The Proton Radius Puzzle
Feb 18, 201519 pages
Published in:
- Prog.Part.Nucl.Phys. 82 (2015) 59-77
- Published: May, 2015
e-Print:
- 1502.05314 [hep-ph]
View in:
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Abstract: (Elsevier)
The proton size, specifically its charge radius, was thought known to about 1% accuracy. Now a new method probing the proton with muons instead of electrons finds a radius about 4% smaller, and to boot gives an uncertainty limit of about 0.1%. We review the different measurements, some of the calculations that underlie them, some of the suggestions that have been made to resolve the conflict, and give a brief overview new related experimental initiatives. At present, however, the resolution to the problem remains unknown.Note:
- Accepted invited review for Progress in Particle and Nuclear Physics. 28 pages, 15 figures
- Proton radius
- Form factors
- Muonic atoms
- p: size
- p: charge radius
- correction: Coulomb
- correction: two-photon
- hydrogen: muonic atom
- deuterium: muonic atom
References(108)
Figures(19)
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