Prospects of searching for composite resonances at the LHC and beyond

TL;DR

This paper analyzes the collider phenomenology of composite Higgs models, focusing on vector and fermionic resonances, current experimental constraints, and future collider prospects at the HL-LHC, HE-LHC, and 100 TeV colliders.

Contribution

It provides a detailed study of vector and fermionic resonance signatures, including cascade decays, and projects the discovery reach of future colliders within minimal composite Higgs models.

Findings

Current LHC constraints limit resonance masses

Cascade decays enhance detection prospects

Future colliders significantly extend search reach

Abstract

Composite Higgs models predict the existence of resonances. We study in detail the collider phenomenology of both the vector and fermionic resonances, including the possibility of both of them being light and within the reach of the LHC. We present current constraints from di-boson, di-lepton resonance searches and top partner pair searches on a set of simplified benchmark models based on the minimal coset $SO(5)/SO(4)$, and make projections for the reach of the HL-LHC. We find that the cascade decay channels for the vector resonances into top partners, or vice versa, can play an important role in the phenomenology of the models. We present a conservative estimate for their reach by using the same-sign di-lepton final states. As a simple extrapolation of our work, we also present the projected reach at the 27 TeV HE-LHC and a 100 TeV $pp$ collider.