A measurement of the lifetimes of the Ω0c and Ξ0c 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 p K− K− π+ final state. The Ω0c lifetime is measured to be 276.5 ± 13.4 ± 4.4 ± 0.7 fs, and the Ξ0c 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 Ω0c lifetime, and provide the single most precise measurement of the Ω0c lifetime.
Measurement of the Lifetimes of Promptly Produced Ω0c and Ξ0c Baryons
Calabrese, R.;Capriotti, L.;Couturier, B.;Fiorini, M.;Franzoso, E.;Giugliano, C.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Neri, I.;Okamura, S.;Pappalardo, L. L.;Passalacqua, B.;Tomassetti, L.;
2022
Abstract
A measurement of the lifetimes of the Ω0c and Ξ0c 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 p K− K− π+ final state. The Ω0c lifetime is measured to be 276.5 ± 13.4 ± 4.4 ± 0.7 fs, and the Ξ0c 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 Ω0c lifetime, and provide the single most precise measurement of the Ω0c lifetime.File | Dimensione | Formato | |
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2022-AR-14-Meas_of_the_Lifet_of_Promptly_Prod_Omega0c_and_Xi0c-SCIB.pdf
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