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We show that dark photons (A') with masses ~10-80 MeV can be probed in thedecay $\mu^+ \to e^+ \nu_e \bar{\nu}_\mu A', A' \to e^+ e^-$, with the upcomingMu3e experiment at the Paul Scherrer Institute (PSI) in Switzerland. With anexpected 10^{15} (5.5 x 10^{16}) muon decays in 2015-2016 (2018 and beyond),Mu3e has the exciting opportunity to probe a substantial fraction of currentlyunexplored dark photon parameter space, probing kinetic-mixing parameter,epsilon, as low as epsilon^2 ~ 10^{-7} (10^{-8}). No modifications of theexisting Mu3e setup are required.

Projections for Dark Photon Searches at Mu3e