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The existence of a light dark force mediator has been tested with the KLOEdetector at DAPHNE. This particle, called U, is searched for using the decaychain phi-->etaU, eta-->pi+pi-pi0, U-->e+e-. No evidence is found in 1.5 fb-1of data. The resulting exclusion plot covers the mass range 5<M_U<470 MeV,setting an upper limit on the ratio between the U boson coupling constant andthe fine structure constant, alpha'/alpha, of <= 2x10^-5 at 90% C.L. for50<M_U<420 MeV.

Search for a vector gauge boson in phi meson decays with the KLOE detector