Search for single and pair production of vector-like quarks with leptonic and hadronic final states in ATLAS

Vector-like quarks (VLQs), hypothetical fermions with identical electroweak representation for left and right chiralities, are telltale signatures of a number of theories that address the naturalness problem of the Higgs boson's mass. This talk reports results from a number of analyses searching for single and pair production of VLQs with 139~$fb^{-1}$ data from $pp$ collisions at $sqrt{s} = 13$~TeV center of mass energy at the ATLAS detector at the LHC. In these results, VLQs are assumed to dominantly interact with the third generation of the standard model quarks alone. These searches look for VLQs in fully hadronic and leptonic final states and present generalized interpretations of statistical limits obtained from them.