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  • Measurement of J/ψ→ηcγ at KEDR
    Anashin, V. V; Aulchenko, V. M; Baldin, E. M; Barladyan, A. K; Barnyakov, A. Yu; Barnyakov, M. Yu; Baru, S. E; Bedny, I. V; Beloborodova, O. L; Blinov, A. E; Blinov, V. E; Bobrov, A. V; Bobrovnikov, V. S; Bogomyagkov, A. V; Bondar, A. E; Buzykaev, A. R; Eidelman, S. I; Glukhovchenko, Yu. M; Gulevich, V. V; Gusev, D. V; Karnaev, S. E; Karpov, G. V; Karpov, S. V; Kharlamova, T. A; Kiselev, V. A; Kononov, S. A; Kotov, K. Yu; Kravchenko, E. A; Kulikov, V. F; Kurkin, G. Ya; Kuper, E. A; Levichev, E. B; Maksimov, D. A; Malyshev, V. M; Maslennikov, A. L; Medvedko, A. S; Meshkov, O. I; Milstein, A. I; Mishnev, S. I; Morozov, I. I; Muchnoi, N. Yu; Neufeld, V. V; Nikitin, S. A; Nikolaev, I. B; Okunev, I. N; Onuchin, A. P; Oreshkin, S. B; Orlov, I. O; Osipov, A. A; Peleganchuk, S. V; Pivovarov, S. G; Piminov, P. A; Petrov, V. V; Poluektov, A. O; Popkov, I. N; Pospelov, G. E; Prisekin, V. G; Ruban, A. A; Sandyrev, V. K; Savinov, G. A; Shamov, A. G; Shatilov, D. N; Shwartz, B. A; Simonov, E. A; Sinyatkin, S. V; Skovpen, Yu. I; Skrinsky, A. N; Smaluk, V. V; Sokolov, A. V; Sukharev, A. M; Starostina, E. V; Talyshev, A. A; Tayursky, V. A; Telnov, V. I; Tikhonov, Yu. A; Todyshev, K. Yu; Tumaikin, G. M; Usov, Yu. V; Vorobiov, A. I; Yushkov, A. N; Zhilich, V. N; Zhulanov, V. V; Zhuravlev, A. N

    Chinese physics C, 06/2010, Letnik: 34, Številka: 6
    Journal Article

    We present a study of the inclusive photon spectra from 5.9 million J/ψ decays collected with the KEDR detector at the VEPP-4M e+e collider. We measure the branching fraction of radiative decay J/ψ→ηcγ, ηc width and mass. Our preliminary results are: M(ηc) = 2979.4± 1.5 ± 1.9 MeV/c^2, Г(ηc) = 27.8±5.1 ±3.3 MeV, B(Jψ→ηcγ) = (2.34±0.15±0.40)%.