The $\eta (2225)$ observed by the BES Collaboration

Abstract

In the framework of the ${}^3{P}_0$ meson decay model, the strong decays of the $3^1{S}_0$ and $4^1{S}_0$ $s\bar{s}$ states are investigated. It is found that in the presence of the initial state mass being 2.24 GeV, the total widths of the $3^1{S}_0$ and $4^1{S}_0$ $s\bar{s}$ states are about 438 MeV and 125 MeV, respectively. Also, when the initial state mass varies from 2220 to 2400 MeV, the total width of the $4^1{S}_0$ $s\bar{s}$ state varies from about 100 to 132 MeV, while the total width of the $3^1{S}_0$ $s\bar{s}$ state varies from about 400 to 594 MeV. A comparison of the predicted widths and the experimental result of $(0.19\pm 0.03_{-0.06}^{+0.04})$ GeV, the width of the $\eta (2225)$ with a mass of $(2.24_{-0.02-0.02}^{+0.03+0.03})$ GeV recently observed by the BES Collaboration in the radiative decay $J/\psi \to \gamma \varphi \varphi \to \gamma K^{+}{K}^{-}{K}_S^0{K}_L^0$, suggests that it would be very difficult to identify the $\eta (2225)$ as the $3^1{S}_0$ $s\bar{s}$ state, and the $\eta (2225)$ seams a good candidate for the $4^1{S}_0$ $s\bar{s}$ state.

14 pages, 3 figures, typos corrected, Accepted by Physical Review D

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