Measurement of the lifetimes of promptly produced Ω0c and Ξ0c baryons

LHCb Collaboration, Nigel Watson, Simone Bifani, Mark Slater, Paul Swallow, Ryan Calladine, Naomi Cooke, Dmitry Popov, Philip Ilten, Jonathan Plews, Antonino Sergi, Daniel Thompson

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A measurement of the lifetimes of the Ω0c and Ξ0c baryons is reported using proton-proton collision data at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb−1 collected by the LHCb experiment. The Ω0c and Ξ0c baryons are produced directly from proton interactions and reconstructed in the pKKπ+ final state. The Ω0c lifetime is measured to be 276.5±13.4±4.4±0.7 fs, and the Ξ0c lifetime is measured to be 148.0±2.3±2.2±0.2 fs, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the D0 lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter Ω0c lifetime, and provide the single most precise measurement of the Ω0c lifetime.
Original languageEnglish
Pages (from-to)479-487
Number of pages9
JournalScience Bulletin
Issue number5
Early online date1 Dec 2021
Publication statusPublished - 15 Mar 2022


  • Charm physics
  • Charmed baryon
  • Flavour physics
  • LHCb
  • Lifetime
  • QCD


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