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We describe the interference between amplitudes $e^ +e^-\to\rho\to\gamma\pi^+\pi^-$ and $e^ + e^-\to\phi\to\gamma (f_0 + \sigma)\to\gamma\pi^ + \pi^-$, with regard to the phase of the elastic $\pi\pi$scattering background and mixing of the $f_0$ and $\sigma$ mesons. It is shownthat the Fermi-Watson theorem for the final state interaction in the reaction$e^ + e^-\to\rho\to\gamma\pi^ + \pi^-$ is not valid in the case of softphotons, $\omega < 100$ MeV, in the $\phi$ meson region. The interferencepatterns in the spectrum of the photon energy differential cross-section and inthe full cross-section as a function of the beam energy are obtained.Comment: 10 pages, revtex, 2 ps files of figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Interference in the reactione+e−→γπ+<…