We review the possible contributions to the muon g-factor anomaly, α_μ≡1/2(g_μ-2) which are potentially significant for a comparison between theory and experiment at present. This includes purely quantum electrodynamic (QED) perturbation theory effects up to eighth order; hadronic effects at fourth and sixth order; and weak interaction effects. From these sources we get a total theoretical contribution α_μ(theory)=(1 165 920.6±12.9)×10^-9, to be compared with the latest CERN experimental result (Bailey et al., 1975), α_μ(experiment)=1 165 895±27)×10^-9.
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Calmet et al. (1977) studied this question.
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