Eur. Phys. J. C (2025) 85: 1026
https://doi.org/10.1140/epjc/s10052-025-14760-3

Regular Article - Theoretical Physics

A coupled-channel perspective analysis on bottom-strange molecular pentaquarks

¹ School of Physics, Central South University, 410083, Changsha, China
² Department of Physics, Hunan Normal University, 410081, Changsha, China
³ Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, 410081, Changsha, China
⁴ Key Laboratory for Matter Microstructure and Function of Hunan Province, Hunan Normal University, 410081, Changsha, China

^a 242201003@csu.edu.cn

Received: 26 March 2025
Accepted: 11 September 2025
Published online: 19 September 2025

Abstract

In the present work, we systematically study various bottom-strange molecular pentaquarks to search for possible bound states and resonances by adopting a one boson exchange model within the complex scaling method. According to our calculations, we predict several bound and resonant states for bottom baryon $Y_b({\mathrm{\Lambda }}_b,{\mathrm{\Sigma }}_b){\overline{K}}^{(\ast )}$ and $Y_{b}K_{}^{(\ast )}$ systems. In particular, a bound state in the $I(J^P)=1/2(1/2^{-}){\mathrm{\Sigma }}_b\overline{K}/{\mathrm{\Lambda }}_b{\overline{K}}^{\ast }/{\mathrm{\Sigma }}_b{\overline{K}}^{\ast }$ system may correspond to the particle ${\mathrm{\Xi }}_b(6227)$. Meanwhile, the predicted bound state with mass in the range of $6303\sim 6269\text{MeV}$ in the $I(J^P)=1/2(1/2^{-}){\mathrm{\Sigma }}_{b}K/{\mathrm{\Lambda }}_b{K}^{\ast }/{\mathrm{\Sigma }}_b{K}^{\ast }$ system is flavor exotic and does not appear in the spectroscopy of conventional baryons, which may help clarify the nature of ${\mathrm{\Xi }}_b(6227)$. We hope that our study can provide useful guidance for future experimental searches.