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Precise measurement of Ruds and R between 1.84 and 3.72 GeV at the KEDR detector

2018; Elsevier BV; Volume: 788; Linguagem: Inglês

10.1016/j.physletb.2018.11.012

1873-2445

В.В. Анашин, О. В. Анчугов, V.M. Aulchenko, E. M. Baldin, G. N. Baranov, A.K. Barladyan, A. Barnyakov, M.Yu. Barnyakov, S.E. Baru, I.Yu. Basok, A. M. Batrakov, E. A. Bekhtenev, A. E. Blinov, V. E. Blinov, A. V. Bobrov, V. S. Bobrovnikov, A. Bogomyagkov, A. Bondar, А. Р. Бузыкаев, P. B. Cheblakov, Viktor Dorohov, S.I. Eidelman, D.N. Grigoriev, S. Glukhov, V. V. Kaminskiy, S.E. Karnaev, Г. В. Карпов, С. Карпов, K. Yu. Karukina, D. P. Kashtankin, P.V. Kasyanenko, T. Kharlamova, В. А. Киселев, V. V. Kolmogorov, S.A. Kononov, Khristian Kotov, А. А. Краснов, E. A. Kravchenko, V. Kudryavtsev, V. Kulikov, G.Ya. Kurkin, I.A. Kuyanov, E. Levichev, D.A. Maksimov, В. М. Малышев, A. L. Maslennikov, О. И. Мешков, S. I. Mishnev, I. Morozov, И. И. Морозов, S. A. Nikitin, I. B. Nikolaev, I.N. Okunev, A. P. Onuchin, S.B. Oreshkin, A. A. Osipov, I. Ovtin, S. V. Peleganchuk, S.G. Pivovarov, P. Piminov, Vladimir Petrov, V.G. Prisekin, O. L. Rezanova, A.A. Ruban, G.A. Savinov, A.G. Shamov, D. Shatilov, Д. А. Шведов, B. Shwartz, E.A. Simonov, S. Sinyatkin, A.N. Skrinsky, A. Sokolov, D. P. Sukhanov, A.M. Sukharev, E.V. Starostina, A.A. Talyshev, V.A. Tayursky, V. I. Telnov, Yu. A. Tikhonov, K. Yu. Todyshev, A. Tribendis, G.M. Tumaikin, Y. Usov, A.I. Vorobiov, V. Zhilich, А. А. Жуков, V.V. Zhulanov, А. Н. Журавлев,

Quantum Chromodynamics and Particle Interactions

The present work continues a series of the KEDR measurements of the $R$ value that started in 2010 at the VEPP-4M $e^+e^-$ collider. By combining new data with our previous results in this energy range we measured the values of $R_{\text{uds}}$ and $R$ at nine center-of-mass energies between 3.08 and 3.72 GeV. The total accuracy is about or better than $2.6\%$ at most of energy points with a systematic uncertainty of about $1.9\%$. Together with the previous precise $R$ measurement at KEDR in the energy range 1.84-3.05 GeV, it constitutes the most detailed high-precision $R$ measurement near the charmonium production threshold.