Physics Letters B (Nov 2014)

Measurement of J/ψ→γηc decay rate and ηc parameters at KEDR

  • V.V. Anashin,
  • V.M. Aulchenko,
  • E.M. Baldin,
  • A.K. Barladyan,
  • A.Yu. Barnyakov,
  • M.Yu. Barnyakov,
  • S.E. Baru,
  • I.Yu. Basok,
  • I.V. Bedny,
  • A.E. Blinov,
  • V.E. Blinov,
  • A.V. Bobrov,
  • V.S. Bobrovnikov,
  • A.V. Bogomyagkov,
  • A.E. Bondar,
  • A.R. Buzykaev,
  • S.I. Eidelman,
  • Yu.M. Glukhovchenko,
  • V.V. Gulevich,
  • D.V. Gusev,
  • S.E. Karnaev,
  • G.V. Karpov,
  • S.V. Karpov,
  • T.A. Kharlamova,
  • V.A. Kiselev,
  • S.A. Kononov,
  • K.Yu. Kotov,
  • E.A. Kravchenko,
  • V.F. Kulikov,
  • G.Ya. Kurkin,
  • E.A. Kuper,
  • E.B. Levichev,
  • D.A. Maksimov,
  • V.M. Malyshev,
  • A.L. Maslennikov,
  • A.S. Medvedko,
  • 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,
  • I.O. Orlov,
  • A.A. Osipov,
  • S.V. Peleganchuk,
  • S.G. Pivovarov,
  • P.A. Piminov,
  • V.V. Petrov,
  • A.O. Poluektov,
  • G.E. Pospelov,
  • 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,
  • V.V. Smaluk,
  • 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,
  • A.N. Yushkov,
  • V.N. Zhilich,
  • V.V. Zhulanov,
  • A.N. Zhuravlev

Journal volume & issue
Vol. 738
pp. 391 – 396

Abstract

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Using the inclusive photon spectrum based on a data sample collected at the J/ψ peak with the KEDR detector at the VEPP-4M e+e− collider, we measured the rate of the radiative decay J/ψ→γηc as well as ηc mass and width. Taking into account an asymmetric photon lineshape we obtained Γγηc0=2.98±0.18−0.33+0.15keV, Mηc=2983.5±1.4−3.6+1.6MeV/c2, Γηc=27.2±3.1−2.6+5.4MeV. Keywords: Charmonium, Radiative decays