Subtracting infrared renormalons from Wilson coefficients: Uniqueness and power dependences on ΛqCD

Go Mishima, Yukinari Sumino, Hiromasa Takaura

研究成果: Article査読

9 被引用数 (Scopus)

抄録

In the context of operator product expansion (OPE) and using the large-β0 approximation, we propose a method to define Wilson coefficients free from uncertainties due to IR renormalons. We first introduce a general observable X(Q2) with an explicit IR cutoff, and then we extract a genuine UV contribution XUV as a cutoff-independent part. XUV includes power corrections ∼(ΛQCD2/Q2)n which are independent of renormalons. Using the integration-by-regions method, we observe that XUV coincides with the leading Wilson coefficient in OPE and also clarify that the power corrections originate from UV region. We examine scheme dependence of XUV 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 QQ, and R-ratio in e+e- collision.

本文言語English
論文番号114016
ジャーナルPhysical Review D
95
11
DOI
出版ステータスPublished - 2017 6 1

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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