Aguilar, A. C.Soto Borrero, Feliciano Carlos deFerreira, M. N.Papavassiliou, J.Pinto Gómez, F.Rodríguez Quintero, JoséSantos, L.R.2024-11-262024-11-262024-11Aguilar, A. C., De Soto, F., Ferreira, M. N., Papavassiliou, J., Pinto-Gómez, F., Rodríguez-Quintero, J., & Santos, L. R. (2024). Nonperturbative four-gluon vertex in soft kinematics. In Physics Letters B (Vol. 858, p. 139065). Elsevier BV. https://doi.org/10.1016/j.physletb.2024.1390650370-26931873-2445 (electrónico)https://hdl.handle.net/10272/24514We 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 agreementengAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Schwinger-Dyson equationsLattice QCDFour-gluon vertexQuantum chromodynamicsjournal article10.1016/j.physletb.2024.139065open access22 Física