Towards lattice-assisted hadron physics calculations based on QCD n-point functions

Understand

We present preliminary lattice results for the nonperturbative tensor structure of the vector and axial-vector quark-antiquark vertices in QCD.

• Our lattice calculations are for $N_f=2$ mass-degenerate Wilson fermion flavors whose quark mass values include an almost physical one.
• We compare our lattice results with the corresponding continuum solutions of the inhomogeneous Bethe-Salpeter equations in a rainbow-ladder truncation.
• We find similarities in the momentum dependencies of the form factors but also clear deviations at low momentum.