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arXiv 2202.07385hep-phhep-ex
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在未来$e^+ e^-$对撞机上电弱精密测量中束流偏振和系统不对称的相互作用

Interplay of Beam Polarisation and Systematic Uncertainties in Electroweak Precision Measurements at Future $e^+ e^-$ Colliders

Jakob Beyer, Jenny List

摘要:

未来的高能$\textrm{e}^+\textrm{e}^-$对撞机将为标准模型提供一些最精确的测试。电弱精密可观测量和三重规范耦合的统计不确定性,预计将改善数量级的电流测量。这为准确评估和最大限度地减少实验系统不确定性的影响提出了新的挑战。光束偏振可能具有独特的潜力来隔离和确定系统效应的大小。到目前为止,研究主要集中在从光束偏振的统计改善。本研究旨在首次评估其对系统不确定性的影响。对2-费米子和4-费米子末态的发生器级微分分布进行了手征费米子耦合和异常三重规范耦合等精确观测量与实验系统效应的组合拟合。不同的配置可用的光束偏振和光度进行了测试,并没有系统的影响,并将讨论在现有的投影费米子和规范玻色子耦合的背景下,从详细的实验模拟。

英文摘要:

Future high-energy $\textrm{e}^+\textrm{e}^-$ colliders will provide some of the most precise tests of the Standard Model. Statistical uncertainties on electroweak precision observables and triple gauge couplings are expected to improve by orders of magnitude over current measurements. This provides a new challenge in accurately assessing and minimizing the impact of experimental systematic uncertainties. Beam polarization may hold a unique potential to isolate and determine the size of systematic effects. So far, studies have mainly focused on the statistical improvements from beam polarisation. This study aims to assess, for the first time, its impact on systematic uncertainties. A combined fit of precision observables, such as chiral fermion couplings and anomalous triple gauge couplings, together with experimental systematic effects is performed on generator-level differential distribution of 2-fermion and 4-fermion final-states. Different configurations of available beam polarisations and luminosities are tested with and without systematic effects, and will be discussed in the context of the existing projections on fermion and gauge boson couplings from detailed experimental simulations.

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