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The Proton Radius Puzzle

Carl E. Carlson
(
- William-Mary Coll.
)

Feb 18, 2015

19 pages

Published in:

Prog.Part.Nucl.Phys. 82 (2015) 59-77

Published: May, 2015

e-Print:

1502.05314 [hep-ph]

DOI:

10.1016/j.ppnp.2015.01.002

View in:

ADS Abstract Service

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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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