Study of conversion decays φ→ηe+e−, η→e+e−γ and η→π+π−e+e− at CMD-2

Autor: Alexander Valishev, M. Arpagaus, A.S. Kuzmin, V.A. Sidorov, N.I. Root, Igor Nesterenko, L.M. Kurdadze, M. Lechner, A.V. Otboev, A.A. Grebeniuk, P.Yu. Stepanov, B.A. Shwartz, V.M. Aulchenko, V.S. Okhapkin, A.G. Shamov, R.R. Akhmetshin, A.V. Bragin, A.S. Popov, V.Sh. Banzarov, V. W. Hughes, V.M. Titov, S.I. Eidelman, P.M. Ivanov, J. A. Thompson, S.G. Zverev, E. P. Solodov, K.Yu. Mikhailov, G.V. Fedotovitch, A.N. Skrinsky, Yu. M. Shatunov, N.M. Ryskulov, S.V. Karpov, Vassili Kazanin, Ivan Koop, A.L. Sibidanov, N.S. Bashtovoy, I.B. Logashenko, I.G. Snopkov, D.V. Bondarev, D.V. Chernyak, P.A. Lukin, A.I. Sukhanov, D.N. Grigoriev, P. Krokovny, A.A. Ruban, V.P. Smakhtin, Yu.V. Yudin, E.A. Perevedentsev, L.M. Barkov, E.V. Anashkin, T.A. Purlatz, F.V. Ignatov, N. Gabyshev, A.E. Bondar, B.I. Khazin
Rok vydání: 2001
Předmět:
Zdroj: Physics Letters B. 501:191-199
ISSN: 0370-2693
Popis: Using 15.1 pb −1 of data collected by CMD-2 in the φ -meson energy range, the branching ratios of the following conversion decays have been measured: B ( φ → ηe + e − )=(1.14±0.10±0.06)×10 −4 , B ( η → e + e − γ )=(7.10±0.64±0.46)×10 −3 , B ( η → π + π − e + e − )=(3.7 +2.5 −1.8 ±0.3)×10 −4 . The upper limits for the following rare conversion decays have been obtained at the 90% confidence level: B ( φ → ημ + μ − ) −6 , B ( η → e + e − e + e − ) −5 .
Databáze: OpenAIRE
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