Measurements of Charmed Meson Lifetimes and Search for D 0-d 0 Mixing with the Belle Experiment

The lifetimes of charmed mesons have been measured using 11.1 fb −1 of data collected with the Belle detector at KEKB. Each candidate is fully reconstructed to identify the flavor of the charmed meson. The lifetimes are measured to be τ (D 0) = (414.5 ± 1.7(stat.)) fs, τ (D +) = (1029 ± 12(stat.)) fs and τ (D + s) = (488.4 +7.8 −7.7 (stat.)) fs, where the error is statistical only. The ratios of the lifetimes of D + and D + s with respect to D 0 are measured to be τ (D +)/τ (D 0) = 2.48 ± 0.03(stat.) and τ (D + s)/τ (D 0) = 1.18 ± 0.02(stat.). The mixing parameter y CP is also measured to be y CP = (1.16 +1.67 −1.65 (stat.)) % through the lifetime difference of D 0 mesons decaying into CP-mixed states and CP eigenstates. All results are preliminary.