Relations between ΔM_{s,d} and B_{s,d}\to μ\barμin Models with Minimal Flavour Violation

Abstract

The predictions for the B_{s,d}-\bar B_{s,d} mixing mass differences ΔM_{s,d} and Br(B_{s,d}\toμ\barμ) within the Standard Model (SM) and its extensions suffer from considerable hadronic uncertainties present in the B_{s,d}-meson decay constants F_{B_{s,d}} that enter these quantities quadratically. We point out that in the restricted class of models with minimal flavour violation (MFV) in which only the SM low energy operators are relevant, the ratios Br(B_{q}\toμ\barμ)/ΔM_q (q=s,d) do not depend on F_{B_{q}} and the CKM matrix elements. They involve in addition to the short distance functions and B-meson lifetimes only the non-perturbative parameters \hat B_{s,d}. The latter are under much better control than F_{B_{s,d}}. Consequently in these models the predictions for Br(B_{q}\toμ\barμ) have only small hadronic uncertainties once ΔM_q are experimentally known. Of particular interest is also the relation Br(B_{s}\toμ\barμ)/Br(B_{d}\toμ\barμ)=\hat B_{d}/\hat B_{s} τ(B_{s})/τ(B_{d}) ΔM_{s}/ΔM_{d} that is practically free of theoretical uncertainties as \hat B_{s}/\hat B_{d}=1 up to small SU(3) breaking corrections. Using these ideas within the SM we find much more accurate predictions than those found in the literature: Br(B_{s}\toμ\barμ)=(3.4\pm 0.5)\cdot 10^{-9} and Br(B_{d}\toμ\barμ)=(1.00\pm 0.14)\cdot 10^{-10} were in the first case we assumed as an example ΔM_s=(18.0\pm 0.5)/ps.

Main latex-file, no figures, 7 pages

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