Measurement of R uds and R between 3.12 and 3.72 GeV at the KEDR detector
В.В. Анашин(Budker Institute of Nuclear Physics), V.M. Aulchenko(Budker Institute of Nuclear Physics), E. M. Baldin(Budker Institute of Nuclear Physics), A.K. Barladyan(Budker Institute of Nuclear Physics), A. Barnyakov(Novosibirsk State University), M.Yu. Barnyakov(Novosibirsk State University), S.E. Baru(Budker Institute of Nuclear Physics), I.Yu. Basok(Budker Institute of Nuclear Physics), A. M. Batrakov(Budker Institute of Nuclear Physics), A. E. Blinov(Budker Institute of Nuclear Physics), V. E. Blinov(Novosibirsk State Technical University), A.V. Bobrov(Novosibirsk State University), V. S. Bobrovnikov(Novosibirsk State University), A. Bogomyagkov(Novosibirsk State University), A. Bondar(Budker Institute of Nuclear Physics), A.A. Borodenko(Budker Institute of Nuclear Physics), А. Р. Бузыкаев(Budker Institute of Nuclear Physics), S.I. Eidelman(Budker Institute of Nuclear Physics), D. N. Grigoriev(Novosibirsk State Technical University), Yu.M. Glukhovchenko(Budker Institute of Nuclear Physics), S.E. Karnaev(Budker Institute of Nuclear Physics), Г. В. Карпов, С. Карпов, P. V. Kasyanenko, T. Kharlamova, В. А. Киселев(Budker Institute of Nuclear Physics), V. V. Kolmogorov(Budker Institute of Nuclear Physics), S.A. Kononov, Khristian Kotov, E. A. Kravchenko, V. Kudryavtsev(Budker Institute of Nuclear Physics), V. Kulikov, G.Ya. Kurkin, I. A. Kuyanov, E.A. Kuper, E. Levichev(Budker Institute of Nuclear Physics), D.A. Maksimov(Novosibirsk State University), В. М. Малышев(Novosibirsk State University), A. L. Maslennikov(Novosibirsk State University), О. И. Мешков, S. I. Mishnev(Budker Institute of Nuclear Physics), И. И. Морозов, N. Yu. Muchnoi, V.V. Neufeld(Budker Institute of Nuclear Physics), S. A. Nikitin, I. B. Nikolaev, I.N. Okunev(Novosibirsk State University), A. P. Onuchin, S.B. Oreshkin(Novosibirsk State University), A. A. Osipov(Budker Institute of Nuclear Physics), I. Ovtin, S. V. Peleganchuk, Vladimir Petrov(Budker Institute of Nuclear Physics), S.G. Pivovarov, P. Piminov, V.G. Prisekin, O. L. Rezanova, A.A. Ruban(Budker Institute of Nuclear Physics), V.K. Sandyrev, G.A. Savinov, A.G. Shamov(Novosibirsk State University), D. Shatilov(Novosibirsk State University), B. Shwartz(Budker Institute of Nuclear Physics), E.A. Simonov, S. V. Sinyatkin, A.N. Skrinsky, A. Sokolov(Budker Institute of Nuclear Physics), A.M. Sukharev(Budker Institute of Nuclear Physics), Е. В. Старостина(Novosibirsk State Technical University), A.A. Talyshev(Budker Institute of Nuclear Physics), V.A. Tayursky(Budker Institute of Nuclear Physics), V. I. Telnov, Yu. A. Tikhonov, K. Yu. Todyshev, G.M. Tumaikin, Y. Usov, A.I. Vorobiov, V. Zhilich(Novosibirsk State University), V.V. Zhulanov(Budker Institute of Nuclear Physics), А. Н. Журавлев
Cited by 31Open Access
Abstract
Using the KEDR detector at the VEPP-4M $e^+e^-$ collider, we have measured the values of $R_{\text{uds}}$ and $R$ at seven points of the center-of-mass energy between 3.12 and 3.72 GeV. The total achieved accuracy is about or better than $3.3\%$ at most of energy points with a systematic uncertainty of about $2.1\%$. At the moment it is the most accurate measurement of $R(s)$ in this energy range.
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