Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment revisited

Details Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment revisited Hadronic light-by-light scattering contribution to the muon anomalous magnetic moment revisited

2003-12-16

arxiv.org/abs/hep-ph/0312226v1

Phys.Rev. D70 (2004) 113006

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 2 figures

Scientific paper

10.1103/PhysRevD.70.113006

We discuss hadronic light-by-light scattering contribution to the muon anomalous magnetic moment a_\mu^{\rm lbl}, paying particular attention to the consistent matching between the short- and the long-distance behavior of the light-by-light scattering amplitude. We argue that the short-distance QCD imposes strong constraints on this amplitude overlooked in previous analyses. We find that accounting for these constraints leads to approximately 50 per cent increase in the central value of a_\mu^{\rm lbl}, compared to existing estimates. The hadronic light-by-light scattering contribution becomes a_\mu^{\rm lbl}=136(25) \times 10^{-11}, thereby shifting the Standard Model prediction closer to the experimental value.

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