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First evidence of direct $C\!P$ violation in charmless two-body decays of $B^0_s$ mesons / LHCb Collaboration
Using a data sample corresponding to an integrated luminosity of 0.35 $\mathrm{fb}^{-1}$ collected by LHCb in 2011, we report the first evidence of $C\!P$ violation in the decays of $B^0_s$ mesons to $K^\pm \pi^\mp$ pairs, $A_{C\!P}(B^0_s \rightarrow K \pi)=0.27 \pm 0.08\,\mathrm{(stat)} \pm 0.02\,\mathrm{(syst)}$, with a significance of 3.3$\sigma$. Furthermore, we report the first observation of $C\!P$ violation in $B^0$ decays at a hadron collider, $A_{C\!P}(B^0 \rightarrow K\pi)=-0.088 \pm 0.011\,\mathrm{(stat)} \pm 0.008\,\mathrm{(syst)}$, with a significance exceeding 6$\sigma$..
arXiv:1202.6251; LHCB-PAPER-2011-029; CERN-PH-EP-2012-058; CERN-PH-EP-2012-058; LHCB-PAPER-2011-029.- Geneva : CERN, 2012 - 8 p. - Published in : Phys. Rev. Lett. 108 (2012) 201601 APS Open access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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