Possible Large Direct CP Violations in Charmless B-Decays

Abstract

We discuss the perturbative QCD approach for the exclusive two body B-meson decays to light mesons. We briefly review its ingredients and some important theoretical issues on factorization approach. We show numerical results which are compatible with present experimantal data for the charmless B-meson decays. Specailly we predict the possibility of large direct CP violation effects in $B^0\to {\pi }^{+}{\pi }^{-}$ $(23\pm 7$ and $B^0\to K^{+}{\pi }^{-}$ $(-17\pm 5$. In the last section we investigate two methods to determine the weak phases ${\varphi }_2$ and ${\varphi }_3$ from $B\to \pi \pi ,K\pi$ processes. We obtain bounds on ${\varphi }_2$ and ${\varphi }_3$ from present experimental measurements.

Comments: 18 pages, latex, 8 figures and 8 tables, typos corrected and added more tables and references. Presented at the 3rd workshop on Higher Luminosity B Factory, 6-7 August 2002, Kanagawa, Japan; Submitted to Phys. Rev. D