Search for the decay ϕ→K0K¯0γ with the KLOE experiment

We have searched for the decay ϕ→K0K¯0γ, by detecting KS pairs plus a photon and with the KS-mesons decaying to π+π−, in a sample of about 1.5×109ϕ-decays collected by the KLOE experiment at DAΦNE. The reaction proceeds through the intermediate states f0(980)γ, a0(980)γ. We find five events with 3.2 events expected from background processes. We obtain the upper limit: BR(ϕ→K0K¯0γ)<1.9×10−8 at 90% CL.