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Happacher, F. Loddo, F. Nguyen, G. Bencivenni, G. Capon, G. De Robertis, G. Fanizzi, G. Felici, G. Giardina, G. Mandaglio, G. Morello, G. Venanzoni, G. Xu, I. Balwierz-Pytko, I. Prado Longhi, I. Sarra, J. Lee-Franzini, J. Zdebik, L. Caldeira Balkest, 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. Moskal, P. Santangelo, R. Di Salvo, R. Messi, R. Versaci, S. Fiore, S. Giovannella, S. Loffredo, S. Miscetti, T. Johansson, V. Bocci, V. Patera, W. Wislicki","submitted_at":"2012-09-20T18:57:48Z","abstract_excerpt":"The ratio R_{\\eta}=\\Gamma(\\eta -> \\pi^+\\pi^-\\gamma)/\\Gamma(\\eta -> \\pi^+\\pi^-\\pi^0) has been measured by analyzing 22 million \\phi \\to \\eta \\gamma decays collected by the KLOE experiment at DA\\PhiNE, corresponding to an integrated luminosity of 558 pb^{-1}. 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