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We present a reliable nonperturbative calculation of the QCD correction, atleading order in the electromagnetic coupling, to the anomalous magnetic momentof the electron, muon, and tau leptons using two-flavor lattice QCD. We usemultiple lattice spacings, multiple volumes, and a broad range of quark massesto control the continuum, infinite-volume, and chiral limits. We examine theimpact of the commonly ignored disconnected diagrams and introduce amodification to the previously used method that results in a well-controlledlattice calculation. We obtain 1.513(43) 10^(-12), 5.72(16) 10^(-8), and2.650(54) 10^(-6) for the leading-order two-flavor QCD correction to theanomalous magnetic moment of the electron, muon, and tau, respectively, eachaccurate to better than 3%.

Two-flavor QCD correction to lepton magnetic moments at leading-order in the electromagnetic coupling