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We present a measurement of the asymmetry $A_{CP}$ between same-signinclusive dilepton samples $\ell^+ \ell^+$ and $\ell^- \ell^-$ ($\ell= e, \mu$)from semileptonic B decays in Y(4S) --> BBbar events, using the complete dataset recorded by the BABAR experiment near the Y(4S) resonance, corresponding to471 million BBbar pairs. The asymmetry A_{CP} allows comparison between themixing probabilities P(B0bar --> B0) and P(B0 --> B0bar), and therefore probesCP and T violation. The result, $A_{CP} = (-3.9 \pm 3.5 (stat) \pm 1.9 (syst))\times 10^{-3}$, is consistent with the Standard Model expectation.

Study of CP asymmetry in B0-B0bar mixing with inclusive dilepton events