Ambrosino, F (reprint author), Univ Naples Federico 2, Dipartimento Sci Fisiche, Via Cintia, I-80126 Naples, Italy.
We have studied, with the KLOE detector at the DA Phi NE Phi-Factory, the dynamics of the decay eta -> pi(+) pi(-) pi(0) using eta mesons from the decay ->eta gamma for an integrated luminosity L = 450 pb(-1). From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. An alternative parametrization relates the pi(+) pi(-) pi(0) slopes to that for eta -> 3 pi degrees showing the consistency of KLOE results for both channels. We also obtain the best confirmation of the C-invariance in the eta -> pi(+) pi(-) pi(0) decay.