Low Mass Scalar Mesons and Related Topics

Abstract

We give a brief survey on the physical significance of the low-mass scalar mesons in QCD, and also report on recent lattice studies on the sigma and kappa mesons. The importance to explore the in-medium properties of the hadrons is mentioned.Comment: talk presented at Yukawa International Seminar(YKIS) 2006 "New Frontiers in QCD -- Exotic Hadrons and Hadronic Matter --", November 20 to December 8, 2006, at Yukawa Institute for Theoretical Physics, Kyoto University. 4 pages.tobe published in the proceedings(Supplemet of Prog. Theor. Phys.