A natural SM-like 126 GeV Higgs via non-decoupling D-terms

TL;DR

This paper demonstrates that non-decoupling D-terms in supersymmetric models can naturally produce a 126 GeV Higgs with SM-like couplings without significant fine tuning, and predicts accessible heavy gauge bosons at LHC run II.

Contribution

It introduces non-decoupling D-terms as a solution to the fine tuning problem in achieving a 126 GeV SM-like Higgs in supersymmetric models.

Findings

Non-decoupling D-terms reduce fine tuning in Higgs mass and couplings.

Heavy gauge bosons are predicted to be within LHC run II reach.

Models with non-decoupling D-terms naturally accommodate a 126 GeV Higgs.

Abstract

Accommodating both a 126 GeV mass and Standard Model (SM) like couplings for the Higgs has a fine tuning price in supersymmetric models. Examples are the MSSM, in which SM-like couplings are natural, but raising the Higgs mass up to 126 GeV requires a considerable tuning, or the NMSSM, in which the situation is reversed: the Higgs is naturally heavier, but being SM-like requires some tuning. We show that models with non-decoupling D-terms alleviate this tension - a 126 GeV SM-like Higgs comes out basically with no fine tuning cost. In addition, the analysis of the fine tuning of the extended gauge sector shows that naturalness requires the heavy gauge bosons to likely be within the LHC run II reach.