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arXiv 2408.13191hep-ph
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关于μ子对撞机上混合$Z/γ$部分子分布函数(PDF)的影响

On the impact of the mixed $Z/ γ$ PDF at muon colliders

David Marzocca, Alfredo Stanzione

AI总结:

本研究探究μ子对撞机中$Z/γ$干涉PDF的特性,解析其领头阶抑制与次领头阶解除抑制的机制,并量化其在康普顿散射、希格斯物理及类轴子粒子产生等过程的实验观测潜力。

摘要:

我们研究了$Z/γ$干涉部分子分布函数(PDF,parton distribution function)在高能μ子对撞机中的作用。我们回顾了当电弱相互作用应用于共线分裂过程时该PDF的产生机制,并表明由于一种偶然的抵消,领头阶近似受到显著抑制。然而,这种抑制并未出现在领头对数重求和的数值结果中,在该结果中$Z/γ$ PDF反而与其他电弱规范玻色子的PDF相当。通过将解析近似扩展到次领头阶,我们阐明了这种抑制被解除的机制,并为数值结果提供了更精确的近似。此外,我们探究了$Z/γ$ PDF在未来μ子对撞机若干过程中的影响。高能康普顿散射被认为是有望以高精度实验观测这一特殊电弱效应的过程。我们还量化了$Z/γ$ PDF对希格斯物理的影响,并以新物理为例,量化了其在类轴子粒子(ALP,axion-like particles)共振单产生过程中的影响。

英文摘要:

We study the role of the $Z/γ$-interference parton distribution function (PDF) in high-energy muon colliders. We review how this PDF emerges when electroweak interactions are applied to the collinear splitting process and show that the leading-order approximation is significantly suppressed due to an accidental cancellation. However, this suppression does not appear in the leading-logarithm resummed numerical result, where the $Z/γ$ PDF is instead comparable to those of other electroweak gauge bosons. By extending the analytical approximation to next-to-leading order, we show the mechanism by which the suppression is lifted and provide a more accurate approximation to the numerical result. Furthermore, we explore the impact of the $Z/γ$ PDF in several processes at future muon colliders. High-energy Compton scattering is identified as a promising process for observing experimentally this peculiar electroweak effect with high precision. We also quantify the impact of the $Z/γ$ PDF on Higgs physics and, as a new physics example, in resonant single-production of axion-like particles (ALP).

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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