Radiative corrections to the composite Higgs mass from a gluon partner

TL;DR

This paper calculates how gluon partners affect the Higgs mass in composite models, showing that their contributions can lower the Higgs mass and permit heavier top partners, easing model constraints.

Contribution

It provides the first detailed computation of two-loop radiative corrections to the Higgs mass from gluon partners in a minimal composite Higgs model.

Findings

Gluon partner contributions reduce the Higgs mass.

Heavier top partners become compatible with a 126 GeV Higgs.

Two-loop effects are significant in composite Higgs models.

Abstract

In composite Higgs models light fermionic top partners often play an important role in obtaining a 126 GeV Higgs mass. The presence of these top partners implies that coloured vector mesons, or massive gluon partners, most likely exist. Since the coupling between the top partners and gluon partners can be large there are then sizeable two-loop contributions to the composite Higgs mass. We compute the radiative correction to the Higgs mass from a gluon partner in the minimal composite Higgs model and show that the Higgs mass is in fact reduced. This allows the top partner masses to be increased, easing the tension between having a light composite Higgs and heavy top partners.