  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 constituent gluon model.
The decay patterns and decay width in the flux tube model and the constituent
gluon model (for the "gluon excited" hybrid) are very similar. 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.

High Energy Physics - Phenomenology