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Non-contact interactions and the hadronic light-by-light contribution to the muon g-2

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.

preprint2013arXivOpen access
Richard WilliamsChristian S. FischerTobias Goecke
hep-phnucl-th
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Richard WilliamsChristian S. FischerTobias Goecke

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