An Overview of the MUSE Experiment

In 2010, the "Proton Radius Puzzle" (PRP) was born when μH spectroscopy measurements extracted the protons radius to be ~ 0.842 ± 0.001 fm. This represented a ~ 5σ deviation from the average electron-based extractions at the time. Possible explanations include questions of lepton universality, differences in the handling of radiative corrections or underestimated systematic uncertainties in the experiments or in the extraction of the radius from the data. The MUon Scattering Experiment (MUSE) was inspired directly by the PRP. MUSE aims to shed some light on this puzzle via simultaneous ep and μp scattering at both charge polarities. MUSE is housed at the πM1 beam line at the Paul Scherrer Institute, which is a mixed beam of e, μ and π. As well, MUSE has the unique capability to directly test lepton universality and the two-photon exchange effect. An overview of MUSE, its current status, and future analysis timelines will be discussed.