The first observation of the decay Ξ−b → ψ(2S)Ξ− and measurement of the branching ratio of Ξ−b → ψ(2S)Ξ− to Ξ−b → J/ψΞ− are presented. The J/ψ and ψ(2S) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at √s = 13 TeV in 2016–2018, corresponding to an integrated luminosity of 140 fb−1. The branching fraction ratio is measured to be B(Ξ−b → ψ(2S)Ξ−)/B(Ξ−b → J/ψΞ−) = 0.84+0.21−0.19 (stat) ± 0.10(syst) ± 0.02(B), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the Ξb(5945)0 baryon mass and natural width are also presented, using the Ξ−bπ+ final state, where the Ξ−b baryon is reconstructed through the decays J/ψΞ−, ψ(2S)Ξ−, J/ψΛK−, and J/ψΣ0K−. Finally, the fraction of Ξ−b baryons produced from Ξb(5945)0 decays is determined.

Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J., Bergauer, T., Chatterjee, S., et al. (2024). Observation of the Ξ−b → ψ(2S)Ξ− decay and studies of the Ξb(5945)0 baryon in proton-proton collisions at √s = 13 TeV. PHYSICAL REVIEW D, 110(1) [10.1103/PhysRevD.110.012002].

Observation of the Ξ−b → ψ(2S)Ξ− decay and studies of the Ξb(5945)0 baryon in proton-proton collisions at √s = 13 TeV

Xiao J.;Boldrini G.;Brivio F.;Cetorelli F.;De Guio F.;Dinardo M. E.;Gerosa R.;Ghezzi A.;Govoni P.;Guzzi L.;Lucchini M. T.;Paganoni M.;Palluotto S.;Pinolini B. S.;Pizzati G.;Ragazzi S.;Tabarelli de Fatis T.;Zuolo D.;
2024

Abstract

The first observation of the decay Ξ−b → ψ(2S)Ξ− and measurement of the branching ratio of Ξ−b → ψ(2S)Ξ− to Ξ−b → J/ψΞ− are presented. The J/ψ and ψ(2S) mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at √s = 13 TeV in 2016–2018, corresponding to an integrated luminosity of 140 fb−1. The branching fraction ratio is measured to be B(Ξ−b → ψ(2S)Ξ−)/B(Ξ−b → J/ψΞ−) = 0.84+0.21−0.19 (stat) ± 0.10(syst) ± 0.02(B), where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the Ξb(5945)0 baryon mass and natural width are also presented, using the Ξ−bπ+ final state, where the Ξ−b baryon is reconstructed through the decays J/ψΞ−, ψ(2S)Ξ−, J/ψΛK−, and J/ψΣ0K−. Finally, the fraction of Ξ−b baryons produced from Ξb(5945)0 decays is determined.
Articolo in rivista - Articolo scientifico
proton-proton collisions
English
8-lug-2024
2024
110
1
012002
none
Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J., Bergauer, T., Chatterjee, S., et al. (2024). Observation of the Ξ−b → ψ(2S)Ξ− decay and studies of the Ξb(5945)0 baryon in proton-proton collisions at √s = 13 TeV. PHYSICAL REVIEW D, 110(1) [10.1103/PhysRevD.110.012002].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/577428
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