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Issue 12, 2024
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Physics of our days


Proton charge radius

†  a,  a, b
a Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
b International Center for Quantum Optics and Quantum Technologies (the Russian Quantum Center), Skolkovo Innovation Center, Bolshoi Boulevard, Building 30, Block 1, 3rd floor, sectors G3, G7, Moscow, Moscow Region, 121205, Russian Federation

The so-called proton charge radius puzzle was one of the challenging problems in physics in the last decade. A significant (at the level of four standard deviations (4σ) difference between the values of the root-mean-square proton charge radius measured in normal and muonic hydrogen has kindled lively discussions among both experimentalists and theoreticians specializing in quantum electrodynamics. The problem becomes even more glaring (up to 7σ) if data on the scattering of electrons on protons are taken into account. We review various methods that enable measurement of the proton charge radius, analyze the origin of the disagreement, and present results of recent experiments that aim at resolving this puzzle.

Fulltext pdf (635 KB)
Fulltext is also available at DOI: 10.3367/UFNe.2021.06.038986
Keywords: proton radius, hydrogen atom, muonic hydrogen, proton radius puzzle, Rydberg constant, single-photon spectroscopy, e-p scattering
PACS: 06.20.Jr, 06.30.Ft, 12.20.Fv, 32.10.Fn, 32.30.Jc, 42.62.Fi (all)
DOI: 10.3367/UFNe.2021.06.038986
URL: https://ufn.ru/en/articles/2021/10/d/
000740826300010
2-s2.0-85123456182
Citation: Khabarova K Yu, Kolachevsky N N "Proton charge radius" Phys. Usp. 64 1038–1048 (2021)
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Received: 11th, February 2021, revised: 4th, June 2021, 6th, June 2021

Оригинал: Хабарова К Ю, Колачевский Н Н «Зарядовый радиус протона» УФН 191 1095–1106 (2021); DOI: 10.3367/UFNr.2021.06.038986

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