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Transverse Asymmetries from Nuclei in Electron Scattering

Measurements at Jeﬀerson Lab of the transverse asymmetry A T in few-GeV electron scattering from various nuclei at forward angles will be presented. The electron’s spin is polarized transverse to its momentum. The asymmetry arises from the interference of one-photon and two-photon exchange and is a potentially important systematic for parity-violating electron scattering experiments. The nuclei measured are H, 2 H, 4 He, 12 C, and 208 Pb at corresponding kinematics ( E , θ ) (GeV, degrees) = (3.18, 6), (6.06, 13), (2.75, 6), (1.05, 5) and (1.05, 5). The asymmetries are a few parts per million (ppm) and will be compared to available theoretical calculations.