First observation of CP violation in the decays of Bs0 mesons

The LHCb Collaboration

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Abstract

Using pp collision data corresponding to an integrated luminosity of 1.0 fb-1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in Bs0→K -π+ decays, ACP(Bs0→K -π+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of Bs0 mesons. Furthermore, we provide an improved determination of direct CP violation in B0→K+π- decays, ACP(B0→K+π-)=-0.080±0. 007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date.

Original languageEnglish
Article number221601
Number of pages9
JournalPhysical Review Letters
Volume110
Issue number22
DOIs
Publication statusPublished - 30 May 2013
Externally publishedYes

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