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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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arxiv hep-ex/0506076 v1 pith:JC2SG6DY submitted 2005-06-30 hep-ex

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
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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
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The cross section of the process e^+e^-\to \pi^+\pi^- 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^-\to\pi^+\pi^- and 0.5\times 10^6 e^+e^-\to\mu^+\mu^- selected events. The systematic uncertainty of the cross section determination is 1.3 %. The \rho-meson parameters were determined: m_\rho=774.9\pm 0.4\pm 0.5 MeV, \Gamma_\rho=146.5\pm 0.8\pm 1.5 MeV, \sigma(\rho\to\pi^+\pi^-)=1220\pm 7\pm 16 nb as well as the parameters of the G-parity suppressed decay \omega\to\pi^+\pi^-: \sigma(\omega\to\pi^+\pi^-)=29.9\pm 1.4\pm 1.0 nb and \phi_{\rho\omega} = 113.5\pm 1.3\pm 1.7 degree.

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