Low Lying Scalar Resonances and Chiral Symmetry

Abstract

Current theoretical studies on the $\sigma$ and $\kappa$ resonances are reviewed. It is emphasized that all evidences accumulated so far are consistent with the picture that the $\sigma$ meson is the chiral partner of the Nambu--Goldstone bosons in a linear realization of chiral symmetry.

Comments: Invited plenary talk given at CHIRAL 2007, Nov. 13-16, 2007, RCNP, Osaka, Japan