arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1111.0990hep-phnucl-th
收藏

强子对μ子g-2的贡献：Dyson-Schwinger观点

Hadronic contribution to the muon g-2: a Dyson-Schwinger perspective

Tobias Goecke, Christian S. Fischer, Richard Williams

备注：
Contribution to the proceedings of 'International school of nuclear physics, 33rd course', Erice-Sicily: 16 - 24 September 2011
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

我们总结了强子对μ子反常磁矩（$a_μ$）的贡献，强子真空极化（HVP）和光-光散射贡献（LBL）的结果，这些结果是从QCD的Dyson-Schwinger方程（DSE）得到的。在HVP的情况下，我们发现良好的协议与模型无关的测定从色散关系的$a_μ^\mathrm{HVP}$以及阿德勒功能的偏差远低于百分之十的水平。由此我们得出结论，DSE方法应该能够以类似的精度描述$a_μ^\mathrm{LBL}$。我们还提出了使用夸克反夸克T-矩阵的共振展开的LBL的结果。我们的初始值为$a_μ^\mathrm{LBL}=(217 \pm 91) \times 10^{-11}$。

英文摘要：

We summarize our results for hadronic contributions to the anomalous magnetic moment of the muon ($a_μ$), the one from hadronic vacuum-polarisation (HVP) and the light-by-light scattering contribution (LBL), obtained from the Dyson-Schwinger equations (DSE's) of QCD. In the case of HVP we find good agreement with model independent determinations from dispersion relations for $a_μ^\mathrm{HVP}$ as well as for the Adler function with deviations well below the ten percent level. From this we conclude that the DSE approach should be capable of describing $a_μ^\mathrm{LBL}$ with similar accuracy. We also present results for LBL using a resonance expansion of the quark anti-quark T-matrix. Our preliminary value is $a_μ^\mathrm{LBL}=(217 \pm 91) \times 10^{-11}$.

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。

↑