Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov
| Summary:
We measure the lifetime of the $D_s^+$ meson using a data sample of 207
fb$^{-1}$ collected by the Belle II experiment running at the SuperKEKB
asymmetric-energy $e^+ e^-$ collider. The lifetime is determined by fitting the
decay-time distribution of a sample of $116times 10^3$
$D_s^+rightarrowphipi^+$ decays. Our result is $tau^{}_{D^+_s} = (499.5pm
1.7pm 0.9)$ fs, where the first uncertainty is statistical and the second is
systematic. This result is significantly more precise than previous
measurements.
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