Electroweak Top Couplings, Partial Compositeness, and Top Partner Searches

Partial top quark compositeness is a crucial aspect of theories with strongelectroweak symmetry breaking. Together with the heavy top partners that liftthe top quark mass to its observed value, these theories predict correlatedmodifications of the top quark's electroweak couplings. Associated measurementstherefore provide direct constraints on the ultraviolet structure of theunderlying hypercolour dynamics. In this paper we employ a minimal version oftop compositeness to discuss how measurements related to the top's electroweakgauge interactions can inform the potential composite nature of the TeV scale.In doing so, we identify the dominant factors that limit the BSM sensitivity.Extrapolating to a future 100 TeV hadron collider, we demonstrate that topquark measurements performed at highest precision can provide complementaryinformation to resonance search by performing a representative resonant toppartner search that specifically targets the correlated resonant electroweaktop partner signatures.