Resonance study of SU(2) model with 2 fundamental flavours of fermions

TL;DR

This paper investigates the resonance spectrum, specifically the rho resonance, in a minimal SU(2) composite Higgs model with two fundamental fermion flavors, using lattice simulations to determine its mass and width.

Contribution

It provides the first lattice-based results for the mass and width of the rho resonance in the minimal SU(2) model with two fundamental flavors.

Findings

Determined the rho resonance mass in the model.

Measured the width of the rho resonance.

Mapped the parameter space using improved lattice actions.

Abstract

Composite Higgs models are promising candidate models to address the long-standing naturalness problem in the Standard Model. Among them, the most minimal one is the SU(2) with 2 flavours of fermions in the fundamental representation of the gauge group. An important prediction in these models is the existence of resonance spectrum in vector boson scattering. Here we study the lowest such resonance, which is the equivalent of rho resonance in QCD. We describe the scan of the parameter space using the clover-improved Wilson fermions with Symanzik improved gauge action and then show the first results for the mass and width of the rho resonance in this model.