Physics Letters B (Jan 2015)

Search for the process e+e−→η′(958) with the CMD-3 detector

  • R.R. Akhmetshin,
  • A.V. Anisenkov,
  • V.M. Aulchenko,
  • V.Sh. Banzarov,
  • N.S. Bashtovoy,
  • D.E. Berkaev,
  • A.E. Bondar,
  • A.V. Bragin,
  • S.I. Eidelman,
  • D.A. Epifanov,
  • L.B. Epshteyn,
  • A.L. Erofeev,
  • G.V. Fedotovich,
  • S.E. Gayazov,
  • A.A. Grebenuk,
  • D.N. Grigoriev,
  • E.N. Gromov,
  • F.V. Ignatov,
  • S.V. Karpov,
  • V.F. Kazanin,
  • B.I. Khazin,
  • I.A. Koop,
  • O.A. Kovalenko,
  • A.N. Kozyrev,
  • E.A. Kozyrev,
  • P.P. Krokovny,
  • A.E. Kuzmenko,
  • A.S. Kuzmin,
  • I.B. Logashenko,
  • P.A. Lukin,
  • K.Yu. Mikhailov,
  • N.Yu. Muchnoi,
  • V.S. Okhapkin,
  • Yu.N. Pestov,
  • E.A. Perevedentsev,
  • A.S. Popov,
  • G.P. Razuvaev,
  • Yu.A. Rogovsky,
  • A.L. Romanov,
  • A.A. Ruban,
  • N.M. Ryskulov,
  • A.E. Ryzhenenkov,
  • V.E. Shebalin,
  • D.N. Shemyakin,
  • B.A. Shwartz,
  • D.B. Shwartz,
  • A.L. Sibidanov,
  • P.Yu. Shatunov,
  • Yu.M. Shatunov,
  • E.P. Solodov,
  • V.M. Titov,
  • A.A. Talyshev,
  • A.I. Vorobiov,
  • Yu.V. Yudin

Journal volume & issue
Vol. 740
pp. 273 – 277

Abstract

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A search for the process e+e−→η′(958) in the π+π−η→π+π−γγ final state has been performed with the CMD-3 detector at the VEPP-2000 e+e− collider. Using an integrated luminosity of 2.69 pb−1 collected at the center-of-mass energy Ec.m.=957.68 MeV we set an upper limit for the product of electronic width and branching fractions Γη′(958)→e+e−⋅Bη′(958)→π+π−η⋅Bη→γγ<0.00041 eV at 90% C.L.