hidden-charm or hidden-strange exotic mesons*

The q-qbar-s-sbar and q-qbar-c-cbar J^PC=1^--, 1^-+ and charged 1^- systems are investigated by a simplified quark cluster model.
In each of the 1^-- systems, we have found one or more poles performing the 14 possible two-meson channel coupled calculation.
For the q-qbar-c-cbar, a pole appears close to the D₁-Dbar or the ω-χ_c1 thresholds with a small width.
Three poles are found in the q-qbar-s-sbar 1^--, which have a rather larger width.
A pole is found also in the q-qbar-s-sbar 1^-+ systems.
We argue that they can be seeds of the observed exotic mesons such as the Y(4260) resonance.
We are going to discuss also the charged four quark systems in this meeting.