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
[ X ]
Tarih
2024
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Physical Society
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
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. © 2024 CERN, for the CMS Collaboration.
Açıklama
Anahtar Kelimeler
Kaynak
Physical Review D
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
110
Sayı
1
