We measure the lifetime of the Ds+ 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 116×103 Ds+→φπ+ decays. Our result is τDs+=(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

Bianchi, F.;Das, S.;Destefanis, M.;Maggiora, M.;Marcello, S.;Spataro, S.;
2023-01-01

Abstract

We measure the lifetime of the Ds+ 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 116×103 Ds+→φπ+ decays. Our result is τDs+=(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
131
17
171803-1
171803-7
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.131.171803
Cabibbo–Kobayashi–Maskawa matrix, Particle properties
Adachi, I.; Aggarwal, L.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Aversano, M.; Babu, V.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2069011
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