Projections for Dark Photon Searches at Mu3e

Abstract

We show that dark photons (A') with masses ~10-80 MeV can be probed in the decay $μ^+ \to e^+ ν_e \barν_μA', A' \to e^+ e^-$, with the upcoming Mu3e experiment at the Paul Scherrer Institute (PSI) in Switzerland. With an expected 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 currently unexplored dark photon parameter space, probing kinetic-mixing parameter, epsilon, as low as epsilon^2 ~ 10^{-7} (10^{-8}). No modifications of the existing Mu3e setup are required.

9 pages, 7 figures; typos corrected, references added