Measurement of the CP asymmetry in B0s − B̅0s mixing

Abstract : The CP asymmetry in the mixing of B0s and B̅0s mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb−1, recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Semileptonic B0s and B̅0s decays are studied in the inclusive mode D∓sμ±νμX with the D∓s mesons reconstructed in the K+K−π∓ final state. Correcting the observed charge asymmetry for detection and background effects, the CP asymmetry is found to be assl=(0.39±0.26±0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of assl to date, and is consistent with the prediction from the Standard Model of particle physics.
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Submitted on : Wednesday, June 1, 2016 - 10:13:22 AM
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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Measurement of the CP asymmetry in B0s − B̅0s mixing. Physical Review Letters, American Physical Society, 2016, 117, pp.061803. ⟨10.1103/PhysRevLett.117.061803⟩. ⟨in2p3-01324510⟩

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