%0 Journal Article
%T Non-contact interactions and the hadronic light-by-light contribution to the muon g-2
%A Williams
%A Richard
%A Fischer
%A Christian S.
%A Goecke
%A Tobias
%J High Energy Physics - Phenomenology
%D 2013
%I 
%X We summarise recent results for the quark loop part of the light-by-light scattering contribution to the muons anomalous magnetic moment. In particular we focus on the impact of a momentum dependent quark and quark-photon vertex. We compare the Dyson-Schwinger description with that of the extended Nambu--Jona-Lasinio model (ENJL) and find important quantitative differences. In particular the transverse parts of the quark-photon-vertex, which serve as a dynamical extension of simple vector meson dominance models, do not yield the large suppression as found in the ENJL model.
%U http://arxiv.org/abs/1304.4347