2005/04/30 by Craig N. Burrell, Alexander R. Williamson
Medicine · Physics and Astronomy · #Medical Imaging Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.73.114004
published as Phys.Rev. D73 (2006) 114004 · 27 pages, 5 figures. Updated input parameters and added citations; expanded discussion
arxiv created 2006/05/26 · openalex publication_date 2006/06/02 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We study O(\ensuremathαs2\ensuremathβ0) perturbative corrections to matrix elements entering two-body exclusive decays of the form B\ensuremath→\ensuremathπ\ensuremathπ, \ensuremathπK in the QCD factorization formalism, including chirally enhanced power corrections, and discuss the effect of these corrections on direct CP asymmetries, which receive their first contribution at O(\ensuremathαs). We find that the O(\ensuremathαs2\ensuremathβ0) corrections are often as large as the O(\ensuremathαs) corrections. We find large uncertainties due to renormalization scale dependence as well as poor knowledge of the nonperturbative parameters. We assess the effect of the perturbative corrections on the direct CP violation parameters of B0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-.