Measurement of D^0-D^0 mixing and CP violation in two-body D^0 decays

Abstract

We present a measurement of D^0-D^0 mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D^0 mesons produced through the flavor-tagged process D^(*+)→D^0π^+, where D^0 decays to K^∓π^±, K^-K^+, or π^-π^+, along with the untagged decays D^0→K^∓π^± and D^0→K^-K^+. The lifetimes of the CP-even, Cabibbo-suppressed modes K^-K^+ and π^-π^+ are compared to that of the CP-mixed mode K^∓π^± in order to measure y_(CP) and ΔY. We obtain y_(CP)=[0.72±0.18(stat)±0.12(syst)]% and ΔY=[0.09±0.26(stat)±0.06(syst)]%, where ΔY constrains possible CP violation. The y_(CP) result excludes the null mixing hypothesis at 3.3σ significance. This analysis is based on an integrated luminosity of 468  fb^(-1) collected with the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider.

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