Wave equation for a composite nucleon

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Abstract
A two-component Pauli equation for a composite model of the nucleon is derived using a relativistically covariant quark model. Scalar-isoscalar, vector-isoscalar, vector-isovector, and electromagnetic external potentials are considered. For the vector fields we find anomalous ‘‘magnetic moments,’’ which are simply related to the corresponding electromagnetic κ. The Dirac equation, even if supplemented by anomalous magnetic moments, is found to fail beginning with the Darwin term. However, in Dirac phenomenology, the low-order errors can be compensated by the strengths and functional shapes of the assumed potentials.