Phenomenology of B Xs
نویسنده
چکیده
We present a brief review of the status and phenomenology of B Xs decays. The B Xs rate is known at the next-to-next-to-leading order in QCD and NLO in QED. QED corrections include only log-enhanced corrections of the type αem ln M2 W mb and αem ln m 2 b m 2 . The latter originate from a collinear singularity, they vanish when integrated over the whole phase space but survive the integration over the low dilepton invariant mass region 1 GeV2 m2 6 GeV2. For the low-m2 integrated branching ratio in the muonic case, we find B Xsμ μ 1 59 0 11 10 6, where the error includes the parametric and perturbative uncertainties only. For B Xse e , in the current BaBar and Belle setups, the logarithm of the lepton mass gets replaced by angular cut parameters. In effect, the integrated branching ratio for
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