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arXiv 1012.3886hep-phnucl-th
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μ子g-2中的强子光-光散射:Dyson-Schwinger方程方法

Hadronic light-by-light scattering in the muon g-2: a Dyson-Schwinger equation approach

Tobias Goecke, Christian S. Fischer, Richard Williams

摘要:

在量子色动力学的Dyson-Schwinger方程和Bethe-Salpeter方程的框架下,我们确定了强子光-光散射对μ子反常磁矩的贡献。我们对赝标($π^0, η, η'$)介子交换图的计算结果与以前的计算结果相当。在我们的夸克圈贡献的计算中,我们通过实施规范不变性的约束来改进以前的方法。因此,我们的值$a_μ^{\textrm{LBL;quarkloop}} = (136 \pm 59)\times 10^{-11}$明显更大。从表面上看,这将导致对总$a_μ=116\,591\,891.0(105.0)\times 10^{-11}$的修订估计。

英文摘要:

We determine the hadronic light-by-light scattering contribution to the anomalous magnetic moment of the muon using the framework of Dyson-Schwinger and Bethe-Salpeter equations of QCD. Our result for the pseudoscalar ($π^0, η, η'$) meson exchange diagram is commensurate with previous calculations. In our calculation of the quark loop contribution we improve previous approaches by implementing constraints due to gauge invariance. As a consequence, our value $a_μ^{\textrm{LBL;quarkloop}} = (136 \pm 59)\times 10^{-11}$ is significantly larger. Taken at face value, this then leads to a revised estimate of the total $a_μ=116\,591\,891.0(105.0)\times 10^{-11}$.

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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