ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 90, p. -
Search for C -parity violation in J /ψ →γγ and γφ
© 2014 American Physical Society. Using 1.06×108 ψ(3686) events recorded in e+e- collisions at s=3.686GeV 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.