New measurement of the rare decay ϕ→η′γ\phi \to \eta' \gamma with CMD-2

A new measurement of the rare decay \phi \to \eta' \gamma performed with the CMD-2 detector at Novosibirsk is described. Of the data sample corresponding to the integrated luminosity of 14.5 pb^{-1}, twenty one events have been selected in the mode \eta'\to\pi^+\pi^-\eta, \eta\to\gamma\gamma. The following branching ratio was obtained: B(\phi \to \eta' \gamma) = (8.2^{+2.1}_{-1.9} \pm 1.1) 10^{-5}.Comment: 12 pages, 4 figures, LaTe