{"paper":{"title":"Measurement of J/psi leptonic width with the KEDR detector","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.Grigoriev, 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.M.Tumaikin, G.V.Karpov, G.Ya.Kurkin, I.B.Nikolaev, I.I.Morozov, I.N.Okunev, I.O.Orlov, I.Yu.Basok, K.Yu.Kotov, K.Yu.Todyshev, M.Yu.Barnyakov, N.Yu.Muchnoi, O.I.Meshkov, O.L.Beloborodova, 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.Kudryavtsev, V.N.Zhilich, V.S.Bobrovnikov, V.V.Anashin, V.V.Gulevich, V.V.Kolmogorov, V.V.Neufeld, V.V.Petrov, V.V.Smaluk, V.V.Zhulanov, Yu.A.Tikhonov, Yu.M.Glukhovchenko, Yu.V.Usov","submitted_at":"2011-10-03T11:54:44Z","abstract_excerpt":"We report a new precise determination of the leptonic widths of the J/psi meson performed with the KEDR detector at the VEPP-4M $e^{+}e^{-}$ collider. The measured values of the J/psi parameters are: \\Gamma_{ee}\\times\\Gamma_{ee}/\\Gamma = 0.3323 \\pm 0.0064 (stat.) \\pm 0.0048 (syst.) keV \\Gamma_{ee}\\times\\Gamma_{\\mu\\mu}/\\Gamma=0.3318 \\pm 0.0052 (stat.) \\pm 0.0063 (syst.) keV. Assuming $e\\mu$ universality and using the table value of the branching ratios the leptonic \\Gamma_{ll}= 5.59 \\pm 0.12 keV width and the total \\Gamma=94.1 \\pm 2.7 keV widths were obtained. We also discuss in detail a method"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1110.0328","kind":"arxiv","version":1},"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"}