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Venanzoni, G. Xu, J. Lee-Franzini, KLOE collaboration: F. Ambrosino, L. Tortora, M. Antonelli, M. Dreucci, M. Martini, M. Moulson, M. Napolitano, M. Palutan, M. Testa, P. Beltrame, P. Branchini, P. Ciambrone, P. De Simone, P. Franzini, P. Gauzzi, P. Massarotti, P. Santangelo, P. Valente, R. Versaci, S. Bertolucci, S. Bocchetta, S. Fiore, S. Giovannella, S. Meola, S. Miscetti, S. M\\\"uller, T. Capussela, T. Spadaro, V. Patera","submitted_at":"2008-12-28T17:13:26Z","abstract_excerpt":"We have studied the eta->pi+pi-e+e-(gamma) decay using about 1.7 fb^-1 collected by the KLOE experiment at the DAFNE phi-factory. This corresponds to about 72 millions eta mesons produced in phi radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(eta->pi+pi-e+e-(gamma)) = (26.8 +/- 0.9_Stat. +/- 0.7_Syst.) x 10^-5. 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