Study of the process $e^+e^- \to π^+π^-$ in the energy region 400<\sqrt[]{s}<1000 MeV

M. N. Achasov; K. I. Beloborodov; A. V. Berdyugin; A. G. Bogdanchikov; A. V. Bozhenok; A. D. Bukin; D. A. Bukin; T. V. Dimova; V. P. Druzhinin; V. B. Golubev; I. A. Koop; A. A. Korol; S. V. Koshuba; A. P. Lysenko; A. V. Otboev; E. V. Pakhtusova; S. I. Serednyakov; Yu. M. Shatunov; V. A. Sidorov; Z. K. Silagadze; A. N. Skrinsky; Yu. A. Tikhonov; A. V. Vasiljev

doi:10.1134/1.2163921

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Study of the process $e^+e^- \to π^+π^-$ in the energy region 400<\sqrt[]{s}<1000 MeV

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Abstract

The cross section of the process e^+e^-\to π^+π^- was measured in the SND experiment at the VEPP-2M collider in the energy region 400<\sqrt[]{s}<1000 MeV. This measurement was based on about 12.4 \times 10^6 selected collinear events, which include 7.4\times 10^6 e^+e^-\to e^+e^-, 4.5\times 10^6 e^+e^-\toπ^+π^- and 0.5\times 10^6 e^+e^-\toμ^+μ^- selected events. The systematic uncertainty of the cross section determination is 1.3 %. The ρ-meson parameters were determined: m_ρ=774.9\pm 0.4\pm 0.5 MeV, Γ_ρ=146.5\pm 0.8\pm 1.5 MeV, σ(ρ\toπ^+π^-)=1220\pm 7\pm 16 nb as well as the parameters of the G-parity suppressed decay ω\toπ^+π^-: σ(ω\toπ^+π^-)=29.9\pm 1.4\pm 1.0 nb and ϕ_{ρω} = 113.5\pm 1.3\pm 1.7 degree.

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M. N. Achasov, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, A. D. Bukin, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, I. A. Koop, A. A. Korol, S. V. Koshuba, A. P. Lysenko, A. V. Otboev, E. V. Pakhtusova, S. I. Serednyakov, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, Yu. A. Tikhonov, A. V. Vasiljev. 2005-06-30. Study of the process $e^+e^- \to π^+π^-$ in the energy region 400<\sqrt[]{s}<1000 MeV. https://doi.org/10.1134/1.2163921

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