Measurement of the neutral weak form factors of the proton

HAPPEX Collaboration

Research output: Contribution to journalArticlepeer-review

128 Scopus citations


We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point [⟨θlab⟩=12.3° and ⟨Q2⟩=0.48(GeV/c)2] is chosen to provide sensitivity, at a level that is of theoretical interest, to the strange electric form factor G8 E. The result, A=-14.5±2.2ppm, is consistent with the electroweak standard model and no additional contributions from strange quarks. In particular, the measurement implies G8 E+0.39G8 E=0.023 ± 0.034(stat) ± 0.022(syst) ± 0.026(δGn E), where the last uncertainty arises from the estimated uncertainty in the neutron electric form factor.

Original languageEnglish (US)
Pages (from-to)1096-1100
Number of pages5
JournalPhysical Review Letters
Issue number6
StatePublished - 1999

ASJC Scopus subject areas

  • General Physics and Astronomy


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