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arxiv: 1409.8620 · v3 · submitted 2014-09-30 · ✦ hep-ph

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Insights into the quark-gluon vertex from lattice QCD and meson spectroscopy

E. Rojas , B. El-Bennich , J.P.B.C. de Melo , M.Ali Paracha
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classification ✦ hep-ph
keywords interactionmodelsquark-gluonvertexapproximationbeyondbroadclearly
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By comparing successful quark-gluon vertex interaction models with the corresponding interaction extracted from lattice-QCD data on the quark's propagator, we identify common qualitative features which could be important to tune future interaction models beyond the rainbow ladder approximation. Clearly, a quantitative comparison is conceptually not simple, but qualitatively the results suggest that a realistic interaction should be relatively broad with a strong support at about $0.4-0.6$~GeV and infrared-finite.

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    The transverse quark-gluon vertex in Landau gauge QCD shows weak but non-negligible angular dependence with no planar degeneracy; the dynamically generated tensor coupling is the core driver of dynamical chiral symmet...