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We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-,with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decaysignal of ~31,000 events from which we measured a value of BR(phi -> etae+e-)=(1.075+-0.007+-0.038)x10-4. The same sample is used to determine thetransition form factor by a fit to the e+e- invariant mass spectrum, obtainingb(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five theprecision of the previous measurement and is in good agreement with VMDexpectations.

Study of Dalitz decay phi -> eta e+e- with KLOE detector