Abstract
QED, Hadronic, and Electroweak Standard Model contributions to the muon
anomalous magnetic moment, a\_mu = (g\_mu-2)/2, and their theoretical
uncertainties are scrutinized. The status and implications of the recently
reported 2.6 sigma experiment vs.theory deviation a\_mu^exp-a\_mu^SM =
426(165) times 10^-11 are discussed. Possible explanations due to
supersymmetric loop effects with m\_SUSY 55 sqrttan beta GeV,
radiative mass mechanisms at the 1--2 TeV scale and other ``New Physics''
scenarios are examined.
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