Measurement of the lifetimes of promptly produced Ωc0 and Ξc9 baryons

A measurement of the lifetimes of the Omega(0)(c) and Xi(0)(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 Omega(0)(c) and Xi(0)(c) baryons are produced directly from proton interactions and reconstructed in the pK(-)K(-)pi(+) final state. The Omega(0)(c) lifetime is measured to be 276.5 +/- 13.4 +/- 4.4 +/- 0.7 fs, and the Xi(0)(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 D-0 lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter Omega(c)0 lifetime, and provide the single most precise measurement of the Omega(0)(c) lifetime. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Automated summary

This study reports the measurement of the lifetimes of Omega(0)(c) and Xi(0)(c) baryons using data from the LHCb experiment. The results show that the lifetime of Omega(0)(c) is 276.5 +/- 13.4 +/- 4.4 +/- 0.7 fs, and the lifetime of Xi(0)(c) is 148.0 +/- 2.3 +/- 2.2 +/- 0.2 fs. These results are consistent with previous measurements and provide the most precise measurement of the Omega(0)(c) lifetime to date.