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Proton G_E/G_M from beam-target asymmetry

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arxiv nucl-ex/0606015 v2 pith:CW2IIEDU submitted 2006-06-07 nucl-ex

M. K. Jones , et al. (Resonance Spin Structure Collaboration) This is my paper · ORCID
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keywords asymmetrybeam-targetbeencrosseitherelasticelectron-protonpolarization
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The ratio of the proton's electric to magnetic form factor, G_E/G_M, can be extracted in elastic electron-proton scattering by measuring either cross sections, beam-target asymmetry or recoil polarization. Separate determinations of G_E/G_M by cross sections and recoil polarization observables disagree for Q^2 > 1 (GeV/c)^2. Measurement by a third technique might uncover an unknown systematic error in either of the previous measurements. The beam-target asymmetry has been measured for elastic electron-proton scattering at Q^2 = 1.51 (GeV/c)^2 for target spin orientation aligned perpendicular to the beam momentum direction. This is the largest Q^2 at which G_E/G_M has been determined by a beam-target asymmetry experiment. The result, \muG_E/G_M = 0.884 +/- 0.027 +/- 0.029, is compared to previous world data.

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