Two-Component Fermion Theory

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Abstract
The relativistic generalization of Pauli's equation for the electron has recently motivated Feynman and Gell-Mann to propose a specific form of universal Fermi interaction. Particles satisfying this equation are studied from the viewpoint of their electromagnetic interaction. It is found that an anomalous magnetic moment similar to the Pauli moment violates the Hermiticity of the theory, and that only vector and axial vector interactions lead to simple two-component equations, even with parity conservation. Rules for calculation in quantum electrodynamics are developed which have definite advantages over the usual Dirac formulation.

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