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hep-th2025
The QED photon-fermion vertex from its Dyson-Schwinger equation in 4D: the full vertex, the transverse form factors and the perturbative solution
Orlando Oliveira
We investigate the Dyson-Schwinger equation for the photon-fermion one-particle irreducible vertex in QED in linear covariant gauges. The longitudinal component of this vertex is d…
hep-lat2025
The four-gluon vertex from lattice QCD
Manuel Colaço, Orlando Oliveira, Paulo J. Silva
The four-gluon one-particle irreducible Green function contributes to various quantities with phenomenological relevance. An example where the four-gluon plays a role is the determ…