The Standard Model is complete, what's next

Despite its great successes, the Standard Model does not provide answers for several questions that arise both from theoretical arguments and experimental observations. One of the most important established experimental observation that is not described by the Standard Model is the presence of neutrino oscillations, which suggest that the neutrino particles have a non-zero mass. In addition, the Standard Model does not explain several cosmological and astrophysics observations such as the presence of dark matter, the matter anti-matter asymmetry, and the dark energy. On the theoretical side, one can argue that the Standard Model is not an elegant or even a satisfactory theory since it does not provide an explanation to its 19 free parameters and require fine tuning for the theory to be valid at large energy scales. Finally, the Standard Model does not include a quantum theory of gravity. For all these reasons, it is thought that new physics should exist leading to new particles and phenomena. New physics can be probed by direct discoveries of new particles or by measurements that deviate from the Standard Model expectations. This document focuses on Standard Model measurements including observations in the newly discovered Higgs sector. It ends with a technical chapter describing the upgrade of the liquid argon calorimeter of the ATLAS experiment. This upgrade prepares the detector for further new physics searches and a more precise characterisation of the Higgs boson at the run 3 and run 4 of the LHC