Study of the process $e^+e^- \to \pi^+\pi^-$ in the energy region 400<\sqrt[]{s}<1000 MeV
M. N. Achasov,Konstantin Beloborodov,A. V. Berdyugin,Alexander Bogdanchikov,A. V. Bozhenok,A. D. Bukin,D.A. Bukin,T. V. Dimova,V. P. Druzhinin,V. B. Golubev,Ivan Koop,A. A. Korol,S. V. Koshuba,A. P. Lysenko,A. V. Otboev,E. V. Pakhtusova,S. I. Serednyakov,Vladimir A. Sidorov,Z. K. Silagadze,A.N. Skrinsky,A. V. Vasiljev +20 more
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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 as discussed by the authors.Abstract:
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.read more
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