A General Lower Bound for Radiative B Decay

Details A General Lower Bound for Radiative B Decay A General Lower Bound for Radiative B Decay

1992-05-14

arxiv.org/abs/hep-ph/9205219v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

(Cosmetic changes: (1) an expanded discussion of the logarithmic GIM suppression, (2) typos corrected and (3) updated referenc

Scientific paper

In a wide class of models -- including the standard model -- flavor-changing neutral currents are suppressed by an approximate chiral symmetry of the low-energy lagrangian. This symmetry allows the derivation of general relations among low-energy flavour-changing processes. We derive one such: the relative sizes of the decay rates b --> s gamma, b --> d gamma and s --> d gamma. Together with a unitarity-related lower bound on the rate for the strangeness-changing hyperon decay Omega^- --> Xi^- \gamma we obtain a reasonably model-independent lower bound for the inclusive b --> s gamma rate.

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