Precise Measurement of the Ds+ Lifetime at Belle II
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Date
2023-10-27, 2023-10-25
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American Physical Society
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.
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Keywords
Belle II Collaboration, 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 4902 Mathematical Physics, 49 Mathematical Sciences, 51 Physical Sciences, 40 Engineering