Perturbative determination of O ( a m ) improvement on the QCD running coupling
Year: 2025
Type: article
Abstract: We present the perturbative results of the discretization errors proportional to the quark mass [ O ( a m ) ] on the QCD running coupling within lattice perturbation theory. Our analysis involves calculating the two-loop renormalization factor Z g using improved lattice actions for the S U ( N c ) gauge group and N f multiplets of fermions with a finite quark mass. We employ the background field method to compute Z g , by calculating quantum corrections on both the background and quantum gluon propagator, respecting the O ( a ) improvement. This allows us to evaluate the perturbative O ( a m ) lattice errors which affect the determination of the running coupling. Eliminating these O ( a m ) effects is crucial for the nonperturbative studies of precision determinations of the strong coupling constant using lattice field theory.
DOI: 10.1103/yyvs-6q5v
Authors: M. Costa, D. Gavriel, H. Panagopoulos, G. Spanoudes
Institutions: University of Cyprus, Rinnoco Ltd (Cyprus)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4415292230