"$p_{T}^{miss}$ in the AH $1e$ top CR" of "Search for dark matter produced in association with a single top quark or a top quark pair in proton-proton collisions at $ \sqrt{s}=13 $ TeV"

A search for dark matter produced in association with top quarks in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The data set used corresponds to an integrated luminosity of 35.9 fb-1 recorded with the CMS detector at the LHC. Whereas previous searches for neutral scalar or pseudoscalar mediators considered dark matter production in association with a top quark pair only, this analysis also includes production modes with a single top quark. The results are derived from the combination of multiple selection categories that are defined to target either the single top quark or the top quark pair signature. No significant deviations with respect to the standard model predictions are observed. The results are interpreted in the context of a simplified model in which a scalar or pseudoscalar mediator particle couples to a top quark and subsequently decays into dark matter particles. Scalar and pseudoscalar mediator particles with masses below 290 and 300 GeV, respectively, are excluded at 95% confidence level, assuming a dark matter particle mass of 1 GeV and mediator couplings to fermions and dark matter particles equal to unity.本文报道了一项针对13 TeV质心系能量下质子-质子碰撞中伴随顶夸克产生的暗物质的搜寻分析。本次分析使用的数据集为大型强子对撞机（LHC, Large Hadron Collider）上的紧凑缪子线圈（CMS, Compact Muon Solenoid）探测器采集的35.9 fb⁻¹积分亮度数据。相较于过往仅考虑伴随顶夸克对产生暗物质的中性标量或赝标量传递子搜寻工作，本次分析还纳入了单顶夸克相关的产生模式。分析结果源自多类筛选类别的联合统计，这些类别分别针对单顶夸克或顶夸克对的信号特征进行设计。未观测到与标准模型预言存在显著偏离的信号。本次结果基于一个简化模型进行诠释：该模型中，标量或赝标量传递子粒子与顶夸克发生耦合，并随后衰变为暗物质粒子。在暗物质粒子质量为1 GeV，且传递子与费米子及暗物质粒子的耦合强度均为1的假设条件下，质量分别低于290 GeV和300 GeV的标量、赝标量传递子粒子在95%置信水平下被排除。