Hi could someone please explain the story (if there is one) about the Dirac equation with an anomalous magnetic moment term, I have seen this in several old papers but it never seems to be mentioned in text books. Was this an old confusion in formulating QFT. In this context I believe the Dirac equaiton with pauli term takes on the following form:(adsbygoogle = window.adsbygoogle || []).push({});

[itex] -i\gamma^\mu(\partial_\mu-ieA_\mu)\psi + m\psi - (\frac 12 g-1)\frac{i e}{2m}F_{\mu\nu} S^{\mu\nu}\psi = 0[/itex]

where [itex]S^{\mu\nu}[/itex] are the generators of SL(2,C) and [itex]F_{\mu\nu}[/itex] is the electromagnetic tensor. I've never seen this extra term could you please tell me what it represents and if it is needed why

thanks in advanced

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# The Dirac equation with anomalous magnetic moment term

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