{"paper":{"title":"Measurement of B(J/psi->eta_c gamma) 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. Milstein, 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. 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. 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. I. Skovpen, Yu. M. Glukhovchenko, Yu. V. Usov","submitted_at":"2010-12-08T07:11:20Z","abstract_excerpt":"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)%$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.1694","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"}