论文标题
在带有流离失所的顶点的事件中搜索长寿，大量的颗粒
Search for long-lived, massive particles in events with a displaced vertex and a muon with large impact parameter in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
论文作者
论文摘要
搜索长寿命的颗粒腐烂到哈德子中，并至少提出了一个muon。分析选择通过MUON或缺失的Transverse-Momentum触发的事件，并包含一个位移的Muon轨道和一个位移的顶点。 $ \ sqrt {s} = 13 $ tev的质子 - 普罗顿碰撞数据集与地图集检测器收集，对应于136 fb $^{ - 1} $。该搜索采用专用的重建技术，可显着增加对地图集内探测器中长寿粒子衰减的敏感性。从数据中提取了标准模型过程和仪器效应的背景估计。观察到的事件产量与背景过程中的预期兼容。该结果表示为在标准模型以外的过程中以模型独立的横截面的95％置信度的限制表示，并将其解释为在场景中的排除限制，并成对生产长寿命的顶级壁垒，这些较长的顶级壁垒会通过小$ r $ r $ r $ parity-Parity-Parity-Parity-Parity-Parity-Parity-Pary-Pary-Pary-Partile couplation couplation couplation coupl of to Quark和Muon。最高质量为1.7 TEV的顶级壁垒在0.1 ns的寿命中排除在外，而低于1.3 TEV的质量在0.01 ns和30 ns之间被排除在外。
A search for long-lived particles decaying into hadrons and at least one muon is presented. The analysis selects events that pass a muon or missing-transverse-momentum trigger and contain a displaced muon track and a displaced vertex. The analyzed dataset of proton-proton collisions at $\sqrt{s} = 13$ TeV was collected with the ATLAS detector and corresponds to 136 fb$^{-1}$. The search employs dedicated reconstruction techniques that significantly increase the sensitivity to long-lived particle decays that occur in the ATLAS inner detector. Background estimates for Standard Model processes and instrumental effects are extracted from data. The observed event yields are compatible with those expected from background processes. The results are presented as limits at 95% confidence level on model-independent cross sections for processes beyond the Standard Model, and interpreted as exclusion limits in scenarios with pair-production of long-lived top squarks that decay via a small $R$-parity-violating coupling into a quark and a muon. Top squarks with masses up to 1.7 TeV are excluded for a lifetime of 0.1 ns, and masses below 1.3 TeV are excluded for lifetimes between 0.01 ns and 30 ns.
