Hadronic light-by-light scattering contribution to the muon g-2: an effective field theory approach

Details Hadronic light-by-light scattering contribution to the muon g-2: an effective field theory approach Hadronic light-by-light scattering contribution to the muon g-2: an effective field theory approach

2001-11-06

arxiv.org/abs/hep-ph/0111059v2

Phys.Rev.Lett.88:071802,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 1 figure. v2: published version

Scientific paper

10.1103/PhysRevLett.88.071802

The hadronic light-by-light contribution to a_{mu}, the anomalous magnetic moment of the muon, is discussed from the point of view of an effective low-energy theory. As an application, the coefficient of the leading logarithm arising from the two-loop graphs involving two anomalous vertices is computed, and found to be positive. This corresponds to a positive sign for the pion-pole contribution to the hadronic light-by-light correction to a_{mu}, and to a sizeable reduction of the discrepancy between the present experimental value of a_{mu} and its theoretical counterpart in the standard model.

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