Hadronic Contributions to the Anomalous Magnetic Moment of the Muon

强子对 μ 子反常磁矩的贡献

• 批准号: 201660939
• 负责人: Professor Dr. Christian Fischer
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/201660939?language=en
• 关键词: Hadronic; Contributions; Anomalous; Magnetic; Moment

The anomalous magnetic moment of the muon, αμ, is one of the most precisely determined observables of nature. Today, the experimental value and the theoretical number calculated within the standard model of particle physics disagree by roughly three standard deviations. This discrepancy may signal the exciting possibility of additional theoretical contributions from physics beyond the standard model. To corroborate this possibility it is of tremendous interest to further improve both, the experimental value for αμ and the theoretical prediction. In this project we aim at a significantly refined calculation of the theoretical value obtained within the standard model. Here, hadronic contributions governed by the strong interaction account for most of the uncertainties. In this project we plan to determine these contributions more precisely using a nonperturbative functional approach to the quantum field theory of strong interactions (QCD). The proposed method of Dyson-Schwinger and Bethe-Salpeter equations allows to go well beyond previous model calculations and thus has the potential for a refined calculation with considerably reduced error margins. If successful, our results will be a key element in the precise theoretical determination of αμ and thus provide an important ingredient for precision tests of physics beyond the standard model.

μ子的反常磁矩αμ是自然界中最精确的可观测量之一。今天，在粒子物理学标准模型中计算的实验值和理论值相差大约三个标准偏差。这种差异可能预示着标准模型之外的物理学理论贡献的令人兴奋的可能性。为了证实这种可能性，进一步改进αμ的实验值和理论预测是非常有意义的。在这个项目中，我们的目标是在标准模型中获得的理论值的显着细化计算。在这里，强相互作用的强子贡献占了大部分的不确定性。在这个项目中，我们计划使用强相互作用量子场论（QCD）的非微扰泛函方法来更精确地确定这些贡献。所提出的方法Dyson-Schwinger和Bethe-Salpeter方程允许远远超出以前的模型计算，因此有可能进行精确的计算，大大降低了误差幅度。如果成功的话，我们的结果将是精确理论确定αμ的关键因素，从而为标准模型之外的物理学的精确测试提供重要的成分。