Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published December 15, 2000 | public
Journal Article

Strange Magnetism and the Anapole Structure of the Proton


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.

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).

Additional details

August 19, 2023
October 18, 2023