The Proton Radius Puzzle

@article{Carlson2015ThePR,
  title={The Proton Radius Puzzle},
  author={C. Carlson},
  journal={Progress in Particle and Nuclear Physics},
  year={2015},
  volume={82},
  pages={59-77}
}
  • C. Carlson
  • Published 2015
  • Physics
  • Progress in Particle and Nuclear Physics
  • 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… CONTINUE READING
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