HADRONIC LIGHT-BY-LIGHT SCATTERING EFFECT ON MUON G-2

The hadronic light-by-light scattering contribution to muon g - 2 is examined using low energy effective theories of QCD, the Nambu-Jona-Lasinio model, and hidden local chiral symmetry, as guides. Our result is -36 x 10(-11) with an uncertainty of +/-16 x 10(-11), which includes our best estimate of model dependence. This is within the expected measurement uncertainty of 40 x 10(-11) in the forthcoming experiment at Brookhaven National Laboratory. Our result removes one of the main theoretical obstacles in verifying the existence of the weak contribution to the muon g - 2.