Measurement of the Ω⁰_c and Ξ⁰_c baryon lifetimes using hadronic b-baryon decays

The lifetimes of the Ω0c and Ξ0c baryons are measured using a pp collision datasetcollected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1.The charm baryons are produced in the fully reconstructed decay chains Ω−b → Ω0c(→pK−K−π+) π− and Ξ−b → Ξ0c(→ pK−K−π+) π−. The measurement uses topologically and kinematically similar B− → D0(→ K−K+π−π+) π− decays for normalisation. Themeasured lifetimes areτΩ0c= 276.3 ± 19.4 (stat) ± 1.8 (syst) ± 0.7 (τD0 )fs,τΞ0c= 149.2 ± 2.5 (stat) ± 0.9 (syst) ± 0.4 (τD0 )fs,where the first uncertainty is statistical, the second systematic and the third due to theuncertainty of the D0lifetime. These results are consistent with previous measurementsperformed by the LHCb experiment.