QCD improved determination of the hadronic contribution to the anomalous magnetic moment of the muon
Abstract
We present the results of a new evaluation of the anomalous magnetic moment amu=(gmu-2)/2 of the muon where the role of input data needed in the evaluation is lowered in the interval between 1.2 and 3.0 GeV below charm threshold. This is achieved by decreasing the size of the weight function in the dispersion integral over the experimental ratio R(s) by subtracting a polynomial from the weight function which mimics its energy dependence in that given energy interval. In order to compensate for this subtraction, the same polynomial weight integral is added again but is now evaluated on a circular contour in the complex plane using QCD and global duality. For the hadronic contribution to the shift in the anomalous magnetic moment of the muon we obtain amuhad(LO) = (701.3 +/- 6.4) x 10-10 at leading order in the electromagnetic coupling. In addition, using the same procedure, we recalculate the next-to-leading contribution amuhad(NLO) = (-10.3 +/- 0.2) x 10-10. Including QED, electroweak, and light-by-light contribution, we obtain a value amu = (11 659 185.6 +/- 6.4had +/- 3.5LBL +/- 0.4QED+EW) x 10-10.
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