Neutral-naturalness from a holographic SO(6)/SO(5) composite Higgs model

TL;DR

This paper presents a holographic composite Higgs model with SO(6)/SO(5) symmetry breaking, incorporating neutral twin top partners that mitigate Higgs mass sensitivity, and analyzes its phenomenological implications.

Contribution

It introduces a holographic SO(6)/SO(5) composite Higgs model with a Z2 symmetry for neutral naturalness, and studies the Higgs potential and top partner spectrum.

Findings

Twin top partners raise lightest coloured top-partner masses to ~1500 GeV.

Decay constant remains around 700 GeV without Z2 breaking terms.

Model reproduces observed electroweak boson, Higgs, and top quark masses.

Abstract

We study a holographic realisation of a composite Higgs model with an SO(6)/SO(5) symmetry breaking coset in which the top sector includes colour-neutral twin-partners that reduce the sensitivity of the Higgs mass to the cut-off. Key to this neutral-naturalness mechanism is a Z2 symmetry that leaves the Yukawa couplings to the Higgs boson invariant under an exchange of the top quark and twin top quark, but the symmetry structure of the model means that the Z2 symmetry is not present in the gauge boson couplings to the Higgs. Within the calculable framework of holography we construct and study the Higgs potential. We examine the relation between the Higgs mass, top-partner spectra, and the input parameters, finding that the presence of the twin-partners pushes the masses of the lightest coloured top-partners up to approximately 1500 GeV while the decay constant remains at approximately 700 GeV. Interestingly, no additional Z2 breaking terms are required to reproduce the observed masses of the electroweak gauge bosons, Higgs boson, and top quark.