A sum rule is derived for the asymmetry in deep-inelastic scattering of polarized electrons from polarized protons: ∫0¹dξgᵉᵖ(ξ)≈0.15gA. The result follows from the quark light-cone algebra and the assumption that strange quarks do not contribute to the asymmetry. The latter is justified by conventional parton-model arguments.
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Ellis et al. (1974) studied this question.
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