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ISSN - 16741137, Chinese Physics C, 2010, vol. 34, p. 680-685

Study of the process e+e- → π+π -π0π0 at energies √s < 1 GeV

Achasov M. N., Beloborodov K. I., Berdyugin A. V., Botov A. A., Golubev V. B., Dimova T. V., Druzhinin V. P., Kardapoltsev L. V., Kharlamov A. G., Kovrizhin D. P., Koop I. A., Korol A. A., Koshuba S. V., Obrazovsky A. E., Pakhtusova E. V., Shtol D. A., Serednyakov S. I., Silagadze Z. K., Skrinsky A. N., Tikhonov Yu A., Shatunov Yu M., Vasil'Ev A. V.

In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e+e- → π+π-π0π0 was measured. At energies √s < 920 MeV this cross section was measured for the first time. The energy dependence of the cross section is well discribed by the vector dominance model with contributions from ρ, ρ′, ρ′′ mesons. The decay probability ρ → π +π-π0π0 was found to be Bρ = (1.60±0.74±0.18) × 10-5. The upper limit for the decay ω → π+π -π0π0 was improved by two orders of magnitude compared to the previous measurements and is Bω < 2 × 10-4 at 90% confidence level. © 2010 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.