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We show that the Veneziano-Lovelace one-term formula for pion-pion scattering, although a good first approximation, has some undesirable features. With the help of a few secondary terms, a model amplitude, which is consistent with the known properties of the pion-pion system up to the f⁰ mass region and the high-energy phenomenology, is constructed.
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Kashyap V. Vasavada (1970) studied this question.
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