Holographic stability for non-$q\bar{q}$ candidates

TL;DR

This paper uses configurational entropy within a softwall AdS/QCD model to analyze the stability and structure of heavy non-quark-antiquark mesons, providing insights into their exotic configurations.

Contribution

It introduces a parametrization of multiquark and exotic mesons using a non-quadratic softwall model to describe their stability and structure.

Findings

$Z_c$ is best described as a hybrid meson with a gluon tube.

$ au$ is best described as hadrocharmonium.

$Z_b$ is best described as a hadronic molecule.

Abstract

In the context of bottom-up AdS/QCD models, we discuss how the configurational entropy can describe heavy non-$q\,\bar{q}$ states. Using the non-quadratic softwall model, introduced to describe non-linear Regge trajectories, we parametrize different multiquark and exotic meson structures to describe $Z_c$, $\psi$, and $Z_b$ states as non-$q\,\bar{q}$ hadrons in terms of stability. We found that $Z_c$ is better described as a hybrid meson with one gluon tube, $\psi$ as hadrocharmonium, and $Z_b$ as hadronic molecule.