KLOE results on light meson properties

We present KLOE results on hadronic physics. We show results on the φ → a0(980)γ decay, with a0 → ηπ0, which provides the a0(980) couplings to ηπ and K+K− and we discuss their relation with the a0 structure; we also show the final measurement for the search of the φ → K0K ̄0γ decay, which proceeds through f0(980)/a0(980) γ. Results for the upper limit on the branching ratio are presented with the full KLOE statistics, which allow to test most of the available theoretical models. Here we update our measurement of the gluonium content of the η′ that indicated a 3 σ’s evidence. Other SU(3) relations were added in the fit, further allowing the extraction of other parameters, such as the vector mixing angle and the SU(3) breaking parameter. Finally we show final results for the BR of the η → π+π−e+e− decay, for the CP violating asymmetry in the angular distribution between the π+π− and the e+e− decay planes in the η rest frame, whose observation could test unexpected mechanism of CP violation, thus providing an hint of new physics beyond the Standard Model. The upper limit on the strength of the new interaction is also evaluated.