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Spin Structure of the Nucleon: Overview

Yoshitaka Hatta

hep-pharXiv:2607.20761

Abstract

I present a pedagogical review of the decomposition of the proton spin. Both the Jaffe-Manohar and Ji decompositions are discussed. Particular emphasis is placed on the quark and gluon orbital angular momenta, including their gauge invariant definitions, small-x behavior and connection to experimental observables.

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