Proton Size Anomaly

被引：94

作者：

Barger, Vernon ^{[1
]}

Chiang, Cheng-Wei ^{[1
,2
,3
,4
]}

Keung, Wai-Yee ^{[5
]}

Marfatia, Danny ^{[1
,6
]}

机构：

[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[2] Natl Cent Univ, Ctr Math & Theoret Phys, Chungli 32001, Taiwan

[3] Natl Cent Univ, Dept Phys, Chungli 32001, Taiwan

[4] Acad Sinica, Inst Phys, Taipei 11925, Taiwan

[5] Univ Illinois, Dept Phys, Chicago, IL 60607 USA

[6] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 15期

关键词：

HADRON DECAY PROCESSES; ELECTRIC POLARIZABILITY; MUONIC HYDROGEN; GAUGE BOSON; QUARK-MODEL; NEUTRON; SEARCH; SCATTERING; CONSTANTS; ATOMS;

D O I：

10.1103/PhysRevLett.106.153001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A measurement of the Lamb shift in muonic hydrogen yields a charge radius of the proton that is smaller than the CODATA value by about 5 standard deviations. We explore the possibility that new scalar, pseudoscalar, vector, and tensor flavor-conserving nonuniversal interactions may be responsible for the discrepancy. We consider exotic particles that, among leptons, couple preferentially to muons and mediate an attractive nucleon-muon interaction. We find that the many constraints from low energy data disfavor new spin-0, spin-1, and spin-2 particles as an explanation.

引用

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