QUANTIZATION OF A SPINNING PARTICLE WITH ANOMALOUS MAGNETIC-MOMENT

A generalization of the pseudoclassical action of a spinning particle in the presence of an anomalous magnetic moment is given. The leading considerations, to write the action, are gotten from the path-integral representation for the causal Green function of the generalized (by Pauli) Dirac equation for the particle with anomalous magnetic moment in an external electromagnetic field. The action can be written in reparametrization and supergauge-invariant form. Both operator (Dirac) and path-integral (BFV) quantization are discussed. The first one leads to the Dirac-Pauli equation, whereas the second one gives the corresponding propagator. One of the non-trivial points in this case is that both quantization schemes demand, for consistency, that we take into account an operator ordering problem.