Review of recent leading-order hadronic vacuum polarization calculation

Abstract

The leading-order hadronic contribution to the muon magnetic moment anomaly $a_{\mu }\equiv (g_{\mu }-2)/2$, calculated using a dispersion integral of $e^{+}{e}^{-}$ annihilation data and $\tau$ data, is briefly reviewed. This contribution has the largest uncertainty to the predicted value of $a_{\mu }$, which differs from the direct measurement by $\sim 3.6(2.4)$ standard deviations for the $e^{+}{e}^{-}(\tau )$ based analysis. Recent results and main open issues on the subject are discussed.

Comments: 10 pages, 6 figures, Proceedings of Photon 2013. arXiv admin note: text overlap with arXiv:1302.1896