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We have measured the ratio$\sigma(e^+e^-\rightarrow\pi^+\pi^-\gamma)/\sigma(e^+e^-\rightarrow\mu^+\mu^-\gamma)$, with the KLOE detector at DA$\Phi$NE for a total integratedluminosity of $\sim$ 240 pb$^{-1}$. From this ratio we obtain the cross section$\sigma(e^+e^-\rightarrow\pi^+\pi^-)$. From the cross section we determine thepion form factor $|F_\pi|^2$ and the two-pion contribution to the muon anomaly$a_\mu$ for $0.592<M_{\pi\pi}<0.975$ GeV, $\Delta^{\pi\pi} a_\mu$= $({\rm385.1\pm1.1_{stat}\pm2.7_{sys+theo}})\times10^{-10}$. This result confirms thecurrent discrepancy between the Standard Model calculation and the experimentalmeasurement of the muon anomaly.

physics letters b

Precision measurement of  $\sigma(e^+e^-\rightarrow\pi^+\pi^-\gamma)/\sigma(e^+e^-\rightarrow  \mu^+\mu^-\gamma)$ and determination of the $\pi^+\pi^-$ contribution to the  muon anomaly with the KLOE detector