The role of momentum dependent dressing functions and vector meson dominance in hadronic light-by-light contributions to the muon g-2

Abstract

We present a refined calculation of the quark-loop contribution to hadronic light-by-light scatter- ing that focuses upon the impact of the transverse components of the quark-photon vertex. These structures are compared and contrasted with those found within the extended NJL-models. We discuss similarities and differences between the two approaches and further clarify the important role of momentum dependent dressing functions. As expected we find that the transverse structures of the quark-photon vertex lead to a suppression of the quark-loop contribution to the anomalous magnetic moment of the muon. However, we find evidence that this suppression is overestimated within models with simple approximations for the quark-photon interaction.

13 pages, 5 figures, v2: typos corrected, references added, version submitted to PRD

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Cited by in corpus (6)

• Baryons as relativistic three-quark bound states
• Kaon-box contribution to the anomalous magnetic moment of the muon
• The light-by-light contribution to the muon anomalous magnetic moment from the axial-vector mesons exchanges within the nonlocal quark model
• Soft gluon fields and anomalous magnetic moment of muon
• Timelike form factor for the anomalous process ${\gamma }^{\ast }\pi \to \pi \pi$
• The role of vector meson dominance and running masses in the hadronic contributions to the muon $g-2$