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Updated: Sep 13, 2025

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来自格子QCD的Muon g-2的Hadronic真空极化:长距离和全光夸克连接贡献
Alexei Bazavov1, Claude W Bernard2, David A Clarke3
1Michigan State University, Department of Computational Mathematics, Science and Engineering, and Department of Physics and Astronomy, East Lansing, Michigan 48824, USA.
Physical review letters
|July 31, 2025
概括
我们使用晶格量子染色学计算了g-2的光夸克对哈德龙真空极化 (HVP) 的连接贡献. 我们的亚百分比精度结果完善了对子g-2计算的这个关键组件的理解.
科学领域:
- * 高能物理 高能物理
- * * 量子色态动力学 量子色态动力学
- * 子物理学
背景情况:
- * 子异常磁矩 (g-2) 是新物理学的一个敏感探测器.
- * 哈德龙真空极化 (HVP) 是标准模型对子g-2的预测中占主导的理论不确定性.
- * 格子量子染色力学 (LQCD) 是计算HVP贡献的主要工具.
研究的目的:
- * 提出一个新的测定光夸克连接到HVP的长距离窗口的贡献.
- * 为了实现对光夸克连接的HVP贡献总量的亚百分比精度计算.
- *为标准模型对g-2子的评估提供关键的输入.
主要方法:
- *使用MILC的物理质量HISQ组合进行格子QCD计算.
- * 通过 Ω^{-} baryons 质量来确定格子尺度.
- * HVP 的短途,中途和长途窗口的计算贡献.
主要成果:
- * 获得的 a_{μ}^{ll,LD}(conn) = 400.2(4.3) × 10^{-10} 对于长途窗口.
- * 获得了a_{μ}^{ll}(conn) = 655.2(4.5) × 10^{-10} 对于连接光夸克的总HVP贡献,准确度低于百分比.
- *对HVP全额贡献的独立分析之间经过验证的一致性.
结论:
- *光夸克连接的HVP贡献已经以更高的精度计算出来.
- * 结果与独立分析一致,增强了对计算的信心.
- *未来的工作重点是进一步改进HVP计算,以与费米实验室的g-2实验等实验结果的精度相匹配.
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