1. First observation of the decay φ→η′(958)γ
- Author
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E.V Popkov, E.V Anashkin, B.I. Khazin, P.Yu. Stepanov, D.H Brown, M.A Shubin, V.V Danilov, Yu. M. Shatunov, N.M. Ryskulov, V.P. Smakhtin, A.I. Sukhanov, A.I. Shekhtman, A.P. Lysenko, V.I Ptitzyn, S.I. Eidelman, B.A. Shwartz, M. Arpagaus, T.A. Purlatz, A.A. Grebeniuk, A. V. Klimenkov, P.M. Ivanov, S.G. Zverev, N.I. Root, A.A. Polunin, G.V. Fedotovich, A.G. Shamov, V. W. Hughes, A.A. Ruban, S.E Baru, E. P. Solodov, D.N. Grigoriev, I.B. Logashenko, J. A. Thompson, P.A. Lukin, E.A. Perevedentsev, A.S. Kuzmin, A.G. Chertovskikh, A. Bondar, L.M. Barkov, Yu.V. Yudin, R.R. Akhmetshin, V.A. Sidorov, Vassili Kazanin, V. S. Banzarov, D.V. Chernyak, V.M Aulchenko, Alexander Skrinsky, I. A. Koop, A.V Maksimov, V.S. Okhapkin, B.L. Roberts, N. Gabyshev, L.M. Kurdadze, I.G. Snopkov, and A.S. Dvoretsky
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,law ,Branching fraction ,Radiative decay ,Collider ,Event (particle physics) ,law.invention - Abstract
The decay φ → η ′ γ has been observed by the CMD-2 detector at the e + e − collider VEPP-2M at Novosibirsk. Of 5.5 million produced φ 's, six events of the φ → η ′ γ decay were selected with the expected background less than one event. The corresponding branching ratio is B( φ → η ′ γ )=1.2 +0.7 −0.5 ·10 −4 . It is the first observation of this radiative decay.
- Published
- 1997
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