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Abstract
A discussion is given by Lagrangian descriptions of a relativistic spinning particle in an external gauge field. We present a Lagrangian formalism which is free from unphysical modes in free field regions, and which leads to the Bargmann-Michel-Telegdi equation in weak, homogeneous fields. A dynamical description of a massless particle with spin as well as colour is commented upon, and an instability is indicated in external gauge fields. It is pointed out that a supersymmetric point particle cannot have an anomalous magnetic moment.
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