Volume 365 - alphas-2019: Workshop on precision measurements of the QCD coupling constant (ALPHAS2019) - $a_S$: Lattice OCD
$a_S$ determination from static QCD potential with renormalon subtraction
H. Takaura
Full text: pdf
Pre-published on: 2019 July 22
Published on: 2019 September 13
Abstract
In the current $α_s$ determinations based on lattice and perturbation theory, it is generally difficult to take a wide enough matching range. We avoid this problem by improvement of a theoretical calculation: we use the OPE with renormalon subtraction, which is an extended framework of perturbation theory. This allows us to take the matching range widely as $Λ_QCD^r$$\utilde{<} .0.6$, where relatively low energy scales are included. We obtain $α_s$ ($m_Z$) = 0.1179+0.0015−0.0014 from a reasonable fit for this wide range.
DOI: https://doi.org/10.22323/1.365.0025
Open Access