Measurement of hadronic cross section and preliminary results on the pion form factor using the radiative return at DAPHNE

Abstract

In the fixed energy environment of the $e^{+}e^{-}$ collider DA$Φ$NE, KLOE can measure the cross section of the process $e^{+}e^{-} \to$ hadrons as a function of the hadronic system energy using the radiative return. At energies below 1 GeV, $e^{+}e^{-} \to ρ\to π^{+}π^{-}$ is the dominating hadronic process. We report here on the status of the analysis for the $e^{+}e^{-} \to \ppg$ channel, which allows to obtain a preliminary measurement of the pion form factor using an integrated luminosity of $\sim73 pb^{-1}$.