The Rydberg constant and proton size from atomic hydrogen

@article{Beyer2017TheRC,
  title={The Rydberg constant and proton size from atomic hydrogen},
  author={Axel Beyer and Lothar Maisenbacher and Arthur Matveev and Randolf Pohl and Ksenia Yu Khabarova and Alexey Grinin and Tobias P. Lamour and Dylan C. Yost and Theodor W. H{\"a}nsch and Nikolai Kolachevsky and Thomas Udem},
  journal={Science},
  year={2017},
  volume={358},
  pages={79 - 85}
}
How big is the proton? The discrepancy between the size of the proton extracted from the spectroscopy of muonic hydrogen and the value obtained by averaging previous results for “regular” hydrogen has puzzled physicists for the past 7 years. Now, Beyer et al. shed light on this puzzle (see the Perspective by Vassen). The authors obtained the size of the proton using very accurate spectroscopic measurements of regular hydrogen. Unexpectedly, this value was inconsistent with the average value of… 

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The smaller r p the authors have now measured supports the value found by two previous muonic hydrogen experiments, and agrees with the revised value for the Rydberg constant, one of the most accurately evaluated fundamental constants in physics.

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The MUon Scattering Experiment (MUSE) at the Paul Scherrer Institute

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While consistent results for the charge radius of the proton have been extracted from elastic electron-scattering data and through the spectroscopy of atomic hydrogen, high-precision studies of

The proton charge radius

Nucleons (protons and neutrons) are the building blocks of atomic nuclei, and are responsible for more than 99% of the visible matter in the universe. Despite decades of efforts in studying its
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