Measurement of the lifetimes of promptly produced Ω⁰_c and Ξ⁰_c baryons

A measurement of the lifetimes of the Ω⁰_c and Ξ⁰_c 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 pK⁻K⁻π⁺ final state. The Ω⁰_c lifetime is measured to be 276.5±13.4±4.4±0.7 fs, and the Ξ⁰_c 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 Ω⁰_c lifetime, and provide the single most precise measurement of the Ω⁰_c lifetime.