Phys. Rev. C 74, 035201 (2006) [8 pages]Proton GE/GM from beam-target asymmetryReceived 2 June 2006; published 8 September 2006 The ratio of the proton's electric to magnetic form factor, GE/GM, can be extracted in elastic electron-proton scattering by measuring cross sections, beam-target asymmetry, or recoil polarization. Separate determinations of GE/GM by cross sections and recoil polarization observables disagree for Q2>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 Q2 = 1.51 (GeV/c)2 for target spin orientation aligned perpendicular to the beam momentum direction. This is the largest Q2 at which GE/GM has been determined by a beam-target asymmetry experiment. The result, μGE/GM=0.884±0.027±0.029, is compared to previous world data. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.74.035201
DOI:
10.1103/PhysRevC.74.035201
PACS:
25.30.Bf, 13.40.Gp
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