Search for C-parity violation in J/? › ?? and ??

Abstract

Using 1.06×108 ?(3686) events recorded in e+e- collisions at s?=3.686??GeV with the BESIII at the BEPCII collider, we present searches for C-parity violation in J/?›?? and ?? decays via ?(3686)›J/??+?-. No significant signals are observed in either channel. Upper limits on the branching fractions are set to be B(J/?›??)<2.7×10-7 and B(J/?›??)<1.4×10-6 at the 90% confidence level. The former is one order of magnitude more stringent than the previous upper limit, and the latter represents the first limit on this decay channel.