Parton densities and structure functions beyond the next-to-leading order

被引：2
作者：
van Neerven, WL [1 ]
Vogt, A [1 ]
机构：
[1] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2000年 / 89卷
关键词：
D O I：
10.1016/S0920-5632(00)00836-7
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We 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 greater than or equal to0.2. 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.
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页码：143 / 148
页数：6
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