PRELIMINARY MIXING SEARCH AT BELLE

We present a mixing search in hadronic decays at the Belle experiment, measuring the “wrong-sign” / “right-sign” ratio (r_WS) in the decay D⁰ → K^± π^∓. Using 10 fb⁻¹ of e⁺e⁻ collision data collected by the Belle detector during its first six months of data taking, we obtain a preliminary result of r_WS = (0.30 ± 0.06 ± 0.08)%. We also report a y_CP measurement at Belle, based on the lifetime difference of the D⁰ → Kπ and D⁰ → KK decays.