Scalar mesons and delta0-delta2 at KLOE

The KLOE measurements of φ radiative decays and of the ratio Γ ( K S → π + π − ( γ )) / Γ ( K S → π 0 π 0 ) are discussed. The first measurement aims at understanding the real nature of the scalar mesons a 0 and f 0 , whose possible compositions are q ¯ q , qq ¯ q ¯ q , or K ¯ K molecule. The second measurement is related to the estimate of the phase shift di ff erence δ 0 − δ 2 . Previous measurements were a ff ected by a large uncertainty due to the presence of radiative e ff ects which are correctly included in our analysis.