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arXiv 0801.4905hep-ph
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Muon g-2:一个小型的评论

Muon g-2: a mini review

Zhiqing Zhang

摘要:

本文简要评述了μ子$a_μ$反常磁矩的实验测量和理论预言的现状。由于强子对$a_μ$的贡献是所有标准模型贡献中不确定度最大的,因此本文的重点放在强子贡献的评价上。强子贡献的精度主要由π+ π通道的输入e+e-数据驱动。包括了最新的e+e-湮没成强子的实验数据,修正后的标准模型预言与BNL的测量相差3.3个标准差,理论精度超过了实验精度。

英文摘要:

The current status of the experimental measurements and theoretical predictions of the anomalous magnetic moment of the muon $a_μ$ is briefly reviewed. The emphasis is put on the evaluation of the hadronic contribution to $a_μ$ 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 π+pi- channel. Including the latest experimental data on e+e- annihilation into hadronsfrom CMD2 and SND for the π+π- 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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