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We investigate the behavior of spin-dependent parton distribution functions(PDFs) at large parton momentum fractions x in the context of global QCDanalysis. We explore the constraints from existing deep-inelastic scatteringdata, and from theoretical expectations for the leading x -> 1 behavior basedon hard gluon exchange in perturbative QCD. Systematic uncertainties from thedependence of the PDFs on the choice of parametrization are studied byconsidering functional forms motivated by orbital angular momentum arguments.Finally, we quantify the reduction in the PDF uncertainties that may beexpected from future high-x data from Jefferson Lab at 12 GeV.

Constraints on spin-dependent parton distributions at large x from global QCD analysis