The Angular Momentum and g1p Sum Rules for the Proton
G. M. Shore
Abstract
The gauge invariant operator formulation of the angular momentum sum rule 12 = Jq + Jg for the proton is presented and contrasted with the sum rule for the first moment of the polarised structure function g1p. The decoupling of the axial charge a0 from the angular momentum sum rule is highlighted and the possible QCD field-theoretic basis for an angular momentum sum rule of the form 12 = 12 q + g + Lq + Lg is critically discussed.
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