https://doi.org/10.1140/epja/i2011-11028-1
Letter
A fresh look at hadronic light-by-light scattering in the muon g - 2 with the Dyson-Schwinger approach
1
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
Received:
11
January
2011
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
