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 ${\psi }^{\mathrm{\prime }}{f}_0(980)$ bound state (irrespective of the hadro-charmonium and the molecular state) tentatively, study its mass using the QCD sum rules, the numerical value $M_Y=4.71\pm 0.26\mathrm{G}\mathrm{e}\mathrm{V}$ 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 ${\psi }^{\mathrm{\prime }}\sigma (400-1200)$, ${\mathrm{{\rm Y}}}^{\mathrm{\prime }}\mathrm{"}{f}_0(980)$ and $\mathrm{{\rm Y}}{\mathrm{"}}^{\mathrm{\prime }}\sigma (400-1200)$ with the QCD sum rules, and make reasonable predictions for their masses.