@Article{Aguilar_etal2017,
author="Aguilar, A. C.
and Cardona, J. C.
and Ferreira, M. N.
and Papavassiliou, J.",
title="Non-Abelian Ball-Chiu vertex for arbitrary Euclidean momenta",
journal="Physical Review D",
year="2017",
publisher="Amer Physical Soc",
volume="96",
number="1",
pages="014029--29pp",
abstract="We determine the non-Abelian version of the four nontransverse form factors of the quark-gluon vertex, using exact expressions derived from the Slavnov-Taylor identity that this vertex satisfies. In addition to the quark and ghost propagators, a key ingredient of the present approach is the quark-ghost scattering kernel, which is computed within the one-loop dressed approximation. The vertex form factors obtained from this procedure are evaluated for arbitrary Euclidean momenta, and display features not captured by the well-known Ball-Chiu vertex, deduced from the Abelian (ghost-free) Ward identity. Particularly interesting in this analysis is the so-called soft-gluon limit, which, unlike other kinematic configurations considered, is especially sensitive to the approximations employed for the vertex entering in the quark-ghost scattering kernel, and may even be affected by a subtle numerical instability. As an elementary application of the results obtained, we evaluate and compare certain renormalization-point-independent combinations, which contribute to the interaction kernels appearing in the standard quark gap and Bethe-Salpeter equations. In doing so, even though all form factors of the quark-gluon vertex, and in particular the transverse ones which are unconstrained by our procedure, enter nontrivially in the aforementioned kernels, only the contribution of a single form factor, corresponding to the classical (tree-level) tensor, will be considered.",
optnote="WOS:000406540300002",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3232), last updated on Mon, 21 Aug 2017 15:43:52 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.96.014029",
opturl="http://arxiv.org/abs/1610.06158",
opturl="https://doi.org/10.1103/PhysRevD.96.014029",
archivePrefix="arXiv",
eprint="1610.06158",
language="English"
}