{"paper":{"title":"Measurement of $J/\\psi\\to\\gamma\\eta_{\\rm c}$ decay rate and $\\eta_{\\rm c}$ parameters at KEDR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. A. Osipov, A. A. Ruban, A. A. Talyshev, A. E. Blinov, A. E. Bondar, A. G. Shamov, A. I.Vorobiov, A. K. Barladyan, A. L. Maslennikov, A. M. Sukharev, A. N. Skrinsky, A.N.Yushkov, A. N. Zhuravlev, A. O. Poluektov, A. P. Onuchin, A. R. Buzykaev, A.S. Medvedko, A.V. Bobrov, A.V. Bogomyagkov, A.V. Sokolov, A.Yu. Barnyakov, B. A. Shwartz, D. A. Maksimov, D. N. Shatilov, D.V. Gusev, E. A. Kravchenko, E. A.Kuper, E. A. Simonov, E. B. Levichev, E. M. Baldin, E.V. Starostina, G. A. Savinov, G.E. Pospelov, G. M. Tumaikin, G.V. Karpov, G.Ya.Kurkin, I. B. Nikolaev, I. I. Morozov, I. N. Okunev, I. O. Orlov, I.V. Bedny, I.Yu. Basok, K.Yu.Kotov, K.Yu.Todyshev, M.Yu. Barnyakov, N.Yu. Muchnoi, O. I. Meshkov, O. L. Rezanova, P. A. Piminov, S. A.Kononov, S. A. Nikitin, S. B. Oreshkin, S. E. Baru, S. E. Karnaev, S. G. Pivovarov, S. I. Eidelman, S. I. Mishnev, S.V. Karpov, S.V. Peleganchuk, S.V. Sinyatkin, T. A. Kharlamova, V. A. Kiselev, V. A. Tayursky, V. E. Blinov, V.F. Kulikov, V. G. Prisekin, V. I. Telnov, V. K. Sandyrev, V. M. Aulchenko, V. M. Malyshev, V.N. Zhilich, V. S. Bobrovnikov, V.V.Anashin, V.V. Gulevich, V.V. Neufeld, V.V. Petrov, V.V. Smaluk, V.V. Zhulanov, Yu. A. Tikhonov, Yu. M. Glukhovchenko, Yu.V. Usov","submitted_at":"2014-06-30T09:37:35Z","abstract_excerpt":"Using the inclusive photon spectrum based on a data sample collected at the $J/\\psi$ peak with the KEDR detector at the VEPP-4M $e^+e^-$ collider, we measured the rate of the radiative decay $J/\\psi\\to\\gamma\\eta_{\\rm c}$ as well as $\\eta_{\\rm c}$ mass and width. Taking into account an asymmetric photon lineshape we obtained $\\Gamma^0_{\\gamma\\eta_{\\rm c}}=2.98\\pm0.18 \\phantom{|}^{+0.15}_{-0.33}$ keV, $M_{\\eta_{\\rm c}} = 2983.5 \\pm 1.4 \\phantom{|}^{+1.6}_{-3.6}$ MeV/$c^2$, $\\Gamma_{\\eta_{\\rm c}} = 27.2 \\pm 3.1 \\phantom{|}^{+5.4}_{-2.6}$ MeV."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1406.7644","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}