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In this project, part of the 2015 ATLAS data from \sqrt{s} = 13 TeV proton-proton collisions was studied with the TAG Data (TADA) framework. The project also serves as a general introduction to the data analysis tools used in high-energy physics experiments. However, since the TADA data had not yet been reviewed by the ATLAS collaboration, it was omitted in this thesis. It was revealed that some o
