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Measurement of the neutral weak form-factors of the proton

Abstract : 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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Contributeur : Michèle Chadelas <>
Soumis le : lundi 10 mai 1999 - 13:54:02
Dernière modification le : mardi 19 mai 2020 - 09:14:12

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K.A. Aniol, D.S. Armstrong, M. Baylac, E. Burtin, J. Calarco, et al.. Measurement of the neutral weak form-factors of the proton. Physical Review Letters, American Physical Society, 1999, 82, pp.1096-1100. ⟨in2p3-00003637⟩



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