2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225070Two-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.Talk given at the XII International Conference on Hadron Spectroscpy, (Hadron 07), Frascati (Rome), 8-13 October 2007High Energy Physics - Phenomenologytext