Tetra-quark Systems in Heavy Mesons -- D_{s0}^+(2317), X(3872) and related --

Abstract

Typical candidates of open- and hidden-charm tetra-quark mesons are studied through their decays and productions, and are compared with conventional mesons. In addition, it is proposed how to confirm experimentally that they are tetra-quark mesons.

Comments: 5 pages, 0 figure, invited talk at the workshop on New Frontier of QCD 2010 (NFQCD 2010), Jan. 18 -- Mar. 19, 2010, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto, Japan, typos corrected