Search for $Z_{s1}^{+}$ and $Z_{s2}^{+}$ strangeonium-like structures

Theoretically, it has been presumed from an effective Lagrangian calculation that there could exist two charged strangeonium-like molecular states $Z_{s1}^{+}$ and $Z_{s2}^{+}$, with $K{\bar{K}}^{\ast }$ and $K^{\ast }{\bar{K}}^{\ast }$ configurations respectively. In the framework of QCD sum rules, we predict that masses of $Z_{s1}^{+}$ ($K{\bar{K}}^{\ast }$) and $Z_{s2}^{+}$ ($K^{\ast }{\bar{K}}^{\ast }$) are $1.85\pm 0.14GeV$ and $2.02\pm 0.15GeV$ respectively, which are both above their respective two meson thresholds. We suggest to put in practice the search for these two charged strangeonium-like structures in future experiments.