2005/03/31 by Thomas Becher, Richard J. Hill, Matthias Neubert
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.72.094017
published as Phys.Rev.D72:094017,2005 · 52 pages, 7 figures; references added and brief discussion of power corrections included; version to appear in Phys. Rev. D
arxiv created 2005/11/03 · openalex publication_date 2005/11/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The factorization properties of the radiative decays B\ensuremath→V\ensuremathγ are analyzed at leading order in 1/mb using the soft-collinear effective theory. It is shown that the decay amplitudes can be expressed in terms of a B\ensuremath→V form factor evaluated at q2=0, light-cone distribution amplitudes of the B and V mesons, and calculable hard-scattering kernels. The renormalization-group equations in the effective theory are solved to resum perturbative logarithms of the different scales in the decay process. Phenomenological implications for the B\ensuremath→K*\ensuremathγ branching ratio, isospin asymmetry, and CP asymmetries are discussed, with particular emphasis on possible effects from physics beyond the standard model.