2000/04/30 by Cai-Dian Lü, C. D. Lu, K. Ukai +2 · 2 citations
Mathematics · Physics and Astronomy · #Annihilation #Asymmetry #Branching fraction #Combinatorics #Geometry #High-Energy Particle Collisions Research #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #hep-ph
paper · pdf · doi:10.1103/physrevd.63.074009
published as Phys.Rev. D63 (2001) 074009 · Latex, 28 pages including 11 figures; added contents and figures, corrected typos
arxiv created 2000/11/08 · openalex publication_date 2001/03/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We calculate the branching ratios and CP asymmetries for B0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-, B+\ensuremath→\ensuremathπ+\ensuremathπ0, and B0\ensuremath→\ensuremathπ0\ensuremathπ0 decays, in a perturbative QCD approach. In this approach, we calculate nonfactorizable and annihilation type contributions, in addition to the usual factorizable contributions. We find that the annihilation diagram contributions are not very small as previously argued. Our result is in agreement with the measured branching ratio of \stackrel\ensuremath→B\ensuremathπ+\ensuremathπ^\ensuremath- by the CLEO Collaboration. With a non-negligible contribution from annihilation diagrams and a large strong phase, we predict a large direct CP asymmetry in B0\ensuremath→\ensuremathπ+\ensuremathπ^\ensuremath-, and \ensuremathπ0\ensuremathπ0, which can be tested by the current running B factories.