Thesis defense of Philipp Ibis

Precise measurements of CKM matrix parameters to probe the Standard Model of particle physics are a main focus of current flavour-physics experiments. Analyses of B → DD decays allow to assess higher-order Standard Model corrections in these measurements. Two decay-time-dependent measurements of CP violation in different B0 → DD decay modes are presented using data collected by the LHCb experiment. The analysis of B0 → D∗±D∓ decays utilises data corresponding to an integrated luminosity of 9 fb−1 collected at centre-of-mass energies of 7, 8 and 13 TeV. The results of the CP parameters correspond to the most precise measurement in this channel. They are consistent with the previous world average. The analysis of B0 → D+D− decays uses data corresponding to 6 fb−1 collected at 13 TeV. The analysis is ongoing and currently still blind. The evaluated sensitivities show that this will be the most precise measurement of CP violation in this channel.