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ISSN - 0094243X, AIP Conference Proceedings, 2004, vol. 717, p. 60-64

Experimental study of the e<sup>+</sup>e<sup>-</sup> → π<sup>+</sup>π<sup>-</sup>π<sup>0</sup> reaction by SND detector in the energy range s = 0.42-1.38 GeV

Achasov M. N., Beloborodov K. I., Berdyugin A. V., Bogdanchikov A. G., Bozhenok A. V., Bukin A. D., Bukin D. A., Dimova T. V., Druzhinin V. P., Golubev V. B., Korol A. A., Koshuba S. V., Pakhtusova E. V., Perevedentsev E. A., Pyata E. E., Serednyakov S. I., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Valishev A. A., Vasiljev A. V.

© 2004 American Institute of Physics. The review of the SND results of the e + e - → π + π - π 0 process study in the energy range s = 0.42-1.38 GeV at VEPP-2M collider, based on about 2 × 10 6 selected events, is presented. The total cross section, parameters of the ρ, ω, φ, resonances, and ω′, ω″ states were obtained. It was found that ρπ and ωπ 0 intermediate states describe the reaction dynamics. The experimental data cannot be described by a sum of only ω, φ, ω′ and ω″ resonances contributions. This can be interpreted as a manifestation of the ρ → 3π decay, suppressed by G-parity, with relative probability B(ρ → 3π) = (1.01 ±0.360.54±0.034) × 10-4.