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The decay η′ → ηπ0π0 is studied in the framework of isobar model. It is shown, that good agreement with the experiment is achieved if α0- and σ-meson contributions are taken into account. The contribution of α0-meson is dominant, but σ-meson is necessary to reproduce the form of the Dalitz plot. Instead of the usual Breit-Wigner form of σ-meson propagator we use parametrization of the ππ-amplitude,...
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