Higgs boson mass and high-luminosity LHC probes of supersymmetry with vectorlike top quark

TL;DR

This paper explores how adding a vectorlike top quark to the MSSM can increase the Higgs boson mass and reduce superpartner mass requirements, with high-luminosity LHC precision Higgs measurements being key to testing this extension.

Contribution

It demonstrates that a vectorlike top quark extension can significantly raise the Higgs mass and lower superpartner masses, and identifies the high-luminosity LHC as a crucial probe.

Findings

Superpartner masses can be reduced by over three times.

High-luminosity LHC will be the most effective probe through precision Higgs analysis.

The extension helps address the MSSM hierarchy problem.

Abstract

We consider an extension of the MSSM with an added vectorlike top partner. Our aim is to revisit to what extent such an extension can raise the Higgs boson mass through radiative corrections and help ameliorate the MSSM hierarchy problem, and to specify what experimental probes at the LHC will find or exclude this possibility during the high-luminosity phase. Direct detection, precision electroweak and precision Higgs analyses are all commissioned to this end. To achieve the $ 125 \, \textrm{GeV} \ $ Higgs boson mass, we find that superpartner masses can be reduced by a factor of more than three in this scenario compared to the MSSM without the extra vectorlike top quark, and that during the high-luminosity phase of the LHC precision Higgs analysis is expected to become the most powerful experimental probe of the scenario.