Fitting dilepton production data in pp collisions with a dipole form factor model yields Λ² = 0.465 ± 0.056 GeV² (rp = 1.002 ± 0.038 fm), showing sensitivity to proton radius at high masses and forward rapidities but not resolving the puzzle.
The Proton Radius Puzzle
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abstract
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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Sensitivity of the photon-induced processes to the proton radius
Fitting dilepton production data in pp collisions with a dipole form factor model yields Λ² = 0.465 ± 0.056 GeV² (rp = 1.002 ± 0.038 fm), showing sensitivity to proton radius at high masses and forward rapidities but not resolving the puzzle.