2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/228417The hypothesis of the existence of a secluded gauge sector with manifestations at low energies can be tested at low and medium energy e+e- colliders, such as DAFNE.Some signatures are very straightforward and can be relatively easily isolated against background. Therefore KLOE, with its 2.5 fb-1 of data, and KLOE-2 with its proposed detector's upgrades and larger data sample are and will be able to test this hypothesis in deep detailTalk given at the KLOE-2 Physics Workshop, Frascati April 9-10 2009High Energy Physics - Experimenttext