Dark Matter searches at ATLAS: tools, recent results and synergies with other experiments

One overarching objective of science is to further our understanding of the universe, from its early stages to its current state and future evolution. This depends on gaining insight on the universe’s most macroscopic components, for example galaxies and stars, as well as describing its smallest components, namely elementary particles and nuclei and their interactions. The apparent excess of "dark matter" in the universe remains one of the outstanding questions in science. If dark matter is a particle, then it can be produced and sought at the Large Hadron Collider, complementing searches in other experiments. This seminar focuses on the searches for dark matter in ATLAS, with a special highlight on the searches that allow to probe dark matter hypotheses that are complementary to other experiments, and the data selection and analysis tools used for these searches. It is clear that solving the dark matter puzzle requires combined expertise from the fields of particle physics, astroparticle physics and nuclear physics. Pursuing common scientific drivers such as dark matter also requires mastering challenges related to instrumentation, data acquisition, selection and analysis, as well as making data and results available to the broader science communities. This seminar also presents the work that various communities and experiments are doing in this direction, and the ongoing initiatives aiming to exploit synergies across different communities