A two-particle approximation is suggested for the 3π→3π amplitude: The amplitude is replaced by a ρ+π→ρ+π amplitude multiplied by 2π resonance factors. An approximate calculation of the J=1-, $T=0$ partial wave for the ρ-π amplitude is made, including only the "elastic" and one-pion-exchange cuts, but it seems to give no hint of a 3π resonance.
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David R. Harrington (1962) studied this question.
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