A Candidate for $1^{--}$ Strangeonium Hybrid

We propose that the recently observed structure at 2175MeV by the Babar Collaboration is a $1^{--}$ strangeonium hybrid, and we investigate this interpretation from both the flux tube model and the constitute gluon model. The decay pattern in the flux tube model and the constitute gluon model (for the "gluon excited" hybrid) is very similar, except that the prediction about the width is larger in the latter. The tetraquark hypothesis is not favored by the available experimental data. The crucial test of our scenario is suggested, furthermore, the promising channels which can discriminate the hybrid interpretation from the tetraquark are also suggested.