A search for events with two displaced vertices from long-lived particle (LLP) pairs using data collected by the ATLAS detector at the LHC is presented. This analysis uses $139{\mathrm{fb}}^{-1}$ of proton-proton collision data at $\sqrt{s}=13\mathrm{TeV}$ recorded in 2015–2018. The search employs techniques for reconstructing vertices of LLPs decaying to jets in the muon spectrometer displaced between 3 and 14 m with respect to the primary interaction vertex. The observed numbers of events are consistent with the expected background and limits for several benchmark signals are determined. For the Higgs boson with a mass of 125 GeV, the paper reports the first exclusion limits for branching fractions into neutral long-lived particles below 0.1%, while branching fractions above 10% are excluded at 95% confidence level for LLP proper lifetimes ranging from 4 cm to 72.4 m. In addition, the paper present the first results for the decay of LLPs into $t\overline{t}$ in the ATLAS muon spectrometer.

中文翻译：

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在 ATLAS 介子光谱仪 inppcollisions ats=13TeV 中搜索具有来自长寿命中性粒子衰变为强子射流的一对位移顶点的事件

提出了使用 LHC 上的 ATLAS 探测器收集的数据从长寿命粒子 (LLP) 对中搜索具有两个位移顶点的事件。该分析使用$139{\mathrm{脸书}}^{-1}$质子-质子碰撞数据$\sqrt{s}=13\mathrm{TeV}$记录于 2015-2018 年。该搜索采用了重建 LLP 顶点的技术，这些顶点衰减为 μ 子光谱仪中相对于主要相互作用顶点位移 3 到 14 m 之间的射流。观察到的事件数量与预期背景一致，并确定了几个基准信号的限制。对于质量为 125 GeV 的希格斯玻色子，该论文报告了第一个将分支部分排除在低于 0.1% 的中性长寿命粒子的限制，而在 95% 置信水平下排除了高于 10% 的分支部分，用于 LLP 适当寿命范围从4 厘米至 72.4 米。此外，本文介绍了 LLP 衰减为$吨\overline{吨}$在 ATLAS 介子光谱仪中。