Electroweak Top Couplings, Partial Compositeness and Top Partner Searches

TL;DR

This paper explores how precise measurements of top quark electroweak couplings can reveal signs of partial top compositeness and guide searches for top partners at future high-energy colliders.

Contribution

It introduces a minimal model linking top compositeness to electroweak couplings and analyzes how future 100 TeV collider measurements can complement resonance searches.

Findings

Top electroweak coupling measurements can constrain top compositeness models.

Future colliders can improve sensitivity to top partners through precision electroweak tests.

Correlated signatures between electroweak couplings and resonance searches enhance discovery potential.

Abstract

Partial top quark compositeness is a crucial aspect of theories with strong electroweak symmetry breaking. Together with the heavy top partners that lift the top quark mass to its observed value, these theories predict correlated modifications of the top quark's electroweak couplings. Associated measurements therefore provide direct constraints on the ultraviolet structure of the underlying hypercolour dynamics. In this paper we employ a minimal version of top compositeness to discuss how measurements related to the top's electroweak gauge 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 top quark measurements performed at highest precision can provide complementary information to resonance search by performing a representative resonant top partner search that specifically targets the correlated resonant electroweak top partner signatures.