论文标题
在$ \ sqrt {s} = 13 $ tev中，搜索从长寿命中性粒子中搜索一对流离失所的顶点，这些颗粒中有长寿命中性粒子腐烂到pp碰撞中的Atlas Muon光谱仪中的事件
Search for events with a pair of displaced vertices from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at $\sqrt{s}=13$ TeV
论文作者
论文摘要
提出了使用Atlas检测器在LHC上收集的数据对具有两个位移顶点（LLP）对的两个位移顶点的事件。该分析使用$ \ sqrt {s} = 13 $ tev在2015- 2018年记录的质子 - 普罗顿碰撞数据的139〜fb $^{ - 1} $。该搜索采用技术来重建LLP的顶点，以相对于主相互作用顶点，在3 m和14 m之间移动到台频谱仪中的喷气机。观察到的事件数与预期背景和几个基准信号的限制一致。对于质量为125 GEV的希格斯玻色子，该论文报告了将分支分支到低于0.1％的中性长寿命颗粒中的第一个排除限制，而将超过10％的分支分支在95％的置信度下以LLP适当的寿命为95％的置信度，范围为4 cm至72.4 m。此外，本文在Atlas Muon光谱仪中呈现了LLP衰减成$ T \ bar {T} $的第一个结果。
A search for events with two displaced vertices from long-lived particles (LLP) pairs using data collected by the ATLAS detector at the LHC is presented. This analysis uses 139~fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV recorded in 2015-2018. The search employs techniques for reconstructing vertices of LLPs decaying to jets in the muon spectrometer displaced between 3 m 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 into $t\bar{t}$ in the ATLAS muon spectrometer.
