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

Abstract

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

14 pages, 3 figures