B-Bbar Mixing and Matching with Fermilab Heavy Quarks

Abstract

We discuss the matching procedure for heavy-light 4-quark operators using the Fermilab method for heavy quarks and staggered fermions for light quarks. These ingredients enable us to construct the continuum-limit operator needed to determine the oscillation frequency of neutral B mesons. The matching is then carried out at the one-loop level. We also present an updated preliminary result for the SU(3)-breaking ratio \xi, based on calculations using the MILC Collaboration's ensembles of lattice gauge fields.

Comments: 7 pp., 2 plots in 1 figure. Prepared for Lattice 2009, 26-31 July 2009, Beijing, China. To appear as PoS LATTICE 2009, 245 (2009)