Neutral B Meson Mixing and Decay Constants from Lattice QCD

Abstract

We present updates of our results for neutral $B$-meson mixing and leptonic decay constants obtained in the quenched approximation from a mean-field-improved Sheikholeslami-Wohlert action at two values of lattice spacing. We consider quantities such as $B_{B_{d(s)}}$, $f_{D_{(s)}}$, $f_{B_{(s)}}$ and the full $\Delta B=2$ matrix-elements, as well as the corresponding SU(3)-breaking ratios.

Comments: Contribution to the Heavy Flavours 8 conference, Southampton, UK, July, 1999. Revised version. Typos in equations (1.2) and (1.3) corrected. Very small changes to text. Results unchanged