Abstract
We evaluate the O(α) electromagnetic radiative corrections to the B― → V0ℓ- v̄ℓ (V is a vector meson and ℓ = e, μ decay rates. Intermediate resonance states in the real- photon amplitude are considered in order to extend the region of validity of the soft-photon approximation. The virtual corrections are regularized by the cutoff scale Λ, which is used to match the long- and short-distance regimes. The radiative corrections to the integrated decay rate are presented and we discuss its impact in the precise determination of the b quark mixing parameters.
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