高阶QCD修正的估计:理论与应用
高能物理 - 唯象学
2009-10-28 v2
摘要
我们考虑了欧几里得区域高阶微扰修正估计形式体系的进一步发展,该形式体系基于方案无关方法的应用,即最小灵敏度原理和有效电荷方法。我们给出了欧几里得量O(α_s^4)阶QCD修正的估计:e^+e^-湮灭D函数、深度非弹性散射求和规则,即非极化和极化Bjorken求和规则,以及Gross-Llewellyn Smith求和规则。D函数的结果进一步应用于估计闵可夫斯基量R(s) = σ_{tot}(e^{+}e^{-} → 强子)/σ(e^{+}e^{-} → μ^{+}μ^{-})和R_τ = Γ(τ → ν_τ + 强子)/Γ(τ → ν_τ \overline{ν}_e e)的O(α_s^4)阶QCD修正。文中还讨论了由所考虑量的O(α_s^5)阶修正引起的不确定性固定问题。
引用
@article{arxiv.hep-ph/9408395,
title = {Estimates of the higher-order QCD corrections: Theory and Applications},
author = {A. L. Kataev and V. V. Starshenko},
journal= {arXiv preprint arXiv:hep-ph/9408395},
year = {2009}
}
备注
revised version and improved version of CERN.TH-7400/94, LATEX 10 pages, six-loop estimates for R(s) in Table 2 are revised, thanks to J. Ellis for pointing numerical shortcomings (general formulae are non-affected). Details of derivations of six-loop estimates for R_tau are presented