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We investigate the mass spectrum of the $ss \bar s \bar s$ tetraquark stateswithin the relativized quark model. By solving the Schr\"{o}dinger-likeequation with the relativized potential, the masses of the $S-$ and $P-$wave$ss \bar s \bar s$ tetraquarks are obtained. The screening effects are alsotaken into account. It is found that the observed resonant structure $X(2239)$in the $e^+e^- \to K^+K^-$ process by BESIII Collaboration can be assigned as a$P-$wave $1^{--}$ $ss \bar s \bar s$ tetraquark state. Furthermore, theradiative transition and strong decay behaviors of this structure are alsoestimated, which can provide helpful information for future experimentalsearches.

The $ss \bar s \bar s$ tetraquark states and the newly observed structure $X(2239)$ by BESIII Collaboration