Parity-violating electron scattering from 4He and the strange electric form factor of the nucleon.

Journal article

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 Q2 = 0.091 GeV2 . From these data, for the first time, the strange electric form factor of the nucleon G(E)s can be isolated. The measured asymmetry of A(PV) = (6.72 +/- 0.84(stat) +/- 0.21(syst) x 10(-6) yields a value of G(E)s = -0.038 +/- 0.042(stat) +/- 0.010(syst), consistent with zero.

Authors: Aniol, K; Armstrong, D; Averett, T; Benaoum, H; Bertin, P

• Publication status: Published
• Journal: Physical Review Letters
• Volume: 96
• Issue: 2
• Pages: 022003
• Publication date: 2006-01-01
• DOI: 10.1103/physrevlett.96.022003
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: HAPPEX Collaboration