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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2004, vol. 580, p. 119-128

Study of the process e+e- → π 0π0γ in c.m. energy range 600-970 MeV at CMD-2

Akhmetshin R. R., Aulchenko V. M., Banzarov V. Sh, Baratt A., Barkov L. M., Baru S. E., 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., 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., Stepanov P. Yu, Thompson J. A., Valishev A. A., Yudin Yu V., Zaitsev A. S., Zverev S. G.

The cross section of the process e+e- → π0π0γ has been measured in the c.m. energy range 600-970 MeV with the CMD-2 detector. The following branching ratios have been determined: B(ρ0 → π0π 0γ)=(5.2+1.5 -1.3±0.6) ×10-5 and B(ω → π0π 0γ)=(6.4+2.4 -2.0±0.8) ×10-5. Evidence for the ρ0 → f 0(600)γ decay has been obtained: B(ρ0 → f0(600)γ)=(6.0+3.3 -2.7±0.9) ×10-5. From a search for the process e+e - → ηπ0γ the following upper limit has been obtained: B(ω → ηπ0γ)<3. 3×10-5 at 90% CL. © 2003 Published by Elsevier B.V.