Probing nucleons with photons at the quark level

Abstract

The description of electromagnetic interactions with hadrons from the quark level requires knowledge of the underlying quark-gluon ingredients. I discuss some properties of the quark-photon vertex and quark Compton vertex, along with the role of electromagnetic gauge invariance and vector-meson dominance. A simple parametrization for the quark-photon vertex is given.

Comments: 7 pages, 4 figures, 1 table. Presented at the Workshop 'Excited QCD 2014', Bjelasnica Mountain, Sarajevo, Bosnia-Herzegovina, February 2-8, 2014