Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-01-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
The current status of the experimental measurements and theoretical predictions of the anomalous magnetic moment of the muon $a_\mu$ is briefly reviewed. The emphasis is put on the evaluation of the hadronic contribution to $a_\mu$ as it has the largest uncertainty among all Standard Model contributions. The precision of the hadronic contribution is driven by the input e+e- data predominantly from the \pi+pi- channel. Including the latest experimental data on e+e- annihilation into hadronsfrom CMD2 and SND for the \pi+\pi- channel and BaBar for multihadron final states, the updated Standard Model prediction disagrees with the measurement dominated by BNL by 3.3 standard deviations, with the theoretical precision exceeding the experimental one.
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