Measurement of the Neutral Weak Form Factors of the Proton

Details Measurement of the Neutral Weak Form Factors of the Proton Measurement of the Neutral Weak Form Factors of the Proton

1998-10-16

arxiv.org/abs/nucl-ex/9810012v1

Phys.Rev.Lett.82:1096-1100,1999

Physics

Nuclear Physics

Nuclear Experiment

10 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.1096

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point (theta_lab = 12.3 degrees and Q^2=0.48 (GeV/c)^2) is chosen to provide sensitivity, at a level that is of theoretical interest, to the strange electric form factor G_E^s. The result, A=-14.5 +- 2.2 ppm, is consistent with the electroweak Standard Model and no additional contributions from strange quarks. In particular, the measurement implies G_E^s + 0.39G_M^s = 0.023 +- 0.034 (stat) +- 0.022 (syst) +- 0.026 (delta G_E^n), where the last uncertainty arises from the estimated uncertainty in the neutron electric form factor.

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