Measurement of φ(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

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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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classification ✦ hep-ex

keywords beengammamesoncmd-2colliderdecaydetectorleptonic

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

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