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We have studied the eta->pi+pi-e+e-(gamma) decay using about 1.7 fb^-1collected by the KLOE experiment at the DAFNE phi-factory. This corresponds toabout 72 millions eta mesons produced in phi radiative decays. We have measuredthe 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. Wehave obtained the first measurement of the CP-odd pipi-ee decay planes angularasymmetry, A_phi = (-0.6 +/- 2.5_Stat. +/- 1.8_Syst.) x 10^-2.

Measurement of the branching ratio and search for a CP violating asymmetry in the eta -> pi+pi-e+e-(gamma) decay at KLOE