TY  - JOUR
AU  - Aguilar, A. C.
AU  - De Soto, F.
AU  - Ferreira, M. N.
AU  - Papavassiliou, J.
AU  - Pinto-Gomez, F.
AU  - Rodríguez-Quintero, J.
AU  - Santos, L. R.
PY  - 2024
DA  - 2024//
TI  - Nonperturbative four-gluon vertex in soft kinematics
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 139065
EP  - 7pp
VL  - 858
PB  - Elsevier
KW  - Quantum chromodynamics
KW  - Four-gluon vertex
KW  - Lattice QCD
KW  - Schwinger-Dyson equations
AB  - 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.
SN  - 0370-2693
UR  - https://arxiv.org/abs/2408.06135
UR  - https://doi.org/10.1016/j.physletb.2024.139065
DO  - 10.1016/j.physletb.2024.139065
LA  - English
N1  - WOS:001336250000001
ID  - Aguilar_etal2024
ER  -