Improved Determination of $\alpha (M_{\mathrm{Z}}^2$) and the Anomalous Magnetic Moment of the Muon

Abstract

We reevaluate the hadronic contribution to the running of the QED fine structure constant \aqed at $s=M_{\mathrm{Z}}^2$. We use data from \ee\ annihilation and $\tau$ decays at low energy and at the $q\bar{q}$ thresholds, where resonances occur. Using so-called spectral moments and the Operator Product Expansion (OPE), it is shown that a reliable theoretical prediction of the hadronic production rate $R(s)$ is available at relatively low energies. Its application improves significantly the precision on the hadronic vacuum polarization contribution. We obtain \daqedhZ $=(277.8\pm 2.6)\times 10^{-4}$ yielding ${\alpha }^{-1}(M_{\mathrm{Z}}^2)=128.923\pm 0.036$. Inserting this value in a global electroweak fit using current experimental input, we constrain the mass of the Standard Model Higgs boson to be $M_{\mathrm{Higgs}}=129_{-62}^{+103}\mathrm{GeV}$. Analogously, we improve the precision of the hadronic contribution to the anomalous magnetic moment of the muon for which we obtain $a_{\mu }^{\mathrm{had}}=(695.1\pm 7.5)\times 10^{-10}$.

18 pages

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