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arXiv 2501.08407hep-phhep-ex
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新物理对动量依赖的粒子宽度与传播子的影响

Impact of New Physics on Momentum-Dependent Particle Widths and Propagators

Christoph Englert, Wrishik Naskar, Michael Spannowsky

AI总结:

本文利用 Dyson 重求和自能修正,研究 SM 与 SMEFT 中动量依赖宽度及传播子对玻色子和顶夸克的影响,指出未来 μ 子对撞机可借此约束新物理。

摘要:

我们在标准模型(SM)及其 SMEFT 扩展中,研究阈值附近动量依赖的粒子宽度和传播子对规范玻色子、Higgs 玻色子以及顶夸克的影响。通过 Dyson 重求和引入自能修正,我们量化了其相对于固定宽度近似的偏离,并评估了这些偏离对撞机可观测量的意义。Higgs 玻色子所受影响可以忽略,W 玻色子在重建横质量分布中呈现百分比量级的偏离,而顶夸克在其质量阈值附近表现出显著的敏感性。未来的轻子对撞机,例如正负电子对撞机或 μ 子对撞机,可对这些效应提供敏感性,从而约束 SMEFT Wilson 系数。我们针对分阶段建设的未来 μ 子对撞机所提供的精确前沿开展了一项代表性案例研究。结果表明,动量依赖性能在精确时代实验中提供额外敏感性,增强在这些实验中发现新物理的潜力。

英文摘要:

We investigate the impact of momentum-dependent particle widths and propagators on gauge and Higgs bosons and the top quark within the Standard Model (SM) and its SMEFT extensions near thresholds. By incorporating self-energy corrections via Dyson resummation, we quantify deviations from the fixed-width approximation and assess their implications for collider observables. While effects on the Higgs boson are negligible and the $W$ boson shows percent-level deviations in reconstructed transverse mass distributions, the top quark exhibits significant sensitivity near its mass threshold. Future lepton colliders, e.g., electron-positron machines or muon colliders, can offer sensitivity to these effects, enabling constraints on SMEFT Wilson coefficients. We perform a representative case study for the precision frontier available with a staged future muon collider. Our results highlight that momentum dependencies can provide additional sensitivity at precision-era experiments, enhancing the potential for discovering new physics there.

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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