Monday, October 8, 2012

1210.1759 (Tobias Goecke et al.)

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

Tobias Goecke, Christian S. Fischer, Richard Williams
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.
View original: http://arxiv.org/abs/1210.1759

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