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

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Abstract
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 in muonic hydrogen. The two results agreed, but the discrepancy with the averaged value remains. Science , this issue p. 1007
Funding Information
  • Ontario Research Foundation
  • Natural Sciences and Engineering Research Council of Canada
  • Canada Foundation for Innovation
  • Canada Research Chairs
  • National Institute for Standards and Technology

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