Search for CP violation in B0- B̄0 mixing using partial reconstruction of B0→D*-Xℓ+νℓ and a Kaon Tag

Abstract

We present results of a search for CP violation in B0- B̄0 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(B̄0B̄0)]/[N(B0B0)+N(B̄0B̄0)]= (0.06±0.17-0.32+0.38)%, corresponding to ΔCP=1-|q/p|=(0. 29±0.84-1.61+1.88)×10-3. © 2013 American Physical Society.