Structure of the Hidden-Charm Exotic Vector Mesons

We study the \(q\bar{q}c\bar{c}\) \(J^{PC} = 1^{ - - }\) isospin 0 systems using a quark hadron hybrid model, where the 14 relevant two-meson channels are coupled, while the quark degrees of freedom appear in the short range region. We find a pole near the \(\omega \chi _{c1}\), \(\bar{D}D_{1}\), and \(\bar{D}D'_{1}\) thresholds with a very small width. We further estimate the effects of the coupling between this two-meson hadronic molecular state and the \(\psi (3S)\) and \(\psi (4S)\) states and find it reduces the molecule mass a little. Although the calculated mass of this molecular state is still considerably higher than the observed \(Y(4260)\), we argue that it can be a part of the \(Y(4260)\) components.