Precise Measurement of the $D^+_s$ Lifetime at Belle II

The Belle-II Collaboration,; Adachi, I.; et al.,

doi:10.1103/PhysRevLett.131.171803

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Precise Measurement of the $D^+_s$ Lifetime at Belle II

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The Belle-II Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adachi, I.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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The Belle-II Collaboration, Adachi, I., & et al. (2023). Precise Measurement of the $D^+_s$ Lifetime at Belle II. Physical Review Letters, 131, 171803. doi:10.1103/PhysRevLett.131.171803.

Cite as: https://hdl.handle.net/21.11116/0000-000F-1218-2

Abstract

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 $116\times 10^3$ $D_s^+\rightarrow\phi\pi^+$ decays. Our result is $\tau^{}_{D^+_s} = (498.7\pm 1.7\,^{+1.1}_{-0.8})$ fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.