Development of the Detector Control System for the Muon Spectrometer of the ATLAS Experiment and the Z boson Mass measurement

The ATLAS experiment, located at the Large Hadron Collider (LHC) at CERN, is one of the flagship projects of high-energy physics. Its mission is to investigate fundamental questions about the Universe, such as the origin of mass, the nature of dark matter, and potential new physics beyond the Standard Model. This doctora ldissertation presents the development and integration of the Detector Control System (DCS) for the muon spectrometer subsystems of the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. The DCS is a crucial component for ensuring the safe and efficient operation of the detector infrastructure, enabling real-time monitoring, diagnostics, and control of high- and low-voltage systems, cooling stations, and gas modules. Implemented through the WinCC OA SCADA platform within the JCOP framework, the system was successfully extended to legacy and upgraded components, including the MDT, Micromegas, and sTGC technologies.

In parallel, the thesis focuses on the precision measurement of the Z boson mass using reconstructed Z →µ+µ− events. A dedicated data analysis pipeline was developed using Histmaker and Monte Carlo simulations, with careful attention to systematic uncertainties such as sagitta bias. Corrective strategies and advanced fitting techniques (e.g., pseudomass asymmetry and likelihood fits) were applied to obtain an accurate estimation of the Z boson mass, yielding results compatible with the world average. The study not only validates the robustness of the ATLAS detector systems but also contributes to the ongoing verification of the Standard Model.