Study of the processe+e−→π+π−π0in the energy regionsfrom 0.98 to 1.38 GeV

M. N. Achasov, V. M. Aulchenko, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, S. V. Burdin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev (+16 others)
2002 Physical Review D, Particles and fields  
The cross section of the process e^+e^-→π^+π^-π^0 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^-π^0 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
more » ... with masses m_ω^'∼ 1490,m_ω^"∼ 1790 MeV and widths Γ_ω^'∼ 1210, Γ_ω^"∼ 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 descriptionone should take into account the e^+e^-→ωπ^0→π^+π^-π^0 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.
doi:10.1103/physrevd.66.032001 fatcat:64nni7osbzd3bohfllulgx4sze