On the origin of Y(4260) and the $J^{PC}=1^{--}$ exotic mesons

Abstract

The qqss and qqcc JPC = 1−− systems are investigated by 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. In each of the qqss and qqcc systems, one or more poles have been found. For the qqcc, a pole with a very narrow width appears very close to the ωχc1 threshold, which is also close to the DD1 and DD1 thresholds. There are two poles in the qqss, both of which have a rather larger width. We argue that they can be seeds of the observed exotic mesons like the Y (4260).