Strong decays of the $X(2500)$ newly observed by the BESIII Collaboration

Abstract

Basing on the observation of a new $J^{PC}=0^{-+}$ state, $X(2500)$, in the partial wave analysis of the decay $J/\psi \to \gamma X\to \gamma \varphi \varphi$ performed by the BESIII Collaboration, we have evaluated the strong decays of the $X(2500)$ as the $4^1{S}_0$ and $5^1{S}_0$ $s\bar{s}$ states in the ${}^3{P}_0$ meson decay model. The predicted total decay width for the $4^1{S}_0$ $s\bar{s}$ is about 894.5 MeV, and the one for the $5^1{S}_0$ $s\bar{s}$ is about 271.1 MeV, which is in agreement with the experimental data ${\Gamma }_{X(2500)}=230_{-35-33}^{+64+56}$ MeV. By considering the mass and the total strong decay width of the $X(2500)$, we propose that the $X(2500)$ state can be interpreted as a candidate of the $5^1{S}_0$ $s\bar{s}$ state.

Comments: 7 pages, 4 Figures,version accepted by Phys. Rev. D