2009/08/31 by Hai-Yang Cheng, Chun-Khiang Chua
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.80.074031
published as Phys.Rev.D80:074031,2009 · 12 pages, 1 figure. Experimental data and references updated, to appear in PRD
arxiv created 2009/10/08 · openalex publication_date 2009/10/27 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Within the framework of QCD factorization (QCDF), power corrections due to penguin annihilation can account for the observed rates of penguin-dominated two-body decays of B mesons and direct CP asymmetries ACP(K^\ensuremath-\ensuremathπ+), ACP(K^*\ensuremath-\ensuremathπ+), ACP(K^\ensuremath-\ensuremathρ0) and ACP(\ensuremathπ+\ensuremathπ^\ensuremath-). However, the predicted direct CP-violating effects in QCDF for B^\ensuremath-\ensuremath→K^\ensuremath-\ensuremathπ0, K^\ensuremath-\ensuremathη, \ensuremathπ^\ensuremath-\ensuremathη and B0\ensuremath→\ensuremathπ0\ensuremathπ0 are wrong in signs when confronted with experiment. We show that subleading 1/mb power corrections to the color-suppressed tree amplitude due to spectator scattering or final-state interactions will yield correct signs for aforementioned CP asymmetries and accommodate the observed \ensuremathπ0\ensuremathπ0 and \ensuremathρ0\ensuremathπ0 rates simultaneously. Implications are discussed.