Higgs Boson Mass, Sparticle Spectrum and Little Hierarchy Problem in Extended MSSM

TL;DR

This paper explores how adding TeV-scale vectorlike matter to the MSSM can increase the Higgs boson mass up to 160 GeV and alleviate the little hierarchy problem for lighter Higgs masses, while also estimating the sparticle spectrum.

Contribution

It introduces extended MSSM models with vectorlike multiplets that enhance Higgs mass predictions and address the little hierarchy problem.

Findings

Higgs mass can reach up to 160 GeV in extended models.

The little hierarchy problem is less severe for Higgs masses below 125 GeV.

Sparticle spectra are estimated within these extended models.

Abstract

We investigate the impact of TeV-scale matter belonging to complete vectorlike multiplets of unified groups on the lightest Higgs boson in the MSSM. We find that consistent with perturbative unification and electroweak precision data the mass m_h can be as large as 160 GeV. These extended MSSM models can also render the little hierarchy problem less severe, but only for lower values of m_h < 125 GeV. We present estimates for the sparticle mass spectrum in these models.