Proton Size Anomaly
Abstract
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.
- Authors:
-
- Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
- Department of Physics and Center for Mathematics and Theoretical Physics, National Central University, Chungli, Taiwan 32001 (China)
- Department of Physics, University of Illinois, Chicago, Illinois 60607 (United States)
- Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045 (United States)
- Publication Date:
- OSTI Identifier:
- 21550298
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevLett.106.153001; (c) 2011 American Institute of Physics; Journal ID: ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; FLAVOR MODEL; HYDROGEN; LAMB SHIFT; MUON-NUCLEON INTERACTIONS; MUONS; PROTONS; SPIN; VECTORS; ANGULAR MOMENTUM; BARYONS; COMPOSITE MODELS; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; HADRONS; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LEPTONS; MATHEMATICAL MODELS; NONMETALS; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE MODELS; PARTICLE PROPERTIES; QUARK MODEL; SPECTRAL SHIFT; TENSORS
Citation Formats
Barger, Vernon, Chiang, Cheng-Wei, Institute of Physics, Academia Sinica, Nankang, Taipei 11925, Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, Keung, Wai-Yee, Marfatia, Danny, and Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706. Proton Size Anomaly. United States: N. p., 2011.
Web. doi:10.1103/PHYSREVLETT.106.153001.
Barger, Vernon, Chiang, Cheng-Wei, Institute of Physics, Academia Sinica, Nankang, Taipei 11925, Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, Keung, Wai-Yee, Marfatia, Danny, & Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706. Proton Size Anomaly. United States. https://doi.org/10.1103/PHYSREVLETT.106.153001
Barger, Vernon, Chiang, Cheng-Wei, Institute of Physics, Academia Sinica, Nankang, Taipei 11925, Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, Keung, Wai-Yee, Marfatia, Danny, and Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706. 2011.
"Proton Size Anomaly". United States. https://doi.org/10.1103/PHYSREVLETT.106.153001.
@article{osti_21550298,
title = {Proton Size Anomaly},
author = {Barger, Vernon and Chiang, Cheng-Wei and Institute of Physics, Academia Sinica, Nankang, Taipei 11925 and Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 and Keung, Wai-Yee and Marfatia, Danny and Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.106.153001},
url = {https://www.osti.gov/biblio/21550298},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 15,
volume = 106,
place = {United States},
year = {Fri Apr 15 00:00:00 EDT 2011},
month = {Fri Apr 15 00:00:00 EDT 2011}
}
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