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arXiv 2601.04763hep-ex
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$\bar{t}tZ$和$\bar{t}t\bar{t}t$在FCC-hh大$Q^2$下的微分测量

Differential measurements of $\bar{t}tZ$ and $\bar{t}t\bar{t}t$ at large $Q^2$ at FCC-hh

Lund University(隆德大学);CERN(欧洲核子研究组织)

Louise Beriet, Matteo Defranchis, Birgit Stapf, Michele Selvaggi

AI总结:

本文研究FCC-hh在质子-质子阶段对顶夸克微分测量,聚焦$\bar{t}tZ$和$\bar{t}t\bar{t}t$过程的轻子终态,分析高$Q^2$区域下的新物理敏感性,并展示高能区的测量精度。

摘要:

本文介绍了在未来圆环对撞机质子-质子阶段(FCC-hh)上对顶夸克测量的研究。分析针对$\bar{t}tZ$和$\bar{t}t\bar{t}t$生产过程的轻子终态。特别关注高$Q^2$区域,其中在有效场论框架中新物理的敏感性增强。数据集对应于$\sqrt{s}=84$ TeV、积分亮度30 $\text{ab}^{-1}$。重构的轻子对$Z_{\ell\ell}$的横向动量分布可测至约2 TeV,高能区($Z_{\ell\ell}$的横向动量>1.8 TeV)的精度为20%。四顶夸克生产标量横向动量$H_T$达到3.5 TeV,精度为35%。此外,针对轻子重建效率的专门研究显示,重新定义隔离变量以考虑FCC-hh中高度提升的对象,可使$\bar{t}tZ$信号产量提高1.5倍。

英文摘要:

This contribution presents studies of differential top-quark measurements at the Future Circular Collider in its proton-proton stage (FCC-hh). The analyses target the leptonic final states of the $\bar{t}tZ$ and $\bar{t}t\bar{t}t$ production processes. Particular focus is given to the high-$Q^2$ regime, where sensitivity to new physics, as encoded in an Effective Field Theory framework, is enhanced. The dataset corresponds to an integrated luminosity of 30 $\text{ab}^{-1}$ at $\sqrt{s} = 84$ TeV. The reconstructed transverse momentum $\text{p}_\text{T}(Z_{\ell\ell})$ distribution is shown to be measurable up to approximately 2 TeV with a precision of 20% in the high energy region ($\text{p}_\text{T}(Z_{\ell\ell})$ >1.8 TeV). The scalar transverse momentum $\text{H}_\text{T}$ of the four-top production reaches 3.5 TeV with a precision of 35%. Additionally, a dedicated study of the lepton reconstruction efficiency shows that redefining the isolation variable to account for the highly boosted objects at FCC-hh improves the total signal yield in $\bar{t}tZ$ by a factor of 1.5.

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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