Abstract
We perform a next-to-leading order study of polarized parton distributions as predicted by quark models. The approach allows a detailed investigation of the anomalous contributions as well as angular momentum effects of the partons. Higher-order effects are large in the region 0.01 ⩽ x ⩽ 0.2, where also the introduction of gluon polarization at the hadronic scale plays a crucial role.
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