Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-06-20
Nucl.Phys.Proc.Suppl. 89 (2000) 143-148
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages LaTeX including 6 eps-figures. Talk presented at `Loops and Legs in Quantum Field Theory', Bastei (Germany) April 2000
Scientific paper
10.1016/S0920-5632(00)00836-7
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 alpha_s (to about 1% at the Z-mass) and the parton densities from structure functions.
van Neerven W. L.
Vogt Adam
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