期刊
PHYSICAL REVIEW LETTERS
卷 106, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.153001
关键词
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资金
- DOE [DE-FG02-84ER40173, DE-FG02-95ER40896, DE-FG02-04ER41308]
- NSF [PHY-0544278]
- NSC [97-2112-M-008-002-MY3]
- NCTS
- WARF
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.
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