Two loops calculation in chiral perturbation theory and the unitarization program of current algebra
J. Sá Borges, J. Soares Barbosa, M. D. Tonasse
Abstract
In this paper we compare two loop Chiral Perturbation Theory (ChPT) calculation of pion-pion scattering with the unitarity second order correction to the current algebra soft-pion theorem. It is shown that both methods lead to the same analytic structure for the scattering amplitude.
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