Quark-gluon vertex in a momentum subtraction scheme
J.Skullerud, A.Kizilersu, A.G.Williams
TL;DR
This paper calculates the quark-gluon vertex in quenched QCD using a momentum subtraction scheme, providing an estimate for Lambda_MSbar with notable systematic uncertainties.
Contribution
It presents the first computation of the quark-gluon vertex in quenched QCD within an off-shell MOM scheme, highlighting the challenges in precise determination.
Findings
Estimated Lambda_MSbar = 170 ± 65 MeV
Lower than other determinations of Lambda_MSbar
Significant systematic errors acknowledged
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.
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