Z′-explorer 2.0: Reconnoitering the dark matter landscape

We introduce version 2.0 of Z'-explorer, a software tool that provides a simple, fast, and user-friendly test of models with an extra U(1) gauge boson (Z') against experimental LHC results. The main novelty of the second version is the inclusion of missing energy searches, as the first version only included final states into SM particles. Hence Z'-explorer 2.0 is able to test dark matter models where the Z' acts as an s-channel mediator between the Standard Model and the dark sector, a widespread benchmark employed by the ATLAS and CMS experimental collaborations. To this end, we perform here the first public reinterpretation of the most recent ATLAS mono-jet search with 139 fb−1. In addition, the corresponding searches in the visible final states have also been updated. We illustrate the power of our code by re-obtaining public plots and also showing novel results. In particular, we study the cases where the Z' couples strongly to top quarks (top-philic), where dark matter couples with a mixture of vector and axial-vector couplings, and also perform a scan in the parameter space of a string inspired Stückelberg model. Z'-explorer 2.0 is publicly available on GitHub.我们推出了Z'-explorer的2.0版本，这是一款可针对大型强子对撞机（Large Hadron Collider, LHC）实验结果，对含额外U(1)规范玻色子（Z'）的物理模型开展操作简便、运行高效且用户友好的测试的软件工具。该版本的核心创新在于纳入了缺失能量搜寻分析，而初代版本仅支持针对标准模型（Standard Model, SM）粒子末态的测试。因此Z'-explorer 2.0可用于检验以Z'作为标准模型与暗物质区之间s道媒介子的暗物质模型——这类模型是ATLAS与CMS实验合作组广泛采用的基准分析框架。为此，我们首次公开重新诠释了最新一期基于139 fb⁻¹积分亮度的ATLAS单喷流搜寻分析。此外，针对可见末态的对应搜寻分析也已完成更新。我们通过复现公开图表并展示全新分析结果，验证了本工具代码的性能。具体而言，我们研究了Z'与顶夸克强耦合的顶夸克亲和型场景、暗物质同时兼具矢量与轴矢量耦合的场景，并对弦理论启发的施特克尔贝格（Stückelberg）模型的参数空间进行了扫描分析。Z'-explorer 2.0已在GitHub平台公开上线。