Abstract
We re-examine the theoretical uncertainty in the Standard Model expression for B 0– B 0 mixing. We focus on lattice calculations of the ratio ξ, needed to relate the oscillation frequency of B 0 s – B 0 s mixing to the poorly known CKM element V td . We replace the usual linear chiral extrapolation with one that includes the logarithm that appears in chiral perturbation theory. We find a significant shift in the ratio ξ, from the conventional 1.15±0.05 to ξ=1.32±0.10.
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