The charged $Z_c$ and $Z_b$ structures in a constituent quark model approach

Abstract

The nature of the recently discovered $Z_c$ and $Z_b$ structures is intriguing. Their charge forces its minimal quark content to be $Q\bar{Q}q\bar{q}$ (where $Q=\{c,b\}$ and $q=\{u,d\}$). In this work we perform a molecular coupled-channels calculation of the $I^G(J^{PC})=1^{+}(1^{+-})$ charm and bottom sectors in the framework of a constituent quark model which satisfactorily describes a wide range of properties of (non-)conventional hadrons containing heavy quarks. All the relevant channels are included for each sector, i.e.: The $D^{(\ast )}{\bar{D}}^{\ast }+h.c.$, $\pi J/\psi$ and $\rho {\eta }_c$ channels for the $Z_c$ and $B^{(\ast )}{B}^{\ast }$ and ${\rm Y}(nS)\pi$ ($n=1,2,3$) channels for the $Z_b$ analysis. Possible structures of these resonances will be discussed.

Comments: 10 pages, 2 tables, 7 figures. Proceedings of the 24th European Conference on Few-Body Problems in Physics