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

by P. G. Ortega, J. Segovia, D. R. Entem and F. Fernández

Submission summary

As Contributors:	Pablo G. Ortega
Preprint link:	scipost_201910_00022v2
Date accepted:	2020-01-27
Date submitted:	2019-12-19
Submitted by:	G. Ortega, Pablo
Submitted to:	SciPost Physics Proceedings
Proceedings issue:	24th European Few Body Conference (University of Surrey, U.K.)
Discipline:	Physics
Subject area:	High-Energy Physics - Phenomenology
Approach:	Theoretical

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

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