Search for CP Violation in B⁰- B̅⁰ Mixing Using Partial Reconstruction of B⁰ → D*‾ Xℓ⁺ νℓ and a Kaon Tag

We present results of a search for CP violation in B⁰- B̅⁰ mixing with the BABAR detector. We select a sample of B⁰ → D*‾ Xℓ⁺ν decays with a partial reconstruction method and use kaon tagging to assess the flavor of the other B meson in the event. We determine the CP violating asymmetry A_{CP} ≡ [N(B⁰B⁰) - N(B̅⁰B̅⁰)]/N(B⁰B⁰) + N(B̅⁰B̅⁰)] = (0.06 ± 0.17_{-0.32} ^{+0.38})%, corresponding to Δ_{CP} = 1 - |q/p| = (0.29 ± 0.84_{-1.61}^{+1.88}) x 10⁻³.