Study of the performance of the CMS Pixel Luminosity Telescope

The thesis starts out by presenting the experimental framework in which the author worked, with a description of the Large Hadron Collider (LHC) and the Compact Muon Solenoid (CMS) experiment. Secondly, the topic of luminosity is tackled, with an introduction on the theoretical elements at first, then passing on to the description of the luminometers in charge of delivering such measurements for CMS and finally with an explanation of the Van der Meer scan technique and the uncertainties related to it. The Pixel Luminosity Telescope (PLT), one of the CMS luminometers, is then thoroughly described. Finally, a brief analysis of the 2017 PLT performance is presented and discussed.