Experimental Advances on Light Baryon Spectroscopy at BESIII Experiment

TL;DR

BESIII's extensive data collection in the tau-charm energy region has led to significant progress in light baryon spectroscopy, including discoveries of various excited baryon states.

Contribution

This review highlights BESIII's recent experimental breakthroughs in baryon spectroscopy, expanding the known baryon spectrum and supporting non-perturbative QCD studies.

Findings

Discovery of excited nucleon states

Identification of $\\Lambda$ and $\\Sigma$ hyperon states

Observation of $\\Xi$ and $\\Omega^{-}$ hyperon states

Abstract

The BESIII experiment is currently the world's only electron-positron collider operating in the tau-charm physical energy region. Since starting data taking in 2009, BESIII has accumulated the world's largest data set in the center-of-mass energy range of 1.84-4.95 GeV, including approximately 10 billion $J/\psi$ events and 3 billion $\psi(3686)$ events, together with extensive data on open-charm hadron pair production near threshold regions. These unique datasets, characterized by high statistics and low background, provide unprecedented experimental conditions for studying light baryon spectroscopy. This article systematically reviews the progress made by BESIII in baryon spectroscopy, with a focus on recent breakthrough achievements, including the discovery of excited nucleon states, $\Lambda$ hyperon states, $\Sigma$ hyperon states, $\Xi$ hyperon states and $\Omega^{-}$ hyperon states. These results expand the spectrum of baryon excited states and provide crucial experimental support for understanding non-perturbative QCD and resolving the ``missing baryon resonances'' problem.