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Muon g-2 : a mini review

Abstract : 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 hadrons from CMD2 and SND for the $\pi^+\pi^-$ channel and BaBar for multi-hadron 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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Submitted on : Monday, July 16, 2007 - 3:56:40 PM
Last modification on : Wednesday, September 16, 2020 - 4:22:21 PM
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  • HAL Id : in2p3-00163021, version 1



Z. Zhang. Muon g-2 : a mini review. 42nd Rencontres de Moriond Electroweak Interactions and Unified Theories Session, Mar 2007, La Thuile, Italy. pp.457-466. ⟨in2p3-00163021⟩



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