Parton densities and structure functions beyond the next-to-leading order
W. L. van Neerven, A. Vogt
Abstract
We briefly discuss recent results on the evolution of unpolarized parton densities and structure functions in massless perturbative QCD. Present partial results on the next-to-next-to-leading order (NNLO) evolution kernels prove sufficient for reliable calculations at not too small values of the Bjorken variable, x > 10-3. One order more can be taken into account at x >= 0.2. Inclusion of these terms considerably reduces the main theoretical uncertainties of determinations of alphas (to about 1% at the Z-mass) and the parton densities from structure functions.
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