Search for a Dark Photon with Classifying Anomalies through Outer Density Estimation

The Standard Model (SM) successfully describes fundamental particles but fails to explain dark matter (DM). The Belle II experiment searches for new particles like the dark photon \(A'\) through electron-positron collisions, for example in the process \(e^+e^- \to \gamma A', A' \to \mu^+\mu^-\). This thesis focuses on using the CATHODE method, which trains a classifier on Monte Carlo (MC) simulations to distinguish signal-like anomalies implying dark photons.