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# Improved predictions for g-2 of the muon and \alpha_{\rm QED}(M_Z^2)

Hagiwara, K.; Martin, A.D.; Nomura, Daisuke and Teubner, T. (2007) Improved predictions for g-2 of the muon and \alpha_{\rm QED}(M_Z^2). Physics Letters B, 649 (2-3). pp. 173-179. ISSN 0370-2693

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## Abstract

We update the Standard Model predictions of the anomalous magnetic moment of the muon, a_\mu = (g-2)/2, and the value of the QED coupling at the Z-boson mass, incorporating the new e^+e^- \to \pi\pi data obtained by CMD-2 and KLOE, as well as the corrected SND data, and other improvements. The prediction for a_\mu=11659180.4 (5.1) \times 10^{-10} is about 3 \times 10^{-10} lower than before, and has a smaller uncertainty, which corresponds to a 3.4\sigma deviation from the measured value. The prediction for the QED coupling is \alpha(M_Z^2)^{-1}= 128.937 \pm 0.030.

Item Type: Article LTH 729; arXiv Number: arXiv:hep-ph/0611102v3. Issue Date: 31 May 2007. Available online 16 April 2007. EVEN HIGGS BOSONS; PION FORM-FACTOR; CROSS-SECTIONS; CMD-2 DETECTOR; MSSM; E(+)E(-); PHYSICS; MASSES Q Science > QC Physics Academic Faculties, Institutes and Research Centres > Faculty of Science > Department of Mathematical Sciences 10.1016/j.physletb.2007.04.012 http://arxiv.org/abs/hep-ph/0611102v3 Yes Published 113 07 Aug 2008 15:45 20 May 2011 19:27

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