Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-16
Phys.Rev. D67 (2003) 073006; Erratum-ibid. D73 (2006) 119901
Physics
High Energy Physics
High Energy Physics - Phenomenology
Revtex, 35 pages, 9 figures. Minor corrections in a few equations, note on comparison of OPE analyses is added
Scientific paper
10.1103/PhysRevD.67.073006
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.
Czarnecki Andrzej
Marciano William J.
Vainshtein Arkady
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