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arXiv 1107.1497hep-lat
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用动态畴壁费米子确定强子对μ子$g-2$的贡献

Lattice Determination of the Hadronic Contribution to the Muon $g-2$ using Dynamical Domain Wall Fermions

Peter Boyle, Luigi Del Debbio, Eoin Kerrane, James Zanotti

摘要:

本文计算了畴壁费米子动力学模拟2+1味QCD中首阶强子对μ子反常磁矩的贡献。电磁2点函数的RBC-UKQCD格点规范配置上进行评估,这是适合的矢量优势模型的动机的连续形式。我们确定了一种强大而可靠的技术来执行这种拟合,使我们能够从我们的集合中提取最准确的结果。这与非常轻夸克质量的数据相结合,在物理点上产生了a_μ^{(2)had}=641(33)(32)x 10^{-10}的结果,其中第一个不确定性是统计的,第二个是系统学的估计,这与以前的结果一致。我们概述了各种方法,这种计算可以并将得到改善,以竞争的准确性推导出这个数量的实验散射数据的替代技术。

英文摘要:

We present a calculation of the leading order hadronic contribution to the anomalous magnetic moment of the muon for a dynamical simulation of 2+1 flavour QCD using domain wall fermions. The electromagnetic 2-point function is evaluated on the RBC-UKQCD lattice gauge configurations and this is fitted to a continuous form motivated by models of vector dominance. We determine a robust and reliable technique for performing this fit, allowing us to extract the most accurate results possible from our ensembles. This combined with data at very light quark masses produces the result a_μ^{(2)had}=641(33)(32) x 10^{-10} at the physical point, where the first uncertainty is statistical, and the second is an estimate of systematics, which is in agreement with previous results. We outline various methods by which this calculation can and will be improved in order to compete with the accuracy of alternative techniques of deducing this quantity from experimental scattering data.

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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