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ZhETF, Vol. 128, No. 6, p. 1201 (December 2005)
(English translation - JETP, Vol. 101, No. 6, p. 1053, December 2005 available online at www.springer.com )

STUDY OF THE PROCESS e⁺e^- \to \pi⁺\pi^- IN THE ENERGY REGION 400<\sqrt{s}<1000 MeV
Achasov M.N., Beloborodov K.I., Berdyugin A.V., Bogdanchikov A.G., Bozhenok A.V., Bukin A.D., Bukin D.A., Dimova T.V., Druzhinin V.P., Golubev V.B., Koop I.A., Korol A.A., Koshuba S.V., Lysenko A.P., Otboev A.V., Pakhtusova E.V., Serednyakov S.I., Shatunov Yu.M., Sidorov V.A., Silagadze Z.K., Skrinsky A.N., Tikhonov Yu.A., Vasiljev A.V.

Received: June 24, 2005

PACS: 13.66.Bc, 13.66.Jn, 13.25.Jx, 12.40.Vv

DJVU (282.1K) PDF (855.4K)

The cross section of the process $e^+e^-\to \pi^+\pi^-$ was measured in the spherical neutral detector experiment at the VEPP-2M collider in the energy region $400<\sqrt{s}<1000$ MeV. This measurement was based on about 12.4 • 10⁶ selected collinear events, which include 7.4• 10⁶ $e^+e^-\to e^+e^-$ , 4.5• 10⁶ $e^+e^-\to\pi^+\pi^-$ , and 0.5• 10⁶ $e^+e^-\to\mu^+\mu^-$ selected events. The systematic uncertainty of the cross section determination is 1.3 %. The ρ-meson parameters were determined as $m_\rho=774.9\pm 0.4\pm 0.5$ MeV, $\Gamma_\rho=146.5\pm 0.8\pm 1.5$ MeV, and $\sigma(\rho\to\pi^+\pi^-)=1220\pm 7\pm 16$ nb and the parameters of the G-parity suppressed decay $\omega\to\pi^+\pi^-$ as $\sigma(\omega\to\pi^+\pi^-)=29.9\pm 1.4\pm 1.0$ nb and $\phi_{\rho\omega} = 113.5\pm 1.3\pm 1.7$ degree.

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