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 116×10^{3} D_{s}^{+}→ϕπ^{+} decays. Our result is τ_{D_{s}^{+}}=(499.5±1.7±0.9)  fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.

Precise Measurement of the Ds+ Lifetime at Belle II

Gabrielli, A.;Ganiev, E.;Ghosh, D.;Manfredi, R.;Mantovano, M.;Raiz, S.;Vitale, L.;
2023-01-01

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 116×10^{3} D_{s}^{+}→ϕπ^{+} decays. Our result is τ_{D_{s}^{+}}=(499.5±1.7±0.9)  fs, where the first uncertainty is statistical and the second is systematic. This result is significantly more precise than previous measurements.
2023
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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.171803
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3068421
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