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Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon

The HAPPEX Collaboration
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Abstract

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from ^4He at an average scattering angle = 5.7 degrees and a four-momentum transfer Q^2 = 0.091 GeV^2. From these data, for the first time, the strange electric form factor of the nucleon G^s_E can be isolated. The measured asymmetry of A_PV = (6.72 +/- 0.84 (stat) +/- 0.21 (syst) parts per million yields a value of G^s_E = -0.038 +/- 0.042 (stat) +/- 0.010 (syst), consistent with zero.

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The HAPPEX Collaboration. 2005-06-07. Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon. https://doi.org/10.1103/physrevlett.96.022003

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