We report on a new type of high-energy electron-proton scattering experiment in which longitudinally polarized electrons are scattered from longitudinally polarized protons. The asymmetry in elastic scattering at Q²=0.765 (GeV/c)² was measured; our result agrees with the theoretical asymmetry and determines the sign of GEGM to be positive.
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Alguard et al. (1976) studied this question.
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