The Radiative Z2 Breaking Twin Higgs

TL;DR

This paper introduces a novel radiative Z2 symmetry breaking mechanism in twin Higgs models, where the Higgs mass and vacuum misalignment are achieved through radiative corrections, leading to a fully determined Higgs sector.

Contribution

The paper proposes a new spontaneous Z2 breaking mechanism via radiative corrections, with implications for Higgs mass and vacuum structure in twin Higgs models.

Findings

Higgs mass of 125 GeV can be achieved.

Higgs coupling measurements are compatible with the model.

The model predicts eight pseudo-Goldstone bosons.

Abstract

In twin Higgs model, the Higgs boson mass is protected by a $Z_2$ symmetry. The $Z_2$ symmetry needs to be broken either explicitly or spontaneously to obtain misalignment between electroweak and new physics vacua. We propose a novel $Z_2$ breaking mechanism, in which the $Z_2$ is spontaneously broken by radiative corrections to the Higgs potential. Two twin Higgses with different vacua are needed, and vacuum misalignment is realized by opposite but comparable contributions from gauge and Yukawa interactions to the potential. Due to fully radiative symmetry breaking, the Higgs sector is completely determined by twin Higgs vacuum, Yukawa and gauge couplings. There are eight pseudo-Goldstone bosons: the Higgs boson, inert doublet Higgs, and three twin scalars. We show the 125 GeV Higgs mass and constraints from Higgs coupling measurements could be satisfied.