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KLOE RESULTS ON LIGHT MESON SPECTROSCOPY

The KLOE experiment has been carried out at the Frascati φ-factory DAΦNE; its data taking ended in March 2006 with a total integrated luminosity of 2.5 fb−1, corresponding to 8 × 109φ(1020) mesons produced. The decays φ(1020) → PPγ, where P means a pseudoscalar meson, are dominated by the exchange of a scalar meson S in the intermediate state (φ→ Sγ, and S → PP ), thus they are suitable processes to study the f0(980) and a0(980), and also to look for a possible signal of the σ(600). It is still controversial whether the light scalars are ordinary qq̄ mesons, compact qqq̄q̄ states, or bound states of a K and a K̄ mesons. The measurement of the branching ratios of φ(1020) → PPγ and of the parameters of the scalar resonances (masses and couplings) are sensitive to their internal structure. On the other hand large samples of η and η′ mesons are produced, through