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

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

2012-02-28

arxiv.org/abs/1202.6251v1

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys. Rev. Lett

Scientific paper

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 CP violation in the decays of $B^0_s$ mesons to $K^\pm \pi^\mp$ pairs, $A_{CP}(B^0_s \rightarrow K \pi)=0.27 \pm 0.08\,\mathrm{(stat)} \pm 0.02\,\mathrm{(syst)}$, with a significance of 3.3$\sigma$. Furthermore, we report the first observation of CP violation in $B^0$ decays at a hadron collider, $A_{CP}(B^0 \rightarrow K\pi)=-0.088 \pm 0.011\,\mathrm{(stat)} \pm 0.008\,\mathrm{(syst)}$, with a significance exceeding 6$\sigma$.

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