QCD improved determination of the hadronic contribution to the anomalous magnetic moment of the muon

Details QCD improved determination of the hadronic contribution to the anomalous magnetic moment of the muon QCD improved determination of the hadronic contribution to the anomalous magnetic moment of the muon

2003-09-19

arxiv.org/abs/hep-ph/0309226v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages in LaTeX, including 4 Postscript figures

Scientific paper

We present the results of a new evaluation of the anomalous magnetic moment a_mu=(g_mu-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 a_mu^had(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 a_mu^had(NLO) = (-10.3 +/- 0.2) x 10^-10. Including QED, electroweak, and light-by-light contribution, we obtain a value a_mu = (11 659 185.6 +/- 6.4_had +/- 3.5_LBL +/- 0.4_QED+EW) x 10^-10.

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