Search for C-Parity Violation in J/ψ → γγ and γϕ
Achasov, M. N.
Ai, X. C.
Ambrose, D. J.
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Using 1.06 x 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/ψ π⁺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 x 10⁻⁷ and ℬ(J/ψ → γϕ) < 1.4 x 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.