Standard model loop contributions to the muon anomalous magnetic moment, a_μ≡(g_μ-2)/2, and their theoretical uncertainties are scrutinized. The status and implications of the recently reported 2.6 sigma experiment versus theory deviation a_μᵉˣᵖᵗ-a_μSM=426(165)×10^-11 are discussed. Possible explanations due to supersymmetric loop effects with mSUSY55_-8⁺¹⁶√tanβ GeV, radiative mass mechanisms at the 1--2 TeV scale and other ``new physics'' scenarios are examined.
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Czarnecki et al. (2001) studied this question.
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