Theory Overview on Spectroscopy

TL;DR

This paper provides a theoretical overview of exotic spectroscopy in the charm and beauty quark sectors, focusing on recent discoveries and the tetraquark interpretation of certain states.

Contribution

It reviews theoretical analyses of Belle data suggesting some exotic states are tetraquarks, offering insights into their nature and properties.

Findings

Identification of $Y_b(10890)$, $Z_b(10610)$, and $Z_b(10650)$ as tetraquark candidates

Review of Belle experimental data in the tetraquark framework

Discussion on the nature of exotic states in heavy quark spectroscopy

Abstract

A theoretical overview of the exotic spectroscopy in the charm and beauty quark sector is presented. These states are unexpected harvest from the $e^+e^-$ and hadron colliders and a permanent abode for the majority of them has yet to be found. We argue that some of these states, in particular the $Y_b(10890)$ and the recently discovered states $Z_b(10610)$ and $Z_b(10650)$, discovered by the Belle collaboration are excellent candidates for tetraquark states $[bq][\bar{b}\bar{q}]$, with $q=u,d$ light quarks. Theoretical analyes of the Belle data carried out in the tetraquark context is reviewed.