| Autor: |
A.A. Polunin, A.V. Bragin, Igor Nesterenko, Alexander Valishev, S.V. Karpov, A.I. Sukhanov, A.E. Bondar, A. I. Milstein, E. P. Solodov, S.I. Eidelman, A.A. Grebeniuk, M. Arpagaus, N.M. Ryskulov, V.Sh. Banzarov, E.V. Anashkin, A.G. Shamov, A.L. Sibidanov, I.G. Snopkov, A.N. Skrinsky, A.S. Kuzmin, J. A. Thompson, M. S. Korostelev, I.B. Logashenko, Vassili Kazanin, V.A. Sidorov, R.R. Akhmetshin, B.A. Shwartz, V.M. Aulchenko, G.V. Fedotovitch, B.I. Khazin, V.M. Titov, S.G. Zverev, P.Yu. Stepanov, L.M. Kurdadze, N.I. Root, D.V. Bondarev, A.V. Otboev, P.A. Lukin, D.V. Chernyak, V.S. Okhapkin, T.A. Purlatz, N.S. Bashtovoy, N. Gabyshev, V. W. Hughes, Yu. M. Shatunov, Ivan Koop, A.S. Popov, K.Yu. Mikhailov, Yu.V. Yudin, L.M. Barkov, A.A. Ruban, P. Krokovny, V.P. Smakhtin, D.N. Grigoriev |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
Physics Letters B. 475:190-197 |
| ISSN: |
0370-2693 |
| Popis: |
Using 3.07 pb −1 of data collected in the energy range 0.60–0.97 GeV by CMD-2, about 150 events of the process e + e − → π + π − π + π − have been selected. The energy dependence of the cross section agrees with the assumption of the a 1 (1260) π intermediate state which is dominant above 1 GeV. For the first time π + π − π + π − events are observed at the ρ meson energy. Under the assumption that all these events come from the ρ meson decay, the value of the cross section at the ρ meson peak corresponds to the following decay width: Γ(ρ 0 →π + π − π + π − )=(2.8±1.4±0.5) keV or to the branching ratio B(ρ 0 →π + π − π + π − )=(1.8±0.9±0.3)·10 −5 . |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect