Abstract
Parton distributions with an excess of down quarks over up quarks in the sea can reproduce data on the structure functions {ital F}{sub 2}{sup {mu}{ital p}}, {ital F}{sub 2}{sup {mu}{ital n}}, and {ital xscrF}{sub 3}{sup {nu}{ital N}}. A model calculation in chiral field theory shows how an up-down asymmetry can arise from the dissociation of a quark into a quark plus a pion within the nucleon. This effect is large enough to account for the Gottfried-sum-rule defect reported by the New Muon Collaboration. Similar calculations may advance the understanding of other quasistatic properties of hadrons.
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