Analysis of Y (4660) and Related Bound States with QCD Sum Rules

In this article, we take the vector charmonium-like state Y (4660) as a psi'f(0)(980) bound state (irrespective of the hadro-charmonium and the molecular state) tentatively, and study its mass using the QCD sum rules. The numerical value M-Y = 4.71 +/- 0.26 GeV is consistent with the experimental data. Considering the SU(3) symmetry of the light flavor quarks and the heavy quark symmetry, we also study the bound states psi'sigma(400-1200), (sic)''' f(0)(980), and (sic)'''sigma(400-1200) with the QCD sum rules, and make reasonable predictions for their masses.