Review of recent leading-order hadronic vacuum polarization calculation

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

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