The low-lying Scalar Mesons and Related Topics

Abstract

After presenting the motivations to explore the low-lying scalar mesons such as the $\sigma$, $a_0$ and $\kappa$ in the unquenched as well as quenched lattice QCD, we review the works done by our collaboration (SCALAR Collaboration) with a what-to-do-next list. We briefly mention the imporatance to explore the $N_c$ dependence of and possible effects of the $U_A(1)$ anomaly to the properties the low-lying scalar mesons.

Comments: 4 pages, 2 figures. Invited talk at QCD08, 14th International QCD Conference, 7-12th July, 2008, Montpellier (France)