Measurement of the lifetimes of promptly produced Ω_c ⁰ and Ξ_c ⁰ baryons

A measurement of the lifetimes of the Ω_c ⁰ and Ξ_c ⁰ 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 Ω_c ⁰ and Ξ_c ⁰ baryons are produced directly from proton interactions and reconstructed in the pK^-K^-π⁺ final state. The Ω_c ⁰ lifetime is measured to be 276.5±13.4±4.4±0.7fs, and the Ξ_c ⁰ 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 Ω_c ⁰ lifetime, and provide the single most precise measurement of the Ω_c ⁰ lifetime.