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$\Phi$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, $e^{+}{e}^{-}\to \rho \to {\pi }^{+}{\pi }^{-}$ 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 $\sim 73p{b}^{-1}$.

Invited talk at the Seventh International Workshop on Tau Lepton Physics (TAU02-WE07), Santa Cruz, Ca, USA, Sept 2002, 9 pages, LaTeX, 9 eps figures