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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2000, vol. 491, p. 81-89

Observation of the φ → π+π-π+π- decay

Akhmetshin R. R., Anashkin E. V., Arpagaus M., Aulchenko V. M., Banzarov V. Sh, Barkov L. M., Bashtovoy N. S., Bondar A. E., Bondarev D. V., Bragin A. V., Chernyak D. V., Eidelman S. I., Fedotovitch G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Hughes V. W., Ignatov F. V., Ivanov P. M., Karpov S. V., Kazanin V. F., Khazin B. I., Koop I. A., Korostelev M. S., Krokovny P. P., Kurdadze L. M., Kuzmin A. S., Logashenko I. B., Lukin P. A., Mikhailov K. Yu, Milstein A. I., Nesterenko I. N., Okhapkin V. S., Otboev A. V., Perevedentsev E. A., Popov A. S., Purlatz T. A., Redin S. I., Root N. I., Ruban A. A., Ryskulov N. M., Shamov A. G., Shatunov Yu M., Shwartz B. A., Sibidanov A. L., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Stepanov P. Yu, Sukhanov A. I., Thompson J. A., Titov V. M., Valishev A. A., Yudin Yu V., Zverev S. G.

Using 11.6 pb-1 of data collected in the energy range 0.984-1.06 GeV by CMD-2 at VEPP-2M, the cross section of the reaction e+e- → π+π-π+π- has been studied. For the first time an interference pattern was observed in the energy dependence of the cross section near the φ meson. The branching ratio of the φ → π+π-π+π- decay double suppressed by the G-parity and OZI rule is measured Br(φ → π+π-π+π-) = (3.93 ± 1.74 ± 2.14) x 10-6. The upper limits have been placed for the decays φ → π+π-π+π-π0 and ηπ+ Br(φ → π+π-π+π-π0) < 4.6 x 10-6 90% CL, Br(φ → ηπ+π-) < 1.8 x 10-5 90% CL. (C) 2000 Published by Elsevier Science B.V.