The Present Status on sigma and kappa Meson Properties

Abstract

The recent experimental data of both pipi / Kpi scattering and production processes, suggesting the existence of scalar sigma and kappa mesons, are reviewed. In many pipi /Kpi production processes the direct effects of their productions are observed, while they are, because of chiral symmetry, hidden in scattering processes, and now sigma(500--600) and kappa(800--900) are considered to be confirmed experimentally. The recent criticism on our method of analyses, which is based on the long believed prejudice of universal pipi / Kpi phase through scattering and production amplitudes, is explained not to be valid.

draft of the proceedings of "Chiral' 02" in Kyoto, Oct 2002

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• The pi -> pi pi process in nuclei and the restoration of chiral symmetry
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• A Calculation of the Physical Mass of Sigma Meson
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