Dynamical study of $S$-wave $\bar{Q}Q\bar{q}q$ system

TL;DR

This study investigates the energy spectra of $S$-wave $ar{Q}Qar{q}q$ systems using two quark models, identifying potential bound states that correspond to experimentally observed exotic mesons.

Contribution

It provides a detailed analysis of possible bound states in $ar{Q}Qar{q}q$ systems, including their quantum numbers and relation to known exotic states, within two constituent quark models.

Findings

Identification of bound states matching $Z_b$ and $Z_c$ mesons.

Prediction of new bound states in specific color channels.

Correlation of theoretical states with experimental exotic mesons.

Abstract

We perform the energy spectra calculating for the $S$-wave $\bar{Q}Q\bar{q}q$ (where $Q=c,b$ and $q=u,d,s$) system within two constituent quark models. The bound states of $B^*\bar{B}^*$ with $I(J^{PC})=1(0^{++}),~1(1^{+-}),~0(2^{++})$ and $B\bar{B}^*$ with isospin $I=1$, or $0$ are obtained in color-singlet-singlet channel. If considering the coupling of color channels, apart from the deep bound states appear in $[b\bar{q}]^{(*)}[q\bar{b}]^{(*)}$ scenario, a bound state $[c\bar{q}]^*[q\bar{c}]^*$ with $I(J^{PC})=1(0^{++})$ is also formed. The $B\bar{B}^*$ and the $B^*\bar{B}^*$ with quantum number $1(1^{+-})$ are well candidates for $Z_b^{\pm}(10610)$ and $Z_b^{\pm}(10650)$ reported by Belle collaboration respectively, while the $B\bar{B}^*$ with isospin $0$ can be interpret as a candidate for $Z_b^{0}(10610)$. A bound state $[c\bar{q}]^*[q\bar{c}]^*$ with $I(J^{PC})=1(0^{++})$ is comparable with $Z_c^{+}(4025)$ announced by BES.