The mass difference between the Ωb− and Ξb− 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(Ωb−) − m(Ξb−) = 248.54 ± 0.51(stat) ± 0.38(syst) MeV/c^2. The mass of the Ωb− baryon is measured to be m(Ωb−) = 6045.9 ± 0.5(stat) ± 0.6(syst) MeV/c^2. This is the most precise determination of the Ωb− mass to date. In addition, the production rate of Ωb− baryons relative to that of Ξb− 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 p_T < 20 GeV/c with their decays to a J/ψ meson and a hyperon, the ratio f_Ωb−/f_Ξb− × B(Ωb− → J/ψ Ω−)/B(Ξb− → J/ψ Ξ−) = 0.120 ± 0.008(stat) ± 0.008(syst), is obtained, where f_Ωb− and f_Ξb− are the fragmentation fractions of b quarks into Ωb− and Ξb− baryons, respectively, and B represents the branching fractions of their respective decays.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons. PHYSICAL REVIEW D, 108(5), 1-16 [10.1103/PhysRevD.108.052008].

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

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

The mass difference between the Ωb− and Ξb− 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(Ωb−) − m(Ξb−) = 248.54 ± 0.51(stat) ± 0.38(syst) MeV/c^2. The mass of the Ωb− baryon is measured to be m(Ωb−) = 6045.9 ± 0.5(stat) ± 0.6(syst) MeV/c^2. This is the most precise determination of the Ωb− mass to date. In addition, the production rate of Ωb− baryons relative to that of Ξb− 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 p_T < 20 GeV/c with their decays to a J/ψ meson and a hyperon, the ratio f_Ωb−/f_Ξb− × B(Ωb− → J/ψ Ω−)/B(Ξb− → J/ψ Ξ−) = 0.120 ± 0.008(stat) ± 0.008(syst), is obtained, where f_Ωb− and f_Ξb− are the fragmentation fractions of b quarks into Ωb− and Ξb− baryons, respectively, and B represents the branching fractions of their respective decays.
2023
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of the mass difference and relative production rate of the Ωb- and Ξb- baryons. PHYSICAL REVIEW D, 108(5), 1-16 [10.1103/PhysRevD.108.052008].
Aaij, R.; Abdelmotteleb, A.S.W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/953335
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