Prediction of the anomalous magnetic moment of the nucleon from the nucleon anomaly

We construct the effective anomaly lagrangian involving nucleons and photons by using the current-current coupling method. The contribution of this lagrangian to the anomalous magnetic moment of nucleon is purely isovector. The anomalous magnetic moment of the proton, κP, can be calculated from this lagrangian and it is found to be κPTheor. = 1.77, which is in excellent agreement with the experimental value κPExp. = 1.79. While for the neutron, κNTheor. = −2.58 as compared to κNExp. = −1.91, is less satisfactory, but the sign is correct.