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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 $B^0_s \to K^-\pi^+$ decays, $A_{C/!P}(B^0_s \rightarrow K^- \pi^+)=0.27 \pm 0.04\,\mathrm{(stat)} \pm 0.01\,\mathrm{(syst)}$, with significance exceeding five standard deviations. This is the first observation of CP violation in the decays of $B^0_s$ mesons. Furthermore, we provide an improved determination of direct CP violation in $B^0 \to K^+\pi^-$ decays, $A_{C/!P}(B^0\rightarrow K^+ \pi^-)=-0.080 \pm 0.007\,\mathrm{(stat)} \pm 0.003\,\mathrm{(syst)}$, which is the most precise measurement of this quantity to date.
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http://hal.in2p3.fr/in2p3-00817212
Contributor : Sabine Starita <>
Submitted on : Wednesday, April 24, 2013 - 10:00:45 AM
Last modification on : Friday, November 20, 2020 - 3:30:13 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. First observation of CP violation in the decays of Bs mesons. Physical Review Letters, American Physical Society, 2013, 110, pp.221601. ⟨10.1103/PhysRevLett.110.221601⟩. ⟨in2p3-00817212⟩

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