The Proton Radius Puzzle

By C. Carlson. 2015

251 citations recorded by the source corpus.

Abstract 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7e84e3f147bcb31632affa079bfaff33d9050607

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Artificial Intelligence

1. D. DeMille
2. C. Fischer
3. Dmitry Budker

In Atomic and Molecular Physics, and Optics

1. D. DeMille
2. C. Clark
3. Andrei Derevianko
4. Marianna S. Safronova
5. C. Fischer
6. Dmitry Budker
7. D. F. Kimball

In Nuclear and High Energy Physics

1. C. Fischer
2. G. Eichmann
3. H. Sanchis-Alepuz
4. Richard Williams
5. R. Alkofer
6. D. DeMille
7. C. Clark
8. Andrei Derevianko

Citations in the corpus

• Baryons as relativistic three-quark bound states (2016, background): “Therefore, at present it seems unlikely that TPE effects can resolve the proton radius puzzle unless one is willing to account for ‘haywire’ hadronic effects [1, 690].”
• Search for New Physics with Atoms and Molecules (2017, background): “The proton radius puzzle, as it is known colloquially, has perplexed the physics community for over half a decade (Carlson, 2015; Hill, 2017; Jentschura, 2011; Pohl, 2016; Pohl et al., 2013).”