Chinese Physics C > 2010, Vol. 34 > Issue(6): 680-685 DOI: 10.1088/1674-1137/34/6/012

Study of the process e⁺e^－→π⁺π^－π⁰π⁰at energies √s<1 GeV

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In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e⁺e^－→π⁺π^－π⁰π⁰was 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 B_ρ=(1.60±0.74±0.18)×10^－5. The upper limit for the decay ω→π⁺π^－π⁰π⁰was improved by two orders of magnitude compared to the previous measurements and is B_ω<2×10^－4at 90% confidence level.

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K. I. Beloborodov, A. V. Berdyugin, A. A. Botov, V. B. Golubev, T. V. Dimova, V. P. Druzhinin, 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 and A. V. Vasil'ev. Study of the process e ⁺e ^－→π ⁺π ^－π ⁰π ⁰at energies √s<1 GeV[J]. Chinese Physics C, 2010, 34(6): 680-685. doi: 10.1088/1674-1137/34/6/012

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Received: 2010-01-25
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Study of the process e⁺e^－→π⁺π^－π⁰π⁰at energies √s<1 GeV

Corresponding author:A. G. Kharlamov,

Received Date:2010-01-25
Accepted Date:1900-01-01
Available Online:2010-06-05

Abstract:

In an experiment with the Spherical Neutral Detector at VEPP-2M collider the cross section of the process e⁺e^－→π⁺π^－π⁰π⁰was 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 B_ρ=(1.60±0.74±0.18)×10^－5. The upper limit for the decay ω→π⁺π^－π⁰π⁰was improved by two orders of magnitude compared to the previous measurements and is B_ω<2×10^－4at 90% confidence level.