The proton size puzzle: experiment vs theory

被引：2

作者：

Dorokhov, A. E. ^{[1
]}

Martynenko, A. P. ^{[2
]}

Martynenko, F. A. ^{[2
]}

Radzhabov, A. E. ^{[3
,4
]}

机构：

[1] JINR, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

[2] Samara Univ, Samara 443086, Russia

[3] RAS, Matrosov Inst Syst Dynam & Control Theory, SB, Irkutsk 664033, Russia

[4] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

来源：

XXTH INTERNATIONAL SEMINAR ON HIGH ENERGY PHYSICS (QUARKS-2018) | 2018年 / 191卷

基金：

俄罗斯基础研究基金会; 俄罗斯科学基金会;

关键词：

LAMB SHIFT; PSEUDOSCALAR MESONS; HYPERFINE-STRUCTURE; ZEMACH; SPIN;

D O I：

10.1051/epjconf/201819104001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Current status of the proton size puzzle from experimental and theoretical points of view is briefly discussed. The interest to these studies is primarily related to experiments conducted by the CREMA collaboration (Charge Radius Experiments with Muonic Atoms) with muonic hydrogen and deuterium by methods of laser spectroscopy. As a result a more accurate value of the proton charge radius was found to be r(p) = 0.84184(67) fm, which is different from the value recommended by CODATA for 7 sigma. In the second part we discuss recent calculations of the contribution of light pseudoscalar (PS) and axial-vector (AV) mesons to the interaction operator of a muon and a proton in muonic hydrogen atom, with the coupling of mesons to the muon being via two-photon intermediate state. Numerical estimates of the contributions to the hyperfine structure of the spectrum of the S and P levels are presented. It is shown that such contribution to the hyperfine splitting in muonic hydrogen is rather important for a comparison with precise experimental data.

引用

页数：7

共 43 条

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