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

Goecke T.; Fischer C.S.; Williams R.

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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 scattering 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 Nambu-Jona-Lasinio 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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《Physical review, D. Particles, fields, gravitation, and cosmology》 |2013年第3期|034013-1-034013-13|共13页
作者
Goecke T.; Fischer C.S.; Williams R.;
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Institut für Theoretische Physik, Universit?t Giessen, 35392 Giessen, Germany;

Institut für Physik, Karl-Franzens-Universit?t Graz, Universit?tsplatz 5, 8010 Graz, Austria;

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中图分类粒子物理学;
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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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