A fresh look at hadronic light-by-light scattering in the muon g - 2 with the Dyson-Schwinger approach
Institut für Theoretische Physik, Universität Giessen, 35392, Giessen, Germany
2 Gesellschaft für Schwerionenforschung mbH, Planckstr. 1, D-64291, Darmstadt, Germany
3 Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289, Darmstadt, Germany
Accepted: 4 February 2011
Published online: 24 February 2011
Using the Dyson-Schwinger and Bethe-Salpeter equations, we calculate the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon , using a phenomenological model for the gluon and quark-gluon interaction. We find for meson exchange, and for the quark loop. The former is commensurate with past calculations; the latter much larger due to dressing effects. This leads to a revised estimate of , reducing the difference between theory and experiment to ≃ 1.9 .
© SIF, Springer-Verlag Berlin Heidelberg, 2011