Recent Results on J/\psi Decays from BESII

TL;DR

This paper reports new observations of X(1835) from BESII and provides improved measurements of J/ and ta_c decays, including first-time measurements for some channels.

Contribution

It presents the first observation of X(1835) and enhances the precision of J/ and ta_c decay measurements, expanding knowledge of charmonium decays.

Findings

Observation of X(1835) in  decays.

Improved measurements of  and ta_c decay channels.

First measurements for some decay modes.

Abstract

The new observation of X(1835)is reported using 58 million $\jpsi$ events collected at BES II detector. We also present the measurements of J/\Psi and eta_c decays, of them some are the first measurements and some improve the precision in previous measurements.