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Strange Magnetism and the Anapole Structure of the Proton

Hasty, R. and Blake, A. and Carr, R. and Covrig, S. and Filippone, B. W. and Gao, J. and Ito, T. M. and Jones, C. E. and Lee, P. and McKeown, R. D. and Savu, V. (2000) Strange Magnetism and the Anapole Structure of the Proton. Science, 290 (5499). pp. 2117-2119. ISSN 0036-8075. doi:10.1126/science.290.5499.2117.

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The violation of mirror symmetry in the weak force provides a powerful tool to study the internal structure of the proton. Experimental results have been obtained that address the role of strange quarks in generating nuclear magnetism. The measurement reported here provides an unambiguous constraint on strange quark contributions to the proton's magnetic moment through the electron-proton weak interaction. We also report evidence for the existence of a parity-violating electromagnetic effect known as the anapole moment of the proton. The proton's anapole moment is not yet well understood theoretically, but it could have important implications for precision weak interaction studies in atomic systems such as cesium.

Item Type:Article
Related URLs:
URLURL TypeDescription
Filippone, B. W.0000-0002-2618-2688
Ito, T. M.0000-0003-3494-6796
Additional Information:© 2000 American Association for the Advancement of Science. Received 12 September 2000; accepted 27 October 2000. The skillful efforts of the staff of the MIT/Bates facility to provide a high-quality beam and improve the experiment are gratefully acknowledged. Supported by NSF grants PHY-9420470 (Caltech), PHY- 9420787 (University of Illinois), PHY-9457906/PHY- 9971819 (University of Maryland), PHY-9733772 (Virginia Polytechnic Institute), DOE cooperative agreement DE-FC02-94ER40818 (MIT/Bates) and contract W-31-109-ENG-38 (Argonne National Laboratory), and the Jeffress Memorial Trust (College of William and Mary, grant no. J-503).
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC02-94ER40818
Department of Energy (DOE)W-31-109-ENG-38
Jeffress Memorial TrustJ-503
Issue or Number:5499
Record Number:CaltechAUTHORS:20141112-124243763
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51663
Deposited By: Tony Diaz
Deposited On:12 Nov 2014 21:27
Last Modified:10 Nov 2021 19:14

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