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arXiv 1810.00643hep-ex
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BESIII强子截面的测量

Measurement of Hadronic Cross Sections at BESIII

C. F. Redmer

摘要:

标准模型对μ子反常磁矩预测的不确定性目前完全由强子贡献所支配。最大的贡献是由于强子真空极化。在$e^+e^-$对撞机上测得的强子截面可以作为实验输入来改进计算,利用光学定理。在北京的BESIII实验中,这些截面是用不同的方法确定的。在质心能量高于2 GeV时,可以在能量扫描中测量排他性和包容性截面。另外,可以使用初始状态辐射的方法从$π^+π^-$质量阈值开始确定截面。概述了最近的结果和分析的状态。

英文摘要:

The uncertainties of the Standard Model prediction of the anomalous magnetic moment of the muon are currently completely dominated by hadronic contributions. The largest contribution is due to the hadronic vacuum polarization. Hadronic cross sections measured at $e^+e^-$ colliders can be exploited as experimental input to improve the calculations, making use of the optical theorem. At the BESIII experiment in Beijing these cross sections are determined using different methods. At center-of-mass energies above 2 GeV exclusive and inclusive cross sections can be measured in an energy scan. Additionally, cross sections can be determined starting from the $π^+π^-$ mass threshold using the method of Initial State Radiation. An overview of the recent results and the status of the analyses is provided.

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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