Nonperturbative Charming Penguin Contributions to Isospin Asymmetries in Radiative B decays

Details Nonperturbative Charming Penguin Contributions to Isospin Asymmetries in Radiative B decays Nonperturbative Charming Penguin Contributions to Isospin Asymmetries in Radiative B decays

2008-05-12

arxiv.org/abs/0805.1735v2

Phys.Rev.D78:054024,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 4 figures. Updated analysis of charming penguin extraction

Scientific paper

10.1103/PhysRevD.78.054024

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.

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