Direct CP Violation in Charmless B Decays

TL;DR

This paper presents updated measurements of direct CP violation in various charmless B meson decay modes from Belle and BaBar, providing key insights into matter-antimatter asymmetry.

Contribution

It offers new experimental results on CP violation in multiple B decay channels, enhancing understanding of CP asymmetry phenomena.

Findings

Significant CP asymmetry in B -> K+ pi- decay (-0.108±0.016)

Observation of CP violation in B -> rho0(770) K+ (0.31+0.11-0.10)

Measurement of CP asymmetry in B -> eta K+ (-0.33±0.12)

Abstract

We report the updated results of direct CP violation measurements from Belle and BaBar for the following modes: B -> h+h-/h+-pi^0, B -> eta(') h+- and B -> K+-pi+-pi-+, where h stands for a charged kaon or pion. The data used in these studies are up to 386 million BBbar pairs for Belle and 232 million BBbar pairs for BaBar. The current significant measurements include: Acp(B -> K+ pi-)=-0.108+/-0.016, Acp(B -> rho0(770) K+)=0.31+0.11-0.10, and Acp(B -> eta K+)=-0.33+/-0.12.