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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2005, vol. 613, p. 29-38

Study of the ρ and ω meson decays into a pseudoscalar meson and e+e- pair with the CMD-2 detector

Akhmetshin R. R., Aulchenko V. M., Banzarov V. Sh, Baratt A., Barkov L. M., Bashtovoy N. S., Bondar A. E., Bondarev D. V., Bragin A. V., Eidelman S. I., Epifanov D. A., Fedotovitch G. V., Gabyshev N. I., Gorbachev D. A., Grebeniuk A. A., Grigoriev D. N., Ignatov F. V., Karpov S. V., Kazanin V. F., Khazin B. I., Koop I. A., Krokovny P. P., Kuzmin A. S., Logashenko I. B., Lukin P. A., Lysenko A. P., Mikhailov K. Yu, Milstein A. I., Nesterenko I. N., Nikulin M. A., Okhapkin V. S., Otboev A. V., Perevedentsev E. A., Polunin A. A., Popov A. S., 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., Snopkov I. G., Solodov E. P., Thompson J. A., Valishev A. A., Yudin Yu V., Zaitsev A. S., Zverev S. G.

Using 3.3 pb-1 of data collected with the CMD-2 detector in the 720-840 MeV c.m. energy range, the branching fraction of the conversion decay ω→π0e+e- has been measured: B(ω→π0e+e-)=(8.19±0. 71±0.62)×10-4. The upper limits for the branching fractions of the following conversion decays have been obtained at the 90% confidence level: B(ρ→π0e+e -)<1.6×10-5, B(ρ→ηe +e-)<0.7×10-5 and B(ω→η e+e-)<1.1×10-5. © 2005 Elsevier B.V. All rights reserved.