Optimizing Time-Zero in Germanium Detectors of LEGEND-200

LEGEND-200 is searching for neutrinoless double-beta decay (0νΒΒ) in germanium 76 using high-purity germanium (HPGe) detectors submerged in an active liquid argon veto system. The discovery of 0vΒΒ would prove that the neutrino is a majorana particle (i.e., its own anti-particle) and provide a possible explanation for the imbalance of matter and anti-matter in the universe. Accurate signal start time (t₀​) determination in HPGe detectors is crucial for precise data analysis of events in LEGEND-200. The current t₀​ in HPGe detectors is subject to uncertainties arising from signal propagation effects and electronic noise, among other factors. To improve timing accuracy, the t₀​ provided by the silicon photomultipliers (SiPMs), which exhibits superior timing resolution compared to the HPGe detectors, will be utilized. By comparing the HPGe t₀​ to the SiPM t₀​, the error in the HPGe t₀ measurement can be directly determined. Additionally, other parameters are investigated that are affecting t₀​ in HPGe detectors, including pulse shape, energy, and drift time. Correlating these relationships through statistical analysis can, in later work, improve the precision of LEGEND's analysis parameters used to separate signals from backgrounds.