Quark Orbital-Angular-Momentum Distribution in the Nucleon

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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8 pages, latex, no figures, minor corrections made

Scientific paper

10.1103/PhysRevD.59.014013

We introduce gauge-invariant quark and gluon angular momentum distributions after making a generalization of the angular momentum density operators. From the quark angular momentum distribution, we define the gauge-invariant and leading-twist quark {\it orbital} angular momentum distribution $L_q(x)$. The latter can be extracted from data on the polarized and unpolarized quark distributions and the off-forward distribution $E(x)$ in the forward limit. We comment upon the evolution equations obeyed by this as well as other orbital distributions considered in the literature.

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