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From these signals, we determine the mass of $\\eta_c$ to be $2976.6\\pm2.9\\pm1.3$ MeV. Combining this result with a previously reported result from a similar study using $\\psi(2S)\\to\\gamma\\eta_c$ detected in the same spectrometer gives $m_{\\eta_c} = 2976.3\\pm2.3\\pm1.2$ MeV. 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(BES Collaboration), J. Z. Bai","submitted_at":"2000-02-03T08:45:07Z","abstract_excerpt":"In a sample of 7.8 million $J/\\psi$ decays collected in the Beijing Spectrometer, the process J/$\\psi\\to\\gamma\\eta_c$ is observed for five different $\\eta_c$ decay channels: $K^+K^-\\pi^+\\pi^-$, $\\pi^+\\pi^-\\pi^+\\pi^-$, $K^\\pm K^0_S \\pi^\\mp$ (with $K^0_S\\to\\pi^+\\pi^-$), $\\phi\\phi$ (with $\\phi\\to K^+K^-$) and $K^+K^-\\pi^0$. From these signals, we determine the mass of $\\eta_c$ to be $2976.6\\pm2.9\\pm1.3$ MeV. Combining this result with a previously reported result from a similar study using $\\psi(2S)\\to\\gamma\\eta_c$ detected in the same spectrometer gives $m_{\\eta_c} = 2976.3\\pm2.3\\pm1.2$ MeV. 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