Nonperturbative Charming Penguin Contributions to Isospin Asymmetries in Radiative B decays

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Abstract
Recent experimental data on the radiative decays B -> V gamma, where V is a light vector meson, find negligible isospin violation in B -> K^* gamma while isospin asymmetries in B -> rho gamma are of order 20%, with large uncertainties. Using Soft-Collinear Effective Theory, we calculate isospin asymmetries in these radiative B decays up to O(1/m_b), also including O(v alpha_s) contributions from nonperturbative charming penguins (NPCP). Our fit to the experimental data indicates that NPCP give large contributions which are crucial for accommodating the large difference in the observed isospin asymmetries. The extracted values for NPCP contributions predict large CP violating asymmetries in B -> rho gamma of order 10-30%.

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