Studies of B-Hadron Decays to Charmless Final States at LHCb

TL;DR

This paper reports precise measurements of B-hadron decay asymmetries and lifetimes at LHCb, including the first observation of CP violation in Bs -> pi+ K-, demonstrating LHCb's capability for detailed flavor physics studies.

Contribution

It presents the first observation of CP violation in Bs -> pi+ K- and provides the world's best measurements of specific B-hadron decay parameters using early LHCb data.

Findings

First observation of CP violation in Bs -> pi+ K-

New world's best measurements of Acp(Bd -> K+ pi-) and tau(Bs -> K+ K-)

Demonstrates LHCb's precision in hadronic B-decay studies

Abstract

LHCb has a rich programme studying hadronic B-decays and is already showing that with early data it can produce precision measurements which improve on current world averages. The preliminary results presented include the new world's best measurements of the Acp(Bd -> K+ pi-) = -0.088 +/- 0.011 (stat) +/- 0.008 (syst) and tau(Bs -> K+ K-) = 1.440 +/- 0.096 (stat) +/- 0.010 (syst) ps. These were obtained using the full 2010 data sample containing 37 pb-1 and also 320 pb-1 of the 2011 data. The first observation of CP violation in Bs -> pi+ K- is also presented.