arXiv:hep-lat/0109027·v1·High Energy Physics — Lattice
Quark-gluon vertex in a momentum subtraction scheme
J.Skullerud🇩🇪 · A.Kizilersu🇦🇺 · A.G.Williams🇦🇺
Abstract
We compute the quark-gluon vertex in quenched QCD, in the Landau gauge using an off-shell mean-field O(a)-improved fermion action. The running coupling is calculated in an `asymmetric' momentum subtraction scheme (MOM~). We obtain a crude estimate for Lambda_MSbar=170+/-65 MeV, which is considerably lower than other determinations of this quantity. However, substantial systematic errors remain.
Comments: Lattice2001(improvement); 3 pages, 3 figures