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Study of the process e^+e^- →π^+π^-π~0π~0 at energies s~(1/2)<1 GeV
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作者 M.N.Achasov K.I.Beloborodov +19 位作者 A.V.Berdyugin A.A.Botov V.B.Golubev T.V.Dimova V.P.Druzhinin L.V.Kardapoltsev A.G.Kharlamov D.P.Kovrizhin I.A.Koop A.A.Korol S.V.Koshuba A.E.Obrazovsky E.V.Pakhtusova D.A.Shtol S.I.Serednyakov Z.K.Silagadze A.N.Skrinsky Yu.A.Tikhonov Yu.M.Shatunov A.V.Vasil'ev 《Chinese Physics C》 SCIE CAS CSCD 2010年第6期680-685,共6页
In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e^+e^- →π^+π^-π^0π^0 was measured. At energies √s 〈 920 MeV this cross section was measured for the fi... In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e^+e^- →π^+π^-π^0π^0 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 p, p', p" mesons. The decay probability ρ→π^+π^-π^0π^0 was found to be Bρ = (1.60±0.74±0.18) × 10^-5. The upper limit for the decay ω→π^+π^-π^0π^0 was improved by two orders of magnitude compared to the previous measurements and is Bω 〈 2 × 10^-4 at 90% confidence level. 展开更多
关键词 VEPP-2M spherical neutral detector meson decay
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