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

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

2006-11-08

arxiv.org/abs/hep-ph/0611102v3

Phys.Lett.B649:173-179,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures. Version to be published in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2007.04.012

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.

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