Measurement of Charmed Meson Lifetimes with Belle

Abstract

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 $\tau (D^0)=(414.8\pm 3.8\pm 3.4)$ fs, $\tau (D^{+})=(1040_{-22}^{+23}\pm 18)$ fs and $\tau (D_s^{+})=(479_{-16}^{+17}{}_{-8}^{+6})$ 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 $y_{CP}=(1.0_{-3.5}^{+3.8}{}_{-2.1}^{+1.1})$, corresponding to a 95% confidence interval $-7.0$.

3 pages, 2 figures, DPF2000, Columbus, Ohio, 9-12 August 2000

References in corpus (1)

• Measurements of Lifetimes and a Limit on the Lifetime Difference in the Neutral D-Meson System