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  • Measurement of $\phi$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider
    Akhmetshin, R. R; Aulchenko, V. M; Banzarov, V. Sh; Barkov, L. M; Baru, S. E; Bashtovoy, N. S; Bondar, A. E; Bragin, A. V; Eidelman, S. I; Epifanov, D. A; Fedotovich, G. V; Gabyshev, N. I; Grebenuk, A. A; Grigoriev, D. N; Ignatov, F. V; Karpov, S. V; Kazanin, V. F; Khazin, B. I; Koop, I. A; Krokovny, P. P; Kuzmin, A. S; Logashenko, I. B; Lukin, P. A; Lysenko, A. P; Mikhailov, K. Yu; Okhapkin, V. S; Perevedentsev, E. A; Popov, A. S; Redin, S. I; Ruban, A. A; Ryskulov, N. M; Shatunov, Yu. M; Shwartz, B. A; Sibidanov, A. L; Snopkov, I. G; Solodov, E. P; Yudin, Yu. V

    10/2010
    Journal Article

    Phys.Lett.B695:412-418,2011 The $\phi$(1020) meson leptonic width has been determined from the combined analysis of 4 major decay modes of the resonance ($\phi\to K^+ K^-,K^0_LK^0_S,\pi^+\pi^-\pi^0,\eta\gamma$) studied with the CMD-2 detector at the VEPP-2M $e^+e^-$ collider. The following value has been obtained: $\Gamma(\phi\to e^+e^-) = 1.235\pm 0.006\pm 0.022$ keV. The $\phi(1020)$ meson parameters in four main decay channels have been also recalculated: $B(\phi\to K^+K^-) = 0.493\pm 0.003\pm 0.007$, $B(\phi\to K_LK_S) = 0.336\pm 0.002\pm 0.006$, $B(\phi\to\pi^+\pi^-\pi^0) = 0.155\pm 0.002\pm 0.005$, $B(\phi\to\eta\gamma) = 0.0138\pm 0.0002\pm 0.0002$.

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