Phys. Rev. Lett. 89, 041601 (2002) [4 pages]Hadronic Light-by-Light Contribution to Muon g-2 in Chiral Perturbation TheoryReceived 4 February 2002; revised 6 March 2002; published 2 July 2002 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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.041601
DOI:
10.1103/PhysRevLett.89.041601
PACS:
13.40.Em, 12.39.Fe
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