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This brief note is devoted to a study of genuine non-perturbative correctionsto the Landau gauge ghost-gluon vertex in terms of the non-vanishingdimension-two gluon condensate. We pay special attention to the kinematicallimit which the bare vertex takes for its tree-level expression at anyperturbative order, according to the well-known Taylor theorem. Based on ourOPE analysis, we also present a simple model for the vertex, in acceptableagreement with lattice data.

On the leading OPE corrections to the ghost-gluon vertex and the Taylor theorem