Two-photon decay of light scalars: a comparison of tetraquark and quarkonium assignments

Abstract

Two-photon decays of light scalar mesons are discussed within the quarkonium and tetraquark asignements: in both cases the decay rate of the sigma resonances turns out to be smaller than 1 keV.

Comments: Talk given at the XII International Conference on Hadron Spectroscpy, (Hadron 07), Frascati (Rome), 8-13 October 2007