Abstract

The dispersion relation for the 3-3-amplitude given byChew, Goldberger, Low andNambu cannot be tested presently because of the experimental uncertainties of the scattering phase, but it discriminates between several interpolations of the experimental data. The only conclusion which can be drawn from the discrepancy found byTsuchida andKakazawa is that the Breit-Wigner formula is not suitable. We have shown that the experimental values are consistent with the dispersion relation if an effective range formula is used up to 120 MeV. The result for the coupling constantf2=0.097 is somewhat higher than the value used in the effective range formula, but the difference is probably not larger than the terms which are neglected in the derivation of the dispersion relation.

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