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arXiv · 1610.06158

Non-Abelian Ball-Chiu vertex for arbitrary Euclidean momenta

A. C. Aguilar·J. C. Cardona·M. N. Ferreira·J. Papavassiliou
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Abstract

We determine the non-Abelian version of the four longitudinal 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. The potential phenomenological impact of these results is evaluated through the study of special renormalization-point-independent combinations, which quantify the strength of the interaction kernels appearing in the standard quark gap and Bethe-Salpeter equations.

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A. C. Aguilar, J. C. Cardona, M. N. Ferreira, J. Papavassiliou. 2016-10-19. Non-Abelian Ball-Chiu vertex for arbitrary Euclidean momenta. https://doi.org/10.1103/physrevd.96.014029

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