A possible partner state of the $Y(2175)$

Abstract

We study the $Y(2175)$ using the method of QCD sum rules. There are two independent $ss\bar{s}\bar{s}$ interpolating currents with $J^{PC}=1^{--}$, and we calculate both their diagonal and off-diagonal correlation functions. We obtain two new currents which do not strongly correlate to each other, so they may couple to two different physical states: one of them couples to the $Y(2175)$, while the other may couple to another state whose mass is about $71_{-48}^{+172}$ MeV larger. Evidences of the latter state can be found in the BaBar, BESII, Belle, and BESIII experiments.

Comments: 10 pages, 8 figures, comments and suggestions welcome