Modelling top partner-vector resonance phenomenology

TL;DR

This paper explores the phenomenology of spin-1 resonances and their interactions with fermionic currents in an $SO(5)$ Composite Higgs model, analyzing production, decay modes, and experimental constraints from LHC data.

Contribution

It provides a detailed analysis of heavy vector resonance production and decay, including the effects of fermion-resonance couplings, and constrains the model using recent LHC searches.

Findings

Couplings significantly affect production rates.

LHC data constrains parameter space.

Impact of fermion-resonance interactions reduces viable regions.

Abstract

We have analysed the observable consequences of the interactions of spin-1 resonances coupled to the invariant fermionic currents that arise in an $SO(5)$ Composite Higgs set-up. The phenomenology entailed by such interactions is thoroughly analysed by studying heavy vector resonances production and decay modes in the viable resonance mass range. Additionally, the production of double and single-composite fermion final states has been scanned along the fermion mass scale. Such production is mediated by the SM gauge and Higgs interactions, and also by charged and neutral vector resonances. The coupling between the new fermions and vector resonances induces a sizeable effect in the production rates. We use the recent 13 TeV LHC searches for vector-like quarks to constrain our parameter space. Specifically, we explore the allowed regions by analysing the decays of a heavy vector-like quark in the $Wb$-channel. We conclude that generically the impact of the couplings between the spin-1 and spin-1/2 resonances will substantially reduce the permitted regions, leading us to test the sensitivity of the parametric dependence in the light of exotic matter interactions.