Higgs Bounds in Three and Four Generation Scenarios

TL;DR

This paper updates bounds on the Higgs boson mass in the Standard Model and MSSM, exploring the impact of a hypothetical fourth fermion generation on these bounds and the viability of MSSM4.

Contribution

It provides new bounds on Higgs masses considering recent data and investigates how a fourth fermion generation affects MSSM viability.

Findings

SM Higgs lower bound exceeds MSSM upper bound in large SUSY parameter space

Adding a fourth generation can reconcile MSSM with experimental bounds

MSSM becomes viable with a fourth fermion generation (MSSM4)

Abstract

In light of recent experimental results, we present updated bounds on the lightest Higgs boson mass in the Standard Model (SM) and in the Minimal Supersymmetric extension of the Standard Model (MSSM). The vacuum stability lower bound on the SM Higgs boson mass lies above the MSSM lightest Higgs boson mass upper bound for a large amount of SUSY parameter space. We postulate a fourth generation of fermions to see how the area of inconsistency changes, and discover that the MSSM is salvagable if a fourth generation is added to the MSSM (MSSM4).