Speaker
Gordon Watts
(DZERO Collaboration)
Description
DØ, one of the collider detectors at Fermilab's Tevatron, depends on efficient and
pure b-quark identification for much of its high-pT physics program. DØ currently has
two algorithms, one based on impact parameter and the other on explicit
reconstruction of the B hadrons decay vertex. A third, combined algorithm is under
development. DØ certifies all of its b-quark tagging algorithms before they can be
used in an analysis: this involves determining efficiencies, fake rates, and, most
difficultly, systematic errors. Determining these with enough accuracy requires
running over millions of events. There is also a ROOT based infrastructure used by
the collaboration to run the various algorithms and correctly compute fake rates and
expected efficiencies as well as present basic performance plots. We will present an
overview of the algorithms and tools, how the efficiencies are calculated, and the
design of some of the more complex parts of the system.
Author
Gordon Watts
(DZERO Collaboration)
