  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 1.7
fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay
signal of ~31,000 events from which we measured a value of BR(phi -> eta
e+e-)=(1.075+-0.007+-0.038)x10-4. The same sample is used to determine the
transition form factor by a fit to the e+e- invariant mass spectrum, obtaining
b(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the
precision of the previous measurement and is in good agreement with VMD
expectations.

High Energy Physics - Experiment