Search for mixing-induced CP violation using partial reconstruction of B^0→D^(*+)Xℓ^-ν_ℓ and kaon tagging

Abstract

We describe in detail a previously published measurement of CP violation in B^0-B^0 oscillations, based on an integrated luminosity of 425.7  fb^(−1) collected by the BABAR experiment at the PEPII collider. We apply a novel technique to a sample of about 6 million B^0→D^(*+)ℓ^−ν_ℓ decays selected with partial reconstruction of the D^(*+) meson. The charged lepton identifies the flavor of one B meson at its decay time, the flavor of the other B is determined by kaon tagging. We determine a CP violating asymmetry A_(CP)=(N(B^0B^0)−N(B^0B^0))/(N(B^0B^0)+N(B^0B^0))=(0.06±0.17^(+0.38)_(−0.32))% corresponding to Δ_(CP)=1−|q/p|=(0.29±0.84^(+1.88)_(−1.61))×10^(−3). This measurement is consistent and competitive with those obtained at the B factories with dilepton events.

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