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Published July 22, 2002 | Published
Journal Article Open

Hadronic Light-by-Light Contribution to Muon g - 2 in Chiral Perturbation Theory


We compute the hadronic light-by-light scattering contributions to the muon anomalous magnetic moment, aμLL(had), in chiral perturbation theory that are enhanced by large logarithms and a factor of NC. They depend on a low-energy constant constrained by η→μ+μ- and π0→e+e- branching ratios. However, the dependence of aμLL(had) on nonlogarithmically enhanced effects cannot be constrained except through the measurement of the anomalous moment itself.

Additional Information

© 2002 The American Physical Society Received 4 February 2002; revised 6 March 2002; published 2 July 2002 We thank M. Knecht, A. Nyffeler, M. Perrottet, and E. de Rafael, for pointing out terms omitted in a previous version of the manuscript. We also thank D. Hertzog, A. Kurylov, and W. Marciano for useful discussions. This work was supported in part by the U.S. Department of Energy Contracts No. DE-FG02-00ER41146 and No. DEFG03-92ER40701 and National Science Foundation Grant No. PHY-0071856.

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