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 m(Ω−b)−m(Ξ−b)=248.54±0.51(stat)±0.38(syst)  MeV/c2. The mass of the Ω−b baryon is measured to be m(Ω−b)=6045.9±0.5(stat)±0.6(syst)  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−bfΞ−b×B(Ω−b→J/ψΩ−)B(Ξ−b→J/ψΞ−)=0.120±0.008(stat)±0.008(syst), 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 / R. Aaij, A. . .A.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 108:5(2023 Sep 18), pp. 052008.1-052008.16. [10.1103/PhysRevD.108.052008]

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

C. Mancuso;D. Marangotto;A. Merli;N. Neri;E. Spadaro Norella;G. Tonani;
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 m(Ω−b)−m(Ξ−b)=248.54±0.51(stat)±0.38(syst)  MeV/c2. The mass of the Ω−b baryon is measured to be m(Ω−b)=6045.9±0.5(stat)±0.6(syst)  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−bfΞ−b×B(Ω−b→J/ψΩ−)B(Ξ−b→J/ψΞ−)=0.120±0.008(stat)±0.008(syst), 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.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
18-set-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1026610
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