The CP asymmetry in the mixing of B_s^0 and B[over ¯]_s^0 mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0  fb^-1, recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV. Semileptonic B_s^0 and B[over ¯]_s^0 decays are studied in the inclusive mode D_s^∓μ^±ν[over (-)]_μX 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 a_sl^s=(0.39±0.26±0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of a_sl^s to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics.

Measurement of the CP Asymmetry in B_s^0-B[over ¯]_s^0 Mixing

VELTRI, MICHELE;
2016-01-01

Abstract

The CP asymmetry in the mixing of B_s^0 and B[over ¯]_s^0 mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0  fb^-1, recorded by the LHCb experiment at center-of-mass energies of 7 and 8 TeV. Semileptonic B_s^0 and B[over ¯]_s^0 decays are studied in the inclusive mode D_s^∓μ^±ν[over (-)]_μX 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 a_sl^s=(0.39±0.26±0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of a_sl^s to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2642785
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