Abstract
The hadronic light-by-light scattering contribution to muon \$g-2\$ is examined
based on the low energy effective theories of QCD, the Nambu-Jona-Lasinio model
and hidden local symmetry approach, supplemented by a general information
concerning the asymptotic behavior of QCD.
Our result is \$- 52 10^-11\$ with an uncertainty of \$18 \times
10^-11\$, which includes our best estimate of model dependence. This is within
the expected measurement uncertainty of \$4010^-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\$.
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