Photonic penguins at two loops and m_t-dependence of BR[ B -> X_s l⁺ l^-]

1999/10/04 by Christoph Bobeth, Mikolaj Misiak, Joerg Urban · 1 citation
Physics and Astronomy · #hep-ph

paper · pdf · doi:10.1016/s0550-3213(00)00007-9

published as Nucl.Phys. B574 (2000) 291-330 · 38 pages, including 8 figures, uses graphicx

arxiv created 1999/10/04 · arxiv updated 2009/11/30

Abstract

We calculate two-loop matching conditions for all the operators that are relevant to B -> Xs l+ l- decay in the Standard Model. In effect, we are able to remove the +16% uncertainty in the decay spectrum, which was mainly due to the renormalization-scale dependence of the top-quark mass. We find 1.46 * 10-6 for the branching ratio integrated in the domain 0.05 < ml+l-2/mb2 < 0.25, for l= e or mu. There remains around 13% perturbative uncertainty in this quantity, while the non-perturbative effects are expected to be smaller.

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