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Published January 8, 2010 | public
Journal Article

Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment


We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q^2=0.22 and 0.63  GeV^2. They are sensitive to strange quark contributions to currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of ≲10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial-vector current at these four-momentum transfers.

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© 2010 American Physical Society. Received 29 September 2009; published 8 January 2010. We gratefully acknowledge the strong technical contributions to this experiment from many groups: Caltech, Illinois, LPSC-Grenoble, IPN-Orsay, TRIUMF, and particularly the Accelerator and Hall C groups at Jefferson Lab. CNRS (France), DOE (U.S.), NSERC (Canada), and NSF (U.S.) supported this work in part.

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August 19, 2023
October 19, 2023