Improving large-order perturbative expansions in quantum chromodynamics.
Improving large-order perturbative expansions in quantum chromodynamics.
复制标题
改进量子色动力学中的大阶微扰展开。
DOI：
10.1103/physrevlett.69.2472
复制
发表时间：
1992
影响因子：
8.6
通讯作者：
Zakharov
中科院分区：
文献类型：
--
作者：
Beneke;Zakharov
我们考虑量子电动力学和色动力学中大阶微扰展开的发散，并集中研究大阶贡献对耦合常数归一化点选择的依赖性。我们发现，对于符号交替序列，通过正确选择归一化点，可以极大地提高通过渐近展开的最小项来衡量的微扰理论的预测能力。特别是，这可以消除量子色动力学中微扰展开的主要不确定性。
We consider divergences of the perturbative expansions in large orders in quantum electro- and chromodynamics and concentrate on the dependence of large-order contributions on the choice of the normalization point of coupling constants. We find that for sign-alternating series the predictive power of perturbation theory as measured by the minimal term of an asymptotic expansion can be drastically improved by a proper choice of the normalization point. In particular, this allows the elimination of the leading uncertainty of perturbative expansions in quantum chromodynamics.