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Physical Review D
Using 1.06×10^8 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.doi:10.1103/physrevd.90.092002 fatcat:vtj6z4w6nbf7jgosdemyhesfbm