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[en] The resonance parameters of the charmonium ground state, ηc(11S0), have been measured by means of the reaction p-bar p→ηc→γγ. The mass and total width are determined to be 2984.1±2.1±1.0 MeV/c2 and 20.4+7.7-6.7±2.0 MeV, respectively. The product of branching ratios B(p-bar p→ηc)B(ηc→γγ) is determined to be 22.4+3.8-3.7±2.0x10-8, from which B(ηc→γγ)=1.87+0.32+0.95-0.31-0.50x10-4, and Γ(ηc→γγ)=3.8+1.1+1.9-1.0-1.0 keV are derived using B(ηc→p-bar p)=(12±4)x10-4 from the literature.
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