Abstract
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, κ P , can be calculated from this lagrangian and it is found to be κ P Theor. = 1.77, which is in excellent agreement with the experimental value κ P Exp. = 1.79. While for the neutron, κ N Theor. = −2.58 as compared to κ N Exp. = −1.91, is less satisfactory, but the sign is correct.
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