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Isospin Breaking in B -> K^* gamma Decays
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A calculation of the leading isospin-breaking contributions to the B -> K^* gamma decay amplitudes based on the QCD factorization approach is presented. They arise at order Lambda/m_b in the heavy-quark expansion and are due to annihilation contributions from 4-quark operators, the chromo-magnetic dipole operator, and charm penguins. In the Standard Model the decay rate for B^0 -> K^{*0} gamma is predicted to be about 10-20 % larger than that for B^- -> K^{*-} gamma. Isospin-breaking effects are a sensitive probe of the penguin sector of the effective weak Hamiltonian. New Physics models in which the hierarchy of B -> K^* gamma decay rates is either flipped or greatly enhanced could be ruled out with more precise data.
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Measurement of $B \to K{}^{*}(892)\gamma$ decays at Belle II
Belle II's first measurement of B→K*(892)γ decays yields branching fractions, CP asymmetries, and an isospin asymmetry consistent with the Standard Model and previous experiments.
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