Constraints on the excitations in the Strongly Coupled Standard Model

TL;DR

This paper investigates the first radial excitations of vector bosons in the Strongly Coupled Standard Model, analyzing their impact on low-energy phenomenology and constraining their couplings through global electroweak fits.

Contribution

It provides the first constraints on the effective couplings of vector boson excitations in the Strongly Coupled Standard Model using a comprehensive global fit.

Findings

Excitations must be weakly coupled to low-energy states

Constraints limit the excitations' influence on electroweak observables

Model remains consistent with current electroweak data

Abstract

The Strongly Coupled Standard Model predicts a rich spectrum of excited states at the Fermi scale. We study the first radial excitations of the vector bosons. The inclusion of these new states affects the low energy phenomenology of the model. We put constraints on the effective couplings by performing a global fit with the electroweak observables, and we find that the excitations have to be rather decoupled from the low-energy states.