Recent $J/\psi$ Results from BESII

TL;DR

This paper reports recent results from BESII on $J/$ decays, including studies of multi-quark candidates, light scalar mesons, excited baryons, and searches for lepton flavor violation and pentaquark states, based on extensive data.

Contribution

It provides new measurements and searches related to $J/$ decays, expanding understanding of exotic states and rare processes with a large dataset.

Findings

Measurements of $J/$ and $$ decays

Searches for lepton flavor violation

Searches for pentaquark states

Abstract

The studies on the multi-quark candidates, light scalar mesons and excited baryon states at BES are presented, based on $5.8 \times 10^7$ $J/\psi$ data collected with BESII detector. The measurements of some $J/\psi$ and $\eta_c$ decays are presented too. We also report the searches for the lepton flavor violation and pentaquark states in $J/\psi$ decays.