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Variational perturbation theory and nonperturbative calculations in QCD

机译:QCD中的变分摄动理论和非摄动计算

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摘要

A nonperturbative approach based on the variational perturbation theory in quantum chromodynamics is developed. The variational series is different from the conventional perturbative expansion and can be used to go beyond the weak-coupling regime. The approach suggested takes into account the summation of threshold singularities and the involvement of nonperturbative light quark masses. Phenomenological applications of this approach to describe physical quantities connected with the hadronic τ-decay data: the R_τ ratio, the light-quark Adler function, and the smeared R Δ function are presented. The description of examined quantities includes an infrared region and, therefore, they cannot be directly calculated within the standard perturbation theory. It is shown that in spite of this fact the approach suggested gives a rather good result for these quantities down to the lowest energy scale.
机译:提出了一种基于变分摄动理论的非扰动方法。变分级数不同于传统的扰动展开,可以用于超越弱耦合机制。建议的方法考虑了阈值奇异值的总和以及非扰动轻夸克质量的参与。介绍了这种方法在现象学上的应用,以描述与强子τ衰变数据有关的物理量:R_τ比率,轻夸克Adler函数和模糊RΔ函数。对检查量的描述包括一个红外区域,因此,不能在标准摄动理论内直接计算它们。结果表明,尽管存在这一事实,但对于最小的能量规模,对于这些数量,建议的方法还是给出了很好的结果。

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