The Proton Radius Puzzle
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The proton size, specifically its charge radius, was thought known to about 1% accuracy. Now a new method probing the proton with muons instead of electrons finds a radius about 4% smaller, and to boot gives an uncertainty limit of about 0.1%. We review the different measurements, some of the calculations that underlie them, some of the suggestions that have been made to resolve the conflict, and give a brief overview new related experimental initiatives. At present, however, the resolution to the problem remains unknown.
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Forward citations
Cited by 1 Pith paper
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Sensitivity of the photon-induced processes to the proton radius
Fitting ATLAS and CMS dilepton data within a dipole form factor model yields an effective proton radius of 1.002 ± 0.038 fm, showing sensitivity to the radius but not resolving the puzzle.
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