Searching for New Physics at the Terascale with the ATLAS Experiment

The ATLAS experiment is a complex detector situated at one of the interaction points of the Large Hadron Collider (LHC), where protons are brought to collide at unprecedented energies. In these collisions, new elementary particles can be produced and studied. The LHC delivered its first groundbreaking result in 2012 with the discovery of the Higgs boson. Since then the accelerator has been upgraded to almost twice the collision energy, and during the Run 2 of the LHC in 2015-2018, it operated at a centre-of-mass energy of 13 TeV.

In this presentation I will discuss a selection of the key results from the ATLAS experiment, both from direct searches for physics beyond the Standard Model and from precision measurements of Standard Model processes. I will also briefly go over what we can expect from the future high-luminosity upgrade of the LHC and possible future colliders that are being looked at in the context of the ongoing update of the European Particle Physics Strategy.