We argue that the sea of virtual quark-antiquark pairs in a proton is polarized. Quantum chromodynamics allows a valence quark to emit a gluon which then produces pairs. If the parent quark in this process exhibits a (1-x)³ behavior as x→1 then the antiquark with helicity the same as the original quark will have a leading (1-x)⁵ distribution. Implications for the counting rules and for polarized Drell-Yan annihilation are discussed.
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Close et al. (1977) studied this question.
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