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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2002, vol. 66, p. -

Study of the process e+e- → π+π -π0 in the energy region √s from 0.98 to 1.38 GeV

Achasov M. N., Aulchenko V. M., Beloborodov K. I., Berdyugin A. V., Bogdanchikov A. G., Bozhenok A. V., Bukin A. D., Bukin D. A., Burdin S. V., Dimova T. V., Druzhinini V. P., Golubev V. B., Ivanchenko V. N., Korol A. A., Koshuba S. V., Nesterenko I. N., Pakhtusova E. V., Polunin A. A., Salnikov A. A., Serednyakov S. I., Shary V. V., Shatunov Yu M., Sidorov V. A., Silagadze Z. K., Skrinsky A. N., Skripkin A. G., Usov Yu V., Vasiljev A. V.

The cross section of the process e+e- → π+π-π0 was measured in the Spherical Neutral Detector experiment at the VEPP-2M collider in the energy region √s = 980-1380 MeV. The measured cross section, together with the e +e- → π+π -π0 and ωπ+π- cross sections obtained in other experiments, was analyzed in the framework of the generalized vector meson dominance model. It was found that the experimental data can be described by a sum of ω, φ mesons and two ω′ and ω″ resonances contributions, with masses m ∼ 1490, m ω″ ∼ 1790 MeV and widths Γ ω′ ∼ 1210, Γω′ ∼ 560 MeV. The analysis of the π+π- invariant mass spectra in the energy region √s from 1100 to 1380 MeV has shown that for their description one should take into account the e+e- → ωπ0 →π+π -π0 mechanism also. The phase between the amplitudes corresponding to the e+e- → ωπ and e +e- → ρπ intermediate states was measured for the first time. The value of the phase is close to zero and depends on energy. © 2002 The American Physical Society.