Study of the radiative decay $\varphi \to \eta \gamma$ with CMD-2 detector

CMD2 Collaboration

Using the $1.9p{b}^{-1}$ of data collected with the CMD-2 detector at VEPP-2M the decay mode $\varphi \to \eta \gamma$, $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ has been studied. The obtained branching ratio is B($ϕ\to ηγ…