Abstract
A method is presented to unitarize the hard-meson current algebra kaon-pion amplitude derived by Ford. Elastic unitarity is satisfied in the lowest-order correction to current algebra. The amplitude contains̀ three real parameters and does not have any arbitrary function for simulating left-hand discontinuities. Once the isospin-half P-wave is given in the low-energy region, this method leads to a sharp determination of the S-wave phase shifts. Our solution favors the “down” type for the I = 1 2 S-wave phase shifts.
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