First observation of CP violation in the decays of Bs mesons

Abstract

Using pp collision data, corresponding to an integrated luminosity of $1.0{\mathrm{fb}}^{-1}$, collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in $B_s^0\to K^{-}{\pi }^{+}$ decays, $A_{C/!P}(B_s^0\to K^{-}{\pi }^{+})=0.27\pm 0.04(\mathrm{stat})\pm 0.01(\mathrm{syst})$, with significance exceeding five 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 $B^0\to K^{+}{\pi }^{-}$ decays, $A_{C/!P}(B^0\to K^{+}{\pi }^{-})=-0.080\pm 0.007(\mathrm{stat})\pm 0.003(\mathrm{syst})$, which is the most precise measurement of this quantity to date.

9 pages, 2 figures, 1 table, second version with slight changes after journal review

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