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Analysis of the Hadronic Light-by-Light Contributions to the Muon \$g-2\$

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Nuclear Physics B, 474 (2): 379--417 (28.03.1996)
DOI: 10.1016/0550-3213(96)00288-x

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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