Quark-gluon vertex in a momentum subtraction scheme
classification
✦ hep-lat
hep-ph
keywords
momentumquark-gluonschemesubtractionvertexactionasymmetriccalculated
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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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