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Hadronic Light-by-Light Contribution to Muon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">g</mml:mi><mml:mi /><mml:mo>โˆ’</mml:mo><mml:mi /><mml:mn>2</mml:mn></mml:math>in Chiral Perturbation Theory

Hadronic Light-by-Light Contribution to Muon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">g</mml:mi><mml:mi /><mml:mo>โˆ’</mml:mo><mml:mi /><mml:mn>2</mml:mn></mml:math>in Chiral Perturbation Theory

We compute the hadronic light-by-light scattering contributions to the muon anomalous magnetic moment, a(LL)(mu)(had), in chiral perturbation theory that are enhanced by large logarithms and a factor of N(C). They depend on a low-energy constant constrained by eta-->mu(+) mu(-) and pi(0)-->e(+)e(-) branching ratios. However, the dependence of a(LL)(mu)(had) on nonlogarithmically โ€ฆ