Study of CP Asymmetry in B⁰−B̅⁰ Mixing with Inclusive Dilepton Events
Lees, J. P.
Izen, Joseph M.
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We present a measurement of the asymmetry A(CP) between same- sign inclusive dilepton samples ℓ⁺ℓ⁺ and ℓ⁻ℓ⁻ (ℓ = e, μ) from semileptonic B decays in ϒ(4S) → BB̅ events, using the complete data set recorded by the BABAR experiment near the ϒ(4S) resonance, corresponding to 471 x 10⁶ BB̅ pairs. The asymmetry A(CP) allows comparison between the mixing probabilities P((B̅⁰ → B⁰) and P(B⁰ → B̅⁰)) and therefore probes CP and T violation. The result, A(CP) = [-3.9 ± 3.5(stat) ± 1.9(syst)] x 10⁻³, is consistent with the standard model expectation.