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arXiv 1001.2898hep-ex
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Fermilab Muon(g-2)实验

Status of the Fermilab Muon (g-2) Experiment

B. Lee Roberts

摘要:

费米实验室的新μ子$(g-2)$合作组提出测量μ子的反常磁矩$a_μ$,比布鲁克海文AGS的E821实验好四倍,后者获得了$a_μ= [116 592 089 (63)] \times 10^{-11}$ $\pm 0.54$ ppm。$a_μ$的最后一位数字与公布的数值不同,这是因为μ子与质子的磁矩之比有了新的数值。目前,当用电子正电子湮没数据来确定标准模型贡献的最低阶强子部分时,标准模型值和测量值之间似乎存在$\simeq 3$标准偏差水平的差异。改进的实验,以及在确定强子贡献方面的进一步进展,应该澄清这种差异。由于它有能力限制对LHC发现的解释,无论LHC有什么发现,改进后的测量都将具有重要价值。

英文摘要:

The New Muon $(g-2)$ Collaboration at Fermilab has proposed to measure the anomalous magnetic moment of the muon, $a_μ$, a factor of four better than was done in E821 at the Brookhaven AGS, which obtained $a_μ= [116 592 089 (63)] \times 10^{-11}$ $\pm 0.54$ ppm. The last digit of $a_μ$ is changed from the published value owing to a new value of the ratio of the muon-to-proton magnetic moment that has become available. At present there appears to be a difference between the Standard-Model value and the measured value, at the $\simeq 3$ standard deviation level when electron-positron annihilation data are used to determine the lowest-order hadronic piece of the Standard Model contribution. The improved experiment, along with further advances in the determination of the hadronic contribution, should clarify this difference. Because of its ability to constrain the interpretation of discoveries made at the LHC, the improved measurement will be of significant value, whatever discoveries may come from the LHC.

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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