Perturbative Calculation for the Heavy Meson Matrix Element

Abstract

We argue that the perturbative approach can be used to compute non-factorizable corrections to exclusive radiative B meson decays in the heavy quark mass limit. The explicit computation of first order QCD corrections is given. These, or the so-called hard spectator, corrections is done up to %(αs) in the leading-twist approximation. These results are combined with the already done renormalization group effect in the appropriate Wilson coefficients, the vertex corrections and the annihilation contributions to obtain a complete %(αs) improvements to the lowest order decay width. The result is particularly applied to radiative decay B → ργ which the analysis is done for its branching ratio, isospin symmetry breaking and direct CP violation.