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First measurement of time-dependent CP violation in Bs -> K+K- decays

Abstract : Direct and mixing-induced CP-violating asymmetries in Bs -> K+K- decays are measured for the first time using a data sample of pp collisions, corresponding to an integrated luminosity of 1.0 fb^{-1}, collected with the LHCb detector at a centre-of-mass energy of 7 TeV. The results are C_{KK} = 0.14 \pm 0.11 \pm 0.03 and S_{KK} = 0.30 \pm 0.12 \pm 0.04, where the first uncertainties are statistical and the second systematic. The corresponding quantities are also determined for B0 -> pi+pi- decays to be C_{pipi} = -0.38 \pm 0.15 \pm 0.02 and S_{pipi} = -0.71 \pm 0.13 \pm 0.02, in good agreement with existing measurements.
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http://hal.in2p3.fr/in2p3-00850723
Contributor : Sabine Starita <>
Submitted on : Thursday, August 8, 2013 - 10:56:38 AM
Last modification on : Wednesday, September 16, 2020 - 4:23:20 PM

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R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. First measurement of time-dependent CP violation in Bs -> K+K- decays. Journal of High Energy Physics, Springer, 2013, 10, pp.183. ⟨10.1007/JHEP10(2013)183⟩. ⟨in2p3-00850723⟩

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