%0 Journal Article
%A Aguilar, A.C.
%A de Soto, Feliciano
%A Ferreira, M.N.
%A Papavassiliou, J.
%A Pinto-Gómez, F.
%A Rodríguez-Quintero, J.
%A Santos, L.R.
%T Nonperturbative four-gluon vertex in soft kinematics
%D 2024
%U https://hdl.handle.net/10433/22787
%X We present a nonperturbative study of the form factor associated with the projection of the full four-gluon vertex on its classical tensor, for a set of kinematics with one vanishing and three arbitrary external momenta. The treatment is based on the Schwinger-Dyson equation governing this vertex, and a large-volume lattice simulation, involving ten thousand gauge field configurations. The key hypothesis employed in both approaches is the “planar degeneracy”, which classifies diverse configurations by means of a single variable, thus enabling their meaningful “averaging”. The results of both approaches show notable agreement, revealing a considerable suppression of the averaged form factor in the infrared. The deviations from the exact planar degeneracy are discussed in detail, and a supplementary variable is used to achieve a more accurate description. The effective charge defined through this special form factor is computed within both approaches, and the results obtained are in excellent agreement.
%K Quantum chromodynamics
%K Four-gluon vertex
%K Lattice QCD
%K Schwinger-Dyson equations
%~