A possible explanation of the threshold enhancement in the process *

Abstract

Abstract Inspired by the recent measurement of the process , we calculate the mass spectrum of the meson with the GI model. For the excited vector strangeonium states and , we investigate the electronic decay width with the Van Royen-Weisskopf formula, and the partial widths of the , , and decay modes with the extended quark-pair creation model. We find that the electronic decay width of the -wave vector strangeonium is about times larger than of the -wave vector strangeonium. Around 2232 MeV, the partial decay width of the mode can be up to several MeV for , while the partial decay width of is keV. If the threshold enhancement reported by the BESIII collaboration arises from the strangeonium meson, this state is very likely the state. We also note that the and partial decay widths of the states and are several MeV, which is sufficient to be observed in future experiments.