Quark-gluon vertex model and lattice-QCD data

Details Quark-gluon vertex model and lattice-QCD data Quark-gluon vertex model and lattice-QCD data

2004-07-14

arxiv.org/abs/hep-ph/0407163v1

Phys.Rev. D70 (2004) 094039

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures

Scientific paper

10.1103/PhysRevD.70.094039

A model for the dressed quark-gluon vertex, at zero gluon momentum, is formed from a nonperturbative extension of the two Feynman diagrams that contribute at 1-loop in perturbation theory. The required input is an existing ladder-rainbow model Bethe-Salpeter kernel from an approach based on the Dyson-Schwinger equations; no new parameters are introduced. The model includes an Ansatz for the triple-gluon vertex. Two of the three vertex amplitudes from the model provide a point-wise description of the recent quenched lattice-QCD data. An estimate of the effects of quenching is made.

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