PT Journal
AU Aguilar, AC
   De Soto, F
   Ferreira, MN
   Papavassiliou, J
   Rodriguez-Quintero, J
TI Infrared facets of the three-gluon vertex
SO Physics Letters B
JI Phys. Lett. B
PY 2021
BP 136352
EP 7pp
VL 818
DI 10.1016/j.physletb.2021.136352
LA English
DE QCD; Three-gluon vertex; Lattice QCD; Schwinger-Dyson equations
AB We present novel lattice results for the form factors of the quenched three-gluon vertex of QCD, in two special kinematic configurations that depend on a single momentum scale. We consider three form factors, two associated with a classical tensor structure and one without tree-level counterpart, exhibiting markedly different infrared behaviors. Specifically, while the former display the typical suppression driven by a negative logarithmic singularity at the origin, the latter saturates at a small negative constant. These exceptional features are analyzed within the Schwinger-Dyson framework, with the aid of special relations obtained from the Slavnov-Taylor identities of the theory. The emerging picture of the underlying dynamics is thoroughly corroborated by the lattice results, both qualitatively as well as quantitatively.
ER