Physics Letters B (2019-01-01)

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

  • V.V. Anashin,
  • O.V. Anchugov,
  • V.M. Aulchenko,
  • E.M. Baldin,
  • G.N. Baranov,
  • A.K. Barladyan,
  • A.Yu. 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.V. Bogomyagkov,
  • A.E. Bondar,
  • A.R. Buzykaev,
  • P.B. Cheblakov,
  • V.L. Dorohov,
  • S.I. Eidelman,
  • D.N. Grigoriev,
  • S.A. Glukhov,
  • V.V. Kaminskiy,
  • S.E. Karnaev,
  • G.V. Karpov,
  • S.V. Karpov,
  • K.Yu. Karukina,
  • D.P. Kashtankin,
  • P.V. Kasyanenko,
  • T.A. Kharlamova,
  • V.A. Kiselev,
  • V.V. Kolmogorov,
  • S.A. Kononov,
  • K.Yu. Kotov,
  • A.A. Krasnov,
  • 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.A. Morozov,
  • I.I. Morozov,
  • 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,
  • G.A. Savinov,
  • A.G. Shamov,
  • D.N. Shatilov,
  • D.A. Shvedov,
  • B.A. Shwartz,
  • E.A. Simonov,
  • S.V. Sinyatkin,
  • A.N. Skrinsky,
  • A.V. 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.G. Tribendis,
  • G.M. Tumaikin,
  • Yu.V. Usov,
  • A.I. Vorobiov,
  • V.N. Zhilich,
  • A.A. Zhukov,
  • V.V. Zhulanov,
  • A.N. Zhuravlev

Journal volume & issue
Vol. 788
pp. 42 – 51

Abstract

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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 Ruds 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.