Search for Direct CP Violation in Three-Body Charmless B+- => K+-pi+-pi-+ Decay

TL;DR

This paper reports the first evidence of direct CP violation in a charged meson decay, specifically in B+- => rho(770)0K+-, using Dalitz analysis on a large data sample from the Belle detector.

Contribution

It provides the first evidence of CP violation in a charged meson decay, using a Dalitz analysis technique on a large data set.

Findings

Evidence at 3.9 sigma level for CP violation in B+- => rho(770)0K+

First observation of CP violation in a charged meson decay

Analysis based on 386 million BBbar pairs from Belle detector

Abstract

We report results on studies of CP violation in the three-body charmless decay B+- => K+-pi+-pi-+. Evidence at the 3.9sigma level for large direct CP violation in B+- => rho(770)0K+-$ is found. This is the first evidence for CP violation in a charged meson decay. The analysis is performed using Dalitz analysis technique with a data sample that contains 386 million BBbar pairs collected near the Y(4S) resonance, with the Belle detector operating at the KEKB asymmetric energy e+ e- collider.