Unitarity corrections to current algebra versus chiral perturbation calculations in kaon-pion scattering

We compare chiral perturbation theory (ChPT) and the unitarization program of current algebra. In this paper, we compare the analytic structure these methods imply for low-energy, kaon-pion scattering and discuss their similarities. We also reproduce in this article a three-parameter fit of experimental kaon-pion {ital S}- and {ital P}-wave phase shifts with a current algebra quasiunitarized amplitude, published long ago, and we make a comparison with the recent results of ChPT. {copyright} {ital 1996 The American Physical Society.}