Eur. Phys. J. C (2025) 85: 365
https://doi.org/10.1140/epjc/s10052-025-13874-y

Regular Article - Theoretical Physics

Investigating the glueball-like particle X(2370) in B meson decays

¹ Shanghai Key Laboratory for Particle Physics and Cosmology, Key Laboratory for Particle Astrophysics and Cosmology (MOE), School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China
² School of Physics, Beihang University, 102206, Beijing, China

^a guangyuwang@sjtu.edu.cn
^b zhangqa@buaa.edu.cn

Received: 29 October 2024
Accepted: 24 January 2025
Published online: 31 March 2025

Abstract

Based on the collected data on $J/\psi \to \gamma K_S^0{K}_S^0{\eta }^{\prime }$, the Beijing Spectrometer (BESIII) experiment has conducted an analysis of the mass and spin parity of the X(2370) particle. The findings areconsistent with the characteristics expected of the lightest pseudoscalar glueball. We point out that further exploration of this particle’s nature can be pursued through investigations of heavy bottom meson decays. Assuming the identity of X(2370) as a pseudoscalar glueball, we compute the form factors for $B\to X(2370)$ transitions in the factorization approach. With these results, the estimated branching fractions for semileptonic B decays into X(2370) can reach the order of ${10}^{-6}$ and those for nonleptonic decays can reach the order ${10}^{-8}$. These results suggest that decays of B mesons into X(2370) are detectable at experimental facilities like Belle-II. Future experimental endeavors hold promise in expanding our understanding of glueball physics, contributing to the ongoing exploration of this intriguing particle.