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Title: 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:
 [1];  [2];  [3];  [4]
  1. Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)
  2. Department of Physics and Center for Mathematics and Theoretical Physics, National Central University, Chungli, Taiwan 32001 (China)
  3. Department of Physics, University of Illinois, Chicago, Illinois 60607 (United States)
  4. 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. Fri . "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 = {2011},
month = {4}
}