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[en] An analysis has been made of all available data near threshold for the reactions πN→ππN in terms of isospin amplitudes. The experiments for different channels are found to be consistent with each other and with the chiral-symmetry-breaking model of Olsson and Turner. The analysis yields values for the ππ scattering lengths which are in good agreement with a calculation based on the Weinberg ππ interaction corrected for the effects of the f0(975) scalar meson
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