Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen

@article{Antognini2013ProtonSF,
  title={Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen},
  author={A. Antognini and F. Nez and K. Schuhmann and F. Amaro and F. Biraben and J. Cardoso and D. Covita and A. Dax and S. Dhawan and M. Diepold and L. Fernandes and A. Giesen and A. L. Gouvea and T. Graf and T. H{\"a}nsch and P. Indelicato and L. Julien and Cheng-Yang Kao and P. Knowles and F. Kottmann and E. Le Bigot and Yi-Wei Liu and J. Lopes and L. Ludhova and C. Monteiro and F. Mulhauser and T. Nebel and P. Rabinowitz and J. D. dos Santos and L. Schaller and C. Schwob and D. Taqqu and J. Veloso and J. Vogelsang and R. Pohl},
  journal={Science},
  year={2013},
  volume={339},
  pages={417 - 420}
}
Proton Still Too Small Despite a proton's tiny size, it is possible to measure its radius based on its charge or magnetization distributions. Traditional measurements of proton radius were based on the scattering between protons and electrons. Recently, a precision measurement of a line in the spectrum of muonium—an atom consisting of a proton and a muon, instead of an electron—revealed a radius inconsistent with that deduced from scattering studies. Antognini et al. (p. 417; see the… Expand
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