Optimization of the Matching Criteria Between the ATLAS and AFP Detectors at CERN

This thesis is a part of CERN’s ongoing research of the search for axion-like-particle (ALP). It consists of a software to modify existing data to include calculated uncertainties on photon and proton measurements and a software that calculates the difference between correlated and uncorrelated data. Also included is a study on matching criteria for proton-proton interactions with two detected photons. The study discusses the performance of three different matching criteria regarding the kinematics of the di-photon system with at least one detected proton. The created software fulfills all stated requirements, including execution time requirement. The main discovery from the physics point of view is that the interactions studied in the data are caused by pile-up background, thus they are random interactions with no indication of a specific physics process, which is consistent with previous simulations.