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We present a study of the inclusive photon spectrum from 6.3 million J/psi decays collected with the KEDR detector at the VEPP-4M e+e- collider. We measure the branching fraction of the radiative decay J/psi -> eta_c gamma, eta_c width and mass. Taking into account an asymmetric photon line shape we obtain: M(eta_c) = (2978.1 ± 1.4 ± 2.0) MeV/c^2, Gamma(eta_c) = (43.5 ± 5.4 ± 15.8) MeV, B(J/psi->eta_c gamma) = (2.59 ± 0.16 ± 0.31)%$.

生成讲解博客的中文版本

生成AI智能校验的中文版本