Searches for new phenomena in final states with third-generation quarks using the ATLAS detector

Abstract

Many theories beyond the Standard Model (SM) predict new phenomena, such as [Formula: see text] and vector-like quarks, in final states containing bottom- or top-quarks. It is challenging to reconstruct and identify the decay products and model the major background processes. Nevertheless, such final states offer great potential to reduce the SM backgrounds due to their characteristic decay signature. The latest searches in the third-generation quark final states using the full Run-2 proton–proton collision data collected by the ATLAS experiment are presented. Particularly, the recent results of di-bjet and top-antitop resonance searches and dark matter produced in association with a top-quark are discussed in these proceedings. The associated improvements in [Formula: see text]-quark and top-quark identification techniques are also highlighted.