Observation of $\eta_c\to\omega\omega$ in $J/\psi\to\gamma\omega\omega$

Abstract

Using a sample of (1310.6±7.0)×106 J/ψ events recorded with the BESIII detector at the symmetric electron positron collider BEPCII, we report the observation of the decay of the (11S0) charmonium state ηc into a pair of ω mesons in the process J/ψ→γωω. The branching fraction is measured for the first time to be B(ηc→ωω)=(2.88±0.10±0.46±0.68)×10−3, where the first uncertainty is statistical, the second systematic and the third is from the uncertainty of B(J/ψ→γηc). The mass and width of the ηc are determined as M=(2985.9±0.7±2.1)MeV/c2 and Γ=(33.8±1.6±4.1)MeV.