Measurement of the lifetimes of promptly produced Ω c 0 and Ξ c 0 baryons.
Science bulletin(2022)
摘要
A measurement of the lifetimes of the Ω and Ξ baryons is reported using proton-proton collision data at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.4fb collected by the LHCb experiment. The Ω and Ξ baryons are produced directly from proton interactions and reconstructed in the pKKπ final state. The Ω lifetime is measured to be 276.5±13.4±4.4±0.7fs, and the Ξ lifetime is measured to be 148.0±2.3±2.2±0.2fs, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the D lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter Ω lifetime, and provide the single most precise measurement of the Ω lifetime.
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关键词
Charm physics,Charmed baryon,Flavour physics,LHCb,Lifetime,QCD
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