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arXiv · 1010.4878

Measurement of $\phi$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider

R. R. Akhmetshin·V. M. Aulchenko·V. Sh. Banzarov·L. M. Barkov·S. E. Baru·N. S. Bashtovoy·A. E. Bondar·A. V. Bragin·S. I. Eidelman·D. A. Epifanov·G. V. Fedotovich·N. I. Gabyshev·A. A. Grebenuk·D. N. Grigoriev·F. V. Ignatov·S. V. Karpov·V. F. Kazanin·B. I. Khazin·I. A. Koop·P. P. Krokovny·A. S. Kuzmin·I. B. Logashenko·P. A. Lukin·A. P. Lysenko·K. Yu. Mikhailov·V. S. Okhapkin·E. A. Perevedentsev·A. S. Popov·S. I. Redin·A. A. Ruban·N. M. Ryskulov·Yu. M. Shatunov·B. A. Shwartz·A. L. Sibidanov·I. G. Snopkov·E. P. Solodov·Yu. V. Yudin
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Abstract

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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R. R. Akhmetshin, V. M. Aulchenko, V. Sh. Banzarov, L. M. Barkov, S. E. Baru, N. S. Bashtovoy, A. E. Bondar, A. V. Bragin, S. I. Eidelman, D. A. Epifanov, G. V. Fedotovich, N. I. Gabyshev, A. A. Grebenuk, D. N. Grigoriev, F. V. Ignatov, S. V. Karpov, V. F. Kazanin, B. I. Khazin, I. A. Koop, P. P. Krokovny, A. S. Kuzmin, I. B. Logashenko, P. A. Lukin, A. P. Lysenko, K. Yu. Mikhailov, V. S. Okhapkin, E. A. Perevedentsev, A. S. Popov, S. I. Redin, A. A. Ruban, N. M. Ryskulov, Yu. M. Shatunov, B. A. Shwartz, A. L. Sibidanov, I. G. Snopkov, E. P. Solodov, Yu. V. Yudin. 2010-10-23. Measurement of $\phi$(1020) meson leptonic width with CMD-2 detector at VEPP-2M Collider. https://doi.org/10.1016/j.physletb.2010.11.050

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