Аннотация
We calculate the hadronic light-by-light contributions to the muon \$g-2\$. We
use both \$1/N\_c\$ and chiral counting to organize the calculation. Then we
calculate the leading and next-to-leading order in the \$1/N\_c\$ expansion low
energy contributions using the Extended Nambu--Jona-Lasinio model as hadronic
model. We do that to all orders in the external momenta and quark masses
expansion. Although the hadronic light-by-light contributions to muon \$g-2\$ are
not saturated by these low energy contributions we estimate them
conservatively. A detailed analysis of the different hadronic light-by-light
contributions to muon \$g-2\$ is done. The dominant contribution is the twice
anomalous pseudoscalar exchange diagram. The final result we get is \$a\_\mu^\rm
light-by-light= (-9.2\pm3.2 ) 10^-10\$. This is between two and three
times the expected experimental uncertainty at the forthcoming BNL muon \$g-2\$
experiment.
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