Report on scipost_201910_00022v1

Abstract

The nature of the recently discovered Z c and Z b structures is intriguing. Their charge forces its minimal quark content to be QQqq (where Q = {c, b} and q = {u, d}). In this work we perform a molecular coupled-channels calculation of the I G (J P C ) = 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 ( * )D * +h.c., πJ/ψ and ρη c channels for the Z c and B ( * ) B * and Υ (nS)π (n = 1, 2, 3) channels for the Z b analysis. Possible structures of these resonances will be discussed.