Non-contact interactions and the hadronic light-by-light contribution to the muon g-2
High Energy Physics - Phenomenology
2013-04-17 v1 Nuclear Theory
Abstract
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.
Keywords
Cite
@article{arxiv.1304.4347,
title = {Non-contact interactions and the hadronic light-by-light contribution to the muon g-2},
author = {Richard Williams and Christian S. Fischer and Tobias Goecke},
journal= {arXiv preprint arXiv:1304.4347},
year = {2013}
}
Comments
Proceedings of Excited QCD 2013, Bjelasnica Mountain, Sarajevo, February 3rd-9th. 6 pages