Search for C-parity violation in J/ψ → γγ and γφ
CitationKolcu, O. B. (2014). Search for C-parity violation in J/ψ → γγ and γφ. Physical Review. 90.9
Using 1.06×108 ψ(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/ψ→γγ and γϕ decays via ψ(3686)→J/ψπ+π−. No significant signals are observed in either channel. Upper limits on the branching fractions are set to be B(J/ψ→γγ)<2.7×10−7 and B(J/ψ→γϕ)<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.