Speaker
Description
We report novel lattice QCD results for the general kinematics three-gluon vertex, focusing in the determination of the three gluon coupling in MOM scheme, $\alpha_{3g}$, for a wide variety of vertex kinematics. By employing the \textit{planar-degeneracy}, that states that the deep IR running of the vertex does not depend on the particularities of the kinematical configuration chosen to compute it, we propose a definition of the renormalized coupling that exploits this phenomenon.
We furthermore compute for the first time the tree-level component of the four-gluon vertex in non-collinear kinematics, which also exhibits \textit{planar-degeneracy}, and compute the MOM-scheme coupling $\alpha_{4g}$ following the same approach than in the three-gluon case. Strikingly, $\alpha_{3g}$ and $\alpha_{4g}$ seem to coincide with each other in the deep IR, pointing towards the idea of an universal coupling for the gluonic sector of QCD at low momenta.
