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

2001/11/30 by M. Knecht, A. Nyffeler, M. Perrottet +1
Physics and Astronomy · #hep-ph #hep-ex

paper · pdf · doi:10.1103/physrevlett.88.071802

published as Phys.Rev.Lett.88:071802,2002 · 4 pages, 1 figure. v2: published version

arxiv created 2002/02/18 · arxiv updated 2009/11/30

Abstract

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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