Assertion: proton's quark | /r/CapableOf | have in leading-order pqcd
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text: In leading-order pQCD, the quark (either the up or the down quark) which carries a majority of the nucleon's energy should have its spin aligned parallel to the nucleon spin, while in the valence quark model, the down quark carrying most of the nucleon's energy has its spin on average anti-aligned to the nucleon spin.