Summary
A re-examination of the semiclassical approach of the relativistic electron indicates a possible variation of its helicity for electric and magnetic static fields applied along its global motion due to zitterbewegung effects, proportional to the anomalous part of the magnetic moment.
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Della Selva, A., Magnin, J. & Masperi, L. Bargmann-Michel-Telegdi equation and one-particle relativistic approach. Nuov Cim B 111, 855–862 (1996). https://doi.org/10.1007/BF02749016
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DOI: https://doi.org/10.1007/BF02749016