2021/09/29 by Maximilian Ammer, Ammer, Maximilian, Stephan Dürr +1
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Superconducting Materials and Applications
paper · pdf · doi:10.48550/arxiv.2109.14562
openalex publication_date 2021/09/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The one-loop determination of the coefficient cSW of the Wilson quark action has been useful to push the leading cut-off effects for on-shell quantities to O(α2 a) and, in conjunction with non-perturbative determinations of cSW, to O(a2), as long as no link-smearing is employed. These days it is common practice to include some overall link-smearing into the definition of the fermion action. Unfortunately, in this situation only the tree-level value cSW(0)=1 is known, and cut-off effects start at O(αa). We present some general techniques for calculating one loop quantities in lattice perturbation theory which continue to be useful for smeared-link fermion actions. Specifically, we discuss the application to the 1-loop improvement coefficient cSW(1) for overall stout-smeared Wilson fermions.