Improved measurements of the partial rate asymmetry in B→hh decays

We report improved measurements of the partial rate asymmetry (A_CP) in B→hh decays with 140 fb^-1 of data collected with the Belle detector at the KEKB e⁺e^- collider. Here h stands for a charged or neutral pion or kaon and in total five decay modes are included: K^∓π^±, K⁰_Sπ^∓, K^∓π⁰, π^∓π⁰, and K⁰_Sπ⁰. The flavor of the last decay mode is determined from the accompanying B meson. Using a data sample 4.7 times larger than that of our previous measurement, we find A_CP(K^∓π^±)-0.088±0.035±0.013, 2.4σ from zero. Results for other decay modes are also presented.