Using (223.7±1.4)×106 J/ψ events accumulated with the BESIII detector, we study ηc decays to φφ and ωφ final states. The branching fraction of ηc→φφ is measured to be Br(ηc→φφ)=(2.5±0.3-0.7+0.3±0.6)×10-3, where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of Br(J/ψ→γηc). No significant signal for the double Okubo-Zweig-Iizuka suppressed decay of ηc→ωφ is observed, and the upper limit on the branching fraction is determined to be Br(ηc→ωφ)<2.5×10-4 at the 90% confidence level.
Bibliographical noteFunding Information:
This work is supported in part by National Key Basic Research Program of China under Contract No.2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No.11505034, No.11375205, No.11565006, No.11647309, No.11125525, No.11235011, No.11322544, No.11335008, No.11425524, and 11305090; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); the Collaborative Innovation Center for Particles and Interactions (CICPI); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No.11179007, No.U1232201, and No.U1332201; CAS under Contracts No.KJCX2-YW-N29 and No.KJCX2-YW-N45; 100 Talents Program of CAS; National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Collaborative Research Center (CRC) Contracts No.1044 and No.FOR 2359; Istituto Nazionale di Fisica Nucleare
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