Abstract
The KLOE experiment at the Frascati ϕ -factory collected large samples of light mesons, providing precise knowledge of their decay dynamics. The η → π + π − γ decay has been studied to search for a possible contribution from chiral anomaly, while a new preliminary high statistics Dalitz plot analysis of the η → π + π − π 0 will increase the accuracy of the light quark mass ratio. Pseudoscalar production associated to internal conversion of the photon into a lepton pair allows the measurement of the form factor F p ( q 1 2 = M ϕ 2 , q 2 2 > 0) in the kinematical region of interest for the VMD model. Detailed study of such decays has been performed both for ϕ → η e + e − and ϕ → π 0 e + e − processes. Moreover, data collected at √s have been used to study hadron production in γγ interactions, providing the most precise measurement of the Γ( η → γγ ) partial width.
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