Recent $J/\psi$ Results from Bes II

TL;DR

This paper reports recent results from BES II on J/psi decays, including multiquark candidate signals, light scalar mesons, excited baryon states, and decay measurements, contributing to understanding non-standard hadronic phenomena.

Contribution

It presents new experimental findings from BES II on multiquark candidates and light mesons, expanding knowledge of J/psi decay channels and exotic states.

Findings

Observation of threshold enhancements possibly indicating multiquark states

Contributions to light scalar meson spectroscopy, including sigma and kappa

Measurements of J/psi decay modes and excited baryon states

Abstract

Multiquark searches have been a hot topic in recent years. Some threshold enhancements were observed during the analysis of 58M $\jpsi$ events collected by BES II detector. These enhancements can't be explained by the standard model and may be candidates of multiquark. BES also contribute a lot to the study of light scalar mesons, such as $\sigma$,$\kappa$,$f_{0}(1370)$ and $f_{0}(1710)$ etc. Study of the excited baryon states and measurements of some $\jpsi$ decays are also done with the $\jpsi$ events of BES.