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引用次数: 0
摘要
τ轻子的反常磁偶极矩(MDM)和电偶极矩(EDM)是标准模型之外新物理学的关键指标。利用方位角不对称作为超外围对撞(UPCs)中的一种新工具,我们在研究这些关键特性时达到了无与伦比的精确度。在相干光子高度线性偏振的驱动下,这种方法独特地使 MDM 和 EDM 都能以相似的量级对 cos 2ϕ 角分布做出贡献。重要的是,我们的方法大大缩小了参数空间,与仅依赖总截面的基于 UPC 的预期测量相比,我们的方法排除了一半以上的参数空间。这种方法不仅提供了更好的约束条件,而且最大限度地减少了对额外理论假设的需求,并为探测放电加工效应提供了一条新途径。
Spin asymmetry and dipole moments in τ-pair production with ultraperipheral heavy ion collisions
The anomalous magnetic (MDM) and electric (EDM) dipole moments of the τ lepton serve as crucial indicators of new physics beyond the standard model. Leveraging azimuthal angular asymmetry as a novel tool in ultraperipheral collisions (UPCs), we attain unparalleled precision in the study of these key properties. Driven by the highly linear polarization of coherent photons, this method uniquely enables both the MDM and EDM to contribute to the cos 2ϕ angular distribution in similar magnitudes. Importantly, our approach substantially narrows the parameter space, excluding more than half of it compared to expected UPC-based measurements reliant solely on the total cross-section. This method not only provides improved constraints but also minimizes the need for additional theoretical assumptions, and offers a novel avenue to probe the EDM effects.
期刊介绍:
Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research.
Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index.
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