Inverted sfermion mass hierarchy and the Higgs boson mass in the MSSM

TL;DR

This paper explores how an inverted sfermion mass hierarchy in the MSSM naturally leads to maximal stop mixing, a heavy Higgs boson near 125 GeV, and specific superpartner mass predictions, addressing flavor and dark matter issues.

Contribution

It demonstrates that heavy first two generation sfermions induce maximal stop mixing via RG evolution, providing a natural explanation for the Higgs mass and superpartner spectrum in MSSM.

Findings

Higgs boson mass around 125 GeV is naturally achieved.

Lightest stop mass is approximately 0.5 TeV.

Gluino mass is in the 2-3 TeV range.

Abstract

It is shown that MSSM with first two generations of squarks and sleptons much heavier than the third one naturally predicts the maximal stop mixing as a consequence of the RG evolution, with vanishing (or small) trilinear coupling at the high scale. The Higgs boson is generically heavy, in the vicinity of 125 GeV. In this inverted hierarchy scenario, motivated by the supersymmetric FCNC problem and models for fermion masses based on horizontal symmetries, the mass of the lightest stop is O(0.5) TeV and of gluino - O(2-3) TeV. The LSP can be either higgsino or bino or a mixture of both and it can be a good dark matter candidate.