Dilaton portal in strongly interacting twin Higgs models

TL;DR

This paper explores a strongly interacting twin Higgs model featuring a dilaton as a portal between the Standard Model and twin sectors, with phenomenological implications for future collider experiments.

Contribution

It introduces a holographic twin Higgs model where the dilaton (radion) mediates interactions, providing a new phenomenological probe of the twin Higgs mechanism.

Findings

Most of the natural parameter space can be probed at HL-LHC and HE-LHC.

The dilaton acts as a unique portal between the SM and twin sectors.

The model's phenomenology is determined by a few key parameters.

Abstract

We consider a strongly interacting twin Higgs (SITH) model where an ultraviolet completion of twin Higgs mechanism is realized by a strongly coupled approximately scale invariant theory. Besides the Standard Model (SM) and twin sectors, the low energy effective theory contains a relatively light scalar called a dilaton --- the pseudo Goldstone boson of spontaneously broken scale invariance. The dilaton provides a unique portal between the SM and twin sectors whose phenomenology could provide an important probe of the twin Higgs mechanism. As a concrete example, we consider a holographic twin Higgs model where the role of the dilaton is played by the radion. The phenomenology of this model is fully determined by a few parameters and our analysis concludes that at the HL-LHC (14 TeV) and HE-LHC (27 TeV) with 3000/fb most of the natural parameter space can be probed.