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.
Highlights
Measurements at the Large Hadron Collider (LHC) have explored and constrained a range of ultraviolet (UV) completions of the Standard Model (SM) of Particle Physics
At the present stage of the LHC programme, it is fair to say that unless new light, beyond the Standard Model (BSM) physics is hiding in experimentally challenging signatures, it is either weakly coupled to the SM or there is a considerable mass gap between the SM and the BSM spectrum
In case the SM’s UV completion is both weakly coupled and scale separated to the extent that modifications of the low-energy SM Lagrangian become nonresolvable in the light of expected theoretical and experimental limitations, the effective field theory (EFT) approach will become as challenged as measurements in the full model-context that the EFT can approximate
Summary
Measurements at the Large Hadron Collider (LHC) have explored and constrained a range of ultraviolet (UV) completions of the Standard Model (SM) of Particle Physics. Partial fermion compositeness [14,15,16,17] supplies an additional source of global symmetry breaking through (extended) hypercolor interactions Both effects conspire to an effective low-energy Higgs potential [1,6,7,8,9] of the form. Symmetry breaking ξ > 0 in Eq (2) constrains the LECs α, β ≠ 0, and experimental observations of the Higgs and electroweak bosons imply This limits the parameter range that a realistic theory needs to reproduce. V, we focus on a resonance search in a representative pp → TX; T → tðZ → lþl−Þ final state, where T is the top partner and X is either an additional T or a third generation quark This analysis directly reflects the region where top-partial compositeness leads to new resonant structures as a consequence of modified weak top interactions.
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