Search for C-Parity Violation in J/ψ → γγ and γϕ


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.



J/ψ Mesons (J/psi), Branching fractions (Nuclear physics), Photons

National Key Basic Research Program of China (2015CB856700); Joint Funds of the National Natural Science Foundation of China (11079008, 11179007, U1232201, U1332201); National Natural Science Foundation of China (NSFC) (11205082, 11475090, 10935007, 11121092, 11125525, 11235011, 11322544, 11335008); Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program (KJCX2-YW-N29, KJCX2-YW-N45); German Research Foundation DFG under Contract No. Collaborative Research Center (CRC-1044); Ministry of Development of Turkey (DPT2006K-120470); Russian Foundation for Basic Research (14-07-91152); US Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118); WCU Program of the National Research Foundation of Korea (32-2008-000-10155-0).


©2014 American Physical Society