail. The main ingredient of
b-tagging is the impact parameters of tracks, which relies mostly on the
vertex detector. Additional information, such as the mass of particles
associated to a secondary vertex, significantly improves the selection
efficiency and the background suppression. The paper describes various
discriminating variables used for the tagging and the procedure of their
combination. In addition, applications of
b-tagging to some physics
analyses, which depend crucially on the performance and reliability of
b-tagging, are described briefly.
© Società Italiana di Fisica, Springer-Verlag 2004
