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Updated: May 10, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
First observation of CP violation in the decays of B(s)0 mesons
R Aaij1, C Abellan Beteta, B Adeva
1Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
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 B(s)(0)→K(-)π(+) decays, A(CP)(B(s)(0)→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 B(s)(0) mesons. Furthermore, we provide an improved determination of direct CP violation in B(0)→K(+)π(-) decays, A(CP)(B(0)→K(+)π(-)=-0.080±0.007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date.
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