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De Lucia, E. Graziani, E. Iarocci, F. Bossi, F. Ceradini, F. Curciarello, F. Gonnella, F. Happacher, F. Loddo, F. Nguyen, G. Bencivenni, G. Capon, G. De Robertis, G. Fanizzi, G. Felici, G. Giardina, G. Mandaglio, G. Morello, G. Venanzoni, I. Balwierz-Pytko, I. Prado Longhi, I. Sarra, J. Lee-Franzini, J. Zdebik, KLOE, KLOE-2 Collaborations: D. Babusci, L. Caldeira Balkestahl, L. Heijkenskjold, L. Iafolla, L. Tortora, M. Jacewicz, M. Martemianov, M. Martini, M. Mascolo, M. Schioppa, M. Silarski, M. Wolke, O. Erriquez, P. Branchini, P. Ciambrone, P. De Simone, P. Franzini, P. Gauzzi, P. Lukin, P. Moskal, P. Santangelo, R. Messi, R. Versaci, S. Fiore, S. Giovannella, S. Miscetti, S. Muller, T. Johansson, V. De Leo, V. Patera, W. Kluge, W. Wislicki","submitted_at":"2012-12-18T22:10:29Z","abstract_excerpt":"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 integrated luminosity 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 the pion 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, $\\Delta^{\\pi\\pi} a_\\mu$= $({\\rm 385.1\\pm1.1_{stat}\\pm2.7_{sys+theo}})\\times10^{-10}$. 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