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The role of momentum dependent dressing functions and vector meson dominance in hadronic light-by-light contributions to the muon g-2
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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.
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The light-by-light contribution to the muon g-2 within the nonlocal chiral quark model with vector and axial-vector mesons
The nonlocal chiral quark model with vector and axial-vector mesons yields a hadronic light-by-light contribution to the muon g-2 of (157±10.6)x10^-11, with vector-meson photon dressing contributing only a few units.
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