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.File in questo prodotto:
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PhysRevLett.131.171803.pdf
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