Subtracting IR Renormalons from Wilson Coefficients: Uniqueness and power dependences on $Lambda_mathrm{QCD}$

Subtracting IR Renormalons from Wilson Coefficients: Uniqueness and power dependences on $Lambda_mathrm{QCD}$
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从威尔逊系数中减去 IR 重正子:$Lambda_mathrm{QCD}$ 的唯一性和幂依赖性

DOI:
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发表时间:
2016
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影响因子:
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通讯作者:
H. Takaura
H. Takaura
中科院分区:
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作者:
G. Mishima;Y. Sumino;H. Takaura

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在促进平等办公室的背景下,η 0近似下,我们提出了一种方法来定义威尔逊系数的不确定性,由于IR重整。我们首先引入一个具有显式IR截止的一般可观测值$X(Q^2)$,然后提取一个真正的UV贡献$X_mathrm{UV}$作为与截止无关的部分。$X_mathrm{UV}$包括功率校正$sim(Lambda_mathrm{QCD}^2/Q^2)^n$,它与重正马龙无关。利用分区积分方法,我们观察到X_mathrm{UV}$与OPE中的主导Wilson系数相一致,同时也阐明了功率修正源于UV区。我们检查计划的依赖性$X_mathrm{UV}$,并挑选出一个具体的计划有利的分析性质。我们的方法将是最佳的系统性,分析性和稳定性。我们用Adler函数,$Q之间的QCD力的例子来测试我们的公式 ar{Q}$和$e^{+} e^{-}$碰撞中的$R$-比。
In the context of OPE and using the large-$eta_0$ approximation, we propose a method to define Wilson coefficients free from uncertainties due to IR renormalons. We first introduce a general observable $X(Q^2)$ with an explicit IR cutoff, and then we extract a genuine UV contribution $X_mathrm{UV}$ as a cutoff-independent part. $X_mathrm{UV}$ includes power corrections $sim (Lambda_mathrm{QCD}^2/Q^2)^n$ which are independent of renormalons. Using the integration-by-regions method, we observe that $X_mathrm{UV}$ coincides with the leading Wilson coefficient in OPE and also clarify that the power corrections originate from UV region. We examine scheme dependence of $X_mathrm{UV}$ and single out a specific scheme favorable in terms of analytical properties. Our method would be optimal with respect to systematicity, analyticity and stability. We test our formulation with the examples of the Adler function, QCD force between $Q ar{Q}$, and $R$-ratio in $e^{+} e^{-}$ collision.
DOI: 10.1016/j.physletb.2012.06.052
发表时间: 2012-06
期刊: Physics Letters B
影响因子: 4.4
作者:
P. Baikov;K. Chetyrkin;J. Kuhn;J. Rittinger
通讯作者: P. Baikov;K. Chetyrkin;J. Kuhn;J. Rittinger