First evidence of direct CP violation in charmless two-body decays of Bs0 mesons

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Aaij, R ; van den Brand, J.F.J. ; Ketel, T.J. ; Koopman, R. ; Merk, M.H.M. ; Raven, H.G. ; Schiller, M. ; LHCb, Collaboration (2012)
  • Publisher: American Physical Society
  • Journal: (vol: 108, pp: 201,601-201,601)
  • Related identifiers: doi: 10.1103/PhysRevLett.108.201601, doi: 10.1103/PhysRevLett.108.201601
  • Subject: QC | Particle Physics - Experiment | High Energy Physics - Experiment | info:eu-repo/classification/arxiv/High Energy Physics::Experiment
    arxiv: High Energy Physics::Experiment

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$\sigma$.
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