Searches for Dark Forces with KLOE

Some models of physics beyond the Standard Model have predicted the existence of a light neutral vector particle, called the U boson, which would mediate a new dark gauge interaction. KLOE has searched for the production of U bosons in five analyses comprising four types of production processes with various final states. We've used Dalitz decays of the ϕ   meson, ϕ→ηUϕ→ηU with U→e+e−U→e+e− and the two final states η→π+π−π0η→π+π−π0 and η→π0π0π0η→π0π0π0, to provide limits on the mixing strength between the dark sector and the Standard Model in the range 50