Status of the muEDM experiment at PSI

TL;DR

The muEDM experiment at PSI aims to detect a muon electric dipole moment using a novel frozen spin technique, potentially revealing new sources of CP violation beyond the Standard Model.

Contribution

This paper reports the status and future plans of the muEDM experiment, introducing a pioneering frozen spin method to improve muon EDM sensitivity significantly.

Findings

Feasibility of the frozen spin technique demonstrated by 2026

Expected sensitivity competitive with muon g-2 experiments

Goal to enhance sensitivity by a factor of 100 by early 2030s

Abstract

Explaining the matter-antimatter asymmetry in the Universe requires new sources of CP violation beyond the predictions of the Standard Model (SM). Electric dipole moments (EDMs) of particles, being zero if CP is exactly conserved and extremely small in the SM, are a very clean and sensitive probe for new physics. We will present the status of the muEDM experiment, a search for a muon EDM at PSI (CH) pioneering the frozen spin technique. Muons will be stored in a solenoid, with a radial electric field tuned to eliminate the spin precession generated by the magnetic moment. Measuring a residual, longitudinal precession would indicate a non-zero EDM. The first phase of the experiment will demonstrate, by 2026, the feasibility and unique potential of the technique, while reaching a sensitivity competitive with the parasitic measurements performed in the muon $g-2$ experiments. The ultimate goal of the muEDM experiment is to improve this sensitivity by a factor of 100 by the early 2030s.