Direct CP Violation in Charmless B Decays at LHCb

TL;DR

This paper reports measurements of direct CP violation in charmless B meson decays at LHCb, revealing significant charge asymmetries in several decay channels, which provide insights into matter-antimatter asymmetry.

Contribution

First measurement of charge asymmetries in multiple charmless B meson decay channels using LHCb data from 2011.

Findings

Positive asymmetries in Bs->K-pi+ and B+->pi+pi+pi-

Negative asymmetries in B0->K+pi- and B+->K+K+K-

Significant CP violation signals observed in several decay modes

Abstract

Using data collected by LHCb experiment in 2011 we report the measurements of charge asymmetries in charmless decays of B mesons in two or three charged kaons or pions. We find positive charge asymmetries in the channels Bs->K-pi+(3.3 sigmas), B+->K+pi+pi- (2.8 sigmas), and B+->pi+pi+pi- (4.2 sigmas) and negative in B0->K+pi-(6 sigmas),B+->K+K+K- (3.7 sigma), B+->K+K-pi+ (3.0 sigma).