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

TL;DR

This paper investigates the nature of the $Z_c$ and $Z_b$ charged structures using a constituent quark model, performing coupled-channels calculations to understand their resonance structures in charm and bottom sectors.

Contribution

It provides a detailed molecular coupled-channels analysis of $Z_c$ and $Z_b$ structures within a constituent quark model framework, including all relevant channels.

Findings

Identifies possible resonance structures for $Z_c$ and $Z_b$.

Includes comprehensive channel analysis for both charm and bottom sectors.

Offers insights into the nature of these exotic hadrons.

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 $\Upsilon(nS)\pi$ ($n=1,2,3$) channels for the $Z_b$ analysis. Possible structures of these resonances will be discussed.