Mixing of X and Y states from QCD sum rules analysis * *Supported by NSFC (11175153, 11205093) and the Natural Sciences and Engineering Research Council of Canada (NSERC)

Abstract

We study and states as mixed states in QCD sum rules. By calculating the two-point correlation functions of pure states of their corresponding currents, we review the mass and coupling constant predictions of , , and states. By calculating the two-point mixed correlation functions of and currents, we estimate the mass and coupling constants of the corresponding "physical state" that couples to both and currents. Our results suggest that for states, the and components are more likely to mix, while for and states, there is less mixing between and . Our results suggest the Y series of states have more complicated components.