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

(CMS Collaboration) Hayrapetyan, Aram ; ... ; Giljanović, Duje ; Godinović, Nikola ; Lelas, Damir ; Šćulac, Ana ; Kovač, Marko ; Šćulac, Toni ; Bargassa, Pedrame ; Brigljević, Vuko ; Chitroda, Bhakti Kanulal ; Ferenček, Dinko ; Jakovčić, Krešimir ; Mishra, Saswat ; Starodumov, Andrey ; Šuša, Tatjana ; ... ; Roguljić, Matej ; ... ; Zhokin, Alexander (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 - Particles, Fields, Gravitation and Cosmology, 110 (1). ISSN 2470-0010

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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 the Ξ−b baryons produced from Ξb(5945)0 decays is determined.

Item Type:	Article
Uncontrolled Keywords:	High energy physics ; Experimental particle physics ; LHC ; CMS ; p p: scattering ; baryon mass ; p p colliding beams ; Xi/b- hadronic decay ; J/psi(3100); leptonic decay ; psi(3685) ; muon pair production ; Xi/b- ; branching ratio ; charmonium ; Xi/b ; mass ; CERN LHC Coll ; experimental results ; Xi/b- --> J/psi(3100) Xi- ; Xi/b- --> psi(3685) Xi- ; Xi/b- --> J/psi(3100) Lambda K-
Subjects:	NATURAL SCIENCES > Physics NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions:	Division of Experimental Physics
Depositing User:	Sanja Jurković
Date Deposited:	09 Oct 2024 09:55
URI:	http://fulir.irb.hr/id/eprint/9148
DOI:	10.1103/PhysRevD.110.012002

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