Hadronic light-by-light scattering in the muon g-2: a Dyson-Schwinger equation approach

2010/12/17 by Tobias Goecke, Christian S. Fischer, Richard Williams · 1 voice
Physics and Astronomy · #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevd.83.094006

published as Phys.Rev.D83:094006,2011 · 14 pages, 16 figures, 2 tables. Version to appear in Phys. Rev. D

arxiv published 2010/12/17 · arxiv created 2011/04/15 · arxiv updated 2011/04/15

Abstract

We determine the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon using the framework of Dyson-Schwinger and Bethe-Salpeter equations of QCD. Our result for the pseudoscalar (π⁰, η, η') meson exchange diagram is commensurate with previous calculations. In our calculation of the quark loop contribution we improve previous approaches by implementing constraints due to gauge invariance. As a consequence, our value a_μ^\textrmLBL;quarkloop = (136 ± 59)× 10^-11 is significantly larger. Taken at face value, this then leads to a revised estimate of the total a_μ=116 591 891.0(105.0)× 10^-11.

Discussions

• Maybe there is no new physics signal in the g-2 of the muon after all. See http://arxiv.org/abs/1012.3886 for a new calculation [bsky, 0 points, 0 comments]

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