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The existence of a new, photon-like, massive particle, the gamma' or darkphoton, is postulated in several extensions of the Standard Model. These modelsare often advocated to explain some recent puzzling astrophysical observations,as well as to solve the unsofar unexplained deviation between the measured andcalculated values of the muon anomaly. Dark photons can be produced at e+e-colliders both in continuum events and in vector meson transitions and caneventually decay into an electron-positron pair. For a proper choice of theparameters of the theory, a $\gamma'$ can have a relatively long lifetime andcan therefore be observed as an e+e- vertex well separated by the primaryinteraction point. This case is discussed in reference to very high luminositye+e- colliders either in construction or under study in several laboratories inthe world. It is shown that a search strategy based on the detection ofdisplaced vertices can be in principle very effective in covering a rather wideand to date unexplored region of the theoretical parameters space.

Dark photon searches using displaced vertices at low energy e+e- colliders