Perturbative Calculation for the Heavy Meson Matrix Element

L. T. Handoko (Kelompok Fisika Teoritik dan Komputasi, Fisika LIPI Kompleks PUSPIPTEK Serpong, Tangerang 15310, Indonesia)

Indonesian Journal of Physics (IJP)
Vol 13 No 1 (2002): Vol. 13 No.1, Januari 2002

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.