Precise measurement of the $D_s^+$ lifetime at Belle II

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 $\tau^{}_{D^+_s} = (499.5\pm 1.7\pm 0.9)$ fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.
Tags
Working group Charm
Principal authors @  Aman Sangal, Alan Schwartz
Reference Phys.Rev.Lett. 131, 171803 (2023), DOI: 10.1103/PhysRevLett.131.171803
Document BELLE2-PUB-PH-2023-015
Links arXiv:2306.00365, Inspire, PRL
Bibtex 
@article{Belle-II:2023eii,
    author = "Adachi, I. and others",
    collaboration = "Belle-II",
    title = "{Precise Measurement of the Ds+ Lifetime at Belle II}",
    eprint = "2306.00365",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle-Preprint-2023-007, KEK-Preprint-2023-5, UCHEP-23-03, Belle Preprint 2023-007, KEK Preprint 2023-5, Univ. Cincinnati
  preprint UCHEP-23-03",
    doi = "10.1103/PhysRevLett.131.171803",
    journal = "Phys. Rev. Lett.",
    volume = "131",
    number = "17",
    pages = "171803",
    year = "2023"
}