Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-04-20
Phys.Rev. D59 (1999) 014013
Physics
High Energy Physics
High Energy Physics - Phenomenology
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.
Hoodbhoy Pervez
Ji Xiangdong
Lu Wei
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