Search for electroweak production of vector-like leptons in τ-lepton and b-jet final states in pp collisions at s = 13 TeV with the ATLAS detector

A search for pair-production of vector-like leptons is presented, considering their decays into a thirdgeneration Standard Model (SM) quark and a vector leptoquark (U-1) as predicted by an ultraviolet-complete extension of the SM, referred to as the 4321