| Study of the process e+e-→π+π-π0π0 at energies √s< 1 GeV |
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| 作者单位： | M.N.Achasov,K.I.Beloborodov,V.B.Golubev,T.V.Dimova,V.P.Druzhinin,L.V.Kardapoltsev,A.G.Kharlamov,I.A.Koop,A.A.Korol,A.E.Obrazovsky,S.I.Serednyakov,Z.K.Silagadze,Yu.A.Tikhonov,A.V.Vasil'ev(Budker Institute of Nuclear Physics,Russian Academy of Sciences,Siberian Branch,pr.Akademika Lavrent'eva 11,Novosibirsk,630090 Russia;Novosibirsk State University,Novosibirsk,630090 Russia);A.V.Berdyugin,A.A.Botov,D.P.Kovrizhin,S.V.Koshuba,E.V.Pakhtusova,D.A.Shtol,A.N.Skrinsky,Yu.M.Shatunov(Budker Institute of Nuclear Physics,Russian Academy of Sciences,Siberian Branch,pr.Akademika Lavrent'eva 11,Novosibirsk,630090 Russia) |
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| 摘 要： | In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e+e-→π+π-π0π0 was measured. At energies √s < 920 MeV this cross section was measured for the first time. The energy dependence of the cross section is well discribed by the vector dominance
model with contributions from ρ, ρ' ρ", mesons. The decay probability ρ→π+π-π0π0was found to be Bρ = (1.60±0.74±0.18)×10-5. The upper limit for the decay ω→π+π-π0π0 was improved by two orders of magnitude compared to the previous measurements and is Bω < 2 × 10-4 at 90% confidence level.
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