The dimension-two gluon condensate, the ghost-gluon vertex and the Taylor theorem

Details The dimension-two gluon condensate, the ghost-gluon vertex and the Taylor theorem The dimension-two gluon condensate, the ghost-gluon vertex and the Taylor theorem

2011-12-20

arxiv.org/abs/1112.4749v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Oral contribution to QCDTNT-II (Trento, 2011)

Scientific paper

We study the genuine non-perturbative corrections to the Landau gauge ghost-gluon vertex in terms of the non-vanishing dimension-two gluon condensate, and prove these corrections to give account of current SU(2) lattice data for the vertex with different kinematical configurations in the domain of intermediate momenta, roughly above 2-3 GeV. Based on this OPE analysis, we also present a simple model for the vertex, in acceptable agreement with the lattice data also in the IR domain. The necessity of a non-vanishing dimension-two gluon condensate will be also investigated through the analysis of the running coupling defined by the ghost-gluon vertex in Taylor kinematics.

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