Abstract
In the limit of infinitely heavy b-quarks we compute the SU(3)-breaking ratio x of neutral Bmeson mixing matrix elemts. We also present results for the ratio of decay constants fBs=fBd . Our calculation employs chirality-preserving domain-wall fermions for the light quarks, a static action with link-smearing for the b-quarks, and the Iwasaki gauge action. Here we report on our results from the 16 3 32 16 ensemble (a 1 = 1:729(28) GeV) which we use to verify our method. We improve upon our earlier work by including O(aspa) matching for the computation of the decay constants and extrapolating to the physical point using chiral perturbation theory.
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