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arxiv: 1510.02667 · v2 · pith:CGNJZNW3new · submitted 2015-10-08 · ✦ hep-ex

Measurement of R_(uds) and R between 3.12 and 3.72 GeV at the KEDR detector

V.V. Anashin , V.M. Aulchenko , E.M. Baldin , A.K. Barladyan , A.Yu. Barnyakov , M.Yu. Barnyakov , S.E. Baru , I.Yu. Basok
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A.M. Batrakov A.E. Blinov V.E. Blinov A.V. Bobrov V.S. Bobrovnikov A.V. Bogomyagkov A.E. Bondar A.R. Buzykaev S.I. Eidelman D.N. Grigoriev Yu.M. Glukhovchenko S.E. Karnaev G.V. Karpov S.V. Karpov P.V. Kasyanenko T.A. Kharlamova V.A. Kiselev V.V. Kolmogorov S.A. Kononov K.Yu. Kotov E.A. Kravchenko V.N. Kudryavtsev V.F. Kulikov G.Ya. Kurkin I.A. Kuyanov E.B. Levichev D.A. Maksimov V.M. Malyshev A.L. Maslennikov O.I. Meshkov S.I. Mishnev I.I. Morozov N.Yu. Muchnoi V.V. Neufeld S.A. Nikitin I.B. Nikolaev I.N. Okunev A.P. Onuchin S.B. Oreshkin A.A. Osipov I.V. Ovtin S.V. Peleganchuk S.G. Pivovarov P.A. Piminov V.V. Petrov V.G. Prisekin O.L. Rezanova A.A. Ruban V.K. Sandyrev G.A. Savinov A.G. Shamov D.N. Shatilov B.A. Shwartz E.A. Simonov S.V. Sinyatkin A.N. Skrinsky A.V. Sokolov A.M. Sukharev E.V. Starostina A.A. Talyshev V.A. Tayursky V.I. Telnov Yu.A. Tikhonov K.Yu. Todyshev G.M. Tumaikin Yu.V. Usov A.I. Vorobiov V.N. Zhilich V.V. Zhulanov A.N. Zhuravlev
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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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