KLOE results on light meson spectroscopy and prospects for KLOE-2

Abstract

The results obtained by the KLOE Collaboration on light meson spectroscopy are presented. The radiative decay ϕ → ηγ have been used to study several η decay channels. The Dalitz plot distributions of the η → 3π decays, both in charged and neutral final states have been measured. The box anomaly contribution in η → π+ π−γ has been investigated in, and the rare decays η → π0γγ, η → π+π−e+e− and η → e+e−e+e− have been measured. Also the strategy for the measurement of the transition form factor of ϕ → ηe+e− is described. The radiateve process ϕ → η′γ has been used to study the η′ → ηππ decay channels, obtaining a measurement of the pseudoscalar mixing angle, and finding an evidence for a gluonium content of η′. The decays ϕ → PPγ where P means a pseudoscalar meson, have been exploited to investigate the light scalar mesons, f0(980), a0(980), and σ(600). The couplings of the scalar mesons to KK̄, ππ or ππ0, and to the ϕ resonance have been measured. The prospects for the new KLOE-2 data-taking just started at the upgraded DAΦNE with an upgraded detector are described.