Study of the process e+e−→ηγ in c.m. energy range 600–1380 MeV at CMD-2

R.R. Akhmetshin,E.V. Anashkin,V.M. Aulchenko, V.Sh. Banzarov, A. Baratt,L.M. Barkov,S.E. Baru,N.S. Bashtovoy,A.E. Bondar,D.V. Bondarev,A.V. Bragin,D.V. Chernyak,S.I. Eidelman, G.V. Fedotovitch,N.I. Gabyshev,A.A. Grebeniuk,D.N. Grigoriev,V.W. Hughes,F.V. Ignatov,S.V. Karpov

Physics Letters B（2001）

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摘要

The cross section of the process e+e−→ηγ has been measured in the 600–1380 MeV c.m. energy range with the CMD-2 detector. The following branching ratios have been determined: B(ρ→ηγ)=(3.28±0.37±0.23)×10−4, B(ω→ηγ)=(5.10±0.72±0.34)×10−4, B(φ→ηγ)=(1.287±0.013±0.063)×10−2. Evidence for the ρ(1450)→ηγ decay has been obtained for the first time.

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