Hadronic cross section measurements and contribution to $(g-2{)}_{\mu }$ with KLOE

The KLOE experiment at the DA$\mathrm{\Phi }$NE $\varphi$-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events. Results based on an integrated luminosity of 240 pb${}^{-1}$ and extraction of the $\pi \pi$ contribution to $a_{\mu }$ in the mass range $0.35< M^2_{\pi\pi}<0.95$GeV$^2$arepresented\mathrm{.}Thenewvalueof$a^{\pi\pi}_\mu$ has smaller statistical and systematic error and is consistent with the KLOE published value (confirming the current disagreement between the Standard Model prediction for $a_{\mu }$ and the measured value).