Measurement of the lifetimes of promptly produced Ωc0 and Ξc0 baryons

C. J. G. Onderwater, M. van Veghel, K. De Bruyn, LHCb Collaboration

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A measurement of the lifetimes of the Ωc0 and Ξc0 baryons is reported using proton–proton collision data at a centre-of-mass energy of 13TeV, corresponding to an integrated luminosity of 5.4fb-1 collected by the LHCb experiment. The Ωc0 and Ξc0 baryons are produced directly from proton interactions and reconstructed in the pK-K-π+ final state. The Ωc0 lifetime is measured to be 276.5±13.4±4.4±0.7fs, and the Ξc0 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 D0 lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter Ωc0 lifetime, and provide the single most precise measurement of the Ωc0 lifetime.
Original languageEnglish
Pages (from-to)479-487
Number of pages9
JournalScience Bulletin
Issue number5
Publication statusPublished - 15-Mar-2022


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

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