2005/03/31 by Yue-Liang Wu, Yu-Feng Zhou · 4 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.72.034037
published as Phys.Rev. D72 (2005) 034037 · 27 pages, 9 figures, reference added, to appear in Phy.Rev.D
arxiv created 2005/08/26 · openalex publication_date 2005/08/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Charmless B decay modes B\ensuremath→\ensuremathπ\ensuremathπ,\ensuremathπK and KK are systematically investigated with and without flavor SU(3) symmetry. Independent analyses on \ensuremathπ\ensuremathπ and \ensuremathπK modes both favor a large ratio between color-suppressed tree (C) and tree (T) diagram, which suggests that they are more likely to originate from long distance effects. The sizes of QCD penguin diagrams extracted individually from \ensuremathπ\ensuremathπ, \ensuremathπK and KK modes are found to follow a pattern of SU(3) breaking in agreement with the naive factorization estimates. Global fits to these modes are done under various scenarios of SU(3) relations. The results show good determinations of weak phase \ensuremathγ in consistency with the standard model (SM), but a large electroweak penguin (PEW) relative to T+C with a large relative strong phase is favored, which requires a big enhancement of color-suppressed electroweak penguin (PEWC) compatible in size but destructively interfering with PEW within the SM, or implies new physics. The possibilities of sizable contributions from nonfactorizable diagrams such as W exchange (E), annihilation (A), and penguin-annihilation diagrams (PA) are investigated. The implications to the branching ratios and CP violations in KK modes are discussed.