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Probing the inner structures of the observed $Ξ_{b}$ and $Ξ_{b}^{'}$ resonances

Yu-Bin Zhang¹, Yi-Heng Wang¹, Hui-Hua Zhong^2,*, and Li-Ye Xiao ^1,†

¹Institute of Theoretic al Physics, University of Science and Technology Beijing, Beijing 100083, China
²College of Aeronautics Mechanical and Electrical Engineering, Jiangxi Flight University, Nanchang 330088, China

^*Contact author: zhonghuihua@foxmail.com
^†Contact author: lyxiao@ustb.edu.cn

Phys. Rev. D 113, 116012 – Published 5 June, 2026

DOI: https://doi.org/10.1103/2tg7-jhqy

Abstract

To shed light on the inner structure of the observed single-bottom strange baryons, in this work we systematically study the Okubo-Zweig-Iizuka allowed strong decay properties of $1 P$ - and $2 S$ -wave $Ξ_{b}$ and $Ξ_{b}^{'}$ baryons within the $j − j$ coupling scheme in the framework of the quark pair creation model. For a comparison, we also give the predictions of the chiral quark model. The calculations indicate that (i) The $1 P$ -wave $λ$ -mode $Ξ_{b}$ states $Ξ_{b} | J^{P} = 1 / 2^{-}, 1 ⟩_{λ}$ and $Ξ_{b} | J^{P} = 3 / 2^{-}, 1 ⟩_{λ}$ are highly promising candidates for the observed state $Ξ_{b} (6087)$ and $Ξ_{b} (6095) / Ξ_{b} (6100)$ , respectively. The $1 P$ -wave $λ$ -mode $Ξ_{b}^{'}$ states $Ξ_{b}^{'} | J^{P} = 3 / 2^{-}, 2 ⟩_{λ}$ and $Ξ_{b}^{'} | J^{P} = 5 / 2^{-}, 2 ⟩_{λ}$ are likely candidates for the state $Ξ_{b} (6227)$ . Meanwhile, we cannot rule out the possibility that $Ξ_{b} (6227)$ could be a candidate of the $1 P$ -wave $ρ$ -mode $Ξ_{b}$ state $Ξ_{b} | J^{P} = 3 / 2^{-}, 2 ⟩_{ρ}$ or $Ξ_{b} | J^{P} = 5 / 2^{-}, 2 ⟩_{ρ}$ . (ii) For the other $1 P$ -wave $ρ$ -mode $Ξ_{b}$ states and $1 P$ -wave $λ$ -mode $Ξ_{b}^{'}$ states, they may be moderate states with a width of several tens of MeV. Their main decay channels are $Ξ_{b} π$ , $Ξ_{b}^{'} π$ , $Ξ_{b}^{*} π$ or $Λ_{b} \bar{K}$ . The width of the $1 P$ -wave $ρ$ -mode $Ξ_{b}^{'}$ states are slightly broader, approximately several tens to over one hundred MeV, and the dominant decay channels are $Ξ_{b}^{'} π$ , $Ξ_{b}^{*} π$ , $Σ_{b} K$ or $Σ_{b}^{*} K$ . (iii) The $2 S$ -wave $λ$ -mode $Ξ_{b}$ and $Ξ_{b}^{'}$ states are most likely to be relatively narrow state with a width of only a few to around ten MeV, and they mainly decay into $Ξ_{b}^{'} π$ or $Ξ_{b}^{*} π$ . Meanwhile, the decay process of $2 S$ -wave $λ$ -mode $Ξ_{b}^{'}$ states into the final states containing $1 P$ -wave $Ξ_{b}$ baryons should not be overlooked either. We hope that the theoretical results can provide some reference for future experimental investigations.

Physics Subject Headings (PhySH)

Particle decays

Article Text

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Phys. Rev. D 113, 116012– Published 5 June, 2026

Vol. 113, Iss. 11 — 1 June 2026

Received 5 January 2026
Accepted 8 April 2026

DOI: https://doi.org/10.1103/2tg7-jhqy

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Probing the inner structures of the observed $Ξ_{b}$ and $Ξ_{b}^{'}$ resonances

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Probing the inner structures of the observed Ξb and Ξb′ resonances

Abstract

Physics Subject Headings (PhySH)

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References (79)

Probing the inner structures of the observed $Ξ_{b}$ and $Ξ_{b}^{'}$ resonances