Studies of $\xi$(2230) in $\mathit{J}$/ $\psi$ Radiative Decays

The BES experiment at the Beijing electron-positron collider has observed the $\xi$(2230) signal in ${\pi }^{+}{\pi }^{-}$, $K^{+}{K}^{-}$, $K_S^0{K}_S^0$, and $p\overline{p}$ final states with $4.6\sigma$, $4.1\sigma$, $4.0\sigma$, and $3.8\sigma$ statistical significances, respectively. The new observations of two nonstrange decay modes of $\xi \to {\pi }^{+}{\pi }^{-}$ and $p\overline{p}$ are important evidence for the glueball interpretation of the $\xi \left(2230\right)$.