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 D_{s}^{+} Lifetime at Belle II

Bettarini, S;Casarosa, G;Corona, L;de Marino, G;De Nuccio, M;De Pietro, G;Forti, F;Massaccesi, L;Mondal, S;Paladino, A;Paoloni, E;Rizzo, G;Tenchini, F;
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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1216558
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