Charmonium and bottomonium spectroscopy at Belle II

TL;DR

Belle II is a powerful upgraded collider experiment that has begun collecting extensive data, enabling detailed study of heavy exotic hadrons like XYZ particles and advancing understanding of quarkonium physics.

Contribution

This paper reports initial results from Belle II, highlighting its capabilities to explore exotic and conventional quarkonium states with unprecedented data volume.

Findings

First results on XYZ particles from Belle II data

Enhanced understanding of heavy quarkonium spectroscopy

Future prospects for exotic hadron research

Abstract

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+e^-$ collider is an upgrade of the B factory facility at KEK in Tsukuba, Japan. The experiment began operation in 2019 and aims to record a factor of 50 times more data than its predecessor. Belle II is uniquely capable of studying the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle, these now number in the dozens, and represent the emergence of a new category within quantum chromodynamics. We present recent results obtained from Belle II data, and the future prospects to explore both exotic and conventional quarkonium physics.