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We provide a theoretical basis for understanding the spin structure of theproton in terms of the spin and orbital angular momenta of free quarks andgluons in Feynman's parton picture. We show that each term in the Jaffe-Manoharspin sum rule can be related to the matrix element of a gauge-invariant, butframe-dependent operator through a matching formula in large-momentum effectivefield theory. We present all the matching conditions for the spin content atone-loop order in perturbation theory, which provide a basis to calculateparton orbital angular momentum in lattice QCD at leading logarithmic accuracy.

Justifying the Naive Partonic Sum Rule for Proton Spin