Nonperturbative Charming Penguin Contributions to Isospin Asymmetries in Radiative B decays

Abstract

Recent experimental data on the radiative decays B -> V gamma, where V is a light vector meson, find small 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). In the absence of NPCP contributions, the theoretical predictions for the asymmetries are a few percent or less. Including the NPCP can significantly increase the isospin asymmetries for both B -> V gamma modes. We also consider the effect of the NPCP on the branching ratio and CP asymmetries in B^\pm -> V^\pm gamma.

arXiv comment14 pages, 4 figures. Updated analysis of charming penguin extraction

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• Exclusive radiative B-meson decays within the aligned two-Higgs-doublet model
• Exclusive radiative B-meson decays within minimal flavour violating 2HDMs
• Anomalous $tq\gamma$ coupling effects in exclusive radiative B-meson decays