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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/221295
Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons
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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 to be 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.
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GRAUGÉS POUS, Eugeni, LOBO SALVIA, Aniol, LÓPEZ HUERTAS, Albert, MANERA ESCALERO, Rafel, MARIN BENITO, Carla, MAURICIO FERRE, Joan, VAZQUEZ GOMEZ, Ricardo, LHCb Collaboration. Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons. _Physical Review D_. 2023. Vol. 108, núm. 5. [consulta: 24 de gener de 2026]. ISSN: 2470-0010. [Disponible a: https://hdl.handle.net/2445/221295]