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Exclusive radiative and electroweak b->d and b->s penguin decays at NLO

M. Beneke·Th. Feldmann·D. Seidel
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Abstract

We provide Standard Model expectations for the rare radiative decays B->K^* gamma, B->rho gamma and B-> omega gamma, and the electroweak penguin decays B->K^* l^+ l^- and B->rho l^+ l^- at the next-to-leading order (NLO), extending our previous results to b->d transitions. We consider branching fractions, isospin asymmetries and direct CP asymmetries. For the electroweak penguin decays, the lepton-invariant mass spectrum and forward-backward asymmetry is also included. Radiative and electroweak penguin transitions in b->d are mainly interesting in the search for new flavour-changing neutral current interactions, but in addition the B->rho gamma decays provide constraints on the CKM parameters (\barρ,\barη). The potential impact of these constraints is discussed.

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M. Beneke, Th. Feldmann, D. Seidel. 2004-12-28. Exclusive radiative and electroweak b->d and b->s penguin decays at NLO. https://doi.org/10.1140/epjc%2Fs2005-02181-5

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