The discovery of an electric dipole moment (EDM) of the muon would break time invariance and violate the combined symmetry of charge and parity (CP). In the light of the recently reported combined 4.2σ deviation from the SM in the anomalous magnetic dipole moment “(g-2)” of the muon by the Muon g-2 collaboration at Fermilab together with observed tensions in B decays at LHCb, the dedicated muon EDM experiment is very attractive not only to push EDM searches beyond the first generation of fundamental particles, but also to probe the role of the lepton flavour universality in nature.
At PSI we propose an experiment to search for the EDM of the muon based on the frozen-spin technique. We intend to exploit the high electric field, E=1 GV/m, experienced in the rest frame of the muon with a momentum of p=125 MeV/c when passing through a large magnetic field of B=3T. Measured muon fluxes at the muE1 beamline of PSI permit an improved search with a sensitivity of σ(d_μ )≈6× 10^(-23) ecm, about three orders of magnitude more sensitive than for the current upper limit of |d_μ |≤1.8 × 10^(-19) ecm . While a null result would set a significantly improved upper limit on an otherwise un-constrained Wilson coefficient, the discovery of a muon EDM would establish the existence of physics beyond the Standard Model.
 G.W. Bennett, B. Bousquet, H. N. Brown, et al., PRD 80, 052008 (2009)
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Peter Thirolf (LMU) / Norbert Kaiser (TUM)