$\sqrt{s} =$ ~（13）TeV新现象的包含非共振多轻子探测
Inclusive nonresonant multilepton probes of new phenomena at $\sqrt{s} =$ 13 TeV
摘要：
包含搜索的非共振签名超出标准模型（SM）的事件中的现象与三个或更多的带电轻子，包括强子衰变$τ$轻子，提出。该分析基于与$\sqrt{s} =$ 13 TeV的质子-质子碰撞的138 fb $^{-1}$的积分亮度对应的数据样本，该数据样本由2016-2018年LHC的CMS实验收集。事件分类的基础上轻子和b标记的喷流多重性和各种运动学变量。三个场景的物理超出SM的探测，和信号特定的提升决策树用于提高灵敏度。未观察到与背景预期的显著偏离。对于SM轻子的各种衰变分支分数组合，在845-1065 GeV范围内的III型跷跷板重费米子质量的下限被设定为95%置信水平。对于质量低于1045 GeV和质量范围在125-150 GeV的SM，分别排除了双重和单重矢量$τ$轻子扩展。标量轻夸克只衰变为顶夸克和轻子，在1.12-1.42 TeV以下被排除在外，这取决于轻子的味道。对于III型跷跷板以及矢量样偶极子模型，这些约束是迄今为止最严格的。对于类矢量单态模型，这些是LHC实验的第一个约束。详细的结果也被提出，以方便替代的理论解释。
英文摘要：
An inclusive search for nonresonant signatures of beyond the standard model (SM) phenomena in events with three or more charged leptons, including hadronically decaying $τ$ leptons, is presented. The analysis is based on a data sample corresponding to an integrated luminosity of 138 fb$^{-1}$ of proton-proton collisions at $\sqrt{s} =$ 13 TeV, collected by the CMS experiment at the LHC in 2016-2018. Events are categorized based on the lepton and b-tagged jet multiplicities and various kinematic variables. Three scenarios of physics beyond the SM are probed, and signal-specific boosted decision trees are used for enhancing sensitivity. No significant deviations from the background expectations are observed. Lower limits are set at 95% confidence level on the mass of type-III seesaw heavy fermions in the range 845-1065 GeV for various decay branching fraction combinations to SM leptons. Doublet and singlet vector-like $τ$ lepton extensions of the SM are excluded for masses below 1045 GeV and in the mass range 125-150 GeV, respectively. Scalar leptoquarks decaying exclusively to a top quark and a lepton are excluded below 1.12-1.42 TeV, depending on the lepton flavor. For the type-III seesaw as well as the vector-like doublet model, these constraints are the most stringent to date. For the vector-like singlet model, these are the first constraints from the LHC experiments. Detailed results are also presented to facilitate alternative theoretical interpretations.
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