Review of experimental and theoretical status of the proton radius puzzle
1 Perimeter Institute for Theoretical Physics, Waterloo, ON, N2L 2Y5 Canada
2 Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
3 TRIUMF, 4004 Wesbrook Mall, Vancouver, BC, V6T 2A3 Canada
a e-mail: email@example.com
Published online: 22 March 2017
The discrepancy between the measured Lamb shift in muonic hydrogen and expectations from electron-proton scattering and regular hydrogen spectroscopy has become known as the proton radius puzzle, whose most “mundane” resolution requires a > 5σ shift in the value of the fundamental Rydberg constant. I briefly review the status of spectroscopic and scattering measurements, recent theoretical developments, and implications for fundamental physics.
© The Authors, published by EDP Sciences, 2017
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