| Abstract: The study of kaons has played an important role throughout history in the world of physics by unraveling the mysteries underlying the small differences between matter and antimatter or predicting the charm quark. In this project, we propose the study of short Kaon decays using Run 3 data from LHCb. The decay of Kaons into two or four leptons is heavily suppressed in the Standard Model, and any deviation from the theoretical prediction will imply the discovery of new physics. The LHCb detector has already demonstrated its capability to produce limits on the branching ratio of short Kaon decays using Run 2 data. After the latest detector upgrade in 2022, LHCb started with its Run 3 data taking, where a major difference compared to the previous run was the removal of the hardware trigger. This trigger had a very low efficiency for low transverse momentum particles like the ones produced in Kaon decays. The new detector should have better efficiency, allowing studies of new Kaon decays never made before in LHCb. In this work, we will study the quality of the new data and perform the first LHCb Kaon analysis using Run 3 data. |