A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton–proton collision data at a center-of-mass energy of 13\(\,\text {Te}\text {V}\), collected by the CMS experiment at the LHC in 2016–2018, corresponding to an integrated luminosity of 137\(\,\text {fb}^{-1}\). The search uses the decay channels \({\mathrm{Z}} \rightarrow {\mathrm{e}} {\mathrm{e}} \) and \({\mathrm{Z}} \rightarrow {{\upmu }{}{}} {{\upmu }{}{}} \). No significant excess of events is observed over the background expected from the standard model. Limits are set on dark matter particle production in the context of simplified models with vector, axial-vector, scalar, and pseudoscalar mediators, as well as on a two-Higgs-doublet model with an additional pseudoscalar mediator. In addition, limits are provided for spin-dependent and spin-independent scattering cross sections and are compared to those from direct-detection experiments. The results are also interpreted in the context of models of invisible Higgs boson decays, unparticles, and large extra dimensions.

使用具有 Z 玻色子候选和较大的缺失横向动量的事件来搜索暗物质粒子。该分析基于质心能量为 13 \(\,\text {Te}\text {V}\)的质子-质子碰撞数据，由大型强子对撞机 2016-2018 年的 CMS 实验收集，对应于 137 \(\,\text {fb}^{-1}\)的综合光度。搜索使用衰减通道\({\mathrm{Z}} \rightarrow {\mathrm{e}} {\mathrm{e}} \)和\({\mathrm{Z}} \rightarrow {{\upmu } {}{}} {{\upmu }{}{}} \). 没有观察到超出标准模型预期背景的显着过量事件。在具有向量、轴向向量、标量和伪标量介体的简化模型以及具有附加伪标量介体的双希格斯双峰模型的背景下，对暗物质粒子的产生设置了限制。此外，还为自旋相关和自旋无关的散射截面提供了限制，并与直接检测实验的限制进行了比较。这些结果还可以在不可见的希格斯玻色子衰变、非粒子和大额外维度模型的背景下进行解释。