A measurement of the atomic hydrogen Lamb shift and the proton charge radius

@article{Bezginov2019AMO,
  title={A measurement of the atomic hydrogen Lamb shift and the proton charge radius},
  author={N Bezginov and Travis Valdez and Marko Horbatsch and A Marsman and Amar C Vutha and E A Hessels},
  journal={Science},
  year={2019},
  volume={365},
  pages={1007 - 1012}
}
Unraveling the proton puzzle The discrepancy between the proton size deduced from the Lamb shift in muonic hydrogen and the average, textbook value based on regular (electronic) hydrogen has puzzled physicists for nearly a decade. One possible resolution could be that electrons interact with protons in a different way than muons do, which would require “new physics.” Bezginov et al. measured the Lamb shift in electronic hydrogen, which allowed for a direct comparison to the Lamb shift measured… 
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