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arXiv 2510.26698hep-ph
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基于有效场论框架的束缚μ子衰变QED修正

QED corrections to bound-muon decays from an effective-field-theory framework

Institute for Theoretical Physics, Karlsruhe Institute of Technology(卡尔斯鲁厄理工学院理论物理研究所);Brookhaven National Laboratory(布鲁克海文国家实验室)

Duarte Fontes, Robert Szafron

AI总结:

本研究针对核子能标下束缚μ子衰变QED修正计算困难的问题,提出基于有效场论普适性的系统计算框架,给出μ子转换能谱的最精准预测,证实辐射修正使领头阶谱比改变5%,为提升新物理实验发现潜力、衔接高低能可观测量提供了关键支撑。

摘要:

束缚μ子衰变是探索新物理的有力工具,因此对其能谱做出精确理论预测至关重要。尽管QED修正会显著影响能谱形状,但在核子能标以下计算这类修正极具挑战性。通过利用现代有效场论技术的普适性,我们提出了一个框架,可系统计算一大类束缚μ子衰变中的上述修正。作为核心应用,我们给出了μ子转换中信号与背景能谱目前最精准的预测。我们发现,辐射修正会使两类能谱的领头阶比值改变5%,且能量依赖性极弱,这一结果有助于提升即将开展的实验的发现潜力。我们的框架也是连接高能物理与低能可观测量的关键一步,补充了μ子质量能标以上的最新研究进展。

英文摘要:

Bound-muon decays are a powerful probe of new physics, making precise theoretical predictions for their spectra essential. While QED corrections significantly affect the shape of the spectra, their calculation is extremely challenging below the nuclear scale. By exploring the universality of modern effective-field-theory techniques, we present a framework that systematically computes those corrections across a broad class of bound-muon decays. As a key application, we provide the most accurate predictions to date for the signal and background spectra in muon conversion. We show that radiative corrections modify the leading-order ratio of these spectra by $5\%$ with minimal energy dependence, a result relevant for enhancing the discovery reach of upcoming experiments. Our framework also represents a crucial step toward connecting high-energy physics to low-energy observables, complementing recent progress above the muon mass scale.

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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