The interference in the reaction $e^{+}{e}^{-}\to \gamma {\pi }^{+}{\pi }^{-}$ and the search for the decay $\varphi \to \gamma f_0\to \gamma {\pi }^{+}{\pi }^{-}$

N. N. Achasov, V. V. Gubin, E. P. Solodov

We describe the interference between amplitudes $e^{+}{e}^{-}\to \rho \to \gamma {\pi }^{+}{\pi }^{-}$ and $e^{+}{e}^{-}\to \varphi \to \gamma f_0\to \gamma {\pi }^{+}{\pi }^{-}$, where $f_0$ meson is considered in the frameworks of the four-quar…