It is rare to have a discrepancy in such a basic property as proton size,
and yet during the past decade measurements of proton charge radius
using muons and electrons have disagreed by several standard deviations.
The MUon proton Scattering Experiment (MUSE) at the Paul Scherrer
Institute in Switzerland aims to shed more light on this puzzle, by measuring
the elastic scattering of muons, electrons, and positrons on protons in one apparatus.
An overview of the puzzle and the status of this original approach will be presented.
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Elizabeth Brost