We study the nonperturbative structure of the quark-photon vertex in Landau gauge. To this end, we utilize lattice QCD data for the vector current for two mass-degenerate quark flavours and extract all longitudinal and transverse form factors of the underlying vertex for two off-shell kinematics. The momentum dependence of the form factors is compared to the solution of the inhomogeneous Bethe-Salpeter equation for the vertex in the rainbow-ladder approximation. Differences but also similarities are seen between our lattice and the truncated continuum results.
@article{arxiv.1812.11131,
title = {Quark-photon vertex from lattice QCD in Landau gauge},
author = {Milena Leutnant and André Sternbeck},
journal= {arXiv preprint arXiv:1812.11131},
year = {2019}
}
Comments
8 pages, 5 figures. Talk presented at the Quark Confinement and the Hadron Spectrum XIII conference (Confinement 2018), Maynooth, Ireland, August 2018