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

2013/04/16 by Richard Williams, Christian S. Fischer, Williams, Richard +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th

paper · pdf · doi:10.48550/arxiv.1304.4347

Proceedings of Excited QCD 2013, Bjelasnica Mountain, Sarajevo, February 3rd-9th. 6 pages

arxiv created 2013/04/16 · openalex publication_date 2013/04/16 · arxiv updated 2013/04/17 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/28

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.

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