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

Abstract : 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$\sigma$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00680493
Contributor : Sabine Starita <>
Submitted on : Monday, March 19, 2012 - 3:43:37 PM
Last modification on : Monday, July 26, 2021 - 4:12:02 PM

### Citation

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, et al.. First evidence of direct CP violation in charmless two-body decays of Bs mesons. Physical Review Letters, American Physical Society, 2012, 108, pp.201601. ⟨10.1103/PhysRevLett.108.201601⟩. ⟨in2p3-00680493⟩

Record views