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
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.