The mass difference between the Ω−b and Ξ−b baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1, and is found to be mðΩ−b Þ − mðΞ−b Þ ¼ 248.54 0.51ðstatÞ 0.38ðsystÞ MeV=c2. The mass of the Ω− b baryon is measured tobe mðΩ−b Þ ¼ 6045.9 0.5ðstatÞ 0.6ðsystÞ MeV=c2. This is the most precise determination of the Ω−b mass to date. In addition, the production rate of Ω−b baryons relative to that of Ξ−b baryons is measured for the first time in pp collisions, using an LHCb dataset collected at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 6 fb−1. Reconstructing beauty baryons in the kinematic region 2 < η < 6 and pT < 20 GeV=c with their decays to a J=ψ meson and a hyperon, the ratio fΩ−b fΞ−b× BðΩ−b →J=ψΩ−Þ BðΞ−b →J=ψΞ−Þ ¼ 0.120 0.008ðstatÞ 0.008ðsystÞ, is obtained, where fΩ−b and fΞ−b are the fragmentation fractions of b quarks into Ω−b and Ξ−b baryons, respectively, and B represents the branching fractions of their respective decays.

Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons

Bolzonella, R.;Calabrese, R.;Capriotti, L.;Cavallini, V.;Couturier, B.;Fiorini, M.;Franzoso, E.;Guarise, M.;Kotriakhova, S.;Luppi, E.;Okamura, S.;Pappalardo, L.  L.;Passalacqua, B.;Tomassetti, L.;
2023

Abstract

The mass difference between the Ω−b and Ξ−b baryons is measured using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1, and is found to be mðΩ−b Þ − mðΞ−b Þ ¼ 248.54 0.51ðstatÞ 0.38ðsystÞ MeV=c2. The mass of the Ω− b baryon is measured tobe mðΩ−b Þ ¼ 6045.9 0.5ðstatÞ 0.6ðsystÞ MeV=c2. This is the most precise determination of the Ω−b mass to date. In addition, the production rate of Ω−b baryons relative to that of Ξ−b baryons is measured for the first time in pp collisions, using an LHCb dataset collected at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 6 fb−1. Reconstructing beauty baryons in the kinematic region 2 < η < 6 and pT < 20 GeV=c with their decays to a J=ψ meson and a hyperon, the ratio fΩ−b fΞ−b× BðΩ−b →J=ψΩ−Þ BðΞ−b →J=ψΞ−Þ ¼ 0.120 0.008ðstatÞ 0.008ðsystÞ, is obtained, where fΩ−b and fΞ−b are the fragmentation fractions of b quarks into Ω−b and Ξ−b baryons, respectively, and B represents the branching fractions of their respective decays.
2023
Aaij, R.; Abdelmotteleb, A.  S.  W.; Beteta, C. Abellan; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulo...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2534494
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