Charmonium and Bottomonium at $e^+e^-$ colliders

TL;DR

This paper reviews recent experimental results on charmonium and bottomonium spectroscopy from B-factories, highlighting new measurements of eta_c states and radiative transitions from upsilon states.

Contribution

It provides a comprehensive overview of recent experimental findings, emphasizing new measurements and transition processes in heavy quarkonium systems.

Findings

New eta_c(1S) and eta_c(2S) measurements

Observation of radiative transitions from Υ(2S) and Υ(3S)

Enhanced understanding of heavy quarkonium spectroscopy

Abstract

We review recent charmonium and bottomonium spectroscopy results from the B-factories Belle and \babar. A particular focus is given to the new $\eta_{c}(1S)$ and $\eta_{c}(2S)$ measurement and to the radiative transitions from $\Upsilon (2S)$ and $\Upsilon (3S)$ with converted photons.