Light scalars as tetraquarks: decays and mixing with quarkonia

Abstract

The tetraquark assignement for light scalar states below 1 GeV is discussed on the light of strong decays. The next-to-leading order in the large-N expansion for the strong decays is considered. Mixing with quarkonia states above 1 GeV is investigated within a chiral approach and the inclusion of finite-width effects is taken into account.

Comments: Talk given at the International School of Nuclear Physics, 29th Course, 'Quarks in Hadrons and Nuclei', Erice-Sicily, 16-24 September 2007. To appear in Prog. Part. Nucl. Phys. 10 pages, 1 figure