Charm quark effects on the strong coupling extracted from the static force

Salvatore Calì; Francesco Knechtli; Tomasz Korzec; Haralambos Panagopoulos

doi:10.1051/epjconf/201817510002

Proceedings

Open Access

EPJ Web of Conferences 175, 10002 (2018)
https://doi.org/10.1051/epjconf/201817510002

Charm quark effects on the strong coupling extracted from the static force^*

Salvatore Calì^,2^**, Francesco Knechtli², Tomasz Korzec² and Haralambos Panagopoulos¹

¹ University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
² University of Wuppertal, Gauβstr. 20, 42119 Wuppertal, Germany

^** Speaker, e-mail: scali@uni-wuppertal.de

Published online: 26 March 2018

Abstract

We compute the fermionic contribution to the strong coupling α_qq extracted from the static force in Lattice QCD up to order g⁴ in perturbation theory. This allows us to subtract the leading fermionic lattice artifacts from recent determinations of α_qq produced in simulations of two dynamical charm quarks.

Moreover, by using a suitable parametrization of the β_qq-function, we can evaluate the charm loop effects on α_qq in the continuum limit.

Talk given at the 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spain. The title of the talk at the conference was “Computation of α_qq in QCD (N_f = 2) using Lattice Perturbation Theory”.

© The Authors, published by EDP Sciences, 2018

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).