Muons in the final state represent an important signature for many physics studies performed at the Large Hadron Collider (LHC), involving analyses on Standard Model measurements and on new physics searches. An optimized selection of such events requires an efficient and deeply understood muon trigger system. The present work describes the ATLAS muon trigger, consisting of a hardware-based system (Level-1) followed by a software-based reconstruction (High-Level Trigger). To handle the increase of luminosity in Run 2, several upgrades have been implemented to reduce the trigger rate, while still maintaining high values for the efficiency. Such improvements include the request of a coincidence of hits in the muon spectrometer and the hadronic tile calorimeter, an optimised muon isolation and a better estimation of transverse momentum. An overview will be presented on the most recent improvements of the ATLAS muon trigger and on its performance during Run 2. Finally an outlook for the most relevant upgrades planned for Run 3 will be reported.

处于最终状态的介子代表了在大型强子对撞机 (LHC) 上进行的许多物理研究的重要特征，包括对标准模型测量和新物理搜索的分析。此类事件的优化选择需要有效且深入了解的 μ 子触发系统。目前的工作描述了 ATLAS μon 触发器，它由一个基于硬件的系统（Level-1）和一个基于软件的重建（High-Level Trigger）组成。为了处理 Run 2 中亮度的增加，我们实施了多项升级以降低触发率，同时仍保持较高的效率值。这些改进包括要求在 μ 子光谱仪和强子瓦量热仪中重合，优化 μ 子隔离和更好地估计横向动量。