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 $Lambda_mathrm{QCD}$
复制标题
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
期刊:
影响因子:
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通讯作者:
H. Takaura
中科院分区:
文献类型:
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作者:
G. Mishima;Y. Sumino;H. Takaura
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.
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