The Wilson coefficient corresponding to the gluon-field strength G_μν{G}^{{μ}{ν}}$ is evaluated for the nucleon current correlation function in the presence of a static external electromagnetic field, using a regulator mass {Λ} to separate the high-momentum part of the Feynman diagrams. The magnetic-moment sum rules are analyzed by two different methods and the sensitivity of the results to variations in {Λ} are discussed.
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Wilson et al. (1987) studied this question.
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