| Autor: |
Alexander Valishev, I.G. Snopkov, N.I. Root, P.Yu. Stepanov, P.M. Ivanov, A.V. Bragin, V.Sh. Banzarov, Yu. M. Shatunov, N.M. Ryskulov, E. P. Solodov, Yu.V. Yudin, A.I. Sukhanov, B.I. Khazin, E.A. Perevedentsev, R.R. Akhmetshin, D.N. Grigoriev, Vassili Kazanin, S.V. Karpov, D.V. Chernyak, L.M. Barkov, A.L. Sibidanov, M. Arpagaus, F.V. Ignatov, V.P. Smakhtin, N.S. Bashtovoy, J. A. Thompson, A.V. Otboev, A.S. Popov, A.S. Kuzmin, I.B. Logashenko, G.V. Fedotovitch, V.S. Okhapkin, E.V Anashkin, V. W. Hughes, B.A. Shwartz, K.Yu. Mikhailov, M. S. Korostelev, A.A Ruban, A.N. Skrinsky, S.I. Eidelman, P.A. Lukin, P. Krokovny, A.E. Bondar, S.G. Zverev, Igor Nesterenko, V.A. Sidorov, T.A. Purlatz, L.M. Kurdadze, N. Gabyshev, I. A. Koop, S.I. Redin, A. I. Milstein, V.M. Titov, D.V. Bondarev, V.M. Aulchenko, A.A. Grebeniuk, A.G. Shamov |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
Physics Letters B. 491:81-89 |
| ISSN: |
0370-2693 |
| Popis: |
Using 11.6 pb −1 of data collected in the energy range 0.984–1.06GeV by CMD-2 at VEPP-2M, the cross section of the reaction e + e − →π + π − π + π − hasbeen studied. For the firsttime an interference patternwas observed in the energy dependence of the cross section near theφ meson. The branching ratio of the φ → π + π − π + π − decay doublesuppressed by the G-parity and OZI rule is measuredBr(φ → π + π − π + π − ) = (3.93 ±1.74 ±2.14) ·10 −6 .The upper limits have been placed for the decays φ → π + π − π + π − π 0 and φ → ηπ + π − Br(φ → π + π − π + π − π 0 ) < 4.6 ·10 −6 90%CL,Br(φ → ηπ + π − ) < 1.8 ·10 −5 90%CL. 1 Introduction Production of four pions in e + e − annihilation is now well studied in the c.m.energy range 1.05 to 2.5 GeV (see [ 1] and references therein). Results onthe measurements of the cross section of the reaction e + e − → π + π − π + π − in the energy range from 0.60 to 0.97 GeV as well as the probability of theρ 0 meson decay into the π + π − π + π − |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect