$Z_b(10650)$ and $Z_b(10610)$ states in a chiral quark model

TL;DR

This paper uses a chiral quark model to study meson-antimeson systems, predicting bound states that correspond to observed exotic hadrons like Z_b(10610) and Z_b(10650).

Contribution

It provides a systematic theoretical analysis of meson-antimeson interactions, interpreting certain exotic states as molecular bound states within a chiral quark framework.

Findings

Attractive interactions lead to bound states in studied systems.

Z_b(10610) and Z_b(10650) are interpreted as Bar{B}^* and B^*ar{B}^* molecules.

Dar{D}^* and D^*ar{D}^* form molecular states corresponding to X(3872) and Y(3940).

Abstract

We perform a systematic study of $B\bar{B}^*$, $B^*\bar{B}^*$, $D\bar{D}^*$ and $D^*\bar{D}^*$ systems by using effective interaction in our chiral quark model. Our results show that the interactions of $B\bar{B}^*$, $B^*\bar{B}^*$, $D\bar{D}^*$ and $D^*\bar{D}^*$ states are attractive, which consequently result in $B\bar{B}^*$, $B^*\bar{B}^*$, $D\bar{D}^*$ and $D^*\bar{D}^*$ bound states. The recent observed exotic-like hadrons of $Z_b(10610)$ and $Z_b(10650)$ are, therefore in our approach, interpreted as loosely bound states of $B\bar{B}^*$ and $B^*\bar{B}^*$, while X(3872) and Y(3940) are $D\bar{D}^*$ and $D^*\bar{D}^*$ molecule states, respectively.