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[en] We estimate the relative branching ratio of σ to 2π for the decay of the Ψ'(2S), which we have found to be a mixed charm and hybrid charmonium meson. The external field method and correlators from a previous calculation are used to estimate these decays. We find the σ to 2π branching ratio for Ψ'(2S) to the J/Ψ(1S) decay to be 0.98, in agreement with an experiment at IHEP-BES.
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