Nonperturbative charming penguin contributions to isospin asymmetries in radiative B decays

作者：Kim Chul^*; Leibovich Adam K; Mehen Thomas

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, 78(5): 054024.

DOI：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(nu 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-+/- -> V-+/-gamma.

• 出版日期2008-9