2 research outputs found

    Measurement of the lifetimes of promptly produced Ωc0Ω^{0}_{c} and Ξc0Ξ^{0}_{c} baryons

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    A measurement of the lifetimes of the Ωc0\Omega^{0}_{c} and Ξc0\Xi^{0}_{c} baryons is reported using proton-proton collision data at a centre-of-mass energy of 13 TeV13\text{ TeV}, corresponding to an integrated luminosity of 5.4 fb15.4\text{ fb}^{-1} collected by the LHCb experiment. The Ωc0\Omega^{0}_{c} and Ξc0\Xi^{0}_{c} baryons are produced directly from proton interactions and reconstructed in the pKKπ+pK^{-}K^{-}\pi^{+} final state. The Ωc0\Omega^{0}_{c} lifetime is measured to be 276.5±13.4±4.4±0.7 fs276.5\pm13.4\pm4.4\pm0.7\text{ fs}, and the Ξc0\Xi^{0}_{c} lifetime is measured to be 148.0±2.3±2.2±0.2 fs148.0\pm2.3\pm2.2\pm0.2\text{ fs}, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the D0D^{0} lifetime. These results confirm previous LHCb measurements based on semileptonic beauty-hadron decays, which disagree with earlier results of a four times shorter Ωc0\Omega^{0}_{c} lifetime, and provide the single most precise measurement of the Ωc0\Omega^{0}_{c} lifetime

    Measurement of the lifetimes of promptly produced Omega(0)(c) and Xi(9)(c) baryons

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    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
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