MUSE: The MUon Scattering Experiment*

In 2010, a measurement of the proton charge radius made using muonic hydrogen spectroscopy contradicted established radius values compiled from electron-proton scattering and atomic hydrogen spectroscopy, initiating the proton radius puzzle. The MUon Scattering Experiment (MUSE) operating at the PiM1 beam line at the Paul Scherrer Institute endeavors to inform the puzzle by simultaneously measuring elastic electron-proton and muon-proton scattering from a liquid-hydrogen target. Moreover, MUSE will measure not only e^-p and μ^-p scattering, but also e⁺p and μ⁺p scattering. Measuring cross sections for both charge states and lepton species in lepton-proton elastic scattering enables MUSE to test lepton universality and directly measure two-photon exchange, in addition to its principal objective of extracting form factors and proton radii. This talk will provide an overview of MUSE and an update on its current status.