Measurement of the c⁰ and Ξc⁰ baryon lifetimes using hadronic b-baryon decays

A bstract The lifetimes of the c⁰ Ω c 0 and Ξc⁰ Ξ c 0 baryons are measured using a pp collision dataset collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb − 1 . The charm baryons are produced in the fully reconstructed decay chains b⁻→ c⁰(→ pK⁻K⁻π⁺)π⁻ Ω b − → Ω c 0 → p K − K − π + π − and Ξb⁻→ Ξc⁰(→ pK⁻K⁻π⁺)π⁻ Ξ b − → Ξ c 0 → p K − K − π + π − . The measurement uses topologically and kinematically similar B − → D 0 (→ K − K + π − π + ) π − decays for normalisation. The measured lifetimes are $$ { {array}{c}{τ}_c^0=276.3± 19.4(stat)± 1.8(syst)± 0.7({τ}D^0)fs,\\ {}{τ}Ξ_c^0=149.2± 2.5(stat)± 0.9(syst)± 0.4\ ({τ}D^0)fs,{array}} $$ τ Ω c 0 = 276.3 ± 19.4 stat ± 1.8 syst ± 0.7 τ D 0 fs , τ Ξ c 0 = 149.2 ± 2.5 stat ± 0.9 syst ± 0.4 τ D 0 fs , where the first uncertainty is statistical, the second systematic and the third due to the uncertainty of the D 0 lifetime. These results are consistent with previous measurements performed by the LHCb experiment.