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Parity-Violating Electron Scattering From 4he And The Strange Electric Form Factor Of The Nucleon, K. A. Aniol, Edgar E. Kooijman
Parity-Violating Electron Scattering From 4he And The Strange Electric Form Factor Of The Nucleon, K. A. Aniol, Edgar E. Kooijman
Edgar E Kooijman
We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from 4He at an average scattering angle ⟨θlab⟩=5.7° and a four-momentum transfer Q2=0.091 GeV2. From these data, for the first time, the strange electric form factor of the nucleon GEs can be isolated. The measured asymmetry of APV=(6.72±0.84(stat)±0.21(syst))×10-6 yields a value of GEs=-0.038±0.042(stat)±0.010(syst), consistent with zero.