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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2003, vol. 68, p. -

Study of the process e+e- → π+π -π0 in the energy region √s below 0.98 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., Koop I. A., Korol A. A., Koshuba S. V., Lysenko A. P., Pakhtusova E. V., Serednyakov S. I., Shary V. V., Shatunov Yu M., Silagadze Z. K., Skrinsky A. N., Valishev A. A., Vasiljev A. V.

The cross section of the process e+e- →π+π-π0 was measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2M collider in the energy region √s below 980 MeV. This measurement was based on about 1.2×106 selected events. The obtained cross section was analyzed together with the SND and DM2 data in the energy region √s up to 2 GeV. The co-meson parameters mω=782.79±0.08±0. 09 MeV, Γω=8.68 ±0.04±0.15 MeV, and σ(ω→3π)= 1615±9±57 nb were obtained. It was found that the experimental data cannot be described by a sum of only ω, φ, ω′, and ω″ resonance contributions. This can be interpreted as a manifestation of ρ→3π decay, suppressed by G parity, with a relative probability B(ρ→3π) = (1.01 -0.36+0.54 ± 0.034)′10-4. © 2003 The American Physical Society.