Charmonia and exotics from BESIII

Abstract

Several states that couple to one light-meson and a heavy-charmonium are recently reported, including the $Z_c(3900)$ and $Z_c(4020)$. These states cannot be interpreted within the constituent quark-model of mesons, and are good candidates for a new form of quark matter, four-quark matter. A review of recent results on new charmonium-like states studied at BESIII is presented.

Comments: To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 2015