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Refinements in electroweak contributions to the muon anomalous magnetic moment

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arxiv hep-ph/0212229 v3 pith:4JRMFGT7 submitted 2002-12-16 hep-ph

Refinements in electroweak contributions to the muon anomalous magnetic moment

classification hep-ph
keywords contributionselectroweakloopanomalouslogsmagneticmomentmuon
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Effects of strong interactions on the two loop electroweak radiative corrections to the muon anomalous magnetic moment, $a_\mu=(g_\mu-2)/2$, are examined. Short-distance logs are shown to be unaffected. Computation of long-distance contributions is improved by use of an effective field theory approach that preserves the chiral properties of QCD and accounts for constraints from the operator product expansion. Small, previously neglected, two loop contributions, suppressed by a $1-4\sin^2\theta_W$ factor, are computed and the complete three loop leading short-distance logs are reevaluated. These refinements lead to a reduction in uncertainties and a slight shift in the total electroweak contribution to $a_\mu^{\rm EW} = 154(1)(2)\times 10^{-11}$ where the first error corresponds to hadronic uncertainties and the second is primarily due to the allowed Higgs mass range.

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