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arXiv 2107.00404hep-ex
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用ATLAS探测器在$pp$ TeV上寻找三轻子或四轻子碰撞中的新现象

Search for new phenomena in three- or four-lepton events in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector

ATLAS Collaboration

摘要:

本文提出了一种在三个或四个轻子事件($3\ell$和$4\ell$,$\ell = e,μ$)中对标准模型以外的物理的最小模型依赖性的搜索方法。该分析旨在同时对广泛的潜在新物理学理论敏感。该分析使用大型强子对撞机以$\sqrt{s} = 13$ TeV的质心能量提供的$pp$碰撞数据,并使用ATLAS探测器记录,对应于139 fb $^{-1}$的完整运行2数据集。$3\ell$和$4\ell$相空间根据事件中轻子的数量、缺少的横动量、轻子的不变质量以及是否存在起源于$Z$ -玻色子候选者的轻子被分为22个事件类别。对这些事件类别进行独立分析,以确定是否存在偏离标准模型的情况。没有观察到与标准模型预测的统计学显著偏差。所有信号区域的上限以可见截面的形式报告。

英文摘要:

A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four leptons ($3\ell$ and $4\ell$, $\ell = e,μ$) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from $pp$ collisions delivered by the Large Hadron Collider at a centre-of-mass energy of $\sqrt{s} = 13$ TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb$^{-1}$. The $3\ell$ and $4\ell$ phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a $Z$-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section.

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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