标题： 理论不确定性在结构函数QCD演化中的影响以及对$α_s(M_Z^2)$的影响 显示英文标题

标题： Theoretical Uncertainties in the QCD Evolution of Structure Functions and their Impact on $α_s(M_Z^2)$

摘要： 各种次领头阶方案在QCD部分子密度和结构函数演化中的差异被讨论。它们的定量影响可以准确到0.02%。研究了由于选择重整化和因子化尺度的自由度所带来的不确定性。对于HERA可访问的运动学区域，估计了不同不确定性对从深度非弹性散射中的标度违反中提取强耦合常数$\alpha_s$的定量后果。 显示英文摘要

摘要： The differences are discussed between various next-to-leading order prescriptions for the QCD evolution of parton densities and structure functions. Their quantitative impact is understood to an accuracy of 0.02\%. The uncertainties due to the freedom to choose the renormalization and factorization scales are studied. The quantitative consequences of the different uncertainties on the extraction of the strong coupling constant $\alpha_s$ from scaling violations in deep--inelastic scattering are estimated for the kinematic regime accessible at HERA.