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The proton's transverse polarization structure is examined in terms of theLorentz-covariant Pauli-Lubanski vector in QCD. We find that there arecontributions from leading, subleading, and next-to-subleading partoniccontributions in the light-front system of coordinates. The subleading andnext-to-subleading contributions are related to the leading one through Lorentzsymmetry. And the leading contribution obeys a simple partonic angular momentumsum rule that gives a clear physical interpretation to a relation knownpreviously.

Transverse Polarization of the Nucleon in Parton Picture