Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-10-31
Int.J.Mod.Phys. A16S1B (2001) 527-529
Physics
High Energy Physics
High Energy Physics - Experiment
3 pages, 2 figures, DPF2000, Columbus, Ohio, 9-12 August 2000
Scientific paper
10.1142/S0217751X01007406
The lifetimes of charmed mesons have been measured using 2.75fb$^{-1}$ 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 $\tau(D^0)=(414.8\pm3.8\pm3.4)$ fs, $\tau(D^+)=(1040^{+23}_{-22}\pm18)$ fs and $\tau(D_s^+)=(479^{+17}_{-16}{}^{+6}_{-8})$ fs, where the first error is statistical and the second error is systematic. The mixing parameter $y_{CP}$ is also measured through the lifetime difference of $D^0$ mesons decaying into CP-mixed states and CP eigenstates. We find $y_{CP}=(1.0^{+3.8}_{-3.5}{}^{+1.1}_{-2.1})%$, corresponding to a 95% confidence interval $-7.0%<\ycp<8.7%$.
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