Eur. Phys. J. C (2025) 85: 1181
https://doi.org/10.1140/epjc/s10052-025-14905-4

Regular Article - Theoretical Physics

An analysis on doubly bottom molecular tetraquarks composed of $H_{(s)}$ and $T_{(s)}$ doublets

¹ School of Physics and Electronics, Henan University, 475004, Kaifeng, China
² School of Physics, Central South University, 410083, Changsha, China
³ Department of Physics, Hunan Normal University, 410081, Changsha, China
⁴ Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, 410081, Changsha, China
⁵ Key Laboratory for Matter Microstructure and Function of Hunan Province, Hunan Normal University, 410081, Changsha, China

^a lvqifang@hunnu.edu.cn
^b zhujy@henu.edu.cn

Received: 23 July 2025
Accepted: 5 October 2025
Published online: 21 October 2025

Abstract

In this work, we investigate the doubly bottom $H_{(s)}{\overline{T}}_{(s)}$ and $H_{(s)}{T}_{(s)}$ systems by adopting the one-boson-exchange model, where $H_{(s)}$ and $T_{(s)}$ represent S-wave $B_{(s)}^{(\ast )}$ and P-wave $B_{(s)1,2}^{(\ast )}$ doublets, respectively. For the $H\overline{T}$ systems, we predict some loosely bound states in the $I(J^{\mathit{PC}})=0(1^{-\pm })$$B{\overline{B}}_1,$$I(J^{\mathit{PC}})=0(2^{-\pm })$$B\overline{B}_2^{\ast },$$I(J^{\mathit{PC}})=0(1^{-\pm })$$B^{\ast }{\overline{B}}_1$ and $I(J^{\mathit{PC}})=0(2^{-\pm })$$B^{\ast }\overline{B}_2^{\ast }$ channels, which are the most promising hidden bottom molecular tetraquarks. For the HT systems, the $B^{\ast }{B}_1$ channels with quantum numbers $I(J^P)=0(1^{-}),0(2^{-})$ and the $B^{\ast }{B}_2^{\ast }$ channels with $I(J^P)=0(2^{-})$ are also likely candidates for forming molecular tetraquarks. In contrast, no molecular candidates have been identified in the bottom-strange sectors. One can hope that our predictions will provide valuable insights to the LHCb and Belle II Collaborations as they continue to explore this fascinating field through experimental research.