Exclusive radiative and electroweak b → d and b → s penguin decays at NLO

Exclusive radiative and electroweak b → d and b → s penguin decays at NLO Abstract We provide Standard Model expectations for the rare radiative decays B → K * γ, B → ργ and B → ωγ, and the electroweak penguin decays B → K * ℓ + ℓ − and B → ρ 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 → ργ decays provide constraints on the CKM parameters (¯ ρ, ¯ η). The potential impact of these constraints is discussed.