Testing the Scalar Sector of the Twin Higgs Model at Colliders

TL;DR

This paper explores how collider experiments, especially future linear colliders, can test the scalar sector of the Twin Higgs model by studying the radial mode and its implications for the global symmetry structure.

Contribution

It demonstrates that collider measurements of the radial mode, combined with Higgs precision data, can confirm the global symmetry features of the Twin Higgs mechanism.

Findings

LHC has limited reach for the radial mode detection.

Future linear colliders can probe significant parameter space.

Collider data can overdetermine the scalar potential structure.

Abstract

We consider Mirror Twin Higgs models in which the breaking of the global symmetry is realized linearly. In this scenario, the radial mode in the Higgs potential is present in the spectrum, and constitutes a second portal between the twin and SM sectors. We show that a study of the properties of this particle at colliders, when combined with precision measurements of the light Higgs, can be used to overdetermine the form of the scalar potential, thereby confirming that it possesses an enhanced global symmetry as dictated by the Twin Higgs mechanism. We find that, although the reach of the LHC for this state is limited, future linear colliders will be able to explore a significant part of the preferred parameter space, allowing the possibility of directly testing the Twin Higgs framework.